A Y-capacitor simulator

Abstract

The utility model discloses a kind of Y capacitor simulators, Y capacitor characteristics can be dynamically simulated, to improve insulation resistance measurement accuracy and optimize test efficiency.The simulator is composed of relay module, power supply module, control module, CAN communication module and OLED display module, with capacitance adjustment, remote control, real-time data feedback function.Capacitance switching is realized by relay module, power supply module uses MP1584EN chip to provide stable power supply.Control module communicates with external equipment through CAN communication module, can receive instruction and dynamically adjust Y capacitor characteristics.OLED display module real-time display capacitance output, facilitate user monitoring test process.The equipment is also configured filter capacitor component to suppress electromagnetic interference (EMC), enhance signal stability and electrical safety.Through the accurate adjustment of simulator, the influence of Y capacitor on insulation resistance measurement can be effectively reduced, adapt to complex working conditions, meet new energy vehicle test requirements.

Description

Technical Field

[0001] This utility model relates to the field of battery control and simulation, specifically to a Y capacitor simulator. Background Technology

[0002] With the rapid development of new energy vehicles and electrification technologies, the complexity and safety requirements of vehicle electrical systems have significantly increased. In high-voltage system testing, insulation performance testing is crucial, with insulation resistance being a key indicator directly reflecting the system's isolation safety. However, the presence of Y capacitors affects the accuracy of insulation resistance measurements. Y capacitors are divided into actively designed safety capacitors and structurally formed parasitic capacitors, primarily used to suppress electromagnetic interference (EMC). However, their charging and discharging processes can cause a decrease in measured values, and impedance mismatch may interfere with signal integrity, reduce test accuracy, and even pose electrical safety risks. Traditional testing methods lack dynamic adjustment and remote control capabilities, making them difficult to adapt to complex operating conditions.

[0003] Furthermore, resonant circuits are widely used in filtering and frequency selection. By connecting inductors and capacitors in series or parallel, specific frequency selection can be achieved, thus optimizing signal quality. Combining resonant circuits with Y-capacitor dynamic simulation technology can further improve test stability and accuracy.

[0004] Therefore, an innovative technical solution is urgently needed to support dynamic simulation of Y capacitor characteristics, adjustment of resonant circuit impedance and frequency, and to achieve remote control and real-time data feedback. This invention aims to reduce the impact of Y capacitors on insulation resistance measurement, improve testing efficiency and accuracy, ensure electromagnetic interference suppression, and guarantee electrical safety, meeting the stringent requirements of high-voltage system testing for new energy vehicles. Utility Model Content

[0005] Based on the above analysis, the present invention provides the following specific implementation scheme:

[0006] A Y-capacitor simulator, characterized in that it includes a relay module: the relay module includes a chip, multiple access groups and an output terminal, one access group includes a relay and a parallel capacitor group, the relay is connected in series with the parallel capacitor group, one pin of the chip is connected to one end of one access group, and the other end of one access group is connected to the output terminal;

[0007] The chip controls the capacitor output of the access group by changing the output level. When the pin connected to the access group outputs a high level, the relay in the access group is turned off, and the parallel capacitor group in the access group does not output capacitor. When the pin connected to the access group outputs a low level, the relay in the access group is turned on, and the parallel capacitor group in the access group outputs capacitor.

[0008] The relay module manages the capacitor output by controlling the output level through a chip. When the chip's pin outputs a high level, the relay is off, and the capacitor bank does not output capacitance. When the pin outputs a low level, the relay is on, causing the capacitor bank to output capacitance. This establishes the basic working principle of the Y capacitor simulator, which uses digital control to achieve adjustable capacitor output to simulate the function of a Y capacitor.

[0009] Preferably, the output capacitance of the nth capacitor bank in the plurality of capacitor banks is C = 2. n-1 *0.1uF.

[0010] This specification stipulates that the output capacitance of the nth parallel capacitor bank must be a multiple of 0.1uF. This requirement clarifies the output capacitance design of the capacitor bank, ensuring that the simulator can adjust the capacitor output in 0.1uF increments, facilitating accurate simulation of Y capacitors of different specifications.

[0011] Preferably, the relay uses an MC1413 chip. Alternatively, the relay may be an HF46F / 12-HS1 relay.

[0012] The chip used is MC1413, and the relay is HF46F / 12-HS1. This clear hardware selection ensures the reliability and compatibility of the control and relay switching functions.

