CN113022312B - High-voltage power-on control method, high-voltage power-on circuit and electric vehicle - Google Patents
High-voltage power-on control method, high-voltage power-on circuit and electric vehicle Download PDFInfo
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- CN113022312B CN113022312B CN202110236202.6A CN202110236202A CN113022312B CN 113022312 B CN113022312 B CN 113022312B CN 202110236202 A CN202110236202 A CN 202110236202A CN 113022312 B CN113022312 B CN 113022312B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The application discloses a control method, high-voltage power-on circuit and electric vehicle of high-voltage power-on, and the control method includes: when the high-voltage power is applied, power is supplied to the positive electrode relay, the negative electrode relay and the pre-charging relay, and the positive electrode relay, the negative electrode relay and the pre-charging relay are controlled to be disconnected; detecting whether the positive relay has a fault or not; if the positive relay fails, the pre-charging relay is controlled to be closed, and whether the negative relay fails or not is judged; if the negative relay does not have a fault, controlling the negative relay to be closed so as to precharge and time the high-voltage device; and in the preset time period, if the voltage at the two ends of the high-voltage device is not less than the preset voltage, controlling the pre-charging relay to be opened and controlling the positive relay to be closed so as to finish the high-voltage power-on of the high-voltage device. The control logic of the embodiment of the application can enable the electric vehicle to carry out safe high-voltage pre-charging, ensure the reliability and safety of high-voltage power-on of the electric vehicle and avoid damaging high-voltage devices.
Description
Technical Field
The application relates to the field of vehicle electrification, in particular to a control method for high-voltage electrification, a high-voltage electrification circuit and an electric vehicle.
Background
In general, when an electric vehicle is started or charged, it is necessary to charge an internal high-voltage device on the vehicle, that is, to load the high-voltage device with the high voltage of the power battery. In general, considering that the vehicle-mounted high-voltage device mostly belongs to capacitive loads, if the high voltage of the power battery is directly loaded on the device, the device is easily damaged or even related devices of the power battery are burnt, so that the high voltage of the power battery needs to be slowly loaded on the vehicle-mounted high-voltage device when the high voltage is electrified.
However, in practical application, when the high voltage of the power battery is slowly loaded on the vehicle-mounted high voltage device, the risk of damaging the vehicle-mounted high voltage device still exists, and an effective scheme for solving the technical problem is still lacking at present.
Disclosure of Invention
The embodiment of the application provides a control method for high-voltage power-on, a high-voltage power-on circuit and an electric vehicle, which are used for solving the problem that a vehicle-mounted high-voltage device in the electric vehicle is easy to damage when the vehicle-mounted high-voltage device is electrified at present.
In order to solve the technical problems, the embodiment of the application is realized as follows:
in a first aspect, a control method for high-voltage power-on is provided, and the control method is applied to a high-voltage power-on circuit, where the high-voltage power-on circuit includes: the control method comprises the following steps that a positive relay with two ends respectively connected with a positive electrode of a power battery and a positive electrode of a high-voltage device, a negative relay with two ends respectively connected with a negative electrode of the power battery and a negative electrode of the high-voltage device, and a pre-charging relay and a pre-charging resistor which are connected in series are connected in parallel at two ends of the positive relay, wherein the positive relay, the negative relay and the two ends of the pre-charging relay are connected with a relay control module, and the control method comprises the following steps:
under the condition of high-voltage power-on of the high-voltage device, providing power for the positive electrode relay, the negative electrode relay and the pre-charging relay, and controlling the disconnection of the positive electrode relay, the negative electrode relay and the pre-charging relay;
detecting whether the positive relay has a fault or not;
if the positive relay does not have a fault, controlling the pre-charging relay to be closed, and judging whether the negative relay has a fault or not;
if the negative relay does not have a fault, controlling the negative relay to be closed so as to precharge and time the high-voltage device;
And if the voltage at the two ends of the high-voltage device is not smaller than the preset voltage within the preset time, controlling the pre-charging relay to be opened and controlling the positive relay to be closed so as to finish the high-voltage power-on of the high-voltage device.
In a second aspect, a high voltage power-on circuit is provided, including positive relay, negative relay, pre-charge resistor, power battery, high voltage device and relay control module, wherein:
the first end of the positive relay is connected with the positive electrode of the power battery, and the second end of the positive relay is connected with the positive electrode of the high-voltage device;
the first end of the negative relay is connected with the negative electrode of the power battery, and the second end of the negative relay is connected with the negative electrode of the high-voltage device;
the first end of the pre-charging relay is connected with the positive electrode of the power battery, and the second end of the pre-charging relay is connected with the positive electrode of the high-voltage device through the pre-charging resistor;
the two ends of the positive relay, the negative relay and the pre-charging relay are respectively connected with the two ends of the relay control module;
the relay control module is used for providing power for the positive relay, the negative relay and the pre-charging relay and controlling the closing and opening of the positive relay, the negative relay and the pre-charging relay.
In a third aspect, a control device for high voltage power up is provided, the device being configured to control the high voltage power up circuit according to the second aspect, and comprising:
the first control unit is used for providing power for the positive electrode relay, the negative electrode relay and the pre-charging relay under the condition of high-voltage power-on of the high-voltage device and controlling the disconnection of the positive electrode relay, the negative electrode relay and the pre-charging relay; detecting whether the positive relay has a fault or not;
the second control unit is used for controlling the pre-charging relay to be closed and judging whether the negative relay fails or not if the positive relay fails;
the third control unit is used for controlling the negative relay to be closed so as to precharge and time the high-voltage device if the negative relay does not have a fault;
and the fourth control unit is used for controlling the pre-charging relay to be opened and controlling the positive relay to be closed if the voltage at the two ends of the high-voltage device is not smaller than the preset voltage within the preset time length so as to finish the high-voltage power-on of the high-voltage device.
