Parallel MOSFET Gate Wiring With Ferrite Beads for Signal Integrity
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Solution Overview
Problem
Conventional semiconductor devices with power semiconductor elements face challenges in efficiently managing the current-carrying capacity and signal transmission due to limitations in parallel connections and impedance management of MOSFETs and IGBTs.
Innovation Solution
The semiconductor device employs a configuration where MOSFETs and IGBTs are connected in parallel, with impedance management through ferrite beads and conductive members to optimize signal transmission and frequency bands, supported by a conductive and insulating structure for enhanced current handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple power semiconductor elements are connected in parallel to increase current-carrying capacity, then the current handling capability is improved, but the impedance management and signal transmission quality deteriorate
Solution Approach 1:
Ferrite beads are introduced as intermediary components in the signal transmission paths to multiple semiconductor elements. These ferrite beads act as impedance matching devices that mediate between the signal source and the parallel-connected semiconductor elements, preventing signal degradation while allowing the parallel configuration to maintain its current-carrying capacity advantage.
Solution Approach 2:
The patent applies different impedance management strategies to different signal paths based on their specific requirements. Ferrite beads are selectively placed in certain signal transmission paths where impedance matching is critical, while other paths may use different configurations. This localized optimization maintains signal quality without unnecessarily complicating the overall structure.
2Reliability
If complex impedance management structures are added to maintain signal integrity in parallel connections, then signal transmission quality is improved, but device complexity increases
Solution Approach 1:
Ferrite beads serve as simple intermediary components that provide impedance matching functionality without requiring complex circuitry. By placing these passive components directly in the signal paths, the patent achieves signal integrity improvement with minimal increase in device complexity, avoiding the need for active impedance control circuits or complex matching networks.
Solution Approach 2:
The ferrite beads modify the impedance parameters of the signal transmission paths by introducing frequency-dependent inductance and resistance. This parameter change allows for better impedance matching across a range of frequencies, improving signal transmission quality without requiring complex adaptive impedance control mechanisms.
Data Source
AI summary
A semiconductor device includes first semiconductor elements, a control terminal, a first conductive member, and first circuit components. The first semiconductor elements are connected in parallel, and a switching operation of each first semiconductor element is controlled according to a first drive signal inputted to a third electrode of each first semiconductor element. The first conductive member is electrically connected to the control terminal to which the first drive signal is inputted, and is electrically interposed between the third electrodes. The first conductive member includes connecting members and a portion of a signal wiring section. Each of the first circuit components increases an impedance in a first frequency band. The first frequency band includes a resonance frequency of a resonance circuit that is formed by including a parasitic inductance of the first conductive member. The third electrodes of the first semiconductor elements are electrically connected to each other via at least one of the first circuit components.