CN206710558U - High voltage connector state micro-current injection detection circuit and detecting system - Google Patents
High voltage connector state micro-current injection detection circuit and detecting system Download PDFInfo
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- CN206710558U CN206710558U CN201720033789.XU CN201720033789U CN206710558U CN 206710558 U CN206710558 U CN 206710558U CN 201720033789 U CN201720033789 U CN 201720033789U CN 206710558 U CN206710558 U CN 206710558U
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- contactor
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- current injection
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Abstract
The utility model discloses a kind of high voltage connector state micro-current to inject detection circuit and detecting system, using insulating power supply, toward the switch contact Injection Current of detected contactor, flows through the electric current of resistance by detection to judge the switch contact state of contactor.If electric current is detected, then it represents that the switch contact closure of contactor；When detecting no current, then it represents that the switch contact of contactor disconnects.Realize that compared with mechanical assistance contact, reliability is higher, and service life is longer using electronic device completely.During circuit of the present utility model work, independent of high-tension electricity, system not on before high pressure, it is possible to detect the state of D.C. contactor.In test circuit, D.C. contactor be one can break-make conductor, and whether upper high pressure is unrelated.
Description
Technical field
The utility model belongs to new-energy automobile high-voltage safety field, and in particular to a kind of high voltage connector state micro-current
Injection detection circuit and detecting system.
Background technology
With the popularization of new-energy automobile, high-voltage safety is increasingly paid attention to by producer and user, and high voltage connector is made
For the important component of high-pressure system, the reliability and security of its work are directly connected to vehicle safety.New energy at present
There are the following problems for the application of the D.C. contactor of automobile using：
1st, most of D.C. contactor does not have auxiliary contact, can not feed back the working condition of D.C. contactor.When direct current connects
After tentaculum goes wrong, vehicle and driver can not know malfunction in time, potential safety hazard be present.
2nd, a small number of D.C. contactors for having auxiliary contact, auxiliary contact work is unreliable, with contactor opening/closing frequency
Increase, the change of spring performance and the abrasion of mechanical structure, auxiliary contact and main contacts can be caused to act asynchronous, serious feelings
Auxiliary contact fail under condition.
3rd, to the test of contactor state, voltage detecting method is generally used at present.The voltage at contactor both ends is gathered, is passed through
Logical calculated, judge the current state of contactor.The problem of this method, is：First, vehicle must first go up high pressure, in access failure
In the case of high pressure, contactor both end voltage can not be gathered, can not also judge contactor state；Secondly as in high-pressure system
Electric capacity be present, after contactor disconnects, the voltage of contactor rear end will not decline at once, can not judge the shape of contactor in time
State；Again, precision resistance and linear optical coupling will be used all the way because voltage detecting circuit is every, therefore cost is higher.
The content of the invention
Technical problem to be solved in the utility model is：A kind of high voltage connector state micro-current injection detection electricity is provided
Road and detection method and system, it is high to solve current new-energy automobile D.C. contactor voltage detection method accuracy rate low cost
Problem.
The utility model uses following technical scheme to solve above-mentioned technical problem：
High voltage connector state micro-current injection detection circuit, including power circuit, microprocessor, communicating circuit, output
Control circuit, signal sample circuit, sampling resistor, isolated DC power supply, controlling switch and diode, wherein, power circuit
The input of input connection external power source, output end and isolated DC power supply connects；The cathode output end of isolated DC power supply
It is connected with one end of sampling resistor, cathode output end connection is tested the other end of contactor negative terminal sampling resistor and the sun of diode
Pole connects, and the negative electrode of diode and one end of controlling switch connect, the anode of the tested contactor of other end connection of controlling switch；
Both ends, output end and the microprocessor that the input of signal acquisition circuit is connected in parallel in sampling resistor connect；Microprocessor point
It is not connected with power circuit, communicating circuit, output control circuit；The output end of output control circuit and the control terminal of controlling switch
Connection.
The output voltage of power circuit is 5V.
The communicating circuit uses CAN communication circuit.
A kind of new-energy automobile high-pressure system, including power supply, high voltage power distributing cabinet, electrical equipment, the positive pole of electrical equipment with
Positive source connection, negative pole and power cathode connect, and total positive contactor of being connected between the positive pole and positive source of electrical equipment, use
Connected between the negative pole of electric equipment and power cathode and always bear contactor, precharge group and preliminary filling contactor are parallel to after being connected in series
The both ends of total positive contactor, the both ends of total negative contactor are connected in parallel high voltage connector state micro-current injection detection circuit, always
Positive contactor, always negative contactor, precharge group, preliminary filling contactor, high voltage connector state micro-current injection detection circuit are all provided with
It is placed in high voltage power distributing cabinet.
The electrical equipment includes the mechanical, electrical air-conditioning of electricity, electricity turns to.
