電路原理chapter10resonance-展示頁(yè)
2024-10-10 18:51本頁(yè)面
【正文】 Iω CLCL ??????3. characteristic impedance and quality factor 1). characteristic impedance ? unit： ? CLCL ??? 001???2). quality factor Q dimensionless CLRRCωRLωRQ1100 ???? ?Reactance of the inductor or the capacitor at resonance: a. Voltage relation： RIUU R ??? ?? 0??? ?????? UQIRRLILUL jjj0000??????????? UQIRCRCIUC j1jj 0000 ??Quality factor： UUUURILIωRLωQ CL 000000 ????or UL0 = UC0=QU b. Power relation The source supplies： reactive power 200 c o s RIUIP ???0s i n0 ??? UIQaverage power + _ P Q L C R c. Energy relation tLItCUCuw cmCC co s21co s2121 22 0m22 02 ?????tICLtCItUu CC c os)90 s i n ()90 s i n ( m0o0m0om0 ???? ??????tLILiw L s i n2121 22 0m2 ???tUu s i nm0 ??let tItRUi s i n s i n m00m ?? ??then energy stored in electrical field energy stored in magic field 2020m20m 2121 LICULICCL ?????總4. resonance curve and selectivity of the series RLC circuit 1). Frequency characteristic of impedance Z RXRXXRωCωLω CL 111 tgtg1tg) ( ??? ??????)(|)(|)1(j ωφωZCωLωRZ ?????222222 )()1(|)(| XRXXRCωLωRωZLL ????????The frequency response of the impedance magnitude The frequency response of the impedance phase X(? ) |Z(? )| XL(? ) XC(? ) R ? 0 ? Z (? ) O Frequency response of the impedance magnitude ? (? ) ? 0 ? O –?/2 ?/2 Frequency response of the impedance phase ? 0 ? O |Y(? )| I(? ) I(? ) U/R 2).
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