JP6613751B2 - Lighting system - Google Patents

Description

  Embodiments described herein relate generally to a lighting system.

The lighting system performs dimming control and extinguishing control for the purpose of energy saving, comfort and performance. There are various methods depending on the application. For example, in a large-scale facility such as an office or a store, a four-wire dimming method in which a power supply cable and a dimming signal line are independent is often used. On the other hand, what is designed assuming that an incandescent bulb is attached is mainly one that realizes dimming by adjusting the effective voltage value applied to the incandescent bulb by phase control. Since this illumination system can supply power and control light using two power wires, the power supply wiring is simple.
In recent years, a light-emitting LED (Light Emitting Diode: LED) with a base similar to an incandescent lamp is widely used in the power receiving unit. However, when combined with an existing phase dimming lighting system, there is a difference in electrical characteristics. As a result, it is difficult to operate stably up to a low luminous flux region as with incandescent bulbs. In addition, because it is not easy to replace existing wiring and wiring fixtures and change to other methods, LED lighting devices such as bulb-type LED lamps can be dimmed in the same way as incandescent light bulbs using existing wiring equipment. There is a need for a system that can do this.

Japanese Patent Laying-Open No. 2015-65772

  In order to solve the above-described problems, an illumination system capable of dimming a lighting device by utilizing existing phase dimming wiring equipment is provided.

  According to the embodiment, the lighting system includes a converter and a lighting device. The converter includes a first conversion unit, a second conversion unit, and a first connection unit. The first conversion unit converts an AC voltage into a DC voltage. A 2nd conversion part converts the said DC voltage which the said 1st conversion part converted into the DC voltage of the voltage value based on the light control signal which shows light quantity. The first connection unit outputs the DC voltage converted by the second conversion unit. The illumination device includes a second connection unit, a measurement unit, a third conversion unit, and an illumination load. The second connection portion is connected to the first connection portion. The measurement unit measures a voltage value of a DC voltage applied to the second connection unit. The third conversion unit converts the DC voltage applied to the second connection unit into a DC current corresponding to the voltage value measured by the measurement unit. The illumination load emits light by the direct current converted by the third conversion unit.

  According to the present invention, it is possible to provide an illumination system capable of dimming the illumination device using existing facilities.

FIG. 1 is a diagram illustrating a configuration example of a lighting system according to the first embodiment. FIG. 2 is a circuit diagram illustrating a configuration example of the AC / DC converter according to the first embodiment. FIG. 3 is a circuit diagram illustrating a configuration example of the DC / DC converter according to the first embodiment. FIG. 4 is a diagram illustrating a configuration example of the contact according to the first embodiment. FIG. 5 is a diagram illustrating a configuration example of an illumination system according to the second embodiment. FIG. 6 is a diagram illustrating a configuration example of an illumination system according to the third embodiment. FIG. 7 is a circuit diagram illustrating a configuration example of an AC / DC converter according to the third embodiment. FIG. 8 is a diagram illustrating a configuration example of the LED illumination according to the fourth embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
The illumination system 100, 100a, 100b, or 100c according to the embodiment described below includes a converter and the illumination device 10 or 10c. The converter includes a first conversion unit that converts an AC voltage into a DC voltage, and a second voltage that converts the DC voltage converted by the first conversion unit into a DC voltage having a voltage value based on a dimming signal indicating the amount of light. And a first connection unit that outputs the DC voltage converted by the second conversion unit, and the lighting device 10 is connected to the first connection unit by a second connection. A measurement unit that measures the voltage value of the DC voltage applied to the second connection unit, and the DC voltage applied to the second connection unit according to the voltage value measured by the measurement unit A third converter that converts the current into a direct current; and an illumination load 4 that emits light by the direct current converted by the third converter.

  The third conversion unit according to an embodiment described below includes at least one semiconductor switch and a drive circuit 36 that performs on / off control of the semiconductor switch based on the voltage value measured by the measurement unit. A current is supplied to the lighting load by an on / off operation of the semiconductor switch.

  The lighting system 100, 100a, 100b or 100c according to the embodiment described below includes a first control unit for determining a current output from the third conversion unit to the lighting load based on the voltage value. The drive circuit 36 performs on / off control of the semiconductor switch based on the output of the first control unit.

  The second conversion unit according to the embodiment described below converts the DC voltage converted by the first conversion unit based on an adjustment signal for correcting the DC voltage.

