JP2005287251A - Rectifying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rectifying device capable of reducing generation of harmonic waves. <P>SOLUTION: A phase-shifting transformer 4 generates two pairs of three-phase VAC voltage having phase difference of 20° from a three-phase VAC voltage supplied from a three-phase AC power supply 2. The two pairs of three-phase AC voltage are respectively subjected to full wave rectification by a first to a third three-phase full wave rectifying circuits 5A, 5B, 5C. When the outputs of the first to the third three-phase full wave rectifying circuits 5A, 5B, 5C are rectified by a three-phase bridge rectifying circuit 7 through three-phase interphase reactors 6A, 6B on positive and negative pole sides, so that commutation in the three-phase bridge rectifying circuit 7 is performed at the point where 20°, as the interval of commutation of the first to the third three-phase full wave rectifying circuits 5A, 5B, 5C, is equally divided into three, so that a 54-stage stepwise alternating current is inputted from the three-phase AC power supply 2, thus reducing the harmonic waves included in the three-phase VAC from the three-phase AC power supply 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rectifier that rectifies three-phase alternating current into direct current, and more particularly, to a rectifier that reduces the generation of harmonic components on the alternating current side.

  In the present invention, the term “connection” includes an electrical connection.

  In a rectifier that rectifies three-phase alternating current into direct current, a multiphase alternating current circuit is configured in order to reduce harmonics generated on the alternating current side. The polyphase AC circuit has a configuration using an insulating transformer and a configuration using a phase shift transformer in order to generate a polyphase AC. When there is no need to insulate the AC side and the DC side and it is desired to reduce the size and weight, a multiphase AC circuit is configured using a phase shift transformer.

  The rectifier of the first conventional technique includes a phase shift converter, a three-phase full-wave rectifier circuit, and an interphase reactor, and the phase shift converter is connected to a three-phase AC power source and is connected to the three-phase AC power source. Two sets of three-phase alternating currents having a phase difference of 30 ° are generated from the supplied three-phase alternating currents. The three-phase full-wave rectifier circuit is constituted by a diode, and full-wave rectifies each of two sets of three-phase alternating currents generated by the phase shift transformer. The positive and negative sides of the three-phase full-wave rectifier circuit are connected by an interphase transformer, and the midpoint of each interphase transformer is connected to a DC load (for example, see Non-Patent Document 1).

  In such a rectifier, 12-pulse rectification is performed. Therefore, the inflow current from the three-phase AC power source to the rectifier has a 12-step staircase waveform. Therefore, 12m ± 1 (m is a positive integer) order harmonic is generated, and the amount of harmonics of the voltage waveform and current waveform, in other words, the total distortion rate exceeds 10 percent (%). Since the total distortion rate is 15.22% as a logical value, the amount of the harmonics may not be within the regulation value in some cases, and it is necessary to add a harmonic filter.

  In view of such a problem, in the rectifier of the second prior art, a secondary winding is provided in the interphase transformer of the first prior art rectifier, an inverter is connected to the secondary winding, and the inverter Harmonics are reduced by injecting a current that cancels the harmonic current (see, for example, Non-Patent Document 2).

  As a third conventional technique, the phase difference between two sets of three-phase AC generated by the phase shift converter of the rectifier of the first conventional technique is expanded to 40 °, and further, an interphase transformer, a DC load, There is a rectifier provided with a switching diode for tapping (see, for example, Non-Patent Document 3).

“Power Electronics Handbook” supervised by Koji Imai, 2002, R & D Planning Sewan Choi, Prasad Enjeti, Hong-Hee Lee, Ira Pitel: “New Active Interphase Reactor for 12-Pulse rectifiers Provides Clean Power Utility Interface”, IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, NOVEMBER / DECEMBER 1996, VOL. 32, NO. 6 Oguchi / Yamada: “Improvement of input current waveform of non-insulated transformer-coupled dual three-phase diode bridge rectifier circuit with partial capacitance”, D. Theory, 1995, Vol. 115, No. 9, pp 1196, 1197

  In the rectifier of the second prior art, an inverter for injecting a current that cancels the harmonic current into the secondary winding of the interphase transformer is required. For this reason, a transistor or the like for constituting the inverter is required. Active elements and control circuits are required. Therefore, there is a problem that the apparatus becomes complicated. Active elements such as transistors are more prone to failure than diodes. Therefore, there is a demand for a rectifier circuit that has a simple device configuration and can rectify three-phase alternating current into direct current without using a control circuit.

  In the rectifier of the third prior art, 18-pulse rectification is equivalently performed. In 18-pulse rectification, 18m ± 1st order harmonics are generated, and even in this case, the total distortion rate exceeds 10%. Specifically, the total distortion rate is 10.12% as a logical value. .

  When a reactor is installed on the AC side in order to reduce harmonics, there is a problem that it is difficult to obtain an effect when the impedance of the system is high, and the size and weight of the device are increased. In addition, in order to reduce harmonics, when installing an LC filter using a capacitor in addition to a reactor on the AC side, or installing a passive filter for removing a specific frequency using LC resonance on the AC side, the capacitor is installed in the rectifier. In addition, there is a problem that the power factor is decreased, and the size and weight of the device are increased.

  An object of the present invention is to provide a rectifier that can suppress the increase in dimensions and weight as much as possible and reduce the generation of harmonics.

The present invention is connected to a three-phase AC power source, so that three sets of three-phase AC voltages having a phase difference of 20 ° are obtained from the three-phase AC voltage supplied from the three-phase AC power source. A phase-shifting transformer that generates at least two sets of three-phase AC voltages based on the voltage;
Three three-phase full-wave rectifier circuits each full-wave rectifying three sets of three-phase AC voltages each having a phase difference of 20 ° including the three-phase AC voltage generated by the phase-shifting transformer;
Three three-phase full-wave rectifier circuits for full-wave rectifying each of the three sets of three-phase AC voltages generated by the phase-shifting transformer;
Two primary windings and secondary windings have first to third winding portions wound respectively, and each primary winding wound by the first to third winding portions is staggered. A positive-phase three-phase reactor in which the positive poles of the DC outputs of the three three-phase full-wave rectifier circuits are connected to each other at the neutral point of the staggered connection via primary windings that are staggered;
Each of the primary windings wound around the fourth to sixth winding portions has a staggered connection, and has four to sixth winding portions around which the two primary windings and the secondary winding are wound. And three-phase full-wave rectifier DC output negative electrodes are connected to each other at the neutral point of the zigzag connection via the primary winding connected to the zigzag connection, respectively.
It has three AC connection terminals connected to the secondary winding of the positive-phase and negative-phase three-phase reactors, and the negative pole of the DC output at the neutral point of the staggered connection by the primary winding of the positive-phase three-phase reactors A three-phase bridge rectifier circuit in which the positive electrode of the direct current output is connected to the neutral point of the staggered connection by the primary winding of the negative-phase side three-phase reactor,
Including a DC reactor,
The secondary windings of the first and fourth winding sections are connected in series, the secondary windings of the second and fifth winding sections are connected in series, and the secondary windings of the third and sixth winding sections Lines are connected in series, one end of the three series-connected secondary winding sets are connected to each other, and the other end of the three series-connected secondary winding sets is Connected to the three AC connection terminals of the three-phase bridge rectifier circuit,
Between the neutral point of the staggered connection by the primary winding of the three-phase reactor on the positive side and the negative pole of the DC output of the three-phase bridge rectifier circuit, or in the staggered connection by the primary winding of the three-phase reactor on the negative side The rectifier is characterized in that a direct current reactor and a direct current load connected in series to the direct current reactor are connected between the sex point and the negative electrode of the direct current output of the three-phase bridge rectifier circuit.

  According to the present invention, three sets of three-phase AC voltages having a phase difference of 20 ° including the three-phase AC voltages generated by the phase-shifting transformer are respectively converted into full-wave by three three-phase full-wave rectifier circuits. Rectify. In three three-phase full-wave rectifier circuits, commutation occurs 18 times during an electrical angle of 2π, in other words, commutation occurs every 20 °, thereby rectifying the three-phase AC voltage by 18 pulses. Can do. By connecting the positive and negative electrodes of the DC output of each three-phase full-wave rectifier circuit to the positive-phase and negative-phase three-phase reactors, respectively, and rectifying the output voltage of the three-phase reactor by the three-phase bridge rectifier circuit The waveform of the voltage induced in the secondary winding of the three-phase reactor on the positive electrode side and the negative electrode side is sawtooth, and the commutation in the three-phase bridge rectifier circuit is the interval of commutation in the three-phase full-wave rectifier circuit. It is performed at an equally divided point obtained by dividing a certain 20 ° into three equal parts.

  The three-phase bridge rectifier circuit rectifies a voltage having a frequency component that is six times the frequency of the AC voltage supplied from the AC power source extracted by the positive-phase and negative-phase side three-phase reactors, and has a frequency that is 36 times the power frequency. The component voltage can be applied to a DC load connected in series to the three-phase full-wave rectifier bridge circuit. Therefore, the waveform of the DC voltage applied to this DC load is the waveform of the DC voltage rectified by the three-phase full-wave rectifier circuit and the waveform of the voltage between the negative electrode and the positive electrode of the DC output of the three-phase bridge rectifier circuit. The waveform is obtained by adding. Therefore, the waveform of the DC voltage applied to the DC load is a waveform smoothed more than the DC voltage (18 pulses) output from the three-phase full-wave rectifier circuit, and is output from the three-phase full-wave rectifier circuit. It has a ripple with a period of 1/3 of the ripple of the DC voltage. That is, the AC voltage supplied from the power source is equivalently 54 pulse rectified by the rectifier of the present invention.

  In the present invention, the ripple of the DC voltage applied to the DC load can be reduced, and the secondary winding of the positive-phase and negative-side three-phase reactors has the same magnitude as the load current flowing through the DC load. An alternating current having a frequency six times the power frequency flows. As a result, the primary current balance of each three-phase reactor can be changed, and the input current to each three-phase reactor becomes a direct current pulsating at a frequency six times the power supply frequency. When the input terminal current of the three-phase full-wave rectifier circuit is synthesized by a phase shift transformer, it becomes a 54-step AC current waveform, that is, 54 pulses are rectified. As described above, the waveform of the three-phase alternating current input from the three-phase alternating current power supply can be made closer to a sine wave, so that harmonics included in the three-phase alternating current supplied from the three-phase alternating current power supply can be reduced. That is, the generation of harmonics can be reduced as compared with the 18-pulse rectifier of the third prior art.

  The rectifying element that constitutes the three-phase full-wave rectifier circuit and the three-phase bridge rectifier circuit can be composed of only passive elements such as diodes. Since passive elements such as diodes are not easily broken by overcurrent, the reliability of the device is improved and the maintenance and management of the device is facilitated.

  Compared with the 12-pulse rectifier of the first prior art, the rectifier of the present invention is a three-phase transformer having a secondary winding, and a three-phase bridge rectifier circuit is added. Therefore, the size of the apparatus is not increased.

  Further, since the DC reactor and the DC load are connected in series, the inrush current flowing through the DC load can be suppressed, the DC current can be smoothed, and current interruption can be prevented.

In addition, the present invention is connected to a three-phase AC power source, so that three sets of three-phase AC voltages having a phase difference of 20 ° can be obtained from the three-phase AC voltage supplied from the three-phase AC power source. A phase-shifting transformer that generates at least two sets of three-phase AC voltages based on the AC voltage;
First to third three-phase full-wave rectifier circuits that full-wave rectify three sets of three-phase AC voltages each having a phase difference of 20 ° including the three-phase AC voltage generated by the phase-shifting transformer;
A first winding connected to the first three-phase full-wave rectifier circuit, one end of which is connected to the positive electrode of the DC output of the first three-phase full-wave rectifier circuit, and the first three-phase full-wave rectifier circuit; A first current balancer having a second winding, one end of which is connected to the negative electrode of the DC output and having a polarity in which the magnetic flux generated by the flow of current cancels the magnetic flux generated by the first winding;
A third winding connected to the second three-phase full-wave rectifier circuit, one end of which is connected to the positive electrode of the DC output of the second three-phase full-wave rectifier circuit, and a second three-phase full-wave rectifier circuit; A second current balancer having a fourth winding having one end connected to the negative electrode of the DC output and having a polarity in which the magnetic flux generated by the flow of current cancels the magnetic flux generated by the third winding;
There are first to third winding portions around which the primary winding and the secondary winding are wound, and each of the primary winding and the secondary winding of each winding portion has two windings. A three-phase reactor that is composed of wires and is staggered, and the other is Y-connected,
A three-phase bridge rectifier having three AC connection terminals connected to each other at a neutral point of a staggered connection or a Y connection by a secondary winding of a three-phase interphase reactor;
Including a DC reactor connected in series with the DC load,
The other ends of the first and third windings and the positive electrode of the DC output of the third three-phase full-wave rectifier circuit are the primary windings that are farthest from the neutral point of the primary winding of the three-phase reactor. Are connected to each other at the neutral point, the neutral point is connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit, the other ends of the second and fourth windings and the second The three-phase full-wave rectifier circuit DC output negative electrode is connected to each other and connected to the three-phase bridge rectifier circuit DC output positive electrode, and the neutral point and the three-phase bridge rectifier circuit DC output negative electrode Or a connection portion where the other ends of the second and fourth windings and the negative electrode of the DC output of the third three-phase full-wave rectifier circuit and the positive electrode of the DC output of the three-phase bridge rectifier circuit are connected to each other. DC reactor and DC load connected in series with this DC reactor Connected thereto,
Alternatively, the other ends of the first and third windings and the positive electrode of the direct current output of the third three-phase full-wave rectifier circuit are connected to each other and connected to the negative electrode of the direct current output of the three-phase bridge rectifier circuit, The other end of the fourth winding and the negative pole of the DC output of the third three-phase full-wave rectifier circuit are connected to one end of the primary winding that is farthest from the neutral point of the secondary winding of the three-phase reactor. The neutral point is connected to each other at the neutral point, and the neutral point is connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit. The neutral point and the positive electrode of the DC output of the three-phase bridge rectifier circuit Or the other end of the first and third windings and the positive electrode of the direct current output of the third three-phase full-wave rectifier circuit and the positive electrode of the direct current output of the three-phase bridge rectifier circuit The rectifier is characterized in that a DC load is connected between

In the present invention, the first to third winding portions of the three-phase interphase reactor each have one primary winding and two secondary windings,
One secondary winding of the first winding part and one secondary winding of the second winding part are connected in series, and the other secondary winding and third winding part of the second winding part Is connected in series, one secondary winding of the third winding part and the other secondary winding of the first winding part are connected in series, and three series One end of a set of secondary windings connected to each other is connected to each other and staggered,
The other ends of the first and third windings and the positive electrode of the DC output of the third three-phase full-wave rectifier circuit are the primary windings that are farthest from the neutral point of the primary winding of the three-phase reactor. Are connected to each other at the neutral point, the neutral point is connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit, the other ends of the second and fourth windings and the second The three-phase full-wave rectifier circuit DC output negative electrode is connected to the positive electrode of the three-phase bridge rectifier circuit DC output, the other end of the second and fourth windings and the third three-phase A direct current reactor and a direct current load connected in series with this direct current reactor are connected between the connection part where the negative electrode of the direct current output of the full wave rectifier circuit and the positive electrode of the direct current output of the three-phase bridge rectifier circuit are connected to each other. It is characterized by being.

In the present invention, the first to third winding portions of the three-phase interphase reactor each include two primary windings and one secondary winding,
One primary winding of the first winding part and one primary winding of the second winding part are connected in series, and the other primary winding and the third winding part of the second winding part Is connected in series, one primary winding of the third winding part and the other primary winding of the first winding part are connected in series, and three series windings are connected. One end of a set of secondary windings connected to each other is connected to each other and staggered,
The other ends of the first and third windings and the positive electrode of the DC output of the third three-phase full-wave rectifier circuit are the primary windings that are farthest from the neutral point of the primary winding of the three-phase reactor. Are connected to each other at the neutral point, the neutral point is connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit, the other ends of the second and fourth windings and the second The three-phase full-wave rectifier circuit DC output negative electrode is connected to the positive electrode of the three-phase bridge rectifier circuit DC output, the other end of the second and fourth windings and the third three-phase A direct current reactor and a direct current load connected in series with this direct current reactor are connected between the connection part where the negative electrode of the direct current output of the full wave rectifier circuit and the positive electrode of the direct current output of the three-phase bridge rectifier circuit are connected to each other. It is characterized by being.

  According to the present invention, three sets of three-phase AC voltages having a phase difference of 20 ° including the three-phase AC voltages generated by the phase-shifting transformer are respectively converted into full-wave by three three-phase full-wave rectifier circuits. Rectify. In three three-phase full-wave rectifier circuits, commutation occurs 18 times during an electrical angle of 2π, in other words, commutation occurs every 20 °, thereby rectifying the three-phase AC voltage by 18 pulses. Can do. A current balancer is connected to at least any two of the three-phase full-wave rectifier circuits. Since the first and second current balancers have the first winding and the second winding having a polarity in which the magnetic flux generated by the current flow cancels the magnetic flux generated by the first winding. The DC outputs of the three-phase full-wave rectifier circuit interfere with each other, and the DC output current is prevented from fluctuating greatly with the passage of time. The voltage between the other end of the first winding and the other end of the second winding of the first current balancer is determined when the first winding and the second winding are viewed from the DC output end of the first three-phase full-wave rectifier circuit. Since the polarities cancel each other out, they are equal to the DC output voltage of the first three-phase full-wave rectifier circuit. The voltage between the other end of the third winding and the other end of the fourth winding of the second current balancer is such that the third winding and the fourth winding are connected to the DC output terminal of the second three-phase full-wave rectifier circuit. Since the polarities are such that the voltages cancel each other, they are equal to the DC output voltage of the second three-phase full-wave rectifier circuit.

  The direct current output positive or negative electrode of each three-phase full-wave rectifier circuit is connected to the three-phase reactor via the first and second current balancers, and the three-phase bridge rectifier circuit outputs the output voltage of the three-phase reactor. By rectifying, the waveform of the voltage induced in the secondary winding of the reactor between the three-phase phases becomes a sawtooth shape, and the commutation in the three-phase bridge rectifier circuit is the commutation interval of the three-phase full-wave rectifier circuit. It is performed at an equally divided point obtained by dividing 20 ° into three equal parts.

  The three-phase bridge rectifier circuit rectifies a voltage having a frequency component that is six times the frequency of the AC voltage supplied from the AC power supply extracted by the reactor between the three-phase phases, It can be applied to a DC load connected in series to a phase full wave rectifier bridge circuit. Therefore, the waveform of the DC voltage applied to this DC load is the waveform of the DC voltage rectified by the three-phase full-wave rectifier circuit and the waveform of the voltage between the negative electrode and the positive electrode of the DC output of the three-phase bridge rectifier circuit. The waveform is obtained by adding. Therefore, the waveform of the DC voltage applied to the DC load is a waveform smoothed more than the DC voltage (18 pulses) output from the three-phase full-wave rectifier circuit, and is output from the three-phase full-wave rectifier circuit. It has a ripple with a period of 1/3 of the ripple of the DC voltage. That is, the AC voltage supplied from the power source is equivalently 54 pulse rectified by the rectifier of the present invention.

  In the present invention, the ripple of the DC voltage applied to the DC load can be reduced, and the secondary winding of the three-phase reactor has the same magnitude as the load current flowing in the DC load and 6 times the AC power supply frequency. An alternating current of a frequency flows. As a result, the primary current balance of each three-phase reactor can be changed, and the input current to the three-phase reactor becomes a direct current pulsating at a frequency six times the power supply frequency. When the input terminal current of the three-phase full-wave rectifier circuit is synthesized by a phase shift transformer, it becomes a 54-step AC current waveform, that is, 54 pulses are rectified. As described above, the waveform of the three-phase alternating current input from the three-phase alternating current power supply can be made closer to a sine wave, so that harmonics included in the three-phase alternating current supplied from the three-phase alternating current power supply can be reduced. That is, the generation of harmonics can be reduced as compared with the 18-pulse rectifier of the third prior art.

  The rectifying element that constitutes the three-phase full-wave rectifier circuit and the three-phase bridge rectifier circuit can be composed of only passive elements such as diodes. Since passive elements such as diodes are not easily broken by overcurrent, the reliability of the device is improved and the maintenance and management of the device is facilitated.

  Compared with the 12-pulse rectifier according to the first prior art, the rectifier according to the present invention is a three-phase bridge rectifier circuit in which an interphase transformer is a three-phase transformer having a secondary winding. Since only two current balancers having one winding need be added, the apparatus is not increased in size.

