CN207408524U - Control box has access to electricity short-circuit detecting circuit on charging gun cable - Google Patents
Control box has access to electricity short-circuit detecting circuit on charging gun cable Download PDFInfo
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- CN207408524U CN207408524U CN201721390800.4U CN201721390800U CN207408524U CN 207408524 U CN207408524 U CN 207408524U CN 201721390800 U CN201721390800 U CN 201721390800U CN 207408524 U CN207408524 U CN 207408524U
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Abstract
Have access to electricity short-circuit detecting circuit the utility model discloses control box 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, relay K2 are respectively equipped on firewire and zero curve；Further include controller, accessory power supply, operational amplifier, optocoupler, triode Q1, triode Q2, triode Q3.The utility model it is critical that：Before being detected end access failure high voltage, first go to detect by the way of low voltage excitation tested end whether short circuit, if there is short circuit, then by the way that operation is protected to make high voltage that can not be output to detected port.It detects that after short circuit, high voltage just is not output to detected port, improves security, and the protection of the quick response realization high speed using hardware mode.
Description
Technical field
The utility model is related to control box electric short circuits on a kind of power-on protective circuit more particularly to a kind of charging gun cable
Detection circuit.
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, charging can be generally set
Defencive function.
In the traditional method of short-circuit protection：One type is to judge to be detected whether terminal voltage is zero, it is believed that after short circuit,
It is zero to detect terminal voltage, then starting protection.Another type is to determine whether exceeded electric current by being detected end, so
After decide whether starting protection.The shortcomings that these two kinds of methods is common is to be detected end in the case where being electrified, and detection is protected
What protection circuit was just started to work, for the occasion of some high voltage operations, protected after first charged in the presence of certain dangerous.
The content of the invention
The purpose of this utility model is that providing one kind solves the above problems, and also can before being detected end access failure high voltage
Test whether short circuit, and if there is short circuit, the then charging by the way that operation is protected to make high voltage that can not be output to detected port
Control box has access to electricity short-circuit detecting circuit on rifle cable.
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 has access to electricity short-circuit detecting circuit, and including the firewire and zero curve being arranged side by side, the firewire includes firewire input terminal and firewire is defeated
Outlet, the zero curve include zero curve input terminal and zero line output end, a relay K1, relay being respectively equipped on firewire and zero curve
K2；
Further include controller, accessory power supply, operational amplifier, optocoupler, triode Q1, triode Q2, triode Q3；
The controller includes two external port CTR1 ends and CTR2 ends, the external port and the I/O port for connecing controller
Connection, for exporting low and high level；
The accessory power supply is arranged between firewire and zero curve, is generated two output voltage, is all the way relay K1 and relay
Device K2 powers, all the way for one driving voltage of generation；
The anode of the driving voltage is connected after resistance R1 and R2 with cathode, and driving voltage anode is also started to exchange fire through resistance R4
Line output terminal, cathode connect zero line output end through resistance R5；
Between the positive output termination R1 and R2 of operational amplifier, inverse output terminal is started to exchange fire line output terminal through resistance R6；
The optocoupler includes anode, cathode, collector and emitter, and the anode connects the output terminal of operational amplifier, cloudy
Pole connects zero line output end through resistance R3, and collector connects CTR1 ends through resistance R7, and emitter connects the collector of triode Q3, and described three
The base stage of grade pipe Q3 connects CTR2 ends, emitter ground connection；
Triode Q1 collectors contact relay supply voltage all the way, all the way contact relay K1, emitter ground connection, base stage
It is connected between R7 and optocoupler；
Triode Q2 collectors contact relay supply voltage all the way, all the way contact relay K2, emitter ground connection, base stage
It is connected between R7 and optocoupler；
And in resistance value, R2>R1, R4=R5.
As preferred：The two output voltage, the voltage for being relay power supply is 12V, generates the voltage of driving voltage
For 5.1V, the resistance value of the R1 is 47KF, and the resistance value of R2 is 51KF.
As preferred：The accessory power supply is transformer or the electric power supply of switch.
Compared with prior art, the utility model has the advantage of：Before end access failure high voltage is detected, first using low
The mode of voltage drive go to detect tested end whether short circuit, if there is short circuit, then by the way that operation is protected to make high voltage at all
Detected port will not be output to.It detects without after short circuit, high voltage just being output to detected port, improves safety
Property.