  The adjustment signal according to the embodiment described below corrects the DC voltage based on the variation or fluctuation of the voltage input to the third conversion unit due to the usage environment or individual differences of parts.

  The second conversion unit according to the embodiment described below connects a variable resistor that changes its own resistance based on the adjustment signal, the variable resistor to an input terminal, and outputs a third control voltage. A second operational amplifier, and the second converter converts the DC voltage converted by the first converter based on the third control voltage.

  The illumination system 100, 100 a, 100 b, or 100 c according to the embodiment described below includes an output adjustment device 6. The output adjustment device 6 outputs the adjustment signal.

  The illumination system 100, 100a, 100b or 100c according to the embodiment described below includes a rectifier circuit 71. The rectifier circuit 71 rectifies the DC voltage applied to the second connection unit and outputs the rectified voltage to the measurement unit and the third conversion unit.

The first connection part according to the embodiment described below is a socket.
The illumination system 100, 100a, 100b, or 100c according to the embodiment described below includes a light control device 5. The light control device 5 outputs the light control signal.

The said illumination load 4 which concerns on embodiment described below is comprised from LED.
(First embodiment)
FIG. 1 is a diagram illustrating a configuration example of a lighting system 100 according to the first embodiment.
The illumination system 100 includes an AC / DC converter 2 that converts an AC voltage from an AC power source into a DC voltage, and an illumination device 10 that causes the illumination load 4 to emit light using the DC voltage from the AC / DC converter 2. . The lighting device 10 converts the input DC voltage into a DC current having a value to be supplied to the lighting load 4, and supplies it to the lighting load 4. For example, the illumination load 4 is a light emitting diode (LED), and the illumination device 10 is an LED bulb or a fluorescent LED lamp. The illumination system 100 has a function of dimming the illumination load 4 based on a signal from the dimmer 5.

  As shown in FIG. 1, the lighting system 100 includes an AC power supply 1, an AC / DC converter 2, a DC / DC converter 3, a lighting load 4, a dimming device 5, and the like. The AC / DC converter 2 and the DC / DC converter 3 connect the contact 51 and the contact 52, and connect the contact 53 and the contact 54. The contact 51 and the contact 53 (first connection portion) are connection portions on the AC / DC converter 2 side. The contact 52 and the contact 54 (second connection portion) are connection portions on the DC / DC converter 3 side. The DC / DC converter 3, the illumination load 4, the contact 52, the contact 54, and the like constitute the illumination device 10. The lighting device 10 can be detached from the contact point 51 and the contact point 53.

  Here, the DC voltage output from the AC / DC converter 2 is defined as the DC voltage VDC. In addition, a voltage output from the DC / DC converter 3 of the lighting device 10 (that is, a voltage applied to the lighting load 4) is a DC voltage VF. Further, the current flowing through the lighting load 4 is IF.

  The AC power supply 1 supplies an AC voltage. For example, the AC power source 1 is a commercial power source. For example, the AC power supply 1 is 100 V and supplies an AC voltage that is 50 Hz or 60 Hz. The AC power supply 1 supplies an AC voltage to the AC / DC converter 2.

  The AC / DC converter 2 converts the AC voltage supplied from the AC power source 1 into a DC voltage (first DC voltage). Further, the AC / DC converter 2 uses a DC voltage VDC (second DC voltage) having a voltage value set based on a dimming signal (Dimmer signal) transmitted from the dimming device 5 by using a DC voltage obtained from the AC voltage. ) Is output. That is, the AC / DC converter 2 outputs a DC voltage VDC having a voltage value based on the dimming signal. The AC / DC converter 2 applies a DC voltage VDC to the DC / DC converter 3.

  The DC / DC converter 3 sets the current value of the DC current IF to be output based on the voltage value of the voltage VDC (second DC voltage) between the contact 52 and the contact 54, and sets the input DC voltage VDC. Is converted into a direct current IF of the current value. In other words, the DC / DC converter 3 outputs the set current value IF based on the voltage value of the voltage between the contact 52 and the contact 54. The DC / DC converter 3 is electrically connected to the lighting load 4. The DC / DC converter 3 supplies the current IF to the lighting load 4.

  The illumination load 4 emits light by the supplied current. Here, the illumination load 4 emits light by the current IF flowing by the DC voltage VDC applied by the DC / DC converter 3. For example, the illumination load 4 is a light emitting diode (LED) that emits light by the supplied current IF. Moreover, the illumination load 4 may be comprised from several LED.

