JP6504400B2 - Power supply and lighting - Google Patents

Description

  Embodiments of the present invention relate to a power supply and a luminaire.

  As a power supply device, there is a switching power supply device that generates a predetermined voltage and current using a switching element. In a switching power supply, on and off of switching elements are switched intermittently to generate high frequency current, which is sent to an inductor for power conversion. In such a switching power supply device, it is possible to miniaturize parts used by increasing the switching frequency, and to miniaturize the device by high-density mounting.

  On the other hand, in a switching power supply, electromagnetic interference (EMI) is generated based on switching noise. EMI is mixed into the input and output wiring as noise. For this reason, the switching power supply apparatus is provided with a noise filter for suppressing noise. In a switching power supply device, it is important to suppress coupling between an inductor for power conversion and an inductor of a noise filter.

JP, 2012-079498, A

  Embodiments of the present invention provide a power supply and a luminaire in which coupling between an inductor for power conversion and an inductor for suppressing noise is suppressed.

A power supply device according to an embodiment includes a substrate having a first surface, an insulating main body provided on the first surface, a first inductor serially connected to one of power supply lines, and the first inductor. A second inductor provided on the surface, the second inductor being switch-driven by the switching element, and on the first surface, between the main body of the first inductor and the main body of the second inductor; And a capacitor connected between the power supply lines. The body of the capacitor is spaced apart from the body of the first inductor and is in contact with the body of the second inductor .

  In this embodiment, since the main body of the capacitor provided between the first inductor and the second inductor is disposed apart from the main body of the first inductor, the noise generated in the second inductor is conducted to the first inductor Can be suppressed.

FIG. 1A is a front view illustrating the appearance of the switching power supply device according to the first embodiment, and FIG. 1B is a plan view. FIG. 2A is a front view illustrating the appearance of an inductor for a filter, and FIG. 2B is a plan view illustrating the appearance of an inductor for a filter. FIG. 2C is a front view illustrating the appearance of the filter capacitor, and FIG. 2D is a plan view illustrating the appearance of the filter capacitor. FIG. 2E is a front view illustrating the appearance of the switching inductor, and FIG. 2F is a plan view illustrating the appearance of the switching inductor. It is a circuit diagram which illustrates the switching power supply device of a 1st embodiment. It is a schematic diagram for demonstrating a part of manufacturing method of the switching power supply device of 1st Embodiment. It is a table | surface of the example of a measurement of the normal mode noise of a switching power supply device. FIG. 6A is a front view illustrating the appearance of the switching power supply device according to the second embodiment. FIG. 6B is a plan view illustrating the appearance of the switching power supply device according to the second embodiment. It is a fragmentary sectional view which illustrates the lighting fixture concerning a 3rd embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio of sizes between parts, and the like are not necessarily the same as the actual ones. In addition, even in the case of representing the same portion, the dimensions and ratios may be different from one another depending on the drawings.
In the specification of the present application and the drawings, the same elements as those described above with reference to the drawings are denoted by the same reference numerals, and the detailed description will be appropriately omitted.

First Embodiment
FIG. 1A is a front view illustrating the appearance of the switching power supply device according to the first embodiment, and FIG. 1B is a plan view.
FIG. 2A is a front view illustrating the appearance of an inductor for a filter, and FIG. 2B is a plan view illustrating the appearance of an inductor for a filter. FIG. 2C is a front view illustrating the appearance of the filter capacitor, and FIG. 2D is a plan view illustrating the appearance of the filter capacitor. FIG. 2E is a front view illustrating the appearance of the switching inductor, and FIG. 2F is a plan view illustrating the appearance of the switching inductor.
FIG. 3 is a circuit diagram illustrating the switching power supply device of the present embodiment.
FIG. 4 is a schematic view for explaining a part of the method of manufacturing the switching power supply device of the present embodiment.
FIG. 5 is a table of measurement examples of normal mode noise of the switching power supply device.
As shown in FIGS. 1A and 1B, the switching power supply device 10 according to the present embodiment includes a substrate 12, a noise filter 14, and an inductor 18. The switching power supply 10 includes power supply input terminals 10a and 10b and output terminals 10c and 10d. An alternating current power supply 2 is connected to the power supply input terminals 10a and 10b. AC power supply 2 is, for example, a commercial power supply. The output terminal 10c outputs a positive potential with respect to the potential of the output terminal 10d. A light emitting module 60 is connected to the output terminals 10c and 10d. The light emitting module 60 includes a light emitting element 61 which is turned on upon receiving the supply of direct current power. The light emitting module 60 includes a plurality of light emitting elements 61 connected in series in this example. The switching power supply device 10 is an AC-DC converter that is supplied with AC power from the AC power supply 2, converts the power into DC power, and outputs the DC power.

