JP2007311397A - Inductance device, and power supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inductance device compounding a plurality of inductance elements and arranged to take out the joint of two windings connected in series electrically and applicable to various types of circuitry while ensuring such effects as reduction in mounting area and enhancement in electrical characteristics, and to provide a power supply. <P>SOLUTION: A first flux loop is formed by first and second windings connected in series while arranging the winding direction, and a second flux loop is formed of a third winding. The second flux loop is branched into two paths and the relation with the first flux loop in the branch path is reversed for every branch path. A first branch line is connected with the joint of first and second windings. Since the first branch line can be used as the terminal of the first or/and second windings, the first and second windings can be combined as one winding or used as individual windings in the circuitry. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inductance device in which a plurality of inductance elements are combined and molded, and a power supply device including the inductance device.

  In the inductor and the transformer disclosed in Patent Document 1, as shown in FIG. 9, the core member 100 has an I-type core member and an E-type core so as to form two symmetrical magnetic flux loops M100 and M200. It is configured by combining core members. A first winding LM is wound around a common path portion of the magnetic flux loops M100 and M200 formed in the core member 100. A second winding L100 and a third winding L200 are respectively connected in series and wound around the branch paths of the two magnetic flux loops M100 and M200.

  The second and third windings L100, L200 can be made insensitive to the magnetic flux generated by the first winding LM, and the first winding LM is the second and third windings L100, L100, It can be made insensitive to the magnetic flux produced | generated by L200. The first winding LM and the second and third windings L100 and L200 are configured to be independent while sharing a part of the magnetic flux loop.

JP-A-8-298219

  However, in the inductor and the transformer disclosed in Patent Document 1, there is no disclosure regarding connecting a branch path to a connection point between the second winding and the third winding connected in series. There is no suggestion of electrically extracting the connection point. For this reason, when the circuit is configured using the inductor and the transformer described in Patent Document 1, the second winding and the third winding can be used as one inductance element. These windings cannot be used as separate and independent inductance elements. This is a problem due to restrictions on the circuit configuration.

  The present invention has been made in view of the above-described background art, and in an inductance device in which a plurality of inductance elements are combined and molded, the connection point of two windings connected in series can be electrically extracted. An inductance device that can be applied to various circuit configurations while ensuring the effect of reducing the mounting area and improving the electrical characteristics caused by integrally molding a plurality of inductance elements, and a power supply device including the inductance device are provided. The purpose is to do.

  In order to achieve the above object, an inductance device according to claim 1 is a core around which a first magnetic flux loop circulates and a core around which a second magnetic flux loop circulates, and has a shared portion with the first core. In addition, the second core having a pair of branch paths included in the shared portion is wound around each of the pair of branch paths in a direction in which the first magnetic flux loop is superimposed when they are connected in series with each other and energized. The first and second windings, the first branch line connected to the connection point of the first and second windings, and the second core, which is wound around the non-shared portion with the first core The first and second magnetic flux loops have the same magnetic flux direction in one of the pair of branch paths included in the shared portion of the first core and the second core, and the pair of branch paths The other is that the magnetic flux direction is opposite.

  In the inductance device according to claim 1, the winding direction is aligned in a direction in which the first magnetic flux loop is superimposed when energized to each of the pair of branch paths included in the shared portion of the first core and the second core. The first and second windings connected in series are wound. Here, the first branch line is connected to the connection point of the first and second windings. The second core is formed with a second magnetic flux loop around the pair of branch paths. The first magnetic flux loop and the second magnetic flux loop have the same magnetic flux direction in one of the pair of branch paths included in the shared portion of the first core and the second core, and the magnetic flux direction in the other of the pair of branch paths. Is the opposite direction. A third winding is wound around a portion of the second core that is not shared with the first core.

  As a result, the first to third windings are respectively wound and combined around the first and second cores that share a part, so that an area-saving combined inductance device can be configured. .

