JP3149363B2 - Water-cooled transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-cooled transformer having a high cooling efficiency and being miniaturized.

[0002]

2. Description of the Related Art In recent years, in order to reduce the size and weight of a welding machine, a charger, an uninterruptible power supply, a motor control device, a silicon pulling power supply, a plating power supply, and the like, an inverter circuit is provided in the power supply section. Many have adopted. FIG. 3 shows an example of a circuit diagram of a power supply unit using this inverter circuit.

In FIG. 1, reference numeral 1 denotes an input terminal for inputting an AC power supply. An AC power supply, for example, a commercial AC voltage of 50 or 60 Hz input to this input terminal is rectified by a bridge rectifier circuit 2 composed of a diode, and further a capacitor. After being converted into a DC voltage by the smoothing circuit 3, the DC voltage is input to the inverter circuit 4.

The inverter circuit 4 includes a switching element 4
a, a series circuit of 4b, a series circuit of switching elements 4c, 4d, and switching elements 4a, 4b, 4c, 4d
Free-wheeling diode 4e connected in anti-parallel to
4f, 4g, and 4h, and changes the input DC voltage to a high-frequency voltage of, for example, 20 to 50 kHz. The switching elements 4a, 4
b, 4c and 4d are formed of, for example, IGBTs, MOSFETs, bipolar transistors and the like, and their switching operations are controlled by a control circuit (not shown).

The output of the inverter 4 is insulated by a high-frequency transformer 5 and is transformed to a voltage level required for a load. The output diodes 6a, 6
b, 6c, 6d, 6e, 6f, rectified by an output rectifier circuit 6 and further smoothed by a reactor 7,
That is, the voltage is again converted to a DC voltage and supplied to the load 8.

Incidentally, when the capacity of the load 8 is large, forced air cooling or water cooling has been adopted for cooling the transformer.

[0007]

When the transformer is forcibly air-cooled, it is suitable for a relatively small power supply device.
If the capacity is large, the transformer is water cooled. However, in the case of water cooling, there is a problem that when pure water flows through the windings, the windings become large and the water cooling system becomes large.

An object of the present invention is to provide a water-cooled transformer having a high cooling efficiency and a reduced size.

[0009]

According to the present invention, there is provided a water-cooled conductor having a hollow through which cooling water flows, and mainly connected to the water-cooled conductor directly or by a plate-shaped conductor having good heat conductivity. Heat transfer to the windings that are
Having windings that are connected and cooled by a bar with good conductivity, and the windings that are mainly cooled,
The winding to be cooled and the winding together form a pair with one turn.
It is a thing.

[0010] Of the windings constituting the transformer, the winding mainly cooled is connected to the water-cooled conductor, and the entire winding mainly cooled is cooled from the part of the winding connected to the water-cooled conductor. Cooled. Furthermore, the subordinately cooled windings are thermally connected to the mainly cooled windings, and the heat generated from the subordinately cooled windings turns the mainly cooled windings down. Heat is radiated from the water-cooled conductor through the coil, and the windings that are cooled accordingly are cooled. In addition, cooling mainly depends on the winding to be cooled
Both windings have one turn, and both windings are efficient.
The wire is cooled.

[0011]

[0012]

According to a second aspect of the present invention, there are provided a plurality of water-cooled conductors, each having a hollow through which cooling water flows and electrically connected to a cooling water system by an electrically insulated pipe; Plate conductors with direct or good thermal conductivity
Windings that are connected and cooled mainly, and windings that are connected to and cooled by the bar with good thermal conductivity to the mainly cooled windings and that are cooled by cooling. Good heat conductivity between the connected and subordinately cooled windings
They are connected by bars .

A main cooling coil and a subordinately cooled winding connected to the main cooling winding are connected to a water-cooled conductor divided by an electrically insulated pipe. Therefore, it is possible to cope with a high input voltage by increasing the number of divided water-cooled conductors.

