RF Transformer Layout Without Shield Plates for Lower Eddy Loss
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Solution Overview
Problem
Conventional radio frequency high-voltage transformers experience significant eddy current induction and resistance loss due to leakage magnetic flux, and the shielding effect of the shield plate reduces magnetic coupling between windings.
Innovation Solution
A power conversion device design that eliminates the need for a shield plate by connecting the primary-side circuit and a closed circuit formed by the primary and secondary windings to a common potential, preventing eddy current generation and enhancing magnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield plate is disposed between the primary winding and the secondary winding to prevent abnormal voltage transmission, then voltage isolation is improved, but eddy current loss increases and magnetic coupling deteriorates
Solution Approach 1:
The invention removes the shield plate from the transformer structure entirely. By connecting the primary and secondary circuits to a common potential, the patent achieves voltage isolation through potential equalization rather than through a physical shield plate, thereby eliminating the source of eddy current loss while maintaining safety isolation.
Solution Approach 2:
The invention connects the primary-side circuit and the closed circuit to a common potential, creating an equipotential relationship between circuits that would otherwise be isolated. This eliminates potential differences that would drive eddy currents in shield plates, while still providing voltage isolation through the transformer's inherent galvanic isolation.
2Reliability
If a shield plate is disposed between the primary winding and the secondary winding to prevent abnormal voltage transmission, then voltage isolation is improved, but magnetic coupling between windings deteriorates
Solution Approach 1:
The invention removes the shield plate that was physically interrupting the magnetic flux path between primary and secondary windings. By eliminating this physical barrier, magnetic coupling is improved while voltage isolation is maintained through the common potential connection approach.
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 reduces energy loss and improves magnetic coupling between windings, enhancing the reliability and efficiency of the power conversion process while preventing interference and maintaining safety.
Implementation Method 1
a primary-side transformer including a primary-side primary winding to which a primary AC voltage is input and a primary-side secondary winding to which power is transmitted from the primary-side primary winding
Implementation Method 2
a secondary-side transformer including a secondary-side primary winding that forms a closed circuit together with the primary-side secondary winding, and a secondary-side secondary winding to which power is transmitted from the secondary-side primary winding
Implementation Method 3
the primary-side circuit and the closed circuit are connected to a common potential... preventing generation of an eddy current
Data Source
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AI summary
An aspect of the present disclosure is a power conversion device including: a primary-side transformer to which a primary AC voltage is input from a primary-side circuit; and a secondary-side transformer that outputs a secondary AC voltage lower than the primary AC voltage to a secondary-side circuit. The primary-side transformer includes a primary-side primary winding to which the primary AC voltage is input, and a primary-side secondary winding to which power is transmitted from the primary-side primary winding. The secondary-side transformer includes a secondary-side primary winding constituting a closed circuit together with the primary-side secondary winding, and a secondary-side secondary winding to which power is transmitted from the secondary-side primary winding and which outputs the secondary AC voltage. The primary-side circuit and the closed circuit are connected to a common potential.