CN108061853A - The power switch contact adhesion detecting system and method for electric vehicle DC charging - Google Patents
The power switch contact adhesion detecting system and method for electric vehicle DC charging Download PDFInfo
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- CN108061853A CN108061853A CN201711158050.2A CN201711158050A CN108061853A CN 108061853 A CN108061853 A CN 108061853A CN 201711158050 A CN201711158050 A CN 201711158050A CN 108061853 A CN108061853 A CN 108061853A
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- power switch
- charging
- electric vehicle
- contact adhesion
- module
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses the power switch contact adhesion detecting systems and method of a kind of electric vehicle DC charging, system includes monitoring module and control module, anode power switch and cathode power switch ends in the both ends difference connecting electric automobile DC charging major loop of control module, main circuit switching power upper and lower end voltage analog magnitude is detected during acquisition；Monitoring module connects control module by communication link wiring, receives the acquisition information of control module, by the way that two power switch is controlled to be closed, disconnect successively, according to the voltage analog magnitude of feedback, judges whether that power switch contact adhesion situation occurs.
Description
Technical field
The present invention relates to the power switch contact adhesion detecting systems and method of a kind of electric vehicle DC charging.
Background technology
In electric vehicle charging industry, since charging voltage is higher, electric current is larger, contactor constant power switch connect or
Moment is disconnected, main contacts adhesion, serious threat to the person and the safety of equipment easily occurs.National standard GB/T 18487.1-2015
It is explicitly pointed out in 7.1, " under pattern 4, electric vehicle should possess charge circuit contactor adhesion monitoring and alarm function, power supply are set
It is standby to possess current supply circuit contactor adhesion monitoring and alarm function.”.
Electric vehicle charging row portion in the industry at present, there are mainly two types of adhesion detection methods：One kind is to use power switch certainly
The auxiliary contact or microswitch of body are detected, but optional power switch model is less, and accuracy in detection is relatively low.It is another
Method is that additional other detection circuits are detected, and this method accuracy of detection is high, but cost is higher, external cabling is relatively multiple
It is miscellaneous.
Chinese patent ZL201110274981.5 proposes a kind of DC power-supply system contactor adhesion detection device, method
And electric vehicle.This adhesion detection device selfcapacity group has regular hour delay, different electricity in charge and discharge process
Pressing needs the time being delayed different during the equipment voltage detecting of grade, cause simulation detection values during batch production that can generate
Certain error, so as to influence the accuracy of detection.
The content of the invention
The present invention is to solve the above-mentioned problems, it is proposed that a kind of power switch contact adhesion inspection of electric vehicle DC charging
Examining system and method, the present invention can avoid due to power switch contact adhesion equipment damage or personnel being caused to injure, so as to
Improve the stability and reliability of direct-current charging post and system.
To achieve these goals, the present invention adopts the following technical scheme that：
The power switch contact adhesion detecting system of a kind of electric vehicle DC charging, including monitoring module and observing and controlling mould
Block, wherein：The anode of major loop and cathode power switch upper and lower end voltage analog magnitude are detected during the control module acquisition,
The monitoring module receives the acquisition information of control module, and two power switch of control are closed, disconnect successively, according to the electricity of feedback
Analog value is pressed, judges whether that power switch contact adhesion occurs.
Further, monitoring module one end connection control module, the other end connect direct current by communication link wiring and fill
Multiple charging modules of electricity control each charging module to start, stop, and receive the real time data that charging module uploads.
Further, by a power switch being closed in major loop, two power switch of detection sentence respectively opening,
Off state and main circuit switching power both end voltage situation judge whether power switch closes according to power switch auxiliary contact
It closes, while detects the analog value of main circuit switching power both end voltage.
Further, the monitoring module simultaneously turns off another power switch, according to work(by being closed a certain power switch
Whether rate switch opening, off state and the voltage value at two-way power switch main contacts both ends, judge the power switch being closed
Controllably, not closed power switch main contacts whether adhesion.
Further, the control module voltage detecting circuit, including resistor voltage divider circuit, the reference voltage being sequentially connected
Circuit, isolation circuit and analog to digital conversion circuit are improved incoming level by level shift, realize that positive and negative bi-directional voltage is adopted
Collection.
Further, the communication link wiring is CAN bus.
