Best way to shut down HPWM channel?
Hi,
I am playing with a circuit that charges a capacitor and then dumps it into a battery (pulse charging). All I need to do is turn HPWM channel 1 on and charge cap, then turn HPWM channel 1 off and Turn HPWM channel 2 on to dump the charge back to the battery. Code is attached, but I am wondering if setting CCP1CON to disable is the best way to turn off channel 1 before I turn on channel 2?
Thanks in advance.
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I have used following to turn off HPWM.
Don't know if that is right way to do it, but it is workingCode:<body><!--StartFragment--><pre><code><font color="#000000"> CCP1CON = %00000000 T2CON.2 = 0 </code>
It would be nice to hear if there is some better way to do that.
BR,
-Gusse-
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Why do you need to turn the channel off? Do you need to use that channel for something else also?
Can't you just set the PWM duty cycle to 0?
HPWM 1, 0, 3550
steve
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Channel shut down
Hi,
Sure, I guess I could take the duty cycle to zero. I suppose I can test it.
I needed to shut the first channel off because this is a closed loop system, I.E. Battery, Mosfet > inductor > bridge > cap > mosfet > battery. Therefore I needed to isolate the input from the output to some degree. The goal was to see if lead acid desulfation can occur if a constant pulse is sent to the battery after charging a cap.
In theory it should work because we are forcing the lead sulfate back into solution in a brute force kind of method with a high voltage and high current pulse.
Thanks for the suggestions guys. I suppose either method will work equally well, I just wonder how many clock cycles it will take for either method or if it's even a concern. I'd surely like to use the fastest method.
Last edited by LetTheSmokeOut; - 26th January 2010 at 21:06.
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The fastest approach is probably just setting the pin to input. Then flipping it back to
output when you need PWM on again.
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PWM shutdown
Thanks Bruce, I will try that as well.
Tad
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