Current control circuit with particular application in bipolar c

Details Current control circuit with particular application in bipolar c Current control circuit with particular application in bipolar c

1981-01-16

1984-05-22

Shoop, William M.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

318345F, 318696, 363131, H02M 700

Patent

active

044505175

ABSTRACT:
The present invention is a switch mode current control circuit which is particulary useful with step motors. The circuit has a first transistor, a coil and a first resistor connected in a series with a first voltage source. An optocoupler having a light emitting diode and a second transistor therein has the light emitting diode connected across the first resistor and the second transistor is connected across the base emitter junction of the first transistor. A second resistor is connected to the base of the first transistor and to the second voltage source. A diode is connected across the coil.

REFERENCES:
patent: 3371259 (1968-02-01), James et al.
patent: 3977024 (1976-08-01), Haneji et al.
patent: 4107772 (1978-08-01), Uchida et al.
patent: 4208868 (1980-06-01), Regnier et al.
Electrical Design News, "Fast-Charging Systems for Ni-Cd Batteries", David A. Zinder, vol. 15, No. 2, pp. 65-67, Jan. 1978.

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