Electromagnetic Vacuum Capacitor Switching for Rapid Impedance Matching
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Solution Overview
Problem
Traditional variable ceramic vacuum capacitors have limited capacitance value adjusting speed and time due to mechanical constraints and pressure differences, which hinder their application in high-frequency and high-voltage devices requiring rapid impedance matching.
Innovation Solution
A capacitance value fast-placing vacuum capacitor is designed with an electromagnetic drive mechanism that includes an iron core, coil winding, and magnetic conductive plate, allowing for rapid shifting of the first electrode group relative to the second electrode group, thereby changing the capacitance values within a short time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a thread system with rotating screw rod is used to adjust capacitance value, then the capacitor can achieve variable capacitance through mechanical rotation, but the adjusting speed is limited to 600 rpm and adjusting time is 3 to 6 seconds
Solution Approach 1:
The patent replaces the traditional mechanical thread system with an electromagnetic drive mechanism. The electromagnetic mechanism uses a magnetic conductive plate coupled with an electromagnetic coil to directly drive the moving electrode group, eliminating the need for screw rods and mechanical threading. This substitution enables much faster response times and higher adjusting speeds while reducing mechanical complexity and friction losses.
Solution Approach 2:
The patent introduces dynamic control of the electromagnetic coil to achieve rapid positioning of the moving electrode group. By controlling the electromagnetic field dynamically, the system can quickly adjust the capacitance value between maximum and minimum positions without the inertia and friction constraints of mechanical thread systems, achieving adjusting times significantly shorter than the traditional 3-6 seconds.
2Strength
If the torque of the rotating screw rod is greater than 0.1 N·m due to pressure difference, then the vacuum capacitor maintains structural stability, but the rotating speed of the screw rod cannot be improved under fixed motor torque
Solution Approach 1:
The electromagnetic drive mechanism eliminates the screw rod entirely, replacing the mechanical transmission system with a direct electromagnetic actuation system. The magnetic conductive plate is directly coupled to the moving electrode group, allowing the electromagnetic coil to exert force directly on the moving mass without mechanical intermediaries. This eliminates the torque-speed tradeoff inherent in threaded mechanical systems.
Solution Approach 2:
The patent extracts and removes the screw rod and thread mechanism from the system, keeping only the essential function of moving the electrode group. By taking out the mechanical transmission elements, the system avoids their inherent limitations regarding torque and speed, achieving both structural stability and high-speed adjustment capabilities.
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 achieves a capacitance value change time of within one hundred milliseconds, significantly improving the adjusting speed and meeting the requirements of high-frequency and high-voltage applications for rapid impedance matching.
Implementation Method 1
an electromagnetic drive mechanism is mounted on the outer side of one end of the housing. The electromagnetic drive mechanism is capable of driving the first electrode group to shift relative to the second electrode group
Implementation Method 2
a magnetic conductive plate is fixedly connected to the first electrode group. When the electromagnetic drive mechanism is energized, an attraction force can be generated on the magnetic conductive plate
Data Source
AI summary
A capacitance value fast-placing vacuum capacitor includes: a housing, a first electrode group and a second electrode group. A vacuum chamber is provided in the housing. The first electrode group and the second electrode group are mutually coupled and accommodated in the vacuum chamber. An electromagnetic drive mechanism is mounted on the outer side of one end of the housing. The electromagnetic drive mechanism is capable of driving the first electrode group to shift relative to the second electrode group, the vacuum capacitor is switched between two capacitance value states. In the capacitance value rapid-switching vacuum capacitor, the electromagnetic drive mechanism is configured for rapidly adjusting and switching capacitance values of the vacuum capacitor, the capacitance value switching time of the vacuum capacitor is within one hundred milliseconds, thus meeting the requirement of an application device of the vacuum capacitor for rapid matching of an impedance matcher.