CN107656186B - Detection method of high-voltage direct-current circuit and high-voltage direct-current circuit - Google Patents
Detection method of high-voltage direct-current circuit and high-voltage direct-current circuit Download PDFInfo
- Publication number
- CN107656186B CN107656186B CN201710756880.9A CN201710756880A CN107656186B CN 107656186 B CN107656186 B CN 107656186B CN 201710756880 A CN201710756880 A CN 201710756880A CN 107656186 B CN107656186 B CN 107656186B
- Authority
- CN
- China
- Prior art keywords
- resistance value
- current circuit
- voltage direct
- voltage
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 claims description 15
- 238000009413 insulation Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000976416 Isatis tinctoria subsp. canescens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a fault detection method of a high-voltage direct-current circuit and the high-voltage direct-current circuit, relates to the field of fault detection, and aims to solve the technical problem that the fault detection of components in the high-voltage direct-current circuit cannot be realized in the prior art, wherein the fault detection method of the high-voltage direct-current circuit in the embodiment of the invention comprises the following steps: acquiring a first resistance value of an output end of the component to be detected and a second resistance value of an output end of the high-voltage direct-current circuit when the component to be detected and the rest components of the high-voltage direct-current circuit are in a disconnected state; and determining the fault states of the component to be detected and the rest components of the high-voltage direct-current circuit according to the first resistance value and the second resistance value. According to the embodiment of the invention, whether the high-voltage direct-current circuit has a fault can be judged, and when the high-voltage direct-current circuit has a fault, the specific component with the fault can be accurately determined.
Description
Technical Field
The invention relates to the field of fault detection, in particular to a detection method of a high-voltage direct-current circuit and the high-voltage direct-current circuit.
Background
In recent years, disasters such as flood have been more and more frequent due to the influence of greenhouse effect and the like, and the possibility of wading vehicles has been higher. After the vehicle wades into water and runs, the insulation performance of the vehicle needs to be detected, and the vehicle can be continuously driven under the condition that the insulation performance of the vehicle is good. The traditional fault detection method can only detect the high-voltage direct-current circuit and cannot detect whether specific parts in the high-voltage direct-current circuit are in fault or not.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a fault detection method for a high voltage direct current circuit and a high voltage direct current circuit, so as to implement fault detection for components of the high voltage direct current circuit.
In order to solve the above technical problem, a method for detecting a fault of a high voltage dc circuit provided in an embodiment of the present invention includes:
acquiring a first resistance value of an output end of the component to be detected and a second resistance value of an output end of the high-voltage direct-current circuit when the connection between the component to be detected and the rest components of the high-voltage direct-current circuit is in a disconnection state;
and determining the fault states of the component to be detected and the rest components of the high-voltage direct-current circuit according to the first resistance value and the second resistance value.
Preferably, the step of obtaining a first resistance value of the output end of the component to be detected and a second resistance value of the output end of the high-voltage direct-current circuit includes:
and detecting the first resistance value and the second resistance value through a megger to obtain a first resistance value of the output end of the component to be detected and a second resistance value of the output end of the high-voltage direct-current circuit.
Preferably, the step of determining the fault state of the component to be detected and the remaining components of the high voltage direct current circuit according to the first resistance value and the second resistance value comprises:
when the first resistance value is smaller than a first preset resistance value and the second resistance value is equal to the first preset resistance value, determining that the component to be detected is in a fault state and the rest components of the high-voltage direct-current circuit are not in the fault state; or
When the first resistance value is equal to the first preset resistance value and the second resistance value is smaller than the first preset resistance value, determining that the component to be detected is not in a fault state and at least one of the rest components of the high-voltage direct-current circuit is in a fault state; or
And when the first resistance value and the second resistance value are both smaller than the first preset resistance value, determining that at least one of the component to be detected and the rest of the high-voltage direct-current circuit is in a fault state.
Preferably, when the component to be detected is a power battery, the step of acquiring the first resistance value of the output end of the component to be detected includes:
and acquiring a first resistance value of the output end of the power battery when the connection between the power battery and the rest parts of the high-voltage direct-current circuit is in a disconnected state and the connection between the power battery and the external power supply is in a connected state.
