JP2009189183A - Power supply device and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply device that promptly turns off a semiconductor light emitting device by turning off the power supply, and to provide a luminaire. <P>SOLUTION: In the power supply device, energy discharged through the secondary winding 16b of a switching transformer 16 by turning on/off of a switching transistor 17 is converted into DC output with rectifying/smoothing circuits 23, thereby turning on light emitting diodes 24 to 27 with the converted DC output. A switching part 151 and a series circuit of a resistor 28 as an electric charge consumption means are connected in parallel with the series circuit of the light emitting diodes 24 to 27. The switching part 151 is turned on by means of a detection signal sent when a power supply off detecting part 15 detects the supply off of power, causing the resistor 28 to forcibly consume the electric charges remaining in the smoothing capacitors 22 on the rectifying/smoothing circuits 23 immediately after the supply off of power. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power supply device and a lighting fixture that are optimal for driving a semiconductor light emitting element such as a light emitting diode.

  Recently, as a power source for a semiconductor light emitting element such as a light emitting diode, a DC power source device using a switching means is often used.

As this type of power supply device, as disclosed in Patent Document 1, a voltage detection circuit that detects an output voltage of a DC-DC converter, and a current detection that detects an output current supplied from the DC-DC converter to a light emitting diode And a circuit that adjusts the output of the DC-DC converter based on the detection voltage and detection current of the voltage detection circuit and the current detection circuit. Further, Patent Document 1 also discloses that a light control function for adjusting the light amount of the light emitting diode according to a light control signal given from the outside is disclosed.
JP 2006-210835 A

  By the way, a DC-DC converter used in such a power supply device, for example, a flyback type has a switching transformer, supplies a DC input to the primary winding of the transformer, and turns on the switching element. The excitation energy is stored in the primary winding of the switching transformer, and the excitation energy stored in the primary winding of the switching transformer is output from the secondary winding when the switching element is off, and the alternating current output from this secondary winding. The output is rectified through a diode of a rectifying and smoothing circuit, smoothed by a smoothing capacitor, and supplied to the light emitting diode as a direct current output.

  However, according to such a power supply device, for example, immediately after the power is turned off after the input supply to the primary winding of the transformer is cut off, the electric charge accumulated in the smoothing capacitor of the rectifying and smoothing circuit remains as it is. For this reason, even when the power is turned off, the residual charge of the smoothing capacitor is supplied to the light emitting diode, and the light emitting element may continue to be lit without being turned off. This is particularly true for a smoothing capacitor of a rectifying / smoothing circuit when the power is turned off during light load operation (so-called deep dimming) in which the light amount of the light emitting diode is reduced, in the case of having a dimming function. Since the impedance on the load (light emitting diode) side is large with respect to the amount of remaining charge, the remaining charge cannot be consumed quickly, and even after the power is turned off, the light is supplied to the light emitting diode and continues to light for a while. The problem of end up.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a power supply device and a lighting fixture that can quickly turn off a semiconductor light emitting element when the power is turned off.

  The invention according to claim 1 is driven by the switching means and generates a direct current output from the alternating current power of the alternating current power supply through the rectifying and smoothing means; and lighting by the direct current output generated by the direct current output generation means And a charge consuming means for consuming charge remaining in the rectifying / smoothing means supplied to the semiconductor light-emitting element from the rectifying / smoothing means when the AC power supply is turned off. .

  According to a second aspect of the present invention, in the first aspect of the present invention, the direct current output generating means further includes a dimming means for adjusting the amount of light of the semiconductor light emitting element.

  According to a third aspect of the present invention, in the first aspect of the present invention, the DC output generating means includes control means for controlling a switching operation of the switching means, and the charge consuming means is turned off by turning off the AC power supply. The electric charge remaining in the rectifying and smoothing means is supplied and consumed as a power source for the control means.

  According to a fourth aspect of the present invention, there is provided a lighting fixture comprising the power supply device according to any one of the first to third aspects and a fixture main body having the power supply device.

  According to the first aspect of the present invention, it is possible to provide a power supply device capable of quickly turning off the semiconductor light emitting element when the power is turned off.

