WO2020122249A1 - Led light emission device - Google Patents

Led light emission device Download PDF

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Publication number
WO2020122249A1
WO2020122249A1 PCT/JP2019/049034 JP2019049034W WO2020122249A1 WO 2020122249 A1 WO2020122249 A1 WO 2020122249A1 JP 2019049034 W JP2019049034 W JP 2019049034W WO 2020122249 A1 WO2020122249 A1 WO 2020122249A1
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WIPO (PCT)
Prior art keywords
current
terminal
led
voltage
resistor
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Application number
PCT/JP2019/049034
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French (fr)
Japanese (ja)
Inventor
圭亮 堺
Original Assignee
シチズン電子株式会社
シチズン時計株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by シチズン電子株式会社, シチズン時計株式会社 filed Critical シチズン電子株式会社
Priority to CN201980081634.5A priority Critical patent/CN113170552B/en
Priority to JP2020559351A priority patent/JP6921340B2/en
Publication of WO2020122249A1 publication Critical patent/WO2020122249A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]

Definitions

  • the LED light-emitting device shown in FIG. 18 of Patent Document 1 uses an operational amplifier to adjust the upper limit current flowing in the LED according to the effective value. That is, an LED light emitting device using an operational amplifier is provided with a DC power supply circuit for driving the operational amplifier, a reference voltage source, and a mounting area and wiring for these, in addition to a power supply for supplying a current to the LED. There is a problem that the power supply circuit becomes complicated and becomes large in size.
  • the disclosed LED light-emitting device further includes a parallel capacitor connected in parallel to the LED string, and a backflow prevention diode arranged between the first stage anode and the parallel capacitor of the LED string and the rectifier circuit. ..
  • FIG. 3 is a waveform diagram in the circuit of the LED light emitting device shown in FIGS. 1 and 2.
  • It is a circuit diagram of an LED light emitting device shown as a second embodiment. It is a wave form diagram in the circuit of the LED light-emitting device shown in FIG. It is a circuit diagram of the LED light-emitting device shown as 3rd Embodiment. It is a wave form diagram in the circuit of the LED light-emitting device shown in FIG. It is a circuit diagram of the LED light-emitting device shown as 4th Embodiment.
  • FIG. 17A is a perspective view of the LED light emitting device shown in FIG. 17,
  • FIG. 17B is a plan view of the LED light emitting device shown in FIG. 17, and
  • FIG. 17C is a side view of the LED light emitting device shown in FIG. It is a figure.
  • the rectifier circuit 101 performs full-wave rectification on the AC voltage supplied from the commercial AC power supply 100 and outputs it to the load.
  • the load of the rectifier circuit 101 is a resistor, the voltage between the output terminals of the rectifier circuit 101 has a full-wave rectified waveform.
  • the smoothing circuit 12 has a first smoothing resistor 21, a second smoothing resistor 22, and a smoothing capacitor 23.
  • the left end of the first smoothing resistor 21 has a voltage input terminal, the right end has a first reference voltage output terminal, and a second reference voltage output terminal.
  • the lower ends of the smoothing resistor 22 and the smoothing capacitor 23 become the ground terminals of the smoothing circuit 12 (see FIGS. 1 and 2).
  • the smoothing circuit 12 generates a first reference voltage obtained by smoothing a voltage (voltage that changes in synchronization with the full-wave rectified waveform) input via the first smoothing resistor 21, and generates the first reference voltage as a first reference voltage. Output from the reference voltage output terminal.
  • One end (voltage input terminal) of the first smoothing resistor 21 is connected to the second terminal that is the cathode of the LED 110 at the final stage of the LED string 11, and the other end (first reference voltage output terminal) of the first smoothing resistor 21 is connected.
  • the second smoothing resistor 22 and the smoothing capacitor 23 are connected to one end thereof.
  • the second smoothing resistor 22 is connected in series with the first smoothing resistor 21, and the smoothing capacitor 23 is connected in parallel with the second smoothing resistor 22.
  • the voltage of the first reference voltage output terminal which is the other end of the first smoothing resistor 21, the one ends of the second smoothing resistor 22 and the smoothing capacitor 23, becomes the first reference voltage.
  • the smoothing circuit 12 charges the smoothing capacitor 23 via the first smoothing resistor 21 and discharges the charge charged on the smoothing capacitor 23 via the second smoothing resistor 22.
  • the first reference voltage output from the first reference voltage output terminal of the smoothing circuit 12 divides the voltage output from the first output terminal of the LED string 11 by the first smoothing resistor 21 and the second smoothing resistor 22, It can be said that the averaged voltage. That is, the first reference voltage changes according to the change in the effective value of the commercial AC power supply 100. When the effective value of the commercial AC power supply 100 is high, the first reference voltage is high, and when the effective value of the commercial AC power supply 100 is low, the first reference voltage is low.
  • the first current limiting circuit 13 includes a first FET 30 (first current limiting element), a first pull-up resistor 31, a first input resistor 32, a first output resistor 33, a first detecting resistor 34, and a first detecting resistor 34. It has a transistor 35 (first control element) and a first chattering prevention capacitor 36.
  • the first current input terminal is connected to the second terminal of the LED array 11, and the first current output terminal is connected to the terminal to which the current of the rectifier circuit returns, and the preset upper limit current (first reference value)
  • the upper limit current set when the voltage input terminal is opened) is adjusted by the first reference voltage that changes according to the full-wave rectified voltage (or the effective value of the commercial power supply). At this time, the first current having a rectangular pulse waveform flows through each of the plurality of LEDs 110.
  • FIGS. 3A and 3B are explanatory diagrams of a current flowing through the LED light emitting device 1.
  • FIG. 3A shows a full-wave rectified waveform for one cycle
  • FIG. 3B shows a current flowing through the LED string 11.
  • the vertical axis V is voltage and the horizontal axis t is time.
  • the vertical axis I is the current and the horizontal axis t is the time.
  • the horizontal axes t in FIGS. 3A and 3B correspond to each other. Further, in describing FIG. 3, reference is made to FIGS. 1 and 2 without giving special instructions.
  • the current flowing through the first smoothing resistor 21, the second smoothing resistor 22, the first pull-up resistor 31, the first input resistor 32, and the first output resistor 33 flows through the drain current of the first FET 30 and the first detection resistor 34. Remarkably smaller than the current. Therefore, the current flowing through the smoothing circuit 12 and the first current limiting circuit 13 will be described in the case where it is specified explicitly, and the operation of the LED light emitting device 1 will be described with reference to the voltages of the smoothing circuit 12 and the first current limiting circuit 13. To be done.
