CN2840439Y - DC power supply load short-circuit self-restoring circuit - Google Patents

DC power supply load short-circuit self-restoring circuit Download PDF

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Publication number
CN2840439Y
CN2840439Y CN 200520065713 CN200520065713U CN2840439Y CN 2840439 Y CN2840439 Y CN 2840439Y CN 200520065713 CN200520065713 CN 200520065713 CN 200520065713 U CN200520065713 U CN 200520065713U CN 2840439 Y CN2840439 Y CN 2840439Y
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CN
China
Prior art keywords
circuit
effect transistor
load
self
capacitor
Prior art date
Application number
CN 200520065713
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Chinese (zh)
Inventor
林乐民
刘增宏
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深圳桑达百利电器有限公司
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Priority to CN 200520065713 priority Critical patent/CN2840439Y/en
Application granted granted Critical
Publication of CN2840439Y publication Critical patent/CN2840439Y/en

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Abstract

The utility model relates to a DC power supply load short circuit self-restoring circuit which comprises an over-current detection unit (3), a control unit (2) and a controlled switch (5) which are electrically connected orderly, wherein the controlled switch (5) is connected with the positive electrode of a power supply (1) and the corresponding terminal of a load (4). The utility model is characterized in that the utility model also comprises a resistor and a capacitor C4 which are connected in series, one terminal of the utility model is connected with the positive electrode of the power supply through the resistor, and the other terminal is connected with the load through the capacitor C4; one terminal of the capacitor C4 which is connected with the load correspondingly is connected with the control unit. The DC power supply load short circuit self-restoring circuit can detect the instant voltage outputted on one end by the action of manually removing a load short circuit or automatically eliminating a load short circuit by using the electric characteristic of the capacitor, the instant voltage is bigger than that of a charging voltage power supply, and thus a control switch is turned on from a tripping state to realize the load self-starting of a short circuit of a power circuit. The utility model can be widely used in cell protective boards and other products.

