[SOLVED] pic16f72 sinewave inverter with asm codes. not working.

kabeer02 · Apr 7, 2013

jagdeepsingh3@hotmail.it said:
hiiii everybody im thinking to make this inverter i changed the pwm frequency from 3.5Khz to 7.5Khz i attaced the hex code can any one try this code??

second question this is a 500watt designe but i want to convert in to 1000 or 1500 watt (24V) what i have to change?? in the code how can i overload cuttoff setting and increase the load please help

i also have this code for pic16f73 with 7.5Khz pwm frequency and upgraded sine table

Thats very good japdeepsingh, i will try it with my working inverter and see the difference but my major problem was how to edit the code so that it will use on/off switch instead of reset switch ? can someone who has the knowledge of assembly do it please cos i only understand c language.

jagdeepsingh3@hotmail.it · Apr 7, 2013

thanks friend

but this is very high level language very difficult to understand,

when you tested the code please tell us if that code is good

kabeer02 said:
Thats very good japdeepsingh, i will try it with my working inverter and see the difference but my major problem was how to edit the code so that it will use on/off switch instead of reset switch ? can someone who has the knowledge of assembly do it please cos i only understand c language.

kabeer02 · Apr 9, 2013

yes the code work but it goes off after 5second and come on again vice- vasa...

jagdeepsingh3@hotmail.it · Apr 9, 2013

on proteus works fine it is strange :/

kabeer02 · Apr 9, 2013

I think a very small modification has to be made but what and what the you edit in the previous code,i have a friend who has knowledge on ASM language may be he can help.

jagdeepsingh3@hotmail.it · Apr 10, 2013

here you are pic18f452 with lcd interface inverter code:

Code:

'****************************************************************
'*  Name    :                                      *
'*  Author  :                                       *
'*  Notice  :         *
'*          :                               *
'*  Date    :                                        *
'*  Version :                                               *
'*  Notes   : Uses a PIC18F452. Outputs MOSFET DRIVE THROUGH    *                
'*          ' HWPM + CD4081 FOR CHANNEL CONTROL.                *
'*          ' LOOKUP TABLE FOR SINE                             *
'*          ' INTERRUPT FOR 1)CURRENT LIMIT,2)MOS-DRIVE,3) UPS MODE
'*          :                                                   *
'****************************************************************
                                  '
    DEFINE OSC 40                 'USES A 10MHz CRYSTAL IN x4 PLL MODE FOR 40MHz CLOCK
    DEFINE USE_LFSR 1             'Makes some code shorter
'*******************************************************************************
' Define interrupt handler        '
    DEFINE INTHAND myint          '
                                  '
'********* LCD PORT DEFINITIONS ************************************************

    DEFINE LCD_DREG PORTD         ' Set LCD Data port PORTD
    DEFINE LCD_DBIT 0             ' Set starting Data bit (0 or 4) if 4-bit bus i.e, PortD.0-PORTD.3
    DEFINE LCD_RSREG PORTC        ' Set LCD Register Select PORTC
    DEFINE LCD_RSBIT 5            ' Set LCD Register Select bit i.e, PORTC.5
    DEFINE LCD_EREG PORTC         ' Set LCD Enable port
    DEFINE LCD_EBIT 4             ' Set LCD Enable bit i.e, PORTC.4
    DEFINE LCD_BITS 4             ' Set LCD bus size to 8 bits
    DEFINE LCD_LINES 2            ' Set number of lines on LCD to 4 Lines
    DEFINE LCD_COMMANDUS 2000     ' Set command delay time in us
    DEFINE LCD_DATAUS 50          ' Set data delay time in us
    
'Variables for saving state in interrupt handler *******************************
wsave           VAR BYTE bankA system   ' Saves W
ssave           VAR BYTE bankA system   ' Saves STATUS
fsave           VAR WORD bankA system   ' Saves FSR0
'///////////////////////////////////////////////////////////////////////////////
DEAD            VAR BIT  bankA system   ' SET FOR DEAD TIME SETTING CLEARED EVERY ZERO-CROSS
TIM0INT         VAR BIT  bankA system   ' TIMER0 INTERRUPT CLEARED WHEN IT OCCURS
SYNCOK          VAR BIT  bankA system   ' SET WHEN SYNCHRONIZED TO MAIN
AC              VAR BIT  bankA system   ' SET WHEN AC IS AVAILABLE
PHASE           VAR BIT  bankA system   ' DRIVE PHASE (DETERMINE WHICH CYCLE)
OVERCURRENT     VAR BIT  bankA system   ' SET WHEN AN OVERLOAD INTERRUPT OCCURS
ADCINT          VAR BIT  bankA system   ' SET WHEN AD CONVERSION HAS FINISHED (RESET AT INT)
INTVAL          VAR WORD bankA system   ' PWM UPDATE INTERRUPT (ADJUSTED TO LOCK TO AC)
INDEX           VAR BYTE bankA system   ' SINE-TABLE INDEX POINTER
PWMVAL          VAR BYTE bankA system   ' PWMVALUE FOR FIRING
TEMP            VAR WORD                ' TEMPORARY VARIABLE

    MOS1        VAR PORTC.0             ' MOSFET CHANNEL-1 GATE DRIVE
    MOS2        VAR PORTC.1             ' MOSFET CHANNEL-2 GATE DRIVE
    PULSE       VAR PORTC.2             ' MODULATING PWM OUTPUT (32KHz, SINE-TABLED)
    LCDLAMP     VAR PORTC.3             ' CONTROLS THE LCD BACKLIGHT - 0=ON,1=OFF
    RELAY       VAR PORTD.4             ' TRANSFER RELAY + INDICATION
    BUZZER      VAR PORTD.5             ' AUDIO ANNUNCIATION
    FAULT       VAR PORTD.6             ' FAULT INDICATION
    LOCKED      VAR PORTD.7             ' SYNC-LOCK TO AC INDICATION
    
    OVERLOAD    VAR PORTB.0             ' MOSFET OVERLAOD INPUT / IMMEDIATE SHUTDOWN
    FAIL        VAR PORTB.1             ' AC-FAIL INPUT (FROM16F676)
    SYNC        VAR PORTB.2             ' AC-MAINS SYNC INPUT
    STANDBY     VAR PORTB.3             ' STANDBY/OFF SWITCH (INVERTER-MODE)
    TRICKLE     VAR PORTB.4             ' SWITCHES-OFF THE BATTERY CHARGER
    MENU        VAR PORTB.5             ' MENU-BUTTON
    INCR        VAR PORTB.6             ' INCREASE-BUTTON
    DECR        VAR PORTB.7             ' DECREASE-BUTTON
    