Preferably, the method further comprises:
acquiring a third resistance value of the output end of the high-voltage direct-current circuit when the connection between at least two components in the high-voltage direct-current circuit is in a connected state;
and determining the fault state of the high-voltage direct-current circuit according to the third resistance value.
Preferably, the step of obtaining the third resistance value at the output terminal of the high voltage direct current circuit comprises:
acquiring a first voltage value of a first output end of the high-voltage direct-current circuit and a second voltage value of a second output end of the high-voltage direct-current circuit when a resistor connected in parallel with the first output end of the high-voltage direct-current circuit is disconnected with the first output end of the high-voltage direct-current circuit;
acquiring a third voltage value of the first output end of the high-voltage direct-current circuit when a resistor connected in parallel with the first output end of the high-voltage direct-current circuit is connected with the first output end of the high-voltage direct-current circuit in a connected state;
and obtaining the third resistance value according to the first voltage value, the second voltage value and the third voltage value.
Preferably, the step of obtaining the third resistance value according to the first voltage value, the second voltage value and the third voltage value includes:
by the formula:
obtaining the third resistance value RiWherein R is0Is the resistance value of the resistor, U1Is the first voltage value, U1For said second voltage value,' U2Is the third voltage value.
Preferably, the step of determining the fault state of the hvdc circuit based on the third resistance value comprises:
and when the third resistance value is smaller than a second preset resistance value, determining that the high-voltage direct current circuit is in a fault state.
According to another aspect of the embodiments of the present invention, there is also provided a high voltage dc circuit, including:
a controller;
at least two parts of interconnect parallel connection all are equipped with a first control switch on each part place branch, the controller is connected with the first control switch that at least two parts correspond respectively, two at least parts include: at least two of a power battery, a motor controller, a DC/DC controller, a vehicle-mounted charger, a thermistor controller and a compressor controller;
the controller is used for controlling the first control switch of the branch where the part to be detected is located to be disconnected when one of the at least two parts is determined as the part to be detected, so that the part to be detected and the rest parts of the at least two parts are in a disconnected state;
acquiring a first resistance value of an output end of a component to be detected and a second resistance value of an output end of a high-voltage direct-current circuit;
and determining the fault states of the component to be detected and the rest components of the high-voltage direct-current circuit according to the first resistance value and the second resistance value.
Preferably, the high voltage dc circuit further comprises:
the external power supply is connected with the power battery and used for providing an enabling signal for the power battery, the external power supply is connected with the power battery through a second control switch, and the second control switch is connected with the controller;
the controller is specifically configured to: when the component to be detected is determined to be the power battery, controlling the second control switch to be closed, enabling the connection between the power battery and the external power supply to be in a communicated state, and obtaining a first resistance value of the output end of the power battery and a second resistance value of the output end of the high-voltage direct-current circuit after the power battery is communicated with the external power supply;
and determining the fault states of the power battery and the rest parts of the high-voltage direct-current circuit according to the first resistance value and the second resistance value.
Preferably, the controller is further configured to:
and controlling the connection of the first control switches respectively corresponding to the at least two components to be closed, so that the connection between the at least two components is in a communicated state, acquiring a third resistance value of the output ends of the at least two components, and determining the fault state of the high-voltage direct-current circuit according to the third resistance value.
Preferably, the high voltage dc circuit further comprises:
the resistor is connected with the first output end of the high-voltage direct-current circuit in parallel, and is connected with the first output end of the high-voltage direct-current circuit through a third control switch which is connected with the controller;
the controller is further configured to:
controlling the third control switch to be disconnected, so that the connection between the resistor and the first output end of the high-voltage direct-current circuit is in a disconnected state, and acquiring a first voltage value of the first output end of the high-voltage direct-current circuit and a second voltage value of the second output end of the high-voltage direct-current circuit;
controlling the third control switch to be closed, so that the connection between the resistor and the first output ends of the at least two components is in a connected state, and acquiring a third voltage value of the first output end of the high-voltage direct-current circuit;
and obtaining the third resistance value according to the first voltage value, the second voltage value and the third voltage value.
