JP2007059845A - Electromagnetic device, inverter circuit and illumination appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic device which is capable of controlling inductance or electrostatic capacitance during a manufacturing stage and also after manufacturing; and also to provide an inverter circuit and illumination appliance using such an electromagnetic device. <P>SOLUTION: An electromagnetic device comprises: a planar first winding wire 1 formed on a surface of a first printed circuit board 2; a second winding wire 3 which is formed on a surface of a second printed circuit board 4 and faces the first winding wire 1 in the direction of thickness; a magnetic core (core) 5 magnetically coupled with the first winding wire 1 and the second winding wire 3; and a first insulator 6 interposed between the first winding wire 1 and the second winding wire 3. Electrostatic capacitance is also formed between conductor regions 7, 8 formed on the first printed circuit board 2 and the second printed circuit board 4, so that said electrostatic capacitance can adjust entire electrostatic capacitance. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnetic device having both an inductance and a capacitance, an inverter circuit using the electromagnetic device for a resonance circuit, and a lighting fixture including the inverter circuit.

  Conventionally, an electromagnetic device having both inductance and capacitance as shown in FIG. 24 has been proposed (conventional example 1). This conventional apparatus forms a spiral LC composite member 42 in which a desired number of strip-shaped dielectric chips 40 are sandwiched and joined by two spiral coils 41 having a rectangular cross section, and a desired number of the spiral LC composites are formed. The member 42 is laminated and connected to form a noise filter circuit, a desired number of the noise filter circuits are laminated via the insulating sheet 43, and a magnetic circuit is formed at the center and outer periphery of the laminate. As shown in the figure, it is surrounded by a magnetic body 44 to constitute a filter circuit having a reactor function and a capacitor function, and is smaller and thinner than an electromagnetic device having a toroidal core, which is used for relatively high power applications. There is an advantage that reduction in cost and cost can be achieved (see Patent Document 1).

  Patent Document 2 includes a core, an insulating film wound around the core from one end side, and a conductor that is disposed in close contact with the insulating film and wound around the core together with the insulating film to form a coil. Further, an electromagnetic device (conventional example 2) is disclosed, and in recent years, composite parts having both functions of an inductor and a capacitor are also provided in chip parts.

Furthermore, instead of the dielectric chip as in Conventional Example 1, there is also an electromagnetic device in which a dielectric sheet made of, for example, polyimide is multilayered (Conventional Example 3).
JP 2000-312121 A Japanese Patent Laid-Open No. 7-2111549

  By the way, when the electromagnetic device as described above is operated at a current value of about several amperes at the most, for example, when used as a resonance circuit of an inverter circuit that constitutes a discharge lamp lighting device, in the conventional example 1, adjustment of inductance and capacitance is performed. It was difficult. This is because the distance between conductors (spiral coils) changes due to the thickness of the adhesive that fixes the strip-shaped dielectric chip and the capacitance also changes, and the distance between the conductors changes at places other than the dielectric chip. Therefore, even when the gap between the conductors is filled with a resin or the like, it is difficult to adjust the distance between the conductors, and the resin itself acts as a dielectric, thereby suppressing variations in design values. It is difficult. Furthermore, since it is manufactured in a series of manufacturing processes, there is a disadvantage that it is not versatile because a design change or a change in the manufacturing process is required when changing the constant of inductance or capacitance. Especially in the manufacturing process, the thickness of the substrate (dielectric) that determines the capacitance changes under the influence of temperature and pressure, making it difficult to obtain a desired design value, or changing the thickness of the substrate, etc. Manufacturing in advance, enormous amounts of data must be collected under various conditions, requiring a great deal of time and cost.

  Further, even in the case of Conventional Example 2 and chip parts, it is difficult to adjust the values of inductance and capacitance after manufacture. Alternatively, if an insulating material excellent in heat resistance such as polyimide resin is used as in Conventional Example 3, the base material is not easily deformed and variation in inductance and capacitance can be suppressed, but it is less expensive than polyimide resin. For example, there is a drawback in that the material cost is high compared to the case of using a copper-clad laminate for printed wiring boards (so-called FR-4 substrate) using a glass cloth base epoxy resin.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic device capable of adjusting inductance and capacitance even after the manufacturing stage and after manufacturing, an inverter circuit using the electromagnetic device, and a lighting fixture. Is to provide.

  In order to achieve the above object, the first aspect of the present invention provides a planar first winding in which connection terminals are provided on at least two terminals, and a connection terminal is provided on at least two terminals in the thickness direction. A planar type second winding disposed opposite to the first winding, a magnetic core magnetically coupled to the first winding and the second winding, and interposed between the first winding and the second winding. An electromagnetic wave having both an inductance and a capacitance by generating a capacitance between a first winding and a second winding facing each other across the first insulator. The apparatus is characterized in that adjustment means for adjusting at least one of inductance and capacitance is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, a planar type third winding is provided which is provided with connection terminals on at least two terminals, is disposed opposite to the second winding in the thickness direction, and is magnetically coupled to the magnetic core. And a second insulator interposed between the second winding and the third winding.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the adjusting means includes a conductor region provided on the same plane as at least one of the windings and connected to an arbitrary portion of the winding. It is characterized by that.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the conductor region is composed of a plurality of conductor portions arranged on the extension line of the winding so as to be spaced apart from each other.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the plurality of connection portions that are respectively electrically connected to the plurality of conductor portions are provided in at least one of the first and second insulators. It is characterized by.

  The invention of claim 6 is characterized in that, in the invention of any one of claims 1 to 5, the adjusting means rotates or translates the other winding with respect to one winding.

  The invention of claim 7 is the invention according to any one of claims 1 to 6, wherein the first winding and the second winding are formed in the same shape, and the positions of the connection terminals of each other are rotationally contrasted by approximately 180 degrees. It is characterized by being arranged in.

  The invention of claim 8 is characterized in that, in the invention of any one of claims 1 to 7, the adjusting means changes the distance in the thickness direction of the opposing windings.