  • the full-wave rectified waveform 201 shows a state where the effective value is 100V (normal state)
  • the full-wave rectified waveform 202 shows a state where the effective value is 120V
  • the full-wave rectified waveform 203 shows The effective value is 80V.
  • the full-wave rectified waveform 201 having an effective value of 100 V is in a standard state, and the full-wave rectified waveforms 202 and 203 are in a state in which the voltage of the commercial AC power supply 100 fluctuates for some reason.
  • the current waveform 204 shows the current flowing through the LED light emitting device 1 according to the full-wave rectified waveform 201 shown in FIG.
  • Current waveforms 205 and 206 indicate currents flowing through the LED light emitting device 1 corresponding to the full-wave rectified waveforms 202 and 203, respectively.
  • the current waveform 205 has a larger duty than the current waveform 204, while the peak value is the current waveform. It is lower than 204. That is, when the full-wave rectified waveform 202 is applied to the LED string 11, the LED light-emitting device 1 has a longer lighting period for the plurality of LEDs 110 included in the LED string 11 as compared to the normal state, while The brightness when the plurality of included LEDs 110 are turned on is reduced. As a result, the LED light emitting device 1 makes the brightness substantially the same when the voltage waveform applied to the LED array 11 is the full-wave rectified waveform 201 and the full-wave rectified waveform 202.
  • the first reference voltage which is the voltage at the first reference voltage output terminal of the smoothing circuit 12 becomes the full-wave rectified waveform 201. Is higher than when it is applied to the LED string 11.
  • the potential difference from the second reference voltage which is the base voltage of the first transistor 35 maintained at 0.6V, increases, and the current flowing through the first input resistor 32 increases. Since the current flowing through the first output resistor 33 increases as the current flowing through the first input resistor 32 increases, the voltage drop ⁇ in the first output resistor 33 is caused by the full-wave rectified waveform 201 in the LED string 11. Greater than when applied.
  • the first current I lim flowing through the first detection resistor 34 is calculated from the second reference voltage V be , which is 0.6 V, and the resistance value R sen of the first detection resistor 34.
  • the first current I lim decreases as the voltage drop ⁇ in the first output resistor 33 increases.
  • the first FET 30, the first pull-up resistor 31, and the first detection resistor 34 which directly connect one end of the first detection resistor 34 to the base of the first transistor 35, not via the first input resistor 32 and the first output resistor 33.
  • the circuit including the first transistor 35 and the first transistor 35 is a well-known current limiting circuit.
  • the commercial AC Information about the effective value of the power supply 100 is fed back. That is, the first current limiting circuit 13 becomes a current limiting circuit of the LED array 11 in which the effective value of the commercial AC power supply 100 is reflected.
  • the first input resistor 32 and the first output resistor 33 form a so-called voltage adding circuit.
  • the LED light emitting device 1 has the passive components such as the first smoothing resistor 21, the second smoothing resistor 22, the smoothing capacitor 23, the first input resistor 32, and the first output resistor 33, which have been known so far.
  • the current limiting circuit has a function of canceling a change in the effective value of the commercial AC power supply 100.
  • the LED current can be adjusted in the opposite direction to the change in the effective value without preparing a new DC power source, and fluctuations in brightness linked to the effective value can be prevented. I can now suppress it.
  • FIG. 4 is a circuit diagram of the LED light emitting device 2.
  • the same members as those of the LED light emitting device 1 of FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.
  • 5A and 5B are explanatory diagrams of a current flowing through the LED light emitting device 2, where FIG. 5A shows a full-wave rectified waveform for one cycle, and FIG.
  • FIG. 5B shows a current flowing through the LED string 11.
  • the vertical axis V is voltage and the horizontal axis t is time.
  • the vertical axis I is the current and the horizontal axis t is the time.
  • the horizontal axes t in FIGS. 5A and 5B are in agreement. Further, when explaining the operation of the LED light emitting device 2 with reference to FIG. 5, FIG. 4 will be referred to without giving a special instruction.
  • the number of LEDs 110 included in the first LED row 11a and the second LED row 11b may be the same or different.
  • the final-stage LED 110 of the first LED row 11a is an LED other than the final-stage LED of the plurality of LEDs included in the LED row 11, and is also referred to as a second connection LED.
  • the cathode of the second connection LED and the anode of the first-stage LED of the second LED array 11b form a third terminal and are connected to the second current input terminal of the second current limiting circuit 14.
  • the components (second FET 40, second chattering prevention capacitor 46, etc.) denoted by reference numerals 40 to 46 are respectively the components (first FET 30, first pull-up resistor 31, first chattering prevention capacitor 36, etc.) denoted by reference numerals 30 to 36. ) And the correspondence.
  • the second FET 40 limits the upper limit value of the current value flowing through the first LED string 11a by canceling the variation in the effective value of the commercial AC power supply 100, similarly to the first FET 30.
  • the second current limiting circuit 14 when a current starts flowing through the second LED string 11b, the voltage at one end (first current input terminal) of the second detection resistor 44 rises and the second FET 40 is cut off.
  • FIG. 5A is different from FIG. 3A in that the threshold value Vt1 of the first LED row 11a is shown.
  • the full-wave rectified waveforms 201, 202, and 203 in FIG. 5A are the same as the full-wave rectified waveforms 201, 202, and 203 in FIG.
  • current waveforms 214, 215, and 216 show currents flowing through the LED light emitting device 2 corresponding to the full-wave rectified waveforms 201, 202, and 203 shown in FIG. 5A, respectively.
  • the current waveform 214 in the normal state is 0 (A) during the period when the voltage of the full-wave rectified waveform 201 is lower than the threshold value Vt1.
  • the second current starts flowing through the first LED string 11a, and the current waveform 214 rises sharply.
  • the second current limiting circuit 14 functions as a current limiting circuit and the current waveform 214 becomes flat.
  • the current waveform 214 suddenly rises.
  • the first current flows through the first LED row 11a and the second LED row 11b, the second FET 40 of the second current limiting circuit 14 is cut off, and the second FET 40 is turned off. The current path through it is cut off.
  • the current waveform 214 becomes flat at a higher value due to the current limitation of the second FET 40. In the phase where the voltage of the full-wave rectified waveform 201 drops, the reverse process is followed.
  • the current waveforms 215 and 216 of the LED array 11 are stepwise rectangular waves even for the full-wave rectified waveforms 202 and 203 having different effective values.
