Current control circuit for a plurality of loads

Details Current control circuit for a plurality of loads Current control circuit for a plurality of loads

1982-08-17

1985-02-19

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323272, 318341, H02P 516, G05F 156

Patent

active

045008302

ABSTRACT:
An electronic circuit for switching and controlling a current flowing through a plurality of loads has a feedback loop so that the current is proportional to a reference signal irrespective of an unbalance and a variation of h.sub.FE values of current amplifying transistors. A capacitor for preventing any oscillation in the feedback loop is connected between an output terminal of a current detector and a comparator so that 0 dB frequency, at which the absolute value of the open loop gain of the feedback loop becomes 1 (0 dB), is constant irrespective of an unbalance and a variation of h.sub.FE values of the current amplifying transistors in mass production. When the circuit is used to control an electronically commutated motor, a motor generating a smooth and constant torque can be easily obtained.

REFERENCES:
patent: Re24671 (1959-07-01), Jensen
patent: 3723774 (1973-03-01), Rogers
patent: 3735240 (1973-05-01), Davis et al.
patent: 4359674 (1982-11-01), Gotou

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