JP7584075B2 - Power supply devices, lighting devices and lighting fixtures - Google Patents

Description

The present disclosure relates to a power supply device, a lighting device, and a lighting fixture. More specifically, the present disclosure relates to a power supply device having a filter circuit, a lighting device having the power supply device and a light source that is a load, and a lighting fixture having the lighting device.

As a conventional example of a power supply device, the halogen lamp lighting device described in Patent Document 1 is exemplified. The halogen lamp lighting device described in Patent Document 1 has a noise elimination device, a rectifier circuit, and an inverter circuit. The noise elimination device has an across capacitor, a normal mode choke, and a common mode choke. The across capacitor connects a pair of voltage input terminals. The normal mode choke has one end connected to one of the voltage input terminals. The common mode choke has a first inductor and a second inductor that are magnetically coupled to each other. The first inductor connects the other end of the normal mode choke to a voltage output terminal. The second inductor connects the pair of voltage input terminals.

The noise removal device prevents high-frequency noise from entering the halogen lamp lighting device through the power line from the commercial power source, and also prevents high-frequency noise generated by the halogen lamp lighting device from escaping to the outside through the power line.

In addition, in the halogen lamp lighting device described in Patent Document 1, an AC voltage that is phase-controlled by a phase control dimmer device is input.

JP 2008-210597 A

However, when a phase-controlled AC voltage is input to a halogen lamp lighting device (power supply), a sudden current flows through the normal mode choke coil of the noise elimination device. As a result, the normal mode choke coil may vibrate and generate abnormal noise.

The objective of this disclosure is to provide a power supply device, a lighting device, and a lighting fixture that can suppress noise caused by vibration of a choke coil.

A power supply device according to one aspect of the present disclosure includes a pair of power supply terminals, a conversion circuit that converts an AC voltage input from the pair of power supply terminals into a DC voltage, a filter circuit provided between the pair of power supply terminals and the conversion circuit, and a printed wiring board on which the filter circuit is mounted. The filter circuit has two choke coils with equal inductance. Each of the two choke coils is a non-shielded type (open magnetic circuit type) radial lead type drum inductor, and is inserted in a path of current flowing from the pair of power supply terminals to the conversion circuit. The two choke coils are configured so that the magnetic fluxes generated when the current flows are in opposite directions. On the component side of the printed wiring board, the two choke coils are mounted close to each other at a distance shorter than the outer diameter of the choke coils.

The lighting device according to one aspect of the present disclosure has the power supply device and a light source that is illuminated by DC power supplied from the power supply device.

A lighting fixture according to one aspect of the present disclosure has the lighting device and a fixture body that supports at least the light source.

The power supply device, lighting device, and lighting fixture disclosed herein have the effect of suppressing noise caused by vibration of the choke coil.

FIG. 1 is a circuit configuration diagram of a power supply device and a lighting device according to an embodiment of the present disclosure. FIG. 2 is a front view of the power supply device with a portion of the printed wiring board omitted. FIG. 3 is a perspective view of a lighting fixture according to an embodiment of the present disclosure. 4A and 4B are graphs showing the results of measurement of noise in a comparative example of the power supply device of the same embodiment; FIG. 5 is a partially omitted circuit diagram showing a first modification of the power supply device. FIG. 6 is a partially omitted circuit diagram showing a second modification of the power supply device. FIG. 7 is a partially omitted circuit diagram showing a third modification of the power supply device.

The power supply device, lighting device, and lighting fixture according to the embodiments of the present disclosure will be described in detail with reference to the drawings. However, each figure described in the following embodiments is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configuration described in the following embodiment is merely one example of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

(1. Configuration of the lighting device according to the embodiment)
As shown in FIG. 1 , an illumination device 3 according to an embodiment (hereinafter, abbreviated as illumination device 3) includes an LED (Light Emitting Diode) 2 as a light source, and a power supply device 1 (power supply device 1 according to an embodiment) that supplies DC power to light up the LED 2.

The LED 2 is, for example, a chip-on-board type white LED for illumination. However, the LED 2 may be a packaged type white LED for illumination. The lighting device 3 may also include a plurality of LEDs 2. It is preferable that the plurality of LEDs 2 are electrically connected in series or electrically connected in series-parallel. The light source may be a solid-state light source other than the LED 2, for example, an organic electroluminescence element.