Wherein：First：Accessory power supply provides driving voltage by resistance R4, R5 to output line L-OUT and N-OUT, then
It samples to realize port L-OUT and detection whether N-OUT short circuits by resistance R6.
Second：Control signal CTR1 forms " actual control signal BF " after resistance R7 current limlitings, and L-OUT is short with N-OUT
" the actual control signal BF " of relay K1, K2 is pulled down to ground wire by Lu Shi by the conducting of optocoupler output triode, make after
Electric appliance K1, K2 can not be closed, and the quick response of hardware mode realizes the protection of high speed.
3rd：The base stage suspension control signal CTR2 controls of triode a Q3, Q3 are added after optocoupler, so that this practicality
The new short-circuit protection function that whether starts is under software control, and CTR2 is logic high, and triode Q3 is just turned on, short-circuit protection work(
It can just work.CTR2 is logic low, and triode Q3 ends, and short-circuit protection function does not work.
The utility model forms AC220V-OUT ends in fire wire output end L-OUT and zero line output end N-OUT, in relay
K1 and K2 closures are, when no short-circuit relay K1 whether short-circuit to L-OUT and N-OUT before automobile charging, is first detected before
It could be closed with K2.If short-circuit, relay K1 and K2 will be unable to be closed, and AC220V-OUT ends do not have voltage output, improve peace
Full performance.
Description of the drawings
Fig. 1 is the utility model real circuit figure.
Specific embodiment
Below in conjunction with attached drawing, the utility model is described in further detail.
Embodiment 1：Referring to Fig. 1, control box has access to electricity short-circuit detecting circuit on a kind of charging gun cable, including what is be arranged side by side
Firewire and zero curve, the firewire include firewire input terminal L-IN and fire wire output end L-OUT, and the zero curve includes zero curve input terminal
N-IN and zero line output end N-OUT, fire wire output end L-OUT and zero line output end N-OUT form AC220-OUT, firewire and zero
A relay K1, relay K2 are respectively equipped on line；
Further include controller, accessory power supply, operational amplifier, optocoupler, triode Q1, triode Q2, triode Q3；
The controller includes two external port CTR1 ends and CTR2 ends, the external port and the I/O port for connecing controller
Connection, for exporting low and high level；
The accessory power supply is arranged between firewire and zero curve, is generated two output voltage, is all the way relay K1 and relay
Device K2 powers, all the way for one driving voltage of generation；
The anode of the driving voltage is connected after resistance R1 and R2 with cathode, and driving voltage anode is also started to exchange fire through resistance R4
Line output terminal, cathode connect zero line output end through resistance R5；
Between the positive output termination R1 and R2 of operational amplifier, inverse output terminal is started to exchange fire line output terminal through resistance R6；
The optocoupler includes anode, cathode, collector and emitter, and the anode connects the output terminal of operational amplifier, cloudy
Pole connects zero line output end through resistance R3, and collector connects CTR1 ends through resistance R7, and emitter connects the collector of triode Q3, and described three
The base stage of grade pipe Q3 connects CTR2 ends, emitter ground connection；
Triode Q1 collectors contact relay supply voltage all the way, all the way contact relay K1, emitter ground connection, base stage
It is connected between R7 and optocoupler；
Triode Q2 collectors contact relay supply voltage all the way, all the way contact relay K2, emitter ground connection, base stage
It is connected between R7 and optocoupler；
And in resistance value, R2>R1, R4=R5.
In the present embodiment：The two output voltage, the voltage for being relay power supply is 12V, generates the electricity of driving voltage
It presses as 5.1V, the resistance value of the R1 is 47KF, and the resistance value of R2 is 51K.
Embodiment 2：Referring to Fig. 1, in order to better illustrate the utility model, we are said with reference to physical circuit
It is bright.
