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US 7,002,816 B2Granted
Power supply apparatus and image forming apparatus using the same
AssigneeFuji Xerox Co., Ltd.
InventorsMasashi Hiratsuka, Kunihiro Takahashi
Life of this patent
Estimating the term…
Abstract
A power supply apparatus includes first and second switching elements respectively controlled by first and second clock signals, a first parallel resonance circuit connected between the first switching element and a dc power supply, a second parallel resonance circuit connected between the second switching element and the dc power supply, and a series resonance circuit connected between the first and second parallel resonance circuits. An output voltage of the power supply circuit is obtained from a node in the series resonance circuit.
Claims15
A power supply apparatus comprising:
- first and second parallel resonance circuits, each having first and second terminals;
- a first switching element that is connected to the second terminal of the first parallel resonance circuit and forms a first parallel resonance circuit part together with the first parallel resonance circuit;
- a second switch element that is connected to the second terminal of the second parallel resonance circuit and forms a second parallel resonance circuit part together with the second parallel resonance circuit;
- and
- a series resonance circuit having a first end connected to the second terminal of the first parallel resonance circuit and a second end connected to the second terminal of the second parallel resonance circuit,
- the first terminals of the first and second parallel resonance circuits being coupled to a DC power supply provided in common thereto,
- the first and second switching elements being alternately turned on and off in accordance with control signals externally supplied.
4 more elements
A power supply circuit comprising:
- first and second switching elements respectively controlled by first and second clock signals;
- a first parallel resonance circuit having first and second terminals, the first switching element connected to the second terminal of the first parallel resonance circuit and a DC power supply connected to the first terminal of the first parallel resonance circuit;
- a second parallel resonance circuit having first and second terminals, the second switching element connected to the second terminal of the second parallel resonance circuit and the DC power supply connected to the first terminal of the second parallel resonance circuit, the DC power supply provided in common to the first and second parallel resonance circuits;
- and
- a series resonance circuit having a first end connected to the second terminal of the first parallel resonance circuit and having a second end connected to the second terminal of the second parallel resonance circuit,
- an output voltage of the power supply circuit being obtained from a node in the series resonance circuit.
3 more elements
An image forming apparatus comprising:
- an image forming part;
- and
- a power supply apparatus that supplies power to the image forming part,
- the power supply apparatus comprising:
- first and second parallel resonance circuits, each having first and second terminals;
- a first switching element that is connected to the second terminal of the first parallel resonance circuit and forms a first parallel resonance circuit part together with the first parallel resonance circuit;
- a second switch element that is connected to the second terminal of the second parallel resonance circuit and forms a second parallel resonance circuit part together with the second parallel resonance circuit;
- and
- a series resonance circuit having a first end connected to the second terminal of the first parallel resonance circuit and a second end connected to the second terminal of the second parallel resonance circuit,
- the first terminals of the first and second parallel resonance circuits being coupled to a DC power supply provided in common thereto,
- the first and second switching elements being alternately turned on and off in accordance with control signals externally supplied.
8 more elements
A power supply apparatus comprising:
- first and second parallel resonance circuits;
- a first switching element that is connected to the first parallel resonance circuit and forms a first parallel resonance circuit part together with the first parallel resonance circuit;
- a second switch element that is connected to the second parallel resonance circuit and forms a second parallel resonance circuit part together with the second parallel resonance circuit;
- and
- a series resonance circuit having a first end connected to an end of the first parallel resonance circuit part and a second end connected to an end of the second parallel resonance circuit part,
- the first and second switching elements being alternatively turned on and off in accordance with control signals externally supplied in order to alternately connect the first and second ends to a reference potential defined in common to the first and second parallel resonance circuits.
3 more elements
Dependencies are inferred from the claim text.