On-Board Charger Terminal Temperature Sensing With Ambient Correction
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Solution Overview
Problem
Existing new energy vehicle charging systems face inaccuracies in temperature detection, which can lead to safety hazards such as fires during charging.
Innovation Solution
A temperature measurement circuit for vehicle-mounted charging devices, comprising first, second, and third temperature sensors, an analog-to-digital conversion module, and a microcontroller unit, which corrects temperature signals using ambient temperature compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature sensor is provided at each connection terminal to measure charging temperature, then temperature monitoring capability is improved, but measurement precision deteriorates due to ambient temperature interference
Solution Approach 1:
The patent segments the temperature measurement system into three independent temperature sensors: one at the positive connection terminal, one at the negative connection terminal, and one in the housing for ambient temperature. This segmentation allows separate measurement of terminal temperatures and ambient temperature, enabling subsequent compensation calculations to improve measurement precision while maintaining comprehensive monitoring capability.
Solution Approach 2:
The patent introduces ambient temperature as an intermediary variable to compensate for measurement errors. By measuring ambient temperature with a dedicated sensor and using it to correct terminal temperature readings through compensation calculations, the system eliminates the harmful effect of ambient temperature interference on measurement precision.
2Measurement precision
If multiple temperature sensors and compensation calculations are implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The microcontroller unit is designed to perform multiple functions: it controls the charging process, processes data from all three temperature sensors, performs compensation calculations, and manages communication. This multi-functionality consolidates what could be separate components into a single universal controller, improving measurement precision while limiting the increase in overall device complexity.
Solution Approach 2:
The patent merges the temperature measurement and compensation functionality into the existing charging control system. The microcontroller unit that already exists for charging control is extended to also handle temperature monitoring and compensation calculations, combining multiple functions into existing structural elements rather than adding entirely separate systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides more accurate charging temperature measurements, enhancing safety and efficiency by considering ambient temperature influences.
Implementation Method 1
a first temperature sensor which is provided at a positive electrode connection terminal of the vehicle-mounted charging device of the new energy vehicle and is configured to acquire a first analog quantity temperature signal of the positive electrode connection terminal
Implementation Method 2
an analog-to-digital conversion module which is configured to correspondingly converts the first analog quantity temperature signal, the second analog quantity temperature signal, and the analog quantity ambient temperature signal into a first digital quantity temperature signal, a second digital quantity temperature signal, and a digital quantity ambient temperature signal
Data Source
AI summary
A new energy vehicle, a vehicle-mounted charging device, a temperature measurement circuit, and a temperature measurement method. The circuit comprises: a first temperature sensor (TH1), which acquires a first analog quantity temperature signal of a positive electrode connection terminal; a second temperature sensor (TH2), which acquires a second analog quantity temperature signal of a negative electrode connection terminal; a third temperature sensor (TFH), which is provided in a housing of the vehicle-mounted charging device of the new energy vehicle and acquires an analog quantity ambient temperature signal of the vehicle-mounted charging device of the new energy vehicle; an analog-to-digital conversion module (10), which correspondingly converts the first analog quantity temperature signal, the second analog quantity temperature signal, and the analog quantity ambient temperature signal into a first digital quantity temperature signal, a second digital quantity temperature signal, and a digital quantity ambient temperature signal; and a micro-control unit (20), which corrects the first digital quantity temperature signal and the second digital quantity temperature signal according to the digital quantity ambient temperature signal. The accuracy of measuring the charging temperature of the vehicle-mounted charging device of the new energy vehicle can be improved.