Trouble determining apparatus for DC boosting circuit

Details Trouble determining apparatus for DC boosting circuit Trouble determining apparatus for DC boosting circuit

2005-11-01

2005-11-01

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

Reexamination Certificate

active

06960903

ABSTRACT:
A trouble determining apparatus for a chopper type DC boosting circuit capable of determining whether or not a switching device is in trouble securely and quickly and when the switching circuit is in trouble, preventing other circuit from being in a trouble. Upon determining a short-circuit trouble of a transistor Q, a boosting circuit control unit22is turned OFF a power relay RL and then determines whether or not a voltage VP1of a connecting point P1rises over a first set voltage VS1by the time when a first predetermined time t1elapses since an ignition switch IG is turned ON with the transistor Q set to OFF. Upon determining an open trouble of the transistor Q, the boosting circuit control unit22determines whether or not the voltage VP1of the connecting point P1falls below a second set voltage by the time when a second predetermined time t2elapses since the transistor Q is turned ON with the power relay RL set to OFF and whether or not the voltage VP1falls from a state before the transistor Q is turned ON by more than a third set voltage.

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