  The substrate 12 includes a first surface 12 a and a second surface 12 b. The second surface 12 b is a surface opposite to the first surface 12 a. In the following, it is assumed that the first surface 12a is provided in parallel to the X axis and the Y axis orthogonal to the X axis. In addition, the first surface 12 a is oriented in the positive direction of the Z axis orthogonal to the X axis and the Y axis. Therefore, the second surface 12 b is parallel to the X axis and the Y axis and directed in the negative direction of the Z axis.

  Although not shown, the substrate 12 includes an insulating base, and a wire formed of a conductive material such as copper foil on one side or both sides of the base. The insulating base is, for example, paper phenol, glass epoxy or the like. Hereinafter, the substrate 12 will be described as a double-sided substrate in which the wiring is formed on both sides of the base material, but the substrate 12 is not limited to the double-sided substrate, and may be a single-sided substrate or another multilayer substrate.

  The shape of the substrate 12 can be any shape. The shape of the substrate 12 can be, for example, rectangular. In this example, the substrate 12 includes a rectangular portion and a trapezoidal portion. The rectangular portion has a long side in the X-axis direction. The trapezoidal portion has a short side connected to the short side of the rectangular portion and a long side opposite to the short side. The shape of the substrate 12 in this example is the same width up to a predetermined position in the positive direction of the X axis, and the width becomes wider as it moves in the positive direction of the X axis than the predetermined position. This is a shape suitable to be inserted into the base when forming a lighting apparatus of another embodiment described later.

  The noise filter 14 and the inductor 18 are mounted on the first surface 12 a of the substrate 12. The noise filter 14 includes an inductor 15 and a capacitor 16. The inductor 15, the capacitor 16 and the inductor 18 are disposed on the first surface 12a of the substrate 12 in this order along the X-axis direction. That is, the capacitor 16 is provided between the inductor 15 and the inductor 18 of the noise filter 14. Further, in this example, the power supply input terminals 10 a and 10 b are provided in the negative direction of the X axis relative to the inductor 15. The output terminals 10 c and 10 d are provided in the positive direction of the X axis more than the inductor 18.

  As shown in FIGS. 2A and 2B, the inductor 15 includes a main body 15a, terminals 15b and 15c, and a coil 15d. The main body 15a includes a drum shape including the central axis C1 in the Z-axis direction. This drum shape is a core of a magnetic body, and a wire is wound to form a coil 15d. The inductor 15 is disposed on the substrate 12 such that the central axis C1 of the coil is substantially parallel to the Z axis. Both ends of the coil are connected to the terminals 15b and 15c, respectively. The terminals 15 b and 15 c are provided at positions opposite to the diameter of the main body 15 a at the lower part of the main body 15 a. The terminals 15 b and 15 c are formed of a highly conductive material such as copper or an alloy containing copper. The inductor 15 is connected to the wiring pattern formed on the first surface 12 a of the substrate 12 by the terminals 15 b and 15 c provided at the lower part. The main body 15a of the inductor 15 includes a length L1 parallel to the X-axis direction. The main body 15a of the inductor 15 includes a length (width) W1 parallel to the Y-axis direction. The main body 15a of the inductor 15 includes a length (height) H1 parallel to the Z-axis direction.

