Switching Element Control Circuit Temperature Compensation
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Solution Overview
Problem
Conventional switching element control circuits face challenges in reducing switching loss due to changes in threshold voltage with operating temperature, making it difficult to shorten turn-on and turn-off periods and increase switching speed.
Innovation Solution
A switching element control circuit that includes a temperature detection part, a memory part for storing initial threshold voltage and temperature data, and a threshold voltage calculation part to adjust the third electrode voltage based on the operation temperature, allowing for precise control of the switching element's ON/OFF operation even when the threshold voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a gate voltage slightly exceeding the initial threshold voltage is applied to the gate electrode to shorten turn-on and turn-off periods, then switching speed is increased, but switching loss cannot be reduced when operating temperature exceeds initial measurement temperature due to threshold voltage changes
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gate voltage based on the detected operating temperature. The control circuit modifies the voltage parameter to compensate for threshold voltage drift, ensuring optimal switching performance across different temperature conditions. This resolves the contradiction by adapting the gate voltage parameter rather than using a fixed value, thereby maintaining both fast switching speed and low switching loss throughout the operating temperature range.
Solution Approach 2:
The patent implements feedback control by detecting the operating temperature and using this information to adjust the gate voltage. The temperature detection circuit provides real-time feedback about the switching element's thermal state, which the control circuit then uses to modulate the gate voltage accordingly. This feedback mechanism enables the system to automatically compensate for temperature-induced threshold voltage changes, achieving both high switching speed and low switching loss under varying temperature conditions.
2Reliability
If the gate voltage is increased to ensure reliable switching, then switching reliability is improved, but switching loss increases and switching speed decreases
Solution Approach 1:
The patent uses parameter changes to optimize the gate voltage to the minimum necessary value for reliable switching. By adjusting the voltage parameter based on actual operating conditions rather than using a conservative high fixed value, the system achieves reliable switching with reduced energy loss. This dynamic parameter adjustment prevents excessive gate voltage application that would increase switching loss while maintaining adequate switching reliability.
Solution Approach 2:
The patent applies partial action by providing just enough gate voltage to achieve reliable switching without excessive over-volting. Instead of applying a consistently high gate voltage to ensure reliability under all conditions, the system provides the precise amount of voltage needed based on actual temperature and threshold voltage conditions. This approach achieves sufficient switching reliability while minimizing the energy loss associated with excessive gate voltage application.
3Device complexity
If a fixed gate voltage is used for controlling the switching element, then device complexity is reduced, but switching performance deteriorates when operating temperature changes
Solution Approach 1:
The patent implements feedback control with temperature detection and adaptive gate voltage adjustment. The temperature detection circuit monitors the operating conditions and provides feedback to the control circuit, which then modulates the gate voltage accordingly. This feedback mechanism enables the system to maintain optimal switching speed across different temperature conditions without requiring overly complex control logic, achieving a balance between performance and complexity.
Solution Approach 2:
The patent applies self-service by enabling the control circuit to automatically adjust the gate voltage based on detected temperature conditions without external intervention. The system self-regulates by using its own temperature detection capability to modulate the gate voltage, eliminating the need for complex external control systems or manual adjustment mechanisms. This self-adjusting capability maintains switching speed performance while keeping the overall device complexity manageable.
Data Source
AI summary
A switching element control circuit includes a third electrode voltage control part which controls a third electrode voltage; a temperature detection part which detects an operation temperature of the switching element; a memory part which stores an initial threshold voltage, an initial temperature when the initial threshold voltage is measured, and a temperature characteristic of a threshold voltage; and a threshold voltage calculation part which calculates a threshold voltage at the time of operating the switching element based on information including the operation temperature of the switching element, the initial threshold voltage, and an initial temperature when the initial threshold voltage is measured, and information relating to a temperature characteristic of a threshold voltage, wherein the third electrode voltage control part controls the third electrode voltage based on a threshold voltage at the time of operating the switching element calculated by the threshold voltage calculation part.