CN113391199A - Method for detecting adhesion of main contact of direct-current charging pile high-voltage relay - Google Patents
Method for detecting adhesion of main contact of direct-current charging pile high-voltage relay Download PDFInfo
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- CN113391199A CN113391199A CN202110597953.0A CN202110597953A CN113391199A CN 113391199 A CN113391199 A CN 113391199A CN 202110597953 A CN202110597953 A CN 202110597953A CN 113391199 A CN113391199 A CN 113391199A
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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
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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Abstract
The invention relates to a method for detecting adhesion of main contact points of a high-voltage relay of a direct-current charging pile, which comprises the steps of closing two switch relays on an auxiliary power supply and conducting the auxiliary power supply after the direct-current charging pile is adjusted to a standby non-charging state, judging whether a voltage difference value corresponding to two rear-end detection points of the high-voltage relay and the duration of the voltage difference value once the voltage difference value between the two rear-end detection points is equal to an output power value of the auxiliary power supply and the voltage difference value reaches a preset duration, and judging that a main contactor K1 of the high-voltage relay is in an adhesion state at the moment, so that accurate detection of the adhesion state of a main contactor K1 of the lost high-voltage relay can be achieved by fully utilizing existing hardware on the basis of not additionally adding hardware, the detection cost is reduced, and the detection efficiency is improved.
Description
Technical Field
The invention relates to the field of direct-current charging piles, in particular to a method for detecting adhesion of a main contact of a high-voltage relay of a direct-current charging pile.
Background
The direct current charging pile has become an important product form in the field of charging piles. Referring to fig. 1 and 2, the existing direct-current charging pile comprises an off-board charger controller MCU2, a bleeder resistor RX, an FU fuse, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a switch S, a high-voltage relay main contactor K1 (or called a high-voltage relay main contact point K1), a high-voltage relay auxiliary contactor K2 (or called a high-voltage relay auxiliary contact point K2), a low-voltage auxiliary power supply, a contactor K3, a contactor K4, a charging loop contactor K5 and a charging loop contactor K6. The off-board charger controller MCU2 is located on the off-board charger 1, the off-board charger 1 is provided with an equipment ground terminal (or called a vehicle pile ground) PE2, the off-board charger 1 is connected with the vehicle 3 to be charged through a vehicle interface 2, the vehicle 3 to be charged is provided with a battery pack B1 and a vehicle controller MCU1, the vehicle controller MCU1 is integrated in a battery management system of the vehicle 3 to be charged, and the vehicle controller MCU1 is further connected with a vehicle ground terminal PE 1. The main contactor K1 of the high-voltage relay is a high-voltage loop contact and is responsible for large current to flow through a loop; the auxiliary contactor K2 of the high-voltage relay is a signal return contact for detecting the closing of the high-voltage relay. The system comprises signal lines S + and S-, CC1 and CC2, a connection confirmation signal, a voltage of +12V, a power line anode and a power line cathode, an auxiliary power line A + and an auxiliary power line A-respectively, a diode D1, and different power modules respectively represented by AC/DC, DC/DC and T, wherein the signal lines S + and S-are vehicle-pile communication signal lines respectively; v + and V-in fig. 2 represent the high voltage relay control coils.
Referring to fig. 3, a low-voltage auxiliary power supply (hereinafter, collectively referred to as an auxiliary power supply B2) is provided with a switch relay K7 and a switch relay K8, the high-voltage relay is provided with a high-voltage relay rear end detection point T1 and a high-voltage relay rear end detection point T2, and the auxiliary power supply and two rear end detection points (T1 and T2) of the high-voltage relay are connected through the switch relay K7, the switch relay K8, a high-voltage relay main contactor K1 and a high-voltage relay auxiliary contactor K2. The resistor R2 and the resistor R3 are mounted on the vehicle plug, and the resistor R4 is mounted on the vehicle receptacle. The switch S is an internal normally closed switch of the vehicle plug, and is closed after the vehicle plug is completely connected with the vehicle socket. In the whole charging process of a vehicle, the off-board charger controller can monitor a high-voltage relay main contactor K1, a high-voltage relay auxiliary contactor K2, a contactor K3 and a contactor K4; the vehicle controller can monitor the status of charge circuit contactor K5 and charge circuit contactor K6 and control the turn-on and turn-off of charge circuit contactors K5 and K6. Wherein UP represents a 220V auxiliary power supply, CCU represents a charging controller main control unit, and XT represents a charging interface.