  A ninth aspect of the invention is characterized in that, in any one of the first to eighth aspects of the invention, the adjustment means changes the number of magnetic cores.

  In order to achieve the above object, the invention of claim 10 is connected between one or more switching elements to which a DC voltage is applied and which are switched at a high frequency, and at least one switching element and a load. And an electromagnetic device according to any one of claims 1 to 9 constituting a resonance circuit.

  In order to achieve the above object, the invention of claim 11 comprises an appliance main body for holding the lamp, and an inverter circuit according to claim 10 mounted on the appliance main body for adjusting the power supplied to the lamp. Features.

  According to the first, tenth, and eleventh aspects of the present invention, it is possible to provide an electromagnetic device, an inverter circuit, and a lighting fixture that can adjust the inductance and the capacitance even during the manufacturing stage and after the manufacturing.

  According to the second aspect of the present invention, an insulated transformer can be configured with a mutual inductance generated between the inductance of the second winding and the inductance of the third winding.

  According to the invention of claim 3, the electrostatic capacity can be adjusted at an arbitrary position in the equivalent circuit.

  According to the fourth aspect of the present invention, not only the capacitance but also the inductance can be adjusted according to the presence / absence of connection of the divided portions of the winding and the number of connections.

  According to the fifth aspect of the present invention, the conductor portion can be easily wired through the connection portion provided in the first or second insulator.

  According to the invention of claim 6, the capacitance can be adjusted by relatively changing the positional relationship of the windings.

  According to invention of Claim 7, the distance between connection terminals can be taken large and a pressure | voltage resistant improvement can be aimed at.

  According to the eighth aspect of the invention, it is possible to adjust only the capacitance while keeping the inductance substantially constant.

  According to the invention of claim 9, by increasing or decreasing the number of magnetic cores, it is possible to adjust only the inductance while keeping the capacitance substantially constant.

(Embodiment 1)
As shown in FIG. 1, the electromagnetic device of the present embodiment includes a planar first winding 1 formed on the surface of the first printed circuit board 2 and a first winding formed on the surface of the second printed circuit board 4. 1, a second winding 3 facing the thickness direction (vertical direction in FIG. 1), a magnetic core (core) 5 magnetically coupled to the first winding 1 and the second winding 3, and the first winding 1 And a first insulator 6 interposed between the second windings 3.

  The first printed circuit board 2 is formed by forming a first winding 1 made of a spiral copper foil and a pair of conductor regions 7 made of a substantially triangular copper foil on the surface of a rectangular thin plate-shaped insulating base material. In the center of the base material, there are provided an insertion hole 2a through which the middle leg portion 5b of the core 5 is inserted, and a through hole (hereinafter referred to as a plated through hole) 2b in which the inner peripheral surface is plated with solder. Six plated through holes 2b arranged in the short direction and solder plated on the inner peripheral surface are provided at both ends of the insulating base material. Here, one terminal of the first winding 1 is connected to the central through hole 2b, and the other terminal is connected to the through hole 2b at one end (the right end in FIG. 1). The through hole 2 b constitutes a connection terminal for the first winding 1. In addition, the pair of conductor regions 7 are located diagonally across the insertion hole 2a, and one conductor region 7 is connected to the plated through hole 2b at one end (left end in FIG. 1), The conductor region 7 is connected to the plated through hole 2b at the end (the right end in FIG. 1) at the other end, and these two plated through holes 2b constitute connection terminals of the conductor regions 7, respectively.

  Similar to the first printed circuit board 2, the second printed circuit board 4 includes a second winding 3 made of a spiral copper foil on the surface of a rectangular thin plate-like insulating base material and a pair of conductors made of a substantially triangular copper foil. A region 8 is formed, and an insertion hole (not shown) and a plated through hole (not shown) through which the middle leg portion 5b of the core 5 is inserted are provided at the center of the insulating base, and are further opposed in the longitudinal direction. Six plated through holes 4b arranged in the lateral direction are provided at both ends of the insulating base. Here, one terminal of the second winding 3 is connected to the central plated through hole, and the other terminal is connected to the second plated through hole 4b from the end at one end (the right end in FIG. 1), These two plated through holes 4b constitute connection terminals for the second winding 3. In addition, the pair of conductor regions 8 are located diagonally across the insertion hole, and one conductor region 8 is connected to the second plated through hole 4b from the end at one end (left end in FIG. 1), The other conductor region 8 is connected to the second plated through hole 4b from the end (the right end in FIG. 1) at the other end, and these two plated through holes 4b constitute connection terminals of the respective conductor regions 8. ing. However, the central plated through hole is provided at a position that does not overlap with the central plated through hole 2b of the first printed circuit board 2 when the first printed circuit board 2 and the second printed circuit board 4 are overlapped.

  The first insulator 6 is formed in a rectangular thin plate shape having the same shape and dimensions as the first printed circuit board 2 and the second printed circuit board 4, and an insertion hole (not shown) through which the middle leg 5 b of the core 5 is inserted at the center. 6), and six plated through holes 6b arranged in the short direction are provided at both ends facing each other in the longitudinal direction.

The core 5 is an EE type ferrite magnetic core whose middle leg portion 5b has an elliptical column shape, and two core bodies 5 ₁ and 5 ₂ which are E shape ferrite magnetic cores having the same shape and the same dimensions as each other. 5b is inserted in each insertion hole 2a of the 1st printed circuit board 2, the 1st insulator 6, and the 2nd printed circuit board 4, and the 1st printed circuit board is in the window surrounded by the middle leg part 5b and a pair of outer leg parts 5a. 2. The first insulator 6 and the second printed circuit board 4 are combined to accommodate each other. In some cases, an air gap is provided in the middle leg portion 5b of the _two core bodies 5 ₁ and 5 ₂ in accordance with a desired inductance value and direct current superposition characteristics.

