CN213750089U - Vehicle-mounted power supply insulation detection device - Google Patents
Vehicle-mounted power supply insulation detection device Download PDFInfo
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- CN213750089U CN213750089U CN202022120138.9U CN202022120138U CN213750089U CN 213750089 U CN213750089 U CN 213750089U CN 202022120138 U CN202022120138 U CN 202022120138U CN 213750089 U CN213750089 U CN 213750089U
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Abstract
The utility model discloses a vehicle mounted power supply insulation detection device, including interconnect's insulation detector circuit and CAN transceiver circuit, insulation detector injects pulse signal between vehicle mounted automobile battery system's direct current generating line and vehicle chassis, pulse signal passes through current-limiting resistor cluster, sampling resistor and awaits measuring anodal insulation resistance to ground, await measuring negative pole insulation resistance to ground and constitutes the return circuit, insulation detector handles the voltage signal on the sampling resistor and obtains the measuring resistance value of awaiting measuring anodal insulation resistance to ground, awaiting measuring negative pole insulation resistance to ground; and the CAN transceiver circuit for measuring the resistance value of the anode to-ground insulation resistor and the cathode to-ground insulation resistor is transmitted to the monitoring platform.
Description
Technical Field
The utility model relates to an insulation resistance's measurement technical field specifically is an on-vehicle power supply insulation detection device.
Background
With the increasing energy crisis and environmental pollution, the development of high-efficiency, energy-saving and zero-emission clean electric vehicles becomes a necessary trend for the development of the automobile industry at home and abroad. With the requirement for protection against human electric shock in the national standard GB/T18384.3-2015, all electric vehicle manufacturers have regarded the insulation safety performance of high voltage power battery packs as an important factor.
A group of power storage batteries are used as an energy storage device in a high-voltage system of the electric automobile. In order to ensure the safe operation of the vehicle, a special detection device must be designed to perform real-time online monitoring on the insulation resistance between the direct-current high-voltage system and the electric chassis.
In the prior art, most of reference is made to a measurement method recommended in a standard GB/T18384.1-2001 vehicle-mounted energy storage device 6.1 power storage battery insulation resistance 6.1.1 measurement method. The prior art has the following problems: the insulation fault between the inside of the power battery and the electric chassis cannot be responded, and the measurement circuit must be disconnected when the voltage withstanding test of the whole vehicle is carried out due to the influence of voltage withstanding of the measurement switch device. In the measuring process, a standard resistor with smaller resistance value needs to be incorporated, and the insulation of the whole vehicle is influenced to a certain extent.
China specially adapted for 2019, 2, 12 and the like, publication No. CN109324231A discloses a direct-current insulation resistance detection device for a battery pack of an electric vehicle, which comprises a signal loop, a pulse generation unit, a driving unit, a sampling unit, a processor and the like, wherein the pulse generation unit generates current, the current flows into the battery pack through a measured insulation resistance, and then flows back to the pulse generation unit through a diode, a current limiting resistance and a sampling resistance to form a current loop. And the sampling unit collects the voltage value on the sampling resistor and processes the signal. The processor outputs a pulse driving signal and chops a driving power supply into a pulse signal; and meanwhile, the processor receives the voltage signal of the sampling unit to perform analog/digital conversion, and finally, the equivalent resistance of the battery pack to the ground is calculated through the sampled voltage value. The application can realize the detection of the insulation resistance value to the ground at any position in the battery pack and the locking of the fault position, and has no influence on a vehicle body system.
Chinese proprietary publication No. CN201886083U, 6/29/2011 discloses a device for measuring insulation resistance of a dc high-voltage system for a vehicle, which is connected to a system to be measured, and the system to be measured includes a dc high-voltage system and an electric chassis; the measuring device comprises a measuring signal generator unit, a sampling resistor unit and an MCU control unit; the measuring signal generator unit and the sampling resistance unit are both connected with the MCU control unit, the output end of the measuring signal generator unit is connected with the electric chassis of the system to be measured, the measuring current generated by the measuring signal generator unit flows through the high-voltage system through the insulation resistor and the leakage capacitor, and flows back to the sampling resistance unit of the measuring device through the anode and the cathode of the high-voltage system; the MCU control unit performs A/D conversion on the voltage signal of the sampling resistor and calculates the size of the insulation resistor; the utility model discloses not only can respond the insulation fault that any position of high-voltage system appears, it is very little to the insulating influence of whole car moreover, when carrying out withstand voltage test to the whole car, need not break off measuring circuit.
Therefore, it is necessary to provide a vehicle-mounted power insulation detection device, which can reliably monitor the insulation resistance of the entire vehicle, and can transmit the fault information to the monitoring platform in real time during the detection process.
Disclosure of Invention
For overcoming the not enough of above-mentioned prior art, the utility model provides an on-vehicle power supply insulation detection device can reliably monitor the insulation resistance of whole car, and can give monitoring platform with fault information real-time transmission in the testing process.