According to a third aspect of the present invention, there are provided a plurality of primary-side water-cooled conductors having a hollow inside through which cooling water flows and electrically connected to a cooling water system by electrically insulated pipes. Good direct or thermal conductivity for each primary water-cooled conductor
The primary winding which is connected and cooled mainly by a plate-shaped conductor and the primary cooling which is mainly cooled and whose one end is connected to the adjacent primary-side water-cooled conductor have good heat conductivity. By the bar
And the other end has good thermal conductivity
A primary winding connected by a bar and subordinately cooled, a secondary-side water-cooled conductor having a hollow through which water-cooled water flows, and a plate-shaped conductor having good heat conductivity directly or directly to the secondary-side water-cooled conductor
A plurality of secondary windings connected mainly cooled by, good thermal conductivity to a plurality of secondary windings are cooled in the main end
And a secondary winding connected and cooled by the bar .

A primary winding to be mainly cooled and a primary winding to be cooled dependently are connected to the primary water-cooled conductor divided by an electrically insulated pipe. Further, a secondary winding that is mainly cooled and a secondary winding that is cooled dependently are connected to the secondary water-cooled conductor, so that both the primary winding and the secondary winding are efficiently cooled. You. By connecting a diode to the secondary cooling which is cooled in accordance with this, it becomes possible to use the secondary winding for various power supplies.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a power semiconductor module according to the present invention will be described with reference to FIGS. Reference numeral 5 denotes a transformer, which is composed of primary windings 11, 12, 13, 14, 15, and 15 made of, for example, a copper plate conductor having good heat conductivity.
16, 17, 18, 19, 20, 21 and 22, and secondary windings 31 and 3 of a plate conductor having good thermal conductivity, for example, made of copper.
2,33,34,35,36,37,38,39,4
0, 41, and 42 are provided. In the figure, the marks indicate the start of winding, and the primary windings 11, 13, 15, 1
The winding ends of 7, 19 and 21 are respectively the primary winding 1
2,14,16,18,20,22 are connected to the beginning of the winding by a bar with good thermal tradition, for example copper. Also, the secondary windings 31, 33, 35, 37, 3
Ends of windings 9 and 41 are secondary windings 32 and 3 respectively.
4, 36, 38, 40, and 42 are connected to each other by a bar having good heat conductivity, for example, copper.

Reference numerals 51, 52, and 53 denote primary-side water-cooled conductors having hollows through which cooling water such as pure water flows.
The end of the winding of the primary winding 12 and the beginning of the winding of the primary winding 13 are connected directly or by a bar made of, for example, copper having good heat conductivity. The winding end of the primary winding 16 and the winding start of the primary winding 17 are connected to the water-cooled conductor 52 directly or by a bar made of, for example, copper having good heat conductivity. Further, the winding end of the primary winding 20 and the winding start of the primary winding 21 are connected to the water-cooled conductor 53 directly or by a bar made of, for example, copper having good heat conductivity. Also, the primary windings 14 and 1
At the end of winding 8, the winding of the primary windings 15 and 19 is connected directly or by a bar made of, for example, copper having good heat conductivity. Numerals 54, 55, 56 and 57 are pipes which connect the water system for cooling with the outside and the water-cooled conductors 51, 52 and 53 and are electrically insulated. The primary winding 1
The winding start of 1 and the winding end of the primary winding 22 are connected to the output of the inverter 4. 23, 24, 25, 26, 2
7, 28 are primary windings 11 and 12, 13 and 1 respectively.
4, 15 and 16, 17 and 18, 19 and 20, 21 and 22
For example, an insulating material such as Nomex provided for insulation between them.

