Test circuit and test device
By designing processing and simulation circuits, the connection state between the charging gun and the power supply of an electric vehicle power supply is simulated, solving the problem that existing testing devices cannot simulate actual working conditions and achieving higher precision testing of electric vehicle power supplies.
Patent Information
- Application Number
- CN202422833374.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-19
AI Technical Summary
Existing electric vehicle power supply test devices cannot effectively simulate the actual operating conditions of electric vehicle power supplies, resulting in low test accuracy.
A test circuit was designed, including a processing circuit and multiple simulation circuits. By controlling the switching circuit and the resistance circuit, the connection confirmation signal and charging power signal between the charging gun and the electric vehicle power supply were simulated. The three connection states between the charging gun and the electric vehicle power supply were simulated, including the initial insertion, half connection and full connection states.
This improves the testing accuracy of electric vehicle power supply testing, making the testing process more consistent with actual working conditions and enhancing the accuracy of the tests.
Smart Images
Figure CN223486145U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electric vehicle power supply testing technology, and in particular to a test circuit and test device. Background Technology
[0002] Testing electric vehicle power supplies (CDUs, Conversion & Distribution Units) involves testing the on-board power supply of electric vehicles. This includes functional, performance, and fault simulation testing of conductive on-board chargers and DC-DC (Direct Current to DC) converters. Testing electric vehicle CDUs is also a crucial way to verify whether they meet national standards and regulations. According to requirements, all specified test items must be completed. Each test corresponds to different timing logic and functional manifestations. When testing on a test bench, it is necessary to simulate the CAN communication control signals of the electric vehicle, combined with some hard-wired control signals (including cable connection confirmation signal CC, charging power confirmation signal CP, and level signals), to test the corresponding operating state transitions of the CDU and the corresponding input / output changes of the ports to determine if they meet design requirements. Existing test devices, circuits, or systems used for testing electric vehicle CDUs cannot adequately simulate the actual operating conditions of electric vehicle power supplies, resulting in low test accuracy. Utility Model Content
[0003] This application provides a test circuit for testing electric vehicle power supplies. The test circuit includes a processing circuit and a first analog circuit. The first analog circuit is connected to the processing circuit and is used to simulate a connection confirmation signal between the charging gun and the electric vehicle power supply based on the control of the processing circuit. The connection confirmation signal includes a first connection confirmation signal when the electric vehicle power supply and the charging gun are in a half-connection state and a second connection confirmation signal when the electric vehicle power supply and the charging gun are in a fully connected state.
[0004] In some embodiments, the first analog circuit includes: a first resistance circuit, a first signal terminal of which is connected to a connection confirmation interface; a second resistance circuit, the first signal terminal of which is connected to a second signal terminal of which; a first switch circuit, the first signal terminal of which is connected to the first signal terminal of which is connected to the second resistance circuit, and the second signal terminal of which is connected to the second resistance circuit in parallel; a control terminal of which is connected to a processing circuit; and a second switch circuit, the first signal terminal of which is connected to the second resistance circuit, and the control terminal of which is connected to the processing circuit; the second signal terminal of which is grounded; wherein the processing circuit controls the second switch circuit to be turned on and controls the first switch circuit to be turned off, so that the first analog circuit simulates a first connection confirmation signal; and the processing circuit controls the second switch circuit to be turned on and controls the first switch circuit to be turned on, so that the first analog circuit simulates a second connection confirmation signal.
[0005] In some embodiments, the test circuit includes a plurality of first analog circuits, each connected to the processing circuit. The plurality of first analog circuits are used to simulate connection confirmation signals of different charging capacities, and the processing circuit is used to selectively control the corresponding first analog circuit to simulate the connection confirmation signal of the corresponding charging capacity.
[0006] In some embodiments, the test circuit further includes a second analog circuit connected to the processing circuit. The second analog circuit is used to connect to the charging power confirmation interface of the electric vehicle power supply and to simulate and output a charging power signal based on the control of the processing circuit.