Further, the system is worked in after electric vehicle DC charging system startup charging module, Insulation monitoring
It completes before.
The electric vehicle DC charging major loop includes DC charging rifle, positive and negative charging bus and charging module, described
Charging module connects positive and negative charging bus, and the DC charging rifle is switched by anode power, the connection of direct current current divider is positive charges
Bus, DC charging rifle is switched by cathode power, the negative charging bus of DC fuse connection, is set between positive and negative charging bus
There is bleed-off circuit.
Further, after the charging module plays machine, in adhesion detection process, control module is according to power switch main contacts
The voltage value at both ends, judge in major loop power line and gathering line whether reversal connection, if detecting the situation of reversal connection, monitoring
Troubleshooting is alarmed or carried out to module.
The power switch contact adhesion detection method of electric vehicle DC charging, comprises the following steps：
(1) start charging module, determine charging module rated voltage；
(2) terminal voltage value under power switch is detected, if lower terminal voltage, which is zero or lower terminal voltage, is not equal to rated voltage, is
Otherwise system alarm or troubleshooting, are closed anode power switch；
(3) terminal voltage value on power switch is detected, if there is voltage and upper terminal voltage value is identical with lower terminal voltage value, then sentences
Disconnected cathode power switch contact adhesion, system alarm or troubleshooting；If upper terminal voltage value is zero, disconnects anode power and open
It closes, is closed cathode power switch；
(4) the upper terminal voltage value of power switch is detected again, if there is voltage and upper terminal voltage value and lower terminal voltage value phase
Together, then anode power switch contact adhesion, system alarm or troubleshooting are judged；If upper terminal voltage value is zero, it is closed again
Anode power switchs, and completes adhesion detection.
Adhesion detection is completed, and carries out Insulation monitoring.
After charging module plays machine, in adhesion detection process, voltage value of the control module according to power switch main contacts both ends,
Judge line in major loop whether reversal connection.When gathering line anode is connected to power line cathode, gathering line cathode is connected to power line
During anode, system detectio voltage is negative value, then is determined with the situation of reversal connection, monitoring module alarm or progress troubleshooting.
Compared with prior art, beneficial effects of the present invention are：
(1) present invention is proposed for the intrinsic hardware resource of electric vehicle direct-current charging post, is supported without other external circuits,
Synthesis is at low cost；
(2) present invention is nested in direct-current charging post Insulation monitoring flow, compared with traditional adhesion detection method, operation
Simply, it is reliable and stable, suitable for the equipment of different voltages grade, it is widely used；
(3) control module mentioned in the present invention, the acquisition mode being electrically isolated using electric resistance partial pressure, power, passes through level
Displacement improves incoming level, realizes the two-way acquisition of DC voltage, and broad quantum, precision are high, and acquisition system is highly reliable；
(4) present invention, suitable for the power switch of various capacity models, is not only suitable for from the limitation of power switch species
Straight-flow system, and suitable for AC system, while it is suitable for the electric vehicle of supplied by AC/DC electricity again.
Description of the drawings
The Figure of description for forming the part of the present invention is used for providing a further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation do not constitute improper limitations of the present invention for explaining the present invention.
Fig. 1 is schematic structural view of the invention；
Fig. 2 is the telemetry circuit structure chart of the present invention；
Fig. 3 is the testing process schematic diagram of the present invention.
Specific embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the present invention.It is unless another
It indicates, all technical and scientific terms used herein has usual with general technical staff of the technical field of the invention
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to exemplary embodiments of the present invention.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " bag
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
As background technology is introduced, adhesion detection device selfcapacity group exists in the prior art in charge and discharge process
In have regular hour delay, need during the equipment voltage detecting of different voltages grade the time being delayed different, cause
Detection values are simulated during batch production can generate certain error, so as to influence the deficiency of the accuracy of detection, adhesion detection dress
It puts selfcapacity group and regular hour delay is had in charge and discharge process, when equipment voltage detecting of different voltages grade needs
The time of delay is different, causes simulation detection values during batch production that can generate certain error, so as to influence detection
Accuracy.
A kind of exemplary embodiment, as shown in Figure 1, a kind of power switch contact adhesion detection method, with reference to electric vehicle
Direct-current charging post hardware configuration and workflow propose, the main monitoring module relied in charging pile system, control module, multiple
Charging module and the devices such as the anode power switch QC1 being connected in major loop and cathode power switch QC2 are completed.
