need help with power inverter

[mikeh]

As Far As I Know A Full Bridge Is Sine Wave Less Is Mod. Square Wave
Maybe Some Trick Components.
Or Using The One Ccp To Gen. Freq. Like You Can Do With A 555

[sudipmuk]

As Far As I Know A Full Bridge Is Sine Wave Less Is Mod. Square Wave
Maybe Some Trick Components.
Or Using The One Ccp To Gen. Freq. Like You Can Do With A 555

These PCBs are using a full H- Bridge , and the output is a pure sinewave . I have seen the output in an oscilloscope. Four pins of the PIC are being used to drive the mosfets.

[babalola]

hi guys,
the technique of using the single ccp on 16f72 is to generate additional square wave called switcher to modulate the sine pwm of the controller, the switcher wave is of the same frequency with the sine pwm wave.this will eventually give the two leg sine signal that can power the h-bridge output.if am less busy i will post a basic schematic of the steering circuits.

regards,
babalola.

[sudipmuk]

Hi
I know about steering circuits and i can make one myself too . But i was telling about these PCB s that they do not have a steering circuits. The four waves needed for the H Bridge is coming from 16F72 . And they have used RC2, RC3, RC5 and RC6.
Any idea how they are doing it without steering circuits ?

Sudip

[sougata]

Hi All,

A compare module can generate software PWM effectively with low ins.cyl overhead. The stearing is all done in software.


You turn on the pin (according to the steer logic) and with compare interrupt turn off all the outputs. Comapre value comes in from the PID. Turning off the outputs in the ISR and turning them on (sterring) gives you the dead-time automatically. It is not that complicated.

Sorry can't share the code. (Mostly ASM)