CN100511939C - 稳压器 - Google Patents

稳压器 Download PDF

Info

Publication number
CN100511939C
CN100511939C CNB2005101253520A CN200510125352A CN100511939C CN 100511939 C CN100511939 C CN 100511939C CN B2005101253520 A CNB2005101253520 A CN B2005101253520A CN 200510125352 A CN200510125352 A CN 200510125352A CN 100511939 C CN100511939 C CN 100511939C
Authority
CN
China
Prior art keywords
transistor
output
voltage
circuit
grid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB2005101253520A
Other languages
English (en)
Other versions
CN1777006A (zh
Inventor
金久保圭秀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ablic Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Publication of CN1777006A publication Critical patent/CN1777006A/zh
Application granted granted Critical
Publication of CN100511939C publication Critical patent/CN100511939C/zh
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02M3/125—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 thyratron or thyristor type requiring extinguishing means
    • H02M3/135—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M3/137—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
    • G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
    • G05F1/573—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector
    • G05F1/5735—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector with foldback current limiting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)

Abstract

通过对下降型过流保护电路加上一个简单的电路，能给出一种在过流保护工作时可对短路电流进行控制的过流保护电路。通过根据输出电压值来控制输出晶体管的栅极电压，稳压器可改变过流保护工作时产生的短路电流值。

Description

稳压器
发明背景
技术领域
本发明涉及一种包含过流保护电路的稳压器。
背景技术
图3的电路图示明常规稳压器中的下降型过流保护电路。当稳压器输出端发生短路时，过流保护电路产生图4中所示的短路电流，故称之为下降型。
该电路中包括：误差放大器11，它放大基准电压电路10的基准电压与对于稳压器输出电压Vout实施分压的泄放电阻13和14连接点处电压Va两者之间的差值电压；以及，输出晶体管12。设误差放大器11的输出电压为Verr，基准电压电路10的输出电压为Vref，当Vref>Va时，Verr减小。当Vref≤Va时，Verr增大。
Verr减小时，本电路中为P沟道MOS晶体管的输出晶体管12中栅极-源极电压增大，导通电阻减小。因此，输出电压Vout增大。当Verr增大时，输出晶体管12的导通电阻增大，输出电压减小。由此，使输出电压Vout保持恒定。负载电阻20减小时，输出电流增大，输出晶体管12的栅极-源极电压增大。与输出晶体管12具有共同栅极电压的晶体管15中电流增大。随着晶体管15中电流的增大，电阻16中的电流增大。当该电流等于或大于预定值时，电阻16上的电压增大将超过晶体管17的门限值。于是，晶体管17导通，有电流流过电阻18。这时，晶体管19导通，输出晶体管12的栅极电压增大，使输出电压Vout减小。这样，过流保护起作用。
对于常规稳压器中的下降型过流保护电路来说，不论输出电压如何，由过流保护工作产生的电流是恒定的。虽然，输出电压控制于低值上，但输出电流保护为高值，施加于稳压器电路的负载保持为大负载(参见JP 2003-029856A(第6页，图3))。
发明内容
为解决该通常存在的问题，本发明的一个目的是给出一种过流保护电路，通过在常规的下降型过流保护电路上加上一个简单电路，能够控制由过流保护工作产生的短路电流。
按照本发明的稳压器可构造成，通过根据输出电压值来控制输出晶体管的栅极电压，能改变由过流保护工作产生的短路电流值。
按照本发明，只对常规的下降型过流保护电路加上一个简单电路，就可得到一种过流保护电路，它能够将过流保护电路工作时产生的短路电流控制于低的值上。
附图说明
图1是按照本发明的稳压器电路图；
图2的曲线图示明按照本发明的稳压器的过流保护特性；
图3是常规稳压器的电路图；以及
图4的曲线图示明常规稳压器的过流保护特性。
具体实施方式
图1是按照本发明的稳压器的电路图。稳压器中包括基准电压电路10、误差放大器11、泄放电阻13和14、输出晶体管12、负载电阻20、下垂型过流保护电路用的晶体管15、晶体管17、晶体管19和电阻16，它们与常规稳压器中的那些部件相同。
与常规的下降型过流保护电路的差别在于，其结构上还包含：晶体管1，它应用分压器电阻的分压点作为栅极电压；晶体管2，其栅极连接至晶体管1的漏极端，且漏极与栅极相连；以及，晶体管3，其栅极连接至晶体管2的栅极上。晶体管3的漏极与晶体管17的漏极和晶体管19的栅极相连。
参照图1的电路说明本发明的工作原理。
首先，输出电压正常时，泄放电阻分压点的电压高于晶体管1的门限电压，晶体管1导通。那时，流经晶体管1的电流通过晶体管2对晶体管3提供一个电流值。于是，当晶体管1导通而检测到高输出电压时，晶体管3导通，其电阻值变小。
其次，当由于某种原因输出端发生短路时，输出端电压减小，其输出电流增大。此时，流经晶体管15的电流也增大。当电阻16上的电压增大到超过晶体管17的门限值时，晶体管17导通。晶体管17导通后产生的电流超过流经晶体管3的电流时，晶体管19的栅极电压减小，于是，输出晶体管12的栅极电压增大，借此，过流保护电路起作用。
此时，随着过流保护工作下输出电压的减小，晶体管1的栅极电压减小，流经晶体管2的电流值被抑制。由此，过流保护至少工作在流经晶体管17的一个电流值上。进一步，由于晶体管3的作用等效于一个可变电阻，所以，如图2的过流保护特性所示，输出电压变得较低时使短路电流控制于较低的值上。
另外，本实施例中，泄放电阻的分压点和误差放大器的输入端具有共通的电位，不过，它们不必须具有共通电位。显然，当输入至晶体管栅极的电压更低于分压点电压时，并不会发生问题。
另外，电路中使用的泄放电阻用于监控输出电压值，不过，通过提供一个独立的电阻器之类用于输出电压监控也能得到等效的特性。
此外，以耗尽型晶体管来构成晶体管1，能将输出电压控制到更低的电压上。

