CN103414163A - Direct-current power supply output overcurrent protection device - Google Patents

Direct-current power supply output overcurrent protection device Download PDF

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Publication number
CN103414163A
CN103414163A CN201310376823XA CN201310376823A CN103414163A CN 103414163 A CN103414163 A CN 103414163A CN 201310376823X A CN201310376823X A CN 201310376823XA CN 201310376823 A CN201310376823 A CN 201310376823A CN 103414163 A CN103414163 A CN 103414163A
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power supply
resistance
output
reference source
circuit
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CN201310376823XA
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CN103414163B (en
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桑泉
涂俊杰
许育林
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Huadong Photoelectric Integrated Device Research Institute
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China North Industries Group Corp No 214 Research Institute Suzhou R&D Center
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Abstract

The invention relates to a direct-current power supply output overcurrent protection device which comprises a sampling circuit connected to the first output end of a direct-current power supply, a voltage stabilizing circuit connected with the sampling circuit and an N-MOS tube driven by a turn-on delay circuit. The voltage stabilizing circuit comprises a controllable precise reference source, a first resistor and a second resistor. The first resistor is connected with the second resistor in series, the common end of the first resistor and the second resistor is connected with the reference pole of the controllable precise reference source, the other end of the first resistor is connected with the sampling circuit, the other end of the second resistor is connected with the second output end of the direct-current power supply, the positive pole of the controllable precise reference source is connected with the sampling circuit, and the negative pole of the controllable precise reference source is connected with the turn-on delay circuit. The voltage stabilizing circuit with the controllable precise reference source is adopted, the circuit is simplified, cost is saved, the miniaturization integration of a DC-DC power supply is facilitated, and the precision of a set overcurrent protection current value can be guaranteed.

