JPH05316734A - Dc power source - Google Patents

Abstract

PURPOSE:To reduce a voltage drop and an eddy current loss by improving utilization rate of a primary winding provided on a core leg of a two-leg core and reducing a magnetic flux and an inductance generated due to a commutating current. CONSTITUTION:Secondary windings of core legs are formed of divided windings 531, 532, 541, 542. Rectifiers 61, 63 and 62, 64 are so connected that currents flowing to the windings 513, 541 and 532, 542 become reverse to constitute transformer rectifiers independent for the legs so that AC currents flow to primary windings of the respective legs. A combination of terminals in which communicating currents simultaneously flow reversely of terminals u1, x1, y1, v1, u2, x2, y2, v2 are set to one, directly opposed to be extended thereby to reduce magnetic flux and commutating inductance to be generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC power supply device for obtaining a direct current of a low voltage and a large current necessary for aluminum surface treatment, electrolysis, etc., and particularly DC power obtained by rectifying commercial frequency AC power with a rectifier. The present invention relates to a direct-current power supply device for converting direct current into high-frequency alternating current at a kHz level by an inverter using a high-speed switching element such as a power transistor, and rectifying this by a rectifier to obtain direct-current power.

[0002]

2. Description of the Related Art Recent improvements in the performance of power semiconductor devices have made it possible to switch large currents at high frequencies, and active development of inverter switching DC power supply devices aimed at reducing the size and weight of transformers and reactors. Has been done. FIG. 4 is a circuit diagram of a conventional DC power supply device of such a system. In this figure, 50Hz or 60
The three-phase AC power obtained from the three-phase power source 1 having a commercial frequency of Hz is rectified by the rectifier 2 and the smoothing capacitor 3 obtains the DC power in which the pulsating current component included in the output voltage of the rectifier 2 is reduced,
This DC power is converted into a high-frequency single-phase AC of several kHz by the inverter 4, and then it is stepped down to a predetermined low voltage by the rectifier transformer 5A whose primary side is connected in parallel and rectified by the rectifier 6A to obtain DC power. , Which is supplied to the load 9.

Since the inverter 4 controls ON / OFF of four power transistors which are not designated by a control pulse output from a control circuit (not shown) and outputs a high frequency AC alternating positive and negative, this DC power source The device also has the feature that it can control the load DC voltage or current at high speed and with high accuracy. The rectifier transformer 5A includes a two-leg iron core 50 and two iron leg legs 501 and 50.
2 is composed of a primary winding and a secondary winding, each of which has a primary winding 51A and a secondary winding 53 on the first iron core leg 501, and a primary winding on the second iron core leg 502. 52A and a secondary winding 54 are provided, respectively, and each has a depolarization, as can be seen from the polarity indicated by a mark in the figure.

The terminal of the secondary winding 52A is connected to u,
x, and the terminals of the secondary winding 54 are y and v. The anode side of the rectifying element 61A is connected to the terminal u, and the rectifying element 62A is connected to the terminal v.
The anode sides of A are connected to each other, and the cathode sides of these rectifying elements 61A and 62A are connected to a DC lead 81 which is a P pole. Further, the terminals x and y are connected to each other and connected to the DC lead 82 which is an N pole. Since the polarity of each winding is depolarized as shown in the figure, the voltages induced at the terminals u and v have opposite polarities with respect to the DC lead 82, that is, they differ in phase by 180 °. There is. Therefore, the rectifying elements 61A and 62A of the rectifier 6A connected to these terminals u and v are
When the voltage induced in 3, 54 is not zero, only one of them is in the ON state and the load current flowing in the load 9 flows in only one of the secondary windings 53, 54. Halves of the rectifier 6A flow in a shared manner, and as a result, the rectifier 6A outputs a full-wave rectified waveform.