Description

A kind of DC power supply load short circuits self-repairing circuit
Technical field
The utility model relates to power supply and power protection, particularly the intelligent protection circuit of DC power supply.
Background technology
At present, common battery protecting circuit, structure adds some Resistor-Capacitor Units by two field-effect transistors (MOSFET) Q1, Q2 and a control IC and constitutes as shown in Figure 1, and the various reserve batteries of optional different manufacturers of this control IC and type are protected integrated IC.The integrated IC of described battery protection is responsible for monitoring cell voltage, and the grid of control Q1, Q2, and Q1, Q2 play on-off action in circuit, controlling the conducting and the shutoff of charge circuit and discharge loop respectively, and its basic functional principle is as follows:
(1) normal operating conditions: when normal charge and discharge, the DSG of the integrated IC of battery protection and CHG pin low level in the circuit, all conductings of field-effect transistor Q1, Q2, Q3.Charging current from export/go into to hold BATERY+ to flow into, through field-effect transistor Q1, Q2 after battery charge by export/go into to hold BATERY-to flow out.During regular picture, electric current through export/go into to hold BATERY-and field-effect transistor Q2, Q1 to flow to battery cathode, its sense of current is opposite with the charging current direction.Because the conducting resistance Rds of field-effect transistor Q1, Q2 is very little, the loss under this state is very little.
(2) additives for overcharge protection: battery is a constant current charge at the initial stage of being recharged; prolongation along with the charging interval; cell voltage also can rise; in this process, reach and overcharge when detecting voltage (this numerical value is by the integrated IC decision of battery protection) when the integrated IC of battery protection detects cell voltage; then the CHG pin transfers high voltage to by low-voltage; making the field-effect transistor Q2 grid of control charging is off state, thereby cuts off charge circuit, charger can't be charged to battery play a protective role.
(3) over: over is to stop load discharge when the cell voltage step-down.When battery during to load discharge, its voltage also reduces gradually with discharge process, reduces to put when cell voltage and detects voltage when following, and its capacity is given out light fully, if battery continues discharge, then can cause the permanent damage of battery.So be lower than and put when detecting voltage when the integrated IC of battery protection detects cell voltage, its DSG pin transfers high voltage to by low-voltage, cuts off discharge loop thereby make field-effect transistor Q1 be transferred to turn-offing by conducting, plays the effect of protection battery.
(4) overcurrent protection and short-circuit protection: overcurrent protection is the discharge that stops when high-current consumption load, and the purpose of this function is to protect battery and field effect transistor M OSFET, guarantees the fail safe under battery in working order.When the regular picture process; electric current can produce pressure drop through field-effect transistor Q1, Q2 at its two ends because of conduction impedance; this moment is if load increases because of certain reason causes making unusually loop current; when the electric current surge makes that voltage also is increased to the magnitude of voltage of the integrated IC decision of battery protection; thereby the DSG pin of the integrated IC of battery protection transfers high voltage to by low-voltage rapidly makes field-effect transistor Q1 turn-off cut-out discharge loop, loop current vanishing.In like manner; loop current surge when load short circuits; and voltage is when being increased to the magnitude of voltage of the integrated IC of battery protection decision, and field-effect transistor Q1 can transfer shutoff to by conducting, avoids the permanent damage to integrated IC of battery protection in the circuit and field effect transistor M OSFET.
This battery protecting circuit exports/and when going into terminal shortcircuit, cause the DSG pin of the integrated IC of battery protection to uprise voltage field-effect transistor Q1 is turn-offed, circuit can not be again to battery charging and discharging; Export/go into to hold no longer short circuit after, this protective circuit can't detect, can not initiatively make the Q1 conducting, and needs manual reset or power-off restarting to make the integrated IC of the battery protection conducting Q1 that reworks.
The utility model content
The utility model technical issues that need to address are, how make it can also Intelligent Measurement short circuit recovery situation on the basis of the short circuit breaking circuit of current battery protective circuit, and according to the load automatic turn-on power circuit of situation of short circuit no longer.
The above-mentioned technical problem of the utility model solves like this, a kind of DC power supply load short circuits self-repairing circuit is provided, comprise over-current detection unit, control unit that is electrically connected successively and the controlled switch that connects positive source and load corresponding end, it is characterized in that, the resistance and the capacitor C 4 that also comprise series connection, the one end is connected with positive source by described resistance, and the other end is connected with load by described capacitor C 4; The described capacitor C 4 corresponding other ends that are connected an end with load are connected with described control unit.
According to the self-repairing circuit that the utility model provides, described controlled switch includes, but are not limited to field-effect transistor and relay switch.
According to the self-repairing circuit that the utility model provides, described resistance comprises but does not limit combined resistance R4 and R5.
