CN207381966U - Control box short-circuit protection circuit on charging gun cable - Google Patents
Control box short-circuit protection circuit on charging gun cable Download PDFInfo
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- CN207381966U CN207381966U CN201721396571.7U CN201721396571U CN207381966U CN 207381966 U CN207381966 U CN 207381966U CN 201721396571 U CN201721396571 U CN 201721396571U CN 207381966 U CN207381966 U CN 207381966U
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- triode
- optocoupler
- power supply
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Abstract
The utility model discloses control box short-circuit protection circuits on a kind of charging gun cable; including the firewire and zero curve being arranged side by side; the firewire includes firewire input terminal and fire wire output end; the zero curve includes zero curve input terminal and zero line output end; a relay K1 is respectively equipped on firewire and zero curve; relay K2, and a power supply powered for relay K1 and relay K2 is equipped between firewire and zero curve；Further include controller, accessory power supply, bleeder circuit, operational amplifier, optocoupler, triode Q3 and relay on-off control circuit；The utility model to automobile during the entire process of charging; complete monitoring fire wire output end and zero line output end whether overcurrent or short circuit; if automobile charges normal when no overcurrent or short circuit; once overcurrent or short circuit occur; relay K1 and K2 will be quickly disconnected in the Millisecond time, realizes overcurrent or short-circuit protection.
Description
Technical field
The utility model is related to a kind of a kind of short-circuit protection electricity of control box on protection circuit more particularly to charging gun cable
Road.
Background technology
As the improvement of people's living standards, and environmentally friendly, energy saving, the green ecological earth the trend advocated now, electricity
Electrical automobile is under the support energetically of country, and development is increasingly grown, and application is more and more extensive, the mating charging gun with electric vehicle
Also it is correspondingly fast-developing therewith.
Electric vehicle when charging by charging gun cable realizes and charges that charging gun includes a charging being connected with automobile
Control box and charging plug in pipette tips, cable are equipped with charging circuit on cable in control box, and for circuit, overcurrent can be generally set
Or short-circuit detecting circuit.
There are two types of overcurrents or short-circuit detecting common practice：The first is detected using voltage system, is exactly detection output
Whether the voltage of mouth is zero, it is believed that after short circuit, port voltage is just zero.But when there is very long output line in test point back
Cable and in the far end short of cable, cable just becomes a high power load, and test point voltage can't be zero, differ
Protection is surely realized in time.Second of use current system detects, and is one high-power small resistance value of series connection on zero curve or firewire
Resistance, then go to detect the voltage difference at this resistance both ends with the circuit of the complexity such as amplifier or triode, then by this voltage difference with
Standard comparing, to determine whether that overcurrent or short circuit occur.Although this electric current detecting method avoids the shortcomings that voltage system, but
It is that circuit is complicated, of high cost, isolating, it is necessary to which to be in addition further added by isolation electric for high-pressure side and low-voltage control terminal can not be directly realized by
Overcurrent or short-circuit detecting result are transferred to low-pressure end by road.
The content of the invention
The purpose of this utility model is that providing one kind solves the above problems, during the entire process of charging to automobile,
Complete monitoring output terminal whether overcurrent or short circuit, and control box short-circuit protection electricity on the charging gun cable that circuit is simple, response is fast
Road.
To achieve these goals, the technical solution adopted in the utility model is such：It is controlled on a kind of charging gun cable
Box short-circuit protection circuit, including the firewire and zero curve being arranged side by side, the firewire includes firewire input terminal and fire wire output end,
The zero curve includes zero curve input terminal and zero line output end, a relay K1, relay K2 being respectively equipped on firewire and zero curve, and
A power supply powered for relay K1 and relay K2 is equipped between firewire and zero curve；
Further include controller, accessory power supply, bleeder circuit, operational amplifier, optocoupler, triode Q3 and relay on-off control
Circuit processed；
The controller includes an external port CTR1 end, and the external port is connected with connecing the I/O port of controller, uses
In output low and high level；
The accessory power supply is for one reference voltage of output；
The bleeder circuit includes the R1 and R2 of series connection, and resistance value R1 is more than R2, and wherein R1 is connected with accessory power supply anode,
R2 is connected with accessory power supply cathode, forms closed circuit；
The optocoupler includes anode, cathode, collector and emitter；
The firewire or zero curve are equipped with the cathode that detection resistance RL, RL an input terminal connects optocoupler through resistance R10, output terminal
The anode of optocoupler is connect through resettable fuse RF, the collector of optocoupler connects the anode of accessory power supply, and emitter is divided into two-way, all the way
R5 connects the positive input of operational amplifier, is grounded all the way through R6；The output terminal of the operational amplifier is through diode D6, resistance
Feedback accesses its positive input after R3；
The output terminal of the triode Q3 base stages concatenation operation amplifier, collector connect CTR1 ends through a current-limiting resistance R7,
Emitter is grounded；
The base stage of the relay on-off control circuit input termination triode Q3, output terminal connection relay K1 and relay
Device K2 controls the break-make of relay according to the break-make of triode Q3.
