Characteristics of electrolytic capacitor

Polar electrolytic capacitors usually play the role of power filtering, decoupling, signal coupling, time constant setting, and DC in the power circuit or in the middle frequency and low frequency circuits. Generally, it can not be used for AC power circuit. When using the filter capacitor in the DC power supply circuit, the anode (positive pole) should be connected with the positive end of the power supply voltage, the cathode (negative pole) is connected with the negative end of the power supply voltage, and the negative electrode can not be connected, otherwise the capacitor will be damaged. Nonpolar electrolytic capacitors are usually used in speaker divider circuit, TV S correction circuit and single phase motor starting circuit.

Electrolytic capacitors are widely used in household appliances and various electronic products, with a large capacity range, generally 1~1000 mu F, and the rated operating voltage range is 6.3~450V. The disadvantages are dielectric loss, large capacity error (maximum allowable deviation of +100%, -20%), poor heat resistance and long storage time.

Back to the beginning, why is the electrolytic capacitor replaced by the CBB capacitor? This is due to the change in the type of filter, the direct flow wave using polar electrolytic capacitors, and the flow wave using the non polar CBB capacitor. When the flow wave needs to be filtered, the capacitor will be replaced with the CBB capacitor. And when the circuit is high frequency circuit, it is more necessary to use CBB capacitor.

At present, more and more applications of AC wave are used, and more and more AC wave devices are used, so there is a kind of illusion that the CBB capacitance is gradually replacing the electrolytic capacitor. In fact, the application of DC is still inseparable from electrolytic capacitors. I hope that after reading this article, you can have a clear understanding of the difference between electrolytic capacitors and CBB capacitors.