CN101116240A - 开关变换器 - Google Patents
开关变换器 Download PDFInfo
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- CN101116240A CN101116240A CNA2006800043462A CN200680004346A CN101116240A CN 101116240 A CN101116240 A CN 101116240A CN A2006800043462 A CNA2006800043462 A CN A2006800043462A CN 200680004346 A CN200680004346 A CN 200680004346A CN 101116240 A CN101116240 A CN 101116240A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Television Receiver Circuits (AREA)
Abstract
一种开关变换器包括开关晶体管(T4)、第一电感(L4)和第一二极管(D4),连接它们形成降压变换器,以从输入电压(UE4)产生第一整流输出电压(UA4)。开关晶体管(T4)在输入侧经由第二电感(L5)连接到输入电压(UE4);第二二极管(D5)耦接到被布置在第二电感(L5)和开关晶体管(T4)之间的接头,以产生第二整流输出电压(UA5)。在这种情况下,第二整流输出电压是未经调节的,但是可以被具体地用作电视调谐器的供电电压。
Description
技术领域
本发明涉及一种具有开关晶体管、电感和二极管的开关变换器,并且涉及一种具有相应变换器的电视机。这种类型的开关变换器经常被用于例如消费电子设备中,以提供除了由开关式电源单元产生的供电电压之外的其他供电电压。
背景技术
根据现有技术的开关变换器有例如升压变换器、降压变换器或反向变换器(inverse converter)。在图1a、1b和1c中示意性地图示了这种类型的电路。图1a示出具有开关晶体管T1的降压变换器,开关晶体管T1在发射极处连接到DC电压UE1且在集电极处连接到线圈L1。此外,二极管D1连接到集电极,二极管D1的阳极连接到地。
在输出侧,连接到地的电容器C1连接到电感L1,并为负载RL1提供供电电压UA1。在这种情况下,经由反馈电路和调节电路(未示出)来控制开关晶体管T1的基极,例如利用PWM信号,使得输出电压UA1稳定为负载RL1的函数。
图1b图示了升压变换器,其具有:线圈L2,其在输入侧连接到DC电压UE2;以及开关晶体管T2,其在集电极侧连接到线圈L2的输出且在发射极侧连接到地。此外,二极管D2连接到开关晶体管T2的集电极,并在输出侧经由电容器C2提供整流供电电压UA2,以给负载RL2供电。
图1c图示了具有开关晶体管T3、线圈L3和二极管D3的、用于产生输出电压UA3的反向变换器,输出电压UA3相对于输入电压UE3具有相反的极性。
发明内容
根据本发明的开关变换器具有开关晶体管、电感和二极管,它们被布置为降压变换器以从整流输入电压产生第一整流输出电压。开关晶体管在输入侧经由第二电感连接到输入电压,第二二极管在阳极侧耦接到布置在第二电感和开关晶体管之间的接头,以产生第二输出电压。在这种情况下,第二输出电压是比输入电压高的整流电压。
例如,开关晶体管是集成电路的一部分,或者耦接到集成驱动器电路,以产生调节的第一输出电压。在这种情况下,不对第二输出电压进行调节,这是因为以第一输出电压的载荷(loading)的函数,例如利用PWM信号,来对开关晶体管计时。然而,对于特定使用,例如在具有调谐器的电视机或其他的消费电子设备中,这并不是缺点。在这种情况下,第二输出电压可以被具体地用于,产生相应调谐器所需的、用于调谐电容二极管的+40伏电压。第一输出电压可以被具体地用于,给要求非常低的供电电压(例如3.3伏、2.5伏或1.8伏)的集成电路供电。
在这种情况下,可以将已经存在的开关式电源单元的供电电压用作开关变换器的输入电压。具体地,如果已经占用了为开关式电源单元的变压器(transformer)的输出电压配备的所有连接引脚,则根据本发明的开关式电源单元提供一种用于产生调谐器的调谐电压的经济的替代方案。
附图说明
参考示意性电路图,下面将通过示例更详细地解释本发明。在附图中:
图1a示出根据现有技术的降压变换器;
图1b示出根据现有技术的升压变换器;
图1c示出根据现有技术的反向变换器;以及
图2示出根据本发明的、用于产生两个输出电压的开关变换器。
具体实施方式
图2图示具有开关晶体管T4的开关变换器,在该示例实施例中,开关晶体管T4被集成在集成电路IC1中。例如,电路IC1是集成电路MC34064,其可以从例如ON Semiconductors获得,且其包括用于操作开关晶体管T4的控制和监控电路。具体地,也可以将MOSFET用作开关晶体管T4。
开关晶体管T4在输入侧连接到整流输入电压UE4,在输出侧经由二极管D4连接到地。电感L4(在该示例实施例中为线圈)连接到开关晶体管T4的输出且在其另一端连接到充电电容器C4。
二极管D4在其阳极连接到地;由此,连接电路以形成降压变换器,且在该示例实施例中,从+9伏DC电压产生在充电电容器C4处的3.3伏的整流输出电压UA4。经由反馈环路FB稳定输出电压UA4。在这种情况下,包括关于经由电容器C4施加的输出电压UA4的信息的调节信号被反馈到集成电路IC1的调节输入。至此,该电路作为降压变换器。
根据本发明,第二电感L5(具体地为线圈)被布置在开关晶体管T4的电流输入和输入电压UE4之间。电感L5的电感值小于第一电感L4的电感值,且优选地小于30%,在图2的示例实施例中仅为10%。用于产生输出电压UA4的降压变换器的工作没有因此而受到影响。如果开关晶体管T4导通,则电感L5产生电压降。然而,该电压降不应大到扰乱用于产生输出电压UA4的降压变换器的工作。
此外,二极管D5在其阴极连接到电感L5,且在其阳极连接到第二充电电容器C5(该第二充电电容器C5连接到地)以产生第二整流输出电压UA5。二极管D5的阴极被耦接到布置在电感L5和开关晶体管T4之间的接头A。