Thus, the first insulator 6 is placed between the first printed circuit board 2 and the second printed circuit board 4, and the plated through holes 2b provided at both ends in the longitudinal direction, respectively. 6b and 4b are joined and electrically connected, and the middle leg portion 5b is inserted through the insertion hole 2a as described above, and the first printed circuit board 2, the first insulator 6 and the second printed circuit board 4 are inserted into the window. By combining the two core bodies 5 ₁ and 5 _{2 so} as to house the core 5, the electromagnetic device of this embodiment is completed. However, the first printed circuit board 2, the first insulator 6, and the second printed circuit board 4 can be integrally formed using a copper-clad laminate for printed wiring boards, as shown in FIG. A large number of copper-clad laminates 9 for printed wiring boards in which the first winding 1, the second winding 3, and the conductor regions 7 and 8 are formed are overlapped with each other and bonded to the core 5, and the plated through hole 9a has a rod-like shape. The connection pin 9b may be provided. Here, the copper-clad laminate 9 for printed wiring board may be made of a polyimide resin having high heat resistance, but is made of an epoxy resin having slightly low heat resistance (for example, an FR-4 substrate). ).

  FIG. 3A shows an equivalent circuit of the electromagnetic device of this embodiment. That is, since the first winding 1 and the second winding 3 have a predetermined length, a minute inductance is continuously distributed between two connection terminals provided at both ends, and A minute electrostatic capacitance is distributed between the first winding 1 and the second winding 3 that are opposed to each other via one insulator 6, and two conductor regions that are opposed to each other via the first insulator 6 An electrostatic capacity, that is, adjustment capacitors Ca and Cb are also formed between 7 and 8. Therefore, as shown in FIG. 3 (b), the adjustment capacitor Ca, the LC resonator 10 including the inductance and the capacitance formed by the first winding 1, the second winding 3, and the first insulator 6 is provided. By connecting Cb, the electrostatic capacity of the entire electromagnetic device can be adjusted. For example, as shown in FIG. 4, DC blocking is applied between two switching elements (FETs) Q1 and Q2 that are switched at a high frequency when a DC voltage is applied, and between the low-side switching element Q2 and a load (discharge lamp) La. In the half-bridge type inverter circuit including the resonance circuit X connected via the coupling capacitor Cx, the LC resonator of the electromagnetic device of the present embodiment is used as the inductor Ld and the capacitor Cd of the resonance circuit X. In addition, the capacitance of the capacitor Cd constituting the resonance circuit X can be adjusted depending on whether or not the adjustment capacitors Ca and Cb are connected. Here, conventionally, fluctuations in the high-frequency output due to variations in the components of the inductor Ld and the capacitor Cd constituting the resonance circuit X have been corrected, for example, by changing the oscillation frequency of the switching elements Q1 and Q2. If the electromagnetic device is applied to the resonance circuit X, the capacitance of the capacitor Cd can be adjusted, so that there is an advantage that it is not necessary to change the oscillation frequency of the switching elements Q1 and Q2, and the switching control can be simplified.

  By the way, since fine adjustment cannot be made only by connecting the adjustment capacitors Ca and Cb, the conductor regions 7 are formed in the vicinity of the four corners of the first printed circuit board 2 as shown in FIG. The four conductor regions 7 are connected in advance to the outermost peripheral portion of the first winding 1 via the wiring pattern 7a, and the wiring pattern 7a is utilized by using a laser or the like as shown in FIG. 5B. The capacitance may be adjusted by cutting the line. Further, as shown in FIG. 5C, if the conductor region 7 is partially deleted while leaving the wiring pattern 7a, the capacitance can be continuously finely adjusted according to the width of the region to be deleted. Is possible. Further, if the wiring pattern 7a is connected to the inner peripheral portion of the first winding 1 so as to partially cross the first winding 1 via the insulating member 11 as shown in FIG. As shown in the equivalent circuit of (e), the adjustment capacitor Ce can be provided near the center rather than at both ends of the LC resonator 10, and the wiring pattern 7a is cut or the conductor region 7 is partially deleted. Thus, the capacitance of the adjustment capacitor Ce can be adjusted. Further, by providing the conductor region 7 in the portion of the first printed circuit board 2 where the first winding 1 is not provided, the heat generated in the first winding 1 is dissipated in the conductor region 7 through the wiring pattern 7a. As a result, there is also an advantage that the heat dissipation of the electromagnetic device is improved. Although only the first printed circuit board 2 is shown in FIGS. 5A to 5D, it goes without saying that the second printed circuit board 4 has the same configuration.

(Embodiment 2)
An exploded perspective view of the electromagnetic device of this embodiment is shown in FIG. However, since the basic configuration of the present embodiment is the same as that of the first embodiment, common components are denoted by the same reference numerals and description thereof is omitted.

  In the electromagnetic device of the present embodiment, as shown in FIG. 6, a third printed circuit board 13 having a third winding 12 formed on the surface thereof is disposed opposite to the second printed circuit board 4 with a second insulator 14 interposed therebetween. There is a feature in that.

  Similar to the first printed board 2 and the second printed board 4, the third printed board 13 includes a third winding 12 made of a spiral copper foil on the surface of a rectangular thin plate-like insulating base, and a substantially triangular copper. A pair of conductive regions 15 made of foil is formed, and an insertion hole (not shown) and a plated through hole (not shown) for inserting the middle leg portion 5b of the core 5 are provided in the center of the insulating base material, Further, six plated through holes 13b arranged in the short direction are provided at both ends of the insulating base material facing in the longitudinal direction. Here, one end of the third winding 12 is connected to the central plated through hole, and the other end is connected to the third plated through hole 13b from the end at one end (the right end in FIG. 6), These two plated through holes 13b constitute a connection terminal for the third winding 12. In addition, the pair of conductor regions 15 are located diagonally across the insertion hole, and one conductor region 15 is connected to the third plated through hole 13b from the end at one end (left end in FIG. 6), The other conductor region 15 is connected to the third plated through hole 13b from the end (right end in FIG. 6) at the other end, and these two plated through holes 13b constitute connection terminals of the respective conductor regions 15. ing. However, the central plated through hole is formed in the central plated through hole 2b of the first printed circuit board 2 and the second printed circuit board 4 when the first printed circuit board 2 and the second printed circuit board 4 and the third printed circuit board 13 are overlapped. The central plating is provided at a position that does not overlap any of the holes.

