Semiconductor Switch Drive Circuit for Abnormality Localization
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Solution Overview
Problem
In power supply devices with multiple semiconductor switches connected in series, existing control systems face challenges in simplifying the device configuration and accurately identifying the site and nature of abnormalities, as they require complex wiring and cannot distinguish between drive circuit and insulation circuit abnormalities.
Innovation Solution
A power supply device with an interface circuit and communication lines that sequentially transmit control signals and state detection signals, allowing the abnormality detection circuit to identify mismatches between control signals and operation states across semiconductor switches, thereby specifying the site and content of abnormalities without complicating the device configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate control circuits and drive circuits are provided for each semiconductor switch to detect abnormalities, then abnormality detection capability is improved, but device configuration becomes complicated
Solution Approach 1:
Multiple drive circuits are merged into a single drive circuit that can control multiple semiconductor switches. The drive circuit includes multiple abnormality detection circuits that share common components such as the control signal generation unit, optical insulation circuit, and communication lines, thereby reducing overall device complexity while maintaining abnormality detection capability for each switch.
Solution Approach 2:
The drive circuit is designed with multi-functionality to control multiple semiconductor switches (first through n-th switches) using a single circuit unit. The abnormality detection circuit can detect abnormalities in any of the controlled switches by receiving control signals and comparing them with actual operation states, making the drive circuit universal rather than dedicated to a single switch.
2Reliability
If abnormality detection compares drive signal with gate voltage state signal, then abnormality detection is enabled, but the site and content of abnormality cannot be specified
Solution Approach 1:
The abnormality detection function is segmented into multiple independent abnormality detection circuits, with each circuit responsible for detecting abnormalities in a specific semiconductor switch. Each detection circuit independently compares control signals with operation states and can identify the specific switch exhibiting abnormality, thereby preserving location information that would otherwise be lost in a centralized detection approach.
Solution Approach 2:
The system implements feedback by comparing control signals (which represent intended operations) with actual operation states (detected from gate voltages). When mismatches are detected, the abnormality detection circuit generates abnormality detection signals that provide feedback about the specific switch and nature of the abnormality, enabling precise identification of both location and content of failures.
3Extent of automation
If multiple communication lines are used to transmit control signals and state detection signals, then sequential transmission across multiple switches is enabled, but wiring complexity increases
Solution Approach 1:
Multiple communication functions are merged into a single communication line that sequentially transmits both control signals from the drive circuit to multiple switches and state detection signals from switches back to the drive circuit. This bidirectional sequential communication eliminates the need for separate dedicated lines for each direction and each switch, significantly reducing wiring complexity while maintaining automated control and monitoring.
Data Source
AI summary
A first communication line transmits a control signal from an I/F circuit to an n-th drive circuit. A second communication line transmits a state detection signal of semiconductor switches from the n-th drive circuit to the I/F circuit. An i-th drive circuit includes a driver for an i-th semiconductor switch, an abnormality detection circuit for detecting an abnormality of the i-th semiconductor switch, and first and second notification members. The abnormality detection circuit detects the abnormality of the i-th semiconductor switch and an operation state of the i-th semiconductor switch, and notifies a detection result using the first notification member. The abnormality detection circuit generates the state detection signal indicating an operation state of the i-th to n-th semiconductor switches, detects a mismatch between the control signal and the operation state of the i-th to n-th semiconductor switches, and notifies a detection result using the second notification member.