Test device and test method

Abstract

The application relates to the technical field of detection, in particular to a testing device and a testing method. The testing device comprises one or more voltage collectors and a first control circuit. The voltage collector is used for coupling the output end of a driving circuit, and the output end of the driving circuit is used for coupling a motor. The voltage collector is configured to collect the voltage of the output end of the driving circuit after the device where the driving circuit is located collides. The first control circuit is configured to determine that the control strategy of the driving circuit meets a target control strategy when the voltage is less than a preset voltage threshold. The technical scheme can collect alternating current side voltage and electric energy for testing, and solves the problem that an integrated circuit cannot detect direct current bus voltage.

Description

Technical Field

[0001] This application relates to the field of testing technology, and in particular to a testing device and a testing method. Background Technology

[0002] Crash testing refers to testing the safety performance of equipment by simulating collision conditions. For example, testing whether there is a risk of electric shock some time after a vehicle collision.

[0003] In related technologies, the voltage of the DC bus connected to the battery pack is detected some time after a vehicle collision. If the DC bus voltage is lower than the safe voltage, the vehicle is considered to have passed the collision test. However, for highly integrated circuits, the battery pack and inverter circuit are integrated into a single high-voltage module. Current testing devices cannot acquire the voltage on the DC bus between the battery pack and the inverter circuit, thus failing to perform the testing function. Summary of the Invention

[0004] The purpose of this application is to provide a testing device and a testing method, which aims to provide a technical solution that can collect AC side voltage and electrical energy for testing, and solve the problem that integrated circuits cannot detect DC bus voltage.

[0005] In a first aspect, a testing apparatus is provided, comprising one or more voltage acquisition units and a first control circuit. The voltage acquisition units are used to couple to the output terminal of a drive circuit, and the output terminal of the drive circuit is used to couple to a motor. The voltage acquisition units are configured to acquire the voltage at the output terminal of the drive circuit after a collision occurs in the device containing the drive circuit. The first control circuit is configured to determine that the control strategy for the drive circuit satisfies the target control strategy if the voltage is less than a preset voltage threshold.

[0006] The technical solution provided in this application enables AC side voltage testing via a voltage acquisition device. For example, it allows for voltage testing on the AC bus of the drive circuit outside the battery pack, accurately measuring the AC side voltage and solving the problem of difficult DC bus side testing of integrated circuits. This also ensures the reliability and accuracy of the test. Furthermore, the use of multiple high-precision AC voltage acquisition devices improves the voltage measurement accuracy and testing range, further enhancing the reliability and accuracy of the test.

[0007] In one embodiment, the driving circuit includes a first output terminal and a second output terminal. The voltage acquisition unit is specifically configured to acquire the voltages of the first and second output terminals after a collision occurs in the device containing the driving circuit.

[0008] The first control circuit is further configured to: calculate the voltage between the first output terminal and the second output terminal based on the voltage at the first output terminal and the voltage at the second output terminal. If the voltages at the first output terminal, the second output terminal, and the voltage between the first and second output terminals are less than a preset voltage threshold, it is determined that the control strategy for the drive circuit meets the target control strategy. Simultaneously, by using both the voltage at the output terminal and the voltage between the output terminals for this determination, the result is more accurate.

[0009] In one embodiment, the voltage acquisition device includes: a first-phase voltage acquisition device and a second-phase voltage acquisition device. A first terminal of the first-phase voltage acquisition device is coupled to a first output terminal, and a second terminal of the first-phase voltage acquisition device is coupled to a ground terminal, for acquiring the voltage of the first output terminal. A first terminal of the second-phase voltage acquisition device is coupled to a second output terminal, and a second terminal of the second-phase voltage acquisition device is coupled to a ground terminal, for acquiring the voltage of the second output terminal.

[0010] In one embodiment, the voltage acquisition unit further includes a line voltage acquisition unit. The line voltage acquisition unit is coupled between the first output terminal and the second output terminal and is used to acquire the voltage between the first output terminal and the second output terminal. Directly acquiring the voltage between multiple output terminals via the line voltage acquisition unit reduces the complexity of calculations.

[0011] In one embodiment, the testing apparatus provided in this application further includes one or more energy harvesters. The energy harvesters are coupled to the output terminal of the drive circuit and are configured to collect the electrical energy flowing through the human body when the human body contacts the output terminal of the drive circuit after a collision with the device containing the drive circuit. The first control circuit is specifically configured to determine that the control strategy for the drive circuit meets the target control strategy when the voltage is less than a preset voltage threshold and / or the electrical energy is less than a preset electrical energy threshold. Simultaneously using both voltage and electrical energy for determination further improves the accuracy of the test results.

