TPMS receiver circuit with double controllers

Abstract

The utility model relates to the field of tire pressure sensors, in particular to a TPMS (Tire Pressure Monitor System) receiver circuit with double controllers, which comprises a power supply module, a receiving module, an auxiliary controller module, a main controller module and a CAN (Controller Area Network) communication module, the power supply module is electrically connected with an external power supply, and the power output end of the power supply module is electrically connected with the power input ends of the receiving module, the auxiliary controller module, the main controller module and the CAN communication module; the signal input end of the receiving module is connected with an antenna ANT, and the signal output end of the receiving module is electrically connected with the signal input end of the auxiliary controller module; the signal output end of the auxiliary controller module is electrically connected with the main controller module, the communication end of the main controller module is electrically connected with the CAN communication module, the auxiliary controller only receives and stores data by means of division and cooperation of the two controllers, the main controller is only responsible for data reading and communication, mutual interference is avoided, and the CAN communication module is electrically connected with the CAN communication module. And the phenomena of RF data frame missing, data loss, CAN communication abnormity and the like are effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of tire pressure sensors, specifically to a dual-controller TPMS receiver circuit. Background Technology

[0002] A sensor is a detection device that acts as an extension of our sensory system. It can detect various physical, chemical, or biological quantities in the surrounding environment and convert these non-electrical quantities into electrical signals or other easily processed and transmitted signal forms according to certain rules, for subsequent measurement, control, display, or recording operations. The tire pressure receiving circuit of a tire pressure sensor is a key component of a tire pressure monitoring system (TPMS). Its main function is to receive wireless signals emitted by the tire pressure sensor and process the signals through demodulation and decoding to obtain information such as tire pressure and temperature.

[0003] According to regulations, tractor-trailers with a maximum speed of 90 km / h or higher must have a tire pressure monitoring system (TPMS) or a device with tire pressure monitoring function installed on wheels with single tires. Please refer to the appendix. Figure 1 In commercial vehicles equipped with tire pressure sensors throughout, the large number of sensors results in a large number of RF data packets. Furthermore, conventional receiving circuits use a single controller to receive tire pressure information while also handling communication with the instrument panel. This can easily lead to issues such as missing RF data from a particular tire location or communication failures with the instrument panel, resulting in delayed data processing. Utility Model Content

[0004] The purpose of this invention is to provide a dual-controller TPMS receiver circuit, which aims to improve the conventional receiver circuit that uses a single controller to receive tire pressure information and also handles communication with the dashboard, resulting in problems such as missing RF data for a certain tire position or abnormal communication with the dashboard, leading to untimely data processing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A dual-controller TPMS receiver circuit includes a power supply module, a receiving module, an auxiliary controller module, a main controller module, and a CAN communication module;

[0007] The power supply module is electrically connected to an external power source. Its power output terminal is electrically connected to the power input terminals of the receiving module, auxiliary controller module, main controller module, and CAN communication module. The receiving module has an antenna (ANT) connected to its signal input terminal. Its signal output terminal is electrically connected to the signal input terminal of the auxiliary controller module, which stores the tire pressure signal. The auxiliary controller module's signal output terminal is electrically connected to the main controller module. The main controller module's communication terminal is electrically connected to the CAN communication module, which is electrically connected to an external instrument panel. The main controller module reads the tire pressure information from the auxiliary controller module and communicates with the external instrument panel via the CAN communication module.

[0008] Furthermore, the auxiliary controller module includes a control chip U6, resistors R3, R4, R41, R42, and capacitors C21, C22, and C23.

[0009] The power supply module outputs a +3.3V voltage to one end of resistor R41, one end of resistor R42, one end of resistor R3, one end of capacitor C23, one end of capacitor C22, and pin 6 of control chip U6; the other ends of resistor R42 and resistor R41 are electrically connected to pins 1 and 2 of control chip U6, respectively, and the other end of resistor R3 is electrically connected to one end of capacitor C21 and pin 15 of control chip U6.

[0010] Pin 12 of the control chip U6 is electrically connected to one end of resistor R4; pins 1, 2, 16, 17, 18, 19, and 20 of the control chip U6 are all electrically connected to the signal output terminal of the receiving module; pins 10 and 11 of the control chip U6 are electrically connected to the main control module.

[0011] The other ends of resistor R4, capacitor C21, capacitor C22, capacitor C23, and pin 4 of control chip U6 are all grounded.

[0012] Furthermore, the power supply module includes voltage regulator chip U1, voltage regulator chip U5, varistor D3, diode D1, diode D2A, diode D2B, polarized capacitor C4, polarized capacitor C6, polarized capacitor C12, capacitor C1, capacitor C2, capacitor C3, capacitor C5, capacitor C8, capacitor C10, and resistors R1 and R2.

[0013] The positive terminal of the external backup power supply is electrically connected to one end of the varistor D3, one end of the resistor R1, the positive terminal of the diode D1, and one end of the capacitor C1. The other end of the capacitor C1 is electrically connected to one end of the capacitor C2.

