Electric vehicle instrument communication circuit

Abstract

This utility model relates to the field of communication technology for electric vehicle instruments, and discloses a communication circuit for electric vehicle instruments, including a microcontroller and a wireless radio frequency (RF) receiving and regulating module. The RF receiving and regulating module includes a power supply unit, a wireless chip, a wireless RF signal receiving unit, a clock unit, and an output unit. The wireless chip is connected to the power supply unit, the wireless RF signal receiving unit, the clock unit, and the output unit. The output unit is connected to the microcontroller. The power supply unit provides a stable voltage to the wireless chip, which receives, processes, and transmits information. The wireless RF signal receiving unit receives wireless remote control commands. The clock unit provides a clock reference to ensure synchronized operation of the internal circuitry of the wireless chip. The output unit transmits signals to the microcontroller, which processes the signals transmitted by the output unit. This utility model reduces signal reflection and loss, improves signal reception sensitivity, and has low cost.

Description

Technical Field

[0001] This utility model relates to the field of communication technology for electric vehicle instruments, and specifically to communication circuits for electric vehicle instruments. Background Technology

[0002] To enable electric bicycle users to conveniently perform operations such as unlocking, locking, locating, starting, and alarming, and to improve the user experience, users can use wireless remote control commands to perform these operations.

[0003] Currently, wireless remote control commands are often achieved through the communication circuit of the electric vehicle instrument panel. However, the current communication circuit of the electric vehicle instrument panel often uses an external antenna, which is costly, aesthetically unappealing, and has low integration. There is an urgent need for an electric vehicle instrument panel communication circuit that can reduce signal reflection and loss, improve signal reception sensitivity, and has the characteristics of low cost, good aesthetics, small size, and high integration to achieve wireless control functions. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a communication circuit for electric vehicle instrument, which can reduce signal reflection and loss, improve signal receiving sensitivity, and is also low in cost, aesthetically pleasing, compact in size and highly integrated.

[0005] The technical solution adopted by this utility model is as follows: A communication circuit for an electric vehicle instrument includes a microcontroller and a wireless radio frequency receiving and regulating module. The wireless radio frequency receiving and regulating module includes a power supply unit, a wireless chip, a wireless radio frequency signal receiving unit, a clock unit, and an output unit. The wireless chip is connected to the power supply unit, the wireless radio frequency signal receiving unit, the clock unit, and the output unit respectively. The output unit is connected to the microcontroller. The power supply unit provides a stable voltage to the wireless chip. The wireless chip receives, processes, and transmits information. The wireless radio frequency signal receiving unit receives wireless remote control commands. The clock unit provides a unified clock reference, allowing the internal circuits of the wireless chip to work synchronously and in coordination. The output unit transmits the regulated signal from the wireless chip to the microcontroller, and the microcontroller processes the signal transmitted by the output unit. The wireless radio frequency signal receiving unit includes an onboard antenna, a second resistor, a fourth capacitor, a first inductor, a fifth capacitor, and a second inductor. One end of the second resistor is connected to the onboard antenna. One end of the fourth capacitor and one end of the second inductor are connected in parallel and then connected to radio frequency ground. The other end of the second resistor, the other end of the fourth capacitor, the other end of the second inductor, and one end of the fifth capacitor are connected in sequence. The other end of the fifth capacitor and one end of the first inductor are connected in parallel and then connected to the ANT pin of the wireless chip. The other end of the first inductor is connected to radio frequency ground.

[0006] The principle of the technical solution: The user issues remote control commands (such as locking, unlocking, finding the vehicle, starting, etc.) via the remote control. The wireless radio frequency signal receiving unit captures the remote control command signal and transmits the corresponding remote control command signal to the wireless chip. The wireless chip processes the received signal and transmits the processed digital signal to the microcontroller via the output unit. The microcontroller controls the electric vehicle's instrument panel to execute the corresponding operation decisions (such as locking, unlocking, finding the vehicle, starting, etc.) based on the received digital signal.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model uses an onboard antenna. Compared with traditional external antennas, the onboard antenna is integrated with the circuit board, reducing assembly steps. The onboard antenna is hidden inside the vehicle body or below the display screen, with no exposed parts. It is low in cost, aesthetically pleasing, compact in size, and highly integrated. The onboard antenna can receive wireless radio frequency signals in the 433MHz band. Remote control command reception and processing are realized through a microcontroller and a wireless radio frequency receiving and modulation module. The second resistor, fourth capacitor, first inductor, fifth capacitor, and second inductor in the wireless radio frequency signal receiving unit can form a radio frequency matching network, so that the radio frequency signal received by the onboard antenna can be transmitted to the ANT pin of the wireless chip with maximum efficiency, reducing signal reflection and loss, and improving receiving sensitivity.

