Importance

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Abstract

A capacitor-charging series resonant mode, high voltage power supply (SRMPS) (10) includes a switching network (30) that alternately applies a positive and negative voltage to a series resonant circuit, comprising a resonant capacitor and inductor. The inductor may include the primary winding (14) of a power transformer (12). The switching action occurs at a fixed frequency above the audible range. This frequency is approximately the resonant frequency of the series resonant circuit. The switching action causes sine wave quantums of current of alternating phase to flow through the primary winding. Secondary windings (16) of the transformer are coupled through a suitable rectifying network (18) to charge a load capacitor C.sub.L to a high voltage. During a first mode of operation the load capacitor is charged at a maximum rate. During a second mode, the load capacitor is charged only as needed to maintain a desired charge thereon. Switching between the two modes occurs automatically depending upon the capacitive load requirements. The first mode operates with a control loop open, and is used when initially charging the load capacitor. The second mode operates with the control loop closed, at a low duty cycle, and allows only a small sliver of the front end of the sine wave current quantum to flow through the primary winding.

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First Claim