Compared with prior art, the utility model has the advantages that：
1st, the utility model proposes one kind detection D.C. contactor state detection circuit and detection method, the circuit are complete
Realized using electronic device, compared with mechanical assistance contact, reliability is higher, and service life is longer.
2nd, during circuit of the present utility model work, independent of high-tension electricity, system not on before high pressure, it is possible to detect
The state of D.C. contactor.In test circuit, D.C. contactor be one can break-make conductor, and whether upper high pressure is unrelated.
3rd, during circuit of the present utility model work, do not influenceed by electric capacity in system because the flowing of Injection Current only with
The state of D.C. contactor is relevant, contactor closure, electric current flowing；Contactor disconnects, and electric current stops.And Injection Current only passes through
The switch sections of D.C. contactor, the circuit (such as electric machine controller) connected without contactor rear end.
Brief description of the drawings
Fig. 1 is new-energy automobile high-pressure system general principle figure.
Fig. 2 is the utility model contactor state detection unit circuit module connection figure.
Fig. 3 is contactor state detection unit circuit diagram.
Wherein, being identified as in figure：1- controlling switches；2- sampling resistors；3- dc sources；4- selecting switch；The poles of 5- bis-
Pipe.
Embodiment
As shown in Figure 2 and Figure 3, high voltage connector state micro-current injection detection circuit, including power circuit, microprocessor,
Communicating circuit, output control circuit, signal sample circuit, sampling resistor, isolated DC power supply, controlling switch and diode, its
In, the output voltage of power circuit is 5V, provides dc source power supply for other modules, the input connection of power circuit is outside
The input connection of power supply, output end and isolated DC power supply；The cathode output end of isolated DC power supply and the one of sampling resistor
The anode of end connection, the other end of the tested contactor negative terminal sampling resistor of cathode output end connection and diode connects, diode
Negative electrode and one end of controlling switch connect, the anode of the tested contactor of the other end of controlling switch connection；Signal acquisition circuit
Input be connected in parallel in the both ends of sampling resistor, output end and microprocessor and connect；Microprocessor respectively with power circuit,
Communicating circuit, output control circuit connection；The output end of output control circuit and the control terminal of controlling switch connect.
The communicating circuit uses CAN communication circuit, and CAN communication is car gage communication interface, but CAN communication is used
In on detection circuit, still for the first time, detection circuit originally passes through analog quantity mouth output signal, corresponding electricity to category in the prior art
Control unit gathers the signal, and because circuit will match, the general circuit and ECU of detecting will correspond due to CAN communication
It is standard interface, detecting need not correspond between circuit and ECU, while multiple ECUs can exist simultaneously
Signal is obtained in CAN network simultaneously.
As shown in figure 1, a kind of new-energy automobile high-pressure system, including power supply (the power supply bag i.e. in figure), high voltage power distributing cabinet,
Electrical equipment, the positive pole of electrical equipment is connected with positive source, the connection of negative pole and power cathode, the positive pole and power supply of electrical equipment
Connected between positive pole total positive contactor, always negative contactor of connect between the negative pole and power cathode of electrical equipment, precharge group with
Preliminary filling contactor is parallel to the both ends of total positive contactor after being connected in series, the both ends of total negative contactor are connected in parallel high voltage connector
State micro-current injection detection circuit, total positive contactor, always bears contactor, precharge group, preliminary filling contactor, high voltage connector shape
State micro-current injection detection circuit may be contained within high voltage power distributing cabinet.
In order to control the break-make of high-tension electricity, D.C. contactor is mounted with high voltage power distributing cabinet, wagon control and safety need
Implement the state of grasp D.C. contactor, it is therefore desirable to contactor state detection unit, the D.C. contactor that needs are measured
Both ends be connected in detection unit.
The electrical equipment includes the mechanical, electrical air-conditioning of electricity, electricity turns to.
The detection method of high voltage connector state micro-current injection detection circuit, comprises the following steps：
Step 1, microcontroller send control signal, controlling switch closure to output control circuit；
Step 2, microcontroller collection flow through the voltage signal at sampling resistor both ends；
Step 3, microcontroller determine whether that electric current flows through sampling resistor by the voltage signal collected, if so,
Step 4 is performed, otherwise, judges that always negative contactor is off, and terminates test；
Step 4, judge that always negative contactor is in closure state, microprocessor control is always born contactor and disconnected, and terminates test.
Specific embodiment,
The invention can also be extended to multichannel, and multiple D.C. contactors are tested, and each measuring circuit can share directly
Power supply 3 is flowed, generally, has total positive contactor in new-energy automobile high voltage power distributing cabinet, always bear contactor, preliminary filling contactor etc.
