Comparison of characteristic by Transformer Winding Method of Contactless Power Transfer Systems for Electric Vehicle

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1 SPC-9-39 Comparison of characteristic by Transformer Winding Method of Contactess Power Transfer Systems for Eectric ehice Tauya wata, Natsui Ehara, Yasuyoshi Kaneo, Shigeru Abe (Saitama University) Tomio Yasuda, Kazuhio da (Technova nc.) This paper describes comparison of characteristics between doube-sided winding and singe-sided winding of contactess power transfer systems for eectric vehices. There is an issue that a sef-inductance changes by eectric current with a fixed gap ength in singe-sided winding. However, the issue is resoved by controing secondary votage constant. As for doube-sided winding, a transformer can be miniaturized in comparison with singe-sided winding. However, couping factor is sma, and a countermeasure for bac eaage fux becomes necessary, too. eaage fux is shieded by putting an auminum board on the bac. n addition couping factor becomes arger. (Eectric vehice, Pug-in hybrid vehice, Contactess power transfer, eectromagnetic induction, resonance, efficiency). PHE ()()(7)~().5. Hz ()() ()(3)(4) (5)(6) / / (6) (a) (b) Fig.. Contactess Power Transfer System for eectric vehice. 6

..(3) x + x 5 (a) 5 (b) b () () 3 x, x, x a 4 5 3 (a) Doube-sided winding (b) Singe-sided winding Fig.

2 . 3 T C s, C p R 4 a=n /N r r, r x, x, x r, r r 5a 3 C p f x' x () = x p ωcp = x + x...() () x x = xs = + x...() ω C x + x S 4 ' ' x = b, = b, b =...(3) x + x 5 (a) 5 (b) b () () 3 x, x, x a (a) Doube-sided winding (b) Singe-sided winding Fig.. Transformer 3 Fig.3. Contactess power transfer system 4 Fig.4. Detaied equivaent circuit. (a) Simpified equivaent circuit. (b) dea transformer. 5 Fig.5. Simpified equivaent circuit and dea transformer. 6 =. (a) () 6 6

3 A y:5 A (a) Doube-sided winding. mm 3 R CR ()() C s C p C s C p 3 CR C p Z= / R = 7 Z C p 3 (=/ω C p ) 4 C s,c p 8 CR 3 z x unit: mm (b) Singe-sided winding 6 Fig.6. Dimension of transformer. Tabe. Specification. Doube-sided winding Singe-sided winding Weight 7.3g.6g Core FDK 6H4 B s =.53T, µi=4(at.mhz) Primary p T p T Secondary p T p T itz wire.5φ 4 6 max =38A Tabe. Resonant capacitors. Doube-sided winding Singe-sided winding f [Hz] gap[mm] C s [µf].8.7 C p Z[] Z f [Hz] 7 Fig.7. Frequency characteristics of Z. [H] [A] θ [] 5-5 Fig.8. Current dependence of singe-sides winding. 36

4 3 Tabe 3. Experiment resuts. Doube-sided winding Singe-sided winding R []. f[hz] 4 [] 5.(5.) 43.(43.) [A].(.7) 4.(3.) [] 46.(46.) 44.(38.) [A] 3.8(4.3) 3.6(3.5) P [W].8(.6).(.87) P [W].(.7).94(.84) η[%] 96.(95.9) 97.3(98.4) [%] 98.7(99.) 99.8(99.6) B [T].9.7 B [T].. cacuated vaue.,,, Fundamenta component rms vaue. 33 (5mm) R 7,, R R 9 R C p p R 34 C p,c s C p,c s 5mm 3mm,7mm b / 3mm 8 A 8 A 8 A 8 A ()R =Ω ()R =Ω (3)R =7Ω (a) Doube-sided winding (4)R = (5)R = (6)R =7 (b) Singe-sided winding 9 Fig.9. Characteristics with resistance-oad. [H] P [W], otage [], [%] P Cacuated vaue [] R [H] gap[mm] gap [mm] (a) Doube-sided winding (b) Singe-sided winding Fig.. Parameters with gap change. P [W], otage [], [%] 3 P R 7 [] (a) Doube-sided winding (b) Singe-sided winding Fig.. Characteristics with resistance-oad change. Cacuated vaue 46

5 [] otage 5 9 [%], otage 8 Cacuated vaue Cacuated vaue gap [mm] gap [mm] (a) Doube-sided winding (b) Singe-sided winding Fig.. Characteristics with gap change. [] [%], [H] [H] [H] [] otage x [mm] y [mm] r [mm] (a) Doube-sided winding (b) Singe-sided winding 3 Fig.3. Parameters with horizonta gap change. 5 5 [%]. 95 otage [], [%] 95 otage [], [%] 95 Cacuated vaue Cacuated vaue Cacuated vaue x [mm] y [mm] (a) Doube-sided winding 4 Fig.4. Characteristics with horizonta gap change. (b)3mm 94.% C p 35 5 c / g 5 3 =. 4 6 x,y c/g=.5 c/g= b 6(a) 6(b) / a b d C p,c s e 4 7mm 95.% r [mm] (b) Singe-sided winding 56

6 .7.6 Singe-sided winding Doube-sided winding c/g 5 c/g Fig.5. Characteristics of couping factor with c/g c b b e c b e a d a d (a) Doube-sided winding (b) Singe-sided winding 6 Fig.6. Measure comparison with winding configuration 4 Tabe 4. Characteristics comparison with winding configuration. () Chwei-Sen Wang, Osar H. Stieau, and Grant A. CovicDesign consideration for a contactess eectric vehice battery charger, EEE Trans. nd. Eectronics, o.5, No. 5, pp (5) () R.aouamer,M.Bruneo,J.P.Ferrieux,O.Normand,N.Buchheit "A muti-resonant converter for non-contact charging with eectromagnetic couping", ECON 97. 3rd nternationa Conference on ndustria Eectronics, Contro and nstrumentation, o., pp (997) () A.W.Green and J.T.Boys Hz inductivey couped power transfer concept and contro, EE Power eectronics and variabe speed drives conference, PED, No.399, pp (994) () J.T.Boys, G.A.Covic and A.W.GreenStabiity and contro of inductivey couped power transfer systems, Proc. EE - Eect. Power Appicat., o.47, No., pp () (), D,o.7,No., pp.74-8 (7) (), D,o.8,No.7, pp (8) (),,o.8,no., pp (8) (),,o.8,no., pp (8) (),,T-7-,pp7-(7) (),,No.4-96 (8) a a+c b+c 4b+c d+e d+e

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