TPMS receiver supporting solar charging

Abstract

The utility model belongs to the technical field of automotive electronics, and particularly relates to a TPMS (Tire Pressure Monitor System) receiver supporting solar charging, which comprises a high-frequency receiving circuit used for receiving a wireless radio frequency signal sent by a sensor module in a tire; the single chip microcomputer is used for acquiring tire monitoring data according to the wireless radio frequency signal; the liquid crystal display circuit is used for displaying tire monitoring data; the key circuit is used for controlling liquid crystal screen backlight of the liquid crystal screen display circuit and setting the working mode of the receiver; the voltage stabilizing circuit is used for converting the photovoltaic voltage into charging voltage; the charging management circuit is electrically connected with the voltage stabilizing circuit and the single chip microcomputer; the rechargeable battery is electrically connected with the charging management circuit; and the power conversion circuit is electrically connected with the rechargeable battery, is respectively and electrically connected to the high-frequency receiving circuit, the single chip microcomputer, the liquid crystal screen display circuit and the key circuit, and is used for reducing the voltage provided by the rechargeable battery into working voltage, so that the technical scheme of the TPMS receiver charged by utilizing the solar energy is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile electronics, especially relates to a TPMS receiver supporting solar charging. BACKGROUND

[0002] Direct wireless tire pressure monitoring system (Tire Pressure Monitoring System, TPMS) is composed of two parts of sensor module in the tire and TPMS receiver. The sensor module is usually installed on the hub, is responsible for monitoring the real-time state of the tire internal pressure, temperature, when the abnormal conditions such as high pressure, low pressure or high temperature appear, timely alarm information is sent to TPMS receiver in the form of wireless signal. TPMS receiver is responsible for receiving, processing and displaying the pressure and temperature conditions in the current tire inside, it is usually installed in the vehicle interior. The existing TPMS receiver is mostly dependent on vehicle lighter or built-in battery power supply, and the following problems exist in use:

[0003] Dependence on vehicle power supply: occupy lighter interface, affect the use of other equipment;

[0004] Limited battery life: built-in battery needs to be replaced regularly, and the maintenance cost is high.

[0005] Therefore, it is necessary to provide a TPMS receiver technical scheme which does not depend on vehicle power supply and can be powered continuously. UTILITY MODEL CONTENTS

[0006] To solve the above technical problems, the utility model provides a TPMS receiver supporting solar charging.

[0007] The utility model provides a TPMS receiver supporting solar charging, which comprises:

[0008] High frequency receiving circuit is used for receiving the wireless radio frequency signal sent by the sensor module in the tire;

[0009] Single-chip microcomputer, its first signal end and the data end of high frequency receiving circuit are electrically connected, are used for obtaining tire monitoring data according to the wireless radio frequency signal;

[0010] Liquid crystal screen display circuit, its data end, control end are electrically connected with the second signal end, first control end of single-chip microcomputer respectively, are used for displaying the tire monitoring data;

[0011] Keying circuit, its control end and the second control end of single-chip microcomputer are electrically connected, are used for controlling the liquid crystal screen backlight of liquid crystal screen display circuit and setting receiver operating mode;

[0012] Stabilivolt circuit, its input end is connected with photovoltaic voltage, is used for converting the photovoltaic voltage into charging voltage;

[0013] a charging management circuit, an input end of which is electrically connected with an output end of the voltage stabilizing circuit, and a data end of which is electrically connected with a third signal end of the single-chip microcomputer;

[0014] a rechargeable battery, a positive electrode of which is electrically connected with an output end of the charging management circuit;

[0015] a power conversion circuit, an input end of which is electrically connected with the positive electrode of the rechargeable battery, and output ends of which are electrically connected with power supply ends of the high-frequency receiving circuit, the single-chip microcomputer, the liquid crystal screen display circuit and the key circuit respectively, for reducing the voltage provided by the rechargeable battery to working voltage.

[0016] In a possible implementation, a vibration detection circuit is further included, a data end of which is electrically connected with a fourth signal end of the single-chip microcomputer.

[0017] In a possible implementation, the vibration detection circuit includes a vibration sensor, a first resistor and a first capacitor.