As is well known, the rectifying element 61A and the rectifying element 6
There is a period in which both the rectifying elements 61A and 62A are in the on state and a circulating current flows in the process in which 2A shifts from off to on or from on to off. The commutation period is called the commutation current. ing. As will be described later, this commutation current has a waveform that changes abruptly with time, and the circulation circuit thereof starts from the terminal u and has a rectifying element 61A and a rectifying element 62.
It is a closed circuit that returns to terminal u via A, terminal v, secondary winding 54, terminal y, terminal x, secondary winding 53. Secondary winding 53,
A current also flows in the primary windings 51A and 52A corresponding to the current flowing in 54, and flows in the primary side circuit including the inverter 4.
A voltage drop corresponding to the product of the inductance of the circulation circuit and the primary circuit and the time derivative of the circulation current occurs, the DC voltage as the output voltage of the DC power supply device becomes small, and further, the time changes rapidly. The leakage magnetic flux generated by the circulating current causes stray loss in the connecting leads and the metallic structure in the vicinity due to the electromagnetic induction effect, which causes a decrease in efficiency and a decrease in device life due to local heating. Since the number of turns of the secondary windings 53 and 54 is much smaller than that of the primary windings 51A and 52A, the inductance that affects commutation is actually the leakage inductance of the rectifier transformer 5A and the secondary side circuit. It is a stray inductance, and the inductance of the primary circuit is usually substantially negligible.

FIG. 5 is a two-sided view of a conventional DC power supply device constructed on the basis of the circuit diagram of FIG. 4, FIG. 5 (a) is a front view, and FIG. 5 (b) is a side view. In this figure, the DC leads 81 and 82 are made of rectangular conductors and are arranged in parallel to each other. The upper DC lead 82 in the figure is the N pole, the lower DC lead 81 is the P pole, and the rectifier transformer 5A is It is arranged between two DC leads 81, 82. The rectifiers 61A and 62A of the rectifier 6A have a structure in which a semiconductor element is molded into a shape as shown in the figure and both terminals are drawn out on one surface and connected to a connection lead by tightening bolts. In this figure, rectifying elements 61A and 62A made up of three semiconductor elements, each of which schematically shows the symbol of the rectifying element, are attached. Since the molded resin part is attached, the rectifying element 61 is electrically connected.
A and 62A are insulated from the DC lead 81.
The number of rectifying elements is determined by the relationship between the rated current of the DC power supply device and the current capacity of the rectifying elements used, and is not limited to three.

The connecting lead 731 is drawn out from the upper part of the secondary winding number 53 provided on one iron core leg 501 of the two-leg iron core 50 through the terminal x and connected to the DC lead 82 by bolting, and the terminal u from the lower part. The connecting lead 711 is drawn out through the connection lead 711 and is connected to the anode side of the rectifying element 61A, and the cathode side of the rectifying element 61A is connected to the connecting lead 721.
It is connected to the DC lead 81 via. Iron core leg 50
The configuration of the upper connection lead 732 drawn out from the upper part of the secondary winding 54 provided at 2 via the terminal y, the connection lead 721 via the lower terminal v, and the rectifying element 62A is also the same. As shown in FIG. 5 (a), it is symmetrical.

The path of the above-mentioned commutation current is shown by an arrow in FIG. 5A, but it is a path along the side of a substantially rectangular shape. FIG. 6 is a waveform diagram showing changes over time in the voltage and current of each part shown in FIG. In this figure, the horizontal axis represents time, and two cycles of alternating current generated by the inverter 4 are shown. The uppermost figure shows the primary voltage V of the rectifier transformer 5A.
₁ in a square wave alternating current, there is a period of zero point t ₂ ~t ₃ during the negative period of time t ₁ ~t positive period of ₂ and the time point t ₃ ~t _4, the control signal of the inverter 4 The voltage or current supplied to the load 9 is controlled by changing the width of these periods. The second diagram from the top shows the waveform of the primary current I ₂ , which is a trapezoidal waveform whose value gradually increases during the positive period of the primary voltage V ₁ , and the slopes of the rising and falling portions will be described later. Thus, there is a commutation portion, and there is a period during which no current flows between the positive period and the negative period.

The second diagram from the bottom shows the secondary current I ₂₁ flowing through the secondary winding 53 and the rectifying element 61A. Since the rectifying element 61A only sends a current in the forward direction, a current having a substantially trapezoidal shape is formed every half cycle. Flows. The period of time t ₁ ~t ₂ is substantially the same waveform as the primary current I _1, 1 at the time point t ₂ ~t ₃ value of about 2 minutes
The flow continues. The primary winding 51 is the secondary winding 53
, And the ampere-turn are the same, the current value is the same though there is a difference based on the turns ratio.

