JP2013198343A - Power converter unit and power converter using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power converter unit capable of being used as a small and highly efficient power supply unit and to provide a power converter using the same.SOLUTION: The power converter unit includes a conversion circuit formed from a semiconductor switch and a capacitor; a driver of a semiconductor switch and a control circuit of the semiconductor switch, and the conversion circuit is connected with an output terminal. With such a configuration, an output of a flux power converter that obtains electric power using a magnetic flux generated by an electric current running between the conversion circuit and the output terminal is used as power supplies of the driver and the control circuit.

Description

  The present invention relates to a power converter unit and a power converter using the same, and more particularly to a power converter unit including a power supply circuit and a power converter using the power converter unit.

  When configuring a large-capacity power conversion device that performs power conversion between direct current and alternating current, a plurality of power converter units may be connected in series and used. For example, the power converter unit used for this purpose is configured as shown in FIG.

  In FIG. 2, each power converter unit 1 includes a conversion circuit composed of semiconductor switches 6 </ b> H and 6 </ b> L such as IGBTs connected in series and a cell capacitor 7, a semiconductor switch driver 2, a control circuit 5, and a power supply circuit. 10 is comprised.

  The power converter unit 1 is a unit cell unit, and a plurality of sets of unit cell output terminals 1P and 1N are connected in series with unit cell output terminals of other power converter units 1 (not shown) to form a large capacity power converter. Configure.

  A cell capacitor 7 is connected to both ends of the semiconductor switches 6H and 6L connected in series, one end of the capacitor is connected to the output terminal 1N, and a connection point of the semiconductor switches 6H and 6L is connected to the output terminal 1P to form a conversion circuit. doing.

  The semiconductor switch driver 2 includes semiconductor switches 6H and 6L, driver circuits 4H and 4L, and a DC / DC converter 3, and performs ignition control of the semiconductor switches 6H and 6L in response to a control signal from the control circuit 5. Yes. The driver 2 and the control circuit 5 operate by receiving power supply from the power supply circuit 10.

  As the power supply circuit 10, various circuit configurations can be adopted. For example, in the prior art described in Patent Document 1 and Patent Document 2, the terminal voltage of the cell capacitor 7 is smoothed to obtain a DC power supply.

  Specifically, the bleeder resistor 11 and the Zener diode 12 are connected in series to the cell capacitor 7, and the DCDC converter 14 in the first stage is operated by the terminal voltage of the smoothing capacitor 13 provided in parallel to the Zener diode 12.

JP 2010-035369 A JP 2006-074918 A

  The power converter unit 1 generally handles high voltages. For this reason, when such a circuit configuration is adopted, the DC voltage of the cell capacitor 7 is a high voltage. As a result, the power loss of the series circuit by the bleeder resistor 11 and the Zener diode 12 is large, which is disadvantageous in terms of power efficiency and occupied area.

  In view of the above, an object of the present invention is to provide a power converter unit that can be a small and highly efficient power supply device and a power conversion device using the power converter unit.

From the above, in the present invention, a power converter unit including a conversion circuit composed of a semiconductor switch and a capacitor, a driver for the semiconductor switch, and a control circuit for the semiconductor switch, the conversion circuit being connected to the output terminal In
The output of a magnetic flux power converter that obtains power using magnetic flux generated by the current flowing between the conversion circuit and the output terminal is used as a power source for the driver and the control circuit.

  Further, the output terminal is formed of a plate-like metal bus bar, and the magnetic flux power converter is a coil installed in the vicinity of the bus bar.

  In addition, the output terminal is formed by two plate-shaped metal busbars in which power flows into and out of the power converter unit, and the two busbars are opposed to each other, and the magnetic flux power converter is disposed between the busbars opposed to each other. It is characterized by being an installed coil.

  In addition, the output terminal is formed by two plate-shaped metal busbars where power flows into and out of the power converter unit, and is arranged so as to form a cylindrical space by the two busbars, and magnetic flux power conversion The vessel is a coil installed in a cylindrical space formed by two bus bars.

  The output terminal is formed of a plate-shaped metal bus bar, and the magnetic flux power converter is a coil installed so as to surround the bus bar.

From the above, in the present invention, a power converter unit including a conversion circuit composed of a semiconductor switch and a capacitor, a driver for the semiconductor switch, and a control circuit for the semiconductor switch, the conversion circuit being connected to the output terminal In a power converter configured by connecting a plurality of these in series,
The output terminals of adjacent power converter units are connected by conductors,
Each power converter unit uses the output of a magnetic flux power converter that obtains power by using a magnetic flux generated by a current flowing between a conversion circuit and the conductor as a power source for a driver and a control circuit. To do.