[0018] A first conductive pin of the vibration sensor is electrically connected with a first end of the first resistor and the first capacitor respectively and serves as a data end of the vibration detection circuit, and a second conductive pin of the vibration sensor is electrically connected with a second end of the first capacitor and grounded.

[0019] A second end of the first resistor is connected with working voltage.

[0020] In a possible implementation, a low-frequency driving circuit is further included, a data end of which is electrically connected with a fifth signal end of the single-chip microcomputer, for generating a sensor trigger signal and realizing matching with the sensor module.

[0021] In a possible implementation, the low-frequency driving circuit is constructed in a half-bridge driving mode.

[0022] In a possible implementation, the low-frequency driving circuit is constructed based on a triode, a low-frequency coil, a capacitor and a resistor.

[0023] In a possible implementation, a speaker circuit is further included, an input end of which is electrically connected with a third control end of the single-chip microcomputer.

[0024] In a possible implementation, the high-frequency receiving circuit includes a high-frequency receiving antenna, a π-type matching circuit, a connection capacitor and a wireless receiving chip.

[0025] An output end of the high-frequency receiving antenna is electrically connected with an input end of the π-type matching circuit.

[0026] An output end of the π-type matching circuit is electrically connected with a first end of the connection capacitor.

[0027] The second end of the connection capacitor is electrically connected with a radio frequency signal input end of the wireless receiving chip;

[0028] A data end of the wireless receiving chip is used as a data end of the high frequency receiving circuit.

[0029] The utility model discloses still provide a kind of TPMS receiver supporting solar charging, comprising:

[0030] High frequency receiving circuit is used to receive the wireless radio frequency signal sent by sensor module inside tire;

[0031] Single-chip microcomputer, its first signal end is electrically connected with the data end of the high frequency receiving circuit, is used to obtain tire monitoring data according to the wireless radio frequency signal;

[0032] Bluetooth communication circuit, its data end is electrically connected with the second signal end of the single-chip microcomputer, is used to convert the tire monitoring data into bluetooth wireless signal;

[0033] Voltage stabilizing circuit, its input end is connected with photovoltaic voltage, is used to convert the photovoltaic voltage into charging voltage;

[0034] Charging management circuit, its input end is electrically connected with the output end of the voltage stabilizing circuit, its data end is electrically connected with the third signal end of the single-chip microcomputer;

[0035] Rechargeable battery, its anode is electrically connected with the output end of the charging management circuit;

[0036] Power conversion circuit, its input end is electrically connected with the anode of the rechargeable battery, its output end is electrically connected to the power end of the high frequency receiving circuit, the single-chip microcomputer, the bluetooth communication circuit respectively, is used to step-down voltage provided by the rechargeable battery into working voltage.

[0037] In a possible implementation manner, further include speaker circuit, its input end is electrically connected with the third control end of the single-chip microcomputer, its power end is electrically connected with the output end of the power conversion circuit.

[0038] The technical scheme provided by the utility model has at least the following beneficial effects:

[0039] By combination setting voltage stabilizing circuit, charging management circuit, rechargeable battery, power conversion circuit, power supply does not need to rely on vehicle power supply, no longer needs to take electricity from car battery or cigarette lighter, avoids destroying the integrity and complex long wiring of automobile interior wiring, also does not affect the normal use of cigarette lighter;Environmental protection and energy saving, utilize solar power supply, reduce battery replacement frequency. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 The structure block diagram of the TPMS receiver supporting solar charging provided by the embodiment of the utility model;

[0041] Figure 2 The circuit principle diagram of the vibration detection circuit provided by the embodiment of the utility model;

[0042] Figure 3 The circuit principle diagram of the low frequency drive circuit provided by the embodiment of the utility model;

[0043] Figure 4 The circuit principle diagram of the loudspeaker circuit provided by the embodiment of the utility model;

[0044] Figure 5 The circuit principle diagram of the single-chip microcomputer provided by the embodiment of the utility model;

[0045] Figure 6 The circuit principle diagram of the high frequency receiving circuit provided by the embodiment of the utility model;

[0046] Figure 7 The circuit principle diagram of the liquid crystal screen display circuit provided by the embodiment of the utility model;

[0047] Figure 8 The circuit principle diagram of the key circuit provided by the embodiment of the utility model;