In a fourth aspect, an electric vehicle is presented, comprising the high voltage power-on circuit according to the second aspect.
In a fifth aspect, an electronic device is provided, comprising a processor and a memory electrically connected to the processor, the memory storing a program or instructions that, when executed by the processor, implement the method according to the first aspect.
In a sixth aspect, a readable storage medium is provided, on which a program or instructions is stored, which when executed by a processor, implement the method according to the first aspect.
The above-mentioned at least one technical scheme that this application embodiment adopted can reach following beneficial effect:
when the electric vehicle is electrified at high voltage, under the condition that power is provided for the positive relay, the negative relay and the pre-charging relay in the high-voltage electrifying circuit, the three relays can be controlled to be disconnected first, and whether the positive relay fails or not is judged; if no fault occurs, closing the pre-charging relay and judging whether the negative relay has the fault or not; if no fault occurs, closing the negative relay to precharge high-voltage devices in the vehicle; if the voltage at the two ends of the high-voltage device is not less than the preset voltage within the preset duration of the precharge, the precharge is successful, and the precharge relay can be opened and the positive relay can be closed, so that the high-voltage power-on of the high-voltage device is completed. According to the control logic for the high-voltage power-on circuit, when the high-voltage device is powered on at high voltage, the electric vehicle can be enabled to be safely precharged at high voltage through fault detection on different relays at different stages, the reliability and safety of the high-voltage power-on of the electric vehicle are guaranteed, and damage to the high-voltage device is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a flow chart of a control method for high voltage power-up according to one embodiment of the present application;
FIG. 2 is a schematic diagram of the structure of a high voltage power-on circuit according to one embodiment of the present application;
FIG. 3 is a schematic diagram of the structure of a high voltage power-on circuit according to one embodiment of the present application;
FIG. 4 is a flow chart of a control method for high voltage power-on according to one embodiment of the present application;
FIG. 5 is a schematic structural diagram of an electronic device according to one embodiment of the present application;
fig. 6 is a schematic structural diagram of a control device for high voltage power-on according to an embodiment of the present application.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a flow chart of a control method of high voltage power-on according to an embodiment of the present application. The control method can be applied to a high voltage power-on circuit. For easy understanding, the specific structure of the high-voltage power-on circuit will be described in conjunction with fig. 2 and 3, and then the control method of the high-voltage power-on provided in the embodiment of the present application will be described in detail on the basis of the high-voltage power-on circuit.
Fig. 2 is a schematic diagram of a high voltage power-on circuit according to an embodiment of the present application. The high-voltage power-on circuit shown in fig. 2 includes a positive relay 21, a negative relay 22, a pre-charging relay 23, a pre-charging resistor 24, a power battery 25, a high-voltage device 26 and a relay control module 27, and these devices are connected as follows:
the positive electrode relay 21 has a first end (a end shown in fig. 2) connected to the positive electrode of the power battery 25 and a second end (B end shown in fig. 2) connected to the positive electrode of the high-voltage device 26.
The negative electrode relay 22 has a first end (C-terminal shown in fig. 2) connected to the negative electrode of the power battery 25 and a second end (D-terminal shown in fig. 2) connected to the negative electrode of the high-voltage device 26.
The first terminal (E terminal shown in fig. 2) of the precharge relay 23 is connected to the positive electrode of the power battery 25, and the second terminal (F terminal shown in fig. 2) is connected to the positive electrode of the high-voltage device 26 through the precharge resistor 24.
Both ends of the positive electrode relay 22, the negative electrode relay 22 and the pre-charge relay 23 are connected to both ends of the relay control module 27, respectively.
In this embodiment, the relay control module 27 may be used to supply power to the positive electrode relay 22, the negative electrode relay 22, and the precharge relay 23, and to control the closing or opening of the positive electrode relay 22, the negative electrode relay 22, and the precharge relay 23 during the high-voltage power-up of the high-voltage device 26. In addition, the relay control module 27 can also detect whether the positive relay 22 and the negative relay 22 fail or not in the high-voltage power-on process, whether the pre-charging process fails or not, and the like, so that the safe pre-charging of the high-voltage device can be realized, the reliability and the safety of the high-voltage power-on of the electric vehicle are ensured, and the damage to the high-voltage device is avoided.
Optionally, the high voltage power up circuit shown in fig. 2 may further include a first voltage sensor, a second voltage sensor, and a third voltage sensor (not shown in fig. 2), wherein:
the two ends of the first voltage sensor are respectively connected with the positive electrode and the negative electrode of the power battery 25, and are specifically used for detecting the voltages at the two ends of the power battery 25. Both ends of the second voltage sensor are respectively connected with the positive electrode of the power battery 25 and the negative electrode of the high-voltage device 26, and are specifically used for detecting the voltage between the positive electrode of the power battery 25 and the negative electrode of the high-voltage device 26. Both ends of the third voltage sensor are respectively connected with the positive electrode and the negative electrode of the high-voltage device 26, and are specifically used for detecting the voltages at both ends of the high-voltage device 26.
In the process of powering up the high voltage device at high voltage, the voltages measured by the first voltage sensor, the second voltage sensor and the third voltage sensor may be used for detecting whether the positive electrode relay 22 and the negative electrode relay 22 are faulty by the relay control module 27, which will be described in detail later.
