CN1848577A - Overcurrent protection circuit - Google Patents

Overcurrent protection circuit Download PDF

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Publication number
CN1848577A
CN1848577A CN 200510076853 CN200510076853A CN1848577A CN 1848577 A CN1848577 A CN 1848577A CN 200510076853 CN200510076853 CN 200510076853 CN 200510076853 A CN200510076853 A CN 200510076853A CN 1848577 A CN1848577 A CN 1848577A
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China
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reference voltage
circuit
output
current
voltage level
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CN 200510076853
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CN100420113C (en
Inventor
陈建海
冯东
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of CN100420113C publication Critical patent/CN100420113C/en
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Abstract

A over current protective circuit consists of current sampling circuit connected to power supply and load for outputting the sampling voltage value of sampling current, control unit for confirming reference voltage value according to over current valve value, voltage output circuit connected to control unit for outputting reference voltage value confirmed by control unit and voltage comparator for comparing the sampling voltage value with reference voltage value and for being used to output over current signal to indicate power supply switch to switch power off when sampling voltage value is greater then reference voltage value.

Description

Current foldback circuit
Technical field
The present invention relates to the circuit design technique field, relate in particular to a kind of current foldback circuit.
Background technology
In the traditional circuit technical field, current foldback circuit is a kind of a kind of circuit that can protect entire circuit under the excessive situation of the electric current of flowing through.
Please refer to Fig. 1, this figure is the application principle block diagram of existing current foldback circuit; The main effect of current foldback circuit 10 is the output currents that detect power supply among the figure, when detecting the electric current of flowing through above the predetermined electric current threshold values, closes automatically or deenergization.
Come in and with reference to Fig. 2, and this figure is the circuit theory composition frame chart of existing current foldback circuit; Traditional current foldback circuit is mainly finished overcurrent protection work jointly by following three functional units:
Current sampling circuit 101, one end is connected with power supply, the other end is connected with load, be used for being responsible for current value is sampled, usual way is at resistance of power output end series connection, because the voltage (being sampled voltage) and the electric current of this series resistance of flowing through at these series resistance two ends are directly proportional: (I is the current value of this series resistance of flowing through to U=IR, R is the resistance value of this series connection, U is the magnitude of voltage at this series resistance R two ends, be sampled voltage), therefore this magnitude of voltage that obtains just can be used as the sampled value of electric current;
Voltage comparator 102, the sample voltage value and the reference voltage level that are used for current sampling circuit 101 is obtained compare, the output termination mains switch of voltage comparator 102 wherein, the signal of its output output is the overcurrent index signal, this signal flows to mains switch with as power switch signal.When the electric current of the current sampling circuit 101 of flowing through increases; its sampled voltage that obtains increases; when sample voltage value during greater than reference voltage level, the overcurrent index signal of voltage comparator 102 outputs effectively and trigger the mains switch power cutoff, to reach the effect of entire circuit being carried out overcurrent protection.
Wherein, make the minimum sample rate current value of voltage comparator 102 output overcurrent index signals be referred to as the overcurrent threshold values.
Reference voltage source 103 can produce or employing dedicated reference voltage source (voltage source that promptly has fixed voltage value) by electric resistance partial pressure, provides reference voltage level to be used to voltage comparator 102.
Above-mentioned current foldback circuit of the prior art can only could realize setting different overcurrent threshold values by the reference voltage level that adjusting reference voltage source 103 provides, promptly when needs are adjusted the overcurrent threshold values, can only could realize by the reference voltage level that modification reference voltage source 103 provides, therefore be not suitable for being applied in the application scenario that needs often to revise the overcurrent threshold values, the application scenario that wherein needs often to revise the overcurrent threshold values refers to the occasion that load often changes, so that different overcurrent threshold values need be set according to different loads; As the lowest high-current value that can allow to pass through when load is 1 ampere-hour, and overcurrent threshold values that can current foldback circuit is set to 1 ampere; When changing a bigger load, its lowest high-current value that can allow to pass through is 2 ampere-hours, just the overcurrent threshold values of current foldback circuit need be revised as 2 amperes.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of can be applied in the current foldback circuit that needs often to revise overcurrent threshold values application scenario.
For addressing the above problem, the technical scheme that the present invention proposes is as follows:
A kind of current foldback circuit comprises:
The current sampling circuit that connects power supply and load respectively is used for the electric current of the load of flowing through is sampled, and the sample voltage value of output sample rate current;
Control unit is used for determining reference voltage level according to the overcurrent threshold values that the load that current sampling circuit connects can bear;
The voltage follower circuit that is connected with control unit is used for the reference voltage level output that control unit is determined; With
Voltage comparator is used for the sample voltage value of current sampling circuit output and the reference voltage level of voltage follower circuit output are compared, and when sample voltage value is higher than reference voltage level, output overcurrent index signal indication mains switch power cutoff.
Wherein said current sampling circuit is the resistance that is connected on power output end.
Wherein said control unit specifically comprises:
The reference voltage level computation subunit is used for overcurrent threshold values that the load that current sampling circuit connects be can bear and the resistance value that is connected on power output end and multiplies each other, and obtains described reference voltage level;
The indication subelement is used to the reference voltage level output of indicating voltage follower circuit that the reference voltage level computation subunit is calculated.
Wherein said voltage follower circuit is a digital to analog converter; The control port of described digital to analog converter is connected with control unit, and output port is used for the output reference voltage value.
The beneficial effect that the present invention can reach is as follows:
The overcurrent threshold values that current foldback circuit of the present invention can bear by the load that will adopt electric resistance partial pressure or dedicated reference voltage source to provide the mode of reference voltage level to change in traditional current foldback circuit to be connected according to current sampling circuit by control unit is dynamically adjusted and is determined reference voltage level; and export to voltage comparator by the reference voltage level that voltage follower circuit is determined control unit; compare the sample voltage value of current sampling circuit output and the reference voltage level of voltage follower circuit output by voltage comparator; determining whether sending the overcurrent index signal, thereby reach the purpose of entire circuit being carried out overcurrent protection to mains switch.Because current foldback circuit of the present invention can connect the adjustment reference voltage level of the overcurrent threshold values dynamic flexible that load can bear according to current sampling circuit by control unit, therefore is applicable to because the frequent conversion of load needs causes taking the application scenario of normal modification overcurrent threshold values.
