Semiconductor Protection Circuit for Overcurrent and Load Open Detection
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Solution Overview
Problem
Semiconductor power switch circuits lack a simultaneous overcurrent protection and load open sensing function during operation, leading to potential device damage from overcurrent and incorrect operation when a load is open.
Innovation Solution
A protection circuit and gate driving circuit that include an overcurrent determining unit, load open determining unit, and error detection unit to generate a fault signal when overcurrent and load open conditions are detected during the turned-on level of the semiconductor switching device, with a protection control unit stopping the gate driving operation based on this signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simple protection circuit is used, then device complexity is reduced, but simultaneous overcurrent protection and load open sensing cannot be performed
Solution Approach 1:
The patent merges overcurrent determination and load open sensing into a single integrated circuit structure, avoiding the need for separate independent protection circuits. The shared detection units and error detection logic reduce overall device complexity while maintaining the capability to perform both functions simultaneously during switching device operation.
2Reliability
If separate protection circuits are used for overcurrent and load open detection, then each function is specialized, but device complexity and circuit size increase
Solution Approach 1:
The patent combines what could be separate specialized circuits into a single integrated protection circuit. The overcurrent determining unit and load open determining unit share common detection mechanisms and error detection logic, achieving function specialization within an integrated structure rather than through separate independent circuits. This approach maintains functional specialization while reducing overall circuit complexity.
Data Source
AI summary
There are provided a protection circuit and a gate driving circuit for a semiconductor switching device. The protection circuit for a semiconductor switching device includes an overcurrent determining unit operated according to a gate signal to determine whether a load current flowing through the semiconductor switching device controlling the load current is an overcurrent, a load open determining unit determining whether a load is open, on the basis of a detection value from a current detection unit detecting the load current, and an error detection unit generating a fault signal when it is determined that the overcurrent flows and the load is open, while the gate signal is in a turned on level of the semiconductor switching device.