In a more specific implementation, the relay control module shown in fig. 2 may specifically include a main control module, a low voltage relay, a power module, and a control execution module. The control execution module can communicate with the main control module, and can output high level or low level under the control of the main control module. The master control module may be a complete vehicle control unit VCU. The control execution module may be a battery management system BMS, and the communication manner between the control execution module and the master control module may be controller area network (Controller Area Network, CAN) communication, CANFD (CAN with Flexible Data rate) communication, other communication manners, and the like. The power supply module may be a 12V power supply, and the 12V power supply may also output a high level to the outside.
In addition, the low-voltage relay described above, and the positive electrode relay 21, the negative electrode relay 22, and the precharge relay 23 shown in fig. 2 may each include a switch and a control coil. The relay is closed when the levels at the two ends of the control coil of any relay are different, and otherwise, the relay is opened when the levels at the two ends of the control coil are the same.
In the case that the relay control module shown in fig. 2 includes the above-mentioned low-voltage relay, the power module, the control execution module, and the main control module, and the low-voltage relay, the positive relay, the negative relay, and the pre-charging relay include the switch and the control coil, the specific connection structure of the high-voltage power-on circuit shown in fig. 2 may be as shown in fig. 3.
In fig. 3, the first ends (coil left sides) of the control coils C1, C2 and C3 in the positive electrode relay 21, the negative electrode relay 22 and the precharge relay 23 are all connected to the power supply module 272 through the switch in the low voltage relay 271, the second ends (coil right sides) are all connected to the control execution module 273, the first end (coil left side) of the control coil C4 in the low voltage relay 271 is connected to the power supply module 272, and the second ends (coil right sides) are connected to the main control module 274.
The first end (switch left) of the switch S1 in the positive relay 21 is connected to the positive electrode of the power battery 25, the second end (switch right) is connected to the positive electrode of the high-voltage device 26, the first end (switch left) of the switch S2 in the negative relay 22 is connected to the negative electrode of the power battery 25, the second end (switch right) is connected to the negative electrode of the high-voltage device 26, the first end (switch left) of the switch S3 in the precharge relay 23 is connected to the positive electrode of the power battery 25, and the second end (switch right) is connected to the positive electrode of the high-voltage device 26 through the precharge resistor 24. Fig. 3 also shows the first, second and third voltage sensors described above, denoted by V1, V2 and V3, respectively.
In the circuit shown in fig. 3, a main control module 274 is used to control the opening and closing of the low-voltage relay 271, and a power supply module 272 is used to supply power to the positive relay 21, the negative relay 22, and the precharge relay 23. Specifically, when power needs to be supplied to the positive electrode relay 21, the negative electrode relay 22 and the pre-charging relay 23, the main control module 274 may control the low voltage relay 271 to be closed, and the power module 272 supplies power to the positive electrode relay 21, the negative electrode relay 22 and the pre-charging relay 23 through the low voltage relay 271. When power is not required to be supplied to the positive electrode relay 21, the negative electrode relay 22 and the pre-charging relay 23, the main control module 274 may control the low voltage relay 271 to be turned off, and at this time, the power supply module 272 cuts off the power supplied to the positive electrode relay 21, the negative electrode relay 22 and the pre-charging relay 23.
The control execution module 273 is used for outputting a high level or a low level under the control of the main control module 274 so that the main control module 274 controls the closing and opening of the positive electrode relay 21, the negative electrode relay 22 and the pre-charging relay 23, and in addition, the main control module 274 is also used for detecting whether the positive electrode relay 21, the negative electrode relay 22 and the pre-charging relay 23 have faults or not in the process of high-voltage power-up.
The method for controlling high voltage power up provided in the embodiment of the present application will be described in detail below with reference to the high voltage power up circuits shown in fig. 2 and 3. The high-voltage power-on method provided by the embodiment of the application may refer to fig. 1, and specifically may include the following steps.
S102: under the condition of high-voltage power-on of the high-voltage device, power supplies are provided for the positive electrode relay, the negative electrode relay and the pre-charging relay, and the positive electrode relay, the negative electrode relay and the pre-charging relay are controlled to be disconnected.
When high voltage device 26 is required to be powered up at high voltage (such as when starting an electric vehicle or when charging an electric vehicle), relay control module 27 may provide power to positive relay 22, negative relay 22, and pre-charge relay 23 and control positive relay 22, negative relay 22, and pre-charge relay 23 to open.
Specifically, the main control module 274 in the relay control module 27 may output a low level to the right side port of C4, and at this time, since the power module 272 may output a high level to the left side port of C4, the low voltage relay 271 may be closed due to the different levels of the ports on both sides of C4. With the low voltage relay 272 closed, the power module 272 will provide power to the positive relay 22, the negative relay 22, and the pre-charge relay 23 through the low voltage relay 272.
In the case where the power supply module 272 supplies power to the positive electrode relay 22, the negative electrode relay 22, and the precharge relay 23, the power supply module 272 outputs a high level to the left side ports of the control coils C1, C2, and C3 in the positive electrode relay 22, the negative electrode relay 22, and the precharge relay 23. To control the opening of the positive relay 22, the negative relay 22, and the precharge relay 23, the main control module 274 may communicate with the control execution module 273, and control the control execution module 273 to output high levels to the right side ports of C1, C2, and C3. At this time, the levels of both side ports of C1, C2, and C3 are the same, and the positive relay 22, the negative relay 22, and the precharge relay 23 are all turned off.
S104: and judging whether the positive relay has faults or not.
The present embodiment may detect whether the positive relay 22 is malfunctioning by the main control module 274 in the relay control module 27. Whether the positive electrode relay 22 fails or not is understood as whether the positive electrode relay 22 has a stuck failure or not.
