Capacitor Switching Circuit for Variable Power Line Lengths
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Solution Overview
Problem
Existing power supply devices for contactless power supply facilities face challenges in adjusting capacitance to match varying power supply line lengths, leading to increased capacitor withstand voltage requirements and costs.
Innovation Solution
A power supply device with a circuit switching mechanism that switches between series and parallel connections of capacitors to adjust capacitance based on power supply line length, sharing terminal voltage across multiple capacitors to reduce voltage requirements and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the capacitance of the power supply circuit is reduced to match longer power supply lines, then the impedance matching is improved, but the withstand voltage requirement for capacitors increases
Solution Approach 1:
The power supply circuit is segmented into multiple capacitor units (first capacitor unit, second capacitor unit, etc.) that can be independently connected in series or parallel. This segmentation allows flexible adjustment of total capacitance and voltage distribution, enabling the circuit to adapt to different power supply line lengths without requiring excessive withstand voltage from individual capacitors.
Solution Approach 2:
The circuit employs switching elements (transistors, diodes, resistors) to dynamically reconfigure the capacitor connections between series and parallel arrangements based on the power supply line length. This dynamic reconfiguration optimizes both capacitance value and voltage distribution, resolving the contradiction between adaptability and withstand voltage requirements.
2Adaptability or versatility
If multiple capacitors are connected in parallel to increase capacitance for shorter power supply lines, then the impedance matching is improved, but the cost increases due to higher withstand voltage requirements
Solution Approach 1:
The use of multiple identical or similar capacitor units allows standardized manufacturing and procurement. Each capacitor unit operates at lower voltage stress, enabling the use of cheaper, lower-rated components while achieving the required total capacitance through parallel connection, thus reducing overall manufacturing cost.
Solution Approach 2:
The circuit changes the operational parameters (connection configuration) of existing capacitor units rather than requiring different capacitor specifications for different line lengths. This parameter change approach maintains component consistency and reduces manufacturing complexity and cost.
3Adaptability or versatility
If the capacitance is adjusted by changing the number of parallel capacitors, then the impedance matching is improved, but the circuit complexity increases
Solution Approach 1:
The circuit is divided into modular capacitor units with standardized switching control. Each unit can be independently configured, and the modular structure simplifies the control logic for capacitance adjustment, reducing overall circuit complexity despite the adaptability gained.
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 device effectively adjusts capacitance to match power supply line length while reducing capacitor voltage requirements and overall costs, ensuring efficient power transmission.
Implementation Method 1
the circuit switching mechanism is switchable between a series connection state, in which the first capacitor and the second capacitor are connected in series between the power supply unit and the output unit, and a parallel connection state, in which the first capacitor and the second capacitor are connected in parallel between the power supply unit and the output unit
Implementation Method 2
supplying alternating current to the power supply line... configured to supply power to the power receiving device in a contactless manner by supplying alternating current to the power supply line
Data Source
AI summary
A power supply device includes a power supply unit that outputs alternating current, an output unit connectable to a power supply line, and an adjusting unit that adjusts the capacitance of a power supply circuit between the power supply unit and the output unit. The adjusting unit includes a first capacitor, a second capacitor, and a circuit switching mechanism. The circuit switching mechanism can switch between a series connection state in which the first capacitor and the second capacitor are connected in series between the power supply unit and the output unit, and a parallel connection state in which the first capacitor and the second capacitor are connected in parallel between the power supply unit and the output unit.