CN102769273B - Switch power source output overcurrent protection device - Google Patents
Switch power source output overcurrent protection device Download PDFInfo
- Publication number
- CN102769273B CN102769273B CN201210270482.3A CN201210270482A CN102769273B CN 102769273 B CN102769273 B CN 102769273B CN 201210270482 A CN201210270482 A CN 201210270482A CN 102769273 B CN102769273 B CN 102769273B
- Authority
- CN
- China
- Prior art keywords
- output
- power supply
- switch
- voltage
- switching power
- 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.)
- Active
Links
Abstract
The present invention relates to a kind of switch power source output overcurrent protection device, it comprises current detection module, amplifier, comparator, switch control module, isolated controlling module, isolated controlling module is connected with Switching Power Supply, current detection module comprises Hall current sensor, electric current flows through Hall current sensor and produces voltage signal, and Hall current sensor outputs voltage signal to amplifier; The input of comparator has also inputted reference voltage, and voltage signal is enlarged into after amplification voltage signal, in input comparator compared with reference voltage through amplifier; When amplification voltage signal is greater than reference voltage, switch control module is opened and makes the conducting of isolated controlling module, thus control switch power remove.The present invention adopts Hall current sensor to detect the output current of power module, and electric power outputting current flows through the inductance of setting, and DC impedance is very little, achieves low-loss function, and the numerical precision measuring electric current is higher, improves the reliability of power supply.
Description
Technical field
The present invention relates to a kind of switch power source output overcurrent protection device.
Background technology
Traditional DC/DC power supply output overcurrent protection is by resistance sampling voltage, then makes controller close main switch by amplifying circuit, feedback circuit, thus plays the effect of overcurrent protection.Specifically, overcurrent protective device is resistance sampling pattern, and electric current flows through power resistor and produces voltage drop, and voltage value produces a voltage by amplifier, comparator and controls optocoupler and isolate shutoff controller, plays overcurrent turn-off function function.The deficiency of this pattern has: 1, electric current flows through power resistor power loss, affects the conversion efficiency of whole power supply; 2, power resistor has temperature drift coefficient, and when power loss, resistance heats up, and resistance becomes large, and the current values precision of overcurrent protection is poor.
The overcurrent protection also had is sampled by signal transformer, but can only detect peak values of ac electric current, and continuous direct current overcurrent can not detect.
The such as patent No. is the multifunction switch apparatus for protecting power supply disclosed in CN200820134621.9.This multifunction switch apparatus for protecting power supply, it is by current detection circuit (1), overvoltage crowbar (2), current foldback circuit (3), under-voltage and o-volt protection circuit (4), soft starting circuit (5), overload and short-circuit protection circuit (6), and drive circuit (7) forms; Wherein current detection circuit (1) is by current sense resistor RS, and resistance K and electric capacity P forms; Overvoltage crowbar (2) is made up of resistance RM, resistance RM mono-termination power input INPUT+, and the other end is connected with 3 pins of 38 Series P WM controllers; Current foldback circuit (3) is made up of resistance N, 8 pins of resistance N mono-termination 38 Series P WM controller, 3 pins of another termination 38 Series P WM controller; Under-voltage and o-volt protection circuit (4) is by resistance RH, and resistance L, resistance RF, comparison circuit U2 are formed; Soft starting circuit (5) is made up of jointly under-voltage and o-volt protection circuit (4) and electric capacity C2, C2 is parallel to resistance L two ends, short-circuit protection circuit (6) by resistance V1, resistance M1, resistance M2, resistance RV, resistance V2, diode D1, D2, electric capacity C3, comparison circuit U2 are formed; Drive circuit (7) is made up of pull-up resistor V3 and triode Q2, pull-up resistor V3 mono-termination voltage VCC, the other end and U2 comparison circuit export 20UT and link together, access triode Q2 base stage, triode Q2 emitter connects 1 pin of 38 Series P WM controllers, triode Q2 grounded collector; Regulating resistance V4 is used for 38 Series P WM controller 3803,3800 and 2803,2800 series, a termination U2 comparison circuit 2IN+, other end ground connection.The current foldback circuit of this invention is resistance sampling current peak pattern, and is cycle turn-off protection pattern.
Summary of the invention
The object of this invention is to provide and a kind ofly solve the high power loss of conventional overcurrent protection and detect the switch power source output overcurrent protection device of the low problem of current precision.
