Electrostatic Contactless Power Supply Impedance Control
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Solution Overview
Problem
Existing contactless electric power supply systems for movable sections, such as those in board manufacturing equipment, face inefficiencies and increased costs due to complex configurations when using magnetic field resonance methods for impedance matching, especially over short distances, and struggle to maintain stability and efficiency as operating conditions change.
Innovation Solution
An electrostatic coupling type contactless electric power supply device with a high-frequency power source section, electrodes for power supply and reception, a series resonant circuit, voltage detection means, auxiliary voltage detection, and calculation control means to adjust output frequency and voltage based on load side impedance and resonance state, simplifying the circuit on the movable section and reducing weight and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If magnetic field resonance method is used for contactless electric power supply, then power supply distance is extended, but device complexity and cost increase due to excessive configuration for impedance matching
Solution Approach 1:
The patent changes the fundamental operating parameters by switching from magnetic field resonance to electrostatic coupling method, and from parallel resonant circuit to series resonant circuit. This parameter change enables effective power supply over short distances with simplified impedance matching requirements, reducing device complexity while maintaining power supply capability
Solution Approach 2:
The patent extracts and removes the excessive impedance matching components and complex control systems that are characteristic of magnetic field resonance methods. By using electrostatic coupling with series resonant circuit, the system eliminates unnecessary devices while retaining the essential power transfer function
2Measurement precision
If detection circuit and communication section are added to electric power receiving side, then operating condition detection capability is improved, but movable section weight and size increase
Solution Approach 1:
The patent inverts the conventional architecture by placing the detection circuit and communication section on the fixed section side instead of the movable section side. The fixed section detects operating conditions and communicates control signals to the movable section, achieving precise monitoring while keeping the movable section lightweight and simple
Solution Approach 2:
The patent introduces a communication section as an intermediary that transmits detection results and control signals between the fixed section and movable section. This intermediary enables the fixed section to monitor movable section operating conditions without requiring heavy detection equipment on the movable section itself
3Loss of energy
If series resonant circuit is used for electrostatic coupling method, then power supply efficiency is improved, but stability decreases when operating conditions change
Solution Approach 1:
The patent implements a feedback control system where the detection circuit monitors operating conditions and resonance state, communicates this information to the control section, and the control section adjusts the high-frequency power source output accordingly. This closed-loop feedback maintains both high efficiency and stability under varying operating conditions
Solution Approach 2:
The patent makes the power supply system dynamic by enabling variable adjustment of output frequency and voltage based on real-time operating conditions. The control section dynamically adapts the series resonant circuit operation to maintain optimal efficiency and stability as load conditions change
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
This solution enhances operational stability and power supply efficiency by detecting the operating condition and resonance state of the movable section, allowing for variable control of the high-frequency power source, thereby reducing equipment costs and complexity while maintaining high power transfer efficiency.
Implementation Method 1
electrostatic coupling methods using a capacitor configuration with opposing electrode plates
Implementation Method 2
series resonant circuits for the entire contactless electric power circuit
Data Source
Figure 1
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AI summary
An electrostatic coupling type contactless electric power supply device of this present invention comprising: an electrode for electric power supply and a high-frequency power source section provided on a fixed section, an electrode for electric power reception and a received electric power converting section provided on a movable section, and a resonance inductor forming a series resonant circuit, wherein it further comprises: a voltage detection means that detects the traveling wave voltage of the traveling wave from the high-frequency power source section to the series resonant circuit and in the reverse direction the reflected wave voltage of the reflected wave provided between the high-frequency power source section and the series resonant circuit, an auxiliary voltage detection means that detects in a contactless manner the received voltage generated at the electrode for electric power reception provided on the fixed section, and a calculation control means that calculates the load side impedance based on the traveling wave voltage and the reflected wave voltage, determines the resonance state based on the received voltage, and variably controls at least the output frequency or output voltage of the high-frequency power source section. From this, the operating stability of the current consumer on the movable section is higher while being able to simplify the electric circuit on the movable section side, and this can be smaller and lighter, which contributes to reducing the supplied electric power and lowering equipment costs.