JP2016072189A - Light source device for illumination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device for illumination that does not need an external power source device and has a dimming function of an LED light source.SOLUTION: A light source device 100 for illumination has, in an electrical conduction portion of a circuit board 1, an AC-DC rectifying unit 10 for rectifying input AC to DC, a power source unit 20 that is electrically connected to an output portion of the AC-DC rectifying unit 10 and is contained as a part of the circuit of the circuit board 1, an LED light source 30 having plural LEDs, a voltage controller 40 which is interposed between the output portion of the power source unit 20 and the LED light source 30 and controls a voltage to be supplied to the LED light source, and a current adjusting unit 50 that is electrically connected to the output portion of the AC-DC rectifying unit 10 and adjusts a current value input to the LED light source.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an illumination light source device using a high-power LED light source having light emitting diodes (hereinafter referred to as “LEDs”) having different wavelengths as illumination light sources.

  In recent years, a plant growing apparatus as a so-called plant factory has attracted attention for the stable supply of plants such as fresh vegetables and fungal fruit bodies such as persimmons and the improvement of the self-sufficiency rate. The plant growing device realizes stable plant supply regardless of the season or the external environment by using artificial light as a light source.

  The development of light sources for plant growth has been remarkable, and it has become the mainstream to use LED light sources of a plurality of colors having different wavelengths in place of conventional fluorescent lamps and sodium lamps. As a technique related to a plant growth light source device using an LED light source, for example, a first light source that irradiates a plant with light having a first wavelength, and light having a wavelength different from that of the first light source according to the plant growth stage. A plant growth light source device comprising a second light source for irradiation is disclosed (see Patent Document 1).

JP 2011-97900 A

  However, the plant growing light source device of Patent Literature 1 requires an external power supply device having an AC-DC rectification function (see FIG. 2 of Patent Literature 1). The plant growing light source device of Patent Document 1 includes a connector in each light source unit, and a plurality of light source units share one external power supply device.

  However, the number of light source units that can be connected to one external power supply device is limited by the power consumption of the external power supply device. In addition, when a large number of light source units are arranged in the plant growing device, for example, a plurality of external power supply devices having a power consumption of about 320 W and a weight of about 1 to 2 kg are required, and not only wiring is complicated. The equipment cost was increasing.

  Further, in the plant growing light source device, it is necessary to adjust the light amount of the plant growing light source according to the type of plant to be grown. In particular, when a high-power LED light source with a high output of 1 W or more is used as a plant-growing light source, it is essential to have a dimming function because the light amount is large and the luminance is high. Therefore, development of a dimming circuit corresponding to a high power LED light source has been demanded.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an illumination light source device that does not require an external power supply and has a dimming function for adjusting the light amount of an LED light source.

  In order to achieve the above object, the illumination light source device according to the present invention includes at least an AC-DC rectification unit, a power supply unit, an LED light source, a voltage control unit, and a current adjustment unit in a conductive part of the circuit board. The AC-DC rectifier rectifies the input AC to DC. The power supply unit is electrically connected to the output unit of the AC-DC rectification unit and is built in as a part of the circuit of the circuit board. The LED light source has a plurality of LEDs. The voltage control unit is interposed between the output unit of the power supply unit and the LED light source, and controls a voltage supplied to the LED light source. The current adjustment unit is electrically connected to an output unit of the AC-DC rectification unit, and adjusts a current value input to the LED light source.

  In the illumination light source device, the power supply unit is preferably a constant current power supply circuit or a constant voltage power supply circuit.

  The LED light source preferably has a plurality of colors of LEDs with different wavelengths electrically connected in series and has an output of 1 W to 20 W / chip.

  The voltage control unit preferably includes a field effect element for controlling the output current by variable voltage and a voltage drop unit for dropping the voltage of the output current.

  The field effect element is preferably formed of a MOSFET, FET, or CMOS, and the voltage drop portion is preferably formed of a plurality of coils electrically connected in series.

  Furthermore, it is preferable that a dimming circuit unit for adjusting the light amount of the LED light source is electrically connected to the output unit of the power supply unit.

