Wide input voltage range relay drive circuit for universal...

Details Wide input voltage range relay drive circuit for universal... Wide input voltage range relay drive circuit for universal...

2007-07-17

2007-07-17

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

C361S091100

Reexamination Certificate

active

11403426

ABSTRACT:
A wide input voltage range relay drive circuit allowing a more than 2:1 input voltage variation is provided. The circuit utilizes a scaled and rectified bulk voltage to drive the relay coil. As the monitored bulk voltage increases beyond the relay coil rated voltage, the circuit pulse width multiplexes this bulk voltage to protect the relay coil. The bulk voltage switching does not begin, however, until the relay energizes. To reduce the power dissipation during the PWM switching, of the relay coil, a power dissipating switch is included and held on during the PWM switching events. To further increase relay life, the circuit controls the energizing of the relay coil to actuate the contacts of the relay at or near a zero cross of the power switched thereby.

REFERENCES:
patent: 4744231 (1988-05-01), Takagi et al.
patent: 4959746 (1990-09-01), Hongel
patent: 5001623 (1991-03-01), Magid
patent: 5304781 (1994-04-01), Stalsberg
patent: 6598604 (2003-07-01), Seakins
patent: 6671142 (2003-12-01), Beckert et al.

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