[0012] In one embodiment, the energy harvester includes: a human body impedance simulation circuit, an analog circuit voltage harvester, an analog circuit current harvester, and a second control circuit. A first terminal of the human body impedance simulation circuit is coupled to the output terminal of a drive circuit, and a second terminal is coupled to a ground terminal. The analog circuit voltage harvester is coupled to the human body impedance simulation circuit and is used to detect the voltage difference across the human body impedance simulation circuit. The analog circuit current harvester is coupled to the human body impedance simulation circuit and is used to detect the current flowing through the human body impedance simulation circuit. The second control circuit is configured to: calculate the electrical energy flowing through the human body impedance simulation circuit based on the voltage difference across the human body impedance simulation circuit and the current flowing through the human body impedance simulation circuit, and use the electrical energy flowing through the human body impedance simulation circuit as the electrical energy flowing through the human body when the human body contacts the output terminal of the drive circuit. By simulating real human body impedance through the human body impedance simulation circuit, the repeatability and consistency are strong, effectively simulating the real risk of electric shock.

[0013] In one embodiment, the energy harvester includes: a human body simulated resistor, an analog circuit voltage harvester, and a second control circuit. A first end of the human body simulated resistor is coupled to the output terminal of a drive circuit, and a second end is coupled to a ground terminal. The analog circuit voltage harvester is coupled to the human body simulated resistor and is used to detect the voltage difference across the human body simulated resistor. The second control circuit is configured to: calculate the electrical energy flowing through the human body simulated resistor based on the voltage difference across the human body simulated resistor and the resistance value of the human body simulated resistor, and use the electrical energy of the human body simulated resistor as the electrical energy flowing through the human body when the human body contacts the output terminal of the drive circuit. By simulating the human body resistance using a human body simulated resistor with a known resistance value, an analog circuit current harvester is not needed; the electrical energy can be determined based on the voltage difference across the human body simulated resistor and the resistance value of the human body simulated resistor. The circuit structure is simple, and the calculation process is efficient and convenient. In one embodiment, the drive circuit includes multiple output terminals. The energy harvester is specifically configured to: after a collision with the device where the drive circuit is located, collect the electrical energy flowing through the human body after the human body simultaneously contacts multiple output terminals. Simultaneously, the accuracy of the test results is further improved by judging the electrical energy flowing out of the output terminals and the electrical energy between the output terminals.

[0014] In one embodiment, the measuring device provided in this application further includes: multiple switches. Each switch corresponds one-to-one with a plurality of energy harvesters, and the switches are coupled between the energy harvester and the output terminal of the drive circuit. A first control circuit is further configured to: upon reaching a preset measurement time or determining that the motor has stopped, control one or more of the multiple switches to close, so that one of the energy harvesters collects the electrical energy flowing through the human body when the human body contacts the output terminal of the drive circuit. The multiple switches can flexibly switch between different output terminals and the energy collection process, resulting in a high degree of automation and a more flexible and convenient testing process.

[0015] Secondly, a testing method is also provided, which is applied to the testing apparatus of any embodiment of the first aspect described above. The testing method includes: in response to a collision occurring in the device where the driving circuit is located, controlling a voltage acquisition unit to acquire the voltage at the output terminal of the driving circuit. If the voltage is less than a preset voltage threshold, it is determined that the control strategy for the driving circuit meets the target control strategy.

[0016] The technical solution provided in this application embodiment can achieve AC side voltage testing through a voltage acquisition device, solving the problem of difficult DC bus side testing of integrated circuits, and ensuring the reliability and accuracy of the test. Simultaneously, by using multiple high-precision AC voltage acquisition devices, the voltage measurement accuracy and testing range are improved, further enhancing the reliability and accuracy of the test.

[0017] In one embodiment, the testing method provided in this application further includes: in response to a collision occurring in the device where the drive circuit is located, controlling an energy harvester to collect the electrical energy flowing through the human body when the human body contacts the output terminal of the drive circuit. If the voltage is less than a preset voltage threshold, it is determined that the control strategy for the drive circuit meets the target control strategy. Specifically, this can be implemented as follows: if the voltage is less than a preset voltage threshold and / or the electrical energy is less than a preset electrical energy threshold, it is determined that the control strategy for the drive circuit meets the target control strategy.

[0018] Thirdly, a vehicle is provided that includes a test apparatus according to any embodiment of the first aspect above, or is subjected to a crash test using a test method according to any embodiment of the second aspect above. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This application provides a schematic diagram of the structure of a drive circuit and a motor according to an embodiment of the present application. Figure 2 This is a schematic diagram of the structure of a testing device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the circuit structure of a testing device provided in an embodiment of this application; Figure 4 A schematic diagram of the circuit structure of another testing device provided in the embodiments of this application; Figure 5 A schematic diagram of the circuit structure of another testing device provided in the embodiments of this application; Figure 6 A schematic diagram of the circuit structure of another testing device provided in the embodiments of this application; Figure 7 A schematic diagram of the circuit structure of another testing device provided in the embodiments of this application; Figure 8 A schematic diagram of the circuit structure of another testing device provided in the embodiments of this application; Figure 9 A flowchart illustrating a testing method provided in an embodiment of this application; Figure 10 This is a flowchart illustrating another testing method provided in an embodiment of this application.