  The second insulator 14 is formed in a rectangular thin plate shape having the same shape and the same dimensions as the third printed circuit board 13, and an insertion hole (not shown) through which the middle leg portion 5 b of the core 5 is inserted is provided at the center. In addition, six plated through holes 14b arranged in the short direction are provided at both ends opposed to the longitudinal direction.

Thus, the first insulator 6 is sandwiched between the first printed board 2 and the second printed board 4 and the second insulator 14 is sandwiched between the second printed board 4 and the third printed board 13. And the plated through holes 2b, 6b, 4b, 13b, and 14b provided at both ends in the longitudinal direction are joined and electrically connected to each other, and the middle leg portion 5b is inserted into the insertion hole 2a. The two core bodies 5 ₁ , 5 ₂ are inserted so that the first printed board 2, the first insulator 6, the second printed board 4, the second insulator 14, and the third printed board 13 are accommodated in the window. Are combined to form the core 5 to complete the electromagnetic device of this embodiment.

  FIG. 7A shows an equivalent circuit of the electromagnetic device of this embodiment. That is, since the third winding 12 also has a predetermined length, a minute inductance is continuously distributed between the two connection terminals provided at both ends, and the inductance of the second winding 3 and the second winding 12 A mutual inductance M is generated between the three windings 12 and the second winding 3 and the third winding 12 constitute an insulating transformer. For example, in an insulated half-bridge inverter circuit in which a transformer T is inserted between a load (discharge lamp La) as shown in FIG. 7B, the LC resonator of the electromagnetic device of this embodiment is used as a resonance circuit. A mutual inductance M generated between the inductance of the second winding 3 and the inductance of the third winding 12 can be used as the transformer T as well as the X inductor Ld and the capacitor Cd.

(Embodiment 3)
In the first and second embodiments, only the capacitance can be adjusted, but in this embodiment, both the capacitance and the inductance can be adjusted. However, since the basic configuration of the present embodiment is the same as that of the first embodiment, common components are denoted by the same reference numerals and description thereof is omitted.

  The present embodiment is characterized in that a portion of the first winding 1 near the outer terminal is divided into a plurality of conductor portions 16 as shown in FIG. The conductor portion 16 is formed in a substantially square shape in plan view having the same width dimension as the other portions of the first winding 1, and is connected to a connection terminal (plating through hole 2b) on one end side of the first printed circuit board 2, respectively. The patterns are connected one-on-one. Note that the second winding 3 is provided up to a position facing the conductor portion 16 with the first insulator 6 interposed therebetween, and the terminal and the portion facing the terminal of the first winding 1 depend on the wiring pattern. The connecting terminals (plated through holes 4b) at both ends are connected to each other. Furthermore, the connection terminal to which the conductor portion 16 is connected is electrically connected to a plated through hole 6b provided in the first insulator 6, and these plated through holes 6b serve as connecting portions.

  FIG. 8B shows an equivalent circuit of the electromagnetic device of this embodiment. That is, a minute inductance is distributed to each of the plurality of conductor portions 16 divided from the first winding 1, and between the conductor portion 16 and the second winding 3 facing each other with the first insulator 6 interposed therebetween. Capacitance is generated, and the inductance (inductor Ly) and the capacitance (capacitor Cy) are disconnected at the connection terminal. Therefore, the conductor 16 is connected to the first winding 1 and the conductor to be connected. Depending on the number of the parts 16, it is possible to adjust not only the capacitance of the electromagnetic device but also the inductance.

  However, as shown in FIG. 9A, the portion near the outer terminal in the second winding 3 may be similarly divided into a plurality of conductor portions 17. In this case, a plurality of plated through holes 4b (connecting terminals) are arranged in two rows on one end side of the second printed circuit board 4, and the plated through holes 4b (connecting terminals) in the inner row are arranged via wiring patterns. The conductor portions 17 are connected in a one-to-one relationship, and the plated through holes 4b (connection terminals) in the outer row are connected to the plated through holes 6b in the first insulator 6 and the plated through holes 2b in the first printed circuit board 2, respectively. . An equivalent circuit of this electromagnetic device is as shown in FIG. 9B, and a minute inductance is distributed also in the conductor portion 17 divided from the second winding 3, and these inductances (inductors Lz) are connected at the connection terminals. Since it is in a disconnected state, the inductance of the electromagnetic device can be further finely adjusted according to whether or not the conductor portion 17 is connected to the first winding 1 and the number of conductor portions 17 to be connected.

(Embodiment 4)
FIG. 10 shows an exploded perspective view of the first printed circuit board 2, the first insulator 6, and the second printed circuit board 4 in the electromagnetic device of the present embodiment. However, since the basic configuration of the present embodiment is the same as that of the first embodiment, common components are denoted by the same reference numerals, and illustration and description thereof are omitted as appropriate.

  In the electromagnetic device according to this embodiment, the second printed circuit board 4 is changed to the first printed circuit board by changing the thickness d of the first insulator 6 interposed between the first printed circuit board 2 and the second printed circuit board 4. As a result, the distance between the first winding 1 and the second winding 3 changes and the capacitance can be adjusted.