The utility model discloses a realize through following technical scheme:
the insulation detection device of the vehicle-mounted power supply comprises an insulation detector circuit and a CAN transceiver circuit which are connected with each other, wherein a pulse signal is injected between a direct current bus of a vehicle-mounted automobile battery system and an automobile chassis by the insulation detector, the pulse signal forms a loop with a positive electrode ground insulation resistor to be detected and a negative electrode ground insulation resistor to be detected through a current limiting resistor string and a sampling resistor, and the insulation detector processes a voltage signal on the sampling resistor to obtain a measured resistance value of the positive electrode ground insulation resistor to be detected and the negative electrode ground insulation resistor to be detected; and the CAN transceiver circuit for measuring the resistance value of the anode to-ground insulation resistor and the cathode to-ground insulation resistor is transmitted to the monitoring platform.
As a further technical scheme, the insulation detector circuit converts the input voltage into a symmetrical pulse voltage measurement signal and outputs the signal.
As a further technical scheme, the circuit for outputting the pulse voltage measurement signal comprises a relay, a rectifier diode and an NPN type triode, wherein the relay is connected with the rectifier diode in parallel, an anode of the rectifier diode is connected with a collector of the NPN type triode, and an emitter of the NPN type triode is connected with a base through a ground capacitor.
As a further technical scheme, the relay adopts HFD3/12 model; the rectifier diode adopts a DL4007 model; the NPN type triode is of an S8050 model.
As a further technical scheme, the insulation detector circuit outputs two measuring resistors, namely a positive electrode insulation resistor to ground and a negative electrode insulation resistor to ground.
As a further technical scheme, the insulation detector circuit outputs a measuring resistor which is a parallel value of the positive electrode insulation resistor and the negative electrode insulation resistor to the ground.
As a further technical scheme, the current-limiting resistor string is connected with the sampling resistor through a high-voltage relay.
As a further technical solution, the CAN transceiver circuit is an isolated CNA transceiver and is implemented by using an ISO1050DW chip.
As a further technical scheme, the injected pulse signal is a low-frequency square wave pulse signal with positive and negative symmetry, and the amplitude is + 15V.
Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model provides a vehicle-mounted power supply insulation detection device is used for measuring insulation faults of a direct current side, an alternating current side, a motor side and the like; the asymmetric insulation fault and the symmetric insulation fault of the positive electrode and the negative electrode can be monitored simultaneously; the internal insulation fault of the battery pack can be monitored, and the fault point can be positioned; the method can be used for monitoring under the condition of short circuit on the high-voltage direct-current side, and can also be used for reliably monitoring the insulation resistance of the whole vehicle under the condition of high-strength interference such as acceleration, deceleration and energy recovery. During the detection process, fault information (insulation fault, overvoltage, self error and the like) CAN be output to the monitoring platform through the CAN bus interface.
Drawings
Fig. 1 is a circuit diagram of an insulation detection device for a vehicle-mounted power supply according to an embodiment of the present invention.
Fig. 2 is an insulation resistance measurement circuit schematic diagram according to an embodiment of the present invention.
Fig. 3 is according to the utility model discloses vehicle power supply insulation detection device's positive negative pole measures the sketch map to ground respectively.
Fig. 4 is according to the utility model discloses vehicle power supply insulation detection device's positive negative pole is parallelly connected to ground and is measured the schematic diagram.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Referring to fig. 1, a vehicle-mounted power insulation detection device is provided, which includes an insulation detector circuit and a CAN transceiver circuit that are connected to each other, the insulation detector injects a pulse signal between a dc bus of a vehicle-mounted vehicle battery system and a vehicle chassis, the pulse signal forms a loop with a positive electrode ground insulation resistor to be detected and a negative electrode ground insulation resistor to be detected through a current limiting resistor string, a sampling resistor, and the insulation detector processes a voltage signal on the sampling resistor to obtain a measured resistance value of the positive electrode ground insulation resistor to be detected and the negative electrode ground insulation resistor to be detected; and the CAN transceiver circuit for measuring the resistance value of the anode to-ground insulation resistor and the cathode to-ground insulation resistor is transmitted to the monitoring platform. The injected pulse signal is a low-frequency square wave pulse signal with positive and negative symmetry, and the amplitude is + 15V. The current-limiting resistor string is connected with the sampling resistor through a high-voltage relay. The CAN transceiver circuit is an isolated CNA transceiver and is realized by adopting an ISO1050DW chip.
And the insulation detector circuit converts the input voltage into a symmetrical pulse voltage measurement signal and outputs the symmetrical pulse voltage measurement signal.
The circuit for outputting the pulse voltage measurement signal comprises a relay, a rectifier diode and an NPN type triode, wherein the relay is connected with the rectifier diode in parallel, the anode of the rectifier diode is connected with the collector of the NPN type triode, and the emitter of the NPN type triode is connected with the base through a grounding capacitor. The relay is in HFD3/12 type; the rectifier diode adopts a DL4007 model; the NPN type triode is of an S8050 model.
