H - Electricity
02
M
H02M 3/335 (2006.01) H02M 3/337 (2006.01) H02M 7/523 (2006.01)
Patent
CA 2314191
There is provided a switching power supply having low loss. In a power supply of the present invention, two sub switching elements connected in series are then connected in parallel with a bridge circuit, and a resonance coil and a sub primary winding are connected between a connection point of the series connection circuits and an output terminal of the bridge circuit. Resonance capacitors are respectively connected in parallel with each main switching element constituting the bridge circuit, so as to resonate with the resonance coil. Voltages across the two ends of A phase and B phase sub secondary windings magnetically coupled to the sub primary winding are clamped to the supply voltage, a fixed voltage in proportion to the turns ratio is generated in the sub primary winding, a voltage applied to the resonance coil becomes small and current fluctuation becomes small. Also, with the power supply of the present invention, two sub switching elements connected in series are then connected in parallel with a main bridge circuit, and a resonance coil and auxiliary primary winding are connected between a connection point C of the series connection circuits and an output terminal B of the main bridge circuit. Resonance capacitors are respectively connected in parallel with each main switching element constituting the main bridge circuit. The auxiliary primary winding is magnetically coupled to a main primary winding H-bridge connected to the main bridge circuit, the main bridge circuit is controlled during resonance of the resonance coil, and the resonance is terminated using a voltage induced in the auxiliary primary winding.
Endo Taisuke
Matsuda Yoshiaki
Gowling Lafleur Henderson Llp
Shindengen Electric Manufacturing Co. Ltd.
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