[0021] Figure label: 100. Drive circuit; 10. Battery pack; 11. Inverter circuit; a. First bridge arm; b. Second bridge arm; c. Third bridge arm; Q1. First switch; Q2. Second switch; Q3. Third switch; Q4. Fourth switch; Q5. Fifth switch; Q6. Sixth switch; S1, negative contactor; S2, positive contactor; S3, pre-charge contactor; R1, pre-charge resistor; R2, positive to ground insulation resistance; R3, negative to ground insulation resistance; C1, positive to ground capacitance; C2, negative to ground capacitance; 200. Electric motor; 300. Testing equipment; a. First phase voltage acquisition unit; b. Second phase voltage acquisition unit; c. Third phase voltage acquisition unit; d. First line voltage acquisition unit; e. Second line voltage acquisition unit; f. Third line voltage acquisition unit; 400. First control circuit; 500. Energy harvester; A. Human body impedance simulation circuit; B. Analog circuit voltage acquisition device; C. Analog circuit current acquisition device; 51. First energy collector; 52. Second energy collector; 53. Third energy collector; 54. Fourth energy collector; 55. Fifth energy collector; 56. Sixth energy collector; K1, First switch; K2, Second switch; K3, Third switch; K4, Fourth switch; K5, Fifth switch; K6, Sixth switch; K7, Seventh switch; K8, Eighth switch; K9, Ninth switch. Detailed Implementation

[0022] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0023] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A and / or B" includes three combinations: A only, B only, and a combination of A and B.

[0024] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0025] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner. In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0026] This application provides a vehicle, also known as a means of transportation, mobile carrier, etc., including but not limited to sedans, sport utility vehicles (SUVs), trucks, electric vehicles, motorcycles, tricycles, driverless taxis, intelligent connected buses, autonomous logistics vehicles, electric trucks, electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), fuel cell vehicles (FCVs), autonomous vehicles, intelligent and connected vehicles (ICVs), driverless vehicles, special vehicles (such as ambulances, fire trucks, police cars, etc.), agricultural vehicles, mining vehicles, forestry vehicles, airport vehicles, etc., and this application does not impose specific limitations on them.

[0027] In some embodiments, the vehicle includes a drive circuit and a motor.

[0028] For example, please refer to Figure 1 The drive circuit 100 includes a battery pack 10 and an inverter circuit 11. The first and second terminals of the inverter circuit 11 are coupled to the battery pack 10, respectively. The output terminal of the inverter circuit 11 serves as the output terminal of the drive circuit 100 and is coupled to the motor 200. Specifically, the battery pack 10 outputs DC power to the inverter circuit 11 via a DC bus. The inverter circuit 11 converts the DC power output from the battery pack 10 into AC power required by the motor 200, controlling the speed and torque of the motor 200 through the AC power. The motor 200 converts electrical energy into mechanical energy, driving the vehicle's wheels to rotate.

[0029] For example, the battery pack 10 is integrated into a rechargeable electrical energy storage system (REESS). The REESS also includes a battery management system (BMS), a thermal management system, fuses, etc. The BMS can monitor parameters such as voltage, current, and temperature to achieve equalization management, safety protection, and fault diagnosis. Theoretically, in the event of a vehicle collision, the vehicle's collision sensors will detect the collision and send a collision signal to the vehicle controller and BMS. This will cause the vehicle controller and BMS to control the main relay inside the battery pack 10 to disconnect, stopping the battery pack 10 from outputting electrical energy, such as stopping the output to the inverter circuit 11. Simultaneously, the inverter circuit 11 will also control its internal switch to disconnect upon receiving the collision signal. However, due to problems such as parallel capacitor failure, controller malfunction (e.g., relay sticking and unable to disconnect), and high-voltage wiring harness damage, high-voltage components such as the drive circuit and motor may retain or leak a certain amount of voltage after a collision, potentially causing serious electric shock accidents. Therefore, during the vehicle development, testing, or application phase, it is necessary to use testing equipment to verify whether the vehicle's high-voltage system can eliminate the risk of electric shock in a timely and effective manner under the extreme condition of a collision, so as to ensure the safety of passengers and rescue personnel.

[0030] In related technologies, standards stipulate that the voltage of the high-voltage system must drop below the safe voltage within a certain time after a vehicle collision (e.g., within 5 seconds), such as the DC bus voltage needing to drop below 30V. The testing device detects the voltage of the DC bus connected to the battery pack some time after the collision. If the DC bus voltage is below the safe voltage, the control strategy for the battery pack (stopping power supply to the battery pack after the collision) is deemed to meet the requirements of the developed control strategy, and the collision test passes. However, for highly integrated REESS systems, where the battery pack and inverter circuit are integrated into a single high-voltage module (drive circuit, such as an integrated electric drive assembly or integrated intelligent powertrain), current testing devices cannot acquire the voltage on the DC bus between the battery pack and the inverter circuit, thus failing to perform the testing function.

[0031] Based on this, embodiments of this application provide a testing device and method capable of collecting AC side voltage and electrical energy, and performing collision testing based on the AC side voltage and electrical energy. Optionally, the testing device and method provided in embodiments of this application can be applied, in addition to vehicles, to the collision testing of equipment with high-voltage energy sources such as electric loaders, electric aircraft, fixed energy storage batteries, and automated robots.

