Solenoid driver control circuit with initial boost voltage

Details Solenoid driver control circuit with initial boost voltage Solenoid driver control circuit with initial boost voltage

1986-10-02

1988-03-01

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361154, 361194, H01H 4732

Patent

active

047290560

ABSTRACT:
An improved solenoid driver control circuit is disclosed in which solenoid current is sensed and provided as an input to a comparator means comprising two separate comparators (24, 25). The comparator means receives a solenoid current sense signal (45) and maximum and minimum reference threshold levels which determine maximum and minimum current limits (I.sub.max, I.sub.min ; H.sub.max, H.sub.min) for solenoid current during initial pull-in excitation and subsequent hold excitation. Pull-in time (T.sub.1) is defined by a monostable multivibrator (33) reacting to a control pulse (41) to produce a predetermined pull-in time pulse (43) such that the pull-in time is independent of sensed solenoid current. During pull-in time a boost driver switch (53) applies high boost voltage to a power source terminal (16) which supplies solenoid current, and in response to achieving the maximum pull-in current limit (I.sub.max) lower battery voltage is provided at the power source terminal. If the maximum pull-in current limit does not occur within a predetermined time (t.sub.b1) after pull-in initiation (at t.sub.0), then the lower battery voltage is applied to the power source terminal at that time. The above configuration insures rapid initial solenoid response while minimizing power dissipation and circuit stress.

REFERENCES:
patent: 4112477 (1978-09-01), Sherwin
patent: 4300508 (1981-11-01), Streit et al.
patent: 4338651 (1982-07-01), Henrich
patent: 4417201 (1983-11-01), Reddy
patent: 4479161 (1984-10-01), Henrich et al.
patent: 4486703 (1984-12-01), Henrich
patent: 4605983 (1986-08-01), Harvey

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