公开(公告)号：US5914843A

公开(公告)日：1999-06-22

申请号：US984675

申请日：1997-12-03

申请人： William Thomas Hopkins ,  Thomas Eugene Dean

发明人： William Thomas Hopkins ,  Thomas Eugene Dean

IPC分类号： H05B41/285 ,  H02H3/00

CPC分类号： H05B41/2856 ,  H05B41/2851 ,  Y10S315/07

摘要： A power supply power supply circuit of the kind which includes a transformer having primary and secondary windings and an oscillator for driving the primary winding in a bi-directional fashion, suitable for driving gas discharge lighting such as neon signs, which prevents dangerous overvoltage output conditions and detects relatively low level ground fault currents. The transformer includes a clamp winding which is in proximity to and capacitively coupled to the secondary winding. The terminals of the clamp winding are connected to a current imbalance detection circuit for detecting imbalance between the current flowing into one clamp winding terminal and the current out of the other clamp winding terminal. In a ground fault condition, ground fault current flows in an unbalanced fashion into the clamp winding terminal(s), and through the capacitive coupling to the secondary winding. This ground fault current is detected by the current imbalance detection circuit, causing the current imbalance detection circuit to generate an electrical signal indicative of ground fault current, which shuts down the oscillator.

摘要翻译： 一种电源电源电路，其包括具有初级和次级绕组的变压器和用于以双向方式驱动初级绕组的振荡器，其适于驱动诸如霓虹灯的气体放电照明，其防止危险的过电压输出条件 并检测相对低电平的接地故障电流。 变压器包括钳位绕组，该钳位绕组接近并电容耦合到次级绕组。 夹紧绕组的端子连接到电流不平衡检测电路，用于检测流入一个钳位绕组端子的电流与另一个钳位绕组端子之间的电流之间的不平衡。 在接地故障条件下，接地故障电流以不均衡的方式流入钳位绕组端子，并通过与次级绕组的电容耦合。 该接地故障电流由电流不平衡检测电路检测，导致电流不平衡检测电路产生指示接地故障电流的电信号，从而关闭振荡器。