Q: Dingfeng Capacitor -- When choosing a capacitor, the bigger the capacitor capacity, the better?
A: Many people think that when choosing a capacitor, choose the capacitor with the larger capacity as possible. The larger the capacitance, the stronger the current compensation capability that can be provided. However, as the capacitance increases, the volume of the capacitor increases and the cost increases. At the same time, it also affects air flow and heat dissipation.There is a parasitic inductance on the capacitor, and the capacitor discharge loop will resonate at a certain frequency. At the resonance point, the impedance of the capacitor is small, and the effect of replenishing energy is also the best. When the frequency exceeds the resonance point, the impedance of the discharge loop begins to increase, and the ability of the capacitor to provide current begins to decrease. The larger the capacitance of the capacitor, the lower the resonant frequency, and the smaller the frequency range in which the capacitor can effectively compensate the current. From the perspective of ensuring the ability of the capacitor to supply high frequency current, the view of “The bigger the capacitor, the better.” is wrong. There is a reference value in the general circuit design.
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