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CN-224210846-U - Tire pressure signal receiving circuit

CN224210846UCN 224210846 UCN224210846 UCN 224210846UCN-224210846-U

Abstract

The utility model relates to the field of tire pressure sensors, in particular to a tire pressure signal receiving circuit which comprises a power supply module, an MCU module, a CAN module and an RF module, wherein the output end of the power supply module is electrically connected with the MCU module, the CAN module and the RF module, the input end of the RF module is connected with an antenna ANT, the output end of the RF module is electrically connected with the input end of the MCU module, a communication interface of the MCU module is electrically connected with the CAN module, the power supply module supplies power to the MCU module, the CAN module and the RF module, the RF module receives data such as tire pressure information and temperature collected by the sensors through the antenna ANT and transmits the data such as the tire pressure information and the temperature to the MCU module, the MCU module transmits the data such as the tire pressure information and the temperature to a vehicle central control, and the central control displays and early warns the data such as the tire pressure information, so that the overall complexity of the receiving circuit is effectively reduced, and the use cost is reduced.

Inventors

  • YANG XINGYU

Assignees

  • 厦门东南山科技有限公司

Dates

Publication Date
20260508
Application Date
20250627

Claims (9)

  1. 1. The tire pressure signal receiving circuit is characterized by comprising a power supply module, an MCU module, a CAN module and an RF module; the intelligent sensor comprises an MCU module, a CAN module, an RF module, an antenna ANT, an output end of the power module, a communication interface of the MCU module, a communication interface of the CAN module, an external central controller and a communication interface of the MCU module.
  2. 2. The tire pressure signal receiving circuit according to claim 1, wherein the power module comprises a voltage regulator chip U1, a voltage regulator chip U5, a voltage dependent resistor ZB1, a diode D2B, a diode D2A, a polar capacitor C4, a polar capacitor C6, a polar capacitor C12, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C5, a capacitor C7, a capacitor C8, a resistor R1, and a resistor R2; The anode of the external standby power supply is electrically connected with one end of the piezoresistor ZB1, one end of the resistor R1, the anode of the diode D1 and one end of the capacitor C2, and the other end of the capacitor C2 is electrically connected with one end of the capacitor C3; The cathode of the diode D1 is electrically connected with the anode of the polar capacitor C4, one end of the capacitor C5 and the pin 1 of the voltage stabilizing chip U1 and is electrically connected with external +12V voltage, the pin 3 of the voltage stabilizing chip U1 is electrically connected with the anode of the polar capacitor C6, one end of the capacitor C7 and the pins 1 and 3 of the voltage stabilizing chip U5 and outputs +5V voltage to the CAN module, the pin 5 of the voltage stabilizing chip U5 is electrically connected with one end of the capacitor C8 and the anode of the polar capacitor C12, the other end of the resistor R1 is electrically connected with one end of the resistor R2, one end of the capacitor C1, the anode of the diode D2B and the cathode of the diode D2A, and the cathode of the diode D2B and the pin 5 of the voltage stabilizing chip U5 output +3V voltage to the MCU module, the CAN module and the RF module; The other end of the piezoresistor ZB1, the other end of the capacitor C3, the negative electrode of the polar capacitor C4, the other end of the capacitor C5, the negative electrode of the polar capacitor C6, the other end of the capacitor C7, the other end of the capacitor C8, the negative electrode of the polar capacitor C12, the other end of the capacitor C1, the other end of the resistor R2, the positive electrode of the diode D2A, the pin 2 of the voltage stabilizing chip U1 and the pin 2 of the voltage stabilizing chip U5 are all grounded.
  3. 3. The tire pressure signal receiving circuit according to claim 1, wherein the MCU module comprises a control chip U2, a resistor R39, a resistor R41, a resistor R42, a capacitor C36, a capacitor C41 and a capacitor C44; The power supply module outputs +3.3V voltage to one end of a resistor R41, one end of a resistor R42, one end of a resistor R39, one end of a capacitor C44, a pin 12 of a control chip U2 and a pin 35 of the control chip U2, and external +12V voltage is input to a pin 37 of the control chip U2; The other end of the resistor R39 is electrically connected with one end of the capacitor C34 and the pin 4 of the control chip U2, the pin 10 of the control chip U2 is electrically connected with one end of the capacitor C41, the other end of the resistor R41 is electrically connected with the pin 14 and the pin 15 of the control chip U2, and the other end of the resistor R42 is electrically connected with the pin 13 of the control chip U2; The pins 13, 14, 16, 17, 22, 23 and 24 of the control chip U2 are electrically connected with the output end of the RF module, and the pins 31, 33 and 34 of the control chip U2 are electrically connected with the CAN module; The other end of the capacitor C34, the other end of the capacitor C41, the other end of the capacitor C44, the pin 11 of the control chip U2 and the pin 36 are grounded.
