Power Semiconductor Module Gate Filter for Oscillation Control
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Solution Overview
Problem
The existing power semiconductor modules face challenges in suppressing gate oscillation while maintaining switching speed, as the filters used to mitigate gate oscillation increase input capacitance, leading to longer charging/discharging times and increased manufacturing complexity due to varying filter requirements.
Innovation Solution
A power semiconductor module design that includes a capacitor forming a low-pass filter between the gate and source electrodes, with a wire connecting the filter arrangement patterns, allowing for easy adjustment of the filter's performance by modifying the wire's length and diameter, and enabling the filter to be easily connected or disconnected from the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is formed by connecting a capacitor between gate and source to suppress gate oscillation, then gate oscillation is suppressed, but input capacitance increases leading to decreased switching speed
Solution Approach 1:
The patent introduces a switching element that dynamically controls the connection between the capacitor and the gate-source circuit. The capacitor is only connected to suppress gate oscillation when needed, and disconnected when switching speed is prioritized, making the filter configuration adjustable rather than fixed
Solution Approach 2:
The patent enables changing the capacitance value by selecting different capacitors or connecting capacitors in parallel/series configurations. This allows optimization of the filter performance to achieve the right balance between gate oscillation suppression and switching speed for different application requirements
2Reliability
If different filter configurations are implemented for different product types to optimize performance or switching speed, then performance is optimized, but manufacturing process becomes complicated increasing manufacturing cost
Solution Approach 1:
The patent designs a universal module structure that can accommodate different filter configurations through optional components and adjustable connections. The same basic module can be configured with or without filters, with different capacitance values, making it versatile for different product types without requiring separate manufacturing processes
Solution Approach 2:
The patent separates the filter components (capacitor, switching element, control circuit) as distinct, independently controllable modules. This segmentation allows the filter to be selectively activated or deactivated, and its parameters adjusted, without affecting the core power conversion functionality, simplifying manufacturing by using a standardized base module
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
This design effectively suppresses gate oscillation while allowing for adjustable filter performance to prioritize switching speed, simplifying the manufacturing process and reducing costs by allowing for flexible filter configuration without altering the manufacturing process for each module.
Implementation Method 1
a filter forming element 17 to form a low-pass filter
Implementation Method 2
the parasitic capacitance of the semiconductor switching elements and the parasitic inductance between the semiconductor switching elements may cause gate oscillation or noise to occur
Data Source
AI summary
A power semiconductor module includes a semiconductor switching element, a gate control pattern to which a gate electrode of the semiconductor switching element is connected, a source control pattern to which a source electrode of the semiconductor switching element is connected, a capacitor to form a low-pass filter, a capacitor arrangement pattern to which one end of the capacitor is connected, and a wire. The other end of the capacitor is connected to the source control pattern. The wire electrically connects the capacitor arrangement pattern and the gate control pattern.