CN206742925U - A kind of batter-charghing system and its output overvoltage protection circuit - Google Patents
A kind of batter-charghing system and its output overvoltage protection circuit Download PDFInfo
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- CN206742925U CN206742925U CN201621334507.1U CN201621334507U CN206742925U CN 206742925 U CN206742925 U CN 206742925U CN 201621334507 U CN201621334507 U CN 201621334507U CN 206742925 U CN206742925 U CN 206742925U
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Abstract
The utility model discloses a kind of batter-charghing system and its output overvoltage protection circuit, belong to power technique fields.The protection circuit includes the first diode, the second diode, switching tube and detection control unit, wherein：The anode of the anode of first diode and the second diode connects two secondary output ends of the high frequency transformer of output circuit respectively, the drain electrode of the negative electrode of the first diode and the second diode connecting valve pipe together；The source electrode connecting node of switching tube, the drive end of the grid connecting detection control unit of switching tube；The output end of the high-frequency rectification bridge of the test side connection output circuit of detection control unit, ground terminal connecting node, for detecting the output voltage of batter-charghing system, and when detecting that output voltage is higher than default threshold value, the conducting of driving switch pipe.The utility model, which dexterously combines existing output circuit, realizes the second protection of battery pack charging overvoltage, and topological structure is simplified, and small volume, cost are low, versatile.
Description
Technical field
It the utility model is related to power technique fields, more particularly to a kind of batter-charghing system and its output over-voltage protection electricity
Road.
Background technology
At present, as 13 Planning Support emerging strategic industries develop, national standard《The electronic vapour of GB-T27930-2015
Communication protocol between the vehicle-mounted conduction-type charger of Chefei and battery management system》Issue is implemented, electric automobile and its charging pile
Industry flourishes.Wherein, charging technique is one of key technology of Development of Electric Vehicles.It is that AC network alternating current is first
Direct current is rectified into, then by links such as high frequency transformer isolated variable, filtering high-frequency rectifiers, is converted into battery pack charging institute
The direct current output needed.It is that a kind of active load (is both one to load again because the load of charging system for electric automobile is battery pack
It is a power supply), charging system should realize that adjustable constant-flow exports, and can limit highest charging output voltage again；Excessively stream and
Overvoltage can all damage battery pack.
Generally, charging system for electric automobile all has the feedback function of limitation maximum charging voltage.If however,
Feedback circuit fail, then export charging voltage will (especially in wireless charging system) out of control, neither one redundancy it is defeated
Go out overvoltage crowbar, second protection is carried out to battery pack, the lighter damages battery management system, severe one damage battery pack.
Therefore, how effectively and reliably to realize that the second protection of charging overvoltage is a urgent problem to be solved.
The content of the invention
In view of this, the purpose of this utility model is to provide a kind of batter-charghing system and its output over-voltage protection electricity
Road, effectively and reliably to realize the second protection of battery pack charging overvoltage.
Technical scheme is as follows used by the utility model solves above-mentioned technical problem：
According to one side of the present utility model, there is provided a kind of output overvoltage protection circuit, applied to battery Charging
System, the batter-charghing system include output circuit.The protection circuit includes the first diode D5, the second diode D6, switching tube
VQ and detection control unit, wherein：
First diode D5 anode and the second diode D6 anode connect the high frequency transformer of output circuit respectively
Two secondary output ends, the first diode D5 and the second diode D6 negative electrode connecting valve pipe VQ together drain electrode；Switching tube
VQ source electrode connecting node, the drive end of switching tube VQ grid connecting detection control unit；The detection of detection control unit
The output end of the high-frequency rectification bridge of end connection output circuit, ground terminal connecting node, for detecting the output of batter-charghing system
Voltage, and when detecting that output voltage is higher than default threshold value, driving switch pipe VQ conductings.
According to other side of the present utility model, there is provided a kind of batter-charghing system, the system includes output circuit,
Also include the output overvoltage protection circuit of above-mentioned technical proposal.
Preferably, output circuit includes high frequency transformer Tr, high-frequency rectification bridge 2 and output filter network 3, wherein：
High frequency transformer Tr two secondary output ends connect two ac input ends of high-frequency rectification bridge 2, high frequency respectively
The positive input terminal of the cathode output end connection output filter network 3 of rectifier bridge 2, the cathode output end connection of high-frequency rectification bridge 2 are defeated
Go out the negative input end of filter network 3, and as node；The positive-negative output end of output filter network 3 connects battery pack respectively
Positive pole and negative pole.