The light control device 5 outputs a light control signal indicating the amount of light emitted by the illumination load 4. For example, the operator performs an operation of designating the amount of light to be dimmed with a dial or an input button. The light control device 5 acquires the input amount input by the operation of the operator. For example, the light control device 5 outputs a light control signal indicating the amount of light corresponding to the input amount input by the operation of the operator. The dimmer 5 is electrically connected to the AC / DC converter 2. The dimming device 5 transmits the dimming signal to the AC / DC converter 2.
The power line 7 is disposed, for example, on the back of the wall or the ceiling, and connects the AC / DC converter 2 with the contact 51 and the contact 53 (first connection portion).

  Note that the lighting system 100 may include necessary elements as appropriate.

Next, the AC / DC converter 2 will be described.
FIG. 2 is a circuit diagram illustrating a configuration example of the AC / DC converter 2.
As shown in FIG. 2, the AC / DC converter 2 includes a rectifier circuit 11, an inductor 12, a semiconductor switch 13, a diode 14, a capacitor 15, a photocoupler light receiving element 16, a control circuit 17, a semiconductor switch 18, a transformer 19, and a diode 20. , A capacitor 21, a photocoupler light emitting element 22, an operational amplifier 23 (second operational amplifier), a DC variable power supply 24, a resistor 25, a resistor 26, and the like.

  The inductor 12, the semiconductor switch 13, the diode 14, the capacitor 15, and the like constitute the PFC 201. The rectifier circuit 11, the PFC 201, and the like constitute an AC / DC converter 202 (first conversion unit). Further, the photocoupler light receiving element 16, the control circuit 17, the semiconductor switch 18, the transformer 19, the diode 20, the capacitor 21, the photocoupler light emitting element 22, the operational amplifier 23, the DC variable power supply 24, the resistor 25, the resistor 26, and the like are DC / DC. A converter 203 (second conversion unit) is formed.

The semiconductor switch 13 and the semiconductor switch 18 are, for example, nMOS-FETs. The photocoupler light receiving element 16 and the photocoupler light emitting element 22 constitute a photocoupler. The photocoupler light receiving element 16 is, for example, a phototransistor. The photocoupler light emitting element 22 is, for example, an LED.
The AC / DC converter 202 converts the AC voltage output from the AC power source 1 into a DC voltage having a predetermined voltage value. Further, the DC / DC converter 203 converts the DC voltage output from the AC / DC converter 202 into the DC voltage VDC based on the dimming signal.

The rectifier circuit 11 is connected to the AC power source 1. The terminal from which the current of the rectifier circuit 11 flows is connected to one end of the inductor 12. The terminal on the side where the current of the rectifier circuit 11 flows is connected to the source of the semiconductor switch 13. The other end of the inductor 12 is connected to the drain of the semiconductor switch 13. The other end of the inductor 12 and the drain of the semiconductor switch 13 are connected to the anode of the diode 14.
The capacitor 15 is connected in parallel with the semiconductor switch 13. One end of the capacitor 15 is connected to the cathode of the diode 14. The other end of the capacitor 15 is connected to the source of the semiconductor switch 13.

  The emitter of the photocoupler light receiving element 16 is connected to the other end of the capacitor 15. The collector of the photocoupler light receiving element 16 is connected to the control circuit 17. The control circuit 17 is connected to the gate of the semiconductor switch 18. The cathode of the diode 14 is connected to one end on the primary side of the transformer 19. The other end of the primary side of the transformer 19 is connected to the drain of the semiconductor switch 18. The source of the semiconductor switch 18 is connected to the emitter of the photocoupler light receiving element 16.

One end of the secondary side of the transformer 19 is connected to the anode of the diode 20. The cathode of the diode 20 is connected to one end of the capacitor 21. The other end of the secondary side of the transformer 19 is connected to the other end of the capacitor 21.
One end of the capacitor 21 is connected to the anode of the photocoupler light emitting element 22. The cathode of the photocoupler light emitting element 22 is connected to the output terminal of the operational amplifier. The other end of the capacitor 21 is connected to the negative electrode of the DC variable power source 24.