  • the current waveform 215 has a longer peak period during which the LED 110 is lit while the current waveform 215 has a lower peak value.
  • the LED light-emitting device 2 has a longer lighting period of the LED string 11 than in the normal state, but at the time of lighting the LED string 11. The brightness is reduced.
  • the LED light emitting device 2 makes the brightness of the LED light emitting device 2 substantially the same when the voltage waveform applied to the LED string 11 is the full-wave rectified waveform 201 and the case where the voltage waveform is the full-wave rectified waveform 202.
  • the LED light-emitting device 2 When the full-wave rectified waveform 203 having an effective value smaller than that of the full-wave rectified waveform 201 is applied to the LED row 11, the LED light-emitting device 2 has a shorter lighting period of the LED row 11 than the normal state, while the LED row 11 has a shorter lighting period. The brightness at the time of lighting increases.
  • the LED light emitting device 2 makes the brightness substantially the same when the voltage waveform applied to the LED array 11 is the full-wave rectified waveform 201 and the full-wave rectified waveform 203.
  • the first reference voltage terminal that outputs the first reference voltage is directly connected to each of the first input resistor 32 and the second input resistor 42. Further, in the LED light emitting device 2, the first detection resistor 34 and the second detection resistor 44 are connected in series.
  • both the smoothing circuit 12 and the first current limiting circuit 13 are offset by the voltage at one end of the second detection resistor 44. Since the smoothing circuit 12 and the first current limiting circuit 13 are offset by the same voltage, the first current I lim flowing through the first detection resistor 34 is equal to the second reference voltage V be , the voltage drop ⁇ at the first output resistor 33, and The relationship of Expression (1) is satisfied with the resistance value R sen of the first detection resistor 34.
  • the first reference voltage terminal is directly connected to the first input resistor 32 and the second input resistor 42, and the first detection resistor 34 and the second detection resistor 44 are connected in series,
  • the first current and the second current can be defined by the equation (1).
  • the first output resistance 33, the first detection resistance 34, the second output resistance 43, and the second detection resistance 44 are The first current and the second current can be easily defined by setting the resistance value to a desired value.
  • FIG. 6 is a circuit diagram of the LED light emitting device 3.
  • the same members as those of the LED light emitting devices 1 and 2 described with reference to FIGS. 1, 2, and 4 are denoted by the same reference numerals, and the description thereof will be omitted.
  • FIG. 7 is an explanatory diagram of a current flowing through the LED light emitting device 3, where (a) shows a full-wave rectified waveform for one cycle, and (b) shows a current output by the rectifier circuit 101.
  • FIG. 7A is the same as FIG. 5A, in which the vertical axis V is voltage and the horizontal axis t is time.
  • FIG. 7B the vertical axis I is the current and the horizontal axis t is the time.
  • the horizontal axes t in FIGS. 7A and 7B coincide with each other. Further, when explaining the operation of the LED light emitting device 3 with reference to FIG. 7, reference is made to FIG. 6 without giving a special instruction.
  • the difference between the LED light emitting device 3 shown in FIG. 6 and the LED light emitting device 2 shown in FIG. 4 is that in the LED light emitting device 2, a first parallel capacitor 47 connected in parallel to the first LED row 11a and the second LED row 11b, Having the second parallel capacitor 37 may be mentioned. Further, the difference between the LED light emitting device 3 and the LED light emitting device 2 is that the first backflow prevention diode 38 and the second backflow prevention diode 48 are provided at the anodes of the LEDs 110 in the first stage of the first LED row 11a and the second LED row 11b. Be done.
  • the current waveforms 224, 225, and 226 shown in FIG. 7B are currents output by the rectifier circuit 101 corresponding to the full-wave rectified waveforms 201, 202, and 203 shown in FIG. 7A.
  • the first backflow prevention diode 48 prevents the electric charge received by the first parallel capacitor 47 from flowing back to the rectifier circuit 101, and the second backflow prevention diode 38 detects the electric charge received by the second parallel capacitor 37 by the first charge. The backflow to the two-current limiting circuit 14 is prevented.
  • FIG. 8 is a circuit diagram of the LED light emitting device 4.
  • the same members as those of the LED light emitting devices 1 to 3 described with reference to FIGS. 1, 2, 4, and 6 are designated by the same reference numerals, and the description thereof will be omitted.
  • 9A and 9B are explanatory diagrams of a current flowing through the LED light emitting device 4, where FIG. 9A illustrates a full-wave rectified waveform for one cycle, and FIG. 9B illustrates a current output by the rectifier circuit 101.
  • 9A is the same as FIG. 5A and FIG.
  • the vertical axis V is voltage
  • the horizontal axis t is time
  • the vertical axis I is the current
  • the horizontal axis t is the time.
  • the horizontal axes t in FIGS. 9A and 9B match each other. Further, when explaining the operation of the LED light emitting device 4 with reference to FIG. 9, FIG. 8 will be referred to without giving a special instruction.
  • the difference between the LED light emitting device 4 shown in FIG. 8 and the LED light emitting device 3 shown in FIG. 6 is that in the LED light emitting device 3, a first transistor 35 and a second transistor 45, which are connected in parallel between the collector and the emitter, respectively. It can be mentioned that the first parallel resistance 39 and the second parallel resistance 49 are included.
  • Current waveforms 221, 222, 223 shown in FIG. 9B are currents output by the rectifier circuit 101 corresponding to the full-wave rectified waveforms 201, 202, 203 shown in FIG. 9A.
  • the number of LEDs 110 included in the first LED row 11a, the second LED row 11b, and the third LED row 11c may be the same or different.
  • the final-stage LED 110 of the first LED row 11a is an LED other than the final-stage LED of the plurality of LEDs included in the LED row 11, and is also referred to as a third connection LED.
  • the cathode of the third connection LED is the fourth terminal connected to the anode of the LED in the first stage of the second LED string 11b and the third current limiting circuit 15.
  • the LED 110 at the final stage of the second LED row 11b is also referred to as a second connection LED.
  • the cathode of the second connection LED is the third terminal connected to the anode of the first-stage LED of the third LED string 11c and the second current limiting circuit 14.
  • the third current limiting circuit 15 includes a third FET 50, a third pull-up resistor 51, a third input resistor 52, a third output resistor 53, a third detection resistor 54, a third transistor 55, and a third chattering. And a prevention capacitor 56.