For achieving the above object, the technical solution used in the present invention is:
A kind of switch power source output overcurrent protection device, the output being connected to Switching Power Supply is used as overcurrent protection, it comprises the current detection module of the output being arranged at described Switching Power Supply, the amplifier be connected with the output of described current detection module, the comparator be connected with the output of described amplifier, the switch control module be connected with the output of described comparator, the isolated controlling module be connected with the output of described switch control module, described isolated controlling module is connected with described Switching Power Supply, described current detection module comprises Hall current sensor, the electric current exported by described Switching Power Supply flows through described Hall current sensor and makes described Hall current sensor produce voltage signal, voltage signal described in described Hall current sensor exports is to described amplifier,
The input of described comparator has also inputted reference voltage, described voltage signal after described amplifier is enlarged into amplification voltage signal, in the comparator described in input compared with described reference voltage; When described amplification voltage signal is greater than described reference voltage, described switch control module is opened and makes described isolated controlling module conducting, thus the Switching Power Supply described in controlling turns off.
Preferably, described switch control module comprises switch triode.
Preferably, the base stage of described switch triode is connected with described comparator, and the collector electrode of described switch triode is connected with described isolated controlling module, the grounded emitter of described switch triode.
Preferably, the main switch that described Switching Power Supply comprises former limit controller, controlled by described former limit controller, described isolated controlling module is connected with described former limit controller.
Preferably, described Hall current sensor comprises current input terminal, current output terminal, voltage output end, earth terminal, power end, described current input terminal is connected with the output of described Switching Power Supply, described current output terminal tieback exports ground to described Switching Power Supply, described earth terminal is held with the output ground of described Switching Power Supply and is connected, described power end is connected with described voltage output end, and described voltage output end is connected to described amplifier.
Preferably, described isolated controlling module comprises optocoupler, voltage stabilizing circuit.
Operation principle of the present invention is: electric current I flows through the internal inductance of Hall current sensor, and produce magnetic field intensity B, arrange a Hall plate perpendicular to this magnetic direction, Hall plate flows through fixing electric current I perpendicular to magnetic direction
h, then Hall plate produces Hall voltage U perpendicular on the direction of magnetic direction and the sense of current at the same time
h, Hall voltage U
hproportional with magnetic field intensity B, magnetic field intensity B is proportional with electric current I again, so U
hbe directly proportional with electric current I, by detecting U
hnumerical value just can calculate electric current I numerical value.Formula U
h=B/(K
h* I
h), K
hfor hall sensitivity.
Because technique scheme is used, the present invention compared with prior art has following advantages: the present invention adopts Hall current sensor to detect the output current (AC and DC can) of power module, electric power outputting current flows through the inductance of setting, DC impedance is very little, achieves low-loss function.The temperature drift coefficient ratio resistance that electric current flows through inductance generation magnetic field intensity B, magnetic field intensity B is little, so measure the high of the numerical precision ratio resistance formula of electric current.Illustrate that this switch power source output overcurrent protection device improves the reliability of power supply from these two aspects.
Accompanying drawing explanation
Accompanying drawing 1 is the theory diagram of switch power source output overcurrent protection device of the present invention.
Accompanying drawing 2 is the circuit theory diagrams of switch power source output overcurrent protection device of the present invention.
Embodiment
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
Embodiment one: shown in accompanying drawing 1.
A kind of switch power source output overcurrent protection device, the output being connected to Switching Power Supply is used as overcurrent protection.It comprises the current detection module of the output being arranged at Switching Power Supply, the amplifier be connected with the output of current detection module, the comparator be connected with the output of amplifier, the switch control module be connected with the output of comparator, the isolated controlling module (optocoupler and voltage stabilizing circuit form) be connected with the output of switch control module, isolated controlling module is connected with the controller of Switching Power Supply, current detection module comprises Hall current sensor, the electric current exported by Switching Power Supply flows through Hall current sensor and makes Hall current sensor produce voltage signal, Hall current sensor outputs voltage signal to amplifier.
The input of comparator also inputs reference voltage (thresholding of setting), and voltage signal is enlarged into after amplification voltage signal, in input comparator compared with reference voltage through amplifier; When amplification voltage signal is greater than reference voltage, switch control module is opened and makes the conducting of isolated controlling module, by the controller control switch power remove of Switching Power Supply.