  As shown in FIGS. 2 (c) and 2 (d), the capacitor 16 includes a main body 16a and terminals 16b and 16c. The main body 16a has a substantially rectangular parallelepiped shape including a length L2 parallel to the X-axis direction, a length (width) W2 parallel to the Y-axis direction, and a length (height) H2 parallel to the Z-axis direction is there. The main body 16 a is formed of an insulating material such as a synthetic resin. The terminals 16 b and 16 c are provided at both ends in the Y axis direction at the lower part of the main body 16 a. The terminals 16 b and 16 c are formed of a lead made of a highly conductive material such as copper or an alloy containing copper. The capacitor 16 is connected to the wiring pattern formed on the first surface 12 a of the substrate 12 by the terminals 16 b and 16 c provided at the lower part. The capacitor 16 is, for example, a film capacitor.

  As shown in FIGS. 2 (e) and 2 (f), the inductor 18 includes a body 18a and terminals 18b-18e. The main body 18a has a substantially rectangular parallelepiped shape including a length L3 parallel to the X-axis direction, a length (width) W3 parallel to the Y-axis direction, and a length (height) H3 parallel to the Z-axis direction. is there. In the main body 18a of the inductor 18, a wire is wound around the core of a rectangular parallelepiped magnetic body having a central axis C2 extending in a direction parallel to the X-axis. That is, in the vicinity of the inductor 18, the inductor 18 is driven to generate a magnetic field of a direction component parallel to the X axis. As described later, a choke coil of the DC-DC converter 30 is wound around the core of the magnetic body as the main winding 36, and a drive winding of the output element 31 is wound around the auxiliary winding 37. . Terminals 18 b and 18 c are connected to both ends of the main winding 36, and terminals 18 d and 18 e are connected to both ends of the auxiliary winding 37. The terminals 18 b to 18 e are provided on the lower side of the main body 18 a and on opposite sides parallel to the Y axis. The inductor 18 is connected to the wiring pattern formed on the first surface 12 a of the substrate 12 by the terminals 18 b to 18 e provided at the lower part. The inductors 15 and 18 may be disposed as long as the central axis C1 of the coil of the inductor 15 and the central axis C2 of the coil of the inductor 18 are orthogonal to each other, and is not limited to the above-described arrangement.

  The inductor 15, the capacitor 16, and the inductor 18 are disposed along the X-axis, and a space is provided between each component for the accuracy in component mounting and chucking of the automatic mounting machine, etc. . Specifically, a space Δ1 is provided between the lower portion of the main body 15 a of the inductor 15 and the lower portion of the main body 16 a of the capacitor 16. A space Δ2 is provided between the lower portion of the main body 16 a of the capacitor 16 and the lower portion of the main body 18 a of the inductor 18. Spaces Δ1 and Δ2 may be the same length or may be different lengths. For example, by setting the space Δ1> Δ2, the contact between the inductor 15 and the capacitor 16 can be made difficult. It is preferable that the spaces Δ1 and Δ2 be short because the mounting area of these components can be substantially reduced. The spaces Δ1 and Δ2 are sufficiently shorter than the lengths L1 to L3 of the respective parts.

  A space Δ1 ′ longer than the space Δ1 is provided between the upper portion of the main body 15a of the inductor 15 and the upper portion of the main body 16a of the capacitor 16. That is, the upper portion of the main body 16a of the capacitor 16 is disposed to be inclined in the positive direction of the X axis. A space Δ2 ′ smaller than the space Δ2 is provided between the upper portion of the main body 16 a of the capacitor 16 and the upper portion of the main body 18 a of the inductor 18. Preferably, the space Δ2 ′ is zero. In this case, the body 16 a of the capacitor 16 is in contact with the body 18 a of the adjacent inductor 18.