Description

DC power supply output overcurrent protective device
Technical field
The present invention relates to a kind of output overcurrent protective device that is applied to DC power supply.
Background technology
The present most of structure of existing DC-DC power supply overcurrent protective device is all to consist of sample circuit, operational amplifier, a reference source and comparator etc.The shortcomings such as the current value precision that this structure has complex structure, device is more, cost is higher, overcurrent protection arranges is not high.
For example the patent No. is 201120525144.0, name is called the utility model patent of " Switching Power Supply current foldback circuit ", and its disclosed a kind of Switching Power Supply current foldback circuit, comprising: the first diode, the second diode, voltage stabilizing didoe, triode, field effect transistor, capacitor; The second diode is connected with voltage stabilizing didoe, their negative pole is connected, the positive pole of voltage stabilizing didoe is connected with the base stage of triode, the positive pole of the second diode is connected with the positive pole of the first diode, the first end of capacitor, the negative pole of the first diode is connected with the drain electrode of field effect transistor, the second end of capacitor is connected with the emitter of triode, the collector electrode of triode is connected with the grid of field effect transistor, and the source electrode of field effect transistor is connected with the second end of the emitter of triode, capacitor.The shortcoming that this current foldback circuit exists is: it belongs to input overcurrent control circuit, and structure is more complicated; Output current overcurrent numerical precision is low.
Being written into the patent No. is 201120508714.5, name is called the utility model patent of " a kind of direct-current switch power supply current foldback circuit ", its disclosed a kind of direct-current switch power supply current foldback circuit, by adopting by current sampling resistor, over-current detection unit and protection control unit form the direct-current switch power supply current foldback circuit, when the sample rate current of current sampling resistor is greater than the output current threshold value of direct-current switch power supply, the control end of over-current detection unit starts the trigger end of protection control unit is carried out to control of Electric potentials, when the trigger end of protection control unit reaches electronegative potential, the protection control unit is controlled direct-current switch power supply and is quit work, and when reboot time arrives, drive direct-current switch power supply and restart and enter normal operating conditions.The shortcoming that this current foldback circuit exists is: its complex structure; The output current overcurrent condition is not cancelled, and power-supply controller of electric has the repeated priming phenomenon.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structure and DC power supply output overcurrent protective device that precision is higher.
For achieving the above object, the technical solution used in the present invention is:
A kind of DC power supply output overcurrent protective device, with have the first output and be connected with the DC power supply of the second output, it comprises the sample circuit of the first output of the output current that is connected in described DC power supply, the voltage stabilizing circuit be connected with described sample circuit, the N-MOS pipe driven through opening delay circuit;
Described voltage stabilizing circuit comprises controllable accurate a reference source, the first resistance, the second resistance; Described the first resistance and described the second resistance are in series, and the common end of described the first resistance and described the second resistance is connected with the reference utmost point of described controllable accurate a reference source, the other end of described the first resistance is connected with described sample circuit, the other end of described the second resistance is connected with the second output of described DC power supply, the positive pole of described controllable accurate a reference source is connected with described sample circuit, and the negative pole of described controllable accurate a reference source is connected with described unlatching delay circuit.
Preferably, described sample circuit comprises the sampling resistor with first end and second end, and the first end of described sampling resistor is connected with the positive pole of described controllable accurate a reference source, and the second end of described sampling resistor is connected with described the first resistance.
Preferably, between the first end of described sampling resistor and the second end, go back and be connected to the first electric capacity.
Preferably, described unlatching delay circuit comprises the 3rd resistance and the second electric capacity between the second output of the negative pole that is connected to described controllable accurate a reference source and described DC power supply, and the end that described the 3rd resistance, described the second electric capacity are connected with described controllable accurate a reference source is connected with described N-MOS pipe.
Preferably, the grid of described N-MOS pipe is connected with described unlatching delay circuit, and the source electrode of described N-MOS pipe and drain electrode are connected on the first output of described DC power supply.