Description of drawings
Fig. 1 is the application principle block diagram of existing current foldback circuit;
Fig. 2 is the circuit theory composition frame chart of existing current foldback circuit;
Fig. 3 is the main composition structured flowchart of current foldback circuit of the present invention;
Fig. 4 forms structured flowchart for a kind of embodiment of current foldback circuit of the present invention;
Fig. 5 is the application principle block diagram of current foldback circuit of the present invention.
Embodiment
Design aim of the present invention provides a kind of different overcurrent threshold values that can bear according to different loads; by software flexible control adjust in requisition for the current foldback circuit of reference voltage level, to be applicable to because the frequent transformation load of needs causes taking the application scenario of normal modification overcurrent threshold values.
Be explained in detail below in conjunction with the specific implementation process of each accompanying drawing current foldback circuit of the present invention; please refer to Fig. 3; this figure is the main composition structured flowchart of current foldback circuit of the present invention; its chief component comprises current sampling circuit 101, voltage comparator 102, control unit 1031 and 1,032 four parts of voltage follower circuit, the concrete function of each part and act on as follows:
Current sampling circuit 101 is connected with load with power supply respectively, and the electric current that is mainly used in the load of flowing through carries out sampling processing, and according to the linear relationship of electric current and voltage, the sample voltage value of output sample rate current; Wherein this current sampling circuit 101 can be by realizing at resistance of power output end series connection.
Control unit 1031 is mainly used in the overcurrent threshold values that the load that connects according to current sampling circuit 101 can bear and determines reference voltage level flexibly; Wherein control unit 1031 can be realized by the software in the system control cpu, promptly the resistance value of the control unit of being realized by software 1031 overcurrent threshold values that can bear according to the load that current sampling circuit 101 connects and power output end series connection is determined the reference voltage level of the overcurrent threshold values that can bear corresponding to load, and the reference voltage level of determining exported to voltage comparator 102, whether surpass the comparison judgement basis of the overcurrent threshold values that load can bear with the electric current of the load of determining as voltage comparator 102 to flow through.
Voltage follower circuit 1032 is connected with control unit 1031, is mainly used in the reference voltage level that control unit 1031 is determined and exports to voltage comparator 102; Wherein voltage follower circuit 1032 can adopt digital to analog converter (DAC, Digital-Analog Converter) to realize.
Voltage comparator 102; being used for the sample voltage value (sample voltage value is from "+" utmost point input of voltage comparator 102) to current sampling circuit 101 output and the reference voltage level (reference voltage level is imported from "-" utmost point of voltage comparator 102) of voltage follower circuit 1032 outputs compares; and relatively drawing when being higher than reference voltage level from the input of "-" utmost point from the sample voltage value of "+" utmost point input; the output overcurrent index signal is given mains switch; with indication mains switch power cutoff, reach the purpose of entire circuit being carried out overcurrent protection.
Please refer to Fig. 4, this figure is that a kind of embodiment of current foldback circuit of the present invention is formed structured flowchart, and wherein the concrete composition structure of this execution mode is as follows:
Current sampling circuit 101 is responsible for the current value of the load of flowing through is sampled, and method commonly used is exactly that wherein the voltage with these series resistance two ends outputs to voltage comparator 102 at the power output end resistance of connecting, with as sample voltage value.
Voltage comparator 102, wherein this voltage comparator 102+/-input in, the output of a termination current sampling circuit 101 is with the sample voltage value of received current sample circuit 101 output; The output of one termination digital to analog converter (DAC, Digital-Analog Converter) 1033 is to receive the reference voltage level of DAC 1033 outputs; The output of this voltage comparator 102 connects the power switch circuit of power supply; Relatively draw from the sample voltage value of "+" utmost point input greater than the time when voltage comparator 102 like this from the reference voltage level of "-" utmost point input; voltage comparator 102 is given power switch circuit with the output overcurrent index signal; indication power switch circuit power cutoff; so that entire circuit is carried out overcurrent protection, prevent load owing to flow through electric current when being higher than the overcurrent threshold values that self can bear and the phenomenon of being burnt occurs.Here require voltage comparator 102 will have higher response speed.
Digital to analog converter DAC 1033, its control port access control unit 1031, output port connects "-" utmost point of voltage comparator 102, and this DAC 1033 is controlled by the reference voltage level of output control unit 1031 indicated outputs.
Control unit 1031 can be realized by software is set in system control cpu, specifically comprises reference voltage level computation subunit 1035 and indication subelement 1034, wherein:
Reference voltage level computation subunit 1035, be mainly used in overcurrent threshold values I that load that current sampling circuit 101 is connected can bear and the resistance value R that is connected on power output end and multiply each other, to obtain reference voltage level U the overcurrent threshold values I that should load can bear;
Indication subelement 1034, the reference voltage level U that is used for reference voltage level computation subunit 1035 is calculated sends to DAC 1033, and DAC 1033 exports to voltage comparator 102 with reference voltage level from output port with indication.
To sum up, just can realize exporting the corresponding reference magnitudes of voltage according to the different DAC of control flexibly 1033 that current sampling circuit 101 connects load, to realize being provided with flexibly the purpose of different reference voltage levels according to the unequally loaded situation by the software in the system control cpu.Wherein the degree of regulation of reference voltage level and DAC choose relevant.
See also Fig. 5; this figure is the application principle block diagram of current foldback circuit of the present invention; current foldback circuit of the present invention as shown in the figure can be according to connecting different loading conditions; realize being provided with flexibly the reference voltage level of the overcurrent threshold values that corresponding different loads can bear by the software that is provided with in the system control cpu; can play overcurrent protection preferably to the circuit that often needs transformation load, when guaranteeing that different loads can not be higher than the overcurrent threshold values that load can bear because of the electric current of flowing through and be damaged.Current foldback circuit wherein of the present invention can be applied on the equipment such as various power supplys, instrument; and the overcurrent threshold values that can bear according to different loads is provided with different reference voltage levels; and need not revise any circuit hardware, only need can realize by software setting.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (4)

