Here is simple Electronic Project of the basic power supply and filter circuit.
This circuit provides about 294 volts at a 50mA load and nominal line. It also produces about 800mV of ripple. At 20% low line, this voltage drops to 232 volts, at -10% low line, the voltage is 260 volts. At +10% high line, the output goes to 320 volts, and at 20% high line, the output climbs to 355 volts. The voltage vs load current looks like this:
Notice that at load currents below 40mA, the voltage rises rapidly. This is due to the LC filter. At those currents, the critical current for choke input filtering is not satisfied. This is done purposely so we can see the effects of different regulators.
This circuit provides about 294 volts at a 50mA load and nominal line. It also produces about 800mV of ripple. At 20% low line, this voltage drops to 232 volts, at -10% low line, the voltage is 260 volts. At +10% high line, the output goes to 320 volts, and at 20% high line, the output climbs to 355 volts. The voltage vs load current looks like this:
Notice that at load currents below 40mA, the voltage rises rapidly. This is due to the LC filter. At those currents, the critical current for choke input filtering is not satisfied. This is done purposely so we can see the effects of different regulators.
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