  • the third current limiting circuit 15 is connected to the fourth terminal and the first reference voltage output terminal, and the third current smoothed according to the first reference voltage is the first-stage LED of the plurality of LEDs 110 included in the LED string 11. And limiting the third current to flow through each of the LEDs between and the third connected LED.
  • Each of the third FET 50 to the third chattering prevention capacitor 56 has a correspondence relationship with the first FET 30 to the first chattering prevention capacitor 36.
  • the third FET 50 limits the upper limit value of the current value flowing through the first LED array 11a by canceling the effective value fluctuation of the commercial AC power supply 100, similarly to the first FET 30.
  • the third current limiting circuit 15 when a current starts to flow in the second LED string 11b, the voltage at one end of the third detection resistor 54 rises and the third FET 50 is cut off.
  • FIG. 11 is a circuit diagram of the LED light emitting device 6 according to the sixth embodiment.
  • the LED light emitting device 6 according to the sixth embodiment is different from the LED light emitting device 1 in that the LED light emitting device 6 includes a first current limiting circuit 13a instead of the first current limiting circuit 13.
  • the components and functions of the LED light-emitting device 6 other than the first current limiting circuit 13a are the same as the components and functions of the LED light-emitting device 1 denoted by the same reference numerals, and thus detailed description thereof will be omitted here. ..
  • the first current limiting circuit 13 a differs from the first current limiting circuit 13 in that the first detection resistor 34 and the smoothing circuit 12 are not connected and the first chattering prevention capacitor 36 is not provided.
  • one end of the first detection resistor 34 is connected to the source of the first FET 30 and the other end of the first output resistor 33, and the other end of the first detection resistor 34 is the ground terminal of the smoothing circuit 12. And the terminal of the rectifier circuit 101 to which the current returns.
  • the smoothing circuit 12 is connected to the second terminal of the LED array 11, but if the first reference voltage output by the smoothing circuit 12 changes in conjunction with the effective value of the commercial AC power supply 100. Since it is good, the smoothing circuit 12 may be connected to a terminal other than the second terminal of the LED array 11. For example, the smoothing circuit 12 may be connected to the first terminal of the LED array 11 or may be connected to the third terminal which is the connection point of the first LED array 11a and the second LED array 11b. The other ends of the second smoothing resistor 22 and the smoothing capacitor 23 included in the smoothing circuit 12 may be connected to the ground.
  • FIG. 12 is a circuit diagram of the LED light emitting device 7 according to the seventh embodiment.
  • the LED light emitting device 7 according to the seventh embodiment is different from the LED light emitting device 1 in the connection relationship between the rectifying circuit 101 and the LED array 11 and the smoothing circuit 12.
  • the configurations and functions of the components of the LED light-emitting device 7 other than the connection relationship between the rectifying circuit 101 and the LED array 11 and the smoothing circuit 12 are the same as those of the components of the LED light-emitting device 1 denoted by the same reference numerals. Since they are the same, detailed description is omitted here.
  • the smoothing circuit 12 is connected not to the second terminal of the LED string 11 but to the terminal that outputs the current of the rectifying circuit 101 and the first terminal of the LED string 11.
  • the first reference voltage is supplied without being affected by the voltage drop in the LED string 11. Since it can be generated, the first reference voltage can be made higher than that of the LED light emitting device 1.
  • FIG. 13 is a circuit diagram of the LED light emitting device 8 according to the eighth embodiment.
  • the LED light emitting device 8 according to the eighth embodiment is different from the LED light emitting device 1 in that it has a smoothing circuit 12a instead of the smoothing circuit 12.
  • the configurations and functions of the components of the LED light emitting device 8 other than the smoothing circuit 12a are the same as the configurations and functions of the components of the LED light emitting device 1 designated by the same reference numerals, and thus detailed description thereof is omitted here.
  • the smoothing circuit 12 a includes a first switching diode 24, a third smoothing resistor 25, a fourth smoothing resistor 26, a second smoothing capacitor 27, a second diode 28, a first smoothing resistor 21, a second smoothing resistor 22 and a smoothing capacitor 23. In addition to that, the smoothing circuit 12 is different.
  • FIG. 14( a) is a diagram showing the change over time in the voltage of the first terminal of the LED string 11 per cycle
  • FIG. 14( b) is a diagram showing the change in the voltage of the second terminal of the LED string 11 per cycle. It is a figure which shows a time-dependent change.
  • the horizontal axis represents time
  • the horizontal axes in FIGS. 14A and 14B correspond to each other.
  • the vertical axis in FIGS. 14A and 14B represents voltage.
  • each of waveforms 901 to 905 shows the voltage rectified by the rectifier circuit 101 when the AC voltage input to the rectifier circuit 101 changes.
  • a waveform 901 shows a state where the effective value of the AC voltage is the lowest, and a waveform 905 shows a state where the effective value of the AC voltage is the highest.
  • each of the waveforms 911 to 915 indicates the voltage of the second terminal of the LED string 11 corresponding to each of the waveforms 901 to 905.
  • Each of the waveforms 911 to 915 is 0V until the voltage indicated by the waveforms 901 to 905 exceeds the threshold voltage at which the LEDs 110 included in the LED string 11 start emitting light.
  • Each of the waveforms 911-915 rises when the threshold voltage is exceeded by the voltage represented by the waveforms 901-905.
  • the peak value of the waveform 911 corresponding to the waveform 901 is the lowest, and the peak value of the waveform 915 corresponding to the waveform 905 is the highest.
  • FIG. 15 is a diagram showing the relationship between the effective value of the AC voltage input to the LED light emitting device 8 and the voltage smoothed by the smoothing circuit 12a.
  • the horizontal axis represents the effective value of the AC voltage input to the LED light emitting device 8
  • the vertical axis represents the voltage smoothed by the smoothing circuit 12a.
  • the first reference voltage 930 is the voltage at one end of the first input resistor 32, which is indicated by Vfb in FIG.
  • the first smoothed voltage 931 is the voltage at one end of the smoothing capacitor 23 indicated by Vk1 in FIG. 13, and the second smoothed voltage 932 is the voltage at the one end of the second smoothing capacitor 27 indicated by Vin1 in FIG.
  • the first smoothed voltage 931 becomes 0 V when the effective value of the AC voltage matches the threshold voltage at which the LEDs 110 included in the LED string 11 start emitting light.
  • the second smoothed voltage 932 becomes 0V when the effective value of the AC voltage becomes 0V.
  • the first reference voltage 930 is a voltage dropped from the first smoothed voltage 931 by the forward voltage of the first switching diode 24.