[0014] The negative terminal of diode D1 is electrically connected to the positive terminal of polarized capacitor C4, one end of capacitor C10, and pin 2 of voltage regulator chip U1, and is also electrically connected to an external +12V voltage. Pin 3 of voltage regulator chip U1 is electrically connected to the positive terminal of polarized capacitor C6, one end of capacitor C5, and pins 1 and 3 of voltage regulator chip U5, and outputs +5V voltage to the CAN communication module. Pin 5 of voltage regulator chip U5 is electrically connected to one end of capacitor C8 and the positive terminal of polarized capacitor C12. The other end of resistor R1 is electrically connected to one end of resistor R2, one end of capacitor C3, the positive terminal of diode D2B, and the negative terminal of diode D2A. The positive terminal of diode D2A and pin 5 of voltage regulator chip U5 both output +3.3V voltage to the receiving module, auxiliary controller module, main controller module, and CAN communication module.

[0015] The other end of the varistor D3, the other end of the capacitor C2, the negative terminal of the polarized capacitor C4, the other end of the capacitor C10, the negative terminal of the polarized capacitor C6, the other end of the capacitor C5, the other end of the capacitor C8, the negative terminal of the polarized capacitor C12, the other end of the capacitor C3, the other end of the resistor R2, the negative terminal of the diode D2B, and pin 1 of the voltage regulator chip U1 and pin 2 of the voltage regulator chip U5 are all grounded.

[0016] Furthermore, the receiving module includes an RF receiving chip U4, a crystal oscillator XT2, inductors L1, L2, L3, and L4, and capacitors C7, C11, C13, C14, C15, C16, C17, C18, and C19.

[0017] The power supply module outputs a +3.3V voltage to one end of capacitor C7, one end of capacitor C11, and pins 4 and 7 of the RF receiver chip U4; the antenna ANT is electrically connected to one end of capacitor C18 and one end of capacitor C19, and the other end of capacitor C19 is electrically connected to one end of capacitor C15, one end of inductor L2, one end of inductor L3, and one end of capacitor C16.

[0018] The other end of inductor L2 is electrically connected to one end of capacitor C17, one end of inductor L1, and pin 2 of RF receiver chip U4; the other end of capacitor C16 is electrically connected to one end of inductor L4, the other end of inductor L1, and pin 1 of RF receiver chip U4; pin 13 of RF receiver chip U4 is electrically connected to one end of crystal oscillator XT2 and one end of capacitor C14; pin 14 of RF receiver chip U4 is electrically connected to the other end of crystal oscillator XT2 and one end of capacitor C13; pins 8, 9, 10, 11, 12, 15, and 16 of RF receiver chip U4 are all electrically connected to the signal input terminal of the auxiliary controller module.

[0019] The other ends of capacitor C18, capacitor C15, inductor L3, capacitor C17, inductor L4, capacitor C7, capacitor C11, capacitor C13, capacitor C14, and pins 5, 6, and 17 of the RF receiver chip are all grounded.

[0020] Furthermore, the main controller module includes a control chip U2, a resistor R39, a capacitor C41, a capacitor C44, a clock unit, and an IGN unit;

[0021] The power supply module outputs a +3.3V voltage to one end of resistor R39, one end of capacitor C44, and pins 12 and 35 of control chip U2; an external +12V voltage is input to pin 37 of control chip U2.

[0022] The other end of resistor R39 is electrically connected to one end of capacitor C34 and pin 4 of control chip U2; pin 10 of control chip U2 is electrically connected to one end of capacitor C41; the clock unit is electrically connected between pins 8 and 9 of control chip U2; the signal input terminal of the IGN module is connected to the external vehicle ignition switch, and the signal output terminal of the IGN module is electrically connected to pin 29 of control chip U2.

[0023] Pins 42 and 43 of the control chip U2 are electrically connected to the auxiliary controller module, and pins 31, 33 and 34 of the control chip U2 are electrically connected to the CAN communication module.

[0024] The other end of capacitor C34, the other end of capacitor C41, the other end of capacitor C44, and pins 11 and 36 of control chip U2 are all grounded.

[0025] Furthermore, the clock module includes a crystal oscillator XT1, a resistor R40, and capacitors C35 and C36;

[0026] Pin 8 of the control chip U2 is electrically connected to one end of resistor R40, one end of crystal oscillator XT1, and one end of capacitor C35. Pin 9 of the control chip U2 is electrically connected to the other end of resistor R40, the other end of crystal oscillator XT1, and one end of capacitor C36. The other ends of capacitors C35 and C36 are both grounded.

[0027] Furthermore, the IGN unit includes diode D5A, diode D5B, capacitor C9, capacitor C20, and resistors R10, R11, R12, and R14.

