In the selection and current inspection tests of the variable frequency resonance withstand voltage test device, we often mention the Q value. So, what does the Q value refer to here? What factors can affect the Q value in the variable frequency resonance withstand voltage test device? How is the Q value calculated? Is a higher Q value always better for the variable frequency resonance withstand voltage test device? Wuhan Guodian Xigao has been researching and producing variable frequency resonance withstand voltage test devices for many years, and combines years of on-site experience with you to explain in detail.
The Q value of the variable frequency resonance withstand voltage test device is related to components with inductive characteristics. The Q value is basically impossible to calculate and can only be measured using an LCR bridge. Measuring at a frequency close to the actual working frequency will be more accurate. Series resonance belongs to voltage resonance, and the resonant voltage is Q times the bus voltage. Parallel resonance is current resonance, and the resonant current is Q times the bus current. This Q value thing is not fixed in actual applications and can vary greatly. For example, in no-load and full-load conditions, at low temperatures and high temperatures, the Q value changes significantly.
What is the Q value? The Q value is affected by external factors such as voltage level, process structure, and material performance. Theoretically, the larger the Q value, the smaller the allowable frequency deviation per unit current change and the higher the frequency selectivity. The Q value is the main parameter for measuring inductors. Its calculation method is: Q = the energy carried by energy storage devices such as inductors and capacitors ÷ the loss power of the resistor.
In the variable frequency series resonance test device, what factors affect the Q value? The size of the Q value is affected by comprehensive factors such as manufacturing process, raw materials, and material performance. For example, for the same inductor, if other parameters remain unchanged, only changing the thickness of the wire used to wind the inductor, the Q value of the wire with a thicker diameter will be higher than that of the wire with a thinner diameter. If the wire is plated with silver, the Q value of the inductor wound with the plated wire will be higher than that of the inductor wound without plating. Obviously, this is the influence brought by the manufacturing process and raw materials.
For the Q value of the series resonance test device, the lower the Q value, the less the loss of the circuit, and the higher the efficiency. The size of the Q value can also be used to simply judge the quality and performance of the product. However, it is not the final standard for determining the quality of the variable frequency resonance device. The increase in Q value is often limited by some factors, such as the DC resistance of the wire, the dielectric loss of the coil frame, the loss caused by the core and shielding, and the skin effect during high-frequency operation.
Is it better for the Q value of the variable frequency series resonance test device to be higher or lower? Then, when purchasing a variable frequency series resonance test device, should we measure the Q value? For customers who are not very familiar with it, they may think that “a higher Q value means a better product”. The Q value is just a conceptual reference. The Q value does not represent the factors or factors that determine the performance of the product. For example, an excessively high Q value may cause the inductor to burn out, the capacitor to break down, and the circuit to oscillate. For some technological products, even if the material selection and process are very good, they may try to reduce the Q value. Therefore, the Q value is only the quality factor for measuring the efficiency of the inductor.
Post time: Aug-12-2026