Pic 16f876a Pure Sinewave inverter

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marcony

Joined: 12 May 2007
Posts: 5

12 May 2007 23:03 pwm inverter

dose any one help me to find a project DIY about 12vdc/220vac PWM inverter based on pic

barmak

Joined: 28 Apr 2007
Posts: 69
Helped: 2

16 May 2007 13:43 pwm sine wave inverter

what do u mean by pic but any how AVRs has got different types of PWMs u can work with

barmak

Joined: 28 Apr 2007
Posts: 69
Helped: 2

22 May 2007 10:16 pwm inverter circuit

i recieved your email please do not spam my mail and about your problem i should say that AVR pwm's are 5 v not 30 v if you need a 30 v PWM u can use amplifier or u can find what u want ready and made in communication specialized ic's

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

09 Jun 2007 11:31 pic inverter

Hi,
i made my own sine-wave inverter with PIC16F876A,
here is a circuit and source code (for CCS PCWH):
http://www.4shared.com/dir/2136086/3afe23e/sharing.html

saeed_pk

Joined: 20 May 2006
Posts: 199
Helped: 5
Location: Islamabad, Pakistan

10 Jun 2007 23:20 pic based inverter

Will u please tell
which Duty cycle i have to generate and how to apply to all four transistor( Full bridge inverter)
what should be the scheme for giving PWM to transistors please help

rajudp

Joined: 27 May 2006
Posts: 238
Helped: 10
Location: India

23 Jun 2007 5:16 pwm inverter schematic

i cannot able to download the circuit. can u please mail it to rajud_p(at)yahoo.com

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

07 Aug 2007 22:43 pic pwm inverter

PIC sine-wave inverters circuit and software, here:
http://mihd.net/qf94no
Very Happy

adnali

Joined: 24 Mar 2008
Posts: 7

27 Mar 2008 16:18 sine pwm inverter

hi and salam to all
i think its not working anyone can try it please tell me i,m very thanks full to u

servocontroller

Joined: 16 Dec 2007
Posts: 5

06 Apr 2008 14:50 inverter pwm

Thanks for the schematic and the code for the UPS but it seems to be very difficult to understan

king_cobraz_77

Joined: 06 Mar 2006
Posts: 18
Helped: 1

27 Apr 2008 16:13 pure sine wave inverter circuit

complex to understand

baonguyenpro

Joined: 13 Oct 2006
Posts: 63
Helped: 2

28 Apr 2008 7:17 inverter pic

It's a new concept. Please give more detail about what you are expecting

servocontroller

Joined: 16 Dec 2007
Posts: 5

04 May 2008 15:59 pic16f876 sine wave inverter

Mr Taner

Will you please explain your design a little bit?

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

21 May 2008 20:26 pwm inverter circuits

My design is a sine-wave stand-alone PWM voltage-source inverter (Not UPS)
with PIC16F876A MCU, with parameters: Uin=12V DC, Uo=230V AC, 50Hz, P=500W.
Inverter have an integrated input under/over voltage protection, output voltage regulation, output current protection and overtemperature protection.
Output voltage is a pure sine-wave, generated with built-in PWM module of PIC MCU,
with frequency 20Khz.
Very Happy

Faizan Jawaid

Joined: 17 Jul 2008
Posts: 195
Helped: 17
Location: Karachi, Pakistan

18 Jul 2008 20:31 pwm based inverter

First u hav to undrstnd how inverters work. First convert a 12VDC to 220VDC using flyback converter. The use PIC builtin PWM function to drive thyristors(SCRs) and generate a square or a sine wave. That wave will be your 220VAC. But u have to study alot to make an Inverter. Go for a book " High Frequency Switching Power Supplies"

kib

Joined: 27 Mar 2003
Posts: 123
Helped: 7
Location: Bangalore, India

28 Jul 2008 4:57 what is pwm inverter

hello taner,

can you also share the pcb layout diagram.

thanks
kib

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

10 Jan 2009 16:31 tz2l9

Hi Friends,
here is an electrical circuit of the sine-wave invetrer with PIC16F876A
made it with Аltium Designer 08.
The PCB's view and dimension is your choice.
I upload and the Аltium libraries related with inverter circuit.
Best regards.
Taner

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Last edited by Taner on 28 Feb 2009 20:53; edited 4 times in total

mvs sarma

Joined: 23 Apr 2006
Posts: 381
Helped: 36
Location: Hyderabad, India.

14 Jan 2009 5:26 sine wave pwm pic

Taner wrote:

the battery input is shown as 10-16V DC and the the same is extended ti LM317 configured for 12V output. I fear the input should be atleast 3V more than the needed output, thus the design needs revision.
Sarma

FvM

Joined: 22 Jan 2008
Posts: 5161
Helped: 767
Location: Bochum, Germany

14 Jan 2009 7:37 pwm inverter squematics

Good point. Considering all voltage drops and maximum output voltage of the TLP250, a step-up converter or bootstrap circuit for MOSFET gate drive seems advisable to guarantee reliable operation at minimum battery voltage.

