Load drive apparatus including power transistor protection circu

Details Load drive apparatus including power transistor protection circu Load drive apparatus including power transistor protection circu

1994-09-26

1995-08-22

DeBoer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 87, 361 93, H02H 716

Patent

active

054445957

ABSTRACT:
A load drive apparatus is used in a vehicle direction indicating apparatus operable free from overcurrents and overvoltage. The load drive apparatus includes: a charging/recharging capacitor; a charging/recharging circuit for charging/recharging the capacitor at a preselected time constant in such a manner that a voltage across the capacitor is varied between a preset upper limit voltage and a preset lower limit voltage; a drive circuit for turning ON a power transistor series-connected to a current path employed to supply a current from a DC power source to a load, thereby driving the load when the charging/discharging circuit causes the capacitor to be charged, or the voltage across the capacitor is higher than, or equal to a predetermined voltage defined between the upper limit voltage and the lower limit voltage; overcurrent judging means for judging whether or not a voltage across terminals of the power transistor connected to the above-described current path exceed an overcurrent judging voltage.

REFERENCES:
patent: 5200879 (1993-04-01), Sasagawa et al.
patent: 5301085 (1994-04-01), Miettinen

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