Specifically, the main control module 274 may acquire the voltage (for convenience of distinction, may be represented by a first voltage) between the positive electrode of the power battery 25 and the negative electrode of the high voltage device 26 measured by the second voltage sensor V2 shown in fig. 3, and simultaneously acquire the voltage (for convenience of distinction, may be represented by a second voltage) across the high voltage device 26 measured by the third voltage sensor V3 shown in fig. 3. After that, whether the positive electrode relay 21 malfunctions may be detected based on the first voltage and the second voltage.
Since the positive electrode relay 21 should be in an open state in the case where the positive electrode relay 21 is not failed, a closed circuit is not formed between the positive electrode of the power battery 25 and the negative electrode of the high-voltage device 26, and the difference (absolute value) between the first voltage and the second voltage should be not less than the set voltage (which may be set according to practical situations, and is not particularly limited herein). Therefore, in detecting whether the positive electrode relay 22 is malfunctioning based on the first voltage and the second voltage, if the difference between the first voltage and the second voltage is not actually smaller than the set voltage, it can be interpreted that the positive electrode relay 21 is indeed in the off state and no malfunction has occurred. Conversely, if the difference between the first voltage and the second voltage is actually smaller than the set voltage, it may be indicated that the positive relay 21 is malfunctioning.
If the positive relay 22 fails, the main control module 274 may control the power supply module 272 to cut off the power supply to the positive relay 22, the negative relay 22 and the pre-charging relay 23 so as not to damage the high voltage device. Specifically, the main control module 274 may output a high level to control the low voltage relay 271 to be turned off. In the case where the low-voltage relay 271 is turned off, the power module 272 will not be able to supply power to the positive relay 22, the negative relay 22, and the precharge relay 23, i.e., will cut off the power.
If the positive electrode relay 22 is not failed as a result of the detection, it may be indicated that the positive electrode relay 22 is in an off state, and at this time, S106 may be executed to perform a subsequent precharge preparation operation.
S106: if the positive relay fails, the pre-charging relay is controlled to be closed, and whether the negative relay fails or not is judged.
In S106, the pre-charge relay 23 may be controlled to close by the main control module 274 in the relay control module 27. Specifically, the main control module 274 may communicate with the control execution module 273 and control the control execution module 273 to output a low level to the right port of C3. At this time, the level of the both side ports of C3 is different, so that the precharge relay 23 is closed.
In detecting whether the negative relay 22 is malfunctioning, it may be implemented by the main control module 274 in the relay control module 27. Whether the negative electrode relay 22 fails may also be understood as whether the negative electrode relay 22 has a stuck failure. Specifically, the main control module 274 may acquire the voltage across the high voltage device 26 measured by the third sensor shown in fig. 3, and detect whether the negative relay 22 fails based on the voltage.
Since the negative electrode relay 22 should be in an open state in the case where the negative electrode relay 22 is not failed, a closed circuit is not formed between the power battery 25, the precharge relay 23, the precharge resistor 24, the high voltage device 2 and the negative electrode relay 22 even if the precharge relay 23 is closed, and accordingly, the voltage across the high voltage device 26 is not raised and is less than the set voltage (which can be set according to the actual situation). Therefore, when detecting whether or not the negative electrode relay 22 is malfunctioning based on the voltage across the high-voltage device 26, if the voltage does not rise to and is always smaller than the set voltage, it can be interpreted that the negative electrode relay 22 is indeed in the off state and does not malfunction. Conversely, if the voltage gradually increases to the set voltage, it can be stated that the negative relay 22 is malfunctioning.
If the negative relay 22 fails as a result of the detection, it indicates that the pre-charging cannot be performed, and at this time, in order not to damage the high voltage device, the main control module 274 may control the pre-charging relay 23 to be turned off, and simultaneously cut off the power supply provided by the power supply module 272 to the positive relay 22, the negative relay 22 and the pre-charging relay 23. When the precharge relay 23 is controlled to be turned off, the main control module 274 may control the control execution module 273 such that the control execution module 273 outputs a high level to the right port of C3. At this time, the level of both side ports of C3 is the same, and the precharge relay 23 is turned off. The specific implementation of the main control module 274 in controlling the power supply interruption module 272 to supply the power to the positive relay 22, the negative relay 22 and the pre-charging relay 23 can be seen from the corresponding content in S104, which will not be described in detail here.
If the negative electrode relay 22 is not failed as a result of the detection, it may be indicated that the negative electrode relay 22 is in an off state, and at this time, S108 may be performed to precharge the high voltage device 26.
S108: and if the negative electrode relay does not fail, controlling the negative electrode relay to be closed so as to precharge and time the high-voltage device.
In S108, the negative relay 22 may be controlled to close by the master control module 274 in the relay control module 27. Specifically, the main control module 274 controls the control execution module 273 such that the control execution module 273 outputs a low level to the right port of C2. At this time, the level of the both side ports of C2 is different, so that the negative relay 22 is closed.
After closing the negative relay 22, the power battery 25, the pre-charge relay 23, the pre-charge bank 24, the high voltage device 26 and the negative relay 22 will form a closed loop, at which time the power battery 25 will pre-charge the high voltage device 26 through the pre-charge resistor 24.
The master control module 274 may time when the high voltage device 26 is precharged. Within a preset time period (which may be set according to actual conditions) of the timing, the voltage across the high-voltage device 26 measured by the third voltage sensor shown in fig. 3 may be obtained, and it may be determined whether the voltage is not less than the preset voltage. The preset voltage may be 90% -95% of the voltage of the power battery 25, and may be specifically set according to practical situations, which is not specifically limited herein.