  • the first reference voltage 930 is a voltage dropped from the second smoothed voltage 932 by the forward voltage of the second switching diode 28.
  • FIG. 16 is a circuit diagram of the LED light emitting device 9 according to the ninth embodiment.
  • the LED light emitting device 9 according to the ninth embodiment is different from the LED light emitting device 1 in that the smoothing circuit 12b is provided instead of the smoothing circuit 12.
  • the configurations and functions of the components of the LED light emitting device 9 other than the smoothing circuit 12b are the same as the configurations and functions of the components of the LED light emitting device 1 denoted by the same reference numerals, and thus detailed description thereof will be omitted here.
  • the smoothing circuit 12b differs from the smoothing circuit 12 in that it has an arithmetic circuit 29.
  • the configurations and functions of the components of the smoothing circuit 12b other than the arithmetic circuit 29 are the same as the configurations and functions of the components of the smoothing circuit 12 designated by the same reference numerals, and thus detailed description thereof is omitted here.
  • the arithmetic circuit 29 is, for example, an MPU (microprocessor unit), corrects the voltage of the second terminal of the LED string 11 based on various data, and calculates the first reference voltage supplied to the first current limiting circuit 13. ..
  • the arithmetic circuit 29 includes a voltage that is full-wave rectified by the rectifying circuit 101, a voltage of a terminal other than the second terminal of the LED array 11, an output voltage of an illuminance sensor that indicates the light intensity of light outside the LED light-emitting device 9, and a temperature.
  • the first reference voltage is calculated based on the output voltage of the thermistor and the like.
  • FIG. 17 is a circuit diagram of the LED light emitting device 10 according to the tenth embodiment.
  • the LED light emitting device 10 according to the tenth embodiment includes a rectifying circuit 101, an LED array 11, a smoothing circuit 12, a first current limiting circuit 13b, a second current limiting circuit 14, and a third current limiting circuit 15. , A fourth current limiting circuit 16, a fifth current limiting circuit 17, and a sixth current limiting circuit 18.
  • the LED light emitting device 10 further includes an overcurrent prevention circuit 19. Since the configuration and function of the rectifier circuit 101 have been described with reference to FIG. 1 and the like, detailed description thereof will be omitted here.
  • the LED row 11 includes a first LED row 11d, a second LED row 11e, a third LED row 11f, a fourth LED row 11g, a fifth LED row 11h, and a sixth LED row 11i.
  • the first LED group 11d includes a first LED group 111, a second LED group 112, a parallel switching element 113, a first series switching element 114, a second series switching element 115, a first parallel capacitor 116, and a first parallel capacitor 116. It has one backflow prevention diode 117 and a first parallel resistor 118.
  • Each of the first LED group 111 and the second LED group 112 has a plurality of LEDs 110 connected in series.
  • the parallel switching element 113, the first series switching element 114, and the second series switching element 115 are disconnectable wiring elements also called jumpers.
  • the parallel switching element 113 is arranged between the final stage cathode of the first LED group 111 and the initial stage anode of the second LED group 112.
  • the first series switching element 114 has a first stage anode of the second LED group 112, and a first branch point at which wirings connected to the first stage anode of the first LED group 111 and the first stage anode of the second LED group 112 branch. Is placed between.
  • the second series switching element 115 has a second cathode in which the wiring connected to each of the cathode in the final stage of the first LED group 111, the cathode in the final stage of the first LED group 111, and the cathode in the final stage of the second LED group 112 is branched. It is placed between the junction and the branch point.
  • the LED light emitting device 10 has a configuration in which the first LED group 11d is arranged such that the first LED group 111 and the second LED can be switched in series and parallel so that the input AC voltage is compatible with both 100V and 200V. be able to.
  • the configurations and functions of the first parallel capacitor 116 and the first backflow prevention diode 117 are similar to the configurations and functions of the first parallel capacitor 37 and the first backflow prevention diode 38 described with reference to FIG. Detailed description is omitted.
  • the first parallel resistor 118 is connected in parallel with the first LED group 111 and the second LED group 112 together with the first parallel capacitor 116.
  • each of the second LED row 11e to the sixth LED row 11i has the same configuration and function as the first LED row 11d, detailed description thereof will be omitted here. Since the smoothing circuit 12 has been described with reference to FIG. 1 and the like, detailed description thereof will be omitted here.
  • the first current limiting circuit 13b In the first current limiting circuit 13b, four circuits having the same configuration as the first current limiting circuit 13 described with reference to FIG. 1 and the like are connected in parallel.
  • the first current limiting circuit 13b is configured such that four circuits having the same configuration as the first current limiting circuit 13 are connected in parallel to reduce the current flowing through each of the FETs and the LED light emitting device 10 emits light. The increase in the temperature of the FET is reduced.
  • each of the second current limiting circuit 14 to the sixth current limiting circuit 18 has the same configuration and function as the first current limiting circuit 13 described with reference to FIG. 1 and the like, detailed description thereof is omitted here. To do.
  • the overcurrent prevention circuit 19 has a current limiting resistor 91, a Zener diode 92, and a current limiting FET 93.
  • the current limiting resistor 91 has one end connected between the terminal for outputting the current of the rectifying circuit 101 and the anode of the first-stage LED of the plurality of LEDs included in the LED array 11.
  • the cathode is connected to the other end of the current limiting resistor 91, and the anode is connected to the terminal to which the current of the rectifier circuit 101 returns.
  • the gate of the current limiting FET 93 is connected to the other end of the current limiting resistor 91, the drain is connected to the first current limiting circuit 13d through the second current limiting circuit 14 to the sixth current limiting circuit 18, and the current limiting FET 93 of the rectifying circuit 101 is connected.
  • the source is connected to the terminal where the current returns.
  • the voltage for full-wave rectification by the rectifier circuit becomes higher than the Zener voltage of the Zener diode 92, which is 12 V in one example, and when the Zener current flows through the Zener diode 92, the current limiting FET 93 turns on. While the Zener current flows through the Zener diode 92, the current limiting FET 93 functions as a current limiting element that limits the current so that a current equal to or larger than the drain current when the gate voltage matches the Zener voltage of the Zener diode 92 does not flow.
  • the LED light-emitting device 10 has the overcurrent prevention circuit 19 having the current limiting FET 93 that functions as a current limiting element, so that even when an overvoltage is applied to the input of the rectifier circuit 101, the LED light emitting device 10 is provided with a plurality of LEDs 110 included in the LED string 11.
  • the flowing current can be limited.