  The conductor is formed of a plate-like metal bus bar, and the magnetic flux power converter is a coil installed in the vicinity of the bus bar.

  In addition, the conductor is formed by two plate-shaped metal busbars where power flows into and out of the power converter unit, the two busbars are arranged opposite to each other, and the magnetic flux power converter is installed between the opposed busbars. It is characterized by being made into the coil which was made.

  In addition, the conductor is formed of two plate-shaped metal bus bars from which electric power flows into and out of the power converter unit, and is arranged so as to form a cylindrical space by the two bus bars, and the magnetic flux power converter Is a coil installed in a cylindrical space formed by two bus bars.

  The conductor is formed of a plate-shaped metal bus bar, and the magnetic flux power converter is a coil installed so as to surround the bus bar.

  According to the present invention, in a unit cell or cascade-connected power conversion device, the degree of freedom in the arrangement of the power supply is improved, so that the unit cell or cascade-connected conversion device can be reduced in size. Further, by freely setting the output voltage, power loss can be reduced, and a highly efficient and inexpensive power supply can be provided.

The figure which shows the whole structure of the power converter unit of this invention. The figure which shows the whole structure of the conventional power converter unit. The figure which shows the whole structure of the power converter unit of Example 1. FIG. The figure which shows the whole structure of the power converter unit of Example 2. FIG. The figure which shows the whole structure of the power converter unit of Example 3. FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  Since the cascade-connected power conversion devices are a complex of unit cell units (power converter units), in the following description, an example of the unit cell unit 1 will be described. FIG. 1 shows the overall configuration of a unit cell unit 1 of the present invention.

  The unit cell unit 1 includes a high-side IGBT 4H and a low-side IGBT 4L that are main switches, a rectifier capacitor 7, an IGBT drive control circuit 5, an IGBT driver circuit 2, and a power supply circuit 8. This basic configuration is different in that the power supply circuit is changed from 10 to 8.

  The present invention is characterized in that the power supply circuit 8 for operating the IGBT drive control circuit 5 and the IGBT driver circuit 2 uses the magnetic flux generated from the unit cell unit 1 to obtain power. Here, since a large alternating current flows through the unit cell output terminals 1P and 1N of the cell unit 1, a power source is used by utilizing a magnetic flux generated from the large current.

  Specifically, in order to effectively use the magnetic flux, the unit cell output terminals 1P and 1N are configured by a metal plate (busbar) 20 such as a copper plate. The power supply circuit 8 includes a magnetic flux power converter 9 that converts magnetic flux into electric power.

  The magnetic flux generated from the metal plate (busbar) 20 is converted into a voltage by the magnetic flux power converter 9 in the power supply device 8 and used as a power source for operating the IGBT drive control circuit 5 and the IGBT driver circuit 2. . The magnetic flux power converter 9 is a coil provided close to the bus bar 20, for example.

  FIG. 3 shows a configuration example of the power converter unit according to the present invention. In the example of the figure, the output terminals 1P and 1N of the unit cell unit 1 are constituted by bus bars 20. Further, the conductor between the output terminals of the adjacent unit cell units 1 can also be configured as a bus bar 20 like the terminals 1P and 1N. In the case of the present invention, the output terminal is not limited to the outlet portion of the power converter unit, but in a broad concept, it represents the metal conductor portion to the adjacent unit cell unit.

  The unit cell unit 1 shown in FIG. 3 contains the IGBT 4, the rectifier capacitor 7, the IGBT drive control circuit 5, the IGBT driver circuit 2, and a part of the power supply circuit 8 shown in FIG. 1. Of the power supply circuit 8, the magnetic flux power converter 9 is shown outside the unit cell unit 1, but the magnetic flux power converter 9 itself can be housed inside the unit cell unit 1.

  The magnetic flux power converter 9 is, for example, a coil. A coil wound in a stacking direction in the height direction is housed in a cubic housing body 21, and the housing body 21 is fitted between the output terminals 1 </ b> P and 1 </ b> N of the unit cell units 1 arranged to face each other.

  Two reciprocating metal plates (bus bars) 20 on the power entry side and the exit side are taken out in parallel from the unit cell unit 1. By placing the magnetic flux power converter 9 of the power supply device 8 in the space or gap between the bus bars 20, the space or gap can be used effectively, and the unit cell unit can be downsized.

  In addition, by placing the magnetic flux power converter 9 between the two reciprocating metal plates (busbars) 20, a magnetic flux approximately twice that of the busbars 20 on one side can be obtained, so that the power supply efficiency is improved.

  Note that I and φ indicated by arrows in FIG. 3 indicate the directions of current and magnetic flux.