The self-repairing circuit that provides according to the utility model; this self-repairing circuit is the part of battery protecting plate/battery protecting circuit; this battery protecting plate/battery protecting circuit comprises the integrated IC of battery protection; described controlled switch is the field-effect transistor Q1 and the Q2 of series connection; described control unit and over-current detection unit are built among the integrated IC of described battery protection; the controlled end of field-effect transistor Q1 is connected with the integrated IC of described battery protection, also comprises:
Diode D2, this diode D2 is in parallel with described resistance, and its anode connects positive source;
Field-effect transistor Q3, the controlled end of field-effect transistor Q2 is connected with the integrated IC of described battery protection by field-effect transistor Q3, and field-effect transistor Q3 is connected with positive source;
Field-effect transistor Q4, an end are connected between field-effect transistor Q1 and the Q2, and the other end connects the described capacitor C 4 corresponding other ends that are connected an end with load by resistance R 7, and its controlled end is connected with the integrated IC of described battery protection by resistance R 8.
According to the self-repairing circuit that the utility model provides, this self-repairing circuit can be applicable to the scope that includes, but are not limited to battery protecting circuit.
The DC power supply load short circuits self-repairing circuit that the utility model provides, the transient voltage higher than its charging voltage power supply at one end exported in the action that utilizes the electric capacity electrical characteristic to detect the artificial removal or the load short circuits that disappears automatically, and then drive the control unit control switch and become conducting by shutoff, realize that the power circuit short band carries self-starting; This circuit can extensively utilize on battery protecting plate and other Related products.
Description of drawings
Further the utility model is elaborated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the principle schematic of at present common battery protecting circuit.
Fig. 2 is the theory diagram of the DC power supply load short circuits self-repairing circuit that provides of the utility model.
Fig. 3 is the battery protecting circuit principle schematic corresponding with Fig. 1.
Embodiment
At first, basis of the present utility model is described: DC power supply load short circuits self-repairing circuit, its concrete structure such as Fig. 2 comprise power supply 1, control unit 2, over-current detection unit 3 and load 4, also comprise capacitor C 4 and resistance R 4 and R5, its operating state is as follows:
(1) field-effect transistor Q1 normally, capacitor C 4 both end voltage basically identicals, capacitor C 4 is not charged.
(2) load short circuits, over-current detection unit 3 detect the excessive signal that passes on of electric current and give control unit 2, and control unit 2 is according to turn-offing this signal field effect transistor Q1; At this moment, capacitor C 4 one ends still are connected with power supply, and the other end equivalence ground connection corresponding with power supply output, capacitor C 4 chargings.
(3) remove short circuit, capacitor C 4 discharges produce instantaneous pressure, and control unit 2 recovers conducting field-effect transistor Q1 according to this instantaneous pressure signal, and circuit is resumed work.
Further; illustrate that the utility model tool short circuit band carries the battery protecting plate/battery protecting circuit of self-starting; structure as shown in Figure 3; this circuit is on the basis of common battery protecting circuit; also comprise diode D2, resistance R 4, resistance R 5, capacitor C 4 and field-effect transistor Q3, Q4 and resistance R 7, R8; in this embodiment, the integrated IC of its battery protection can adopt the like product of different company.
(1) annexation of this part newly-increased circuit is as follows: an end of the connection resistance R 4 of diode D2 negative pole; one end of capacitor C 3; one end of the positive pole of diode D2 and resistance R 5; one end of capacitor C 4 and an end of resistance R 7 are connected; the other end of resistance R 4 is connected with the other end of resistance R 5; the other end of capacitor C 4 and input BATTERY+; the other end of capacitor C 3; one end of the source electrode of field-effect transistor Q2 and resistance R 6 is connected; the CSH pin of the other end of resistance R 7 and the integrated IC of battery protection; the source electrode of field-effect transistor Q4 is connected; the source electrode of the drain electrode of field-effect transistor Q4 and field-effect transistor Q1; the drain electrode of Q2 is connected; the grid of field-effect transistor Q4 is connected with an end of resistance R 8, and the other end of resistance R 8 connects the DSG pin of the integrated IC of battery protection; the grid of field-effect transistor Q1.
(2) the utility model battery protecting plate/battery protecting circuit short circuit band carries the basic functional principle of startup: battery protecting plate is when operate as normal, and the CHG of the integrated IC of battery protection, DSG pin are low-voltage, field-effect transistor Q1, Q2, Q3 conducting; When export/go into to hold BATTERY+ and output/go into to hold between the BATTERY-during short circuit; the loop current surge makes the DSG pin of the integrated IC of battery protection transfer high voltage to by low-voltage rapidly; thereby thereby field-effect transistor Q1 turn-offs cut-out discharge loop, loop current vanishing.This moment, field-effect transistor Q4 grid was a high level, and field-effect transistor Q4 turn-offs, and capacitor C 4 is recharged by resistance R 4, R5, and the pin that capacitor C 4 is electrically connected with diode D2, its voltage promote and be cell voltage; In the moment of removing the short circuit action; the pin that capacitor C 4 is electrically connected with diode D2; its voltage was promoted to greater than cell voltage in moment; cause diode D2 conducting; thereby the integrated IC of battery protection is moved again; battery protecting circuit recovers operate as normal, thereby has realized that short circuit later can be voluntarily with carrying the function that starts.

