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    • 2. 发明授权
    • 기계적 스위치용 아크 방지 회로
    • 기계적스위치용아크방지회로
    • KR100452709B1
    • 2004-12-30
    • KR1019970057697
    • 1997-11-03
    • 허브벨 인코포레이티드
    • 니시하라토마스에스.블로데이비드에이.칼레보타스테펀에이.
    • H01H9/30
    • H01H9/56H01H2009/566Y10T307/839Y10T307/858Y10T307/951
    • A device for controlling a switching relay to deliver power to a load. The switching relay selectively couples a hot leg of a utility power supply to the load. The load is coupled to a neutral wire of the utility power supply. The device includes a sensor for detecting whether an area is occupied. If the sensor indicates that the area is occupied and the load is powered off, the device monitors the line voltage for a zero crossing. Upon detecting a zero crossing, an amount of time to a subsequent zero crossing is measured and stored. Then, the device waits the amount of time between zero crossings, less a delay time for closing the contacts of the relay, and initiates a closing of the contacts of the relay. Similarly, when the sensor detects that the area has not been occupied for a predetermined amount of time and the load is powered on, the line voltage is monitored for a zero crossing and a time to a subsequent zero crossing is measured and stored. Then, the device waits the amount of time between zero crossings, less a delay time for opening the contacts of the relay, and initiates an opening of the contacts of the relay. Accordingly, when the relay contacts actually close or open, the line voltage is at the ground level. Therefore, even if the load has a high in-rush current or high kick-back power, the relay contacts are not likely to be damaged.
    • 一种控制开关继电器向负载供电的装置。 开关继电器选择性地将公用电源的热支路耦合到负载。 负载耦合到公用电源的中性线。 该装置包括用于检测区域是否被占用的传感器。 如果传感器指示该区域已被占用并且负载断电,则该设备将监测线路电压是否过零。 在检测到零交叉时,测量并存储到随后零交叉的时间量。 然后,该设备等待零交叉点之间的时间量,缩短关闭继电器触点的延迟时间,并启动关闭继电器触点。 类似地,当传感器检测到该区域未被占用达预定时间量并且负载通电时,线电压被监控为零交叉,并且测量并存储到随后过零点的时间。 然后,该设备等待零交叉之间的时间量,减去打开继电器触点的延迟时间,并启动继电器触点的打开。 因此,当继电器触点实际闭合或断开时,线路电压处于地电平。 因此,即使负载具有高冲击电流或高反冲功率,继电器触点也不可能被损坏。