  Further, since the DC reactor and the DC load are connected in series, the inrush current flowing through the DC load can be suppressed, the DC current can be smoothed, and current interruption can be prevented.

In addition, the present invention is connected to a three-phase AC power source, so that three sets of three-phase AC voltages having a phase difference of 20 ° can be obtained from the three-phase AC voltage supplied from the three-phase AC power source. A phase-shifting transformer that generates at least two sets of three-phase AC voltages based on the AC voltage;
First to third three-phase AC voltages having three AC connection terminals, including three-phase AC voltages generated by a phase-shifting transformer, and full-wave rectifying three sets of three-phase AC voltages each having a phase difference of 20 ° A three-phase full-wave rectifier circuit,
On the input side of the first three-phase full-wave rectifier circuit, the magnetic flux that is connected to each of the three AC connection terminals and that is generated when a current flows in one winding cancels the magnetic flux that is generated by the other windings. A first current balancer having first to third windings of matching polarity;
On the input side of the second three-phase full-wave rectifier circuit, the magnetic flux that is connected to each of the three AC connection terminals and that is generated when a current flows in one winding cancels out the magnetic flux that is generated by the other windings. A second current balancer having first to third windings of matching polarity;
There are first to third winding portions around which the primary winding and the secondary winding are wound, and either one of the primary winding or the secondary winding of each winding portion has two windings. A three-phase reactor that is composed of wires and is staggered, and the other is Y-connected,
A three-phase bridge rectifier having three AC connection terminals connected to each other via the secondary windings of the first to third winding portions of the three-phase reactor,
Including a DC reactor connected in series with the DC load,
The positive poles of the DC outputs of the first to third three-phase full-wave rectifier circuits are connected to each other via the primary windings of the reactors between the three-phase phases, and the neutral point of the connection by each primary winding is Connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit, the negative electrode of the DC output of the first to third three-phase full-wave rectifier circuits is connected to the positive electrode of the DC output of the three-phase bridge rectifier circuit, A DC load is connected between the sex point and the negative electrode of the DC output of the three-phase bridge rectifier circuit, or between the negative electrode output terminal and the positive electrode of the DC output of the three-phase bridge rectifier circuit.
Alternatively, the positive electrode of the DC output of the first to third three-phase full-wave rectifier circuits is connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit, and the DC output of the first to third three-phase full-wave rectifier circuits The negative electrodes are connected to each other through the primary windings of the reactors between the three-phase phases, and the neutral point of the connection by each primary winding is connected to the positive electrode of the DC output of the three-phase bridge rectifier circuit. Rectification characterized in that a DC load is connected between the sex point and the positive electrode of the DC output of the three-phase bridge rectifier circuit, or between the positive electrode output terminal and the positive electrode of the DC output of the three-phase bridge rectifier circuit. Device.

  According to the present invention, three sets of three-phase AC voltages having a phase difference of 20 ° including the three-phase AC voltages generated by the phase-shifting transformer are respectively converted into full-wave by three three-phase full-wave rectifier circuits. Rectify. In three three-phase full-wave rectifier circuits, commutation occurs 18 times during an electrical angle of 2π, in other words, commutation occurs every 20 °, thereby rectifying the three-phase AC voltage by 18 pulses. Can do. A current balancer is connected to at least any two of the three-phase full-wave rectifier circuits. Since the first and second current balancers have one winding and another winding having a polarity in which the magnetic flux generated by the flow of current cancels the magnetic flux generated by the winding. The AC input voltages to the phase full-wave rectifier circuit interfere with each other, so that the DC outputs of the three-phase full-wave rectifier circuit interfere with each other, and the DC output current is prevented from fluctuating greatly over time. The

  The direct current output positive or negative electrode of each three-phase full-wave rectifier circuit is connected to the three-phase reactor via the first and second current balancers, and the three-phase bridge rectifier circuit outputs the output voltage of the three-phase reactor. By rectifying, the waveform of the voltage induced in the secondary winding of the reactor between the three-phase phases becomes a sawtooth shape, and the commutation in the three-phase bridge rectifier circuit is the commutation interval of the three-phase full-wave rectifier circuit. It is performed at an equally divided point obtained by dividing 20 ° into three equal parts.

  The three-phase bridge rectifier circuit rectifies a voltage having a frequency component that is six times the frequency of the AC voltage supplied from the AC power supply extracted by the reactor between the three-phase phases, It can be applied to a DC load connected in series to a phase full wave rectifier bridge circuit. Therefore, the waveform of the DC voltage applied to this DC load is the waveform of the DC voltage rectified by the three-phase full-wave rectifier circuit and the waveform of the voltage between the negative electrode and the positive electrode of the DC output of the three-phase bridge rectifier circuit. The waveform is obtained by adding. Therefore, the waveform of the DC voltage applied to the DC load is a waveform smoothed more than the DC voltage (18 pulses) output from the three-phase full-wave rectifier circuit, and is output from the three-phase full-wave rectifier circuit. It has a ripple with a period of 1/3 of the ripple of the DC voltage. That is, the AC voltage supplied from the power source is equivalently 54 pulse rectified by the rectifier of the present invention.

  In the present invention, the ripple of the DC voltage applied to the DC load can be reduced, and the secondary winding of the three-phase reactor has the same magnitude as the load current flowing in the DC load and 6 times the AC power supply frequency. An alternating current of a frequency flows. As a result, the primary current balance of each three-phase reactor can be changed, and the input current to the three-phase reactor becomes a direct current pulsating at a frequency six times the power supply frequency. When the input terminal current of the three-phase full-wave rectifier circuit is synthesized by a phase shift transformer, it becomes a 54-step AC current waveform, that is, 54 pulses are rectified. As described above, the waveform of the three-phase alternating current input from the three-phase alternating current power supply can be made closer to a sine wave, so that harmonics included in the three-phase alternating current supplied from the three-phase alternating current power supply can be reduced. That is, the generation of harmonics can be reduced as compared with the 18-pulse rectifier of the third prior art.

  The rectifying element that constitutes the three-phase full-wave rectifier circuit and the three-phase bridge rectifier circuit can be composed of only passive elements such as diodes. Since passive elements such as diodes are not easily broken by overcurrent, the reliability of the device is improved and the maintenance and management of the device is facilitated.

  Compared with the 12-pulse rectifier according to the first prior art, the rectifier according to the present invention is a three-phase bridge rectifier circuit in which an interphase transformer is a three-phase transformer having a secondary winding. Since only two current balancers having one winding need be added, the apparatus is not increased in size.

  Further, since the DC reactor and the DC load are connected in series, the inrush current flowing through the DC load can be suppressed, the DC current can be smoothed, and current interruption can be prevented.

  According to the present invention, since the waveform of the three-phase AC input from the three-phase AC power supply can be made closer to a sine wave, the harmonics included in the three-phase AC supplied from the three-phase AC power supply can be reduced. Can do. In addition, 54 pulse rectification can be performed with a simple configuration without increasing the size of the apparatus as compared with the prior art.

The three-phase full-wave rectifier circuit and the three-phase bridge rectifier circuit can be configured with only passive elements. Since passive elements such as diodes are not easily broken by overcurrent, the reliability of the device is improved and the maintenance and management of the device is facilitated. In addition, since it can be configured only with passive elements without using switching elements such as transistors, EMC (Electro Magnetic)
There is no need to add a high frequency noise reduction device such as a compatibility filter. Therefore, it can be suitably used as a power control device. Further, when a filter capacitor is connected in parallel to the load, the capacity of the filter capacitor can be reduced, and the overall configuration of the apparatus is not increased.

  In addition, the inrush current flowing through the DC load can be suppressed, the DC current can be further smoothed, and current interruption can be prevented, so that a stable DC current can be supplied to the DC load.

  FIG. 1 is a circuit diagram showing an electrical configuration of a rectifier 1 according to an embodiment of the present invention. In FIG. 1, in addition to the rectifier 1, a three-phase AC power source 2 and a DC load (RL) 3 are shown together. 2 and 3 are diagrams schematically showing the configuration of the phase shift transformer 4. FIG. 2 also shows a vector diagram of the phase shift transformer 4. 4 is an enlarged circuit diagram showing the phase shift transformer 4 shown in FIG. 1, and FIG. 5 is an enlarged view of the first to third three-phase full-wave rectifier circuits 5A, 5B, 5C shown in FIG. FIG. 6 is an enlarged circuit diagram showing the reactor 6A, 6B between the three-phase positive and negative phases shown in FIG. 1, and FIG. 7 shows the three-phase bridge rectifier circuit 7 shown in FIG. It is a circuit diagram which expands and shows. The rectifier 1 includes a phase shift transformer 4, first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C that are three three-phase full-wave rectifier circuits, a positive-side three-phase reactor 6A, A negative-phase three-phase reactor 6B and a three-phase bridge rectifier circuit 7 are included.

  The rectifier 1 generates a DC voltage by rectifying a symmetrical three-phase AC voltage supplied from a three-phase AC power source 2. The three-phase AC power source 2 is realized by, for example, a Y-type power source having a symmetrical three-phase. The three-phase AC power supply 2 includes a first power supply terminal Da, a second power supply terminal Db, and a third power supply terminal Dc that are output terminals. The three-phase AC power source 2 has a power source neutral point o. The power neutral point o is grounded. The power supply currents flowing from the first power supply terminal Da, the second power supply terminal Db, and the third power supply terminal Dc to the outside of the three-phase AC power supply 2 are represented by Ia, Ib, and Ic, respectively. The predetermined frequency of the three-phase AC voltage output from the three-phase AC power source 2 is, for example, 50 hertz (Hz) and 60 hertz (Hz).

  The phase-shifting transformer 4 is connected to the three-phase AC power source 2 and obtains three sets of three-phase AC voltages having a phase difference of 20 ° based on the three-phase AC voltage supplied from the three-phase AC power source 2. For this purpose, at least two sets of three-phase AC voltages are generated. The phase shift transformer 4 includes first to third phase shift transformer winding portions 11A, 11B, and 11C. The first phase-shifting transformer winding portion 11A includes a first phase-shifting transformer primary winding 12 and first to fourth phase-shifting transformer secondary windings 13 to 16. The first phase-shifting transformer primary winding 12 and the first to fourth phase-shifting transformer secondary windings 13 to 16 of the first phase-shifting transformer winding part 11A are wound around the same iron core. When current flows, they are coupled to each other by a magnetic field. The first phase-shifting transformer winding portion 11A is additive. When the first phase-shifting transformer winding portion 11A is disconnected from the rectifier 1, and when a current is passed with the one end 12a of the first phase-shifting transformer primary winding 12 as the positive electrode and the other end 12b as the negative electrode, In the first to fourth phase shift transformer secondary windings 13 to 16, the winding ends serving as positive electrodes are defined as one ends 13 a to 16 a of the first to fourth phase shift transformer secondary windings 13 to 16.

  The second phase-shifting transformer winding portion 11B includes a second phase-shifting transformer primary winding 17 and fifth to eighth phase-shifting transformer secondary windings 18 to 21. The second phase shift transformer primary winding 17 and the first to fourth phase shift transformer secondary windings 18 to 21 of the second phase shift transformer winding section 11B are wound around the same iron core. When current flows, they are coupled to each other by a magnetic field. The second phase-shifting transformer winding part 11B is additive. When the second phase-shifting transformer winding part 11B is disconnected from the rectifier 1 and the current is passed with the one end 17a of the second phase-shifting transformer primary winding 17 as the positive electrode and the other end 17b as the negative electrode, In the fifth to eighth phase shift transformer secondary windings 18 to 21, the winding end serving as the positive electrode is one end 18 a to 21 a of the fifth to eighth phase shift transformer secondary windings 18 to 21. .

  The second phase shift transformer winding portion 11C includes a third phase shift transformer primary winding 22 and ninth to twelfth phase shift transformer secondary windings 23 to 26. The third phase shift transformer primary winding 22 and the ninth to twelfth phase shift transformer secondary windings 23 to 26 of the second phase shift transformer winding section 11C are wound around the same iron core. When current flows, they are coupled to each other by a magnetic field. The second phase-shifting transformer winding part 11C is additive. When the second phase-shifting transformer winding part 11C is disconnected from the rectifier 1, and when a current is passed with the one end 22a of the third phase-shifting transformer primary winding 22 as the positive electrode and the other end 22b as the negative electrode, The winding ends that are positive in the ninth to twelfth phase shift transformer secondary windings 23 to 26 are defined as one ends 23a to 26a of the ninth to twelfth phase shift transformer secondary windings 23 to 26, respectively.

  One end 12a of the first phase-shifting transformer primary winding 12 and the other end 22b of the third phase-shifting transformer primary winding 22 are connected to each other, and the second phase-shifting transformer primary winding is connected. One end 17a of the first phase shift transformer primary winding 12 and the other end 12b of the first phase shift transformer primary winding 12 are connected to each other, and one end 22a of the third phase shift transformer primary winding 22 and the second phase shift transformer The other ends 17b of the primary winding 17 are connected to each other, and the first to third phase shift transformer primary windings 12, 17, and 22 are connected in a delta (Δ) manner. One end 12a of the first phase shift transformer primary winding 12 and the other end 22b of the third phase shift transformer primary winding 22 are connected to the first power supply terminal Da. The other end 12b of the first phase shift transformer primary winding 12 and one end 17a of the second phase shift transformer primary winding 17 are connected to the second power supply terminal Db. The other end 17b of the second phase shift transformer primary winding 17 and one end 22a of the third phase shift transformer primary winding 22 are connected to the third power supply terminal Dc.

  The other ends 18b, 25b of the fifth and eleventh phase shift transformer secondary windings 18, 25 are connected to each other, and the other ends of the ninth and third phase shift transformer secondary windings 23, 15 are connected. 23b and 15b are mutually connected, and the other ends 13b and 20b of the first and seventh phase shift transformer secondary windings 13 and 20 are mutually connected. Also, one ends 19a and 16a of the sixth and fourth phase-shifting transformer secondary windings 19 and 16 are connected to each other, and one end 24a of the tenth and eighth phase-shifting transformer secondary windings 24 and 21 are connected. , 21a are connected to each other, and one ends 14a, 26a of the second and twelfth phase shift transformer secondary windings 14, 26 are connected to each other. One end 18a of the fifth phase shift transformer secondary winding 18 and the other end 19b of the sixth phase shift transformer secondary winding 19 are connected to the first power supply terminal Da. One end 23a of the ninth phase shift transformer secondary winding 23 and the other end 24b of the tenth phase shift transformer secondary winding 24 are connected to the second power supply terminal Db. One end 13a of the first phase-shifting transformer secondary winding 13 and the other end 14b of the second phase-shifting transformer secondary winding 14 are connected to the third power supply terminal Dc.

The turn ratio of the phase shift transformer 4 is expressed by the following formulas (1) to (4). Here, the number of turns of the first to third phase-shifting transformer primary windings 12, 17, and 22 is Na1, Na2, and Na3, respectively, and the first to twelfth phase-shifting transformer secondary windings 13 to 26 are used. , Nb1 to Nb12, a predetermined first constant Ka, and a predetermined second constant Kb.
Na1: Na2: Na3 = 1: 1: 1 (1)
Na1: Nb1: Nb2: Nb3: Nb4 = 1: Ka: Ka: Kb: Kb (2)
Na2: Nb5: Nb6: Nb7: Nb8 = 1: Ka: Ka: Kb: Kb (3)
Na3: Nb9: Nb10: Nb11: Nb12 = 1: Ka: Ka: Kb: Kb
(4)

  The predetermined first constant Ka is selected as 0.177, for example, and the predetermined second constant Kb is selected as 0.04, for example.

  In the present embodiment, the phase shift transformer 4 includes first to third phase shift transformer primary windings 12, 17, 22 and first to twelfth phase shift transformer secondary windings 13 to 26. For example, it is configured by winding around an inner iron type three-phase iron core.

  One ends 25a, 15a and 20a of the eleventh, third and seventh phase shift transformer secondary windings 25, 15 and 20 of the phase shift transformer 4 are connected to the first three-phase full-wave rectifier circuit 5A. The One end 12a, 17a, 22a and the other end 12b, 17b, 22b of the first to third phase shift transformer primary windings 12, 17, 22 of the phase shift transformer 4 are second three-phase full-wave rectification. Connected to circuit 5B. The other ends 16b, 21b, and 26b of the fourth, eighth, and twelfth phase shift transformers 16, 21, and 26 of the phase shift transformer 4 are connected to the third three-phase full-wave rectifier circuit 5C. Connected.

  The AC voltage generated by the phase shift transformer 4 described above is represented by the vector diagram shown in FIG. For example, the AC voltage at one end 25a of the eleventh phase shift transformer secondary winding 25 is equal to the one end 12a of the first phase shift transformer primary winding 12 and the third phase shift transformer primary winding 22. The AC voltage at the other end 22b has a predetermined phase difference θ1. The AC voltage at one end 25a of the eleventh phase-shifting transformer secondary winding 25 includes the one end 12a of the first phase-shifting transformer primary winding 12 and the third phase-shifting transformer primary winding 22. The phase advances by θ1 with respect to the AC voltage at the end 22b. In addition, for example, the AC voltage at the other end 16b of the fourth phase-shifting transformer secondary winding 16 includes the one end 12a of the first phase-shifting transformer primary winding 12 and the third phase-shifting transformer primary winding. 22 has a predetermined phase difference θ <b> 1 with respect to the AC voltage at the other end 22 b of 22. The AC voltage at the other end 16b of the fourth phase shift transformer secondary winding 16 is equal to the one end 12a of the first phase shift transformer primary winding 12 and the third phase shift transformer primary winding 22. The phase is delayed by θ1 with respect to the AC voltage at the other end 22b. The predetermined phase difference θ1 is 20 °. The AC voltage at one end 25a of the eleventh phase shift transformer secondary winding 25 is a voltage between one end 25a of the eleventh phase shift transformer secondary winding 25 and the power supply neutral point o. . The AC voltage at one end 12a of the first phase-shifting transformer primary winding 12 and the other end 22b of the third phase-shifting transformer primary winding 22 is the first phase-shifting transformer primary winding, respectively. A voltage between one end 12a of the line 12 and the power supply neutral point o, and a voltage between the AC voltage at the other end 22b of the third phase-shifting transformer primary winding 22 and the power supply neutral point o. . The AC voltage at the other end 16b of the fourth phase shift transformer secondary winding 16 is between the AC voltage at the other end 16b of the fourth phase shift transformer secondary winding 16 and the power supply neutral point o. Is the voltage.

  Thus, the three-phase AC voltage at the one ends 25a, 15a and 20a of the eleventh, third and seventh phase-shifting transformer secondary windings 25, 15 and 20 of the phase-shifting transformer 4, and the phase-shifting transformer 4 The three-phase AC voltages at the other ends 16b, 21b, and 26b of the fourth, eighth, and twelfth phase-shifting transformer secondary windings 16, 21, and 26 are the three-phase AC power supplied from the three-phase AC power source 2, respectively. It has a phase difference of 20 ° with respect to the voltage. In the present embodiment, the phase shift transformer 4 generates two sets of three-phase AC voltages of ± 20 ° with respect to the three-phase AC voltage supplied from the three-phase AC power source 2. As a result, three sets of three-phase AC voltages having a phase difference of 20 ° are obtained.

  The first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C, which are three-phase full-wave rectifiers, respectively perform full-wave rectification on the three sets of three-phase AC voltages generated by the phase shift transformer 4. The first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C are realized by a three-phase diode bridge rectifier circuit. The first three-phase full-wave rectifier circuit 5A includes six diodes of first to sixth diodes 31 to 36. The second three-phase full-wave rectifier circuit 5B includes six diodes of 11th to 16th diodes 37 to 42. The third three-phase full-wave rectifier circuit 5C is configured to include six diodes of 21st to 26th diodes 43 to 48.

  The first three-phase full-wave rectifier circuit 5A includes first to sixth diodes 31 to 36 that are rectifier elements. The anode 31a of the first diode 31 and the cathode 32b of the second diode 32 are connected to each other. The anode 33a of the third diode 33 and the cathode 34b of the fourth diode 34 are connected to each other. The anode 35a of the fifth diode 35 and the cathode 35b of the sixth diode 36 are connected to each other. The cathodes 31b, 33b and 35b of the first, third and fifth diodes 31, 33 and 35 are connected to each other, and the anodes 32a, 34a and 36a of the second, fourth and sixth diodes 32, 34 and 36 are Connected to each other. The cathodes 31b, 33b, and 35b of the first, third, and fifth diodes 31, 33, and 35 serve as positive electrodes for the direct current output of the first three-phase full-wave rectifier circuit 5A. First positive terminal 51A is formed on the positive electrode of the direct current output of first three-phase full-wave rectifier circuit 5A. The anodes 32a, 34a, and 36a of the second, fourth, and sixth diodes 32, 34, and 36 serve as negative electrodes for the DC output of the first three-phase full-wave rectifier circuit 5A. A first negative electrode terminal 52A is formed on the negative electrode of the DC output of first three-phase full-wave rectifier circuit 5A.

