Semiconductor Driving Device Negative Surge Detection Circuit
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Solution Overview
Problem
Semiconductor driving devices experience negative surges that cause malfunctions due to the adverse effects of VS negative surges, particularly in level shifter circuits with D latch circuits, which are not effectively suppressed by existing techniques.
Innovation Solution
Incorporating a negative surge detection circuit that compares the VS potential with the VB potential to detect surges and maintain a stable driving voltage in the level shifter circuit, ensuring the D latch circuit operates correctly even during negative surges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If an always-on level shifter circuit including a D latch circuit is used, then the circuit can operate continuously without switching, but negative surges occur causing malfunctions and adverse effects
Solution Approach 1:
A negative surge detection circuit is introduced as an intermediary component that monitors the VS potential and triggers a switching operation when a negative surge is detected. This mediator enables the always-on D latch circuit to respond to abnormal conditions, preventing malfunctions while maintaining continuous operation capability during normal conditions.
Solution Approach 2:
The negative surge detection circuit performs preliminary detection of potential surges by monitoring the VS potential before they can cause damage. By detecting the surge condition in advance and triggering the switching operation proactively, the circuit prevents the adverse effects of negative surges before they can manifest as malfunctions.
2Reliability
If conventional level shifter circuits (one-shot driving circuit, SR-FF latch circuit, D-FF latch circuit) are used, then negative surges can be suppressed to some extent, but the circuit complexity increases and the always-on capability is lost
Solution Approach 1:
The invention extracts only the essential negative surge detection and response functionality from complex conventional circuits. By using a simple always-on D latch circuit combined with a minimal negative surge detection circuit that monitors VS potential, the solution achieves effective surge suppression without the complexity of one-shot driving circuits or SR-FF latch circuits.
Solution Approach 2:
The invention changes the operational parameter of the level shifter circuit from switching-based operation to always-on operation with potential-based surge detection. By monitoring the VS potential parameter and triggering switching only when negative surges are detected, the circuit achieves surge suppression with minimal complexity and maintains continuous operation capability.
Data Source
AI summary
A semiconductor driving device includes a negative surge detection circuit and a level shifter circuit. The negative surge detection circuit detects whether the negative surge occurs at a connection point between a P-side SW element and N-side SW element. The level shifter circuit maintains a driving voltage used in driving the P-side SW element upon the negative surge detection circuit detecting occurrence of the negative surge.