| 摘要 |
Power saving circuit of a power factor adjusting type, including a rectifying and smoothing part for rectifying, and smoothing an AC power into a DC voltage, a transformer connected to an output terminal on the rectifying and smoothing part for boosting the DC voltage to a level in proportion to a winding ratio thereof, a plurality of field effect transistors each connected to the rectifying and smoothing part and a ground terminal of the transformer for switching the DC voltage, and a voltage cutting off part connected to a gate terminal of the field effect transistor and a rectified voltage output terminal on the transformer for cutting off voltage generation in a primary winding and a secondary winding by means of photocoupler on reception of a control signal in a DPM mode, whereby complying with the standards both of the U.S.A and the Europe for a DPM mode by reducing a power consumption in the primary winding of a transformer in a DPM mode of a monitor and allowing the circuit to be produced at a low cost because no additional serve power is required for the DPM mode. |
