Optically-triggered multi-stage power system with monolithic integration
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Solution Overview
Problem
Current optically-triggered power systems face challenges such as high cost, technical complexity, and inefficiency due to the trade-off between wavelength of operation and optical absorption, as well as issues with electrical gain, switching speed, and high-temperature operability, particularly with devices like light-triggered thyristors and optothyristors that suffer from latch-up problems and voltage drops during conduction.
Innovation Solution
A multi-stage optically-triggered power system is developed, featuring a triggering stage responsive to optical triggers for direct photogeneration of carriers, which activates a main power device, enabling scalable and efficient power management with monolithically integrated stages and optimized materials like GaAs, GaN, and SiC for fast switching and high breakdown voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If light-triggered thyristors and optothyristors are used for optical triggering, then optical triggering capability is achieved, but latch-up problems and uncontrollable slow turn-off occur
Solution Approach 1:
The device is segmented into multiple functional regions: a triggering region that receives optical triggers and generates carriers, and a power region that handles high-power switching. This segmentation allows the triggering region to be optimized for optical response while the power region handles conduction, eliminating the latch-up problem inherent in traditional optothyristors by separating the triggering function from the power handling function.
Solution Approach 2:
Photogenerated carriers act as an intermediary between the optical trigger and the power switching function. The optical trigger generates carriers in the triggering region, which then modulate the conductivity of the power region, enabling controlled turn-on and turn-off without direct electrical connection and avoiding latch-up conditions.
2Extent of automation
If vertical devices like optothyristors are used, then optical triggering is achieved, but large voltage drop across the device during conduction occurs
Solution Approach 1:
Different regions of the device are assigned different doping concentrations and structural characteristics optimized for their specific functions. The triggering region has properties optimized for optical carrier generation, while the power region has properties optimized for low-resistance conduction. This local optimization reduces overall voltage drop during conduction while maintaining optical triggering capability.
3Productivity
If higher switching frequency is used in ETD, then power processing capability is improved, but parasitic oscillations are induced in the driver circuit
Solution Approach 1:
The electrical gate driver system is replaced with an optical triggering system. Optical signals have no parasitic inductance or capacitance coupling issues that plague electrical drivers at high frequencies. The optical trigger directly generates carriers in the semiconductor without requiring high-speed electrical signal transmission, eliminating parasitic oscillations and enabling stable operation at higher switching frequencies.
4Device complexity
If electrical triggering is used, then system integration is achieved, but electromagnetic-interference effects and gate-driver failure occur
Solution Approach 1:
Optical signals serve as an intermediary between the control system and the power device, replacing direct electrical connection. This optical intermediary provides complete isolation between the gate driver and power stage, blocking electromagnetic interference while still enabling precise control of the power device switching operations.
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 system achieves efficient, high-frequency repetitive switching with low on-resistance and rapid turn-on/turn-off capabilities, reducing weight, volume, and power requirements, while maintaining high-temperature operability and immunity to electromagnetic interference, thus enhancing power density and system reliability.
Implementation Method 1
at least one triggering stage that is responsive to at least one optical trigger to directly create photogeneration of carriers in the at least one triggering stage
Data Source
AI summary
A multi-stage optically-triggered power system. At least one triggering stage is responsive to at least one optical trigger to directly create photogeneration of carriers in the at least one triggering stage and thus generate at least one output signal. At least one main power device stage coupled to the at least one triggering stage is responsive to the at least one generated output signal to activate the at least one main power device stage. The at least one triggering stage and the at least one main power device stage may be monolithically integrated.