JP5321921B2 - Lighting fixture dimming system - Google Patents

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.

  By the way, this type of power supply device may be used for lighting equipment having a dimming function in which the amount of light of a light source can be arbitrarily adjusted for lighting in a store or the like. Such a lighting fixture generally uses a four-wire light control method as a light control method. This is because there are many lighting fixtures used in stores, etc., and there is no problem of harmonics of the input current like the dimming method by phase control, and it is suitable for operating many fixtures at the same time. It is.

  In the 4-wire dimming type, a so-called wall switch arranged on the wall surface is generally provided with a dimming operation unit, and the mechanical switch of the dimming operation unit is connected to a load via a feed terminal. The dimming signal generation unit is connected to the dimming signal generation unit, and the dimming signal generation unit outputs a dimming signal, which is sent to each lighting fixture. In this case, the mechanical switch of the dimming operation unit is turned on by the user, thereby turning on the power of the lighting fixture and simultaneously turning on the power of the dimming signal generation unit.

  However, there is no problem if the lighting switch is turned on (powered on) and the dimming signal generator is turned on (powered on) at the same time by turning on the mechanical switch, and the dimming signal is output immediately. If the luminaire is turned on before the light signal is output, a period in which the luminaire is lit in a state where the dimming signal is not input before the light amount is controlled to a desired light amount by the dimming signal occurs. This is because, in general, lighting fixtures are set to turn on in all-light state when a dimming signal is not input, so they are turned on in all-light state for a moment and then transition to the dimming state. Become

  This is because the conventional discharge lamp lighting circuit has a pre-heated state immediately after the power is turned on, and the circuit is set so that the lamp is not intentionally lit for a certain amount of time. Although this is not a problem, lighting fixtures that use light-emitting diodes as a recent light source tend to be in an all-light state immediately after startup due to a delay in the dimming signal. This causes a problem that the merchantability is significantly impaired.

  This invention is made | formed in view of the said situation, and it aims at providing the lighting fixture light control system which can obtain the stable lighting state in a semiconductor light-emitting device.

According to the luminaire dimming system of claim 1, dimming operation member and the light control means and comprising a dimming signal generator for generating a dimming signal by the operation of the dimming operation member; of the light control means a DC output generating means for outputting a DC power according to the dimming signal from the dimming signal generating unit, to the dimming signal from the dimming means to the power supply device from the at least immediately after power is turned on is output during the controls the DC output generation means to the semiconductor light emitting element is turned off, after the output of the dimming signal from the dimming means is output from the DC output generation means according to the dimming signal power supply and a control means for starting the lighting control of the semiconductor light emitting element according to the dimming signal by controlling the DC power; the DC power outputted from the DC output generation means of said power supply Semiconductor light emission supplied Son and; are provided with, the DC output generation means of said power supply device supplies an output enough to start the drive immediately after the power-on can not be turned on the semiconductor light emitting device, brightness fade in Thus, the lighting control of the semiconductor light emitting element is started .

  According to the present invention, it is possible to avoid a phenomenon in which a light-emitting signal is delayed for a predetermined time immediately after the power is turned on, so that all light is turned on for an instant immediately after start-up. It is possible to provide a lighting fixture dimming system capable of obtaining any one of the lighting states.

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 for demonstrating operation | movement of the power supply device concerning 1st Embodiment. The figure which shows only the principal part of the power supply device concerning the 2nd Embodiment of this invention.

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 15 through a filter circuit 14 having a capacitor 12 and an inductor 13. The full wave rectification circuit 15 generates an output obtained by full wave rectification of the AC power from the AC power supply 11.

  A ripple current smoothing capacitor 16 is connected between the positive and negative output terminals of the full-wave rectifier circuit 15. In addition, a series circuit of a primary winding 17a of a switching transformer 17 as a flyback transformer and a switching transistor 18 as a switching means is connected to both ends of the ripple current smoothing capacitor 16. The switching transformer 17 has a secondary winding 17b and a tertiary winding 17c that are magnetically coupled to the primary winding 17a.

  A snubber circuit 22 including a parallel circuit of a capacitor 19 and a resistor 20 and a series-parallel circuit of a diode 21 having the polarity shown in the figure is connected to both ends of the primary winding 17a of the switching transformer 17. This snubber circuit 22 absorbs the flyback voltage generated in the primary winding 17 a of the switching transformer 17 by charging by the capacitor 19 and discharging of the resistor 20, and absorbs the ringing voltage generated by the leakage inductance of the switching transformer 17 by the capacitor 19. To do.

