By hvhipot 
HV Hipot Electric Co., Ltd. specializes in producing series resonance (also known as series variable frequency resonance). Next, we will share with you the definition and advantages of series resonance.
1、 Definition of series resonance:
In an AC circuit containing resistor, inductor, and capacitor elements in series, when the power supply voltage U is in phase with the circuit current I, it is called resonance. Since the elements are connected in series, it is called series resonance.
2、 Advantages of series resonance:
Under normal circumstances, the inductance and capacitance of the circuit are much greater than the resistance component, so the voltage on the capacitor (test sample) and inductor is much higher than the power supply voltage. Therefore, series resonance is also known as voltage resonance. Its voltage value is XC/R (XL/R) times the power supply voltage. This ratio is often used in engineering to characterize the performance of resonant circuits, and is referred to as the quality factor of series circuits, represented by Q.
It is precisely because of the existence of Q value that a large test capacity can be obtained with a small excitation capacity and power supply capacity when using series resonance test. A higher test voltage can be obtained from a lower excitation voltage, thus completing the test of large capacity samples that are difficult to complete using test transformers. This is the biggest advantage of series resonance.