  The resistor 25 and the resistor 26 are connected in series. The resistor 25 and the resistor 26 are connected in parallel with the capacitor 21. One end of the resistor 25 is connected to the anode of the photocoupler light emitting element 22. The other end of the resistor 25 is connected to one end of the resistor 26. The other end of the resistor 26 is connected to the negative electrode of the DC variable power source 24.

  The positive electrode of the DC variable power supply 24 is connected to the non-inverting input terminal of the operational amplifier 23. The inverting input terminal of the operational amplifier 23 is connected to the other end of the resistor 25 and one end of the resistor 26. One end of the resistor 25 is connected to the power supply line 7 and the contact 51 through the first output unit 51a, and the other end of the resistor 26 is connected to the power supply line 7 and the contact 53 through the second output unit 53a. The The direct-current variable power supply 24 is connected to the light control device 5.

  The control circuit 17 performs on / off control of the semiconductor switch 18. For example, the control circuit 17 turns on / off the semiconductor switch 18 so that a predetermined voltage is generated on the secondary side of the transformer 19.

  The DC variable power supply 24 receives a dimming signal from the dimming device 5. The DC variable power supply 24 applies a voltage to the non-inverting terminal of the operational amplifier 23 based on the dimming signal. That is, the direct-current variable power supply 24 applies a voltage to the non-inverting terminal of the operational amplifier 23 so that the direct-current voltage VDC indicates the light amount of the dimming signal. For example, the DC variable power supply 24 applies a higher voltage to the non-inverting terminal of the operational amplifier 23 as the light amount indicated by the dimming signal is larger. For example, the direct-current variable power supply 24 applies a voltage to the non-inverting terminal of the operational amplifier 23 so that the direct-current voltage VDC indicates the light amount of the dimming signal at a gradation between 40V and 80V.

Next, the DC / DC converter 3 will be described.
FIG. 3 is a circuit diagram illustrating a configuration example of the DC / DC converter 3.
As shown in FIG. 3, the DC / DC converter 3 includes a resistor 31, a voltage controller 32 as a first controller, a capacitor 33, a semiconductor switch 34, a diode 35, a drive circuit 36, an inductor 37, a capacitor 38, and an operational amplifier. 39 (first operational amplifier), a DC variable power supply 40, a resistor 41, and the like.

  The semiconductor switch 34, the drive circuit 36, the inductor 37, the capacitor 38, the operational amplifier 39, the DC variable power source 40, and the resistor 41 constitute a voltage conversion unit (third conversion unit). The inductor 37, the capacitor 38, and the like constitute a smoothing circuit.

The semiconductor switch 34 is, for example, an nMOS-FET.
The contact 52 is connected to one end of the resistor 31. The other end of the resistor 31 is connected to the voltage control unit 32. The voltage control unit 32 is connected to the DC variable power supply 40. One end of the resistor 31 is connected to one end of the capacitor 33. The contact 54 is connected to the other end of the capacitor 33. The other end of the capacitor 33 is grounded.

  One end of the capacitor 33 is connected to the drain of the semiconductor switch 34. The gate of the semiconductor switch 34 is connected to the drive circuit 36. The source of the semiconductor switch 34 is connected to the cathode of the diode 35. That is, the semiconductor switch 34 is connected in series between the contact 52 and the contact 54 and the illumination load 4.

  The anode of the diode 35 is connected to the other end of the capacitor 33. The cathode of the diode 35 and the source of the semiconductor switch 34 are connected to one end of the inductor 37. The capacitor 38 is connected to the diode 35 in parallel. The other end of the inductor 37 is connected to one end of the capacitor 38. The other end of the capacitor 38 is connected to the anode of the diode 35.

The other end of the capacitor 38 is connected to one end of the resistor 41. The other end of the resistor 41 is connected to the inverting input terminal of the operational amplifier 39. The non-inverting input terminal of the operational amplifier 39 is connected to the positive electrode of the DC variable power supply 40. The negative electrode of the DC variable power supply 40 is grounded. The output terminal of the operational amplifier 39 is connected to the drive circuit 36.
The illumination load 4 is connected in parallel with the capacitor 38. One end of the capacitor 38 is connected to the anode of the LED of the illumination load 4. The cathode of the LED of the illumination load 4 is connected to the other end of the resistor 41 and the inverting input terminal of the operational amplifier 39.