[0007] In some embodiments, the second analog circuit includes: a third resistance circuit, the first signal terminal of which is used to connect to the operating voltage; a power transistor, the first signal terminal of which is connected to the second signal terminal of the third resistance circuit, the second signal terminal of which is connected to the processing circuit, the third signal terminal of which is used to connect to the charging power confirmation interface, and the processing circuit is used to selectively control the conduction or disconnection of the first signal terminal and the third signal terminal of the power transistor so that the power transistor simulates and outputs a charging power signal.
[0008] In some embodiments, the test circuit further includes a working voltage bus, and the second analog circuit further includes: a third switching circuit, the first signal terminal of which is connected to the working voltage bus for receiving the working voltage, the control terminal of the third switching circuit being connected to the processing circuit, the second signal terminal of the third switching circuit being connected to the first signal terminal of the third resistance circuit, and the third switching circuit being used to turn on or off based on the control of the processing circuit to receive the working voltage into the third resistance circuit.
[0009] This application also proposes a testing device, which includes: a touch display and a testing circuit described in any of the above embodiments. The touch display is connected to a processing circuit and is used to generate a corresponding control signal based on touch operation. The processing circuit is used to control the operation of the testing circuit based on the control signal.
[0010] In some embodiments, the testing apparatus further includes an oscilloscope, and the testing circuit further includes: a second analog circuit connected to the processing circuit and the oscilloscope, the second analog circuit being used to connect to the charging power confirmation interface of the electric vehicle power supply, and to simulate and output a charging power signal based on the control of the processing circuit; the oscilloscope being used to display the waveform of the charging power signal.
[0011] In some embodiments, the testing apparatus further includes: a housing, a touch display and an oscilloscope disposed in the housing; a connector disposed in the housing, wherein the output ports of the first analog circuit and the second analog circuit are integrated in the connector.
[0012] In some embodiments, the testing apparatus further includes an integrated board disposed within the housing, wherein the testing circuitry is integrated on the integrated board.
[0013] The beneficial effects of this application embodiment are as follows: This application provides a test circuit for testing electric vehicle power supplies. The test circuit includes a processing circuit and a first simulation circuit. The first simulation circuit is connected to the processing circuit and is used to simulate a connection confirmation signal between the charging gun and the electric vehicle power supply based on the control of the processing circuit. The connection confirmation signal includes a first connection confirmation signal when the electric vehicle power supply and the charging gun are in a half-connection state and a second connection confirmation signal when the electric vehicle power supply and the charging gun are in a fully connected state. The test circuit is configured with a processing circuit and a first simulation circuit. The first simulation circuit is configured to simulate the first connection confirmation signal in the half-connection state and the second connection confirmation signal in the fully connected state under the control of the processing circuit. Based on this, the test circuit can fully simulate the three sequentially changing connection states of the charging gun and the electric vehicle power supply (i.e., the initial insertion, the half-connection state, and the fully connected state). This makes the connection confirmation signal simulated by the test circuit more consistent with the actual connection situation of the charging gun and the electric vehicle power supply, thereby making the test process of the electric vehicle power supply test more consistent with the actual working conditions and effectively improving the test accuracy of the electric vehicle power supply test. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the circuit structure of one embodiment of the test circuit of this application;
[0015] Figure 2 This is a schematic diagram of the forward structure of an embodiment of the testing device of this application;
[0016] Figure 3 yes Figure 2 A schematic diagram of the test device along the X1 direction is shown.
[0017] Figure 4 yes Figure 2 A schematic diagram of the test device along the X2 direction. Detailed Implementation
[0018] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0019] The terms "first" and "second" in this application 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. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise expressly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.
[0020] like Figure 1 As shown, this application proposes a test circuit (not shown in the figure) for testing electric vehicle power supplies (CDU, Conversion & Distribution Unit), i.e., electric vehicle power supply testing. Electric vehicle power supply testing is an important way to verify whether CDU products meet the design requirements of national standards and regulations. According to the requirements, all the specified test items need to be completed, and each test corresponds to different timing logic and functional manifestation.