[0048] Figure 9 The circuit principle diagram of the voltage stabilizing circuit provided by the embodiment of the utility model;

[0049] Figure 10 The circuit principle diagram of the charging management circuit and power conversion circuit provided by the embodiment of the utility model;

[0050] Figure 11 The structure block diagram of the second TPMS receiver supporting solar charging provided by the embodiment of the utility model;

[0051] Figure 12 The circuit principle diagram of the single-chip microcomputer and Bluetooth communication circuit provided by the embodiment of the utility model;

[0052] In the drawing, 10, high frequency receiving circuit;11, single-chip microcomputer;12, liquid crystal screen display circuit;13, key circuit;14, voltage stabilizing circuit;15, charging management circuit;16, rechargeable battery;17, power conversion circuit;18, vibration detection circuit;19, low frequency drive circuit;20, loudspeaker circuit;21, Bluetooth communication circuit. DETAILED DESCRIPTION

[0053] In order to deepen the understanding of the utility model, the utility model will be further described in detail below in combination with the drawings and examples, the examples are only used to explain the utility model, and do not constitute the limitation to the protection scope of the utility model.

[0054] Please refer to Figures 1 to 10 The utility model provides a TPMS receiver of support solar charging, comprising:

[0055] High frequency receiving circuit 10 is used for receiving the wireless radio frequency signal of sensor module in tire inside;

[0056] Singlechip 11, its first signal end and the data end electric connection of high frequency receiving circuit 10 are used for obtaining tire monitoring data according to the wireless radio frequency signal;

[0057] Liquid crystal screen display circuit 12, its data end, control end respectively with the second signal end, first control end electric connection of singlechip 11 are used for showing the tire monitoring data;

[0058] Key circuit 13, its control end and the second control end electric connection of singlechip 11 are used for controlling the liquid crystal screen backlight of liquid crystal screen display circuit 12 and setting receiver operating mode;

[0059] Voltage stabilizing circuit 14, its input end is connected with photovoltaic voltage, is used for converting the photovoltaic voltage into charging voltage;

[0060] Charging management circuit 15, its input end and the output end electric connection of voltage stabilizing circuit 14, its data end and the third signal end electric connection of singlechip 11;

[0061] Rechargeable battery 16, its anode and the output end electric connection of charging management circuit 15;

[0062] Power conversion circuit 17, its input end and the anode electric connection of rechargeable battery 16, its output end respectively electric connection to high frequency receiving circuit 10, singlechip 11, liquid crystal screen display circuit 12, key circuit 13's power end, is used for the voltage drop pressure of rechargeable battery 16 provided voltage as working voltage.

[0063] In this embodiment, the sensor module is implemented based on a conventional tire pressure monitoring sensor chip. The high-frequency receiving circuit 10 can be designed conventionally. The single-chip microcomputer 11 can be of a conventional type, such as an STM8L152C6 chip, which is a super-low-power STM8 core single-chip microcomputer based on a Harvard structure, with a maximum 16 MHz internal clock and a three-stage pipeline; supports a working voltage of 1.8 V to 3.6 V, five low-power management modes, up to 41 I / O ports available, a maximum programming FLASH capacity of 32 KB; internally provided with an LCD boost pump, which can complete the display driving of 4 x 28 segment codes. The single-chip microcomputer 11 can parse tire monitoring data from the wireless radio frequency signal. The tire monitoring data includes tire pressure and temperature detection values. The liquid crystal screen display circuit 12 can be constructed based on a conventional LCD and a triode. The liquid crystal screen display circuit 12 is used not only to display tire monitoring data, but also to display information of the TPMS receiver itself (such as the percentage of its own battery capacity, etc.). The tire monitoring data includes pressure values and temperature values of four tires. The key circuit 13 can be implemented based on a conventional key switch. The voltage stabilizing circuit 14 can be implemented based on a conventional power management chip. The charging management circuit 15 can be implemented based on a conventional charging chip. The rechargeable battery 16 can be a conventional rechargeable lithium battery. The power conversion circuit 17 can be implemented based on a conventional voltage stabilizer chip. In specific implementation, the photovoltaic voltage can be 9 V, the charging voltage can be 5 V, and the working voltage can be 3 V.