(2. Configuration of the power supply device according to the embodiment)
As shown in FIG. 1 , a power supply device 1 according to an embodiment (hereinafter, abbreviated as power supply device 1) includes a pair of power supply terminals 10, a conversion circuit 11, a filter circuit 12, a rectifier circuit 13, a control circuit 15, and a pair of output terminals.

The pair of power supply terminals 10 consists of a first power supply terminal 10A and a second power supply terminal 10B. The first power supply terminal 10A is electrically connected to the positive pole of the AC power supply 8 via the dimmer 9. The second power supply terminal 10B is electrically connected to the negative pole of the AC power supply 8.

The dimmer 9 uses, for example, a bidirectional three-terminal thyristor (also called a triac) to phase-control the AC voltage supplied from the AC power source 8 to the power supply device 1. The dimmer 9 has, for example, a rotary operation handle, and controls the phase of the AC voltage at a phase angle according to the rotation angle of the operation handle from a reference position. Alternatively, the dimmer 9 may have a sliding operation handle, and control the phase of the AC voltage at a phase angle according to the movement distance of the operation handle from a reference position. The rotation angle (for example, any angle between 0° and 300°) or movement distance of the operation handle is in one-to-one correspondence with the dimming level of the LED2. The dimming level represents the ratio of the current flowing through the LED2 when the light amount when the rated current flows through the LED2 is set to 100%.

The pair of output terminals consists of a first output terminal 14A and a second output terminal 14B. The first output terminal 14A is electrically connected to the anode of LED2. The second output terminal 14B is electrically connected to the cathode of LED2.

The filter circuit 12 has one capacitor C1 and two choke coils (a first choke coil L1 and a second choke coil L2). The capacitor C1 is also called an X capacitor. The capacitor C1 can suppress normal mode (differential mode) noise by bypassing the first power supply terminal 10A and the second power supply terminal 10B. The first end (start of winding) of the first choke coil L1 is electrically connected to the first power supply terminal 10A, and the second end (end of winding) of the first choke coil L1 is electrically connected to the second end (end of winding) of the second choke coil L2. In other words, the first choke coil L1 and the second choke coil L2 are electrically connected in series to the first power supply terminal 10A. These two choke coils can suppress normal mode noise.

The rectifier circuit 13 is composed of a diode bridge. The positive AC input terminal of the rectifier circuit 13 is electrically connected to the first end (start of winding) of the second choke coil L2. The negative AC input terminal of the rectifier circuit 13 is electrically connected to the second power supply terminal 10B. A pair of pulsating current output terminals of the rectifier circuit 13 are electrically connected in parallel to the capacitor C2.

The conversion circuit 11 has a switching converter circuit such as a flyback converter circuit. The conversion circuit 11 is electrically connected in parallel with the capacitor C2 to a pair of pulsating output terminals of the rectifier circuit 13, and converts the pulsating voltage full-wave rectified by the rectifier circuit 13 into a DC voltage. The conversion circuit 11 applies a DC voltage to the LED 2 via the first output terminal 14A and the second output terminal 14B, and also passes a current (forward current) through the LED 2 to light it up. However, the conversion circuit 11 may be a switching converter circuit other than a flyback converter circuit.

The control circuit 15 switches the semiconductor switching element included in the conversion circuit 11 (switching converter circuit). The control circuit 15 controls the semiconductor switching element using PWM (Pulse Width Modulation) to make the output current of the conversion circuit 11 (the forward current flowing through the LED 2) match a target value. Furthermore, the control circuit 15 measures the conduction angle of the AC voltage phase-controlled by the dimmer 9, and adjusts the target value of the output current according to the measured conduction angle, thereby dimming the LED 2.

The power supply device 1 includes a power supply terminal 10, a conversion circuit 11, a filter circuit 12, a rectifier circuit 13, a pair of output terminals, and a printed wiring board 16 on which a control circuit 15 is mounted (see FIG. 2).

The printed wiring board 16 is formed in a rectangular flat plate shape. Insert components including a first choke coil L1 and a second choke coil L2 are mounted on the front surface (component surface 160) of the printed wiring board 16. Meanwhile, printed wiring is formed on the back surface (solder surface) of the printed wiring board 16. Surface-mounted components such as a control circuit 15 and semiconductor switching elements are mounted on the solder surface of the printed wiring board 16.

On the component side 160 of the printed wiring board 16, the power supply terminal 10, the first choke coil L1, and the second choke coil L2 are mounted on the longitudinal ends of the printed wiring board 16 (see FIG. 2). The power supply terminal 10 is a quick-connect terminal block.

