B43888A9686M000

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Aluminum electrolytic capacitors are widely used in electronics and electric appliances. B43888A9686M000 (hereinafter referred to as B4) is one type of electrolytic capacitors, which are mainly used in high-frequency circuit, active filter, DC-DC converter, switch mode power supply (SMPS) and so on. This paper mainly introduces the application fields and working principle of B4.

1. Introduction of Main Parameters of B4

The main parameters of B4 mainly include capacitance (nominal values between 10uF and 1000uF), rated voltage (nominal values between 25V and 450V) and size (mainly indicated by the length of the lead, which is 10mm, 8mm, 7mm, 6mm and 5mm). The maximum permitted ripple voltage (measured under 120Hz at 20℃) of B4 ranges from 10mV to 30mV; The maximum capacitance deviation is ±20%; The maximum rated voltage deviation is ±10%.

2. Application Fields of B4

Generally, the application fields of B4 can be divided into two categories: high-frequency circuits and power electronic circuits.

2.1 High-Frequency Circuit Application Field

When the frequency of high-frequency circuits is higher than 100KHz, electrolytic capacitors can provide large capacitance and low equivalent series resistance (ESR) compared with other capacitors. Therefore, they are widely used in high-frequency circuits. Specifically speaking, B4 can be applied to such circuits as radio frequency (RF) resonant circuits, matching circuits of antenna, impedance transformation, single-sideband emission compensation, pulse circuits, etc.

2.2 Power Electronic Circuit Application Field

In power electronic circuits, electrolytic capacitors can help to reduce the input current ripple, increase the circuit’s overall efficiency and improve the power factor, which is important. B4 can be used in switch mode power supply (SMPS), DC-DC converter, active power filter, etc.

3. Working Principle of B4

Generally speaking, the working principle of B4 can be divided into two parts, one is the general capacitor working principle, and the other is the specific electrolytic capacitor working principles.

3.1 General Capacitor Working Principle

The general capacitor works in the same way as any other type of capacitor: a pair of conductive plates are placed on opposite sides of an insulating material called a dielectric. A voltage applied to the capacitor will cause one of the plates to collect charges of one polarity and the other to collect charges of the opposite polarity, thus creating an electric field between them and forming a charge-separation region called the electric double-layer. The resulting capacitance depends on the surface area of the two plates, the distance between them, and the dielectric constant of the material between them.

3.2 Specific Electrolytic Capacitor Working Principle

The electrolytic capacitor is composed of two plates and a liquid electrolyte. The plate with positive charge is called the anode (which is usually made of aluminum). The other plate with negative charge is called the cathode, which is usually made of metal oxide film. When the voltage is applied, a thin oxide film will be formed on the surface of the anode, which is called the dielectric film. This dielectric film is very thin (about 10-7 to 10-9 m), and can provide a higher capacitance than the ordinary capacitors.

The electrolytic capacitor can provide a much higher capacitance than other types of capacitors due to the large surface area, the thin dielectric film, and the effect of the electrolyte. It also has the advantage of occupying a small space for a given capacitance. Therefore, electrolytic capacitors are widely used in various circuits.

4.Conclusion

This paper mainly introduces the application fields and working principle of B43888A9686M000, which is one type of aluminum electrolytic capacitor. In summary, B4 can be applied to high-frequency circuits and power electronic circuits. Its working principle is mainly divided into general capacitor working principle and electrolytic capacitor specific principles. The end.

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