If the voltage across the high voltage device 26 is not less than the predetermined voltage as a result of the determination, it may be indicated that the high voltage device 26 is successfully precharged. At this time, S110 may be performed. Conversely, if the voltage across the high voltage device 26 is less than the predetermined voltage as a result of the determination, a precharge failure of the high voltage device 26 may be indicated. At this time, in order to avoid damaging the high voltage device 26, the main control module 274 may control the pre-charge relay 23 and the negative electrode relay 22 to be turned off, and simultaneously cut off the power supply provided by the power supply module 272 to the positive electrode relay 22, the negative electrode relay 22 and the pre-charge relay 23. Wherein, when the precharge relay 23 and the negative relay 22 are controlled to be opened, the main control module 274 may control the control execution module 273 such that the control execution module 273 outputs a high level to the right side ports of C2 and C3. At this time, the level of both side ports of C2 and C3 is the same, and the negative relay 22 and the precharge relay 23 are turned off. The specific implementation of the main control module 274 in controlling the power supply interruption module 272 to supply the power to the positive relay 22, the negative relay 22 and the pre-charging relay 23 can be seen from the corresponding content in S104, which will not be described in detail here.
S110: and in the preset time period, if the voltage at the two ends of the high-voltage device is not less than the preset voltage, controlling the pre-charging relay to be opened and controlling the positive relay to be closed so as to finish the high-voltage power-on of the high-voltage device.
In S110, the control module 274 may control the precharge relay 23 to open and the positive relay 21 to close. When the pre-charge relay 23 is controlled to be turned off, the main control module 274 may control the control execution module 273 such that the control execution module 273 outputs a high level to the right port of C3. At this time, the level of both side ports of C3 is the same, and the precharge relay 23 is turned off.
The main control module 274 may control the control execution module 273 such that the control execution module 273 outputs a low level to the right port of C1 when the control positive relay 21 is closed. At this time, the level of the both side ports of C1 is different, and the positive relay 21 is closed.
It should be noted that, when the main control module 274 controls to close the positive relay 21, in order to ensure that the positive relay 21 is successfully closed, the main control module 274 may also detect whether a difference between the voltages between the positive electrode of the power battery 25 and the negative electrode of the high voltage device 26 and the voltages across the high voltage device 26 is less than a set voltage (may be equal to the set voltage set when detecting whether the positive relay 21 has a fault). If the current value is smaller than the preset value, the positive relay 22 can be indicated to be successfully closed, and the master control module 274 controls the pre-charging relay 23 to be opened.
In the case of controlling the positive relay 21 to close and the pre-charge relay 23 to open, the power battery 25, the positive relay 21, the high-voltage device 26 and the negative relay 22 form a closed loop, and the power battery 25 can boost the voltage across the high-voltage device 26 to the voltage across the power battery 25, and the high-voltage power on of the high-voltage device 26 is completed.
Alternatively, in the above-described process of high-voltage-boosting the high-voltage device 26, if the positive electrode relay 21, the negative electrode relay 22, or the precharge relay 23 fails, the high-voltage device 26 cannot be charged at high voltage, and at this time, maintenance or the like may be performed on the failed relay so that the high-voltage device 26 may be high-voltage-boosted after the failure is repaired.
In order to facilitate understanding of the control method of high-voltage power-on provided in the embodiments of the present application, reference may be made to fig. 4. Fig. 4 is a flow chart of a control method of high voltage power-on according to an embodiment of the present application. The embodiment shown in fig. 4 may include the following steps.
S401: when the high-voltage device is electrified at high voltage, power supplies are provided for the positive electrode relay, the negative electrode relay and the pre-charging relay, and the positive electrode relay, the negative electrode relay and the pre-charging relay are controlled to be disconnected.
S402: and judging whether the positive relay has faults or not.
If yes, then execute S407; if not, then S403 is performed.
S403: and controlling the pre-charge relay to be closed, and judging whether the negative relay fails or not.
If yes, then execute S407; if not, S404 is performed.
S404: the negative relay is controlled to close to precharge and time the high voltage device.
S405: and in the preset time period, whether the voltage at the two ends of the high-voltage device is not smaller than the preset voltage or not.
If yes, executing S406; if not, then S407 is performed.
S406: and controlling the pre-charging relay to be opened and controlling the positive relay to be closed so as to finish high-voltage power-on of the high-voltage device.
S407: and controlling the closed positive electrode relay, negative electrode relay and/or pre-charging relay to be opened, and cutting off the power supply for the positive electrode relay, the negative electrode relay and the pre-charging relay.
Specifically, if the positive relay fails, the power supply to the positive relay, the negative relay, and the precharge relay may be controlled to be turned off. If the negative relay fails, the pre-charge relay can be controlled to be disconnected, and the power supply for the positive relay, the negative relay and the pre-charge relay is cut off. If the voltage at the two ends of the high-voltage device is smaller than the preset voltage, the pre-charging relay and the negative relay are controlled to be disconnected, and the power supply for the positive relay, the negative relay and the pre-charging relay is cut off.
The following will describe a control method for high-voltage power-on provided in the embodiment of the present application with reference to fig. 3 and 4. Wherein the power module 272 may be a 12V power supply.
In fig. 3, the master control module 274 detects whether the electric vehicle has a high voltage on demand. If so (e.g., when the electric vehicle is started or charged), the main control module 274 outputs a low level to the right side port of the control coil C4, and the low voltage relay K4 is closed. The power module 272 provides 12V power to the left side ports of the control coils C1, C2, and C3 through S4. At this time, the main control module 274 communicates with the control execution module 273, and instructs the control execution module 273 to output a high level to the right side ports of C1, C2, and C3, with the positive relay 21, the negative relay 22, and the precharge relay 23 in the off state.
