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 10:32:12 GMT
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Viewed:
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870 times
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In lugnet.robotics, Carl Schaefer writes:
> Man, don't sugar coat it ....
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 will make the voltage across the inductor fall very fast.
Normally you apply a diode to swallow this current, so that the voltage
cannot become higher than 0,7 volts.
In tha case of the RCX the circuit is not broken, it is short circuited
when you stop the motor. If you make the output float I think the RCX has
internal diodes to secure the voltage doesn't drop.
Anyway it's a good idea to add the diode - this secures nothing gets
broken.
I hope this clearified my thoughts.
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Jacob Schultz
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Message has 1 Reply:
 | | Re: 5VDC Voltage Regulation
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| Jacob Schultz <dungeonmaster@get2net.dk> wrote in message news:FIrMLo.H8K@lugnet.com... (...) 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 (...) (25 years ago, 28-Sep-99, to lugnet.robotics)
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