In addition, the first core and the second core are configured so that at least a part thereof has a shared portion. In the pair of branch paths of the second core included in the shared portion, the first core is The direction of the magnetic flux of the second magnetic flux loop that circulates around the second core is opposite to the direction of the magnetic flux of the first magnetic flux loop that circulates. Here, in the first core, the first and second windings are wound so that the first magnetic flux loop is superimposed on the portion corresponding to each of the two branch paths of the second core by energization. For this reason, the second magnetic flux loop circulates in the opposite direction to the winding direction between the first winding and the second winding. The electromotive forces induced in the first winding and the second winding by the magnetic flux of the second magnetic flux loop are opposite to each other and cancel each other.
Further, a third winding that forms a second magnetic flux loop is wound around the second core in a portion that is not shared with the first core. For this reason, in the first magnetic flux loop that circulates each branch path, the direction in which the magnetic flux circulates is reversed with respect to the winding direction of the third winding for each branch path. An electromotive force in the opposite direction is generated for each branch path with respect to the third winding. The electromotive force induced in the third winding is canceled out. The first magnetic flux loop that circulates around the first core around which the first and second windings are wound and the second magnetic flux loop that circulates around the second core around which the third winding is wound interfere with each other. Never do.

  A first branch line is connected to a connection point between the first and second windings connected in series. Since the first branch line can be used as the terminal of the first or / and second winding, the first winding and the second winding can be configured as separate windings. In addition to the case where the first and second windings are used as one winding, various circuit configurations can be realized.

  An inductance device according to a second aspect is the inductance device according to the first aspect, wherein the inductance device is wound around a first core and forms a forward transformer together with the first and second windings with the first core as a magnetic core. A fourth winding is provided.

  In the inductance device according to the second aspect, the fourth winding is wound around the first core together with the first and second windings to form a forward type transformer with the first core as a magnetic core. Thereby, a forward type transformer is constituted by the first and second windings and the fourth winding. In this case, if the circuit is configured with the fourth winding as the primary winding, the first and second windings as the secondary winding, and the first branch line as the intermediate tap of the secondary winding, A power supply device using a forward type transformer can be configured.

  The inductance device according to claim 3 is the inductance device according to claim 2, wherein the fourth winding includes a second branch line at an intermediate position of the winding.

  In the inductance device according to the third aspect, the second branch line is provided in the fourth winding wound in the same winding direction as the first and second windings. As a result, the fourth winding is the primary winding, the first and second windings are the secondary windings, the first branch line is the intermediate tap of the secondary winding, and the second branch line is 1 If a circuit is configured as an intermediate tap of the secondary winding, a push-pull forward converter can be configured.

  An inductance device according to claim 4 is the inductance device according to claim 2 or 3, wherein the first branch line is connected to one end of the third winding.

  In the inductance device according to the fourth aspect, the first branch line is directly connected to one end of the third winding. As a result, the first and second windings and the third winding can be connected with the shortest path, so that the wiring space can be minimized and heat loss in the conductive line can be reduced. Can do.

  Also, when the power supply device is configured with the first and second windings as the secondary winding of the transformer and the third winding as the smoothing coil, the intermediate tap of the secondary winding and the smoothing are previously set. A coil can be directly connected to the coil through the shortest path, and a power supply device with reduced conduction loss can be configured.

  An inductance device according to claim 5 is the inductance device according to claim 1, wherein the second core includes a core gap in a non-shared portion with the first core.

  In the inductance device according to the fifth aspect, since the second core has the core gap, the magnetic flux saturation density by the third winding wound around the second core can be reduced, and the magnetic flux saturation phenomenon in the second core. Can be prevented.

  A power supply device according to claim 6 is connected to both ends of the first and second windings connected in series with the inductance device according to claim 4, and is connected to the first winding via the first branch line. The first and second rectifying elements that regulate the direction of the current flowing through and the direction of the current flowing through the second winding in opposite directions, the fourth winding serving as the primary winding of the transformer, The second winding is a secondary winding of the transformer, and the third winding is a smoothing coil.

