CN102769273A - Switch power source output overcurrent protection device - Google Patents
Switch power source output overcurrent protection device Download PDFInfo
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- CN102769273A CN102769273A CN2012102704823A CN201210270482A CN102769273A CN 102769273 A CN102769273 A CN 102769273A CN 2012102704823 A CN2012102704823 A CN 2012102704823A CN 201210270482 A CN201210270482 A CN 201210270482A CN 102769273 A CN102769273 A CN 102769273A
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Abstract
The invention relates to a switch power source output overcurrent protection device which comprises a current detection module, an amplifier, a comparator, a switch control module and an isolation control module. The isolation control module is connected with a switch power source, the current detection module comprises a Hall current sensor, current flows through the Hall current sensor to generate a voltage signal, the Hall current sensor outputs the voltage signal to the amplifier, reference voltage is inputted to an input end of the comparator , and the voltage signal is input into the comparator to be compared with the reference voltage after amplified by the amplifier into an amplified voltage signal, the switch control module is started up to connect the isolation control module to control a switch power source to be switched off when the amplified voltage signal is larger than the reference voltage. The Hall current sensor is adopted to detect output current of a power source module, current output by a power source flows through an inductor, and direct-current impedance is quite small, so that a function of low loss is realized; and numerical value accuracy of the detected current is high, so that reliability of the power source is improved.
Description
Technical field
The present invention relates to a kind of Switching Power Supply output overcurrent protective device.
Background technology
Traditional DC/DC power supply output overcurrent protection is through resistance sampling voltage, makes controller close main switch through amplifying circuit, feedback circuit again, thereby plays the effect of overcurrent protection.Specifically, overcurrent protective device is the resistance sampling pattern, and electric current flows through power resistor and produces voltage drop, and voltage value produces a voltage through amplifier, comparator and controls optocoupler and isolate the shutoff controller, plays the overcurrent turn-off function.The deficiency of this pattern has: 1, electric current flows through power resistor has power loss, influences the conversion efficiency of whole power supply; 2, power resistor has temperature drift coefficient, and when power loss, resistance heats up, and it is big that resistance becomes, and the current values precision of overcurrent protection is relatively poor.
The overcurrent protection that also has is through the signal transformer sampling, but can only detect the peak values of ac electric current, and the direct current overcurrent can not detect continuously.
For example the patent No. is the disclosed multifunction switch apparatus for protecting power supply of 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) is formed; Wherein current detection circuit (1) is by current sense resistor RS, and resistance K and capacitor P are formed; Overvoltage crowbar (2) is made up of resistance R M, resistance R M one 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 one termination 38 Series P WM controllers, 3 pins of another termination 38 Series P WM controllers; Under-voltage and o-volt protection circuit (4) is by resistance R H, resistance L, and resistance R F, comparison circuit U2 constitutes; Soft starting circuit (5) is made up of under-voltage and o-volt protection circuit (4) and capacitor C 2 jointly, and C2 is parallel to resistance L two ends, and short-circuit protection circuit (6) is by resistance V1, resistance M1, and resistance M2, resistance R V, resistance V2, diode D1, D2, capacitor C 3, comparison circuit U2 constitutes; Drive circuit (7) is made up of pull-up resistor V3 and triode Q2; Pull-up resistor V3 one termination voltage VCC, the other end and U2 comparison circuit output 20UT link together, and insert triode Q2 base stage; Triode Q2 emitter connects 1 pin of 38 Series P WM controllers, triode Q2 grounded collector; Regulate resistance V4 and be used for 38 Series P WM controllers 3803,3800 and 2803,2800 series, a termination U2 comparison circuit 2IN+, other end ground connection.The current foldback circuit of this invention is a resistance sampling current peak pattern, and is cycle turn-off protection pattern.
Summary of the invention
The purpose of this invention is to provide a kind of Switching Power Supply output overcurrent protective device that solves the high power loss of traditional overcurrent protection and detect the low problem of current precision.