该电路如下起作用:如果开关晶体管T4导通,则电流流过电感L5且使得磁场被建立起来。如果开关晶体管T4截止,则经由电感L5产生感应电压,且该感应电压经由二极管D5对电容器C5充电。因此,开关晶体管T4与电感L5和二极管D5一起作为升压变换器起作用。因此,开关变换器同时产生两个输出电压UA4和UA5,其中,输出电压UA5高于输入电压UE4且输出电压UA4低于输入电压UE4。
在这种情况下,输出电压UA5没有经过调节,且具体地依赖于运行开关晶体管T4的占空比。由于电感L5的电感值较低,所以只能将具有较低功耗的负载连接到输出电压UA5。因此,对于特定应用范围而言,该开关变换器是有利的。它可以被具体地用于电视接收机,例如在电视机和录像机中,它们要求未经调节的大约40伏的工作电压用于相应调谐器的工作。
在当今的电视调谐器中,一般提供稳定电路以给用于调谐的电容二极管产生+33伏或+30伏电压。因此,在大约40-50伏范围之内的未经调节的供电电压是足够的。具体地,如果输出电压UA4用于供应恒定负载,则可以通过近似地选择线圈L5的电感来产生具有该范围的输出电压UA5。
输出电压UA4可以被有利地用于对要求3.3伏、2.5伏或更小的未经调节的供电电压的数字电路供电。通常不利用具有足够稳定度的常规的逆向变换器(flyback-converter)的开关式电源电压来供应该特性的供电电压。因此,具体地提供开关变换器作为开关式电源单元的补充,该开关式电源单元是在电视接收机中已经提供的,并且同时为开关变换器提供输入电压UE4。
Claims (7)
1.一种具有开关晶体管(T4)、第一电感(L4)和第一二极管(D4)的开关变换器,被布置为降压变换器以从输入电压(UE4)产生第一整流输出电压(UA4),其特征在于:
开关晶体管(T4)通过输入端经由第二电感(L5)耦接到输入电压(UE4);以及
第二二极管(D5)耦接到被布置在第二电感(L5)和开关晶体管(T4)之间的接头(A),以产生第二整流输出电压(UA5)。
2.如权利要求1所述开关变换器,其特征在于:所述电源具有用于稳定所述第一输出电压(UA4)的控制电路(IC1)和反馈环路(FB)。
3.如权利要求1或2所述的开关变换器,其特征在于:所述第二二极管(D5)在阳极侧连接到所述第二电感(L5),以产生第二输出电压(UA5),该第二输出电压(UA5)高于所述输入电压(UE4)。
4.如权利要求1、2或3所述的开关变换器,其特征在于:所述第二电感(L5)的电感值小于所述第一电感(L4)的值的30%。
5.一种电视接收机,其特征在于:其具有根据在前权利要求中任一项的开关变换器。
6.如权利要求5所述的电视接收机,其特征在于:该电视接收机具有给所述开关变换器产生所述输入电压(UE4)的开关式电源单元,且特征在于:该电视接收机具有连接到所述第二输出电压(UA5)的调谐器。
7.如权利要求6所述的电视接收机,其特征在于:所述第二输出电压(UA5)可用作所述调谐器的调谐电压。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102005005872.8 | 2005-02-09 | ||
DE102005005872A DE102005005872A1 (de) | 2005-02-09 | 2005-02-09 | Getaktete Stromversorgung |
Publications (2)
Publication Number | Publication Date |
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CN101116240A true CN101116240A (zh) | 2008-01-30 |
CN100557931C CN100557931C (zh) | 2009-11-04 |
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Application Number | Title | Priority Date | Filing Date |
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CNB2006800043462A Expired - Fee Related CN100557931C (zh) | 2005-02-09 | 2006-01-24 | 开关变换器 |
Country Status (7)
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US (1) | US20080116867A1 (zh) |
EP (1) | EP1847008B1 (zh) |
JP (1) | JP2008530965A (zh) |
KR (1) | KR20070101873A (zh) |
CN (1) | CN100557931C (zh) |
DE (2) | DE102005005872A1 (zh) |
WO (1) | WO2006084789A1 (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112913110A (zh) * | 2018-09-26 | 2021-06-04 | 艾格电子工程责任有限公司 | 用于用转换器将电力传输到电负载的设备 |
Families Citing this family (3)
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CN103760359B (zh) | 2008-10-21 | 2017-01-11 | 阿斯图特医药公司 | 用于诊断和预后肾损伤和肾衰竭的方法和组合物 |
US20110084552A1 (en) * | 2009-10-14 | 2011-04-14 | Energy Micro AS | Power Management Methodology |