Claims (2)

1.一种稳压器，包含：
分压电阻，对稳压器的输出电压进行分压；
基准电压电路；
误差放大器，将分压电阻分压点的电压与基准电压电路的电压进行比较；
输出晶体管，接收误差放大器的输出，以控制稳压器的输出电压；以及
过流保护电路，其包含第一晶体管、电阻器、输出电压检测晶体管、镜像电流电路、第二晶体管和第三晶体管，其中所述第一晶体管的栅极与输出晶体管的栅极相连，所述电阻器连接到第一晶体管的漏极，所述输出电压检测晶体管的栅极与分压电阻分压点相连，所述镜像电流电路的输入端连接到输出电压检测晶体管的漏极，所述第二晶体管的栅极与第一晶体管的漏极相连并且所述第二晶体管的漏极与镜像电流电路的输出端相连，所述第三晶体管的栅极与镜像电流电路的输出端相连并且所述第三晶体管的漏极与输出晶体管的栅极相连。
2.权利要求1的稳压器，其中，输出电压检测晶体管由耗尽型输出电压检测晶体管构成。
CNB2005101253520A 2004-11-15 2005-11-15 稳压器 Expired - Fee Related CN100511939C (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004330443 2004-11-15
JP2004330443A JP2006139673A (ja) 2004-11-15 2004-11-15 ボルテージレギュレータ

Publications (2)

Publication Number Publication Date
CN1777006A CN1777006A (zh) 2006-05-24
CN100511939C true CN100511939C (zh) 2009-07-08

Family

ID=36386014

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2005101253520A Expired - Fee Related CN100511939C (zh) 2004-11-15 2005-11-15 稳压器

Country Status (5)