When the direct current charging pile is normally started, firstly, an auxiliary power supply is closed to supply power, normal communication with a vehicle controller is realized, a high-voltage relay main contactor K1 and a high-voltage relay auxiliary contactor K2 are closed, an AC/DC-DC/DC charging module of an off-board charger is controlled to start, voltage and current are output according to the requirement of a vehicle, and insulation detection is carried out; after the insulation detection is finished, the high-voltage relay main contactor K1 and the high-voltage relay auxiliary contactor K2 are disconnected, at the moment, the vehicle closes the charging circuit contactor K5 and the charging circuit contactor K6, and the pre-charging stage is started. In the pre-charging stage, firstly, starting an AC/DC-DC/DC charging module of the off-board charger, and when voltages on two sides of a high-voltage relay main contactor K1 and a high-voltage relay auxiliary contactor K2 meet a closing condition, closing the high-voltage relay main contactor K1 and the high-voltage relay auxiliary contactor K2 and entering the charging stage; in the shutdown stage, the AC/DC-DC/DC charging module of the off-board charger is firstly closed, and when the current flowing through the high-voltage relay main contactor K1 and the high-voltage relay auxiliary contactor K2 is zero, the main contactor K1 and the auxiliary contactor K2 of the high-voltage relay are disconnected.
In the process of detecting the fault of the high-voltage relay of the direct-current charging pile, whether the fault of the high-voltage relay is rejected or mistakenly operated can be detected and judged only according to the state returned by an auxiliary contactor of the high-voltage relay. However, it is impossible to accurately detect whether the main contactor K1 of the high-voltage relay is stuck.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for detecting adhesion of a main contact of a high-voltage relay of a direct-current charging pile in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for detecting the adhesion of the main contact point of the direct-current charging pile high-voltage relay is characterized by comprising the following steps of:
step 4, judging and processing according to the detected voltage difference value and the duration thereof:
when the voltage difference value is equivalent to the voltage value of the auxiliary power supply and the duration of the voltage difference value exceeds the preset duration, judging that the main contactor K1 of the high-voltage relay is in an adhesion state; otherwise, the high-voltage relay main contactor K1 is not in the adhesion state.
The improvement, in the main contact adhesion detection method of direct current charging stake high voltage relay, still include between step 2 and step 3: the high-voltage relay auxiliary contactor K2 is closed.
Further improved, in the method for detecting the adhesion of the main contact point of the direct current charging pile high-voltage relay, after the step 4 of determining that the high-voltage relay main contactor K1 is in an adhesion state, the method further comprises the following steps: the switch relay K7 and the switch relay K8 on the auxiliary power supply are turned off.
In order to timely respond when the high-voltage relay main contactor K1 is adhered, in the method for detecting the adhesion of the main contact point of the high-voltage relay of the direct-current charging pile, after the step 4 of judging that the high-voltage relay main contactor K1 is in an adhesion state, the method further comprises the following steps: and performing alarm prompt operation when the high-voltage relay main contactor K1 is in an adhesion state.
Further, in the method for detecting the adhesion of the main contact of the direct current charging pile high-voltage relay, the voltage output value of the auxiliary power supply is 12V.
Still further, in the method for detecting adhesion of the main contact of the direct-current charging pile high-voltage relay, the preset time is 1 s.
In the method for detecting the adhesion of the main contact point of the direct-current charging pile high-voltage relay, the withstand voltage value of the switch relay K7 and the withstand voltage value of the switch relay K8 on the auxiliary power supply both exceed 1000V.
In a further improvement, in the method for detecting the adhesion of the main contact point of the direct-current charging pile high-voltage relay, the voltage withstanding value of the high-voltage relay main contactor K1 and the voltage withstanding value of the high-voltage relay auxiliary contactor K2 both exceed 1000V.
In order to detect the voltage difference between the two rear-end detection points of the high-voltage relay in time to judge the adhesion state of the main contactor K1 of the high-voltage relay, in step 3, the voltage difference between the rear-end detection point T1 of the high-voltage relay and the rear-end detection point T2 of the high-voltage relay and the duration of the voltage difference are detected according to a preset time interval.