[0028] The power module outputs a +3.3V voltage to the positive terminal of diode D5A; one end of resistor R11 is electrically connected to the positive terminal of the external backup power supply, and the other end of resistor R11 is electrically connected to one end of capacitor C9, one end of resistor R10, and one end of resistor R14, and serves as an input terminal connected to the external vehicle ignition switch; the other end of resistor R14 is electrically connected to one end of resistor R12, one end of capacitor C20, the negative terminal of diode D5A, and the positive terminal of diode D5B, and serves as an output terminal connected to pin 29 of control chip U2.

[0029] The other end of capacitor C9, the other end of resistor R10, the other end of resistor R12, the other end of capacitor C20, and the negative terminal of diode D5B are all grounded.

[0030] Furthermore, the CAN communication module includes a transceiver chip U3, diodes ZD2A, ZD2B, ZD3A, ZD3B, capacitors C47, C46, ​​C45, C49, C50, and resistor R43.

[0031] The power supply module outputs +3.3V voltage to one end of capacitor C47 and pin 5 of transceiver chip U3, and outputs +5V voltage to pin 3 of transceiver chip U3; pins 1, 4, and 8 of transceiver chip U3 are all electrically connected to the main controller module.

[0032] Pin 6 of the transceiver chip U3 is electrically connected to the negative terminal of diode ZD3A, one end of capacitor C49, and one end of resistor R43, and is connected to the CAN-L interface for communication with an external instrument panel; the positive terminal of diode ZD3A is electrically connected to the positive terminal of diode ZD3B, and the other end of capacitor C49 is electrically connected to one end of capacitor C50.

[0033] Pin 7 of the transceiver chip U3 is electrically connected to the negative terminal of diode ZD2A, one end of capacitor C45, and the other end of resistor R43, and is connected to the CAN-H interface for communication with an external instrument panel; the positive terminal of diode ZD2A is electrically connected to the positive terminal of diode ZD2B, and the other end of capacitor C45 is electrically connected to one end of capacitor C46.

[0034] The other ends of capacitor C47, capacitor C46, ​​capacitor C50, the negative terminal of diode ZD2B, the negative terminal of diode ZD3B, and pin 2 of transceiver chip U3 are all grounded.

[0035] Furthermore, diodes ZD2A, ZD2B, ZD3A, and ZD3B are all Schottky diodes.

[0036] Furthermore, the model number of the control chip U6 is PY20F003F18U7.

[0037] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0038] The auxiliary controller module is dedicated to receiving tire pressure data signals from various sensors and storing them in the corresponding wheel space of the memory. The main controller module periodically reads the data in the auxiliary controller module's memory and transmits it to the dashboard in real time via the CAN bus of the CAN communication module to display the wheel status in real time. By utilizing the division of labor and cooperation between the two controllers, the auxiliary controller is only responsible for data reception and storage, while the main controller is only responsible for data reading and communication. They do not interfere with each other and effectively prevent phenomena such as RF data frame loss, data loss, and CAN communication abnormalities. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the prior art for the dual-controller TPMS receiver circuit described in this utility model;

[0040] Figure 2 This is a circuit diagram of the power supply module for the dual-controller TPMS receiver circuit described in this utility model;

[0041] Figure 3 This is a circuit diagram of the receiving module of the dual-controller TPMS receiver circuit described in this utility model;

[0042] Figure 4 This is a circuit diagram of the auxiliary controller module of the dual-controller TPMS receiver circuit described in this utility model;

[0043] Figure 5 This is a circuit diagram of the main controller module of the dual-controller TPMS receiver circuit described in this utility model;

[0044] Figure 6 This is a circuit diagram of the CAN communication module of the dual-controller TPMS receiver circuit described in this utility model;

[0045] Figure 7 This is a circuit diagram of the IGN detection module of the dual-controller TPMS receiver circuit described in this utility model;

[0046] Figure 8 This is a block diagram of the dual-controller TPMS receiver circuit of this utility model. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0048] Additionally, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are all based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element of this utility model must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] When an element is referred to as being "fixed to," "set on," or "contained on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to," it can be directly connected to or indirectly connected to that other element.

[0050] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] Example

[0052] Please refer to Figure 2-8 As shown, this embodiment provides a dual-controller TPMS receiver circuit, including a power supply module, a receiving module, an auxiliary controller module, a main controller module, and a CAN communication module.

[0053] Please refer to Figure 8 As shown, the power supply module is electrically connected to an external power source. The power output terminal of the power supply module is electrically connected to the power input terminals of the receiving module, auxiliary controller module, main controller module, and CAN communication module. The signal input terminal of the receiving module is connected to an antenna (ANT). The signal output terminal of the receiving module is electrically connected to the signal input terminal of the auxiliary controller module, which stores the tire pressure signal. The signal output terminal of the auxiliary controller module is electrically connected to the main controller module. The communication terminal of the main controller module is electrically connected to the CAN communication module, which is electrically connected to the external instrument panel. The main controller module reads the tire pressure information from the auxiliary controller module and communicates with the external instrument panel via the CAN communication module.

