Switching Element Drive Circuit With Shared High-Voltage Terminal
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Solution Overview
Problem
The existing drive circuits for switching elements, particularly in in-vehicle traction units, face challenges due to the increased number of high-voltage side terminals required for insulation communication, leading to redundancy and size issues when incorporating insulation means like photocouplers into integrated circuits.
Innovation Solution
A drive circuit design that shares a high-voltage side terminal between stabilization and guard processes, allowing for the miniaturization of the integrated circuit by reducing the number of high-voltage side terminals and optimizing the impedance control between the gate and the stabilization circuit, while maintaining effective insulation between high-voltage and low-voltage areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If insulation communication means such as photocoupler are incorporated into integrated circuit, then manufacturing compactness is improved, but device complexity increases due to redundant high-voltage side terminals
Solution Approach 1:
The patent makes the high-voltage side terminal serve multiple functions: it acts as both a signal input terminal for the stabilization circuit and a signal output terminal for the absolute value control circuit. This multi-functionality eliminates the need for separate dedicated terminals, reducing terminal redundancy and simplifying the overall terminal configuration while maintaining compact integration of insulation communication means
2Reliability
If high-voltage side terminals are increased for insulation communication, then insulation reliability is improved, but device complexity increases due to redundant terminal design
Solution Approach 1:
The high-voltage side terminal is designed to perform multiple functions simultaneously: receiving stabilization signals and outputting absolute value control signals. This eliminates the need for additional redundant terminals while maintaining insulation reliability through the integrated circuit's internal insulation structure, thereby reducing terminal design complexity without compromising reliability
3Measurement precision
If separate terminals are used for stabilization and absolute value control, then control precision is improved, but device complexity increases
Solution Approach 1:
The patent enables a single high-voltage side terminal to handle both stabilization control and absolute value control functions by implementing internal circuit switching mechanisms. The selection circuit selectively connects the terminal to either the stabilization circuit or the absolute value control circuit based on operational requirements, maintaining control precision while eliminating the need for separate physical terminals
Data Source
AI summary
A drive circuit is provided for a target switching element and opens/closes a current path by controlling an absolute value of a potential difference between one end of the current path and an opening/closing control terminal. The drive circuit includes an integrated circuit connected to the control terminal. The integrated circuit includes an absolute value control circuit controlling the absolute value of the potential difference when the switching element is in an off-state, a stabilization circuit stabilizing the potential difference at a value for maintaining the switching element in an off-state when the switching element is in an off-state, a selection circuit selecting one of control of the absolute value of the potential difference by the control circuit and stabilization of the potential difference by the stabilization circuit, and an on-state terminal connected to the control circuit and the control terminal. The on-state terminal is connected to the stabilization circuit.