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Introduction

LGJ2D391MELB20 belongs to Aluminum Electrolytic Capacitors which are widely used in DC, converters, power electronics, inverters, resonant circuits, various types of autonomous linear and switch circuits, and other fields requiring high frequency and high ripple current input. This article will introduce its application field and working principle in detail.

Application Field

Aluminum electrolytic capacitors are widely used in DC, converters, power electronics, inverters, resonant circuits, various types of autonomous linear and switch circuits, and other fields requiring high frequency and high ripple current input. As for the LGJ2D391MELB20, it is a wide temperature range type series with a capacitance of 2.7 to 270μF. It is mainly used in the fields of power module circuits and field-excited inverter circuits.

• Inverter circuits: frequency-controlled single-phase and three-phase thyristor drives, fuel pumps, fans, etc.
• Power module circuits: switching converters, regeneration brakes, etc.

Working principle

Aluminum electrolytic capacitors are actually composed of two electrodes. There are two polarized electrolytes between the two electrodes. When a voltage is applied, cations move to the other electrode due to the mobile anions in the electrolyte. The two electrodes have different potentials accordingly, whereby the electric potential energy is converted into two kinds of chemical energy of the electrolyte ions. At the same time, the electrolyte ions form a conductive solution between the two electrodes, thereby forming a capacitance.

The working principle of the LGJ2D391MELB20 is the same, which mainly consists of two parts: aluminum shell and electrolytic paper. Inside the aluminum shell is a rolled electrolytic paper saturated with organic electrolyte, and the inside is sealed with aluminum cover and corrosive resistant rubber washer. When a voltage is applied, the organic electrolyte will generate ions, which will move from the positive electrode to the negative electrode and form an electric field between the two.

Conclusion

LGJ2D391MELB20 belonging to Aluminum Electrolytic Capacitors is mainly used in the fields of power module circuits and field-excited inverter circuits. The electric principle of this type of capacitor is that when a voltage is applied, cations move to the other electrode due to the mobile anions in the electrolyte. The two electrodes have different potentials accordingly, whereby the electric potential energy is converted into two kinds of chemical energy of the electrolyte ions. This article has introduced the application field and working principle of the LGJ2D391MELB20 in detail.

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