Integrated Snubber Layout for Multi-Switch Semiconductor Modules
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Solution Overview
Problem
Conventional semiconductor devices with multiple switching elements face an increase in circuit board size due to the need for snubber circuits to reduce surge voltage, which can damage the elements.
Innovation Solution
A semiconductor device design that incorporates a support member with wiring sections, switching elements, passive elements such as capacitors or resistors, and an electrical conductor to form a snubber circuit within the device itself, eliminating the need for external snubber circuits on the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If snubber circuits are formed on the circuit board to reduce surge voltage, then the surge voltage is reduced, but the circuit board size increases
Solution Approach 1:
The patent merges the snubber circuit with the semiconductor device by integrating passive elements (capacitors and resistors) directly into the device structure. The capacitor is formed using electrode patterns on the same substrate as the switching elements, and the resistor is formed using the same wiring patterns, eliminating the need for separate external snubber circuits on the circuit board.
Solution Approach 2:
The snubber circuit components are nested within the semiconductor device structure. The capacitor electrodes are embedded in the substrate between switching elements, and the resistor wiring is integrated into the existing device interconnections, allowing the snubber functionality to be contained within the device footprint rather than requiring additional circuit board space.
2Productivity
If switching elements are driven at higher speed or with larger current, then productivity is improved, but surge voltage increases which may destroy the switching elements
Solution Approach 1:
The patent implements preliminary protective action by pre-positioning capacitor electrodes and resistor wiring in strategic locations within the device structure. The capacitor is placed between the switching element drain and source terminals, and the resistor is positioned in series with the switching element, so that surge voltage suppression is automatically activated when the switching elements operate at high speed or high current, protecting them before damage can occur.
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 reduces surge voltage while preventing an increase in circuit board size, enhancing dielectric breakdown voltage and allowing for efficient heat dissipation, thus protecting the switching elements.
Implementation Method 1
at least one of the first passive element and the second passive element is a capacitor
Implementation Method 2
an electrical insulator that is thermally conductive and located between the first passive element and the second passive element
Data Source
AI summary
A semiconductor device includes a support member, a first switching element, a second switching element, a first passive element, a second passive element, and an electrical conductor. The support member includes a plurality of wiring parts, and the plurality of wiring parts include a first wiring section and a second wiring section spaced apart from each other in a first direction perpendicular to the thickness direction of the support member. The first switching element is electrically connected to the first wiring section. The second switching element is electrically connected to the first switching element and the second wiring section. The first passive element has a first electrode and a second electrode, and the first electrode is bonded to the first wiring section. The second passive element has a third electrode and a fourth electrode, and the fourth electrode is bonded to the second wiring section. The electrical conductor connects the second electrode and the third electrode to each other. At least one of the first passive element and the second passive element is a capacitor.