[0021] like Figure 1 As shown, the test circuit includes a processing circuit M1 and a first analog circuit A0. The first analog circuit A0 is connected to the processing circuit M1 and is used to simulate the connection confirmation signal (also known as the cable connection confirmation signal CC) between the charging gun and the electric vehicle power supply based on the control of the processing circuit M1. The connection confirmation signal includes a first connection confirmation signal when the electric vehicle power supply and the charging gun are in a half-connection state and a second connection confirmation signal when the electric vehicle power supply and the charging gun are in a fully connected state.
[0022] During the charging process at a charging station, an electric vehicle needs to connect to the EV's power source via a charging gun on the charging station. In actual charging, as the charging gun is inserted and connected to the EV's power source, the connection states sequentially include: initial insertion (i.e., unconnected state, which does not need to be simulated), partial connection, and full connection. The test circuit is configured with a processing circuit M1 and a first simulation circuit A0. The first simulation circuit A0, under the control of the processing circuit M1, simulates a first connection confirmation signal for the partial connection state and a second connection confirmation signal for the full connection state. This allows the test circuit to fully simulate the three sequentially changing connection states of the charging gun and the EV's power source (initial insertion, partial connection, and full connection), making the simulated connection confirmation signals more consistent with the actual connection situation. This, in turn, makes the EV power source testing process more realistic and improves the testing accuracy.
[0023] Optionally, such as Figure 1 As shown, the first analog circuit A0 includes: a first resistance circuit R0, a second resistance circuit R1, a first switching circuit K0, and a second switching circuit K1.
[0024] In this circuit, the first signal terminal of the first resistance circuit R0 is connected to the connection confirmation interface. The first signal terminal of the second resistance circuit R1 is connected to the second signal terminal of the first resistance circuit R0. The first signal terminal of the first switch circuit K0 is connected to the first signal terminal of the second resistance circuit R1, and the second signal terminal of the first switch circuit K0 is connected to the second signal terminal of the second resistance circuit R1, so as to be connected in parallel with the second resistance circuit R1. The control terminal of the first switch circuit K0 is connected to the processing circuit M1. The first signal terminal of the second switch circuit K1 is connected to the second signal terminal of the second resistance circuit R1, and the control terminal of the second switch circuit K1 is connected to the processing circuit M1. The second signal terminal of the second switch circuit K1 is grounded. The processing circuit M1 is used to control the second switch circuit K1 to be turned on and to control the first switch circuit K0 to be turned off, so that the first analog circuit A0 simulates the first connection confirmation signal. The processing circuit M1 is also used to control the second switch circuit K1 to be turned on and to control the first switch circuit K0 to be turned on, so that the first analog circuit A0 simulates the second connection confirmation signal.
[0025] The first resistance circuit R0 and the second resistance circuit R1 can be resistance circuits composed of one or more resistors. The resistance values of the first resistance circuit R0 and the second resistance circuit R1 can be determined according to actual requirements. For example, in some embodiments, the resistance value of the first resistance circuit R0 can be 1.5kΩ, 680Ω, or 220Ω, and the corresponding resistance value of the second resistance circuit R1 can be 1.8kΩ, 2.7kΩ, or 3.3kΩ. The first switch circuit K0 and the second switch circuit K1 can be controllable switching elements such as relays or switching transistors. The first resistance circuit R0, the second resistance circuit R1, the first switch circuit K0, and the second switch circuit K1, connected in the above manner, constitute the first analog circuit A0. The processing circuit M1 can selectively control the first switching circuit K0 and the second switching circuit K1 to be turned on or off. Turning on the first switching circuit K0 means that its first signal terminal is connected to its second signal terminal, thus short-circuiting the second resistance circuit R1. Conversely, turning off the first switching circuit K0 means that its first and second signal terminals are disconnected, thus connecting the second resistance circuit R1 in series with the first resistance circuit R0. Turning on the second switching circuit K1 means that its first and second signal terminals are connected; turning off the second switching circuit K1 means that its first and second signal terminals are disconnected.
