Three phase ac power filter

Abstract

A three-phase AC power filter includes: a first pin electrically connected to a first X capacitor, a first Y capacitor, a first varistor, and a first inductor; a second pin electrically connected to a second X capacitor, a second Y capacitor, a second varistor, and the first inductor; a third pin electrically connected to a third X capacitor, a third Y capacitor, a third varistor, and the first inductor; a fourth pin electrically connected to the first inductor, a fourth Y capacitor, and a fourth varistor; a gas discharge tube, one end of which is electrically connected to the first varistor, the second varistor, the third varistor, and the fourth varistor; and a grounding wire; wherein the first, second, and third pins provide live wires electrically connected to the three-phase AC power supply terminals, and the fourth pin provides a neutral wire electrically connected to the three-phase AC power supply terminals, thereby providing electrical connection to a three-phase AC power supply and having lightning protection.

Claims

1. A three-phase AC power supply filter, comprising: A first pin is electrically connected to one end of a first X capacitor, one end of a first Y capacitor, one end of a first varistor, and one end of a first inductor; a second pin is electrically connected to one end of a second X capacitor, one end of a second Y capacitor, one end of a second varistor, and one end of the first inductor; a third pin is electrically connected to one end of a third X capacitor, one end of a third Y capacitor, one end of a third varistor, and one end of the first inductor; a fourth pin is electrically connected to the other end of the first X capacitor, the other end of the second X capacitor, the other end of the third X capacitor, one end of a fourth Y capacitor, one end of a fourth varistor, and the fourth end of the first inductor; a gas discharge tube is electrically connected at one end to the other ends of the first varistor, the second varistor, the third varistor, and the fourth varistor, respectively. A second inductor, the first terminal of which is electrically connected to one terminal of a fourth X capacitor and the eighth terminal of the first inductor; the other terminal of the fourth X capacitor is electrically connected to the fifth terminal of the first inductor and the fourth terminal of the second inductor; a fifth X capacitor, one terminal of which is electrically connected to the seventh terminal of the first inductor and the second terminal of the second inductor; the other terminal of which is electrically connected to the fifth terminal of the first inductor and the fourth terminal of the second inductor; a sixth X capacitor, one terminal of which is electrically connected to the sixth terminal of the first inductor and the third terminal of the second inductor; the other terminal of which is electrically connected to the fifth terminal of the first inductor and the fourth terminal of the second inductor; a fifth pin, which is electrically connected to one terminal of a fifth Y capacitor, one terminal of a seventh X capacitor, and the eighth terminal of the second inductor; and a sixth pin, which is electrically connected to one terminal of a sixth Y capacitor, one terminal of an eighth X capacitor, and the seventh terminal of the second inductor. A seventh pin is electrically connected to one end of a seventh Y capacitor, one end of a ninth X capacitor, and the sixth end of the second inductor. An eighth pin is electrically connected to the fifth terminal of the second inductor, the other terminal of the seventh X capacitor, the other terminal of the eighth X capacitor, the other terminal of the ninth X capacitor, and one terminal of an eighth Y capacitor; and a ground wire, which is electrically connected to the other terminals of the first Y capacitor, the second Y capacitor, the third Y capacitor, the fourth Y capacitor, the gas discharge tube, the fifth Y capacitor, the sixth Y capacitor, the seventh Y capacitor, and the eighth Y capacitor; wherein the first, second, and third pins are provided as live wires electrically connected to the three-phase AC power supply terminal, the fourth pin is provided as a neutral wire electrically connected to the three-phase AC power supply terminal, the fifth, sixth, and seventh pins are respectively provided as live wires electrically connected to the load terminal, and the eighth pin is provided as a neutral wire electrically connected to the load terminal.

2. The three-phase AC power supply filter as described in claim 1, wherein the first X capacitor, the second X capacitor, the third X capacitor, the fourth X capacitor, the fifth X capacitor, the sixth X capacitor, the seventh X capacitor, the eighth X capacitor, and the ninth X capacitor are safety capacitors, which are used to suppress electromagnetic interference of the power supply and to eliminate differential mode interference.

3. The three-phase AC power supply filter as described in claim 1, wherein the first Y capacitor, the second Y capacitor, the third Y capacitor, the fourth Y capacitor, the fifth Y capacitor, the sixth Y capacitor, the seventh Y capacitor and the eighth Y capacitor are safety capacitors, which are used to suppress electromagnetic interference of the power supply and to eliminate common-mode interference.

4. The three-phase AC power supply filter as described in claim 1, wherein the first inductor and the second inductor are common-mode inductors, which provide filtering of common-mode electromagnetic interference signals and provide (EMI) filtering to suppress electromagnetic waves radiated outward.

5. The three-phase AC power filter as described in claim 1, wherein the first varistor, the second varistor, the third varistor, and the fourth varistor provide voltage limiting protection. When an overvoltage is generated due to a lightning strike across the terminals of the first varistor, the second varistor, the third varistor, and the fourth varistor, the voltage will be clamped to a relatively fixed voltage value to achieve the effect of voltage limiting protection.

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