Subject:
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Re: 5VDC Voltage Regulation
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 28 Sep 1999 12:31:32 GMT
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Viewed:
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699 times
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Jacob Schultz <dungeonmaster@get2net.dk> wrote in message
news:FIrMLo.H8K@lugnet.com...
> Normally you apply a diode to swallow this current, so that the voltage
> cannot become higher than 0.7 volts.
A "freewheeling" diode is a good idea generally, but the RCX must already
have diodes built into the driver IC. It has to turn on and off the motor
hundreds of times a second to generate PWM.
http://www.melexis.com/site/10402/f_10402.htm is the driver data sheet, but
it doesn't show the diodes.
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Message has 1 Reply:
 | | Re: 5VDC Voltage Regulation
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| (...) You can't have the diodes on the motor because it goes in both directions. If you put a diode out there, you would have a dead short in one of the directions. Such things need to be built into the H-bridge, not the motor leads. So, I seriously (...) (25 years ago, 28-Sep-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: 5VDC Voltage Regulation
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| (...) OK. What I was thinking of was that if a current flows through a coil, that be a relay, transformer or motor, the current can't change at an instant. If you break the circuit current will keep running through the coil for a short time. This (...) (25 years ago, 28-Sep-99, to lugnet.robotics)
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