CN109524945A - A kind of protection circuit and its control method and power-supply system - Google Patents
A kind of protection circuit and its control method and power-supply system Download PDFInfo
- Publication number
- CN109524945A CN109524945A CN201710848236.4A CN201710848236A CN109524945A CN 109524945 A CN109524945 A CN 109524945A CN 201710848236 A CN201710848236 A CN 201710848236A CN 109524945 A CN109524945 A CN 109524945A
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- CN
- China
- Prior art keywords
- circuit
- power
- switch
- supply system
- protection circuit
- 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.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/025—Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides a kind of protection circuit and its control method and power-supply system, the protection circuit is series in the circuit of power-supply system, comprising: first switch and the auxiliary circuit in parallel with the first switch；The first switch and the auxiliary circuit are series in the circuit of the power-supply system；Wherein, the auxiliary circuit includes the second switch and variable resistance being connected in series, and the second switch is used to control the on-off of the auxiliary circuit, and the variable resistance is used to adjust the electric current in the auxiliary circuit.In protection circuit provided by the invention and its control method and power-supply system; variable resistance is combined by two switches; the on-off of co- controlling power-supply system; power-supply system is set just not disconnect circuit quickly when encountering failure; but it is disconnected with being gradually reduced for electric current; caused load dump problem, ensure that the reliability of power-supply system and load when to effectively avoid by power system failure.
Description
Technical field
The present invention relates to field of power supplies, in particular to a kind of protection circuit and its control method and power-supply system.
Background technique
Power supply disconnects, to protect battery core suddenly during charging and discharging when encountering abnormal conditions and will lead to circuit.
But if the direct disconnecting circuit in high current charge-discharge, it is easy to cause serious load dump (load dump) problem, from
And high-voltage safety problem is brought, and associated appliance element may be damaged.
Therefore, it is great to power off harm suddenly for power circuit, needs to take steps to avoid this problem to occur, enhances power supply
The safety of system and associated appliance element.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of protection circuit and its control method and power-supply system, with solution
Certainly the problem of power-supply system load dump.
In order to solve the above technical problems, one aspect of the present invention provides a kind of protection circuit, the protection circuit is series at electricity
In the circuit of source system, the protection circuit includes: first switch and the auxiliary circuit in parallel with the first switch；
The first switch and the auxiliary circuit are series in the circuit of the power-supply system；
Wherein, the auxiliary circuit includes the second switch and variable resistance being connected in series, and the second switch is for controlling
The on-off of the auxiliary circuit is made, the variable resistance is used to adjust the electric current in the auxiliary circuit.
Optionally, the first switch is relay or power switch tube.
Optionally, the second switch is relay or power switch tube.
Optionally, the variable resistance is thermistor or varistor or photo resistance.
Optionally, the thermistor is PTC thermistor.
Optionally, the protection circuit further include: protective tube, the first switch and the auxiliary circuit with the guarantor
Dangerous pipe is connected in series.
To solve the above-mentioned problems, another aspect of the present invention provides a kind of control method such as above-mentioned protection circuit, comprising:
When the power-supply system works normally, the first switch closure, the second switch is disconnected；
When the power-supply system occurs abnormal, the second switch closure, then the first switch is disconnected；When described
When electric current is lower than preset threshold in auxiliary circuit, the second switch is disconnected.
Optionally, the first switch is controlled using battery management system and the second switch is opened or closed.
Optionally, the power-supply system includes battery core, and the power-supply system occurs abnormal including: battery core overcharge and battery core
Overdischarge.
To solve the above-mentioned problems, the present invention also provides a kind of power-supply systems, comprising: protects circuit, electricity as described above
Core and battery management system；
The battery core is connected with the protection circuit, the battery core and the protection circuit with the battery management system
Connection；
The battery management system monitors the physical parameter of the battery core, and by protecting described in the control of physical parameter
The closed state of circuit.
Optionally, the power-supply system further includes circuit supervision system, the battery core by the circuit supervision system with
The battery management system connection, the circuit supervision system and the protection circuit connection.
Optionally, the battery core is 48V battery core or 36V battery core.
It optionally, further include a positive terminal and a negative pole end, it is the positive terminal, the protection circuit, the battery core, described
Negative pole end is sequentially connected in series.
