手机维修基础知识（Basic knowledge of mobile maintenance）.docVIP

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手机维修基础知识（Basic knowledge of mobile maintenance）.doc

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手机维修基础知识（Basic knowledge of mobile maintenance） When resonant, the impedance of the network is minimum, and the resistance is pure, and the impedance remains the minimum, which is the DC resistance R1 in the loop. When the signal frequency is greater than or less than F0, the impedance of the network is greater than the impedance at f0. The more the signal frequency deviates, the greater the impedance of the network. (2) the voltage on the L1 is equal to the voltage on the C1, and is equal to the Q times of the signal voltage (Q is the quality factor), so the series resonance is also called voltage resonance. 2.LC parallel network harmonic oscillation Fig. 3-18 is a LC parallel resonant network and an impedance characteristic curve. R1 is the DC resistance of the L1. The resonance frequency f0 of the LC parallel resonant network is determined by the lower order: As can be seen from the previous formula, the resonant frequency of the LC parallel resonant network is independent of R1 and is only related to 11 and C1. When the signal frequency is equal to the intrinsic resonance frequency of the network, the parallel resonance occurs in the LC network. LC parallel resonance has the following characteristics: (1) in parallel resonance, the impedance of the network reaches the maximum, and is pure resistance, and the impedance is Q2R1. (2) the loop voltage reaches the maximum, that is, the signal voltage reaches the maximum at L1 and Cl. (3) the total current of the loop is very small, and the current of the capacitor and inductance branch reaches the maximum value, which is Q times of the total current of the circuit. However, the current of the capacitor and inductance branch is opposite and the magnitude is different, and the difference is the total current of the loop. Because the current in the capacitor and inductance branch reaches the maximum value in parallel resonance, the parallel resonance is also called current resonance. (4) different Q values have differen