Solenoid driver control unit

Details Solenoid driver control unit Solenoid driver control unit

1985-09-23

1987-07-14

Gellner, Michael L.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

123490, F02D 4130, H01H 4732

Patent

active

046806679

ABSTRACT:
A solenoid driver control circuit for use with solenoids, the circuit including a current sense unit (12) for providing a current sense signal and a solenoid drive unit (13) for selectively allowing current to flow through the solenoid (11) from a power source (14). The circuit also includes a threshold comparator unit (17) for comparing threshold signals with the current sense signal and for providing an output signal that can control the solenoid drive unit (13), a minimum threshold unit (18) for providing a minimum threshold, a maximum threshold unit (19) for initially providing a maximum threshold until a peak current flow through the solenoid (11) has been established, a first timing unit (21) to periodically provide increased threshold signals for specified durations of time, and a second timing unit (41) for initially providing an increased minimum threshold signal at the outset of a control cycle. The device provides a minimum current flow through the solenoid (11) at all times during a control cycle and utilizes time control to realize the desired solenoid current waveform.

REFERENCES:
patent: 4327394 (1982-04-01), Harper
patent: 4605983 (1986-08-01), Harvey

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