Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Power supply apparatus and image forming apparatus

一种电源装置、图像的技术，应用在应用电荷图形的电记录工艺、应用电荷图形的电记录工艺的设备、输出功率的转换装置等方向，能够解决FETQ101振荡频率变低等问题

Active Publication Date: 2019-12-17
CANON KK
View PDF18 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, in the case where the voltage at the output terminal 1 is low, the oscillation frequency of the FET Q101 becomes low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power supply apparatus and image forming apparatus
  • Power supply apparatus and image forming apparatus
  • Power supply apparatus and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] The power supply device of the present invention is applied to, for example, an image forming apparatus. Therefore, first, a laser printer as a type of image forming apparatus will be described.

[0027] [Configuration of Image Forming Apparatus]

[0028] figure 1 A cross-sectional view of a monochrome laser printer (hereinafter referred to as a printer) 100 in Example 1 is illustrated. The printer 100 includes a sheet feeding unit 101, a laser scanner 102 as an exposure device, a toner tank 103, a developing roller 104 as a developing device, a photosensitive drum 105 as a photosensitive member, a transfer roller 106 as a transfer device, A charging roller 107 and a waste toner tank 108 . Further, the printer 100 includes a fixing roller 109 , a pressure roller 110 , a discharge unit 111 , a conveying path 112 , and a developing blade 114 . The sheet feeding unit 101 is a sheet feeding unit that stores recording media (for example, paper P) on which printing is to...

example 3

[0052] [Setting of pulse signal and PWM signal]

[0053] In Examples 1 and 2, it has been described that the frequency or duty cycle of the pulse signal input to the input terminal 1 is changed according to the voltage value to be output or the assumed load. However, the frequency or duty cycle of the pulse signal input to the input terminal 1 can be changed according to the time-varying load.

[0054] E.g, figure 1 The printer 100 in forms an image in a series of operations, as shown in Example 1. Therefore, for example, the timing at which the fed paper P contacts the photosensitive drum 105 can be predicted. Since the paper P, which is a resistor, enters the position where the transfer roller 106 and the photosensitive drum 105 were in contact with each other before then, it looks like the load resistance becomes high at this time from the viewpoint of the high-voltage power supply. Note that the load at this time refers to the transfer load. As described above, the ri...

example 4

[0058] [Setting of pulse signal and PWM signal]

[0059] There are other situations where it is advantageous to vary the frequency of the pulse signal input to input 1 . For example, by temporarily increasing the frequency of the pulse signal when the output voltage rises, the time to reach the target voltage can be shortened. The situation is Figure 5A with Figure 5B shown in . Figure 5A shows the time variation of the output voltage, Figure 5B The time variation of the frequency of the pulse signal input to the input terminal 1 is illustrated. Figure 5A Also illustrated are times T1 and T2 when both output voltages rise to the target voltage. The two time axes are the same, and the one-dot chain line indicates the same timing t1. Also, a solid line indicates a case where the frequency of the pulse signal input to the input terminal 1 is fixed at 5 kHz, and a thick dashed line indicates a case where the pulse signal moves at double frequency (ie, 10 kHz) for a peri...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a power supply apparatus and an image forming apparatus. The power supply apparatus includes a switching element configured to drive a transformer, a primary side and a secondary side of the transformer being insulated from each other, a control unit configured to output a pulse signal for driving the switching element, and a comparing unit configured to compare a target voltage of an output voltage that is output from the secondary side of the transformer and the output voltage, and to control the output voltage to be the target voltage, wherein the comparing unit cutsoff an input of the pulse signal to the switching element in a case where the output voltage is larger than the target voltage, and wherein the control unit determines a frequency or an on-duty ratioof the pulse signal according to the target voltage.

Description

technical field [0001] The present invention relates to a power supply device and an image forming device. In particular, the present invention relates to various high-voltage power supplies required in an image forming device of an electrophotographic system. Here, the image forming apparatus includes, for example, copiers, laser printers, LED printers, and electrophotographic facsimiles. Background technique [0002] Conventionally, an image forming device of an electrophotographic system that reproduces an image on recording paper by using an electrophotographic technique has been widely used. The image forming device irradiates light such as laser light onto a photosensitive member uniformly charged to a positive or negative high potential according to an image to be reproduced, and forms a latent image on the photosensitive member using electrostatic charges. A developer such as toner is thrown by electrostatic force to a portion on the photosensitive member where a l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00H02M3/335H02M1/14
CPCG03G15/80H02M3/33523H02M1/14H02M3/3376Y02B70/10H02M1/0035H02M3/33553H02M1/08
Inventor 平林纯
Owner CANON KK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com