[0008] In a preferred embodiment of this utility model, the power supply unit includes a first resistor, a first capacitor, a second capacitor, and a third capacitor. One end of the first resistor is connected to the instrument power supply. One end of the first capacitor and one end of the second capacitor are connected in parallel and then connected to the radio frequency ground. The other end of the first capacitor, the other end of the second capacitor, and the other end of the first resistor are connected in parallel and then connected to the VDD pin of the wireless chip. One end of the third capacitor is connected to the CTH pin of the wireless chip, and the other end of the third capacitor is connected to the radio frequency ground.

[0009] Beneficial effects: The input power (+5V) is converted into a voltage suitable for the 433MHz module through the first resistor (200Ω). The first resistor has a current limiting function. The second and third capacitors are power supply filter capacitors, which filter out high and low frequency ripple in the power supply, ensuring that the power supply to the wireless chip is stable and clean, so that the wireless chip can work normally.

[0010] In a preferred embodiment of the present invention, the clock unit includes a crystal oscillator, with the two crystal oscillator GND pins and the crystal oscillator OUT pin all connected to the radio frequency ground, and the crystal oscillator NC pin connected to the REFOSC pin of the wireless chip.

[0011] Beneficial effects: Crystal oscillators provide stable clock signals for wireless chips, ensuring that the internal circuits (mixers, demodulators, etc.) of the wireless chip work at a precise rhythm, thereby improving the accuracy and stability of the wireless chip's signal processing.

[0012] In a preferred embodiment of this utility model, the output unit includes a sixth capacitor. One end of the sixth capacitor is connected in parallel with the DO pin of the wireless chip and then connected to the microcontroller. The other end of the sixth capacitor is connected to the radio frequency ground.

[0013] In a preferred embodiment of this utility model, the wireless radio frequency receiving and modulation module further includes a wake-up unit. The wake-up unit is connected to the wireless chip and is used to wake up the microcontroller. The wake-up unit includes a third resistor, one end of which is connected to the SHUT pin of the wireless chip, and the other end of which is connected to the microcontroller.

[0014] In this solution, the user sends a wake-up signal via remote control. The wireless chip receives and modulates this signal. If the signal meets the preset wake-up conditions (such as a specific frequency, encoding, or data format), the wireless chip will generate a wake-up pulse or level change to trigger the microcontroller's wake-up interrupt. The microcontroller will then send a start command to the motor controller.

[0015] Beneficial effects: When not in continuous operation, it can enter a low-power sleep state. When a specific signal is received or a specific condition is met, the microcontroller is woken up, which further reduces the overall power consumption of the system and improves energy efficiency.

[0016] In a preferred embodiment of this utility model, a fault monitoring module is also included. The fault monitoring module includes a controller and a dual-channel unit. The dual-channel unit includes a main feedback sub-unit and a slave feedback sub-unit. The main feedback sub-unit includes a fourth resistor, a fifth resistor, and a seventh capacitor. One end of the fourth resistor is connected in parallel with the controller and then connected to one end of the fifth resistor. The other end of the fourth resistor is connected to a general ground. The other end of the fifth resistor is connected in parallel with one end of the seventh capacitor and then connected to a microcontroller. The other end of the seventh capacitor is connected to a general ground. The slave feedback sub-unit includes a sixth resistor, a seventh resistor, and a transistor. One end of the sixth resistor is connected to the base of the transistor. The emitter of the transistor is connected to a general ground. The collector of the transistor is connected in parallel with one end of the seventh resistor and then connected to the controller. The other end of the seventh resistor is connected to the instrument power supply.