  The first insulator 6 in the present embodiment is a material (for example, a polyester-based or polyvinyl chloride-based heat-shrinkable film) that heat-shrinks when the temperature rises, or a material whose thickness changes according to the applied voltage ( For example, a piezoelectric element such as PZT). That is, the temperature d of the first insulator 6 rises and heat shrinks, or the potential difference between the first winding 1 and the second winding 3 increases, so that the thickness d is reduced. As the distance between the winding 1 and the second winding 3 is reduced, the capacitance increases. However, the value of the inductance is constant regardless of the distance between the first winding 1 and the second winding 3. That is, the capacitance C is expressed by C = ε0 · εr · S / D, where ε0 is the dielectric constant in vacuum, εr is the relative dielectric constant, S is the conductor area, and D is the distance between the conductors. If the inter-conductor distance D (the distance d between the first winding 1 and the second winding 3) decreases, the capacitance C increases. Therefore, as shown by the solid line in FIG. 11A, the capacitance C increases as the thickness d decreases as the temperature Ta of the first insulator 6 increases (see the broken line in FIG. 11A), or As shown by the solid line in FIG. 11B, when the potential difference between the first winding 1 and the second winding 3 (voltage applied to the first insulator 6) increases, the capacitance C decreases as the thickness d decreases. It increases (see the broken line in FIG. 11B). However, if the material constituting the first insulator 6 is conductive, a thin film-like insulator may be interposed between the first winding 1 and the second winding 3. Further, instead of forming the first insulator 6 from a heat-shrinkable material, the first insulator 6 made of a flexible material is formed, and the first winding 1 and the second winding 3 and the first insulator 6 are formed. The insulator 6 may be sandwiched between insulators formed in a thin plate shape from a material that is desired from both sides (upper and lower sides in FIG. 10).

Here, in the half-bridge inverter circuit described in the first embodiment (see FIG. 4), the operation when the LC resonator of the electromagnetic device of the present embodiment is used as the inductor Ld and the capacitor Cd of the resonance circuit X will be described. To do. FIG. 12 shows the frequency characteristics of the load output in the inverter circuit. When the solid line “a” indicates that the thickness d of the first insulator 6 is relatively large, the broken line “b” indicates that the thickness d of the first insulator 6 is relatively large. Each time is small. Since the resonance frequency f0 of the resonance circuit X is expressed by f0 = {2π (Ld × Cd) ^1/2 } ⁻¹ , the resonance frequency f0 in the frequency characteristic indicated by the broken line is different from the resonance frequency f0 in the frequency characteristic indicated by the solid line A. f0 ′ decreases as the capacitance of the capacitor Cd increases (f0 ′ <f0). For example, when the inverter circuit operates at the oscillation frequency fs and the discharge lamp La is lit, if the temperature and applied voltage of the resonance circuit X are normal, the point A in the frequency characteristics of the solid line A becomes the operating point. On the other hand, when the load (discharge lamp La) is abnormal, for example, when the temperature of the LC resonator rises or the applied voltage rises, the thickness d of the first insulator 6 decreases, so that the capacitance is reduced. Since the value Cd increases and the frequency characteristic changes from the solid line A to the broken line B, if the oscillation frequency fs is constant, the operating point moves from the point A on the solid line A to the point B on the broken line B, and the inverter circuit High frequency output will decrease. Therefore, an increase in high frequency output due to a load abnormality can be suppressed by a change in the resonance frequency f0 of the resonance circuit X, and there is an advantage that the control of the inverter circuit can be simplified. Further, since the resonance frequency f0 of the resonance circuit X changes in accordance with the continuous change according to the temperature and the applied voltage, the inductance and capacitance of the LC resonator change, for example, It goes without saying that the electromagnetic device of this embodiment can also be used for feedback control such as temperature compensation for the high frequency output of the inverter circuit.

(Embodiment 5)
FIG. 13 shows an exploded perspective view of the first printed circuit board 2, the first insulator 6, and the second printed circuit board 4 in the electromagnetic device of the present embodiment. However, since the basic configuration of the present embodiment is the same as that of the first embodiment, common components are denoted by the same reference numerals, and illustration and description thereof are omitted as appropriate.

  In the electromagnetic device of the present embodiment, the first winding 1 is composed of a plurality of (three in the illustrated example) conductive patterns 1A, 1B, and 1C that are substantially U-shaped and are nested in each other. The second winding 3 is composed of a plurality of (three in the illustrated example) conductive patterns 3A, 3B, and 3C that have a letter shape and are nested in each other. These conductive patterns 1A,..., 3A,... Are connected to connection terminals T11, T12, T13, T14, T15, T16 or the second print made of plated through holes 2b provided at the end of the first printed board 2. It is connected to connection terminals T21, T22, T23, T24, T25, T26 made of plated through holes 4b provided at the end of the substrate 4. Specifically, the terminals of the outermost conductive patterns 1A, 3A are connected to the connection terminals T11, T16 and T21, T26 at both ends, respectively, and the terminals of the intermediate conductive patterns 1B, 3B are the second connection terminals from both ends. The terminals of the innermost conductive patterns 1C and 3C are respectively connected to the third connection terminals T13, T14 and T23 and T24 from both ends. The first insulator 6 is not provided with a plated through hole, but the connection terminals T11,... Of the first printed circuit board 2 and the connection terminals T21,. Connected directly.

  As described above, in the electromagnetic device of this embodiment, the first winding 1 and the second winding 3 are divided into a plurality of conductor patterns 1A,..., 3A,. As shown in the figure, each pair of conductive patterns (1A and 3A, 1B and 3B, 1C and 3C) facing each other across the first insulator 6 is represented by a circuit in which both ends of a pair of inductors are connected by a capacitor. The Therefore, as shown in FIG. 14 (b), when the adjacent connection terminals T16 and T12, T15 and T13, T26 and T22, T25 and T23 are connected, the conductor patterns 1A,..., 3A,. Therefore, the equivalent circuit is substantially the same as the equivalent circuit of the first embodiment except for the capacitance generated in the region sandwiched between the connection terminals. Further, as shown in FIG. 14C, one connection terminals T11, T12, and T13, T21, T22, and T23 are connected in parallel, and the other connection terminals T14, T15, and T16, and T24, T25, and T26 are connected in parallel. Since the current density of the current flowing through the conductor patterns 1A, ..., 3A, ... is reduced, there is an advantage that heat generation in the LC resonator can be suppressed. Since such LC resonators can increase the peak value of the current flowing through the circuit, the LC resonator is used in a circuit that needs to flow a large pulsed current instantaneously, for example, an igniter circuit for starting an HID lamp. Can be used for pulse transformers. Alternatively, the current density can be further reduced by connecting the connection terminals T11 and T21, T12 and T22,. In this case, however, another insulator and winding are required to generate the capacitance.

