Switching power supply device and projection video display device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorTsuyoshi YAMAJI
Life of this patent
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Abstract
A switching power supply device includes a transformer which includes a secondary winding divided into a plurality of winding units, a resonant capacitor, and a first switching element and a second switching element. Further, the switching power supply device includes a plurality of rectifier diodes which extracts voltages induced to the secondary winding in the winding units, an output voltage switching circuit which switches the voltages extracted from the plurality of rectifier diodes and outputs a switched voltage, a current detection circuit which detects a current flowing in a load circuit, and a controller which controls the output voltage switching circuit based on a detection result of the current detection circuit.
Claims8
A switching power supply device comprising:
- a transformer which includes a primary winding and a secondary winding divided into a plurality of winding units;
- a resonant capacitor which forms a resonant circuit including the primary winding as a component;
- a first switching element and a second switching element which are provided at a side of the primary winding;
- a plurality of rectifier diodes which extracts voltages induced to the secondary winding in the winding units;
- an output voltage switching circuit which switches the voltages extracted from the plurality of rectifier diodes and outputs a switched voltage;
- a current detection circuit which detects a current flowing in a load circuit;
- and
- a controller which controls the output voltage switching circuit based on a detection result of the current detection circuit.
A projection video display device comprising:
- a light source;
- and
- a switching power supply device which supplies power to the light source,
- wherein the switching power supply device includes
- a transformer which includes a primary winding and a secondary winding divided into a plurality of winding units;
- a resonant capacitor which forms a resonant circuit including the primary winding as a component;
- a first switching element and a second switching element which are provided at a side of the primary winding;
- a plurality of rectifier diodes which extracts voltages induced to the secondary winding in the winding units;
- an output voltage switching circuit which switches the voltages extracted from the plurality of rectifier diodes and outputs a switched voltage;
- a current detection circuit which detects a current flowing in the light source;
- and
- a controller which controls the output voltage switching circuit based on a detection result of the current detection circuit.
Dependencies are inferred from the claim text.