Direct type AC power converting device

A technology of power conversion device and DC power supply, applied in output power conversion device, AC motor control, conversion of AC power input to AC power output, etc., can solve the problem of increasing inrush current, prevent damage and prevent symmetry destroyed effect
CN101796710BActive Publication Date: 2012-10-10DAIKIN IND LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DAIKIN IND LTD
Publication Date
2012-10-10

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Abstract

Provided is a direct type AC power converting device capable of reducing a rush current. A control unit (5) controls a current type converter (1) while a switch (S1) being ON, so that the voltage between an neutral phase input line (ACLn) having a resistor (R1) and any of input lines (ACLr, ACLs and ACLt) is subjected to a voltage doubler rectification and to a charge of clamp condensers (Cc1 andCc2). Thus, the clamp condensers (Cc1 and Cc2) are charged through the resistor (R1) so that the rush current can be prevented from flowing through them. Moreover, the terminal voltage of one set of the clamp condensers (Cc1 and Cc2) is higher than that of one set of condensers (Cr and Cs). Even if the clamp condensers (Cc1 and Cc2) and the condensers (Cr and Cs) are electrically connected at an ordinary running time, the rush current can be prevented from flowing from the condensers (Cr and Cs) to the clamp condensers (Cc1 and Cc2).
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Description

technical field

[0001] The present invention relates to a direct AC power conversion device, and particularly relates to a technique for preventing an inrush current to a capacitor included in the direct AC power conversion device. Background technique

[0002] Non-Patent Document 1 described later discloses a direct AC power converter including a clamp circuit. Figure 24 A direct AC power converter described in Non-Patent Document 1 is shown. However, for the sake of convenience in the description of the present application, the symbols in the drawings do not necessarily match the symbols in Non-Patent Document 1.

[0003] An IPM motor is provided on the output side of the direct AC power conversion device. La is the inductance per phase corresponding to the average value of the effective inductance of the IPM motor, i is the overload current that serves as a basis for cutting off the current supply to the IPM motor, and the voltage across the clamp capacitor is Vc, the ...

Claims

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