H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/27, 321/90
H02M 3/335 (2006.01) H02M 7/217 (2006.01)
Patent
CA 1294671
DOUBLE-SWITCHED FLYBACK POWER-CONVERTER ABSTRACT A double-switched flyback power-converter has a primary winding of a power transformer connected between the output terminals of a high voltage DC power supply. A first switch is connected between the positive terminal of the power supply and a first end of the primary winding. A second switch is connected between the negative terminal of the power supply and a second end of the primary winding. During a primary conduction cycle, a current monitor senses the primary winding current and signals a control logic circuit at a predetermined current level. The control logic circuit turns off the second switch, forcing the power transformer in o a flyback cycle. During the flyback cycle, energy stored in the primary winding of the power transformer is coupled over to the secondary windings. A major portion of the energy goes to a power output circuit, where it is rectified and filtered for output power use. The remainder of the energy is transferred to a charge pumping cicuit at each switch. When the stored energy formed by the primary winding is depleted, the charge pumping circuits pump charge into the switches. The switches turn on, returning the double-switched flyback power converter to the primary conduction cycle.
606985
Compaq Computer Corporation
Finlayson & Singlehurst
LandOfFree
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