As preferred：The relay on-off control circuit includes triode Q1, triode Q2, and triode Q1 collectors connect
Relay K1, emitter ground connection, base stage are connected between R7 and triode Q3, and triode Q2 collector connecting relay K2, emitter connects
Ground, base stage are connected between R7 and triode Q3.
As preferred：It is 12V for relay K1 and relay the K2 power supply powered, accessory power supply 5.1V is described
The resistance value of R1 is 47KF, and the resistance value of R2 is 51KF.
As preferred：The accessory power supply is transformer or Switching Power Supply.
As preferred：The optocoupler is the optocoupler that input terminal is bidirectional luminescence diode, the bidirectional luminescence diode
Optocoupler can be acted in the positive half cycle and negative half period of alternating current.
As preferred：The optocoupler internal body diodes end is controlled by the sampling voltage of RL resistance.
Compared with prior art, the utility model has the advantage of：During the entire process of charging to automobile, complete monitoring
Fire wire output end and zero line output end whether overcurrent or short circuit, if automobile charges normal without overcurrent or during short circuit, once overcurrent or
Short circuit occurs, and relay K1 and K2 will be quickly disconnected in the Millisecond time, realizes overcurrent or short-circuit protection.
Wherein：First, the structure of optocoupler includes diode input terminal and transistor output, and the utility model utilizes optocoupler
Characteristic, the pressure drop of diode input terminal is specific voltage value this inherent characteristic, using the voltage value as overcurrent
Or the judgement benchmark of short-circuit detecting, the transistor output after light-coupled isolation remove trigger protection circuit operation.Both overcurrent is realized
Or short-circuit detecting realizes the isolation of high and low pressure circuit again, kills two birds with one stone.
Second, the optocoupler selects the optocoupler that this kind of input terminals of TLP-184 or K3010 are bidirectional luminescence diode, to reach
Positive half cycle, negative half period to alternating current sine wave can detect whether overcurrent or short circuit purpose.
3rd, electronic component D6 and R3 are additionally arranged at operational amplifier, realizes the locking of overcurrent or short-circuit trigger signal,
After overcurrent or short-circuit protection occur, it is necessary to exclude overcurrent or short trouble and operating circuit is allowed to re-power reset, ability
Into next working cycles, enhance security.
4th, when overcurrent or short circuit occur, the high level of the output of operational amplifier directly drives triode Q3 conductings, will
" the actual control signal BF " of relay K1 and K2 be pulled down to ground, achieve the purpose that quick acting, from overcurrent or short circuit occur to
The reaction time of driving triode Q1, Q2 cut-off of relay K1 and K2 is Microsecond grade.Occur from overcurrent or short circuit to relay
K1, K2 are disconnected, the time of output terminals A C220V-OUT power failures is mainly determined by the separated mechanical response time of relay contact, this
Utility model selects about 7 milliseconds of relay model HF105F, total overcurrent or short-circuit protection time, if selecting other at high speed
Relay, overcurrent or short-circuit protection time can be shorter.
Description of the drawings
Fig. 1 is the utility model circuit diagram.
Specific embodiment
Below in conjunction with attached drawing, the utility model is described in further detail.