Compared with the prior art, the method and the device for detecting the fault of the high-voltage direct-current circuit provided by the embodiment of the invention at least have the following beneficial effects:
whether the high-voltage direct current circuit breaks down or not can be judged, and when the high-voltage direct current circuit breaks down, the specific parts which break down can be accurately determined.
Drawings
Fig. 1 is a schematic flow chart of a fault detection method for a hvdc circuit according to an embodiment of the present invention;
fig. 2 is a second schematic flowchart of a fault detection method for a hvdc circuit according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of step 3 in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a high-voltage dc circuit according to an embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
Referring to fig. 1, an embodiment of the present invention provides a method for detecting a fault of a high voltage direct current circuit, including:
step 1, acquiring a first resistance value of an output end of a component to be detected and a second resistance value of an output end of a high-voltage direct-current circuit when the connection between the component to be detected and the rest components of the high-voltage direct-current circuit is in a disconnection state.
Specifically, before detecting the first resistance value and the second resistance value, the component to be detected and the remaining components of the high-voltage direct-current circuit need to be disconnected, at this time, the component to be detected is in an open circuit state, a circuit formed by the remaining components of the high-voltage direct-current circuit is also in an open circuit state, and the second resistance value of the output end of the high-voltage direct-current circuit refers to a resistance value of the output end in a circuit formed by the remaining components except the component to be detected.
In step 1, the output ends of the components to be detected comprise an output end connected with the positive end of the high-voltage direct-current circuit and an output end connected with the negative end of the high-voltage direct-current circuit. The first resistance value of the output end of the component to be detected is the resistance value of the two-pole output end of the component to be detected, and the second resistance value of the output end of the high-voltage direct-current circuit is the resistance value of the two-pole output end of the high-voltage direct-current circuit.
The step 1 of acquiring a first resistance value of the output end of the component to be detected and a second resistance value of the output end of the high-voltage direct-current circuit comprises the following steps:
when the first resistance value and the second resistance value are collected, the first resistance value and the second resistance value are detected through a megohmmeter, and then the first resistance value of the output end of the component to be detected and the second resistance value of the output end of the high-voltage direct-current circuit are obtained.
And 2, determining the fault states of the component to be detected and the rest components of the high-voltage direct-current circuit according to the first resistance value and the second resistance value.
Preferably, step 2 comprises:
step 21, when the first resistance value is smaller than a first preset resistance value and the second resistance value is equal to the first preset resistance value, determining that the component to be detected is in a fault state and the rest components of the high-voltage direct-current circuit are not in the fault state; or
Step 22, when the first resistance value is equal to the first predetermined resistance value and the second resistance value is smaller than the first predetermined resistance value, determining that the component to be detected is not in a fault state and at least one of the remaining components of the high-voltage direct-current circuit is in a fault state; or
And step 23, when the first resistance value and the second resistance value are both smaller than the first preset resistance value, determining that at least one of the to-be-detected component and the rest of the high-voltage direct-current circuit is in a fault state.
If the first resistance value and the second resistance value are both equal to the first preset resistance value, the fact that the component to be detected and the rest components of the high-voltage direct-current circuit are not in fault is indicated.
Specifically, the first predetermined resistance value is the maximum resistance limit value of the megohmmeter, and in steps 21 to 23, the first resistance value is equal to the first predetermined resistance value, which indicates that the component to be detected in the open circuit state has good performance and no fault; the first resistance value is smaller than a first preset resistance value, which indicates that the part to be detected in the short circuit state has a fault; the second resistance value is equal to the first predetermined resistance value indicating that the remaining components are not malfunctioning, and the second resistance value is less than the first predetermined resistance value indicating that at least one of the remaining components is malfunctioning.
If the obtained result is the result in step 22 or step 23 according to the first resistance value and the second resistance value in step 1, the remaining components need to be checked one by one, and when the remaining components are checked one by one, the same method as the method in step 1 and step 2 is used, and the description is omitted here.