Claims (5)

1, a kind of DC power supply load short circuits self-repairing circuit, comprise over-current detection unit (3), control unit (2) that is electrically connected successively and the controlled switch (5) that connects power supply (1) positive pole and load (4) corresponding end, it is characterized in that, the resistance and the capacitor C 4 that also comprise series connection, the one end is connected with positive source by described resistance, and the other end is connected with load by described capacitor C 4; The described capacitor C 4 corresponding other ends that are connected an end with load are connected with described control unit.
According to the described self-repairing circuit of claim 1, it is characterized in that 2, described controlled switch is field-effect transistor Q1.
According to the described self-repairing circuit of claim 1, it is characterized in that 3, described controlled switch is a relay switch.
According to the described self-repairing circuit of claim 1, it is characterized in that 4, described resistance is combined resistance R4 and R5.
5, according to the described self-repairing circuit of claim 1; it is characterized in that; this self-repairing circuit is the part of battery protecting plate/battery protecting circuit; this battery protecting plate/battery protecting circuit comprises the integrated IC of battery protection; described controlled switch is the field-effect transistor Q1 and the Q2 of series connection; described control unit and over-current detection unit are built among the integrated IC of described battery protection, and the controlled end of field-effect transistor Q1 is connected with the integrated IC of described battery protection, also comprises:
Diode D2, this diode D2 is in parallel with described resistance, and its anode connects positive source;
Field-effect transistor Q3, the controlled end of field-effect transistor Q2 is connected with the integrated IC of described battery protection by field-effect transistor Q3, and field-effect transistor Q3 is connected with positive source;
Field-effect transistor Q4, an end are connected between field-effect transistor Q1 and the Q2, and the other end connects the described capacitor C 4 corresponding other ends that are connected an end with load by resistance R 7, and its controlled end is connected with the integrated IC of described battery protection by resistance R 8.
CN 200520065713 2005-10-13 2005-10-13 DC power supply load short-circuit self-restoring circuit CN2840439Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN 200520065713 CN2840439Y (en) 2005-10-13 2005-10-13 DC power supply load short-circuit self-restoring circuit

Publications (1)

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CN2840439Y true CN2840439Y (en) 2006-11-22

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101924363A (en) * 2010-08-31 2010-12-22 深圳拓邦股份有限公司 Protection circuit for preventing misoperations and solar power generation system applying same
CN101944715A (en) * 2010-08-31 2011-01-12 深圳拓邦股份有限公司 Load short-circuit protection circuit
CN101986492A (en) * 2010-11-08 2011-03-16 中兴通讯股份有限公司 Short-circuit protection circuit and short-circuit protection method
CN102136181A (en) * 2010-01-25 2011-07-27 能美防灾株式会社 Short-circuit isolator
CN102646960A (en) * 2011-02-22 2012-08-22 北京科易动力科技有限公司 Battery pack primary loop interface protection circuit and protection method
CN102790374A (en) * 2011-12-19 2012-11-21 洛阳理工学院 Short circuit protection circuit
CN103022963A (en) * 2012-12-04 2013-04-03 北京经纬恒润科技有限公司 High-end over-current protection circuit
CN103094932A (en) * 2011-10-28 2013-05-08 东莞钜威新能源有限公司 Power supply system and power protection circuit thereof
WO2020142869A1 (en) * 2019-01-07 2020-07-16 深圳市大疆创新科技有限公司 Power supply control circuit, power supply system, and movable platform