[0013] Preferably, the Y-capacitor simulator further includes a power supply module, which uses an MP1584EN chip. The MP1584EN chip includes a VIN pin and an SW pin. The VIN pin is connected to a 12V DC voltage and is connected to one end of capacitor C12 and one end of capacitor C13. The other ends of capacitor C12 and capacitor C13 are grounded. The SW pin is connected to capacitors C14, C15, C16, and C17. Capacitors C14, C15, C16, and C17 are connected in parallel and then grounded.

[0014] A power supply module using the MP1584EN chip provides a stable power supply, ensuring the normal operation of the circuit. The input DC voltage is filtered using capacitors to improve power quality.

[0015] Preferably, a resistor R13 is connected in series with the SW pin, and an LED D1 is connected in series with the resistor R13. The LED D1 is grounded.

[0016] LEDs are used to indicate the operating status of the power supply module. This adds a visual feedback function to the system, allowing users or maintenance personnel to intuitively understand whether the power supply module is working properly.

[0017] Preferably, the Y capacitor simulator further includes a control module, which uses an STM32F103C8T6 chip.

[0018] The STM32F103C8T6 chip is used to process input commands, control the switching state of relay modules, and coordinate communication with other modules, thereby improving the intelligence and programmability of the system.

[0019] Preferably, the Y capacitor simulator further includes a CAN communication module, which uses an SN65HVD230D CAN transceiver. The SN65HVD230D CAN transceiver includes an S pin, which is grounded.

[0020] Grounding the S pin enables the SN65HVD230D to operate in high-speed mode, ensuring that the CAN transceiver performs data communication with optimal performance.

[0021] Preferably, the CAN communication module is connected to a CAN signal receiving terminal, which is a KF301-2P terminal block. The KF301-2P terminal block is connected to an external CAN device, which refers to a device that sends control commands.

[0022] The KF301-2P terminal block specification defines the hardware implementation of the communication interface, ensuring the reliability and compatibility of signal transmission.

[0023] Preferably, the Y-capacitor simulator further includes an OLED display module, which displays the capacitance output by the relay module.

[0024] The OLED display module enhances the user experience of the system, allowing users to view the current simulated capacitance value in real time, which facilitates debugging and operation.

[0025] Preferably, the Y capacitor simulator further includes a 3.3V filter capacitor and a 12V filter capacitor. The 3.3V filter capacitor is connected in series with the 3.3V DC power supply and grounded; the 12V filter capacitor is connected in parallel with the 12V DC power supply and grounded.

[0026] Filter capacitors ensure the stability of the power supply voltage, reduce noise interference, and improve the overall electrical performance and reliability of the system.

[0027] The beneficial effects of this utility model are as follows:

[0028] (1) This utility model achieves dynamic simulation of the characteristics of Y capacitor through the design of relay module and adjustable capacitor. It can flexibly adjust the capacitance to simulate the influence of Y capacitor on insulation resistance measurement under different test scenarios, thereby effectively reducing measurement error and improving test accuracy. At the same time, it supports the test requirements under complex working conditions and adapts to the diversified requirements of high voltage system testing of new energy vehicles.

[0029] (2) By integrating a CAN communication module and a control module, this Y-capacitor simulator supports remote transmission of control commands and displays capacitance output data in real time using an OLED display module. This not only improves the convenience and efficiency of testing but also allows for timely monitoring of the test status, ensuring the controllability and safety of the testing process.

[0030] (3) This utility model, combined with the configuration of a filter capacitor, effectively suppresses electromagnetic interference and ensures signal integrity. At the same time, by accurately simulating the characteristics of a Y capacitor, it reduces electrical safety risks caused by impedance mismatch, providing a reliable guarantee for the safety testing of high-voltage systems in new energy vehicles. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a diagram showing the overall structure of the modules in this utility model;

[0033] Figure 2 This is a schematic diagram of the power supply module structure in this utility model;

[0034] Figure 3 This is a schematic diagram of the control module structure in this utility model;

[0035] Figure 4 This is a schematic diagram of the CAN communication module and OLED module in this utility model;

[0036] Figure 5 This is a schematic diagram of the relay module structure in this utility model. Detailed Implementation