When the part to be detected is a power battery, the step 1 comprises the following steps:
it should be noted that, when the component to be detected is a power battery, in step 1, the step of acquiring the first resistance value of the output end of the component to be detected includes:
and acquiring a first resistance value of the output end of the power battery when the connection between the power battery and the rest parts of the high-voltage direct-current circuit is in a disconnected state and the connection between the power battery and the external power supply is in a connected state.
Here, this external power supply is used for providing enable signal to power battery, because the connection between power battery and the surplus part of high voltage direct current circuit is in the off-state, and the 12V battery on the car can't provide enable signal for power battery again, consequently, need rely on an external power supply to make power battery be in after the enable state, just can gather the first resistance value of power battery's output.
When the part to be detected is other parts except the power battery, the corresponding part to be detected and the rest parts are in a disconnected state.
Through the step 1 and the step 2, whether each component in the high-voltage direct-current circuit has a fault or not can be determined one by one, and the fault detection precision of the high-voltage direct-current circuit is ensured.
Referring to fig. 2, preferably, the method further comprises:
step 3, acquiring a third resistance value of the output end of the high-voltage direct-current circuit when the connection of at least two components in the high-voltage direct-current circuit is in a connected state;
and 4, determining the fault state of the high-voltage direct-current circuit according to the third resistance value.
And step 3 and step 4 are arranged for determining whether the high-voltage direct current circuit has a fault. When fault detection is carried out on the high-voltage direct-current circuit, the fault detection can be carried out in the following modes: firstly, executing the step 3 and the step 4, and if the fault state of the high-voltage direct-current circuit is determined to be the non-fault state according to the third resistance value obtained in the step 3, at this time, executing the step 1 and the step 2 is not needed; the result obtained in step 4 indicates that the fault state of the high voltage dc circuit is a fault state, and step 1 and step 2 need to be performed. Or, directly carrying out fault detection on the components in the high-voltage direct-current circuit through the step 1 and the step 2.
Referring to fig. 3, step 3 includes:
step 31, acquiring a first voltage value of a first output end of the high-voltage direct-current circuit and a second voltage value of a second output end of the high-voltage direct-current circuit when a resistor connected in parallel with the first output end of the high-voltage direct-current circuit and the first output end of the high-voltage direct-current circuit are in a disconnected state;
step 32, acquiring a third voltage value of the first output end of the high-voltage direct-current circuit when the connection between the resistor connected in parallel with the first output end of the high-voltage direct-current circuit and the first output end of the high-voltage direct-current circuit is in a connected state;
and step 33, obtaining the third resistance value according to the first voltage value, the second voltage value and the third voltage value.
In step 33, the obtained third resistance value is the resistance of the second output terminal of the hvdc circuit, and in the embodiment of the present invention, when the connection between the resistance and the first output terminal of the hvdc circuit is in the disconnected state, it is default that the first voltage value of the first output terminal of the hvdc circuit is greater than the second voltage value of the second output terminal of the hvdc circuit.
Specifically, the acquisition of the first voltage value, the second voltage value and the third voltage value is collected by an ohmmeter.
Preferably, step 33 comprises:
by the formula:
obtaining the third resistance value RiWherein R is0Is the resistance value of the resistor, U1Is the first voltage value, U1' is said second voltage value, U2Is the third voltage value.
Resistance value R of resistor0Is a known value. In the embodiment of the invention, the default is the first voltage value U of the first output end of the high-voltage direct-current circuit1A second voltage value U greater than the second output terminal1’。
Preferably, step 4 comprises:
and 41, when the third resistance value is smaller than a second preset resistance value, determining that the high-voltage direct current circuit is in a fault state.
Here, the second predetermined resistance value is a minimum insulation resistance value of the high voltage direct current circuit required by the entire vehicle, and the second predetermined resistance value is smaller than the first predetermined resistance value. In particular, the second predetermined resistance value RimaxThe values of (A) are:
Rimax＝500*(U1′+U1)
wherein, U1Is a first voltage value, U1' is a second voltage value.
