Power Switch Control via Dynamic Thyristor Threshold
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Solution Overview
Problem
Existing power switches, such as ThyFET switches, face challenges in reducing power losses and thermal stress due to changes in temperature and device degradation, which affect the optimal operation of thyristor-based and FET-based branches, leading to sub-optimal power loss profiles.
Innovation Solution
A power switch design that includes a controller to dynamically adjust the voltage threshold for switching between FET-based and thyristor-based branches based on current magnitude and operating conditions, ensuring efficient current sharing and minimizing power losses by turning on the thyristor-based branch at higher currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed turn-on threshold level is used for the thyristor device, then the control is simple, but power losses increase due to temperature changes and device degradation
Solution Approach 1:
The patent implements dynamic threshold adjustment by continuously monitoring the forward voltage across the thyristor device and adapting the turn-on threshold level in real-time. This allows the power switch to optimize current distribution between FET and thyristor branches according to actual operating conditions, thereby reducing power losses while maintaining manageable control complexity through automated feedback mechanisms.
Solution Approach 2:
The system employs feedback control by measuring the forward voltage of the thyristor device and using this information to dynamically adjust the turn-on threshold. This closed-loop approach enables the controller to compensate for temperature variations and device degradation, ensuring optimal power loss performance without requiring complex manual calibration or adjustment procedures.
2Loss of energy
If the thyristor-based branch is used at high currents, then power losses are reduced, but thermal stress increases
Solution Approach 1:
The patent dynamically adjusts the turn-on threshold for the thyristor device based on real-time forward voltage measurements, enabling adaptive current distribution between branches. This dynamic control allows the system to optimize power loss reduction while managing thermal stress by responding to actual operating conditions rather than using fixed thresholds.
Solution Approach 2:
The system changes the operational parameters by dynamically modifying the turn-on threshold voltage level based on measured forward voltage characteristics. This parameter adaptation allows optimal switching behavior across different operating conditions, balancing power loss reduction with thermal management by adjusting when the thyristor branch becomes active.
3Loss of energy
If dynamic threshold adjustment is implemented, then power losses are reduced, but device complexity increases
Solution Approach 1:
The patent uses feedback control where the controller continuously monitors the forward voltage across the thyristor device and automatically adjusts the turn-on threshold accordingly. This automated feedback mechanism reduces power losses through adaptive control while keeping the control system complexity manageable by relying on straightforward voltage measurement and comparison operations.
Solution Approach 2:
The system implements self-service control where the power switch automatically adjusts its own operating parameters based on real-time measurements of its internal state. The controller monitors forward voltage and autonomously determines optimal threshold levels without requiring external intervention or complex control algorithms, thereby reducing power losses while maintaining relatively simple device architecture.
Data Source
AI summary
Systems, methods, techniques and apparatuses of power switch control are disclosed. One exemplary embodiment is a power switch comprising a thyristor-based branch including a thyristor device; a FET-based branch coupled in parallel with the thyristor-based branch and including a FET device; and a controller. The controller is structured to turn on the FET device, turn on the thyristor device after turning on the FET device based on a thyristor voltage threshold, and update the thyristor voltage threshold based on a voltage measurement corresponding to the thyristor-based branch measured while the thyristor device is turned on.