Bi-mode high voltage resonant power supply

Details Bi-mode high voltage resonant power supply Bi-mode high voltage resonant power supply

H - Electricity

02

M

H02M 7/12 (2006.01) H02M 3/337 (2006.01)

Patent

CA 2059241

ABSTRACT OF THE DISCLOSURE A capacitor-charging series resonant mode, high voltage power supply (SRMPS) (10) operates in one of two modes as controlled by a control circuit (36). The SRMPS includes a switching network (30) that alternately applies a positive and negative voltage to a series resonant circuit that includes the primary winding (14) of a power transformer (12). The switching action occurs at a fixed frequency above the audible range that 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 CL to a high voltage. During a first mode of operation, the load capacitor is charged at a maximum rate. During a second mode of operation, 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 of the SRMPS. 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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