JP7178584B2 - Power supplies, lighting devices, and lighting fixtures - Google Patents

Description

The present disclosure relates to power supply devices, lighting devices, and lighting fixtures. More specifically, the present invention relates to a power supply device having a component that emits radiation noise, a lighting device having the power supply device, and a lighting fixture having the lighting device.

As a conventional example, the lighting device described in Patent Document 1 will be exemplified. The lighting device described in Patent Document 1 includes a line filter, a rectifier circuit, a flyback circuit, and a buck converter circuit. A flyback circuit includes a transformer having a primary winding electrically connected between output terminals of a rectifier circuit, and a switching element that interrupts current flowing through the primary winding of the transformer.

JP 2017-97960 A

By the way, in a circuit (flyback circuit) having a transformer and a switching element as in the conventional example, the noise radiated from the transformer by the switching of the switching element is transmitted to the outside (such as the electric power system to which the lighting device of the conventional example is connected). ) may leak. Methods for reducing noise leaking to the outside include a method of increasing the distance between a noise source (for example, a transformer) and an input terminal, or a method of covering a noise source with a conductor (such as a metal plate). However, the above method has disadvantages such as difficulty in miniaturizing the lighting device.

An object of the present disclosure is to provide a power supply device, a lighting device, and a lighting fixture capable of reducing noise leaking to the outside and miniaturizing the device.

A power supply device according to an aspect of the present disclosure includes an input terminal section electrically connected to an external power supply, and a filter circuit electrically connected to the input terminal section. The power supply device has a power conversion circuit that converts power input from the external power supply through the filter circuit, an electrical conductor and an electrical insulator that covers the conductor, and a ground wire to connect the protective conductor and the electrical conductor. and circuit components that are physically connected to each other . The circuit component is arranged in a space between the filter circuit and the power conversion circuit , is positioned closer to the filter circuit than the power conversion circuit, and is positioned next to the filter circuit.

A lighting device according to an aspect of the present disclosure includes the power supply device. The lighting device supplies power from the power supply device to a light source, which is a load, to light the light source.

A lighting fixture according to an aspect of the present disclosure includes the lighting device, a light source that is lit by the lighting device, and a fixture body that holds at least the light source.

The power supply device, the lighting device, and the lighting fixture according to the present disclosure have the effect of reducing noise leaking to the outside and miniaturizing the device.

FIG. 1 is a circuit diagram of a power supply device (lighting device) according to an embodiment of the present disclosure. FIG. 2 is a plan view of the power supply device (lighting device) of the same. FIG. 3 is a perspective view of the same power supply device (lighting device). FIG. 4 is a cross-sectional perspective view of a metal plate resistor which is a circuit component of the power supply device (lighting device) of the same. FIG. 5A is a partial cross-sectional view of a varistor that is a circuit component of the power supply device (lighting device) of the same. FIG. 5B is a side cross-sectional view of the same varistor. FIG. 6A is a partial cross-sectional view of a ceramic capacitor that is a circuit component of the power supply device (lighting device) of the same. FIG. 6B is a side cross-sectional view of the same ceramic capacitor. FIG. 7A is a front view of an inductor that is a circuit component of the power supply device (lighting device); FIG. 7B is a side view of the same inductor. 8 is a perspective view of a lighting fixture according to an embodiment of the present disclosure; FIG.

Each drawing described in the following embodiments is a schematic drawing, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to design and the like as long as the effects of the present disclosure can be achieved.

The power supply device 1 according to the embodiment has a light source as a load. That is, the power supply device 1 is an embodiment of a lighting device having a light source as a load. However, the load of the power supply device according to the embodiment of the present disclosure is not limited to the light source. For example, the load of the power supply device according to the embodiment of the present disclosure includes all circuits that require a DC power supply, such as a charging circuit that charges a secondary battery and a drive circuit that drives a motor.