DE102011075985B4 (de) * | 2011-05-17 | 2018-02-22 | Physik Instrumente (Pi) Gmbh & Co. Kg | Inverter |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS63228966A (ja) * | 1987-03-17 | 1988-09-22 | Fujitsu Ltd | Dc−dcコンバ−タ |
US4945465A (en) * | 1988-09-15 | 1990-07-31 | U.S. Philips Corporation | Switched-mode power supply circuit |
US5164656A (en) * | 1989-08-14 | 1992-11-17 | Zdzislaw Gulczynski | Switching power supply with constant or sinusoidal input current |
US5412308A (en) * | 1994-01-06 | 1995-05-02 | Hewlett-Packard Corporation | Dual voltage power supply |
JPH0956150A (ja) * | 1995-08-11 | 1997-02-25 | Nippon Steel Corp | スイッチング電源装置 |
US5886508A (en) * | 1997-08-29 | 1999-03-23 | Computer Products, Inc. | Multiple output voltages from a cascaded buck converter topology |
JP3490327B2 (ja) * | 1999-02-19 | 2004-01-26 | 東光株式会社 | スイッチング電源装置 |
US6222352B1 (en) * | 1999-05-06 | 2001-04-24 | Fairchild Semiconductor Corporation | Multiple voltage output buck converter with a single inductor |
US6495993B2 (en) * | 2001-02-20 | 2002-12-17 | Linear Technology Corporation | Circuitry for improving the efficiency of a switching regulator by reducing reverse recovery current |
JP2004343909A (ja) * | 2003-05-16 | 2004-12-02 | Fuji Photo Film Co Ltd | 電源回路及び電子機器 |
US7511463B2 (en) * | 2005-06-21 | 2009-03-31 | Intel Corporation | Multiple output buck converter |
-
2005
- 2005-02-09 DE DE102005005872A patent/DE102005005872A1/de not_active Withdrawn
-
2006
- 2006-01-24 JP JP2007553583A patent/JP2008530965A/ja active Pending
- 2006-01-24 KR KR1020077017714A patent/KR20070101873A/ko not_active Application Discontinuation
- 2006-01-24 CN CNB2006800043462A patent/CN100557931C/zh not_active Expired - Fee Related
- 2006-01-24 US US11/883,251 patent/US20080116867A1/en not_active Abandoned
- 2006-01-24 DE DE602006006289T patent/DE602006006289D1/de active Active
- 2006-01-24 EP EP06707812A patent/EP1847008B1/en not_active Expired - Fee Related
- 2006-01-24 WO PCT/EP2006/050395 patent/WO2006084789A1/en active Application Filing
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112913110A (zh) * | 2018-09-26 | 2021-06-04 | 艾格电子工程责任有限公司 | 用于用转换器将电力传输到电负载的设备 |
Also Published As
Publication number | Publication date |
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EP1847008B1 (en) | 2009-04-15 |
DE602006006289D1 (de) | 2009-05-28 |
EP1847008A1 (en) | 2007-10-24 |
JP2008530965A (ja) | 2008-08-07 |
US20080116867A1 (en) | 2008-05-22 |
WO2006084789A1 (en) | 2006-08-17 |
KR20070101873A (ko) | 2007-10-17 |
CN100557931C (zh) | 2009-11-04 |
DE102005005872A1 (de) | 2006-08-10 |
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