Switching Component Thermal Management for Power Supply Lifespan
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Solution Overview
Problem
Switching components in switch-mode power supplies, such as FETs and IGBTs, are prone to premature failure due to repetitive thermal cycles caused by alternating hot and cool junction temperatures, which will be exacerbated by increasing power levels.
Innovation Solution
A thermally managed power supply system that includes a thermal controller to open and close switches, increasing the low temperature of each switch to reduce the temperature differential between high and low temperatures, thereby mitigating mechanical stresses from thermal expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If switching devices operate at high power levels, then power output is improved, but thermal differential and temperature cycling increase causing premature failure
Solution Approach 1:
The system performs preliminary heating of the switching device junction to a predetermined temperature before normal operation begins. This pre-heating action ensures the device starts at an elevated temperature baseline, preventing excessive cooling during low-power intervals and reducing thermal cycling stress throughout operation.
Solution Approach 2:
The system dynamically adjusts the junction temperature parameter by controlling the heating duration and intensity. A temperature controller monitors and regulates the heating process to maintain the junction temperature within an optimal range, changing the thermal parameter to balance power output with device reliability.
2Productivity
If switching devices are subjected to repetitive thermal cycles, then power supply operation is maintained, but bond wires and attachment points experience thermal expansion and contraction causing failure
Solution Approach 1:
The system applies preliminary heating to elevate the baseline junction temperature before repetitive switching cycles begin. This preliminary thermal conditioning reduces the magnitude of subsequent thermal expansion and contraction cycles, protecting bond wires and attachment points from mechanical fatigue while maintaining operational productivity.
3Reliability
If the low temperature of switches is increased to reduce temperature differential, then thermal stress is reduced, but additional heating energy is required
Solution Approach 1:
The system optimizes the heating parameter by controlling the junction temperature to a specific predetermined range rather than continuously heating. The temperature controller adjusts heating duration and intensity to achieve the minimum necessary temperature elevation, balancing reliability improvement with energy consumption minimization.
Solution Approach 2:
The heating function is integrated into the normal operation cycle, where heating occurs during intervals when full power output is not required. This continuous integration ensures the switching device maintains an elevated baseline temperature without requiring separate dedicated heating energy input, reducing overall energy consumption while maintaining component reliability.
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 effectively prolongs the lifespan of switching components by maintaining a more constant temperature, reducing the likelihood of mechanical stress-related failures and enhancing the reliability of switch-mode power supplies under increasing power demands.
Implementation Method 1
a thermal controller is configured to open and close the one or more switches to reduce a temperature differential that occurs between a low temperature and a high temperature of each switch by increasing the low temperature of each switch
Implementation Method 2
short bursts of alternating hot and cool junction temperatures, caused by short repetitive bursts of output power, causes thermal expansion and contraction in bond wires and attachment points of the switching devices
Data Source
AI summary
Systems and methods for operating switches of a power supply are disclosed. The method includes generating power with a power source and switchably coupling the power source to an output of the power supply. One or more switches are opened and closed to generate a voltage waveform at the output, and in addition, the one or more switches are opened and closed to reduce a temperature differential that occurs between a low temperature and a high temperature of each switch by increasing the low temperature of each switch.