[0017] Beneficial effects: The main feedback subunit can promptly feed back monitoring information to the microcontroller, and the secondary feedback subunit can transmit the received feedback information to the controller, realizing two-way communication between the electric vehicle and the microcontroller. The controller can send fault signals (such as overcurrent, overvoltage, abnormal temperature, etc.) to the microcontroller in real time, while the microcontroller can also send control commands or status query requests to the controller, forming a closed-loop monitoring system. For example, if the motor controller detects an abnormal current, it can send a fault signal to the microcontroller through the main feedback subunit. After receiving the signal, the microcontroller triggers a protection mechanism (such as cutting off the power or reducing power). The dual-channel unit (main / slave feedback) provides a redundant path. Even if one channel fails, the other channel can still transmit signals, avoiding communication interruption due to a single point of failure. The voltage divider circuit composed of the fourth and fifth resistors adjusts the amplitude of the input signal to meet the voltage range requirements of the subsequent circuit. The seventh capacitor is a filter capacitor, which, together with the fifth resistor, forms an RC low-pass filter circuit to filter out high-frequency noise (interference signals) in the input signal, making the signal output to the microcontroller purer and more stable. Under normal conditions, the controller in the main feedback subunit outputs a stable voltage. After voltage division and filtering, the signal received by the microcontroller is a logic high level. Under fault conditions, the controller outputs an abnormal voltage (such as overvoltage / undervoltage). After voltage division, the signal level changes. The microcontroller detects the level jump or specific encoding and triggers the fault handling program. When the microcontroller needs to send a command (such as start or stop) to the controller, it outputs a high level to the base of the transistor, the transistor conducts, the collector level is pulled low, the controller detects the low level signal, and executes the corresponding operation (such as starting the motor). Attached Figure Description

[0018] Figure 1 This is a circuit diagram of the wireless remote control command receiving and processing circuit for the communication circuit of the electric vehicle instrument. Figure 2 This is the circuit diagram of the main feedback subunit of the fault monitoring module for the communication circuit of the electric vehicle instrument of this utility model; Figure 3 This is the circuit diagram of the feedback subunit of the electric vehicle instrument communication circuit fault monitoring module. Detailed Implementation

[0019] Typical embodiments embodying the features and advantages of this utility model will be specifically described in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] The communication circuit for an electric vehicle instrument includes a microcontroller, a wireless radio frequency (RF) receiver and modulator module, and a fault monitoring module. The RF receiver and modulator module includes a power supply unit, a wireless chip, a wireless RF signal receiving unit, a clock unit, and an output unit. The wireless chip is connected to the power supply unit, the RF signal receiving unit, the clock unit, and the output unit, respectively. The output unit is connected to the microcontroller. The power supply unit provides a stable voltage for the wireless chip, which receives, processes, and transmits information. The RF signal receiving unit receives wireless remote control commands. The clock unit provides a unified clock reference to ensure synchronized operation of the internal circuitry of the wireless chip. The output unit transmits the mediated signal from the wireless chip to the microcontroller, which processes the signal transmitted by the output unit.

[0022] In this embodiment, the wireless chip model is LR6808R-N. The wireless chip is a 433MHz wireless receiver chip, which integrates radio frequency reception, demodulation and other modules. Specifically, the radio frequency signal input from the ANT pin of the wireless chip is sequentially amplified by low noise, mixed, amplified by intermediate frequency and filtered in the wireless chip. The demodulator then demodulates the modulated signal from the carrier into a digital signal. The demodulated digital signal is output from the DO pin (pin 5) of the wireless chip for subsequent circuit analysis and processing, so as to realize the reception of wireless signals, i.e., wireless remote control commands.

[0023] The power supply unit includes a first resistor R46, a first capacitor C12, a second capacitor C13, and a third capacitor C14. One end of the first resistor R46 is connected to the instrument power supply. One end of the first capacitor C12 and one end of the second capacitor C13 are connected in parallel to the radio frequency ground (i.e., dedicated radio frequency ground). The other ends of the first capacitor C12, the second capacitor C13, and the first resistor R46 are connected in parallel to the VDD pin of the wireless chip. One end of the third capacitor C14 is connected to the CTH pin of the wireless chip, and the other end of the third capacitor C14 is connected to the radio frequency ground.