  4. 4. The tire pressure signal receiving circuit according to claim 2, further comprising a clock module, wherein the clock module comprises a crystal oscillator XT1, a resistor R34, a capacitor C35 and a capacitor C36; The pin 8 of the control chip U2 is electrically connected with one end of the resistor R34, one end of the crystal oscillator XT1 and one end of the capacitor C35, the pin 9 of the control chip U2 is electrically connected with the other end of the resistor R34, the other end of the crystal oscillator XT1 and one end of the capacitor C36, and the other end of the capacitor C35 and the other end of the capacitor C36 are grounded.
  5. 5. The tire pressure signal receiving circuit of claim 1, wherein the RT module comprises a radio frequency receiving chip U4, a crystal oscillator XT2, an inductor L1, an inductor L2, an inductor L3, an inductor L4, an inductor C19, a capacitor C18, a capacitor C17, a capacitor C16, a capacitor C15, a capacitor C10, a capacitor C11, a capacitor C13, and a capacitor C14; The power supply module outputs +3.3V voltage to one end of a capacitor C10, one end of a capacitor C11, a pin 4 and a pin 7 of a radio frequency receiving chip U4, the antenna ANT is electrically connected with one end of a capacitor C18 and one end of an inductor C19, and the other end of the inductor C19 is electrically connected with one end of a capacitor C17, one end of an inductor L4, one end of an inductor L3 and one end of a capacitor C16; The other end of the inductor L3 is electrically connected with one end of the capacitor C15, one end of the inductor L1 and the pin 2 of the radio frequency receiving chip U4, the other end of the capacitor C16 is electrically connected with one end of the inductor L2, the other end of the inductor L1 and the pin 1 of the radio frequency receiving chip U4, the pin 13 of the radio frequency receiving chip U4 is electrically connected with one end of the crystal oscillator XT2 and one end of the capacitor C14, the pin 14 of the radio frequency receiving chip U4 is electrically connected with the other end of the crystal oscillator XT2 and one end of the capacitor C13, and the pin 8, the pin 9, the pin 10, the pin 11, the pin 12, the pin 15 and the pin 16 of the radio frequency receiving chip U4 are electrically connected with the signal input end of the MCU module; The other end of the capacitor C18, the other end of the capacitor C17, the other end of the inductor L4, the other end of the capacitor C15, the other end of the inductor L2, the other end of the capacitor C10, the other end of the capacitor C11, the other end of the capacitor C13, the other end of the capacitor C14, and the pins 5, 6 and 17 of the radio frequency receiving chip are all grounded.
  6. 6. The tire pressure signal receiving circuit according to claim 1, wherein the CAN module includes a transceiver chip U3, a diode ZD2A, a diode ZD2B, a diode ZD3A, a diode ZD3B, a capacitor C47, a capacitor C46, a capacitor C45, a capacitor C49, a capacitor C50, and a resistor R43; The power supply module outputs +3.3V voltage to one end of the capacitor C47 and the pin 5 of the transceiver chip U3, and the power supply module outputs +5V voltage to the pin 3 of the transceiver chip U3, wherein the pin 1, the pin 4 and the pin 8 of the transceiver chip U3 are electrically connected with the MCU module; The pin 6 of the transceiver chip U3 is electrically connected with the cathode of the diode ZD3A, one end of the capacitor C49 and one end of the resistor R43, and is connected with an interface CAN-L to be in communication connection with the outside center control, the anode of the diode ZD3A is electrically connected with the anode of the diode ZD3B, the other end of the capacitor C49 is electrically connected with one end of the capacitor C50, the pin 7 of the transceiver chip U3 is electrically connected with the cathode of the diode ZD2A, one end of the capacitor C46 and the other end of the resistor R43, and is connected with an interface CAN-H to be in communication connection with the outside center control, the anode of the diode ZD2A is electrically connected with the anode of the diode ZD2B, and the other end of the capacitor C46 is electrically connected with one end of the capacitor C45; The other end of the capacitor C47, the other end of the capacitor C45, the other end of the capacitor C50, the negative electrode of the diode ZD2B, the negative electrode of the diode ZD3B and the pin 2 of the transceiver chip U3 are all grounded.
  7. 7. The tire pressure signal receiving circuit according to claim 6, wherein the diode ZD2A, the diode ZD2B, the diode ZD3A, and the diode ZD3B are schottky diodes.
  8. 8. The tire pressure signal receiving circuit of claim 1, further comprising an IGN module, wherein a signal input of the IGN module is connected to an external vehicle ignition switch, a signal output of the IGN module is electrically connected to the MCU module, and the IGN module monitors a vehicle state.
  9. 9. The tire pressure signal receiving circuit of claim 8, wherein the IGN module comprises a diode D5A, a diode D5B, a capacitor C9, a capacitor C2, a resistor R10, a resistor R11, a resistor R12, and a resistor R14; The power supply module outputs +3.3V voltage to the cathode of the diode D5B, one end of the resistor R11 is electrically connected with the anode of an external standby power supply, the other end of the resistor R11 is electrically connected with one end of the capacitor C9, one end of the resistor R10 and one end of the resistor R14 and is used as an input end to be connected with an external vehicle ignition switch, and the other end of the resistor R14 is electrically connected with one end of the resistor R12, one end of the capacitor C20, the cathode of the diode D5A and the anode of the diode D5B and is used as an output end to be electrically connected with the MCU module; The other end of the capacitor C9, the other end of the resistor R10, the other end of the resistor R12, the other end of the capacitor C20 and the anode of the diode D5A are grounded.

