Power line state detection device and method of vehicle-mounted entertainment and instrument system

Abstract

The invention relates to a power line state detection device of a vehicle-mounted entertainment and instrument system, which comprises a first power supply circuit electrically connected with a vehicle body power supply, a second power supply circuit electrically connected with a vehicle key switch, and a first detection circuit of which one end is electrically connected with the first power supply circuit and the other end is electrically connected with a microprocessor, a third detection circuit of which one end is electrically connected with the output end of the first power supply circuitand the other end is electrically connected with the microprocessor, a second detection circuit of which one end is electrically connected with the second power supply circuit and the other end is electrically connected with the microprocessor, a conversion chip which of one end is electrically connected with the microprocessor and the other end is electrically connected with the input end of thedriving chip, a display end which is electrically connected with the microprocessor, and an alarm end which is electrically connected with the output end of the driving chip, wherein the output ends of the first power supply circuit and the second power supply circuit are electrically connected with the internal power supply end at the same time. The device and the method are simple and reasonablein design, low in cost and high in practicability. A double-insurance power supply effect is achieved, and the power supply reliability of the system is improved.

Description

technical field [0001] The invention relates to the technical field of automotive electronics, in particular to a device and method for detecting the state of a power line of a vehicle entertainment and instrumentation system. Background technique [0002] Vehicle-mounted entertainment and instrumentation system (hereinafter referred to as the system), in which the instrumentation system is the main component of the vehicle information display, displaying information such as vehicle speed and fuel level, which plays an important role in driving safety. In order to improve the power supply reliability of the system, a two-wire power supply method (one diode is set on each wire) is used to supply power to the system from the body battery, one of which is connected to the body battery, and the other is connected to the body switch. The key controls whether it is switched on. [0003] With the development of vehicle smart cabin system functions, the performance of SOC system (S...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that in the existing two-wire power supply mode, there is a Schottky diode on the main power supply line, and the reverse leakage current is relatively large. When a fault occurs on the circuit, it cannot be identified, and the main power supply line appears After the failure, the ordinary silicon diode of the auxiliary power supply line has a large power consumption, high heat generation, and is prone to failure, resulting in the failure of the entire system to work for a long time, affecting the use and safety of the car

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