Design of a resonant converter power transformer when using its leakage inductance in oscillatory circuit

In this paper, a novel MEMS based LLC converter is proposed for on chip power supplies. The design is optimized based on commercially available Metal MUMPs process for fabrication. The resonant frequency is optimized at 20MHz and MEMS based variable capacitor is fabricated on the chip to tune the peak resonance frequency of circuit which varies due to the load variations. The Design is simulated in FEM based numerical software COMSOL and Intellisuite. According to analysis the magnetizing inductance of 42nH and leakage inductance of 40nH has been achieved from 16 mm2 rectangular coil transformer. The total capacitance of 1500pF has been achieved from parallel plate capacitors and variation of 3pF has been achieved from variable capacitor.

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On Simplified Calculations of Leakage Inductances of Power Transformers

Energies ◽

10.3390/en13184952 ◽

2020 ◽

Vol 13 (18) ◽

pp. 4952 ◽

Cited By ~ 1

Author(s):

Tadeusz Sobczyk ◽

Marcin Jaraczewski

Keyword(s):

Power Transformer ◽

Short Circuit ◽

Power Transformers ◽

Stray Field ◽

Good Representation ◽

The Finite Element Method ◽

Leakage Inductance ◽

Leakage Flux ◽

Calculation Results ◽

Discrete Differential Operator

This paper deals with the problem of the leakage inductance calculations in power transformers. Commonly, the leakage flux in the air zone is represented by short-circuit inductance, which determines the short-circuit voltage, which is a very important factor for power transformers. That inductance is a good representation of the typical power transformer windings, but it is insufficient for multi-winding ones. This paper presents simple formulae for self- and mutual leakage inductance calculations for an arbitrary pair of windings. It follows from a simple 1D approach to analyzing the stray field using a discrete differential operator, and it was verified by the finite element method (FEM) calculation results.

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Series-Series/Series Compensated Inductive Power Transmission System with Symmetrical Half-Bridge Resonant Converter: Design, Analysis, and Experimental Assessment

Energies ◽

10.3390/en12122268 ◽

2019 ◽

Vol 12 (12) ◽

pp. 2268 ◽

Cited By ~ 1

Author(s):

Jianfeng Hong ◽

Mingjie Guan ◽

Zaifa Lin ◽

Qiu Fang ◽

Wei Wu ◽

...

Keyword(s):

Theoretical Analysis ◽

Power Transmission ◽

Low Frequency ◽

Resonant Converter ◽

Inductive Power Transfer ◽

Leakage Inductance ◽

Analysis And Design ◽

Converter Design ◽

Inductive Power Transmission ◽

Inductive Power

In order to compensate the large leakage inductance and improve the power transmission capacity, capacitors are widely used in inductive power transfer (IPT) systems, which results in high voltage or current stresses in the resonant tanks and limits higher volt-ampere (VA) rating of the transfer power, especially in medium and low frequency applications. This paper presents a symmetrical half-bridge resonant converter (SHRC) for series-series/series compensated IPT systems with detailed analysis and design. It operates at a relatively low frequency of 12.5 kHz, suitable for IGBT applications. The theoretical analysis shows that, compared with full-bridge resonant converter (FRC) for IPT, the symmetrical half-bridge resonant converter achieves a higher efficiency. Simulation and a prototype of 1500 W power output were built to verify the theoretical analysis. The experimental results show that the power loss of SHRC is 39.7 W while that of FRC is 79.4 W, which is consistent with the theoretical analysis. The global efficiency of the IPT based on the proposed converter is 91.6%.

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