The first choke coil L1 and the second choke coil L2 are each a so-called radial lead type drum-shaped inductor. A radial lead type drum-shaped inductor has a winding wound around a drum-shaped magnetic core and is covered with a cylindrical cover, with two leads protruding from the part that corresponds to the bottom surface of the cylinder. In addition, the first choke coil L1 and the second choke coil L2 are both non-shielded types (open magnetic circuit types), so they generate leakage flux. Note that the first choke coil L1 and the second choke coil L2 are inductors with the same part number and characteristics from the same manufacturer, and it is preferable that their inductance values, outer diameters, and heights are equal.

The first choke coil L1 and the second choke coil L2 are mounted on the component surface 160 of the printed wiring board 16 so that the axial direction of the drum-shaped magnetic core is approximately aligned with the normal direction of the component surface 160 of the printed wiring board 16 (perpendicular to the paper surface in FIG. 2). However, the first choke coil L1 and the second choke coil L2 are mounted on the component surface 160 of the printed wiring board 16 at a distance that is shorter than their respective outer diameters (see FIG. 2).

The power supply device 1 includes a housing 17 that houses a printed wiring board 16 (see FIG. 3). The housing 17 is formed into a rectangular parallelepiped shape using a plate material of a ferromagnetic metal (e.g., stainless steel, galvanized steel, etc.). The printed wiring board 16 is housed inside the housing 17. An electric cable 18 is drawn out from the side surface of one end in the longitudinal direction of the housing 17. The two electric wires that make up the electric cable 18 are electrically connected to the first output terminal 14A and the second output terminal 14B of the power supply device 1, one each.

(3. Configuration of lighting fixture according to embodiment)
As shown in FIG. 3 , the lighting fixture 4 according to the embodiment (hereinafter, simply referred to as lighting fixture 4 ) includes a fixture body 40 , a power supply device 1 , a light-transmitting cover 41 , a frame 42 , and a pair of mounting springs 43 .

The fixture body 40 has a cylindrical body 400 and a truncated cone reflector 401. The LED 2 is housed in the body 400. Light emitted from the LED 2 is emitted from the open bottom surface of the body 400 to the outside. However, the bottom surface of the body 400 is covered with a translucent cover 41. The translucent cover 41 is formed in a cylindrical shape from a translucent material such as acrylic resin. It is preferable that the translucent cover 41 has light diffusing properties. Thus, the light emitted from the LED 2 is diffused by the translucent cover 41 and irradiated into the lighting space.

The frame 42 is formed in a circular ring shape from a metal material such as zinc steel plate. The frame 42 is attached integrally to the tip (lower end) of the reflector 401.

Each of the pair of mounting springs 43 is formed, for example, in a curved band shape from a stainless steel plate. One longitudinal end of each mounting spring 43 is fixed to the side of the device body 40.

The lighting fixture 4 is installed so as to be embedded in the ceiling indoors. That is, the fixture body 40 and a pair of mounting springs 43 are inserted into a circular embedding hole provided in the ceiling, and the fixture body 40 is attached to the ceiling by sandwiching the ceiling (ceiling material) between the pair of mounting springs 43 and the frame 42. The power supply unit 1 is placed in the ceiling through the embedding hole.

(4. Features of the power supply unit)
Incidentally, the squeal (noise) of the choke coil (inductor) described in the prior art is considered to be generated by the vibration of the choke coil in the human audible frequency range (approximately 20 Hz to 20 kHz). The open magnetic circuit type choke coil vibrates due to the magnetostrictive action of the magnetic core and the vibration of the winding due to leakage flux. The acoustic noise caused by the vibration of the choke coil is amplified due to contact with other components and the action of leakage flux on surrounding magnetic bodies. For example, the acoustic noise may be amplified by the vibration of the choke coil caused by the printed wiring board mounting vibrating due to the vibration of the choke coil, or by the leakage flux acting on the metal housing that houses the printed wiring board, causing the housing to vibrate.

In addition, in the power supply device 1 (and lighting device 3), when the AC voltage supplied from the AC power supply 8 is phase-controlled by the dimmer 9, a sudden voltage change occurs at a frequency twice the frequency of the AC voltage (50 Hz or 60 Hz). This increases the possibility that the choke coil constituting the filter circuit 12 will vibrate at a frequency of 100 Hz or 120 Hz and its harmonics, emitting acoustic noise.