  According to the second aspect of the present invention, the semiconductor light emitting element can be quickly turned off by turning off the power even during dimming control.

  According to the third aspect of the present invention, the semiconductor light emitting element can be quickly turned off by consuming the residual charge of the rectifying and smoothing means by the power supply of the control means when the power is turned off.

  According to the fourth aspect of the present invention, it is possible to provide a lighting fixture capable of quickly turning off the semiconductor light emitting element when the power is turned off.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, the lighting fixture to which the power supply device of the present invention is applied will be briefly described. 1 and 2, reference numeral 1 denotes an instrument body, and the instrument body 1 is made of aluminum die-casting and has a cylindrical shape with both ends opened. The appliance body 1 is internally divided into three in the vertical direction by partition members 1 a and 1 b, and a space between the lower opening and the partition member 1 a is formed in the light source unit 2. The light source unit 2 is provided with a plurality of LEDs 2a and reflectors 2b as semiconductor light emitting elements. The plurality of LEDs 2a are arranged and mounted at equal intervals along the circumferential direction of a disk-shaped wiring board 2c provided on the lower surface of the partition member 1a.

  A space between the partition members 1 a and 1 b of the instrument body 1 is formed in the power supply chamber 3. In the power supply chamber 3, a wiring board 3a is disposed on the partition member 1a. The wiring board 3a is provided with each electronic component constituting the power supply device of the present invention for driving the plurality of LEDs 2a. The DC power supply device and the plurality of LEDs 2 a are connected by lead wires 4.

  A space between the partition plate 1 b of the instrument body 1 and the upper opening is formed in the power supply terminal chamber 5. In the power terminal room 5, a power terminal block 6 is provided on the partition plate 1b. This power supply terminal block 6 is a terminal block for supplying AC power of commercial power to the power supply device in the power supply chamber 3, and serves as a power cable terminal portion on both sides of the box 6a made of electrically insulating synthetic resin. It has an insertion port 6b, an insertion port 6c serving as a feed cable terminal, a release button 6d for separating the power line and the feed line, and the like.

  FIG. 3 shows a schematic configuration of the power supply device of the present invention incorporated in the power supply chamber 3 of the lighting fixture configured as described above.

  In FIG. 3, 11 is an AC power source, and this AC power source 11 is a commercial power source (not shown). The AC power supply 11 is connected to an input terminal of a full-wave rectifier circuit 13 via a power switch 12. The power switch 12 selects and turns on / off AC power of the AC power supply 11 supplied to the full-wave rectifier circuit 13. The full-wave rectifier circuit 13 generates an output obtained by full-wave rectifying the AC power from the AC power supply 11.

  A ripple current smoothing capacitor 14 is connected between the positive and negative output terminals of the full-wave rectifier circuit 13. In addition, a power-off detector 15 is connected to both ends of the capacitor 14, and a series circuit of a primary winding 16a of a switching transformer 16 serving as a flyback transformer and a switching transistor 17 serving as switching means is connected. . The power-off detection unit 15 outputs a detection signal when the AC power supply is turned off (power off) by operating the power switch 12 to turn on the switch unit 151. The power off detection unit 15 may be a relay circuit or a semiconductor circuit. The switching transformer 16 has a secondary winding 16b magnetically coupled to the primary winding 16a.

  Connected to both ends of the primary winding 16a of the switching transformer 16 is a snubber circuit 211 composed of a parallel circuit of a capacitor 18 and a resistor 19 and a series-parallel circuit of a diode 20 of the polarity shown. This snubber circuit 211 absorbs the flyback voltage generated in the primary winding 16 a of the switching transformer 16 by charging by the capacitor 18 and discharging of the resistor 19, and absorbs the ringing voltage generated by the leakage inductance of the switching transformer 16 by the capacitor 18. To do.

  The secondary winding 16b of the switching transformer 16 is connected to a rectifying / smoothing circuit 23 including a diode 21 having a polarity shown and a smoothing capacitor 22 as rectifying / smoothing means. The rectifying / smoothing circuit 23 constitutes a DC output generating means together with the switching transistor 17 and the switching transformer 16, rectifies the AC output generated from the secondary winding 16b of the switching transformer 16 by the diode 21, and the rectified output is smoothed by the smoothing capacitor. 22 is smoothed and generated as a DC output.