The master control module 274 may obtain voltages U2 and U3 detected by V2 and V3, respectively. If the difference (absolute value) between U2 and U3 is less than or equal to a certain value (for example, 5V), it indicates that the positive relay 21 has an adhesion fault, and at this time, high-voltage power cannot be applied, the main control module 274 outputs a high level to the right port of C4, the low-voltage relay K4 is turned off, and the 12V power supply provided for the positive relay 21, the negative relay 22 and the precharge relay 23 is cut off. If the difference between U2 and U3 is greater than a certain value (e.g., 5V), this indicates that the positive relay 21 is in the off state, and no adhesion failure occurs.
In the case where the positive electrode relay 21 does not fail, the main control module 274 controls the control execution module 274 such that the control execution module 274 outputs a low level to the right port of C3 and the precharge relay 23 is closed. Thereafter, the main control module 274 obtains the voltage U3 measured by V3. If U3 gradually rises and is greater than a certain value (for example, 60V), it indicates that the negative relay K2 has an adhesion failure and cannot be powered on at high voltage, and at this time, the main control module 273 controls the control execution module 274 to output a high level to the port on the right side of C3, so that the precharge relay 23 is turned off. In addition, the main control module 274 outputs a high level to the right port of C4 to turn off the low voltage relay K4, and cuts off the 12V power supplied from the power module 272 to the positive relay 21, the negative relay 22 and the pre-charge relay 23. If U3 does not rise and is less than a certain value (for example, 60V), it indicates that the negative relay 22 is in a normal off state, and no adhesion failure occurs.
In the case that the negative electrode relay 22 has no adhesion failure, the main control module 274 controls the control execution module 274 to output a low level to the right port of C2, and the negative electrode relay 22 is closed. While the master control module 274 performs timing. The main control module 274 may determine whether the U3 detected by V3 is not less than the set ratio (e.g., 95%) of the U1 detected by V1 (i.e., the voltage of the power battery 25) for a predetermined period of time.
If it is smaller than the predetermined value, it may be determined that the precharge is not successfully performed, and at this time, it is determined that the high voltage cannot be applied, and the main control module 274 controls the control execution module 273 to output a high level to the right ports of C2 and C3 to turn off the precharge relay 23 and the negative relay 22. In addition, the main control module 274 outputs a high level to the right port of C4 to control the low voltage relay 271 to be turned off, and cuts off the 12V power supplied from the power module 272 to the positive relay 21, the negative relay 22 and the pre-charge relay 23.
If the output voltage is greater than the preset threshold, the main control module 274 controls the control execution module 273 to output a low level to the right port of C1 and a high level to the right port of C3 to turn off the precharge relay 23. At this time, the power battery 25 will boost the voltage across the high voltage device 26 to the voltage across the power battery 25, and the high voltage is ended.
When the electric vehicle is electrified at high voltage, under the condition that power is provided for the positive relay, the negative relay and the pre-charging relay in the high-voltage electrifying circuit, the three relays can be controlled to be disconnected first, and whether the positive relay fails or not is judged; if no fault occurs, closing the pre-charging relay and judging whether the negative relay has the fault or not; if no fault occurs, closing the negative relay to precharge high-voltage devices in the vehicle; if the voltage at the two ends of the high-voltage device is not less than the preset voltage within the preset duration of the precharge, the precharge is successful, and the precharge relay can be opened and the positive relay can be closed, so that the high-voltage power-on of the high-voltage device is completed. According to the control logic for the high-voltage power-on circuit, when the high-voltage device is powered on at high voltage, the electric vehicle can be enabled to be safely precharged at high voltage through fault detection on different relays at different stages, the reliability and safety of the high-voltage power-on of the electric vehicle are guaranteed, and damage to the high-voltage device is avoided.
The embodiment of the application also provides an electric vehicle, which comprises the high-voltage power-on circuit shown in fig. 2 or 3.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application. Referring to fig. 5, at the hardware level, the electronic device includes a processor, and optionally an internal bus, a network interface, and a memory. The Memory may include a Memory, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory (non-volatile Memory), such as at least 1 disk Memory. Of course, the electronic device may also include hardware required for other services.
The processor, network interface, and memory may be interconnected by an internal bus, which may be an ISA (Industry Standard Architecture ) bus, a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus, or EISA (Extended Industry Standard Architecture ) bus, among others. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one bi-directional arrow is shown in FIG. 5, but not only one bus or type of bus.
And the memory is used for storing programs. In particular, the program may include program code including computer-operating instructions. The memory may include memory and non-volatile storage and provide instructions and data to the processor.
The processor reads the corresponding computer program from the nonvolatile memory into the memory and then runs, and a control device for high-voltage power-on is formed on a logic level. The processor is used for executing the programs stored in the memory and is specifically used for executing the following operations:
under the condition of high-voltage power-on of the high-voltage device, power supplies are provided for the positive electrode relay, the negative electrode relay and the pre-charging relay, and the positive electrode relay, the negative electrode relay and the pre-charging relay are controlled to be disconnected;
detecting whether the positive relay has a fault or not;
if the positive relay does not have a fault, controlling the pre-charging relay to be closed, and judging whether the negative relay has a fault or not;
if the negative relay does not have a fault, controlling the negative relay to be closed so as to precharge and time the high-voltage device;
and if the voltage at the two ends of the high-voltage device is not smaller than the preset voltage within the preset time, controlling the pre-charging relay to be opened and controlling the positive relay to be closed so as to finish the high-voltage power-on of the high-voltage device.
The method performed by the high-voltage power-on control device disclosed in the embodiment shown in fig. 5 of the present application may be applied to a processor or implemented by the processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.