The insulation detector circuit outputs two measuring resistors, namely a positive electrode insulation resistor to ground and a negative electrode insulation resistor to ground. Or the insulation detector circuit outputs a measuring resistor which is a parallel value of the positive electrode insulation resistor and the negative electrode insulation resistor to the ground.
Examples
Referring to fig. 2, the insulation detecting device generates a low-frequency square wave pulse signal with positive and negative symmetry and an amplitude of + 15V. Pulse signals are injected between a direct current bus of a vehicle-mounted automobile battery system and an automobile chassis (the ground), and the pulse signals form a loop with a positive pole earth insulation resistor Rso + and a negative pole earth insulation resistor Rso-to-be-detected through a current limiting resistor string Rx and a sampling resistor Rs. By using a real-time sampling signal on the Rs, the insulation resistance value Riso +, Riso-Rioo of the system to be tested to the automobile chassis (earth) can be obtained through an MCU algorithm.
Referring to fig. 3 to 4, the insulation resistor has two output modes: an output positive electrode and a negative electrode respectively have ground insulation resistance values Riso + and Riso-; a parallel value Riso of the insulation resistance of the positive pole and the negative pole to the ground is output. Riso + and Riso-, respectively indicate the insulation resistance value of the positive electrode BUS + of the battery pack to the automobile chassis (earth) and the negative electrode BUS-of the battery pack to the automobile chassis (earth), so that the insulation faults of the positive electrode and the negative electrode to the earth can be conveniently distinguished.
The parallel value Riso of the positive and negative pole insulation resistance to ground refers to the parallel value of all insulation resistances, and the fault grounding position is represented by voltages V1 and V2: v1 is the voltage of the positive electrode BUS + of the battery pack at the butt joint point, V2 is the voltage of the ground point to the negative electrode BUS-of the battery pack, and V1+ V2 is the direct current voltage value Vdc of the battery pack. The position of the insulation fault point in the battery pack can be quickly searched and determined by reading the data of the V1 during measurement.
In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the essence of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The vehicle-mounted power supply insulation detection device is characterized by comprising an insulation detector circuit and a CAN transceiver circuit which are mutually connected, wherein a pulse signal is injected between a direct current bus of a vehicle-mounted automobile battery system and an automobile chassis by the insulation detector, the pulse signal forms a loop with a positive electrode ground insulation resistor to be detected and a negative electrode ground insulation resistor to be detected through a current limiting resistor string and a sampling resistor, and the insulation detector processes a voltage signal on the sampling resistor to obtain a measurement resistance value of the positive electrode ground insulation resistor to be detected and the negative electrode ground insulation resistor to be detected; and the CAN transceiver circuit for measuring the resistance value of the anode to-ground insulation resistor and the cathode to-ground insulation resistor is transmitted to the monitoring platform.
2. The vehicle-mounted power insulation detection device according to claim 1, wherein the insulation detector circuit converts an input voltage into a symmetrical pulse voltage measurement signal and outputs the signal.
3. The vehicle-mounted power insulation detection device according to claim 2, wherein the circuit for outputting the pulse voltage measurement signal comprises a relay, a rectifier diode and an NPN type triode, the relay is connected with the rectifier diode in parallel, an anode of the rectifier diode is connected with a collector of the NPN type triode, and an emitter of the NPN type triode is connected with a base through a grounding capacitor.
4. The vehicle-mounted power insulation detection device according to claim 3, wherein the relay is of HFD3/12 type; the rectifier diode adopts a DL4007 model; the NPN type triode is of an S8050 model.
5. The vehicle-mounted power insulation detection device according to claim 1, wherein the insulation detector circuit outputs two measuring resistors, namely a positive electrode insulation resistor to ground and a negative electrode insulation resistor to ground.
6. The vehicle-mounted power insulation detection device according to claim 1, wherein the insulation detector circuit outputs a measurement resistor which is a parallel connection value of the positive and negative insulation resistors to the ground.
7. The vehicle-mounted power insulation detection device according to claim 1, wherein the current limiting resistor string is connected with the sampling resistor through a high-voltage relay.
8. The vehicle-mounted power insulation detection device according to claim 1, wherein the CAN transceiver circuit is an isolated CNA transceiver and is implemented by using an ISO1050DW chip.
9. The vehicle-mounted power insulation detection device according to claim 1, wherein the injected pulse signal is a low-frequency square wave pulse signal with positive and negative symmetry and has an amplitude of + 15V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022120138.9U CN213750089U (en) | 2020-09-24 | 2020-09-24 | Vehicle-mounted power supply insulation detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022120138.9U CN213750089U (en) | 2020-09-24 | 2020-09-24 | Vehicle-mounted power supply insulation detection device |
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| CN213750089U true CN213750089U (en) | 2021-07-20 |
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