In protection circuit provided by the invention and its control method and power-supply system, being combined by two switches can power transformation
Resistance, the on-off of co- controlling power-supply system make power-supply system just not disconnect circuit quickly when encountering failure, but with electricity
Stream is gradually reduced and disconnects, so that caused load dump problem when effectively avoiding by power system failure, ensure that
The reliability of power-supply system and load.Further, which can be used for vehicle power supply, and the program is simple and effective, at
This is low, convenient for being widely used to promote.
Detailed description of the invention
Fig. 1 is the schematic diagram of power-supply system in one embodiment of the invention；
Fig. 2 is the work flow diagram that circuit is protected in one embodiment of the invention；
In figure: 10- battery core；20- protects circuit；21- first switch；22- second switch；23- variable resistance；24- insurance
Pipe；30- terminals；31- positive terminal；32- negative pole end；40- circuit supervision system；50- battery management system.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to protection circuit proposed by the present invention and its control method and power-supply system
It is described in further detail.According to claims and following explanation, advantages and features of the invention will be become apparent from.It should be noted
It is that attached drawing is all made of very simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating this hair
The purpose of bright embodiment.
Refering to fig. 1, it illustrates a kind of schematic diagram of feasible power-supply system of the present embodiment, which can be used for vehicle
It carries power supply to use, including the battery core 10 of a 48V, certainly, the voltage of battery core 10 is not limited to 48V, and those skilled in the art can
It is arranged according to specific requirements, such as: 36V, 12V etc..Power-supply system has terminals 30, including positive terminal 31 and negative pole end 32,
The connection load powering load of terminals 30, terminals 30 are also used to the input terminal of the charging of battery core 10, positive terminal 31 and battery core
10 anode connection, negative pole end 32 are connect with the cathode of battery core 10.Battery core 10 is composed in series by the sub- battery core of 12 4V.In anode
It is in series with a protection circuit 20 between end 31 and the anode of battery core 10, mainly for the protection of battery core 10 and load, in power-supply system
The on-off of power-supply system is controlled when failure.
The internal feature of lower mask body introduction protection circuit 20.
Protection circuit 20 is series in the circuit of power-supply system, comprising: first switch 21 and auxiliary circuit, first switch 21
It is series in the circuit of power-supply system again with after auxiliary circuit parallel connection；Wherein, the auxiliary circuit includes: second switch 22, is used
In the on-off for controlling the auxiliary circuit；Variable resistance 23, for controlling the electric current in the auxiliary circuit；22 He of second switch
Variable resistance 23 is connected.
Specifically, variable resistance 23 can be thermistor or varistor or photo resistance, preferably, thermistor is
PTC thermistor.After having electric current in auxiliary circuit, variable resistance 23 can slowly generate heat, its resistance value is caused to increase, auxiliary circuit electricity
Stream is gradually reduced, and when electric current is less than preset threshold in auxiliary circuit, second switch 22 is disconnected, so that power-supply system is encountering event
When barrier, do not disconnect not instead of directly, have one slowly reduce electric current process, so will not occur load dump phenomenon and
High-voltage safety problem, to protect the associated appliance element in load.
Specifically, relay or power switch tube can be selected in first switch 21 and second switch 22.By taking relay as an example,
First switch 21 and second switch 22 are respectively the first relay and the second relay, using the control of battery management system 50 the
One relay and the second relay disconnect and closure.Battery management system 50 detects that the electric current in auxiliary circuit is less than default threshold
When value, the second relay of control is disconnected, and realizes that entire power-supply system is fully disconnected.
Preferably, the protection circuit can also further comprise protective tube 24, protective tube 24 is series at the circuit of power-supply system
In, and connect with first switch 21.
Below with reference to the control method of Fig. 2 introduction protection circuit, when power-supply system works normally, first switch 21 is in
Closed state, second switch 22 are in an off state, and electric current passes through from first switch 21.When power-supply system occurs abnormal, example
Such as: there is overcharging or overdischarging phenomenon in the battery core 10 of power supply, and the circuit of power-supply system is disconnected to protect battery core 10.Power-supply system
Control method when occurring abnormal includes: first closure second switch 22, is then turned off first switch 21 so that in power-supply system according to
So there is electric current, from without load dump phenomenon.When having electric current to pass through in auxiliary circuit, thermistor generates heat and makes certainly
The resistance value of body becomes larger, and is gradually reduced so as to cause electric current in auxiliary circuit, when electric current is less than preset threshold in auxiliary circuit
When, control second switch 22 disconnects, so that entire power-supply system is in an off state.