[0064] In a possible implementation, a vibration detection circuit 18 is further included, with a data end electrically connected to a fourth signal end of the single-chip microcomputer 11.

[0065] In a possible implementation, Figure 2 the vibration detection circuit 18 includes a vibration sensor S1, a first resistor R1, and a first capacitor C1.

[0066] A first conductive pin of the vibration sensor S1 is electrically connected to a first end of the first resistor R1 and the first end of the first capacitor C1 as a data end of the vibration detection circuit 18, and a second conductive pin thereof is electrically connected between a second end of the first capacitor C1 and a ground.

[0067] A second end of the first resistor R1 is connected to a working voltage.

[0068] In this embodiment, the vibration sensor S1 can be a conventional spring vibration switch, with a first conductive pin and a second conductive pin thereof in a disconnected state at rest, and in a discontinuous contact state between the first conductive pin and the second conductive pin due to elastic movement of an internal spring when vibrating. The first resistor R1 is a conventional type resistor. The first capacitor C1 is a conventional type capacitor.

[0069] In a specific embodiment, the working voltage can be 3V. When there is vibration, the vibration sensor S1 generates a pulse signal at the ZDJC end; when it is stationary, the ZDJC end is always high.

[0070] In a possible implementation, a low-frequency driving circuit 19 is further included, a data end of the low-frequency driving circuit 19 is electrically connected with a fifth signal end of the single-chip microcomputer 11, and the low-frequency driving circuit 19 is configured to generate a sensor trigger signal and realize matching with the sensor module.

[0071] It should be noted that the mainstream tire pressure monitoring sensor chip (such as SP40 of Infineon) currently supports receiving and demodulating a low-frequency signal (generally with a frequency of 125 kHz), which provides a possibility for realizing self-configuration between the tire sensor module and the TPMS receiver. In the embodiment, the low-frequency driving circuit 19 can be designed in a conventional manner, the low-frequency driving frequency of the low-frequency driving circuit 19 is 125 kHz, an amplitude shift keying (ASK) modulation mode is adopted, the low-frequency driving circuit 19 is configured to send a low-frequency trigger signal, i.e., a sensor trigger signal, to the tire sensor, i.e., the sensor module, and realize self-matching between the tire sensor ID and the TPMS receiver. By integrally arranging the low-frequency driving circuit 19, the application solves the problem of non-self-matching of the conventional TPMS receiver.

[0072] In a possible implementation, the low-frequency driving circuit 19 is constructed in a half-bridge driving mode.

[0073] In a possible implementation, as shown in FIG. 6, the low-frequency driving circuit 19 is constructed based on a transistor, a low-frequency coil, a capacitor and a resistor. Figure 3

[0074] ​In the embodiment, the low-frequency driving circuit 19 adopts a half-bridge driving mode and can be specifically composed of four triodes (Q1, Q2, Q3, Q4), a plurality of resistors (R3, R4, R5, R6, R7, R8, R9, R10), a plurality of capacitors (C3, C4, C5, C6), and a low-frequency coil LX, with a small number of components and low cost. The single-chip microcomputer 11 outputs two symmetrical square wave pulse signals LF+ and LF- with a frequency of 125 KHz. When LF+ is a positive pulse and LF- is a negative pulse, the positive pulse is filtered of low-frequency components by the coupling capacitor C3, and then passes through the current-limiting resistor R3 to the base of the power amplifier tube Q1. The negative pulse is filtered of low-frequency components by the coupling capacitor C4, and then passes through the current-limiting resistor R4 to the base of the power amplifier tube Q3. Q1 and Q2 are sequentially turned on, Q3 and Q4 are both cut off, and the low-frequency coil resonance circuit composed of LX and C6 starts to charge. When LF+ is a negative pulse and LF- is a positive pulse, the negative pulse is filtered of low-frequency components by the coupling capacitor C3, and then passes through the current-limiting resistor R3 to the base of the power amplifier tube Q1. The positive pulse is filtered of low-frequency components by the coupling capacitor C4, and then passes through the current-limiting resistor R4 to the base of the power amplifier tube Q3. Q1 and Q2 are cut off, Q3 and Q4 are sequentially turned on, and the low-frequency coil resonance circuit composed of LX and C6 starts to discharge. Thus, a 125 KHz sinusoidal current is generated in the low-frequency coil LX, and a 125 KHz low-frequency radiation electromagnetic field is generated around the low-frequency coil. In the specific implementation, a diode D1 and a diode D2 can be respectively connected between the bases and the emitters of Q1 and Q3, so as to protect the triodes Q1 and Q3. Since the A, B, and C class power amplifier tubes have low efficiency, the efficiency of the D class power amplifier tube can theoretically reach 100%, and the D class power amplifier tube works in a switching mode with small loss and easy improvement of the transmission power, so the D class power amplifier tube should be preferentially selected.