[0054] The auxiliary controller module is dedicated to receiving tire pressure data signals from various sensors and storing them in the corresponding wheel space of the memory. The main controller module periodically reads the data in the auxiliary controller module's memory and transmits it to the dashboard in real time via the CAN bus of the CAN communication module to display the wheel status in real time. By utilizing the division of labor and cooperation between the two controllers, the auxiliary controller is only responsible for data reception and storage, while the main controller is only responsible for data reading and communication. They do not interfere with each other and effectively prevent phenomena such as RF data frame loss, data loss, and CAN communication abnormalities.

[0055] Please refer to Figure 2 As shown, the power supply module includes voltage regulator chip U1, voltage regulator chip U5, varistor D3, diode D1, diode D2A, diode D2B, polarized capacitor C4, polarized capacitor C6, polarized capacitor C12, capacitor C1, capacitor C2, capacitor C3, capacitor C5, capacitor C8, capacitor C10, and resistors R1 and R2.

[0056] The positive terminal of the external backup power supply is electrically connected to one end of the varistor D3, one end of the resistor R1, the positive terminal of the diode D1, and one end of the capacitor C1. The other end of the capacitor C1 is electrically connected to one end of the capacitor C2.

[0057] The negative terminal of diode D1 is electrically connected to the positive terminal of polarized capacitor C4, one end of capacitor C10, and pin 2 of voltage regulator chip U1, and is also electrically connected to an external +12V voltage. Pin 3 of voltage regulator chip U1 is electrically connected to the positive terminal of polarized capacitor C6, one end of capacitor C5, and pins 1 and 3 of voltage regulator chip U5, and outputs +5V voltage to the CAN communication module. Pin 5 of voltage regulator chip U5 is electrically connected to one end of capacitor C8 and the positive terminal of polarized capacitor C12; the other end of resistor R1 is electrically connected to one end of resistor R2, one end of capacitor C3, the positive terminal of diode D2B, and the negative terminal of diode D2A. The positive terminal of diode D2A and pin 5 of voltage regulator chip U5 both output +3.3V voltage to the receiving module, auxiliary controller module, main controller module, and CAN communication module. In this embodiment, voltage regulator chip U1 is model SG2601A50G; voltage regulator chip U5 is model SG2030B33M.

[0058] The other end of varistor D3, the other end of capacitor C2, the negative terminal of polarized capacitor C4, the other end of capacitor C10, the negative terminal of polarized capacitor C6, the other end of capacitor C5, the other end of capacitor C8, the negative terminal of polarized capacitor C12, the other end of capacitor C3, the other end of resistor R2, the negative terminal of diode D2B, and pin 1 of voltage regulator chip U1 and pin 2 of voltage regulator chip U5 are all grounded.

[0059] The power supply module forms a multi-stage voltage regulation structure based on voltage regulator chips U1 and U5, and connects to an external backup power supply via a BAT interface. In the event of a +12V main power supply failure, stable power supply is achieved through the backup power supply. Polarized capacitors C4, C10, C6, C5, C12, and C8 form an input filter capacitor network to filter out high-frequency noise and voltage fluctuations. Diode D2A serves as input reverse connection protection to prevent damage to the overall circuit in case of reverse power connection.

[0060] Please refer to Figure 3 As shown, the receiving module includes an RF receiver chip U4, a crystal oscillator XT2, inductors L1, L2, L3, and L4, and capacitors C7, C11, C13, C14, C15, C16, C17, C18, and C19.

[0061] The power supply module outputs +3.3V to one end of capacitor C7, one end of capacitor C11, and pins 4 and 7 of the RF receiver chip U4; that is, the positive terminal of diode D2A and pin 5 of voltage regulator chip U5 are electrically connected to one end of capacitor C7, one end of capacitor C11, and pins 4 and 7 of RF receiver chip U4. The antenna ANT is electrically connected to one end of capacitor C18 and one end of capacitor C19. The other end of capacitor C19 is electrically connected to one end of capacitor C15, one end of inductor L2, one end of inductor L3, and one end of capacitor C16.

[0062] The other end of inductor L2 is electrically connected to one end of capacitor C17, one end of inductor L1, and pin 2 of RF receiver chip U4. The other end of capacitor C16 is electrically connected to one end of inductor L4, the other end of inductor L1, and pin 1 of RF receiver chip U4. Pin 13 of RF receiver chip U4 is electrically connected to one end of crystal oscillator XT2 and one end of capacitor C14, and pin 14 of RF receiver chip U4 is electrically connected to the other end of crystal oscillator XT2 and one end of capacitor C13. Pins 8, 9, 10, 11, 12, 15, and 16 of RF receiver chip U4 are all electrically connected to the signal input terminals of the auxiliary controller module. In this embodiment, the model of RF receiver chip U4 is CMT2219B.