  According to another aspect of the power supply device of the present invention, a forward transformer is configured in which the first and second windings are secondary windings and the fourth winding is a primary winding. The first branch line is connected to the third winding, and currents flowing through the first and second windings are rectified in opposite directions by the first and second rectifying elements.

  As a result, in response to the fourth winding being periodically reversed and energized, a secondary current is alternately induced in the first and second windings and flows through the third winding to be smoothed. . A power supply device using a forward transformer can be configured by an inductance device in which a forward transformer and a smoothing coil are combined.

  According to the present invention, in the inductance device formed by combining a plurality of inductance elements, the first branch line is connected to the connection point of the first and second windings connected in series. The connection point of the second winding can be taken out electrically. In addition to the possibility of a circuit configuration in which the first and second windings are one inductance element, a circuit configuration in which each of the first winding and the second winding is an individual inductance element is possible. Provided are an inductance device capable of realizing various circuit configurations while ensuring effects such as reduction of mounting area and improvement of electrical characteristics due to integral molding of an inductance element, and a power supply device including the inductance device can do.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments in which an inductance device and a power supply device of the present invention are embodied will be described in detail with reference to the drawings based on FIGS.

  FIG. 1 is a perspective view showing an inductance device 11 according to the first embodiment. The core member 2 of the inductance device 11 has a structure in which a rectangular bottom plate portion and top plate portion are connected by three columnar portions 21 to 23 in a plan view. FIG. 2 is a cross-sectional view of the inductance device 11 when viewed from the direction of the top plate toward the bottom plate by cutting the inductance device 11 with columnar portions 21 to 23 parallel to the bottom surface of the bottom plate or the top surface of the top plate. . The columnar portions 21 and 22 are formed at adjacent corner portions of the outer periphery of the bottom plate portion and the top plate portion. Moreover, the columnar part 23 is formed along the outer periphery which opposes the outer periphery pinched | interposed into the columnar parts 21 and 22 among the outer periphery of a baseplate part and a top-plate part.

  The first to third windings L1 to L3 are wound around the respective columnar portions 21 to 23. The first winding L1 is wound around the columnar portion 21 counterclockwise between the terminal T1 and the terminal TM1. The second winding L2 is wound around the columnar portion 21 in a clockwise direction between the terminal T2 and the terminal TM1. The first winding L1 and the second winding L2 are connected by a terminal TM1. The terminal TM1 forms a first branch line. Since the first winding L1 wound around the columnar portion 21 and the second winding L2 wound around the columnar portion 22 are wound in opposite directions, the columnar portions 21 and 22 are formed as bottom plate portions. And it connects with a top-plate part, and comprises a 1st core. As shown in FIG. 3, the magnetic flux that goes around the first core is the first magnetic flux loop B1.

  The third winding L3 is wound around the columnar portion 23 counterclockwise between the terminals T31 and T32. The columnar portion 23 around which the third winding L3 is wound constitutes a second core that returns to the columnar portion 23 via two branch paths at the columnar portions 21 and 22 via the bottom plate portion and the top plate portion. As shown in FIG. 3, the magnetic flux circulating around the second core is branched into two branch paths to form a second magnetic flux loop B2.

  Here, FIG. 3 shows magnetic flux paths of the first and second magnetic flux loops B1 and B2. The first magnetic flux loop B1 is formed by energizing the first and / or second windings L1 and L2 either from the terminal T1 to the terminal TM1, from the terminal TM1 to the terminal T2, or from the terminal T1 to the terminal T2. A first magnetic flux loop B <b> 1 is formed from the columnar part 21 through the top plate part to the columnar part 22, and returns to the columnar part 21 through the bottom plate part. The second magnetic flux loop B2 is formed by energizing the third winding L3 from the terminal T31 toward the terminal T32. A second magnetic flux loop B2 is formed that branches from the columnar part 23 to the columnar parts 21 and 22 through the top plate part and returns to the columnar part 23 through the bottom plate part.

