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High-voltage power supply

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High-voltage power supply


Provided is a high-voltage power supply including a board having at least one bent portion separating a first region of the board from a second region of the board, the first region not being coplanar with the second region of the board; a first circuit, on the first region of the board, generating a second voltage according to a first voltage; and a second circuit, on the second region of the board, amplifying the second voltage and then rectifying the amplified second voltage.

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USPTO Applicaton #: #20120294044 - Class: 363 15 (USPTO) - 11/22/12 - Class 363 


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The Patent Description & Claims data below is from USPTO Patent Application 20120294044, High-voltage power supply.

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CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional application of application Ser. No. 12/406,160, filed Mar. 18, 2009 and claims the benefit of Korean Patent Application No. 2008-72444, filed Jul. 24, 2008, in the Korean Intellectual Property Office, the disclosure of both of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

Aspects of the present general inventive concept relate to a power supply and more particularly, to a high-voltage power supply which generates a high-voltage signal by using a low-voltage signal.

2. Description of the Related Art

An image forming apparatus, such as a laser beam printer (LBP), includes a plurality of devices that electronically operate. Examples of the plurality of devices included in the image forming apparatus include a device for charging a surface of a photoconductive drum, a device for forming an electrostatic latent image on the surface of the photoconductive drum, and a device for transferring the electrostatic latent image onto a printing medium. Power sources for each of the plurality of devices may be different, and are a direct current (DC) high-voltage signal, such as DC 1000 V, equal to or above a predetermined voltage. However, an alternating current (AC) voltage, such as a home AC voltage of 220 Vrms (Volts root mean square) is supplied to the image forming apparatus after being converted to a predetermined DC low-voltage signal, such as DC 5 V, and thus the image forming apparatus includes a high-voltage power supply that generates a plurality of high-voltage signals by receiving a low-voltage signal.

Such a high-voltage power supply is one flat board including a circuit for generating a plurality of high-voltage signals by receiving one low-voltage signal. Here, contacts in the board, specifically, contacts grounded to a contact to which a high-voltage signal is applied, should be spaced apart from each other so as to prevent a spark between the contacts. Accordingly, it is difficult to reduce the size of the board, and thus difficult to apply a conventional high-voltage power supply to small home appliances. The number of circuits arranged on the board of the high-voltage power supply increases as the number of high-voltage signals generated by using one low-voltage signal increases.

SUMMARY

OF THE INVENTION

Aspects of the present general inventive concept provide a high-voltage power supply having a small size, and an electronic device, such as an image forming apparatus, including the high-voltage power supply.

According to an aspect of the present general inventive concept, there is provided a high-voltage power supply including: a board having at least one bent portion separating a first region of the board from a second region of the board, the first region not being coplanar with the second region of the board; a first circuit, on the first region of the board, generating a second voltage according to a first voltage; and a second circuit, on the second region of the board, amplifying the second voltage and then rectifying the amplified second voltage.

According to another aspect of the present general inventive concept, there is provided an image forming apparatus including: a charging unit uniformly charging a surface of a photoconductive drum; a light exposing unit performing light exposure on the surface of the photoconductive drum to form an electrostatic latent image; a developing unit developing the electrostatic latent image using a developer; a transferring unit transferring the developed electrostatic latent image onto a printing medium; a fusing unit fusing the transferred developed electrostatic latent image onto the printing medium; a cleaning unit removing the developer remaining on the photoconductive drum; and a high-voltage power supply supplying power to the charging unit, the light exposing unit, the developing unit, the transferring unit, the fusing unit, and the cleaning unit, wherein the high-voltage power supply includes: a board having at least one bent portion separating a first region of the board from a second region of the board, the first region not being coplanar with the second region of the board; a first circuit, on the first region of the board, generating a second voltage according to a first voltage; and a second circuit, on the second region of the board, amplifying the second voltage and then rectifying the amplified second voltage.

According to another aspect of the present general inventive concept, there is provided an electronic device including: electronic components receiving power; and a high-voltage power supply supplying power, wherein the high-voltage power supply includes: board having at least one bent portion separating a first region of the board from a second region of the board, the first region not being coplanar with the second region of the board; a first circuit, on the first region, generating a second voltage according to a first voltage; and a second circuit, on the second region, amplifying the second voltage and then rectifying the amplified second voltage.

Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects and advantages of the general inventive concept will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a block diagram illustrating an image forming apparatus including a high-voltage power supply, according to an embodiment of the present general inventive concept;

FIG. 2 is a block diagram illustrating a high-voltage power supply according to an embodiment of the present general inventive concept;

FIG. 3 is a diagram for describing a high-voltage power supply according to an embodiment of the present general inventive concept;

FIG. 4 is a schematic diagram for describing a high-voltage power supply according to another embodiment of the present general inventive concept; and

FIG. 5 is a schematic diagram for describing a high-voltage power supply according to another embodiment of the present general inventive concept.



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Industry Class:
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stats Patent Info
Application #
US 20120294044 A1
Publish Date
11/22/2012
Document #
13569358
File Date
08/08/2012
USPTO Class
363 15
Other USPTO Classes
International Class
02M3/22
Drawings
6



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