  At both ends of the smoothing capacitor 22 of the rectifying and smoothing circuit 23, a plurality of (four in the illustrated example) semiconductor light-emitting elements connected in series correspond to the light-emitting diodes 24-27 (LED 2a described in FIG. 2). ) Is connected.

  The series circuit of the light emitting diodes 24 to 27 is connected in parallel with a switch circuit 151 and a series circuit of a resistor 28 as an impedance element as charge consuming means. The switch unit 151 is turned on by a detection signal when the power-off detection unit 15 detects power-off. The resistor 28 has a resistance value smaller than the resistance value of the series circuit of the light emitting diodes 24 to 27 and forcibly consumes the charge remaining in the capacitor 22 of the rectifying and smoothing circuit 23 immediately after the power is turned off.

  A current detection unit 29 is connected in series to the series circuit of the light emitting diodes 24 to 27. The current detector 29 detects the current flowing through the light emitting diodes 24 to 27 and outputs a detection signal corresponding to the detected current.

  A control circuit 30 is connected to the current detection unit 29 as control means. The control circuit 30 is driven by a power supply unit (not shown), and the switching transistor 17 is switched on and off by its operation to drive the switching transformer 16. In this case, the control circuit 30 compares the detection signal of the current detection unit 29 with a reference value (not shown), controls the on / off operation of the switching transistor 17 based on the comparison result, and the current flowing through the light emitting diodes 24 to 27. Is controlled to be constant.

  A dimming operation unit 31 is connected to the control circuit 30 as dimming means. The dimming operation unit 31 inputs a dimming signal for adjusting the light amount of the light emitting diodes 24 to 27 to the control circuit 30. The control circuit 30 changes the reference value in accordance with the dimming signal from the dimming operation unit 31, and turns on / off the switching transistor 17 based on the changed reference value, whereby the light amounts of the light emitting diodes 24-27. Can be adjusted within a range of 0 to 100% of the rating, for example.

  Next, the operation of the embodiment configured as described above will be described.

  First, when the AC power of the AC power supply 11 supplied to the full-wave rectifier circuit 13 by the power switch 12 is turned on (power-on), the AC power of the AC power supply 11 is full-wave rectified by the full-wave rectifier circuit 13 and ripple current The signal is smoothed by the smoothing capacitor 14 and supplied to the switching transformer 16 and the switching transistor 17. In this case, the power-off detection unit 15 does not generate a detection signal when the power is turned on by the operation of the power switch 12, and the switch unit 151 is turned off (FIG. 1 shows this state).

  In this state, the switching transformer 16 is switched and driven by turning on and off the switching transistor 17 by the control circuit 30. In this case, when the switching transistor 17 is turned on, a current is passed through the primary winding 16a of the switching transformer 16 to accumulate energy, and when the switching transistor 17 is turned off, the energy accumulated in the primary winding 16a is discharged through the secondary winding 16b. To do. As a result, a direct current output is generated via the rectifying and smoothing circuit 23, and the light emitting diodes 24 to 27 are turned on by the direct current output.

  The current flowing through the light emitting diodes 24 to 27 is detected by the current detector 29, and a detection signal corresponding to the detected current is output to the control circuit 30. The control circuit 30 controls the on / off operation of the switching transistor 17 based on the comparison result between the detection signal from the current detection unit 29 and a reference value (not shown), and controls the current flowing through the light emitting diodes 24 to 27 to be constant. In this state, when a dimming signal for adjusting the light amount of the light emitting diodes 24 to 27 is input from the dimming operation unit 31, the control circuit 30 changes a reference value (not shown) by the dimming signal. The switching transistor 17 is turned on / off based on the changed reference value. Thereby, the electric current which flows into the light emitting diodes 24-27 is changed, and the light quantity of the light emitting diodes 24-27 is adjusted in the range of 0-100% of ratings, for example.