  The drive circuit 36 performs on / off control of the semiconductor switch 34 based on the output voltage (second control voltage) output from the output terminal of the operational amplifier 39. That is, the drive circuit 36 controls the semiconductor switch 34 so that a desired DC current IF is output. For example, the drive circuit 36 compares the output voltage of the voltage control unit 32 input to the non-inverting terminal of the operational amplifier 39 with the output current detection signal voltage input to the inverting terminal, and outputs the output current of the third conversion unit. The IF is controlled to have a desired current.

  In addition, the drive circuit 36 may include a semiconductor switch 34 on-time table corresponding to the output voltage of the voltage control unit 32. In this case, the drive circuit 36 controls the semiconductor switch 34 according to the table. For example, the drive circuit 36 may increase the on-duty as the output voltage of the voltage control unit 32 increases. That is, the DC current IF increases as the output voltage of the operational amplifier 39 increases.

The DC variable power supply 40 applies a voltage (first control voltage) to the non-inverting input terminal of the operational amplifier 39 in accordance with a control signal from the voltage control unit 32.
The voltage control unit 32 controls the voltage output from the DC variable power supply 40 based on the voltage generated between the contact 52 and the contact 54. The voltage control unit 32 measures the voltage value of the voltage generated between the contact 52 and the contact 54 (measurement unit). For example, the voltage control unit 32 measures the voltage value of the voltage generated between the contact 52 and the contact 54 using the resistor 31.

The voltage control unit 32 controls the voltage output from the DC variable power supply 40 based on the measured voltage value. That is, the voltage control unit 32 controls the voltage output from the DC variable power supply 40 so that the illumination load 4 emits the amount of light indicated by the measured voltage value.
For example, the voltage control unit 32 determines the necessary current IF from the measured voltage value. The voltage control unit 32 instructs the voltage of the DC variable power supply 40 corresponding to the necessary current IF, and the drive circuit 36 controls the semiconductor switch 34.

  The voltage control unit 32 determines a voltage output from the DC variable power supply 40 that is input to the non-inverting terminal of the operational amplifier 39. For example, the voltage control unit 32 may include a table indicating a control signal corresponding to the measured voltage value. In this case, the voltage control unit 32 may generate a control signal according to the table using, for example, a microcomputer. Thereby, it is possible to have an arbitrary output characteristic with respect to a voltage (that is, VDC) generated between the contact 52 and the contact 54.

Next, the contact 51 and the contact 53 will be described.
FIG. 4 is a cross-sectional view of a light bulb base showing a configuration example of the contact 51 and the contact 53.
As shown in FIG. 4, the contact 53 is formed of a conductive material such as metal. The contact 53 is formed in a socket shape. For example, the contact 53 is formed in a columnar shape so that its diameter decreases as it goes to the bottom. A spiral groove 61 is formed inside the contact 53. The groove 61 fixes a contact 54 formed so as to match the groove 61. For example, the contact 53 is fixed while the contact 54 is connected while rotating.

The contact 51 is formed from a conductive material such as metal. The contact 51 is formed in a rod shape. For example, the contact 51 may have a tip and bend. The contact 51 is fixed to the contact 53 via the insulating member 62. For example, the insulating member 62 is formed so as to cover the contact 51, and the insulating member 62 and the contact 53 are fixed.
The structures of the contact 51 and the contact 53 are not limited to a specific structure.

Next, an operation example of the illumination system 100 will be described.
First, an operation example of the AC / DC converter 2 will be described.
The AC / DC converter 2 converts the AC voltage output from the AC power source 1 into a DC voltage having a predetermined voltage through the AC / DC converter 202 or the like.
The control circuit 17 controls on / off of the semiconductor switch 18 to control the time for applying the converted DC voltage to the primary side of the transformer 19. The control circuit 17 performs on / off control of the semiconductor switch 18 so that a predetermined voltage is generated on the secondary side of the transformer 19.

A predetermined voltage is generated on the secondary side of the transformer 19 by the on / off control of the control circuit 17. The voltage generated on the secondary side of the transformer 19 is rectified and smoothed by the diode 20 and the capacitor 21.
The photocoupler light emitting element 22, the operational amplifier 23, the DC variable power supply 24, the resistor 25, and the resistor 26 output a DC voltage VDC based on the dimming signal. The DC variable power supply 24 outputs a voltage input to the non-inverting input terminal of the operational amplifier 23 based on the dimming signal.