In order to suppress the acoustic noise of the power supply device 1 caused by the squeal of the choke coil, it is effective to suppress the vibration of the choke coil itself. Therefore, the power supply device 1 according to the embodiment has multiple choke coils (first choke coil L1 and second choke coil L2) that make up the filter circuit 12, and is configured so that the magnetic fluxes generated in these multiple choke coils weaken each other.

That is, in the power supply device 1, the first choke coil L1 and the second choke coil L2 are electrically connected in series to have opposite polarity. Therefore, the magnetic flux between the first choke coil L1 and the second choke coil L2 is in the opposite direction to each other. As a result, the power supply device 1 can suppress the vibration of the multiple choke coils (the first choke coil L1 and the second choke coil L2) and suppress acoustic noise (noise) compared to a case in which the filter circuit has only one choke coil. Furthermore, in the power supply device 1, the magnetic flux between the first choke coil L1 and the second choke coil L2 is weakened, so that the leakage magnetic flux passing through the housing 17 that houses the printed wiring board 16 can be reduced. As a result, the power supply device 1 can suppress noise caused by the vibration of the housing 17.

Here, on the component side 160 of the printed wiring board 16, the first choke coil L1 and the second choke coil L2 are mounted close to each other at a distance shorter than the outer diameter of each choke coil (see FIG. 2). In other words, the closer the distance between the first choke coil L1 and the second choke coil L2 is, the less magnetic flux passes through the respective magnetic cores and windings, and the more vibrations of the first choke coil L1 and the second choke coil L2 can be suppressed. However, if the first choke coil L1 and the second choke coil L2 come into contact with each other, there is a risk that their vibrations will be amplified, so it is necessary to avoid bringing the first choke coil L1 and the second choke coil L2 into contact with each other.

5. Test Results of the Embodiments
Next, the test results of the test for measuring the noise of the power supply device 1 according to the embodiment (lighting device 3) and the power supply device according to the comparative example will be described. The power supply device according to the comparative example differs from the power supply device 1 according to the embodiment in that the filter circuit is composed of one capacitor C1 and one choke coil. Incidentally, in the power supply device 1 according to the embodiment, the first choke coil L1 and the second choke coil L2 are composed of inductors having a diameter of 8 mm and an inductance value of 1.0 mH. On the other hand, in the power supply device according to the comparative example, the choke coil is composed of an inductor having a diameter of 10 mm and an inductance value of 3.3 mH.

A test was conducted to measure the sound pressure spectrum level (unit: dB) of noise when an AC voltage was input in which the firing angle (also called the phase angle) of the bidirectional three-terminal thyristor in phase control was controlled to π/2 (the phase at which the AC voltage reaches its peak value) for the power supply device 1 according to the embodiment and the power supply device according to the comparative example. The sound pressure spectrum level of noise (background noise) when the power supply device 1 according to the embodiment and the power supply device according to the comparative example were stopped was also measured.

The broken line α2 in FIG. 4A shows the measurement results (sound pressure spectrum level) of the power supply device of the comparative example, and the broken line α1 in FIG. 4B shows the measurement results (sound pressure spectrum level) of the power supply device 1 according to the embodiment. The broken line β1 in FIGS. 4A and 4B shows the measurement results (sound pressure spectrum level) of background noise. Furthermore, the symbol AV2 in FIG. 4A shows the A-weighted sound pressure level of the power supply device of the comparative example, and the symbol AV1 in FIG. 4B shows the A-weighted sound pressure level of the power supply device 1 according to the embodiment. Note that the "A-weighted sound pressure level" is the sum (unit: dB(A)) of the sound pressure spectrum levels of each frequency after correcting them with the A-weighting.

As is clear from the measurement results shown in Figures 4A and 4B, the noise (acoustic noise) of the power supply device 1 according to the embodiment is reduced by approximately 7 to 8 dB (A) compared to the noise (acoustic noise) of the power supply device of the comparative example (AV1 = 11.8 dB (A), AV2 = 19.3 dB (A)).

(6. Modifications of the Power Supply Device)
Next, several modified examples of the power supply device 1 according to the embodiment will be briefly described with reference to the drawings. Note that the power supply device 1 of each modified example described below is characterized by the configuration of the filter circuit 12, and the configuration other than the filter circuit 12 is common to the power supply device 1 according to the embodiment. Therefore, illustrations and descriptions of the configuration common to the power supply device 1 according to the embodiment will be omitted as appropriate.