The electronic device may further execute the methods of fig. 1 and fig. 4, and implement the functions of the control device for high-voltage power-on in the embodiments shown in fig. 1 and fig. 4, which are not described herein.
Of course, other implementations, such as a logic device or a combination of hardware and software, are not excluded from the electronic device of the present application, that is, the execution subject of the following processing flow is not limited to each logic unit, but may be hardware or a logic device.
The present embodiments also provide a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a portable electronic device comprising a plurality of application programs, enable the portable electronic device to perform the methods of the embodiments shown in fig. 1 and 4, and in particular to perform the operations of:
under the condition of high-voltage power-on of the high-voltage device, power supplies are provided for the positive electrode relay, the negative electrode relay and the pre-charging relay, and the positive electrode relay, the negative electrode relay and the pre-charging relay are controlled to be disconnected;
detecting whether the positive relay has a fault or not;
If the positive relay does not have a fault, controlling the pre-charging relay to be closed, and judging whether the negative relay has a fault or not;
if the negative relay does not have a fault, controlling the negative relay to be closed so as to precharge and time the high-voltage device;
and if the voltage at the two ends of the high-voltage device is not smaller than the preset voltage within the preset time, controlling the pre-charging relay to be opened and controlling the positive relay to be closed so as to finish the high-voltage power-on of the high-voltage device.
Fig. 6 is a schematic structural diagram of a control device 60 for high voltage power-on according to an embodiment of the present application. Referring to fig. 6, in a software embodiment, the control device 60 for high voltage power-on is applied to a high voltage power-on circuit, and the high voltage power-on circuit includes: the both ends respectively with the positive pole of power battery and the positive pole of high-voltage device positive pole relay, the both ends respectively with the negative pole of power battery with the negative pole of high-voltage device is connected negative pole relay the both ends of positive pole relay connect in parallel have precharge relay and the precharge resistance that establish ties mutually, positive pole relay negative pole relay and the both ends of precharge relay all are connected with relay control module, high-voltage power-on's controlling means 60 can include: a first control unit 61, a second control unit 62, a third control unit 63, and a fourth control unit 64, wherein:
A first control unit 61 that supplies power to the positive electrode relay, the negative electrode relay, and the precharge relay and controls the positive electrode relay, the negative electrode relay, and the precharge relay to be turned off when the high-voltage device is high-voltage-powered; detecting whether the positive relay has a fault or not;
a second control unit 62 for controlling the pre-charge relay to be closed and judging whether the negative relay has a fault if the positive relay has not a fault;
a third control unit 63 for controlling the negative relay to be closed to precharge and time the high voltage device if the negative relay is not failed;
and a fourth control unit 64, for controlling the pre-charging relay to be opened and controlling the positive relay to be closed if the voltage at the two ends of the high-voltage device is not less than the preset voltage within the preset time period, so as to complete the high-voltage power-on of the high-voltage device.
Alternatively, the first control unit 61 determines whether the positive electrode relay has failed, including:
acquiring a first voltage between a positive electrode of the power battery and a negative electrode of the high-voltage device, and a second voltage at two ends of the high-voltage device;
Judging whether the difference between the first voltage and the second voltage is smaller than a first set voltage or not;
if yes, determining that the positive relay fails;
if not, determining that the positive relay has no fault.
Alternatively, the second control unit 62 determines whether the negative relay has failed, including:
judging whether the voltage at two ends of the high-voltage device is gradually increased or not and is not smaller than a second set voltage within a set time length;
if yes, determining that the negative relay fails;
if not, determining that the negative relay has no fault.
Alternatively, the second control unit 62 controls to cut off the power supplied to the positive electrode relay, the negative electrode relay, and the precharge relay if the positive electrode relay fails.
Optionally, the third control unit 63 controls the pre-charging relay to be turned off and cuts off the power supply to the positive electrode relay, the negative electrode relay, and the pre-charging relay if the negative electrode relay fails.
Optionally, the fourth control unit 64 controls the pre-charging relay and the negative electrode relay to be disconnected and cuts off the power supply to the positive electrode relay, the negative electrode relay and the pre-charging relay if the voltage across the high voltage device is less than the preset voltage.
The high-voltage power-on control device 60 provided in the embodiment of the present application may further execute the methods of fig. 1 and fig. 4, and implement the functions of the high-voltage power-on control device in the embodiment shown in fig. 1 and fig. 4, which are not described herein again.
In summary, the foregoing description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. One typical implementation is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
All embodiments in the application are described in a progressive manner, and identical and similar parts of all embodiments are mutually referred, so that each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
Claims (10)
1. A control method for high voltage power up, applied to a high voltage power up circuit, the high voltage power up circuit comprising: the control method comprises the following steps that a positive relay with two ends respectively connected with a positive electrode of a power battery and a positive electrode of a high-voltage device, a negative relay with two ends respectively connected with a negative electrode of the power battery and a negative electrode of the high-voltage device, and a pre-charging relay and a pre-charging resistor which are connected in series are connected in parallel at two ends of the positive relay, wherein the positive relay, the negative relay and the two ends of the pre-charging relay are connected with a relay control module, and the control method comprises the following steps:
Under the condition of high-voltage power-on of the high-voltage device, providing power for the positive electrode relay, the negative electrode relay and the pre-charging relay, and controlling the disconnection of the positive electrode relay, the negative electrode relay and the pre-charging relay;
detecting whether the positive relay has a fault or not;
if the positive relay does not have a fault, controlling the pre-charging relay to be closed, and judging whether the negative relay has a fault or not;
if the negative relay does not have a fault, controlling the negative relay to be closed so as to precharge and time the high-voltage device;
and if the voltage at the two ends of the high-voltage device is not smaller than the preset voltage within the preset time, controlling the pre-charging relay to be opened and controlling the positive relay to be closed so as to finish the high-voltage power-on of the high-voltage device.