  The inductor 15, the capacitor 16 and the inductor 18 described above are disposed in this order on the first surface 12a of the substrate 12 in the positive direction of the X-axis. Also, on the first surface 12a, other large parts with relatively high height, for example, an electric field capacitor for the smoothing circuit 22 are mounted. In order to reduce the height after mounting, the electric field capacitor is mounted with the main body sideways. Other low-height rectifier circuits 20, resistors, capacitors and the like are also mounted on the second surface 12b.

  The length of the substrate 12 in the X-axis direction is the sum of the length L1 of the main body 15a of the inductor 15, the length L2 of the main body 16a of the capacitor 16 and the length L3 of the main body 18a of the inductor 18 It is roughly set by adding the length of

  The length (width) of the substrate 12 in the Y-axis direction is generally set by the widest of the width W1 of the main body 15a of the inductor 15, the width W2 of the main body 16a of the capacitor 16, and the width W3 of the main body 18a of the inductor 18. Be done.

  The length (height) of the switching power supply 10 in the Z-axis direction is the highest among the height H1 of the main body 15a of the inductor 15, the height H2 of the main body 16a of the capacitor 16, and the height H3 of the main body 18a of the inductor 18. It is generally set by the high ones.

  The capacitor 16 is a radial component in which the lead wires are used as the terminals 16b and 16c. Therefore, after mounting on the substrate 12, the upper portion of the main body 16a can be inclined in the X-axis direction. The height of the switching power supply 10 can be reduced by inclining the upper portion of the main body 16 a in the positive direction of the X axis.

  As described later, the external dimensions of the main body 15a of the inductor 15, the main body 16a of the capacitor 16, and the main body 18a of the inductor 18 are miniaturized by increasing the switching frequency of the switching power supply device 10. As described above, since the dimensions of the substrate 12 are set, the area of the substrate 12 can be reduced by increasing the switching frequency, and the switching power supply 10 can be miniaturized.

  As shown in FIG. 3, the switching power supply device 10 of the present embodiment includes a noise filter 14, a rectifier circuit 20, a smoothing circuit 22, and a DC-DC converter 30. The inductor 15 of the noise filter 14, together with the capacitor 16, suppresses the conduction of noise generated by the power conversion operation (switching operation as described later) of the switching power supply device 10 to the outside. One end of the inductor 15 is connected to one of the power supply input terminals 10a and 10b (in this example, the power supply input terminal 10a). The other end of the inductor 15 is connected to one end of the capacitor 16. That is, the inductor 15 is inserted in series in one of the power supply lines 2a and 2b. The other end of the capacitor 16 is connected to the power input terminal 10b. That is, the capacitor 16 is connected between the power supply lines 2a and 2b (between the lines). The noise filter 14 is an L-shaped normal mode noise filter. In the noise filter 14, a capacitor may be further connected between one end of the inductor 15 and the other end of the capacitor 16 to form a π-type normal mode noise filter. As in this example, a fuse may be inserted into one of the power supply lines 2a and 2b to protect the switching power supply 10.

  The rectifier circuit 20 includes input terminals 20a and 20b and output terminals 20c and 20d. The input terminals 20 a and 20 b of the rectifier circuit 20 are connected to the AC power supply 2 via the noise filter 14. The rectifier circuit 20 rectifies the AC voltage input to the input terminals 20a and 20b and outputs a pulsating current from the output terminals 20c and 20d. The output terminal 20c outputs a positive voltage to the output terminal 20d. The rectifier circuit 20 is, for example, a diode bridge. A rectifier circuit 20 composed of a diode bridge outputs a full-wave rectified pulsating current.

  The smoothing circuit 22 is connected to the output terminals 20 c and 20 d of the rectifier circuit 20. Smoothing circuit 22 is, for example, a smoothing capacitor. The smoothing circuit 22 receives the pulsating current voltage from the rectifying circuit 20 and converts it into a substantially constant DC voltage.

