Drive circuit device for inductive load

Details Drive circuit device for inductive load Drive circuit device for inductive load

1988-09-27

1989-07-04

Wong, Peter S.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323284, 361152, 361153, G05F 1613, H01H 4732

Patent

active

048454206

ABSTRACT:
In a drive circuit device for an inductive load, the inductive load and a detecting resistor are incorporated in a current supply circuit in series relation to a drive transistor. An operational amplifier is operative in response to detecting voltage fed-back from the detecting resistor, for controlling the drive transistor, in turn, for controlling supply current flowing through the inductive load to a predetermined value. Turning-on and -off of the drive transistor are controlled by a switching element operative in response to a control signal, thereby carrying out current supply to an inductive load and stoppage of the current supply. A feed-back circuit is provided, in which a response element supplies feed-back current to be controlled by the operational amplifier, to the feed-back resistor, in response to the turning-off of the drive transistor. The operational amplifier carries out feed-back control without being saturated, even at the stoppage of the current supply to the inductive load.

REFERENCES:
patent: 4048665 (1977-09-01), Lia et al.
patent: 4106008 (1978-08-01), Bergan
patent: 4238710 (1980-12-01), Nelson
patent: 4287436 (1981-09-01), Tezuka et al.
patent: 4503480 (1985-03-01), Pickard et al.
patent: 4536818 (1985-08-01), Nielsen
patent: 4556926 (1985-12-01), Yanagida

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