Shown in accompanying drawing 2, N1 is Hall current sensor, Hall current sensor N1 comprises current input terminal, current output terminal, voltage output end, earth terminal, power end, current input terminal is held with the output ground of Switching Power Supply and is connected, current output terminal tieback exports internally to Switching Power Supply, hold to the output of earth terminal and Switching Power Supply and be connected, power supply Vc holds and voltage exports Vo and holds and be connected, and the voltage output end of N1 is connected to amplifier in.N2A amplifier, its one end is connected with Hall current sensor N1, and the other end is connected to the ground by resistance and connects.The supply power voltage of Hall current sensor N1 and amplifier N2A is all provided by the output voltage Vo of Switching Power Supply.GNDo is the output ground of voltage is also the current input terminal of Hall current sensor N1, and electric current I o exports through 8 pin of current sensor N1, is back to power module.When there being electric current I o, 11 pin of Hall current sensor export small voltage signal, then input amplifier N2A carries out signal amplification, exports large voltage signal, and voltage can find out the size of Io thus.
The reference voltage that large voltage signal and voltage-stabiliser tube VD310 are formed is input to comparator N2B and compares.When amplification voltage signal is greater than reference voltage, opening switch control module.Switch control module comprises switch triode and postpones electric capacity C10, and the base stage of switch triode exports with comparator N2B and is connected, and the collector electrode of switch triode is connected with isolated controlling module, the grounded emitter of switch triode.Switching Power Supply comprises former limit controller, controls main switch by former limit controller.Isolated controlling module is connected with former limit controller, and isolated controlling module comprises optocoupler G1 and voltage stabilizing circuit.When switch triode is opened, make the conducting of optocoupler G1 big current, thus close main switch by the former limit controller of power module, play the function that power module exports overcurrent turn-off protection.
This switch power source output overcurrent protection device solves the high power loss of conventional overcurrent protection and detects the low problem of current precision.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (3)
1. a switch power source output overcurrent protection device, the output being connected to Switching Power Supply is used as overcurrent protection, it comprises the current detection module of the output being arranged at described Switching Power Supply, the amplifier be connected with the output of described current detection module, the comparator be connected with the output of described amplifier, the switch control module be connected with the output of described comparator, the isolated controlling module be connected with the output of described switch control module, described isolated controlling module is connected with described Switching Power Supply, it is characterized in that: described current detection module comprises Hall current sensor, the electric current exported by described Switching Power Supply flows through described Hall current sensor and makes described Hall current sensor produce voltage signal, voltage signal described in described Hall current sensor exports is to described amplifier,
The input of described comparator has also inputted reference voltage, and described reference voltage is made up of voltage-stabiliser tube, described voltage signal after described amplifier is enlarged into amplification voltage signal, in the comparator described in input compared with described reference voltage; When described amplification voltage signal is greater than described reference voltage, described switch control module is opened and makes described isolated controlling module conducting, thus the Switching Power Supply described in controlling turns off;
Described switch control module comprises switch triode and postpones electric capacity; The base stage of described switch triode is connected with described comparator, the collector electrode of described switch triode is connected with described isolated controlling module, the grounded emitter of described switch triode, between the base stage that described delay electric capacity is connected to described switch triode and emitter;
Described isolated controlling module comprises optocoupler, voltage stabilizing circuit.
2. switch power source output overcurrent protection device according to claim 1; it is characterized in that: the main switch that described Switching Power Supply comprises former limit controller, controlled by described former limit controller, described isolated controlling module is connected with described former limit controller.
3. switch power source output overcurrent protection device according to claim 1, it is characterized in that: described Hall current sensor comprises current input terminal, current output terminal, voltage output end, earth terminal, power end, described current input terminal is connected with the output of described Switching Power Supply, described current output terminal tieback is to the output ground end of described Switching Power Supply, described earth terminal is held with the output ground of described Switching Power Supply and is connected, described power end is connected with described voltage output end, described voltage output end is connected to described amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210270482.3A CN102769273B (en) | 2012-08-01 | 2012-08-01 | Switch power source output overcurrent protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210270482.3A CN102769273B (en) | 2012-08-01 | 2012-08-01 | Switch power source output overcurrent protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102769273A CN102769273A (en) | 2012-11-07 |
