JP3391773B2 - Immittance conversion circuit and converter using the same - Google Patents

Immittance conversion circuit and converter using the same

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Publication number
JP3391773B2
JP3391773B2 JP2000279332A JP2000279332A JP3391773B2 JP 3391773 B2 JP3391773 B2 JP 3391773B2 JP 2000279332 A JP2000279332 A JP 2000279332A JP 2000279332 A JP2000279332 A JP 2000279332A JP 3391773 B2 JP3391773 B2 JP 3391773B2
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Japan
Prior art keywords
circuit
immittance conversion
conversion circuit
converter
immittance
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Expired - Fee Related
Application number
JP2000279332A
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Japanese (ja)
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JP2002095241A (en
Inventor
亮 下田屋
美知夫 伊藤
英樹 大口
誠 林
敏久 清水
道雄 玉手
宏之 高木
Original Assignee
株式会社関電工
敏久 清水
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Priority to JP2000279332A priority Critical patent/JP3391773B2/en
Publication of JP2002095241A publication Critical patent/JP2002095241A/en
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Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immittance conversion circuit and a converter incorporating the immittance conversion circuit.

[0002]

2. Description of the Related Art In recent years, a power conversion circuit having immittance conversion (abbreviation of impedance admittance conversion) characteristics has been studied. The immittance conversion characteristic is a conversion characteristic in which the impedance seen from the input side (transmission end) is proportional to the admittance on the output side (reception end), and the voltage source connected to the transmission end becomes a current source at the reception end. It also refers to the characteristic that a current source can be easily converted into a voltage source. The immittance conversion circuit includes a λ / 4 long distributed constant line and a lumped constant circuit. The following is known about the λ / 4 long distributed constant line.

Assuming that the voltage and current at the transmitting end and the receiving end in the distributed constant line when the line length x is λ / 4 are V 1 , V 2 , I 1 , and I 2 , respectively, the relationship is as follows. Like

[0004]

[Formula 1]

[0005] (1), the voltage V 1 of the sending end to the current I 2 of the receiving end, the current I 1 of the sending end is seen to be respectively converted into the voltage V 2 of the receiving end. If equation (1) is transformed into equation (2),

[0006]

[Formula 2]

It can be seen that the input impedance Z 1 is proportional to the load admittance Y 2 .

[0008]

However, each of them has drawbacks, and their applications to power conversion devices have been limited. The λ / 4 long distributed constant line can obtain the fundamental frequency and the odd-order harmonic immittance conversion characteristics satisfying the λ / 4 wavelength, but the line length becomes very long, and the lumped constant circuit is basically The immittance conversion characteristics other than the wave component cannot be obtained.

The present invention has been made in view of the above points, and an object thereof is to provide an immittance conversion circuit capable of reducing inverter loss and a converter incorporating the immittance conversion circuit.

[0010]

The present invention provides an immittance conversion circuit having a power transmitting terminal and a power receiving terminal at both ends,
Immittance conversion for performing immittance conversion of the fundamental wave component and the third harmonic component, with a π-type capacitor connected to both ends of the coil, and a coil connected in series to both ends of the coil It was a circuit. Further, a DC / DC converter and a D
A C / AC converter was constructed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a πLC circuit which is the immittance conversion circuit of the present invention. The transmission terminal 1 and the power receiving terminal 2 to connect the capacitor C to the π-type at both ends of the coil L 2 having both ends, further coil L 1 Re each Re husband in series to both ends of the coil L 2, was connected to the coil L 1 It is a composition. The values of the coils L 1 and L 2 and the capacitor C are arbitrary. This circuit has immittance conversion characteristics of the fundamental wave component and the third harmonic component, and when a square wave voltage is applied to the transmitting end, the receiving end current has a waveform similar to that of a λ / 4 long distributed constant line. Further, since the device is made up of only five elements, which are the two coils L 1 , the one coil L 2, and the two capacitors C, the device can be made compact and lightweight, which is a drawback of the conventional immittance conversion circuit. Can be supplemented.

In order to confirm the operation of the immittance conversion circuit of the present invention, the circuit shown in FIG. 2 was prepared and the operation was confirmed. The switching frequency of the voltage source inverter is 20 [k
Table 1 shows the circuit constants of the πLC circuit in [Hz]. The output voltage of the voltage source inverter is converted into a current source at the power receiving end due to the immittance conversion characteristic of the πLC circuit.

[0013]

[Table 1]

FIG. 3 shows the experimental results of the input voltage (V 1 ) and output current (I 2 ) waveforms of the πLC circuit. When a rectangular wave voltage as shown in Fig.3- (a) is applied, the output current waveform of the πLC circuit is shown in Fig.3- (b) due to the effects of the fundamental wave component and the third harmonic component.
A trapezoidal waveform like the following is obtained. Further, as shown in FIGS. 3- (a) and 3- (c), if the ratio of the amplitudes of the fundamental wave component and the third-order harmonic component is kept constant, then FIG. 3- (b) and FIG. Similar waveforms with different amplitudes shown in (d) are obtained. It was also confirmed that the amplitude of the output current does not change even if the magnitude of the load resistance is changed, so that it can be converted to a current source at the power receiving end.