The lowermost drawing shows the secondary winding 54 and the rectifying element 62.
A secondary current I ₂₂ flowing in the A, a negative current in the opposite direction flows through the secondary current I ₂₁ shifted by half cycle and the secondary current _21.
Time t ₂ ~t current having the same waveform and magnitude flow in different only _3, the secondary current I ₂₁ and negative. This is because the primary current is zero during this period and the two circuits share the load current evenly.

The commutation from the time point t ₂ is a process in which the current flowing only in the rectifying element 61A is halved into the rectifying elements 61A and 62A because the primary voltage V ₁ becomes zero from the peak value. The commutation from the time point t ₃ occurs in the rectifying element 62A because the primary voltage has changed from zero to a negative peak value.
It occurs in the process of concentrating only on A.

[0012]

As is well known, the
Configuration in which the positive part and the negative part separately flow in two windings
In the case of, both the physique of the winding and the generated loss are the square root of 2.
Double. Furthermore, at time t ₂~ T₃The period when the primary current is zero
But the secondary current I_{twenty one}, I_{twenty two}The current of each half flows
Therefore, if this period is long, the generated loss increases accordingly. this
The same applies to the primary windings 51A and 52A as described above.
is there. Secondary winding 5 to which the rectifying elements 61A and 62A are connected
It is unavoidable with 3, 54, but the primary winding 51A, 52A
However, only positive or negative current flows through each and the primary
Since half the current flows even when the pressure is zero, the primary winding
Large winding size and large loss
There is a problem of becoming harder.

The path through which the circulating current flows at the time of commutation described above in these figures is the path indicated by the arrow in FIG.
Except for the secondary windings 53 and 54, it has a substantially rectangular peripheral shape, and as is well known, the larger the area surrounded by the current path, the larger the inductance and leakage flux of the circuit. However, there is a problem that the inductance of the path through which the circulating current flows during this commutation is also large.
As described above, when the inductance of the circulation circuit is large, the commutation period is long, the voltage drop value of the DC voltage is large, and the leakage magnetic flux is large, so that the surrounding metal structure, especially the transformer 5A for the rectifier shown in the drawing. There is also a problem that eddy currents flow through the iron core legs 501 and 502 and local heating occurs.

The object of the present invention is to solve such a problem, to reduce the generated loss by reducing the winding size of the primary winding, and to reduce the inductance and the generated magnetic flux of the circulating circuit of the commutation current to reduce the DC voltage. Another object of the present invention is to provide a DC power supply device having a secondary side circuit of a transformer for a rectifier, which is capable of reducing the voltage drop of the above and suppressing local heating of surrounding metal structures.

[0015]

In order to solve the above-mentioned problems, according to the present invention, for a rectifier in which a primary winding and a secondary winding are provided in each of two iron core legs of a two-leg iron core. A transformer and a rectifier transformer, which comprises a transformer and a rectifier composed of a rectifying element connected to each of these two secondary windings, and the high frequency alternating current generated by the inverter is input to the primary winding of the rectifier transformer. In the DC power supply device, in which the low-voltage AC, which has been stepped down to a predetermined voltage by the rectifier, is full-wave rectified to obtain DC power, the secondary winding of each of the two iron core legs is divided into two divided secondary windings. It is assumed that an independent transformer rectifier circuit is configured for each iron core leg by connecting rectifying elements so that the directions of the currents flowing in the respective split secondary windings are opposite. U ₁ , x for both terminals of _one split secondary winding of _{1. When} both the terminals of the other split secondary winding are set to y ₁ and v ₁ by matching the order of the phase with this, the terminal u ₁ and the connecting lead connected to the terminal and the terminal v ₁ and the connecting lead are connected. And the connection lead connected to the terminal y ₁ and the connection lead connected to the terminal x ₁ and the connection lead connected to the terminal x ₁ are directly opposed to each other. The terminals of the two split secondary windings of the legs and the connecting leads thereof shall have the same structure as the terminals of the split secondary windings of the iron core and the connecting leads thereof, and the width surfaces are arranged in parallel as a common plane. The transformer for rectifier is arranged such that the plane common to the two iron core legs is orthogonal to the plane of the DC lead composed of the two rectangular conductors, and the divided secondary windings of each of the two iron core legs are arranged. Align the lead-out position of each terminal of the wire with the two-leg iron core in between. And a rectifier transformer in which a common plane is parallel to the two iron core legs with respect to the planes of the two DC leads arranged in parallel with the width plane as a common plane. And the terminals of the respective divided secondary windings of the respective iron core legs are arranged side by side on a plane parallel to the plane common to the iron core legs.