[0026] The processing circuit M1 can control the first analog circuit A0 to simulate the first connection confirmation signal and the second connection confirmation signal by controlling the on and off relationships of the first switch circuit K0 and the second switch circuit K1. For example, the processing circuit M1 first controls the first switch circuit K0 to be off and controls the second switch circuit K1 to be on, so that the first analog circuit A0 can simulate the first connection confirmation signal. After 2 seconds, the processing circuit M1 controls the first switch circuit K0 to be on and controls the second switch circuit K1 to be on, so that the first analog circuit A0 can simulate the second connection confirmation signal. Based on this, the first analog circuit A0 can simulate the half-connection state and the full-connection state of the charging gun and the electric vehicle power supply, so that the test process is more in line with the actual working conditions, thereby effectively improving the test accuracy of the electric vehicle power supply test.
[0027] Optionally, the processing circuit M1 can be a microprocessor or processing chip with computing functions.
[0028] Optionally, such as Figure 1As shown, the test circuit includes multiple first analog circuits A0, each connected to a processing circuit M1. The multiple first analog circuits A0 are used to simulate connection confirmation signals with different charging capacities. The processing circuit M1 selectively controls the corresponding first analog circuit A0 to simulate connection confirmation signals with the corresponding charging capacity. This allows the test circuit to simulate connection confirmation signals with various charging capacities, effectively improving its applicability.
[0029] Specifically, the plurality of first analog circuits A0 include first analog circuit A1, first analog circuit A2, and first analog circuit A3. First analog circuits A1, A2, and A3 have the same circuit structure. First analog circuit A1 includes a first resistance circuit R2, a second resistance circuit R3, a first switch circuit K2, and a second switch circuit K3. The specific connection methods of the first resistance circuit R2, R3, K2, and K3 can be found in [reference needed]. Figure 1 As shown in the diagram, and referring to the detailed description of the circuit connection structure of the first analog circuit A0 above, this article will not repeat the details here. The first analog circuit A2 includes a first resistance circuit R4, a second resistance circuit R5, a first switch circuit K4, and a second switch circuit K5. The specific connection methods of the first resistance circuit R4, the second resistance circuit R5, the first switch circuit K4, and the second switch circuit K5 can be found in [reference needed]. Figure 1 As shown in the diagram, and referring to the detailed description of the circuit connection structure of the first analog circuit A0 above, this article will not repeat the details here. The first analog circuit A3 includes a first resistance circuit R6, a second resistance circuit R7, a first switch circuit K6, and a second switch circuit K7. The specific connection methods of the first resistance circuit R6, the second resistance circuit R7, the first switch circuit K6, and the second switch circuit K7 can be found in [reference needed]. Figure 1 As shown in the diagram, and referring to the detailed description of the circuit connection structure of the first analog circuit A0 above, it will not be repeated in detail here. The method by which the first analog circuits A1, A2, and A3 simulate the connection confirmation signal can be found in the description of the first analog circuit A0 above, and will not be repeated in detail here.
[0030] Specifically, by configuring first resistance circuits R0 and R1 with different resistance values for the first analog circuits A1, A2, and A3, each of these circuits can simulate connection confirmation signals (including a first connection confirmation signal and a second connection confirmation signal) with different charging capacities. Specifically, the resistance of the first resistance circuit R2 can be set to 1.5kΩ, and the resistance of the second resistance circuit R3 can be set to 1.8kΩ, allowing the first analog circuit A1 to simulate a connection confirmation signal for a charging gun with a charging capacity of 10A. The resistance of the first resistance circuit R4 can be set to 680Ω, and the resistance of the second resistance circuit R5 can be set to 2.7kΩ, allowing the first analog circuit A2 to simulate a connection confirmation signal for a charging gun with a charging capacity of 16A. The resistance of the first resistance circuit R6 can be set to 220Ω, and the resistance of the second resistance circuit R7 can be set to 3.3kΩ, allowing the first analog circuit A3 to simulate a connection confirmation signal for a charging gun with a charging capacity of 32A. The processing circuit M1 can select one of the first analog circuits A1, A2, and A3 to connect to the electric vehicle power supply according to actual needs. For example, the processing circuit M1 can control the second switching circuit K3 to be turned on and the second switching circuit K5 and K4 to be turned off, so that the test circuit can be connected to the electric vehicle power supply using the first analog circuit A1. Alternatively, the processing circuit M1 can control the second switching circuit K3 to be turned off and the second switching circuit K5 to be turned on, so that the test circuit can be connected to the electric vehicle power supply using the first analog circuit A2. Or, the processing circuit M1 can control the second switching circuit K3 to be turned off and the second switching circuit K5 to be turned on, so that the test circuit can be connected to the electric vehicle power supply using the first analog circuit A2.