  The second three-phase full-wave rectifier circuit 5B includes 11th to 15th diodes 37 to 42 that are rectifier elements. The anode 37a of the eleventh diode 37 and the cathode 38b of the twelfth diode 38 are connected to each other. The anode 39a of the thirteenth diode 39 and the cathode 40b of the fourteenth diode 40 are connected to each other. The anode 41a of the fifteenth diode 41 and the cathode 42b of the sixteenth diode 42 are connected to each other. The cathodes 37b, 39b, 41b of the eleventh, thirteenth and fifteenth diodes 37, 39, 41 are connected to each other, and the anodes 38a, 40a, 42a of the twelfth, fourteenth and sixteenth diodes 38, 40, 42 are Connected to each other. The cathodes 37b, 39b, and 41b of the eleventh, thirteenth, and fifteenth diodes 37, 39, and 41 serve as positive electrodes of the DC output of the second three-phase full-wave rectifier circuit 5B. A second positive electrode terminal 51B is formed on the positive electrode of the DC output of the second three-phase full-wave rectifier circuit 5B. The anodes 38a, 40a, and 42a of the twelfth, fourteenth, and sixteenth diodes 38, 40, and 42 serve as negative electrodes for the DC output of the second three-phase full-wave rectifier circuit 5B. A second negative electrode terminal 52B is formed on the negative electrode of the DC output of the second three-phase full-wave rectifier circuit 5B.

  The third three-phase full-wave rectifier circuit 5C includes 21st to 26th diodes 43 to 48 that are rectifier elements. The anode 43a of the 21st diode 43 and the cathode 44b of the 22nd diode 44 are connected to each other. The anode 45a of the 23rd diode 45 and the cathode 46b of the 24th diode 46 are connected to each other. The anode 47a of the 25th diode 47 and the cathode 48b of the 26th diode 48 are connected to each other. The cathodes 43b, 45b, 47b of the 21st, 23rd, and 25th diodes 43, 45, 47 are connected to each other, and the anodes 44a, 46a, 48a of the 22nd, 24th, and 26th diodes 44, 46, 48 are Connected to each other. The cathodes 43b, 45b, 47b of the twenty-first, twenty-third, and twenty-fifth diodes 43, 45, 47 are the positive electrodes of the DC output of the third three-phase full-wave rectifier circuit 5C. A third positive electrode terminal 51C is formed on the positive electrode of the DC output of the third three-phase full-wave rectifier circuit 5C. The anodes 44a, 46a, 48a of the twenty-second, twenty-fourth and twenty-sixth diodes 44, 46, 48 serve as negative electrodes for the DC output of the third three-phase full-wave rectifier circuit 5C. A third negative electrode terminal 52C is formed on the negative electrode of the DC output of the third three-phase full-wave rectifier circuit 5C.

  The first three-phase full-wave rectifier circuit 5A includes first to third AC connection terminals 53a to 53c. A first AC connection terminal 53a is formed between the anode 31a of the first diode 31 and the cathode 32a of the second diode 32, and the second is connected between the anode 33a of the third diode 33 and the cathode 34B of the fourth diode 34. An AC connection terminal 53 b is formed, and a third AC connection terminal 53 c is formed between the anode 35 a of the fifth diode 35 and the cathode 36 b of the sixth diode 36. One end 25a of the eleventh secondary winding 25 of the phase shift transformer 4 is connected to the first AC connection terminal 53a. One end 15a of the third secondary winding 15 of the phase shift transformer 4 is connected to the second AC connection terminal 53b. One end 20a of the seventh secondary winding 20 of the phase shift transformer 4 is connected to the third AC connection terminal 53c.

  The second three-phase full-wave rectifier circuit 5B has first to thirteenth AC connection terminals 54a to 54c, respectively. The eleventh AC connection terminal 54a is formed between the anode 37a of the eleventh diode 37 and the cathode 38b of the twelfth diode 38, and the twelfth between the anode 39a of the thirteenth diode 39 and the cathode 40b of the fourteenth diode 40. An AC connection terminal 54b is formed, and a 13th AC connection terminal 54c is formed between the anode 41a of the fifteenth diode 41 and the cathode 42b of the sixteenth diode 42. The eleventh AC connection terminal 54a is connected to one end 12a of the first primary winding 12 and the other end 22b of the third primary winding 22 of the phase shift transformer 4 and the first power supply terminal Da. . The 12th AC connection terminal 54b is connected to one end 17a of the second primary winding 17 of the phase shift transformer 4, the other end 12b of the first primary winding 12, and the second power supply terminal Db. . The 13th AC connection terminal 54c is connected to one end 12a of the third primary winding 12 of the phase shift transformer 4, the other end 17b of the second primary winding 17, and the third power supply terminal Dc. .

  The third three-phase full-wave rectifier circuit 5C includes 21st to 23rd AC connection terminals 55a to 55c, respectively. A twenty-first AC connection terminal 55 a is formed between the anode 43 a of the twenty-first diode 43 and the canode 44 b of the twenty-second diode 44, and the twenty-second diode is connected between the asode 45 a of the twenty-third diode 45 and the canode 46 b of the twenty-fourth diode 46. An AC connection terminal 55 c is formed, and a 23rd AC connection terminal 55 c is formed between the anode 47 a of the 25th diode 47 and the canode 48 b of the 26th diode 48. The other end 16b of the fourth secondary winding 16 of the phase shift transformer 4 is connected to the 21st AC connection terminal 55a. The other end 21b of the eighth secondary winding 21 of the phase shift transformer 4 is connected to the 22nd AC connection terminal 55b. The other end 26b of the twelfth secondary winding 26 of the phase shift transformer 4 is connected to the 23rd AC connection terminal 55c.

  The positive-phase and negative-phase three-phase reactors 6A and 6B have the first to third three-phase full waves because the DC output voltages of the first to third three-phase full-wave rectifier circuits 5A to 5C interfere with each other. The output current of the rectifier circuits 5A to 5C has a function of preventing the output current from fluctuating greatly with the passage of time. The positive-phase and negative-phase three-phase reactors 6A and 6B adjust the DC output currents of the first to third three-phase full-wave rectifier circuits 5A to 5C, and a three-phase bridge rectifier circuit to be described later with a secondary winding. 7 adjusts the commutation timing.

  The positive electrode side three-phase interphase reactor 6A is an interphase transformer and includes first to third winding portions 60A to 60C. Two primary windings and secondary windings are wound around the first to third winding portions 60A to 60C, respectively. The first winding portion 60A is formed by winding a first primary winding 61, a second primary winding 62, and a first secondary winding 63 around the same iron core. The first primary winding 61, the second primary winding 62, and the first secondary winding 63 are coupled to each other by a magnetic field when a current flows. The first primary winding 61 and the first secondary winding 63 are depolarized, and the second primary winding 62 and the first secondary winding 63 are additive. When the first winding portion 60A is disconnected from the rectifying device 1 and a current is passed with one end 61a of the first primary winding 61 as a positive electrode and the other end 61b as a negative electrode, The winding end serving as the positive electrode is defined as one end 63 a of the first secondary winding 63. Further, when the first winding portion 60A is disconnected from the rectifier 1 and a current is passed with one end 61a of the first primary winding 61 as a positive electrode and the other end 61b as a negative electrode, the second primary winding 62 is provided. The winding end serving as the positive electrode in FIG. 1 is defined as one end 62 a of the second primary winding 62.

  The second winding portion 60B is formed by winding a third primary winding 64, a fourth primary winding 65, and a second secondary winding 66 around the same iron core. The third primary winding 64, the fourth primary winding 65, and the second secondary winding 66 are coupled to each other by a magnetic field when a current flows. The third primary winding 64 and the second secondary winding 66 are depolarized, and the fourth primary winding 65 and the second secondary winding 66 are additive. When the second winding portion 60B is disconnected from the rectifying device 1 and a current is passed with the one end 64a of the third primary winding 64 as a positive electrode and the other end 64b as a negative electrode, The winding end serving as the positive electrode is defined as one end 66 a of the second secondary winding 66. In addition, when the first winding portion 60A is disconnected from the rectifying device 1 and a current is passed with one end 64a of the third primary winding 64 as a positive electrode and the other end 64b as a negative electrode, a fourth primary winding 65 is obtained. The winding end serving as the positive electrode in FIG. 5 is defined as one end 65 a of the fourth primary winding 65.

  The third winding portion 60C is formed by winding a fifth primary winding 67, a sixth primary winding 68, and a third secondary winding 69 around the same iron core. The fifth primary winding 67, the sixth primary winding 68, and the third secondary winding 69 are coupled to each other by a magnetic field when a current flows. The fifth primary winding 67 and the third secondary winding 69 are depolarized, and the sixth primary winding 68 and the third secondary winding 69 are additive. When the third winding portion 60C is disconnected from the rectifying device 1 and a current is passed with one end 67a of the fifth primary winding 67 as a positive electrode and the other end as a negative electrode, a positive electrode is applied to the third secondary winding 69. The end of the winding becomes the one end 69a of the third secondary winding 69. Further, when the third winding portion 60C is disconnected from the rectifier 1 and a current is passed with one end 67a of the fifth primary winding 67 as a positive electrode and the other end as a negative electrode, The winding end serving as the positive electrode is defined as one end 68 a of the sixth primary winding 68.

  The first positive terminal 51A of the first full-wave rectifier circuit 5A described above is connected to one end 61a of the first primary winding 61 wound around the first winding section 60A. The second positive terminal 51B of the second full-wave rectifier circuit 5B is connected to one end 64a of the third primary winding 64 wound around the second winding part 60B. The third positive terminal 51C of the third full-wave rectifier circuit 5C is connected to one end 67a of the fifth primary winding 67 wound around the third winding portion 60C.

  The other end 61b of the first primary winding 61 wound around the first winding portion 60A, and the other end 68b of the sixth primary winding 68 wound around the third winding portion 60C Are connected to each other, and the first primary winding 61 and the sixth primary winding 68 are connected in series. The other end 64b of the third primary winding 64 wound around the second winding portion 60B and the other end 62b of the second primary winding 62 wound around the first winding portion 60A Are connected to each other, and the third primary winding 64 and the second primary winding 62 are connected in series. The other end 67b of the fifth primary winding 67 wound around the third winding portion 60C, and the other end 65b of the fourth primary winding 65 wound around the second winding portion 60B, Are connected to each other, and the fifth primary winding 67 and the fourth primary winding 65 are connected in series.

  One ends 62a, 65a, 68a of the second, fourth, and sixth primary windings 62, 65, 68 are connected to each other so that the first to sixth primary windings 61, 62, 64, 65 are connected. , 67, 68 are formed. The portions where the ends 62a, 65a, 68a of the second, fourth and sixth primary windings 62, 65, 68 are connected to each other are staggered by the first to sixth primary windings 68. Neutral point Po. The first to third positive terminals 51A to 51C of the first to third full-wave rectifier circuits 5A to 5B described above are respectively connected to one end of the primary winding that is farthest from the neutral point Po of the staggered connection. Electrical connection is made at the neutral point Po of the staggered connection of the first to sixth primary windings 61, 62, 64, 65, 67, 68. The first to sixth primary windings 61, 62, 64, 65, 67, 68 synthesize the DC outputs of the first to third three-phase full-wave rectifier circuits 5A, 5B, 5C.

The turn ratio of each winding in the first to third winding portions 60A to 60C is expressed by the following formulas (5) to (8). Here, the number of turns of the first to sixth primary windings 61, 62, 64, 65, 67, and 68 is Nc1 to Nc6, respectively, and the number of turns of the first to third secondary windings 63, 66, and 69 is set. Is Nd1 to Nd3, and a predetermined third constant is Kc.
Nc1: Nc6 = Nc3: Nc2 = Nc5: Nc4 = 1: 1 (5)
Nc1: Nc2: Nd1 = 1: 1: Kc (6)
Nc3: Nc4: Nd2 = 1: 1: Kc (7)
Nc5: Nc6: Nd3 = 1: 1: Kc (8)

  The predetermined third constant Kc is selected to be about 0.33, more preferably 1/3. In the present embodiment, the positive-phase three-phase interphase reactor 6A includes first to sixth primary windings 61, 62, 64, 65, 67, 68 and first to third secondary windings 63, 66, 69 is wound around, for example, an inner iron type three-phase iron core.

  The negative electrode side three-phase interphase reactor 6B is an interphase transformer and includes fourth to sixth winding portions 70A to 70C. Two primary windings and secondary windings are wound around the fourth to sixth winding portions 70A to 70C, respectively. The fourth winding portion 70A is formed by winding a seventh primary winding 71, an eighth primary winding 72, and a fourth secondary winding 73 around the same iron core. The seventh winding portion 71, the eighth winding portion 72, and the fourth secondary winding 73 are coupled to each other by a magnetic field when a current flows. The seventh winding portion 71 and the fourth secondary winding 73 are additive, and the eighth primary winding 72 and the fourth secondary winding 73 are depolarized. When the fourth winding portion 70A is disconnected from the rectifier 1, and a current is passed with the one end 71a of the seventh primary winding 71 as a positive electrode and the other end 71b as a negative electrode, the fourth secondary winding 73 is provided. The winding end serving as the positive electrode in FIG. In addition, when the fourth winding portion 70A is disconnected from the rectifier 1, and the current flows with the one end 71a of the seventh primary winding 71 as the positive electrode and the other end 71b as the negative electrode, the eighth primary winding A winding end serving as a positive electrode in 72 is defined as one end 72 a of the eighth primary winding 72.

  The fifth winding portion 70B is formed by winding a ninth primary winding 74, a tenth primary winding 75, and a fifth secondary winding 76 around the same iron core. The ninth primary winding 74, the tenth primary winding 75, and the fifth secondary winding 76 are coupled to each other by a magnetic field when a current flows. The ninth primary winding 74 and the fifth secondary winding 76 are additive, and the tenth primary winding 75 and the fifth secondary winding 76 are depolarized. When the fifth winding portion 70B is disconnected from the rectifier 1, and a current is passed with one end 74a of the ninth primary winding 74 as a positive electrode and the other end 74b as a negative electrode, the fifth secondary winding 76 is provided. The winding end serving as the positive electrode in FIG. 5 is defined as one end 76 a of the fifth secondary winding 76. Further, when the fourth winding portion 70B is disconnected from the rectifying device 1, and the current is passed with the one end 74a of the ninth primary winding 74 as the positive electrode and the other end 74b as the negative electrode, the tenth primary winding A winding end that is a positive electrode in 75 is one end 75 a of the tenth primary winding 75.

  The sixth winding portion 70C is formed by winding an eleventh primary winding 77, a twelfth primary winding 78, and a sixth secondary winding 79 around the same iron core. The eleventh primary winding 77, the twelfth primary winding 78, and the sixth secondary winding 79 are coupled to each other by a magnetic field when a current flows. The eleventh primary winding 77 and the sixth secondary winding 79 are depolarized, and the twelfth primary winding 78 and the sixth secondary winding 79 are depolarized. When the sixth winding portion 70C is disconnected from the rectifier 1, and a current is passed with one end of the eleventh primary winding 77 as the positive electrode 77a and the other end 77b as the negative electrode, the sixth secondary winding 79 The winding end serving as the positive electrode in FIG. 6 is defined as one end 79 a of the sixth secondary winding 79. In addition, when the sixth winding portion 70C is disconnected from the rectifier 1, and a current is passed with one end 77a of the eleventh primary winding 77 as the positive electrode and the other end 77b as the negative electrode, the twelfth primary winding A winding end serving as a positive electrode in 78 is defined as one end 78 a of the twelfth primary winding 78.

  The first negative terminal 52A of the first full-wave rectifier circuit 5A described above is connected to one end 71a of the seventh primary winding 71 wound around the fourth winding portion 70A. The second negative terminal 52B of the second full-wave rectifier circuit 5B is connected to one end 74a of the ninth primary winding 74 wound around the fifth winding portion 70B. The third negative terminal 52C of the third full-wave rectifier circuit 5C is connected to one end 77a of the eleventh primary winding 77 wound around the sixth winding portion 70C.

  The other end 71B of the seventh primary winding 71 wound around the fourth winding portion 70A and the other end of the twelfth primary winding 78 wound around the sixth winding portion 70C. 78b are connected to each other, and the seventh winding portion 71 and the twelfth primary winding 78 are connected in series. The other end 74b of the ninth primary winding 74 wound around the fifth winding portion 70B and the other end of the eighth primary winding 72 wound around the fourth winding portion 70A. 72b are connected to each other, and the ninth primary winding 74 and the eighth primary winding 72 are connected in series. The other end 77b of the eleventh primary winding 77 wound around the sixth winding portion 70C and the one end 75a of the tenth primary winding 75 wound around the fifth winding portion 70b. Are connected to each other, and the eleventh primary winding 77 and the tenth winding portion 75 are connected in series.

  One ends 72a, 75a, 78a of the eighth, tenth and twelfth primary windings 72, 75, 78 are connected to each other to form seventh to twelfth primary windings 71, 72, 74, 75. , 77, 78 are formed. The parts where the other ends 72a, 75a, 78a of the eighth, tenth and twelfth primary windings 72, 75, 78 are connected to each other are the seventh to twelfth primary windings 71, 72, The neutral point No. of the staggered connection according to 74, 75, 77, 78. The first to third negative terminals 52A to 52C of the first to third full-wave rectifier circuits 5A to 5C described above are respectively connected to one end of the primary winding that is farthest from the neutral point No of the staggered connection. Electrical connection is made at the neutral point of the staggered connection by the seventh to twelfth first windings 71, 72, 74, 75, 77, 78. The seventh to twelfth primary windings 71, 72, 74, 75, 77, 78 synthesize the DC outputs of the first to third three-phase full-wave rectifier circuits 5A, 5B, 5C.

The turn ratio of each winding in the fourth to sixth winding portions 70A to 70C is expressed by the following equations (9) to (12). Here, the number of turns of the seventh to twelfth primary windings 71, 72, 74, 75, 77, 78 is Ne1 to Ne6, respectively, and the number of turns of the third to sixth secondary windings 73, 76, 79 is as follows. Is Nf1 to fd3, and a predetermined fourth constant is Kd.
Ne1: Ne6 = Ne3: Ne2 = Ne5: Ne4 = 1: 1 (9)
Ne1: Ne2: Nf1 = 1: 1: Kd (10)
Ne3: Ne4: Nf2 = 1: 1: Kd (11)
Ne5: Ne6: Nf3 = 1: 1: Kd (12)

  The predetermined fourth constant Kd is equal to the above-described predetermined third constant Kc, and is selected to be about 0.33, more preferably 1/3. The number of turns of the seventh to twelfth primary windings 71, 72, 74, 75, 77, 78 is the number of turns of the first to sixth primary windings 61, 62, 64, 65, 67, 68. Equally chosen. In the present embodiment, the negative-side three-phase interphase reactor 6B includes the seventh to twelfth primary windings 71, 72, 74, 75, 77, 78 and the fourth to sixth secondary windings 73, 76, 79 is wound around, for example, an inner iron type three-phase iron core.

  The other end 63b of the first secondary winding 63 of the positive side three-phase reactor 6A and the other end 73b of the fourth secondary winding 73 of the negative side three-phase reactor 6B are connected to each other. Is done. The other end 66b of the second secondary winding 66 of the positive side three-phase reactor 6A and the other end 76b of the fifth secondary winding 76 of the negative side three-phase reactor 6B are connected to each other. . The other end 69b of the third secondary winding 69 of the positive side three-phase reactor 6A and the other end 79b of the sixth secondary winding 79 of the negative side three-phase reactor 6B are connected to each other. . Also, the one ends 73a, 76a, 79a of the fourth to sixth secondary windings 73, 76, 79 of the negative-phase side three-phase reactor 6B are connected to each other.

  Hereinafter, the three-phase reactors 6A and 6B between the positive electrode side and the negative electrode side may be collectively referred to as a three-phase reactor. Further, the first to sixth primary windings 61, 62, 64, 65, 67, and 68 may be collectively referred to simply as a primary winding. Further, the seventh to twelfth winding portions 71, 72, 74, 75, 77, and 78 may be collectively referred to as primary windings in some cases. In some cases, the first to third secondary windings 63, 66, and 69 are simply referred to as secondary windings. Further, the fourth to sixth secondary windings 73, 76, and 79 may be collectively referred to simply as secondary windings.

