趨膚效趨膚深度：在此深度電流為表面電流的1/e趨膚深度：在此深度電流為表面電流的1/e無(wú)限長(zhǎng)圓直導(dǎo)線1串聯(lián)諧振和并聯(lián)諧 C1ZL10ZC(0)ZL(0) ZC(0)ZL(0圍成一圈的導(dǎo)線LLrecLrec x.Dddd Dd圓環(huán)直徑一小段導(dǎo)線構(gòu)成一個(gè)電感。（回流在無(wú)限遠(yuǎn)處

2y

2xnH

x.矩形長(zhǎng)2rL2r一個(gè)實(shí)際電阻的等效電一個(gè)實(shí)際電阻的阻抗-頻率特一個(gè)實(shí)際電容的等效電一個(gè)實(shí)際電感的等效電低頻可調(diào)電實(shí)際的貼片電阻、電容和電有功功率和無(wú)功功ivvtVivitIcostzvtitVIcosz1cos2tVIsinzcos有功VI 無(wú)功VIQ

Q Ri2 RQ i2

QL 2 C

QC

Q2 RR

CVQ

0

Q2

V 0 I2

T VN11NV22RL' 1N 2NN1N12V1jL1I1

, , V

I2

LLMV L jLL 1 1

( 2M ac L1n n

Ls n L1n

L2Ls2

LsMM

Ls

(續(xù)二理想變線圈

負(fù)載線間M V1jL1I1 V1j(LaLb)I1jLb

VjL

cLb理想與實(shí)際選頻電路(幅頻B2(f1f0) r 實(shí)際選頻電路矩形總是大于1,越接近1越φf(shuō)φf(shuō)f()AcostAcos(tk)Acos(tktkttkt相頻特性(二tkt )

Vcm[1macos(tk)]cosc(tk)()k(VVmcos()k(VAMVcm(1macost) tmaVcm )t ma

cost

{cos[()tk]cos[()t mVcm ct cm2

c)tk]

c)tVcm[1macos(tt()k

相頻特性(四

Vcm[1macos(tk)]cosc(tkt ()k(c

Vcm[1macos(tktt理想與實(shí)際選頻電串聯(lián)諧振選頻電Zr L1

1)

Zej(Z

(Z)arctg rIr2r2(L1

Vsm IImr2(L111111 (2 r 00ω1Q21Q0L,1Q21 2 ()( 2 20 0 2 2 1Q1Q2(2f0.72

1Q21Q2Q10

Kr0.1

L (Z)arctg Cr

L ()(Z)arctg Crarctg0L( 0 0 20

arctg(rjL) CL

1r(L

L prjL p

1(L

|Z|最大時(shí)|Z|最大時(shí)pZp虛部為 p1rZpRpL

VZp

高QpL高Qr

1

rp rp

r 2 r22 11rp

11高Q

r

因

pL(

p 1j

Zp

L

LL L Cr1

L

Cr1

式1.2-幅

相 VZpIs L

1j

()arctg(L

11()LrC1 1 p LrpLrZpRp

|Zp|最大時(shí)(諧振時(shí)

R RL所 RpLY 2jL2

r22 j r22L2QL

1L'L,R

2rYjc rj(L1 (r 高Q條件下：Lrj(L1Y ccrj(c1L 理想變理想變R' 1NL 2NL 1N阻抗變換網(wǎng) 自耦變壓阻抗變換網(wǎng) 雙電感和雙電容變換網(wǎng) (LL

(CCRL' RL

R' 2 RLCC LCC RR'jL L1jL2L j(L1L2

2C

(L1L2L2L2

QQRLp R(LL) 2 2 1 1

p(L1L2)R1

,

----I R1

2

I 2 2

R222RR2R322R2 2 2

2R2R2

2 R1R2 RR 2123123 接入系

pp L1

1

p