Solid-State Switch Timing for Multi-Mode Capacitor Insulation Testing
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Solution Overview
Problem
Existing testing devices for capacitive electric components can only generate Damped Alternating Current (DAC) voltages and lack the capability to produce other voltage types such as DC, Very Low Frequency (VLF), and square-wave voltages, limiting their versatility and effectiveness in insulation testing.
Innovation Solution
A testing device with a solid-state switch that can open during the LC resonant phase, comprising a thyristor element with an antiparallel thyristor or insulated gate bipolar transistor, and a process control unit capable of generating various voltage types, including DC, VLF, AC, and square-wave voltages, by controlling the timing of the switch's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional solid-state switch (thyristor with anti-parallel diode) is used in the DAC test system, then the switch can be closed during the LC resonant phase to maintain circuit continuity, but the device can only generate DAC voltages and lacks capability to produce other voltage types such as DC, VLF, and square-wave voltages
Solution Approach 1:
The solid-state switch control is made dynamic by enabling it to change state (open/close) during the LC resonant phase based on the desired voltage type. The switch can be opened at specific moments to generate different voltage waveforms (DC, VLF, square-wave) rather than remaining continuously closed, allowing the same hardware to produce multiple voltage types adaptively
Solution Approach 2:
The invention changes the operational parameters of the solid-state switch (timing, duration, sequence of opening/closing) to generate different voltage types. By modifying when the switch opens and closes during the resonant phase, the system can produce DC, VLF, AC, and square-wave voltages from the same LC circuit configuration
2Adaptability or versatility
If the solid-state switch remains closed during the whole LC resonant phase, then the circuit continuity is maintained for DAC generation, but the versatility of the device is limited and cannot generate other voltage types
Solution Approach 1:
The solid-state switch operates with periodic opening and closing actions during the LC resonant phase to generate different voltage types. Instead of remaining continuously closed, the switch opens and closes at controlled intervals to produce DC, VLF, AC, and square-wave voltages, maintaining circuit reliability through controlled periodic operation
Solution Approach 2:
The process control unit pre-determines the switching sequence before execution, planning when the solid-state switch should open and close to generate the desired voltage type. This preliminary control ensures that circuit continuity is maintained when needed while enabling versatility through pre-planned switching patterns
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
Enables the generation of multiple voltage types, enhancing the device's versatility and effectiveness in insulation testing of capacitive electric components by allowing for more comprehensive and flexible testing scenarios.
Implementation Method 1
an inductor and a capacitance of the capacitive electric component form an LC circuit, wherein the solid-state switch additionally can open when the LC circuit is charged with electrical energy
Data Source
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AI summary
A novel device for testing of insulation of capacitive electric components (26) having a metallic core and an outer insulation is described, which comprises a power supply (15), a solid-state switch (20) for short-circuiting the power supply (15) and an inductor (21), wherein the inductor (21) and the capacitance of the capacitive electric component (26) provide an LC circuit. The solid-state switch (20) is additionally designed for opening when the LC circuit is charged by electrical energy.