[0016]

In the structure of the present invention, the secondary winding of each of the two iron core legs is divided into two divided secondary windings,
By connecting a rectifying element to each split secondary winding so that the current directions are opposite to each other in one iron core leg, and forming an independent transformer rectification circuit for each iron core leg, Since the current flowing through the primary winding of the leg is an alternating current that flows in both positive and negative directions, the size and loss of the primary winding are reduced as compared with the conventional case where only the current in one direction flows.

Also, one split secondary winding of one iron core leg
Both terminals of u₁, X₁, And the order of the phase with this, etc.
Both terminals of the split secondary winding are y₁, V₁And when the end
Child u ₁And connecting lead and terminal v connected to this₁as well as
Placed directly opposite the connection lead connected to this,
Terminal y₁And the connecting leads and terminals connected to it x₁Toko
Place it directly opposite the connection lead connected to it, and
Terminal of the two split secondary windings of one core leg and its connection
The terminals are also the secondary secondary winding terminals of the iron core legs and their connections.
By using the same structure as the lead, the same waveform can be obtained simultaneously.
The terminals and connection leads where the
The magnets generated by each
A commutation current is generated because the bundles cancel each other out.
The magnetic flux is reduced, and the commutation inductance is also
Get smaller.

Further, the rectifier transformer is arranged such that the plane common to the two iron core legs is orthogonal to the plane common to the above-mentioned DC lead, and the divided secondary winding of each of the two iron core legs is arranged. By arranging the lead-out positions of the wire terminals so as to face each other with the two-leg iron core sandwiched therebetween, the connection lead can be connected between the terminal and the DC lead and between the terminal and the rectifying element without twisting the connection lead. The routing shape of is simple.

Further, a rectifier transformer is arranged with the common plane of the iron core legs parallel to the common plane of the DC lead, and the terminals of the split secondary windings of the respective iron core legs are connected to the iron core legs. By arranging them side by side on a plane parallel to the common plane, it is possible to form the connecting lead without twisting it, as in the case described above.

[0020]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a circuit diagram of a DC power supply device showing an embodiment of the present invention.
Yes, common reference numerals are given to the same components as in FIG.
And omit detailed explanations. In this figure, transformer for rectifier
2 of the two iron core legs 501 and 502 that compose
The secondary winding in which the iron core 501 is divided by dividing the secondary winding into two
The winding is divided into two parts, the secondary windings 531 and 532 and the iron core leg 502.
The secondary windings are divided secondary windings 541 and 542. Split secondary
Both terminals of winding 531 are u₁, X₁, Split secondary winding 532
Both terminals of y₁, V₁And divided secondary windings 541, 54
2 has replaced the subscript of the terminals of the split windings 531 and 532.
I shall. And each of the divided secondary windings 531 and 5
32, 541, 542 are terminals u as indicated by the polarity
₁, Y ₁, U₂, Y₂Have the same phase and the terminal x₁, V
₁, X₂, V₂Terminal u in the same phase₁Is 180 °
The phase is different.

Terminal u₁The anode side of the rectifying element 61 is
Connected to the DC lead 81 whose cathode side is the P pole
Connected, terminal y₁Is connected to the cathode side of the rectifying element 62.
Connected to the DC lead 82 whose anode side is the N pole.
Connected, terminal x₁, Y ₁DC leads 82, 81
Are each directly connected to. Also, the terminal v₂In order
The anode side of the flow element 63 is connected and the cathode side of the current element 63 is directly connected.
Connected to the current lead 81, terminal x₂Of the rectifying element 64
The cathode side is connected and the anode side is the DC lead 82.
Connected to the terminal y₂, U₂Direct DC
It is connected to the leads 82 and 81.

