Testing device for radio frequency board of vehicle charging gun
By designing a testing device for the RF board of vehicle charging guns, the problem of untested RF boards after production was solved, enabling efficient and flexible functional testing and reducing failure rate and testing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-24
AI Technical Summary
In the existing technology, Tesla's charging gun radio frequency board is not thoroughly tested after production, resulting in a failure rate of 0.5%, and on-vehicle testing is costly and complex.
A testing device for the RF board of a vehicle charging gun was designed, including a status indicator module, an RF receiver, an MCU module, and a power supply module. It can easily test the function of the RF board at the mains power supply, adapt to the carrier frequency requirements of different markets, and demodulate the fundamental wave signal through the MCU module to control the indicator light to display the status.
It significantly reduced the charging gun failure rate, improved the flexibility and accuracy of testing, reduced production and maintenance costs, and simplified the operation process.
Smart Images
Figure CN224035564U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of charging gun, especially a kind of testing device for vehicle charging gun radio frequency board. BACKGROUND
[0002] When Tesla owner needs to charge vehicle, they only need to click the specific button on charging gun to trigger the process of automatic opening of vehicle charging port.Currently, the charging gun compatible with the cover opening function of Tesla vehicle charging port is usually not detected in detail after production, or only through simple visual inspection, which leads to about 0.5% failure rate.In addition, although using real vehicle for detection can provide more accurate results, the requirement for detection environment is higher, not only complete vehicle equipment needs to be equipped, but also professional test site and personnel are needed, which increases detection cost and complexity.In order to solve these problems, the utility model provides a kind of testing device specially used for Tesla charging gun radio frequency board.The testing device can conveniently realize radio frequency board function test of charging gun before leaving factory, so as to significantly reduce failure rate.The device is compact and light, and the weight is less than 1kg, which is convenient to carry and can be tested anywhere with mains supply, greatly improving the flexibility and convenience of use.Through this efficient detection means, not only product quality can be improved, but also service interruption risk caused by equipment failure can be greatly reduced. SUMMARY
[0003] In order to conveniently realize radio frequency board function test of charging gun before leaving factory, the utility model provides a kind of testing device for vehicle charging gun radio frequency board, comprising:
[0004] State indicating module, for displaying the function state of vehicle charging gun radio frequency board;
[0005] Radio frequency receiver, for receiving and demodulating radio frequency signal emitted by vehicle charging gun radio frequency board;
[0006] MCU module, for detecting fundamental wave signal demodulated by radio frequency receiver, and controlling corresponding indicator light in state indicating module based on detection result.
[0007] Further, the testing device further comprises:
[0008] Power module, for providing power supply voltage to each module in testing device.
[0009] Further, the power module comprises:
[0010] USB interface, for accessing +5V external power supply voltage;
[0011] Low dropout linear regulator, for converting external power supply voltage accessed by USB interface into stable 3.3V voltage;
[0012] A filter unit is used for smoothing and filtering the 3.3V voltage output by the low-dropout linear regulator, and providing the smoothed and filtered power supply voltage to each module in the test device.
[0013] Further, the state indicating module comprises:
[0014] A first indicating unit is used for indicating the working state of the power supply module.
[0015] A second indicating unit is used for indicating the working state of the MCU module.
[0016] A third indicating unit is used for indicating the functional state of the vehicle charging gun radio frequency board.
[0017] Further, the radio frequency receiver is a receiver using 315MHz as the carrier frequency, or a receiver using 433MHz as the carrier frequency.
[0018] Further, the test device further comprises:
[0019] A clock module is used for providing a clock signal to the MCU module.
[0020] The clock module comprises at least one crystal oscillator, which is connected to the clock input port of the MCU module and generates a clock signal with a fixed frequency.
[0021] Further, the MCU module is used for detecting the fundamental wave signal demodulated by the radio frequency receiver based on the clock signal provided by the clock module.
[0022] Further, the test device further comprises:
[0023] A reset module is used for restarting the MCU module.
[0024] Further, the test device further comprises:
[0025] A BOOT jumper module comprising a first pin BOOT0 and a second pin BOOT1 is used for controlling the start mode of the MCU module based on the level state of the first pin BOOT0 and the second pin BOOT1.
[0026] Further, the start mode of the MCU module comprises:
[0027] A main Flash memory start mode, a memory start mode and an embedded SRAM start mode.
