PLUS+1 User Forum
PLUS+1 Hardware => Controllers => Topic started by: Rafal_Typiak on March 22, 2011, 12:56:26 PM
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Hi.
I was wondering if there was a way to change a standard "0 -> +supply voltage" polarisation to a "-supply -> + supply" ?
I was thinking of doing it on a 050 or 088.
If it's possible, than what do I need to do to achieve it?
Thanks,
Rafal Typiak
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Hello Rafal,
I'm really sure what you mean but we can't use negative voltage.
Best regards
Stefan
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Heh,
I've just read my first post again and saw that you might have actually misunderstood me. My fault :D. I wasn't asking if I can power the controllers from '-supply +supply' but if I could generate such voltage on the outputs of the controllers. I wanted to power a sensor which needs a '-12 +12' power supply.
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Hello,
I'm sorry, it's not possible.
Best regards
Stefan
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Oh well,
thanks anyway.
Rafa?
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I thought that you can use the pin 40 and pin 50 to form an H bridge.
Or am I on a different angle?
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Hello,
Yes, that's correct. But the H-bridge just change supply and ground between 2 pins.
You don't get a negative voltage related to ground.
Best regards
Stefan
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I have sucessfully controlled a Rexroth PID controller that require -10 to +10 VDC signal using a H-Bridge output. It is my understanding that with most devices simply reversing the polarity will work. I set the PWM freqeuncy to 4000 Hz but I still had to use a RC filter to smooth out the signal.