Power supply device

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

Reexamination Certificate

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Details

C363S097000, C323S907000

Reexamination Certificate

active

07315461

ABSTRACT:
An object of this power supply device is to enable an overheat protection level and an overvoltage protection level to be set accurately. This power supply device includes a Schottky barrier diode (D52), which is placed as a temperature detection element at a region where a temperature is measured, to which a reverse voltage is applied, and through which a reverse leakage current flows; a comparator (Z51) which sets a potential of an output terminal thereof to a low level when a voltage corresponding to the reverse leakage current becomes equal to or more than a reference voltage; and a light-emitting diode (PC2) which is connected between an output terminal (8a) and the output terminal of the comparator (Z51), and has a current of a predetermined value or more flowing therethrough to emit light because the output potential of the comparator (Z51) is set to the low level, wherein an operation of a control circuit (12) is stopped by a thyristor (TH1) which is turned on, based on the current flowing through a phototransistor PC1, in response to the light emission of the light-emitting diode (PC2).

REFERENCES:
patent: 6069802 (2000-05-01), Priegnitz
patent: 6653899 (2003-11-01), Organvidez et al.
patent: 6771059 (2004-08-01), Zwicker
patent: 6870747 (2005-03-01), Bridge
patent: 62-89477 (1987-04-01), None
patent: 21237-1986 (1987-08-01), None
patent: 01-122367 (1989-05-01), None
patent: 88709/1989 (1991-03-01), None
patent: 05-40064 (1993-02-01), None
patent: 5298-1992 (1993-08-01), None
patent: 06-233528 (1994-08-01), None

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