Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
This is not a question but a way to do it.
When you want to make your prototype of a two faced circuit (copper traces in both sides), which is a way of making all complex prototypes, for example the microcontroller circuits, you can follow the next procedure, which worked fine for me:
0. Make...
Hello!
Proteus makes good things, but in ARES, after have run the autorouter, I have an error in a trace and the program doesn't let me to correct it. I don't know why there is a trace missing from a pin of a resistance to a pin of another resistance. (and it doesn't show error in CRC errors)...
I'm in the process of designing a device and pretended to use a PIC 18f4550, in a way I could build 3 sinusoidal signals, 120 degrees delayed each, so it is a triphasic system at a frequency a little lower than 5,000 Hertz. (The instruction for hpwm in picbasic I didn't find the way to use it...
Yes, it generates a sinuidal pulse train, but this needs an LC filter yet, not specifyed here, who convert that pulse train in a smooth pure sine wave signal simmilar to the commercial signal. It is a matter that I have to solve yet, but if somebody wants to make this aproach for an inverter...
'This is a version for Sinus wave inverter with hardware PWM module
' in uController
'It alternates pins, each one responsible of a branch on a H bridge
'half positive cycle on 96 program cycles
'Table of 1/4 cycle, 48 pulses then it decrement pointer to get 1/2 cycle
'Then it repeats but for...
This squema I think can clarify what I am trying to do. I was trying to avoid the logical gates after the PIC, but as I have only one PWM port... The other factor is that I have already a printed circuit board good for this PIC, so I only will put components on it, solder and will see it...
Yes, the HPWM instruction of PicBasic uses the PWM hardware. I ommited this because I wanted to use two branches (so two pins), one for each branch, but this uController has only one PWM port RB3, so I have to use an external AND gate in order to get the two branches control.
OK...
Well, considering comments, What do you think of this version of program for inverter?:
'This is a version for Sinus wave inverter without PWM or HPWM instructions
'It alternates pins, each one responsible of a branch oa an H bridge of IGBTs
'half positive half cycle on 96 program cycles
'Table...
I was in a confusion: PWM is different than HPWM. PWM is a very slow software based picbasic instruction. HPWM is a pcbasic instruction that handles the hardware based PWM for PICs with this capability. So, table 9-3 of the PIC I have, works for HPWM instruction on CCP1 (RB3 port) and the times...
The advantage I saw of using PWM function would be not to deal with measuring time and its interruptions.
* Is there a picbasic document who gives us the time of execution of each instruction in the loop as the program showed?.
* Would it be better to make the subrutine of clock, to make the...
>
16F628A has 128 EEPROM bytes, so I'd have to handle 1/4 of sine cycle and decrement pointer to handle about 100 data table. So it is possible but some tricky, and maybe I liked how short is this program without memory and table handles.
What do you think?
- - - Updated - - -
For...
see my post "Sine PWM calculating instead of table" or something like that, I don't know exactly if this works but it seem it does. I'm waiting a guru answer. You would have to add a factor in the program to control the width. I tryed to do the control signal analogical (comparing a...
I have seen several posts about PWM in order to make a one phase inverter,
and most use a long values table calculated to get the sine wave,
but what if it calculates the duty value each time?
I have a graph where can be seen some details, but I don't see the way to
attach it. There I...
This could seem basic, but I have trouble with an LM311 and TTL, please see ‘LM311_y_Shmitt.png’ to see diagram
With a LM311 comparator I’ve got a squared signal from a ICL8038 sinus signal, the squared very adequate to which I expected. It has some noise that I’d like not to have so I tried...
Now another thing. I'm securing that the control circuit doesn't emit for any reason a short circuit state. Then next question is if IGBTs gate support to be feeded directly by a CMOS gate who emit 12 V, without amplification with a transistor? The gate datasheet says it can support just 2.4...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
