| 摘要 |
A switching-type regulating power supply which dissipates little power, minimizes radio frequency interference, and provides a constant DC output voltage has a full-wave rectifier with a regulating means in its common return circuit to switch the full-wave rectified current supplied to an output filter on and off. The current is switched on when there is zero voltage across the full-wave rectifier thus minimizing radio-frequency-interference-causing surge currents, and this is accomplished by a phase synchronizer which is coupled to the input terminals of the full-wave rectifier and also coupled to the control means which applies a variable duty cycle control voltage to the regulating means. The control means is coupled to the output voltage filter and generates a variable duty cycle control voltage in response to changes in the DC output voltage of the supply. This varying duty cycle control voltage is applied to the regulating means to control the time in which the regulating means allows current to flow to the output filter which results in output voltage stabilization.
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