In the utility model embodiment, when detection control unit detects that the output voltage of batter-charghing system output is higher than
During default threshold value, driving switch pipe VQ is turned it on.High frequency transformer Tr secondary output end by diode D5 or D6, open
Two diodes D2 and D4 for closing the earth terminal of pipe VQ and high-frequency rectification bridge 2 are short-circuited；And the connecting node of high-frequency rectification bridge 2
Vo two diodes D1 and D3 prevent output to be short-circuited.Once high frequency transformer Tr secondary is short-circuited, the high frequency of prime
The short-circuit protection function of translation circuit can be acted immediately, and whole circuit is protected and is stopped, it is achieved thereby that to defeated
Go out overvoltage protection.The utility model dexterously combines the function of available circuit, and topological structure is simplified, and defencive function reliably has
Effect, small volume, cost are low, versatile.
Brief description of the drawings
Fig. 1 is a kind of structure chart for output overvoltage protection circuit that the utility model embodiment provides.
Fig. 2 is a kind of structure chart for batter-charghing system that the utility model embodiment provides.
In figure, D1-D6 represents diode, and VQ represents switching tube, and 101 represent detection control unit；Tr represents high frequency transformation
Device, 1 represents overvoltage crowbar, and 2 represent high-frequency rectification bridge, and 3 represent output filter network, and Ed represents battery pack.
Embodiment
In order that technical problem to be solved in the utility model, technical scheme and beneficial effect are clearer, clear, with
Under in conjunction with the accompanying drawings and embodiments, the utility model is further elaborated.It is it should be appreciated that described herein specific real
Example is applied only to explain the utility model, is not used to limit the utility model.
Embodiment one
As shown in figure 1, a kind of output overvoltage protection circuit that the utility model embodiment provides, applied to battery Charging
System, the protection circuit include the first diode D5, the second diode D6, switching tube VQ and detection control unit 101, wherein：
First diode D5 anode and the second diode D6 anode connect the output circuit of batter-charghing system respectively
Two secondary output ends, the first diode D5 and the second diode D6 negative electrode connecting valve pipe VQ together drain electrode；Switch
Pipe VQ source electrode connecting node, the drive end of switching tube VQ grid connecting detection control unit 101；Detection control unit
The output end V of the high-frequency rectification bridge of test side connection output circuitO, ground terminal connecting node, for detecting batter-charghing system
Output voltage, and when detecting that output voltage is higher than, driving switch pipe VQ conductings.
When detection control unit 101 detects that the output voltage (i.e. node Vo voltage) of batter-charghing system output is higher than
During default threshold value, driving switch pipe VQ is turned it on.Two secondary output ends of high frequency transformer pass through the first diode D5
Or the earth terminal of the second diode D6, switching tube VQ and high-frequency rectification bridge is short-circuited；And the output end V of high-frequency rectification bridgeOIt is anti-
Stop output to be short-circuited.Once the secondary of high frequency transformer is short-circuited, the short-circuit protection function of the high frequency conversion circuit of prime is stood
It can act, whole circuit is protected and is stopped, it is achieved thereby that to output over-voltage protection.
Embodiment two
As shown in Fig. 2 a kind of batter-charghing system that the utility model embodiment provides includes output circuit and exported
Voltage protection circuit 1.Wherein, output circuit includes high frequency transformer Tr, high-frequency rectification bridge 2 and output filter network 3.Output overvoltage
Protection circuit 1 includes the first diode D5, the second pole pipe D6, switching tube VQ and detection control unit 101.
In output circuit, an exchange input of high frequency transformer Tr secondary output end c connection high-frequency rectifications bridge 2
End, and as node 1.；Another ac input end of high frequency transformer Tr secondary output end d connection high-frequency rectifications bridge 2, and
As node 2..The positive input terminal of the cathode output end connection output filter network 3 of high-frequency rectification bridge 2, and as node Vo；It is high
The negative input end of the cathode output end connection output filter network 3 of frequency rectifier bridge 2, and as node.Export filter network 3
Positive-negative output end connects battery pack Ed positive pole and negative pole respectively.
Annexation between each unit of overvoltage crowbar 1 and batter-charghing system output circuit is：One or two pole
1., the second diode D6 anode connecting node is 2. for pipe D5 anode connecting node；First diode D5 and the second diode D6
Negative electrode be connected together and reconnect switching tube VQ drain electrode (or making colelctor electrode)；Switching tube VQ source electrode (or making emitter stage)
Connecting node, the drive end of switching tube VQ grid (or making base stage) connecting detection control unit 101；Detection control unit
101 test side connecting node Vo, the ground terminal connecting node of detection control unit 101.