The three-phase bridge rectifier circuit 7 that is a three-phase bridge rectifier superimposes the secondary outputs of the positive-phase and negative-phase three-phase reactors 6A and 6B, that is, the output of the secondary winding, on the DC voltage. Reduce the ripple.
The three-phase bridge rectifier circuit 7 includes six diodes of 31st to 36th diodes 81 to 86 that are rectifier elements. The three-phase bridge rectifier circuit 7 is constituted by a three-phase diode bridge rectifier circuit, similarly to the first to third three-phase full-wave rectifier circuits described above. The anode 81a of the 31st diode 81 and the cathode 82b of the 32nd diode 82 are connected to each other. The anode 83a of the 33rd diode 83 and the cathode 84b of the 34th diode 84 are connected to each other. The anode 85a of the 35th diode 85 and the cathode 86b of the 36th diode 86 are connected to each other. The cathodes 81b, 83b and 85b of the 31st, 33rd and 35th diodes 81, 83 and 85 are connected to each other, and the anodes 82a, 84a and 86a of the 32nd, 34th and 36th diodes 82, 84 and 86 are connected to each other. Connected to each other. The cathodes 81 b, 83 b, 85 b of the 31st, 33rd and 35th diodes 81, 83, 85 become the positive electrode of the DC output of the three-phase bridge rectifier circuit 7. A three-phase bridge positive terminal 87 is formed on the positive electrode of the DC output of the three-phase bridge rectifier circuit 7. Further, the anodes 82a, 84a, 86a of the 32nd, 34th, and 36th diodes 82, 84, 86 are the negative electrodes of the DC output of the three-phase bridge rectifier circuit 7. A three-phase bridge negative electrode terminal 88 is formed on the negative electrode of the DC output of the three-phase bridge rectifier circuit 7.

  The three-phase bridge rectifier circuit 7 includes first to third bridge AC connection terminals a to 89c. A first bridge AC connection terminal a is formed between the anode 81a of the 31st diode 81 and the cathode 82b of the 32nd diode 82, and the first bridge AC connection terminal a is formed between the anode 83a of the 33rd diode 83 and the cathode 84a of the 34th diode 84. A two-bridge AC connection terminal b is formed, and a third bridge AC connection terminal c is formed between the anode 85a of the 35th diode 85 and the cathode 86b of the 36th diode 86.

  The first to third bridge AC connection terminals a, 89b, 89c of the three-phase bridge rectifier circuit 7 are the secondary windings 63, 66, 69 and the negative electrode of the three positive-phase three-phase reactors 6A connected in series. The side three-phase interphase reactor 6B is connected to a different end of each set of secondary windings 73, 76, 79 of the reactor. Specifically, one end 63a of the first secondary winding 63 of the positive side three-phase reactor 6A is connected to the first bridge AC connection terminal a. One end 66a of the second secondary winding 66 of the positive side three-phase reactor 6A is connected to the second bridge AC connection terminal b. The third bridge AC connection terminal c is connected to one end 69a of the third secondary winding 69 of the positive side three-phase reactor 6A.

  The three-phase bridge rectifier circuit 7 is connected to the DC load 3 in series. The neutral phase Po of the staggered connection by the first to sixth primary windings 61, 62, 64, 65, 67, 68 of the positive-phase side three-phase reactor 6A is mutually connected Connected to. The three-phase bridge positive terminal 87 is connected to one end 3a of a DC load 3 to which a DC reactor 8 (Direct Current Reactl: abbreviated as DCL) 8 is connected in series. Also, the neutral point No. of the staggered connection by the seventh to twelfth primary windings 71, 72, 74, 75, 77, 78 of the negative-phase side three-phase reactor 6B and the other end 3b of the DC load 3 are mutually connected. Connected to.

  The direct current reactor 8 is connected in series to the three-phase bridge rectifier circuit 7 to convert the secondary current into a direct current source. The DC reactor 8 includes a three-phase bridge positive terminal 87 of the three-phase bridge rectifier circuit 7 and seventh to twelfth primary windings 71, 72, 74, 75, 77, 78 of the negative-phase three-phase reactor 6B. A DC load 3 is connected in series with the neutral point No. of the staggered connection. One end 8 a of the DC reactor 8 is connected to the three-phase bridge positive terminal 87 of the three-phase bridge rectifier circuit 7. The other end 8 b of the DC reactor 8 is connected to one end 3 a of the DC load 3, in other words, the positive end of the DC load. By connecting the DC reactor 8 in series with the DC load 3, the inrush current flowing through the DC load 3 can be suppressed, the DC current id flowing through the DC load 3 can be smoothed, and current interruption can be prevented. Can do. Hereinafter, the direct current id flowing through the load is referred to as a load current id.

  Below, operation | movement of the rectifier 1 is demonstrated. When three-phase alternating current is supplied to the rectifier 1 by the three-phase alternating current power supply 2, three sets of three-phase alternating voltages having a phase difference of 20 ° are generated by the phase shift transformer. The three-phase voltages applied to the first to third AC connection terminals 53a, 53b, and 53c of the first three-phase full-wave rectifier circuit 5A are Vax, Vbx, and Vcx, respectively, and the second three-phase full-wave rectifier circuit 5B The three-phase voltages applied to the fourth to sixth AC connection terminals 54a, 54b and 54c are Vay, Vby and Vcy, respectively, and the seventh to ninth AC connection terminals 55a and 55b of the second three-phase full-wave rectifier circuit 5B. , 55c are Vaz, Vbz, and Vcz, respectively.

  The three-phase voltages Vax, Vbx, Vcx, Vay, Vby, Vcy, Vaz, Vbz, and Vcz generated by the phase shift transformer 4 are E, the effective value of the line voltage, the angular frequency ω, and the time If t, then it is represented by the following formula (13). p = π.

A relational expression related to the voltage of the primary winding in the positive-phase side three-phase reactor 6A is obtained. From the turns ratio of the primary winding, the following formulas (14) to (16) are established. Here, the potential of the first positive terminal 51A of the first three-phase full-wave rectifier circuit 5A is Vpx, the potential of the second positive terminal 51B of the second three-phase full-wave rectifier circuit 5B is Vpy, and the third 3 The potential of the third positive terminal 51C of the phase full-wave rectifier circuit 5C is set to Vpz. In addition, the potential of the connection portion between the first primary winding 61 and the sixth primary winding 68 of the first three-phase full-wave rectifier circuit 5A is Vpf, and the second primary winding 62 and the first Let Vpg be the potential at the connection with the primary winding 61, and Vph be the potential at the connection between the third primary winding 64 and the second primary winding 62. Further, the potential at the neutral point Po of the staggered connection by the first to sixth primary windings 61, 62, 64, 65, 67, 68 of the first three-phase full-wave rectifier circuit 5A is set to Vp.
Vpx−Vpf = − (Vpg−Vp) (14)
Vpy−Vpg = − (Vph−Vp) (15)
Vpz−Vph = − (Vpf−Vp) (16)

The three-phase reactor is a three-phase transformer, and the sum of the three leg magnetic fluxes is zero (0). Therefore, the following formula (17) is established for the winding voltage.
(Vpx−Vpf) + (Vpy−Vpg) + (Vpz−Vph) = 0 (17)
From the equations (14) to (16) described above, the following equations (18) to (21) are obtained.

Ｖpx−Ｖpf＝（Ｖpx−Ｖpy）／３ …（19）
Ｖpy−Ｖpx＝（Ｖpy−Ｖpz）／３ …（20）
Ｖpz−Ｖpz＝（Ｖpz−Ｖpx）／３ …（21）

Vpx−Vpf = (Vpx−Vpy) / 3 (19)
Vpy−Vpx = (Vpy−Vpz) / 3 (20)
Vpz−Vpz = (Vpz−Vpx) / 3 (21)

  Equation (18) represents the primary side output potential of the positive-phase three-phase interphase reactor 6A. Expressions (19) to (21) represent the primary side phase voltage of the positive-side three-phase reactor 6A, that is, the differential value of the leg magnetic flux.

Ｖnx−Ｖnf＝（Ｖnx−Ｖny）／３ …（27）
Ｖny−Ｖnx＝（Ｖny−Ｖnz）／３ …（28）
Ｖnz−Ｖnz＝（Ｖnz−Ｖnx）／３ …（29） The following formulas (22) to (29) similar to the formulas (14) to (21) are also established for the negative electrode side three-phase interphase reactor 6B. Here, the potential of the first negative terminal 52A of the first three-phase full-wave rectifier circuit 5A is Vnx, the potential of the second negative terminal 52B of the second three-phase full-wave rectifier circuit 5B is Vny, and the third 3 The potential of the third negative terminal 52C of the phase full-wave rectifier circuit 5C is set to Vnz. Further, the potential of the connection portion between the seventh primary winding 71 and the twelfth primary winding 78 is Vnf, and the potential of the connection portion between the eighth primary winding 72 and the seventh primary winding 71 is The potential is Vng, and the potential of the connection portion between the ninth primary winding 74 and the eighth primary winding 72 is Vng. Further, a formula (22) in which the potential at the neutral point No. of the staggered connection by the seventh to twelfth primary windings 71, 72, 74, 75, 77, 78 of the first three-phase full-wave rectifier circuit 5A is Vn. ) To Expression (29) are obtained by replacing the subscript p with n in Expressions (19) to (21).
Vnx−Vnf = − (Vng−Vn) (22)
Vny−Vng = − (Vnh−Vn) (23)
Vnz−Vnh = − (Vnf−Vn) (24)
(Vnx−Vnf) + (Vny−Vng) + (Vnz−Vnh) = 0 (25)

Vnx−Vnf = (Vnx−Vny) / 3 (27)
Vny−Vnx = (Vny−Vnz) / 3 (28)
Vnz−Vnz = (Vnz−Vnx) / 3 (29)

Next, the voltage applied to the three-phase bridge rectifier circuit 7 is obtained. Here, the potential of the first bridge AC connection terminal 89a is Vf, the potential of the second bridge AC connection terminal 89b is Vg, and the potential of the third bridge AC connection terminal 89c is Vh. Further, the potential of the connection portion where the one ends 73a, 76a, 79a of the fourth to sixth secondary windings 73, 76, 79 are connected to each other is defined as Vm. Note that Equation (17) is the primary winding voltage of the positive-phase three-phase reactor 6A, and Equation (26) is the primary winding voltage of the negative-phase three-phase reactor 6B. Equations (30) to (32) are obtained. Here, the predetermined second and third constants Kb and Kc representing the aforementioned winding ratios of the positive-phase and negative-phase three-phase reactors 6A and 6B are N.
Vf−Vm = N {(Vpx−Vnx) − (Vpy−Vny)} / 3 (30)
Vx−Vm = N {(Vpy−Vny) − (Vpz−Vnz)} / 3 (31)
Vh−Vm = N {(Vpz−Vnz) − (Vpx−Vnx)} / 3 (32)

  In addition, when the positive and negative secondary windings are not wound around the positive and negative three-phase reactors 6A and 6B, respectively, the currents that obviously flow through the first to third full-wave rectifier circuits 5A, 5B, and 5C Are balanced, that is, the currents flowing through the first to third full-wave rectifier circuits 5A, 5B, and 5C are always constant. That is, if the secondary winding is not wound around each of the positive-phase and negative-phase three-phase reactors 6A and 6B, the rectifier 1 simply operates as an 18-pulse rectifier circuit.

When current flows through the first to sixth secondary windings 63, 66, 69, 73, 76, 79, the following relational expressions (33) to (35) are established. Here, the current output from the first positive terminal 51A of the first three-phase full-wave rectifier circuit 5A is ipx, and the current input to the first negative terminal 52A is ipn. The current output from the second positive terminal 51B of the second three-phase full-wave rectifier circuit 5B is ipy, and the current input to the second negative terminal 52B is iny. The current output from the third positive terminal 51C of the third three-phase full-wave rectifier circuit 5C is defined as ipz, and the current input to the third negative terminal 52C is defined as ipz. The load current flowing through the DC load 3 is assumed to be id. The current output from the first secondary winding 63 to the three-phase bridge rectifier circuit 7 is set as if, the current output from the second secondary winding 66 to the three-phase bridge rectifier circuit 7 is set as ig, The current output from the 3 secondary winding 69 to the three-phase bridge rectifier circuit 7 is ih. The predetermined second and third constants Kb and Kc representing the winding ratios of the positive-side and negative-side three-phase reactors 6A and 6B described above are N.
ipx = inx = id / 3 + N (if−ih) / 3 (33)
ipy = iny = id / 3 + N (ig-if) / 3 (34)
ipz = inz = id / 3 + N (ih-ig) / 3 (35)

  In Expressions (33) to (35), the first term on the right side represents a steady current determined by the DC load 3. In the equations (33) to (35), the second term on the right side is the current flowing in the secondary windings of the reactors 6A and 6B between the three-phase phases, in other words, the secondary current. Expressions (33) to (35) mean that the current in the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C can be increased or decreased by appropriately flowing a secondary current. . Further, in the formulas (33) to (35), the positive and negative DC currents are equal, that is, ipx = inx, ipy = iny, and ipz = inz. This indicates that there is no current flowing across the rectifier circuits 5A, 5B, and 5C. From Expression (33) to Expression (35), the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C have a constant current of one third of the load current id, that is, id / 3. It can be seen that it can be increased or decreased by if, ig and ih.

  In the rectifier 1 including the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C constituted by the diodes described above, the first to third three-phase full-wave rectifier circuits 5A, The diodes constituting the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C change from the conductive state to the non-conductive state, or the non-conductive state due to the commutation of the current flowing through 5B and 5C. The current discontinuity caused by the change from the current state to the conductive state causes the generation of harmonics. Accordingly, when commutation occurs in the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C, the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C that generate the commutation occur. If the amount of current can be reduced, current discontinuity due to commutation can be reduced.

From expression (13), expression (19) to expression (21), expression (27) to expression (29), and expression (30) to expression (32), Vf− representing the secondary winding voltage of the reactor between the three-phase phases Vm, Vg-Vm, and Vh-Vm are represented by the following formulas (36) to (38).
Vf−Vm = f (ωt−π / 18) (36)
Vg−Vm = f (ωt−3π / 18) (37)
Vh−Vm = f (ωt−5π / 18) (38)

  In the expressions (36) to (38), the function f (θ) is a periodic function having a period of “π / 3” and is represented by the following expression (39).

  FIG. 8 is a chart showing the waveforms of the secondary winding voltages of the reactors 6A and 6B between the positive-phase and negative-phase three-phase phases. In the chart of FIG. 8, the vertical axis represents voltage, and the horizontal axis represents the electrical angle ωt. Here, the unit of voltage is volts (V), and the unit of electrical angle is degrees (°). In the chart of FIG. 8, the waveform of Vf-Vm is indicated by a solid line, the waveform of Vg-Vm is indicated by a dotted line, and the waveform of Vh-Vm is indicated by a one-dot chain line. The rated voltage of the alternating voltage is 1 volt (V), the load direct current is 1 ampere (A), and the load resistance is approximately 1 / 1.35 ohm (Ω).

The first to sixth secondary windings 63, 66, 69, 73, 76, and 79 of the positive-phase and negative-phase three-phase reactors 6 </ b> A and 6 </ b> B are connected to the three-phase bridge rectifier circuit 7 and three-phase bridge rectification. The commutation of circuit 7 is
(2nπ / 18) + α [rad] (n = 1, 2,..., 18)
Done at intervals.

  The α is a constant and is represented by the following formula (40). In formula (40), p = π.

  The sawtooth wave function f (θ) represented by the equation (39) is a part of a sine wave function.

  Further, the commutation timing in the rectifier 1 is determined regardless of the turn ratio between the primary winding and the secondary winding of the reactors 6A and 6B between the positive and negative three-phase interphase reactors 6A and 6B.

Further, commutation in the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C is performed 18 times during an electrical angle of 2π (rad), and the electrical angle is expressed by the following equation.
(2n−1) π / 18 [rad] (n = 1, 2,..., 18)

As a result, the rectifier 1 as a whole has a total of 54 commutations in the period of approximately (π / 27) during the electrical angle 2π (rad), and the first to third full-wave rectifier circuits and the three-phase bridge rectifier circuit. 7 is performed.
Table 1 shows the state of commutation in the rectifier 1.

  Table 1 shows the state of commutation in an electrical angle of 0 to π / 2 [rad], that is, in a range of 0 to 90 °. In Table 1, the electrical angle and the first to ninth AC connection terminals 53a, 53b, 53c, 54a, 54b, 54c, 55a, 55b of the first to third three-phase full-wave rectifier circuits 5A, 5B, 5C, This represents the relationship between the currents iax, ibx, icx, icy, iby, icy, iaz, ibz, and icz input to 55c and the secondary winding currents if, ig, and ih of the three-phase reactor. The currents input to the first to third AC connection terminals 53a, 53b, and 53c of the first three-phase full-wave rectifier circuit 5A are iax, ibx, and icx, respectively, and the second three-phase full-wave rectifier circuit 5B The currents input to the fourth to sixth AC connection terminals 54a, 54b, and 54c are assumed to be iay, iby, and icy, respectively, and the seventh to ninth AC connection terminals 55a, 55b, and 55c of the third three-phase full-wave rectifier circuit 5C. The currents input to are respectively iaz, ibz, and icz.

  In Table 1, the case where a current flows from the phase-shifting transformer 4 to the reactor between the three-phase phases is represented by a symbol “+”, and the case where a current flows from the phase-shifting transformer 4 to the reactor between the three-phase phases is represented by a symbol “−”. When no current flows, it is represented by “0”. In this way, in a set of currents iax, ibx and icx input to the first three-phase full-wave rectifier circuit 5A at a predetermined electrical angle, any two of iax, ibx and icx are different signs. And the others are zero (0). Further, in the set of currents iay, iby and icy input to the second three-phase full-wave rectifier circuit 5B, any two of iay, iby and icy have different signs, and the others are zero (0). In the set of currents iaz, ibz, and icz input to the third three-phase full-wave rectifier circuit 5C, any two of iaz, ibz, and icz have different signs, and the others are zero (0).

  In Table 1, any two of if, ig, and ih have different signs of current values, that is, the direction of current flow is reversed, and the others are zero (0). If, ig, and ih are 2Nid / 3 or -2Nid / 3 if not zero (0). When current flows from the three-phase bridge rectifier circuit 7 to the reactor between the three-phase phases, it is expressed by adding − (minus) to the current value.

  As shown in Table 1, in the first to third three-phase full-wave rectifier circuits 5A, 5B, 5C, commutation occurs every 60 °. Therefore, six commutations occur in the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C during the electrical angle 2π. In the three-phase bridge rectifier circuit 7, a current is generated at a position that divides the electrical angle at which commutation occurs in the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C into three equal parts. In the meantime, 36 commutations occur. Therefore, it can be seen that 6 × 3 + 36 = 54 commutations occur as a whole.

  When the turn ratio N is selected to be close to 1/3, the first to third first commutation occurs at the time when the first commutation occurs in the first to third full-wave rectifier circuits 5A, 5B, and 5C. The amount of current in the full-wave rectifier circuits 5A, 5B, 5C can be further reduced to 1/3 of id / 3. As a result, the current discontinuity due to commutation can be further reduced, and the harmonic distortion rate can be further reduced. The amount of current that is reduced during commutation is distributed to the first to third full-wave rectifier circuits 5A, 5B, and 5C where no commutation occurs.

A DC voltage generated by the rectifier 1 will be described.
The output voltage Vp−Vn of the rectifier 1 when the positive-side and negative-side three-phase reactors 6A and 6B have no secondary winding is given by the following equation (41), and the period is 2π / 18 = π / 9. Is a periodic function of

  The rectified voltage of the secondary winding of the three-phase reactor is given by the following equations (42) and (43).

  In Equation (42) and Equation (43), when the winding ratio N is selected to be 1/3, the AC input current is equivalent to 54 pulses, that is, displaced in 54 steps in one cycle, and the AC input current is changed by a sine wave waveform. The rectifier 1 that can be brought closer is obtained.

  9 to 14 are charts showing current or voltage waveforms of the respective parts when the rectifying device 1 is operated. Here, the rated voltage of the alternating voltage of the alternating voltage power supply is 1 volt (V), and the direct current of the direct current load 3 is 1 ampere (A).