[0031] Optionally, such as Figure 1 As shown, the test circuit also includes: a second analog circuit A4, which is connected to the processing circuit M1. The second analog circuit A4 is used to connect to the charging power confirmation interface of the electric vehicle power supply and simulate and output the charging power signal (also known as the charging power confirmation signal CP) based on the control of the processing circuit M1.
[0032] Specifically, the second analog circuit A4 includes a third resistor circuit R8 and a power transistor G1. The first signal terminal of the third resistor circuit R8 is used to connect the operating voltage. The first signal terminal of the power transistor G1 is connected to the second signal terminal of the third resistor circuit R8, the second signal terminal of the power transistor G1 is connected to the processing circuit M1, and the third signal terminal of the power transistor G1 is used to connect to the charging power confirmation interface. The processing circuit M1 is used to selectively control the conduction or disconnection of the first and third signal terminals of the power transistor G1 to enable the power transistor G1 to simulate and output a charging power signal. The power transistor G1 can be an IGBT (Insulated Gate Bipolar Transistor). The processing circuit M1 adjusts the duty cycle of the charging power signal output by the power transistor G1 by controlling the conduction or disconnection of the first and third signal terminals of the power transistor G1, thereby enabling the second analog circuit A4 to output charging power signals with different duty cycles. The charging power signal is a pulse width modulation (PWM) signal. The third resistance circuit R8 can be a resistance circuit composed of one or more resistors. The resistance of the third resistance circuit R8 can be selected according to the actual situation. For example, in some embodiments, the resistance of the third resistance circuit R8 can be 1kΩ and the input voltage is 12V. When the test circuit is connected to the electric vehicle power supply, the processing circuit M1 can control the power transistor G1 to turn on or off so that the power transistor G1 can simulate a 6V PWM signal.
[0033] Optionally, such as Figure 1 As shown, the second analog circuit A4 also includes a third switching circuit K8, which can be a controllable switch such as a relay. The first signal terminal of the third switching circuit K8 is connected to the first signal terminal of the third resistance circuit R8, and the second signal terminal of the third switching circuit K8 is connected to the working voltage bus 30 for receiving the working voltage. The control terminal of the third switching circuit K8 is connected to the processing circuit M1. The third switching circuit K8 is turned on or off based on the control of the processing circuit M1 to allow the working voltage to be received at the first signal terminal of the third resistance circuit R8.
[0034] In actual charging conditions for electric vehicles, charging stations come in two types: card-swipe stations and non-card-swipe stations. For card-swipe stations, after the user connects the charging gun to the electric vehicle's charging port (i.e., connects the charging gun to the electric vehicle's power source) and clicks the card-swipe button, the charging gun needs to wait for a period of time (e.g., two minutes) before sending a charging power signal to the electric vehicle's power source. For non-card-swipe stations, after the user connects the charging gun to the electric vehicle's charging port (i.e., connects the charging gun to the electric vehicle's power source) and clicks the card-swipe button, the charging gun will immediately send a charging power signal. The second analog circuit A4 is connected to the working voltage bus 30 through the third switching circuit K8. The third switching circuit K8 is turned on or off based on the control of the processing circuit M1, so that the working voltage is connected to the second analog circuit A4. Based on this, the processing circuit M1 can control the charging power signal generation time of the second analog circuit A4 by controlling the third switching circuit K8. This makes the charging power signal simulated by the second analog circuit A4 under the control of the processing circuit M1 more consistent with the actual working conditions of the charging pile, thereby making the test process of electric vehicle power supply test more consistent with the actual working conditions and effectively improving the test accuracy of electric vehicle power supply test.