  The dimming circuit unit is preferably a variable resistor for variably operating a resistance value.

  The variable resistor preferably includes a pulse width modulation circuit section for transmitting a pulse width modulation signal and variably operating the resistance value of the variable resistor.

  And it is preferable that the output terminal is electrically connected to the input part of the said AC-DC rectification part.

  According to the illumination light source device of the present invention, since the power supply unit is built in as a part of the circuit board circuit, an external power supply device is unnecessary. Moreover, when the light control circuit part is provided, the outstanding effect that the light quantity of a LED light source can be adjusted is exhibited.

It is a circuit diagram of the light source device for illumination which concerns on this embodiment. It is a schematic diagram of the state which electrically connected multiple light source devices for illumination which concern on this embodiment.

The illumination light source according to the present embodiment will be described below with reference to the drawings. However, in the drawings, the same or similar reference numerals are given to the same or similar members and parts. Further, the drawings are schematically shown and do not necessarily match actual dimensions and ratios. Furthermore, the drawings may include portions having different dimensional relationships and ratios.
[Configuration of light source device for illumination]

  First, with reference to FIG. 1, the structure of the light source device for illumination which concerns on this embodiment is demonstrated. FIG. 1 is a circuit diagram of an illumination light source device according to this embodiment.

  As shown in FIG. 1, the illumination light source device 100 according to the present embodiment includes at least an AC-DC rectification unit 10, a power supply unit 20, an LED light source 30, a voltage control unit 40, and a conductive unit of the circuit board 1. A current adjustment unit 50 is included. Furthermore, the illumination light source device 100 according to the present embodiment includes a dimming circuit unit 60.

  Examples of the circuit board 1 include a general-purpose board such as an aluminum board, a copper board, a ceramic board, or a printed board, but a universal board can also be used, and is not limited to the illustrated board. For example, when the illumination light source device 100 according to the present embodiment is used for plant growth or a plant cultivation apparatus, the circuit board 1 exhibits a horizontally long rectangular shape or a strip-shaped outer shape according to the shape or size of the plant shelf. The substrate shape is not limited to the illustrated shape. When the illumination light source device 100 according to the present embodiment is used as a plant growing or plant cultivation light source device, it is preferable that the surface of the circuit board 1 is coated with a coating that reflects PPFD (photosynthesis effective photon flux density). Electronic components and circuits such as the AC-DC rectification unit 10, the power source unit 20, the LED light source 30, the voltage control unit 40, the current adjustment unit 50, and the dimming circuit unit 60 that constitute the illumination light source device 100 according to the present embodiment. Is mounted on the conductive portion of the circuit board 1.

  The AC-DC rectification unit 10 rectifies 100V to 240V alternating current (AC) input from the input terminals 11A and 11B into direct current (DC). This is because the LED light source 30 is basically DC driven. As the AC-DC rectifying unit 10 of the present embodiment, for example, as illustrated in FIG. 1, it is preferable to employ a diode bridge in which four diodes are combined. The diode bridge is a full-wave rectification circuit that clamps the negative amplitude of the input AC with a diode and inverts the negative waveform to perform DC rectification.

  Input terminals 11 </ b> A and 11 </ b> B for inputting AC power are electrically connected to the input section of the AC-DC rectifying section 10. One input terminal 11A or 11B is provided with a fuse 12 for protecting the electric circuit from a large current exceeding the rating. In addition, a capacitor 71 for smoothing the DC waveform is electrically connected in parallel to the output section of the AC-DC rectification section 10.

  In the present embodiment, a diode bridge that performs full waveform rectification is employed as the AC-DC rectification unit 10, but is not limited thereto, and a half rectifier circuit that clamps the negative amplitude of the input AC with a single diode is employed. It doesn't matter. When the capacitance of the capacitor 71 and the load are the same, the full-wave rectifier circuit can reduce ripple (ripple) as compared with the half-wave rectifier circuit.