  Since the columnar portions 21 and 22 are shared by the first core and the second core, the first magnetic flux loop B1 and the second magnetic flux loop B2 are mixed in the columnar portions 21 and 22 (region X1 and region X2). ). In the region X1 of the columnar portion 21, the first magnetic flux loop B1 and the second magnetic flux loop B2 are in the opposite magnetic flux direction, and in the region X2 of the columnar portion 22, the first magnetic flux loop B1 and the second magnetic flux loop B2 are the same. Direction of magnetic flux. Since the relationship in the magnetic flux direction between the first magnetic flux loop B1 and the second magnetic flux loop B2 is reversed between the region X1 and the region X2, the influence of the external magnetic flux such as electromotive force is offset. The magnetic flux density is not affected by the presence of other magnetic flux loops.

  According to the inductance device 11 of the first embodiment, the first to third windings L1 to L3 are wound around the columnar portions 21 to 23. The first core around which the first magnetic flux loop B1 formed by the first and second windings L1, L2 circulates and the second core around which the second magnetic flux loop B2 formed by the third winding circulates The columnar parts 21 and 22 are shared with a part of the plate part and the bottom plate part. Since the inductance element formed by the first and / or second windings L1 and L2 and the inductance element formed by the third winding L3 are combined and molded, the area-saving inductance device 11 can be configured.

  In addition, the magnetic flux direction of the second magnetic flux loop B2 that circulates the second core that is formed by the third winding L3 and has two branch paths, and circulates around the first core that is formed by the first and second windings L1 and L2. The direction of the magnetic flux of the first magnetic flux loop B1 is the opposite direction (region X1) in the columnar portion 21 included in the shared portion of the first and second cores, and the same direction (region X2) in the columnar portion 22. For this reason, in the 1st core, the electromotive force by the 2nd magnetic flux loop B2 from the outside is canceled, and in the 2nd core, the electromotive force by the 1st magnetic flux loop B1 from the outside is canceled. In an inductance device 11 configured by combining a plurality of inductance elements with a part of a shared portion in the columnar portions 21 and 22, a first core around which first and second windings L1 and L2 are wound The first magnetic flux loop B1 that circulates around the second magnetic flux loop B2 that circulates around the second core around which the third winding L3 is wound does not interfere with each other.

  A terminal TM1 is provided at a connection point between the first and second windings L1 and L2 connected in series, and the first branch line is connected. Therefore, the first and second windings L1 and L2 can be configured as a coil element which is one inductance element by the terminal T1 and the terminal T2. In addition, the first and second windings L1, L2 can be taken out as independent inductance elements by the terminal T1, the terminal TM1, the terminal T2, and the terminal TM1, respectively. Thereby, for example, the first and second windings L1 and L2 can be configured as primary / secondary windings to form a transformer element. Since the first branch line can be taken out to the terminal TM1, the first and second windings L1 and L2 can be configured as individual inductance elements. In addition to the case where the first and second windings L1 and L2 are one inductance element, various circuit configurations can be realized.

  FIG. 4 is a cross-sectional view of the inductance device 12 of the second embodiment. In addition to the inductance device 11 of the first embodiment, a fourth winding L4 is provided. The fourth winding L4 is wound around the columnar portion 22 from the terminal T41 in the clockwise direction, and is further wound around the columnar portion 21 in the counterclockwise direction, and is connected to the terminal T42. The winding direction in each of the columnar portions 21 and 22 is the same direction as the first winding L1 and the second winding L2.

  Further, the terminal TM1 and the terminal T31 in the inductance device 11 of the first embodiment are not provided. A first branch line, which is a connection point between the first and second windings L 1 and L 2, is directly connected to the third winding L 3 inside the inductance device 12.

  Thereby, a forward type transformer can be constituted by the first and second windings L1, L2 and the first winding L4. In this case, if the fourth winding L4 is the primary winding of the transformer and the first and second windings L1 and L2 are the secondary windings of the transformer, the intermediate tap of the secondary winding is the third. It can be set as the structure connected directly to the coil element comprised by the coil | winding L3. The connection between the intermediate taps of the first and second windings L1 and L2, which are secondary windings of the transformer, and the third winding L3 can be configured with the shortest wiring length. The wiring space can be saved and the wiring resistance can be reduced.

