Coaxial Transformer Layout for Current Control in HF Power Supplies
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Solution Overview
Problem
In conventional self-oscillating high-frequency power supply devices, it is difficult to adjust the turn ratio of the primary coil to the secondary coil due to their transformer structure, leading to challenges in appropriately setting the current flowing through the transformer and suppressing excessive current.
Innovation Solution
A self-oscillation high-frequency power supply device is designed with a DC power supply, an LC resonant circuit, and a switching circuit, where the LC resonant circuit includes an induction coil and a capacitor, and a resistor is connected in parallel to the primary coil of the transformer, forming a coaxial structure to manage current flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transformer is formed in a coaxial structure with fixed primary and secondary coils, then the transformer structure is simple and compact, but it becomes difficult to adjust the turn ratio and control the current flowing through the transformer
Solution Approach 1:
The patent divides the primary coil into multiple independent coil units (first primary coil unit, second primary coil unit, etc.) that can be independently connected or disconnected. This segmentation allows the turn ratio to be adjusted by selectively connecting different numbers of primary coil units, thereby controlling the current flowing through the transformer while maintaining the compact coaxial structure.
2Ease of manufacture
If the turn ratio of the transformer is fixed by its structure, then the transformer is simple to manufacture, but it is difficult to appropriately set the current flowing through the transformer
Solution Approach 1:
The patent introduces switching elements that enable dynamic reconfiguration of the primary coil connections. The switching elements allow the circuit to transition between different states (different numbers of active primary coil units), providing adaptability in current setting while maintaining a fixed manufactured structure. This dynamic switching capability allows the same transformer to be adapted to different current requirements without remanufacturing.
3Productivity
If no current limiting configuration is provided, then the power supply efficiency is high, but excessive current may flow through the transformer causing damage or instability
Solution Approach 1:
The patent employs switching elements that can be controlled based on feedback regarding the current state. By monitoring the operating conditions and controlling the switching elements accordingly, the system can regulate the current flowing through the transformer, preventing excessive current while maintaining efficient operation. The feedback mechanism allows the system to adjust the number of active primary coil units to maintain optimal current levels.
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 appropriate current flow through the transformer while preventing excessive current, enhancing power supply efficiency and reducing the need for DC bias voltage, thereby improving the stability and efficiency of the power supply.
Implementation Method 1
an LC resonant circuit including an induction coil for plasma generation and a capacitor
Implementation Method 2
The transformer includes a primary coil included in the LC resonant circuit and a secondary coil connected to the semiconductor element
Implementation Method 3
The LC resonant circuit includes a resistor connected in parallel to the primary coil
Data Source
AI summary
Provided is a high-frequency power supply device capable of causing an appropriate current to flow through a transformer. A self-oscillation high-frequency power supply device is provided with a DC power supply, an LC resonant circuit, a switching circuit, and a transformer. The LC resonant circuit includes an induction coil for plasma generation and a capacitor. The switching circuit includes a semiconductor element, the switching circuit being configured to subject DC power supplied from the DC power supply to switching processing to supply high-frequency power to the LC resonant circuit. The transformer includes a primary coil included in the LC resonant circuit and a secondary coil connected to the semiconductor element to turn on/off a semiconductor element. The transformer has a coaxial structure in which the primary coil and the secondary coil are coaxially provided. The LC resonant circuit includes a resistor connected in parallel to the primary coil.