  The DC-DC converter 30 includes an output element 31, a constant current element 32, a rectifying element 33, an inductor 18, and a smoothing capacitor 34. The output element 31 and the constant current element 32 are connected in series. A series connected body of the output element 31 and the constant current element 32 is connected in series to the rectifying element 33 between the output terminals 20 c and 20 d of the rectifying circuit 20. One end of the inductor 18 is connected to a connection node n 1 of the series connection of the output element 31 and the constant current element 32 and the rectifying element 33. The other end of the inductor 18 is connected to the output terminal 10 c of the switching power supply device 10. Both ends of the smoothing capacitor 34 are connected to the output terminals 10 c and 10 d of the switching power supply 10 respectively.

  The output element 31 is a normally on switching element in this example. As the output element 31, for example, a high electron mobility transistor (HEMT) is used. For example, a wide band gap semiconductor can be used for the HEMT. The wide band gap semiconductor refers to, for example, gallium nitride (GaN) or silicon carbide (SiC) having a wider band gap than silicon.

  The constant current element 32 is a normally on type element in this example. As the constant current element 32, similarly to the output element 31, a HEMT using a wide band gap semiconductor can be used.

  A gate drive circuit is connected to the control terminal (gate) of the output element 31. The gate drive circuit includes a coupling capacitor 35, an auxiliary winding 37, a diode 38 and a resistor 39. One end of the coupling capacitor 35 is connected to the gate of the output element 31, and the other end is connected to one end of the auxiliary winding 37. The other end of the auxiliary winding 37 is connected to the connection node n1. The auxiliary winding 37 is an auxiliary winding of the inductor 18. That is, the auxiliary winding 37 is magnetically coupled to the main winding 36 and outputs a voltage according to the magnetic flux generated in the main winding 36. The diode 38 and the resistor 39 clamp between the gate and the source of the output element 31 so that a positive voltage is not applied to the gate of the output element 31 with respect to the source.

  A gate voltage control circuit is connected to the control terminal (gate) of the constant current element 32. The gate voltage setting circuit includes a diode 40, a constant voltage diode 41, a capacitor 42, resistors 43 to 46, a transistor 47, an operational amplifier 48, a capacitor 49, a reference voltage source 51, a resistor 52, including. The diode 40 clamps so that a positive voltage is not applied between the gate and the source of the constant current element 32 which is a normally-on type HEMT. The constant voltage diode 41 and the capacitor 42 together with the resistors 43 to 46 function as a low pass filter. Further, the resistors 43 and 45 divide the voltage of the connection node n1 in accordance with the output current of the transistor 47. The voltage divided by the resistors 43 and 45 is applied to the gate of the constant current element 32 through the resistor 44.

  Of the gate voltage control circuit, the resistor 46, the transistor 47, and the operational amplifier 48 constitute a differential amplifier circuit. The differential amplifier circuit amplifies and outputs a voltage difference between the reference voltage source 51 and the voltage across the resistor 52. That is, the gate voltage control circuit sets the gate voltage of the constant current element 32 so as to make the output current of the DC-DC converter 30 detected by the differential amplifier circuit constant.

  The DC-DC converter 30 including the above configuration converts the non-stable DC voltage rectified by the rectification circuit 20 and smoothed by the smoothing circuit 22 into a constant current and outputs it. The constant current value is set by the reference voltage source 51 and the resistor 52 in accordance with the current value flowing to the light emitting module 60. The DC-DC converter 30 operates in the critical mode, and the switching frequency is determined mainly by the inductance value of the inductor 18. The switching frequency is set to, for example, about 1 MHz.

  When the switching frequency of the DC-DC converter 30 is set high, the inductance value of the inductor 18 and the capacitance value of the smoothing capacitor 34 can be reduced, and the external dimensions of these components can be made smaller. Can. In addition, when the switching frequency of the DC-DC converter 30 is set high, the frequency of the conducted noise to be suppressed also becomes the switching frequency and its harmonic component, so the cutoff frequency of the noise filter 14 can be increased. Therefore, the external dimensions of the inductor 15 and the capacitor 16 that constitute the noise filter 14 can be reduced.

