Semiconductor Drive Protection Circuits Using Pulse-Width Fault Identification
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Solution Overview
Problem
Existing semiconductor element drive devices face issues with accurately identifying which protection circuit is in a protection operation condition due to false detection of alarm signals and complex signal configurations, leading to errors in anomaly identification.
Innovation Solution
A semiconductor element drive device with plural protection circuits that output pulse signals with differing pulse widths, allowing for accurate identification of the protection circuit in operation through a notification signal output circuit using a NAND gate and RS type flip-flop circuit, which outputs a protection operation notification signal corresponding to the pulse width of the detected anomaly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple protection circuits output alarm signals simultaneously, then comprehensive protection coverage is achieved, but false detection and inaccurate anomaly identification occur
Solution Approach 1:
The alarm signal output circuit segments the simultaneous alarm signals by assigning different pulse widths to different protection circuits. Each protection circuit's alarm signal is given a unique pulse width characteristic, allowing the notification signal output circuit to identify which specific protection circuit detected the anomaly based on pulse width measurement, thereby eliminating false detection while maintaining comprehensive protection coverage.
2Measurement precision
If complex signal configurations are used to identify protection circuit status, then accurate anomaly identification is achieved, but device complexity increases
Solution Approach 1:
The invention changes the parameter of pulse width to encode protection circuit identification information. Instead of using complex signal configurations with multiple wires or communication protocols, each protection circuit outputs an alarm signal with a specific pulse width that corresponds to its identity. The notification signal output circuit simply measures the pulse width to determine which protection circuit triggered the alarm, achieving accurate anomaly identification with minimal device complexity.
3Measurement precision
If pulse width differentiation is implemented for protection circuits, then accurate anomaly identification is achieved, but signal formation complexity increases
Solution Approach 1:
The invention merges the protection circuit identification function with the alarm signal output function. The alarm signal output circuit combines multiple protection circuit inputs and automatically assigns appropriate pulse widths based on which protection circuit triggered the alarm. This merging eliminates the need for separate identification circuits, as the pulse width differentiation is inherently generated during the alarm signal formation process, achieving accurate protection circuit identification without additional signal formation complexity.
Data Source
AI summary
A semiconductor element drive device which individually drives semiconductor elements configuring a power converter includes plural protection circuits which detect information necessary for carrying out a protection operation for the semiconductor elements, an alarm signal output circuit which, having set therein pulse signals with pulse widths differing from one of the plural protection circuits to another, continuously outputs a pulse signal corresponding to a protection circuit, among the plural protection circuits, which has first detected that a protection operation is necessary, as an alarm signal during a period in which it is detected that the protection operation is necessary, and a notification signal output circuit which, when the alarm signal is output from the alarm signal output circuit, outputs one pulse thereof equivalent to the set pulse width as a protection operation notification signal.