JP2010278273A - Variable voltage type transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable voltage type transformer allowing the voltage of a secondary winding to be steplessly changed by simplifying the structure without needing another power source. <P>SOLUTION: This variable voltage type transformer includes: an iron core 2 constituting a closed magnetic path; a primary winding 3 and the secondary winding 4 respectively wound around the iron core 2; and magnetic path area adjustment means (8, 9) located between the primary winding 3 and the secondary winding 4 for steplessly adjusting the magnetic path area of the iron core 2. Since a flux content flowing to the secondary winding 4 can be steplessly adjusted by forming the transformer into such a structure, the voltage generated in the secondary winding 4 can be steplessly changed. Accordingly, a control winding for adjusting the flux content, another power source for carrying a current to the control winding and a current adjustment device for adjusting the flow rate of the current from the other power source are not necessary at all. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a variable voltage transformer capable of changing a secondary voltage in accordance with a load, and more particularly to a variable voltage transformer capable of changing a voltage between a commercial power source and a load steplessly. .

  Conventionally, a variable voltage type transformer capable of steplessly changing a voltage between a commercial power source and a load has already been proposed as disclosed in Patent Document 1, for example.

  In the variable voltage transformer disclosed in Patent Document 1, the amount of the main magnetic flux flowing in the iron core of the transformer is adjusted by flowing the control magnetic flux in the reverse direction, thereby adjusting the voltage of the secondary winding. It is what.

JP 2001-44051 A

  According to the variable voltage transformer disclosed in Patent Document 1, since the voltage of the secondary winding can be changed steplessly, there is an advantage that fine voltage adjustment can be performed.

  However, such a variable voltage transformer requires a control winding for generating a control magnetic flux, a separate power source for passing a current through the control winding, and a current adjusting device for adjusting the flow rate of the current. As a result, the number of parts as a variable voltage transformer increases, and there is a problem of increasing the size of the entire transformer.

  An object of the present invention is to provide a variable voltage transformer that does not require a separate power source and can change the voltage of a secondary winding steplessly with a simple configuration.

  In order to achieve the above object, the present invention provides an iron core constituting a closed magnetic circuit, a primary winding and a secondary winding wound around the iron core, and between the primary winding and the secondary winding. Magnetic path area adjusting means for adjusting the magnetic path area of the iron core positioned steplessly is provided.

  In this way, the magnetic path area of the iron core located between the primary winding and the secondary winding is adjusted steplessly by the magnetic path area adjusting means, so that the amount of magnetic flux flowing through the secondary winding is steplessly adjusted. The voltage generated in the secondary winding can be changed steplessly.

  Therefore, there is no need for a control winding for adjusting the amount of magnetic flux, a separate power source for supplying current to the control winding, and a current adjusting device for adjusting the flow rate of current from the separate power source. The configuration as a transformer is almost the same as the configuration of the constant voltage transformer.

  As described above, according to the present invention, it is possible to obtain a variable voltage transformer that can change the voltage of the secondary winding steplessly with a simple configuration without requiring a separate power source.

The partially broken perspective view which shows one Embodiment of the variable voltage type transformer by this invention. The top view of FIG. The perspective view which shows the iron core and coil | winding of the variable voltage type transformer of FIG. FIG. 4 is a plan view of FIG. 3. The conceptual diagram of FIG. FIG. 6 is an equivalent circuit diagram of FIG. 5. The schematic diagram which shows a magnetic path cross-section maximum state. The schematic diagram which shows the state at the time of a magnetic path cross-section reduction. The conceptual diagram which shows the modification of FIG. FIG. 10 is an equivalent circuit diagram of FIG. 9.

  Hereinafter, an embodiment of a variable voltage transformer according to the present invention will be described with reference to FIGS.

  The variable voltage transformer 1 generally includes an iron core 2 formed so as to constitute a closed magnetic circuit, a primary winding 3 wound around the iron core 2, and an iron core at a position away from the primary winding 3. The secondary winding 4 is wound around 2 and a housing 5 is provided for supporting and storing them.

  And like the normal constant voltage type transformer, the primary winding 3 is connected to a commercial power source 6, for example, and the secondary winding 4 is connected to a load 7.