[0032] In some embodiments, please refer to Figure 2 , Figure 2This is a schematic diagram of a testing device provided in an embodiment of this application. The testing device provided in this embodiment includes one or more voltage acquisition units 300 and a first control circuit 400. The voltage acquisition unit 300 is used to couple to the output terminal of the drive circuit 100, and the output terminal of the drive circuit 100 is used to couple to the motor 200. After a collision occurs in the device where the drive circuit 100 is located, the voltage acquisition unit 300 acquires the voltage at the output terminal of the drive circuit 100.

[0033] When the voltage is less than a preset voltage threshold, the first control circuit 400 determines that the control strategy for the drive circuit 100 meets the target control strategy.

[0034] The target control strategy is the control strategy that the equipment is expected to achieve under collision conditions during the equipment development or design process. For example, during vehicle development, it is expected that the vehicle will promptly shut off the main positive relay of the battery pack 10 and the switch in the inverter circuit 11 after a collision. If the main positive relay of the battery pack 10 and the switch in the inverter circuit 11 are shut off promptly, the output voltage of the drive circuit 100 should decrease to below a preset voltage threshold within a preset time after the collision.

[0035] Optionally, the preset duration can be a default value or a manually set value, which can be flexibly adjusted according to needs. For example, the preset duration can be set within the range of 5s-60s (or 10s-60s), allowing operators to flexibly set when the voltage collector 300 will collect voltage within 5s-60s after a vehicle collision. The preset voltage threshold can be a default value or a manually set value, such as 30V (rms).

[0036] Optionally, the voltage acquisition unit 300 includes synchronous sampling acquisition units, asynchronous sampling acquisition units, etc.

[0037] Optionally, the device in which the drive circuit 100 is located includes vehicles, automated robots, electric aircraft, stationary energy storage devices, etc.

[0038] In some embodiments, the output terminal of the drive circuit 100 is coupled to the stator winding of the motor 200. When the drive circuit 100 meets the target control strategy, the output voltage of the drive circuit 100 will also be higher than the preset voltage threshold due to the motor 200.

[0039] For example, when a vehicle collision occurs, although the inverter circuit 11 is switched off, cutting off the current from the battery 10, the vehicle's inertia causes the wheels to continue rotating, thus driving the rotor of the motor 200 connected to the wheels to continue rotating. Consequently, due to the law of electromagnetic induction, a voltage is induced in the stator windings of the motor 200. Therefore, after a vehicle collision, the generation of voltage in the motor 200 can be prevented by shorting multiple stator windings of the motor 200, triggering the active discharge circuit, and locking the wheels. When the output voltage of the drive circuit 100 is less than a preset voltage threshold, it can also be determined that the control strategies such as "short-circuiting the stator windings, triggering the active discharge circuit, and locking the wheels" meet the corresponding target control strategies, achieving the vehicle's development goals, and the collision test is passed.

[0040] In some embodiments, the driving circuit includes multiple output terminals, and multiple voltage acquisition devices acquire the voltage of the multiple output terminals respectively.

[0041] For example, the driving circuit includes a first output terminal, a second output terminal, and a third output terminal. The voltage acquisition unit acquires the voltages of the first, second, and third output terminals after a collision occurs in the device containing the driving circuit.

[0042] For example, the drive circuit includes a three-phase inverter circuit and a three-phase motor. Figure 3 As shown, the inverter circuit includes a first bridge arm a, a second bridge arm b, and a third bridge arm c. The motor includes a first winding L1, a second winding L2, and a third winding L3. The first and second ends of the first bridge arm a are coupled to the battery pack 10, and the third end of the first bridge arm a is coupled to the first winding L1. The third end of the first bridge arm a serves as the first output terminal of the drive circuit. The first and second ends of the second bridge arm b are coupled to the battery pack 10, and the third end of the second bridge arm b is coupled to the second winding L2. The third end of the second bridge arm b serves as the second output terminal of the drive circuit. The first and second ends of the third bridge arm c are coupled to the battery pack 10, and the third end of the third bridge arm c is coupled to the third winding L3. The third end of the third bridge arm c serves as the third output terminal of the drive circuit.

[0043] Among them, the third end of the first bridge arm a is the common connection end of the upper and lower half bridges in the first bridge arm a, the third end of the second bridge arm b is the common connection end of the upper and lower half bridges in the second bridge arm b, and the third end of the third bridge arm c is the common connection end of the upper and lower half bridges in the third bridge arm c.

[0044] Specifically, the first bridge arm a includes a first switch Q1 and a second switch Q2 connected in series, with the connection point of the first switch Q1 and the second switch Q2 serving as the third end of the first bridge arm a. The second bridge arm b includes a third switch Q3 and a fourth switch Q4 connected in series, with the connection point of the third switch Q3 and the fourth switch Q4 serving as the third end of the second bridge arm b. The third bridge arm c includes a fifth switch Q5 and a sixth switch Q6 connected in series, with the connection point of the fifth switch Q5 and the sixth switch Q6 serving as the third end of the third bridge arm c.

