PWM relay actuator circuit

Details PWM relay actuator circuit PWM relay actuator circuit

1998-03-06

1999-07-27

Gaffin, Jeffrey

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361156, 361190, H01H 4728

Patent

active

059301040

ABSTRACT:
An actuation circuit for an electromechanical relay employs a microprocessor and a switching transistor to actuate a relay over a wide range of applied voltages. The switching transistor is connected in series with the actuator coil. A voltage sensing circuit is connected to one input of the microprocessor, which produces a pulse-width modulated actuator output to gate the switching transistor. The microprocessor is suitably programmed so as to produce a pulse width modulated signal actuator signal whose duty cycle is a function of applied voltage. The RMS current through the relay coil is sufficient to ensure good actuation, but does not overstress the coil. The relay is selected to have its rated actuation voltage at or below a lower end of the expected range of applied voltages. A relay actuation boost arrangement can include a transistor or an SUS (silicon unidirectional switch) or similar negative resistance device.

REFERENCES:
patent: 3676601 (1972-07-01), Shaffer
patent: 4266261 (1981-05-01), Streit et al.
patent: 4639822 (1987-01-01), Kubach et al.
patent: 5343351 (1994-08-01), Quantz
patent: 5381297 (1995-01-01), Weber
patent: 5430600 (1995-07-01), Burns
patent: 5558065 (1996-09-01), Arakawa
patent: 5717562 (1998-02-01), Antone et al.

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