  The secondary winding 17b of the switching transformer 17 is connected to a rectifying / smoothing circuit 25 including a diode 23 having a polarity shown and a smoothing capacitor 24 as rectifying / smoothing means. The rectifying / smoothing circuit 25 constitutes a DC output generating means together with the switching transistor 18 and the switching transformer 17, rectifies the AC output generated from the secondary winding 17b of the switching transformer 17 by the diode 23, and converts the rectified output into a smoothing capacitor. 24 is smoothed and generated as a DC output.

  At both ends of the smoothing capacitor 24 of the rectifying / smoothing circuit 25, a plurality of (four in the illustrated example) semiconductor light emitting elements connected in series correspond to the light emitting diodes 26 to 29 (LED 2a described in FIG. 2). ) Is connected.

  A series circuit of a diode 30 and a capacitor 31 is connected to the tertiary winding 17 c of the switching transformer 17. The diode 30 rectifies the AC output generated from the tertiary winding 17c, and the capacitor 31 generates the DC output by smoothing the rectified output of the diode 30.

  A series circuit of a resistor 32 and a phototransistor 332 of a photocoupler 33 is connected to the capacitor 31. The photocoupler 33 includes a light emitting diode 331 and a phototransistor 332 housed in the same package. The photocoupler 332 receives light generated from the light emitting diode 331 and generates an output. In this case, the light emitting diode 331 is provided in the dimming operation unit 34. The dimming operation unit 34 outputs a dimming signal from a dimming signal generation unit (not shown) as an optical signal from the light emitting diode 331 via the rectifier circuit 35. The dimming signal in this case can obtain different dimming depths by changing the duty ratio of the pulse signal.

  A series circuit of a capacitor 36 and a resistor 37 is connected to the capacitor 31. The series circuit of the capacitor 36 and the resistor 37 constitutes a differentiation circuit, and an output is generated at a connection point between the capacitor 36 and the resistor 37 for a predetermined time T by the output of the capacitor 31. The predetermined time T in this case is set longer than the maximum delay time TD until the dimming signal is output when the power is turned on. The resistor 37 is connected to a diode 38 having the illustrated polarity. This diode 38 is for discharging the charge of the capacitor 36.

  A base of a transistor 39 is connected to a connection point between the capacitor 36 and the resistor 37 as a switching element. This transistor 39 has an emitter grounded and a collector connected to the positive input terminal of the operational amplifier 40, and is turned on for a predetermined time T by an output generated at a connection point between the capacitor 36 and the resistor 37.

  A connection point a between the resistor 32 and the phototransistor 332 is grounded through a series circuit of the resistor 41 and the capacitor 42. The connection point b between the resistor 41 and the capacitor 42 is connected to the positive input terminal of the operational amplifier 40. In this case, the dimming signal (VDIM) shown in FIG. 4B output from the light emitting diode 331 and received by the phototransistor 332 is output to the connection point a between the resistor 32 and the phototransistor 332, and the resistor 41 and the capacitor A dimming output (Vdet) shown in FIG. 4C obtained by smoothing the dimming signal (VDIM) by the capacitor 42 is output to the connection point b of 42.

  The operational amplifier 40 has a negative input terminal connected to the output terminal, and this output terminal is connected to the control circuit 44 via a diode 43 having the polarity shown. Further, a reference signal Vref is connected to the control circuit 44 through a diode 45 having the illustrated polarity. In this case, the diodes 43 and 45 constitute an AND circuit, and the larger signal of the operational amplifier 40 and the reference signal Vref is controlled as a control signal Vcont at the connection point c as shown in FIG. Output to the circuit 44.

  The control circuit 44 controls the output supplied to the light emitting diodes 26 to 29 by switching the switching transistor 18 by the operation according to the control signal Vcont to switch the switching transformer 17.

  Next, the operation of the lighting fixture dimming system configured as described above will be described.

  In this case, the dimming operation unit 34 is in a state in which a dimming signal having a predetermined dimming depth can be output from the dimming signal generation unit, and the reference signal Vref emits light as shown in FIG. For example, it is assumed that the diodes 26 to 29 are set to a level necessary for lighting the diode with the minimum light amount.

  In this state, when a switch operation is performed by the dimming operation unit 34, the power of a dimming signal generation unit (not shown) is also turned on simultaneously with turning on (turning on) the lighting fixture. In this case, the AC power of the AC power supply 11 is supplied to the full-wave rectifier circuit 15 when the lighting apparatus is turned on, and the output shown in FIG. 4A is generated in the ripple current smoothing capacitor 16 by the output of the full-wave rectifier circuit 15. To do. This output is supplied to the switching transformer 17 and the switching transistor 18.