A kind of power switch contact adhesion detection method, monitoring module are connected by CAN bus with control module, issue life
Order control whole device inside related switch is switched on and off, while receives the analog quantity of control module upload, switching value letter
Breath.Monitoring module is connected by another way CAN bus with the in vivo multiple charging modules of charger screen simultaneously, transmitting order to lower levels control
Charging module starts, stops, and receives the real time data that charging module uploads.
Direct-current charging post needs to carry out Insulation monitoring before charging is started.The present invention system start charging module it
Afterwards, completed before Insulation monitoring.By a power switch QC1 being closed in major loop, two power switch QC1, QC2 are detected
Opening, off state and main circuit switching power both end voltage situation, judge power switch according to power switch auxiliary contact
Whether it is closed, while detects main circuit switching power both end voltage V1, V2 physical simulation magnitude.Open and close are beaten according to power switch
Disconnected state and the voltage value at two-way power switch main contacts both ends, can determine whether the power switch QC1 being closed is controllable, patent
The power switch QC2 main contacts of conjunction whether adhesion.It is consistent with the above method, QC1 is disconnected, is closed QC2, can determine whether the power being closed
Whether controllable switch QC2, the power switch QC1 of disconnection whether adhesion.
As shown in Fig. 2, control module voltage detecting circuit, mainly including resistor voltage divider circuit, reference voltage circuit, strong
Electricity, light current isolation circuit and analog to digital conversion circuit.Incoming level is improved by level shift, realizes positive and negative bi-directional voltage
Acquisition function, broad quantum, precision are high.Zeroing function is realized by Software Coding, and does not increase the complexity of Acquisition Circuit, circuit
It is simple for structure, it is easy to implement.
After charging module plays machine, in adhesion detection process, control module can be according to the voltage at power switch main contacts both ends
Value, judge in major loop power line and gathering line whether reversal connection, if detecting the situation of reversal connection, then monitoring module report
Alert or progress troubleshooting.Effectively raise the Stability and dependability of adhesion detecting system.
As shown in figure 3, a kind of power switch contact adhesion detection method, specifically includes following steps：
(1) system, which starts, charges,
(2) monitoring module transmitting order to lower levels, starts charging module, and voltage value is charging module rated voltage V.
(3) control module detection V1 voltages, if V1=0, that is, no-voltage or V1 ≠ V, system alarm or troubleshooting；Such as
Fruit has voltage and V1=V, QC1 are closed.
(4) control module detection V2 voltage values, if there is voltage and V2=V1, then think that power switch QC2 contacts are glued
Even, system alarm or troubleshooting；If V2=0, that is, no-voltage, then disconnect QC1, be closed QC2.
(5) module detects V2 voltage values again, if there is voltage and V2=V1, then thinks that power switch QC1 contacts are glued
Even, system alarm or troubleshooting；If V2=0, that is, no-voltage, is closed QC1 again.
(6) adhesion detection is completed, and system carries out Insulation monitoring.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of power switch contact adhesion detecting system of electric vehicle DC charging, it is characterized in that：Including monitoring module and
Control module detects the anode of major loop and cathode power switch upper and lower end voltage analog magnitude when the control module gathers,
The monitoring module receives the acquisition information of control module, and two power switch of control are closed, disconnect successively, according to the electricity of feedback
Analog value is pressed, judges whether that power switch contact adhesion occurs.
2. a kind of power switch contact adhesion detecting system of electric vehicle DC charging as described in claim 1, feature
It is：Described monitoring module one end connects control module, and the other end connects multiple charging moulds of DC charging by communication link wiring
Block controls each charging module to start, stop, and receives the real time data that charging module uploads.
3. a kind of power switch contact adhesion detecting system of electric vehicle DC charging as described in claim 1, feature
It is：By a power switch being closed in major loop, two power switch of detection sentence opening, off state and master respectively
Power loop switch ends voltage condition judges whether power switch is closed according to power switch auxiliary contact, while detects master
The analog value of power loop switch ends voltage.
4. a kind of power switch contact adhesion detecting system of electric vehicle DC charging as described in claim 1, feature
It is：The monitoring module simultaneously turns off another power switch, open and close is played according to power switch by being closed a certain power switch
Disconnected state and the voltage value at two-way power switch main contacts both ends, judge whether the power switch being closed is controllable, not closed
Power switch main contacts whether adhesion.