1, a kind of current foldback circuit is characterized in that, comprising:
The current sampling circuit that connects power supply and load respectively is used for the electric current of the load of flowing through is sampled, and the sample voltage value of output sample rate current;
Control unit is used for determining reference voltage level according to the overcurrent threshold values that the load that current sampling circuit connects can bear;
The voltage follower circuit that is connected with control unit is used for the reference voltage level output that control unit is determined; With
Voltage comparator is used for the sample voltage value of current sampling circuit output and the reference voltage level of voltage follower circuit output are compared, and when sample voltage value is higher than reference voltage level, output overcurrent index signal indication mains switch power cutoff.
2, current foldback circuit as claimed in claim 1 is characterized in that, described current sampling circuit is the resistance that is connected on power output end.
3, current foldback circuit as claimed in claim 2 is characterized in that, described control unit specifically comprises:
The reference voltage level computation subunit is used for overcurrent threshold values that the load that current sampling circuit connects be can bear and the resistance value that is connected on power output end and multiplies each other, and obtains described reference voltage level;
The indication subelement is used to the reference voltage level output of indicating voltage follower circuit that the reference voltage level computation subunit is calculated.
As claim 1,2 or 3 described current foldback circuits, it is characterized in that 4, described voltage follower circuit is a digital to analog converter; The control port of described digital to analog converter is connected with control unit, and output port is used for the output reference voltage value.
CNB2005100768534A 2005-06-17 2005-06-17 Overcurrent protection circuit Expired - Fee Related CN100420113C (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN100420113C CN100420113C (en) 2008-09-17