  FIG. 5 is a circuit diagram showing an application example of the inductance devices 11 and 12. This is a power supply device that uses a forward-type transformer that is switching-controlled in a full-bridge configuration. A fourth winding L4 similar to the inductance device 12 is added to the inductance device 11. As a result, the inductance device 11 is configured as a forward transformer with the fourth winding L4 as a primary winding and the first and second windings L1 and L2 as secondary windings. The third winding L3 is a smoothing coil. The terminals T41 and T42 of the fourth winding L4 are connected to a full-bridge transistor. The cathode terminals of the diode elements D1 and D2 are connected to the terminals T1 and T2 which are both ends of the first and second windings L1 and L2. The anode terminals of the diode elements D1 and D2 are connected to the negative electrode of the output terminal. The terminal TM1 is connected to the terminal T31 of the third winding L3. The terminal T32 is connected to the positive electrode of the output terminal. A smoothing capacitor is connected between the output terminals. Thereby, the power supply device which uses a forward type | mold transformer can be comprised.

  If the inductance device 12 is used, the terminal TM1 and the terminal T31 can be directly connected. Thereby, in the secondary side circuit, the wiring length from the first and second windings L1 and L2 that are the secondary side windings to the third winding L3 that is the smoothing coil can be made the shortest distance. The wiring length in the power supply device can be shortened, the wiring space can be saved, and the heat loss in the wiring path can be reduced.

  FIG. 6 is a cross-sectional view of the inductance device 13 of the third embodiment. In addition to the inductance device 12 of the second embodiment, a terminal TM2 for taking out the second branch line from an intermediate position of the fourth winding L4 is provided. Here, the intermediate position is a position between the winding of the columnar part 21 and the winding of the columnar part 22.

  Thereby, in the 1st and 2nd windings L1 and L2 and the 4th winding L4 which constitute a forward type transformer, an intermediate tap can be taken out from each of the primary side and the secondary side. A power supply device utilizing the inductance device 13 is shown in FIG. The primary circuit configuration of the forward transformer can be a push-pull configuration. That is, the terminal TM2 of the intermediate tap of the fourth winding L4 is connected to the primary power source, and the terminals T41 and T42 at both ends of the fourth winding L4 are connected to the respective switching elements.

  A core member 2A shown in FIG. 8 is a modification of the core member applied to the inductance devices 11 to 13 of the first to third embodiments. The second core columnar part 23 around which the third winding L3 is wound has a core gap G. When the forward type transformer is controlled by the circuit configuration shown in the power supply device shown in FIGS. 5 and 7 by the first and second windings L1 and L2 and the fourth winding L4, the energizing direction of the forward type transformer is Control is performed such that the direction of the first magnetic flux loop B1 that is periodically inverted and circulates around the first core changes periodically. For this reason, the magnetic flux does not remain in the first core, and even if there is no core gap, the magnetic flux density of the first core is never saturated. On the other hand, in the third winding L3 that is used as a smoothing coil that is always energized from the same direction, the direction of the second magnetic flux loop B2 is always the same. In order to avoid saturation of the magnetic flux density of the second core, it is effective to provide the core gap G. Here, the core gap G needs to be provided only for the third winding L3. The core gap G is preferably provided in the columnar portion 23 that is a non-shared portion with the first magnetic flux loop B1 and the second magnetic flux loop B2.

