Passive displayer in tire pressure monitoring system

Abstract

The invention discloses a passive displayer in a tire pressure monitoring system. The passive displayer in the tire pressure monitoring system comprises a display circuit and a power supply circuit, wherein the power supply circuit comprises a power supply BT1, a power supply management chip U3, a resistor R2, a capacitor C3 and a diode V5; the power supply management chip U3 is MCP73831; a pin VBAT of the power supply management chip U3 is respectively connected with one end of the capacitor C3, a positive electrode of the power supply BT1 and a positive electrode of the diode V5; the other end of the capacitor C3 and a negative electrode of the power supply BT1 are grounded; a negative electrode of the diode V5 is connected with a pin VDD of the power supply management chip MCP73831 to form a power supply output port which is connected with a power supply inlet end of the display circuit; a pin PROG of the power supply management chip MCP73831 is connected with the resistor R2 in series and then grounded. The passive displayer in the tire pressure monitoring system is capable of avoiding over-high surge brought by vehicle body voltage, protecting the display circuit and guaranteeing the normal operation of the display circuit.

Description

technical field [0001] The invention relates to a display in a tire pressure monitoring system, in particular to a passive display in a tire pressure monitoring system, and belongs to the technical field of TPMS. Background technique [0002] Tire pressure monitoring, also known as TPMS, is a real-time monitoring of the air pressure and temperature of automobile tires, displaying tire pressure and temperature values, allowing car owners to keep track of tire pressure and temperature conditions, timely discovering tire leaks, insufficient air pressure, and excessive air pressure, etc., to avoid A traffic accident caused by a blown tire. The tire pressure monitoring system includes a tire pressure sensor and a display. The tire pressure sensor monitors the air pressure of the car tires and transmits the air pressure to the display for display, thereby realizing the monitoring of the air pressure in the car tires. The display for tire pressure monitoring is usually installed i...

AI Technical Summary

Problems solved by technology

The display for tire pressure monitoring is usually installed in the cab of the car, and the display is powered by a DC power supply. At present, most TPMS receiving displays use the body power supply, and the voltage of the body is converted into a voltage that can be used by the TPMS display through a voltage conversion chip such as LM2591. The voltage of the body is 24V, there will be a large surge in the power supply to the TPMS receiving display, improper handling will cause the display power part to burn out, and it will not work normally, which will bring great inconvenience to consumers

Images