  • the withstand voltage of the FET is twice as large as the breakdown voltage of the FET and is included in the LED string. Is a voltage obtained by adding the voltage drop due to the LED 110.
  • FIG. 18A is a perspective view of the LED light emitting device 9
  • FIG. 18B is a plan view of the LED light emitting device 9
  • FIG. 18C is a side view of the LED light emitting device 10. ..
  • the LED light emitting device 10 has a circuit board 90 on which various components, which are discrete products forming the LED light emitting device 9 such as an LED, an electrolytic capacitor, a resistor, and a FET, are mounted.
  • the LED 110, the FET 30, the first parallel capacitor 116, which is an electrolytic capacitor, and the like are mounted on the circuit board 90.
  • the LED 110 is arranged outside the circuit board 90, the FET 30 and the resistor are arranged inside the LED 110, and the first parallel capacitor 116 is arranged inside the FET 30 and the resistor.
  • a heat sink 95 is arranged on the back surface of the area of the circuit board 90 where the LED 110, the FET 30, the resistor and the like are arranged.
  • the LED 110 is arranged on the outer periphery of the circuit board 90, and the first parallel capacitor 116 having a high height is arranged at the center of the circuit board 90, so that the light emitted by the LED 110 is generated by the first parallel capacitor. There is a low risk that the light-emission efficiency will be reduced by blocking 116. Further, in the LED light emitting device 10, by arranging the same elements collectively in a predetermined area, efficient wiring can be performed.
  • the LED light emitting device 10 arranges the heat generating components such as the LED and the FET 30 on the heat sink 95 while ensuring the wiring route at the center of the circuit board 90, thereby ensuring the heat radiation property and maintaining the LED light emitting device 10. It is possible to minimize the size of the light emitting device installed.
  • FIG. 19 is a circuit diagram 10 ′ of an LED light emitting device according to a modification of the LED light emitting device 10 according to the tenth embodiment.
  • An LED light emitting device 10 ′ according to a modified example of the LED light emitting device 10 differs from the LED light emitting device 10 in that it has a first current limiting circuit 13 c instead of the first current limiting circuit 13 b.
  • the configurations and functions of the components of the LED light emitting device 10' other than the first current limiting circuit 13c are the same as the configurations and functions of the components of the LED light emitting device 10 denoted by the same reference numerals, and thus detailed description thereof is omitted here. To do.
  • the first current limiting circuit 13c is different from the first current limiting circuit 13 in that it has four first FETs 30 connected in parallel instead of the single first FET 30.
  • the first current limiting circuit 13c has the four first FETs 30 connected in parallel, so that the current flowing through each of the first FETs 30 is reduced, and the temperature rise of the FETs while the LED light emitting device 10' emits light is reduced. To do.
  • the first current limiting element included in the first current limiting circuit is the FET, but the LED light emitting device according to the embodiment has the transistor as the first current limiting element instead of the FET. Good.
  • the transistor is used as the F first current limiting element, the first current input terminal connected to the second terminal is the collector and the second terminal through which the first current flows is the emitter. .. Further, the first control terminal that controls the first current according to the applied voltage is the base.
  • the first control element included in the first current limiting circuit is a transistor, but the LED light emitting device according to the embodiment has a configuration corresponding to the variable resistance portion and the second reference voltage terminal.
  • the element to be included may be included as the first control element instead of the transistor.
  • the LED light emitting device according to the embodiment may include a shunt regulator as the first control element.
  • the LED light emitting device may have the following modes.
  • Rectifier circuit for full-wave rectification of commercial AC power supply An LED string that is connected to a rectifier circuit and has a plurality of LEDs connected in series, A current limiting element connected to the LED string, A current detection resistor connected to the current limiting element, An integrating circuit including a capacitor and two resistors, which is connected to the LED string, An adder unit that includes two resistors and adds the output voltage of the integrating circuit and the voltage at one end of the current detection resistor;
  • An LED light-emitting device comprising: a transistor and a resistor, the base of the transistor being connected to the adder, and the collector of the transistor being connected to the resistor and the control terminal of the current limiting element.
  • the LED row includes a first partial LED row and a second partial LED row, The first partial LED row and the second partial LED row are serially connected in order from the rectifier circuit side, Another current limiting element connected to a connection point between the first partial LED string and the second partial LED string, Another current detection resistor connected to another current limiting element, Another adder including two resistors and adding the output voltage of the integrating circuit and the voltage at one end of the other current detection resistor, Another inverting amplifier including a transistor and a resistor, the base of the transistor connected to the other adder, and the collector of the transistor connected to the resistor and the control terminal of the other current limiting element.
  • the LED light emitting device (1), wherein the current flowing through the second partial LED string flows into another current detection circuit.

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Abstract

An LED light emission device comprises: a rectifying circuit having a terminal which outputs current and a terminal to which current returns; an LED array having a first terminal and a second terminal; a smoothing circuit having a voltage input terminal and a first reference voltage output terminal; and a first current limitation circuit having a first current input terminal, a first current output terminal, and a first reference voltage input terminal. The terminal which outputs current is connected to the first terminal. The second terminal is connected to the first current input terminal. The voltage input terminal is connected to a current path from the terminal which outputs current to the second terminal. The first reference voltage output terminal is connected to the first reference voltage input terminal. The first current output terminal is connected to the terminal to which current returns. The rectifying circuit performs full-wave rectification of AC voltage. The smoothing circuit smoothes voltage at the voltage input terminal, and outputs the smoothed voltage from the first reference voltage output terminal. The first current limiting circuit adjusts the current flowing through the first current input terminal by the voltage at the first reference voltage input terminal when an LED included in the LED array emits light.

Description

ＬＥＤ発光装置LED light emitting device
　本発明は、ＬＥＤ発光装置に関する。 The present invention relates to an LED light emitting device.
　商用交流電源が供給する電圧の実効値は、様々な原因で変動することがある。しかしながら、商用交流電源の実効値変動にかかわらず、ＬＥＤ発光装置の明るさは一定であることが望まれる。 The effective value of the voltage supplied by the commercial AC power supply may fluctuate due to various reasons. However, it is desired that the brightness of the LED light emitting device be constant regardless of the fluctuation of the effective value of the commercial AC power supply.