By the method, whether the high-voltage direct-current circuit has a fault or not can be judged, and when the high-voltage direct-current circuit has the fault, the specific component with the fault can be accurately determined.
Referring to fig. 4, according to another aspect of the embodiment of the present invention, there is further provided a high voltage dc circuit, including:
a controller 1;
at least two parts of mutual parallel connection all are equipped with a first control switch 2 on each part place branch, controller 1 is connected with the first control switch 2 that at least two parts correspond respectively, two at least parts include: at least two of a power battery, a motor controller, a DC/DC controller, a vehicle-mounted charger, a thermistor controller and a compressor controller;
the controller 1 is used for controlling the first control switch 2 of the branch where the component to be detected is located to be disconnected when one of the at least two components is determined as the component to be detected, so that the connection between the component to be detected and the rest of the at least two components is in a disconnected state;
acquiring a first resistance value of an output end of a component to be detected and a second resistance value of an output end of a high-voltage direct-current circuit;
and determining the fault states of the component to be detected and the rest components of the high-voltage direct-current circuit according to the first resistance value and the second resistance value. When the high-voltage direct current circuit is detected, firstly, whether the high-voltage direct current circuit fails or not is determined through the steps 3 and 4, and if the high-voltage direct current circuit fails according to the obtained third resistance value, the fault detection of the high-voltage direct current circuit is stopped; if the fault of the high-voltage direct-current circuit is determined according to the obtained third resistance value, each of the at least two components needs to be detected in sequence, and when each of the at least two components is detected, if the result in the step 21 is obtained according to the first resistance value of the output end of the component to be detected and the second resistance value of the output end of the circuit formed by the rest components, the detection is stopped; if the result in step 22 or step 23 is obtained, then steps 1 and 2 need to be continued until all failed components are determined.
Preferably, referring to fig. 4, the high voltage dc circuit further includes:
the external power supply 3 is connected with the power battery and used for providing an enabling signal for the power battery, the external power supply 3 is connected with the power battery through a second control switch 4, and the second control switch 4 is connected with the controller 1;
the controller 1 is further specifically configured to: when the component to be detected is determined to be the power battery, controlling the second control switch 4 to be closed, enabling the connection between the power battery and the external power supply 3 to be in a communication state, and obtaining a first resistance value of the output end of the power battery and a second resistance value of the output end of the high-voltage direct-current circuit after the power battery is communicated with the external power supply 3;
and determining the fault states of the power battery and the rest parts of the high-voltage direct-current circuit according to the first resistance value and the second resistance value.
When the component to be detected is a power battery, the first control switch 2 of the branch where the power battery is located is turned off, so that the 12V storage battery on the automobile for sending the enable signal to the power battery cannot send the enable signal to the power battery any more, and in order to complete detection of the resistance value of the output end of the power battery, the enable signal needs to be provided to the power battery through an external power supply 3. Preferably, the controller is further configured to:
and controlling the connection of the first control switches 2 corresponding to the at least two components to be closed, so that the connection between the at least two components is in a communicated state, acquiring a third resistance value of the output ends of the at least two components, and determining the fault state of the high-voltage direct-current circuit according to the third resistance value.
Here, the first control switches 2 corresponding to at least two components are controlled to be closed, that is, the high-voltage direct current circuit is ensured to maintain a pass state, so as to realize the detection of the step 3 and the step 4.
Preferably, referring to fig. 4, the high voltage dc circuit further includes:
the resistor 5 is connected with the first output end of the high-voltage direct-current circuit in parallel, the resistor 5 is connected with the first output end of the high-voltage direct-current circuit through a third control switch 6, and the third control switch 6 is connected with the controller 1;
the controller 1 is further configured to:
controlling the third control switch 6 to be switched off, so that the connection between the resistor 5 and the first output end of the high-voltage direct-current circuit is in a disconnected state, and acquiring a first voltage value of the first output end of the high-voltage direct-current circuit and a second voltage value of the second output end of the high-voltage direct-current circuit;
controlling the third control switch 6 to be closed, so that the connection between the resistor 5 and the first output ends of the at least two components is in a connected state, and acquiring a third voltage value of the first output end of the high-voltage direct-current circuit; and obtaining the third resistance value according to the first voltage value, the second voltage value and the third voltage value.