| CN102769273B true CN102769273B (en) | 2015-11-25 |
Family
ID=47096565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210270482.3A Active CN102769273B (en) | 2012-08-01 | 2012-08-01 | Switch power source output overcurrent protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102769273B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078296A (en) * | 2013-01-25 | 2013-05-01 | 广东志高暖通设备股份有限公司 | Current detection control circuit for direct current bus |
| CN105451385B (en) * | 2014-08-07 | 2019-03-12 | 佛山市顺德区美的电热电器制造有限公司 | The cooking equipment for having overcurrent protection function |
| CN107231095A (en) * | 2016-03-23 | 2017-10-03 | 江苏美联集团有限公司 | A kind of reponse system based on dc bus |
| CN107132408A (en) * | 2017-06-28 | 2017-09-05 | 同济大学 | Commercial electric detonator tube resistor safety instrumentation and method |
| CN108444515A (en) * | 2018-03-14 | 2018-08-24 | 无锡思泰迪半导体有限公司 | It is a kind of to cross threshold detection circuit applied to the quick of switch modulation signal |
| CN109888725B (en) * | 2019-02-25 | 2020-12-29 | 西安微电子技术研究所 | Direct-current large-current short-circuit protection circuit and method |
| CN109921386A (en) * | 2019-04-24 | 2019-06-21 | 浙江鲲悟科技有限公司 | The current foldback circuit and method of pfc converter |
| CN111069813A (en) * | 2019-12-31 | 2020-04-28 | 中山市鹰飞电器有限公司 | Sheet metal repairing machine with automatic welding function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201113789Y (en) * | 2007-08-28 | 2008-09-10 | 比亚迪股份有限公司 | DC-DC converter |
| CN201149987Y (en) * | 2008-01-22 | 2008-11-12 | 环隆电气股份有限公司 | Overvoltage protection apparatus |
| CN101471562A (en) * | 2007-12-28 | 2009-07-01 | 中国航天科技集团公司第五研究院第五一〇研究所 | Protective circuit for locking single particle |
| CN201766400U (en) * | 2010-01-30 | 2011-03-16 | 西北师范大学 | High-power intelligent control circuit for switch power charger |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200845529A (en) * | 2007-05-11 | 2008-11-16 | Richtek Technology Corp | An apparatus and method for utilizing an auxiliary coil in an isolation voltage-converter to accomplish multiple functions and protections |
-
2012
- 2012-08-01 CN CN201210270482.3A patent/CN102769273B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201113789Y (en) * | 2007-08-28 | 2008-09-10 | 比亚迪股份有限公司 | DC-DC converter |
| CN101471562A (en) * | 2007-12-28 | 2009-07-01 | 中国航天科技集团公司第五研究院第五一〇研究所 | Protective circuit for locking single particle |
| CN201149987Y (en) * | 2008-01-22 | 2008-11-12 | 环隆电气股份有限公司 | Overvoltage protection apparatus |
| CN201766400U (en) * | 2010-01-30 | 2011-03-16 | 西北师范大学 | High-power intelligent control circuit for switch power charger |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102769273A (en) | 2012-11-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102769273B (en) | Switch power source output overcurrent protection device | |
| CN103973114B (en) | A kind of DC source of power limitation control | |
| CN101923111B (en) | Isolation detection circuit of DC bus voltage | |
| CN203026904U (en) | Over-current protection circuit and PFC (power factor correction) control circuit with same | |
| CN206225983U (en) | Over-voltage over-current protection circuit | |
| CN107895931A (en) | A kind of no-voltage opens the switch implementation method closed with zero current | |
| CN204391679U (en) | A kind of leakage current detection protection circuit | |
| CN110350773A (en) | A kind of current sample and limiting circuit of four switches Buck-Boost converter | |
| CN105223533A (en) | A kind of superhigh precision responds DC current prover circuit fast | |
| CN205123588U (en) | It turns over to keep apart swashs formula high frequency switching power supply and input voltage detection circuitry thereof | |
| CN207490887U (en) | IGBT high-frequency soft switch drives thick film | |
| CN103647447B (en) | The supply unit of a kind of electric energy table communication module | |
| CN202978247U (en) | Overcurrent protection circuit | |
| CN102593713B (en) | Circuit for simulating automatic power control of semiconductor laser | |
| CN105553245A (en) | Soft start circuit | |
| CN201819945U (en) | Isolated direct current (DC) bus voltage detection circuit for inverter air-conditioner | |
| CN204651904U (en) | The protective circuit of power supply unit | |
| CN203870150U (en) | Isolation type power grid detector | |
| CN203504787U (en) | Electromagnetic heating circuit and electric pressure cooker | |
| CN203719790U (en) | NTC identification circuit with high return difference | |
| CN201541115U (en) | Intelligent controller with voltage protection module | |
| CN209030117U (en) | A kind of single-phase Sinusoidal Inverter system adjusted based on feed forward approach | |
| CN102043080A (en) | Current sampling method and current sampling circuit of high-frequency charger | |
| CN202405740U (en) | Current-limiting protection circuit of alternating current power supply loop | |
| CN108809069A (en) | A kind of monocycle peak current limit circuit |
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 | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
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 |