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

14 Jan 2009 20:20 inverter with pic

Hi Friends,
thank you very much for notes,
Yes, optodrivers TLP250 are working from 10-35V and if you supplying them directly from input DC voltage (before LM317) they can work in overall input voltage range (10.8-16Vdc).
The above electrical circuit was changed and archive updated.
Best regards.
Taner
Very Happy

brahmi

Joined: 15 Jan 2009
Posts: 1

15 Jan 2009 12:00 pwm inverter schematics

please, I need a flowchart of the C code for PWM inverter with PIC16F876A
Thank you

Added after 15 minutes:

Please , I need some explainations for the C code for PWM inverter, in oder word how the control part of the inverter work?
thank you

codewiz

Joined: 14 Sep 2008
Posts: 75

16 Jan 2009 10:17 pic controlled inerter

pls, has anyone tried this project. i mean if u have built it and it's working for u, pls share.

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

16 Jan 2009 19:43 pic inverter

Hi Friends,
I was built this inverter circuit and test it. The circuit works fine.
But there still have some finishing works in software.
I will be complete the software soon, i hope.
I was attach a pictures of the PCB with some soldered components (without power transistors, current transformer and output LC-filter).
Best regards.
Taner

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mvs sarma

Joined: 23 Apr 2006
Posts: 381
Helped: 36
Location: Hyderabad, India.

16 Jan 2009 20:48 pwm inverter pic

Taner wrote:

Nice work and a cool PCB Taner !!

Please see the current transformer secondary cant be open like shown in your schematic. Perhaps you might have the load resistor, but not shown in schematic.

VERY Nice design.

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

16 Jan 2009 22:39 rds feedback inverter

Hi mvs sarma,
Thank you very much, but only the electrical circuit is mine,
PCB was designed from my friend.
Current transformers secondary side has a two load resistors: R8=100 for high range and R18=1.5k for low range. They are in the feedbacks of two OPAMPs (U1A and U1C).
Best regards.
Taner.

mvs sarma

Joined: 23 Apr 2006
Posts: 381
Helped: 36
Location: Hyderabad, India.

17 Jan 2009 11:07 pic16f876 sinewave inverter

Taner wrote:

I fear, that they can't be called load on secondary of the current transformer. Please refer to electrical basics of current transformers.
Sarma

codewiz

Joined: 14 Sep 2008
Posts: 75

17 Jan 2009 12:40 pic ile sinus pwm üretimi

Hi mvs sarma. i like ur style of criticism. u seem to be very grounded in electronics & this subject. this means that ur active involvement in this topic will encourage Taner to modify his design & finishing touch on time. i'm quite new to sine wave inverter design but have studied alot but still have some doubt which may sound absurd but important to me to clear my head. hence will be grateful if u guys answer subsequent questions in posts. To start with, i know how the 32 PWM signal was got which is similar got from carrier frequency(triangular wave) and reference sine wave. pls, does it mean that for 1 phase of the final sine output, the mosfet pair switches on& off according to PWM for 32 times b4 shifting to the 2nd mosfet pair switching for another 32times to complete the cycle? pls let me know if i'm missing up things.

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17 Jan 2009 12:40 Ads

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

17 Jan 2009 14:34 servo-invertierer pic

Hi mvs sarma
This two OP AMPs (U1A and U1C) forms two active current to voltage converters
with two different current to voltage gain ratios.
For more info just look here:
http://en.wikibooks.org/wiki/Circuit_Idea/Op-amp_Inverting_Current-to-Voltage_Converter

Hi codewiz
Yes, but carrier frequency is 20kHz (generated with buit-in PWM of the PIC MCU) and each half period (10ms) we have 32 changes in the PWM signal, this makes 64 changes in whole period (20ms). But we generated only the half period of the sine-wave and with the help of the direction signal we can get the whole period of the sine-wave in the output of the inverter.
In this inverter we have a full-bridge power circuits with 4 transistors (paralleled-8 transistors), Q1, Q3, Q5 and Q7.
Two of transistors works with low frequency - 50Hz (Q5 and Q7) depending on the state of the A/B (direction) signal (RC1). Other two transistors (Q1 and Q3) works with high-frequency (20kHz) of the sinewave PWM signal.
Best regards.
Taner

voravat

Joined: 11 Jan 2009
Posts: 10

17 Jan 2009 17:30 how pwm inverter works

Hi Taner

for the ct ,can i use this ? http://www.es.co.th/Schemetic/PDF/TZ2L9-TAEH.PDF

and programing that u told recently is synchonization?

thx very much:D

Last edited by voravat on 19 Jan 2009 18:40; edited 1 time in total

codewiz

Joined: 14 Sep 2008
Posts: 75

19 Jan 2009 16:46 pic ile inverter

[quote]

Quote:

"In this inverter we have a full-bridge power circuits with 4 transistors (paralleled-8 transistors), Q1, Q3, Q5 and Q7.
Two of transistors works with low frequency - 50Hz (Q5 and Q7) depending on the state of the A/B (direction) signal (RC1). Other two transistors (Q1 and Q3) works with high-frequency (20kHz) of the sinewave PWM signal.
Best regards.
Taner "

i appreciate your effort and time. the above explanation has revealed my misconception. To further clarify the above, 1. can i subsequently refer to Q1 and Q3(running on 20khz PWM signal) as High MOSFETS While Q5 and Q7(running 50Hz) as Low MOSFETS. 2. Pls, how is the 50Hz running Q5 and Q7 generated? 3. What are the switching patterns of the 4 transistors?. i mean which group switch on and off together. i will be grateful if these doubts are cleared.

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

21 Jan 2009 21:30 pwm inverter code

Hi codewiz,
sorry for delay, but i am so busy at work.
I drew a block scheme including the main parts of the inverter.
This will be describe a working mode of the inverter and switching patterns for the
4 transistor.
Best regards: Taner
Very Happy

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