Multiple D.C. contactors, each contactor are required for monitor state, it is therefore desirable to multi-way detecting function, contactor state-detection list
In member, there is multiple switch 4, there are more docking ports, be tested contactor just, tested contactor is born, and single-chip microcomputer is by selecting switch 4 come certainly
It is fixed which D.C. contactor is tested.
The operation principle of the utility model detection circuit is as follows：
The micro-current injection detection method of D.C. contactor state, using insulating power supply, the switch toward detected contactor touches
Point Injection Current, the electric current of resistance is flowed through by detection to judge the switch contact state of contactor.If having detected electric current,
Then represent the switch contact closure of contactor；When detecting no current, then it represents that the switch contact of contactor disconnects.
The power supply of vehicle is converted into 5V by power circuit, is powered to microcontroller, isolated DC power supply, communicating circuit etc..
D.C. contactor is tested, microcontroller closes controlling switch by output control circuit first, isolated DC power supply
Can output injection electric current.If tested D.C. contactor closure, Injection Current are just reached by D.C. contactor and adopted
Sample resistance 2, the voltage signal at single-chip microcomputer collection sampling resistor both ends, it is possible to which judgement is that have electric current to flow through sampling resistor, i.e.,
Judge whether D.C. contactor closes.After being completed, microcontroller disconnects controlling switch 1 by output control circuit.Two
The effect of pole pipe 5 is to prevent high-tension electricity from influenceing measuring circuit.
Claims (5)
1. high voltage connector state micro-current injection detection circuit, it is characterised in that：Including power circuit, microprocessor, communication
Circuit, output control circuit, signal sample circuit, sampling resistor, isolated DC power supply, controlling switch and diode, wherein, electricity
The input that the input of source circuit connects external power source, output end and isolated DC power supply connects；Isolated DC power supply is just
The connection of one end of pole output end and sampling resistor, the other end and two of the tested contactor negative terminal sampling resistor of cathode output end connection
The anode connection of pole pipe, the negative electrode of diode and one end of controlling switch connect, the tested contact of other end connection of controlling switch
The anode of device；Both ends, output end and the microprocessor that the input of signal acquisition circuit is connected in parallel in sampling resistor connect；It is micro-
Processor is connected with power circuit, communicating circuit, output control circuit respectively；The output end and controlling switch of output control circuit
Control terminal connection.
2. high voltage connector state micro-current injection detection circuit according to claim 1, it is characterised in that：Power circuit
Output voltage be 5V.
3. high voltage connector state micro-current injection detection circuit according to claim 1, it is characterised in that：The communication
Circuit uses CAN communication circuit.
4. based on the detecting system of high voltage connector state micro-current injection detection circuit described in claim 1, including power supply, height
Power distribution cabinet, electrical equipment are pressed, the positive pole of electrical equipment is connected with positive source, negative pole and power cathode connect, it is characterised in that：
Connect total positive contactor, connect between the negative pole and power cathode of electrical equipment always between the positive pole of electrical equipment and positive source
Negative contactor, precharge group and preliminary filling contactor are parallel to the both ends of total positive contactor after being connected in series, total to bear the two of contactor
End is connected in parallel high voltage connector state micro-current injection detection circuit, total positive contactor, always bears contactor, be precharge group, pre-
Fill contactor, high voltage connector state micro-current injection detection circuit may be contained within high voltage power distributing cabinet.
5. detecting system according to claim 4, it is characterised in that：The electrical equipment includes the mechanical, electrical air-conditioning of electricity, electricity turns
To.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720033789.XU CN206710558U (en) | 2017-01-11 | 2017-01-11 | High voltage connector state micro-current injection detection circuit and detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720033789.XU CN206710558U (en) | 2017-01-11 | 2017-01-11 | High voltage connector state micro-current injection detection circuit and detecting system |
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| CN206710558U true CN206710558U (en) | 2017-12-05 |
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| CN201720033789.XU Active CN206710558U (en) | 2017-01-11 | 2017-01-11 | High voltage connector state micro-current injection detection circuit and detecting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108205109A (en) * | 2018-01-25 | 2018-06-26 | 成都雅骏新能源汽车科技股份有限公司 | The pouring-in high-tension battery packet relay on-off diagnostic circuit of signal |
| CN108303641A (en) * | 2017-01-11 | 2018-07-20 | 上海埃而生电气股份有限公司 | High voltage connector state micro-current injects detection circuit and detection method and system |
-
2017
- 2017-01-11 CN CN201720033789.XU patent/CN206710558U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303641A (en) * | 2017-01-11 | 2018-07-20 | 上海埃而生电气股份有限公司 | High voltage connector state micro-current injects detection circuit and detection method and system |
| CN108205109A (en) * | 2018-01-25 | 2018-06-26 | 成都雅骏新能源汽车科技股份有限公司 | The pouring-in high-tension battery packet relay on-off diagnostic circuit of signal |
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