A light source, which is a load of the power supply device 1, is an LED module 2, as shown in FIG. The LED module 2 is preferably configured by electrically connecting a plurality of white LEDs (Light Emitting Diodes) for illumination in series or series-parallel. However, the light source is not limited to the LED module 2, and may be a solid light source such as an organic electroluminescence element or a laser diode.

As shown in FIG. 1, the power supply device 1 includes an input terminal portion 10 electrically connected to an external power source 9, a filter circuit 11 electrically connected to the input terminal portion 10, and a filter circuit 11 connected to the external power source 9. and a power conversion circuit 13 for power conversion of the power input through 11 . The external power supply 9 is, for example, a commercial AC power supply. Therefore, the external power supply 9 supplies AC power with a power supply voltage of 100 V or 200 V (effective value) and a power supply frequency of 50 Hz or 60 Hz to the power supply device 1 .

The input terminal section 10 has a first input terminal 101 and a second input terminal 102 . The first input terminal 101 is electrically connected to the positive electrode of the external power source 9 by a power wire made of a covered wire. The second input terminal 102 is electrically connected to the negative electrode of the external power source 9 by a power wire made of a covered wire. The first input terminal 101 and the second input terminal 102 may be screw terminals or screwless terminals, or may be lands formed on a circuit board 16 to be described later.

The filter circuit 11 has a common mode choke coil 110 and a line bypass capacitor C1. A first end of the line bypass capacitor C1 is electrically connected to the first input terminal 101 through a first fuse F1. Also, the second end of the line bypass capacitor C1 is electrically connected to the second input terminal 102 through the second fuse F2. Furthermore, a surge protection element ZNR1 such as a varistor is electrically connected in parallel with the line bypass capacitor C1.

Common mode choke coil 110 has two input terminals and two output terminals. The two input terminals are electrically connected one by one to the first and second ends of the line bypass capacitor C1. The two output terminals are electrically connected to the two AC input terminals of the rectifier circuit 12 one by one. A series circuit of two surge protection elements ZNR3 and ZNR4 and one surge protection element ZNR2 are electrically connected in parallel to the two output terminals. Furthermore, the connection point of the two surge protection elements ZNR3 and ZNR4 is electrically connected to a protective earth terminal (PE: protective earth) 17 via a surge protection element ZNR5. In addition, the protective ground terminal 17 is electrically connected to a protective conductor (for example, the device main body 4 to be described later) by a ground wire. Therefore, the potential of the protective ground terminal 17 can be regarded as a stable potential (stable potential).

Rectifier circuit 12 is a diode bridge. An AC voltage supplied from an external power supply 9 is input between two AC input terminals of the rectifier circuit 12 . A full-wave rectified pulsating voltage is output from two pulsating current output terminals of the rectifier circuit 12 .

The power conversion circuit 13 is a step-up/step-down chopper circuit (buck-boost converter circuit). The power conversion circuit 13 has a switching element Q1, a transformer 130, a diode D1, an input capacitor C2 and an output capacitor C3. The input capacitor C2 is electrically connected between the two pulsating current output terminals of the rectifier circuit 12 . The switching element Q1 is, for example, an enhancement-type N-channel MOSFET (metal-oxide-semiconductor field-effect transistor). However, the switching element Q1 may be a power transistor other than a MOSFET, such as a bipolar transistor. The drain of the switching element Q1 is electrically connected to the pulsating output terminal of the rectifier circuit 12 on the high potential side. The source of switching element Q1 is electrically connected to the cathode of diode D1.

A first end of the primary winding 131 of the transformer 130 is electrically connected to the source of the switching element Q1, and a second end of the primary winding 131 is electrically connected to the pulsating output terminal of the rectifier circuit 12 on the low potential side. It is A secondary winding 132 of transformer 130 is electrically connected to control circuit 14 .