[0063] The other ends of capacitor C18, capacitor C15, inductor L3, capacitor C17, inductor L4, capacitor C7, capacitor C11, capacitor C13, capacitor C14, and pins 5, 6, and 17 of the RF receiver chip are all grounded.

[0064] Capacitors C15, C16, and C17, along with inductors L1 and L4, form a filter circuit that ensures only specific frequency radio frequency (RF) signals are allowed to pass through, filtering out unwanted frequencies and effectively reducing the impact of interference signals on signal transmission. Crystal oscillator XT2, connected to capacitors C13 and C14, provides a stable clock signal to the RF receiver chip U4. This provides a time reference for the RF receiver chip U4's RF signal modulation and demodulation operations, ensuring that the RF receiver chip U4 can accurately process RF signals.

[0065] Please refer to the appendix. Figure 4 The auxiliary controller module includes a control chip U6, resistors R3, R4, R41, R42, and capacitors C21, C22, and C23.

[0066] The power supply module outputs +3.3V to one end of resistor R41, one end of resistor R42, one end of resistor R3, one end of capacitor C23, one end of capacitor C22, and pin 6 of control chip U6. Specifically, the positive terminal of diode D2A and pin 5 of voltage regulator chip U5 are electrically connected to one end of resistors R41, R42, R3, C23, C22, and pin 6 of control chip U6. The other ends of resistors R42 and R41 are electrically connected to pins 1 and 2 of control chip U6, respectively. The other end of resistor R3 is electrically connected to one end of capacitor C21 and pin 15 of control chip U6.

[0067] Pin 12 of control chip U6 is electrically connected to one end of resistor R4. Pins 1, 2, 16, 17, 18, 19, and 20 of control chip U6 are all electrically connected to the signal output terminals of the receiving module; specifically, pin 8 of RF receiving chip U4 is electrically connected to pin 18 of control chip U6, pin 9 of RF receiving chip U4 is electrically connected to pin 2 of control chip U6, pin 10 of RF receiving chip U4 is electrically connected to pin 1 of control chip U6, pin 11 of RF receiving chip U4 is electrically connected to pin 20 of control chip U6, pin 12 of RF receiving chip U4 is electrically connected to pin 19 of control chip U6, pin 15 of RF receiving chip U4 is electrically connected to pin 17 of control chip U6, and pin 16 of RF receiving chip U4 is electrically connected to pin 16 of control chip U6. Pins 10 and 11 of control chip U6 are electrically connected to the main control module. In this embodiment, the control chip U6 is model PY20F003F18U7.

[0068] The other ends of resistor R4, capacitor C21, capacitor C22, capacitor C23, and pin 4 of control chip U6 are all grounded.

[0069] Pin 1 of the control chip U6 is used to receive serial data; pin 2 is used to receive the SPI clock signal; pins 16 and 17 are used for trigger signal acquisition; the tire pressure signal is input to the control chip U6 through pins 1, 2, and 16-20. After preprocessing the signal, the control chip U6 stores it in its internal Flash memory. The reset pin of the control chip U6 is pulled up to 3.3V through resistor R3 and connected in parallel with capacitor C21 to ground to achieve hardware reset filtering, filter out high-frequency interference, and ensure stable power-on reset. The power supply pin is bypassed by capacitors C23 and C22 to effectively suppress voltage fluctuations and improve signal integrity.

[0070] Please refer to the appendix. Figure 5 The main controller module includes a control chip U2, resistor R39, capacitor C41, capacitor C44, clock unit, and IGN unit.

[0071] The power supply module outputs a +3.3V voltage to one end of resistor R39, one end of capacitor C44, and pins 12 and 35 of control chip U2; an external +12V voltage is input to pin 37 of control chip U2, which is the positive terminal of diode D2A, and pin 5 of voltage regulator chip U5 is electrically connected to one end of resistor R39, one end of capacitor C44, and pins 12 and 35 of control chip U2.

[0072] The other end of resistor R39 is electrically connected to one end of capacitor C34 and pin 4 of control chip U2; pin 10 of control chip U2 is electrically connected to one end of capacitor C41. The clock unit is electrically connected between pins 8 and 9 of control chip U2; the signal input terminal of the IGN module is connected to the external vehicle ignition switch, and the signal output terminal of the IGN module is electrically connected to pin 29 of control chip U2. Pins 42 and 43 of control chip U2 are both electrically connected to the auxiliary controller module. In this embodiment, pin 42 of control chip U2 is electrically connected to pin 11 of control chip U6, and pin 43 of control chip U2 is electrically connected to pin 10 of control chip U6; pins 31, 33, and 34 of control chip U2 are all electrically connected to the CAN communication module. In this embodiment, the model of control chip U2 is UPD78F1829.

[0073] The other end of capacitor C34, the other end of capacitor C41, the other end of capacitor C44, and pins 11 and 36 of control chip U2 are all grounded.

[0074] Furthermore, the clock module includes a crystal oscillator XT1, a resistor R40, and capacitors C35 and C36.