  When the DC variable power supply 24 outputs a voltage to the non-inverting input terminal of the operational amplifier 23, the operational amplifier 23 compares the result with the detection voltage input to the inverting input terminal. By feeding back to the control circuit 17 via the element 16, the DC voltage VDC is controlled to a desired voltage. Therefore, the DC voltage VDC is controlled to a voltage corresponding to the dimming signal.

Next, an operation example of the DC / DC converter 3 will be described.
The voltage control unit 32 measures the voltage value of the voltage generated between the contact 52 and the contact 54 using the resistor 31. The voltage control unit 32 transmits a control signal to the DC variable power supply 40 based on the measured voltage value. That is, the voltage control unit 32 controls the voltage output from the DC variable power supply 40 so that the illumination load 4 emits a light amount corresponding to the measured voltage value.

The DC variable power supply 40 outputs a voltage to the non-inverting input terminal of the operational amplifier 39 based on the control signal. When the DC variable power supply 40 outputs a voltage to the non-inverting input terminal of the operational amplifier 39, the operational amplifier 39 compares it with the detection voltage of the output current input to the inverting input terminal and feeds back the result to the drive circuit 36. By controlling the on-duty of the semiconductor switch 34, the output current of the DC / DC converter can be controlled to a desired current.
The inductor 37 and the capacitor 38 (smoothing circuit) smooth the output voltage of the converter and suppress the ripple of the direct current flowing through the lighting load 4.
The illumination load 4 determines the light emission amount according to the current IF output from the DC / DC converter.

  The illumination system 100 configured as described above can output the DC voltage VDC from the AC / DC converter 2 in accordance with the amount of light indicated by the dimming signal. In other words, the illumination system 100 can output the DC voltage VDC whose voltage value indicates the light amount of the dimming signal.

  The lighting system 100 can output the current IF from the DC / DC converter 3 based on the voltage value input from the AC / DC converter 2. That is, the illumination system 100 can control the dimming by outputting the current IF that emits the light amount indicated by the dimming signal by the lighting device 10. At the same time, the lighting system can supply the necessary power to the lighting load 4 using the DC voltage VDC.

Therefore, the lighting system 100 can perform dimming and power supply of the lighting device 10 using the two power supply lines 7 that connect the AC / DC converter 2 and the lighting device 10.
According to the above embodiment, the lighting system dims the lighting load according to the input operation even when the lighting device such as the LED bulb is attached to the socket capable of dimming the incandescent bulb. The lighting load can be dimmed with the same operation feeling as an incandescent light bulb.
(Second Embodiment)
Next, an illumination system according to the second embodiment will be described.
The illumination system 100a according to the second embodiment is different from the illumination system 100 according to the first embodiment in that the AC / DC converter 2 includes a light control device 5. Accordingly, the other portions are denoted by the same reference numerals and detailed description thereof is omitted.

FIG. 5 is a block diagram illustrating a configuration example of the illumination system 100a according to the second embodiment.
As shown in FIG. 5, the AC / DC converter 2 includes a light control device 5. For example, the light control device 5 is formed as a part of the circuit board of the AC / DC converter 2.
The illumination system according to the second embodiment configured as described above can generate a dimming signal inside the AC / DC converter.
(Third embodiment)
Next, an illumination system 100b according to the third embodiment will be described.
The illumination system 100b according to the third embodiment is different from the illumination system 100 according to the first embodiment in that the output adjustment device 6 is provided. Accordingly, the other portions are denoted by the same reference numerals and detailed description thereof is omitted.

FIG. 6 is a block diagram illustrating a configuration example of the illumination system 100b according to the third embodiment.
As illustrated in FIG. 6, the illumination system 100 b further includes an output adjustment device 6. Here, the voltage input to the DC / DC converter 3 is defined as a DC voltage VDC ′.

  The output adjustment device 6 transmits an adjustment signal for adjusting the DC voltage VDC to the AC / DC converter 2. The output adjusting device 6 adjusts the DC voltage VDC so that a desired DC voltage VDC ′ is applied to the DC / DC converter 3.

  A difference may occur between the direct-current voltage VDC and the direct-current voltage VDC ′ depending on the usage environment or circuit characteristics of the lighting system 100b. In such a case, the output adjustment device 6 corrects the DC voltage VDC so that the desired DC voltage VDC is applied to the DC / DC converter 3.

