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US 6,759,766 B2Granted
Power supply apparatus and image forming apparatus using the same
AssigneeFuji Xerox Co., Ltd.
InventorsMasashi Hiratsuka, Kunihiro Takahashi, Yoshinao Kondoh
Life of this patent
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Abstract
A power supply apparatus includes a boost circuit and a switch circuit. The boost circuit has rectifying elements and charge storage elements associated with the rectifying elements, and outputs a boosted voltage by sequentially cumulating charges in the charge storage elements in accordance with an AC input signal. The switch circuit switches a polarity of boosting in cumulating the charges in the charge storage elements. The boost circuit includes a circuit part that supplies charges to be sequentially cumulated in positive and negative directions in accordance with the AC input signal.
Claims21
A power supply apparatus comprising:
- a boost circuit that has rectifying elements and charge storage elements associated with the rectifying elements and outputs a boosted voltage by sequentially cumulating charges in the charge storage elements in accordance with an AC input signal;
- and
- a switch circuit that switches a polarity of boosting in cumulating the charges in the charge storage elements,
- the boost circuit including a circuit part that supplies charges to be sequentially cumulated in positive and negative directions in accordance with the AC input signal.
1 more element
A power supply apparatus comprising:
- a boost circuit having unit circuits connected in a ladder formation, each of the unit circuits including two rectifying elements and one charge storage element;
- and
- a switch circuit interchanging connections of an AC input signal and a load to input and output terminals of the boost circuit,
- the boost circuit including a first charge storage circuit connected between ground and one of the unit circuits located at a first stage in a positive direction and a second charge storage circuit connected between the ground and another one of the unit circuits located at a first stage in a negative direction.
1 more element
A power supply apparatus comprising:
- a boost circuit having 2n rectifying elements connected forwardly from a first terminal to a second terminal (1≦n), each of the 2n rectifying elements having first and second ends, and having charge storage elements provided so as to connect the first end of the (2i+1)th rectifying element and the second end of the (2i+2)th rectifying element (0≦i≦n−1) and to connect the second end of the (2i+1)th rectifying element and the second end of the (2i+3)th rectifying element (0≦i≦n−2), the second ends of the first and (2n−1)th rectifying elements being grounded via respective charge storage elements;
- and
- a switch circuit that interchanges connections of an AC input signal and a load to the first and second terminals of the boost circuit.
A power supply apparatus comprising:
- a positive-side boost circuit including first rectifying elements, first charge storage elements, and a first circuit part that supplies charges to be sequentially cumulated in the first charge storage elements in accordance with an AC signal;
- a negative-side boost circuit including second rectifying elements, second charge storage elements, and a second circuit part that supplies charges to be sequentially cumulated in the second charge storage elements in accordance with the AC signal;
- and
- a switch circuit that selectively supplies a load with one of outputs of the positive-side and negative-side boost circuits in accordance with a given sequence.
1 more element
A power supply apparatus comprising:
- a positive-side boost circuit having 2n rectifying elements connected forwardly from a first terminal to a second terminal (1≦n), each of the 2n rectifying elements having first and second ends, and having charge storage elements provided so as to connect the first end of the (2i+1)th rectifying element and the second end of the (2i+2)th rectifying element (0≦i≦n−1) and to connect the second end of the (2i+1)th rectifying element and the second end of the (2i+3)th rectifying element (0≦i≦n−2), the second end of a first rectifying element in a positive direction being grounded via a first charge storage circuit;
- a negative-side boost circuit having 2n rectifying elements connected reversely from the first terminal to the second terminal (1≦n), each of the 2n rectifying elements of the negative-side boost circuit having third and fourth ends, and having charge storage elements provided so as to connect the third end of the (2i+1)th rectifying element and the fourth end of the (2i+2)th rectifying element (0≦i≦n−1) and to connect the fourth end of the (2i+1)th rectifying element and the fourth end of the (2i+3)th rectifying element (0≦i≦n−2), the fourth end of a first rectifying element in a negative direction being grounded via a second charge storage circuit;
- and
- a switch circuit that selectively supplies outputs of the positive-side and negative-side boost circuits to a load.
1 more element
An image forming apparatus comprising:
- an image forming part;
- and
- a power supply apparatus supplying drive power to the image forming part,
- the power supply apparatus comprising:
- a boost circuit having rectifying elements and charge storage elements associated with the rectifying elements and outputting a boosted voltage by sequentially cumulating charges in the charge storage elements in accordance with an AC input signal;
- and
- a switch circuit switching a polarity of boosting in cumulating the charges in the charge storage elements,
- the boost circuit including a circuit part that supplies charges to be sequentially cumulated in positive and negative directions in accordance with the AC input signal.
5 more elements
Dependencies are inferred from the claim text.