In conjunction with above-mentioned protection circuit, the present embodiment introduces a kind of power-supply system again, and applies above-mentioned protection circuit.Power supply system
System specifically includes that battery core 10, protection circuit 20, terminals 30, (CSC, the Circuit Supervision of circuit supervision system 40
) and battery management system 50 (BMS, battery management system) Control；Wherein, terminals 30 include anode
31, negative pole end 32 are held, positive terminal 31 connects the anode of battery core 10, and negative pole end 32 connects the cathode of battery core 10.
Battery core 10 is connected with protection circuit 20, and battery core 10 and protection circuit 20 are connect with battery management system 50；Wherein,
Battery core 10 is connect by circuit supervision system 40 with battery management system 50, and circuit supervision system 40 is connect with protection circuit 20.
Battery management system 50 monitors the physical parameter (including: current parameters, voltage parameter, temperature parameter etc.) of battery core 10, and passes through
The closed state of circuit is protected described in the control of physical parameter.The physical parameter of battery core 10 can be by being set to battery management system
Current sensor, voltage sensor, temperature sensor in system 50 etc. obtain.
Battery management system 50 can directly control first switch 21 and second switch 22 in protection circuit 20 and disconnect and be closed.
Those skilled in the art can also control the working time of auxiliary circuit according to design requirement, for example, the size of control preset threshold.
The biggish thermistor of temperature coefficient can be selected in order to which the speed for reducing its electric current is accelerated for thermistor, so that auxiliary
The working time of circuit reduces.When system breaks down, if the time that power-supply system is fully disconnected is too slow, damage may result in
The phenomenon that hurting battery core or load, so those skilled in the art can pass through the type selecting of thermistor and setting for battery management system 50
Surely the reaction time of auxiliary circuit is controlled.
Wherein, battery core 10 can be 48V battery core or 36V battery core.The power-supply system can be used for vehicle power supply.Currently, vehicle is taken
It carries the weak mixing system of 48V and is increasingly becoming technological trend, this mainly has benefited from the good fuel-economizing cost performance power-supply system of 48V system
It can further improve the performance of the weak mixing system of vehicle loading 48V.
In conclusion being opened in protection circuit provided herein and its control method and power-supply system by two
It closes and combines variable resistance, the on-off of co- controlling power-supply system disconnect power-supply system will not just quickly when encountering failure
Circuit, but disconnected with being gradually reduced for electric current, so that caused load is prominent when effectively avoiding by power system failure
Drop problem ensure that the reliability of power-supply system and load.Further, which can be used for vehicle power supply, and the party
Case is simple and effective, at low cost, convenient for being widely used to promote.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For system disclosed in embodiment
For, due to corresponding to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (13)
1. a kind of protection circuit, the protection circuit is series in the circuit of power-supply system, which is characterized in that the protection circuit
It include: first switch and the auxiliary circuit in parallel with the first switch；
The first switch and the auxiliary circuit are series in the circuit of the power-supply system；
Wherein, the auxiliary circuit includes the second switch and variable resistance being connected in series, and the second switch is for controlling institute
The on-off of auxiliary circuit is stated, the variable resistance is used to adjust the electric current in the auxiliary circuit.
2. protection circuit as described in claim 1, which is characterized in that the first switch is relay or power switch tube.
3. protection circuit as described in claim 1, which is characterized in that the second switch is relay or power switch tube.
4. protection circuit as described in claim 1, which is characterized in that the variable resistance be thermistor or varistor or
Photo resistance.
5. protection circuit as claimed in claim 4, which is characterized in that the thermistor is PTC thermistor.
6. protection circuit as described in claim 1, which is characterized in that further include: protective tube, the first switch and described auxiliary
Circuit is helped to be connected in series with the protective tube.
7. a kind of control method for protecting circuit as described in claim 1~6 any one characterized by comprising
When the power-supply system works normally, the first switch closure, the second switch is disconnected；
When the power-supply system occurs abnormal, the second switch closure, then the first switch is disconnected；When the auxiliary
When electric current is lower than preset threshold in circuit, the second switch is disconnected.