Reference numeral 61 denotes a secondary-side water-cooled conductor having a hollow inside through which cooling water such as pure water flows. The water-cooled conductor 61 has winding ends of the secondary windings 32, 36, and 40 and a secondary winding 33. ,
The winding start of 37 and 41 is connected directly or by a bar made of, for example, copper having good heat conductivity. 62 and 63 are pipes connected to an external cooling water system. The secondary winding 31
Start of secondary winding 34, end of secondary winding 34, secondary winding 35
Start of secondary winding 38, end of secondary winding 38, secondary winding 39
Of the output diodes 6a, 6b, 6c, 6d, 6e, and 6f are connected to the start and end of the secondary winding 42, respectively.
The cathodes of c, 6d, 6e, 6f are connected to a common bar. 43, 44, 45, 46, 47, 48
Are the secondary windings 31 and 32, 33 and 34, 35 and 3 respectively.
6, 37 and 38, 39 and 40, and 41 and 42 are insulating materials such as Nomex.

Now, when the inverter 4 operates and the output of the inverter flows through the transformer 5, the output rectifier circuit 6, and the load 8 through the reactor 7, the transformer 5 generates heat. Since the primary winding of the transformer 5, for example, the winding end of the primary winding 12 is connected to the water-cooled conductor 51, the primary winding 12 is cooled by cooling pure water flowing through the water-cooled conductor 51.

On the other hand, since the primary winding 11 is connected to the primary winding 12 directly or by means of a bar having good thermal tradition,
The heat of the secondary winding 11 is cooled by pure water for water cooling flowing through the water-cooled conductor 51 via the adjacent primary winding 12.

Similarly, the primary winding 13 is connected to the water-cooled conductor 51, and the primary windings 16 and 17 are connected to the water-cooled conductor 52.
Is cooled by cooling pure water flowing through the water-cooled conductor 53. Further, the primary winding 14 is cooled by pure water for cooling flowing through the water-cooled conductor 51 via the primary winding 13, and the primary windings 15 and 18 are cooled via the primary windings 16 and 17, respectively. The primary windings 19 and 22 are cooled by pure cooling water flowing through the water-cooled conductor 53 via the primary windings 20 and 21, respectively.

The secondary windings 32, 33, 36, 37,
Since 40 and 41 are connected to the water-cooled conductor 61 directly or by a bar having a good thermal tradition, they are cooled by pure water for cooling flowing through the water-cooled conductor 61. Further, the secondary winding 31,
The cooling water 34, 35, 38, 39, 42 is cooled by pure water for cooling flowing through the water-cooled conductor 61 via the adjacent secondary windings 32, 33, 36, 37, 40, 41, respectively.

In the above embodiment, although the number of turns of the winding is not mentioned, for example, it is preferable that the number of turns is one.
Although depending on the length of the winding, there is no particular problem as long as it is 3 turns or less. Further, in the above embodiment, one winding that is connected to the water-cooled conductor and is cooled and mainly cooled is provided with one winding that is subordinately cooled through the mainly cooled winding.
Although it is a book, two or more windings may be subordinately cooled. Further, in the primary winding, the number of windings connected to the water-cooled conductor may be two, and the number of windings that are cooled by the main cooling winding may be one.

Further, in the above embodiment, the number of windings connected to the water-cooled conductor and mainly cooled is six for both the primary winding and the secondary winding. It is also possible to increase or decrease only one. Further, in the above embodiment, the number of the water cooling conductors on the secondary side is one, but it may be divided by a pipe that is electrically insulated similarly to the water cooling conductor on the primary side.

Further, the above embodiment is applied to a water-cooled transformer used in a power supply unit using an inverter circuit, but can also be applied to a transformer for transforming a commercial power supply.

[0027]

According to the first aspect of the present invention, among the windings constituting the transformer, mainly the winding to be cooled is connected to the water-cooled conductor, and cooled from the part of the winding connected to the water mixing conductor, The whole of the mainly cooled winding having good heat conductivity is efficiently cooled. The heat generated by the windings that are further subordinately cooled is
Emitted from the water-cooled conductor via mainly cooled windings, released from the water-cooled conductor via the subordinately cooled windings,
The subordinately cooled winding is efficiently cooled. Also,
Since the cooling water does not flow through the winding, the size of the winding is reduced, and the size of the power supply device accommodating the water-cooled transformer is reduced. Also the Lord
The winding to be cooled and the winding to be cooled
The number of wires is one turn and both windings are efficiently cooled.