[0075] In a possible implementation, the loudspeaker circuit 20 is further included, and an input end of the loudspeaker circuit 20 is electrically connected to a third control end of the single-chip microcomputer 11.

[0076] In the embodiment, the loudspeaker circuit 20 can be implemented based on a conventional buzzer and a triode. The on and off of the triode are controlled by the single-chip microcomputer 11 outputting high and low levels, so as to control the buzzer.

[0077] In a possible implementation, Figure 4 the loudspeaker circuit 20 includes a loudspeaker H1, a first NPN triode Qn1, a second resistor R2, and a second capacitor C2.

[0078] The positive electrode of the loudspeaker H1 is electrically connected to the first end of the second capacitor C2 and connected to a working voltage, and the negative electrode is electrically connected to the collector of the first NPN triode Qn1.

[0079] The emitter of the first NPN triode Qn1 is electrically connected to the ground, and the base is electrically connected to the first end of the second resistor R2.

[0080] The second end of the second resistor R2 is connected as an input end of the speaker circuit 60.

[0081] The second end of the second capacitor C2 is electrically connected to the ground.

[0082] In the embodiment, the working voltage can be 3V. The speaker H1 is a conventional model. The first NPN transistor Qn1 is a conventional NPN transistor. The second resistor R2 is a conventional resistor. The second capacitor C2 is a conventional capacitor. In the specific implementation, the single-chip microcomputer 11 is represented by D1, which is an STM8L152C6 chip. Figure 5 Under the control of the single-chip microcomputer 11, the wireless radio frequency signals from the tire internal sensor are sent to the liquid crystal screen display circuit 12 for display after the decoding of the digital signals by the high-frequency receiving circuit 10. When the air pressure, temperature, and other abnormal conditions occur, the single-chip microcomputer 11 can generate a square wave of a certain frequency to drive the speaker H1 to issue an alarm to remind the driver.

[0083] In a possible implementation, the high-frequency receiving circuit 10 includes a high-frequency receiving antenna ANT, a π-type matching circuit, a connection capacitor C7, and a wireless receiving chip D2. Figure 6

[0084] The output end of the high-frequency receiving antenna ANT is electrically connected to the input end of the π-type matching circuit.

[0085] The output end of the π-type matching circuit is electrically connected to the first end of the connection capacitor C7.

[0086] The second end of the connection capacitor C7 is electrically connected to the radio frequency signal input end of the wireless receiving chip D2.

[0087] The data end of the wireless receiving chip D2 is connected as the data end of the high-frequency receiving circuit 10.

[0088] ​In this embodiment, the π-type matching circuit can be composed of inductance L1, capacitance C8 and C9. The model of the wireless receiving chip D2 can adopt MC33596. The STROBE, SCLK, MOSI, MISO, CONFB and RSSI pins of the wireless receiving chip D2 are jointly combined as data terminals and connected with the corresponding pins of the single-chip microcomputer 11 (STM8L152C6 chip) respectively. The MC33596 supports two signal modulation modes of ASK and FSK, the FSK receiving sensitivity can reach -108dBm at a data receiving rate of 2.4kbps, the modulation frequency range is 300MHz-915MHz, and it is internally integrated with a low-noise amplifier, a mixer, a programmable phase-locked loop, an intermediate frequency amplifier, a signal strength indication circuit and a data management module, so that only a small amount of external devices are needed to constitute the radio frequency front end of the tire pressure receiver. At any time when the control signal of the CONFB pin is low, the MC33596 enters the configuration mode, the STM8L152C6 chip is the host and the MC33596 is the slave, the STM8L152C6 chip configures the internal registers of the MC33596 through the SPI serial port, and the specific operations include radio frequency signal frequency selection, signal modulation mode setting, data transmission rate setting, signal preamble setting, field strength test module enabling and the like. When the control signal of the CONFB pin is high and the STROBE pin is also high, the MC33596 enters the receiving mode and starts to automatically complete the demodulation, encoding, storage and sending work of the received data to the STM8L152C6. The RSSIC pin is used for the control of the radio frequency signal strength sampling mode, when the level of the RSSIC pin is at the falling edge, the signal strength sampling is single-point mode, and the RSSI register will keep the signal strength of the sampling point; when the RSSIC pin keeps high, the signal strength sampling is continuous mode, and the value of the RSSI register will be constantly updated with the continuous sampling.