8. the control method of protection circuit as claimed in claim 7, which is characterized in that using described in battery management system control
First switch and the second switch are opened or closed.
9. the control method of protection circuit as claimed in claim 7, which is characterized in that the power-supply system includes battery core, institute
Power-supply system is stated to occur abnormal including: battery core overcharge and battery core overdischarge.
10. a kind of power-supply system characterized by comprising as described in claim 1~6 any one protect circuit, battery core and
Battery management system；
The battery core is connected with the protection circuit, and the battery core and the protection circuit connect with the battery management system
It connects；
The battery management system monitors the physical parameter of the battery core, and by protecting circuit described in the control of physical parameter
Closed state.
11. power-supply system as claimed in claim 10, which is characterized in that further include circuit supervision system, the battery core passes through
The circuit supervision system is connect with the battery management system, the circuit supervision system and the protection circuit connection.
12. power-supply system as described in claim 10 or 11, which is characterized in that the battery core is 48V battery core or 36V battery core.
13. power-supply system as described in claim 10 or 11, which is characterized in that further include a positive terminal and a negative pole end, institute
Positive terminal, the protection circuit, the battery core, the negative pole end is stated to be sequentially connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710848236.4A CN109524945A (en) | 2017-09-19 | 2017-09-19 | A kind of protection circuit and its control method and power-supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710848236.4A CN109524945A (en) | 2017-09-19 | 2017-09-19 | A kind of protection circuit and its control method and power-supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109524945A true CN109524945A (en) | 2019-03-26 |
Family
ID=65769440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710848236.4A Pending CN109524945A (en) | 2017-09-19 | 2017-09-19 | A kind of protection circuit and its control method and power-supply system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103597688A (en) * | 2011-08-04 | 2014-02-19 | 株式会社Lg化学 | Over-current protection device of secondary battery, protection method thereof, and battery pack thereof |
| CN104037460A (en) * | 2013-03-07 | 2014-09-10 | 三星Sdi株式会社 | Battery management system and switching method thereof |
| JP2015061504A (en) * | 2013-09-20 | 2015-03-30 | トヨタ自動車株式会社 | Power storage system |
| CN104802655A (en) * | 2014-01-24 | 2015-07-29 | 联合汽车电子有限公司 | Open circuit diagnosis system of high-voltage direct current end of electric driving system of electric automobile |
| CN105703439A (en) * | 2016-03-28 | 2016-06-22 | 李志刚 | Power module management system and method for lithium batteries |
| CN106314189A (en) * | 2016-09-23 | 2017-01-11 | 北京新能源汽车股份有限公司 | Charge-discharge circuit and automobile |
| CN206211522U (en) * | 2016-12-05 | 2017-05-31 | 重庆华数机器人有限公司 | A kind of PTC resistor suppresses the circuit of surge current |
-
2017
- 2017-09-19 CN CN201710848236.4A patent/CN109524945A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103597688A (en) * | 2011-08-04 | 2014-02-19 | 株式会社Lg化学 | Over-current protection device of secondary battery, protection method thereof, and battery pack thereof |
| CN104037460A (en) * | 2013-03-07 | 2014-09-10 | 三星Sdi株式会社 | Battery management system and switching method thereof |
| JP2015061504A (en) * | 2013-09-20 | 2015-03-30 | トヨタ自動車株式会社 | Power storage system |
| CN104802655A (en) * | 2014-01-24 | 2015-07-29 | 联合汽车电子有限公司 | Open circuit diagnosis system of high-voltage direct current end of electric driving system of electric automobile |
| CN105703439A (en) * | 2016-03-28 | 2016-06-22 | 李志刚 | Power module management system and method for lithium batteries |
| CN106314189A (en) * | 2016-09-23 | 2017-01-11 | 北京新能源汽车股份有限公司 | Charge-discharge circuit and automobile |
| CN206211522U (en) * | 2016-12-05 | 2017-05-31 | 重庆华数机器人有限公司 | A kind of PTC resistor suppresses the circuit of surge current |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190326 |
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| RJ01 | Rejection of invention patent application after publication |