Control box has access to electricity short-circuit detecting circuit on a kind of charging gun cable, described including the firewire and zero curve being arranged side by side
Firewire includes firewire input terminal L-IN and fire wire output end L-OUT, and the zero curve includes zero curve input terminal N-IN and zero line output
N-OUT, L-OUT and N-OUT is held to form AC220V-OUT ends, a relay K1, relay K2 are respectively equipped on line and zero curve；Also
Including controller, accessory power supply, operational amplifier IC1, optocoupler IC2, triode Q1, triode Q2, triode Q3；The control
Device includes two external port CTR1 ends and CTR2 ends, and the external port is connected with connecing the I/O port of controller, for exporting height
Low level；The accessory power supply T1 is arranged between firewire and zero curve, and+the 12V that accessory power supply T1 is provided gives relay K1, K2 coil
Power supply ,+5.1V are driving voltage.The accessory power supply can be that linear power supply can also be Switching Power Supply；In the present embodiment, use
One input, the transformer of two outputs；The anode of the driving voltage is connected after resistance R1 and R2 with cathode, driving voltage anode
It also starts to exchange fire line output terminal through resistance R4, cathode connects zero line output end through resistance R5；Herein, the resistance value of R1 be 47KF, the resistance of R2
It is worth for 51K, R4 resistance is identical with R5；Between the positive output termination R1 and R2 of operational amplifier, inverse output terminal is through resistance R6
It starts to exchange fire line output terminal；The optocoupler IC2 includes anode, cathode, collector and emitter, and the anode meets operational amplifier IC1
Output terminal, cathode connects zero line output end through resistance R3, and collector connects CTR1 ends through resistance R7, and R7 resistance values are 1K, and emitter connects
The collector of triode Q3, the base stage of the triode Q3 connect CTR2 ends, emitter ground connection；The triode Q1 collectors are all the way
Contact relay supply voltage, contact relay K1, emitter ground connection, base stage are connected between R7 and optocoupler all the way；The triode Q2 collection
Electrode contact relay supply voltage all the way, contact relay K2, emitter ground connection, base stage are connected between R7 and optocoupler all the way.
Simultaneously for circuit work well, there are a series of matched bypass circuits, if 5.1V voltages and 12V voltages are defeated
Outlet is respectively equipped with diode D1, a D3, the shunt circuit that capacitance C1 and diode D2 are formed, and be connected in parallel on 5.1V voltages and
Between GND, the inverse output terminal of operational amplifier IC1 is also grounded through capacitance C2, is disturbed for filtering clutter.
For ease of description, at the collector connecting resistance R7 of our IC2 in figure, a point is set, which is
CTR1 obtains signal after the current limliting of 1K resistance R7, is " the actual control signal BF " of relay K1 and K2.
This circuit is as follows with function in itself：When output terminal L-OUT and N-OUT is not short-circuit, and CTR1 signals are logic
During high level, triode Q1, Q2 conducting, accessory power supply+12V electric currents flow through relay coil, and relay is closed；CTR1 signals are
During logic low, triode Q1, Q2 cut-off, relay coil electric current is zero, and relay disconnects.
Utility model works principle is as follows：
It is sent in controller before control signal CTR1 allows relay to be closed, makes CTR2 first as logic high, three poles
Pipe Q3 is turned on, and optocoupler IC2 enters effective status to start short-circuit protection function.Accessory power supply+5.1V is divided by resistance R1, R2
Afterwards reference voltage about 2.65V is provided to the positive input terminal of comparator IC1.Accessory power supply+5.1V is by resistance R4, R5 to output line
L-OUT and N-OUT provides driving voltage, resistance R4=R5, first, metering function is played, second is that from when L-OUT and N-OUT short circuits
Partial pressure acts on.3 foot of negative input end of comparator IC1 is connected to L-OUT by resistance R6, and therefore, 3 foot of negative input end of IC1 is
L-OUT and detection signal input port whether N-OUT short circuits, resistance R6 play metering function, and capacitance C2 does for filtering clutter
It disturbs.When output port L-OUT and N-OUT be not short-circuit, by resistance R4 be loaded into+5.1V voltages on L-OUT not with R5 shapes
Into pressure divider circuit, the 3 foot voltage of negative input end of IC1 is close to+5.1V, more than 1 foot reference voltage 2.65V of positive input terminal, comparator
The output of 4 foot of IC1 output terminals is low level, and optocoupler IC2 interior light emitting diodes do not have electric current, and optocoupler output triode is in and opens
Line state, " the actual control signal BF " of relay is unaffected, at this time can by CPU program CTR1 logic high or
Low level realizes that relay is closed or disconnects control.As output port L-OUT and N-OUT short circuits, it is loaded by resistance R4
+ 5.1V voltages on L-OUT form pressure divider circuit with R5, due to R4=R5, so intrinsic standoff ratio is R4:R5=1:1, IC1 bear is defeated
Enter end 3 foot voltages=5.1,2=2.55V of ÷, exported less than 1 foot reference voltage 2.65V, comparator IC1 output terminal of positive input terminal, 4 foot
For high level, optocoupler IC2 interior light emitting diodes have electric current to flow through, and optocoupler output triode enters conducting state.Due to this
When triode Q3 conducting, optocoupler switched on " actual control signal BF " of the control signal CTR1 after resistance R7 current limlitings is with leading
Logical triode Q3 is pulled down to ground wire, and BF voltages are turned off close to 0V, triode Q1, Q2.Therefore no matter CTR1 is logically high electricity
Whether flat, relay K1, K2 will be off, so as to fulfill output short circuit protection.