Description

Tire pressure signal receiving circuit Technical Field The utility model relates to the field of tire pressure sensors, in particular to a tire pressure signal receiving circuit. Background The sensor is a detection device, which is just like the extension of our sensory system, can sense various physical quantity, chemical quantity or biomass information in the surrounding environment, and convert the non-electrical quantity into an electric signal or other signal forms which are easy to process and transmit according to a certain rule so as to facilitate subsequent operations such as measurement, control, display or recording. The tire pressure receiving circuit of the tire pressure sensor is a key component part in a Tire Pressure Monitoring System (TPMS), and has the main functions of receiving wireless signals transmitted by the tire pressure sensor, demodulating and decoding the signals and the like, thereby acquiring information of the tire pressure, the temperature and the like of the tire. The invention patent with the application number of CN202111359397.X is named as a tire pressure detection signal receiving circuit, a system and a method, which uses a synchronization module to synchronize and filter a received coded baseband signal, a configuration module outputs a preset baud rate and a preset synchronization mode, a detection module detects the processed baseband signal based on the preset baud rate and outputs an effective signal and an actual baud rate, a clock generation module receives the preset baud rate or the actual baud rate and outputs a baud rate clock, a frame synchronization module receives the effective signal and the baud rate clock, samples the effective signal, matches the sampled signal with the preset synchronization mode and outputs a buffer signal, a decoding module receives the buffer signal and the baud rate clock, decodes the decoded data and sends the decoded data to an application module, but the whole structure is complex, and the use cost is high. Disclosure of utility model The utility model aims to provide a tire pressure signal receiving circuit, which aims to solve the problem that the conventional tire pressure signal receiving circuit is complex in overall structure and high in use cost. In order to achieve the above purpose, the present utility model adopts the following technical scheme: a tire pressure signal receiving circuit comprises a power supply module, an MCU module, a CAN module and an RF module; The intelligent sensor comprises an MCU module, a CAN module, an RF module, an antenna ANT, an output end of the power module, a communication interface of the MCU module, a communication interface of the CAN module, an external central controller and a communication interface of the MCU module. Further, the power module includes a voltage stabilizing chip U1, a voltage stabilizing chip U5, a voltage dependent resistor ZB1, a diode D2B, a diode D2A, a polar capacitor C4, a polar capacitor C6, a polar capacitor C12, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C5, a capacitor C7, a capacitor C8, a resistor R1, and a resistor R2; The anode of the external standby power supply is electrically connected with one end of the piezoresistor ZB1, one end of the resistor R1, the anode of the diode D1 and one end of the capacitor C2, and the other end of the capacitor C2 is electrically connected with one end of the capacitor C3; The cathode of the diode D1 is electrically connected with the anode of the polar capacitor C4, one end of the capacitor C5 and the pin 1 of the voltage stabilizing chip U1 and is electrically connected with external +12V voltage, the pin 3 of the voltage stabilizing chip U1 is electrically connected with the anode of the polar capacitor C6, one end of the capacitor C7 and the pins 1 and 3 of the voltage stabilizing chip U5 and outputs +5V voltage to the CAN module, the pin 5 of the voltage stabilizing chip U5 is electrically connected with one end of the capacitor C8 and the anode of the polar capacitor C12, the other end of the resistor R1 is electrically connected with one end of the resistor R2, one end of the capacitor C1, the anode of the diode D2B and the cathode of the diode D2A, and the cathode of the diode D2B and the pin 5 of the voltage stabilizing chip U5 output +3V voltage to the MCU module, the CAN module and the RF module; The other end of the piezoresistor ZB1, the other end of the capacitor C3, the negative electrode of the polar capacitor C4, the other end of the capacitor C5, the negative electrode of the polar capacitor C6, the other end of the capacitor C7, the other end of the capacitor C8, the negative electrode of the polar capacitor C12, the other end of the capacitor C1, the other end of the resistor R2, the positive electrode of the diode D2A, the pin 2 of the voltage stabilizing chip U1 and the pin 2 of the voltage stabilizing chip U5 are all grounded. Further, the MCU module comprises a control ch