Preferably, between the grid of described N-MOS pipe and source electrode, also be connected with voltage-stabiliser tube.
Because technique scheme is used; the present invention compared with prior art has following advantages: the present invention has adopted the voltage stabilizing circuit with controllable accurate a reference source to replace operational amplifier and comparator and the reference voltage circuit in traditional overcurrent protective device structure; the miniaturizationization that simplified circuit, saved cost, is conducive to the DC-DC power supply is integrated, and can guarantee the precision of the overcurrent protection current value arranged.
The accompanying drawing explanation
Accompanying drawing 1 is the theory diagram of DC power supply output overcurrent protective device of the present invention.
Accompanying drawing 2 is the circuit theory diagrams of DC power supply output overcurrent protective device of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment shown in the drawings.
Embodiment mono-: shown in accompanying drawing 1.A kind of DC power supply output overcurrent protective device; with have the first output GND and be connected with the DC power supply of the second output end vo, it comprises the sample circuit of the first output GND of the output current that is connected in DC power supply, the voltage stabilizing circuit be connected with sample circuit, the N-MOS pipe V1 driven through opening delay circuit.
Particular circuit configurations is referring to shown in accompanying drawing 2.
Sample circuit comprises the sampling resistor R with first end GND1 and second end GND2, and the first end GND1 of sampling resistor R is connected with voltage stabilizing circuit respectively with the second end GND2.Between the first end GND1 of sampling resistor R and the second end, go back and be connected to the first capacitor C 1.
Voltage stabilizing circuit comprises controllable accurate a reference source N1, the first resistance R 1, the second resistance R 2.Controllable accurate a reference source N1 adopts TL431.The first resistance R 1 and the second resistance R 2 are in series, and the common end of the first resistance R 1 and the second resistance R 2 is connected with the reference utmost point Vref of controllable accurate a reference source N1, the other end of the first resistance R 1 is connected with the second end GND2 of sampling resistor R in sample circuit, the other end of the second resistance R 2 is connected with the second output end vo of DC power supply, the positive pole of controllable accurate a reference source N1 is connected with the first end GND1 of sampling resistor R in sample circuit, and the negative pole of controllable accurate a reference source N1 is connected with the unlatching delay circuit.
Opening an end that the 3rd resistance R 3 between the second output end vo that delay circuit comprises the negative pole that is connected to controllable accurate a reference source N1 and DC power supply and the second capacitor C 2, the three resistance R 3, the second capacitor C 2 be connected with controllable accurate a reference source N1 manages V1 with N-MOS and is connected.
The grid of N-MOS pipe V1 is connected with the unlatching delay circuit, and the first output GND that the source electrode of N-MOS pipe V1 and drain electrode are connected in DC power supply is upper, and substrate and source electrode that N-MOS manages V1 connect altogether.Between the grid of N-MOS pipe V1 and source electrode, also be connected with voltage-stabiliser tube V2, the positive pole of voltage-stabiliser tube V2 is connected with the source electrode of N-MOS pipe V1, and the negative pole of voltage-stabiliser tube V2 is connected with the grid of N-MOS pipe V1.
In foregoing circuit, GND and Vo are the first output and second outputs of DC-DC power supply.As seen from Figure 2, the output current of DC-DC power supply is through sampling resistor R.When the no-output load, the upper no current of sampling resistor R flows through, the two ends of sampling resistor R, and namely between GND2 and GND1, no-voltage is poor, not conducting of TL431, N-MOS pipe V1 grid voltage is Vo, N-MOS pipe V1 is in conducting state always.When output connect load, load current progressively increased, and the voltage on sampling resistor R synchronously increases, thereby the voltage difference between GND2 and GND1 is raise, and then the reference utmost point Vref voltage of TL431 is raise.When output current increases to setting numerical value; the TL431 conducting; on the 3rd resistance R 3, voltage drop is just arranged; the grid voltage of N-MOS pipe V1 is just low level; level is lower than N-MOS grid thresholding; thereby N-MOS pipe V1 is turn-offed, disconnect between GND and GND1, completed the overcurrent protection function of DC-DC power output end.
In Fig. 2, the effect of the second capacitor C 2 is with the 3rd resistance R 3, to form the unlatching delay circuit of N-MOS pipe V1.The effect of the first capacitor C 1 is the filter current spike, when between Vo and GND, connecing large electric capacity, when Vo starts, on sampling resistor R, peak voltage is arranged, the misoperation of overcurrent function.Choosing of the resistance of the first resistance R 1 is according to the numerical value of Vo and guarantee that on the first resistance R 1, the voltage to GND1 is (when sampling resistor R went up specified cut-off current) that 2.5V determines.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.