  From this state, when the AC power of the AC power supply 11 supplied to the full-wave rectifier circuit 13 by the power switch 12 is turned off (power off), the power is supplied to the light emitting diodes 24 to 27 from the switching transformer 16 via the rectifier smoothing circuit 23. The DC output that has been stopped stops. At the same time, power off is detected by the power off detector 15, the switch 151 is turned on by this detection signal, and the resistor 28 is connected in parallel with the series circuit of the light emitting diodes 24 to 27.

  Thereby, immediately after the power is turned off, the electric charge remaining in the smoothing capacitor 22 of the rectifying and smoothing circuit 23 is supplied to the resistor 28 via the switch unit 151 and consumed, so that the smoothing capacitor 22 supplied to the light emitting diodes 24 to 27 Residual charges are quickly removed, and the light emitting diodes 24 to 27 are immediately turned off when the power is turned off.

  This is particularly the case when the power is turned off during a light load operation (so-called deep dimming) in which the light emitting diodes 24 to 27 are turned on with the dimming control by the dimming operation unit 31 turned on. Since the impedance of the load (light emitting diodes 24 to 27) is large with respect to the amount of charge remaining in the smoothing capacitor 22, it may be difficult to consume the residual charge. The resistor 28 connected in parallel to the 27 series circuit can forcibly consume the charge of the smoothing capacitor 22 and the residual charge of the smoothing capacitor 22 can be quickly extinguished. The light emitting diodes 24 to 27 can be immediately turned off by turning off.

  Therefore, if this is done, the energy released through the secondary winding 16b of the switching transformer 16 when the switching transistor 17 is turned on and off is converted into a DC output by the rectifying and smoothing circuit 23, and the light emitting diodes 24 to 27 are converted by this DC output. A power supply device to be lit, wherein a series circuit of a switch unit 151 and a resistor 28 as charge consuming means is connected in parallel with a series circuit of light emitting diodes 24 to 27, and when the power supply off detection unit 15 detects power off. In response to the detection signal, the switch unit 151 is turned on, and the electric charge remaining in the smoothing capacitor 22 of the rectifying and smoothing circuit 23 is forcibly consumed by the resistor 28 immediately after the power is turned off. Thereby, since the electric charge accumulated in the smoothing capacitor 22 of the rectifying and smoothing circuit 23 can be quickly consumed when the power is turned off, the light emitting diodes 24 to 27 can be turned off immediately even when the power is turned off at the time of lighting. it can.

  Further, even during light load operation in which the light amount of the light emitting diodes 24 to 27 is reduced by the dimming control by the dimming operation unit 31, the electric charge of the smoothing capacitor 22 is forcibly consumed by the resistor 28. Thus, the charges can be quickly extinguished. Therefore, even during such dimming control, the light emitting diodes 24 to 27 can be immediately turned off by turning off the power.

  As a result, it is possible to avoid a situation in which the light emitting diodes 24 to 27 continue to be unnecessarily lit when the power is turned off, thereby eliminating the user's anxiety due to the light emitting diodes 24 to 27 not turning off even when the power is turned off. can do.

(Second Embodiment)
FIG. 4 shows a schematic configuration of a power supply device according to the second embodiment of the present invention. The same parts as those in FIG.

  In this case, the switch unit 152 of the power-off detection unit 15 that detects power-off by the operation of the power switch 12 is connected in parallel to the series circuit of the light-emitting diodes 25, 26, and 27 among the light-emitting diodes 24 to 27. The switch unit 152 is turned on by a power-off detection signal from the power-off detection unit 15 and short-circuits the light emitting diodes 25 to 27 to connect only the light emitting diode 24 to the rectifying and smoothing circuit 23.

  Others are the same as FIG.

  In this way, when the power is turned on by the power switch 12, the switch unit 152 is turned off, and the light emitting diodes 24 to 27 are all connected to the rectifying and smoothing circuit 23. In this case, it is assumed that the light emitting diodes 24 to 27 are turned on by the current I3 at the operating point A on the VI characteristic (load characteristic) curve shown in FIG.