[0024] In this embodiment, the first resistor R46 is RC0805-20Ω, the first capacitor C12 is 0603-0.1uf, the second capacitor C13 is 0603-1uF, and the third capacitor C14 is 0603-330mF.

[0025] The wireless radio frequency signal receiving unit includes an onboard antenna, a second resistor R34, a fourth capacitor C10, a first inductor L1, a fifth capacitor C15, and a second inductor L2. One end of the second resistor R34 is connected to the onboard antenna. One end of the fourth capacitor C10 and one end of the second inductor L2 are connected in parallel to the radio frequency ground. The other end of the second resistor R34, the other end of the fourth capacitor C10 and one end of the second inductor L2 are connected in parallel, and one end of the fifth capacitor C15 are connected in sequence. The other end of the fifth capacitor C15 is connected in parallel with one end of the first inductor L1 and then connected to the ANT pin of the wireless chip. The other end of the first inductor L1 is connected to the radio frequency ground.

[0026] In this embodiment, the second resistor R34 is of type 0603-0Ω, the fourth capacitor C10 is of type 0603-5.6PF, the first inductor L1 is of type 1608-39NH, the fifth capacitor C15 is of type 0603-1.5PF, and the second inductor L2 is of type 1608-27NH.

[0027] In this embodiment, an interface is reserved after the other end of the fourth capacitor C10 and the other end of the second inductor L2 are connected in parallel, which can be used to connect an external antenna.

[0028] The clock unit includes a crystal oscillator. The two crystal oscillator GND pins and the crystal oscillator OUT pin are all connected to the radio frequency ground. The crystal oscillator NC pin is connected to the REFOSC pin of the wireless chip.

[0029] In this embodiment, the crystal oscillator model is KC3225C8.0000C3GE00.

[0030] The output unit includes a sixth capacitor C11. One end of the sixth capacitor C11 is connected in parallel with the DO pin of the wireless chip and then connected to the microcontroller. The other end of the sixth capacitor C11 is connected to the radio frequency ground.

[0031] In this embodiment, the sixth capacitor C11 is model 0603-1NF.

[0032] The wireless radio frequency receiver modulation module also includes a wake-up unit, which is connected to the wireless chip and is used to wake up the microcontroller. The wake-up unit includes a third resistor R10, one end of which is connected to the SHUT pin of the wireless chip, and the other end of which is connected to the microcontroller.

[0033] In this embodiment, the third resistor R10 is of model 0603-10K.

[0034] The fault monitoring module includes a controller and a dual-channel unit. The dual-channel unit includes a main feedback subunit and a slave feedback subunit. The main feedback subunit includes a fourth resistor R20, a fifth resistor R19, and a seventh capacitor C8. One end of the fourth resistor R20 is connected in parallel with the controller and then connected to one end of the fifth resistor R19. The other end of the fourth resistor R20 is connected to the general ground. The other end of the fifth resistor R19 is connected in parallel with one end of the seventh capacitor C8 and then connected to the microcontroller. The other end of the seventh capacitor C8 is connected to the general ground. The slave feedback subunit includes a sixth resistor R48, a seventh resistor R47, and a transistor T8. One end of the sixth resistor R48 is connected to the base of the transistor, and the emitter of the transistor is connected to the general ground. The collector of the transistor T8 is connected in parallel with one end of the seventh resistor R47 and then connected to the controller. The other end of the seventh resistor R47 is connected to the instrument power supply.

[0035] In this embodiment, the fourth resistor R20 is RC0603-100K-F-1 / 10W, the fifth resistor R19 is RC0603-20K-F-1 / 10W, the seventh capacitor C8 is CL10A102M08NQNC, the sixth resistor R48 is RC0603-10K-F-1 / 16W, the seventh resistor R47 is RC0805-10K-F-1 / 16W, and the transistor T8 is MMBT5551.

