Method and circuit for detecting faulty recirculation diode in a

Details Method and circuit for detecting faulty recirculation diode in a Method and circuit for detecting faulty recirculation diode in a

1994-04-22

1996-11-19

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323299, 361 93, G05F 1573, H02H 3087

Patent

active

055766153

ABSTRACT:
A circuit (10) and method for detecting a fault in a recirculation diode (13) in a switched power supply. The power supply has a switching transistor (12) that is turned on and off by a power supply control device (31), switchably applying a supply voltage (15) to an output (14). The recirculation diode (13) is connected between the output (14) and a reference potential (16). The circuit includes a sense resistor (11) in series between the supply voltage (15) and the switching transistor (12). A biasing element (25) is connected to clamp a current control element of the switching transistor (12) to the reference potential (16) when the switching transistor (12) is switched off so that a fault in the recirculation diode (13) results in a current flowing in the switching transistor (12). An amplifier (33) is connected across the sense resistor (11). The amplifier (33) has a variable gain (35) controlled by the power supply control device (31), a normal gain when the switching transistor (12) is turned on, but an increased gain when the switching transistor (12) would be normally turned off, to measure the current, if any, in the switching transistor (12) resulting from any faults in the recirculation diode (13). A control transistor (27) controlled by the power supply control device (31) is connected to switchably connect a voltage (30) to the current control element of the switching transistor (12).

REFERENCES:
patent: 4725769 (1988-02-01), Cini et al.
patent: 4837653 (1989-06-01), Yip
patent: 4860154 (1989-08-01), Fazlollahi

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