Inductive load discharge current recirculation circuit with sele

Details Inductive load discharge current recirculation circuit with sele Inductive load discharge current recirculation circuit with sele

1989-07-14

1990-04-10

Wong, Peter S.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323282, 323351, G05F 156

Patent

active

049163787

ABSTRACT:
A circuit for recirculating the discharge current of an inductive load driven from the high side of the supply at two different recirculation voltages which may be selected for implementing a slow or a fast recirculation of the current advantageously employs a single power element represented by an NPN transistor functionally connected in parallel to the load. During a driving phase of the load a slow recirculation of the discharge current is implemented by delivering to the base of the recirculation NPN transistor a current sufficient to keep it saturated. upon switching off the load, when a fast recirculation of the dischage current through the recirculation NPN transistor is desired, delivery of the saturating current to the base of the recirculation transistor is interrupted and the transistor remains conducting having a diode and a zener diode in opposition thereto connected in series between ground and the base of the recirculation NPN transistor for permitting the recirculation at a voltage substantially equal to the sum of the voltage drop through the first diode, the zener voltage and the base-emitter voltage of the recirculation NPN transistor.

REFERENCES:
patent: 3525924 (1970-08-01), Atterholt
patent: 3809998 (1974-05-01), Mansson
patent: 4598244 (1986-07-01), Majima et al.
patent: 4658203 (1987-04-01), Freymuth
patent: 4691271 (1987-09-01), Rosenbaum et al.
patent: 4733159 (1988-03-01), Edwards et al.

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