    TP1         VAR PORTE.0             ' TEST POINT 1 FOR OSCILLOSCOPE CHECK
    TP2         VAR PORTE.1             ' TEST POINT 2 FOR OSCILLOSCOPE CHECK
    HEARTBEAT   VAR PORTE.2             ' HEART-BEAT LED
      
'******PORT DATA DIRECTIONS ****************************************************
    LATC     = 0                        ' CLEAR THE PORTC DATA LATCHES
    TRISC    = %10000000                ' SET PORTC DIRECTIONS
    PORTC    = 0                        ' MAKE-SURE THAT THE MOSFETS ARE TURNED-OFF
    TRISA    = %00111111
    
    
    TRISD    = %00000000                ' PORTD DATA DIRECTIONS (ALL OUTPUTS)
    PORTD    = 0                        ' TURN-ON BACKLIGHT AND OTHERS OFF
    TRISB    = %11101111                ' SET PORTB DIRECTIONS
    PORTB.4  = 0                        ' TURN-OFF CHARGER
    TRISE    = %00000000                ' PORTE DATA DIRECTIONS (ALL-OUTPUTS)
    PORTB    = 0                        ' TURN-OFF HEARTBEAT AND TEST POINTS
    ADCON0   = %10000000                ' RIGHT JUSTIFY,FOSC/64
    ADCON1   = %11000010                ' FOSC/64, PORTE DIGITAL

'*******************************************************************************

GOTO STARTUP ' SKIP AROUND THE INTERRUPT HANDLER    
    
' ***Assembly language INTERRUPT handler****************************************
Asm
myint

; Save the state of critical registers
        movwf   wsave              ; Save W
        swapf   STATUS, W          ; Swap STATUS to W (swap avoids changing STATUS)
        clrf    STATUS             ; Clear STATUS
        movwf   ssave              ; Save swapped STATUS

; Save the FSR value because it gets changed below  
        movf    Low FSR0, W        ; Move FSR0 lowbyte to W
        movwf   fsave              ; Save FSR0 lowbyte
        movf    High FSR0, W       ; Move FSR0 highbyte to W
        movwf   fsave+1            ; Save FSR0 highbyte
; CHECK IF OVERLOAD OCCURED i,e., PORTB.0 INTERUPTED (FIRST PRIORITY)
        btfss   INTCON, INT0IF     ; CHECK IF OVERLOAD OCCURED
        GoTo    CHECKAC
; TURN-OFF THE GATE DRIVES (PORTC.0&PORTC.1) RETAINING OTHER BITS (PULSE BY PULSE LIMIT)
        MOVLW   0xFC               ; MOVE '11111100
        ANDWF   PORTC,1            ; ADD W WITH PORTC AND PLACE IN PORTC
        bcf     INTCON, INT0IF     ; CLEAR THE HARDWARE INTERRUPT FLAG PORTB.0
        bsf     OVERCURRENT        ; SET THE SOFTWARE OVERLOAD FLAG
; CHECK IF THE AC-FAILED i,e., IF PORTB.1 INTERRUPTED  
CHECKAC
        btfss   INTCON3, INT1IF    ; CHECK IF AC-FAILED OCCURED
        GoTo    AC_SYNC            ; IF AC DID NOT FAILED THEN SKIP AND CHECK FOR TIMER0
        bsf     PORTD, 4           ; TURN-ON THE TRANSFER RELAY
        bcf     INTCON3, INT1IF    ; CLEAR THE AC-FAIL INTERRUPT FLAG
        bcf     AC                 ; CLEAR THE AC FLAG
        bcf     SYNCOK             ; CLEAR THE SYNCHRONIZED FLAG        
        bcf     INTCON3, INT1IE    ; DISABLE FURTHER AC-CHECK INTERRUPTS
        bcf     INTCON3, INT2IE    ; DISABLE FURTHER SYNC INTERRUPT

; SYNCHRONIZE THE AC-FREE RUNNING TIMER
AC_SYNC        
        btfss   INTCON3, INT2IF    ; CHECK IF AC-FAILED OCCURED
        GoTo    TIMEKEEP           ; IF AC-SYNC DID NOT OCCUR THEN SKIP AND CHECK FOR TIMER0
        bcf     INTCON3, INT2IF    ; CLEAR THE INT2 HARDWARE FLAG
        MOVLW   0x0                ; MOVE ZERO TO THE WORKING REGISTER
        MOVWF   TMR1H              ; RESET TMR1H
        MOVWF   TMR1L              ; RESET TMR1L
; CHECK FOR TIMER0 INTERRUPT EVERY 312.5uS      
TIMEKEEP

        btfss   INTCON, TMR0IF     ; TEST IF T0 OVERFLOWED
        GoTo    FINISHED           ; SKIP IF SET
        BTG     PORTC, 3           ; TOGGLE THE LCDLAMP FOR SCOPE CHECK
        MOVLW   0xFC               ; MOVE '11111100
        ANDWF   PORTC,1            ; ADD W WITH PORTC AND PLACE IN PORTC
        movff   INTVAL+1,TMR0H     ; MOVE THE HIGH VALUE TO W REG 
        movff   INTVAL,  TMR0L     ; MOVE THE LOW VALUE TO W REG 
        bcf     TIM0INT            ; CLEAR THE TIM0INT SOFTWARE FLAG
        bcf     INTCON, TMR0IF     ; CLEAR THE TIMER0 INT HARDWARE FLAG
        bcf     ADCINT             ; CLEAR THE ADC INTERRUPT FLAG
        incf    INDEX, 1           ; INCREMENT INDEX
        movf    INDEX, W           ;
        sublw   .32                ; Substract INDEX FROM 32
        btfss   STATUS,Z
        GoTo    FINISHED           ; SKIP PHASE CHANGE (INDEX RESET)
        clrf    INDEX              ; CLEAR THE INDEX
        btg     PHASE              ; TOGGLE THE PHASE
; Restore FSR, PCLATH, STATUS and W registers
FINISHED 
        movf    fsave, W           ; retrieve FSR0 lowbyte value
        movwf   Low FSR0           ; Restore it to FSR0 lowbyte
        movf    fsave+1, W         ; retrieve FSR0 highbyte value
        movwf   High FSR0          ; Restore it to FSR0 highbyte
        swapf   ssave, W           ; Retrieve the swapped STATUS value (swap to avoid changing STATUS)
        movwf   STATUS             ; Restore it to STATUS
        swapf   wsave,  F          ; Swap the stored W value
        swapf   wsave,  W          ; Restore it to W (swap to avoid changing STATUS)
        retfie                     ; Return from the interrupt
EndAsm
'///////////////////////////////////////////////////////////////////////////////    