(6-1. Configuration of Power Supply Device of Modification 1)
As shown in Fig. 5, the filter circuit 12 in the power supply device 1 of the first modification has a different connection position of the second choke coil L2. That is, the first end (winding start) of the second choke coil L2 is electrically connected to the second power supply terminal 10B, and the second end (winding end) of the second choke coil L2 is electrically connected to the negative AC input terminal of the rectifier circuit 13. Also, the second end (winding end) of the first choke coil L1 is electrically connected to the positive AC input terminal of the rectifier circuit 13. That is, the first choke coil L1 is inserted in the path of the current flowing from the first power supply terminal 10A to the conversion circuit 11, and the second choke coil L2 is inserted in the path of the current flowing from the conversion circuit 11 to the second power supply terminal 10B.

In the power supply device 1 of the first modification, the first choke coil L1 and the second choke coil L2 are electrically connected in series to have opposite polarity. Therefore, like the power supply device 1 of the embodiment, the power supply device 1 of the first modification weakens the magnetic flux between the first choke coil L1 and the second choke coil L2, thereby suppressing acoustic noise. In addition, the filter circuit 12 has the advantage of providing a filter effect not only against normal mode noise but also against common mode noise by inserting the first choke coil L1 and the second choke coil L2 into the forward and return power lines, one each.

(6-2. Configuration of power supply device according to modification 2)
6, the filter circuit 12 in the power supply device 1 of the second modification has a different connection position of the second choke coil L2. That is, the first end (winding start) of the second choke coil L2 is electrically connected to the second end (winding end) of the first choke coil L1, and the second end (winding end) of the second choke coil L2 is electrically connected to the first end (winding start) of the first choke coil L1. That is, the first choke coil L1 and the second choke coil L2 are electrically connected in parallel.

In the power supply device 1 of the second modification, the first choke coil L1 and the second choke coil L2 are also electrically connected to have opposite polarity. Therefore, like the power supply device 1 of the embodiment, the power supply device 1 of the second modification also weakens the magnetic flux between the first choke coil L1 and the second choke coil L2, thereby suppressing acoustic noise. Furthermore, in the power supply device 1 of the second modification, the current flowing through the first choke coil L1 and the second choke coil L2 is reduced by half compared to the power supply device 1 of the embodiment and the first modification. Therefore, the power supply device 1 of the second modification is more suitable for applications that require a larger current to flow than the power supply device 1 of the embodiment and the first modification.

(6-3. Configuration of power supply device according to modification 3)
In the filter circuit 12 in the power supply device 1 of the third modification, as shown in FIG. 7, the first choke coil L1 and the second choke coil L2 are connected at different positions. That is, the first end (winding start) of the first choke coil L1 is electrically connected to the positive pulsating current output terminal of the rectifier circuit 13, and the second end (winding end) of the first choke coil L1 is electrically connected to the second end (winding end) of the second choke coil L2. The first end (winding start) of the second choke coil L2 is electrically connected to one end of the high potential side of the capacitor C2. That is, the first choke coil L1 and the second choke coil L2 are inserted in the path of the current flowing from the rectifier circuit 13 to the conversion circuit 11.

In the power supply device 1 of the third modification, the first choke coil L1 and the second choke coil L2 are electrically connected in series to have opposite polarity. Therefore, like the power supply device 1 of the embodiment, the power supply device 1 of the third modification also weakens the magnetic flux between the first choke coil L1 and the second choke coil L2, thereby suppressing acoustic noise. In addition, since the current flowing through the first choke coil L1 and the second choke coil L2 is rectified by the rectifier circuit 13, the peak-to-peak value is approximately half that of the current before rectification. Therefore, the power supply device 1 of the third modification can further reduce acoustic noise. Furthermore, the power supply device 1 of the third modification can also reduce hysteresis loss in the magnetic cores (drum-shaped magnetic cores) of the first choke coil L1 and the second choke coil L2.

Note that the power supply device 1 according to the embodiment and the power supply device 1 according to the modification 1-3 have a light source (LED 2) as a load, but it is also possible to supply power to a load other than a light source. Also, the number of choke coils constituting the filter circuit 12 is not limited to two. In other words, the filter circuit 12 may have three or more choke coils.