  The input unit of the power supply unit 20 is electrically connected in parallel to the output unit of the AC-DC rectification unit 10. That is, the illumination power supply device 100 according to the present embodiment incorporates the power supply unit 10 as a part of the circuit of the circuit board 1.

  The power supply unit 20 includes a constant current power supply circuit with a constant output current and a constant voltage power supply circuit with a constant output voltage. For example, a constant current power supply circuit is preferably used for the power supply unit 20 of the present embodiment. This is because the constant current power supply circuit keeps the output current constant regardless of the internal impedance. In the present embodiment, a constant current power supply circuit capable of outputting a variable voltage of 100V to 240V is adopted as the power supply unit 20, but the present invention is not limited to this, and a constant voltage power supply circuit may be adopted. For example, a power supply chip IC is preferably used as the power supply unit 20, but is not limited to the power supply chip IC.

  In the LED light source 30, for example, LEDs 31 and 32 of a plurality of colors having different wavelengths are electrically connected in series. As the LED light source 30, it is preferable to employ a high power LED light source that has an output of 1 W to 20 W / chip and has a large amount of light and high luminance. The reason why the output is 1 W or more is that an LED having an output of 1 W / chip or more is generally called a high power LED. On the other hand, the output of 20 W or less is shown as a suitable upper limit because the current output of 20 W / chip or less is commercially available as a high power LED, and a high power LED exceeding 20 W is not necessarily used. It is not intended to be excluded. In the LED light source 30 of this embodiment, the LED 31 and the LED 32 are electrically connected in series via the resistor 53, but the number of LEDs connected in series is not limited to the illustrated number. Moreover, the case where LED31 and LED32 are electrically connected in parallel is not excluded.

  For example, when the LED light source 30 is used as a plant growth or plant cultivation light source, the combination of red (R) and blue (B) effective for photosynthesis, or the growth state of the plant is visually recognized by human eyes. White (W) which is easy to do. Wavelengths that are easily absorbed by chlorophyll involved in plant photosynthesis are about 450 nm and 660 nm. In addition, the red weak light reaction and the blue strong light reaction have wavelengths at which phytochrome involved in photomorphogenesis is likely to react. The red (R) LED has a light emission peak in a long wavelength range of 620 to 700 nm, for example. The blue (B) LED has an emission peak in a short wavelength region of 400 to 480 nm, for example. Currently, white (W) LEDs are mainly combined with blue (B) LEDs and phosphors, and the excitation wavelength is 450 nm (blue). Note that the color combinations of the LED light sources 30 exemplified in the present embodiment are examples and are not limited. For example, LEDs of a plurality of colors having different wavelengths can be arbitrarily combined. Moreover, the case where the LED light source 30 is a single color is not excluded.

  In the high power LED light source of the present embodiment, the drive voltage of the combination of red (R) and blue (B) is, for example, 9 R (2V) and 18V, and 3 B (3V) and 9V. For a total of 27V drive. The driving voltage of white (W) is, for example, W (3 V) × 12 and is 36 V driving.

  A voltage control unit 40 for controlling a voltage supplied to the LED light source 30 is interposed between the variable voltage output unit of the power source unit 20 and the LED light source 30. The voltage control unit 40 of the present embodiment is preferably composed of, for example, a field effect element 41 for controlling the output current by varying the voltage and a voltage drop unit 42 for dropping the output current. The voltage input unit of the field effect element 41 is electrically connected to the voltage output unit of the power supply unit 20.

  Examples of the field effect element 41 include a field effect transistor (FET), a metal oxide semiconductor field effect transistor (MOSFET) using a metal oxide film for insulating the gate (G), and a CMOS (Complementary MOS). ) And the like. The MOSFET includes a p-type P-channel MOSFET and an n-type N-channel MOSFET. CMOS includes both a PMOSFET and an NMOSFET in one circuit.

  In the present embodiment, for example, an N-channel MOSFET is preferably used as the field effect element 41, but is not limited to the N-channel MOSFET. The N-channel MOSFET is a semiconductor element having three terminals of a gate (G), a drain (D), and a source (S), and a current between D and S can be controlled by a voltage between G and S.

