Dual current sensing driver circuit

Details Dual current sensing driver circuit Dual current sensing driver circuit

1989-12-26

1990-10-30

Beha, Jr., William H.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

318432, 323287, 361187, G05F 1575

Patent

active

049673092

ABSTRACT:
A driver circuit for an inductive load, such as a solenoid winding, includes flyback and energization current sensors which respectively sense the current through the coil during flyback and energization. The flyback current sensor includes a flyback current resistor disposed in the flyback current path of the winding for producing a flyback signal proportional to the flyback current. The energization current sensor includes an energization current resistor disposed within the energization current path of the winding. The energization current resistor is adapted to produce an energization signal in response to the energization current flowing through the winding. Control of the solenoid winding is effected by a switch which connects and disconnects the winding from a power source in response to the duty factor of a control signal. A first summing amplifier receives the flyback and energization signals and produces an actual current signal in response to the received signals. A second summing amplifier receives the actual current signal and a desired current signal and produces an error signal in response to a difference between the actual and desired current signals. A first comparator receives the error signal and produces the control signal responsive to the error signal, wherein the duty factor of the control signal is responsive to the magnitude of error signal. The duty factor of the control signal is constantly adjusted in this manner to maintain the solenoid current at the desired level.

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"Advances in Spacecraft Power Conditioning--New Concepts from Old", (ESA Journal, 1977, vol. 1, No. 4).

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