　ＬＥＤ発光装置は、ＡＣ駆動型とＤＣ駆動型に分類されることがある。これまで、ＡＣ駆動型のＬＥＤ発光装置は、ＬＥＤが直列接続したＬＥＤ列に交流電圧（又は全波整流波形）を印加し、ＬＥＤ列に流れる電流が周期的に変化するものとしてきた。同様に、ＤＣ駆動型のＬＥＤ発光装置は、ＬＥＤ列に整流・平滑した電圧を印加し、ＬＥＤ列に流れる電流が一定になるものとしてきた。 LED light emitting devices may be classified into AC drive type and DC drive type. Heretofore, AC-driven LED light-emitting devices have been configured such that an AC voltage (or a full-wave rectified waveform) is applied to an LED string in which LEDs are connected in series, and a current flowing through the LED string changes periodically. Similarly, the DC drive type LED light emitting device has applied a rectified and smoothed voltage to the LED array so that the current flowing through the LED array becomes constant.
　しかしながら、最近では、主にフリッカ対策として、ＡＣ駆動型のＬＥＤ発光装置でもＬＥＤ列に安定した電流を流すようになり、前述の分類基準が相応しくなくなってきている。そこで、本明細書では、これまでの技術的発展を鑑みて、ＤＣ－ＤＣコンバータを備えていないＬＥＤ発光装置をＡＣ駆動型のＬＥＤ発光装置と呼び、ＤＣ－ＤＣコンバータを備えているＬＥＤ発光装置をＤＣ駆動型のＬＥＤ発光装置と呼ぶ。 However, recently, mainly as a countermeasure against flicker, even in AC-driven LED light-emitting devices, a stable current flows through the LED array, and the above-mentioned classification criteria are no longer suitable. Therefore, in the present specification, in view of the technical development so far, an LED light emitting device which does not include a DC-DC converter is referred to as an AC drive type LED light emitting device, and an LED light emitting device including a DC-DC converter is referred to. Is called a DC drive type LED light emitting device.
　ＤＣ駆動型のＬＥＤ発光装置に内蔵されたＤＣ－ＤＣコンバータは、整流回路及び平滑用コンデンサによって商用交流電源から生成される比較的リップルの多い直流電圧を、基準電圧源の電圧を参照しながら昇圧又は降圧によって安定化し、この安定した直流電圧によりＬＥＤを駆動する。すなわち、ＤＣ駆動型のＬＥＤ発光装置は、ＤＣ－ＤＣコンバータが正常に動作するとき、商用交流電源の実効値が変動するか否かにかかわらず、明るさが変化しない。しかしながら、ＤＣ駆動型のＬＥＤ発光装置は、ＤＣ－ＤＣコンバータを有するため、電源回路が複雑化すると共に大型化・重量化するという課題がある。 A DC-DC converter built in a DC drive type LED light emitting device boosts a DC voltage having a relatively large ripple generated from a commercial AC power supply by a rectifying circuit and a smoothing capacitor while referring to a voltage of a reference voltage source. Alternatively, the voltage is stabilized by step-down, and the LED is driven by this stable DC voltage. That is, in the DC drive type LED light emitting device, when the DC-DC converter operates normally, the brightness does not change regardless of whether the effective value of the commercial AC power supply changes. However, since the DC drive type LED light emitting device has the DC-DC converter, there is a problem that the power supply circuit becomes complicated and becomes large and heavy.
　一方、多くのＡＣ駆動型のＬＥＤ発光装置は、商用交流電源を全波整流し、全波整流した電圧（全波整流波形）を直接的にＬＥＤ列に印加するので、電源回路が簡単であるという有利な特徴を備えている。しかしながら、単純に全波整流波形をＬＥＤ列に印加するだけのＡＣ駆動型のＬＥＤ発光装置では、商用交流電源の実効値の変化に応じてＬＥＤに供給する電流が変動することから、明るさが変化してしまう。つまり、このようなＡＣ駆動型のＬＥＤ発光装置では、商用交流電源の実効値の変化に応じて、ＬＥＤに流れる電流が増減すると共に、ＬＥＤが発光する点灯期間（以下、全波整流波形の１周期に対する点灯期間の割合を「デューティ」と呼ぶ。）が増減する。また、電流制限回路を追加し、各ＬＥＤに流れる電流の上限値が設定される場合でも、デューティは、商用交流電源の実効値の変化に応じて増減し、明るさが変化する。例えば、商用交流電源の実効値が増加したとき、デューティも増加し、ＬＥＤはより明るく点灯する。 On the other hand, in many AC-driven LED light-emitting devices, a commercial AC power source is full-wave rectified and a full-wave rectified voltage (full-wave rectified waveform) is directly applied to the LED string, so that the power supply circuit is simple. It has the advantageous feature of However, in an AC-driven LED light-emitting device that simply applies a full-wave rectified waveform to the LED string, the current supplied to the LED varies according to the change in the effective value of the commercial AC power source, and therefore the brightness is low. It will change. That is, in such an AC drive type LED light emitting device, the current flowing through the LED increases or decreases according to the change in the effective value of the commercial AC power source, and the lighting period during which the LED emits light (hereinafter referred to as a full-wave rectified waveform 1 The ratio of the lighting period to the cycle is called "duty"). Further, even when a current limiting circuit is added and the upper limit value of the current flowing through each LED is set, the duty increases or decreases according to the change in the effective value of the commercial AC power supply, and the brightness changes. For example, when the effective value of the commercial AC power supply increases, the duty also increases, and the LED lights up brighter.
　そこで、この不具合を解消するため、国際公開第２０１７／０５７４０１号（以下「特許文献１」と呼ぶ）には、商用交流電源の実効値に応じてデューティが変動しても、明るさがほぼ一定になるＡＣ駆動型のＬＥＤ発光装置が提案されている。特許文献１の図１に記載されたＬＥＤ発光装置は、対策前は矩形波であった電流波形の頂部に窪みを設け（特許文献１の図２参照）、全波整流波形の振幅が大きくなり、デューティが増加したときに、全波整流波形の形状に応答して窪みを大きくしてＬＥＤに流れる電流を減らしている。すなわち、特許文献１の図１に記載されたＬＥＤ発光装置は、デューティが増加するときにＬＥＤに流れる電流（瞬時値）を減少し、デューティが減少するときにＬＥＤに流れる電流を増加することで、ＬＥＤに流れる平均電流（明るさ）を一定にしている。 Therefore, in order to eliminate this inconvenience, in International Publication No. 2017/057401 (hereinafter referred to as "Patent Document 1"), the brightness is substantially constant even if the duty varies depending on the effective value of the commercial AC power supply. The following AC drive type LED light emitting device has been proposed. The LED light-emitting device described in FIG. 1 of Patent Document 1 has a depression at the top of the current waveform that was a rectangular wave before the countermeasure (see FIG. 2 of Patent Document 1), and the amplitude of the full-wave rectified waveform becomes large. When the duty increases, the depression is increased in response to the shape of the full-wave rectified waveform to reduce the current flowing through the LED. That is, the LED light-emitting device described in FIG. 1 of Patent Document 1 reduces the current (instantaneous value) flowing through the LED when the duty increases and increases the current flowing through the LED when the duty decreases. , The average current (brightness) flowing through the LEDs is constant.