[0037] The following describes in detail the design of a programmable Y-capacitor simulator with reference to the embodiments of this utility model. This utility model provides a programmable Y-capacitor simulator, which is mainly used to simulate the characteristics of a Y capacitor and to adjust and control the capacitance value through a programmable control method. Figure 1 As shown, this design includes a power supply module, a control module, a CAN communication module, an OLED display module, a relay module, a Header 4 through-hole four-pin connector, a CAN signal receiving terminal, a capacitor analog output terminal, a 3.3V filter capacitor, and a 12V filter capacitor. Its specific implementation is as follows:

[0038] like Figure 2As shown, the power supply module uses the MP1584EN chip, which includes VIN pin, EN pin, FREQ pin, BST pin, SW pin, FB pin, COMP pin, PAD pin, and GND pin.

[0039] The VIN pin connects to a 12V DC voltage and to one end of capacitor C12 and one end of capacitor C13. Capacitors C12 and C13 are connected in parallel, and the other ends of capacitors C12 and C13 are grounded. The VIN pin is the chip's input power supply pin, used to connect the input voltage.

[0040] The EN pin has one end of resistor R15 and one end of resistor R18 connected in series. The other end of resistor R15 is connected to a 12V DC voltage, and the other end of resistor R18 is grounded. The EN pin is the enable pin, used to control the power supply switching.

[0041] The FREQ pin is connected to one end of resistor R20, and the other end of resistor R20 is grounded. This is used to set the switching frequency. The switching power supply converts the input voltage to the required DC output voltage through high-speed switching of its internal MOSFETs (power switching transistors).

[0042] The SW pin connects the cathode of Zener diode D2 to one end of inductor L1. The anode of Zener diode D2 is grounded. The other end of inductor L1 is connected to one end of resistor R13 and one end of capacitor C14. The other end of resistor R13 is connected to the anode of LED D1. The cathode of LED D1 is grounded. Capacitor C14 is connected in parallel with capacitors C15, C16, and C17, which are then grounded. The SW pin connects to the external inductor and the output circuit and is the core node of the buck converter. The switching action of the internal MOSFET outputs a square wave voltage through the SW pin, which is filtered by the inductor and capacitors to form a stable output voltage.

[0043] The BST pin is connected to one end of capacitor C11, and the other end of capacitor C11 is connected to the SW pin. The BST pin forms a bootstrap circuit through an external capacitor, providing a drive voltage higher than the input voltage to ensure that the high-side MOSFET can be fully turned on.

[0044] The FB pin is connected to one end of resistor R16 and one end of resistor R19. The other end of resistor R16 is connected to the node between inductor L1 and resistor R13, and the other end of resistor R19 is grounded. The FB pin is connected to the output voltage through a voltage divider network. The chip adjusts the output voltage by detecting the voltage at the FB pin. Adjusting the voltage divider resistors allows for different output voltage settings.

[0045] The COMP pin is connected to one end of capacitor C18, the other end of capacitor C18 is connected to one end of resistor R23, and the other end of resistor R23 is grounded. The COMP pin connects to an external compensation network consisting of a resistor and capacitor, used to adjust the phase and gain characteristics of the control loop, ensuring stable system operation under various load conditions. The design of the compensation network needs to be determined based on the specific circuit parameters.

[0046] The PAD pin is grounded. The PAD is a heat sink on the bottom of the chip, connected to ground through a large copper foil on the PCB, used to dissipate the heat generated when the chip is working.

[0047] The GND pin is grounded. This is the chip's ground pin.

[0048] like Figure 3 As shown, the control module uses the STM32F103C8T6 chip. The STM32F103C8T6 chip includes the following pins: SWDIO, SWCLK, VBAT, VDD_1, VDD_2, VDD_3, VDDA, VSSA, VSS_1, VSS_2, VSS_3, CANRX_DZ60, CANTX_DZ60, I2C_SCL, I2C_SDA, H10A0, H10A1, H10A2, H1A0, H1A1, H1A2, and H1A3.

[0049] The SWDIO pin is connected to pin 2 of the Header 4 through-hole four-pin connector, and the SWCLK pin is connected to pin 3 of the Header 4 through-hole four-pin connector. The SWDIO and SWCLK pins control the programming process.