Specifically, in fig. 4, the high-voltage dc circuit further includes a motor connected to the motor controller, the motor is connected to the motor controller through a fourth control switch 7, and the fourth control switch 7 is connected to the controller 1. In the embodiment of the present invention, the first control switch 2 and the fourth control switch 7 of the branch where the motor controller is located may be turned off, and whether the output end of the motor controller fails or not may be determined by detecting the resistance value of the output end of the motor controller.
Through the high-voltage direct-current circuit provided by the embodiment of the invention, the fault detection of the high-voltage direct-current circuit can be realized, and when the high-voltage direct-current circuit breaks down, the specific component which breaks down can be accurately determined. The detection time of the high-voltage direct-current circuit is shortened, and the detection efficiency is ensured.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method of fault detection for a high voltage dc circuit, comprising:
acquiring a third resistance value of the output end of the high-voltage direct-current circuit when the connection between at least two components in the high-voltage direct-current circuit is in a connected state;
determining the fault state of the high-voltage direct-current circuit according to the third resistance value;
if the fault state of the high-voltage direct-current circuit is the fault state, acquiring a first resistance value of the output end of the component to be detected and a second resistance value of the output end of the high-voltage direct-current circuit when the connection between the component to be detected and the rest components of the high-voltage direct-current circuit is in a disconnection state;
and determining the fault states of the component to be detected and the rest components of the high-voltage direct-current circuit according to the first resistance value and the second resistance value.
2. The method according to claim 1, wherein the step of obtaining the first resistance value of the output terminal of the component to be detected and the second resistance value of the output terminal of the high voltage dc circuit comprises:
and detecting the first resistance value and the second resistance value through a megger to obtain a first resistance value of the output end of the component to be detected and a second resistance value of the output end of the high-voltage direct-current circuit.
3. The method according to claim 1, wherein the step of determining the fault status of the component to be tested and the remaining components of the HVDC circuit based on the first resistance value and the second resistance value comprises:
when the first resistance value is smaller than a first preset resistance value and the second resistance value is equal to the first preset resistance value, determining that the component to be detected is in a fault state and the rest components of the high-voltage direct-current circuit are not in the fault state; or
When the first resistance value is equal to the first preset resistance value and the second resistance value is smaller than the first preset resistance value, determining that the component to be detected is not in a fault state and at least one of the rest components of the high-voltage direct-current circuit is in a fault state; or
And when the first resistance value and the second resistance value are both smaller than the first preset resistance value, determining that at least one of the component to be detected and the rest of the high-voltage direct-current circuit is in a fault state.
4. The method according to claim 1, wherein the step of obtaining the first resistance value of the output terminal of the component to be detected when the component to be detected is a power battery comprises:
and acquiring a first resistance value of the output end of the power battery when the connection between the power battery and the rest parts of the high-voltage direct-current circuit is in a disconnected state and the connection between the power battery and the external power supply is in a connected state.
5. The method according to claim 1, wherein the step of obtaining the third resistance value at the output of the HVDC circuit comprises:
acquiring a first voltage value of a first output end of the high-voltage direct-current circuit and a second voltage value of a second output end of the high-voltage direct-current circuit when a resistor connected in parallel with the first output end of the high-voltage direct-current circuit is disconnected with the first output end of the high-voltage direct-current circuit;
acquiring a third voltage value of the first output end of the high-voltage direct-current circuit when a resistor connected in parallel with the first output end of the high-voltage direct-current circuit is connected with the first output end of the high-voltage direct-current circuit in a connected state;
and obtaining the third resistance value according to the first voltage value, the second voltage value and the third voltage value.
