Isolated Gate Driver Using Transformer Current Feedback for Fault Detection
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Solution Overview
Problem
Existing electronic systems with magnetic coupling structures lack effective mechanisms to detect and respond to errors in power transmission, leading to potential faults and inefficiencies in load operation.
Innovation Solution
A system comprising a power switch, controller, and magnetically coupled structure with first and second control interfaces that detect electrical current thresholds and errors, allowing for remedial actions such as adjusting current levels to prevent faults by communicating through fault signals across the transformer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a magnetic coupling structure is used to transfer power and control signals, then power transmission efficiency is improved, but the ability to detect and respond to errors in power transmission deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the second control interface monitors operational conditions of the power switch and communicates error information back to the first control interface through the magnetic coupling structure. This feedback loop enables the system to detect and respond to errors while maintaining efficient power transmission through the transformer.
Solution Approach 2:
The magnetic coupling structure serves as an intermediary that not only transfers power efficiently but also carries error information between control interfaces. By encoding error signals in the magnetic field, the transformer acts as a mediator that enables bidirectional communication without direct electrical connection, thus maintaining power transmission efficiency while adding error detection capability.
2Reliability
If error detection mechanisms are added to the magnetic coupling structure, then fault tolerance is improved, but device complexity increases
Solution Approach 1:
The control interfaces are designed to perform multiple functions: they control power switch operation, monitor operational conditions, detect errors, and communicate fault information. By making the control interfaces universal and multi-functional, the patent reduces the need for separate dedicated error detection components, thus improving fault tolerance while minimizing the increase in device complexity.
Solution Approach 2:
The patent combines error detection and communication functions with the existing power transmission magnetic coupling structure. Instead of adding separate error detection hardware, the error detection circuitry is integrated into the control interfaces that already exist for power switch control, merging multiple functions into existing components and thereby reducing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively detects and responds to errors in power transmission, ensuring stable operation of loads by adjusting current levels and preventing faults, enhancing fault tolerance and efficiency.
Implementation Method 1
a transformer having a primary winding and a secondary winding
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A system, comprising: a power switch; a controller; a transformer having a primary winding and a secondary winding; a first control interface that is coupled between the controller and the primary winding, the first control interface being arranged to: (i) detect an electrical current through the primary winding and (ii) output a fault signal to the controller in response to detecting that the electrical current through the primary winding has crossed a threshold; and a second control interface that is coupled between the secondary winding and the power switch, the second control interface being configured to: (i) provide an electrical current received from the transformer to the power switch, (ii) detect whether an error is present in the operational conditions of the power switch, and (iii) in response to detecting the error, change a level of an electrical current through the secondary winding.