  In this state, when the AC power of the AC power supply 11 supplied to the full-wave rectifier circuit 13 by the power switch 12 is turned off (power off), the switch unit 152 is turned on by the detection signal of the power off detection unit 15 to emit light. The diodes 25 to 27 are short-circuited, and only the light emitting diode 24 is connected to the rectifying and smoothing circuit 23.

  In this case, only the light-emitting diode 24 is connected to the rectifying / smoothing circuit 23 by turning on the switch unit 152 when the power is turned off, and the operating point A on the VI characteristic curve shown in FIG. A transition is made to the operating point B of the VI characteristic curve shown in FIG. 5B, and a large current I2 (> I3) flows through the light emitting diode 24. Thereby, the electric charge remaining in the smoothing capacitor 22 of the rectifying and smoothing circuit 23 is quickly consumed, and the light emitting diodes 24 to 27 are immediately turned off when the power is turned off.

  Therefore, even in this case, the charge remaining in the smoothing capacitor 22 of the rectifying / smoothing circuit 23 when the power is turned off can be quickly consumed. The light emitting diodes 24 to 27 can be turned off, and the same effect as in the first embodiment can be obtained.

(Third embodiment)
FIG. 6 shows a schematic configuration of a power supply apparatus according to the third embodiment of the present invention. The same parts as those in FIG.

  In this case, a detection signal of the power-off detection unit 15 that detects power-off due to the operation of the power switch 12 is input to the control circuit 30. The control circuit 30 has operating point switching means 301. When a detection signal is given from the power-off detector 15 when the power is turned off, the operating point switching unit 301 shifts the operating point C on the VI characteristic curve shown in FIG. 7 to the operating point A (or B), for example. Forcibly switch the point to the heavy load side.

  Others are the same as FIG.

  In this way, when the power switch 12 is in the power-on state, no detection signal is generated from the power-off detector 15, and the light emitting diodes 24 to 27 operate on the VI characteristic curve shown in FIG. It is lit by a current I3 at a point C.

  From this state, when the AC power of the AC power supply 11 supplied to the full-wave rectifier circuit 13 by the power switch 12 is turned off (power off), the detection signal of the power off detection unit 15 is the operating point switching means 301 of the control circuit 30. Is input. The operating point switching means 301 forcibly switches the operating point C on the VI characteristic curve shown in FIG. 7 to the heavy load side of the operating point A (or B) in accordance with the detection signal of the power-off detector 15, The control amount of 24-27 is changed. As a result, a large current I1 (> I3) flows through the light emitting diodes 24 to 27, and the electric charge remaining in the smoothing capacitor 22 of the rectifying and smoothing circuit 23 is quickly consumed. Turns off immediately when the power is turned off.

  Therefore, even in this case, the charge remaining in the smoothing capacitor 22 of the rectifying / smoothing circuit 23 when the power is turned off can be quickly consumed. The light emitting diodes 24 to 27 can be turned off, and the same effect as in the first embodiment can be obtained.

(Fourth embodiment)
FIG. 8 shows a schematic configuration of a power supply apparatus according to the fourth embodiment of the present invention. The same parts as those in FIG.

  In this case, the switching transformer 16 further includes an auxiliary winding 16c in addition to the secondary winding 16b magnetically coupled to the primary winding 16a. A series circuit of a diode 33 and a smoothing capacitor 34 in the polarity direction shown in the figure is connected to both ends of the auxiliary winding 16 c as a power supply unit of the control circuit 30. When an AC output is generated from the auxiliary winding 16c, the smoothing capacitor 34 is charged by the output of the diode 33 that rectifies the AC output, and supplies drive power to the power supply terminals 30a and 30b of the control circuit 30. Further, a connection point between the diode 33 and the smoothing capacitor 34 is connected to a connection point between the diode 21 and the smoothing capacitor 22 constituting the rectifying and smoothing circuit 23 via the switch unit 153. The switch unit 153 is turned on by a power-off detection signal from the power-off detection unit 15, and forcibly charges remaining in the smoothing capacitor 22 of the rectifying and smoothing circuit 23 to form a power source unit of the control circuit 30. 34 to be consumed.

  Others are the same as FIG.