The split windings 531 and 532 and the rectifying element 61,
The combination with 62 constitutes an independent transformer rectification circuit, as is clear from the fact that the combination of the secondary windings 53 and 54 and the rectification elements 61A and 62A in FIG. 4 is the same circuit. Therefore, an alternating current flows through one primary winding 51 common to these as shown in FIG. 3 described later.
Therefore, the rectifier transformer 51A and the rectifier transformer 5
Assuming that the capacity is the same as 1, the primary winding 51 is smaller than the primary winding 51A in both the winding size and the loss, which is 1 / square root of 2. The same applies to the primary winding 52.

FIG. 2 is a front view of the DC power supply device of FIG. In this figure, two iron core legs 50 are shown as shown.
The plane common to 1 and 502 is parallel to the paper surface, and the DC leads 81 and 82 are as shown in the cross-sectional view in the figure.
The iron core legs are arranged so as to be orthogonal to a common plane. Terminals u ₁ , x ₁ , y of the split secondary windings 531 and 532
₁ , v ₁ are split secondary windings 541 and 542 from the left side of the drawing.
The terminals u ₂ , x ₂ , y ₂ and v _{2 of each} of the two are arranged at their respective drawn-out positions from the right side of the figure with the two-leg iron core 50 interposed therebetween.

The terminal and the DC lead or the rectifying element are connected by a connecting lead, and the terminal u ₁ and the rectifying element 61 are connected.
Is a connection lead 811, and the terminal v ₁ and the DC lead 81 are connection leads 812. Similarly, as shown in the drawing, the connection leads 813, 814, 821, 822, 823, 8
24 are used. Terminals u ₁ , x ₁ , y ₁ , v ₁ ,
Since u ₂ , x ₂ , y ₂ , and v ₂ are drawn out with their width surfaces perpendicular to the paper surface, connection leads 811, 812, 813, 814, 821, 822, 8 connected to them.
Since the width surfaces of 23 and 824 are also perpendicular to the paper surface, the DC leads 81 and 82 similarly arranged orthogonal to the paper surface.
When connecting with, it is possible to straightly route these connecting leads without twisting. At the time of commutation, current flows in the opposite directions to the connection leads 811 and 812, so that the generated magnetic fluxes cancel each other out, and both the magnetic flux amount and the inductance become small. The same applies to all connection leads.

FIG. 3 is a waveform diagram showing changes in voltage and current of each part shown in FIG. 1 with time. In this figure, the horizontal axis represents time and the vertical axis represents the size of each waveform, and the primary voltage V _{1 in} the uppermost diagram and the primary current I ₁ in the second diagram are the same as those in FIG. Current I ₁₁ of the second stage from the bottom figure the primary winding 51, the bottom is the current I ₁₂ of the primary winding 52, one half of any size the primary current I _1, the waveform is the same Is becoming That is, in FIG. 6, the current flowing through the primary winding is a positive or negative half-wave like that of the secondary winding, and half the current flows during the period when the primary voltage is zero. In No. 3, alternating current in which positive and negative half waves alternately flow in the two primary windings 51 and 52. As described above, in the case of the primary windings 51A and 52A of FIG. 6, both the winding size and the generated loss are more than the square root of 2 as compared with the case where the alternating current flows, whereas the primary winding of FIG. In the case of the wires 51 and 52, since the winding size and the generated loss are not increased as described above, the winding size can be made smaller than that of the primary winding of the conventional configuration, and the generated loss is also increased. Will be reduced.

