Wide input voltage range relay drive circuit for universal defrost timer
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United States of America Patent
Stats
-
Jul 17, 2007
Grant Date -
Oct 19, 2006
app pub date -
Apr 13, 2006
filing date -
Apr 14, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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