  FIG. 9 is a chart showing waveforms of the primary side winding voltages of the reactors 6A and 6B between the positive phase side and the negative phase side three-phase. Here, a voltage with the neutral point of the staggered connection of the reactor between the three-phase phases as a reference potential is represented. FIG. 9 shows waveform diagrams of Vpx-Vpf, Vpy-Vpg, Vpz-Vph, Vnx-Vnf, Vny-Vng, and Vnz-Vnh. In the chart of FIG. 9, the vertical axis represents the voltage value, and the horizontal axis represents the electrical angle ωt. The unit of voltage is volt (V), and the unit of electrical angle is degree (°). In the chart of FIG. 9, the Vpx-Vpf waveform is indicated by a thick dotted line, the Vpy-Vpg waveform is indicated by a thin solid line, the Vpz-Vph waveform is indicated by a bold two-dot chain line, and Vnx-Vnf is indicated by a bold line. It is indicated by a solid line, Vny-Vng is indicated by a thin two-dot chain line, and Vnz-Vnh is indicated by a thin one-dot chain line. Vpx-Vpf, Vpy-Vpg, Vpz-Vph, Vnx-Vnf, Vny-Vng and Vnz-Vnh can each be expressed by a periodic function having a period of 120 °.

  FIG. 10 is a chart showing the waveform of the input voltage of the three-phase bridge rectifier circuit 7. FIG. 10 shows waveforms of Vf−Vg, Vg−Vh, and Vh−Vf. In the chart of FIG. 10, the vertical axis represents the voltage value, and the horizontal axis represents the electrical angle ωt. The unit of voltage is volt (V), and the unit of electrical angle is degree (°). In the chart of FIG. 10, Vf-Vg is indicated by a one-dot chain line, Vg-Vh is indicated by a solid line, and Vh-Vf is indicated by a two-dot chain line. Vf−Vg, Vg−Vh, and Vh−Vf can be expressed by a periodic function of a 60 ° period having a phase difference of 20 ° from each other.

  FIG. 11 is a chart showing a waveform of the secondary side winding current of the three-phase reactor. FIG. 11 shows waveforms of If, Ig, and Ih. In the chart of FIG. 11, the vertical axis represents the current value, and the horizontal axis represents the electrical angle ωt. The unit of current is ampere (A), and the unit of electrical angle is degree (°). In the chart of FIG. 11, the waveform of If is indicated by a solid line, the waveform of Ig is indicated by a one-dot chain line, and the waveform of Ih is indicated by a two-dot chain line. When the current value is positive, current flows from the three-phase reactor to the three-phase bridge rectifier circuit 7, and when the current value is negative, current flows from the three-phase bridge rectifier circuit 7 to the three-phase reactor. Flowing. If, Ig, and Ih are represented by a periodic function having a period of 60 ° having a phase difference of 20 ° from each other.

  FIG. 12 is a chart showing waveforms of DC output currents of the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C. In FIG. 12, waveforms of Ipx, Ipy and Ipz are shown. In the chart of FIG. 12, the vertical axis represents the current value, and the horizontal axis represents the electrical angle ωt. The unit of current is ampere (A), and the unit of electrical angle is degree (°). In the chart of FIG. 12, the Ipx waveform is indicated by a solid line, the Ipy waveform is indicated by a one-dot chain line, and the Ipz waveform is indicated by a two-dot chain line. Ipx, Ipy and Ipz are represented by a periodic function having a period of 60 ° having a phase difference of 20 ° from each other.

  FIG. 13 is a chart showing waveforms of currents supplied to the fourth to sixth AC connection terminals 54a, 54b, 54c of the second three-phase full-wave rectifier circuit 5B. FIG. 13 shows waveforms of Iay, Iby, and Icy. In the chart of FIG. 13, the vertical axis represents the current value, and the horizontal axis represents the electrical angle ωt. The unit of current is ampere (A), and the unit of electrical angle is degree (°). In the chart of FIG. 13, the waveform of Iay is indicated by a solid line, the waveform of Iby is indicated by a one-dot chain line, and the waveform of Icy is indicated by a two-dot chain line. When the current value is a positive value, a current flows from the phase shift transformer 4 to the second three-phase full-wave rectifier circuit 5B, and when the current value is a negative value, the second three-phase full-wave rectifier circuit. A current flows from 5B to the phase shift transformer 4. Iay, Iby and Icy are represented by a periodic function having a period of 180 ° having a phase difference of 120 ° with respect to each other.

  The waveforms of the currents Iax, Ibx, and Icx supplied to the first to third AC connection terminals of the first three-phase full-wave rectifier circuit 5A are 20 ° each of the waveforms of Iay, Iby, and Icy shown in FIG. The waveform is advanced. The waveforms of the currents Iaz, Ibz, and Icz supplied to the seventh to ninth AC connection terminals of the third three-phase full-wave rectifier circuit 5C are 20 ° each of the waveforms of Iay, Iby, and Icy shown in FIG. The waveform is delayed in phase.

  FIG. 14 is a diagram illustrating waveforms of currents Ia, Ib, and Ic supplied to the rectifier 1 from the first to third power supply terminals Da, Db, and Dc of the three-phase AC power supply 2. In the chart of FIG. 14, the vertical axis represents the current value, and the horizontal axis represents the electrical angle ωt. The unit of current is ampere (A), and the unit of electrical angle is degree (°). In the chart of FIG. 14, the waveform of Ia is indicated by a thick solid line, the waveform of Ib is indicated by a thin solid line, and the waveform of Ic is indicated by a one-dot chain line. When the current value is a positive value, a current flows from the three-phase AC power source 2 to the rectifier 1, and when the current value is a negative value, a current flows from the rectifier 1 to the three-phase AC power source 2. The currents Ia, Ib, and Ic may be referred to as AC input currents.

  As shown in FIG. 14, when the three-phase alternating current is converted into direct current by the rectifying device 1 of the present invention, the waveform of the three-phase alternating current supplied from the three-phase alternating current power source 2 to the rectifying device 1 An alternating current waveform is obtained, that is, 54 pulses are rectified. As described above, the waveform of the three-phase alternating current input from the three-phase alternating current power supply 2 can be made closer to a sine wave, so that harmonics included in the three-phase alternating current supplied from the three-phase alternating current power supply 2 can be reduced. it can. In the rectifier 1 of the present invention, the total harmonic distortion factor (abbreviated as THD) of the voltage is 3.4 percent (%). That is, the generation of harmonics can be reduced as compared with the 18-pulse rectifier 1 of the third prior art.

  In the rectifier 1, the ripple of the DC voltage (load voltage) applied to the DC load 3 can be reduced. For example, when a filter capacitor is connected in parallel to the DC load 3, the capacitance of the filter capacitor is The rectifier circuit can be made smaller than the conventional rectifier circuit. Further, the rectifier 1 described above uses only a diode that is a passive element as an element constituting the first to third three-phase full-wave rectifier circuits 5A, 5B, 5C and the three-phase bridge rectifier circuit 7, The active element included in the rectifier 1 of the prior art and the control circuit for driving the active element are not provided. Since passive elements such as diodes are not easily broken by overcurrent, the failure of the rectifying device 1 can be reduced, and maintenance management of the rectifying device 1 is facilitated.

  Table 2 shows the capacities of the transformers of the rectifier 1, that is, the phase-shifting transformer 4 and the reactors 6A and 6B between the positive and negative three-phase phases in terms of the ratio to the total output capacity.

  The ratio to the total output capacity means that when the predetermined AC power is rectified by an insulated transformer, the predetermined AC power is rectified according to the present embodiment with respect to the capacity required by the insulated transformer. It is the ratio of the capacity of each transformer required when rectifying by the device 1. As shown in Table 2, in the rectifier 1 of the present embodiment, rectification can be performed with a capacity of 26.5% of the insulation type transformer as compared with the case where the insulation type transformer is used. Therefore, the size and weight of each transformer can be reduced, and the rectifier 1 can be miniaturized.

  Next, the result of simulating the operation of the rectifier 1 described above will be described. For example, in the rated voltage 440 volt (V) system, the DC voltage is expected to be around 600 volt (V). Assuming that the on-voltage of the rectifying device 1 is about 1.4V, the on-loss of about 2.8V is caused only by the rectifying device 1, but as described above, the phase-shifting transformer 4 and the positive-phase and negative-side three-phase reactor 6A , 6B itself can have a capacity of about 1/4 to 1/5 in the case of using an insulated transformer. Assuming that the transformer loss is proportional to the 0.75th power, the transformer loss is about 0.302 times that when the insulated phase shift transformer 4 is used. Assuming that the polyphase AC circuit to be compared uses a transformer with 99% (%) efficiency, the efficiency improvement associated with the reduction in transformer loss is about 0.7% (%).

  Therefore, the total efficiency in the 440V system is about the same as that of the insulated transformer even if the capacity is about 1/4 to 1/5 of the insulated transformer. Therefore, even when compared with a transformer using an insulating transformer, the apparatus can be miniaturized without reducing the efficiency. The rectifier 1 of the present invention can be suitably used when rectifying a relatively high three-phase AC voltage of, for example, 440 volts (V) or more.

  In another embodiment of the present invention, in the above-described phase shift transformer 4, the first phase shift transformer primary winding 12 and the first to fourth phase shift transformer secondary windings 13 to 16, The second phase shift transformer primary winding 17 and the fifth to eighth phase shift transformer secondary windings 18 to 21, the third phase shift transformer primary winding 22 and the ninth to ninth phases. The twelve phase shift transformer secondary windings 23 to 26 may be configured to be wound around separate iron cores.

  In still another embodiment of the present invention, in the positive-side three-phase reactor 6A described above, the first and second primary windings 61 and 62, the first secondary winding 63, The fourth primary windings 64 and 65 and the second secondary winding 66, and the fifth and sixth primary windings 67 and 68 and the third secondary winding 69 are provided in separate iron cores. You may wrap and comprise.

  In still another embodiment of the present invention, in the negative side three-phase reactor 6B described above, the seventh and eighth primary windings 71 and 72, the fourth secondary winding 73, The tenth primary windings 74 and 75 and the fifth secondary winding 76, and the eleventh and twelfth primary windings 77 and 78 and the sixth secondary winding 79 are provided in separate iron cores. You may wrap and comprise.

  In still another embodiment of the present invention, the DC load 3 and the DC reactor 8 include the first to sixth primary windings 61, 62, 64, 65, 67, 68 of the positive-phase three-phase reactor 6A. May be connected in series between the neutral point Po of the staggered connection and the three-phase bridge negative electrode terminal 88.

  Further, in the rectifier 1 of the present invention, the phase shift transformer 4, the first to third three-phase full-wave rectifier circuits 5A, 5B, 5C, the positive and negative three-phase reactors 6A and 6B, and the three-phase bridge rectifier. Terminals may be formed at connection portions to which the circuit 7 is connected, and the terminals may be detachably connected by a conductive member such as a conductive wire.

  In the present embodiment, in the positive side three-phase reactor 6A, the other end portion 61b of the first primary winding 61 and the other end portion 68b of the sixth primary winding 68 are connected to each other. The other end 62b of the second primary winding 62 and the other end 64b of the third primary winding 64 are connected to each other, and the other end 65b of the fourth primary winding 65 and the fifth The other end portion 67b of the primary winding 67 is connected to each other, and the other end portion 71b of the seventh primary winding 71 and the twelfth primary winding in the negative-phase-side three-phase reactor 6A. The other end 78b of the line 78 is connected to each other, the other end 72b of the eighth primary winding 72 and the other end 74b of the tenth primary winding 74 are connected to each other, and the tenth The other end portion 75b of the primary winding 75 and the other end portion 77b of the eleventh primary winding 77 are connected to each other. In the reactor 6A, the other end 61b of the first primary winding 61 and the other end 64b of the fourth primary winding 64 are connected to each other, and the other end of the second primary winding 62 is connected. The part 62 b and the other end part 67 b of the fifth primary winding 67 are connected to each other, and the other end part 63 b of the third primary winding 63 and the other end part 68 b of the sixth primary winding 68. And the other end 71b of the seventh primary winding 71 and the other end 74b of the eleventh primary winding 74 are connected to each other in the negative-positive-side three-phase reactor 6A. The other end 72b of the eighth primary winding 72 and the other end 77b of the eleventh primary winding 77 are connected to each other, and the other end 73b of the ninth primary winding 73 The other end 78b of the twelfth primary winding 78 may be connected to each other. Even if it connects in this way, the same effect can be achieved.

In still another embodiment of the present invention, a filter capacitor (Filter) is connected to the DC load 3.
Capacitor (abbreviation FC) may be connected in parallel. By connecting the filter capacitor, the DC voltage applied to the DC load 3 can be further smoothed, and the voltage ripple can be further suppressed.

  FIG. 15 is a circuit diagram showing a configuration of the rectifier 100 according to the embodiment of the present invention. Since the rectifying device 100 of the present embodiment includes the same configuration as that of the rectifying device 1 shown in FIG. 1 of the above-described embodiment, the corresponding configuration is denoted by the same reference numeral, and the description thereof will be given. Omitted. In FIG. 16, the three-phase AC power source 2, the DC load 3, and the filter capacitor (FC) 9 are shown together with the rectifier 100.

  The rectifier 100 includes a phase shift transformer 4, first to third three-phase full-wave rectifier circuits 5A, 5B, 5C, first and second current balancers 101A, 101B, a three-phase reactor 106, A three-phase bridge rectifier circuit 7 and a DC reactor 8 are included. The phase shift transformer 4 and the first to third three-phase full-wave rectifier circuits 5A, 5B, 5C are connected in the same manner as the rectifier 1 of the above-described embodiment.

  In the first and second current balancers 101A and 101B, the first to third three-phase full-wave rectifier circuits are caused by the DC output voltages of the first to third three-phase full-wave rectifier circuits 5A to 5C interfering with each other. The output current of 5A to 5C has a function of preventing a large fluctuation with time.

  The first current balancer 101A includes a first current balancer primary winding 102 having one end 102a connected to a first positive electrode terminal 51A serving as a positive electrode of a DC output of the first three-phase full-wave rectifier circuit 5A, A first current balancer secondary winding 103 corresponding to the current balancer primary winding 102 and having one end 103a connected to the first negative terminal 52A serving as the negative pole of the DC output of the first three-phase full-wave rectifier circuit 5A; Have The first current balancer primary winding 102 and the first current balancer secondary winding 103 are wound around the same iron core, and are coupled to each other by a magnetic field when a current flows. The first current balancer primary winding 102 and the first current balancer secondary winding 103 are additive. When the first current balancer 101A is disconnected from the rectifier 100 and a current is passed with one end 102a of the first current balancer primary winding 102 as a positive electrode and the other end 102b as a negative electrode, the first current balancer secondary winding 103 is provided. One end 103a of the first electrode serves as a positive electrode, and the other end 103b serves as a negative electrode.

  By providing the first current balancer 101A, the magnetic flux generated by the current from the positive electrode of the first three-phase full-wave rectifier circuit 5A flowing through the first current balancer primary winding 102, and the first three-phase The current to the negative electrode of the full-wave rectifier circuit 5A cancels out the magnetic flux generated by flowing through the first current balancer secondary winding 103, and the output current from the positive electrode of the first three-phase full-wave rectifier circuit 5A And the current value of the input current to the negative electrode is made equal. The voltage between the load side terminals of the first current balancer 101A, that is, the voltage between the other end 102b of the first current balancer primary winding 102 and the other end 103b of the first current balancer secondary winding 103 is Since the windings 102 and 103 of the first current balancer 101A have polarities that cancel each other's voltage when viewed from the first positive terminal 51A and the first negative terminal 52A of the first three-phase full-wave rectifier circuit 5A, 1 is equal to the output voltage of the three-phase full-wave rectifier circuit 5A, that is, the voltage between the first positive terminal 51A and the first negative terminal 52A.

The turn ratio between the number of turns Ng of the first current balancer primary winding 102 and the number of turns Nh of the first current balancer secondary winding 103 is expressed by the following equation (44).
Ng: Nh = 1: 1 (44)

  The second current balancer 101B includes a second current balancer primary winding 104 having one end 104C connected to a third positive electrode terminal 51C serving as a positive electrode of the DC output of the third three-phase full-wave rectifier circuit 5C, A second current balancer secondary winding 105 corresponding to the current balancer primary winding 104 and having one end 105C connected to the third negative terminal 52C serving as the negative pole of the DC output of the third three-phase full-wave rectification circuit 5C; Have The second current balancer primary winding 104 and the second current balancer secondary winding 105 are wound around the same iron core, and are coupled to each other by a magnetic field when a current flows. The second current balancer primary winding 104 and the second current balancer secondary winding 105 are additive. When the second current balancer 101B is disconnected from the rectifier 100 and a current is passed with one end 103a of the second current balancer primary winding 103 as a positive electrode and the other end 103b as a negative electrode, the second current balancer secondary winding 104 is provided. One end 104a is a positive electrode and the other end 104b is a negative electrode.

  By providing the second current balancer 101B, the magnetic flux generated when the current from the positive electrode of the third three-phase full-wave rectifier circuit 5C flows through the second current balancer primary winding 104, and the third three-phase The current to the negative electrode of the full-wave rectifier circuit 5C and the magnetic flux generated by flowing through the second current balancer secondary winding 105 cancel each other, and the output current from the positive electrode of the third three-phase full-wave rectifier circuit 5C And the current value of the input current to the negative electrode is made equal. The voltage between the load side terminals of the second current balancer 101B, that is, the voltage between the other end 104b of the second current balancer primary winding 104 and the other end 105b of the second current balancer secondary winding 105 is Since the windings 104 and 105 of the second current balancer 101 have polarities that cancel each other's voltage when viewed from the third positive terminal 51C and the third negative terminal 52C of the third three-phase full-wave rectifier circuit 5C, Output voltage of the three-phase full-wave rectifier circuit 5C, that is, the voltage between the third positive terminal 51C and the third negative terminal 52C.

The number of turns Ni of the second current balancer primary winding 104 and the number of turns Nj of the second current balancer secondary winding 105 and the number of turns are expressed by the following relational expression (45).
Ni: Nj = 1: 1 (45)

  The other end 103B of the first current balancer secondary winding 103 of the first current balancer 101A, the other end 105B of the second current balancer secondary winding 105 of the second current balancer 101B, and the second full-wave rectifier circuit 5B. The second negative terminal 52B is connected to each other. The number of turns Ng of the first current balancer primary winding 102 and the number of turns Nh of the first current balancer secondary winding 103, the number of turns Ni of the second current balancer primary winding 104, and the second current balancer secondary winding 105 are also shown. The number of turns Nj is selected equally, for example.

  By providing the first and second current balancers 101A and 101B, the output current from the positive electrode and the input current to the negative electrode of the first and third three-phase full-wave rectifier circuits 5A and 5B can be made equal to each other. The output current from the positive electrode and the input current to the negative electrode of the three-phase full-wave rectifier circuit 5B can be made equal. Hereinafter, when the first and second current balancers 101A and 101B are collectively referred to, they may be simply referred to as the current balancer 101.

  The three-phase interphase reactor 106 is an interphase transformer and includes first to third winding portions 110A, 110B, and 110C. One primary winding and two secondary windings are wound around the first to third winding portions 110A, 110B, and 110C, respectively.

  The first winding portion 110A is formed by winding a first primary winding 111, a first secondary winding 112, and a second secondary winding 113 around the same iron core. The first primary winding 111, the first secondary winding 112, and the second secondary winding 113 are coupled to each other by a magnetic field when a current flows. The first primary winding 111 and the first secondary winding 112 are depolarized, and the first primary winding 111 and the second secondary winding 113 are depolarized. When the first winding portion 110A is disconnected from the rectifier 100 and a current is passed with the one end 111a of the first primary winding 111 as a positive electrode and the other end 111b as a negative electrode, the first secondary winding 112 The winding end that is the positive electrode is the one end 111b of the first secondary winding 112, and the winding end that is the positive electrode in the second secondary winding 113 is the one end 113a of the second secondary winding 113. To do.

  The second winding portion 110B is formed by winding a second primary winding 114, a third secondary winding 115, and a fourth secondary winding 116 around the same iron core. The second primary winding 114, the third secondary winding 115, and the fourth secondary winding 116 are coupled to each other by a magnetic field when a current flows. The second primary winding 114 and the third secondary winding 115 are depolarized, and the second primary winding 114 and the fourth secondary winding are depolarized 116. When the second winding portion 110B is disconnected from the rectifying device 100 and a current is passed with the one end 114a of the second primary winding 114 as the positive electrode and the other end 114b as the negative electrode, the positive polarity is applied to the third secondary winding. The winding end that becomes the one end 115 a of the third secondary winding 115 and the winding end that becomes the positive electrode in the fourth secondary winding 116 become the one end 116 a of the fourth secondary winding 116. .