  In this way, when the power is turned on by the power switch 12, the switch unit 153 is off, and the smoothing capacitor 22 of the rectifying and smoothing circuit 23 is disconnected from the power unit of the control circuit 30.

  From this state, when the AC power of the AC power supply 11 supplied to the full-wave rectifier circuit 13 by the power switch 12 is turned off (power off), the switch unit 153 is turned on by the detection signal of the power off detection unit 15. As a result, the electric charge remaining in the smoothing capacitor 22 of the rectifying and smoothing circuit 23 is supplied to the smoothing capacitor 34 constituting the power supply unit of the control circuit 30 and consumed quickly, and the light emitting diodes 24 to 27 are immediately turned off when the power is turned off. .

  Therefore, even in this case, the charge remaining in the smoothing capacitor 22 of the rectifying / smoothing circuit 23 when the power is turned off can be quickly consumed. The light emitting diodes 24 to 27 can be turned off, and the same effect as in the first embodiment can be obtained.

  When the control circuit 30 is made of a conversion element such as a microcomputer or a memory, for example, the charge remaining in the smoothing capacitor 22 of the rectifying and smoothing circuit 23 is supplied to the microcomputer when the power is turned off, and immediately before the power is turned off. It can also be used as a power source for writing the state of this in the memory of the microcomputer.

(Fifth embodiment)
FIG. 9 shows a schematic configuration of a power supply apparatus according to the fifth embodiment of the present invention. The same parts as those in FIG.

  In this case, power off due to operation of the power switch 12 is detected between the connection point of the diode 21 and the smoothing capacitor 22 constituting the rectifying and smoothing circuit 23 and the connection point of the capacitor 18 and the resistor 19 constituting the snubber circuit 211. A series circuit of the switch unit 154 of the power-off detection unit 15 and the diode 35 having the illustrated polarity is connected. The switch unit 154 is turned on by a power-off detection signal from the power-off detection unit 15, and charges remaining in the smoothing capacitor 22 of the rectifying and smoothing circuit 23 are transferred to the primary winding 16 a side ( It is returned to the input side) for consumption.

  Others are the same as FIG.

  In this way, when the power is turned on by the power switch 12, the switch unit 152 is turned off, and the diode 35 is disconnected from the smoothing capacitor 22 of the rectifying and smoothing circuit 23.

  In this state, when the AC power of the AC power supply 11 supplied to the full-wave rectifier circuit 13 by the power switch 12 is turned off (power off), the switch unit 154 is turned on by the detection signal of the power off detection unit 15. As a result, the electric charge remaining in the smoothing capacitor 22 of the rectifying and smoothing circuit 23 is returned to the primary winding 16a (input side) of the switching transformer 16 through the diode 35, and the snubber circuit 211 connected to the primary winding 16a side. It is consumed by impedance elements such as a capacitor 18 and a resistor 19 and impedance elements (not shown), and the light emitting diodes 24 to 27 are immediately turned off when the power is turned off.

  Therefore, even in this case, the charge remaining in the smoothing capacitor 22 of the rectifying / smoothing circuit 23 when the power is turned off can be quickly consumed. The light emitting diodes 24 to 27 can be turned off, and the same effect as in the first embodiment can be obtained.

(Sixth embodiment)
FIG. 10 shows a schematic configuration of a power supply device according to the sixth embodiment of the present invention. The same parts as those in FIG.

  In this case, a switch unit 155 of the power-off detection unit 15 that detects power-off due to the operation of the power switch 12 is connected as a cutoff unit in series with the light-emitting diodes 24 to 27. The switch unit 154 is normally turned on (FIG. 10 shows this state), and is turned off by a power-off detection signal from the power-off detection unit 15 to supply current to the light emitting diodes 24 to 27. Forcibly shut off the supply path.

  Others are the same as FIG.

  In this way, when the power is turned on by the power switch 12, the switch unit 155 is turned on, the light emitting diodes 24 to 27 are connected to the rectifying / smoothing circuit 23, and it is lit by the DC output from the rectifying / smoothing circuit 23. ing.