  For example, when the distance between the AC / DC converter 2 and the contacts 51 and 53 is relatively long, the DC voltage VDC 'is lower than the DC voltage VDC due to a voltage drop. In such a case, the output adjustment device 6 outputs an adjustment signal for correcting the DC voltage VDC so that the desired DC voltage VDC ′ is applied to the DC / DC converter 3. In other words, the adjustment signal corrects the direct-current voltage VDC based on voltage variations and fluctuations caused by individual differences in the use environment such as the distance between the AC / DC converter 2 and the contact 51 and the contact 53. For example, the output adjustment device 6 outputs an adjustment signal for increasing the DC voltage VDC.

  For example, the output adjustment device 6 may manually set the adjustment signal. For example, the output adjustment device 6 may accept an operator's operation input and set an adjustment signal according to the accepted operation.

The output adjustment device 6 may automatically set an adjustment signal. For example, the output adjustment device 6 may automatically set the adjustment signal according to the distance between the AC / DC converter 2, the contact 51 and the contact 52, and the contact 53 and the contact 55. In this case, the output adjustment device 6 may accept a distance input or may receive a signal indicating the distance from an external device.
The output adjustment device 6 may set an adjustment signal based on a signal from an external device.

Next, the AC / DC converter 2b used for the illumination system 100b will be described.
The AC / DC converter 2b according to the third embodiment is different from the AC / DC converter 2 according to the first embodiment in that the resistor 26 is replaced with a variable resistor 27. Accordingly, the other portions are denoted by the same reference numerals and detailed description thereof is omitted.

FIG. 7 is a circuit diagram showing a configuration example of the AC / DC converter 2b.
As shown in FIG. 7, the AC / DC converter 2 b includes a variable resistor 27 instead of the resistor 26.

  One end of the variable resistor 27 is connected to the other end of the resistor 25 and the inverting input terminal of the operational amplifier 23. The other end of the variable resistor 27 is connected between the negative electrode of the DC variable power supply 24 and the contact 53.

  The variable resistor 27 receives the adjustment signal from the output adjustment device 6. The variable resistor 27 controls its own resistance according to the adjustment signal.

Next, an operation example of the AC / DC converter 2b will be described.
The output adjustment device 6 transmits an adjustment signal for correcting the DC voltage VDC to the variable resistor 27.
The variable resistor 27 controls its own resistance according to the adjustment signal. When the resistance of the variable resistor 27 is controlled, the voltage applied to the non-inverting input terminal of the operational amplifier 23 is controlled. When the voltage applied to the non-inverting input terminal of the operational amplifier 23 is controlled, the DC voltage VDC is corrected by feedback control of the operational amplifier 23 based on this voltage.
Note that the illumination system 100b according to the third embodiment may include the features of the second embodiment.

  The illumination system according to the third embodiment configured as described above inputs an adjustment signal for correcting the DC voltage VDC so as to complement circuit characteristics and the like to the AC / DC converter. The AC / DC converter corrects the DC voltage VDC based on the adjustment signal. As a result, the lighting system can correct the DC voltage VDC based on the adjustment signal.

Therefore, the lighting system can output the DC voltage VDC so that the desired DC voltage VDC ′ is applied to the DC / DC converter. Therefore, the lighting system can complement the circuit characteristics of the lighting system and realize appropriate dimming.
(Fourth embodiment)
Next, an illumination system 100c according to the fourth embodiment will be described.
The illumination system 100c according to the fourth embodiment is different from the illumination system 100 according to the first embodiment in that the illumination device 10c includes a rectifier circuit 71. Accordingly, the other portions are denoted by the same reference numerals and detailed description thereof is omitted.

FIG. 8 is a block diagram illustrating a configuration example of the illumination system 100c according to the fourth embodiment.
As illustrated in FIG. 8, the lighting device 10 c further includes a rectifier circuit 71.
The rectifier circuit 71 connects the contact 52 and the contact 54 to the input terminal. The rectifier circuit 71 rectifies the voltage generated between the contact 52 and the contact 54 and outputs the rectified voltage to the DC / DC converter 3. That is, the rectifier circuit 71 is disposed between the contacts 52 and 54 and the input part of the DC / DC converter 3 and is connected so as to give the DC / DC converter 3 an appropriate polarity.
For example, even when the contacts 51 and 53 of the AC / DC converter 2 and the contacts 52 and 54 of the lighting device 10 are reversely connected, the DC / DC converter 3 operates properly by the rectifying action of the rectifier circuit 71. can do.
Note that the illumination system 100c according to the fourth embodiment may include the features of the illumination system according to the second embodiment or the third embodiment.

