Hybrid Diamond Circuit Protector for Heat Management
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Solution Overview
Problem
Conventional circuit breakers face limitations in precision and quick response to faults due to mechanical construction, and power semiconductor devices suffer from significant I2RON losses and heat-related damage despite their advantages, requiring large and bulky designs to manage heat.
Innovation Solution
A solid-state circuit protector using a conventional power semiconductor device in parallel with a diamond-based device, where the diamond device's ON resistance decreases with temperature, allowing current diversion and heat management to protect the conventional device from overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If power semiconductor devices are used to replace mechanical circuit breakers, then response speed and precision are improved, but heat generation and device durability worsen due to I2RON losses
Solution Approach 1:
The patent employs a hybrid semiconductor structure combining diamond and silicon carbide materials. The diamond layer (0.5-5 micrometers thick) provides ultra-low ON resistance and exceptional thermal conductivity to handle high currents during faults, while the silicon carbide layer provides mechanical support and electrical isolation. This composite material approach enables the device to achieve both fast response speed and low heat generation simultaneously.
Solution Approach 2:
The invention changes the material parameter (semiconductor type) to achieve different ON resistance characteristics. Diamond semiconductors have inherently lower ON resistance and higher thermal conductivity compared to conventional silicon or silicon carbide devices. By utilizing this parameter change, the device can conduct high currents with minimal I2RON losses, thereby reducing heat generation while maintaining fast response capability.
2Temperature
If the size and bulk of power semiconductor device are increased to manage heat, then heat dissipation is improved, but device complexity and space requirements worsen
Solution Approach 1:
The hybrid diamond-silicon carbide structure inherently provides superior thermal management properties. The diamond layer's exceptional thermal conductivity (5-10 times higher than silicon carbide) enables efficient heat dissipation at the source, eliminating the need for large external heat sinks. This allows compact device design while maintaining effective temperature control during high-current fault conditions.
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 manages heat and extends the lifespan of power semiconductor devices by diverting high currents through the diamond device, reducing ON resistance and preventing damage, while maintaining precision and quick response times.
Implementation Method 1
I2RON losses can be significant, especially when the current flowing through the power semiconductor device is high. I2RON losses are compounded by the fact that the ON resistance RON resistance of conventional power semiconductor devices tends to increase as temperature increases. Because I2RON losses manifest in the form of heat
Data Source
AI summary
A solid-state circuit protector includes a first power semiconductor device having an ON resistance that increases with increasing temperature and a second power semiconductor device connected in parallel with the first power semiconductor device having an ON resistance that decreases with increasing temperature. During times when abnormally high currents are flowing through the solid-state circuit protector, the second power semiconductor is switched ON so that some or all of the current is diverted through it, thus protecting the first power semiconductor device from being damaged due to overheating. The first power semiconductor device is either switched OFF, allowing it to cool in anticipation of a lighter load, or is configured to remain ON so that it shares the burden of carrying the high current with the parallel-connected second power semiconductor device yet operates cooler and at a lower ON resistance since it is not required to pass the full current.