EV Charging Connector Temperature Monitoring via Shared Bus
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Solution Overview
Problem
The existing charging apparatus for motor vehicles requires a high level of technical outlay in cabling due to individual electrical connections for each temperature sensor, leading to increased complexity and potential for temperature-related damage during charging.
Innovation Solution
A charging apparatus with temperature measuring elements connected via a common first connecting line and an individual second connecting line to an evaluation unit, utilizing controllable switches to selectively connect sensors, reducing cabling and enabling precise temperature measurement and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual temperature sensors are separately electrically connected to an operational amplifier by means of two electrical lines, then temperature monitoring precision is improved, but the outlay on cabling increases
Solution Approach 1:
Multiple temperature sensors share a common electrical connection line (common rail) for connecting to the operational amplifier. Instead of each sensor having separate two-wire connections, all sensors use one common line plus individual second lines, merging the return paths into a single shared conductor.
Solution Approach 2:
The common first connecting line serves multiple temperature sensors simultaneously, making it a multi-functional conductor that carries signals from all sensors. This universal connection line replaces multiple individual connection lines, reducing overall cabling while maintaining measurement capability.
2Measurement precision
If individual temperature sensors are separately electrically connected to an operational amplifier by means of two electrical lines, then temperature monitoring precision is improved, but the technical outlay increases
Solution Approach 1:
Multiple temperature sensors share a common electrical connection line (common rail) for connecting to the operational amplifier. Instead of each sensor having separate two-wire connections, all sensors use one common line plus individual second lines, merging the return paths into a single shared conductor.
3Device complexity
If multiple temperature measuring elements are connected to the evaluation unit simultaneously by a common electrical connection line, then cabling outlay is reduced, but offset currents may affect measurement precision
Solution Approach 1:
Temperature sensors are connected to the operational amplifier sequentially rather than simultaneously. The control unit activates one sensor at a time through controllable switches, creating periodic measurement cycles. This time-division multiplexing approach eliminates offset current interference while using a common connection line.
Solution Approach 2:
The electrical connection configuration dynamically changes over time through controllable switches that connect different sensors to the operational amplifier at different moments. The system transitions from a static simultaneous connection to a dynamic sequential connection, allowing the common line to be used for multiple sensors without offset current problems.
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
This configuration significantly reduces cabling requirements, allows for precise temperature monitoring and power management, preventing damage by efficiently connecting temperature measuring elements to an evaluation unit, and enabling reliable charging operations.
Implementation Method 1
a plurality of temperature measuring elements that are associated respectively with the plug connection members to detect a temperature of the plug connection members
Data Source
AI summary
A charging apparatus (22) for a motor vehicle (10) has a plurality of plug connection members (12, 14, 16) to connect the charging apparatus (22) to at least one external electrical energy source (18, 20), a plurality of temperature measuring elements (26, 28, 30) are associated respectively with the plug connection members (12, 14, 16) to detect a temperature of the plug connection members (12, 14, 16), and an evaluation unit (32) electrically connected to the temperature measuring elements (26, 28, 30) to evaluate the detected temperature of the temperature measuring elements (26, 28, 30). The temperature measuring elements (26, 28, 30) are connected to the evaluation unit (32) by a common first connecting line (42), and connectable electrically to the control unit (32) individually by a second connecting line (36, 38, 40) in each case.