The anode of diode D1 is electrically connected to the low potential side terminal of output capacitor C3. The output capacitor C3 is, for example, a smoothing capacitor made up of an electrolytic capacitor. The high potential side terminal of the output capacitor C3 is electrically connected to the second end of the primary winding 131 of the transformer 130 and the positive electrode 20 of the LED module 2 . The terminal on the low potential side of the output capacitor C3 is electrically connected to the negative electrode 21 of the LED module 2 via the detection resistor R1.

The control circuit 14 is, for example, an integrated circuit for driving a power transistor. Control circuit 14 operates by an induced electromotive force induced in secondary winding 132 of transformer 130 . The control circuit 14 outputs a high-level drive signal between the gate and source of the switching element Q1. The switching element Q1 is turned on only while the drive signal is being output, that is, while the potential difference between the gate and the source is greater than or equal to the threshold voltage of the switching element Q1. The switching element Q1 is turned off when the drive signal is not output, that is, when the potential difference between the gate and the source is less than the threshold voltage.

The control circuit 14 turns on the switching element Q1 at regular intervals by setting the drive signal to high level at regular intervals. Further, the control circuit 14 adjusts the timing of turning off the switching element Q1 according to the voltage across the detection resistor R1. That is, the lower the voltage across the detection resistor R1, the later the timing for turning off the switching element Q1, and the higher the voltage across the detection resistor R1, the earlier the timing for turning off the switching element Q1. That is, the control circuit 14 switches the switching element Q1 so that the output current of the power conversion circuit 13 is constant.

Circuit component 15 is, for example, a metal plate resistor. Both ends of the circuit component 15 are electrically connected to terminals on the high potential side of the output capacitor C3 of the power conversion circuit 13 . However, the resistance value of the circuit component 15 is sufficiently larger than the resistance value of the conductor that electrically connects the high potential side terminal of the output capacitor C3 and the second end of the primary winding 131 of the transformer 130 . Therefore, of the current flowing from the second end of the primary winding 131 of the transformer 130 to the output capacitor C3 and the positive electrode 20 of the LED module 2, the current flowing to the circuit component 15 can be regarded as substantially zero.

The power supply device 1 has one rectangular circuit board 16, as shown in FIGS. The circuit board 16 is, for example, a printed wiring board in which printed wiring is formed on a glass cloth base epoxy resin substrate. One side of the circuit board 16 serves as a component mounting surface 160 . However, the circuit board 16 may be formed of an insulating substrate other than the glass cloth base epoxy resin substrate. Also, the circuit board 16 may be a double-sided mounting board. Note that the power supply device 1 may have a plurality of circuit boards.

In the following description, the front-rear, left-right, and up-down directions indicated by arrows in FIG. Therefore, the upper surface of the circuit board 16 becomes the component mounting surface 160 . The printed wiring is formed on both the upper surface (component mounting surface 160) and the lower surface of the circuit board 16. FIG.

A first input terminal 101, a second input terminal 102, and a protective ground terminal 17 are provided at the left front end of the circuit board 16 (see FIGS. 2 and 3). The first input terminal 101, the second input terminal 102, and the protective ground terminal 17 are formed by through-hole plating and land.

Transformer 130 of power conversion circuit 13 is mounted approximately in the center of component mounting surface 160 of circuit board 16 (see FIG. 2). An output capacitor C3, a diode D1, and the like, which form the power conversion circuit 13 including the transformer 130, are mounted on the area on the right side from the center of the component mounting surface 160 (see FIGS. 2 and 3). However, the output capacitor C3 is actually composed of two electrolytic capacitors. Diode D1 is actually composed of three diodes (see FIG. 2).

On the other hand, the filter circuit 11 and the like are mounted on the area left from the center of the component mounting surface 160 . The common mode choke coil 110 of the filter circuit 11 is mounted at the center of the component mounting surface 160 in the front-rear direction in the left region of the component mounting surface 160 (see FIGS. 2 and 3). That is, common mode choke coil 110 is arranged adjacent to transformer 130 along the longitudinal direction (horizontal direction) of component mounting surface 160 . A circuit component 15 is mounted between the common mode choke coil 110 and the transformer 130 .

