H-Bridge with PWM

[dino_hasan]

How I drive MOSFET IRF540 & IRF9540 on my H-Bridge circuit but it's control from PIN PWM (OC0) ATMEGA16??I've been try but the result just make the motor dc direction reverse and forward.

 

[dknguyen]

SO it sounds like you have everything working with the forwrard and reverse right? YOu just want to make it so you can adjust the speed now? Are you asking how to set up the PWM pin on the ATMEGA16 in software?

 

[dino_hasan]

yes, but...

yes...
what i want is the driver not only reverse-forward but also can controlled the output voltage (in this case i controlled the speed).
For the PWM program for ATMEGA16 i've make and it work.

 

[dknguyen]

THe driver is probably an H-bridge (you can google for that one or search the forums). It lets you have forward/reverse for the motor. For speed control, you just PWM the inputs to the H-bridge.

 

[jpanhalt]

If you are looking for something to drive the mosfets in the H-bridge with a signal from your microcontroller, I have used the LT1158. It seems pretty robust and can adequately drive paralleled mosfets for more power. There are other drivers available, but I like this one because it requires only a single PWM input to drive both top and bottom mosfets. In other words, you don't have to worry about programming a delay to avoid having both top and bottom conducting at the same time. John

 

[picbits]

Also consider looking at the H bridge MOSFET drivers from Intersil.

I've used a few from them and had very good results - they are also nice people to deal with and answer their emails promptly

 

[nelson_kh]

PWM that control speed

hi
i am new in this forun,i want to ask izzit ccp1 and ccp2 control the speed of the whell?and wat is the different of CCP1L and CCP1H??? i set alr y my motor still can not move??? i m using power windows as my dc motor and pic16f877a. ur help will much appresiated!! thz

 

[jpanhalt]

nelson,
See the datasheet. In mine, it is Table 8-4, page 70. To wit: "15h CCPR1L Capture/Compare/PWM Register 1 (LSB)
16h CCPR1H Capture/Compare/PWM Register 1 (MSB)"

The datasheet goes into much more detail about how to write the LSB's and MSB's of these words and what they do. John

 

[nelson_kh]

thz for reply....
do u got any simple sample code that can control the speed?? it can help more easy to understand!! i set the CCP1L,CCP1CON,T2CON, PR2 and a output signal for motor alr but motor still cant move. thanks.

 

[jpanhalt]

I would suggest you start a new thread, as these questions are sufficiently off the main subject that the best people to answer your questons may not see them. John

 

[nelson_kh]

Thz jon.....
see u in the new thread!!!

 

[dino_hasan]

thanx

THe driver is probably an H-bridge (you can google for that one or search the forums). It lets you have forward/reverse for the motor. For speed control, you just PWM the inputs to the H-bridge.

ye....it work..........................

 

[kemo0o]

how do u get it ? ? plz put sch file here to show us how do you solve the problem

 

[dino_hasan]

Thx for All....