CN204068682U - A kind of high-power low-loss surge restraint circuit - Google Patents

A kind of high-power low-loss surge restraint circuit Download PDF

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Publication number
CN204068682U
CN204068682U CN201420478731.2U CN201420478731U CN204068682U CN 204068682 U CN204068682 U CN 204068682U CN 201420478731 U CN201420478731 U CN 201420478731U CN 204068682 U CN204068682 U CN 204068682U
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CN
China
Prior art keywords
resistance
filter capacitor
module
transistor
surge restraint
Prior art date
Application number
CN201420478731.2U
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Chinese (zh)
Inventor
陈朝滨
李金兰
谭志刚
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成都四威航空电源有限公司
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Priority to CN201420478731.2U priority Critical patent/CN204068682U/en
Application granted granted Critical
Publication of CN204068682U publication Critical patent/CN204068682U/en

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Abstract

The utility model discloses a kind of high-power low-loss surge restraint circuit, comprise rectification module, current limliting module, control module and filter capacitor; Current limliting block coupled in series is between the cathode output end and the negative polarity end of filter capacitor of rectification module; The positive ends of filter capacitor is connected to the cathode output end of rectification module; Control module is connected with filter capacitor with rectification module, current limliting module respectively.Adopt above-mentioned surge restraint circuit to utilize N-type field effect transistor to substitute relay in existing surge restraint circuit, its switch life is much larger than mechanical relay switch; Utilize resistance capacitance and voltage stabilizing didoe to replace complex structure in existing surge restraint circuit, bulky control circuit, have that control mode is simple, the feature of small volume.