2. The control method according to claim 1, wherein determining whether the positive electrode relay has failed comprises:
acquiring a first voltage between a positive electrode of the power battery and a negative electrode of the high-voltage device, and a second voltage at two ends of the high-voltage device;
judging whether the difference between the first voltage and the second voltage is smaller than a first set voltage or not;
If yes, determining that the positive relay fails;
if not, determining that the positive relay has no fault.
3. The control method according to claim 1, wherein determining whether the negative relay has failed comprises:
judging whether the voltage at two ends of the high-voltage device is gradually increased or not and is not smaller than a second set voltage within a set time length;
if yes, determining that the negative relay fails;
if not, determining that the negative relay has no fault.
4. The control method according to claim 1, characterized in that the method further comprises:
and if the positive relay fails, controlling to cut off the power supply provided for the positive relay, the negative relay and the pre-charging relay.
5. The control method according to claim 1, characterized in that the method further comprises:
and if the negative electrode relay fails, controlling the pre-charging relay to be disconnected, and cutting off power supplies provided for the positive electrode relay, the negative electrode relay and the pre-charging relay.
6. The control method according to claim 1, characterized in that the method further comprises:
And if the voltage at the two ends of the high-voltage device is smaller than the preset voltage, the pre-charging relay and the negative electrode relay are controlled to be disconnected, and the power supply for the positive electrode relay, the negative electrode relay and the pre-charging relay is cut off.
7. The utility model provides a high voltage power-on circuit, its characterized in that includes positive pole relay, negative pole relay, precharge resistor, power battery, high-voltage device and relay control module, wherein:
the first end of the positive relay is connected with the positive electrode of the power battery, and the second end of the positive relay is connected with the positive electrode of the high-voltage device;
the first end of the negative relay is connected with the negative electrode of the power battery, and the second end of the negative relay is connected with the negative electrode of the high-voltage device;
the first end of the pre-charging relay is connected with the positive electrode of the power battery, and the second end of the pre-charging relay is connected with the positive electrode of the high-voltage device through the pre-charging resistor;
the two ends of the positive relay, the negative relay and the pre-charging relay are respectively connected with the two ends of the relay control module;
the relay control module is used for: under the condition of high-voltage power-on of the high-voltage device, providing power for the positive electrode relay, the negative electrode relay and the pre-charging relay, and controlling the disconnection of the positive electrode relay, the negative electrode relay and the pre-charging relay; detecting whether the positive relay has a fault or not; if the positive relay does not have a fault, controlling the pre-charging relay to be closed, and judging whether the negative relay has a fault or not; if the negative relay does not have a fault, controlling the negative relay to be closed so as to precharge and time the high-voltage device; and if the voltage at the two ends of the high-voltage device is not smaller than the preset voltage within the preset time, controlling the pre-charging relay to be opened and controlling the positive relay to be closed so as to finish the high-voltage power-on of the high-voltage device.
8. The high voltage power-on circuit of claim 7, wherein the relay control module comprises: the main control module, low-voltage relay, power module and control execution module, low-voltage relay the anodal relay the negative pole relay with all include switch and control coil in the precharge relay, wherein:
the control system comprises a power module, a control execution module, a control coil, a positive electrode relay, a negative electrode relay, a pre-charging relay, a control coil, a control execution module, a control module and a control module, wherein the first ends of the control coil in the positive electrode relay, the negative electrode relay and the pre-charging relay are all connected with the power module through switches in the low-voltage relay, the second ends of the control coil in the low-voltage relay are all connected with the control execution module, and the first ends of the control coil in the low-voltage relay are connected with the power module, and the second ends of the control coil in the low-voltage relay are connected with the main control module;
the first end of the switch in the positive relay is connected with the positive electrode of the power battery, the second end of the switch in the negative relay is connected with the negative electrode of the high-voltage device, the first end of the switch in the pre-charging relay is connected with the positive electrode of the power battery, and the second end of the switch in the pre-charging relay is connected with the positive electrode of the high-voltage device through the pre-charging resistor;
The power supply module is used for providing power for the positive relay, the negative relay and the pre-charging relay, the control execution module is used for outputting high level or low level under the control of the main control module, and the main control module is used for controlling the closing and opening of the positive relay, the negative relay and the pre-charging relay.
9. The high voltage power up circuit of claim 7, further comprising a first voltage sensor, a second voltage sensor, and a third voltage sensor therein, wherein:
the two ends of the first voltage sensor are respectively connected with the positive electrode and the negative electrode of the power battery and are used for detecting the voltages at the two ends of the power battery;
the two ends of the second voltage sensor are respectively connected with the positive electrode of the power battery and the negative electrode of the high-voltage device and are used for detecting the voltage between the positive electrode of the power battery and the negative electrode of the high-voltage device;
and two ends of the third voltage sensor are respectively connected with the positive electrode and the negative electrode of the high-voltage device and are used for detecting the voltages at two ends of the high-voltage device.
10. An electric vehicle, characterized in that it comprises a high-voltage power-on circuit as claimed in any one of claims 7 to 9.
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| CN106494254B (en) * | 2016-11-29 | 2018-11-27 | 北京新能源汽车股份有限公司 | A kind of power battery charging Protection control system, method and device |
| CN108583287A (en) * | 2018-04-28 | 2018-09-28 | 北京新能源汽车股份有限公司 | A kind of electric automobile high-voltage power-on and power-off control method, device and electric vehicle |
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