  The drain (D) of the field effect element 41 is electrically connected to the plus output of the AC-DC rectification unit 10 via the diode 81. The anode of the diode 81 is electrically connected to the drain (D) of the field effect element 41, and the cathode is electrically connected to the plus output of the AC-DC rectification unit 10. That is, the drain (D) of the field effect element 41 is electrically connected to the add of the LED light source 30 via the diode 81.

  Between the drain (D) of the field effect element 41 and the diode 81, the input part of the voltage drop part 42 is electrically connected. The voltage drop part 42 of this embodiment is comprised by the some coil (inductor), for example. The voltage drop unit 42 determines the set voltage by setting the number of coils electrically connected in series. The output unit of the voltage drop unit 42 is connected to the cathode of the LED light source 30.

  A plurality of capacitors 72 and 73 for stabilizing the DC voltage supplied to the LED light source 30 are electrically connected between the plus output of the AC-DC rectification unit 10 and the output units of the plurality of coils. . That is, the plurality of capacitors 72 and 73 are electrically connected to the LED light source 30 in parallel.

  Current adjustment for adjusting the current value input to the LED light source 30 between the negative output of the power supply unit 20 and the source (S) of the field effect element 41 and the negative output of the AC-DC rectification unit 10. The part 50 is electrically connected. The current adjustment unit 50 of the present embodiment is configured by, for example, three resistors 51A, 51B, and 51C electrically connected in parallel, but the number of resistors is not limited. In the present embodiment, the current value input to the LED light source 30 by the current adjusting unit 50 is set to 400 mA, for example. The set current value input to the LED light source 30, such as 350 mA or 450 mA, varies depending on the capacity and number of resistors of the current adjusting unit 50.

  A plus DIM terminal 61 </ b> A is electrically connected to the plus output of the AC-DC rectifying unit 10 via a resistor 52. On the other hand, a minus DIM terminal 61B is electrically connected to the minus output of the AC-DC rectifier 10. The dimming circuit unit 60 is electrically connected to the DIM terminal 61A and the DIM terminal 61B. In the present embodiment, the dimming circuit unit 60 is an optional component. The dimming circuit unit 60 of the present embodiment includes, for example, a variable resistor (not shown) for variably operating a resistance value. The light quantity of the LED light source 30 can be adjusted by manually operating the resistance value of the variable resistor. A capacitor 74 for stabilizing the DC voltage is electrically connected in parallel to the DIM terminals 61A and 61B.

  Further, for example, a pulse width modulation circuit unit (not shown) for transmitting a pulse width modulation (PWM) signal may be electrically connected to the variable resistor. When the pulse width modulation circuit unit is provided, the resistance value of the variable resistor can be variably operated by the pulse width modulation signal of the pulse width modulation circuit unit.

Output terminals 91A and 91B are electrically connected between the input terminal 11A and the fuse 12 and between the input terminal 11B and the negative output terminal of the AC-DC rectifier 10. Due to the presence of the output terminals 91A and 91B, a plurality of illumination light source devices 100 according to the present embodiment can be electrically connected. It does not matter whether the electrical connection between the illumination light source devices 100 according to the present embodiment is a series connection or a parallel connection.
[Operation of the light source device for illumination]

  Next, with reference to FIG. 1 and FIG. 2, the effect | action of the light source device for illumination which concerns on this embodiment is demonstrated. FIG. 2 is a schematic view of a state in which a plurality of illumination light source devices according to the present embodiment are electrically connected.

  As shown in FIG. 1, by connecting an AC power supply (not shown) to the input terminals 11A and 11B of the illumination light source device 100 according to the present embodiment, an alternating current (AC) of 100V to 240V is input. The alternating current (AC) input to the input terminals 11 </ b> A and 11 </ b> B is rectified into direct current (DC) by the alternating current-direct current rectifying unit 10. The AC-DC rectification unit 10 of the present embodiment is formed by, for example, a diode bridge as a full-wave rectification circuit. Therefore, the negative side amplitude of the input AC is clamped by the diode, and the negative side waveform is inverted. DC rectified.