[0028] Compared with the prior art, the utility model at least has the following beneficial effects:
[0029] (1) The utility model discloses a test device includes: state indicating module is used to show the function state of vehicle charging gun radio frequency board, radio frequency receiver is used to receive and demodulate the radio frequency signal that vehicle charging gun radio frequency board sends out, MCU module is used to detect the fundamental wave signal that radio frequency receiver demodulates, and based on the control corresponding pilot lamp of state indicating module light -on of detection result, namely this test device can demodulate and analyze the radio frequency signal received, and accordingly control the state of pilot lamp, and the radio frequency board function inspection of charging gun before factory is realized conveniently.
[0030] (2) In the utility model, radio frequency receiver can be the receiver of using 315MHz as carrier frequency, or the receiver of using 433MHz as carrier frequency, to adapt to the standard requirement of different market, when using different receivers, do not need to replace other hardware and program in the utility model, greatly improve the universality of the utility model test device.
[0031] (3) The utility model passes through USB interface and access external power supply, and utilizes low dropout linear regulator (LDO) to convert voltage into stable 3.3V output, passes through filter unit further smooth and filters again, ensure that each module obtains high quality power supply.
[0032] (4) In the utility model, the first indicating unit shows the working state of power module, and the second indicating unit shows the working state of MCU module, and the third indicating unit is used to indicate the function state of vehicle charging gun radio frequency board, so that the user can intuitively understand the running condition of the device. BRIEF DESCRIPTION OF DRAWINGS
[0033] Figure 1 It is a module structure diagram for the test device of vehicle charging gun radio frequency board;
[0034] Figure 2 It is the circuit diagram of MCU module;
[0035] Figure 3 It is the circuit diagram of state indicating module;
[0036] Figure 4 It is the circuit diagram of radio frequency receiver of using 315MHz as carrier frequency;
[0037] Figure 5 It is the circuit diagram of USB interface;
[0038] Figure 6 It is the circuit diagram of low dropout linear regulator;
[0039] Figure 7 It is the circuit diagram of filter unit;
[0040] Figure 8Circuit diagram for clock module;
[0041] Figure 9 Circuit diagram for reset module;
[0042] Figure 10 Circuit diagram for BOOT jumper module;
[0043] Figure 11 Circuit diagram for SWD interface. DETAILED DESCRIPTION
[0044] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the accompanying drawings, but the present application is not limited to these embodiments.
[0045] When a Tesla vehicle needs to be charged, the user only needs to click a specific button on the charging gun to trigger the automatic opening of the vehicle's charging port. This operation is simple and convenient, and the working principle behind it is that after clicking the button on the charging gun, the charging gun will emit a fixed format square wave signal. If the receiver on the Tesla vehicle detects that the square wave signal meets the preset standard, the system will identify that it needs to be charged and automatically open the charging cover. This design not only improves the user experience, but also ensures the safety and reliability of the charging process. Currently, charging guns compatible with the Tesla vehicle charging port opening cover function are usually not subjected to detailed detection after production, or only subjected to simple visual inspection, which results in a failure rate of about 0.5%. In addition, although using a real vehicle for detection can provide more accurate results, it has higher requirements for the detection environment, not only requiring complete vehicle equipment, but also requiring professional test sites and personnel, increasing the detection cost and complexity.
[0046] In order to verify whether the function of the Tesla charging gun emission module, i.e., the radio frequency board, is normal, a receiver that can simulate the receiver on the Tesla vehicle to detect the charging gun signal is needed. The test device proposed in this embodiment is designed for this purpose, which can simulate the receiver on the Tesla vehicle, detect the fundamental wave signal demodulated by the receiver, and analyze the working state of the charging gun radio frequency board according to the detection result, to ensure its reliability and accuracy in actual use. Specifically:
[0047] In order to conveniently implement the function inspection of the radio frequency board of the charging gun before it leaves the factory, as shown in the Figure 1 The utility model proposes a test device for the radio frequency board of a vehicle charging gun, which comprises:
[0048] a state indication module for displaying the function state of the radio frequency board of the vehicle charging gun;
[0049] a radio frequency receiver for receiving and demodulating the radio frequency signal emitted by the radio frequency board of the vehicle charging gun;
[0050] The radio frequency receiver is a receiver using 315MHz as the carrier frequency, or a receiver using 433MHz as the carrier frequency.
[0051] The signal sent by the Tesla charging gun uses 315MHz (for the US market) or 433MHz (for the European or Chinese market) as the carrier frequency. The test device is designed flexibly, which can test both 315MHz charging guns and 433MHz charging guns. The only difference is that a 315MHz receiver (i.e., the circuit diagram in the figure Figure 4 : radio frequency receiver using 315MHz as the carrier frequency) is used when testing 315MHz charging guns, while a 433MHz receiver is used when testing 433MHz charging guns. Except for this, other hardware and program parts are exactly the same, which makes the test device highly versatile and flexible, and can adapt to the standard requirements of different markets. This design significantly improves test efficiency and reduces production and maintenance costs.
