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Power converter

A power conversion device and power conversion technology, applied in the direction of output power conversion devices, electrical components, and adjustment of electrical variables, can solve the problem of low noise reduction effect and achieve the effect of reducing common mode noise

Active Publication Date: 2017-11-28
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to various experiments by the inventors of the present application, it has been found that the noise reduction effect is low in the frequency region where the ringing frequency and its harmonics are high.

Method used

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Embodiment 1

[0039] refer to figure 1 and FIG. 2 , the power conversion device according to the first embodiment will be described.

[0040] figure 1 An equivalent circuit diagram of the power conversion device according to the first embodiment is shown. The power conversion device according to Embodiment 1 includes external terminals T1 , T2 , a ground terminal (Earth Terminal) TE, a common mode choke coil 18 , and a power conversion circuit 10 . The power conversion circuit 10 includes a step-up converter 20 and an inverter 30 , and converts input DC power into AC power for output.

[0041] The external terminals T1 and T2 are respectively connected to the positive pole and the negative pole of the DC power supply 50 through the positive line 51 and the negative line 52 . The ground terminal TE is connected (grounded) to the earth through the ground wire 53 and is fixed at the same potential as the earth surface. The DC power supply 50 uses, for example, a solar panel, a fuel cell, o...

Embodiment 2

[0060] Next, refer to Figure 4 ~ Figure 6A , Figure 6B The accompanying drawings describe a power conversion device based on Embodiment 2. Hereinafter, differences from Embodiment 1 will be described, and descriptions of common configurations will be omitted.

[0061] Figure 4 An equivalent circuit diagram of the power conversion device according to the second embodiment is shown. In Embodiment 1, inductors 15, 16, 17 form a three-phase common mode choke coil 18 ( figure 1 ). exist Figure 4 In the shown embodiment 2, the inductors 15, 16, and 17 are constituted by independent coils, and there is no inductive coupling. The three inductors 15, 16, and 17 have the same electromagnetic characteristics.

[0062] refer to Figure 5A as well as Figure 5B , the respective electrical characteristics of the inductors 15, 16, and 17 will be described. Consists of an inductor 15 Figure 5B The two-terminal pair circuit is shown, and the transfer characteristic S21 is measu...

Embodiment 3

[0071] Next, refer to Figure 7 , the power conversion device based on Embodiment 3 will be described. Hereinafter, differences from Embodiment 1 will be described, and descriptions of common configurations will be omitted. In the first embodiment, the three-phase common mode choke coil 18 is inserted on the input side of the power conversion circuit 10 , but in the third embodiment, the three-phase common mode choke coil 18 is inserted on the output side of the power conversion circuit 10 . In addition, three-phase common mode choke coils 18 may be inserted on both the input side and the output side.

[0072] Figure 7 An equivalent circuit diagram of the power conversion device according to the third embodiment is shown. The power system 70 is connected to external terminals T3 and T4 on the output side of the power conversion device. The ground terminal TE is grounded.

[0073] Two inductors 62 and capacitors 61 are arranged between the nodes N3 and N4 on the output s...

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Abstract

A power converter includes: a plurality of external terminals; a grounded earth terminal; a power conversion circuit; a ground conductor; and a plurality of inductors. A plurality of nodes of the power conversion circuit are connected to the respective plurality of external terminals. The power conversion circuit performs power conversion by switching received power. A plurality of inductors are inserted between the plurality of external terminals and the plurality of nodes. Further, another inductor is inserted between the ground conductor and the earth terminal. In this way, there can be provided a power converter that provides a sufficient noise reduction effect also in a high frequency region.

Description

technical field [0001] The present invention relates to power conversion devices. Background technique [0002] In order to convert DC power generated by a solar power generation system or the like into AC power and interconnect it with the power system, a power conversion device (system interconnection inverter) is used. This power conversion device includes a boost converter that boosts a DC voltage, and an inverter that converts a DC voltage into an AC voltage. When switching elements such as boost converters and inverters are switched, the common mode voltage (neutral point potential) fluctuates. [0003] A single-phase inverter has an H-bridge structure formed of switching elements and is controlled, for example, by three-level PWM. Due to this control, the common mode voltage fluctuates. Fluctuations in the common mode voltage cause leakage current flowing to the earth (ground) and high-frequency noise. High-frequency noise is reduced by inserting a common mode cho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M3/155H02M7/5387
CPCH02M1/126H02M3/155H02M7/5387H02M1/123H02M1/12H02M7/003
Inventor 北田浩志
Owner MURATA MFG CO LTD
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