The πLC circuit of the present invention is expected to be applied to various power conversion devices, but an application example to a current source power conversion device is shown below. Various types of low-voltage high-current DC power sources have been proposed so far, but problems still remain in terms of improvement of conversion efficiency and downsizing of the device. Therefore, FIG. 4 shows a circuit configuration of a DC / DC converter suitable for a low-voltage large-current power supply. This circuit is a voltage source inverter, πLC
It is composed of a circuit section and a rectification circuit section. The amplitude of the current supplied to the load is determined by the input impedance (Z 1 ) of the πLC circuit and the inverter output voltage (V 1 ). That is,
Without using a step-down transformer, it is possible to set the transmitting end side to a high voltage and small current and the receiving end side to a low voltage and large current simply by setting the magnitude of Z 1 . The simulation result is shown in FIG. Due to the output waveform of the πLC circuit considering the third harmonic component, a DC output with less ripple can be obtained, and miniaturization of the device can be expected due to the reduction of the capacity of the smoothing capacitor.

Generally, in a grid-connected inverter, it is better to control the current waveform when a sinusoidal current is supplied to the grid by a current source. The immittance conversion circuit that can easily convert the voltage source to the current source has already been applied, and it has been proved that stable grid interconnection is possible, but downsizing of the device, high efficiency and non-insulation There is no application example from the viewpoint of conversion.

As an application example from such a viewpoint, DC
The / AC converter is shown in FIG. This circuit is a high frequency PW
It is composed of an M inverter section, a πLC circuit section, a low frequency inverter (cycloconverter) section that operates at a commercial frequency, and a low-pass filter section. Due to the immittance conversion characteristic of the πLC circuit, the low-frequency inverter section can be regarded as a current source, so that stable power can be supplied regardless of the state of the system. The simulation result is shown in FIG. Further, since the commercial frequency alternating current can be generated in a non-insulated manner by the reactor with a center tap and the bidirectional switch, miniaturization and high efficiency of the device can be expected.

[0018]

As described above, the present invention provides a lumped-constant type immittance conversion circuit in which the fundamental wave component and the third harmonic component are taken into consideration.
It provides a C circuit. This circuit suppresses the peak value of the output voltage and current for the same output capacitance by considering the fundamental wave component and the third harmonic, thus compensating for the drawbacks of the conventional immittance conversion circuit and reducing the inverter loss. Various power conversion circuits such as DC / DC converters suitable for low-voltage large-current power supplies, DC / AC converters suitable for grid-connected inverters, etc. The application of is made possible.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an immittance conversion circuit of the present invention.

FIG. 2 is an experimental circuit configuration diagram using the immittance conversion circuit of the present invention.

FIG. 3 is a graph diagram of input voltage and output current waveforms of the experimental circuit of FIG. 2 using the immittance conversion circuit of the present invention.

FIG. 4 shows a DC / DC circuit using the immittance conversion circuit of the present invention.
It is a DC converter circuit block diagram.

5 is a graph of a simulation waveform of the DC / DC converter of FIG.

FIG. 6 shows a DC / DC using the immittance conversion circuit of the present invention.
It is an AC converter circuit block diagram.

7 is a graph of a simulation waveform of the DC / AC converter of FIG.

[Explanation of symbols]

1 power transmission end 2 power reception end L 1 , L 2 coil C capacitor

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification symbol FI H02M 7/5387 H02M 7/5387 Z (72) Inventor Michio Tamate 226-1 Setooka Setooka, Akiruno, Tokyo (72) Inventor Shimoda Ryo Ya 13-13 Matsufudai, Chigasaki-shi, Kanagawa (72) Inventor Hiroyuki Takagi 4-83-3 Shibaura, Minato-ku, Tokyo Incorporated company Kandenko (72) Inventor Michio Ito 4-chome, Shibaura, Minato-ku, Tokyo No.8-33 KANDENKO Co., Ltd. (56) References JP-A-8-305450 (JP, A) JP-A-2002-49428 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB) Name) H02M 1/12 H02M 3/155 H02M 5/297 H02M 7/48

Claims (3)

(57) [Claims]
1. In an immittance conversion circuit having a power transmission terminal and a power reception terminal at both ends, a π-type capacitor is connected to both ends of the coil, and further, a coil is connected to both ends of the coil in series. The fundamental wave component and 3
The second harmonic component is immittance converted,
Immittance conversion circuit.
2. A DC / DC converter comprising the immittance conversion circuit incorporated therein.
3. A DC / AC converter comprising the above immittance conversion circuit incorporated therein.
JP2000279332A 2000-09-14 2000-09-14 Immittance conversion circuit and converter using the same Expired - Fee Related JP3391773B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000279332A JP3391773B2 (en) 2000-09-14 2000-09-14 Immittance conversion circuit and converter using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000279332A JP3391773B2 (en) 2000-09-14 2000-09-14 Immittance conversion circuit and converter using the same

Publications (2)

Publication Number Publication Date
JP2002095241A JP2002095241A (en) 2002-03-29
JP3391773B2 true JP3391773B2 (en) 2003-03-31

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5695712B2 (en) * 2013-08-29 2015-04-08 住友電気工業株式会社 Transformer
JP5727561B2 (en) * 2013-08-29 2015-06-03 住友電気工業株式会社 Transformer
JP5695782B1 (en) * 2013-09-12 2015-04-08 住友電気工業株式会社 Transformer
JP6359950B2 (en) 2014-11-05 2018-07-18 住友電気工業株式会社 Transformer
JP6297963B2 (en) 2014-11-05 2018-03-20 住友電気工業株式会社 Transformer
JP2019012335A (en) 2017-06-29 2019-01-24 矢崎総業株式会社 Information setting device and electronic device

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