  The third winding portion 110C is formed by winding a third primary winding 117, a fifth secondary winding 118, and a sixth secondary winding 119 around the same iron core. The third primary winding 117, the fifth secondary winding 118, and the sixth secondary winding 119 are coupled to each other by a magnetic field when a current flows. The third primary winding 117 and the fifth secondary winding 118 are depolarized, and the third primary winding 117 and the sixth secondary winding 119 are depolarized. When the third winding portion 110C is disconnected from the rectifier 100 and a current is passed with one end 117a of the third primary winding 117 as a positive electrode and the other end 117b as a negative electrode, the fifth secondary winding 118 The winding end serving as the positive electrode is used as one end 118a of the fifth secondary winding 118, and the winding end serving as the positive electrode in the sixth secondary winding 119 is used as one end 119a of the sixth secondary winding 119. To do.

  The other end 102b of the first current balancer primary winding 102 of the first current balancer 101A is connected to one end 111a of the first primary winding 111 wound around the first winding portion 110A. The second positive terminal 51B of the second three-phase full-wave rectifier circuit 5B is connected to one end 114a of the second primary winding 114 wound around the second winding portion 110B. The other end 114b of the second current balancer primary winding 104 of the second current balancer 101B is connected to one end 117a of the third primary winding 117 wound around the third winding portion 110C. The other ends 111b, 114b, and 117b of the first to third primary windings 111, 114, and 117 wound around the first to third winding portions 110A, 110B, and 110C are connected to each other to form a Y connection ( Star connection). Accordingly, the other end 102b of the first current balancer primary winding 102 of the first current balancer 101A, the second positive terminal 51B of the second three-phase full-wave rectifier circuit 5B, and the second current balancer 101B of the second current balancer 101B. The other end 104b of the current balancer primary winding 104 is connected to the neutral point Qo of the Y connection by the first to third primary windings 111, 114, and 117 of the three-phase reactor.

  The other end 112b of the first secondary winding 112 wound around the first winding portion 110A and one end 116a of the fourth secondary winding 116 wound around the second winding portion 110B The first secondary winding 112 and the fourth secondary winding 116 are connected to each other in series. Further, the other end 115b of the third secondary winding 115 wound around the second winding portion 110B and one end 119a of the sixth secondary winding 119 wound around the third winding portion 110C are provided. The third secondary winding 115 and the sixth secondary winding 119 are connected to each other in series. Further, the other end 118b of the fifth secondary winding 118 wound around the third winding portion 110C and one end 113a of the second secondary winding 113 wound around the first winding portion 110A are provided. The fifth secondary winding 118 and the second secondary winding 113 are connected in series with each other. The other ends 113b, 116b, 119b of the second, fourth and sixth second windings 113, 116, 119 are connected to each other, and the first to sixth secondary windings 112, 113, 115, 116, 118, and 119 are staggered. Hereinafter, when the first to third primary windings 111, 114, 117 are collectively referred to as a primary winding, the first to sixth secondary windings 112, 113, 115, 116, 118 are described. , 119 may be simply described as a secondary winding.

The turn ratio of each winding in the first to third winding portions 110A, 110B, and 110C is expressed by the following equations (46) to (49). Here, the number of turns of the first to third primary windings 111, 114, and 117 is Ng1 to Ng3, respectively, and the number of turns of the first to sixth secondary windings 112, 113, 115, 116, 118, and 119 is set. Are Nh1 to Nh6, a predetermined fifth constant is Ke, and a predetermined sixth constant is Kf.
Ng1: Ng2: Ng3 = 1: 1: 1 (46)
Ng1: Nh1: Nh2 = 1: Ke: Kf (47)
Ng2: Nh3: Nh4 = 1: Ke: Kf (48)
Ng3: Nh5: Nh6 = 1: Ke: Kf (49)

  The predetermined fifth constant Ke is selected, for example, as 0.22, and the predetermined sixth constant Kf is selected as, for example, 0.11.

  The three-phase bridge rectifier circuit 7 includes a neutral point Qo of Y connection by the first to third primary windings 111, 114, and 117 of the three-phase interphase reactor 106, and a first 2 of the first current balancer 101A. Connected in series between the other end 103b of the secondary winding 102, the other end 105b of the second secondary winding 105 of the second current balancer 101B, and the second negative terminal 52B of the second full-wave rectifier circuit 5B. Is done. The neutral point Qo of Y connection by the first to third primary windings 111, 114, and 117 of the three-phase interphase reactor 106 is connected to the three-phase bridge negative terminal 88 of the three-phase bridge rectifier circuit 7.

  One end 112 a of the first secondary winding 112 of the three-phase interphase reactor 106 is connected to the first bridge AC connection terminal 89 a of the three-phase bridge rectifier circuit 7. One end 115 a of the third secondary winding 115 of the three-phase reactor 106 is connected to the second bridge AC connection terminal 89 b of the three-phase bridge rectifier circuit 7. One end 118 a of the fifth secondary winding 118 of the three-phase reactor 106 is connected to the third bridge AC connection terminal 89 c of the three-phase bridge rectifier circuit 7.

  A three-phase bridge positive terminal 87 of the three-phase bridge rectifier circuit 7 is connected to one end 3 a of the DC load 3 through a DC reactor 8. The DC reactor 8 is connected in series with the three-phase bridge rectifier circuit 7. One end 8 a of the DC reactor 8 is connected to the three-phase bridge positive terminal 87 of the three-phase bridge rectifier circuit 7. The other end 8 b of the DC reactor 8 is connected to one end 3 a of the DC load 3, in other words, a positive electrode side terminal of the DC load 3.

  The filter capacitor 9 is connected in series to the three-phase bridge rectifier circuit 7 and is connected in parallel to the DC load 3. One connection terminal 9 a of the filter capacitor 9 is connected to the other end 8 b of the DC reactor 8 and is connected to the three-phase bridge positive terminal 87 of the three-phase bridge rectifier circuit via the DC reactor 8. The other connection terminal 9b of the filter capacitor 9 is connected to the other end 103b of the first secondary winding 103 of the first current balancer 101A, the other end 105b of the second secondary winding 105 of the second current balancer 101B, and It is connected to the second negative terminal 52B of the second full-wave rectifier circuit 5B.

  The operation of the rectifier 100 will be described below. Since the first to third primary windings 111, 114, 117 Y-connected to the three-phase reactor 106 have the same number of turns, the first to sixth secondary windings 112, 113, 115, 116 are provided. , 118, 119, each of which is connected to one end 111 a, 114 a, 117 a of each of the first to third primary windings 111, 114, 117 of the three-phase reactor 106 when the current flowing through the reactor is zero (0). It functions to equalize the output currents of the phase full-wave rectifier circuits 5A to 5C.

The three phases of the neutral point Qo of the first to third primary windings 111, 114, and 117 Y-connected of the three-phase reactor 106, which is the voltage Vdx on the primary output side of the three-phase reactor 106. The voltage with respect to the negative electrodes of the full-wave rectifier circuits 5A to 5C is the voltage applied between the terminals of the first to third primary windings 111, 114, 117, that is, the outputs of the three-phase full-wave rectifier circuits 5A to 5C. The average value of the voltage is expressed by the following formula (50). In Expression (50), the DC output voltage of the first three-phase full-wave rectifier circuit 5A is Vd1, the DC output voltage of the second three-phase full-wave rectifier circuit 5B is Vd2, and the third three-phase full-wave rectifier The DC output voltage of the circuit 5C is Vd3.
Vdx = (Vd1 + Vd2 + Vd3) / 3 (50)

  FIG. 16 is a chart showing waveforms of output voltages Vd1, Vd2, and Vd3 of the first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C and a voltage Vdx on the primary output side of the three-phase reactor 106. is there. In the chart of FIG. 19, the vertical axis represents values obtained by dividing each voltage by the voltage Vab between the first power supply terminal Da and the second power supply terminal Db, which are output terminals of the three-phase AC power supply 2, and the horizontal axis represents the electrical angle ωt. Represents. The unit of electrical angle is degree (°). In the chart of FIG. 19, the waveform of Vd1 is indicated by a thick solid line, the waveform of Vd2 is indicated by a two-dot chain line, the waveform of Vd3 is indicated by a dotted line, and the waveform of Vdx is indicated by a thin solid line. Vd1, Vd2 and Vd3 are represented by a periodic function with a period of 60 ° having a phase difference of 20 ° with respect to each other. As can be seen from FIG. 16, Vdx is represented by a periodic function having a cycle of 20 °, and it can be seen that the voltage variation is suppressed and becomes smaller.

The voltages applied to the primary windings 111, 114, and 117 of the three-phase interphase reactor 106 are expressed by equations (51) to (52), respectively. Here, the voltage applied to the first primary winding 111 is V3xa, the voltage applied to the second primary winding 114 is V3ya, and the voltage applied to the third primary winding 117. Is V3za.
V3xa = Vd1-Vdx = (2Vd1-Vd2-Vd3) / 3 (51)
V3ya = Vd2-Vdx = (-Vd1-2-2Vd2-Vd3) / 3 (52)
V3za = Vd3-Vdx = (-Vd1-Vd2-2Vd3) / 3 (53)

  FIG. 17 is a chart showing a waveform of a voltage applied to each primary winding 1 of the three-phase interphase reactor 106. In the chart of FIG. 19, the vertical axis represents values obtained by dividing each voltage by the voltage Vab between the first power supply terminal Da and the second power supply terminal Db, which are output terminals of the three-phase AC power supply 2, and the horizontal axis represents the electrical angle ωt. Represents. The unit of electrical angle is degree (°). In the chart of FIG. 17, the voltage applied to the first primary winding 111 is indicated by a solid line with a waveform of V3xa, and the voltage applied to the second primary winding 114 is indicated by a two-dot chain line. The voltage applied to the third primary winding 117 is shown by the dotted line of the waveform of V3za. V3xa, V3ya and V3za are represented by a periodic function with a period of 60 ° having a phase difference of 20 ° with respect to each other.

  The secondary windings 112, 113, 115, 116, 118, and 119 of the three-phase interphase reactor 106 are staggered as described above, and the terminals 112a and 115a of the first, third, and fifth secondary windings are connected. And 118a are connected to the first to third bridge AC connection terminals 89a, 89b, 89c of the three-phase bridge rectifier circuit 7, respectively. In this manner, the waveform and phase of the voltage to be used can be adjusted by staggering the secondary windings 112, 113, 115, 116, 118, and 119. The combinations of the connections of the secondary windings 112, 113, 115, 116, 118, and 119 are linked in order of the phase of the AC power supply voltage. When the phase rotation is reversed, the combination is changed by Can respond.

  FIG. 18 is a chart showing the secondary side voltage of full-phase reactor 106 and the waveform of the full-wave rectified voltage thereof. The voltage between the first bridge AC connection terminal 89a and the neutral point Qn of each secondary winding of the three-phase reactor 106 is Vxn, and each of the second bridge AC connection terminal 89b and the three-phase reactor 106 is The voltage between the neutral point Qn by the secondary winding is Vyn, and the voltage between the third bridge AC connection terminal 89c and the neutral point Qn by each secondary winding of the interphase reactor 106 is Vzn. And The output voltage of the three-phase bridge rectifier circuit 7 is Vm. In the chart of FIG. 18, the vertical axis represents a value obtained by dividing each voltage by the voltage Vab between the first power supply terminal Da and the second power supply terminal Db, which are output terminals of the three-phase AC power supply 2, and the horizontal axis represents the electrical angle ωt. Represents. The unit of electrical angle is degree (°).

  In the chart of FIG. 18, the Vxn waveform is indicated by a thick solid line, the Vyn waveform is indicated by a two-dot chain line, the Vzn waveform is indicated by a dotted line, and the Vm waveform is indicated by a thin solid line. The waveforms of Vxn, Vyn and Vzn are represented by a periodic function with a period of 60 ° having a phase difference of 20 ° with respect to each other. Vm is represented by a periodic function with a period of 20 °.

  The ripple ratio of the voltage Vdx applied to the three-phase bridge negative terminal 88 of the three-phase bridge rectifier circuit 7 and the voltage Vm output from the three-phase bridge rectifier circuit 7 by appropriately selecting the turns ratio of the three-phase interphase reactor 106 Are substantially equal to each other, and the phase difference is set to 180 °.

  19 shows the positive voltage Vd of the three-phase bridge rectifier circuit 7, the voltage Vdx applied to the three-phase bridge negative terminal 88 of the three-phase bridge rectifier circuit 7, and the output voltage of the three-phase bridge rectifier circuit 7 as Vm. It is a chart which shows a waveform. In the chart of FIG. 19, the vertical axis represents values obtained by dividing each voltage by the voltage Vab between the first power supply terminal Da and the second power supply terminal Db, which are output terminals of the three-phase AC power supply 2, and the horizontal axis represents the electrical angle ωt. Represents. The unit of electrical angle is degree (°). In the chart of FIG. 19, the waveform of Vdx is indicated by a solid line, the waveform of Vm is indicated by a dotted line, and the waveform of Vm is indicated by a dotted line.

  As shown in FIG. 19, since the frequencies of the voltage Vdx and the voltage Vm are the same for both ripples, the voltage Vd of the positive electrode of the three-phase bridge rectifier circuit 7, in other words, the voltage applied to the DC load 3 is extremely smooth. Voltage.

  When the secondary output of the three-phase reactor 106 is not connected to the three-phase bridge rectifier circuit 7, that is, when each secondary winding is not connected to the AC connection terminal of the three-phase bridge rectifier circuit 7, The output currents of the first to third three-phase full-wave rectifier circuits 5A to 5C are equal to 3% of the load current id by the current balance action of the first and second current balancers 101A and 101B and the action of the DC reactor 8. The smoothing current is 1 (1/3). When a current flows through each secondary winding of the three-phase interphase reactor 106, the current of each primary winding changes to a value that satisfies the equiampere-turn law in each of the first to third winding portions 110A to 110C. .

  Specifically, due to the action of the three-phase bridge rectifier circuit 7, the load current id flows into the secondary winding of the three-phase bridge rectifier circuit 7 from the terminal with the lowest voltage, and the terminal with the highest voltage of the secondary winding. Spill from. In the three-phase bridge rectifier circuit 7, one of the six energization paths is loaded depending on the voltage of the secondary circuit output terminal, that is, the voltage between the first to third bridge AC connection terminals 89a to 89c. Current flows. However, the commutation period is ignored here. Table 3 shows energization paths in the three-phase bridge rectifier circuit 7.

  In Table 3, AT is Ampere Turn. As shown in Table 3, there are six modes in the AT of the secondary windings of the winding portions 110A to 110C in the three-phase interphase reactor 106. However, in Table 3, the case where the magnetomotive force is generated in the same direction as the primary winding is represented by a plus (+) sign. Since the load current id can be regarded as a current source by the action of the DC reactor 8, the primary winding current of the three-phase reactor 106 reduces the change in the equal magnetic flux of the first to third winding portions 110A to 110C. To change.

  FIG. 20 is a chart showing a waveform of a secondary current of the three-phase interphase reactor 20. The current flowing through the first bridge AC connection terminal 89a of the three-phase bridge rectifier circuit 7 is Ix, the current flowing through the second bridge AC connection terminal 89b is Iy, and the current flowing through the third bridge AC connection terminal 89c is Iz. In the chart of FIG. 20, the vertical axis represents a value obtained by dividing each current by the load current id, and the horizontal axis represents the electrical angle ωt. The unit of electrical angle is degree (°). In the chart of FIG. 20, the waveform of Ix is indicated by a dotted line, the waveform of Iy is indicated by a solid line, and the waveform of Iz is indicated by a two-dot chain line. However, a current flowing from the three-phase reactor 106 to the three-phase bridge rectifier circuit 7 is represented as a positive direction, and a current flowing from the three-phase bridge rectifier circuit 7 to the three-phase reactor 106 is represented as a negative direction. The waveforms of Ix, Iy and Iz are represented by a periodic function with a period of 60 ° having a phase difference of 20 ° with respect to each other.

  FIG. 21 is a diagram illustrating a waveform of a direct current output from the first to third three-phase full-wave rectifier circuits 5A to 5C. The waveform shown in FIG. 24 is obtained when Ke = 0.22 and Kf = 0.11. The current output from the positive electrode of the first three-phase full-wave rectifier circuit 5A is Ip1, the current output from the positive electrode of the second three-phase full-wave rectifier circuit 5B is Ip2, and the third three-phase full-wave rectifier The current output from the positive electrode of the circuit 5C is Ip3. In the chart of FIG. 21, the vertical axis represents a value obtained by dividing each current by the load current id, and the horizontal axis represents the electrical angle ωt. The unit of electrical angle is degree (°). In the chart of FIG. 20, the waveform of Ip1 is indicated by a solid line, the waveform of Ip2 is indicated by a two-dot chain line, and the waveform of Ip3 is indicated by a dotted line. The waveforms of Ip1, Ip2 and Ip3 are represented by a periodic function with a period of 60 ° having a phase difference of 20 ° with respect to each other.

  As shown in FIG. 20, the secondary current of the three-phase interphase reactor 106 is repeated at a frequency cycle that is six times the power supply frequency. As shown in FIG. 21, the three-phase full-wave rectifier circuits 5 </ b> A to 5 </ b> C Since the output current passes through six modes during one cycle of the secondary current of the three-phase reactor 106, the current value changes 36 times during one cycle of the power supply frequency. By distributing the current change timing almost evenly between the commutation timings of the first to third three-phase full-wave rectifier circuits 5A to 5C, the waveform of one cycle becomes 18 + 36 = 54 stages. The power supply current can be 54 pulses. The AC input phase current waveforms to the first to third three-phase full-wave rectifier circuits 5A to 5C are the same as the waveforms shown in FIG.

  FIG. 22 is a diagram illustrating waveforms of currents Ia, Ib, and Ic supplied from the first to third power supply terminals Da, Db, and Dc of the three-phase AC power supply 2 to the rectifier 100. In the chart of FIG. 22, the vertical axis represents a value obtained by dividing each current by the load current id, and the horizontal axis represents the electrical angle ωt. The unit of electrical angle is degree (°). In the chart of FIG. 22, the waveform of Ia is indicated by a thin two-dot chain line, the waveform of Ib is indicated by a solid line, and the waveform of Ic is indicated by a one-dot chain line. When the value on the vertical axis is positive, current flows from the three-phase AC power source 2 to the rectifier 1, and when negative, current flows from the rectifier 1 to the three-phase AC power source 2.

  As described above, also in the rectifier 100, the same effect as that of the rectifier 1 of the above-described embodiment shown in FIG. 1 can be obtained.

  Table 4 shows the capacities of the transformers of the rectifier 100, that is, the phase-shifting transformer 4 and the three-phase reactor 106 and the first and second current balancers 101A and 101B in a ratio to the total output capacity.

  As shown in Table 4, in the rectifier of the present embodiment, rectification can be performed with a capacity of 23.7 percent (%) of the insulation type transformer as compared with the case where the insulation type transformer is used. . Therefore, the size and weight of each transformer can be reduced, and the rectifier can be miniaturized.

  In still another embodiment of the present invention, the three-phase full-wave rectifier circuit to which the first and second current balancers 101A and 101B are connected may be arbitrarily selected. In the present embodiment, the first and second current balancers 101A and 101B are connected to the first and third three-phase full-wave rectifier circuits 5A and 5C, respectively. 101B may be connected to first and second three-phase full-wave rectifier circuits 5A and 5B, or second and third three-phase full-wave rectifier circuits 5B and 5C, respectively. Even if it is such a structure, the same effect can be achieved. Moreover, you may connect the current balancer of the structure similar to 1st and 2nd current balancer 101A, 101B to all the 1st-3rd three-phase full wave rectifier circuits 5A-5C.

  The waveform distortion rate of the AC input current of the rectifier 100 of the present embodiment is substantially the same as that of the rectifier 1 shown in FIG.

  In still another embodiment of the present invention, the DC reactor 8 and the DC load 3 are the first to third primary of the three-phase bridge negative terminal 88 of the three-phase bridge rectifier circuit 7 and the three-phase correlation reactor 106. You may connect in series between neutral point Qo of Y connection by winding 111,114,117.

