A new type high frequency transformer

Hayano, S.; Nakajima, Yoshiki; Saotome, H.; Saito, Yoshifuru

doi:10.1109/20.278788

Cited by 32 publications

(14 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Each film is constructed by the chemical etching processes. The operating principal is based on the skin effect similar to that of our coreless transformer [5]. This fact was confirmed by comparing their frequency characteristics.…”

Section: Introductionsupporting

confidence: 57%

See 1 more Smart Citation

Thin film transformer and its analysis by integral equation method

et al. 1995

Self Cite

View full text Add to dashboard Cite

Abstract-Recently, we proposed a new high frequency transformer that could allow the manufacture of small power supplies. In this paper, we propose a thin film transformer for small electronic devices, and apply the integral equation method to analyze this transformer. Both the primary and secondary coils of the film transformer are arranged coaxially on one layer and multiply laminated. The operation principal of the transformer is based on the skin effect and the mutual effect between the coils at high frequency. Because of the coaxially arranged coils, the magnetic field of the transformer can be modeled with an axisymmetric assumption. Using the model, we evaluate the electromagnetic field and calculate the lumped circuit parameters, i.e., inductance and resistance, which are compared with experimental values. A fairly good agreement is obtained. Thus, the applied method is quite useful for design and investigation of the thin film transformer.

show abstract

Section: Introductionsupporting

confidence: 57%

“…Another solution of this problem is to exploit a coreless transformer. Already, we have succeeded in making a coreless transformer with high efficiency and demonstrated its usefulness for the dc to dc converters [5].…”

Section: Introductionmentioning

confidence: 99%

Thin film transformer and its analysis by integral equation method

et al. 1995

Self Cite

View full text Add to dashboard Cite

show abstract

“…10. The transformer dimensions are de- From (19), the variations of self, mutual and leakage inductances of the coreless PCB transformer at 10 MHz are 0.73 nH/MHz, 1.225 nH/MHz and 0.355 nH/MHz, respectively. When the testing frequency sweeps from 1 MHz to 30 MHz, the changes of the inductive parameters are tabulated in Table II.…”

Section: Frequency Characteristics Of Coreless Pcb Transformersmentioning

confidence: 99%

Characterization of coreless printed circuit board (PCB) transformers

Tang

Hui

Chung

2000

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

In this paper, coreless printed-circuit-board transformers are characterized. A range of coreless printed circuit board (PCB) transformers with different geometric parameters have been fabricated and tested. Based on a recently reported analytic method, the self inductance of these transformers is calculated. This analytical method is also extended to cover the prediction of the transformers' mutual inductance. All calculated parameters have been confirmed with measurements for the frequency range from 100 kHz to 30 MHz. These results provide useful information for the optimal design of coreless PCB transformers. Index Terms-Coreless PCB transformers, planar transformers and windings, printed circuit board transformers.

show abstract

“…The operating principle is based on the skin effect similar to that of our coreless transformer [5].…”

Section: Introductionmentioning

confidence: 99%