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Rectifier circuit

A technology of rectifying circuit and rectifying current, which is applied in the direction of electrical components, high-efficiency power electronic conversion, DC power input conversion to DC power output, etc., to achieve the effects of miniaturization/low cost, suppression of large current, and easy control

Inactive Publication Date: 2013-07-17
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Also, it is difficult to miniaturize the inverter and realize low cost
In addition, with the generation of this large current, there is also a problem that the control of the inverter becomes difficult.

Method used

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Experimental program
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Effect test

no. 1 Embodiment approach

[0045]

[0046] figure 1 It is a circuit diagram illustrating the configuration of the DC power supply system according to the first embodiment of the present invention. The DC power supply system is composed of a three-phase voltage source 12 and a rectification circuit 10 for rectifying the three-phase AC voltage. In the rectifier circuit 10, the three-phase / two-phase conversion inductor 14 converts the three-phase power supplied from the three-phase voltage source 12 into two-phase power, and further passes through the first single-phase pulse width modulation converter 16 and the second single-phase Phase pulse width modulation inverter 18 performs pulse width modulation to operate load 92 .

[0047] The three-phase voltage source 12 is, for example, a brushless DC motor or an induction motor, and outputs a first phase voltage v1, a second phase voltage v2, and a third phase voltage v3. In addition, as the motive force of the three-phase voltage source 12, for example...

no. 2 Embodiment approach

[0116]

[0117] In this embodiment, the conduction start of switching switches S1 and S2 is described using the same circuit configuration as that of the above-mentioned first embodiment and regardless of the zero-cross timing of the fourth phase voltage Vinv1 and the fifth phase voltage Vinv2 with reference to the drawings. way of the moment.

[0118]

[0119] Figure 8 to Figure 10 All are diagrams showing the simulation results of the input and output waveforms of the second embodiment, the top graph shows the waveforms of the line currents Iin1 to Iin3 from the three-phase voltage source 12, and the second graph shows the first AC The waveforms of the current Iinv1 and the second AC current Iinv2 , the third graph shows the waveforms of the fourth phase voltage Vinv1 and the fifth phase voltage Vinv2 , and the lowermost graph shows the voltage value of the DC voltage Vdc held by the capacitor 20 .

[0120] Figure 8 shows the condition at start-up, Figure 9 shows t...

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PUM

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Abstract

According to the present invention, switches (S1, S2) perform switching at a timing when a first phase voltage (Vinv1) and a second phase voltage (Vinv2) outputted from a three-phase voltage source (12) have a phase difference of 90°. Then, a three-phase / two-phase conversion inductor (14) outputs two pairs of AC currents (Iinv1, Iinv2), and a rectification and a single-phase pulse-width modulation are performed on each of AC currents (i1, i2). Modulated currents (m12, m34) obtained as a result of the rectification and the single-phase pulse-width modulation are synthesized, to generate an output current (mi), which is supplied to a circuit (90) in which a capacitor (20) and a load (92) are connected in parallel with each other.

Description

technical field [0001] The invention relates to a rectifying circuit, in particular to a technology for rectifying three-phase current. Background technique [0002] Figure 11 It is a circuit diagram illustrating a conventional three-phase PWM inverter. When three-phase voltages Va, Vb, and Vc are applied to the converter CNV from the three-phase voltage source 12, the three-phase currents Ia, Ib, and Ic flow into the converter CNV via the reactor group Z. Figure 12 It is a figure showing the simulation result of the input / output waveform in the steady state of this three-phase PWM inverter, and to set the voltage Vdc to 700V, the three-phase current Ia, Ib, and Ic flow with a peak value of 12A. [0003] In addition, as a technique related to the present invention, Patent Document 1 and the like disclose a technique of using a PWM (Pulse Width Modulation: Pulse Width Modulation) power conversion device when converting three-phase power into two-phase power. [0004] Pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12
CPCH02M2001/007H02M1/4216Y02B70/126H02M3/1584Y02B70/10H02M1/007
Inventor 阿卜杜拉·梅基
Owner DAIKIN IND LTD