  A fuse 12 is interposed between one input terminal 11A or 11B and the input section of the AC-DC rectifier section 10. When a large current exceeding the rating flows, the fuse 12 is blown and AC input is turned off. Cut off. Further, since the capacitor 71 is electrically connected in parallel to the output portion of the AC-DC rectification unit 10, the waveform converted to DC by the AC-DC rectification unit 10 can be smoothed.

  The input unit of the power supply unit 20 is electrically connected in parallel to the output unit of the AC-DC rectification unit 10. That is, the power supply unit 10 is built in as a part of the circuit of the circuit board 1. As the power supply unit 10, it is preferable to employ a constant current power supply circuit because the output current is kept constant regardless of the size of the internal impedance. The power supply unit 20 outputs a variable voltage in a voltage range of 100V to 240V, for example, while keeping the output current constant.

  A voltage control unit 40 is interposed between the voltage output unit of the power supply unit 20 and the LED light source 30. The voltage control unit 40 has a function of controlling the voltage supplied to the LED light source 30. The voltage control part 40 of this embodiment is comprised by the field effect element 41 and the voltage drop part 42, for example.

  The field effect element 41 is formed of a field effect transistor such as a MOSFET, FET, or CMOS, for example. According to a field effect transistor such as a MOSFET, FET, or CMOS, the output current can be easily controlled by varying the voltage. The voltage input unit of the field effect element 41 is electrically connected to the voltage output unit of the power supply unit 20. The drain (D) of the field effect element 41 is electrically connected to the plus output of the AC-DC rectification unit 10 via the diode 81. That is, the drain (D) of the field effect element 41 is electrically connected to the add of the LED light source 30 via the diode 81.

  On the other hand, the voltage drop unit 42 is formed by, for example, a plurality of coils (inductors) electrically connected in series, and drops the output current of the field effect element 41. The input part of the voltage drop part 42 is electrically connected between the drain (D) of the field effect element 41 and the diode 71. The output unit of the voltage drop unit 42 is connected to the cathode of the LED light source 30.

  That is, for example, when an N-channel MOSFET is employed as the field effect element 41 of the present embodiment, by inputting a variable voltage to the gate (G) of the N-channel MOSFET in the range of 100 V to 240 V from the power supply unit 10, The current between D and S can be controlled by changing the voltage between G and S. The output current input from the drain (D) of the N-channel MOSFET to the voltage control unit 42 is dropped by the voltage drop unit 42.

  The current adjustment unit 50 is electrically connected between the negative output of the power supply unit 20 and the source (S) of the field effect element 41 and the negative output of the AC-DC rectification unit 10. In the present embodiment, the current adjustment unit 50 sets the current value input to the LED light source 30 to, for example, 400 mA, but the set current value varies depending on the capacity and number of resistors.

  DIM terminals 61 </ b> A and 61 </ b> B are electrically connected to the output of the AC-DC rectifying unit 10. The DIM terminals 61A and 61B are electrically connected to a dimming circuit unit 60 as an optional component. The dimming circuit unit 60 of the present embodiment is composed of a variable resistor, and the light amount of the LED light source 30 can be adjusted by manually operating the resistance value of the variable resistor.

  Furthermore, if the pulse width modulation circuit unit is electrically connected to the variable resistor as the dimming circuit unit 60 of the present embodiment, the resistance value of the variable resistor is variably manipulated by the PWM signal of the pulse width modulation circuit unit. be able to. Therefore, the light amount of the LED light source 30 can be adjusted by operating the dimming circuit unit 60 by remote control.

  In the LED light source 30 of the present embodiment, LEDs 31 and 32 of a plurality of colors are electrically connected in series, have a high output of 1 W to 20 W / chip, a large amount of light, and a high luminance. Therefore, the light amount of the high power LED light source can be adjusted by the dimming circuit unit 60 of the present embodiment. In addition, since a plurality of capacitors 72 and 73 are electrically connected in parallel to the LED light source 30, the DC voltage supplied to the LED light source 30 can be stabilized.