6. The method according to claim 5, wherein the step of obtaining the third resistance value according to the first voltage value, the second voltage value, and the third voltage value comprises:
by the formula:
obtaining the third resistance value RiWherein R is0Is the resistance value of the resistor, U1Is the first voltage value, U1' is said second voltage value, U2Is the third voltage value.
7. The method according to claim 6, wherein the step of determining the fault state of the HVDC circuit according to the third resistance value comprises:
and when the third resistance value is smaller than a second preset resistance value, determining that the high-voltage direct current circuit is in a fault state.
8. A high voltage dc circuit, comprising:
a controller;
at least two parts of interconnect parallel connection all are equipped with a first control switch on each part place branch, the controller is connected with the first control switch that at least two parts correspond respectively, two at least parts include: at least two of a power battery, a motor controller, a DC/DC controller, a vehicle-mounted charger, a thermistor controller and a compressor controller;
the controller is used for controlling the first control switch of the branch where the part to be detected is located to be disconnected when one of the at least two parts is determined as the part to be detected, so that the part to be detected and the rest parts of the at least two parts are in a disconnected state;
acquiring a first resistance value of an output end of a component to be detected and a second resistance value of an output end of a high-voltage direct-current circuit;
determining the fault states of the component to be detected and the rest components of the high-voltage direct-current circuit according to the first resistance value and the second resistance value;
the controller is further configured to:
and controlling the connection of the first control switches respectively corresponding to the at least two components to be closed, so that the connection between the at least two components is in a communicated state, acquiring a third resistance value of the output ends of the at least two components, and determining the fault state of the high-voltage direct-current circuit according to the third resistance value.
9. The hvdc circuit of claim 8, further comprising:
the external power supply is connected with the power battery and used for providing an enabling signal for the power battery, the external power supply is connected with the power battery through a second control switch, and the second control switch is connected with the controller;
the controller is further specifically configured to: when the component to be detected is determined to be the power battery, controlling the second control switch to be closed, enabling the connection between the power battery and the external power supply to be in a communicated state, and obtaining a first resistance value of the output end of the power battery and a second resistance value of the output end of the high-voltage direct-current circuit after the power battery is communicated with the external power supply;
and determining the fault states of the power battery and the rest parts of the high-voltage direct-current circuit according to the first resistance value and the second resistance value.
10. The hvdc circuit of claim 8, further comprising:
the resistor is connected with the first output end of the high-voltage direct-current circuit in parallel, and is connected with the first output end of the high-voltage direct-current circuit through a third control switch which is connected with the controller;
the controller is further configured to:
controlling the third control switch to be disconnected, wherein the connection between the resistor and the first output end of the high-voltage direct-current circuit is in a disconnected state, and acquiring a first voltage value of the first output end of the high-voltage direct-current circuit and a second voltage value of the second output end of the high-voltage direct-current circuit;
controlling the third control switch to be closed, so that the connection between the resistor and the first output ends of the at least two components is in a connected state, and acquiring a third voltage value of the first output end of the high-voltage direct-current circuit;
and obtaining the third resistance value according to the first voltage value, the second voltage value and the third voltage value.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710756880.9A CN107656186B (en) | 2017-08-29 | 2017-08-29 | Detection method of high-voltage direct-current circuit and high-voltage direct-current circuit |