Description

A kind of high-power low-loss surge restraint circuit
Technical field
The utility model relates to a kind of surge restraint circuit, particularly relates to a kind of high-power low-loss surge restraint circuit.
Background technology
The power that existing design is produced is more than in the AC/DC Switching Power Supply of 1KW, suppression circuit for power-on surge current adopts input and load to seal in fixed resistance usually, at resistance two ends, relay in parallel is as Fig. 1, after electric capacity E1 charges to certain voltage, control relay is resistive short, shortcoming is along with several to dozens of contact bouncings and dither process in switching process, singlely tremble the jumping time and can reach tens delicate to several milliseconds, therefore return the misoperation causing charged power.Control circuit (control circuit) complex structure, not only needs independent accessory power supply to power, and needs the function such as voltage sample, time delay.High power relay useful life is short, bulky and take more space.The anti-vibration magnitude of mechanical relay also cannot meet the large platform of oscillation intensity as airborne, missile-borne, the platform such as carrier-borne.
Utility model content
The purpose of this utility model is to provide a kind of high-power low-loss surge restraint circuit, to solve short, complex structure and bulky shortcoming in existing surge restraint circuit useful life.
For solving the problems of the technologies described above, the utility model provides a kind of high-power low-loss surge restraint circuit, comprises rectification module, current limliting module, control module and filter capacitor; Current limliting block coupled in series is between the cathode output end and the negative polarity end of filter capacitor of rectification module; The positive ends of filter capacitor is connected to the cathode output end of rectification module.
Current limliting module comprises transistor, is provided with the second resistance between the source electrode of transistor and drain electrode; The source electrode of transistor is connected to the negative polarity end of rectification module; The drain electrode of transistor is connected to the cathode output end of filter capacitor.
Control module comprises electric capacity, voltage-stabiliser tube, the first resistance and the 3rd resistance; One end of first resistance is connected with the grid of transistor; Between the other end that electric capacity, voltage-stabiliser tube, the 3rd resistance are parallel to the first resistance respectively and the source electrode of transistor; Some resistance be sequentially connected in series is provided with between the other end of the first resistance and the positive ends of filter capacitor.
Further, rectification module is full bridge rectifier.
Further, some resistance be sequentially connected in series comprises the 4th resistance, the 5th resistance and the 6th resistance that are sequentially connected in series.
Further, transistor is N-MOSFET.
This practical new beneficial effect is: the utility model utilizes N-MOSFET to substitute relay in existing surge restraint circuit, and its switch life is much larger than mechanical relay switch; Utilize resistance capacitance and voltage stabilizing didoe to replace complex structure in existing surge restraint circuit, bulky control circuit, have that control mode is simple, the feature of small volume.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that existing power-on surge current suppresses circuit;
Fig. 2 is the circuit diagram of the utility model most preferred embodiment;
Fig. 3 is the circuit diagram of another embodiment of the utility model.
Embodiment
Below embodiment of the present utility model is described; so that those skilled in the art understand the utility model; but should be clear; the utility model is not limited to the scope of embodiment; to those skilled in the art; as long as various change to limit and in the spirit and scope of the present utility model determined, these changes are apparent, and all innovation and creation utilizing the utility model to conceive are all at the row of protection in appended claim.
A kind of high-power low-loss surge restraint circuit, comprises rectification module, current limliting module, control module and filter capacitor E1; Wherein, rectification module is full bridge rectifier.Current limliting block coupled in series is between the cathode output end and the negative polarity end of filter capacitor E1 of rectification module; The positive ends of filter capacitor E1 is connected to the cathode output end of rectification module.
Current limliting module comprises transistor Q1, is provided with the second resistance R2 between the source electrode of transistor Q1 and drain electrode; The source electrode of transistor Q1 is connected to the negative polarity end of rectification module; The drain electrode of transistor Q1 is connected to the cathode output end of filter capacitor E1.
Control module comprises electric capacity C1, voltage-stabiliser tube D1, the first resistance R1 and the 3rd resistance R3; One end of first resistance R1 is connected with the grid of transistor Q1; Between the other end that electric capacity C1, voltage-stabiliser tube D1, the 3rd resistance R3 are parallel to the first resistance R1 respectively and the source electrode of transistor Q1; Some resistance be sequentially connected in series is provided with between the other end of the first resistance R1 and the positive ends of filter capacitor E1.
In the present embodiment, the resistance arranged between the other end of the first resistance R1 and the positive ends of filter capacitor E1 is the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 that are once connected in series.Apparently, the resistance number be herein sequentially connected in series is variable.
In addition, the transistor Q1 adopted in this enforcement is N-MOSFET.
Transistor Q1 is voltage-type device, and when its gate source voltage reaches its threshold voltage, transistor Q1 is completely open-minded, now conducting internal resistance Ron is very little, and its loss power formula is as being P=I|I|Ron, and wherein I is the rated current of power supply when normally working.So as can be seen here, now power loss is on transistor q 1 very little.
In start process, as long as the gate source voltage of transistor Q1 is less than its threshold voltage, transistor Q1 is just in incomplete conducting state, and its internal resistance is much larger than the second resistance R2, and now almost all electric current charges to filter capacitor E1 through the second resistance R2.The maximum of power-on surge current is determined by the size of the second resistance R2.Its computing formula is be wherein the voltage after input AC rectification.Now, the voltage on filter capacitor E1 rises gradually, and electric capacity C1 is by charging circuit R4, and R5, R6 charge, and the voltage on electric capacity C1 rises gradually, and charging interval formula is:.Now determined by capacitance voltage Vc1, until capacitance voltage Vc1 rises to identical with the threshold voltage of transistor Q1, now transistor Q1 is completely open-minded, and its conducting internal resistance Ron is much smaller than the second resistance R2, and the second resistance R2 is approximate to be shorted.Now, the charging current for filter capacitor E1 flows through transistor Q1 until filter capacitor E1 voltage Ve1 rises to.At this moment, the voltage of gate source voltage can not exceed the maximum withstand voltage of transistor Q1.
Computing formula be, Vgs = ve 1 | R 2 R 2 + R 4 + R 5 + R 6 . When voltage stabilizing didoe D1 effect is to prevent input voltage from producing fluctuation, voltage stabilizing didoe D1 can voltage clamping in safe range.The effect of the first resistance R1 prevents transistor Q1 from opening and the switch oscillating that likely formed in closing process.
In more powerful surge restraint circuit application, in order to reduce the hear rate in single field effect transistor, improve the reliability of system, many field effect transistor parallel connections also can be adopted to use, and application circuit is as figure tri-.