As shown in FIG. 2, iron core legs 501, 502
Common plane is parallel to the paper surface, but the DC leads 81,
The plane common to 82 is orthogonal to the paper surface, that is, the iron core leg 50
This is an arrangement orthogonal to the plane common to 1 and 502. Terminal u
_{Since 1} , x ₁ , y ₁ , v ₁ , u ₂ , x ₂ , y ₂ , and v ₂ are arranged so that their width faces are orthogonal to the plane of the drawing, DC leads 81, 82 and rectifying elements 61, 62, 63, 64 are provided. Connection leads 811, 812, 813, 8 for connecting between
14, 821, 822, 823, 824 are also DC leads 8
It will be parallel to 1,82. Therefore, it is possible to provide a simple routing structure without twisting the connection lead at a right angle.

Terminals u ₁ , x ₁ , y ₁ , v ₁ and terminals u ₂ ,
The arrangement of the pull-out position with x ₂ , y ₂ and v ₂ is a two-leg iron core 5.
Since it is provided on both sides with 0 interposed therebetween, the rectifying elements 61,
Similarly, the rectifying elements 62 and 64 may be attached to the width surfaces on both sides of the DC lead 82 with the DC lead 82 interposed therebetween. As is clear from the figure, all the constituent elements are symmetrical left and right, that is, the constituent elements related to the two-leg iron cores 501 and 502 have the same shape and dimension, so that the circulating current flow path during commutation flows. Since the respective inductances are also the same, the voltage drops proportional to this inductance also match, and there is no imbalance in current sharing between the two transformer rectification circuits.

As in FIG. 5, instead of FIG. 2, the plane common to the DC leads 81, 82, the core legs 501, 502.
It is also possible to adopt a configuration in which the common plane and terminals and all the connection leads connected to the terminals are arranged parallel to the paper surface. In this case as well, the terminals and the connecting leads, in which the circulating currents flow in opposite directions to each other, are pulled out as a set, so that the inductance and the amount of generated magnetic flux remain small.

In FIG. 1, the rectifying element 62 of FIG. 2 is connected to the terminal y ₁ instead of the terminal v ₁ and the rectifying element 64 is connected to the terminal x ₂ instead of the terminal u ₂ . , 62, 63, 64 are allocated to the DC leads 81, 82 so that two of them are not overlapped.
Actually, there are various combinations of the terminals for connecting the four rectifying elements and the arrangement of the positions where the terminals are drawn out from the divided secondary winding, and the configuration and the arrangement orthogonal to FIG. 2 and FIG. However, different configurations and arrangements can be adopted within the range not deviating from the object of the present invention.

[0030]

As described above, according to the present invention, the secondary winding of each of the two iron core legs is divided into two divided secondary windings, and the direction of the current flow in one iron leg. By connecting rectifying elements to each split secondary winding so that they are opposite to each other, and forming an independent transformer rectification circuit for each iron core leg, the current flowing through the primary winding of each iron leg can be positive or negative. Since it becomes an alternating current, there is an effect that the size of the primary winding and the generated loss are reduced as compared with the conventional case in which only the current in one direction flows and the cost and efficiency of the DC power supply device can be improved. can get.

Also, one split secondary winding of one iron core leg
Both terminals of u₁, X₁, And the order of the phase with this, etc.
Both terminals of the split secondary winding are y₁, V₁And when the end
Child u ₁And connecting lead and terminal v connected to this₁as well as
Placed directly opposite the connection lead connected to this,
Terminal y₁And the connecting leads and terminals connected to it x₁Toko
Place it directly opposite the connection lead connected to it, and
Terminal of the two split secondary windings of one core leg and its connection
The terminals are also the secondary secondary winding terminals of the iron core legs and their connections.
By using the same structure as the lead, the same waveform can be obtained simultaneously.
The terminals and connection leads where the
The magnets generated by each
A commutation current is generated because the bundles cancel each other out.
Metals such as iron cores due to reduced magnetic flux
Reduces eddy current loss generated in structures
The efficiency is improved and the vortex
Life due to local overheating due to local concentration of current loss
It also has the effect of avoiding the problem of life loss.
It Also, as the magnetic flux decreases, the commutation inductor
Since the impedance also becomes smaller, the voltage due to the DC load current
Since the drop is small, the rectifier transformer and inverter
The cost of being able to reduce the capacity of
You can get a descent that you can expect down.