As shown in FIG. 4, the circuit component 15 includes a resistor (conductor) 150 formed in an S-shape, two leads 151 protruding from the resistor 150, and an electrical insulator 152 covering the resistor 150. , and a case 153 housing a resistor 150 and an electrical insulator 152 . The resistor 150 is, for example, a metal plate. Electrical insulator 152 is, for example, cement. The electrical insulator 152 is formed in a rectangular parallelepiped shape so as to wrap the resistor 150 . The case 153 is made of ceramics, has a rectangular parallelepiped shape, and accommodates the electrical insulator 152 .

Here, the inventors of the present invention found that the noise ( It was found that the noise terminal voltage) decreased by about 2 to 3 dB.

If the circuit component 15 is not mounted between the common mode choke coil 110 and the transformer 130 , radiation noise (electromagnetic waves) radiated from the power conversion circuit 13 interlinks with the common mode choke coil 110 . It is presumed that the greater the amount of interlinked radiation noise, the greater the induced electromotive force generated in the common mode choke coil 110 . It is considered that the noise terminal voltage rises because the induced electromotive force disrupts the balance between the currents flowing in the forward and backward paths of the common mode choke coil 110 .

On the other hand, if the distance between the power conversion circuit 13 and the common mode choke coil 110 on the component mounting surface 160 is increased, the induced electromotive force generated in the common mode choke coil 110 due to radiation noise is reduced, and the noise is reduced. Terminal voltage can be lowered. However, it is very difficult to increase the distance between the power conversion circuit 13 and the common mode choke coil 110 without increasing the size of the circuit board 16 . In the power conversion circuit 13, the transformer 130 is presumed to be the component that emits the largest amount of radiation noise.

Therefore, by arranging the circuit component 15 between the common mode choke coil 110 and the transformer 130 , part of the propagation path of the radiation noise from the transformer 130 to the common mode choke coil 110 is transferred to the circuit component 15 . It is interrupted by a conductor (resistor 150). Therefore, the radiation noise interlinking with the common mode choke coil 110 is reduced. That is, when the distance between the power conversion circuit 13 and the common mode choke coil 110 is increased due to the presence of the conductor (resistor 150 of the circuit component 15) between the common mode choke coil 110 and the transformer 130, be in the same situation. In particular, since the conductor (resistor 150) of the circuit component 15 is covered with the electrical insulator 152, the need to consider the insulation distance between the circuit component 15 and the common mode choke coil 110 and the transformer 130 is reduced. . As a result, when the circuit component 15 is mounted between the common mode choke coil 110 and the transformer 130, the noise terminal voltage of the power supply 1 is expected to drop by 2 to 3 dB compared to when the circuit component 15 is not mounted. be done. However, it is desirable that the conductor (resistor 150) of the circuit component 15 has the same potential as the stable potential. The circuit component 15 is preferably mounted on the component mounting surface 160 with the pair of leads 151 arranged in the front-rear direction of the power supply device 1 . When the circuit component 15 is mounted on the component mounting surface 160 as described above, the area of the resistor 150 becomes the largest when viewed from the direction in which the common mode choke coil 110 and the transformer 130 are arranged (horizontal direction). As a result, the propagation path of the radiation noise blocked by the resistor 150 can be enlarged, and the noise terminal voltage can be further reduced.

Moreover, it is preferable that the circuit component 15 be arranged at a position closer to the filter circuit 11 (common mode choke coil 110 ) than to the power conversion circuit 13 . In other words, it is considered that the closer the circuit component 15 is located to the common mode choke coil 110, the larger the propagation path blocked by the conductor (resistor 150) (the interlinked radiation noise is reduced). Therefore, by arranging the circuit component 15 at a position closer to the common mode choke coil 110 than to the power conversion circuit 13, it is possible to further reduce the noise terminal voltage.