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Cited By (24)

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WO2010083753A1 (en) * 2009-01-21 2010-07-29 成都芯源系统有限公司 Circuit and method for providing power supply voltage for wireless network card
CN101860001A (en) * 2010-05-06 2010-10-13 北京鼎汉技术股份有限公司 Switch power supply current detection circuit
CN101931206A (en) * 2010-08-25 2010-12-29 常熟开关制造有限公司(原常熟开关厂) Over-current protection method
CN101976814A (en) * 2010-10-30 2011-02-16 珠海市鑫和电器有限公司 Medical power supply management circuit
CN101499646B (en) * 2008-06-10 2011-05-18 上海英联电子系统有限公司 Automatically temperature compensating average value over-current protection circuit
CN102487187A (en) * 2012-01-06 2012-06-06 厦门华侨电子股份有限公司 Power supply detection and control circuit
CN102545143A (en) * 2010-12-13 2012-07-04 华为技术有限公司 Device and method for detection and protection and circuit board
CN102798791A (en) * 2011-05-26 2012-11-28 通用电气公司 Systems and methods for determining electrical faults
CN102858049A (en) * 2011-06-30 2013-01-02 海洋王照明科技股份有限公司 Over-current protection sampling circuit, light-emitting diode (LED) drive circuit and LED lamp
CN102916387A (en) * 2012-10-31 2013-02-06 深圳市虹远通信有限责任公司 Protection circuit for multi-port POE (power over Ethernet) power supply output shunt
CN103219694A (en) * 2013-04-17 2013-07-24 宁波汉浦工具有限公司 Over-current protecting circuit
CN103259245A (en) * 2012-02-17 2013-08-21 台达电子工业股份有限公司 Protective circuit and protective method of electronic device
WO2013189197A1 (en) * 2012-06-19 2013-12-27 华为技术有限公司 Protection circuit, control method therefor, and telecommunication subrack equipment
CN104810783A (en) * 2014-01-27 2015-07-29 Ls产电株式会社 Analog current output module
US9541604B2 (en) 2013-04-29 2017-01-10 Ge Intelligent Platforms, Inc. Loop powered isolated contact input circuit and method for operating the same
CN106532635A (en) * 2016-11-11 2017-03-22 索尔思光电(成都)有限公司 Apd protection circuit
CN106597063A (en) * 2017-01-25 2017-04-26 杭州士兰微电子股份有限公司 Current detecting circuit and current detecting method
WO2018058999A1 (en) * 2016-09-28 2018-04-05 华为技术有限公司 Overcurrent point configuration method and apparatus, and overcurrent protection apparatus
CN109017631A (en) * 2018-06-27 2018-12-18 联合汽车电子有限公司 The sensor ground protection circuit of Vehicle Controller
CN109038476A (en) * 2018-08-08 2018-12-18 杭州先途电子有限公司 A kind of current foldback circuit and controller
CN111082677A (en) * 2019-12-30 2020-04-28 杭州士兰微电子股份有限公司 Switching power supply and control circuit and control method thereof
CN111181370A (en) * 2019-12-30 2020-05-19 杭州士兰微电子股份有限公司 Switching power supply and control circuit and control method thereof
CN113508506A (en) * 2020-12-31 2021-10-15 华为技术有限公司 Photovoltaic power generation system, photovoltaic inverter and direct current collection flow box
CN114076904A (en) * 2020-08-19 2022-02-22 深圳市理邦精密仪器股份有限公司 Protection circuit, electrical stimulation device and protection method

