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

H - Electricity – 01 – H

Patent

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H01H 47/00 (2006.01)

Patent

CA 2604667

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.

L'invention concerne un circuit excitateur de relais à gamme de tensions d'entrée large permettant d'obtenir une variation au niveau de la tension d'entrée supérieure à 2:1. Ce circuit utilise une tension brute mise à l'échelle et redressée pour exciter la bobine de relais. Si la tension brute surveillée dépasse la tension nominale de la bobine de relais, la largeur d'impulsion du circuit multiplexe la tension brute pour protéger la bobine de relais. La commutation au niveau de la tension brute ne se fait pas, cependant, tant que le relais n'est pas excité. Pour réduire la dissipation d'énergie durant la commutation par MIL, de la bobine de relais, un commutateur dissipateur d'énergie est utilisé et maintenu actif durant les événements de commutation par MIL. Pour prolonger encore la durée de vie du relais, le circuit contrôle l'excitation de la bobine de relais pour actionner les contacts du relais à proximité d'un passage à zéro ou à un passage à zéro de la commutation d'énergie.

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