Furthermore, the circuit component 15 has leads 151 for electrical connection. Therefore, by inserting and mounting the circuit component 15 on the component mounting surface 160 of the circuit board 16, the circuit component 15 is placed between the power conversion circuit 13 (transformer 130) and the filter circuit 11 (common mode choke coil 110). Easy to deploy. Therefore, simplification of the assembly work of the power supply device 1 can be achieved.

By the way, circuit component 15 is not limited to a metal plate resistor. For example, circuit component 15 may be a varistor. As shown in FIGS. 5A and 5B, the varistor (circuit component 15) includes a disk-shaped varistor element 154, electrodes 155 (conductors) formed on both sides of the varistor element 154, a pair of leads 151, and a varistor. It has an exterior 156 that covers the element 154 and the electrode 155 . Each of electrodes 155 formed on both front and back surfaces of varistor element 154 is electrically connected to a pair of leads 151 one by one. Note that the sheath 156 is made of a synthetic resin material having electrical insulation such as epoxy resin.

Alternatively, circuit component 15 may be a ceramic capacitor. As shown in FIGS. 6A and 6B, the ceramic capacitor (circuit component 15) includes a disk-shaped dielectric 157, electrodes 155 (conductors) formed on both front and back surfaces of the dielectric 157, a pair of leads 151, It has a dielectric 157 and a sheath 156 covering the electrode 155 . Each of electrodes 155 formed on both front and back surfaces of dielectric 157 is electrically connected to a pair of leads 151 one by one.

Further, circuit component 15 may be an inductor. As shown in FIGS. 7A and 7B, the inductor (circuit component 15) has a coil (conductor) housed in a cylindrical case 158 (insulator) and has two leads 151 protruding from the case 158. FIG. Alternatively, the circuit component 15 may be a film capacitor, a metal oxide film resistor, a current fuse, or the like.

In experiments by the present inventors, the noise terminal voltage of the power supply 1 was reduced by 2 to 3 dB even in circuit components 15 (varistors, ceramic capacitors, inductors, film capacitors, metal oxide film resistors, and current fuses) other than metal plate resistors. It has been confirmed that the degree can be reduced.

Next, the lighting fixture 3 according to the embodiment of the present disclosure will be described. As shown in FIG. 8, the lighting fixture 3 is a road lighting fixture attached to a lighting pole (lighting pole) or the like arranged along the road or a street lighting fixture. However, the lighting fixture 3 is not limited to a road lighting fixture and a street lighting fixture. The lighting fixture 3 may be an outdoor lighting fixture other than a road lighting fixture and a street lighting fixture, or may be an indoor lighting fixture.

The lighting fixture 3 includes a power supply device (lighting device) 1, a light source (LED module 2), a fixture body 4, a frame 5, and a translucent panel 6 (see FIG. 8). The fixture body 4 is formed in a box shape having an opening, and accommodates the LED module 2 so as to face the opening.

The device main body 4 has a first housing portion 41 and a second housing portion 42 . The first accommodating portion 41 and the second accommodating portion 42 are integrally formed by aluminum die casting. The first housing portion 41 is formed in a box shape. A portion of the lower surface of the first housing portion 41 is open. The power supply device (lighting device) 1, a terminal block, and the like are accommodated in the first accommodation portion 41 .

The second housing portion 42 is formed in a rectangular box shape having an opening on the bottom surface. The second housing portion 42 is formed integrally with the first housing portion 41 so as to surround a portion of the opening of the lower surface of the first housing portion 41 . The LED module 2 is accommodated in the second accommodation portion 42 .

The translucent panel 6 is composed of a rectangular flat glass plate. The frame 5 has a rectangular frame main body 50 having a rectangular window 500 in the center, and a peripheral wall 51 protruding upward from the peripheral edge of the frame main body 50 over the entire circumference. The frame main body 50 and the peripheral wall 51 are integrally formed by aluminum die casting. The frame 5 is attached to the device main body 4 so that the translucent panel 6 is housed inside the peripheral wall 51 and the peripheral wall 51 is inserted into the second accommodation portion 42 (see FIG. 8). The frame 5 is fixed to the instrument body 4 with six fixing screws 52 .

