Semiconductor Phase-Selection Circuit for Unified AC/DC Connector Testing
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Solution Overview
Problem
Current high-voltage and large-capacity connection switches, particularly in AC and DC circuit breakers, face challenges with complex control mechanisms, high failure rates, and poor repeatability due to mechanical contact switches, and the need for separate systems for AC and DC experiments leads to inefficient and costly experimental setups.
Innovation Solution
An experimental multifunctional power supply processing device integrating phase selection and rectification functions using high-power controllable semiconductor switch tubes, such as thyristors, to manage phase selection and rectification, reducing the complexity of experimental circuits and improving accuracy and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical contact switches are used for phase selection in AC and DC circuit breakers, then the switching function can be achieved, but the control complexity increases and reliability decreases due to numerous intermediate control devices and contact ablation
Solution Approach 1:
The patent replaces mechanical contact switches with semiconductor switching devices (IGBTs, MOSFETs, or BJTs) to eliminate mechanical contact ablation and reduce control complexity. The semiconductor devices are controlled by gate signals to achieve phase selection and current interruption functions, thereby improving reliability and reducing the number of intermediate control devices.
Solution Approach 2:
The patent designs a unified semiconductor switching device that can perform both AC phase selection and DC current interruption functions. The same switching device structure is used for both AC and DC experimental circuits, eliminating the need for separate mechanical switches for each function and reducing overall system complexity.
2Adaptability or versatility
If separate experimental systems are used for AC and DC circuit breaker experiments, then each experiment type can be conducted independently, but the equipment utilization rate decreases and experimental costs increase
Solution Approach 1:
The patent creates a unified experimental system where the same semiconductor switching device and circuit structure can perform both AC phase selection experiments and DC current interruption experiments. The switching device responds to gate signals regardless of whether the input is AC or DC, allowing one system to replace two separate systems and improve equipment utilization.
Solution Approach 2:
The patent employs dynamically controllable semiconductor switching devices that can adapt their operation mode based on the input signal type (AC or DC). The switching characteristics are controlled by gate signals with appropriate timing and amplitude, allowing the same hardware to dynamically switch between AC phase selection mode and DC current interruption mode.
3Ease of manufacture
If low-frequency AC experiments are used to simulate DC experiments, then high-voltage DC experimental equipment can be avoided, but the experimental equivalence becomes controversial and accuracy decreases
Solution Approach 1:
The patent changes the fundamental parameter of the experimental system by using real high-voltage DC power supply instead of low-frequency AC simulation. The semiconductor switching devices directly interrupt DC current with controlled gate signals, achieving true DC breaking capacity measurement rather than AC simulation, thereby improving experimental accuracy and equivalence.
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 solution enhances the accuracy and longevity of phase selection switches, integrates AC and DC experimental functions, reduces experimental costs, and improves equipment utilization by using semiconductor switch tubes for phase selection and rectification, providing a more reliable and efficient high-voltage, large-capacity experimental setup.
Implementation Method 1
the current valve control components in each electric control valve group are composed of controllable semiconductor switch tubes, so as to achieve a state where any one phase can be conducted or blocked
Data Source
AI summary
A power supply processing device includes three electric control valve groups, a positive output terminal and a conversion control switch group. The conversion control switch group includes a selection switch group configured to selectively connect the current valve control components in each electric control valve group to the positive output terminal or the phase output terminal, and a connection switch group configured to connect or disconnect a current path between two electric control valve groups connected one another. In such a way, both AC experiments and DC experiments of high voltage and large capacity may be performed to the connectors without changing experimental site and experimental equipment, thereby effectively reducing the experimental cost.