[0089] In the specific implementation, as Figure 7, the liquid crystal screen display circuit 12 can be composed of the LCD display screen D3, the resistor R11 and the NPN transistor Qn2. The data end (COM1, COM2, COM3, COM4, SEG1, SEG2, SEG3, SEG4, SEG5, SEG6, SEG7, SEG8, SEG9, SEG10, SEG11, SEG12, SEG13) of the LCD display screen D3 is connected to the data end of the liquid crystal screen display circuit 12. The K end of the LCD display screen D3 is connected to the collector of the NPN transistor Qn2. The base of the NPN transistor Qn2 is connected to the first control end of the single-chip microcomputer 11 through the resistor R11. The LCD display screen D3 is a segment code screen, which includes four COM signals and thirteen segment code signals. The pins 18 and 19 are backlight control signals. The data end (COM1, COM2, COM3, COM4, SEG1, SEG2, SEG3, SEG4, SEG5, SEG6, SEG7, SEG8, SEG9, SEG10, SEG11, SEG12, SEG13) of the LCD display screen D3 is connected to the corresponding pin of D1. The professional liquid crystal screen driving chip is omitted, so that the cost and the volume are reduced.

[0090] As shown in Figure 8 , the key circuit 13 can be composed of the keys (SW1, SW2), the resistors (R12, R13), the capacitors (C10, C11) and the like. One key is used for controlling the backlight of the liquid crystal screen, and one key is used for setting the working mode of the TPMS receiver.

[0091] As shown in Figure 9 , the voltage stabilizing circuit 14 can be composed of the photovoltaic plate interface XS1, the PTC thermistor R14, the Schottky diodes (V1, V2), the capacitors (C12, C13, C14, C15, C16) and the power management chip D4. In the specific implementation, the photovoltaic plate interface XS1 can be connected to the 9V flexible photovoltaic plate to access the 9V photovoltaic voltage and finally process it into 5V voltage. The power management chip D4 can adopt the model BD3571FP.

[0092] As shown in Figure 10The charging management circuit 15 can be composed of a charging chip D5, a battery interface XS2, resistors (R15, R16), and capacitors (C17, C18). The charging chip D5 can adopt GS1406, which internally adopts a PMOSFET architecture, plus a reverse charging prevention circuit, without the need for an external isolation diode, and the maximum charging current is 1A. The 6 and 7 pins (STATE1, STATE2) of GS1406 are connected to the single-chip microcomputer 11 (STM8L152C6 chip) for indicating the charging state. When STAT1=0 and STAT2=1, it indicates that the charging is in progress; when STAT1=1 and STAT2=0, it indicates that the charging has been completed. C17 and C18 are filter capacitors. The external input charging voltage of the charging management circuit 15 is +5V, which is generated by the 9V flexible photovoltaic panel through the voltage stabilizing circuit 14. The battery interface XS2 is used to access the rechargeable battery 16, and the positive voltage of the rechargeable battery 16 is BATT (such as 5V). The power conversion circuit 17 can be composed of a voltage stabilizing chip D6, Schottky diodes (V3, V4), and capacitors (C19, C20, C21, C22, C23, C24), and the final output working voltage can be 3V.