Further, in the method for detecting the adhesion of the main contact of the direct current charging pile high-voltage relay, the preset time interval is 12 hours.
Compared with the prior art, the invention has the advantages that: according to the invention, after the direct current charging pile is adjusted to a standby non-charging state, two switch relays on the auxiliary power supply are closed, the auxiliary power supply is conducted, and once the voltage difference value between two rear-end detection points of the high-voltage relay is determined to be equivalent to the output power supply value of the auxiliary power supply and the voltage difference value maintaining time reaches the preset time length, the high-voltage relay main contactor K1 is judged to be in an adhesion state, so that the adhesion state of the high-voltage relay main contactor K1 can be accurately detected by fully utilizing the existing hardware in the direct current charging pile on the basis of not additionally adding the hardware, the detection cost is reduced, and the detection efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of a dc charging pile control guidance circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a high-voltage output relay of the DC charging pile;
FIG. 3 is a schematic diagram of the connection between an auxiliary power supply and a high-voltage output relay in the DC charging pile;
fig. 4 is a schematic flow chart of a method for detecting adhesion of a main contact of a dc charging pile high-voltage relay according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The embodiment provides a method for detecting adhesion of a main contact point of a direct-current charging pile high-voltage relay. Specifically, referring to fig. 1, the method for detecting adhesion of a main contact of a dc charging pile high-voltage relay according to the embodiment includes the following steps:
step 4, judging and processing according to the detected voltage difference value and the duration thereof:
when the voltage difference value is equal to the voltage value of the auxiliary power supply B2, namely the detected voltage difference value is also 12V, and the duration of the voltage difference value exceeds the preset duration, determining that the main contactor K1 of the high-voltage relay is in an adhesion state; otherwise, the high-voltage relay main contactor K1 is not in the adhesion state. Wherein, the preset time length is set to be 1s, and the withstand voltage value of the high-voltage relay main contactor K1 and the withstand voltage value of the high-voltage relay auxiliary contactor K2 both exceed 1000V.
The main contact sticking detection method of this embodiment also opens the switch relay K7 and the switch relay K8 on the auxiliary power supply B2 after the high-voltage relay main contactor K1 has been determined to be in the stuck state.
Of course, as a measure for improvement, in the method for detecting adhesion of main contact point of dc charging post high-voltage relay in this embodiment, the high-voltage relay auxiliary contactor K2 may be closed between step 2 and step 3. Therefore, the steps 3 and 4 are executed again, and the adhesion detection for the high-voltage relay main contactor K1 can be realized. After the high-voltage relay main contactor K1 is judged to be in the adhesion state, an alarm prompt operation is also made when the high-voltage relay main contactor K1 is in the adhesion state.
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for detecting the adhesion of the main contact point of the direct-current charging pile high-voltage relay is characterized by comprising the following steps of:
step 1, adjusting the state of a direct current charging pile to a standby non-charging state;
step 2, closing a switch relay K7 and a switch relay K8 on the auxiliary power supply, and conducting the auxiliary power supply;
step 3, detecting a voltage difference value between a detection point T1 at the rear end of the high-voltage relay and a detection point T2 at the rear end of the high-voltage relay and the duration of the voltage difference value;
step 4, judging and processing according to the detected voltage difference value and the duration thereof:
when the voltage difference value is equivalent to the voltage value of the auxiliary power supply and the duration of the voltage difference value exceeds the preset duration, judging that the main contactor K1 of the high-voltage relay is in an adhesion state; otherwise, the high-voltage relay main contactor K1 is not in the adhesion state.
2. The method for detecting the adhesion of the main contact point of the direct current charging pile high-voltage relay according to claim 1, further comprising the following steps between the step 2 and the step 3: the high-voltage relay auxiliary contactor K2 is closed.
3. The method for detecting the adhesion of the main contact point of the direct-current charging pile high-voltage relay according to claim 1 or 2, wherein after the step 4 of determining that the high-voltage relay main contactor K1 is in an adhesion state, the method further comprises the following steps: the switch relay K7 and the switch relay K8 on the auxiliary power supply are turned off.