Embodiment 1：Referring to Fig. 1, control box short-circuit protection circuit on a kind of charging gun cable, including the firewire being arranged side by side
And zero curve, the firewire include firewire input terminal and fire wire output end, the zero curve includes zero curve input terminal and zero line output end,
A relay K1, relay K2 are respectively equipped on firewire and zero curve, and it is relay K1 and relay that one is equipped between firewire and zero curve
The power supply of device K2 power supplies；
Further include controller, accessory power supply, bleeder circuit, operational amplifier, optocoupler, triode Q3 and relay on-off control
Circuit processed；
The controller includes an external port CTR1 end, and the external port is connected with connecing the I/O port of controller, uses
In output low and high level；
The accessory power supply is for one reference voltage of output；
The bleeder circuit includes the R1 and R2 of series connection, and resistance value R1 is more than R2, and wherein R1 is connected with accessory power supply anode,
R2 is connected with accessory power supply cathode, forms closed circuit；
The optocoupler includes anode, cathode, collector and emitter；
The firewire or zero curve are equipped with the cathode that detection resistance RL, RL an input terminal connects optocoupler through resistance R10, output terminal
The anode of optocoupler is connect through resettable fuse RF, the collector of optocoupler connects the anode of accessory power supply, and emitter is divided into two-way, all the way
R5 connects the positive input of operational amplifier, is grounded all the way through R6；The output terminal of the operational amplifier is through diode D6, resistance
Feedback accesses its positive input after R3；
The output terminal of the triode Q3 base stages concatenation operation amplifier, collector connect CTR1 ends through a current-limiting resistance R7,
Emitter is grounded,
The base stage of the relay on-off control circuit input termination triode Q3, output terminal connection relay K1 and relay
Device K2 controls the break-make of relay according to the break-make of triode Q3.
In the present embodiment：The relay on-off control circuit includes triode Q1, triode Q2, triode Q1 collectors
Contact relay K1, emitter ground connection, base stage are connected between R7 and triode Q3, triode Q2 collector connecting relay K2, emitter
Ground connection, base stage are connected between R7 and triode Q3；It is 12V for relay K1 and relay the K2 power supply powered, accessory power supply
For 5.1V, the resistance value of the R1 is 47KF, and the resistance value of R2 is 51KF；The accessory power supply is transformer or Switching Power Supply；It is described
Optocoupler is the optocoupler that input terminal is bidirectional luminescence diode, and the optocoupler of the bidirectional luminescence diode can be in the positive half cycle of alternating current
It is acted with negative half period, the optocoupler internal body diodes end is controlled by the sampling voltage of RL resistance.
Embodiment 2：Referring to Fig. 1, for the ease of understanding, we explain the utility model with reference to specific circuit diagram.
Control box short-circuit protection circuit on a kind of charging gun cable, including the firewire and zero curve being arranged side by side, the firewire
Including firewire input terminal L-IN and fire wire output end L-OUT, the zero curve includes zero curve input terminal N-IN and zero line output end N-
OUT, L-OUT and N-OUT form AC220V-OUT ends, and a relay K1, relay K2, and fire are respectively equipped on firewire and zero curve
A power supply powered for relay K1 and relay K2 is equipped between line and zero curve, the voltage of the power supply is+12V；
Further include controller, accessory power supply, bleeder circuit, operational amplifier, optocoupler, triode Q3 and relay on-off control
Circuit processed；
The controller includes an external port CTR1 end, and the external port is connected with connecing the I/O port of controller, uses
In output low and high level；
The accessory power supply is for one reference voltage of output；In the present embodiment, reference voltage is+5.1V, and the present embodiment
In, it being realized using the transformer T1 of One In and Two Out, transformer T1 is connected between firewire and zero curve, generation two-way voltage output, and one
Supply voltages of the road+12V as relay, another way+5.1V are used as reference voltage；
The bleeder circuit includes the R1 of series connection and the resistance value of R2, R1 for 47KF, and the resistance value of R2 is 51K, wherein R1 with it is auxiliary
Positive pole is helped to connect, R2 is connected with accessory power supply cathode, forms closed circuit；
The optocoupler includes anode, cathode, collector and emitter；
It is the resistance of high-power small resistance value that the firewire or zero curve, which are equipped with detection resistance a RL, the resistance RL, works as fire
When line short circuit or overcurrent, the high current generated on circuit can be converted into voltage difference, resistance RL selects constantan wire or impedance to close
Other similar resistance that can bear super large dash current such as a suitable section lead；RL input terminals connect the cathode of optocoupler through resistance R10,
Output terminal connects the anode of optocoupler through resettable fuse RF, and the collector of optocoupler connects the anode of accessory power supply, and emitter is divided into two
Road, all the way R5 connect the positive input of operational amplifier, be grounded all the way through R6；The output terminal of the operational amplifier is through diode
Feedback accesses its positive input after D6, resistance R3；RL connects optocoupler close to one end of fire wire output end through resettable fuse RF
Anode, the other end connects the cathode of optocoupler through resistance R10, and the collector of optocoupler connects the anode of accessory power supply, and emitter is divided into two
Road, all the way R5 connect the positive input of operational amplifier, be grounded all the way through R6；R10 plays metering function, and RF, which is selected from, to be recovered to insure
Pipe, the two protect optocoupler IC2 jointly；
The output terminal of the operational amplifier is fed back after diode D6, resistance R3 accesses its positive input；
The output terminal of the triode Q3 base stages concatenation operation amplifier, collector connect CTR1 ends through a current-limiting resistance R7,
Emitter is grounded；
The relay on-off control circuit include triode Q1, triode Q2, triode Q1 collector connecting relay K1,
Emitter is grounded, and base stage is connected between R7 and triode Q3, triode Q2 collector connecting relay K2, and emitter ground connection, base stage connects
Between R7 and triode Q3；The accessory power supply is transformer or Switching Power Supply；The optocoupler is bidirectional luminescence two for input terminal
The optocoupler of pole pipe.