It goes without saying that the present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention.
For example, in the present embodiment, as the core members 2 and 2A, the columnar portions 21 and 22 around which the first and second windings L1 and L2 are wound, and the columnar portion 23 around which the third winding L3 is wound. However, the present invention is not limited to this. The cross-sectional shape of each columnar part is not limited as long as it includes a columnar part around which each of the first to third windings L1 to L3 is wound.
Moreover, in the core member 2 shown in 1st Embodiment, although the case where a baseplate part and a top-plate part have a rectangular shape by planar view was illustrated, this invention is not limited to this. It goes without saying that the bottom plate portion and the top plate portion may have a triangular shape or other polygonal shapes. A second portion having two branch paths through the columnar portions 21 and 22 through which the first magnetic flux loop can be formed via the bottom plate portion and the top plate portion, and through the columnar portions 21 and 22 through the bottom plate portion and the top plate portion. What is necessary is just to provide the columnar part 23 which can form a magnetic flux loop.
Further, as an example of the power supply device, FIG. 5 shows a power supply device with a full bridge configuration, and FIG. 7 shows a power supply device with a push-pull configuration, but the present invention is not limited to this, The power supply device can be similarly configured.
The illustrated power supply apparatus performs a circuit operation in which the power supply to the primary winding of the forward transformer is periodically reversed. According to this circuit operation, the circulation direction of the first magnetic flux loop that circulates around the first core is periodically reversed, and the first core can be prevented from being magnetized. However, the present invention is not limited to this. The present invention can be similarly applied to a circuit configuration in which power is supplied in the same direction intermittently with respect to the primary winding. In this case, by providing the core gap in the first core, it is possible to prevent the first magnetic flux loop that goes around the first core from being magnetically saturated according to the magnetization remaining in the first core.

It is a perspective view of the inductance device of a 1st embodiment. It is sectional drawing of the inductance apparatus of 1st Embodiment. It is a figure which shows the magnetic flux loop in the inductance apparatus of 1st Embodiment. It is sectional drawing of the inductance apparatus of 2nd Embodiment. It is a circuit diagram of the power supply device which uses the inductance apparatus of 1st and 2nd embodiment. It is sectional drawing of the inductance apparatus of 3rd Embodiment. It is a circuit diagram of the power supply device which uses the inductance apparatus of 3rd Embodiment. It is a perspective view which shows the modification of the core member used for the inductance apparatus of embodiment. It is a figure which shows the inductance and transformer of patent document 1. FIG.

Explanation of symbols

2, 2A Core members 11, 12, 13 Inductance devices 21, 22, 23 Column B1 First magnetic flux loop B2 Second magnetic flux loop D1, D2 Diode element G Core gap L1 First third winding L2 Second winding L3 Third winding L4 Fourth winding T1, T2, T31, T32, T41, T42, TM1, TM2 terminals

Claims (6)

A first core around which the first magnetic flux loop circulates;
A core around which the second magnetic flux loop circulates, having a shared portion with the first core, and a second core having a pair of branch paths included in the shared portion;
First and second windings wound around each of the pair of branch paths in a direction in which the first magnetic flux loops are superposed when connected in series with each other and energized;
A first branch line connected to a connection point of the first and second windings;
A third winding wound around a non-shared portion with the first core in the second core,
The first and second magnetic flux loops have the same direction of magnetic flux in the shared portion of one of the pair of branch paths in the second core and the first core, and the pair of branch paths in the second core. The inductance device characterized in that the direction of magnetic flux is opposite in the shared portion of the other and the first core.   The inductance according to claim 1, further comprising a fourth winding wound around the first core and having a first core as a magnetic core and constituting a forward transformer together with the first and second windings. apparatus.   The inductance device according to claim 2, wherein the fourth winding includes a second branch line at an intermediate position of the winding.   The inductance device according to claim 2, wherein the first branch line is connected to one end of the third winding.   The inductance device according to claim 1, wherein the second core includes a core gap in a portion not shared with the first core. An inductance device according to claim 4;
A current direction flowing through the first winding and a current direction flowing through the second winding are connected to both ends of the first and second windings connected in series, and through the first branch line, and Comprising first and second rectifying elements that regulate in the opposite direction;
The fourth winding is a primary winding of a transformer, the first and second windings are secondary windings of the transformer, and the third winding is a smoothing coil. Power supply.

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