Semiconductor Device Integrating Resistor for Overvoltage Protection
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Solution Overview
Problem
Existing switching power supply devices require external components for overvoltage protection, increasing assembly time, part quantity, device size, and cost, while their overvoltage resistance is inadequate during standby states before switching operations.
Innovation Solution
A semiconductor device with a junction field effect transistor, dielectric, relay wiring, and a resistor element connected between the drain and relay wiring, providing overvoltage resistance and integrating the resistor element on the same semiconductor substrate as the JFETs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external components are used for overvoltage protection, then overvoltage resistance is improved, but device complexity and part quantity increase
Solution Approach 1:
The patent merges the overvoltage protection function with the existing starting circuit by integrating a resistor element directly into the semiconductor substrate. This combination eliminates the need for separate external protection components while maintaining overvoltage resistance, thereby reducing part quantity and device complexity
2Reliability
If external components are used for overvoltage protection, then overvoltage resistance is improved, but assembly time increases
Solution Approach 1:
The overvoltage protection function is merged into the starting circuit integrated on the semiconductor substrate, eliminating the need for separate assembly steps for external protection components. This integration directly reduces assembly time while maintaining overvoltage resistance
3Reliability
If external components are used for overvoltage protection, then overvoltage resistance is improved, but device size increases
Solution Approach 1:
The protection function is merged into the existing starting circuit layout on the semiconductor substrate, utilizing available space rather than adding external components. This approach maintains overvoltage resistance without increasing the overall device footprint
4Reliability
If external components are used for overvoltage protection, then overvoltage resistance is improved, but cost increases
Solution Approach 1:
The overvoltage protection function is merged into the starting circuit by adding a resistor element during the semiconductor manufacturing process. This integration eliminates the need for purchasing and mounting separate external protection components, thereby reducing overall device cost while maintaining overvoltage resistance
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
The solution reduces the number of external parts, decreases assembly and part costs, and enhances overvoltage resistance, including static electricity resistance in the control IC, while maintaining a compact device size.
Implementation Method 1
a first resistor element, connected between the drain of the junction field effect transistor and the relay wiring, provided inside the dielectric
Data Source
AI summary
A semiconductor device has a configuration wherein a resistor that restricts overvoltage is inserted between an input terminal and the drain of JFETs, and the resistor is disposed on the JFETs. Also, the resistor is formed contiguously and integrally with a spiral form high breakdown voltage high resistance element that configures a resistive voltage divider circuit.