[0075] Pin 8 of the control chip U2 is electrically connected to one end of resistor R40, one end of crystal oscillator XT1, and one end of capacitor C35. Pin 9 of the control chip U2 is electrically connected to the other end of resistor R40, the other end of crystal oscillator XT1, and one end of capacitor C36. The other ends of capacitors C35 and C36 are both grounded.

[0076] The crystal oscillator XT1, resistor R40, capacitors C35 and C36, together with the internal inverter of the control chip U2, form a Pierce oscillator, which provides a stable clock for the control chip U2, while achieving a small size, reducing the overall structure size, and simplifying the overall circuit structure, effectively reducing the cost of use.

[0077] Please refer to the appendix. Figure 7 The IGN unit includes diodes D5A and D5B, capacitors C9 and C20, and resistors R10, R11, R12, and R14.

[0078] The power module outputs +3.3V to the anode of diode D5A; that is, the anode of diode D2A and pin 5 of voltage regulator chip U5 are electrically connected to the anode of diode D5A. One end of resistor R11 is electrically connected to the positive terminal of the external backup power supply, and the other end of resistor R11 is electrically connected to one end of capacitor C9, one end of resistor R10, and one end of resistor R14, serving as an input terminal connected to the external vehicle ignition switch. The other end of resistor R14 is electrically connected to one end of resistor R12, one end of capacitor C20, the cathode of diode D5A, and the anode of diode D5B, serving as an output terminal connected to pin 29 of control chip U2.

[0079] The other ends of capacitor C9, resistor R10, resistor R12, capacitor C20, and diode D5B are all grounded. When the IGN unit does not receive an ignition signal, it controls the main controller module to enter sleep mode. After the IGN unit receives an ignition signal, it controls the main controller module to enter working mode, reducing standby power consumption.

[0080] Please refer to the appendix. Figure 6 The CAN communication module includes transceiver chip U3, diodes ZD2A, ZD2B, ZD3A, and ZD3B, capacitors C47, C46, ​​C45, C49, and C50, and resistor R43.

[0081] The power supply module outputs +3.3V to one end of capacitor C47 and pin 5 of transceiver chip U3 (i.e., the positive terminal of diode D2A). Pin 5 of voltage regulator chip U5 is electrically connected to one end of capacitor C47 and pin 5 of transceiver chip U3. The power supply module outputs +5V to pin 3 of transceiver chip U3; that is, pin 3 of voltage regulator chip U1 is electrically connected to pin 3 of transceiver chip U3. Pins 1, 4, and 8 of transceiver chip U3 are all electrically connected to the main controller module. Specifically, pin 1 of transceiver chip U3 is electrically connected to pin 34 of control chip U2, pin 4 of transceiver chip U3 is electrically connected to pin 33 of control chip U2, and pin 8 of transceiver chip U3 is electrically connected to pin 31 of control chip U2.

[0082] Pin 6 of transceiver chip U3 is electrically connected to the negative terminal of diode ZD3A, one end of capacitor C49, and one end of resistor R43, and is connected to the CAN-L interface for communication with an external instrument panel. The positive terminal of diode ZD3A is electrically connected to the positive terminal of diode ZD3B, and the other end of capacitor C49 is electrically connected to one end of capacitor C50.

[0083] Pin 7 of transceiver chip U3 is electrically connected to the negative terminal of diode ZD2A, one end of capacitor C45, and the other end of resistor R43, and is connected to the CAN-H interface for communication with an external instrument panel. The positive terminal of diode ZD2A is electrically connected to the positive terminal of diode ZD2B, and the other end of capacitor C45 is electrically connected to one end of capacitor C46. In this embodiment, the transceiver chip U3 is model CA-IF1051VS.

[0084] The other ends of capacitors C47, C46, ​​and C50, the cathodes of diodes ZD2B and ZD3B, and pin 2 of transceiver chip U3 are all grounded. In this embodiment, diodes ZD2A, ZD2B, ZD3A, and ZD3B are all Schottky diodes.

[0085] Transceiver chip U3 receives tire pressure, temperature, and other signals from control chip U2 via pin 1, converts these signals into differential signals, and transmits them to the CAN bus via pins 7 and 6. Converting tire pressure, temperature, and other signals into differential signals effectively improves anti-interference capabilities, reduces the impact of electromagnetic interference on the signals, and ensures signal stability during transmission. Transceiver chip U3 converts the differential signals from the CAN bus into digital signals and transmits them to control chip U2 via pin 4, enabling communication between control chip U2 and the instrument panel.

[0086] Capacitors C46, ​​C45, C49, and C50 filter out high-frequency noise on the CAN bus, preventing it from interfering with normal signal transmission and causing signal distortion or errors, thus improving signal quality and ensuring accurate signal transmission. Diodes ZD2A, ZD2B, ZD3A, and ZD3B are clamping diodes that effectively prevent overvoltage, limiting the voltage within a safe range and protecting the transceiver chip U3 from voltage spikes, preventing damage due to overvoltage.