For achieving the above object, the technical scheme that the present invention adopts is:
A kind of Switching Power Supply output overcurrent protective device; The output that is connected in Switching Power Supply is used as overcurrent protection; It comprises the current detection module of the output that is arranged at described Switching Power Supply, the amplifier that is connected with the output of described current detection module, the comparator that is connected with the output of described amplifier, the switch control module that is connected with the output of described comparator, the isolated controlling module that is 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; Flowed through described Hall current sensor and made described Hall current sensor produce voltage signal by the electric current of described Switching Power Supply output, described Hall current sensor is exported described voltage signal to described amplifier;
The input of described comparator has also been imported reference voltage, and described voltage signal is imported in the described comparator and compared with described reference voltage after described amplifier is enlarged into amplification voltage signal; When described amplification voltage signal during greater than described reference voltage, described switch control module is opened and is made the conducting of described isolated controlling module, turn-offs thereby control described Switching Power Supply.
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 the grounded emitter of described switch triode with described isolated controlling module.
Preferably, described Switching Power Supply comprises former limit controller, by the main switch of described former limit controller control, and 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, and described current output terminal tieback is to described Switching Power Supply output ground, and described earth terminal is connected with the output ground end of described Switching Power Supply; 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, produces magnetic field intensity B, perpendicular to this magnetic direction one Hall plate is set, and Hall plate flows through fixing electric current I perpendicular to magnetic direction
H, then Hall plate is at the same time perpendicular to producing Hall voltage U on the direction of the magnetic direction and the sense of current
H, Hall voltage U
HB is proportional with magnetic field intensity, and magnetic field intensity B is proportional with electric current I again, so U
HBe directly proportional with electric current I, through detecting U
HNumerical value just can calculate electric current I numerical value.Formula U
H=B/ (K
H* I
H), K
HBe hall sensitivity.
Because technique scheme utilization; The present invention compared with prior art has advantage: 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, has realized low-loss function.Electric current flows through inductance and produces magnetic field intensity B, and it is little that the temperature of magnetic field intensity B is floated coefficient ratio resistance, so measure the height of the numerical precision of electric current than resistance-type.Improved the reliability of power supply from these two this Switching Power Supply of aspect explanation output overcurrent protective devices.
Description of drawings
Accompanying drawing 1 is the theory diagram of Switching Power Supply output overcurrent protective device of the present invention.
Accompanying drawing 2 is the circuit theory diagrams of Switching Power Supply output overcurrent protective device of the present invention.
Embodiment
Below in conjunction with embodiment shown in the drawings the present invention is further described.
Embodiment one: shown in accompanying drawing 1.
A kind of Switching Power Supply output overcurrent protective device, the output that is connected in Switching Power Supply is used as overcurrent protection.The isolated controlling module (optocoupler and voltage stabilizing circuit are formed) that it comprises the current detection module of the output that is arranged at Switching Power Supply, the amplifier that is connected with the output of current detection module, the comparator that is connected with the output of amplifier, the switch control module that is connected with the output of comparator, is connected with the output of switch control module; The isolated controlling module is connected with the controller of Switching Power Supply; Current detection module comprises Hall current sensor; Flowed through Hall current sensor and made Hall current sensor produce voltage signal by the electric current of Switching Power Supply output, Hall current sensor outputs voltage signal to amplifier.
The input of comparator is also imported reference voltage (thresholding of setting), and voltage signal is compared with reference voltage in the input comparator after amplifier is enlarged into amplification voltage signal; When amplification voltage signal during greater than reference voltage, switch control module is opened and is made the conducting of isolated controlling module, is turn-offed by the controller control switching of Switching Power Supply.
Shown in accompanying drawing 2; N1 is a Hall current sensor, and Hall current sensor N1 comprises current input terminal, current output terminal, voltage output end, earth terminal, power end, and current input terminal is connected with the output ground end of Switching Power Supply; The output of current output terminal tieback to Switching Power Supply internally; Earth terminal links to each other with the output ground end of Switching Power Supply, and power supply Vc end is connected with voltage output Vo end, and the voltage output end of N1 is connected to amplifier in.The N2A amplifier, the one of which end is connected with Hall current sensor N1, and the other end is connected with ground through resistance.The supply power voltage of Hall current sensor N1 and amplifier N2A all is that the output voltage V o by Switching Power Supply provides.GNDo be the output ground of voltage also be the current input terminal of Hall current sensor N1, electric current I o is back to power module through the 8 pin output of current sensor N1.When electric current I o, 11 pin of Hall current sensor output small voltage signal, input amplifier N2A carries out the signal amplification again, exports big voltage signal, and voltage can be found out the size of Io thus.