  In still another embodiment of the present invention, one end 111 a of the first primary winding 111 is connected to one end 103 b of the first current balancer secondary winding 103, and the second primary winding 114. One end 114 a of the third primary winding 117 is connected to the second negative terminal 52 B of the second three-phase full-wave rectifier circuit 5 A, and one end 117 a of the third primary winding 117 is connected to the second current balancer secondary winding 105. Connected to one end 105b, the neutral point Qo is connected to the positive electrode of the DC output of the three-phase bridge rectifier circuit 7, and connected to one end 102b of the first current balancer primary winding 102 and the second three-phase The second positive terminal 51B of the full-wave rectifier circuit 5A and the one end 104b of the second current balancer primary winding 104 may be connected to the negative terminal of the DC output of the three-phase bridge rectifier circuit 7. In this case, the DC load 3 includes a DC output positive electrode of the three-phase bridge rectifier circuit 7 and a neutral point Qo or a DC output negative electrode of the three-phase bridge rectifier circuit 7 and the first current balancer primary winding. A DC reactor is connected between one end 102b of the line 102, the second positive terminal 51B of the second three-phase full-wave rectifier circuit 5A, and a connection portion to which one end 104b of the second current balancer primary winding 104 is connected. 8 are connected in series. Even if it is such a structure, the same effect can be achieved.

  In still another embodiment of the present invention, the other end 112b of the first secondary winding 112 and the one end 119a of the sixth secondary winding 119 are connected to each other, and the third secondary winding. 115, the other end 115b of the second secondary winding 113 and one end 113a of the second secondary winding 113 are connected to each other, and the other end 118b of the fifth secondary winding 118 and one end 116a of the fourth secondary winding 116 are connected. The other ends 113b, 116b, and 119b of the second, fourth, and sixth secondary windings 113, 116, and 119 may be connected to each other and staggered. Even if it is such a structure, the same effect can be achieved.

In still another embodiment of the present invention, the number of turns Ng of the first current balancer primary winding 102, the number of turns Nh of the first current balancer secondary winding 103, and the number of turns Ni of the second current balancer primary winding 104 are shown. The number of turns Nj of the second current balancer secondary winding 105 may be different.
In still another embodiment of the present invention, a current balancer having the same configuration as that of the first and second current balancers 101A and 101B is connected to each of the first to third three-phase full-wave rectifier circuits 5A to 5C. The current balancer may be connected to any two of the three three-phase full-wave rectifier circuits. That is, in the present embodiment, a current balancer is connected to the first and third three-phase full-wave rectifier circuits 5A and 5C, but the current balancer is connected to the first and second three-phase full-wave rectifier circuits 5A and 5C. The same effect can be obtained by connecting to 5B or connecting to the second and third three-phase full-wave rectifier circuits 5B and 5C, respectively. In still another embodiment of the present invention, the rectifier 100 may be formed by combining the above-described components.

  FIG. 23 is a circuit diagram showing a configuration of a rectifier 120 according to an embodiment of the present invention. Since the rectifying device 120 of the present embodiment includes the same configuration as the rectifying devices 1 and 100 shown in FIGS. 1 and 15 of the above-described embodiment, the corresponding reference numerals are assigned to the corresponding configurations. The description is omitted.

  The rectifier 100 includes a phase shift transformer 4, first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C, first and second current balancers 101A and 101B, a three-phase reactor 126, A three-phase bridge rectifier circuit and a DC reactor 8 are included. The rectifier 120 of the present embodiment has a configuration in which the three-phase reactor 106 of the rectifier 100 shown in FIG. 16 of the above-described embodiment is replaced with a three-phase correlation reactor 126, and the other configuration is the same as that of the rectifier 100. It is the same.

  The three-phase interphase reactor 126 is an interphase transformer, and includes first to third winding portions 130A, 130B, and 130C. Two primary windings and one secondary winding are wound around the first to third winding portions 130A, 130B, and 130C, respectively. The first winding portion 130A is formed by winding a first primary winding 131, a second primary winding 132, and a first secondary winding 132 around the same iron core.

  The first primary winding 131, the second primary winding 132, and the first secondary winding 133 are coupled to each other by a magnetic field when a current flows. The first primary winding 131 and the first secondary winding 133 are depolarized, and the second primary winding 132 and the first secondary winding 133 are additive. When the first winding portion 130A is disconnected from the rectifier 120 and a current is passed with one end 131a of the first primary winding 131 as a positive electrode and the other end 131b as a negative electrode, the first secondary winding 133 The winding end that becomes the positive electrode is the one end 133a of the first secondary winding 133, and the winding end that becomes the positive electrode in the second primary winding 132 is the one end 132a of the second primary winding 132. To do.

  The second winding portion 130B is formed by winding a third primary winding 134, a fourth primary winding 135, and a second secondary winding 136 around the same iron core. The third primary winding 134, the fourth primary winding 135, and the second secondary winding 136 are coupled to each other by a magnetic field when a current flows. The third primary winding 134 and the second secondary winding 135 are depolarized, and the fourth primary winding 135 and the second secondary winding 136 are additive. When the second winding portion 130B is disconnected from the rectifier 120 and a current is passed with one end 134a of the third primary winding 134 as a positive electrode and the other end 134b as a negative electrode, the second secondary winding 136 The winding end serving as the positive electrode is defined as one end 136a of the second secondary winding 136, and the winding end serving as the positive polarity in the fourth primary winding 135 is defined as one end 135a of the fourth primary winding 135. To do.

  The third winding portion 130C is formed by winding a fifth primary winding 137, a sixth primary winding 138, and a third secondary winding 139 around the same iron core. The fifth primary winding 137, the sixth primary winding 138, and the third secondary winding 139 are coupled to each other by a magnetic field when a current flows. The fifth primary winding 137 and the third secondary winding 139 are depolarized, and the sixth primary winding 138 and the third secondary winding 139 are additive. When the third winding portion 130C is disconnected from the rectifier 120 and a current is passed with the one end 137a of the fifth primary winding 137 as the positive electrode and the other end 137b as the negative electrode, the third secondary winding 139 The winding end serving as the positive electrode is defined as one end 139a of the third secondary winding 139, and the winding end serving as the positive polarity in the sixth primary winding 138 is defined as one end 138a of the sixth primary winding 138. To do.

  The other end 131b of the first primary winding 131 wound around the first winding portion 130A and the other end 135b of the fourth secondary winding 135 wound around the second winding portion 130B Are connected to each other, and the first primary winding 131 and the fourth primary winding 135 are connected in series. The other end 134b of the third primary winding 134 wound around the second winding portion 130B and the other end 138b of the sixth primary winding 138 wound around the third winding portion 130C Are connected to each other, and the third primary winding 134 and the sixth primary winding 138 are connected in series. The other end 137b of the fifth primary winding 137 wound around the third winding portion 130C and the other end 132b of the second primary winding 132 wound around the first winding portion 130A Are connected to each other, and the fifth primary winding 137 and the second primary winding 132 are connected in series.

  One ends 132a, 135a, and 138a of the second, fourth, and sixth second windings 132, 135, and 138 are connected to each other, and the first to sixth primary windings 131, 132, 134, and 145 are connected. , 137, 138 are formed in a staggered connection. The other end 102b of the first primary winding 102 of the first current balancer 101A is connected to one end 131a of the first primary winding 131 wound around the first winding portion 130A. The second positive terminal 51B of the second three-phase full-wave rectifier circuit 5B is connected to one end 134a of the third primary winding 134 wound around the second winding part 130B. The other end 104b of the second primary winding 104 of the second current balancer 101B is connected to one end 137a of the fifth primary winding 137 wound around the third winding portion 130C. The other end 102b of the first primary winding 102 of the first current balancer 101A, the second positive terminal 51B of the second three-phase full-wave rectifier circuit 5B, and the second primary winding of the second current balancer 101B The other end 104b of the line 104 is connected to a neutral point Ro of the staggered connection by the first to sixth primary windings 131, 132, 134, 145, 137, and 138 of the three-phase interphase reactor 126. Hereinafter, when the first to sixth primary windings 131, 132, 134, 145, 137, and 138 are generically referred to, they may be simply referred to as primary windings.

  The other ends 133b, 136b, 139b of the first to third secondary windings 133, 136, 139 wound around the first to third winding portions 130A, 130B, 130C are connected to each other to form a Y connection. Is done. Hereinafter, when the first to third secondary windings 133, 136, and 139 are generically referred to, they may be simply referred to as “temporal windings”.

The turns ratio of each winding in the first to third winding portions 130A, 130B, and 130C is expressed by the following equations (54) to (57). Here, the number of turns of the first to sixth primary windings 131, 132, 134, 145, 137, and 138 is set to Ni1 to Ni6, respectively, and the number of turns of the first to third secondary windings 133, 136, and 139 is set. Are Nj1 to Nj3, a predetermined seventh constant is Kg, and a predetermined eighth constant is Kh.
Nj1: Nj2: Nj3 = 1: 1: 1 (54)
Ni1: Ni2: Nj1 = 1: Kg: Kh (55)
Ni3: Ni4: Nj2 = 1: Kg: Kh (56)
Ni5: Ni6: Nj3 = 1: Kg: Kh (57)

  The predetermined seventh constant Kg is selected as 1, for example, and the predetermined eighth constant Kh is selected as 0.33, for example.

  The three-phase bridge rectifier circuit 7 includes a neutral point Ro of the staggered connection formed by the first to sixth primary windings 131, 132, 134, 145, 137, and 138 of the three-phase interphase reactor 136, and the first current balancer. The other end 103b of the first secondary winding 103 of 101A, the other end 105b of the second secondary winding 105 of the second current balancer 101B, and the second negative terminal 52B of the second full-wave rectifier circuit 5B Are connected in series. The neutral point Ro and the three-phase bridge negative terminal 88 of the three-phase bridge rectifier circuit 7 are connected, and one end 8a of the DC reactor 8 and the three-phase bridge positive terminal 87 of the three-phase bridge rectifier circuit 7 are connected. .

  One end 133 a of the first secondary winding 133 of the three-phase interphase reactor 136 is connected to the first bridge AC connection terminal 89 a of the three-phase bridge rectifier circuit 7. One end 135 a of the second secondary winding 135 of the three-phase interphase reactor 136 is connected to the second bridge AC connection terminal 89 b of the three-phase bridge rectifier circuit 7. One end 139 a of the fifth secondary winding 139 of the three-phase interphase reactor 136 is connected to the third bridge AC connection terminal 89 c of the three-phase bridge rectifier circuit 7.

  The rectifying device 120 of the present embodiment and the rectifying device 100 of the above-described embodiment shown in FIG. 16 differ only in the connection of the reactor 126 between the three phases, and the DC voltage ripple and the waveform distortion rate of the AC input current are This is almost the same as the rectifier 100 of the above-described embodiment.

The operation of the rectifier 120 will be described below. If the number of turns of the primary winding and the secondary winding of the three-phase interphase reactor 126 is the same, the total magnetic flux change inside the iron core is zero (0), so the primary output of the three-phase interphase reactor 126 Three-phase full-wave rectification of the neutral point Ro of the first to sixth primary windings 131, 132, 134, 145, 137, and 138 connected in a staggered manner with the three-phase reactor 126 having the side voltage Vdx The voltages for the negative electrodes of the circuits 5A to 5B are voltages applied to the one ends 131a, 134a, and 137a of the first, third, and fifth primary windings 131, 134, and 137, that is, the three-phase full-wave rectifier circuits 5A. It becomes an average value of the output voltage of ˜5C and is expressed by the following equation (58). In Expression (58), the DC output voltage of the first three-phase full-wave rectifier circuit 5A is Vd1, the DC output voltage of the second three-phase full-wave rectifier circuit 5B is Vd2, and the third three-phase full-wave rectifier The DC output voltage of the circuit 5C is Vd3.
Vdx = (Vd1 + Vd2 + Vd3) / 3 (58)

The voltages applied to the first, third, and fifth primary windings 131, 134, and 137 of the three-phase interphase reactor 126 are expressed by equations (59) to (61), respectively. Here, the voltage applied to the first primary winding 131 is V3xa, the voltage applied to the third primary winding 134 is V3ya, and the voltage applied to the fifth primary winding 137. Is V3za.
V3xa = {Vd1 * (2-Kg) -Vd2 * (1 + Kg) -Vd3
× (1-2 × Kg)} / {3 × (1-Kg + Kg ² )} … (59)
V3ya = {− Vd1 × (1-2 × Kg) + Vd2 × (2-Kg) −Vd3
× (1 + Kg)} / {3 × (1-Kg + Kg ² )} ... (60)
V3za = {− Vd1 × (1 + Kg) −Vd2 × (1-2 × Kg) + Vd3
× (2-Kg)} / {3 × (1-Kg + Kg ² )} … (61)

The voltages applied to the second, fourth, and sixth primary windings 132, 135, and 138 of the three-phase interphase reactor 126 are expressed by equations (62) to (64), respectively. Here, the voltage applied to the second primary winding 132 is V3xb, the voltage applied to the fourth primary winding 135 is V3yb, and the voltage applied to the fifth primary winding 138. Is V3zb.
V3xb = Kg × V3xa (62)
V3yb = Kg × V3ya (63)
V3zb = Kg × V3za (64)

The voltages applied to the first to third secondary windings 133, 136, 139 of the three-phase interphase reactor 126 are expressed by Expressions (65) to (67), respectively. Here, the voltage applied to the first secondary winding 133 is Vxn, the voltage applied to the second secondary winding 136 is Vyn, and the voltage applied to the third secondary winding 139. Is Vzn.
Vxn = V3xc = Kh × V3xa (65)
Vyn = V3yc = Kh × V3ya (66)
Vzn = V3zc = Kh × V3za (67)

  Here, when Kg = 1 and Kh = 0.33 are selected, the voltage of the secondary winding is similar to the waveform shown in FIG. 18 in the rectifier 100 of the above-described embodiment.

  FIG. 24 is a chart showing waveforms of the secondary side voltage of full-phase reactor 126 and its full-wave rectified voltage. The voltage between the first bridge AC connection terminal 89a and the neutral point Rn of the Y connection by each secondary winding of the three-phase interphase reactor 126 is Vxn, and the second bridge AC connection terminal 89b and the three-phase interphase reactor 126, the voltage between the neutral point Rn of the Y connection by each secondary winding is Vyn, and the neutrality of the Y connection by each secondary winding of the third bridge AC connection terminal 89c and the three-phase reactor 126 is set to Vyn. The voltage between the point Rn is Vzn. The output voltage of the three-phase bridge rectifier circuit 7 is Vm. In the chart of FIG. 24, the vertical axis represents values obtained by dividing each voltage by the voltage Vab between the first power supply terminal Da and the second power supply terminal Db, which are output terminals of the three-phase AC power supply 2, and the horizontal axis represents the electrical angle ωt. Represents. The unit of electrical angle is degree (°).

  FIG. 25 is a chart showing the waveform of the secondary current of the three-phase interphase reactor 126. The current flowing through the first bridge AC connection terminal 89a of the three-phase bridge rectifier circuit 7 is Ix, the current flowing through the second bridge AC connection terminal 89b is Iy, and the current flowing through the third bridge AC connection terminal 89c is Iz. In the chart of FIG. 20, the vertical axis represents a value obtained by dividing each current by the load current id, and the horizontal axis represents the electrical angle ωt. The unit of electrical angle is degree (°). In the chart of FIG. 20, the waveform of Ix is indicated by a dotted line, the waveform of Iy is indicated by a solid line, and the waveform of Iz is indicated by a two-dot chain line. However, a current flowing from the three-phase reactor 126 to the three-phase bridge rectifier circuit 7 is represented as a positive direction, and a current flowing from the three-phase bridge rectifier circuit 7 to the three-phase reactor 126 is represented as a negative direction. The waveforms of Ix, Iy and Iz are represented by a periodic function with a period of 60 ° having a phase difference of 20 ° with respect to each other.

  In such a rectifier 120, the same effects as those of the rectifiers 1 and 100 of the above-described embodiment shown in FIGS. 1 and 15 can be obtained. 54 pulse rectification can also be realized by the rectifier 120 of the present embodiment, and the waveform of the AC input current to the rectifier 120 is the same as the waveform shown in FIG. The waveform distortion rate of the AC input current of the rectifier 120 is substantially the same as that of the rectifier 1 shown in FIG.

  Table 5 shows the capacities of the transformers of the rectifier 120, that is, the phase-shifting transformer 4, the three-phase reactor 136, and the first and second current balancers 101A and 101B in a ratio to the total output capacity.

  As shown in Table 5, in the rectifier 120 of the present embodiment, rectification can be performed with a capacity of 23.8 percent (%) of the insulating transformer as compared with the case where the insulating transformer is used. it can. Therefore, the size and weight of each transformer can be reduced, and the rectifier can be miniaturized.

  In still another embodiment of the present invention, the DC reactor 8 and the DC load 3 are staggered by the primary winding of the three-phase bridge negative terminal 88 of the three-phase bridge rectifier circuit 7 and the three-phase correlation reactor 126. A neutral point Ro may be connected in series.

  In still another embodiment of the present invention, one end 131a of the first primary winding 131 is connected to one end 103b of the first current balancer secondary winding 103, and the third primary winding 134 is connected. One end 134a of the second primary phase 137a is connected to the second negative terminal 52B of the second three-phase full-wave rectifier circuit 5A, and one end 137a of the fifth primary winding 137 is connected to the second current balancer secondary winding 105. Connected to one end 105b, the neutral point Ro is connected to the positive electrode of the DC output of the three-phase bridge rectifier circuit 7, and connected to one end 102b of the first current balancer primary winding 102 and the second three-phase The second positive terminal 51B of the full-wave rectifier circuit 5A and the one end 104b of the second current balancer primary winding 104 may be connected to the negative terminal of the DC output of the three-phase bridge rectifier circuit 7. In this case, the DC load 3 is connected between the positive pole of the DC output of the three-phase bridge rectifier circuit 7 and the neutral point Ro, or the negative pole of the DC output of the three-phase bridge rectifier circuit 7, and the first current balancer primary winding. A DC reactor is connected between one end 102b of the line 102, the second positive terminal 51B of the second three-phase full-wave rectifier circuit 5A, and a connection portion to which one end 104b of the second current balancer primary winding 104 is connected. 8 are connected in series. Even if it is such a structure, the same effect can be achieved.

  In still another embodiment of the present invention, in the three-phase correlation reactor 126, the other end 131b of the first primary winding 131 and the other end 138b of the sixth primary winding 138 are connected to each other. The other end 134b of the third primary winding 134 and the other end 132b of the second primary winding 132 are connected to each other, and the other end 137b of the fifth primary winding 137 and the fourth 1 The other end 135b of the next winding 135 is connected to each other, and the other ends 132b, 135b, 138b of the second, fourth, and sixth primary windings 132, 135, 138 are connected to each other, and a staggered connection is made. It is good also as a structure to be made. Even if it is such a structure, the same effect can be achieved.

In still another embodiment of the present invention, the number of turns Ng of the first current balancer primary winding 102, the number of turns Nh of the first current balancer secondary winding 103, and the number of turns Ni of the second current balancer primary winding 104 are shown. The number of turns Nj of the second current balancer secondary winding 105 may be different.
In still another embodiment of the present invention, a current balancer having the same configuration as that of the first and second current balancers 101A and 101B is connected to each of the first to third three-phase full-wave rectifier circuits 5A to 5C. The current balancer may be connected to any two of the three three-phase full-wave rectifier circuits. That is, in the present embodiment, a current balancer is connected to the first and third three-phase full-wave rectifier circuits 5A and 5C, but the current balancer is connected to the first and second three-phase full-wave rectifier circuits 5A and 5C. The same effect can be obtained by connecting to 5B or connecting to the second and third three-phase full-wave rectifier circuits 5B and 5C, respectively. In still another embodiment of the present invention, the rectifier 120 may be formed by combining the above-described components.

  FIG. 26 is a circuit diagram showing a configuration of a rectifier 150 according to still another embodiment of the present invention. The rectifying device 150 of the present embodiment includes the same configuration as the rectifying devices 1, 100, and 120 shown in FIGS. 1, 15, and 23 of the above-described embodiment. Reference numerals are assigned and description thereof is omitted. In FIG. 26, the phase shift transformer 4 is shown in a simplified manner.

  The rectifier 150 includes a phase transformer 4, first and second current balancers 151A and 151B, first to third three-phase full-wave rectifier circuits 5A to 5C, a three-phase reactor 126, and a three-phase bridge. A rectifier circuit 7 and a DC reactor 8 are included. The rectifier 150 is the same as the rectifier 120 of the embodiment shown in FIG. 17 described above, except that the first and second current balancers 101A and 101B are removed, and the phase transformer 4 and the first three-phase full-wave rectifier circuit 5A are connected. The first current balancer 151A is connected between them, and the second current balancer 151B is connected between the phase transformer 4 and the third three-phase full-wave rectifier circuit 5C.

  The first current balancer 151A includes first to third windings 152, 153, and 154 that have a polarity in which a magnetic flux generated by a current flowing in one winding cancels out a magnetic flux generated by another winding. Have. The first to third windings 152, 153, and 154 are wound around the same iron core, and are coupled to each other by a magnetic field when a current flows. The windings 152, 153, and 154 of the first current balancer 151A are additive.