When CTR2 is logic low, triode Q3 cut-offs.No matter whether the output terminal triode of optocoupler IC2 turns on,
Relay " actual control signal BF ", optocoupler, triode Q3 do not form the circuit of conducting over the ground, and short-circuit protection circuit is caused not rise
Effect achievees the purpose that close short-circuit protection function.
+ 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.
Claims (3)
1. control box has access to electricity short-circuit detecting circuit on a kind of charging gun cable, including the firewire and zero curve being arranged side by side, the fire
Line includes firewire input terminal and fire wire output end, and the zero curve includes zero curve input terminal and zero line output end, it is characterised in that：Fire
A relay K1, relay K2 are respectively equipped on line and zero curve；
Further include controller, accessory power supply, operational amplifier, optocoupler, triode Q1, triode Q2, triode Q3；
The controller includes two external port CTR1 ends and CTR2 ends, the external port and the I/O port company for connecing controller
It connects, for exporting low and high level；
The accessory power supply is arranged between firewire and zero curve, is generated two output voltage, is all the way relay K1 and relay K2
Power supply, all the way for one driving voltage of generation；
The anode of the driving voltage is connected after resistance R1 and R2 with cathode, and driving voltage anode is also defeated through resistance R4 lines of starting to exchange fire
Outlet, cathode connect zero line output end through resistance R5；
Between the positive output termination R1 and R2 of operational amplifier, inverse output terminal is started to exchange fire line output terminal through resistance R6；
The optocoupler includes anode, cathode, collector and emitter, and the anode connects the output terminal of operational amplifier, cathode warp
Resistance R3 connects zero line output end, and collector connects CTR1 ends through resistance R7, and emitter connects the collector of triode Q3, the triode
The base stage of Q3 connects CTR2 ends, emitter ground connection；
Triode Q1 collectors contact relay supply voltage all the way, contact relay K1, emitter ground connection, base stage are connected on all the way
Between R7 and optocoupler；
Triode Q2 collectors contact relay supply voltage all the way, contact relay K2, emitter ground connection, base stage are connected on all the way
Between R7 and optocoupler；
And in resistance value, R2>R1, R4=R5.
2. control box has access to electricity short-circuit detecting circuit on charging gun cable according to claim 1, it is characterised in that：Described two
Road output voltage, the voltage for being relay power supply is 12V, generates the voltage of driving voltage as 5.1V, the resistance value of the R1 is
The resistance value of 47KF, R2 are 51KF.
3. control box has access to electricity short-circuit detecting circuit on charging gun cable according to claim 1, it is characterised in that：It is described auxiliary
Power supply is helped as transformer or the electric power supply of switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721390800.4U CN207408524U (en) | 2017-10-26 | 2017-10-26 | Control box has access to electricity short-circuit detecting circuit on charging gun cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721390800.4U CN207408524U (en) | 2017-10-26 | 2017-10-26 | Control box has access to electricity short-circuit detecting circuit on charging gun cable |
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| Publication Number | Publication Date |
|---|---|
| CN207408524U true CN207408524U (en) | 2018-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721390800.4U Active CN207408524U (en) | 2017-10-26 | 2017-10-26 | Control box has access to electricity short-circuit detecting circuit on charging gun cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107688133A (en) * | 2017-10-26 | 2018-02-13 | 绵阳高新区探索科技有限责任公司 | Control box has access to electricity short-circuit detecting circuit on charging gun cable |
-
2017
- 2017-10-26 CN CN201721390800.4U patent/CN207408524U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107688133A (en) * | 2017-10-26 | 2018-02-13 | 绵阳高新区探索科技有限责任公司 | Control box has access to electricity short-circuit detecting circuit on charging gun cable |
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