SWITCH CONTROL DEVICE AND METHOD FOR POWER

摘要

A switch control device includes a switch device and a control device. The switch device includes first and second input terminals, an output terminal, a processor, and a plurality of delays. The processor is configured to detect period of an input voltage from the first input terminal, and to determine whether the input voltage is normal. A delay time can be computed by the processor, according to the period of the input voltage and a release time of the each delay. If the input voltage from the first input terminal is abnormal, the processor detects a zero voltage crossing signal or a peak of voltage signal, and delays the zero voltage crossover signal or the peak of voltage signal for a delay time, to control the delays coupled to the first input terminal to turn off. Therefore, an arc discharge resulted by the relay can be avoid or reduce.

主权项

1. A switch control device comprising:
a switch device comprising a first input terminal, a second input terminal, a first switch unit, a second switch unit, and an output terminal receiving a first input voltage from the first input terminal through the first switch unit or a second input voltage from the second input terminal through the second switch unit, each switch unit comprising a plurality of relays; a control device comprising:
a detection unit coupled to the first and second input terminal and configured to detect a zero crossover signal of the first input voltage or the second input voltage;a processor coupled to the detection unit, the first switch unit, and the second switch unit, wherein the processor is configured to:
receive the first or second input voltage and the zero crossover signal of the first or second input voltage;detect a period of the first or second input voltage;determine whether the first or second input voltage is normal or not;when the first input voltage from the first input terminal is abnormal, compute a delay time according to the period of the first input voltage and a discharge time of relays of the first switch unit; and control the relays of the first switch unit to turn off according to the delay time and the zero crossover signal of the first zero crossover signal of the first input voltage.