[0045] Optionally, the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, and the sixth switch Q6 include, but are not limited to, insulated gate bipolar transistors (IGBTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), and silicon carbide metal-oxide-semiconductor field-effect transistors (SiC MOSFETs).

[0046] Figure 3 The drive circuit also includes a positive contactor S2, a negative contactor S1, a pre-charge contactor S3, a pre-charge resistor R1, a positive-to-ground insulation resistance R2, a negative-to-ground insulation resistance R3, a positive-to-ground capacitor C1, and a negative-to-ground capacitor C2. When the positive contactor S2 and the negative contactor S1 are open, the battery pack 10 does not output power to the inverter circuit. The pre-charge contactor S3 and the pre-charge resistor R1 are used for pre-charging to avoid current surges. The positive-to-ground insulation resistance R2, the negative-to-ground insulation resistance R3, the positive-to-ground capacitor C1, and the negative-to-ground capacitor C2 are the insulation resistance and insulation capacitance of the DC bus connecting the battery pack 10 to the inverter circuit. These can also be manually set resistors and capacitors.

[0047] The voltage acquisition unit includes a first-phase voltage acquisition unit a, a second-phase voltage acquisition unit b, and a third-phase voltage acquisition unit c. The first terminal of the first-phase voltage acquisition unit a is coupled to the first output terminal, and the second terminal of the first-phase voltage acquisition unit a is coupled to the ground terminal, used to acquire the voltage at the first output terminal. The first terminal of the second-phase voltage acquisition unit b is coupled to the second output terminal, and the second terminal of the second-phase voltage acquisition unit b is coupled to the ground terminal, used to acquire the voltage at the third output terminal.

[0048] The first control circuit calculates the voltage between the first output terminal and the second output terminal, the voltage between the first output terminal and the third output terminal, and the voltage between the second output terminal and the third output terminal based on the voltages of the first output terminal, the second output terminal, and the third output terminal.

[0049] If the voltages at the first output terminal, the second output terminal, the third output terminal, the voltage between the first output terminal and the second output terminal, the voltage between the first output terminal and the third output terminal, and the voltage between the second output terminal and the third output terminal are all less than a preset voltage threshold, it is determined that the control strategy for the drive circuit meets the target control strategy.

[0050] In some embodiments, the voltage between the first output terminal and the second output terminal, the voltage between the first output terminal and the third output terminal, and the voltage between the second output terminal and the third output terminal are directly acquired by a voltage acquisition device.

[0051] For example, such as Figure 4 As shown, the voltage acquisition unit also includes a first line voltage acquisition unit d, a second line voltage acquisition unit e, and a third line voltage acquisition unit f. The first line voltage acquisition unit d is coupled between the first output terminal and the second output terminal, and is used to acquire the voltage between the first output terminal and the second output terminal. The second line voltage acquisition unit e is coupled between the first output terminal and the third output terminal, and is used to acquire the voltage between the first output terminal and the third output terminal. The third line voltage acquisition unit f is coupled between the first output terminal and the second output terminal, and is used to acquire the voltage between the second output terminal and the third output terminal.

[0052] In some embodiments, the testing apparatus provided in this application further includes one or more power collectors, which are used to couple to the output terminal of the drive circuit. For example... Figure 5 As shown, the power collector 500 is coupled to the output terminal of the drive circuit 100.

[0053] Among them, the power harvester collects the electrical energy flowing through the human body when the human body touches the output terminal of the drive circuit after a collision with the equipment where the drive circuit is located.

[0054] When the voltage is less than a preset voltage threshold and / or the electrical energy is less than a preset electrical energy threshold, the first control circuit determines that the control strategy for the drive circuit meets the target control strategy.

[0055] Optionally, the preset energy threshold can be a default value or a manually set value, such as 0.2 joules.

[0056] Optionally, whether the control strategy of the drive circuit meets the target control strategy can be determined by judging only whether the voltage is less than a preset voltage threshold, or by judging only whether the electrical energy is less than a preset electrical energy threshold, or by combining judging whether the voltage is less than a preset voltage threshold and whether the electrical energy is less than a preset electrical energy threshold. The determination method can be flexibly set according to user needs.

[0057] For example, such as Figure 6 As shown, the power harvester includes a human body impedance simulation circuit A, an analog circuit voltage harvester B, an analog circuit current harvester C, and a second control circuit. The first terminal of the human body impedance simulation circuit A is coupled to the output terminal of the drive circuit, and the second terminal of the human body impedance simulation circuit A is coupled to the ground terminal. The analog circuit voltage harvester B is coupled to the human body impedance simulation circuit A and is used to detect the voltage difference across the human body impedance simulation circuit A. The analog circuit current harvester C is coupled to the human body impedance simulation circuit A and is used to detect the current flowing through the human body impedance simulation circuit A.