'///////////////////////////////////////////////////////////////////////////////

    
STARTUP:
LCDOUT $FE, 1 :PAUSE 100          ' CLEAR AND INITIALIZE THE LCD
LCDOUT "ANDIG INVERTER"           ' DISPLAY MESSAGE


'***PWM SETUP //////////////////////////////////////////////////////////////////    
    PR2     = $FF          ' SET THE PWM PERIOD TO 255}
    T2CON   = %00000100    ' PRESCALE=1, TIMER2 0N    } YIELDS A 39KHz PWM
    CCPR1L  = 0            ' SET THE DUTY CYCLE INITIALLY TO 0
    CCP1CON = %00001100    ' CONFIGURE AND START AS PWM
'***END OF PWM SETUP ///////////////////////////////////////////////////////////

'* TIMER ZERO SETUP/////////////////////////////////////////////////////////////
T0CON  = %00001000         ' NO-PRESCALE , 16BIT, OFF AT THIS MOMENT
TMR0H = $FF                ' LOAD THE HIGH BYTE
TMR0L = $CA                ' LOAD THE LOW BYTE
'* END OF TIMER ZERO SETUP//////////////////////////////////////////////////////

'** SET UP THE INTERRUPTS///////////////////////////////////////////////////////
INTCON  = %00110000 ' TMR0 = 1, INT0 = 1 , PIE = 0, GIE=0 AT THIS MOMENT,
INTCON2 = %00000000 ' PULLUP = 1,OVERLOAD=AC-FAIL=SYNC=FALLING EDGE
INTCON3 = %00000000 '%00011000 ' INT1=INT2=1, LOW PRIORITY (NOW NOT ENABLED)
'** END OF SET UP OF THE INTERRUPTS/////////////////////////////////////////////

'** SET UP TIMER1 FOR AC-SYCN COUNTING (FREE-RUNNING) 
                     ' THIS VALUE IS ADJUSTED ONLY DURING SYNCHRONIZE PHASE
INTCON.7 = 1         ' ENABLE GLOBAL INTERRUPT
T0CON.7  = 1         ' START TIMER 0


FIRE:
TEMP = TMR0L                    ' NEEDED FOR THE SIMULATOR TO UPDATE TMR0H 
IF TIM0INT = 0 THEN             ' IF A FRESH FIRING IS NEEDED THEN
   TIM0INT = 1                  ' SET THE SOFTWARE INT FIRING FLAG
    
    LOOKUP INDEX, [0,25,50,74,98,120,142,162,180,197,212,_ ' GET THE PWMVALUE
    225,235,244,250,254,255,254,250,244,235,_
    225,212,197,180,162,142,120,98,74,50,25],PWMVAL
    
    CCPR1L = PWMVAL             ' LOAD THE PWMVAL TO THE HWPWM
         IF PHASE = 0 THEN      ' FIRE THE MOSFETS ACCORDING TO THE PHASE VALUE
             MOS1 = TIM0INT     ' FIRE USING SAFETY LOGIC
             ELSE               ' EITHER CHANNEL 1 OR CHANNEL 2 (DEPENDS ON PHASE)
             MOS2 = TIM0INT     ' FIRING USING SAFETY LOGIC
         ENDIF

ENDIF
GOTO FIRE

kabeer02 · Apr 10, 2013

please can you compile it and send the code with the circuit diagram if possible?

pnjbtr · Apr 11, 2013

I think a very small modification has to be made but what and what the you edit in the previous code,

Code:

LEVEL_86	movf 0x21,w
	call table	
	movwf 0x50
	movf 0x3E,w
	movwf 0x51
	call LEVEL_88	
	bcf STATUS,C
	rrf 0x53,f
	rrf 0x52,f
	bcf STATUS,C
	rrf 0x53,f
	rrf 0x52,f
	bcf STATUS,C
	rrf 0x53,f
	rrf 0x52,f
	bcf STATUS,C
	rrf 0x53,f
	rrf 0x52,f
	movf 0x52,w
	movwf 0x24
	movf 0x53,w
	movwf 0x25
	bcf STATUS,C
	movf 0x24,w
	[COLOR="#FF0000"]sublw .200;pwm khz[/COLOR][SIZE=3][/SIZE]
	movwf 0x28
	movf 0x25,w
	movwf W_TEMP
	btfss STATUS,C

We can change pwm frequency in level 86.

unhappy · Apr 12, 2013

jagdeepsingh3@hotmail.it said:

here you are pic18f452 with lcd interface inverter code:

Code:

'****************************************************************
'*  Name    :                                      *
'*  Author  :                                       *
'*  Notice  :         *
'*          :                               *
'*  Date    :                                        *
'*  Version :                                               *
'*  Notes   : Uses a PIC18F452. Outputs MOSFET DRIVE THROUGH    *                
'*          ' HWPM + CD4081 FOR CHANNEL CONTROL.                *
'*          ' LOOKUP TABLE FOR SINE                             *
'*          ' INTERRUPT FOR 1)CURRENT LIMIT,2)MOS-DRIVE,3) UPS MODE
'*          :                                                   *
'****************************************************************
                                  '
    DEFINE OSC 40                 'USES A 10MHz CRYSTAL IN x4 PLL MODE FOR 40MHz CLOCK
    DEFINE USE_LFSR 1             'Makes some code shorter
'*******************************************************************************
' Define interrupt handler        '
    DEFINE INTHAND myint          '
                                  '
'********* LCD PORT DEFINITIONS ************************************************

    DEFINE LCD_DREG PORTD         ' Set LCD Data port PORTD
    DEFINE LCD_DBIT 0             ' Set starting Data bit (0 or 4) if 4-bit bus i.e, PortD.0-PORTD.3
    DEFINE LCD_RSREG PORTC        ' Set LCD Register Select PORTC
    DEFINE LCD_RSBIT 5            ' Set LCD Register Select bit i.e, PORTC.5
    DEFINE LCD_EREG PORTC         ' Set LCD Enable port
    DEFINE LCD_EBIT 4             ' Set LCD Enable bit i.e, PORTC.4
    DEFINE LCD_BITS 4             ' Set LCD bus size to 8 bits
    DEFINE LCD_LINES 2            ' Set number of lines on LCD to 4 Lines
    DEFINE LCD_COMMANDUS 2000     ' Set command delay time in us
    DEFINE LCD_DATAUS 50          ' Set data delay time in us
    