Claims (6)

1. DC power supply output overcurrent protective device, with have the first output and be connected with the DC power supply of the second output, it is characterized in that: it comprises the sample circuit of the first output of the output current that is connected in described DC power supply, the voltage stabilizing circuit be connected with described sample circuit, the N-MOS pipe driven through opening delay circuit;
Described voltage stabilizing circuit comprises controllable accurate a reference source, the first resistance, the second resistance; Described the first resistance and described the second resistance are in series, and the common end of described the first resistance and described the second resistance is connected with the reference utmost point of described controllable accurate a reference source, the other end of described the first resistance is connected with described sample circuit, the other end of described the second resistance is connected with the second output of described DC power supply, the positive pole of described controllable accurate a reference source is connected with described sample circuit, and the negative pole of described controllable accurate a reference source is connected with described unlatching delay circuit.
2. DC power supply output overcurrent protective device according to claim 1; it is characterized in that: described sample circuit comprises the sampling resistor with first end and second end; the first end of described sampling resistor is connected with the positive pole of described controllable accurate a reference source, and the second end of described sampling resistor is connected with described the first resistance.
3. DC power supply output overcurrent protective device according to claim 2, is characterized in that: go back and be connected to the first electric capacity between the first end of described sampling resistor and the second end.
4. DC power supply output overcurrent protective device according to claim 1; it is characterized in that: described unlatching delay circuit comprises the 3rd resistance and the second electric capacity between the second output of the negative pole that is connected to described controllable accurate a reference source and described DC power supply, and the end that described the 3rd resistance, described the second electric capacity are connected with described controllable accurate a reference source is connected with described N-MOS pipe.
5. DC power supply output overcurrent protective device according to claim 1; it is characterized in that: the grid of described N-MOS pipe is connected with described unlatching delay circuit, and the source electrode of described N-MOS pipe and drain electrode are connected on the first output of described DC power supply.
6. DC power supply output overcurrent protective device according to claim 5, is characterized in that: between the grid of described N-MOS pipe and source electrode, also be connected with voltage-stabiliser tube.
CN201310376823.XA 2013-08-26 2013-08-26 DC source output overcurrent protection device Active CN103414163B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105743059A (en) * 2016-02-19 2016-07-06 中国兵器工业集团第二一四研究所苏州研发中心 Output over-current protection circuit formed by reference source and resistor
CN105977921A (en) * 2016-06-27 2016-09-28 中国兵器工业集团第二四研究所苏州研发中心 Isolation power supply overcurrent turn-off delay protection circuit
CN106300952A (en) * 2016-11-02 2017-01-04 东莞市石龙富华电子有限公司 The soft-start method of a kind of inefficiency loss power output end Anti-surging and circuit
CN110632442A (en) * 2019-10-10 2019-12-31 华东光电集成器件研究所 Capacitor aging leakage detection power-off protection circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100828798B1 (en) * 2006-11-06 2008-05-09 현대자동차주식회사 Current stress reduction circuit for boost input-type converter
CN101888185A (en) * 2009-05-12 2010-11-17 中国电子为华实业发展有限公司 Switch power circuit and power supply short circuit over-current protection circuit
CN201708975U (en) * 2010-06-22 2011-01-12 刘昌贵 Constant current source circuit
CN202384752U (en) * 2011-12-15 2012-08-15 安徽华东光电技术研究所 Switching power supply overcurrent protection circuit
CN102891609A (en) * 2012-11-01 2013-01-23 东文高压电源(天津)有限公司 Negative polarity fixed output high-voltage power circuit consisting of TL431

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100828798B1 (en) * 2006-11-06 2008-05-09 현대자동차주식회사 Current stress reduction circuit for boost input-type converter
CN101888185A (en) * 2009-05-12 2010-11-17 中国电子为华实业发展有限公司 Switch power circuit and power supply short circuit over-current protection circuit
CN201708975U (en) * 2010-06-22 2011-01-12 刘昌贵 Constant current source circuit
CN202384752U (en) * 2011-12-15 2012-08-15 安徽华东光电技术研究所 Switching power supply overcurrent protection circuit
CN102891609A (en) * 2012-11-01 2013-01-23 东文高压电源(天津)有限公司 Negative polarity fixed output high-voltage power circuit consisting of TL431

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105743059A (en) * 2016-02-19 2016-07-06 中国兵器工业集团第二一四研究所苏州研发中心 Output over-current protection circuit formed by reference source and resistor
CN105977921A (en) * 2016-06-27 2016-09-28 中国兵器工业集团第二四研究所苏州研发中心 Isolation power supply overcurrent turn-off delay protection circuit
CN105977921B (en) * 2016-06-27 2018-06-05 中国兵器工业集团第二一四研究所苏州研发中心 A kind of isolated power supply overcurrent turn-off function delay protection circuit
CN106300952A (en) * 2016-11-02 2017-01-04 东莞市石龙富华电子有限公司 The soft-start method of a kind of inefficiency loss power output end Anti-surging and circuit
CN110632442A (en) * 2019-10-10 2019-12-31 华东光电集成器件研究所 Capacitor aging leakage detection power-off protection circuit
CN110632442B (en) * 2019-10-10 2021-11-23 华东光电集成器件研究所 Capacitor aging leakage detection power-off protection circuit

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Effective date of registration: 20180813

Address after: 233030 2016 Tang He road, Bengbu, Anhui

Patentee after: Huadong Photoelectric Integrated Device Research Institute

Address before: 215163 No. 89 Longshan Road, hi tech Zone, Suzhou, Jiangsu

Patentee before: China North Industries Group Corporation No.214 Research Institute Suzhou R&D Center

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