  In FIG. 4, the magnetic flux power converter 9 is arranged in the space or gap between the bus bars 20 arranged in a straight line. On the other hand, in Example 2 of FIG. 5, the cylindrical space was formed by the two bus bars 20, and the cylindrical storage bodies 22 were individually arranged. A coil is wound inside or outside the cylindrical storage body 22.

  By processing a part of the bus bar 20 so as to form a cylindrical space, the magnetic flux generated from the bus bar 20 is concentrated toward the center. Thereby, the further efficiency improvement of the power supply device 20 can be aimed at.

  The embodiment of FIGS. 3 and 4 is effective when the linear opposing arrangement portion of the bus bar 20 can be sufficiently secured, but it is effective to adopt the configuration of FIG. 6 in the case where the distance between them cannot be obtained. is there.

  Here, the magnetic flux power converter 9 is disposed in the conductor portion 20H between the output terminals of the adjacent unit cell units 1. Power can be supplied by installing the magnetic flux power converter 9 so as to surround the bus bar 20H.

  In the coil used as the magnetic flux power converter 9 in the present invention, power is extracted from between the winding start point and the winding end point, and the driver 2 and the control are provided via the rectifier circuit in the power supply circuit 8 and the like. Power is supplied to the circuit 5.

1: Unit cell unit 1P, 1N: Unit cell output terminal 2: IGBT driver unit 3: DCDC converter 4H, 4L: Gate driver circuit 5: Cell control circuit 6H, 6L: IGBT
7: Cell capacitor 8, 10: Power supply device 9: Magnetic flux power converter 11: Breeder resistor 12: Zener diode 13: Smoothing capacitor 14: DCDC converter 20: Metal plate for unit cell output terminal (Busba)

Claims (10)

In a power converter unit comprising a conversion circuit composed of a semiconductor switch and a capacitor, a driver for the semiconductor switch, and a control circuit for the semiconductor switch, the conversion circuit being connected to an output terminal,
A power converter unit that uses, as a power source for the driver and the control circuit, an output of a magnetic flux power converter that obtains power by using magnetic flux generated by a current flowing between the conversion circuit and the output terminal. The power converter unit according to claim 1,
The power converter unit is characterized in that the output terminal is formed of a plate-shaped metal bus bar, and the magnetic flux power converter is a coil installed close to the bus bar. The power converter unit according to claim 1 or 2,
The output terminal is formed of two plate-shaped metal busbars in which power flows into and out of the power converter unit, the two busbars are opposed to each other, and the magnetic flux power converter is disposed between the busbars opposed to each other. A power converter unit, characterized in that the coil is installed in a coil. The power converter unit according to claim 1 or 2,
The output terminal is formed of two plate-shaped metal bus bars in which electric power flows into and out of the power converter unit, and is arranged so as to form a cylindrical space by the two bus bars, and the magnetic flux power The power converter unit is characterized in that the converter is a coil installed in a cylindrical space formed by two bus bars. The power converter unit according to claim 1 or 2,
The power converter unit, wherein the output terminal is formed of a plate-shaped metal bus bar, and the magnetic flux power converter is a coil installed so as to surround the bus bar. A conversion circuit comprising a semiconductor switch and a capacitor, a driver for the semiconductor switch, and a control circuit for the semiconductor switch, wherein the conversion circuit is configured by connecting a plurality of power converter units connected to an output terminal in series. In the converted power converter,
The output terminals of the adjacent power converter units are connected by a conductor,
Each of the power converter units uses an output of a magnetic flux power converter that obtains power by using a magnetic flux generated by a current flowing between the conversion circuit and the conductor as a power source for the driver and the control circuit. The power converter characterized by this. The power conversion device according to claim 6, wherein
The conductor is formed of a plate-shaped metal bus bar, and the magnetic flux power converter is a coil installed close to the bus bar. In the power converter device of Claim 6 or Claim 7,
The conductor is formed by two plate-shaped metal busbars in which power flows into and out of the power converter unit, the two busbars are opposed to each other, and the magnetic flux power converter is disposed between the busbars opposed to each other. A power converter characterized by being an installed coil. In the power converter device of Claim 6 or Claim 7,
The conductor is formed by two plate-shaped metal busbars in which electric power flows into and out of the power converter unit, and is disposed so as to form a cylindrical space by the two busbars, and the magnetic flux power conversion The power converter is a coil installed in a cylindrical space formed by two bus bars. In the power converter device of Claim 6 or Claim 7,
The power converter is characterized in that the conductor is formed of a metal plate bus bar, and the magnetic flux power converter is a coil installed so as to surround the bus bar.

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