Power Conversion Transformer Circuit for Low-Ozone Plasma Fans
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Solution Overview
Problem
High-voltage direct current (HV DC) fans generate ozone and radiation, making them unsuitable for civilian use in homes or other environments.
Innovation Solution
A circuit for power conversion that includes a transformer, switch, and secondary-side rectifier module to output superimposed direct current and alternating current, with a voltage-doubling rectifier circuit and additional components for ozone reduction and safety, coupled with a plasma generation device and gas purifying unit to create directional plasma movement and reduce ozone ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-voltage direct current is used to drive fans, then thrust generation capability is improved, but ozone and radiation are generated making it unsuitable for civilian use
Solution Approach 1:
The patent changes the electrical parameters from pure DC to superimposed AC+DC waveform. The AC component modulates the plasma generation process to reduce ozone production while the DC component maintains the thrust generation capability. This parameter transformation allows the system to maintain high power output while eliminating harmful byproducts.
Solution Approach 2:
The patent converts the harmful ozone generation side effect into a beneficial air purification function. By operating in plasma mode with the superimposed AC+DC waveform, the fan system not only generates thrust but also ionizes and purifies surrounding air, eliminating the harm and creating a useful secondary function.
2Loss of energy
If a voltage-doubling rectifier circuit is used, then power conversion efficiency is improved, but circuit complexity increases
Solution Approach 1:
The patent segments the rectifier circuit into multiple stages with distinct functions. The voltage-doubling rectifier is divided into cascaded sections, each handling a portion of the voltage conversion. This segmentation allows for modular design, easier troubleshooting, and reduced complexity in each individual stage while achieving the overall voltage doubling function.
Solution Approach 2:
The patent employs periodic switching action in the rectifier circuit to achieve voltage doubling. By using alternating current cycles with controlled rectification during different half-cycles, the circuit accumulates voltage across capacitive elements periodically, achieving efficient voltage multiplication through time-based operation rather than complex simultaneous circuitry.
3Speed
If silicon carbide switch is used, then switching speed and efficiency are improved, but cost and manufacturing difficulty increase
Solution Approach 1:
The patent changes the material parameter of the switching device from conventional silicon to silicon carbide. This material parameter change enables higher switching speeds and better thermal performance, allowing the system to operate at higher frequencies with reduced losses, despite the increased manufacturing complexity.
Solution Approach 2:
The patent acknowledges the higher cost of silicon carbide components but compensates through extended system lifespan and reduced maintenance. The superior reliability and efficiency of SiC switches reduce operational costs over time, making the initial manufacturing investment worthwhile for high-value applications.
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
Enables the safe use of HV DC fans in civilian settings by minimizing ozone and radiation, providing a low-cost, efficient power conversion system for plasma generation and air purification.
Implementation Method 1
a transformer, wherein a first end of the primary side of the transformer is coupled to the positive input terminal and a second end thereof is coupled to the negative input terminal
Implementation Method 2
the secondary-side rectifier module includes a voltage-doubling rectifier circuit composed of a plurality of diodes and a plurality of capacitors for generating output signals
Implementation Method 3
a voltage-doubling rectifier circuit composed of a plurality of diodes and a plurality of capacitors
Implementation Method 4
air is ionized by high-voltage electricity, and then ionized air is accelerated by a strong electric field to generate ionized wind
Implementation Method 5
ionized air is accelerated by a strong electric field to generate ionized wind
Implementation Method 6
an RCD absorption circuit (e.g., a resistor-capacitor-diode (RCD) absorption circuit) on the primary side
Data Source
AI summary
Disclosed are a circuit, a fan system, and a transformer for power conversion. The circuit for power conversion includes: a voltage input terminal including a positive input terminal and a negative input terminal; a transformer, a first end of the primary side of the transformer being coupled to the positive input terminal and a second end thereof being coupled to the negative input terminal; a switch, a first end of which being coupled to the negative input terminal and a second end of which being coupled to the second end of the primary side; a first output terminal; and a secondary-side rectifier module coupled between the secondary side of the transformer and the first output terminal, for outputting, at the first output terminal, an output signal with superimposed direct current and alternating current.