Active overvoltage control for inductive load driving

Details Active overvoltage control for inductive load driving Active overvoltage control for inductive load driving

1988-10-07

1989-11-21

Salce, Patrick R.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323285, 361 91, 361111, 361 18, H02M 3137, H02H 320

Patent

active

048825328

ABSTRACT:
A circuit for limiting the transient overvoltage across a power transistor connected in series with an inductive load between a supply rail and a ground rail of the circuit and operated to switch ON-OFF the inductive load utilizes a comparator circuit for switching-ON again the power transistor in order to discharge the energy stored in the load's inductance. The voltage across the power transistor is sensed by a first voltage divider, while a reference voltage is obtained by a second voltage divider connected between the supply and ground. The circuit is practically insensitive to temperature and to variations of the supply voltage and is easily implemented.

REFERENCES:
patent: 4566052 (1986-01-01), Kammiller
patent: 4727308 (1988-02-01), Huljack et al.

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