Switching Element Drive Control Using Shared Temperature Thresholds
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Solution Overview
Problem
Existing switching element driving methods require multiple driving circuits to adjust the switching speed of each semiconductor element, leading to increased device size and complexity.
Innovation Solution
A method that detects the temperatures of multiple switching elements, calculates a switching determination temperature, and adjusts the switching speeds of all elements based on this temperature, using a single driving circuit to set the switching speed for all elements, thereby preventing an increase in device size and simplifying the circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If individual driving circuits are provided for each switching element to adjust switching speed, then switching loss is reduced, but device size increases
Solution Approach 1:
Multiple individual driving circuits are merged into a single driving circuit that can control multiple switching elements. The driving circuit includes a temperature detection unit that detects temperatures of multiple switching elements, a determination unit that determines a switching speed based on the detected temperatures, and a control unit that controls the switching speed of all switching elements based on the determined switching speed, thereby reducing device size while maintaining switching loss reduction benefits
Solution Approach 2:
A single driving circuit is designed to perform multiple functions: detecting temperatures of multiple switching elements, determining appropriate switching speeds based on those temperatures, and controlling the switching speed of all switching elements. This multi-functional approach eliminates the need for separate driving circuits for each switching element
Data Source
AI summary
A switching element driving method executed in a switching element driving device including a plurality of switching elements and a driving circuit configured to drive the plurality of switching elements, the switching element driving method including: detecting temperatures of the plurality of switching elements; calculating a switching determination temperature that serves as a reference for changing switching speeds of the switching elements from the plurality of detected temperatures; and changing the switching speeds of all the switching elements based on the switching determination temperature.