Claims (4)

1. a high-power low-loss surge restraint circuit, is characterized in that, comprises rectification module, current limliting module, control module and filter capacitor;
Described current limliting block coupled in series is between the cathode output end and the negative polarity end of described filter capacitor of described rectification module;
The positive ends of described filter capacitor is connected to the cathode output end of described rectification module;
Described current limliting module comprises transistor, is provided with the second resistance between the source electrode of described transistor and drain electrode; The source electrode of described transistor is connected to the negative polarity end of described rectification module; The drain electrode of described transistor is connected to the cathode output end of described filter capacitor;
Described control module comprises electric capacity, voltage-stabiliser tube, the first resistance and the 3rd resistance; One end of described first resistance is connected with the grid of described transistor; Between the other end that described electric capacity, voltage-stabiliser tube, the 3rd resistance are parallel to described first resistance respectively and the source electrode of transistor; Some resistance be sequentially connected in series is provided with between the other end of described first resistance and the positive ends of described filter capacitor.
2. surge restraint circuit according to claim 1, is characterized in that, described rectification module is full bridge rectifier.
3. surge restraint circuit according to claim 1, is characterized in that, described some resistance be sequentially connected in series comprises the 4th resistance, the 5th resistance and the 6th resistance that are sequentially connected in series.
4. surge restraint circuit according to claim 1, is characterized in that, described transistor is N-MOSFET.
CN201420478731.2U 2014-08-23 2014-08-23 A kind of high-power low-loss surge restraint circuit CN204068682U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420478731.2U CN204068682U (en) 2014-08-23 2014-08-23 A kind of high-power low-loss surge restraint circuit

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Application Number Priority Date Filing Date Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105305800A (en) * 2015-11-18 2016-02-03 明纬(广州)电子有限公司 Surge current suppression circuit
CN105356437A (en) * 2015-11-04 2016-02-24 浙江榆阳电子有限公司 Anti-surge circuit
CN106026626A (en) * 2016-06-29 2016-10-12 浪潮集团有限公司 Surge current suppressor based on RC time delay circuit
CN106571737A (en) * 2015-10-12 2017-04-19 珠海格力电器股份有限公司 Surge current eliminating circuit of switching power supply, and switching power supply
CN106787658A (en) * 2016-12-30 2017-05-31 天水七四九电子有限公司 A kind of power-on surge current suppression circuit of temperature work ultra-low loss wide
CN106787867A (en) * 2016-11-30 2017-05-31 上海航天控制技术研究所 A kind of rate gyroscope power supply

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106571737A (en) * 2015-10-12 2017-04-19 珠海格力电器股份有限公司 Surge current eliminating circuit of switching power supply, and switching power supply
CN105356437B (en) * 2015-11-04 2018-09-25 浙江榆阳电子有限公司 A kind of anti-surge circuit
CN105356437A (en) * 2015-11-04 2016-02-24 浙江榆阳电子有限公司 Anti-surge circuit
CN105305800A (en) * 2015-11-18 2016-02-03 明纬(广州)电子有限公司 Surge current suppression circuit
CN106026626A (en) * 2016-06-29 2016-10-12 浪潮集团有限公司 Surge current suppressor based on RC time delay circuit
CN106787867A (en) * 2016-11-30 2017-05-31 上海航天控制技术研究所 A kind of rate gyroscope power supply
CN106787867B (en) * 2016-11-30 2019-09-06 上海航天控制技术研究所 A kind of rate gyroscope power supply
CN106787658A (en) * 2016-12-30 2017-05-31 天水七四九电子有限公司 A kind of power-on surge current suppression circuit of temperature work ultra-low loss wide

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GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: CHENGDU SIWI POWER ELECTRONICS TECHNOLOGY CO., LTD

Free format text: FORMER NAME: CHENGDU SIWI AVIATION POWER SUPPLY CO., LTD.

CP01 Change in the name or title of a patent holder

Address after: 3, No. 1, building 1, building 35, 610091 west slope Su Road, Chengdu, Sichuan

Patentee after: CHENGDU SIWI POWER ELECTRONIC TECHNOLOGY CO., LTD.

Address before: 3, No. 1, building 1, building 35, 610091 west slope Su Road, Chengdu, Sichuan

Patentee before: Chengdu SIWI Aviatic Power Supply Co., Ltd.