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A battery backup system using a power factor correction (PFC) front end as a DC-to-DC converter of a power supply for supplying a regulated DC input signal to a main power converter. The battery backup system includes a battery backup for supplying power, a switch circuit for connecting the battery

A battery backup system using a power factor correction (PFC) front end as a DC-to-DC converter of a power supply for supplying a regulated DC input signal to a main power converter. The battery backup system includes a battery backup for supplying power, a switch circuit for connecting the battery in the event of loss of the AC input signal and a detection circuit for detecting the presence or absence of AC power for controlling the switch circuit. The PFC front end preferably receives either a pulsing DC voltage from a bridge rectifier or the battery voltage and switches this voltage through a series inductor for providing the regulated DC input voltage to the main power converter. The battery is switched in to replace the AC source and rectifier in the event of loss of the AC signal. In the preferred embodiment, the PFC circuit includes a series inductor and diode, a switching transistor and a control circuit for providing the regulated DC input voltage. The backup battery is coupled through a diode and a controlled switch to the input of the PFC circuit.

대표청구항 ▼

[ I claim:] [1.] A battery backup system for a first power converter that provides a regulated DC input signal to a second power converter, the first power converter receiving an AC power signal from an AC source and including a bridge rectifier for converting the AC power signal to a pulsing DC sig

[ I claim:] [1.] A battery backup system for a first power converter that provides a regulated DC input signal to a second power converter, the first power converter receiving an AC power signal from an AC source and including a bridge rectifier for converting the AC power signal to a pulsing DC signal, said battery backup system comprising:a power factor correction circuit for receiving the pulsing DC signal that provides the regulated DC input signal;a detection circuit for detecting the AC power signal;a backup battery for providing power to the second power converter when the AC power signal is absent; anda switch circuit coupled to said detection circuit, to said power factor correction circuit and to said battery for coupling said battery to the input of said power factor correction circuit when the AC power signal is absent and for otherwise disconnecting said battery.