Vehicle-mounted sensor power supply used for dangerous cargo transportation monitoring

Abstract

The invention discloses a vehicle-mounted sensor power supply used for dangerous cargo transportation monitoring, comprising a storage battery arranged in vehicle, a lithium battery and a power supply converter; wherein the power supply converter is composed of a voltage monitoring and dual power switching module, a charging / discharging logical judgement switching module, a charging discharging protection module, a charging constant current conversion output circuit, a 5V / 8A voltage conversion module and a 12V / 1A voltage conversion module, wherein the charging discharging protection module iscomposed of a lithium battery over discharge judging and on-off module and a lithium battery over charge judging and on-off module. The invention has the functions of two-path isolation output, dual power intelligent switching, hardware power supply protection, anti-electromagnetic interference and wide temperature operation support, various 5V and 12V vehicle-mounted sensor requirements of 24V electrical system vehicles can be met, and safe, stable and efficient power supply is carried out. The invention improves the reliability of vehicle-mounted sensor, and operations of sensor and data acquisition system thereof are ensured to be stable under the condition of vehicle power supply fluctuation and flameout.

Description

technical field [0001] The invention relates to a new vehicle-mounted power supply hardware design technology, in particular to a vehicle-mounted sensor power supply for in-transit monitoring of dangerous goods. Background technique [0002] The in-transit detection of dangerous goods is a special application in the field of modern transportation technology. system to obtain the safety status of vehicles in transit, realize real-time early warning and prevent accidents. Among them, when the electrical equipment in the car is running, it will generate a lot of electromagnetic interference. These interferences have a wide frequency band and spread to the power supply system through conduction, coupling or radiation, thereby affecting the normal operation of the sensor. Therefore, the safe and stable power supply of on-board sensors has become a key issue. This power supply unit not only has the ability to provide effective voltage drive, but also should have the ability to w...

AI Technical Summary

Problems solved by technology

[0004] The DC power adapter in the car can basically meet the power supply function. However, because the output current increases when the vehicle is ignited and started, the voltage of the battery may drop sharply in a short period of time to a minimum of 6-9V, or a maximum of 33-34V. Cause power output instability

This will cause hidden dangers to special sensors such as gas sensors and liquid sensors in the dangerous goods monitoring system

Secondly, the car’s DC power supply has no backup power supply when the vehicle is turned off, and this system requires that the engineering vehicle still needs to return vehicle geographic information through GPS when the vehicle is turned off. Therefore, the car’s DC adapter cannot guarantee the continuity of sensor data collection and storage.

[0005] Although ordinary batteries can completely separate from the dependence on the vehicle power supply, due to their shortcomings such as short life, low utilization rate, and poor load capacity, they do not have good reliability for the uninterrupted monitoring of the status of engineering vehicles.

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