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1. 发明授权

US5892646A Ground fault protection of gas lamp power supplies 失效
标题翻译：燃气灯电源接地故障保护
公开(公告)号：US5892646A
公开(公告)日：1999-04-06
申请号：US851451
申请日：1997-05-05
申请人： Francis J. Parker , Emilian Padurariu , Richard Crawbuck
发明人： Francis J. Parker , Emilian Padurariu , Richard Crawbuck
IPC分类号： H02H3/16 , H05B41/285 , H02H3/00
CPC分类号： H05B41/2851 , H02H3/16
摘要： A power supply for powering a neon sign assembly includes a ground fault detection circuit having a current sensing circuit that produces a voltage that is proportional to the current that flows from a center tap of an output transformer, a phase-sensitive rectifier that receives output from the current sensing circuit and a reference voltage from the transformer and produces an output voltage that depends on the magnitude of the output from the current sensing circuit and the phase angle between the output from the current sensing circuit and the reference voltage, and an amplitude comparator that produces an output to a latch circuit only when an output voltage from the phase-sensitive rectifier is equal to or greater than a pre-set ground fault current limit.
摘要翻译：用于为霓虹灯组件供电的电源包括接地故障检测电路，其具有电流感测电路，该电流感测电路产生与从输出变压器的中心抽头流出的电流成比例的电压;相敏整流器，其接收来自电流检测电路和来自变压器的参考电压，并产生取决于电流检测电路的输出的幅度和电流检测电路的输出与参考电压之间的相位角的输出电压，以及幅度比较器仅当来自相敏整流器的输出电压等于或大于预设的接地故障电流限制时才产生到锁存电路的输出。

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