'Variables for saving state in interrupt handler *******************************
wsave           VAR BYTE bankA system   ' Saves W
ssave           VAR BYTE bankA system   ' Saves STATUS
fsave           VAR WORD bankA system   ' Saves FSR0
'///////////////////////////////////////////////////////////////////////////////
DEAD            VAR BIT  bankA system   ' SET FOR DEAD TIME SETTING CLEARED EVERY ZERO-CROSS
TIM0INT         VAR BIT  bankA system   ' TIMER0 INTERRUPT CLEARED WHEN IT OCCURS
SYNCOK          VAR BIT  bankA system   ' SET WHEN SYNCHRONIZED TO MAIN
AC              VAR BIT  bankA system   ' SET WHEN AC IS AVAILABLE
PHASE           VAR BIT  bankA system   ' DRIVE PHASE (DETERMINE WHICH CYCLE)
OVERCURRENT     VAR BIT  bankA system   ' SET WHEN AN OVERLOAD INTERRUPT OCCURS
ADCINT          VAR BIT  bankA system   ' SET WHEN AD CONVERSION HAS FINISHED (RESET AT INT)
INTVAL          VAR WORD bankA system   ' PWM UPDATE INTERRUPT (ADJUSTED TO LOCK TO AC)
INDEX           VAR BYTE bankA system   ' SINE-TABLE INDEX POINTER
PWMVAL          VAR BYTE bankA system   ' PWMVALUE FOR FIRING
TEMP            VAR WORD                ' TEMPORARY VARIABLE

    MOS1        VAR PORTC.0             ' MOSFET CHANNEL-1 GATE DRIVE
    MOS2        VAR PORTC.1             ' MOSFET CHANNEL-2 GATE DRIVE
    PULSE       VAR PORTC.2             ' MODULATING PWM OUTPUT (32KHz, SINE-TABLED)
    LCDLAMP     VAR PORTC.3             ' CONTROLS THE LCD BACKLIGHT - 0=ON,1=OFF
    RELAY       VAR PORTD.4             ' TRANSFER RELAY + INDICATION
    BUZZER      VAR PORTD.5             ' AUDIO ANNUNCIATION
    FAULT       VAR PORTD.6             ' FAULT INDICATION
    LOCKED      VAR PORTD.7             ' SYNC-LOCK TO AC INDICATION
    
    OVERLOAD    VAR PORTB.0             ' MOSFET OVERLAOD INPUT / IMMEDIATE SHUTDOWN
    FAIL        VAR PORTB.1             ' AC-FAIL INPUT (FROM16F676)
    SYNC        VAR PORTB.2             ' AC-MAINS SYNC INPUT
    STANDBY     VAR PORTB.3             ' STANDBY/OFF SWITCH (INVERTER-MODE)
    TRICKLE     VAR PORTB.4             ' SWITCHES-OFF THE BATTERY CHARGER
    MENU        VAR PORTB.5             ' MENU-BUTTON
    INCR        VAR PORTB.6             ' INCREASE-BUTTON
    DECR        VAR PORTB.7             ' DECREASE-BUTTON
    
    TP1         VAR PORTE.0             ' TEST POINT 1 FOR OSCILLOSCOPE CHECK
    TP2         VAR PORTE.1             ' TEST POINT 2 FOR OSCILLOSCOPE CHECK
    HEARTBEAT   VAR PORTE.2             ' HEART-BEAT LED
      
'******PORT DATA DIRECTIONS ****************************************************
    LATC     = 0                        ' CLEAR THE PORTC DATA LATCHES
    TRISC    = %10000000                ' SET PORTC DIRECTIONS
    PORTC    = 0                        ' MAKE-SURE THAT THE MOSFETS ARE TURNED-OFF
    TRISA    = %00111111
    
    
    TRISD    = %00000000                ' PORTD DATA DIRECTIONS (ALL OUTPUTS)
    PORTD    = 0                        ' TURN-ON BACKLIGHT AND OTHERS OFF
    TRISB    = %11101111                ' SET PORTB DIRECTIONS
    PORTB.4  = 0                        ' TURN-OFF CHARGER
    TRISE    = %00000000                ' PORTE DATA DIRECTIONS (ALL-OUTPUTS)
    PORTB    = 0                        ' TURN-OFF HEARTBEAT AND TEST POINTS
    ADCON0   = %10000000                ' RIGHT JUSTIFY,FOSC/64
    ADCON1   = %11000010                ' FOSC/64, PORTE DIGITAL

'*******************************************************************************

GOTO STARTUP ' SKIP AROUND THE INTERRUPT HANDLER    
    
' ***Assembly language INTERRUPT handler****************************************
Asm
myint

; Save the state of critical registers
        movwf   wsave              ; Save W
        swapf   STATUS, W          ; Swap STATUS to W (swap avoids changing STATUS)
        clrf    STATUS             ; Clear STATUS
        movwf   ssave              ; Save swapped STATUS

; Save the FSR value because it gets changed below  
        movf    Low FSR0, W        ; Move FSR0 lowbyte to W
        movwf   fsave              ; Save FSR0 lowbyte
        movf    High FSR0, W       ; Move FSR0 highbyte to W
        movwf   fsave+1            ; Save FSR0 highbyte
; CHECK IF OVERLOAD OCCURED i,e., PORTB.0 INTERUPTED (FIRST PRIORITY)
        btfss   INTCON, INT0IF     ; CHECK IF OVERLOAD OCCURED
        GoTo    CHECKAC
; TURN-OFF THE GATE DRIVES (PORTC.0&PORTC.1) RETAINING OTHER BITS (PULSE BY PULSE LIMIT)
        MOVLW   0xFC               ; MOVE '11111100
        ANDWF   PORTC,1            ; ADD W WITH PORTC AND PLACE IN PORTC
        bcf     INTCON, INT0IF     ; CLEAR THE HARDWARE INTERRUPT FLAG PORTB.0
        bsf     OVERCURRENT        ; SET THE SOFTWARE OVERLOAD FLAG
; CHECK IF THE AC-FAILED i,e., IF PORTB.1 INTERRUPTED  
CHECKAC
        btfss   INTCON3, INT1IF    ; CHECK IF AC-FAILED OCCURED
        GoTo    AC_SYNC            ; IF AC DID NOT FAILED THEN SKIP AND CHECK FOR TIMER0
        bsf     PORTD, 4           ; TURN-ON THE TRANSFER RELAY
        bcf     INTCON3, INT1IF    ; CLEAR THE AC-FAIL INTERRUPT FLAG
        bcf     AC                 ; CLEAR THE AC FLAG
        bcf     SYNCOK             ; CLEAR THE SYNCHRONIZED FLAG        
        bcf     INTCON3, INT1IE    ; DISABLE FURTHER AC-CHECK INTERRUPTS
        bcf     INTCON3, INT2IE    ; DISABLE FURTHER SYNC INTERRUPT

