Raised MOSFET Gate Pin Interface for PCB Isolation
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Solution Overview
Problem
Standard MOSFET surface mount packages face difficulties in connecting the gate pin to a copper plate or bar in high current applications, as the gate pin is in the same plane as the power pins, making electrical isolation and connection challenging, especially when mounting on printed circuit boards in harsh environments.
Innovation Solution
The MOSFET features a raised or elevated gate pin, which is physically and electrically isolated from copper plates or bars, connected via a wire to the battery management system's controller IC, with additional stabilization using materials like RTV Silicone for shock and vibration resistance, and a separate gate printed circuit board for mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gate pin is in the same plane as the power pins in standard MOSFET surface mount packages, then the device structure is simple and manufacturing is easier, but electrical isolation and connection of the gate pin to the controller IC becomes difficult when mounting on copper plates or bars
Solution Approach 1:
The gate pin is extended in the vertical dimension (perpendicular to the plane of the power pins) to create spatial separation. This dimensional change allows the gate pin to be electrically isolated from the copper plate while still being mounted on the same substrate, resolving the contradiction between simple manufacturing and ease of connection/isolation
2Reliability
If the gate pin is raised or elevated to provide physical and electrical isolation from copper plates, then electrical isolation and connection reliability improve, but the device structure becomes more complex
Solution Approach 1:
The gate pin is segmented from the power pins by extending it in a different direction (vertically upward), creating spatial separation. This segmentation allows independent connection of the gate pin to the controller IC while maintaining simple mounting of the power pins on the copper plate, achieving reliable electrical isolation without excessive complexity
Data Source
AI summary
Provided is a MOSFET device for use with a printed circuit board (PCB) of a battery management system (BMS), the device including a semiconductor body; a metal conductor extending outwardly from a side of the semiconductor body; a plurality of power pins extending outwardly from at least one side of the semiconductor body, the power pins having tips bent downwardly; a gate pin extending outwardly from at least one side of the semiconductor body, wherein the tip of the gate pin is raised or elevated relative to the tips of the power pins so as to avoid electrical contact with the one of the spaced apart copper plates, and wherein the tip of the gate pin is connected to a circuit of the battery management system (BMS).