[0050] The VBAT, VDD_1, VDD_2, and VDD_3 pins are connected in parallel. One end of resistor R9 is connected to the VBAT pin, and the other end of resistor R9 is connected to the VDDA pin and one end of capacitor C10. The other end of capacitor C10 is grounded. One end of capacitor C9 is connected to the VDD_3 pin, and the other end of capacitor C9 is grounded. The VBAT, VDD_1, VDD_2, and VDD_3 pins are connected to a 3.3V DC voltage via the MP1584EN chip. Pins VDD_1, VDD_2, and VDD_3 are digital power input pins. The VBAT pin is the backup battery voltage input pin. The VDDA pin is the analog power input pin.

[0051] The VSSA pin is connected to one end of resistor R7. Pins VSS_1, VSS_2, and VSS_3 are connected in parallel to the other end of resistor R7, which is grounded. The VSSA pin is the analog ground pin. Pins VSS_1, VSS_2, and VSS_3 are the digital ground pins.

[0052] The CANRX_DZ60 and CANTX_DZ60 pins are connected to the CAN communication module. The CANRX_DZ60 pin is the CAN bus receive pin. The CANTX_DZ60 pin is the CAN bus transmit pin.

[0053] The I2C_SCL pin is connected to pin 2 of the OLED display module, and the I2C_SDA pin is connected to pin 1 of the OLED display module. The I2C_SCL pin is the I2C serial clock pin. The I2C_SDA pin is the I2C serial data pin.

[0054] Pins H10A0, H10A1, H10A2, H1A0, H1A1, H1A2, and H1A3 are connected to the relay module. Pins H10A0, H10A1, H10A2, H1A0, H1A1, H1A2, and H1A3 are general-purpose I / O pins.

[0055] like Figure 4 As shown, the CAN communication module uses the SN65HVD230D CAN transceiver, which includes the S pin, CANH pin, CANL pin, TXD pin, RXD pin, VCC pin, and GND pin.

[0056] The S pin is grounded to select high-speed mode. The S pin is used to switch the transceiver's operating mode.

[0057] A resistor RC1 is connected in parallel between the CANH and CANL pins. One end of a Zener diode is connected in parallel with RC1, and the other end of the Zener diode is grounded. The CANH pin is the high-level differential signal pin of the CAN bus. The CANL pin is the low-level differential signal pin of the CAN bus. The CANH and CANL pins form the differential signal pair of the CAN bus.

[0058] The TXD pin is connected to the CANTX_DZ60 pin of the STM32F103C8T6 chip, and the RXD pin is connected to the CANRX_DZ60 pin of the STM32F103C8T6 chip. The TXD pin receives digital signals from the STM32F103C8T6 chip and is used to send data to the CAN bus. The RXD pin converts the differential signals received from the CAN bus into digital signals and outputs them to the STM32F103C8T6 chip.

[0059] The VCC pin is connected to one end of capacitor CC1 and one end of capacitor CC2, which are connected in parallel. The other ends of capacitors CC1 and CC2 are grounded. The VCC pin is connected to a 3.3V voltage. The VCC pin is the power input pin.

[0060] The GND pin is grounded. The GND pin is the grounding pin.

[0061] like Figure 4 As shown, the CAN signal receiving terminal uses the KF301-2P terminal block, which includes pin 1 and pin 2. Pin 1 connects to the CANL terminal of the external CAN device, and pin 2 connects to the CANH terminal of the external CAN device. The CAN signal receiving terminal is used to connect to an external CAN device and receive control commands from the CAN device.

[0062] like Figure 4 As shown, the Header 4 through-hole four-pin connector includes pin 1, pin 2, pin 3 and pin 4.

[0063] Pin 1 is connected to an external 3.3V voltage. Pin 2 is connected to the SWDIO pin of the STM32F103C8T6 chip, and pin 3 is connected to the SWCLK pin of the STM32F103C8T6 chip. Pin 4 is grounded.

[0064] like Figure 4 As shown, the OLED display module includes pin 1, pin 2, pin 3 and pin 4.

[0065] Pin 1 is connected to the I2C_SCL pin of the STM32F103C8T6 chip, and pin 2 is connected to the I2C_SDA pin of the STM32F103C8T6 chip. Pin 3 is connected to an external 3.3V voltage, and pin 4 is grounded.

[0066] like Figure 4 As shown, the 3.3V filter capacitor is connected to an external 3.3V voltage and then grounded after being connected in series with another capacitor. The 12V filter capacitor is connected to an external 12V voltage and then grounded after being connected in parallel with another capacitor bank. The 3.3V and 12V filter capacitors, by being connected to the DC power supply and grounded, serve to filter and decouple, reduce noise, and make the power supply output smoother and more stable.

