Three-phase rectifier

• US 20030161168A1
• Filed: 04/01/2003
• Published: 08/28/2003
• Est. Priority Date: 03/17/2000
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Sakakibara, Kenichi, Kawashima, Reiji, Tanatsugu, Isao, Kagimura, Sumio
• Granted Patent: US 7,187,566 B2
• Time in Patent Office: Days
• US Class Current: 363/125
• CPC Class Codes: H02M 1/126 using passive filters
• CPC Class Codes: H02M 1/4216 operating from a three-phase input voltage H02M1/4233 takes precedence
• CPC Class Codes: H02M 1/4266 using passive elements
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A capacitor-input type three-phase rectification circuit comprises a three-phase AC power supply (1), a diode rectifier circuit (4), and a low-frequency filter connected between the three-phase AC power supply (1) and the diode rectification circuitry (4), the low frequency filter consisting of AC reactors (2u)(2v)(2w) and Δ-connection or Y-connection capacitors (8u)(8v)(8w), so that higher harmonic currents are reduced to be equal to or less than standard values, and that lowering in input power factor and lowering in DC voltage are prevented from occurrence.

Claims

1. A three-phase rectifier comprising:

A three-phase AC power supply (1);

A diode rectification circuitry (4); and

A low frequency filter connected between the three-phase AC power supply (1) and the diode rectification circuitry (4), the low frequency filter consisting of AC reactors (2u)(2v)(2w) and Δ

-connection or Y-connection capacitors (8u)(8v)(8w).

2. A three-phase rectifier as set forth in claim 1, wherein %-impedance of each of the AC reactors (2u)(2v)(2w) is determined to be equal to or greater than 12% and to be equal to or less than 36%.

3. A three-phase rectifier as set forth in claim 1, wherein the inductance value of each of the AC reactors is determined to be equal to or greater than (V/400)²×

10 m H (where, V is a voltage of the three-phase power supply) and equal to or less than (V/400)²×

30 m H.

4. A three-phase rectifier as set forth in one of claims 1-3, a capacitance of the capacitor is determined to be a capacitance so as to determine a resonance period of the AC reactor and the capacitor to be equal to or less than 1 cycle even when load is light.

5. A three-phase rectifier as set forth in one of claims 1-4, wherein the capacitor comprises a capacitor included within a common mode filter for high frequency noise removal.

6. A three-phase rectifier as set forth in one of claims 1-4, wherein the capacitor comprises capacitors including a capacitor included within a common mode filter for high frequency noise removal.