CN1254001C - 用于提供高电压的电源装置 - Google Patents

用于提供高电压的电源装置 Download PDF

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CN1254001C
CN1254001C CNB021504334A CN02150433A CN1254001C CN 1254001 C CN1254001 C CN 1254001C CN B021504334 A CNB021504334 A CN B021504334A CN 02150433 A CN02150433 A CN 02150433A CN 1254001 C CN1254001 C CN 1254001C
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power
signal
output
pwm signal
potential
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CN1463071A (zh
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赵钟化
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Hewlett Packard Development Co LP
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Samsung Electronics Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0003Details of control, feedback or regulation circuits
    • H02M1/0025Arrangements for modifying reference values, feedback values or error values in the control loop of a converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Inverter Devices (AREA)
  • Developing For Electrophotography (AREA)

Abstract

一种功率发生器,更具体地说,一种用于提供高电压的电源装置,借助于所述电源装置,用户可以按照外部提供的输入随意地改变由所述功率发生器提供的功率。所述用于提供高电压的电源装置包括第一信号处理单元,其以一个预定的带宽滤波并调节第一PWM信号,以便设置一个参考电位;以及第二信号处理单元,其比较所述参考电位和一个第二输入PWM信号,按照比较结果改变要输出的功率,并把所述功率改变为高电压的功率,并输出所述转换的功率。所述输出电位可以通过改变比较器的参考电位来改变。

Description

用于提供高电压的电源装置
技术领域
本发明涉及一种功率发生器,尤其涉及一种用于提供高电压的电源装置,借助于所述电源装置,用户可以按照外部提供的输入随意地改变由所述功率发生器提供的功率。
背景技术
图1表示用于提供高电压的常规的电源装置的结构的方块图。参见图1,用于提供高电压的常规的电源装置包括脉宽调制输入单元100,其接收来自CPU(未示出)的信号PWM,从而输出交流高电压;比较器101,其比较输入的PWM信号和参考电位;开关控制器102,其形成直到电位V2的比较输出信号;变压器(TRANS)103,其把开关控制器102的输出信号转换成高电压;以及最后的输出单元104,其输出被转换成高电压的信号。
如果PWM从CPU输入到比较器101,则比较器101比较信号PWM和由电阻R3和R4分压的参考电位,并产生一个比较输出。所述比较输出和信号PWM的相位相同,并且开关控制器102通过响应输入信号使晶体管Q1进行导通/截止操作产生具有电位V2的信号。此后,由开关控制器102产生的信号由变压器103放大,并通过最后的输出端子输出。
用于提供高电压的常规的电源装置放大输入的PWM信号,并把放大的PWM信号提供给一个显影(development)单元,所述显影单元的占空比(%)由CPU改变。不过,如图2所示,交流输出电位Vp-p按照对电阻R3和电阻R4设置的参考电位是固定的。为了调节输出电位,应当和电阻R3、R4连接一个可变电阻,使得参考电位可改变。当这种装置工作时,不可能自动地改变电阻R3和R4。在单激光束打印机的情况下,具有交流高电压的固定的输出可以适应于显影处理的各种条件。在彩色激光束打印机的情况下,由于更复杂的处理环境和条件,需要一种使用户能够随意地改变输出电位Vp-p的电源装置。
发明内容
为了解决上述问题,本发明的目的在于,提供一种用于提供高电压的电源装置,利用所述电源装置,通过按照在常规的激光打印机的非接触显影方法中使用的交流高压固定的输出电路中外部施加的输入改变输出电位,可以更有效地调节彩色激光束打印机的浓度显影,并且可以有效地改善彩色激光束打印机的图像质量。
相应地,为实现上述目的,提供一种用于提供高电压的电源装置。所述装置包括:滤波器,所述滤波器以预定的带宽对第一输入PWM信号进行滤波,并以直流电平输出所述第一PWM信号;参考电位设置单元,其对具有直流电平的第一PWM信号的电压进行分压,从而设置一个参考电位;比较器,所述比较器比较参考电位和第二输入PWM信号;开关单元,用于按照比较器的比较结果切换要输出的功率;以及转换单元,用于把切换的输出功率转换成高压功率。优选的是,所述第一PWM信号被调节为一个预定的占空比,并将其输入到所述滤波器。
附图说明
通过结合附图说明本发明的优选实施例,可以更加清楚地看出本发明的上述目的和优点,其中:
图1是表示用于提供高电压的常规的电源装置的结构方块图;
图2是表示在图1所示的装置中的固定的输出电位的波形图;
图3表示按照本发明的用于提供高电压的电源装置的结构的方块图;以及
图4A,4B是表示用于说明图3的装置中的改变的输出电位的波形图。
具体实施方式
下面结合附图详细说明本发明的结构和操作。
图3是表示按照本发明的用于提供高电压的电源装置的结构的方块图。参照图3,按照本发明的用于提供高电压的电源装置包括:PWM输入电压300,其接收来自CPU(未示出)的信号PWM1和PWM2;RC低通滤波器(LPF)301,其对信号PWM2进行低通滤波,并以直流电平输出经滤波的PWM2信号;比较器302,其借助于对具有直流电平的信号PWM2进行分压来设置参考电位,比较所述参考电位和信号PWM1,并按照比较结果转换和输出峰对峰的信号PWM1;开关控制器303,其在从所述比较器302输出信号PWM1时,转换要被输出的电位V2;变压器304,其把从开关控制器303输出的电位V2转换成高电位;以及输出单元305。
下面参照图3详细说明本发明。
CPU向PWM输入单元300输出用于产生高压功率的信号PWM1和PWM2。在这种情况下,信号PWM2以预定的占空比改变,以便设置一个参考电位。在本发明的实施例中,在图4A中,CPU把信号PWM2的占空比调节为20%,并把所述PWM2信号输出到PWM输入单元300。在图4B中,CPU把信号PWM2的占空比调节为80%,并把所述PWM2信号输出到PWM输入单元300。
RC LPF 301通过电阻R3和电容C1对以预定的占空比改变的信号PWM2进行低通滤波。经过RC LPF 301低通滤波的信号PWM2被转换成直流电平并被输出。
比较器302通过电阻R4和R5对具有直流电平的信号PWM2的电压进行分压,以便产生一个最终的参考电位。比较器302比较所述参考电位和信号PWM1,并按照比较结果转换和输出峰对峰值的信号PWM1。
当信号PWM1具有从比较器302输出的被转换的峰对峰值时,开关控制器303转换要被输出的电位V2。所述具有转换的峰对峰值的信号PWM1是用于控制晶体管Q1的导通和截止的控制信号,这样,响应所述控制信号转换要被输出的电位V2,因而产生具有电位V2的脉冲波形。
变压器304放大从开关控制器303输出的电位V2的脉冲波形,并把放大的电位V2通过输出单元305提供给显影单元。
图4A和图4B是说明输出电位V2响应输入的PWM2信号而改变的波形图。图4A说明当信号PWM2的占空比是20%时输出的交流高压(峰对峰的V2),图4B说明当信号PWM2的占空比是80%时输出的交流高压(峰对峰的V2)。由图4A和图4B可见,通过改变信号PWM2的占空比可以改变电位V2的输出。
如上所述,通过改变比较器的参考电位可以改变输出电位。特别是,这使得能够更有效地调节彩色激光束打印机的浓度显影,并且更有效地提高具有复杂的处理设置和条件的彩色激光束打印机的图像质量,通过对比较器的输入端(+)、(-)施加PWM输入,可以更灵活地适应打印环境。
虽然结合优选实施例说明了本发明,但是本领域的技术人员可以理解,不脱离由所提出的权利要求及其等效物限定的本发明的构思和范围的情况下,可以在结构细节方面进行各种改变。