  In this state, when the AC power of the AC power supply 11 supplied to the full-wave rectifier circuit 13 by the power switch 12 is turned off (power off), the switch unit 155 is turned off by the detection signal of the power off detection unit 15 to emit light. The current supply path to the diodes 24 to 27 is forcibly cut off. Thereby, since the charge remaining in the smoothing capacitor 22 of the rectifying / smoothing circuit 23 is not supplied to the light emitting diodes 24 to 27, the light emitting diodes 24 to 27 are immediately turned off when the power is turned off.

  Therefore, even if it does in this way, since the influence on the light emitting diodes 24-27 of the charge remaining in the smoothing capacitor 22 of the rectifying / smoothing circuit 23 when the power is turned off can be quickly cut off, the light emitting diodes 24-27 are turned on. Even if the power is turned off sometimes, the light emitting diodes 24 to 27 can be quickly turned off, and the same effect as in the first embodiment can be obtained.

  In addition, this invention is not limited to the said embodiment, In the implementation stage, it can change variously in the range which does not change the summary. For example, in the above-described embodiment, the constant current control for controlling the current flowing through the light emitting diodes 24 to 27 to be always constant has been described. However, the present invention is not limited to this, and the voltage applied to the light emitting diodes 24 to 27 is always set. What applied the constant voltage control controlled so that it may become fixed may be used. Further, in the above-described embodiment, the example of the light emitting diode is described as the semiconductor light emitting element, but the present invention can be applied to the case where another semiconductor light emitting element such as a laser diode is used. Furthermore, in the above-described embodiment, the AC power supply 11 is described. However, the AC power supply 11 may be provided outside the apparatus.

  Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and is described in the column of the effect of the invention. If the above effect is obtained, a configuration from which this configuration requirement is deleted can be extracted as an invention.

The perspective view which shows the lighting fixture with which the power supply device concerning the 1st Embodiment of this invention is applied. Sectional drawing of the lighting fixture to which the power supply device concerning 1st Embodiment is applied. The figure which shows schematic structure of the power supply device concerning 1st Embodiment. The figure which shows schematic structure of the power supply device concerning the 2nd Embodiment of this invention. The figure which shows the VI characteristic of the light emitting diode for demonstrating operation | movement of 2nd Embodiment. The figure which shows schematic structure of the power supply device concerning the 3rd Embodiment of this invention. The figure which shows the VI characteristic of the light emitting diode for demonstrating operation | movement of 3rd Embodiment. The figure which shows schematic structure of the power supply device concerning the 4th Embodiment of this invention. The figure which shows schematic structure of the power supply device concerning the 5th Embodiment of this invention. The figure which shows schematic structure of the power supply device concerning the 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Instrument body, 2 ... Light source part, 2a ... LED
DESCRIPTION OF SYMBOLS 3 ... Power supply room, 5 ... Power supply terminal room 11 ... AC power supply, 12 ... Power switch 13 ... Full wave rectification circuit, 14 ... Capacitor 15 ... Power supply off detection part, 16 ... Switching transformer 17 ... Switching transistor, 23 ... Rectification smoothing circuit 24 to 27: light emitting diodes, 28: resistance 29 ... current detection unit, 30 ... control circuit 301 ... operating point switching means, 31 ... dimming operation unit 151-155 ... switch unit

Claims (4)

DC output generating means driven by the switching means and generating DC output from the AC power of the AC power source through the rectifying and smoothing means;
A semiconductor light emitting element which is turned on by a direct current output generated by the direct current output generation means;
Charge consuming means for consuming charges remaining in the rectifying / smoothing means supplied from the rectifying / smoothing means by the rectifying / smoothing means by turning off the AC power supply;
A power supply device comprising: The power supply apparatus according to claim 1, wherein the DC output generation unit includes a light control unit that adjusts a light amount of the semiconductor light emitting element. The DC output generating means has a control means for controlling the switching operation of the switching means,
2. The power supply apparatus according to claim 1, wherein the charge consuming means supplies and consumes the charge remaining in the rectifying and smoothing means as a power source of the control means when the AC power supply is turned off. An illumination fixture comprising: the power supply device according to any one of claims 1 to 3; and an appliance main body having the power supply device.

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