[0052] The MCU module as shown in Figure 2 is used to detect the fundamental wave signal demodulated by the radio frequency receiver, and control the corresponding indicator light in the state indication module based on the detection result.
[0053] Figure 2 The peripheral interfaces JP3 and JP4 are also included in the MCU module.
[0054] The test device further includes:
[0055] The power module is used to provide power supply voltage to each module in the test device.
[0056] The power module includes:
[0057] The USB interface as shown in Figure 5 is used to access the +5V external power supply voltage;
[0058] The low-dropout linear regulator as shown in Figure 6 is used to convert the external power supply voltage accessed by the USB interface into a stable 3.3V voltage;
[0059] The filter unit as shown in Figure 7 is used to smooth and filter the 3.3V voltage output by the low-dropout linear regulator, and provide the smoothed and filtered power supply voltage to each module in the test device.
[0060] The test device further includes:
[0061] The clock module as shown in Figure 8 is used to provide a clock signal for the MCU module;
[0062] The clock module comprises at least one crystal oscillator connected to a clock input port (OSCIN, OSCOUT, PC14, PC15) of the MCU module and generating a clock signal of fixed frequency.
[0063] The MCU module is configured to detect the fundamental wave signal demodulated by the radio frequency receiver based on the clock signal provided by the clock module.
[0064] The fundamental wave signal transmitted by the Tesla charging gun comprises 118 square wave signals with different duty cycles and periods, wherein the low level time is between 470 microseconds and 1250 microseconds, and the high level time is between 105 microseconds and 705 microseconds (such a complex signal design makes the probability of false triggering extremely low, theoretically less than one in a billion. After a long period of actual testing (more than 10 days), no false triggering has occurred, verifying the high reliability of the signal design. Therefore, the test device based on this signal mechanism can meet the requirements of production testing, ensuring that each charging gun radio frequency board functions normally and stably).
[0065] The core of the test device is to detect the fundamental wave signal demodulated by the radio frequency receiver through the MCU module, and to perform synchronous processing using the high-precision clock signal provided by the clock module. The clock module comprises at least one crystal oscillator connected to the clock input port of the MCU, generating a clock signal of fixed frequency, ensuring that the MCU module can still operate stably and achieve high-precision data processing in a complex electromagnetic environment. The MCU module counts the square waves that meet the low level time and high level time requirements through the program. If 118 square wave signals (fundamental wave signals) that meet the conditions are continuously received, it indicates that the transmission signal is correct, and the green indicator light (LED3) is turned on to indicate that the received signal is correct, thereby confirming that the radio frequency board of the charging gun functions normally. If the number of counts is less than 118, it is considered that the signal is incorrect, at which time the counter will be cleared and will wait for the next signal that meets the conditions to start counting again. This precise signal analysis and indication mechanism not only improves the accuracy of detection, but also simplifies the operation process, ensuring high efficiency and reliability in the production process.
[0066] As shown in Figure 3 The state indication module comprises:
[0067] The first indication unit (LED1 with bright red light) is configured to indicate the working state of the power module; the constant light of LED1 represents normal power supply;
[0068] The second indication unit (LED2 with bright red light) is configured to indicate the working state of the MCU module; the flickering of LED2 represents that the controller is in standby state;
[0069] The third indicator unit (LED3 with a bright green light) is used to indicate the functional status of the vehicle charging gun's radio frequency board. A flashing LED3 indicates that the tested radio frequency board is functioning normally.
[0070] The testing apparatus also includes:
[0071] like Figure 9 The reset module shown is used to restart the MCU module.
[0072] The testing apparatus also includes:
[0073] Including the first pin BOOT0 and the second pin BOOT1, as shown Figure 10 The BOOT jumper module shown is used to control the startup mode of the MCU module based on the level states of the first pin BOOT0 and the second pin BOOT1.
[0074] The startup modes of the MCU module include:
[0075] Main Flash memory boot mode, memory boot mode and embedded SRAM boot mode.
[0076] It's important to explain here that the states of the BOOT0 and BOOT1 pins determine the startup mode of the MCU module. These pins can be set to a high level (1) or a low level (0) via external circuitry (e.g., through jumpers, switches, or direct connection to power or ground). The specific level combinations and their corresponding startup modes are as follows:
[0077] 1. Booting from main Flash memory (MCU modules boot from internal Flash memory; this is the most common operating mode and is suitable for product deployment):
[0078] Connect the BOOT0 pin to ground (GND), which sets it to a low level (0).