  A screw hole 8 is provided between the primary winding 3 and the secondary winding 4 of the iron core 2 so as to be orthogonal to the flow direction of the magnetic flux flowing through the iron core 2. 9 is screwed to be able to advance and retreat.

  On the other hand, a through hole (not shown) is formed in the housing 5 so as to face the magnetic screw 9, and one end of the magnetic screw 9 protrudes outside the housing 5 through the through hole. A connecting rod may be connected to the magnetic screw 9 so that one end of the connecting rod protrudes outside the housing 5. A knob 10 is attached to the other end of the magnetic screw 9 or the connecting rod protruding from the housing 5.

  In the variable voltage transformer 1 configured as described above, as shown in FIG. 7, when the magnetic screw 9 is screwed so as to fill the screw hole 8 of the iron core 2, the magnetic path area, in other words, 100% of the cross-sectional area of the iron core 2 is secured, and the magnetic flux generated by the primary winding 3 almost reaches the secondary winding 4 side, and a voltage V corresponding to the number of turns of the secondary winding 4 is generated. .

  If the voltage V of the secondary winding 4 is to be lowered according to the state of the load 7, as shown in FIG. 8, the magnetic screw 9 that has filled the screw hole 8 is loosened and pulled out, so that the magnetic path In other words, the cross-sectional area of the iron core 2 decreases, and the amount of magnetic flux generated by the primary winding 3 is limited. Therefore, the amount of magnetic flux that reaches the secondary winding 4 side decreases, and the voltage V generated in the secondary winding 4 decreases.

  As described above, according to the present embodiment, the magnetic path area can be adjusted steplessly by the screwing amount of the magnetic screw 9, and the voltage generated in the secondary winding 4 can be adjusted steplessly. . Therefore, there is no need to provide a control winding for adjusting the amount of magnetic flux, a separate power source for supplying current to the control winding, and a current adjusting device for adjusting the flow rate of current from the separate power source. . As a result, it is possible to obtain the variable voltage transformer 1 that can change the voltage of the secondary winding 4 steplessly with a simple configuration without requiring a separate power source.

  By the way, in the said embodiment, the screw hole 8 and the magnetic screw 9 comprise the magnetic path area adjustment means and cross-sectional area adjustment means by this invention.

  Further, by marking the outer periphery of the knob 10 and marking the surface of the opposite housing 5, the operator can rotate the knob 10 at any angle so that the desired voltage V is applied to the secondary winding 4. You can see what happens. However, if the magnetic screw 9 is directly rotated, the advancement / retraction distance from the screw hole 8 of the magnetic screw 9 is small for the number of rotations, so that irregular means such as gears are interposed between the magnetic screw 9 and the knob 10. Then, the advance / retreat distance of the magnetic screw 9 may be increased by a slight rotation.

  Next, a modification of the variable voltage transformer 1 according to the present invention will be described with reference to FIGS.

  The same reference numerals as those in FIGS. 1 to 8 basically indicate the same constituent members, and thus detailed description thereof is omitted.

  A configuration different from the present embodiment and the above embodiment is the configuration of the iron core 2. That is, in this modification, the iron core 2 is divided into a primary iron core 2A and a secondary iron core 2B, the primary winding 3A is wound with the primary winding 3, and the secondary iron core 2B is provided with a secondary coil. The winding 4 is wound, and further, the screw core 8 and the magnetic screw 9 constituting the magnetic path area adjusting means according to the present invention are provided on the primary side iron core 2A.

  In this modification, the primary iron core 2A is installed on the wall only when necessary by installing the primary iron core 2A on a fixed location, for example, a wall of a house, and integrating the secondary iron core 2B with a product that requires a power source. The secondary side iron core 2B can be brought into contact with or close to 2A to take power. For example, in this modification, when a rechargeable battery is connected to the load 7, the magnetic screw 9 is attached according to the required voltage of the battery by interposing the charger 11 between the secondary winding 4. The necessary voltage can be charged by advancing and retracting.

  In this modification, the primary side iron core 2A is provided with the screw hole 8 and the magnetic screw 9 which constitute the magnetic path area adjusting means according to the present invention. However, the present invention is not necessarily limited to this configuration. You may make it comprise a magnetic path area adjustment means in the iron core 2B.

