Series resonance (also known as AC withstand voltage testing equipment) has become a popular device in the power preventive testing industry in recent years, with an increasing number of customers. However, as a device that is highly similar to conventional test transformers, what are its advantages compared to test transformers? Understanding the performance of the product can help us better use series resonance equipment.
Firstly, series resonance is developed based on the LCR series resonance circuit, and its advantages are also the advantages of series resonance. As for why resonance occurs, users do not need to be overly concerned, just need to understand how to apply it according to its advantages, just like how we can drive a car, but not necessarily understand that making a car is the same. The biggest advantage of series resonance is that it will oscillate the voltage across capacitor C in the entire LCR series circuit into a higher voltage, which is a multiple of Q (the theoretical Q value can reach 80 or even higher, and the actual application is around 20-30). From this, we can see that this advantage is the reason why we use it to generate AC high voltage, and also the reason why we use series resonance as a voltage resistant device.
Again, the current in the circuit is equal everywhere, which means that the current I output by the power supply to capacitor C and the current I passing through the capacitor are the same. So, through the simplest P=UI calculation, the power P on the capacitor is Q times that of the power supply P. Its application in series resonance is that a low-power variable frequency power supply can output a large amount of power, and the higher the power, the more electrical equipment we can use to withstand voltage.
So, the advantage of series resonance is that it can use lower low voltage and power supply, generate higher voltage and greater electrical power output, so that series resonance can meet the withstand voltage requirements of larger and higher electrical equipment. If a test transformer is used, although it can also meet these withstand voltage requirements, the power, volume, and weight of this equipment are very high, which is not convenient for on-site use. More importantly, it has very high requirements for on-site power supply.
Of course, series resonance also has its limitations. Only by making the series resonance resonate with the tested object can the voltage be increased, which is not as simple and easy to learn as testing transformers.