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8675324B2 (en) 2010-01-25 2014-03-18 Nohmi Bosai Ltd. Short-circuit isolator
CN102136181A (en) * 2010-01-25 2011-07-27 能美防灾株式会社 Short-circuit isolator
CN102136181B (en) * 2010-01-25 2013-12-04 能美防灾株式会社 Short-circuit isolator
CN101944715B (en) * 2010-08-31 2013-01-30 深圳拓邦股份有限公司 Load short-circuit protection circuit
CN101944715A (en) * 2010-08-31 2011-01-12 深圳拓邦股份有限公司 Load short-circuit protection circuit
CN101924363B (en) * 2010-08-31 2013-04-10 深圳拓邦股份有限公司 Protection circuit for preventing misoperations and solar power generation system applying same
CN101924363A (en) * 2010-08-31 2010-12-22 深圳拓邦股份有限公司 Protection circuit for preventing misoperations and solar power generation system applying same
CN101986492B (en) * 2010-11-08 2015-01-28 中兴通讯股份有限公司 Short-circuit protection circuit and short-circuit protection method
CN101986492A (en) * 2010-11-08 2011-03-16 中兴通讯股份有限公司 Short-circuit protection circuit and short-circuit protection method
CN102646960B (en) * 2011-02-22 2016-10-05 北京科易动力科技有限公司 A kind of battery major loop interface protection circuit and guard method
CN102646960A (en) * 2011-02-22 2012-08-22 北京科易动力科技有限公司 Battery pack primary loop interface protection circuit and protection method
CN103094932B (en) * 2011-10-28 2015-10-21 东莞钜威新能源有限公司 A kind of electric power system and power protecting circuit thereof
CN103094932A (en) * 2011-10-28 2013-05-08 东莞钜威新能源有限公司 Power supply system and power protection circuit thereof
CN102790374A (en) * 2011-12-19 2012-11-21 洛阳理工学院 Short circuit protection circuit
CN103022963B (en) * 2012-12-04 2015-01-21 北京经纬恒润科技有限公司 High-end over-current protection circuit
CN103022963A (en) * 2012-12-04 2013-04-03 北京经纬恒润科技有限公司 High-end over-current protection circuit
WO2020142869A1 (en) * 2019-01-07 2020-07-16 深圳市大疆创新科技有限公司 Power supply control circuit, power supply system, and movable platform

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C14 Grant of patent or utility model
GR01 Patent grant
C53 Correction of patent for invention or patent application
CB03 Change of inventor or designer information

Designer after: Chen Zhiwen

Designer after: Liu Zenghong

Designer before: Lin Lemin

Designer before: Liu Zenghong

COR Change of bibliographic data

Free format text: CORRECT: DESIGNER; FROM: LIN YUEMIN; LIU ZENGHONG TO: CHEN ZHIWEN; LIU ZENGHONG

ASS Succession or assignment of patent right

Owner name: SHENZHEN SENDA INTERNATIONAL ELECTRONIC DEVICES CO

Free format text: FORMER OWNER: SANDA BAILI ELECTRIC APPLIANCE CO., LTD., SHENZHEN

Effective date: 20090605

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Effective date of registration: 20090605

Address after: Building 5 and 6, Arts crafts emporium, SED technology, Nanshan District Science Park, Guangdong, Shenzhen province 518057

Patentee after: Shenzhen Sed-Ipd International Electronic Device Co., Ltd.

Address before: Floor 6,, SED technology Arts crafts emporium, Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen 518057

Patentee before: Shenzhen SED Baili Electronics Co., Ltd.

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Free format text: CORRECT: ADDRESS; FROM: 518057 5/F+6/F, SANGDA SCIENCE AND TECHNOLOGY INDUSTRY BUILDING, SCIENCE AND TECHNOLOGY PARK, NANSHAN DISTRICT, SHENZHEN CITY, GUANGDONG PROVINCE TO: 518057 6/F, SANGDA SCIENCE AND TECHNOLOGY INDUSTRY BUILDING, SCIENCE AND TECHNOLOGY INDUSTRIAL PARK, NANSHAN DISTRICT, SHENZHEN CITY

C41 Transfer of patent application or patent right or utility model
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Effective date of registration: 20100428

Address after: 518057, Shenzhen Nanshan District science and Technology Industrial Park, SED technology Arts crafts emporium 6 floor

Patentee after: Shenzhen SED Baili Electronics Co., Ltd.

Address before: 518057 Nanshan District science and Technology Park, Guangdong SED science and technology Arts crafts emporium,, building 5, 6

Patentee before: Shenzhen Sed-Ipd International Electronic Device Co., Ltd.

ASS Succession or assignment of patent right

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CF01 Termination of patent right due to non-payment of annual fee

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