[0087] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A dual-controller TPMS receiver circuit, characterized in that, It includes a power supply module, a receiving module, an auxiliary controller module, a main controller module, and a CAN communication module; The power supply module is electrically connected to an external power source. Its power output terminal is electrically connected to the power input terminals of the receiving module, auxiliary controller module, main controller module, and CAN communication module. The receiving module has an antenna (ANT) connected to its signal input terminal. Its signal output terminal is electrically connected to the signal input terminal of the auxiliary controller module, which stores the tire pressure signal. The auxiliary controller module's signal output terminal is electrically connected to the main controller module. The main controller module's communication terminal is electrically connected to the CAN communication module, which is electrically connected to an external instrument panel. The main controller module reads the tire pressure information from the auxiliary controller module and communicates with the external instrument panel via the CAN communication module.

2. The TPMS receiver circuit with dual controllers according to claim 1, characterized in that: The auxiliary controller module includes a control chip U6, resistors R3, R4, R41, R42, and capacitors C21, C22, and C23. The power supply module outputs a +3.3V voltage to one end of resistor R41, one end of resistor R42, one end of resistor R3, one end of capacitor C23, one end of capacitor C22, and pin 6 of control chip U6; the other ends of resistor R42 and resistor R41 are electrically connected to pins 1 and 2 of control chip U6, respectively, and the other end of resistor R3 is electrically connected to one end of capacitor C21 and pin 15 of control chip U6. Pin 12 of the control chip U6 is electrically connected to one end of resistor R4; pins 1, 2, 16, 17, 18, 19, and 20 of the control chip U6 are all electrically connected to the signal output terminal of the receiving module; pins 10 and 11 of the control chip U6 are electrically connected to the main control module. The other ends of resistor R4, capacitor C21, capacitor C22, capacitor C23, and pin 4 of control chip U6 are all grounded.

3. The TPMS receiver circuit with dual controllers according to claim 1, characterized in that: The power supply module includes voltage regulator chip U1, voltage regulator chip U5, varistor D3, diode D1, diode D2A, diode D2B, polarized capacitor C4, polarized capacitor C6, polarized capacitor C12, capacitor C1, capacitor C2, capacitor C3, capacitor C5, capacitor C8, capacitor C10 and resistors R1 and R2. The positive terminal of the external backup power supply is electrically connected to one end of the varistor D3, one end of the resistor R1, the positive terminal of the diode D1, and one end of the capacitor C1. The other end of the capacitor C1 is electrically connected to one end of the capacitor C2. The negative terminal of diode D1 is electrically connected to the positive terminal of polarized capacitor C4, one end of capacitor C10, and pin 2 of voltage regulator chip U1, and is also electrically connected to an external +12V voltage. Pin 3 of voltage regulator chip U1 is electrically connected to the positive terminal of polarized capacitor C6, one end of capacitor C5, and pins 1 and 3 of voltage regulator chip U5, and outputs +5V voltage to the CAN communication module. Pin 5 of voltage regulator chip U5 is electrically connected to one end of capacitor C8 and the positive terminal of polarized capacitor C12. The other end of resistor R1 is electrically connected to one end of resistor R2, one end of capacitor C3, the positive terminal of diode D2B, and the negative terminal of diode D2A. The positive terminal of diode D2A and pin 5 of voltage regulator chip U5 both output +3.3V voltage to the receiving module, auxiliary controller module, main controller module, and CAN communication module. The other end of the varistor D3, the other end of the capacitor C2, the negative terminal of the polarized capacitor C4, the other end of the capacitor C10, the negative terminal of the polarized capacitor C6, the other end of the capacitor C5, the other end of the capacitor C8, the negative terminal of the polarized capacitor C12, the other end of the capacitor C3, the other end of the resistor R2, the negative terminal of the diode D2B, and pin 1 of the voltage regulator chip U1 and pin 2 of the voltage regulator chip U5 are all grounded.

4. The TPMS receiver circuit with dual controllers according to claim 1, characterized in that: The receiving module includes an RF receiving chip U4, a crystal oscillator XT2, inductors L1, L2, L3, and L4, and capacitors C7, C11, C13, C14, C15, C16, C17, C18, and C19. The power supply module outputs a +3.3V voltage to one end of capacitor C7, one end of capacitor C11, and pins 4 and 7 of the RF receiver chip U4; the antenna ANT is electrically connected to one end of capacitor C18 and one end of capacitor C19, and the other end of capacitor C19 is electrically connected to one end of capacitor C15, one end of inductor L2, one end of inductor L3, and one end of capacitor C16. The other end of inductor L2 is electrically connected to one end of capacitor C17, one end of inductor L1, and pin 2 of RF receiver chip U4; the other end of capacitor C16 is electrically connected to one end of inductor L4, the other end of inductor L1, and pin 1 of RF receiver chip U4; pin 13 of RF receiver chip U4 is electrically connected to one end of crystal oscillator XT2 and one end of capacitor C14; pin 14 of RF receiver chip U4 is electrically connected to the other end of crystal oscillator XT2 and one end of capacitor C13; pins 8, 9, 10, 11, 12, 15, and 16 of RF receiver chip U4 are all electrically connected to the signal input terminal of the auxiliary controller module. The other ends of capacitor C18, capacitor C15, inductor L3, capacitor C17, inductor L4, capacitor C7, capacitor C11, capacitor C13, capacitor C14, and pins 5, 6, and 17 of the RF receiver chip are all grounded.