[0079] The BOOT1 pin can be left floating or connected to any state, as it does not function in this case.
[0080] 2. Boot from memory (The MCU module boots from memory, allowing firmware updates via a serial interface (such as USART):
[0081] Connect the BOOT0 pin to the power supply (VCC), which sets it to a high level (1).
[0082] Connect the BOOT1 pin to ground (GND), which sets it to low level (0).
[0083] 3. Booting from embedded SRAM (MCU modules boot from embedded SRAM, typically for debugging purposes):
[0084] Connect the BOOT0 pin to the power supply (VCC), which sets it to a high level (1).
[0085] Connect the BOOT1 pin to the power supply (VCC) as well, i.e. set it to high level (1).
[0086] After changing the states of the BOOT0 and BOOT1 pins, the MCU module needs to be reset via the reset module.
[0087] The testing apparatus also includes:
[0088] like Figure 11 The SWD interface shown is used for programming and debugging MCU modules, facilitating rapid iterative development and troubleshooting for developers.
[0089] The testing device of this utility model includes: a status indicator module for displaying the functional status of the vehicle charging gun RF board; an RF receiver for receiving and demodulating the RF signal emitted by the vehicle charging gun RF board; and an MCU module for detecting the fundamental signal demodulated by the RF receiver and controlling the corresponding indicator light in the status indicator module to illuminate based on the detection result. That is, the testing device can demodulate and analyze the received RF signal and control the status of the indicator light accordingly, thus easily realizing the functional testing of the RF board of the charging gun before it leaves the factory.
[0090] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.
[0091] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0092] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0093] In addition, the technical solutions among various embodiments of the present application can be combined with each other, but it must be based on that a person skilled in the art can realize, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.
Claims
1. A testing device for the radio frequency board of a vehicle charging gun, characterized in that, include: Status indicator module is used to display the functional status of the vehicle charging gun radio frequency board; Radio frequency receiver, used to receive and demodulate the radio frequency signal emitted by the radio frequency board of the vehicle charging gun; The MCU module is used to detect the fundamental signal demodulated by the RF receiver and control the corresponding indicator lights in the status indicator module to light up based on the detection results.
2. The testing device for the radio frequency board of a vehicle charging gun according to claim 1, characterized in that, The testing apparatus also includes: The power supply module is used to provide power voltage to the various modules in the test equipment.
3. The testing device for the radio frequency board of a vehicle charging gun according to claim 2, characterized in that, The power module includes: The USB interface is used to connect to an external power supply voltage of +5V. A low-dropout linear regulator is used to convert the external power supply voltage connected to the USB interface into a stable 3.3V voltage; The filtering unit is used to smooth and filter the 3.3V output voltage of the low dropout linear regulator and provide the smoothed and filtered power supply voltage to various modules in the test device.
4. The testing device for the radio frequency board of a vehicle charging gun according to claim 1, characterized in that, The status indication module includes: The first indicator unit is used to indicate the working status of the power module; The second indicator unit is used to indicate the working status of the MCU module; The third indicator unit is used to indicate the functional status of the vehicle charging gun radio frequency board.
5. A testing device for a vehicle charging gun RF board according to claim 1, characterized in that, The radio frequency receiver is either a receiver using 315MHz as the carrier frequency or a receiver using 433MHz as the carrier frequency.
6. A testing device for a vehicle charging gun RF board according to claim 1, characterized in that, The testing apparatus also includes: The clock module is used to provide clock signals to the MCU module; The clock module includes at least one crystal oscillator, which is connected to the clock input port of the MCU module and generates a clock signal at a fixed frequency.
7. A testing device for a vehicle charging gun RF board according to claim 6, characterized in that, The MCU module is used to detect the fundamental wave signal demodulated by the RF receiver based on the clock signal provided by the clock module.
8. A testing device for a vehicle charging gun RF board according to claim 1, characterized in that, The testing apparatus also includes: The reset module is used to restart the MCU module.
9. A testing device for a vehicle charging gun RF board according to claim 1, characterized in that, The testing apparatus also includes: The module includes a BOOT jumper module with a first pin BOOT0 and a second pin BOOT1, which is used to control the startup mode of the MCU module based on the level states of the first pin BOOT0 and the second pin BOOT1.
10. A testing device for a vehicle charging gun RF board according to claim 9, characterized in that, The startup modes of the MCU module include: Main Flash memory boot mode, memory boot mode and embedded SRAM boot mode.