; SYNCHRONIZE THE AC-FREE RUNNING TIMER
AC_SYNC        
        btfss   INTCON3, INT2IF    ; CHECK IF AC-FAILED OCCURED
        GoTo    TIMEKEEP           ; IF AC-SYNC DID NOT OCCUR THEN SKIP AND CHECK FOR TIMER0
        bcf     INTCON3, INT2IF    ; CLEAR THE INT2 HARDWARE FLAG
        MOVLW   0x0                ; MOVE ZERO TO THE WORKING REGISTER
        MOVWF   TMR1H              ; RESET TMR1H
        MOVWF   TMR1L              ; RESET TMR1L
; CHECK FOR TIMER0 INTERRUPT EVERY 312.5uS      
TIMEKEEP

        btfss   INTCON, TMR0IF     ; TEST IF T0 OVERFLOWED
        GoTo    FINISHED           ; SKIP IF SET
        BTG     PORTC, 3           ; TOGGLE THE LCDLAMP FOR SCOPE CHECK
        MOVLW   0xFC               ; MOVE '11111100
        ANDWF   PORTC,1            ; ADD W WITH PORTC AND PLACE IN PORTC
        movff   INTVAL+1,TMR0H     ; MOVE THE HIGH VALUE TO W REG 
        movff   INTVAL,  TMR0L     ; MOVE THE LOW VALUE TO W REG 
        bcf     TIM0INT            ; CLEAR THE TIM0INT SOFTWARE FLAG
        bcf     INTCON, TMR0IF     ; CLEAR THE TIMER0 INT HARDWARE FLAG
        bcf     ADCINT             ; CLEAR THE ADC INTERRUPT FLAG
        incf    INDEX, 1           ; INCREMENT INDEX
        movf    INDEX, W           ;
        sublw   .32                ; Substract INDEX FROM 32
        btfss   STATUS,Z
        GoTo    FINISHED           ; SKIP PHASE CHANGE (INDEX RESET)
        clrf    INDEX              ; CLEAR THE INDEX
        btg     PHASE              ; TOGGLE THE PHASE
; Restore FSR, PCLATH, STATUS and W registers
FINISHED 
        movf    fsave, W           ; retrieve FSR0 lowbyte value
        movwf   Low FSR0           ; Restore it to FSR0 lowbyte
        movf    fsave+1, W         ; retrieve FSR0 highbyte value
        movwf   High FSR0          ; Restore it to FSR0 highbyte
        swapf   ssave, W           ; Retrieve the swapped STATUS value (swap to avoid changing STATUS)
        movwf   STATUS             ; Restore it to STATUS
        swapf   wsave,  F          ; Swap the stored W value
        swapf   wsave,  W          ; Restore it to W (swap to avoid changing STATUS)
        retfie                     ; Return from the interrupt
EndAsm
'///////////////////////////////////////////////////////////////////////////////    

'///////////////////////////////////////////////////////////////////////////////

    
STARTUP:
LCDOUT $FE, 1 :PAUSE 100          ' CLEAR AND INITIALIZE THE LCD
LCDOUT "ANDIG INVERTER"           ' DISPLAY MESSAGE


'***PWM SETUP //////////////////////////////////////////////////////////////////    
    PR2     = $FF          ' SET THE PWM PERIOD TO 255}
    T2CON   = %00000100    ' PRESCALE=1, TIMER2 0N    } YIELDS A 39KHz PWM
    CCPR1L  = 0            ' SET THE DUTY CYCLE INITIALLY TO 0
    CCP1CON = %00001100    ' CONFIGURE AND START AS PWM
'***END OF PWM SETUP ///////////////////////////////////////////////////////////

'* TIMER ZERO SETUP/////////////////////////////////////////////////////////////
T0CON  = %00001000         ' NO-PRESCALE , 16BIT, OFF AT THIS MOMENT
TMR0H = $FF                ' LOAD THE HIGH BYTE
TMR0L = $CA                ' LOAD THE LOW BYTE
'* END OF TIMER ZERO SETUP//////////////////////////////////////////////////////

'** SET UP THE INTERRUPTS///////////////////////////////////////////////////////
INTCON  = %00110000 ' TMR0 = 1, INT0 = 1 , PIE = 0, GIE=0 AT THIS MOMENT,
INTCON2 = %00000000 ' PULLUP = 1,OVERLOAD=AC-FAIL=SYNC=FALLING EDGE
INTCON3 = %00000000 '%00011000 ' INT1=INT2=1, LOW PRIORITY (NOW NOT ENABLED)
'** END OF SET UP OF THE INTERRUPTS/////////////////////////////////////////////

'** SET UP TIMER1 FOR AC-SYCN COUNTING (FREE-RUNNING) 
                     ' THIS VALUE IS ADJUSTED ONLY DURING SYNCHRONIZE PHASE
INTCON.7 = 1         ' ENABLE GLOBAL INTERRUPT
T0CON.7  = 1         ' START TIMER 0


FIRE:
TEMP = TMR0L                    ' NEEDED FOR THE SIMULATOR TO UPDATE TMR0H 
IF TIM0INT = 0 THEN             ' IF A FRESH FIRING IS NEEDED THEN
   TIM0INT = 1                  ' SET THE SOFTWARE INT FIRING FLAG
    
    LOOKUP INDEX, [0,25,50,74,98,120,142,162,180,197,212,_ ' GET THE PWMVALUE
    225,235,244,250,254,255,254,250,244,235,_
    225,212,197,180,162,142,120,98,74,50,25],PWMVAL
    
    CCPR1L = PWMVAL             ' LOAD THE PWMVAL TO THE HWPWM
         IF PHASE = 0 THEN      ' FIRE THE MOSFETS ACCORDING TO THE PHASE VALUE
             MOS1 = TIM0INT     ' FIRE USING SAFETY LOGIC
             ELSE               ' EITHER CHANNEL 1 OR CHANNEL 2 (DEPENDS ON PHASE)
             MOS2 = TIM0INT     ' FIRING USING SAFETY LOGIC
         ENDIF

