Resonant Power Source Circuit for Transformerless Capacitive Loads
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Solution Overview
Problem
Existing power source devices struggle to sufficiently increase the quality factor of the resonance circuit, limiting the generation of high voltage for driving capacitive loads without using transformers.
Innovation Solution
The power source device includes a series circuit of a first inductor and a first capacitor connected to an AC power source, with a series circuit of a load inductor and a capacitive load connected in parallel. This configuration allows for the adjustment of inductance and capacitance to satisfy specific frequency conditions, enabling the free design of the quality factor and boost ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple series inductor configuration is used to drive capacitive load, then the circuit is simple, but the quality factor of the resonance circuit cannot be sufficiently increased
Solution Approach 1:
The patent divides the single inductor into two separate inductors (first inductor Lp and load inductor Ls) that can be independently designed and adjusted. This segmentation allows each inductor to serve specific functions: Lp forms a resonance circuit with capacitor Cp to provide voltage boost, while Ls forms a resonance circuit with the capacitive load Cs. This independent adjustability enables sufficient increase in quality factor while maintaining reasonable circuit complexity.
Solution Approach 2:
The patent introduces a parallel circuit configuration dimension by connecting the series circuit of Lp and Cp in parallel with the series circuit of Ls and Cs. This parallel-serial hybrid structure creates multiple resonance paths, allowing the system to achieve high quality factor through resonant voltage amplification in both branches simultaneously, thus resolving the contradiction between simplicity and performance.
2Reliability
If transformer is used to generate high voltage, then voltage transformation is reliable, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates the transformer component from the system by replacing it with a resonant circuit-based voltage amplification mechanism. The series resonance circuit formed by Lp and Cp generates high voltage through resonant amplification of the input voltage, achieving the same voltage transformation function as a transformer but without the physical transformer device, thus reducing device complexity while maintaining reliability.
Solution Approach 2:
The patent substitutes the electromagnetic induction mechanism of the transformer with a resonant oscillation mechanism. Instead of using mutual induction between primary and secondary windings, the system uses the resonant oscillation of the LC circuit (Lp-Cp-Ls-Cs) to achieve voltage amplification. This substitution replaces the mechanical/electromagnetic transformer structure with a circuit-based resonant system, reducing device complexity.
3Stability of the object's composition
If inductor and capacitor values are fixed according to design, then the circuit is stable, but the quality factor cannot be freely adjusted
Solution Approach 1:
The patent introduces dynamic adjustability by making the inductor values (Lp and Ls) and capacitor values (Cp and Cs) independently variable parameters. The design allows each inductor and capacitor to be adjusted within specific ranges (0.8-1.2 times the resonant value) to optimize the quality factor while maintaining circuit stability. This dynamic parameter adjustment capability resolves the contradiction between fixed circuit constants and adjustable quality factor.
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 configuration allows for the free design of the quality factor and boost ratio, enabling the generation of high voltage for driving capacitive loads without using transformers, and also allows for the generation of high current for driving inductive loads.
Implementation Method 1
a resonance frequency of the first inductor and the first capacitor, a resonance frequency of a second inductor and a second capacitor, . . . , a resonance frequency of the load inductor and the capacitive load match each other, and a frequency of the AC power source matches each of the resonance frequencies
Data Source
AI summary
A power source device includes a capacitive load; and an AC power source, as a voltage source, which applies AC voltage to the capacitive load. A series circuit composed of an inductor and a capacitor is connected to the AC power source. A series circuit composed of a load inductor and the capacitive load is connected in parallel to one of the inductor or the capacitor. If an inductance of the inductor is defined as Lp, a capacitance of the capacitor is defined as Cp, an inductance of the load inductor is defined as Ls, an equivalent capacitance of the capacitive load is defined as Cs, and a frequency of the AC power source is defined as fv, the following expressions are satisfied,0.8/((2π·fv){circumflex over ( )}2)<Lp·Cp<1.2/((2π·fv){circumflex over ( )}2)0.8/((2π·fv){circumflex over ( )}2)<Ls·Cs<1.2/((2π·fv){circumflex over ( )}2).