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Direct type AC power converting device

A technology of power conversion device and DC power supply, which is applied in the direction of output power conversion device, AC motor control, and conversion of AC power input to AC power output. destroyed effect

Active Publication Date: 2010-08-04
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, as the capacitance C of the capacitor increases, the inrush current increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0079] As an example of the direct AC power conversion device according to the first embodiment of the present invention, figure 1 A schematic structure of a motor drive device is shown. This motor drive device is equipped with power supply E1, input lines ACLr, ACLs, ACLt, neutral phase input line ACLn, reactors Lr, Ls, Lt, capacitors Cr, Cs, Ct, current source inverter 1, DC power line L1, L2, clamping circuit 2, voltage type inverter 3, motor 4, control part 5, resistor R1, switch S1.

[0080] The power supply E1 is a polyphase AC power supply with a neutral point (not shown), for example, a 3-phase AC power supply. The output of the power supply El is provided to input lines ACLr, ACLs and ACLt.

[0081] Each of reactors Lr, Ls, and Lt is provided on input lines ACLr, ACLs, and ACLt, respectively.

[0082] The capacitors Cr, Cs, and Ct are provided between the input lines ACLr, ACLs, and ACLt, for example, in Y-connection. Specifically, capacitors Cr and Cs are connec...

no. 2 approach

[0136] As an example of the direct power conversion device of the second embodiment, Figure 11 A schematic structure of a motor drive device is shown. The schematic structure of the motor drive device is the same as the Figure 10 Indicates the same motor drive unit. in addition, Figure 11 In FIG. 2 , circuits subsequent to the clamp circuit 2 are omitted from illustration. Alternatively, clamp circuit 2 can also be figure 1 Expressed form.

[0137] Resistors R1 to R3 are inserted into input lines ACLr, ACLs, and ACLt, respectively. The auxiliary switch Sr is connected in series with any one of the reactors Lr-Lt, Figure 9 exemplifies a configuration in which the reactor Lr is connected in series. Reactors Ls, Lt and resistors R2, R3 are connected in parallel, respectively. A combination of the auxiliary switch Sr and the reactor Lr is connected in parallel to the resistor R1.

[0138] The energization detection / synchronization signal generation unit 51 can contro...

no. 3 approach

[0153] In the direct AC power conversion device described in the first embodiment, for example, if the switch S1 remains on and switches to normal operation due to switch S1 or control failure, etc., the input line ACLr, The power line current flowing through ACLs and ACLt becomes asymmetrical, which may cause current distortion and overcurrent. First, refer to figure 1 The shown direct type AC power conversion device describes this problem in detail.

[0154] In the first embodiment, the transistors Srp, Srn, Ssp, Ssn, Stp, and Stn are used for performing normal operation. Figure 8 The dotted line shown represents the on-off action. Here, in order to simplify the description, the Figure 8 The solid line shown represents the on-off action.

[0155] Figure 15 Indicates the power supply phase voltages Vrn, Vsn and Vtn, the voltage Vc2 across the clamp capacitor Cc2, the power line currents Ir, Is, It, and the power supply neutral point line obtained when normal operatio...

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PUM

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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 and Cc2). 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).

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02M7/12H02M7/48
CPCH02M1/36H02M7/797H02M7/219H02P27/06H02P2207/05H02M5/4585
Inventor 榊原宪一
Owner DAIKIN IND LTD
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