The principle that triode Q3 controls relay on-off control circuit is：Triode Q3 emitters are grounded, and work as triode
Q3 is turned on, and, when triode Q3 is not turned on, collector meets CTR1 through current-limiting resistance R7 by the voltage pull-down of its collector on earth
End, voltage are controlled by the voltage at CTR1 ends, set a point for ease of description, at triode Q3 collectors as BF, the point
Voltage value, then be relay K1 and relay K2 " actual control signal BF ".
The utility model is still detected using current system, i.e., one high-power small resistance value of series connection on zero curve or firewire
The high current generated when resistance RL is by overcurrent or short circuit is converted into voltage difference；Directly by RL both end voltages difference by element RF with
The light-emitting diodes pipe end i.e. optocoupler IC2 input terminals of optocoupler IC2, the forward and reverse pressure drop of optocoupler IC2 light emitting diodes are added in after R10
It is specific voltage value this inherent characteristic, using this by the use of specific voltage value as the judgement of overcurrent or short-circuit detecting
Benchmark.
Meanwhile using the buffer action of optocoupler, this overcurrent or the isolation of short-circuit detecting result are transferred to low-voltage control terminal；
R10 plays metering function, and RF, which is selected from, recovers protective tube, and the two protects optocoupler IC2 jointly.
In the present embodiment, optocoupler IC2 selects the optocoupler of this bidirectional luminescence diodes of TLP-184 or K3010, and structure includes
One input terminal light emitting diode and output terminal triode, input terminal light emitting diode rated voltage drop are ± 1.2V, when overcurrent or
When short circuit causes the pressure difference at RL both ends to be more than ± 1.2V, the conducting of optocoupler interior light emitting diodes shines, three poles inside optocoupler
Pipe turns on, and accessory power supply+5.1V is added to after this triode on R6, then is added to after filtering out interference by R5, C2 filter circuit
1 foot of amplifier IC1 anodes.
Accessory power supply+5.1V generates 2.55V benchmark by R1, R2 partial pressure and is added to 3 foot of amplifier IC1 negative terminals, and amplifier is operated in ﹣
1 foot voltage of amplifier IC1 anodes is higher than 3 foot of negative terminal, 4 foot of amplifier output high level, warp when comparator pattern, overcurrent or short circuit occur
Triode Q3 conductings are driven after crossing R4 current limlitings, " actual control signal BF " is pulled down to ground wire, triode Q1, Q2 cut-off, relay
Device K1, K2 are disconnected, and C220V-OUT ends out-put supply is truncated, it is achieved thereby that overcurrent or short-circuit protection, from detecting
The output of AC220V-OUT ends is truncated mainly to be determined total time by the mechanical action time of relay K1, K2, about 7mS.
In addition：The high level of 4 foot of amplifier output is added to 1 foot of amplifier as positive feedback after D6 isolates R3 current limlitings, to reach
To the purpose of triggering locking.After the output of AC220V-OUT ends is truncated, the high current for flowing through RL disappears, and 2 voltage differences of RL are
Transistor output in zero, optocoupler IC2 disconnects.Amplifier output is maintained at high level by positive feedback locking, and overcurrent or short circuit are protected
Shield is always maintained at effectively by lock function, and reset is only re-powered after circuit power down, and 4 foot of amplifier output low level could solve
Except protection, into next working cycles.
RL detection resistances can be designed on the input firewire L-IN of AC220V-IN or zero curve N-IN, can also be designed
On the firewire L-OUT of output terminals A C220V-OUT or zero curve N-OUT.4 its operation principles of position and effect are just the same.
The schematic diagram illustrated by the utility model：Optocoupler IC2 input terminal light emitting diodes rated voltage drop is ± 1.2V, works as RL
Overcurrent or short-circuit protection action are just triggered when the pressure difference at both ends is more than ± 1.2V.RL=0.003, then overcurrent or short-circuit protection triggering
Electric current=0.003=400A of ± 1.2V ÷.As it can be seen that overcurrent or short-circuit protection trigger current size can be appointed by the resistance value size of RL
Meaning setting.