ENDIF
GOTO FIRE

Dear Jagdeep Singh
nice post but give complete project that is with schematic and transformer data:?:

jagdeepsingh3@hotmail.it · Apr 12, 2013

hiii all for now i have this code soon im going to upload the circuit

kabeer02 · Apr 13, 2013

That will be very helpful jf you send the complete circuit diagram and the hex

OBIALOR · Apr 17, 2013

Jagdeepsingh you are not the author of this source file, you can get it at picbasic forum stop promising what you can not do,,,the author do no attached the schematic of this code.

jagdeepsingh3@hotmail.it · Apr 17, 2013

OBIALOR said:
Jagdeepsingh you are not the author of this source file, you can get it at picbasic forum stop promising what you can not do,,,the author do no attached the schematic of this code.

i dont said this is my code!!! i downloaded this long time go with schematic but now i dont have schematic because i have lost it

- - - Updated - - -

you can use this schematic with littel modifications

kabeer02 · Apr 17, 2013

jagdeepsingh3@hotmail.it said:

here you are pic18f452 with lcd interface inverter code:

Code:

'****************************************************************
'*  Name    :                                      *
'*  Author  :                                       *
'*  Notice  :         *
'*          :                               *i can see that you really want to help others Mr jagdeepsingh but the code uses lcd while the pdf doesn't can you search for the original diagram please.
'*  Date    :                                        *
'*  Version :                                               *
'*  Notes   : Uses a PIC18F452. Outputs MOSFET DRIVE THROUGH    *                
'*          ' HWPM + CD4081 FOR CHANNEL CONTROL.                *
'*          ' LOOKUP TABLE FOR SINE                             *
'*          ' INTERRUPT FOR 1)CURRENT LIMIT,2)MOS-DRIVE,3) UPS MODE
'*          :                                                   *
'****************************************************************
                                  '
    DEFINE OSC 40                 'USES A 10MHz CRYSTAL IN x4 PLL MODE FOR 40MHz CLOCK
    DEFINE USE_LFSR 1             'Makes some code shorter
'*******************************************************************************
' Define interrupt handler        '
    DEFINE INTHAND myint          '
                                  '
'********* LCD PORT DEFINITIONS ************************************************

    DEFINE LCD_DREG PORTD         ' Set LCD Data port PORTD
    DEFINE LCD_DBIT 0             ' Set starting Data bit (0 or 4) if 4-bit bus i.e, PortD.0-PORTD.3
    DEFINE LCD_RSREG PORTC        ' Set LCD Register Select PORTC
    DEFINE LCD_RSBIT 5            ' Set LCD Register Select bit i.e, PORTC.5
    DEFINE LCD_EREG PORTC         ' Set LCD Enable port
    DEFINE LCD_EBIT 4             ' Set LCD Enable bit i.e, PORTC.4
    DEFINE LCD_BITS 4             ' Set LCD bus size to 8 bits
    DEFINE LCD_LINES 2            ' Set number of lines on LCD to 4 Lines
    DEFINE LCD_COMMANDUS 2000     ' Set command delay time in us
    DEFINE LCD_DATAUS 50          ' Set data delay time in us
    
'Variables for saving state in interrupt handler *******************************
wsave           VAR BYTE bankA system   ' Saves W
ssave           VAR BYTE bankA system   ' Saves STATUS
fsave           VAR WORD bankA system   ' Saves FSR0
'///////////////////////////////////////////////////////////////////////////////
DEAD            VAR BIT  bankA system   ' SET FOR DEAD TIME SETTING CLEARED EVERY ZERO-CROSS
TIM0INT         VAR BIT  bankA system   ' TIMER0 INTERRUPT CLEARED WHEN IT OCCURS
SYNCOK          VAR BIT  bankA system   ' SET WHEN SYNCHRONIZED TO MAIN
AC              VAR BIT  bankA system   ' SET WHEN AC IS AVAILABLE
PHASE           VAR BIT  bankA system   ' DRIVE PHASE (DETERMINE WHICH CYCLE)
OVERCURRENT     VAR BIT  bankA system   ' SET WHEN AN OVERLOAD INTERRUPT OCCURS
ADCINT          VAR BIT  bankA system   ' SET WHEN AD CONVERSION HAS FINISHED (RESET AT INT)
INTVAL          VAR WORD bankA system   ' PWM UPDATE INTERRUPT (ADJUSTED TO LOCK TO AC)
INDEX           VAR BYTE bankA system   ' SINE-TABLE INDEX POINTER
PWMVAL          VAR BYTE bankA system   ' PWMVALUE FOR FIRING
TEMP            VAR WORD                ' TEMPORARY VARIABLE

    MOS1        VAR PORTC.0             ' MOSFET CHANNEL-1 GATE DRIVE
    MOS2        VAR PORTC.1             ' MOSFET CHANNEL-2 GATE DRIVE
    PULSE       VAR PORTC.2             ' MODULATING PWM OUTPUT (32KHz, SINE-TABLED)
    LCDLAMP     VAR PORTC.3             ' CONTROLS THE LCD BACKLIGHT - 0=ON,1=OFF
    RELAY       VAR PORTD.4             ' TRANSFER RELAY + INDICATION
    BUZZER      VAR PORTD.5             ' AUDIO ANNUNCIATION
    FAULT       VAR PORTD.6             ' FAULT INDICATION
    LOCKED      VAR PORTD.7             ' SYNC-LOCK TO AC INDICATION
    
    OVERLOAD    VAR PORTB.0             ' MOSFET OVERLAOD INPUT / IMMEDIATE SHUTDOWN
    FAIL        VAR PORTB.1             ' AC-FAIL INPUT (FROM16F676)
    SYNC        VAR PORTB.2             ' AC-MAINS SYNC INPUT
    STANDBY     VAR PORTB.3             ' STANDBY/OFF SWITCH (INVERTER-MODE)
    TRICKLE     VAR PORTB.4             ' SWITCHES-OFF THE BATTERY CHARGER
    MENU        VAR PORTB.5             ' MENU-BUTTON
    INCR        VAR PORTB.6             ' INCREASE-BUTTON
    DECR        VAR PORTB.7             ' DECREASE-BUTTON
    
    TP1         VAR PORTE.0             ' TEST POINT 1 FOR OSCILLOSCOPE CHECK
    TP2         VAR PORTE.1             ' TEST POINT 2 FOR OSCILLOSCOPE CHECK
    HEARTBEAT   VAR PORTE.2             ' HEART-BEAT LED
      
