Power Supply Apparatus Voltage Amplification via Inductor Resonance
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Solution Overview
Problem
Existing high-voltage power supply systems, such as those using the Cockcroft-Walton circuit, face limitations in increasing maximum output voltage without significant cost and size increases, as well as inefficiencies in voltage amplification and noise interference.
Innovation Solution
A power supply apparatus that includes an inductor, a switching element, and a boost converter circuit with rectification units comprising diodes and capacitors, where a diode is inserted between the DC voltage source and the inductor to increase voltage at one end, forming a series resonant circuit with the inductor and capacitors to enhance voltage amplification and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of stages of the multistage rectification circuit is increased to increase the maximum output voltage, then the maximum output voltage is improved, but the cost and area of the circuit are increased
Solution Approach 1:
The patent changes the operating parameters of the existing circuit by extending the ON time of the FET and increasing the L value of the inductor. This modifies the self-induced electromotive force generated after the FET is turned off, thereby increasing the final voltage without adding more circuit stages. The parameter changes allow voltage amplification while maintaining the same circuit configuration.
Solution Approach 2:
The patent utilizes periodic switching action of the FET to generate AC voltage from DC input. By controlling the periodic on-off switching and extending the ON time, the circuit generates sufficient self-induced electromotive force to achieve higher output voltage through the existing multistage rectification circuit, avoiding the need to increase the number of stages.
2Power
If the ON time of the FET is extended to increase the self-induced electromotive force, then the output voltage is increased, but the current taken from the power source is increased which limits the power source supply capacity and increases conduction noise
Solution Approach 1:
The patent introduces an inductor as an intermediary element between the power source and the multistage rectification circuit. The inductor with increased L value stores energy during the FET ON period and releases it as self-induced electromotive force when the FET turns off. This intermediary action allows voltage amplification while filtering the current drawn from the power source, thereby reducing conduction noise.
3Power
If the L value of the inductor is increased to increase the self-induced electromotive force, then the output voltage is increased, but the number of windings of the inductor is increased which increases the size and cost of components
Solution Approach 1:
The patent makes the inductor serve multiple functions: it acts as both a current filtering element to reduce conduction noise and as an energy storage element to generate self-induced electromotive force for voltage amplification. By optimizing the inductor's L value, the circuit achieves voltage increase without requiring excessive windings, thus controlling the size and cost while maintaining multi-functionality.
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 a higher maximum output voltage with a simple and cost-effective design, improving voltage amplification and reducing noise interference, while maintaining efficient operation.
Implementation Method 1
a self-induced electromotive force generated after the FET is turned off becomes larger
Implementation Method 2
each of the plurality of rectification units including a diode and a capacitor
Implementation Method 3
each of the plurality of rectification units including a diode and a capacitor
Data Source
AI summary
The power supply apparatus includes an inductor; a switching element connected to another end of the inductor, the switching element configured to drive the inductor by being turned on or turned off in accordance with an input pulse signal; a boost converter circuit connected to both ends of the inductor and including a plurality of rectification units, the boost converter circuit configured to amplify a voltage generated in the inductor, each of the plurality of rectification units including a diode and a capacitor; and a voltage boosting element configured to supply a voltage obtained by boosting an input voltage to the inductor.