Inductive-Load Control Circuit for Accurate Thermal Sensing
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Solution Overview
Problem
Recent advancements in electronic components have led to increased heat transfer in DC-DC converters, causing inaccurate temperature detection of inductive loads due to the close arrangement of overcurrent detection resistors and PTC thermistors, which complicates the detection of inductive load temperatures.
Innovation Solution
An inductive-load control circuit with a circuit board hosting a controller and driving circuit, an inductive load connected via a detection resistor group and a temperature measuring element, where the detection resistor group includes multiple resistors and the temperature measuring element is positioned between them, allowing for accurate temperature detection of the inductive load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electronic components are arranged closely to improve performance and reduce size, then productivity and compactness are improved, but heat transfer increases causing inaccurate temperature detection
Solution Approach 1:
The ground connection is segmented into two separate grounds: signal ground connected to the controller and power ground connected to the detection resistor group. This segmentation isolates the temperature measurement path from heat-generating components, allowing accurate temperature detection while maintaining compact component arrangement for improved productivity.
Solution Approach 2:
A dedicated temperature measuring element is introduced as an intermediary component between the detection resistor group and the signal measurement system. This intermediary element directly measures the temperature at the inductive load without being affected by heat from other components, resolving the measurement accuracy issue while allowing close component arrangement.
2Volume of moving object
If component arrangement is optimized for compactness, then device size is reduced, but heat transfer to detection components increases causing measurement errors
Solution Approach 1:
The ground system is divided into signal ground and power ground, physically separating the temperature measurement circuit from heat-generating power components. This allows compact overall device design while maintaining accurate temperature measurement by preventing heat transfer to the detection path.
Solution Approach 2:
Different ground connections are provided for different functional areas: signal ground for the controller and power ground for the detection resistor group. This local differentiation ensures that the temperature measurement area remains thermally isolated from heat sources, enabling compact design without sacrificing measurement precision.
3Device complexity
If a simple configuration is used for temperature detection, then device complexity is reduced, but accurate temperature detection of inductive load becomes difficult due to heat interference
Solution Approach 1:
The configuration uses simple ground segmentation into signal ground and power ground, which is easy to implement but effectively isolates the temperature measurement from heat interference. This simple segmented approach achieves accurate inductive load temperature detection without complicating the overall device design.
Solution Approach 2:
A temperature measuring element serves as a simple intermediary component that directly measures the temperature at the detection resistor group. This single added element provides accurate temperature detection without requiring complex measurement systems or increasing overall device complexity.
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 a simple configuration for accurately detecting the temperature of inductive loads, preventing overheating and potential fires by controlling current flow based on temperature thresholds.
Implementation Method 1
a temperature measuring element... capable of accurately detecting a temperature of the inductive load
Implementation Method 2
The driving circuit controls the electric power supplied by the power supply and applies the electric power to the inductive load
Implementation Method 3
a detection resistor group included in the driving circuit and connected in series with the inductive load
Data Source
AI summary
An inductive-load control circuit includes a circuit board on or in which a controller and a driving circuit are disposed, an inductive load disposed at a location apart from the circuit board and connected to the driving circuit of the circuit board, a detection resistor group included in the driving circuit and connected in series with the inductive load, and a temperature measuring element. The detection resistor group includes resistors. The temperature measuring element is disposed between the resistors. The controller and the driving circuit are supplied with electric power by a power supply. The driving circuit controls the electric power supplied by the power supply and applies the electric power to the inductive load. The circuit board has a signal ground connected to the controller and a power ground connected to the detection resistor group of the driving circuit. The temperature measuring element is connected to the power ground.