  In the present embodiment, the three first windings 1 and the second winding 3 are divided into three conductive patterns 1A,..., 3A,. .., T21,... Are connected, but the number of conductive patterns and the number of conductive patterns connected to the same connection terminals T11,. It may be determined according to the inductance and capacitance design.

(Embodiment 6)
An exploded perspective view of the electromagnetic device of this embodiment is shown in FIG. However, since the basic configuration of the present embodiment is the same as that of the first embodiment, common components are denoted by the same reference numerals, and illustration and description thereof are omitted as appropriate.

  In the electromagnetic device according to the present embodiment, the first printed circuit board 2, the second printed circuit board 4, and the first insulator 6 are all discs having the same dimensions, and the second printed circuit board 4 and the first insulator 6 are in the same shape. Are fixed to each other and only the first printed circuit board 2 is rotatable about the middle leg 5b of the core 5 inserted into the insertion hole 2a with respect to the second printed circuit board 4 and the first insulator 6. It has become. However, in this embodiment, the insertion holes 2a and 4a provided in the first printed circuit board 2, the second printed circuit board 4, and the first insulator 6 are all circular, and the middle leg portion 5b of the core 5 is cylindrical. It has become. Further, both ends of the spiral first winding 1 and the second winding 3 are individually connected to connection terminals including plated through holes 2b and 4b.

  Thus, in the state where both ends of the first winding 1 and the second winding 3 overlap, the opposing area of the two windings 1 and 3 becomes the maximum, so the equivalent circuit of the LC resonator 10 is shown in FIG. For example, in the state where the first printed circuit board 2 is rotated counterclockwise by θ [radians] as shown in FIG. 15A, the facing area of the two windings 1 and 3 decreases. An equivalent circuit of the LC resonator 10 is represented by FIG. That is, even after the electromagnetic device is completed, the capacitance can be adjusted according to the rotation angle of the first printed circuit board 2 (first winding 1).

  By the way, as shown in FIG. 16 (a), connection terminals composed of a plurality of plated through holes 2b, 4b are provided at equal intervals along the circumferential direction at the peripheral portions of the first printed board 2 and the second printed board 4. If the plurality of connection terminals (plated through holes 2b, 4b) and the outermost peripheral portions of the first winding 1 and the second winding 3 are connected in the radial direction with a conductor pattern, the equivalent of FIG. The LC resonator 10 shown as a circuit is configured, and the inductance can be adjusted according to the presence / absence and the number of connections of the plurality of connection terminals of the first printed board 2 and the second printed board 4. The connection terminals of the first printed circuit board 2 and the connection terminals of the second printed circuit board 4 are through holes (not shown) provided at equal intervals along the circumferential direction in the peripheral portion of the first insulator 6. ) And soldering a conductive pin (not shown) to the plated through holes 2b and 4b.

(Embodiment 7)
FIG. 17 shows an exploded perspective view of the main part of the electromagnetic device of this embodiment. However, since the basic configuration of the present embodiment is the same as that of the first embodiment, common components are denoted by the same reference numerals, and illustration and description thereof are omitted as appropriate.

  As shown in FIG. 17, the first printed circuit board 2 and the second printed circuit board 4 are integrally formed as a first double-sided board 18 made of a double-sided copper-clad laminate, and are also made of a double-sided copper-clad laminate. The substrate 19 and the third insulator 20 are overlapped. The first and second double-sided boards 18 and 19 are provided with rectangular insertion holes 18a and 19a through which the middle legs of the core are inserted, and three at the peripheral portions of the insertion holes 18a and 19a in the longitudinal direction. Plated through holes 18b and 19b are provided, and a total of three plated through holes 18c and 19c arranged at equal intervals in the lateral direction are provided at both ends facing in the longitudinal direction. Further, the first double-sided substrate 18 is provided with the first winding 1 on the front surface (upper surface in FIG. 17) and the second winding 3 on the back surface (lower surface in FIG. 17). 19, a third winding 21 is provided on the front surface (upper surface in FIG. 17), and a fourth winding 22 is provided on the back surface (lower surface in FIG. 17).

  18A and 18B are plan views of the first double-sided substrate 18 as viewed from one side (upper side in FIG. 17), and FIGS. 18C and 18D show the second double-sided substrate 19 on one side (FIG. 18). The top view seen from the upper side in FIG. However, illustration of the 1st coil | winding 1 and the 3rd coil | winding 21 is abbreviate | omitted in FIG.18 (b) (d). As shown in FIG. 18 (a), the first winding 1 is clockwise from the outside to the inside when viewed from one side, and the inner terminal is at the end on one end side (the lower side in FIG. 18 (a)). The left end of the side is connected to the plated through hole 18b, and the outer terminal is connected to the end of the same side (the lower left end in FIG. 18A) the plated through hole 18c. As shown in FIG. 18 (b), the second winding 3 is clockwise from the outside to the inside when viewed from one side, and the inner terminal is at the end on one end side (the upper side in FIG. 18 (b)). Are connected to the plated through hole 18b on the same side (the upper right end in FIG. 18B). Further, as shown in FIG. 18 (c), the third winding 21 is counterclockwise from the outside to the inside when viewed from the one side, and the inner terminal is at one end (FIG. 18 (c)). , The lower left end) is connected to the plated through hole 18b, and the outer end is connected to the same end (lower right end in FIG. 18C). Further, as shown in FIG. 18 (d), the fourth winding 22 is counterclockwise from the outside to the inside when viewed from the above-mentioned side, and the inner terminal is at one end (FIG. 18 (b)). Is connected to the plated through hole 18b on the upper right side, and the outer terminal is connected to the plated through hole 18c on the same side end (upper right end in FIG. 18B). Here, the terminals inside the first winding 1 and the third winding 21 are connected to each other through a plated through hole (not shown) provided in the third insulator 20, and the second winding 3 Terminals inside the fourth winding 22 are connected to each other through a plated through hole (not shown) provided in the third insulator 20.