Also, with respect to the plane common to the DC leads,
Arrange the transformers for rectifiers so that the plane common to the two iron core legs is orthogonal to each other, and the lead-out positions of the split secondary winding terminals of the two iron core legs are opposed to each other with the two-leg iron core sandwiched therebetween. By arranging them, the width surfaces of the DC lead, the terminal, and the connection lead connected to this are all orthogonal to the plane common to the iron core leg described above, so that the terminal, the DC lead, and the terminal can be connected without twisting the connection lead. Since the rectifying elements can be connected to each other, it is possible to obtain the effect of simplifying the lead shape of the connecting lead. In addition, the rectifier transformer is arranged with the common plane of the iron core legs parallel to the common plane of the DC leads described above, and the terminals of the split secondary windings of each iron leg are shared by the iron legs. By arranging them side by side on a plane parallel to the plane, the connection lead can be formed in a lead-out shape without twisting as in the case described above.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a DC power supply device showing an embodiment of the present invention.

FIG. 2 is a front view of the DC power supply device of FIG.

FIG. 3 is a waveform diagram showing changes over time in voltage and current of each part shown in FIG.

FIG. 4 is a circuit diagram of a conventional DC power supply device.

5A is a front view of the DC power supply device of FIG. 4, and FIG.
Is a side view

FIG. 6 is a waveform diagram showing changes in voltage and current of each part shown in FIG. 4 with time.

[Explanation of symbols]

 1 Three-phase AC power supply 2 Rectifier 4 Inverter 5 Rectifier transformer 50 Two-leg iron core 501 Iron core leg 502 Iron core leg 51 Primary winding 52 Primary winding 531 Split secondary winding 532 Split secondary winding 541 Split secondary winding 542 Split secondary winding 6 Rectifier 61 Rectifier element 62 Rectifier element 61 Rectifier element 62 Rectifier element 81 DC lead 82 DC lead 811 Connection lead 812 Connection lead 812 Connection lead 814 Connection lead 821 Connection lead 822 Connection lead 823 Connection lead 824 Connection lead

Claims (4)

[Claims] 1. A rectifier transformer in which a primary winding and a secondary winding are provided on each of two iron core legs of a two-leg iron core, and a rectifying element connected to each of these two secondary windings. And a high-frequency alternating current generated by an inverter is input to the primary winding of the rectifier transformer, and low-voltage alternating current that is stepped down to a predetermined voltage by the rectifier transformer is full-wave rectified by the rectifier. In the direct current power supply device capable of obtaining direct current power, the secondary windings of each of the two iron core legs are composed of two split secondary windings, and the directions of the currents flowing through the split secondary windings are reversed. A DC power supply device characterized in that an independent transformer rectification circuit is configured for each iron core leg by connecting the rectification elements as described above. 2. The terminals of _one split secondary winding of one iron core leg are connected to u ₁ and x ₁ , and the terminals of the other split secondary winding are connected to y ₁ and x ₁ in phase order. ₁ and v ₁ , the terminal u ₁
And the connection lead connected thereto and the terminal v ₁ and the connection lead connected thereto are directly opposed to each other, and the terminal y ₁
And the connection lead connected thereto, the terminal x ₁ and the connection lead connected thereto are directly opposed to each other, and the terminals of the two split secondary windings of the other core leg and the connection lead thereof are also 2. The terminal of the split secondary winding of the iron core leg and the connecting lead thereof have the same structure.
DC power supply described. 3. A direct current lead composed of two flat rectangular conductors arranged in parallel with a width plane as a common plane is set to be 2 with respect to the plane.
A rectifier transformer is arranged so that the plane common to the two iron core legs is orthogonal to each other, and the lead-out positions of the respective terminals of the split secondary windings of the two iron core legs are opposed to each other with the two-leg iron core sandwiched therebetween. The DC power supply device according to claim 1 or 2, wherein the DC power supply device is arranged so as to be arranged. 4. The two are arranged in parallel with the width plane as a common plane.
A rectifier transformer is arranged with the plane common to the two iron core legs parallel to the plane of the DC leads, and the terminals of the split secondary windings of the iron core legs are connected to the iron core. 3. The DC power supply device according to claim 1, wherein the DC power supply device is arranged side by side on a plane parallel to a plane common to the legs.