DC power supply

摘要

A DC power supply including a resonant circuit on a secondary side of a transformer suppresses a surge voltage during power recovery of diodes constituting a rectifier circuit, correctly estimates a load current from a secondary current of the transformer, and adjusts supplied power when a load is light. The DC power supply includes a DC voltage source, a converter, a transformer, a rectifier circuit, a resonant circuit composed of a resonant switch 106 and a resonant capacitor 107, a filter reactor, a filter capacitor, a snubber diode 110, a snubber capacitor 109, and a load. The DC power supply further includes first and second voltage sensors 101 and 111, a current sensor 104, and a controller 114 for inputting output signals of these sensors and outputting a signal for controlling gate pulses of semiconductor devices constituting a converter 102 and the resonant switch 106 and a signal for adjusting operation timings of A/D converters 200 to 203 converting the signals of these sensors.