| PCT/CN2018/100599 WO2019042127A1 (en) | 2017-08-29 | 2018-08-15 | Fault detection method for high-voltage direct current circuit and high-voltage direct current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710756880.9A CN107656186B (en) | 2017-08-29 | 2017-08-29 | Detection method of high-voltage direct-current circuit and high-voltage direct-current circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107656186A CN107656186A (en) | 2018-02-02 |
| CN107656186B true CN107656186B (en) | 2020-02-07 |
Family
ID=61128729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710756880.9A Active CN107656186B (en) | 2017-08-29 | 2017-08-29 | Detection method of high-voltage direct-current circuit and high-voltage direct-current circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107656186B (en) |
| WO (1) | WO2019042127A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656186B (en) * | 2017-08-29 | 2020-02-07 | 北京新能源汽车股份有限公司 | Detection method of high-voltage direct-current circuit and high-voltage direct-current circuit |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201697786U (en) * | 2009-12-18 | 2011-01-05 | 湖南南车时代电动汽车股份有限公司 | Insulation testing device for electric automobile |
| CN201979256U (en) * | 2010-12-23 | 2011-09-21 | 赵华良 | Detection and repair instrument for dobby electromagnet |
| CN103018614B (en) * | 2011-09-23 | 2017-11-28 | 中兴通讯股份有限公司 | A kind of DC system insulating monitoring method and its equipment |
| CN103399571B (en) * | 2013-07-31 | 2015-09-23 | 东方电气集团东风电机有限公司 | For pick-up unit and the method for electric vehicle motor controller high tension loop |
| CN203658468U (en) * | 2013-12-03 | 2014-06-18 | 北汽福田汽车股份有限公司 | Insulation resistance detection device used for electric vehicle |
| CN203941235U (en) * | 2014-07-04 | 2014-11-12 | 桂林电子科技大学 | A kind of power battery of pure electric automobile insulation resistance is at line detection circuit |
| KR20160069800A (en) * | 2014-12-09 | 2016-06-17 | 현대오트론 주식회사 | Apparatus and method for detecting leakage current of battery management system |
| CN206287836U (en) * | 2016-08-25 | 2017-06-30 | 北京汽车股份有限公司 | The high-voltage safety monitoring system of electric automobile |
| CN106645964B (en) * | 2016-12-30 | 2020-10-30 | 潍柴动力股份有限公司 | Insulation test method, main controller and insulation tester |
| CN107656186B (en) * | 2017-08-29 | 2020-02-07 | 北京新能源汽车股份有限公司 | Detection method of high-voltage direct-current circuit and high-voltage direct-current circuit |
-
2017
- 2017-08-29 CN CN201710756880.9A patent/CN107656186B/en active Active
-
2018
- 2018-08-15 WO PCT/CN2018/100599 patent/WO2019042127A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN107656186A (en) | 2018-02-02 |
| WO2019042127A1 (en) | 2019-03-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11073559B2 (en) | Electrical system and method for diagnosing the functionality of power relays in an electrical system | |
| US9114715B2 (en) | Electronic control unit | |
| CN105137336B (en) | Detect the diagnostic method of electric automobile high-voltage relay failure | |
| CN110907853B (en) | Load state detection circuit and method | |
| US7586214B2 (en) | High voltage energy storage connection monitoring system and method | |
| CN114325412B (en) | A detection circuit, method and device | |
| CN102751748B (en) | Charging system for electric vehicle | |
| US10416234B2 (en) | Diagnosis system for vehicular DC charging relay | |
| KR101806996B1 (en) | State diagnosis apparatus and method for relay drive circuit | |
| CN211151975U (en) | Vehicle-mounted Ethernet testing device | |
| US9533578B2 (en) | Electronic control unit | |
| KR20170097481A (en) | Charging or discharging system and method for diagnosing state of contactor | |
| CN105527535A (en) | DC leakage insulation detection system and method based on variable-resistor network | |
| CN111193296B (en) | Pre-charging control device and method | |
| CN105667430B (en) | A kind of starting control device, system and method | |
| CN104142475B (en) | A kind of insulation monitoring module evaluating apparatus and method | |
| KR101486626B1 (en) | Apparatus for detecting insulation resestance and diagnostic apparatus thereof | |
| CN105322601A (en) | Battery system | |
| CN111812492A (en) | Battery management system and relay diagnostic device | |
| CN110967557A (en) | Detection circuit and method | |
| CN110031753A (en) | Quick charging system welding detection | |
| US20130099739A1 (en) | Electronic control unit | |
| CN110520746A (en) | Battery Electromechanical Switchgear Diagnostic System and Method | |
| CN204895155U (en) | Circuit, electric automobile control system and electric automobile on electric automobile high pressure | |
| KR20210002971A (en) | Device for ground fault detection of electric car charger and method for the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |