K
Ken Taylor
- Jan 1, 1970
- 0
Chris Jones said:I think if you open up the PC power supply and find the terminals of the
main input capacitor, these terminals could be brought to a shrouded
(finger proof) insulated connector on the back of the power supply. You
could then build a grounded box containing a bank of capacitors which would
be connected essentially in parallel with the internal capacitor of the PC
power supply. The larger capacitor could keep the supply running for a
second or more. In order to avoid very large surge currents when the PC is
first turned on, a high-power series resistor should be inserted so that
the external capacitor charges gently. A diode across the charging
resistor would allow the fairly large current to flow out of the capacitor
when powering the PC.
5Amp 400V
--------|<|-------
| |
.-----/\/\/------.
| 10kOhm |
| .-----------
| + | + |
----- ------------- \
----- ------------- /
| PC cap | external \ 100kOhm
| | cap / Bleed resistor
| | |
-----------------.-----------
There are numerous safety considerations when building something like this,
and if you don't understand the risks involved then it is better to learn
about the dangers before considering building it.
Chris
The 'main input capacitor' will be at several hundred volts (depending on
OP's location). This is therefore a very BAD idea, given the OP has little
idea of what's going on in these supplies. This is without even considering
how the input side of the power supply is going to react to the addition of
several extra amp's of surge current.
Ken