Isolated Gate Signal Transmission with Ground Open Detection
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Solution Overview
Problem
Conventional signal transmission devices lack effective detection mechanisms for ground open faults in secondary circuit systems, which can lead to operational issues.
Innovation Solution
A signal transmission device is designed with a first external terminal connected to the ground terminal of the secondary circuit system, a second external terminal with varying terminal voltage based on the first's state, and an open detection circuit to monitor this voltage for ground open faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional signal transmission devices are used to transmit signals between primary and secondary circuit systems with electrical isolation, then signal transmission function is achieved, but ground open fault detection capability is insufficient
Solution Approach 1:
The patent introduces a second external terminal as an intermediary element that indirectly indicates the ground connection status. This terminal's voltage varies according to whether the first external terminal is open, allowing fault detection without direct monitoring of the ground connection itself. This mediator approach enables reliable fault detection while avoiding the complexity of direct ground monitoring circuits.
2Reliability
If a detection mechanism is added to detect ground open faults, then reliability is improved, but device complexity increases
Solution Approach 1:
The open detection circuit monitors the terminal voltage at the second external terminal and uses this feedback information to detect the open state of the first external terminal. This feedback mechanism provides reliable fault detection by continuously monitoring the voltage state and comparing it against expected values, enabling the system to respond to ground open faults without requiring complex additional hardware.
Data Source
AI summary
A signal transmission device transmits a driving signal for a gate-driving transistor between a primary circuit system and a secondary circuit system while isolating between the primary and secondary circuit systems. The signal transmission device includes: a first external terminal configured such that the ground terminal of the secondary circuit system is connected to it; a second external terminal configured such that the terminal voltage at it varies according to whether the first external terminal is in an open state; and an open detection circuit configured to monitor the terminal voltage at the second external terminal to perform open detection for the first external terminal.