| 摘要 |
PURPOSE:To control leakage current to prevent electric shock accidents by connecting an unbalance-balance converting circuit to the output end of an inverter circuit on the primary side and a balance-unbalance converting circuit to the receiving end on the secondary side. CONSTITUTION:When a switching circuit 14 is turned on/off by applying pulses generated from a pulse generating circuit 15, high-frequency voltage is generated in the primary winding 12 of a transformer. High-frequency voltage in the same direction as the high-frequency voltage of the primary winding 12, is generated in the winding 18A of an unbalance-balance converting circuit 18, and that in the reverse direction is generated in the winding 18B. Further, high-frequency voltage in the direction reverse to that of high-frequency voltage of the winding 18A, is generated in the winding 19A of a balance-unbalance converting circuit 19, and that in the direction reverse to that of high-frequency voltage of the winding 18B is generated in the winding 19B. High-frequency voltage in the same direction as that of the primary winding 12, generated in the secondary winding 22, is rectified through a diode rectifier circuit 26, and smoothed by means of a coil 27 and a capacitor 28. The smoothed high-frequency voltage is then supplied to a load 29. This enables currents in the direction reverse to each other to pass through capacitors 20A, 20B. As a result high-frequency currents cancel each other out, and thus leakage current is controlled. |