  The above-mentioned circuit example is shown as a circuit example of a DC-DC converter capable of high-frequency switching operation. For example, if it is a circuit of a DC-DC converter operating at a switching frequency of 500 kHz or more, a step-up type There may be other circuit configurations such as a buck-boost type or a transformer isolation type. Also, a power factor improvement circuit or the like may be added. The voltage waveform for driving the inductor 18 is not limited to a rectangular wave, and may be a sine wave or the like.

The operation of the switching power supply 10 of the present embodiment will be described.
In the switching power supply 10 of the present embodiment, the inductor 15, the capacitor 16 and the inductor 18 are disposed in this order in the positive direction of the X axis. The inductor 18 is driven at the switching frequency of the DC-DC converter 30 by the output element 31, the constant current element 32 and the rectifying element 33. A rectangular wave voltage is applied to both ends of the main winding 36 of the inductor 18, and a triangular wave current corresponding to the rectangular wave voltage flows. The switching frequency of the DC-DC converter 30 is set to 1 MHz or more. For example, when the switching frequency is 1 MHz, a rectangular wave voltage and a triangular wave current having a fundamental wave of 1 MHz are applied to the main winding 36 of the inductor 18 and flow. A rectangular wave voltage or the like having a fundamental wave of 1 MHz becomes normal mode noise and is conducted through the power supply lines 2a and 2b to which the AC power supply 2 is connected. The capacitor 16 whose both ends are connected to the pair of power supply lines 2a and 2b shorts the normal mode noise and suppresses the conduction of the normal mode noise to the AC power supply 2 side. The normal mode noise that is partially leaked to the side of the AC power supply 2 is attenuated by the inductor 15 and prevented from leaking to the outside.

  Since the main body 16a of the capacitor 16 is separated from the main body 15a of the inductor 15, it is difficult to cause electrostatic coupling or magnetic induction coupling according to the dielectric constant of the insulating material forming the main body 16a. Therefore, the normal mode noise flowing into the capacitor 16 is prevented from conducting to the side of the inductor 15.

  When the body 16a of the capacitor 16 is provided to be in contact with the body 18a of the inductor 18, the upper portion of the body 16a is inclined in the positive direction of the X axis. Therefore, it is ensured that a Δ1 ′ longer than the space Δ1 is formed between the body 16 a of the capacitor 16 and the body 15 a of the inductor 15.

  In the switching power supply device 10 of the present embodiment, when the inductor 15, the capacitor 16 and the inductor 18 are mounted on the substrate 12, the spaces Δ1 and Δ2 are provided. As shown in FIG. 4, after mounting these parts, a jig J having a length Lj in the X-axis direction of the tip longer than the space Δ1 between the main body 15a of the inductor 15 and the main body 16a of the capacitor 16 Is inserted. Since the terminals 16b and 16c of the capacitor 16 are provided along the Y axis, insertion of the jig J causes the upper portion of the main body 16a to fall to the side of the inductor 18 to secure a space Δ1 ′ (> Δ1). Ru. Preferably, the body 16 a of the capacitor 16 is in contact with the body 18 a of the inductor 18 to secure a space Δ1 ′. The inductor 15 and the capacitor 16 may not be in contact with each other by inserting a jig J having a length Lj in the X-axis direction smaller than Δ1 between the inductor 15 and the capacitor 16.

The operation and effects of the switching power supply device 10 of the present embodiment will be described.
In switching power supply 10 of the present embodiment, inductor 15, capacitor 16 and inductor 18 are disposed parallel to the X-axis direction so as to include spaces Δ1 and Δ2 between the lower portions of the respective bodies. 12 can be mounted at high density. Since a space Δ1 ′ longer than space Δ1 is provided between the upper portion of body 15a of inductor 15 and the upper portion of body 16a of capacitor 16, mutual capacitive coupling and magnetic coupling of inductor 15 and capacitor 16 are reduced can do. Therefore, the conduction of normal mode noise flowing through capacitor 16 to the side of inductor 15 can be prevented.