(7. Summary)
A power supply device (1) according to a first aspect of the present disclosure includes a pair of power supply terminals (10) and a conversion circuit (11) that converts an AC voltage input from the pair of power supply terminals (10) into a DC voltage. The power supply device (1) according to the first aspect includes a filter circuit (12) provided between the pair of power supply terminals (10) and the conversion circuit (11). The filter circuit (12) has a plurality of choke coils (a first choke coil L1, a second choke coil L2). Each of the plurality of choke coils is inserted in a path of a current flowing from the pair of power supply terminals (10) to the conversion circuit (11). The plurality of choke coils are configured so that the magnetic fluxes generated when a current flows are in the opposite directions to each other.

The power supply device (1) according to the first aspect is able to suppress the vibration of multiple choke coils and reduce noise caused by the vibration of the choke coils, compared to a case in which the filter circuit (12) has only one choke coil.

The power supply device (1) according to the second aspect of the present disclosure can be realized by combining it with the first aspect. In the power supply device (1) according to the second aspect, it is preferable that the multiple choke coils are inserted in a path of current flowing from one of the pair of power supply terminals (10) (first power supply terminal 10A) to the conversion circuit (11).

The power supply device (1) according to the second aspect makes it easier to narrow the distance between multiple choke coils when mounting multiple choke coils on a printed wiring board. As a result, the power supply device (1) according to the second aspect can further suppress noise caused by vibration of the choke coils.

The power supply device (1) according to the third aspect of the present disclosure can be realized by combining it with the first aspect. In the power supply device (1) according to the third aspect, the pair of power supply terminals (10) preferably comprises a first power supply terminal (10A) and a second power supply terminal (10B). The multiple choke coils preferably have a first choke coil (L1) and a second choke coil (L2). The first choke coil (L1) is preferably inserted in the path of the current flowing from the first power supply terminal (10A) to the conversion circuit (11). The second choke coil (L2) is preferably inserted in the path of the current flowing from the conversion circuit (11) to the second power supply terminal (10B).

The power supply device (1) according to the third aspect can reduce normal mode noise by inserting the first choke coil (L1) and the second choke coil (L2) in different paths.

The power supply device (1) according to the fourth aspect of the present disclosure can be realized by combining it with the second aspect. In the power supply device (1) according to the fourth aspect, it is preferable that the multiple choke coils are electrically connected in series with each other.

The power supply device (1) according to the fourth aspect makes it easier to further reduce the distance between multiple choke coils when multiple choke coils are mounted on a printed wiring board.

The power supply device (1) according to the fifth aspect of the present disclosure can be realized by combining it with the second aspect. In the power supply device (1) according to the fifth aspect, it is preferable that the multiple choke coils are electrically connected in parallel with each other.

The power supply device (1) according to the fifth aspect can further suppress vibrations of the multiple choke coils because the current flowing through each of the multiple choke coils is reduced.

The power supply device (1) according to the sixth aspect of the present disclosure can be realized by combining it with any of the first to fifth aspects. The power supply device (1) according to the sixth aspect preferably includes a rectifier circuit (13) that rectifies the AC voltage input from the pair of power supply terminals (10). Each of the multiple choke coils is preferably inserted in the path of the current flowing from the rectifier circuit (13) to the conversion circuit (11).

The power supply device (1) according to the sixth aspect can suppress the vibration of multiple choke coils and reduce noise caused by the vibration of the choke coils.

The power supply device (1) according to the seventh aspect of the present disclosure can be realized by combining it with any of the first to sixth aspects. In the power supply device (1) according to the seventh aspect, it is preferable that the filter circuit (12) has two choke coils (first choke coil L1, second choke coil L2) each having the same inductance.

The power supply device (1) according to the seventh aspect has two choke coils with equal inductance, making it easy to suppress vibrations of these two choke coils.

The power supply device (1) according to the eighth aspect of the present disclosure can be realized in combination with the seventh aspect. The power supply device (1) according to the eighth aspect preferably includes a printed wiring board (16) on which the filter circuit (12) is mounted. On the component side (160) of the printed wiring board (16), the two choke coils are preferably mounted close to each other at a distance shorter than the outer diameter of the choke coils.

The power supply device (1) according to the eighth aspect can further suppress the vibration of the choke coil by shortening the distance between the two choke coils.

The power supply device (1) according to the ninth aspect of the present disclosure can be realized by combining it with any of the first to eighth aspects. The power supply device (1) according to the ninth aspect preferably includes a control circuit (15) that controls the conversion circuit (11). The control circuit (15) preferably measures the conduction angle of the phase-controlled AC voltage input to the pair of power supply terminals (10) and adjusts the output of the conversion circuit (11) according to the conduction angle.