  Thus, in the first and second double-sided boards 18 and 19, when the first winding 1 and the second winding 3, and the third winding 21 and the fourth winding 22 are viewed from the one side, respectively. , And the inductances of the windings 1, 3, 21, and 22 are constant, and the first winding 1, the second winding 3, the third winding 21, and the fourth winding 22 are constant. Since the facing area is substantially constant, the capacitance is also constant. However, since the arrangement of the connection terminals is different for each of the windings 1, 3, 21, and 22, the LC resonance expressed by an equivalent circuit equivalent to the equivalent circuit of FIGS. 15B and 15C described in the sixth embodiment. Thus, the capacitance can be adjusted as in the sixth embodiment. By increasing the number of turns of each of the windings 1, 3, 21, and 22, the ratio of the difference in inductance and capacitance for half a circle to the inductance and capacitance of the entire LC resonator 10 is reduced. The capacitance adjustment range can be arbitrarily set according to the number of turns.

  Even when a high voltage is applied between the first winding 1 and the third winding 21 and the second winding 3 and the fourth winding 22 that are connected in series with each other, a high voltage is applied. Since the connection terminals are distributed to both ends of the double-sided boards 18 and 19 facing in the longitudinal direction, the two windings facing each other (the first winding 1, the second winding 3, and the third winding as in the first embodiment). Compared to the case where the wire 21 and the fourth winding 22) have the same shape, the distance between the connection terminals is sufficiently large, so that the pressure resistance can be improved. That is, when the two windings have the same shape, the insulation distance at both ends of the winding is only the thickness of the insulator (insulating base material of the double-sided boards 18 and 19). Since the two-sided substrates 18 and 19 are distributed to both ends, the insulation distance can be increased. Furthermore, since the winding patterns formed on the front and back surfaces of the double-sided boards 18 and 19 have the same shape, there is an advantage that design work can be saved because the winding pattern drawings are common.

  If the total number of layers (the number of windings) is an even number, the winding is always finished at the outer side for the first time from the outside. Therefore, the connection terminals (plating through holes 18b, 18c, 19b) of the substrate (double-sided substrates 18, 19) are used. 19c) can be easily connected, and wiring can be connected to the connection terminal from various directions, thereby increasing the degree of design freedom. That is, when the electromagnetic device according to the present embodiment is mounted on, for example, a printed wiring board, wiring can be easily performed because the position of the connection terminal is close to the printed wiring board regardless of the mounting direction.

  By the way, if the windings (for example, the second winding 3 and the fourth winding 22) provided on one side of the double-sided boards 18 and 19 are translated along the diagonal lines of the double-sided boards 18 and 19, the windings ( Capacitance can be adjusted by uniformly reducing the facing areas of the first winding 1 and the second winding 3 and the third winding 21 and the fourth winding 22). Specifically, for example, when the second winding 4 and the fourth winding 22 are formed on the double-sided boards 18 and 19, they may be translated along a diagonal line. When the winding is translated in the longitudinal direction (longitudinal direction) or the lateral direction (short direction) of the double-sided substrates 18 and 19, the facing area of the winding is reduced only in the longitudinal direction or the lateral direction of the winding. In this case, the capacitance of the LC resonator 10 varies, but if the parallel movement is performed along the diagonal line as described above, the capacitance of the plurality of capacitors in the equivalent circuit of the LC resonator 10 is substantially the same. The design can be made easier by adjusting it while keeping it.

  Here, as shown in FIG. 19, a plurality of (for example, three) LC resonator blocks 30 capable of adjusting at least one of inductance and capacitance are superposed via an insulator 31 to form one electromagnetic wave. By configuring the device and adjusting the inductance and capacitance of each LC resonator block 30, for example, it is possible to easily realize an electromagnetic device in which three types of filters having different characteristics are combined into one. .

(Embodiment 8)
An exploded perspective view of the electromagnetic device of this embodiment is shown in FIG. However, since the basic configuration of the present embodiment is the same as that of the first embodiment, common components are denoted by the same reference numerals, and illustration and description thereof are omitted as appropriate.

  As shown in FIG. 20, there are a plurality of insertion holes 2a, 4a, 6a through which the middle leg portion 5b of the core 5 is inserted in the center of the first printed board 2, the second printed board 4, and the first insulator 6 ( In the illustrated example, two) are provided. That is, since the inductance of the LC resonator 10 changes depending on whether the first winding 1 and the second winding 3 are magnetically coupled to one or two cores 5, depending on the number of cores 5 to be magnetically coupled. Inductance can be adjusted. However, the number of cores 5 that can be magnetically coupled simultaneously is not limited to two, and may be three or more.

  By the way, the electromagnetic device demonstrated in Embodiment 1-8 is suitable for the inverter circuit which comprises the discharge lamp lighting device for carrying out the high frequency lighting of the discharge lamp La. For example, it can be used as the resonance circuit X in the full-bridge inverter circuit INV as shown in FIG. 21A or the resonance circuit X in the half-bridge inverter circuit INV as shown in FIG. . Further, as shown in FIGS. 21A to 21C, a power supply circuit (diode bridge DB and DC-DC converter CNV) for converting the AC voltage of the commercial AC power supply AC into a DC voltage for supplying to the inverter circuit INV, Alternatively, as shown in FIG. 21B, the pulse transformer PT provided in the igniter circuit IG for applying the starting voltage to the discharge lamp La is also used in the electromagnetic device (LC resonator 10) described in the first to eighth embodiments. Can be used. However, since the circuit configurations shown in FIGS. 21A to 21C are conventionally known, detailed description thereof will be omitted.

