The series resonance under UHV power can help many power workers conduct various power tests more conveniently.

RLC series resonance characteristics

The study of the series resonance characteristics of RLC, especially the measurement of the quality factor Q, is an important experiment in electromagnetics. Although there are various methods for measuring Q value, its measurement accuracy is greatly affected by the measurement method and measuring instruments. The relationship between the AC voltage and the AC current value I (effective value) of the RLC series resonant circuit is shown in Figure 1. Two methods were used to measure the RLC series resonant circuit, and the results were approximately close to the theoretical values, indicating that both methods are correct. But both methods have their own advantages and disadvantages, as follows:

(1) The results of the broadband method are in good agreement with the resonant constant voltage method, and compared with the theoretical values, the values measured by the broadband method are closer to the theoretical values.

(2) The frequency selectivity of the circuit can be directly determined by the bandwidth of the resonance curve. The voltage resonance law requires calculation to determine the Q value, thereby knowing the frequency selectivity of the circuit

(3) The bandwidth method has significant advantages over the resonant constant voltage method in utilizing resonance points. The resonant voltage method is directly related to the measured values, and has high requirements for instrument selection and reading accuracy; The bandwidth method only focuses on data calculation and processing.

(4) The disadvantage of the bandwidth method is that it requires complex calculations and the creation of UR-f diagrams I-f diagram, using the bandwidth at resonance to obtain the Q value; The resonant constant pressure rule is directly calculated.

(5) When voltage resonance occurs, the voltage on the capacitor is equivalent to the voltage on the inductor, and both voltages are equal to Q times the power supply. The Q value can be directly obtained by the ratio of the voltage on the capacitor to the output voltage, which is measured by the voltage resonance method.