'******PORT DATA DIRECTIONS ****************************************************
    LATC     = 0                        ' CLEAR THE PORTC DATA LATCHES
    TRISC    = %10000000                ' SET PORTC DIRECTIONS
    PORTC    = 0                        ' MAKE-SURE THAT THE MOSFETS ARE TURNED-OFF
    TRISA    = %00111111
    
    
    TRISD    = %00000000                ' PORTD DATA DIRECTIONS (ALL OUTPUTS)
    PORTD    = 0                        ' TURN-ON BACKLIGHT AND OTHERS OFF
    TRISB    = %11101111                ' SET PORTB DIRECTIONS
    PORTB.4  = 0                        ' TURN-OFF CHARGER
    TRISE    = %00000000                ' PORTE DATA DIRECTIONS (ALL-OUTPUTS)
    PORTB    = 0                        ' TURN-OFF HEARTBEAT AND TEST POINTS
    ADCON0   = %10000000                ' RIGHT JUSTIFY,FOSC/64
    ADCON1   = %11000010                ' FOSC/64, PORTE DIGITAL

'*******************************************************************************

GOTO STARTUP ' SKIP AROUND THE INTERRUPT HANDLER    
    
' ***Assembly language INTERRUPT handler****************************************
Asm
myint

; Save the state of critical registers
        movwf   wsave              ; Save W
        swapf   STATUS, W          ; Swap STATUS to W (swap avoids changing STATUS)
        clrf    STATUS             ; Clear STATUS
        movwf   ssave              ; Save swapped STATUS

; Save the FSR value because it gets changed below  
        movf    Low FSR0, W        ; Move FSR0 lowbyte to W
        movwf   fsave              ; Save FSR0 lowbyte
        movf    High FSR0, W       ; Move FSR0 highbyte to W
        movwf   fsave+1            ; Save FSR0 highbyte
; CHECK IF OVERLOAD OCCURED i,e., PORTB.0 INTERUPTED (FIRST PRIORITY)
        btfss   INTCON, INT0IF     ; CHECK IF OVERLOAD OCCURED
        GoTo    CHECKAC
; TURN-OFF THE GATE DRIVES (PORTC.0&PORTC.1) RETAINING OTHER BITS (PULSE BY PULSE LIMIT)
        MOVLW   0xFC               ; MOVE '11111100
        ANDWF   PORTC,1            ; ADD W WITH PORTC AND PLACE IN PORTC
        bcf     INTCON, INT0IF     ; CLEAR THE HARDWARE INTERRUPT FLAG PORTB.0
        bsf     OVERCURRENT        ; SET THE SOFTWARE OVERLOAD FLAG
; CHECK IF THE AC-FAILED i,e., IF PORTB.1 INTERRUPTED  
CHECKAC
        btfss   INTCON3, INT1IF    ; CHECK IF AC-FAILED OCCURED
        GoTo    AC_SYNC            ; IF AC DID NOT FAILED THEN SKIP AND CHECK FOR TIMER0
        bsf     PORTD, 4           ; TURN-ON THE TRANSFER RELAY
        bcf     INTCON3, INT1IF    ; CLEAR THE AC-FAIL INTERRUPT FLAG
        bcf     AC                 ; CLEAR THE AC FLAG
        bcf     SYNCOK             ; CLEAR THE SYNCHRONIZED FLAG        
        bcf     INTCON3, INT1IE    ; DISABLE FURTHER AC-CHECK INTERRUPTS
        bcf     INTCON3, INT2IE    ; DISABLE FURTHER SYNC INTERRUPT

; SYNCHRONIZE THE AC-FREE RUNNING TIMER
AC_SYNC        
        btfss   INTCON3, INT2IF    ; CHECK IF AC-FAILED OCCURED
        GoTo    TIMEKEEP           ; IF AC-SYNC DID NOT OCCUR THEN SKIP AND CHECK FOR TIMER0
        bcf     INTCON3, INT2IF    ; CLEAR THE INT2 HARDWARE FLAG
        MOVLW   0x0                ; MOVE ZERO TO THE WORKING REGISTER
        MOVWF   TMR1H              ; RESET TMR1H
        MOVWF   TMR1L              ; RESET TMR1L
; CHECK FOR TIMER0 INTERRUPT EVERY 312.5uS      
TIMEKEEP

        btfss   INTCON, TMR0IF     ; TEST IF T0 OVERFLOWED
        GoTo    FINISHED           ; SKIP IF SET
        BTG     PORTC, 3           ; TOGGLE THE LCDLAMP FOR SCOPE CHECK
        MOVLW   0xFC               ; MOVE '11111100
        ANDWF   PORTC,1            ; ADD W WITH PORTC AND PLACE IN PORTC
        movff   INTVAL+1,TMR0H     ; MOVE THE HIGH VALUE TO W REG 
        movff   INTVAL,  TMR0L     ; MOVE THE LOW VALUE TO W REG 
        bcf     TIM0INT            ; CLEAR THE TIM0INT SOFTWARE FLAG
        bcf     INTCON, TMR0IF     ; CLEAR THE TIMER0 INT HARDWARE FLAG
        bcf     ADCINT             ; CLEAR THE ADC INTERRUPT FLAG
        incf    INDEX, 1           ; INCREMENT INDEX
        movf    INDEX, W           ;
        sublw   .32                ; Substract INDEX FROM 32
        btfss   STATUS,Z
        GoTo    FINISHED           ; SKIP PHASE CHANGE (INDEX RESET)
        clrf    INDEX              ; CLEAR THE INDEX
        btg     PHASE              ; TOGGLE THE PHASE
; Restore FSR, PCLATH, STATUS and W registers
FINISHED 
        movf    fsave, W           ; retrieve FSR0 lowbyte value
        movwf   Low FSR0           ; Restore it to FSR0 lowbyte
        movf    fsave+1, W         ; retrieve FSR0 highbyte value
        movwf   High FSR0          ; Restore it to FSR0 highbyte
        swapf   ssave, W           ; Retrieve the swapped STATUS value (swap to avoid changing STATUS)
        movwf   STATUS             ; Restore it to STATUS
        swapf   wsave,  F          ; Swap the stored W value
        swapf   wsave,  W          ; Restore it to W (swap to avoid changing STATUS)
        retfie                     ; Return from the interrupt
EndAsm
'///////////////////////////////////////////////////////////////////////////////    