5. The TPMS receiver circuit with dual controllers according to claim 1, characterized in that: The main controller module includes a control chip U2, a resistor R39, a capacitor C41, a capacitor C44, a clock unit, and an IGN unit; The power supply module outputs a +3.3V voltage to one end of resistor R39, one end of capacitor C44, and pins 12 and 35 of control chip U2; an external +12V voltage is input to pin 37 of control chip U2. The other end of resistor R39 is electrically connected to one end of capacitor C34 and pin 4 of control chip U2; pin 10 of control chip U2 is electrically connected to one end of capacitor C41; the clock unit is electrically connected between pins 8 and 9 of control chip U2; the signal input terminal of IGN unit is connected to the external vehicle ignition switch, and the signal output terminal of IGN unit is electrically connected to pin 29 of control chip U2. Pins 42 and 43 of the control chip U2 are electrically connected to the auxiliary controller module, and pins 31, 33 and 34 of the control chip U2 are electrically connected to the CAN communication module. The other end of capacitor C34, the other end of capacitor C41, the other end of capacitor C44, and pins 11 and 36 of control chip U2 are all grounded.

6. The TPMS receiver circuit with dual controllers according to claim 5, characterized in that: The clock unit includes a crystal oscillator XT1, a resistor R40, and capacitors C35 and C36. Pin 8 of the control chip U2 is electrically connected to one end of resistor R40, one end of crystal oscillator XT1, and one end of capacitor C35. Pin 9 of the control chip U2 is electrically connected to the other end of resistor R40, the other end of crystal oscillator XT1, and one end of capacitor C36. The other ends of capacitors C35 and C36 are both grounded.

7. The TPMS receiver circuit with dual controllers according to claim 5, characterized in that: The IGN unit includes diode D5A, diode D5B, capacitor C9, capacitor C20, and resistors R10, R11, R12, and R14. The power supply module outputs a +3.3V voltage to the positive terminal of diode D5A; one end of resistor R11 is electrically connected to the positive terminal of the external backup power supply, and the other end of resistor R11 is electrically connected to one end of capacitor C9, one end of resistor R10, and one end of resistor R14, and serves as an input terminal connected to the external vehicle ignition switch; the other end of resistor R14 is electrically connected to one end of resistor R12, one end of capacitor C20, the negative terminal of diode D5A, and the positive terminal of diode D5B, and serves as an output terminal connected to pin 29 of control chip U2. The other end of capacitor C9, the other end of resistor R10, the other end of resistor R12, the other end of capacitor C20, and the negative terminal of diode D5B are all grounded.

8. The TPMS receiver circuit with dual controllers according to claim 1, characterized in that: The CAN communication module includes a transceiver chip U3, diodes ZD2A, ZD2B, ZD3A, and ZD3B, capacitors C47, C46, ​​C45, C49, and C50, and a resistor R43. The power supply module outputs +3.3V voltage to one end of capacitor C47 and pin 5 of transceiver chip U3, and outputs +5V voltage to pin 3 of transceiver chip U3; pins 1, 4, and 8 of transceiver chip U3 are all electrically connected to the main controller module. Pin 6 of the transceiver chip U3 is electrically connected to the negative terminal of diode ZD3A, one end of capacitor C49, and one end of resistor R43, and is connected to the CAN-L interface for communication with an external instrument panel; the positive terminal of diode ZD3A is electrically connected to the positive terminal of diode ZD3B, and the other end of capacitor C49 is electrically connected to one end of capacitor C50. Pin 7 of the transceiver chip U3 is electrically connected to the negative terminal of diode ZD2A, one end of capacitor C45, and the other end of resistor R43, and is connected to the CAN-H interface for communication with an external instrument panel; the positive terminal of diode ZD2A is electrically connected to the positive terminal of diode ZD2B, and the other end of capacitor C45 is electrically connected to one end of capacitor C46. The other ends of capacitor C47, capacitor C46, ​​capacitor C50, the negative terminal of diode ZD2B, the negative terminal of diode ZD3B, and pin 2 of transceiver chip U3 are all grounded.

9. The TPMS receiver circuit with dual controllers according to claim 8, characterized in that: Diodes ZD2A, ZD2B, ZD3A, and ZD3B are all Schottky diodes.

10. The TPMS receiver circuit with dual controllers according to claim 2, characterized in that: The control chip U6 is model number PY20F003F18U7.

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