  In addition, output terminals 91A and 91B are electrically connected to the input terminals 11A and 11B of the illumination light source device 100 according to the present embodiment, in front of the fuse 12. Therefore, a large number of illumination light source devices 100 can be easily connected by electrically connecting the input terminals 11A and 11B of another illumination light source device 100 to the output terminals 91A and 91B. As shown in FIG. 2, a large number of illumination light source devices 100 can be connected vertically and horizontally by electrically connecting the illumination light source devices 100 in series and in parallel. For example, even if a large number of illumination light source devices 100 are arranged in a plant growing or plant growing device, an external power supply device is not required because the power supply unit 10 is built in as a circuit of the circuit board 1.

  As described above, according to the illumination light source device 100 according to the present embodiment, since the power supply unit 10 is built in as a part of the circuit of the circuit board 1, no external power supply device is required. Therefore, it is freed from the troublesomeness of wiring, and the equipment cost can be reduced. Moreover, since the light source device 100 for illumination which concerns on this embodiment has the light control circuit part 60 as an optional component, it is equipped with the light control function of the said high power LED light source, providing a high-intensity high power LED light source. ing.

  The preferred embodiments of the present invention have been described above, but these are examples for explaining the present invention, and the scope of the present invention is not intended to be limited to these embodiments. The present invention can be implemented in various modes different from the above-described embodiments without departing from the gist thereof.

  The light source device for illumination according to the present invention is a light source device for cultivating fungal fruit bodies such as cocoons or fungal fruit body cultivation by appropriately setting the wavelength of the LED light source in addition to the light source device for plant cultivation or plant cultivation, The present invention can be widely applied as various light source devices such as insect light source devices or beast light source devices.

1 circuit board,
10 AC-DC rectifier,
20 power supply,
30 LED light source,
31, 32 LED,
40 voltage controller,
41 field effect element,
42 Voltage drop part,
50 Current adjuster,
60 light control circuit part,
91A, 91B Output terminal.

Claims (9)

At least in the conductive part of the circuit board,
An AC-DC rectifier for rectifying the input AC to DC;
A power supply unit that is electrically connected to the output unit of the AC-DC rectification unit and is built in as a part of the circuit of the circuit board;
An LED light source having a plurality of LEDs;
Interposed between the output unit of the power supply unit and the LED light source, and electrically connected to the voltage control unit for controlling the voltage supplied to the LED light source and the output unit of the AC-DC rectification unit; A current adjusting unit for adjusting a current value input to the LED light source;
An illumination light source device characterized by comprising:   The illumination light source device according to claim 1, wherein the power supply unit is a constant current power supply circuit or a constant voltage power supply circuit.   3. The illumination light source device according to claim 1, wherein the LED light source has LEDs of a plurality of colors having different wavelengths electrically connected in series and has an output of 1 W to 20 W / chip.   The said voltage control part has a field effect element for controlling an output current by variable voltage, and a voltage drop part for dropping the voltage of the said output current, The any one of Claim 1 to 3 characterized by the above-mentioned. The illumination light source device according to claim 1.   5. The illumination light source device according to claim 4, wherein the field effect element is formed of a MOSFET, an FET, or a CMOS, and the voltage drop unit is formed of a plurality of coils electrically connected in series. .   6. The lighting device according to claim 1, wherein a dimming circuit unit for adjusting a light amount of the LED light source is electrically connected to an output unit of the power supply unit. Light source device.   The light source device for illumination according to claim 6, wherein the dimming circuit unit is a variable resistor for variably operating a resistance value.   8. The illumination resistor according to claim 7, wherein the variable resistor includes a pulse width modulation circuit unit for transmitting a pulse width modulation signal and variably operating a resistance value of the variable resistor. Light source device.   9. The illumination light source device according to claim 1, wherein an output terminal is electrically connected to an input unit of the AC-DC rectification unit. 10.

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