[0093] As Figure 11 The utility model also provides a support solar charging's TPMS receiver, include:

[0094] High frequency receiving circuit 10 is used for receiving the wireless radio frequency signal that sensor module in tire interior sent out;

[0095] Single-chip microcomputer 11, its first signal end with high frequency receiving circuit 10's data terminal electric connection, is used for according to wireless radio frequency signal obtains tire monitoring data;

[0096] Bluetooth communication circuit 21, its data terminal with single-chip microcomputer 11's second signal end electric connection, is used for converting tire monitoring data into bluetooth wireless signal;

[0097] Voltage stabilizing circuit 14, its input end accesses photovoltaic voltage, is used for converting photovoltaic voltage into charging voltage;

[0098] Charging management circuit 15, its input end with voltage stabilizing circuit 14's output electric connection, its data terminal with single-chip microcomputer 11's third signal end electric connection;

[0099] Rechargeable battery 16, its positive pole with charging management circuit 15's output electric connection;

[0100] A power conversion circuit 17, an input end of which is electrically connected to the positive pole of the rechargeable battery 16, and an output end of which is electrically connected to the power supply end of the high-frequency receiving circuit 10, the single-chip microcomputer 11 and the Bluetooth communication circuit 21 respectively, for reducing the voltage provided by the rechargeable battery 16 to working voltage.

[0101] In the embodiment, the Bluetooth communication circuit 21 can adopt a conventional Bluetooth communication module, such as an HC-05 Bluetooth module. Based on Bluetooth communication technology, the liquid crystal display screen of a conventional TPMS receiver can be replaced by the Bluetooth pairing function of a smart phone and a mobile phone APP, so as to reduce the volume of the TPMS receiver. The single-chip microcomputer 11 can send the current tire pressure and temperature detection values to the mobile phone APP for display, and receive the control commands (such as switching between configuration mode and working mode) issued by the mobile phone APP. The present application solves the problem of large volume of conventional TPMS receivers by integrating the Bluetooth communication circuit 21.

[0102] In a specific implementation manner, Figure 12 The single-chip microcomputer 11 adopts an STM8L152C6 chip, denoted as D1. The Bluetooth communication circuit 21 adopts an HC-05 module, denoted as D7. D1 sends the current detection data (tire pressure and temperature detection values) to the user's mobile phone APP for display through D7, and receives the control commands (such as switching between configuration mode and working mode) issued by the mobile phone APP. The HC-O5 module is a simple wireless communication device based on Bluetooth 2.0 protocol, which has 6 pins in total. The VCC and GND pins are used for power supply. The RXD pin is connected to the transmitting pin 3 of the USART serial port of the single-chip microcomputer 11 to receive the detection data sent by the single-chip microcomputer 11. The TXD pin is connected to the receiving pin 4 of the USART serial port of the single-chip microcomputer 11 to send the control commands from the mobile phone APP to the single-chip microcomputer 11. The EN is an enabling pin, which is disabled when set to low level. The STATE pin outputs high and low levels to indicate the state of the HC-O5 module, which outputs high level when connected and outputs low level when disconnected.

[0103] In a possible implementation manner, the TPMS receiver further includes a vibration detection circuit 18, which is electrically connected to the single-chip microcomputer 11.

[0104] In a possible implementation manner, the TPMS receiver further includes a low-frequency driving circuit 19, which is electrically connected to the single-chip microcomputer 11, for generating a sensor triggering signal to realize matching with the sensor module.

[0105] In a possible implementation manner, the TPMS receiver further includes a speaker circuit 20, an input end of which is electrically connected to the third control end of the single-chip microcomputer 11, and a power supply end of which is electrically connected to the output end of the power conversion circuit 17.

[0106] The above embodiments should not be in any way limit the utility model, all technical solutions obtained by equivalent replacement or equivalent conversion fall within the protection scope of the utility model.