[0058] Among them, the human body impedance simulation circuit A is an equivalent circuit that simulates the impedance characteristics of a real human body to current at different frequencies and under different conditions under laboratory conditions. For example, the human body impedance simulation circuit A includes a 1.5kΩ resistor, a 100kΩ resistor, and a 0.22μF capacitor. The 100kΩ resistor and the 0.22μF capacitor are connected in parallel to form a parallel network, and the 1.5kΩ resistor is connected in series with the parallel network.

[0059] Optionally, the analog circuit current acquisition device C includes a current transformer, a Hall effect current sensor, etc.

[0060] The second control circuit calculates the electrical energy flowing through the human body impedance simulation circuit based on the voltage difference across the circuit and the current flowing through it. This electrical energy is then used as the electrical energy flowing through the human body when the human body contact drive circuit is output. For example, the analog circuit voltage acquisition device B detects multiple voltage values ​​during the acquisition time, and the analog circuit current acquisition device C detects multiple current values ​​during the acquisition time. Since electrical energy is the integral of power over time, the power value is first calculated based on the multiple voltage and current values. Then, the power value is integrated with the acquisition time to calculate the electrical energy flowing through the human body impedance simulation circuit.

[0061] Optionally, the second control circuit is independent of the first control circuit, or the second control circuit and the first control circuit are the same control circuit. The second control circuit can also acquire the voltage collected by the voltage acquisition unit, and determine whether the control strategy for the drive circuit meets the target control strategy based on the voltage and power.

[0062] For example, the power harvester includes a human body analog resistor, an analog circuit voltage harvester, and a second control circuit. A first terminal of the human body analog resistor is coupled to the output of the drive circuit, and a second terminal is coupled to ground. The analog circuit voltage harvester is coupled to the human body analog resistor and is used to detect the voltage difference across the human body analog resistor. The human body analog resistor is a resistor with a known resistance value, such as a 500Ω or 575Ω resistor.

[0063] The second control circuit calculates the electrical energy flowing through the human body simulated resistor based on the voltage difference across the resistor and its resistance. This electrical energy is then used as the output energy flowing through the human body when the human body contacts the drive circuit. For example, the analog circuit voltage acquisition unit detects multiple voltage values ​​during the acquisition time. Since electrical energy is the integral of power over time, the power value is first calculated based on the multiple voltage values ​​and the resistance of the human body simulated resistor. Then, the power value is integrated with the acquisition time to calculate the electrical energy flowing through the human body impedance simulation circuit. Here, power value = voltage value. 2 / Resistance value.

[0064] In some embodiments, the driving circuit includes multiple output terminals, and multiple power acquisition circuits respectively acquire the power corresponding to the multiple output terminals.

[0065] For example, the driving circuit includes a first output terminal, a second output terminal, and a third output terminal. (As...) Figure 6 As shown, the energy harvester includes a first energy harvester 51, a second energy harvester 52, and a third energy harvester 53. The first energy harvester 51 collects the electrical energy flowing through the human body after the human body touches the first output terminal, the second energy harvester 52 collects the electrical energy flowing through the human body after the human body touches the second output terminal, and the third energy harvester 53 collects the electrical energy flowing through the human body after the human body touches the third output terminal.

[0066] In some embodiments, after a collision occurs in the device where the drive circuit is located, the power harvester collects the electrical energy flowing through the human body after the human body simultaneously contacts multiple output terminals.

[0067] For example, such as Figure 7 As shown, the energy harvester also includes a fourth energy harvester 54, a fifth energy harvester 55, and a sixth energy harvester 56. The fourth energy harvester 54 harvests the electrical energy flowing through the human body after the human body simultaneously contacts the first and second output terminals; the fifth energy harvester 55 harvests the electrical energy flowing through the human body after the human body simultaneously contacts the first and third output terminals; and the sixth energy harvester 56 harvests the electrical energy flowing through the human body after the human body simultaneously contacts the second and third output terminals.

[0068] In some embodiments, multiple energy collectors are each associated with the same number of switches. The switches are coupled between the energy collectors and the output terminals of the drive circuit. By controlling the on / off states of different switches, the energy collectors can be controlled to collect energy from the target objects.

[0069] For example, such as Figure 7 As shown, the first switch K1 is coupled between the first energy collector 51 and the output terminal of the drive circuit; the second switch K2 is coupled between the second energy collector 52 and the output terminal of the drive circuit; the third switch K3 is coupled between the third energy collector 53 and the output terminal of the drive circuit; the fourth switch K4 is coupled between the fourth energy collector 54 and the output terminal of the drive circuit; the fifth switch K5 is coupled between the fifth energy collector 55 and the output terminal of the drive circuit; and the sixth switch K6 is coupled between the sixth energy collector 56 and the output terminal of the drive circuit.

[0070] In some embodiments, multiple voltage collectors are each associated with the same number of switches. The switches are coupled between the voltage collectors and the output terminals of the drive circuit. By controlling the on / off states of different switches, the voltage collectors can be controlled to collect electrical energy from the target of the circuit.

[0071] In some embodiments, when a preset measurement time is reached or the motor is determined to stop, the first control circuit controls one or more of the multiple switches to close, so that one of the multiple energy collectors (or multiple voltage collectors) collects the electrical energy flowing through the human body when the human body contacts the output terminal of the drive circuit (or collects the voltage at the output terminal of the drive circuit).