The fixture 7 protrudes from the rear end of the instrument main body 4 (the rear end of the first housing portion 41) (see FIG. 8). The fixture 7 is an adapter for attaching the fixture body 4 to the arm of a linear lighting pole. The fixture 7 is formed in a cylindrical shape with a bottom by aluminum die casting, and is configured to accommodate the arm of the linear lighting pole inside. A plurality of fixing bolts 70 are attached to the peripheral surface of the fixture 7 . In other words, by tightening these bolts 70, the fixture 7 is retained from the arm, and the tool main body 4 is attached to the arm.

By including the power supply device (lighting device) 1 according to the embodiment, the lighting fixture 3 according to the embodiment can reduce noise (noise terminal voltage) leaking to the outside and can be miniaturized.

As described above, the power supply device (1) according to the first aspect includes an input terminal portion (10) electrically connected to an external power source (9), and an input terminal portion (10) electrically connected to the input terminal portion (10). and a filter circuit (11). A power supply device (1) according to a first aspect includes a power conversion circuit (13) that converts power input from an external power supply (9) through a filter circuit (11). A power supply device (1) according to a first aspect includes a circuit component (15) having an electrical conductor (resistor 150; electrode 155) and an electrical insulator covering the conductor (electrical insulator 152; sheath 156) Prepare. A circuit component (15) is placed in the space between the filter circuit (11) and the power conversion circuit (13).

In the power supply device (1) according to the first aspect, the conductor of the circuit component (15) partially blocks the propagation path of the radiation noise from the power conversion circuit (13) to the filter circuit (11). It is possible to reduce leakage noise (noise terminal voltage) and reduce the size.

A power supply device (1) according to the second aspect can be realized by a combination with the first aspect. In the power supply device (1) according to the second aspect, it is preferable that the circuit component (15) is electrically connected to the stable potential of the power conversion circuit (13).

In the power supply device (1) according to the second aspect, the potential of the conductor of the circuit component (15) becomes the same potential as the stable potential, so noise can be further reduced.

A power supply device (1) according to the third aspect can be realized by a combination with the first or second aspect. In the power supply device (1) according to the third aspect, the circuit component (15) is preferably arranged closer to the filter circuit (11) than the power conversion circuit (13).

In the power supply device (1) according to the third aspect, the closer the circuit component (15) is located to the filter circuit (11), the larger the propagation path blocked by the conductor, so that noise can be further reduced. can be done.

A power supply device (1) according to the fourth aspect can be realized by a combination with any one of the first to third aspects. In the power supply device (1) according to the fourth aspect, the circuit component (15) preferably has one or more leads (151) electrically connected to the conductor and protruding from the insulator.

In the power supply device (1) according to the fourth aspect, the conductors of the circuit component (15) can be easily electrically connected to conductors outside the circuit component (15) by the leads (151).

A power supply device (1) according to the fifth aspect can be realized by a combination with the fourth aspect. The power supply device (1) according to the fifth aspect preferably includes a circuit board (16) on which at least the filter circuit (11) and the power conversion circuit (13) are formed. The circuit component (15) is preferably inserted and mounted on the component mounting surface (160) of the circuit board (16) via one or more leads (151).

In the power supply device (1) according to the fifth aspect, when the circuit component (15) is inserted and mounted on the component mounting surface (160) of the circuit board (16) by the lead (151), the circuit board (16) is The circuit component (15) can be easily fixed by

A power supply device (1) according to the sixth aspect can be realized by a combination with any one of the first to fifth aspects. In the power supply device (1) according to the sixth aspect, the circuit component (15) is preferably a metal plate resistor having a metal plate (resistor 150) that is a conductor.