  At the same time, the reference signal Vref shown in FIG. 4D is input to the control circuit 44 as the control signal Vcont shown in FIG. As a result, the control circuit 44 starts driving, and the switching transformer 17 is driven to switch when the switching transistor 18 is turned on and off by the control circuit 44. When the switching transistor 18 is turned on, a current is passed through the primary winding 17a of the switching transformer 17. The energy is stored, and when the switching transistor 18 is turned off, the energy stored in the primary winding 17a is released through the secondary winding 17b. As a result, a direct current output is generated via the rectifying and smoothing circuit 25, and the light emitting diodes 26 to 29 are turned on by the direct current output. In this case, the light emitting diodes 26 to 29 are turned on with the minimum light amount by the reference signal Vref.

  On the other hand, when an output is generated at the tertiary winding 17 c of the switching transformer 17, a DC output is generated at both ends of the capacitor 31 via the diode 30. As a result, an output is generated at a connection point between the capacitor 36 and the resistor 37 constituting the differentiation circuit for a predetermined time T, and the transistor 39 is turned on during this time.

  Further, when a dimming signal is generated from a dimming signal generation unit (not shown) after the lighting device is turned on by the switch operation of the dimming operation unit 34 described above, for example, the ripple current smoothing capacitor 16 shown in FIG. When the dimming signal (VDIM) is generated at the connection point a between the resistor 32 and the phototransistor 332 after the delay time TD as shown in FIG. VDIM) tries to generate a dimming output (Vdet) at the connection point b between the resistor 41 and the capacitor 42. However, in this case, since the transistor 39 is on for a predetermined time T, the dimming output (Vdet) is canceled during this time (see FIG. 4C), and no dimming output is generated from the operational amplifier 40. Thereby, the light emitting diodes 26 to 29 are turned on with the minimum light amount by the operation of the control circuit 44 to which the reference signal Vref is given.

  Thereafter, when a predetermined time T elapses, the output of the connection point between the capacitor 36 and the resistor 37 is lost, and the transistor 39 is turned off. Then, a dimming output (Vdet) is generated at the connection point b between the resistor 41 and the capacitor 42 by the dimming signal (VDIM) at the connection point a between the resistor 32 and the phototransistor 332 (see FIG. 4C). Is generated via the operational amplifier 40. In this case, since the dimming output (Vdet) is larger than the reference signal Vref shown in FIG. 4D, this dimming output (Vdet) is input to the control circuit 44 this time. Thereby, the light emitting diodes 26 to 29 are turned on by the light amount corresponding to the dimming output (Vdet) by the operation of the control circuit 44.

Therefore, in this way, the dimming signal is canceled for a predetermined time T immediately after the power is turned on, and the light emitting diodes 26 to 29 are turned on with a predetermined light amount (for example, the minimum light amount). The light emitting diodes 26 to 29 are turned on with the light quantity indicated by the dimming signal after canceling the above. As a result, the influence of the dimming signal can be reliably eliminated for a predetermined time T immediately after the power is turned on. It is possible to obtain a lighting state with no sense of incongruity as a lighting fixture, and to improve the merchantability.
(Modification 1)

In the above-described embodiment, the light emitting diodes 26 to 29 are turned on with a predetermined light amount (for example, the minimum light amount) for a predetermined time T immediately after the power is turned on, and the light emitting diode 26 has a light amount indicated by the dimming signal after the predetermined time T has elapsed. However, if the level of the reference signal Vref is further reduced to a signal level at which the light emitting diodes 26 to 29 cannot be turned on (a level at which only the operation of the control circuit 44 is possible), The light emitting diodes 26 to 29 can be turned off for a predetermined time T immediately after the power is turned on, and the light emitting diodes 26 to 29 can be turned on with the light intensity indicated by the dimming signal after the predetermined time T has elapsed.
(Modification 2)

Further, if the setting level of the reference signal Vref can be varied, it is possible to provide a dimming function capable of arbitrarily adjusting the light amounts of the light emitting diodes 26 to 29 that are turned on at a predetermined time T immediately after the power is turned on.
(Modification 3)

Furthermore, the time constant by the resistor 41 and the capacitor 42 is set large, and the dimming signal output to the connection point b between the resistor 41 and the capacitor 42 by the dimming signal (VDIM) at the connection point a between the resistor 32 and the phototransistor 332. If the dimming output (Vdet) reaches the minimum level required for lighting the light emitting diodes 26 to 29 after the predetermined time T has elapsed in the process of increasing the output (Vdet), then The brightness of the light emitting diodes 26 to 29 can be faded in by the control signal Vcont accompanying the increase in the dimming output (Vdet). In this case, the series circuit of the capacitor 36 and the resistor 37 and the transistor 39 constituting the circuit for canceling the dimming signal can be omitted.
(Second Embodiment)

  Next, a second embodiment of the present invention will be described.