  In the embodiment and the modification described above, the voltage of the secondary winding 4 is adjusted by the operator turning the magnetic screw 9, but a voltmeter is provided between the terminals of the secondary winding 4. The magnetic screw 9 may be rotated while observing the voltmeter. Further, the voltage between the terminals of the secondary winding 4 is detected, and the advancement / retraction of the magnetic screw 9 from the screw hole 8 is detected. You may make it drive electrically.

  Further, in the embodiment and the modification described above, the screw hole 8 and the magnetic screw 9 are used as the magnetic path area adjusting means according to the present invention. For example, the gap is formed in a direction perpendicular to the magnetic flux flow direction of the iron core 2. The magnetic path area can be changed steplessly even if the magnetic plate is inserted into and removed from the gap.

  Although the above description demonstrated the case where the variable voltage type transformer 1 was used for charge of a battery, the brightness of a lighting fixture is applied also as a dimmer which dimmes by changing a voltage steplessly. be able to.

  DESCRIPTION OF SYMBOLS 1 ... Variable voltage type transformer, 2 ... Iron core, 2A ... Primary side iron core, 2B ... Secondary side iron core, 3 ... Primary winding, 4 ... Secondary winding, 5 ... Housing, 6 ... Commercial power supply, 7 ... Load, 8 ... screw hole, 9 ... magnetic screw, 10 ... knob, 11 ... charger.

Claims (11)

  Mechanically determine the iron core constituting the closed magnetic circuit, the primary and secondary windings wound around the iron core, and the magnetic path area of the iron core located between the primary and secondary windings. A variable voltage transformer characterized by comprising a magnetic path area adjusting means for stepless adjustment.   The magnetic path area adjusting means includes a screw hole formed in a direction perpendicular to the flow direction of the magnetic flux flowing through the iron core, and a magnetic screw screwed into the screw hole so as to be able to advance and retreat. The variable voltage type transformer according to claim 1.   2. The magnetic path area adjusting means comprises a gap formed in a direction perpendicular to the magnetic flux flow direction of the iron core, and a magnetic plate that is inserted into and removed from the gap so as to advance and retreat. Variable voltage type transformer.   The cross section of the iron core that forms the closed magnetic circuit, the primary and secondary windings wound around the iron core, and the iron core positioned between the primary and secondary windings is mechanically eliminated. A variable voltage transformer comprising: a cross-sectional area adjusting means for adjusting in stages.   The cross-sectional area adjusting means is composed of a screw hole formed in a direction perpendicular to the flow direction of the magnetic flux flowing through the iron core, and a magnetic screw screwed into the screw hole so as to advance and retract. Item 5. The variable voltage transformer according to Item 4.   5. The cross-sectional area adjusting means includes a gap formed in a direction perpendicular to the magnetic flux flow direction of the iron core, and a magnetic plate that is inserted into and removed from the gap so as to advance and retreat. Variable voltage transformer.   An iron core constituting a closed magnetic circuit, and a primary winding and a secondary winding wound around the iron core, respectively, and the iron core includes a primary-side iron core wound with the primary winding and the secondary winding. Cross-sectional area adjusting means for adjusting the cross-sectional area of the iron core mechanically steplessly in a closed magnetic path formed by the primary iron core and the secondary iron core. A variable voltage type transformer characterized by comprising.   The cross-sectional area adjusting means is composed of a screw hole formed in a direction perpendicular to the flow direction of the magnetic flux flowing through the iron core, and a magnetic screw screwed into the screw hole so as to advance and retract. Item 8. The variable voltage transformer according to Item 7.   8. The cross-sectional area adjusting means comprises a gap formed in a direction perpendicular to the magnetic flux flow direction of the iron core, and a magnetic plate that is inserted into and removed from the gap so as to advance and retreat. Variable voltage transformer.   It has a primary winding and a secondary winding respectively wound around an iron core that constitutes a closed magnetic circuit, and the cross-sectional area of the iron core is mechanically stepless when adjusting the voltage of the secondary winding steplessly. A voltage adjustment method for a variable voltage transformer, characterized in that adjustment is performed by changing the voltage.   A primary winding and a secondary winding respectively wound around an iron core constituting a closed magnetic circuit, and when adjusting the voltage of the secondary winding steplessly, based on the voltage between the secondary windings A method for adjusting a voltage of a variable voltage transformer, wherein the cross-sectional area of the iron core is mechanically steplessly adjusted.

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