+ the 12V that accessory power supply T1 is provided gives relay K1, K2 coil power supply, and+5.1V powers to the utility model circuit.
The accessory power supply can be that linear power supply can also be Switching Power Supply.Due to the buffer action of optocoupler IC2 ,+12V and+5.1V is equal
It is operated in low tension drive test, it is possible to its ground wire is connected to a ground, share reference ground.
Claims (6)
1. control box short-circuit protection circuit on a kind of charging gun cable, including the firewire and zero curve being arranged side by side, the firewire bag
Firewire input terminal and fire wire output end are included, the zero curve includes zero curve input terminal and zero line output end, it is characterised in that：Firewire and
A relay K1, relay K2 are respectively equipped on zero curve, and one is equipped between firewire and zero curve and is supplied for relay K1 and relay K2
The power supply of electricity；
Further include controller, accessory power supply, bleeder circuit, operational amplifier, optocoupler, triode Q3 and relay on-off control electricity
Road；
The controller includes an external port CTR1 end, and the external port is connected with connecing the I/O port of controller, for defeated
Go out low and high level；
The accessory power supply is for one reference voltage of output；
The bleeder circuit includes the R1 and R2 of series connection, and resistance value R1 is more than R2, and wherein R1 is connected with accessory power supply anode, R2 and
Accessory power supply cathode connects, and forms closed circuit；
The optocoupler includes anode, cathode, collector and emitter；
The firewire or zero curve are equipped with the cathode that detection resistance RL, RL an input terminal connects optocoupler through resistance R10, and output terminal passes through certainly
Recover the anode that fuse RF connects optocoupler, the collector of optocoupler connects the anode of accessory power supply, and emitter is divided into two-way, and R5 connects all the way
The positive input of operational amplifier, is grounded all the way through R6；The output terminal of the operational amplifier is after diode D6, resistance R3
Feedback accesses its positive input；
The output terminal of the triode Q3 base stages concatenation operation amplifier, collector connect CTR1 ends through a current-limiting resistance R7, transmitting
Pole is grounded；
The base stage of the relay on-off control circuit input termination triode Q3, output terminal connection relay K1 and relay
K2 controls the break-make of relay according to the break-make of triode Q3.
2. control box short-circuit protection circuit on charging gun cable according to claim 1, it is characterised in that：The relay
On-off control circuit includes triode Q1, triode Q2, triode Q1 collector connecting relay K1, and emitter is grounded, and base stage connects
Between R7 and triode Q3, triode Q2 collector connecting relay K2, emitter is grounded, and base stage is connected between R7 and triode Q3.
3. control box short-circuit protection circuit on charging gun cable according to claim 1, it is characterised in that：For relay K1
Power supply with relay K2 power supplies is 12V, and the resistance value of accessory power supply 5.1V, the R1 are 47KF, and the resistance value of R2 is
51KF。
4. control box short-circuit protection circuit on charging gun cable according to claim 1, it is characterised in that：The auxiliary electricity
Source is transformer or Switching Power Supply.
5. control box short-circuit protection circuit on charging gun cable according to claim 1, it is characterised in that：The optocoupler is
Input terminal is the optocoupler of bidirectional luminescence diode, and the optocoupler of the bidirectional luminescence diode can be in the positive half cycle of alternating current and negative half
Week action.
6. control box short-circuit protection circuit on charging gun cable according to claim 1, it is characterised in that：In the optocoupler
Portion diode end is controlled by the sampling voltage of RL resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721396571.7U CN207381966U (en) | 2017-10-26 | 2017-10-26 | Control box short-circuit protection circuit on charging gun cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721396571.7U CN207381966U (en) | 2017-10-26 | 2017-10-26 | Control box short-circuit protection circuit on charging gun cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207381966U true CN207381966U (en) | 2018-05-18 |
Family
ID=62336327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721396571.7U Active CN207381966U (en) | 2017-10-26 | 2017-10-26 | Control box short-circuit protection circuit on charging gun cable |
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| CN (1) | CN207381966U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611948A (en) * | 2017-10-26 | 2018-01-19 | 绵阳高新区探索科技有限责任公司 | Control box short-circuit protection circuit on charging gun cable |
-
2017
- 2017-10-26 CN CN201721396571.7U patent/CN207381966U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611948A (en) * | 2017-10-26 | 2018-01-19 | 绵阳高新区探索科技有限责任公司 | Control box short-circuit protection circuit on charging gun cable |
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