초록 ▼

An uninterruptible power supply includes first and second inputs for receiving AC and DC power respectively, first and second switching circuits, an auxiliary power supply, a transformer, a selection circuit, an A to DC converter and a hold-up capacitor. The hold-up capacitor can provide energy stor

An uninterruptible power supply includes first and second inputs for receiving AC and DC power respectively, first and second switching circuits, an auxiliary power supply, a transformer, a selection circuit, an A to DC converter and a hold-up capacitor. The hold-up capacitor can provide energy storage for both AC and DC operation.

대표청구항 ▼

[ We claim:] [1.] An uninterruptible power supply having an output comprising:first and second sower inputs for receiving AC and DC power respectively;first and second switching circuits each having a switching circuit input and a switching circuit output, the switching circuit inputs of the first a

[ We claim:] [1.] An uninterruptible power supply having an output comprising:first and second sower inputs for receiving AC and DC power respectively;first and second switching circuits each having a switching circuit input and a switching circuit output, the switching circuit inputs of the first and second switching circuits being coupled to and receiving power from the first and second power inputs respectively;an auxiliary power supply coupled to said first and second inputs;a transformer having a primary winding coupled to the output of the first switching circuit, a tertiary winding coupled to the output of the second switching circuit, and at least one secondary winding providing power at a regulated DC voltage to the output of the uninterruptible power supply;a selection circuit selectively providing power from at least one of the first switching circuit, the second switching circuit, and the auxiliary power supply, to the output of the uninterruptible power supply;an AC to DC converter having an input coupled to the first power input and an output coupled to the first switching circuit, the AC to DC converter generating an output voltage at the output of the AC to DC converter when power is available at the input of the AC to DC converter; anda hold-up capacitor connected to the output of the AC to DC converter and arranged to maintain the output voltage at the AC to DC converter at an operational level for a predetermined time after an AC input voltage at the first input falls below a selected level, the first switching circuit being arranged to couple power from the transformer to the hold-up capacitor for storage on the hold-up capacitor in response to power received by the transformer from the output of the second switching circuit.