Switching power supply unit

Details Switching power supply unit Switching power supply unit

2005-04-12

2005-04-12

Tso, Edward H. (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

Reexamination Certificate

active

06879132

ABSTRACT:
A switching power supply unit which contains a secondary battery for backup and a circuit for controlling the charging and discharging of the secondary battery in its enclosure and which properly manages the charging and discharging of the secondary battery. A switching power supply circuit includes a rectifying and smoothing circuit for smoothing alternating-current input from commercial power supply Vin at normal operation time, a battery pack charged by a DC—DC converter which can continuously output a predetermined direct-current power supply voltage for supplying power supply voltage to the DC—DC converter at the time of a stoppage in alternating-current input, a charging circuit section for controlling the charging and discharging of the battery pack, and a charging and discharging control circuit. The battery pack and circuits, such as the DC—DC converter, are mounted in the same unit enclosure.

REFERENCES:
patent: 5744936 (1998-04-01), Kawakami
patent: 11-098829 (1999-04-01), None
patent: 11-136943 (1999-05-01), None
patent: 2000-014043 (2000-01-01), None
patent: 2002-027683 (2002-01-01), None

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