[0067] like Figure 5 As shown, the relay module includes an MC1413 chip, which is powered by a 12V DC voltage. The MC1413 chip includes pins P1, P2, P3, P4, P5, P6, P7, O1, O2, O3, O4, O5, O6, O7, VCC, and GND. Pin P1 is connected to pin H10A2 of the STM32F103C8T6 chip, pin P2 is connected to pin H10A1 of the STM32F103C8T6 chip, and pin P3 is connected to pin H10A0 of the STM32F103C8T6 chip. The circuit is as follows: Pin P4 is connected to pin H1A3 of the STM32F103C8T6 chip; pin P5 is connected to pin H1A2 of the STM32F103C8T6 chip; pin P6 is connected to pin H1A1 of the STM32F103C8T6 chip; pin P7 is connected to pin H1A0 of the STM32F103C8T6 chip; pins O1, O2, O3, O4, O5, O6, and O7 are connected to an HF46F / 12-HS1 relay. The HF46F / 12-HS1 relay includes a coil and an armature. One end of the coil is connected to a 12V voltage, and the other end is connected to a pin. One end of the armature is connected to an external device, and the other end is connected to a capacitor. The capacitor is connected to a capacitor analog output terminal, which includes pin 1 and pin 2. Pin 1 of the capacitor analog output terminal is connected to an external device, and pin 2 of the capacitor analog output terminal is connected to the capacitor. The total output capacity of the capacitors connected to each relay is C = 2. n-1 *0.1uF, where n is the nth relay.

[0068] The relay armature connected to pin O1 is connected to an external device at one end, and capacitors C45, C46, ​​C47, and C48 are connected to the other end. These capacitors are connected in parallel to pin 2 of the analog output terminal. Capacitor C45 is 2.2uF, C46 is 2.2uF, C47 is 1uF, and C48 is 1uF.

[0069] The relay armature connected to pin O2 is connected to an external device at one end, and capacitors C43 and C44 are connected to the other end. C43 and C44 are connected in parallel and then connected to pin 2 of the analog output terminal. C43 is 2.2uF and C44 is 1uF.

[0070] The relay armature connected to pin O3 is connected to an external device at one end, and capacitors C39, C40, C41, and C42 are connected to the other end. These capacitors are connected in parallel and then connected to pin 2 of the analog output terminal. Capacitor C39 is 1uF, capacitor C40 is 470nF, capacitor C41 is 100nF, and capacitor C42 is 33nF.

[0071] The relay armature connected to pin O4 is connected to an external device at one end, and capacitors C36, C37, and C38 at the other end. These capacitors are connected in parallel to pin 2 of the analog output terminal. Capacitor C36 is 22nF, capacitor C37 is 100nF, and capacitor C38 is 680nF.

[0072] The relay armature connected to pin O5 is connected to an external device at one end, and capacitors C33, C34, and C35 at the other end. These capacitors are connected in parallel and then to pin 2 of the analog output terminal. Capacitor C33 is 220nF, capacitor C34 is 100nF, and capacitor C35 is 82nF.

[0073] The relay armature connected to pin O6 is connected to an external device at one end, and capacitors C31 and C32 are connected to the other end. Capacitors C31 and C32 are connected in parallel and then connected to pin 2 of the analog output terminal. Both C31 and C32 are 100nF.

[0074] The relay armature connected to pin O7 is connected to an external device at one end and to capacitor C30 at the other end. Capacitor C30 is connected to pin 2 of the analog output terminal. Capacitor C30 has a value of 100nF.

[0075] Control circuit switching principle:

[0076] Command reception and logic processing: External CAN devices send output control commands through the CANH and CANL interfaces. After receiving the commands, the STM32F103C8T6 chip performs logic operations and outputs high and low level signals according to the operation results, where 1 represents high level and 0 represents low level.

[0077] Relay Module Control: The MC1413 chip in the relay module receives high and low level commands from the STM32F103C8T6 chip to perform on or off operations. When the microcontroller outputs a high level, the transistor in the MC1413 chip saturates and conducts, outputting a low level; upon receiving this low-level signal, the relay coil is energized, controlling the armature connection, thus establishing a circuit connection. In this way, external commands ultimately control the on / off state of the circuit.