When detection control unit 101 detects that the output voltage (i.e. node Vo voltage) of batter-charghing system output is higher than
During default threshold value, driving switch pipe VQ is turned it on.High frequency transformer Tr secondary output end c and d passes through the first diode
D5 or the second diode D6, two diodes (D2, D4) of earth terminal of switching tube VQ and high-frequency rectification bridge 2 are short-circuited；And
The connecting node Vo of high-frequency rectification bridge 2 two diodes (D1, D3) prevent output to be short-circuited.Once high frequency transformer Tr's
Secondary is short-circuited, and the short-circuit protection function of the high frequency conversion circuit of prime can be acted immediately, and whole circuit is protected and stopped
Only work, it is achieved thereby that to output over-voltage protection.
The utility model dexterously combines the function of available circuit, and topological structure is simplified, and defencive function is reliably effective, body
Product is small, cost is low, versatile.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property includes, so that article or device including a series of elements not only include those key elements, but also including not
There are the other element being expressly recited, or the key element intrinsic also including article or device.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure transformation that bright specification and accompanying drawing content are made, or other related technical areas are directly or indirectly used in,
Similarly it is included within the scope of the present invention.
Claims (3)
1. a kind of output overvoltage protection circuit, applied to batter-charghing system, the batter-charghing system includes output circuit, it is special
Sign is that the protection circuit includes the first diode (D5), the second diode (D6), switching tube (VQ) and detection control unit,
Wherein：
The anode of first diode (D5) and the anode of the second diode (D6) connect the high frequency of the output circuit respectively
The negative electrode of two secondary output ends of transformer, first diode (D5) and second diode (D6) connects institute together
State switching tube (VQ) drain electrode；The source electrode connecting node of the switching tube (VQ), the grid connection institute of the switching tube (VQ)
State the drive end of detection control unit；The test side of the detection control unit connects the high-frequency rectification bridge of the output circuit
Output end, ground terminal connecting node, detect output voltage higher than pre- for detecting the output voltage of batter-charghing system, and working as
If threshold value when, drive the switching tube (VQ) turn on.
2. a kind of batter-charghing system, the system includes output circuit, it is characterised in that the system also includes such as claim 1
Described output overvoltage protection circuit.
3. batter-charghing system according to claim 2, it is characterised in that the output circuit includes high frequency transformer
(Tr), high-frequency rectification bridge (2) and output filter network (3), wherein：
Two secondary output ends of the high frequency transformer (Tr) connect two exchange inputs of the high-frequency rectification bridge (2) respectively
End, the positive input terminal of the cathode output end connection output filter network (3) of the high-frequency rectification bridge (2), the high frequency are whole
The negative input end of the cathode output end connection output filter network (3) of bridge (2) is flowed, and as node；The output filtering net
The positive-negative output end of network (3) connects the positive pole and negative pole of battery pack respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621334507.1U CN206742925U (en) | 2016-12-07 | 2016-12-07 | A kind of batter-charghing system and its output overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621334507.1U CN206742925U (en) | 2016-12-07 | 2016-12-07 | A kind of batter-charghing system and its output overvoltage protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206742925U true CN206742925U (en) | 2017-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621334507.1U Active CN206742925U (en) | 2016-12-07 | 2016-12-07 | A kind of batter-charghing system and its output overvoltage protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020215279A1 (en) * | 2019-04-25 | 2020-10-29 | 深圳欣锐科技股份有限公司 | Over-voltage protection control circuit and related device |
| CN112564298A (en) * | 2020-11-10 | 2021-03-26 | 上海万暨电子科技有限公司 | Circuit protection system and method and LCC type wireless charging system |
-
2016
- 2016-12-07 CN CN201621334507.1U patent/CN206742925U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020215279A1 (en) * | 2019-04-25 | 2020-10-29 | 深圳欣锐科技股份有限公司 | Over-voltage protection control circuit and related device |
| CN112564298A (en) * | 2020-11-10 | 2021-03-26 | 上海万暨电子科技有限公司 | Circuit protection system and method and LCC type wireless charging system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200117 Address after: 118, room 201800, 3 west side, 3131 Jinsha River Road, Shanghai, Jiading District Patentee after: Shanghai Nanxiao Fire Protection Engineering Equipment Co., Ltd. Address before: 1306, 518054, Press Plaza, Shennan Avenue, Futian District, Guangdong, Shenzhen Patentee before: Bianco robot Co Ltd |