  The illumination system according to the fourth embodiment configured as described above can apply a voltage in a predetermined direction to the DC / DC converter even if a DC voltage is generated in the opposite direction at the contact of the illumination device. As a result, the lighting system can operate the DC / DC converter of the lighting device even if a DC voltage is generated in the opposite direction at the contact point of the lighting device. Therefore, the lighting system can operate the lighting device even when a reverse DC voltage VDC is applied to the contact of the lighting device due to a wiring mistake or the like.

  According to the embodiment described above, the lighting system can output the voltage of the voltage value based on the dimming signal from the AC / DC converter to the lighting device. Moreover, the illuminating device can set the voltage output to an illumination load so that the illumination load 4 may output the light quantity based on the voltage value of the input voltage. Therefore, the lighting system can dimm the lighting device by accepting an operation similar to that for dimming the heat-generating bulb.

In addition, the lighting system can perform power supply and dimming with two wires from the AC / DC converter to the lighting device.
As a result, the lighting system can dimm the lighting device using existing wiring equipment such as the two power lines 7.

  Moreover, although described as LED as a light emission light source in this text, solid light emitting devices, such as OLED (Organic EL; Organic Light Emitting Diode), are included.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... AC power source, 2, 2a and 2b ... AC / DC converter, 3 ... DC / DC converter, 4 ... Illumination load, 5 ... Dimming device, 6 ... Output adjustment device, 10 and 10c ... Illumination device, 11 and 71 ... Rectifier circuit, 12 and 37 ... Inductor, 13, 18 and 34 ... Semiconductor switch, 14, 20 and 35 ... Diode, 15, 21, 33 and 38 ... Capacitor, 16 ... Photocoupler light receiving element, 17 ... Control circuit, 19 DESCRIPTION OF SYMBOLS ... Transformer, 22 ... Photocoupler light emitting element, 23 and 39 ... Operational amplifier, 24 and 40 ... DC variable power supply, 25, 26, 31 and 41 ... Resistance, 27 ... Variable resistance, 32 ... Voltage control as a 1st control part 36, drive circuit, 51 to 54, contact point, 61, groove, 62, insulating member, 100, 100a, 100b and 100c, lighting system.

Claims (3)

A lighting system having a converter and a lighting device,
The converter is
A first converter that converts alternating voltage to direct voltage;
A second converter that converts the DC voltage converted by the first converter into a DC voltage having a voltage value based on a dimming signal indicating the amount of light;
A first connection unit that outputs the DC voltage converted by the second conversion unit;
The lighting device includes:
A second connecting portion connected to the first connecting portion;
A measurement unit that measures a voltage value of a DC voltage applied to the second connection unit, and generates a control signal based on the measured voltage value;
A third converter that converts the DC voltage applied to the second connection unit into a DC current based on the control signal generated by the measurement unit;
An illumination load that emits light by the direct current converted by the third conversion unit,
The second converter is
Based on the adjustment signal that corrects the DC voltage, a variable resistor that changes its resistance,
A second operational amplifier for connecting the variable resistor to an input terminal and outputting a third control voltage;
The second converter converts the DC voltage converted by the first converter based on the third control voltage,
The said control signal is an illumination system which controls a said 3rd conversion part so that the said illumination load light-emits the light quantity which the said measured voltage value shows. A lighting system having a converter and a lighting device,
The converter is
A first converter that converts alternating voltage to direct voltage;
A second converter that converts the DC voltage converted by the first converter into a DC voltage having a voltage value based on a dimming signal indicating the amount of light;
A first connection unit that outputs the DC voltage converted by the second conversion unit;
The lighting device includes:
A second connecting portion connected to the first connecting portion;
A measurement unit that measures a voltage value of a DC voltage applied to the second connection unit, and generates a control signal based on the measured voltage value;
A third converter that converts the DC voltage applied to the second connection unit into a DC current based on the control signal generated by the measurement unit;
An illumination load that emits light by the direct current converted by the third converter;
A rectifier circuit that rectifies the DC voltage applied to the second connection unit and outputs the rectified voltage to the measurement unit and the third conversion unit, and the control signal indicates the measured voltage value An illumination system that controls the third converter so that the illumination load emits light. The first connecting portion is a socket;
The illumination system according to claim 2 .