[0072] For example, such as Figure 8 As shown, when the motor is stopped, only one energy harvester 500 is needed. The energy harvester 500 is connected to the first, second, and third output terminals of the drive circuit via the seventh switch K7, the eighth switch K8, and the ninth switch K9, respectively. When the motor is stopped, it does not generate electricity; the three windings of the motor are symmetrical and open-circuited. The energy (voltage) state of one of the multiple output terminals of the drive circuit can replace the energy (voltage) state of the other output terminals. Therefore, in... Figure 8 Simply close one of the seventh switch K7, the eighth switch K8, or the ninth switch K9.

[0073] Optionally, the preset measurement time can be a default value or a manually set value. For example, the switch corresponding to the voltage collector can be closed to collect voltage data 15 seconds after a vehicle collision, and the switch corresponding to the energy collector can be closed to collect energy data 20 seconds after a vehicle collision. The number of closed switches and the voltage and energy collectors used for measurement can be manually set according to user needs.

[0074] In some embodiments, the testing device provided in this application further includes a data acquisition line (for connecting the output terminal of the drive circuit, the testing device, and the vehicle ground), a data acquisition and recording circuit (for recording the data acquired by the testing device to ensure the integrity and accuracy of the data), a function panel (for setting test parameters, displaying test results, etc., such as setting the voltage and energy acquisition time), and a power supply (for supplying power to the testing device).

[0075] This application also provides a testing method, which is applied to the testing apparatus described in the above embodiments. Please refer to... Figure 9 The testing method provided in this application includes: Step S901: In response to a collision occurring in the device where the drive circuit is located, the test device controls the voltage acquisition unit to acquire the voltage at the output terminal of the drive circuit.

[0076] Optionally, the voltage acquisition device includes synchronous sampling acquisition devices, asynchronous sampling acquisition devices, etc., and the device in which the drive circuit is located includes vehicles, automated robots, electric aircraft, stationary energy storage devices, etc.

[0077] Step S902: When the voltage is less than the preset voltage threshold, the test device determines that the control strategy for the drive circuit meets the target control strategy.

[0078] Among them, the target control strategy is the control strategy that the equipment is expected to achieve under collision conditions during the equipment development or design process. For example, in the vehicle development process, it is expected that the vehicle will promptly shut off the main positive relay of the battery pack and the switch in the inverter circuit after a collision. With the main positive relay of the battery pack and the switch in the inverter circuit shut off in a timely manner, the output voltage of the drive circuit should decrease to below a preset voltage threshold within a preset time after the collision.

[0079] Optionally, the preset voltage threshold can be a default value or a manually set value, such as a preset voltage threshold of 30V (rms) AC for alternating current, which needs to meet the requirements specified in the standard.

[0080] In some embodiments, the driving circuit includes multiple output terminals, and multiple voltage acquisition devices acquire the voltage of the multiple output terminals respectively.

[0081] For example, the driving circuit includes a first output terminal, a second output terminal, and a third output terminal. When the voltage between the first output terminal, the second output terminal, the third output terminal, the voltage between the first output terminal and the second output terminal, the voltage between the first output terminal and the third output terminal, and the voltage between the second output terminal and the third output terminal are all less than a preset voltage threshold, it is determined that the control strategy for the driving circuit meets the target control strategy.

[0082] In some embodiments, in response to a collision occurring in the device where the drive circuit is located, the power harvester is controlled to collect the electrical energy flowing through the human body when the human body touches the output terminal of the drive circuit. If the voltage is less than a preset voltage threshold and / or the electrical energy is less than a preset electrical energy threshold, it is determined that the control strategy for the drive circuit meets the target control strategy.

[0083] For example, in response to a collision with a device containing the drive circuit, the power harvester is controlled to collect electrical energy flowing through the human body when the human body simultaneously contacts multiple output terminals of the drive circuit. If the voltage is less than a preset voltage threshold and / or the electrical energy is less than a preset electrical energy threshold, it is determined that the control strategy for the drive circuit meets the target control strategy.

[0084] Optionally, the preset energy threshold can be a default value or a manually set value, such as 0.2 joules.

[0085] For example, such as Figure 10 As shown, another testing method provided in this application embodiment includes: Step S1001: Initialize the test device.

[0086] For example, the power acquisition device and voltage acquisition device are initialized, and the test device can also communicate with the vehicle controller area network (CAN) to collect and identify vehicle status information.

[0087] Step S1002: Set the testing time for the testing device to start testing within 5-60 seconds after the vehicle collision. Step S1003: Voltage acquisition.

[0088] Step S1004: Energy Acquisition.

[0089] Step S1005: Determine whether the voltage is lower than the preset voltage threshold and the electrical energy is lower than the preset electrical energy threshold. If yes, proceed to step S1006; otherwise, proceed to step S1007.

[0090] Optionally, the preset voltage threshold and preset energy threshold are default values ​​or manually set values, which can be set synchronously when setting the start time of the test device.