Claims

1. A TPMS receiver supporting solar charging, characterized in that, include: A high-frequency receiving circuit is used to receive wireless radio frequency signals emitted by the sensor module inside the tire. The microcontroller has its first signal terminal electrically connected to the data terminal of the high-frequency receiving circuit, and is used to acquire tire monitoring data based on the wireless radio frequency signal; The LCD display circuit has its data terminal and control terminal electrically connected to the second signal terminal and the first control terminal of the microcontroller, respectively, for displaying the tire monitoring data; The button circuit, whose control terminal is electrically connected to the second control terminal of the microcontroller, is used to control the backlight of the LCD screen and set the receiver working mode of the LCD screen display circuit. A voltage regulator circuit, whose input terminal is connected to the photovoltaic voltage, is used to convert the photovoltaic voltage into a charging voltage; The charging management circuit has its input terminal electrically connected to the output terminal of the voltage regulator circuit, and its data terminal electrically connected to the third signal terminal of the microcontroller. A rechargeable battery, the positive terminal of which is electrically connected to the output terminal of the charging management circuit; The power conversion circuit has its input terminal electrically connected to the positive terminal of the rechargeable battery, and its output terminal electrically connected to the power supply terminals of the high-frequency receiving circuit, the microcontroller, the LCD display circuit, and the button circuit, respectively, for stepping down the voltage provided by the rechargeable battery to the operating voltage.

2. The TPMS receiver according to claim 1, characterized in that, It also includes a vibration detection circuit, whose data terminal is electrically connected to the fourth signal terminal of the microcontroller.

3. The TPMS receiver according to claim 2, characterized in that, The vibration detection circuit includes a vibration sensor, a first resistor, and a first capacitor; The first conductive pin of the vibration sensor is electrically connected to the first end of the first resistor and the first end of the first capacitor, and serves as the data terminal of the vibration detection circuit. Its second conductive pin is electrically connected to the second end of the first capacitor and grounded. The second terminal of the first resistor is connected to the operating voltage.

4. The TPMS receiver according to claim 1, characterized in that, It also includes a low-frequency drive circuit, whose data terminal is electrically connected to the fifth signal terminal of the microcontroller, used to generate a sensor trigger signal to achieve matching with the sensor module.

5. The TPMS receiver according to claim 4, characterized in that, The low-frequency drive circuit is constructed using a half-bridge drive method.

6. The TPMS receiver according to claim 5, characterized in that, The low-frequency drive circuit is constructed based on transistors, low-frequency coils, capacitors, and resistors.

7. The TPMS receiver according to claim 1, characterized in that, It also includes a speaker circuit, whose input terminal is electrically connected to the third control terminal of the microcontroller.

8. The TPMS receiver according to claim 1, characterized in that, The high-frequency receiving circuit includes a high-frequency receiving antenna, a π-type matching circuit, a connecting capacitor, and a wireless receiving chip. The output terminal of the high-frequency receiving antenna is electrically connected to the input terminal of the π-type matching circuit; The output terminal of the π-type matching circuit is electrically connected to the first terminal of the connecting capacitor; The second end of the connecting capacitor is electrically connected to the radio frequency signal input terminal of the wireless receiver chip; The data terminal of the wireless receiver chip serves as the data terminal of the high-frequency receiver circuit.

9. A TPMS receiver supporting solar charging, characterized in that, include: A high-frequency receiving circuit is used to receive wireless radio frequency signals emitted by the sensor module inside the tire. The microcontroller has its first signal terminal electrically connected to the data terminal of the high-frequency receiving circuit, and is used to acquire tire monitoring data based on the wireless radio frequency signal; The Bluetooth communication circuit has its data terminal electrically connected to the second signal terminal of the microcontroller, and is used to convert the tire monitoring data into Bluetooth wireless signals. A voltage regulator circuit, whose input terminal is connected to the photovoltaic voltage, is used to convert the photovoltaic voltage into a charging voltage; The charging management circuit has its input terminal electrically connected to the output terminal of the voltage regulator circuit, and its data terminal electrically connected to the third signal terminal of the microcontroller. A rechargeable battery, the positive terminal of which is electrically connected to the output terminal of the charging management circuit; The power conversion circuit has its input terminal electrically connected to the positive terminal of the rechargeable battery, and its output terminal electrically connected to the power supply terminals of the high-frequency receiving circuit, the microcontroller, and the Bluetooth communication circuit, respectively, for stepping down the voltage provided by the rechargeable battery to the operating voltage.

10. The TPMS receiver according to claim 9, characterized in that, It also includes a speaker circuit, whose input terminal is electrically connected to the third control terminal of the microcontroller, and whose power supply terminal is electrically connected to the output terminal of the power conversion circuit.

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