Claims (2)

1.一种用于提供高电压的电源装置,所述装置包括:
滤波器,所述滤波器以预定的带宽对第一输入PWM信号进行滤波,并以直流电平输出所述第一PWM信号;
参考电位设置单元,其对具有直流电平的第一PWM信号的电压进行分压,从而设置一个参考电位;
比较器,所述比较器比较参考电位和第二输入PWM信号;
开关单元,用于按照比较器的比较结果切换要输出的功率;以及
转换单元,用于把切换的输出功率转换成高压功率。
2.如权利要求1所述的装置,其中所述第一PWM信号被调节到一个预定的占空比,并将其输入到所述滤波器。
CNB021504334A 2002-05-27 2002-11-12 用于提供高电压的电源装置 Expired - Fee Related CN1254001C (zh)

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KR10-2002-0029310A KR100433551B1 (ko) 2002-05-27 2002-05-27 고압 전원 장치
KR29310/2002 2002-05-27

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KR100788684B1 (ko) * 2006-03-03 2007-12-26 삼성전자주식회사 전원 공급 제어장치 및 방법

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JP2003348853A (ja) 2003-12-05
KR100433551B1 (ko) 2004-05-31
KR20030091375A (ko) 2003-12-03
US20060113983A1 (en) 2006-06-01
JP3734474B2 (ja) 2006-01-11
CN1463071A (zh) 2003-12-24
US7630215B2 (en) 2009-12-08

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