In the power supply device (1) according to the sixth aspect, if the circuit component (15) is a metal plate resistor, the area of the conductor can be increased to further reduce noise.

A power supply device (1) according to the seventh aspect can be realized by a combination with any one of the first to sixth aspects. In the power supply device (1) according to the seventh aspect, it is preferable that the power conversion circuit (13) includes a first circuit element (transformer 130) having an inductance. The filter circuit (11) preferably comprises a second circuit element (common mode choke coil 110) having an inductance. A circuit component (15) is preferably located in the space between the first circuit element and the second circuit element.

In the power supply device (1) according to the seventh aspect, part of the propagation path of noise (noise terminal voltage) leaking from the first circuit element, which is the source of radiation noise, to the second circuit element, which is the noise source can be interrupted by the conductors of the circuit component (15). As a result, the power supply device (1) according to the seventh aspect can further reduce noise.

A lighting device (1) according to an eighth aspect includes the power supply device (1) according to any one of the first to seventh aspects. A lighting device (1) according to an eighth aspect supplies power from a power supply device (1) to a light source (LED module 2) as a load to light the light source.

The lighting device (1) according to the eighth aspect can achieve reduction in noise (noise terminal voltage) leaking to the outside and miniaturization.

A lighting fixture (3) according to a ninth aspect comprises the lighting device (1) according to the eighth aspect, a light source that is lit by the lighting device (1), and a fixture body (4) that holds at least the light source. Prepare.

The luminaire (3) according to the ninth aspect can reduce noise (noise terminal voltage) leaking to the outside and can be miniaturized.

1 power supply (lighting device)
2 LED module (load; light source)
3 lighting fixture 4 fixture main body 9 external power supply 10 input terminal section 11 filter circuit 13 power conversion circuit 15 circuit component 16 circuit board 110 common mode choke coil (second circuit element)
130 transformer (first circuit element)
150 resistor (conductor)
151 lead 152 electrical insulator (electrical insulator)
155 electrode (conductor)
156 Exterior (electrical insulator)
160 Component mounting surface

Claims (8)

an input terminal portion electrically connected to an external power supply;
a filter circuit electrically connected to the input terminal portion;
a power conversion circuit that converts power input from the external power supply through the filter circuit;
a circuit component having an electrical conductor and an electrical insulator covering the conductor and electrically connected to the protective conductor by a ground wire ;
with
The power supply device, wherein the circuit component is arranged in a space between the filter circuit and the power conversion circuit, is positioned closer to the filter circuit than the power conversion circuit, and is positioned next to the filter circuit. . The circuit component has one or more leads electrically connected to the conductor and protruding from the insulator,
The power supply device according to claim 1 . A circuit board on which at least the filter circuit and the power conversion circuit are formed,
The circuit component is inserted and mounted on the component mounting surface of the circuit board by means of the one or more leads.
3. The power supply device according to claim 2 . The circuit component is a metal plate resistor having a metal plate as the conductor,
The power supply device according to any one of claims 1 to 3 . The circuit component includes a disk-shaped dielectric, a pair of electrodes formed on both sides of the dielectric, which is the conductor, and a pair of leads electrically connected to the pair of electrodes one by one. 4. The power supply device according to any one of claims 1 to 3, wherein the power supply device is a ceramic capacitor having an exterior covering the dielectric and the pair of electrodes . The power conversion circuit comprises a first circuit element having an inductance,
The filter circuit comprises a second circuit element having an inductance,
6. The power supply device according to claim 1, wherein said circuit component is arranged in a space between said first circuit element and said second circuit element. A power supply device according to any one of claims 1 to 6 ,
Power is supplied from the power supply device to a light source, which is a load, to turn on the light source;
lighting device. a lighting device according to claim 7 ;
a light source that is lit by the lighting device;
a fixture body that holds at least the light source;
comprising
lighting equipment .

Images