  FIG. 22 is a perspective view showing the structure of the inverter circuit INV as described above. In the illustrated example, a total of four electromagnetic devices 23, 24, 25, 26 are mounted horizontally on the printed wiring board 27, and another printed wiring board 28 for control is mounted vertically between the electromagnetic devices 25, 26. Has been. And these four electromagnetic devices 23-26 are mutually connected by the connection terminal which consists of a plating through hole. In addition, if the dimension of the x-axis direction and z-axis direction in each electromagnetic device 23-26 is made the same, it will be possible to wire each electromagnetic device 23-26 three-dimensionally as shown in the figure. In this case, regarding the allowable power of each of the electromagnetic devices 23 to 26, it is possible to set to adjust the distance in the y-axis direction, and for example, it can be adjusted by the height of the core 5 or the thickness of the insulator.

  FIG. 23 is a perspective view showing an example of a lighting fixture on which the above-described discharge lamp lighting device is mounted. This lighting fixture is a spotlight, and has a connector portion 31 that is detachably connected to a rail-like wiring path 30, a bottomed cylindrical fixture body 32 that is rotatably supported with respect to the connector portion 31, And a bowl-shaped reflecting plate 33 provided at the tip of the appliance main body 32, and the discharge lamp lighting device is built in the appliance main body 32.

1 is an exploded perspective view showing Embodiment 1. FIG. It is a perspective view of another structure same as the above. (A) (b) is a circuit diagram which shows the equivalent circuit same as the above. It is a circuit diagram of the inverter circuit using the same as the above. (A)-(e) is explanatory drawing explaining the adjustment method of an electrostatic capacitance same as the above. FIG. 6 is an exploded perspective view showing a second embodiment. (A) is a circuit diagram showing an equivalent circuit of the above, and (b) is a circuit diagram of an inverter circuit using the above. Embodiment 3 is shown, (a) is an exploded perspective view of the main part, (b) is a circuit diagram of an equivalent circuit. The other structure same as the above is shown, (a) is an exploded perspective view of the main part, (b) is a circuit diagram of an equivalent circuit. FIG. 10 is an exploded perspective view of a main part of the fourth embodiment. It is operation | movement explanatory drawing same as the above. It is operation | movement explanatory drawing of the inverter circuit using the same as the above. FIG. 10 is an exploded perspective view of a main part of the fifth embodiment. (A)-(c) is a circuit diagram of an equivalent circuit same as the above. Embodiment 6 is shown, (a) is an exploded perspective view, (b) (c) is a circuit diagram of an equivalent circuit. The other structure same as the above is shown, (a) is an exploded perspective view, (b) is a circuit diagram of an equivalent circuit. FIG. 10 is an exploded perspective view of main parts of Embodiment 7. (A) (b) is a top view of the 1st double-sided board in the same as the above, (c) (d) is a top view of the 2nd double-sided board in the same as the above. It is a disassembled perspective view of another structure same as the above. FIG. 10 is an exploded perspective view of an eighth embodiment. (A)-(c) is a circuit diagram of the discharge lamp lighting device using the inverter circuit which concerns on this invention. It is a perspective view of a discharge lamp lighting device same as the above. It is a perspective view of the lighting fixture which concerns on this invention. It is a perspective view which shows the conventional electromagnetic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st winding 2 1st printed circuit board 3 2nd winding 4 2nd printed circuit board 5 Core (magnetic core)
6 First insulator

Claims (11)

  A planar first winding in which connection terminals are provided on at least two terminals, respectively, and a planar second winding in which connection terminals are provided on at least two terminals and are arranged opposite to the first winding in the thickness direction. A first insulator comprising: a wire; a magnetic core magnetically coupled to the first winding and the second winding; and a first insulator interposed between the first winding and the second winding. An electromagnetic device having both an inductance and a capacitance by generating a capacitance between a first winding and a second winding opposed to each other with at least one of an inductance and a capacitance An electromagnetic device, characterized in that an adjustment means for adjusting the value of is provided.   At least two terminals, each having a connection terminal, disposed opposite to the second winding in the thickness direction, and magnetically coupled to the magnetic core, and between the second winding and the third winding The electromagnetic device according to claim 1, further comprising a second insulator interposed between the first and second insulators.   The electromagnetic device according to claim 1, wherein the adjusting unit includes a conductor region that is provided on the same plane as at least one of the windings and is connected to an arbitrary portion of the winding.   The electromagnetic device according to claim 3, wherein the adjusting unit includes a plurality of conductor portions obtained by dividing at least one of the first winding and the second winding in a state where they can be connected to each other.   The electromagnetic device according to claim 4, wherein a plurality of connection portions that are electrically connected to the plurality of conductor portions are provided in at least one of the first and second insulators.   The electromagnetic device according to any one of claims 1 to 5, wherein the adjusting means rotates or translates the other winding with respect to one winding.   The first winding and the second winding are formed in the same shape, and the positions of the mutual connection terminals are arranged at rotationally opposite positions by approximately 180 degrees. Electromagnetic devices.   The electromagnetic device according to claim 1, wherein the adjusting unit is configured to change a distance in a thickness direction of opposing windings.   The electromagnetic device according to claim 1, wherein the adjusting means changes the number of magnetic cores.   The resonance circuit is configured by connecting one or more switching elements to which a DC voltage is applied and switching at a high frequency, and at least one of the switching elements and a load. An inverter circuit comprising the electromagnetic device described above.   A lighting fixture comprising: a fixture main body for holding a lamp; and the inverter circuit according to claim 10 mounted on the fixture main body to adjust power supplied to the lamp.

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