[0028]

According to a second aspect of the present invention, a water-cooled conductor divided by an electrically insulated pipe has a winding mainly cooled and a sub-cooling connected to the mainly cooled winding. Since the winding to be cooled is connected, it is possible to cope with a high input voltage by increasing the number of the divided water-cooled conductors. In addition, since no cooling water flows through the windings, the size of the windings and the cooling system can be reduced, and the power supply device that houses the water-cooled transformer can be downsized.

According to a third aspect of the present invention, the primary-side water-cooled conductor divided by the electrically insulated pipe has a primary winding mainly cooled and a primary winding cooled dependently. The secondary side water-cooled conductor is connected to a secondary winding that is mainly cooled and a secondary winding that is subordinately cooled, so that both the primary winding and the secondary winding are connected. Cooled efficiently.
In addition, since no cooling water flows through the windings, the size of the windings and the cooling system can be reduced, and the power supply device that houses the water-cooled transformer can be downsized.

[Brief description of the drawings]

FIG. 1 is a schematic layout diagram of an embodiment of a water-cooled transformer according to the present invention.

FIG. 2 is a schematic connection diagram of FIG.

FIG. 3 is a schematic connection diagram of a power supply device in which the water-cooled transformer of the present invention is used.

[Explanation of symbols]

5 Water-cooled transformers 6a, 6b, 6c, 6d, 6e, 6f Output diodes 12, 13, 16, 17, 20, 21 (primarily cooled) primary windings 11, 14, 15, 18, 19, 22 Primary windings 32, 33, 36, 37, 40, 41 (mainly cooled) Secondary windings 31, 34, 35, 38, 39, 42 (subordinately cooled) Secondary windings 51, 52, 53, 63 Water-cooled conductors 54, 55, 56, 57, 62, 63 Piping

──────────────────────────────────────────────────続 き Continuing from the front page Examiner Shinji Uematsu (56) References Japanese Utility Model Sho-63-98613 (JP, U) Japanese Utility Model Sho 63-98612 (JP, U) (58) Fields investigated (Int. Cl. ⁷⁾ H01F 27/16 H01F 27/28

Claims (3)

(57) [Claims] 1. A water-cooled conductor having a hollow space through which cooling water flows, and a plate-like member having good heat conductivity directly or directly to said water-cooled conductor .
A winding mainly connected and cooled by a conductor , and a winding cooled by being connected to the mainly cooled winding by a bar having good heat conductivity and being cooled by the main cooling. Roll
The wire and the dependently cooled winding both have one winding.
A water-cooled transformer consisting of a pair of turns . 2. A plurality of water-cooled conductors to which a cooling water system is connected, and a plurality of water-cooled conductors connected directly to each of the plurality of water-cooled conductors, each having a hollow through which cooling water flows and electrically insulated.
The winding mainly cooled by being connected by a plate-shaped conductor with good contact or heat conductivity, and the winding mainly cooled by heat conduction
A water-cooled transformer having a winding connected by a good bar and being subordinately cooled, wherein the subordinately cooled windings connected to adjacent water-cooled conductors are connected by a bar having good heat conductivity vessel. 3. A plurality of primary-side water-cooled conductors, each having a hollow through which cooling water flows and electrically insulated, to which a cooling-water system is connected, and a plurality of primary-side water-cooled conductors. A primary winding, which is connected to each other directly or by a plate conductor having good thermal conductivity and is mainly cooled, and a bar having good thermal conductivity is connected to the primary water-cooled conductor having one end adjacent thereto. Connected to the primary cooled primary winding,
The other end is connected by a bar having good heat conductivity, and is independently cooled by a primary winding; a secondary-side water-cooled conductor having a hollow through which water-cooled water flows; and directly connected to the secondary-side water-cooled conductor.
Alternatively, a plurality of secondary windings mainly connected and cooled by a plate conductor having good heat conductivity , and one end connected to the plurality of secondary windings mainly cooled by a bar having good heat conductivity. Water cooled transformer having a secondary winding that is cooled in a dependent manner.