  The space Δ1 ′ can have a sufficient length by setting the space Δ2 ′ between the upper portion of the main body 16a of the capacitor 16 and the upper portion of the main body 18a of the inductor 18 to zero. The space Δ2 ′ can be realized by inserting a jig J between the main body 15 a of the inductor 15 and the main body 16 a of the capacitor 16 during the manufacturing process of the switching power supply device 10. It should be noted that, by bringing the space Δ2 ′ into 0, that is, by bringing the main body 16a of the capacitor 16 and the main body 18a of the inductor 18 into contact with each other, noise is not generated or other characteristics are not affected.

  The central axes C1 and C2 of the coils of the inductors 15 and 18 disposed in close proximity to each other are disposed substantially at right angles. Therefore, since the inductor 15 is hardly coupled to the magnetic field generated by the inductor 18 driven by high frequency switching by mutual induction, it is possible to suppress normal mode noise leaked to the power supply line.

  FIG. 5 shows the result of measuring the normal mode noise. In the upper part of FIG. 5, the measurement result when the main body 16a of the capacitor 16 is separated from the main body 15a of the inductor 15 of the noise filter 14 and the main body 16a of the capacitor 16 is brought into contact with the main body 18a of the inductor 18 to be switched is Show. The lower part of FIG. 5 shows the peak value of normal mode noise when the main body 16 a of the capacitor 16 is in contact with the main body 15 a of the inductor 15 of the noise filter 14. From the comparison of FIG. 5, an effect of noise reduction of approximately 6% to 10% is recognized at each measurement frequency.

Second Embodiment
FIG. 6A is a front view illustrating the appearance of the switching power supply device of the present embodiment, and FIG. 6B is a plan view illustrating the appearance of the switching power supply device of the present embodiment.
In the case of the first embodiment, the space Δ1 ′ is secured by inserting a jig between the main body 15a of the inductor 15 and the main body 16a of the capacitor 16. However, another method may be used. In the switching power supply device 110 of the present embodiment, the spacer 111 is provided between the main body 15 a of the inductor 15 and the main body 16 a of the capacitor 16. The spacer 111 is an insulating member such as a synthetic resin.

  The length of the tip of the spacer 111 in the X-axis direction is set longer than the space Δ1. The spacer 111 is inserted between the main body 15 a of the inductor 15 and the main body 16 a of the capacitor 16 with the tip directed in the negative direction of the Z axis. The spacer 111 may have a wedge shape which becomes longer in the positive direction of the Z axis as in this example.

  The spacer 111 is inserted into the above-mentioned place after the inductor 15, the capacitor 16 and the inductor 18 are mounted on the first surface 12 a of the substrate 12. The spacer 111 is inserted in the negative direction of the Z axis, whereby the upper portion of the main body 16 a of the capacitor 16 is inclined to the side of the inductor 18. For example, the spacer 111 is wedge-shaped, and is inserted in the above-mentioned place, and is fixed by the upper part of the main body 16a of the capacitor 16 contacting the main body 18a of the inductor 18. It may be fixed using an adhesive or the like.

  Spacer 111 is preferably an insulating material having a dielectric constant less than that of body 16 a of capacitor 16.

The operation and effects of the switching power supply device 110 of the present embodiment will be described.
The switching power supply 110 of this embodiment includes a spacer 111 provided between the main body 15 a of the inductor 15 and the main body 16 a of the capacitor 16. Since the spacer 111 has a tip length longer than the space Δ1 between the main body 15a of the inductor 15 and the main body 16a of the capacitor 16, a space of at least the space Δ1 can be secured. By forming the spacer 111 in a wedge shape, the main body 16 a of the capacitor 16 can be brought into contact with the main body 18 a of the inductor 18, and a space Δ1 ′ can be secured.