The power supply device (1) according to the ninth aspect can further suppress noise caused by vibration of the choke coil when a phase-controlled AC voltage is input.

The power supply device (1) according to the tenth aspect of the present disclosure can be realized in combination with the ninth aspect. The power supply device (1) according to the tenth aspect preferably includes a housing (17) that houses a printed wiring board (16). The housing (17) is preferably formed of a ferromagnetic metal.

The power supply device (1) according to the tenth aspect can reduce the manufacturing costs of the housing (17) while suppressing noise caused by vibration of the choke coil.

The lighting device (3) according to the eleventh aspect of the present disclosure has a power supply device (1) according to any one of the first to tenth aspects, and a light source (LED2) that is illuminated by DC power supplied from the power supply device (1).

The lighting device (3) according to the eleventh aspect can suppress the vibration of multiple choke coils and reduce noise caused by the vibration of the choke coils.

The lighting device (3) according to the twelfth aspect of the present disclosure can be realized in combination with the eleventh aspect. In the lighting device (3) according to the eleventh aspect, it is preferable that the conversion circuit (11) has a switching converter circuit.

The lighting device (3) according to the twelfth aspect can reduce noise generated in the conversion circuit (11) by the filter circuit (12).

The lighting fixture (4) according to the thirteenth aspect of the present disclosure has the lighting device (3) according to the eleventh or twelfth aspect and a fixture body (40) that supports at least the light source.

The lighting device (4) according to the thirteenth aspect can suppress the vibration of multiple choke coils and reduce noise caused by the vibration of the choke coils.

1 Power supply device 2 LED (light source)
REFERENCE SIGNS 3: Lighting device 4: Lighting fixture 10: Power terminal 10A: First power terminal 10B: Second power terminal 11: Conversion circuit 12: Filter circuit 13: Rectification circuit 16: Printed wiring board 17: Housing 40: Fixture body L1: First choke coil (choke coil)
L2 Second choke coil (choke coil)

Claims (11)

A pair of power terminals;
a conversion circuit for converting an AC voltage input from the pair of power supply terminals into a DC voltage;
a filter circuit provided between the pair of power supply terminals and the conversion circuit;
a printed wiring board on which the filter circuit is mounted;
Equipped with
The filter circuit includes two choke coils each having the same inductance,
Each of the two choke coils is a non-shielded type (open magnetic circuit type) radial lead type drum inductor, and is inserted in a path of current flowing from the pair of power supply terminals to the conversion circuit,
The two choke coils are configured such that magnetic fluxes generated when the current flows are in opposite directions to each other,
the two choke coils are mounted close to each other at a distance shorter than the outer diameter of the choke coils on the component side of the printed wiring board;
Power supply. The two choke coils are inserted in a path of a current flowing from one of the pair of power supply terminals to the conversion circuit.
2. The power supply device according to claim 1. the pair of power supply terminals includes a first power supply terminal and a second power supply terminal,
The two choke coils are
a first choke coil inserted in a path of a current flowing from the first power supply terminal to the conversion circuit;
a second choke coil inserted in a path of a current flowing from the conversion circuit to the second power supply terminal;
2. The power supply device according to claim 1. The two choke coils are electrically connected in series with each other.
3. The power supply device according to claim 2. The two choke coils are electrically connected in parallel to each other.
3. The power supply device according to claim 2. a rectifier circuit that rectifies an AC voltage input from the pair of power supply terminals,
The two choke coils are each inserted in a path of a current flowing from the rectifier circuit to the converter circuit.
A power supply device according to any one of claims 1 to 5. A control circuit for controlling the conversion circuit is provided.
the control circuit measures a conduction angle of the phase-controlled AC voltage input to the pair of power supply terminals, and adjusts an output of the conversion circuit in accordance with the conduction angle.
A power supply device according to any one of claims 1 to 6. a housing for accommodating the printed wiring board;
The housing is made of a ferromagnetic metal.
8. The power supply device according to claim 7. A power supply device according to any one of claims 1 to 8;
a light source that is turned on by DC power supplied from the power supply device;
having
Lighting equipment. The conversion circuit includes a switching converter circuit.
10. The lighting device of claim 9. A lighting device according to claim 9 or 10;
A fixture body that supports at least the light source;
having
Lighting fixtures.

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