[0078] Instructions for use:

[0079] Connect the power supply: Connect the 12V DC power supply to the simulator's power interface. At this time, the power indicator light will light up, and the OLED display will show basic information, indicating that the device has started normally.

[0080] Connecting CAN communication devices: Connect external CAN devices to the simulator via CANH and CANL terminals to ensure normal communication connection.

[0081] Sending control commands: Control messages are sent via an external CAN communication device to control a specified analog capacitor value. For example, sending message 0x01 will cause the STM32F103C8T6 chip to output a 7-bit binary value of 0000001, the MC1413 chip to output 1111110, and the relay connected to pin O7 to conduct, outputting an analog capacitor with a capacitance of 0.1uF. Sending message 0x10 will cause the STM32F103C8T6 chip to output a 7-bit binary value of 0010000, the MC1413 chip to output 1101111, and the relay connected to pin O3 to conduct, outputting an analog capacitor with a capacitance of 1.6uF. After the command is sent, the OLED display will show the current analog capacitance in real time.

[0082] Connecting to the test equipment: Connect the two leads to the output of the Y capacitor simulator, and connect the other end to the target device circuit to simulate the required capacitance value.

[0083] Capacitance switching: When testing different capacitance values, there is no need to disconnect the circuit; simply send a new control command via the CAN device to switch the target capacitance. The OLED display will update and show the current analog capacitance in real time.

[0084] The embodiments of this utility model have been described in detail above. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A Y-capacitor simulator, characterized in that: The system includes a relay module: the relay module includes a chip, multiple access groups and an output terminal, each access group includes a relay and a parallel capacitor group, the relay and the parallel capacitor group are connected in series, one pin of the chip is connected to one end of the access group, and the other end of the access group is connected to the output terminal; The chip controls the capacitor output of the access group by changing the output level. When the pin connected to the access group outputs a high level, the relay in the access group is turned off, and the parallel capacitor group in the access group does not output capacitor. When the pin connected to the access group outputs a low level, the relay in the access group is turned on, and the parallel capacitor group in the access group outputs capacitor.

2. The Y-capacitor simulator according to claim 1, characterized in that, The plurality of parallel capacitor banks includes n parallel capacitor banks, and the output capacitance of the nth parallel capacitor bank is: *0.1uF.

3. The Y-capacitor simulator according to claim 1, characterized in that, The chip used is the MC1413 chip, and the relay used is the HF46F / 12-HS1 relay.

4. The Y-capacitor simulator according to claim 1, characterized in that, The Y-capacitor simulator also includes a power supply module, which uses an MP1584EN chip. The MP1584EN chip includes a VIN pin and an SW pin. The VIN pin is connected to a 12V DC voltage and to one end of capacitor C12 and one end of capacitor C13. The other ends of capacitor C12 and C13 are grounded. The SW pin is connected to capacitors C14, C15, C16, and C17. Capacitors C14, C15, C16, and C17 are connected in parallel and then grounded.

5. The Y-capacitor simulator according to claim 4, characterized in that, The SW pin is connected in series with a resistor R13, and the resistor R13 is connected in series with an LED D1, which is grounded.

6. The Y-capacitor simulator according to claim 1, characterized in that, The Y capacitor simulator also includes a control module, which uses an STM32F103C8T6 chip.

7. The Y-capacitor simulator according to claim 1, characterized in that, The Y-capacitor simulator also includes a CAN communication module, which uses an SN65HVD230D CAN transceiver. The SN65HVD230D CAN transceiver includes an S pin, which is grounded.

8. The Y-capacitor simulator according to claim 7, characterized in that, The CAN communication module is connected to a CAN signal receiving terminal, which uses a KF301-2P terminal block. The KF301-2P terminal block is connected to an external CAN device, which is a device that sends control commands.

9. The Y-capacitor simulator according to claim 1, characterized in that, The Y-capacitor simulator also includes an OLED display module, which displays the capacitance output by the relay module.

10. The Y-capacitor simulator according to claim 1, characterized in that, The Y-capacitor simulator also includes a 3.3V filter capacitor and a 12V filter capacitor. The 3.3V filter capacitor is connected in series with the 3.3V DC power supply and grounded; the 12V filter capacitor is connected in parallel with the 12V DC power supply and grounded.

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