4. The method for detecting the adhesion of the main contact point of the direct-current charging pile high-voltage relay according to claim 3, wherein after the step 4 of determining that the high-voltage relay main contactor K1 is in the adhesion state, the method further comprises the following steps: and performing alarm prompt operation when the high-voltage relay main contactor K1 is in an adhesion state.
5. The method for detecting the adhesion of the main contact of the direct current charging pile high-voltage relay according to claim 1, wherein the voltage output value of the auxiliary power supply is 12V.
6. The method for detecting the adhesion of the main contact point of the direct-current charging pile high-voltage relay according to claim 5, wherein the preset time is 1 s.
7. The method for detecting the adhesion of the main contact point of the DC charging pile high-voltage relay according to claim 1, wherein the withstand voltage value of a switch relay K7 and the withstand voltage value of a switch relay K8 on the auxiliary power supply both exceed 1000V.
8. The method for detecting the adhesion of the main contact point of the DC charging pile high-voltage relay according to claim 7, wherein the voltage withstanding value of the high-voltage relay main contactor K1 and the voltage withstanding value of the high-voltage relay auxiliary contactor K2 both exceed 1000V.
9. The method for detecting adhesion of main contact points of a dc charging post high voltage relay according to claim 7, wherein in step 3, a voltage difference between the high voltage relay rear end detection point T1 and the high voltage relay rear end detection point T2 and a duration of the voltage difference are detected at predetermined time intervals.
10. The method for detecting adhesion of a main contact of a dc charging post high voltage relay according to claim 9, wherein the predetermined time interval is 12 hours.
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| CN202110597953.0A CN113391199A (en) | 2021-05-31 | 2021-05-31 | Method for detecting adhesion of main contact of direct-current charging pile high-voltage relay |
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| CN202110597953.0A CN113391199A (en) | 2021-05-31 | 2021-05-31 | Method for detecting adhesion of main contact of direct-current charging pile high-voltage relay |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113839445A (en) * | 2021-10-14 | 2021-12-24 | 阳光电源股份有限公司 | Control method and control device of direct-current power supply and direct-current power supply |
| CN117169778A (en) * | 2023-11-02 | 2023-12-05 | 深圳市国威通电子技术有限公司 | New energy automobile high-voltage short circuit detection method and system |
| WO2024207925A1 (en) * | 2023-04-04 | 2024-10-10 | 万帮数字能源股份有限公司 | Direct-current charging pile, and contactor adhesion detection method and apparatus therefor |
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| CN108254682A (en) * | 2017-12-28 | 2018-07-06 | 长园深瑞继保自动化有限公司 | The method of discrimination of direct-current charging post output contactor adhesion fault |
| CN110824354A (en) * | 2019-12-17 | 2020-02-21 | 山东谦恒电子科技有限公司 | Device and method for detecting adhesion of high-voltage relay of pure electric vehicle without floating voltage |
| CN112373320A (en) * | 2020-12-04 | 2021-02-19 | 东风汽车股份有限公司 | BMS-based electric vehicle charging power-on control system and control method thereof |
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2021
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Patent Citations (4)
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| CN103022959A (en) * | 2013-01-11 | 2013-04-03 | 南阳防爆电气研究所有限公司 | Method and device for adhesion detection of main contact of alternating-current contactor |
| CN108254682A (en) * | 2017-12-28 | 2018-07-06 | 长园深瑞继保自动化有限公司 | The method of discrimination of direct-current charging post output contactor adhesion fault |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839445A (en) * | 2021-10-14 | 2021-12-24 | 阳光电源股份有限公司 | Control method and control device of direct-current power supply and direct-current power supply |
| CN113839445B (en) * | 2021-10-14 | 2024-02-09 | 阳光电源股份有限公司 | Control method and control device of direct current power supply and direct current power supply |
| WO2024207925A1 (en) * | 2023-04-04 | 2024-10-10 | 万帮数字能源股份有限公司 | Direct-current charging pile, and contactor adhesion detection method and apparatus therefor |
| CN117169778A (en) * | 2023-11-02 | 2023-12-05 | 深圳市国威通电子技术有限公司 | New energy automobile high-voltage short circuit detection method and system |
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Application publication date: 20210914 |