[0035] Optionally, such as Figure 1 As shown, the test circuit also includes an oscilloscope M3, which is connected to the third signal terminal of the power transistor G1. The oscilloscope M3 is used to display the waveform of the charging power signal in real time.
[0036] Optionally, such as Figure 1 As shown, the test circuit includes a working voltage bus 30, a fourth resistance circuit R9, and a fourth switch circuit K9. The processing circuit M1 is connected to the working voltage bus 30 via the fourth resistance circuit R9 to receive the working voltage. The fourth resistance circuit R9 also protects the processing circuit M1. The fourth resistance circuit R9 can be a resistance circuit composed of one or more resistors. The first signal terminal of the fourth switch circuit K9 is connected to the working voltage bus 30, the second signal terminal is connected to the processing circuit M1, and the third signal terminal is used to connect to the electric vehicle power supply. Based on this, the processing circuit M1 and the fourth switch circuit K9 form a DC-DC power supply wake-up circuit. The processing circuit M1 controls the fourth switch circuit K9 to conduct, causing the first and third signal terminals of the fourth switch circuit K9 to conduct, thereby outputting a wake-up signal (also known as a DC-DC enable signal) to the electric vehicle power supply.
[0037] Optionally, such as Figure 1As shown, the test circuit also includes a master switch S1, located on the working voltage bus 30. The master switch S1 can be a physical switch used to control the power-on and power-off of the working voltage bus 30. For example, when the master switch S1 is closed, the working voltage bus 30 is powered on, providing working voltage for the processing circuit M1, the second analog circuit A4, and other working circuits. When the master switch S1 is open, the working voltage bus 30 is powered off. The working voltage bus 30 is also used to connect to the electric vehicle power supply to provide test voltage to the electric vehicle power supply.
[0038] Optionally, such as Figure 1 As shown, the test circuit also includes a fifth resistance circuit R10 and an indicator light L1. The fifth resistance circuit R10 can be a resistance circuit composed of one or more resistors. The first signal terminal of the fifth resistance circuit R10 is connected to the first signal terminal of the indicator light L1, and the second signal terminal of the indicator light L1 is grounded. The second signal terminal of the fifth resistance circuit R10 serves as a signal input port for connection to the electric vehicle power supply to receive a wake-up feedback signal. For example, when the electric vehicle power supply is woken up based on a connection confirmation signal and a charging power signal, the electric vehicle power supply outputs a wake-up feedback signal to illuminate the indicator light L1, indicating that the electric vehicle power supply test was successful.
[0039] Optionally, such as Figure 1 and Figure 2 As shown, the test circuit also includes a touch display M2, which is connected to the processing circuit M1 via a data signal line. Various virtual switches are set on the touch display panel of the touch display M2. The touch display M2 generates corresponding control signals based on the virtual switches triggered by the user, and transmits these signals through I... 2 The control signals are transmitted to the processing circuit M1 via C communication. The processing circuit M1 then performs the corresponding operations based on the control signals transmitted by the touch display M2.
[0040] For example, the touch display panel of the touch display M2 is equipped with virtual switches such as a 10A connection confirmation signal switch, a 16A connection confirmation signal switch, a 32A connection confirmation signal switch, a charging power signal output switch, a duty cycle adjustment switch, a wake-up signal switch, and a CAN bus connection switch. The touch display M2 can generate a corresponding control signal based on any of the above virtual switches triggered by the user and pass it to the processing circuit M1, so that the processing circuit M1 controls the first analog circuit A0 and / or the second analog circuit A4 and / or the wake-up circuit and other functional circuits to work based on the control signal.