  One end 152a of the first winding 152 is connected to one end 25a of the eleventh phase shift transformer secondary winding 25 of the phase shift transformer 4, and the other end 152b of the first three-phase full-wave rectifier circuit 5A. Connected to the first AC connection terminal 53a. One end 153a of the second winding 153 is connected to one end 15a of the third phase shift transformer secondary winding 15 of the phase shift transformer 4, and the other end 153b is connected to the first three-phase full-wave rectifier circuit 5A. It is connected to the second AC connection terminal 53b. One end 154a of the third winding 154 is connected to one end 25a of the seventh phase transformer secondary winding 25 of the phase shift transformer 4, and the other end 154b is the first of the first three-phase full-wave rectifier circuit 5A. 3 Connected to the AC connection terminal 53a. The number of turns of the first to third windings 152, 153, 154 is selected equally.

  The second current balancer 151B includes the fourth to sixth windings 155, 156, and 157 having polarities in which the magnetic flux generated by the current flowing in one winding cancels the magnetic flux generated by the other winding. Have. The fourth to sixth windings 155, 156, and 157 are wound around the same iron core, and are coupled to each other by a magnetic field when a current flows. Each winding of the second current balancer 151B has a positive polarity.

  One end 155a of the fourth winding 155 is connected to the other end 16b of the fourth transfer transformer secondary winding 16 of the phase shift transformer 4, and the other end 155b is connected to the third three-phase full-wave rectifier circuit 5C. It is connected to the 21st AC connection terminal 55a. One end 156a of the fifth winding 156 is connected to the other end 21b of the eighth phase transformer secondary winding 21 of the phase shift transformer 4, and the other end 156b is connected to the third three-phase full-wave rectifier circuit 5C. It is connected to the 22nd AC connection terminal 55b. One end 157a of the sixth winding 157 is connected to the other end 26b of the twelfth phase transformer secondary winding 26 of the phase shift transformer 4, and the other end 157b is connected to the third three-phase full-wave rectifier circuit 5C. It is connected to the 22nd AC connection terminal 55c. The number of turns of the fourth to sixth windings 155, 156, 157 is selected equally. In the present embodiment, the number of turns of the first to sixth windings 152 to 157 is selected equally.

By providing the first current balancer 151A, the magnetic fluxes generated by the current flowing through the first to third windings 152 to 154 cancel each other, and the output current from the positive electrode of the first three-phase full-wave rectifier circuit 5A And the current value of the input current to the negative electrode is made equal. Further, by providing the second current balancer 151B, magnetic fluxes generated by the current flowing through the fourth to sixth windings 155 to 157 cancel each other, and the output from the positive electrode of the third three-phase full-wave rectifier circuit 5C. It works to equalize the current value of the current and the input current to the negative electrode.
The first positive electrode terminal 51A of the first three-phase full-wave rectifier circuit 5A is connected to the first primary winding 131 of the three-phase interphase reactor 126, and the second positive electrode of the second three-phase full-wave rectifier circuit 5B. The terminal 51B is connected to the third primary winding 134 of the three-phase interphase reactor 126, and the third positive terminal 51C of the third three-phase full-wave rectifier circuit 5C is the fifth first of the three-phase interphase reactor 126. Connected to the next winding 137.

  Even with such a configuration, the same effects as those of the rectifiers 1, 100, and 120 shown in FIGS. 1, 15, and 23 described above can be achieved. 54 pulse rectification can also be realized by the rectifier 150 of the present embodiment, and the waveform of the AC input current to the rectifier 150 is the same as the waveform shown in FIG. The waveform distortion rate of the AC input current is substantially the same as that of the rectifier 1 shown in FIG.

  In still another embodiment of the present invention, the first and second current balancers 151A and 151B are provided between the first three-phase full-wave rectifier circuit 5A and the phase transformer 4, and the second three-phase full-wave. It may be connected between the rectifier circuit 5B and the phase transformer 4, respectively, between the second three-phase full-wave rectifier circuit 5B and the phase transformer 4, and the third three-phase full-wave rectifier circuit 5C and the phase. You may connect between between the transformers 4, respectively. In addition, current balancers similar to the first and second current balancers 151A and 151B may be connected between the three-phase full-wave rectifier circuits 5A to 5C and the phase transformer 4, respectively.

  In still another embodiment of the present invention, in the rectifier 150, one end 131a of the first primary winding 131 is connected to the first negative terminal 52A of the first three-phase full-wave rectifier circuit 5A. One end 134a of the third primary winding 134 is connected to the second negative terminal 52B of the second three-phase full-wave rectifier circuit 5A, and one end 137a of the fifth primary winding 137 is The third three-phase full-wave rectifier circuit 5C is connected to the third negative terminal 52C of the third three-phase full-wave rectifier circuit 5C. The neutral point Ro is connected to the positive electrode of the direct-current output of the three-phase bridge rectifier circuit 7. The first to third positive terminals 51A to 51C of the three-phase full-wave rectifier circuits 5A to 5C may be connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit 7. In this case, the DC load 3 is connected between the positive pole of the DC output of the three-phase bridge rectifier circuit 7 and the neutral point Ro, or the negative pole of the DC output of the three-phase bridge rectifier circuit 7, and the first current balancer primary winding. A DC reactor is connected between one end 102b of the line 102, the second positive terminal 51B of the second three-phase full-wave rectifier circuit 5A, and a connection portion to which one end 104b of the second current balancer primary winding 104 is connected. 8 are connected in series. Even if it is such a structure, the same effect can be achieved.

  In still another embodiment of the present invention, in the rectifier 150, the three-phase correlation reactor 126 includes the other end 131b of the first primary winding 131 and the other end 138b of the sixth primary winding 138. Are connected to each other, the other end 134b of the third primary winding 134 and the other end 132b of the second primary winding 132 are connected to each other, and the other end 137b of the fifth primary winding 137 is connected. And the other end 135b of the fourth primary winding 135 are connected to each other, and the other ends 132b, 135b, 138b of the second, fourth, and sixth primary windings 132, 135, 138 are connected to each other. In addition, it may be configured to be staggered. Even if it is such a structure, the same effect can be achieved. In the rectifier 150, the same effect can be achieved even if the three-phase reactor 126 is replaced with the three-phase reactor 106 of the above-described embodiment. In still another embodiment of the present invention, the rectifier 150 may be formed by combining the above-described components.

  In each embodiment of the present invention, each rectifier 1, 100, 120, 150 includes a non-insulated phase transformer 4, but it is necessary to insulate the three-phase AC power source 2 from the DC load 3. Instead of the phase transformer 4, an insulating type phase transformer may be used. Similar effects can be achieved in reducing harmonic distortion.

It is a circuit diagram which shows the electrical constitution of the rectifier 1 of one Embodiment of this invention. FIG. 3 is a diagram schematically showing a configuration of a phase shift transformer 4. FIG. 3 is a diagram schematically showing a configuration of a phase shift transformer 4. It is a circuit diagram which expands and shows the phase shift transformer 4 shown in FIG. It is a circuit diagram which expands and shows the 1st-3rd three-phase full-wave rectifier circuits 5A, 5B, and 5C shown in FIG. It is a circuit diagram which expands and shows the reactor 6A, 6B between the positive electrode side and negative electrode side 3 phase interphase shown in FIG. It is a circuit diagram which expands and shows the three-phase bridge rectifier circuit 7 shown in FIG. It is a table | surface which shows the waveform of the secondary winding voltage of the reactor 6A, 6B between the positive electrode side and negative electrode side 3 phase interphase. It is a table | surface which shows the waveform of the primary winding voltage of the reactor 6A, 6B between the positive electrode side and negative electrode side 3 phase interphase. 4 is a chart showing a waveform of an input voltage of a three-phase bridge rectifier circuit 7; It is a table | surface which shows the waveform of the secondary side winding current of a reactor between 3 phase phases. It is a graph which shows the waveform of the direct-current output current of the 1st-3rd three-phase full-wave rectifier circuit 5A, 5B, 5C. It is a graph which shows the waveform of the electric current supplied to the 4th-6th alternating current input terminal 54a, 54b, 54c of the 2nd 3 phase full wave rectifier circuit 5B. FIG. 3 is a diagram illustrating waveforms of currents Ia, Ib, and Ic supplied from the first to third power supply terminals Da, Db, and Dc of the three-phase AC power supply 2 to the rectifier 1. It is a circuit diagram which shows the structure of the rectifier 100 of one Embodiment of this invention. 6 is a chart showing waveforms of output voltages Vd1, Vd2, and Vd3 of first to third three-phase full-wave rectifier circuits 5A, 5B, and 5C and a voltage Vdx on a primary output side of a three-phase reactor 106. It is a graph which shows the waveform of the voltage applied to each primary winding 1 of the reactor between three phase phases 106. FIG. It is a graph which shows the waveform of the secondary side voltage of the reactor between three phase phases 106, and its full wave rectification voltage. A chart showing the waveform of Vm, the voltage Vd of the positive electrode of the three-phase bridge rectifier circuit 7, the voltage Vdx applied to the three-phase bridge negative terminal 88 of the three-phase bridge rectifier circuit 7, and the output voltage of the three-phase bridge rectifier circuit 7. It is. It is a graph which shows the waveform of the secondary current of the reactor 20 between three phases.

It is a figure which shows the waveform of the direct current output from the 1st-3rd three-phase full-wave rectifier circuits 5A-5C. FIG. 3 is a diagram illustrating waveforms of currents Ia, Ib, and Ic supplied from the first to third power supply terminals Da, Db, and Dc of the three-phase AC power supply 2 to the rectifier 100. It is a circuit diagram which shows the structure of the rectifier 120 of one Embodiment of this invention. It is a graph which shows the waveform of the secondary side voltage of the reactor 126 between three phases, and its full wave rectification voltage. It is a graph which shows the waveform of the secondary current of the reactor between three phase phases 126. FIG. It is a circuit diagram which shows the structure of the rectifier 150 of further another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100,120,150 Rectifier 4 Phase-shifting transformer 5 Three-phase full-wave rectifier circuit 6,106,136 Three-phase reactor 7 Three-phase bridge rectifier circuit 8 DC reactor 9 Filter capacitor 101,151 Current balancer

Claims (5)

Based on the three-phase AC voltage so that three sets of three-phase AC voltages having a phase difference of 20 ° are obtained from the three-phase AC voltage connected to the three-phase AC power source and supplied from the three-phase AC power source. A phase-shifting transformer that generates at least two sets of three-phase AC voltages;
Three three-phase full-wave rectifier circuits each full-wave rectifying three sets of three-phase AC voltages each having a phase difference of 20 ° including the three-phase AC voltage generated by the phase-shifting transformer;
Three three-phase full-wave rectifier circuits for full-wave rectifying each of the three sets of three-phase AC voltages generated by the phase-shifting transformer;
Two primary windings and secondary windings have first to third winding portions wound respectively, and each primary winding wound by the first to third winding portions is staggered. A positive-phase three-phase reactor in which the positive poles of the DC outputs of the three three-phase full-wave rectifier circuits are connected to each other at the neutral point of the staggered connection via primary windings that are staggered;
Each of the primary windings wound around the fourth to sixth winding portions has a staggered connection, and has four to sixth winding portions around which the two primary windings and the secondary winding are wound. And three-phase full-wave rectifier DC output negative electrodes are connected to each other at the neutral point of the zigzag connection via the primary winding connected to the zigzag connection, respectively.
It has three AC connection terminals connected to the secondary winding of the positive-phase and negative-phase three-phase reactors, and the negative pole of the DC output at the neutral point of the staggered connection by the primary winding of the positive-phase three-phase reactors A three-phase bridge rectifier circuit in which the positive electrode of the direct current output is connected to the neutral point of the staggered connection by the primary winding of the negative-phase side three-phase reactor,
Including a DC reactor,
The secondary windings of the first and fourth winding sections are connected in series, the secondary windings of the second and fifth winding sections are connected in series, and the secondary windings of the third and sixth winding sections Lines are connected in series, one end of the three series-connected secondary winding sets are connected to each other, and the other end of the three series-connected secondary winding sets is Connected to the three AC connection terminals of the three-phase bridge rectifier circuit,
Between the neutral point of the staggered connection by the primary winding of the three-phase reactor on the positive side and the negative pole of the DC output of the three-phase bridge rectifier circuit, or in the staggered connection by the primary winding of the three-phase reactor on the negative side A rectifier characterized in that a direct current reactor and a direct current load connected in series to the direct current reactor are connected between the sex point and the negative electrode of the direct current output of the three-phase bridge rectifier circuit. Based on the three-phase AC voltage so that three sets of three-phase AC voltages having a phase difference of 20 ° are obtained from the three-phase AC voltage connected to the three-phase AC power source and supplied from the three-phase AC power source. A phase-shifting transformer that generates at least two sets of three-phase AC voltages;
First to third three-phase full-wave rectifier circuits that full-wave rectify three sets of three-phase AC voltages each having a phase difference of 20 ° including the three-phase AC voltage generated by the phase-shifting transformer;
A first winding connected to the first three-phase full-wave rectifier circuit, one end of which is connected to the positive electrode of the DC output of the first three-phase full-wave rectifier circuit, and the first three-phase full-wave rectifier circuit; A first current balancer having a second winding, one end of which is connected to the negative electrode of the DC output and having a polarity in which the magnetic flux generated by the flow of current cancels the magnetic flux generated by the first winding;
A third winding connected to the second three-phase full-wave rectifier circuit, one end of which is connected to the positive electrode of the DC output of the second three-phase full-wave rectifier circuit, and a second three-phase full-wave rectifier circuit; A second current balancer having a fourth winding having one end connected to the negative electrode of the DC output and having a polarity in which the magnetic flux generated by the flow of current cancels the magnetic flux generated by the third winding;
There are first to third winding portions around which the primary winding and the secondary winding are wound, and each of the primary winding and the secondary winding of each winding portion has two windings. A three-phase reactor that is composed of wires and is staggered, and the other is Y-connected,
A three-phase bridge rectifier having three AC connection terminals connected to each other at a neutral point of a staggered connection or a Y connection by a secondary winding of a three-phase interphase reactor;
Including a DC reactor connected in series with the DC load,
The other ends of the first and third windings and the positive electrode of the DC output of the third three-phase full-wave rectifier circuit are the primary windings that are farthest from the neutral point of the primary winding of the three-phase reactor. Are connected to each other at the neutral point, the neutral point is connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit, the other ends of the second and fourth windings and the second The three-phase full-wave rectifier circuit DC output negative electrode is connected to each other and connected to the three-phase bridge rectifier circuit DC output positive electrode, and the neutral point and the three-phase bridge rectifier circuit DC output negative electrode Or a connection portion where the other ends of the second and fourth windings and the negative electrode of the DC output of the third three-phase full-wave rectifier circuit and the positive electrode of the DC output of the three-phase bridge rectifier circuit are connected to each other. DC reactor and DC load connected in series with this DC reactor Connected thereto,
Alternatively, the other ends of the first and third windings and the positive electrode of the direct current output of the third three-phase full-wave rectifier circuit are connected to each other and connected to the negative electrode of the direct current output of the three-phase bridge rectifier circuit, The other end of the fourth winding and the negative pole of the DC output of the third three-phase full-wave rectifier circuit are connected to one end of the primary winding that is farthest from the neutral point of the secondary winding of the three-phase reactor. The neutral point is connected to each other at the neutral point, and the neutral point is connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit. The neutral point and the positive electrode of the DC output of the three-phase bridge rectifier circuit Or the other end of the first and third windings and the positive electrode of the direct current output of the third three-phase full-wave rectifier circuit and the positive electrode of the direct current output of the three-phase bridge rectifier circuit A rectifier characterized in that a DC load is connected between the two. The first to third winding portions of the three-phase interphase reactor each have one primary winding and two secondary windings,
One secondary winding of the first winding part and one secondary winding of the second winding part are connected in series, and the other secondary winding and third winding part of the second winding part Is connected in series, one secondary winding of the third winding part and the other secondary winding of the first winding part are connected in series, and three series One end of a set of secondary windings connected to each other is connected to each other and staggered,
The other ends of the first and third windings and the positive electrode of the DC output of the third three-phase full-wave rectifier circuit are the primary windings that are farthest from the neutral point of the primary winding of the three-phase reactor. Are connected to each other at the neutral point, the neutral point is connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit, the other ends of the second and fourth windings and the second The three-phase full-wave rectifier circuit DC output negative electrode is connected to the positive electrode of the three-phase bridge rectifier circuit DC output, the other end of the second and fourth windings and the third three-phase A direct current reactor and a direct current load connected in series with this direct current reactor are connected between the connection part where the negative electrode of the direct current output of the full wave rectifier circuit and the positive electrode of the direct current output of the three-phase bridge rectifier circuit are connected to each other. The rectifier according to claim 2, wherein The first to third winding portions of the three-phase interphase reactor each have two primary windings and one secondary winding,
One primary winding of the first winding part and one primary winding of the second winding part are connected in series, and the other primary winding and the third winding part of the second winding part Is connected in series, one primary winding of the third winding part and the other primary winding of the first winding part are connected in series, and three series windings are connected. One end of a set of secondary windings connected to each other is connected to each other and staggered,
The other ends of the first and third windings and the positive electrode of the DC output of the third three-phase full-wave rectifier circuit are the primary windings that are farthest from the neutral point of the primary winding of the three-phase reactor. Are connected to each other at the neutral point, the neutral point is connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit, the other ends of the second and fourth windings and the second The three-phase full-wave rectifier circuit DC output negative electrode is connected to the positive electrode of the three-phase bridge rectifier circuit DC output, the other end of the second and fourth windings and the third three-phase A direct current reactor and a direct current load connected in series with this direct current reactor are connected between the connection part where the negative electrode of the direct current output of the full wave rectifier circuit and the positive electrode of the direct current output of the three-phase bridge rectifier circuit are connected to each other. The rectifier according to claim 2, wherein Based on the three-phase AC voltage so that three sets of three-phase AC voltages having a phase difference of 20 ° are obtained from the three-phase AC voltage connected to the three-phase AC power source and supplied from the three-phase AC power source. A phase-shifting transformer that generates at least two sets of three-phase AC voltages;
First to third three-phase AC voltages having three AC connection terminals, including three-phase AC voltages generated by a phase-shifting transformer, and full-wave rectifying three sets of three-phase AC voltages each having a phase difference of 20 ° A three-phase full-wave rectifier circuit,
On the input side of the first three-phase full-wave rectifier circuit, the magnetic flux that is connected to each of the three AC connection terminals and that is generated when a current flows in one winding cancels the magnetic flux that is generated by the other windings. A first current balancer having first to third windings of matching polarity;
On the input side of the second three-phase full-wave rectifier circuit, the magnetic flux that is connected to each of the three AC connection terminals and that is generated when a current flows in one winding cancels out the magnetic flux that is generated by the other windings. A second current balancer having first to third windings of matching polarity;
There are first to third winding portions around which the primary winding and the secondary winding are wound, and either one of the primary winding or the secondary winding of each winding portion has two windings. A three-phase reactor that is composed of wires and is staggered, and the other is Y-connected,
A three-phase bridge rectifier having three AC connection terminals connected to each other via the secondary windings of the first to third winding portions of the three-phase reactor,
Including a DC reactor connected in series with the DC load,
The positive poles of the DC outputs of the first to third three-phase full-wave rectifier circuits are connected to each other via the primary windings of the reactors between the three-phase phases, and the neutral point of the connection by each primary winding is Connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit, the negative electrode of the DC output of the first to third three-phase full-wave rectifier circuits is connected to the positive electrode of the DC output of the three-phase bridge rectifier circuit, A DC load is connected between the sex point and the negative electrode of the DC output of the three-phase bridge rectifier circuit, or between the negative electrode output terminal and the positive electrode of the DC output of the three-phase bridge rectifier circuit.
Alternatively, the positive electrode of the DC output of the first to third three-phase full-wave rectifier circuits is connected to the negative electrode of the DC output of the three-phase bridge rectifier circuit, and the DC output of the first to third three-phase full-wave rectifier circuits The negative electrodes are connected to each other through the primary windings of the reactors between the three-phase phases, and the neutral point of the connection by each primary winding is connected to the positive electrode of the DC output of the three-phase bridge rectifier circuit. Rectification characterized in that a DC load is connected between the sex point and the positive electrode of the DC output of the three-phase bridge rectifier circuit, or between the positive electrode output terminal and the positive electrode of the DC output of the three-phase bridge rectifier circuit. apparatus.

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