Power Driving Chip Thermal Runaway Prevention
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Solution Overview
Problem
The increased heat generation in integrated-circuit components due to reduced transistor size and increased density leads to thermal runaway issues, affecting switching speeds, reliability, and lifetime, especially in power transistors where external heat dissipation systems may fail to maintain safe temperatures.
Innovation Solution
A power driving chip with an integrated power module, controller, and multi-level over-temperature protection circuit that measures internal temperature and generates load-shedding or overloading signals to control output power, reducing voltage, current, or duty cycle to prevent thermal runaway, with distinct trigger temperatures for the module and controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transistor size is reduced and density is increased, then integration capacity is improved, but heat generation increases causing thermal runaway
Solution Approach 1:
The patent implements preliminary thermal protection actions by setting multiple temperature thresholds (first trigger temperature and second trigger temperature) before thermal runaway occurs. The system proactively monitors temperature and takes preventive measures (reducing output power or turning off the power module) before the harmful thermal condition develops, thus resolving the contradiction between high integration and heat management.
Solution Approach 2:
The patent employs a feedback mechanism where the temperature detection circuit continuously monitors the temperature of the power module and feeds this information back to the control circuit. Based on the feedback temperature signal, the control circuit dynamically adjusts the output power of the power module, creating a closed-loop control system that balances integration capacity with thermal management.
2Temperature
If external heat dissipation system is used, then temperature control is improved, but system complexity increases
Solution Approach 1:
The patent extracts the thermal management function from the external heat dissipation system and implements it internally within the power driving chip. By integrating the temperature detection circuit and control logic directly into the chip, the system achieves temperature control without requiring complex external heat dissipation systems, thus reducing overall system complexity while maintaining effective temperature management.
Solution Approach 2:
The power driving chip performs self-thermal-management by incorporating temperature detection and control circuits within the chip itself. The system monitors its own temperature and automatically adjusts its operation to maintain safe temperature levels, eliminating the need for complex external thermal management systems and reducing overall system complexity.
3Reliability
If multi-level over-temperature protection is implemented, then thermal safety is improved, but circuit complexity increases
Solution Approach 1:
The patent segments the thermal protection function into multiple discrete temperature levels (first trigger temperature and second trigger temperature), each with distinct protection actions. This segmentation allows the system to provide graduated thermal protection responses rather than a single binary on/off control, improving thermal safety while keeping the circuit design modular and manageable.
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
Effectively prevents thermal runaway by dynamically adjusting output power based on temperature thresholds, ensuring continuous operation and preventing permanent damage by maintaining thermal control within safe limits.
Implementation Method 1
The multi-level over-temperature protection circuit is disposed in the integrated power module, and configured to measure an inner temperature of the integrated power module
Implementation Method 2
the controller decreases output power of the integrated power module according to the load-shedding driving signal
Implementation Method 3
an external heat dissipation system is required to solve this problem
Data Source
AI summary
A power driving chip and method are disclosed. The power driving chip includes an integrated power module disposed in a package structure and including a transistor and a gate driver electrically connected to the transistor; a controller disposed in the package structure and electrically connected to the integrated power module; and a multi-level over-temperature protection circuit for measuring an inner temperature of the integrated power module. When the inner temperature exceeds a first trigger temperature, the multi-level over-temperature protection circuit triggers the controller to reduce the output power of the integrated power module. When the inner temperature exceeds a second trigger temperature, the multi-level overheating protection circuit triggers the controller to turn off the integrated power module. The second trigger temperature is higher than the first trigger temperature.