[0036] In this embodiment, a third inductor L6 is connected between the radio frequency ground and the general ground. The third inductor L6 is model HCB0212KF-601T10. The third inductor L6 plays the role of filtering and isolating interference, preventing high-frequency noise from propagating through the ground wire, stabilizing the ground potential, and reducing noise interference to signal processing.

[0037] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A communication circuit for an electric vehicle's instrument panel, characterized in that: The system includes a microcontroller and a wireless radio frequency (RF) receiver and modulator module. The RF receiver and modulator module includes a power supply unit, a wireless chip, a wireless RF signal receiving unit, a clock unit, and an output unit. The wireless chip is connected to the power supply unit, the wireless RF signal receiving unit, the clock unit, and the output unit. The output unit is connected to the microcontroller. The power supply unit provides a stable voltage to the wireless chip. The wireless chip receives, processes, and transmits information. The wireless RF signal receiving unit receives wireless remote control commands. The clock unit provides a unified clock reference to ensure synchronous and coordinated operation of the internal circuitry of the wireless chip. The output unit transmits the mediated signal from the wireless chip to the microcontroller, which processes the signal transmitted by the output unit. The wireless chip model is LR6808R-N; The wireless radio frequency signal receiving unit includes an onboard antenna, a second resistor, a fourth capacitor, a first inductor, a fifth capacitor, and a second inductor. One end of the second resistor is connected to the onboard antenna. One end of the fourth capacitor and one end of the second inductor are connected in parallel and then connected to radio frequency ground. The other end of the second resistor, the other end of the fourth capacitor, the other end of the second inductor, and one end of the fifth capacitor are connected in sequence. The other end of the fifth capacitor and one end of the first inductor are connected in parallel and then connected to the ANT pin of the wireless chip. The other end of the first inductor is connected to radio frequency ground.

2. The communication circuit for the electric vehicle instrument according to claim 1, characterized in that: The power supply unit includes a first resistor, a first capacitor, a second capacitor, and a third capacitor. One end of the first resistor is connected to the instrument power supply. One end of the first capacitor and one end of the second capacitor are connected in parallel to the radio frequency ground. The other ends of the first capacitor, the second capacitor, and the first resistor are connected in parallel to the VDD pin of the wireless chip. One end of the third capacitor is connected to the CTH pin of the wireless chip, and the other end of the third capacitor is connected to the radio frequency ground.

3. The communication circuit for the electric vehicle instrument according to claim 1, characterized in that: The clock unit includes a crystal oscillator. The two crystal oscillator GND pins and the crystal oscillator OUT pin are all connected to the radio frequency ground. The crystal oscillator NC pin is connected to the REFOSC pin of the wireless chip.

4. The communication circuit for the electric vehicle instrument according to claim 1, characterized in that: The output unit includes a sixth capacitor. One end of the sixth capacitor is connected in parallel with the DO pin of the wireless chip and then connected to the microcontroller. The other end of the sixth capacitor is connected to the radio frequency ground.

5. The communication circuit for the electric vehicle instrument according to claim 1, characterized in that: The wireless radio frequency receiving and modulation module also includes a wake-up unit, which is connected to the wireless chip and is used to wake up the microcontroller. The wake-up unit includes a third resistor, one end of which is connected to the SHUT pin of the wireless chip, and the other end of which is connected to the microcontroller.

6. The communication circuit for the electric vehicle instrument according to claim 1, characterized in that: It also includes a fault monitoring module, which includes a controller and a dual-channel unit. The dual-channel unit includes a main feedback subunit and a slave feedback subunit. The main feedback subunit includes a fourth resistor, a fifth resistor, and a seventh capacitor. One end of the fourth resistor is connected in parallel with the controller and then connected to one end of the fifth resistor. The other end of the fourth resistor is connected to the general ground. The other end of the fifth resistor is connected in parallel with one end of the seventh capacitor and then connected to the microcontroller. The other end of the seventh capacitor is connected to the general ground. The slave feedback subunit includes a sixth resistor, a seventh resistor, and a transistor. One end of the sixth resistor is connected to the base of the transistor. The emitter of the transistor is connected to the general ground. The collector of the transistor is connected in parallel with one end of the seventh resistor and then connected to the controller. The other end of the seventh resistor is connected to the instrument power supply.

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