The reference voltage that big voltage signal and voltage-stabiliser tube VD310 constitute is input to comparator N2B and compares.When amplification voltage signal during, open switch control module greater than reference voltage.Switch control module comprises switch triode and delay electric capacity C10, and the base stage of switch triode is connected with comparator N2B output, and the collector electrode of switch triode is connected with the isolated controlling module, the grounded emitter of switch triode.Switching Power Supply comprises former limit controller, controls main switch by former limit controller.The isolated controlling module is connected with former limit controller, and the isolated controlling module comprises optocoupler G1 and voltage stabilizing circuit.When switch triode is opened, make the big current lead-through of optocoupler G1, thereby close main switch through the former limit controller of power module, play the function of power module output overcurrent turn-off protection.
This Switching Power Supply output overcurrent protective device has solved the high power loss and the low problem of detection current precision of traditional overcurrent protection.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (6)
1. Switching Power Supply output overcurrent protective device; The output that is connected in Switching Power Supply is used as overcurrent protection; It comprises the current detection module of the output that is arranged at described Switching Power Supply, the amplifier that is connected with the output of described current detection module, the comparator that is connected with the output of described amplifier, the switch control module that is connected with the output of described comparator, the isolated controlling module that is 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; Flowed through described Hall current sensor and made described Hall current sensor produce voltage signal by the electric current of described Switching Power Supply output, described Hall current sensor is exported described voltage signal to described amplifier;
The input of described comparator has also been imported reference voltage, and described voltage signal is imported in the described comparator and compared with described reference voltage after described amplifier is enlarged into amplification voltage signal; When described amplification voltage signal during greater than described reference voltage, described switch control module is opened and is made the conducting of described isolated controlling module, turn-offs thereby control described Switching Power Supply.
2. Switching Power Supply output overcurrent protective device according to claim 1, it is characterized in that: described switch control module comprises switch triode.
3. Switching Power Supply output overcurrent protective device according to claim 2; It is characterized in that: the base stage of described switch triode is connected with described comparator; The collector electrode of described switch triode is connected the grounded emitter of described switch triode with described isolated controlling module.
4. Switching Power Supply output overcurrent protective device according to claim 1; It is characterized in that: described Switching Power Supply comprises former limit controller, by the main switch of described former limit controller control, and described isolated controlling module is connected with described former limit controller.
5. Switching Power Supply output overcurrent protective 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 described Switching Power Supply output ground; Described earth terminal is connected with the output ground end of described Switching Power Supply, and described power end is connected with described voltage output end, and described voltage output end is connected to described amplifier.
6. Switching Power Supply output overcurrent protective device according to claim 1 is characterized in that: described isolated controlling module comprises optocoupler, voltage stabilizing circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210270482.3A CN102769273B (en) | 2012-08-01 | 2012-08-01 | Switch power source output overcurrent protection device |
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| CN201210270482.3A CN102769273B (en) | 2012-08-01 | 2012-08-01 | Switch power source output overcurrent protection device |
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| CN102769273B CN102769273B (en) | 2015-11-25 |
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Cited By (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 |
| CN105451385A (en) * | 2014-08-07 | 2016-03-30 | 佛山市顺德区美的电热电器制造有限公司 | Cooking device having function of over-current protection |
| CN107132408A (en) * | 2017-06-28 | 2017-09-05 | 同济大学 | Commercial electric detonator tube resistor safety instrumentation and method |
| 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 |
| 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 |
| CN109888725A (en) * | 2019-02-25 | 2019-06-14 | 西安微电子技术研究所 | A kind of D.C. high-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 |
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Cited By (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 |
| CN105451385A (en) * | 2014-08-07 | 2016-03-30 | 佛山市顺德区美的电热电器制造有限公司 | Cooking device having function of over-current protection |
| 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 |
| CN109888725A (en) * | 2019-02-25 | 2019-06-14 | 西安微电子技术研究所 | A kind of D.C. high-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 |
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|---|---|
| CN102769273B (en) | 2015-11-25 |
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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 |