  FIG. 5 is a diagram showing only the main part of the schematic configuration of the second embodiment of the present invention, and the same parts as those in FIG.

  In this case, a series circuit of a capacitor 51 and a resistor 52 is connected to a connection point between the positive electrode output terminal of the full-wave rectifier circuit 15 and the ripple current smoothing capacitor 16. The series circuit of the capacitor 51 and the resistor 52 constitutes a differentiation circuit, and an output is generated at the connection point between the capacitor 51 and the resistor 52 for a predetermined time by the output of the ripple current smoothing capacitor 16. The base of the transistor 53 is connected to the connection point between the capacitor 51 and the resistor 52. The transistor 53 has an emitter grounded and a collector connected to the capacitor 36, and is turned on for a predetermined time by an output generated at a connection point between the capacitor 51 and the resistor 52.

  In this way, when the lighting apparatus is turned on, the AC power of the AC power supply 11 is supplied to the full-wave rectifier circuit 15, and when the output of the ripple current smoothing capacitor 16 is generated by the output of the full-wave rectifier circuit 15, An output is generated at the connection point of the resistor 52 for a predetermined time, and the transistor 53 is turned on during this time. As a result, the residual charge of the capacitor 36 is forcibly discharged in the direction indicated by the arrow d through the diode 38 and the transistor 53, and the differential circuit composed of the capacitor 36 and the resistor 37 is reset.

  In this way, since the differentiation circuit composed of the capacitor 36 and the resistor 37 is forcibly reset immediately after the power is turned on, the predetermined time T by the differentiation circuit of the capacitor 36 and the resistor 37 is accurately set. Therefore, it is possible to stably obtain an operation for canceling the dimming signal for a predetermined time T immediately after the power is turned on.

  In the above-described embodiment, immediately after the power is turned on, the differential circuit composed of the capacitor 36 and the resistor 37 is forcibly reset. Such an operation is performed when the power is turned off or when the external signal is turned off. You may make it carry out.

  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 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. 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, in the above-described embodiment, an example of an analog circuit has been described. However, a control method using a microcomputer or digital processing can also be adopted.

  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.

DESCRIPTION OF SYMBOLS 1 ... Instrument body, 2 ... Light source part, 2a ... LED, 3 ... Power supply room, 5 ... Power supply terminal room, 11 ... AC power supply, 15 ... Full wave rectifier circuit, 16 ... Ripple current smoothing capacitor, 17 ... Switching transformer, DESCRIPTION OF SYMBOLS 18 ... Switching transistor, 22 ... Snubber circuit, 25 ... Rectification smoothing circuit, 26-29 ... Light emitting diode, 31 ... Capacitor, 33 ... Photocoupler, 34 ... Dimming operation part, 36 ... Capacitor, 37 ... Resistance, 38 ... Diode , 39 ... transistor, 40 ... op amp, 41 ... resistor, 42 ... capacitor, 44 ... control circuit, 51 ... capacitor, 52 ... resistor, 53 ... transistor

Claims (1)

A dimming means comprising a dimming operation unit and a dimming signal generation unit that generates a dimming signal by operating the dimming operation unit;
The dimming signal from the dimming means and the DC output generation means, the power supply device from the at least immediately after power is turned on to output the DC power in response to the dimming signal from the dimming signal generating unit of the light control means There until output controls the DC output generation means to the semiconductor light emitting element is turned off, after the output of the dimming signal from the dimming means, the DC output generated in response to the dimming signal a power supply device and a control means for starting the lighting control of the semiconductor light emitting element by controlling the DC power output from the means according to the dimming signal;
A semiconductor light emitting element to which the DC power output from the DC output generating means of the power supply device is supplied;
The DC output generating means of the power supply device starts driving immediately after the power is turned on to supply an output that cannot be turned on to the semiconductor light emitting element, and the brightness fades in. The lighting fixture dimming system characterized by starting lighting control of the semiconductor light emitting element .

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