Third Embodiment
FIG. 7 is a partial cross-sectional view illustrating the lighting apparatus according to the present embodiment.
As shown in FIG. 7, the lighting fixture 1 of the present embodiment includes a switching power supply device 10, a light emitting module 60, a base 120, a housing 122, and a light transmission shield 124. The switching power supply 10 is housed in the lighting apparatus 1.

  The base 120 accommodates part of the switching power supply 10 and connects the power input terminals 10 a and 10 b of the switching power supply 10 to the external AC power supply 2. The base 120 is a base in the light bulb-shaped lighting device 1.

  The housing 122 is formed of, for example, a metal containing aluminum, and houses the switching power supply 10 and the light emitting module 60 together with the base 120. The housing 122 is thermally coupled to the substrate 12 of the switching power supply device 10 and the light emitting module 60 to function as a heat sink for efficiently dissipating the heat generated by these.

  The translucent shield 124 transmits the light emitted from the light emitting element 61 provided on the light emitting module 60 and protects the light emitting module 60.

The operation and effects of the lighting fixture 1 of the present embodiment will be described.
In the lighting fixture 1 of the present embodiment, the above-described switching power supply 10 is capable of high-frequency switching operation, so the external size of the components such as the inductors 15 and 18 and the capacitor 16 can be reduced. Therefore, since it can be stored in the base portion (base 120) of the light bulb-shaped lighting fixture 1, the lighting fixture 1 can be miniaturized as well, and the degree of freedom in design can be taken large.

  According to the embodiment described above, it is possible to realize the power supply device and the lighting device in which the coupling between the inductor for power conversion and the inductor for suppressing noise is suppressed.

  While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the scope of equivalents thereof. In addition, the embodiments described above can be implemented in combination with each other.

  DESCRIPTION OF SYMBOLS 1 luminaire, 2 alternating current power supply, 10 switching power supply devices, 12 board | substrates, 12a 1st surface, 12b 2nd surface, 14 noise filter, 15 inductors, 16 capacitors, 18 inductors, 20 rectification circuits, 22 smoothing circuits, 30 DC- DC converter, 31 output elements, 32 constant current elements, 33 rectifying elements, 34 smoothing capacitors, 35 coupling capacitors, 36 main windings, 37 auxiliary windings, 38, 40 diodes, 39 resistors, 41 constant voltage diodes, 42 capacitors , 43 to 46 resistors, 47 transistors, 48 operational amplifiers, 49 capacitors, 51 reference voltage sources, 52 resistors, 60 light emitting modules, 61 light emitting elements, 110 switching power supplies, 111 spacers

Claims (5)

A substrate having a first surface,
A first inductor including an insulating body provided on the first surface and connected in series to one of the power supply lines;
A second inductor that includes an insulating body provided on the first surface and is switch-driven by a switching element;
A capacitor connected between the power supply lines, including an insulating body provided adjacent to each other between the body of the first inductor and the body of the second inductor on the first surface;
Equipped with
The power supply device, wherein a main body of the capacitor is disposed apart from a main body of the first inductor and is in contact with a main body of the second inductor . A main body of the capacitor, further comprising Claim 1 Symbol mounting power supply insulating member provided between the body of the first inductor. The first inductor, the capacitor, and the second inductor are disposed along a first direction,
The capacitor includes connection terminals at both ends of the body of the capacitor,
Connection terminals of the capacitor, the power supply device according to claim 1 or 2 is provided along a second direction crossing the first direction on the first surface. The power supply device according to claim 3 , wherein a central axis of a coil of the first inductor is disposed to be orthogonal to a central axis of a coil of the second inductor. The power supply device according to any one of claims 1 to 4 .
A lighting load connected to the output of the power supply;
Lighting fixtures.

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