| 摘要 |
A power supply circuit uses a simplified design for converting AC to DC and powering a flyback transformer. The switch of the flyback transformer operates at a high frequency and the time of the transformer is controlled to achieve a high power factor. The flyback transformer is fed a rectified AC signal which has not been smoothed in the traditional manner using a bulk hold-up capacitor and in rush limiting resister. Any filtering to smooth the output current or voltage is carried out on the secondary side. In some cases, no smoothing of the output current or voltage is necessary. The time on of the switch is changed if necessary, slowly, relative to the pulsating input signals powering the primary winding. With a fixed Ton, or slowly varying Ton, a high input power factor can be achieved.
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