Constant current relay drive circuit
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United States of America Patent
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Issued Date -
Jun 29, 2006
app pub date -
Dec 15, 2005
filing date -
Dec 28, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A relay drive circuit includes a power supply circuit for producing a constant voltage, an initial energization circuit for performing an initial energization such that a power supply provides an initial energizing voltage to a relay, a low-holding energization circuit for performing a low-holding energization such that the constant voltage provides a constant current to the relay after the initial energizattion. Due to the low-holding energization, the relay contact can be firmly held even when relay coil resistance changes. The constant voltage for performing the low-holding energization is lower than the power supply voltage so that power consumption and heat generation can be reduced.
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