[0091] Step S1006: Collision test passed.

[0092] Step S1007: The crash test failed.

[0093] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0094] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A testing device, characterized in that, include: One or more voltage acquisition devices, wherein the voltage acquisition devices are used to couple to the output terminal of the drive circuit, and the output terminal of the drive circuit is used to couple to the motor; The voltage acquisition device is configured to acquire the voltage at the output terminal of the drive circuit after a collision occurs in the device containing the drive circuit. The first control circuit is configured to determine that the control strategy for the drive circuit satisfies the target control strategy when the voltage is less than a preset voltage threshold.

2. The testing apparatus according to claim 1, characterized in that, The driving circuit includes a first output terminal and a second output terminal; The voltage acquisition device is specifically configured to: acquire the voltage of the first output terminal and the second output terminal after a collision occurs in the device where the driving circuit is located; The first control circuit is further configured to: calculate the voltage between the first output terminal and the second output terminal based on the voltage of the first output terminal and the voltage of the second output terminal; If the voltage at the first output terminal, the second output terminal, and the voltage between the first output terminal and the second output terminal are less than a preset voltage threshold, it is determined that the control strategy for the drive circuit meets the target control strategy.

3. The testing apparatus according to claim 2, characterized in that, The voltage acquisition device includes: The first phase voltage acquisition device has a first terminal coupled to the first output terminal and a second terminal coupled to the ground terminal, and is used to acquire the voltage of the first output terminal. The second phase voltage acquisition device has a first terminal coupled to the second output terminal and a second terminal coupled to the ground terminal, and is used to acquire the voltage of the second output terminal.

4. The testing apparatus according to claim 3, characterized in that, The voltage acquisition device also includes: A line voltage acquisition device is coupled between the first output terminal and the second output terminal to acquire the voltage between the first output terminal and the second output terminal.

5. The testing apparatus according to claim 1, characterized in that, Also includes: One or more energy harvesters, the energy harvesters being coupled to the output of the drive circuit, the energy harvesters being configured to: after a collision occurs in the device where the drive circuit is located, collect the electrical energy flowing through the human body when the human body comes into contact with the output of the drive circuit; The first control circuit is specifically configured to: determine that the control strategy for the drive circuit satisfies the target control strategy when the voltage is less than a preset voltage threshold and / or the electrical energy is less than a preset electrical energy threshold.

6. The testing apparatus according to claim 5, characterized in that, The energy harvester includes: A human body impedance simulation circuit, wherein the first end of the human body impedance simulation circuit is coupled to the output end of the driving circuit, and the second end of the human body impedance simulation circuit is coupled to the ground end. An analog circuit voltage acquisition unit is coupled to the human body impedance analog circuit and is used to detect the voltage difference across the human body impedance analog circuit. An analog circuit current acquisition device is coupled to the human body impedance analog circuit and is used to detect the current flowing through the human body impedance analog circuit. The second control circuit is configured to: calculate the electrical energy flowing through the human body impedance simulation circuit based on the voltage difference across the two ends of the human body impedance simulation circuit and the current flowing through the human body impedance simulation circuit, and use the electrical energy flowing through the human body impedance simulation circuit as the electrical energy flowing through the human body when the human body contacts the output terminal of the drive circuit.

7. The testing apparatus according to claim 5, characterized in that, The driving circuit includes multiple output terminals; The energy harvester is specifically configured to: after a collision occurs in the device where the drive circuit is located, collect the electrical energy flowing through the human body after the human body simultaneously contacts multiple of the output terminals.

8. The testing apparatus according to claim 5, characterized in that, Also includes: Multiple switches, each corresponding to one of the multiple energy collectors, are coupled between the energy collector and the output terminal of the drive circuit. The first control circuit is further configured to: upon reaching a preset measurement time or determining that the motor has stopped, control one or more of the plurality of switches to close, so that one of the plurality of energy collectors collects the electrical energy flowing through the human body when the human body contacts the output terminal of the drive circuit.

9. A testing method, characterized in that, The method is applied to a testing device, which includes one or more voltage acquisition units. The voltage acquisition units are used to couple to the output terminal of a drive circuit, and the output terminal of the drive circuit is used to couple to a motor. The method includes: In response to determining that a collision has occurred in the device where the drive circuit is located, the voltage acquisition device is controlled to acquire the voltage at the output terminal of the drive circuit; If the voltage is less than a preset voltage threshold, it is determined that the control strategy for the drive circuit meets the target control strategy.

10. The test method according to claim 9, characterized in that, The testing apparatus further includes one or more power collectors, which are used to couple to the output of the drive circuit. The method further includes: In response to a collision with the device where the drive circuit is located, the power harvester is controlled to collect the electrical energy flowing through the human body when the human body touches the output terminal of the drive circuit; The step of determining that the control strategy for the drive circuit satisfies the target control strategy when the voltage is less than a preset voltage threshold includes: If the voltage is less than a preset voltage threshold and / or the electrical energy is less than a preset electrical energy threshold, it is determined that the control strategy for the drive circuit meets the target control strategy.

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