5. a kind of power switch contact adhesion detecting system of electric vehicle DC charging as described in claim 1, feature
It is：The control module voltage detecting circuit, including the resistor voltage divider circuit, reference voltage circuit, isolation circuit being sequentially connected
And analog to digital conversion circuit, incoming level is improved by level shift, realizes positive and negative bi-directional voltage acquisition.
6. a kind of power switch contact adhesion detecting system of electric vehicle DC charging as claimed in claim 2, feature
It is：The communication link wiring is CAN bus.
7. a kind of power switch contact adhesion detecting system of electric vehicle DC charging as described in claim 1, feature
It is：The system is worked in after electric vehicle DC charging system startup charging module, is completed before Insulation monitoring.
8. a kind of power switch contact adhesion detecting system of electric vehicle DC charging as described in claim 1, feature
It is：The electric vehicle DC charging major loop includes DC charging rifle, positive and negative charging bus and charging module, the charging mould
Block connects positive and negative charging bus, and the DC charging rifle is switched by anode power, direct current current divider connects positive charging bus, directly
Current charge rifle is switched by cathode power, the negative charging bus of DC fuse connection, is provided with and is released between positive and negative charging bus
Circuit.
9. a kind of power switch contact adhesion detecting system of electric vehicle DC charging as claimed in claim 8, feature
It is：After the charging module plays machine, in adhesion detection process, voltage value of the control module according to power switch main contacts both ends,
Judge in major loop power line and gathering line whether reversal connection, if detecting the situation of reversal connection, monitoring module alarm or into
Row troubleshooting.
10. the power switch contact adhesion detection method of electric vehicle DC charging, it is characterized in that：Comprise the following steps：
(1) start charging module, determine charging module rated voltage；
(2) detect terminal voltage value under power switch, if lower terminal voltage is zero or lower terminal voltage not equal to rated voltage, alarm or
Troubleshooting；Otherwise, it is closed anode power switch；
(3) terminal voltage value on power switch is detected, if there is voltage and upper terminal voltage value is identical with lower terminal voltage value, then judges the moon
Pole power switch contact adhesion, alarm or troubleshooting；If upper terminal voltage value is zero, anode power switch is disconnected, is closed
Cathode power switchs；
(4) the upper terminal voltage value of power switch is detected again, and if there is voltage and upper terminal voltage value is identical with lower terminal voltage value, then
Judge anode power switch contact adhesion, alarm or troubleshooting；If upper terminal voltage value is zero, anode power is closed again and is opened
It closes, completes adhesion detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711158050.2A CN108061853A (en) | 2017-11-20 | 2017-11-20 | The power switch contact adhesion detecting system and method for electric vehicle DC charging |
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| CN201711158050.2A CN108061853A (en) | 2017-11-20 | 2017-11-20 | The power switch contact adhesion detecting system and method for electric vehicle DC charging |
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Cited By (7)
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| CN109444507A (en) * | 2018-10-31 | 2019-03-08 | 山东鲁能智能技术有限公司 | A kind of electric car direct-current charging post charging voltage Acquisition Circuit, Insulation Inspection System and method |
| CN109870646A (en) * | 2019-01-21 | 2019-06-11 | 西北工业大学 | A kind of portable device for fast detecting of uplock microswitch |
| CN110456265A (en) * | 2019-08-16 | 2019-11-15 | 武汉合康智能电气有限公司 | The detection method of relay in a kind of charging pile |
| CN110620019A (en) * | 2018-06-20 | 2019-12-27 | 森萨塔科技（常州）有限公司 | Hybrid DC contactor and online diagnosis system thereof |
| CN110690721A (en) * | 2019-08-30 | 2020-01-14 | 阳光电源股份有限公司 | Starting-up self-detection method of energy storage system and application device and system thereof |
| CN113302505A (en) * | 2020-07-31 | 2021-08-24 | 华为技术有限公司 | Switch state detection circuit, method and device |
| CN114200297A (en) * | 2021-12-14 | 2022-03-18 | 睿信汽车电器（荆州）有限公司 | Switch contact adhesion sensitivity quantitative measurement system and method |
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