[0041] like Figure 1 and Figure 2As shown, this application also provides a testing device 1, which includes a touch display M2 and the testing circuit described in any of the above embodiments. The touch display M2 can also be considered part of the testing circuit, as detailed above; further details are omitted here. The touch display M2 is connected to a processing circuit M1 and is used to generate corresponding control signals based on touch operations. The processing circuit M1 controls the operation of the testing circuit based on the control signals.
[0042] Specifically, the touch display panel of the touch display M2 is equipped with various virtual switches. The touch display M2 generates corresponding control signals based on the virtual switches triggered by the user, and transmits them through I... 2 The control signals are transmitted via C-communication to the processing circuit M1, which then executes corresponding operations based on the control signals transmitted by the touch display M2. The test circuit receives instructions from the virtual switch on the touch display M2 and controls the switching circuit within the test circuit to achieve the testing function, thus effectively improving the ease of operation of the test device 1.
[0043] Optionally, such as Figure 1 and Figure 2 As shown, the test device 1 also includes an oscilloscope M3, and the test circuit further includes a second analog circuit A4, which is connected to the processing circuit M1 and the oscilloscope M3. The second analog circuit A4 is used to connect to the charging power confirmation interface of the electric vehicle power supply, and simulates and outputs the charging power signal based on the control of the processing circuit M1; the oscilloscope M3 is used to display the waveform of the charging power signal. Of course, in some embodiments, the oscilloscope M3 may also be referred to as part of the test circuit.
[0044] Optionally, such as Figure 3 As shown, the test device 1 includes: a housing 10 and a connector C1. A display and an oscilloscope M3 are disposed in the housing 10. The connector C1 is disposed in the housing 10. The output port of the first analog circuit A0 (that is, the first signal terminal of the first resistance circuit) and the output port of the second analog circuit A4 (that is, the third signal terminal of the power transistor G1) are integrated in the connector C1. Based on this, when conducting tests, the test device 1 can be connected to the electric vehicle power supply through the connector C1 to improve the connection convenience of the test device 1.
[0045] Optionally, connector C1 also integrates a plug-in port connected to the third signal terminal of the fourth switch circuit K9, a plug-in port connected to the second signal terminal of the fifth resistance circuit R10, a first plug-in port connected to the CAN communication bus, and a plug-in port connected to the working voltage bus 30.
[0046] Optionally, such as Figure 2 and Figure 4As shown, the test device 1 also includes a second connector C2 and a third connector C3. The first connector C2 is connected to the second connector C2. The test device 1 is connected to the CAN communication bus through the second connector C2 and to the communication port of the electric vehicle power supply through the first connector C3. The third connector C3 is used to connect to the power supply voltage bus. The test device 1 is connected to the power supply voltage through the third connector C3.
[0047] Optionally, the test device 1 also includes an integrated board (not shown), such as a circuit board, which is disposed inside the housing 10. The test circuit is integrated on the integrated board, which can effectively improve the integration of the integrated circuit.
[0048] For example, when testing the efficiency of a DC-DC converter in an electric vehicle, first connect a 12V power supply to the working voltage bus 30, turn on the main switch S1, click the wake-up signal switch on the touch display M2, and after the processing circuit M1 receives the signal, it turns on the fourth switch circuit K9. At this time, the low-voltage communication signal loop is completed.
[0049] For example, when conducting efficiency tests on conductive on-board chargers for electric vehicles, first connect a 12V power supply to the working voltage bus 30, turn on the main switch S1, select the connection confirmation signal for the corresponding charging capacity (e.g., a 10A connection confirmation signal) and the connection mode for the corresponding type of charging pile on the touch display M2, adjust the corresponding duty cycle (e.g., the duty cycle can be adjusted to 53%), then connect the test device 1 to the CAN communication bus, and connect the input / output bench wiring harness. If the circuit is normal, the indicator light L1 will light up.
[0050] It is worth noting that the accompanying drawings are only for illustrating the structural and connection relationships of the product of this utility model, and do not limit the specific structural dimensions of the product of this utility model.