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CN101499646B (en) * 2008-06-10 2011-05-18 上海英联电子系统有限公司 Automatically temperature compensating average value over-current protection circuit
WO2010083753A1 (en) * 2009-01-21 2010-07-29 成都芯源系统有限公司 Circuit and method for providing power supply voltage for wireless network card
CN101860001A (en) * 2010-05-06 2010-10-13 北京鼎汉技术股份有限公司 Switch power supply current detection circuit
CN101860001B (en) * 2010-05-06 2012-11-28 北京鼎汉技术股份有限公司 Switch power supply current detection circuit
CN101931206B (en) * 2010-08-25 2013-04-03 常熟开关制造有限公司(原常熟开关厂) Over-current protection method
CN101931206A (en) * 2010-08-25 2010-12-29 常熟开关制造有限公司(原常熟开关厂) Over-current protection method
CN101976814A (en) * 2010-10-30 2011-02-16 珠海市鑫和电器有限公司 Medical power supply management circuit
CN101976814B (en) * 2010-10-30 2012-12-12 珠海市鑫和电器有限公司 Medical power supply management circuit
CN102545143A (en) * 2010-12-13 2012-07-04 华为技术有限公司 Device and method for detection and protection and circuit board
CN102798791B (en) * 2011-05-26 2018-01-09 通用电气公司 System and method for determining electric fault
CN102798791A (en) * 2011-05-26 2012-11-28 通用电气公司 Systems and methods for determining electrical faults
CN102858049B (en) * 2011-06-30 2015-02-18 海洋王照明科技股份有限公司 Over-current protection sampling circuit, light-emitting diode (LED) drive circuit and LED lamp
CN102858049A (en) * 2011-06-30 2013-01-02 海洋王照明科技股份有限公司 Over-current protection sampling circuit, light-emitting diode (LED) drive circuit and LED lamp
CN102487187A (en) * 2012-01-06 2012-06-06 厦门华侨电子股份有限公司 Power supply detection and control circuit
CN103259245A (en) * 2012-02-17 2013-08-21 台达电子工业股份有限公司 Protective circuit and protective method of electronic device
CN103259245B (en) * 2012-02-17 2015-10-28 台达电子工业股份有限公司 The protective circuit of electronic installation and guard method
WO2013189197A1 (en) * 2012-06-19 2013-12-27 华为技术有限公司 Protection circuit, control method therefor, and telecommunication subrack equipment
CN102916387A (en) * 2012-10-31 2013-02-06 深圳市虹远通信有限责任公司 Protection circuit for multi-port POE (power over Ethernet) power supply output shunt
CN103219694A (en) * 2013-04-17 2013-07-24 宁波汉浦工具有限公司 Over-current protecting circuit
CN103219694B (en) * 2013-04-17 2015-09-23 宁波汉浦工具有限公司 Current foldback circuit
US9541604B2 (en) 2013-04-29 2017-01-10 Ge Intelligent Platforms, Inc. Loop powered isolated contact input circuit and method for operating the same
CN104810783B (en) * 2014-01-27 2019-03-05 Ls产电株式会社 Analog current output module
CN104810783A (en) * 2014-01-27 2015-07-29 Ls产电株式会社 Analog current output module
WO2018058999A1 (en) * 2016-09-28 2018-04-05 华为技术有限公司 Overcurrent point configuration method and apparatus, and overcurrent protection apparatus
CN106532635A (en) * 2016-11-11 2017-03-22 索尔思光电(成都)有限公司 Apd protection circuit
CN106597063A (en) * 2017-01-25 2017-04-26 杭州士兰微电子股份有限公司 Current detecting circuit and current detecting method
CN109017631A (en) * 2018-06-27 2018-12-18 联合汽车电子有限公司 The sensor ground protection circuit of Vehicle Controller
CN109038476A (en) * 2018-08-08 2018-12-18 杭州先途电子有限公司 A kind of current foldback circuit and controller
CN111082677A (en) * 2019-12-30 2020-04-28 杭州士兰微电子股份有限公司 Switching power supply and control circuit and control method thereof
CN111181370A (en) * 2019-12-30 2020-05-19 杭州士兰微电子股份有限公司 Switching power supply and control circuit and control method thereof
CN111082677B (en) * 2019-12-30 2022-03-15 杭州士兰微电子股份有限公司 Switching power supply and control circuit and control method thereof
CN114076904A (en) * 2020-08-19 2022-02-22 深圳市理邦精密仪器股份有限公司 Protection circuit, electrical stimulation device and protection method
CN113508506A (en) * 2020-12-31 2021-10-15 华为技术有限公司 Photovoltaic power generation system, photovoltaic inverter and direct current collection flow box
US12003096B2 (en) 2020-12-31 2024-06-04 Huawei Digital Power Technologies Co., Ltd. Photovoltaic power generation system, photovoltaic inverter, and direct current combiner box

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