'///////////////////////////////////////////////////////////////////////////////

    
STARTUP:
LCDOUT $FE, 1 :PAUSE 100          ' CLEAR AND INITIALIZE THE LCD
LCDOUT "ANDIG INVERTER"           ' DISPLAY MESSAGE


'***PWM SETUP //////////////////////////////////////////////////////////////////    
    PR2     = $FF          ' SET THE PWM PERIOD TO 255}
    T2CON   = %00000100    ' PRESCALE=1, TIMER2 0N    } YIELDS A 39KHz PWM
    CCPR1L  = 0            ' SET THE DUTY CYCLE INITIALLY TO 0
    CCP1CON = %00001100    ' CONFIGURE AND START AS PWM
'***END OF PWM SETUP ///////////////////////////////////////////////////////////

'* TIMER ZERO SETUP/////////////////////////////////////////////////////////////
T0CON  = %00001000         ' NO-PRESCALE , 16BIT, OFF AT THIS MOMENT
TMR0H = $FF                ' LOAD THE HIGH BYTE
TMR0L = $CA                ' LOAD THE LOW BYTE
'* END OF TIMER ZERO SETUP//////////////////////////////////////////////////////

'** SET UP THE INTERRUPTS///////////////////////////////////////////////////////
INTCON  = %00110000 ' TMR0 = 1, INT0 = 1 , PIE = 0, GIE=0 AT THIS MOMENT,
INTCON2 = %00000000 ' PULLUP = 1,OVERLOAD=AC-FAIL=SYNC=FALLING EDGE
INTCON3 = %00000000 '%00011000 ' INT1=INT2=1, LOW PRIORITY (NOW NOT ENABLED)
'** END OF SET UP OF THE INTERRUPTS/////////////////////////////////////////////

'** SET UP TIMER1 FOR AC-SYCN COUNTING (FREE-RUNNING) 
                     ' THIS VALUE IS ADJUSTED ONLY DURING SYNCHRONIZE PHASE
INTCON.7 = 1         ' ENABLE GLOBAL INTERRUPT
T0CON.7  = 1         ' START TIMER 0


FIRE:
TEMP = TMR0L                    ' NEEDED FOR THE SIMULATOR TO UPDATE TMR0H 
IF TIM0INT = 0 THEN             ' IF A FRESH FIRING IS NEEDED THEN
   TIM0INT = 1                  ' SET THE SOFTWARE INT FIRING FLAG
    
    LOOKUP INDEX, [0,25,50,74,98,120,142,162,180,197,212,_ ' GET THE PWMVALUE
    225,235,244,250,254,255,254,250,244,235,_
    225,212,197,180,162,142,120,98,74,50,25],PWMVAL
    
    CCPR1L = PWMVAL             ' LOAD THE PWMVAL TO THE HWPWM
         IF PHASE = 0 THEN      ' FIRE THE MOSFETS ACCORDING TO THE PHASE VALUE
             MOS1 = TIM0INT     ' FIRE USING SAFETY LOGIC
             ELSE               ' EITHER CHANNEL 1 OR CHANNEL 2 (DEPENDS ON PHASE)
             MOS2 = TIM0INT     ' FIRING USING SAFETY LOGIC
         ENDIF

ENDIF
GOTO FIRE

I can see that Mr jagdeepsingh is ready to help others and that essence of edaboard forum but the code he provide uses lcd while the pdf he upload doesn't use lcd ,can he please search for the original diagram of the giving code please i think it will really help.

- - - Updated - - -

jagdeepsingh3@hotmail.it said:

here you are pic18f452 with lcd interface inverter code:

Code:

'****************************************************************
'*  Name    :                                      *
'*  Author  :                                       *
'*  Notice  :         *
'*          :                               *i can see that you really want to help others Mr jagdeepsingh but the code uses lcd while the pdf doesn't can you search for the original diagram please.

OBIALOR · Apr 19, 2013

Really he is doing his best,even if he can provide the hex file or the source code for the schematics he send it will be fine.

RONY CHAKRABORTY · Apr 20, 2013

Dear jagdeep, the code listing given by you was created by Saugata in melabes forum. if you share somebodies instinctual property please share his name also. This is some kind of showing respect to the Author, who shared hid hard work with everybody without any interest.
I have designed some professional inverters with the help of Saugata and Other friends, which is available now in Bangladesh market. Check here https://www.ekushebangla.com/technologies.html
Ill try to share one LCD based design with all here with the permission of Other authors.
Thanks every Body

kabeer02 · Apr 20, 2013

we will be happy if you can share with us rony.

andig · Apr 20, 2013

RONY CHAKRABORTY said:
Ill try to share one LCD based design with all here with the permission of Other authors.
Thanks every Body

Just like Rony, I have been thinking of making at least one of my design complete open source. But always de-motivated by my clients, who fear that making sinewave inverter open source will make them lose business. If you can Rony I don't mind. BTW Rony is a very capable programmer. Keep up the good work Rony.

The codes is asm in the above post are actually disassembled version of the original code and thus do not have Branch Labels or Variable defines. If it runs as it is then it might be okay to build one, but tweaking is restricted. The PBP(PicBasic Pro) code published in the melabs forum is just for idea and far from a complete inverter dealt way back. You can find the whole thread here : https://www.picbasic.co.uk/forum/showthread.php?t=1846

BTW I should mention it was not a commercial success due to high price of PIC18F. It was later ported to VF control for motor drives. But I can guarantee that PBP with ASM interrupts can make a inverter with PIC16F73 with LCD display and Menu based settings stored in 24C04.It handles voltage modulation cycle by cycle with bitshift software multiply in the ISR giving good output regulation. But for dynamic regulation (for mixed inductive load) a dsPIC is a wiser choice.
I am not into inverters much currently and hardly get time to visit forums but I respect all the enthusiast community out there. The community helped me build my design and I hope sooner or later I would be able to pay back.

Regards to ALL
-Sougata
Kolkata, India

OBIALOR · Apr 20, 2013

Thank you Sougata i have followed your write up at picbasic forum some year back, i will be happy if you and Rony give us good inverter here.Thank you

- - - Updated - - -

professortata · Apr 22, 2013

Re: sine wave inverter schematic

inetgobi said:
hi everypost, please post your sinewave ups related doupts!!

Dear inetgobi
Can you please help me with the complete schematic of a pic16f72 based pure sinewave inverter?
Prof.Somayaji Tata

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[SOLVED] pic16f72 sinewave inverter with asm codes. not working.

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