Capacitor-Insulated Semiconductor Relay with Stable RC Oscillation
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Solution Overview
Problem
Conventional semiconductor relays experience unstable operation due to large current changes at input terminals, leading to instability in the RC oscillation circuit, especially when the power source has low current supply capability.
Innovation Solution
A capacitor-insulated semiconductor relay design featuring a charge pump booster circuit with high dielectric strength capacitors and a waveform regulation circuit that increases rise and fall times of input signals, reducing current changes and stabilizing the RC oscillation circuit for high-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the input current magnitude is increased to achieve high-speed operation, then the switching speed is improved, but the input voltage becomes unstable when the power source has low current supply capability
Solution Approach 1:
The waveform regulation circuit pre-regulates the input signal waveforms before they reach the RC oscillation circuit, increasing rise and fall times in advance. This preliminary action reduces the magnitude of input current changes before they occur, preventing voltage instability while maintaining the ability to achieve high-speed operation.
Solution Approach 2:
The waveform regulation circuit acts as an intermediary between the input signal and the RC oscillation circuit. It mediates the signal characteristics by increasing rise and fall times, thereby reducing current magnitude changes and protecting the RC oscillation circuit from voltage instability caused by large current variations.
2Speed
If the input current magnitude is increased to achieve high-speed operation, then the switching speed is improved, but the RC oscillation circuit operation becomes unstable
Solution Approach 1:
The waveform regulation circuit pre-regulates the input signal waveforms before they reach the RC oscillation circuit, increasing rise and fall times in advance. This preliminary action reduces the magnitude of input current changes before they occur, preventing voltage instability while maintaining the ability to achieve high-speed operation.
Solution Approach 2:
The waveform regulation circuit acts as an intermediary between the input signal and the RC oscillation circuit. It mediates the signal characteristics by increasing rise and fall times, thereby reducing current magnitude changes and protecting the RC oscillation circuit from voltage instability caused by large current variations.
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 enables stable and high-speed operation of the semiconductor relay by reducing input current changes, maintaining insulation between input and output, and allowing reliable operation even with low current supply power sources.
Implementation Method 1
The booster circuit is a charge pump circuit having a first high dielectric strength capacitor and a second high dielectric strength capacitor connected in parallel to each other
Implementation Method 2
capacitor-insulated semiconductor relay that maintains insulation between input and output in the semiconductor relay using capacitors
Data Source
AI summary
A capacitor-insulated semiconductor relay includes an RC oscillation circuit, a waveform regulation circuit, a booster circuit, a charging/discharging circuit, and an output circuit. The RC oscillation circuit generates first and second signals that are inverse in phase to each other. The waveform regulation circuit increases rise and fall times of the first signal, and rise and fall times of the second signal. Output signals from the waveform regulation circuit are respectively inputted to first and second high dielectric strength capacitors and that are provided in the booster circuit and connected in parallel to each other. The booster circuit receives the output signals from the waveform regulation circuit to generate a predetermined voltage. The output circuit is driven based on the predetermined voltage.