Well there you go! No isolated (or even regulated) DC inside the
popper, which makes sense from a cost standpoint. I've never
disassembled a hot-air popper, so I had no idea what would be in there.
-B
On 10/29/18 11:03 AM, Shane Trent wrote:
Brain,
The popcorn poppers often use a secondary heating coil as a dropping
resistor to drop the incoming AC line voltage down to the voltage needed
by the motor. The four diodes around the motor power terminals make a
full wave bridge rectifier to convert the now lower voltage AC to DC to
drive the motor. There is no filter capacitor after the full-wave bridge
so the motor is getting pulsed DC, but the motor doesn't care. The
inductance of the motor and the rotating mass do serve to smooth the
current a little.
Shane
On Mon, Oct 29, 2018 at 10:38 AM Brian via TriEmbed
<[email protected] <mailto:[email protected]>> wrote:
> I measured around 16 volts DC going into the motor. It was
increasing slowly as the motor warmed up. Started around 15.9
Volts. Does that help?
Sounds like you're in good shape to run it off a DC power supply
like in
the article. If the popper's own DC power supply is isolated, you
could
just use it. Note that there's a high chance it isn't isolated.
> It looks like there are two diodes in series attached to each
motor terminal.
So.. diode-diode-motor-diode-diode? Hm. What's between that and the
AC power input? It's not critical, but now you've got me curious...
> Do I need to disassemble it more to learn something else?
Probably not, but now *I* want to disassemble it more! ha
<snip>
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