Power Resistor Plug-On Housing for Thermal Management
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Solution Overview
Problem
Existing power resistors face reduced stability and lifespan due to thermal stress from power losses, as well as mechanical and chemical damage risks when electronic circuits for monitoring are integrated within the housing, which affects their accuracy and longevity.
Innovation Solution
A power resistor design featuring a plug-on housing that encases the electronic circuit externally, maintaining a free contact surface for heat dissipation, and using a detachable mechanical connection to the resistor housing, along with encapsulation and secure electrical connections, to reduce thermal stress and enhance protection from environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic circuit is arranged in the housing of the power component to increase monitoring accuracy, then the monitoring function is improved, but the circuit is subjected to high temperature from power losses which reduces its service life
Solution Approach 1:
The housing is divided into two separate parts: the resistor housing containing the power resistor element, and the plug-on housing containing the electronic circuit. This segmentation allows each component to be optimized independently - the power resistor can operate at high temperature while the circuit operates at lower temperature, resolving the contradiction between monitoring accuracy and service life.
Solution Approach 2:
The plug-on housing acts as an intermediary structure that connects to the resistor housing but maintains thermal separation. It provides mechanical connection and electrical signal transmission while preventing direct thermal coupling, allowing the circuit to be protected from high temperature while still performing monitoring functions.
2Duration of action of stationary object
If the electronic circuit is provided on the outside of the housing to reduce thermal load, then the circuit service life is improved, but the risk of damage from mechanical and chemical forces increases
Solution Approach 1:
The electronic circuit is nested within the plug-on housing, which itself connects to the resistor housing. This nested structure provides protection for the circuit against mechanical and chemical forces while maintaining thermal separation. The plug-on housing acts as a protective enclosure that shields the circuit without subjecting it to high temperature.
3Reliability
If a plug-on housing is used to protect the circuit externally, then the circuit is protected from thermal stress, but the heat dissipation of the power resistor may be impaired
Solution Approach 1:
The plug-on housing is designed to connect to specific locations on the resistor housing that do not interfere with the primary heat dissipation paths. The housing geometry and connection points are optimized to minimize interference with thermal flow from the resistor element to the heat sink, allowing circuit protection without significantly compromising heat dissipation efficiency.
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 design enhances the stability and lifespan of the power resistor by minimizing thermal impact on the circuit, protecting it from mechanical and chemical damage, and facilitating easy maintenance while maintaining precise monitoring capabilities.
Implementation Method 1
at least one resistor housing cast with casting compound (26.1), which forms at least one resistor element (3)
Implementation Method 2
forms a first contact surface (5) for a heat sink (27) on a first outside (2.1)
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a power resistor (1) having electrical connection points (6.1, 6.2), comprising at least one resistor housing (2), which is potted with potting compound (26.1) and which forms at least one resistance element (3), in particular from a thick-film material, and which forms a first contact surface (5) for a heat sink (27) on a first outer face (2.1), and comprising an electronic circuit (9) for diagnosing and/or monitoring the power resistor (1). In order to increase the stability of the power resistor, according to the invention, the power resistor has a slide-on housing (10), which is designed to mechanically connect, in particular releasably, to the resistor housing (2) in such a way that the first contact surface (5) is kept free and which accommodates the circuit (9) in an encapsulating manner.