[0051] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A test circuit, characterized in that, The test circuit, used for testing the power supply of electric vehicles, includes: Processing circuitry; A first analog circuit, connected to the processing circuit, is used to simulate a connection confirmation signal between the charging gun and the electric vehicle power supply based on the control of the processing circuit. The connection confirmation signal includes a first connection confirmation signal when the electric vehicle power supply and the charging gun are in a half-connection state and a second connection confirmation signal when the electric vehicle power supply and the charging gun are in a fully connected state.
2. The test circuit according to claim 1, characterized in that, The first analog circuit includes: A first resistance circuit, wherein the first signal terminal of the first resistance circuit is used to connect to the connection confirmation interface; The second resistance circuit has its first signal terminal connected to the second signal terminal of the first resistance circuit. A first switching circuit, wherein the first signal terminal of the first switching circuit is connected to the first signal terminal of the second resistance circuit, the second signal terminal of the first switching circuit is connected to the second signal terminal of the second resistance circuit so as to be connected in parallel with the second resistance circuit, and the control terminal of the first switching circuit is connected to the processing circuit. The second switching circuit has a first signal terminal connected to the second signal terminal of the second resistance circuit, a control terminal connected to the processing circuit, and a second signal terminal grounded. The processing circuit is configured to control the second switching circuit to be turned on and control the first switching circuit to be turned off, so that the first analog circuit can simulate a first connection confirmation signal; and the processing circuit is configured to control the second switching circuit to be turned on and control the first switching circuit to be turned on, so that the first analog circuit can simulate a second connection confirmation signal.
3. The test circuit according to any one of claims 1-2, characterized in that, The test circuit includes multiple first analog circuits, each connected to the processing circuit. The multiple first analog circuits are used to simulate connection confirmation signals of different charging capacities. The processing circuit is used to selectively control the corresponding first analog circuit to simulate the connection confirmation signal of the corresponding charging capacity.
4. The test circuit according to claim 1, characterized in that, Also includes: A second analog circuit is connected to the processing circuit. The second analog circuit is used to connect to the charging power confirmation interface of the electric vehicle power supply, and simulates and outputs a charging power signal based on the control of the processing circuit.
5. The test circuit according to claim 4, characterized in that, The second analog circuit includes: The third resistance circuit has its first signal terminal used to connect to the working voltage; A power transistor has its first signal terminal connected to the second signal terminal of the third resistance circuit. The second signal terminal of the power transistor is connected to the processing circuit. The third signal terminal of the power transistor is used to connect to the charging power confirmation interface. The processing circuit is used to selectively control the conduction or disconnection of the first signal terminal and the third signal terminal of the power transistor so that the power transistor simulates and outputs the charging power signal.
6. The test circuit according to claim 5, characterized in that, The test circuit further includes a working voltage bus, and the second analog circuit further includes a third switching circuit, the first signal terminal of which is connected to the working voltage bus for receiving the working voltage. The control terminal of the third switching circuit is connected to the processing circuit, and the second signal terminal of the third switching circuit is connected to the first signal terminal of the third resistance circuit. The third switching circuit is used to connect the working voltage to the third resistance circuit based on the control of the processing circuit to turn on or off.
7. A testing apparatus, characterized in that, include: The touch display and the test circuit according to any one of claims 1-6, wherein the touch display is connected to the processing circuit for generating a corresponding control signal based on a touch operation, and the processing circuit is used to control the operation of the test circuit based on the control signal.
8. The testing apparatus according to claim 7, characterized in that, The testing device also includes an oscilloscope, and the testing circuit further includes: A second analog circuit is connected to the processing circuit and the oscilloscope. The second analog circuit is used to connect to the charging power confirmation interface of the electric vehicle power supply, and simulates and outputs a charging power signal based on the control of the processing circuit. The oscilloscope is used to display the waveform of the charging power signal.
9. The testing apparatus according to claim 8, characterized in that, include: The housing, the touch display and the oscilloscope are disposed in the housing; A connector is disposed on the housing, and the output ports of the first analog circuit and the second analog circuit are integrated into the connector.
10. The testing apparatus according to claim 9, characterized in that, Also includes: An integrated board is disposed within the housing, and the test circuit is integrated onto the integrated board.