Country Link
US (1) US7233462B2 (zh)
JP (1) JP2006139673A (zh)
KR (1) KR101109308B1 (zh)
CN (1) CN100511939C (zh)
TW (1) TWI355785B (zh)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4546320B2 (ja) * 2005-04-19 2010-09-15 株式会社リコー 定電圧電源回路及び定電圧電源回路の制御方法
JP4865504B2 (ja) * 2006-10-30 2012-02-01 株式会社リコー 電流検出回路及び電流検出回路を備えたボルテージレギュレータ
JP5082908B2 (ja) 2008-02-13 2012-11-28 富士通セミコンダクター株式会社 電源回路及びその過電流保護回路、並びに電子機器
US8115337B2 (en) 2008-12-01 2012-02-14 Texas Instruments Incorporated Soft-start circuit
JP5580608B2 (ja) * 2009-02-23 2014-08-27 セイコーインスツル株式会社 ボルテージレギュレータ
TWI427455B (zh) 2011-01-04 2014-02-21 Faraday Tech Corp 電壓調整器
CN102594145B (zh) * 2011-01-14 2014-08-20 智原科技股份有限公司 电压调整器
JP5670773B2 (ja) * 2011-02-01 2015-02-18 セイコーインスツル株式会社 ボルテージレギュレータ
JP2012203673A (ja) * 2011-03-25 2012-10-22 Seiko Instruments Inc ボルテージレギュレータ
JP2013200910A (ja) * 2012-03-23 2013-10-03 Toshiba Corp 半導体記憶装置及び半導体記憶装置の電圧出力方法
JP6030879B2 (ja) * 2012-07-26 2016-11-24 エスアイアイ・セミコンダクタ株式会社 ボルテージレギュレータ
JP6130112B2 (ja) * 2012-09-07 2017-05-17 エスアイアイ・セミコンダクタ株式会社 ボルテージレギュレータ
JP6342240B2 (ja) * 2013-08-26 2018-06-13 エイブリック株式会社 ボルテージレギュレータ
KR101630600B1 (ko) * 2014-08-06 2016-06-16 (주)태진기술 과전류 보호 회로를 갖는 전압 레귤레이터
US9853467B2 (en) * 2015-01-13 2017-12-26 Intersil Americas LLC Overcurrent protection in a battery charger
US10090688B2 (en) * 2015-01-13 2018-10-02 Intersil Americas LLC Overcurrent protection in a battery charger
JP6506133B2 (ja) * 2015-08-10 2019-04-24 エイブリック株式会社 ボルテージレギュレータ
TWI559278B (zh) * 2015-09-30 2016-11-21 立錡科技股份有限公司 切換式電源供應器及其控制電路與控制方法
JP7031983B2 (ja) * 2018-03-27 2022-03-08 エイブリック株式会社 ボルテージレギュレータ
CN112099560A (zh) * 2020-09-25 2020-12-18 上海华虹宏力半导体制造有限公司 线性稳压器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4574902B2 (ja) * 2001-07-13 2010-11-04 セイコーインスツル株式会社 ボルテージレギュレータ
JP3782726B2 (ja) * 2001-12-13 2006-06-07 株式会社リコー 過電流保護回路
JP2004118411A (ja) * 2002-09-25 2004-04-15 Seiko Instruments Inc ボルテージ・レギュレータ
ITTO20030533A1 (it) * 2003-07-10 2005-01-11 Atmel Corp Procedimento e circuito per la limitazione di corrente in
US6977491B1 (en) * 2003-10-06 2005-12-20 National Semiconductor Corporation Current limiting voltage regulation circuit
US7019584B2 (en) * 2004-01-30 2006-03-28 Lattice Semiconductor Corporation Output stages for high current low noise bandgap reference circuit implementations

Also Published As

Publication number Publication date
KR20060054156A (ko) 2006-05-22
US7233462B2 (en) 2007-06-19
JP2006139673A (ja) 2006-06-01
TW200631273A (en) 2006-09-01
KR101109308B1 (ko) 2012-01-31
CN1777006A (zh) 2006-05-24
US20060103992A1 (en) 2006-05-18
TWI355785B (en) 2012-01-01

Similar Documents

Publication Publication Date Title
CN100511939C (zh) 稳压器
CN100403205C (zh) 电压调节器
JP4758731B2 (ja) 定電圧電源回路
CN100397278C (zh) 电压调节器
JP5078866B2 (ja) ボルテージレギュレータ
KR101618612B1 (ko) 전압 조정기
US9429971B2 (en) Short-circuit protection for voltage regulators
CN1425962B (zh) 过流保护电路
US7339775B2 (en) Overcurrent protection circuit and DC power supply
EP1865397B1 (en) Low drop-out voltage regulator
EP1708069A1 (en) Overcurrent detecting circuit and regulator having the same
KR102225712B1 (ko) 볼티지 레귤레이터
KR20120109358A (ko) 전압 레귤레이터
KR20150048763A (ko) 볼티지 레귤레이터
US9071047B2 (en) Voltage regulator
CN112803901A (zh) 一种基于自适应过流保护的功率放大器
US9733284B2 (en) Current detection circuit
CN111490519A (zh) 一种过压过流的保护芯片
CN110121685B (zh) 电源电路
US20190220048A1 (en) Reverse-current-prevention circuit and power supply circuit
CN110888487B (zh) 一种低压差线性稳压器及电子设备
JP6070319B2 (ja) 過電圧保護回路
CN110262607B (zh) 带电流限制的稳压器
CN111711435A (zh) 一种提高限流控制系统中功率开关管安全性的方法
CN108493912A (zh) 一种过流保护电路及装置

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20160323

Address after: Chiba County, Japan

Patentee after: SEIKO INSTR INC

Address before: Chiba, Chiba, Japan

Patentee before: Seiko Instruments Inc.

CP01 Change in the name or title of a patent holder

Address after: Chiba County, Japan

Patentee after: EPPs Lingke Co. Ltd.

Address before: Chiba County, Japan

Patentee before: SEIKO INSTR INC

CP01 Change in the name or title of a patent holder
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20090708

Termination date: 20201115

CF01 Termination of patent right due to non-payment of annual fee