　ところが、特許文献１の図１に記載されたＬＥＤ発光装置は、電流波形が頂部の窪んだ矩形波となるため、ＴＨＤ（全高調波歪率）が大きくなる。そこで、ＴＨＤを軽減するため特許文献１の図１８には、商用交流電源の実効値の変化に応じて、ＬＥＤ電流の形状を矩形にしながら上限値を調整する（特許文献１の図１９参照）ＬＥＤ発光装置が記載されている。一般に実効値は全波整流波形の１周期に比べ著しく長い期間で変化するので、実効値に応じて上限電流を調整する特許文献１の図１８に記載されたＬＥＤ発光装置では、ＬＥＤ電流が窪みのない矩形波となる。この結果、特許文献１の図１８に記載されたＬＥＤ発光装置は、特許文献１の図１に記載されたＬＥＤ発光装置に比べ、ＴＨＤが減少する。 However, in the LED light emitting device described in FIG. 1 of Patent Document 1, the THD (total harmonic distortion factor) becomes large because the current waveform becomes a rectangular wave with a depressed top. Therefore, in order to reduce THD, in FIG. 18 of Patent Document 1, the upper limit value is adjusted while making the shape of the LED current rectangular according to the change in the effective value of the commercial AC power source (see FIG. 19 of Patent Document 1). An LED light emitting device is described. In general, the effective value changes in a significantly longer period than one cycle of the full-wave rectified waveform. Therefore, in the LED light emitting device described in FIG. 18 of Patent Document 1 in which the upper limit current is adjusted according to the effective value, the LED current has a depression. There is no square wave. As a result, the LED light emitting device shown in FIG. 18 of Patent Document 1 has a lower THD than the LED light emitting device shown in FIG. 1 of Patent Document 1.
　特許文献１の図１８に記載されたＬＥＤ発光装置は、実効値に応じてＬＥＤに流れる上限電流を調整するためオペアンプを使用していた。すなわち、オペアンプを使用するＬＥＤ発光装置は、ＬＥＤに電流を供給する電源以外に、オペアンプを駆動するための直流電源回路や基準電圧源、及びこれらのための実装領域や配線を備えることになり、電源回路が複雑化すると共に、大型化するという課題がある。 The LED light-emitting device shown in FIG. 18 of Patent Document 1 uses an operational amplifier to adjust the upper limit current flowing in the LED according to the effective value. That is, an LED light emitting device using an operational amplifier is provided with a DC power supply circuit for driving the operational amplifier, a reference voltage source, and a mounting area and wiring for these, in addition to a power supply for supplying a current to the LED. There is a problem that the power supply circuit becomes complicated and becomes large in size.
　そこで、本開示は、この課題に鑑みて為されたものであり、新たな直流電源を準備しなくても実効値の変化と反対方向にＬＥＤ電流を調整できるＬＥＤ発光装置を提供することを目的とする。 Therefore, the present disclosure has been made in view of this problem, and an object thereof is to provide an LED light emitting device that can adjust an LED current in a direction opposite to a change in an effective value without preparing a new DC power supply. And
　上記目的を解決するため、開示されるＬＥＤ発光装置は、電流を出力する端子と電流が戻る端子を有する整流回路と、第１端子と第２端子を有するＬＥＤ列と、電圧入力端子及び第１基準電圧出力端子を備える平滑回路と、第１電流入力端子、第１電流出力端子及び第１基準電圧入力端子を備える第１電流制限回路と、を備え、電流を出力する端子は、第１端子に接続し、第２端子は、第１電流入力端子に接続し、電圧入力端子は、電流を出力する端子から第２端子に至る電流経路に接続し、第１基準電圧出力端子は、第１基準電圧入力端子に接続し、第１電流出力端子は、電流が戻る端子に接続し、整流回路は、交流電圧を全波整流し、平滑回路は、電圧入力端子の電圧を平滑し、平滑した電圧を第１基準電圧出力端子から出力し、第１電流制限回路は、ＬＥＤ列に含まれるＬＥＤが発光しているとき、第１電流入力端子に流れる電流が第１基準電圧入力端子の電圧で調整されることを特徴とする。 In order to solve the above-mentioned object, a disclosed LED light-emitting device includes a rectifier circuit having a terminal for outputting a current and a terminal for returning the current, an LED array having a first terminal and a second terminal, a voltage input terminal, and a first terminal. A smoothing circuit having a reference voltage output terminal; and a first current limiting circuit having a first current input terminal, a first current output terminal and a first reference voltage input terminal, and a terminal for outputting a current is the first terminal , The second terminal is connected to the first current input terminal, the voltage input terminal is connected to the current path from the terminal that outputs the current to the second terminal, and the first reference voltage output terminal is the first reference voltage output terminal. Connected to the reference voltage input terminal, the first current output terminal is connected to the terminal to which the current returns, the rectifier circuit performs full-wave rectification of the AC voltage, and the smoothing circuit smoothes and smoothes the voltage at the voltage input terminal. The voltage is output from the first reference voltage output terminal, and when the LEDs included in the LED string emit light, the current flowing through the first current input terminal is the voltage at the first reference voltage input terminal. It is characterized by being adjusted.
　さらに、開示されるＬＥＤ発光装置では、第１電流制限回路は、第１制御端子に印加される電圧に応じて第１電流入力端子から第１電流出力端子の間を流れる第１電流を制御する第１電流制限素子と、第１電流入力端子に一端が接続し、第１制御端子に他端が接続する第１プルアップ抵抗と、第１基準電圧入力端子に一端が接続する第１入力抵抗と、第１入力抵抗の他端に一端が接続し、第１電流制限素子の電流出力端子に他端が接続する第１出力抵抗と、第１電流出力端子の他端に一端が接続する第１検出抵抗と、第１プルアップ抵抗に可変抵抗部が直列接続される第１制御素子と、を備え、第１制御素子は、第１入力抵抗の他端及び第１出力抵抗の一端に接続する第２基準電圧端子を有し、第２基準電圧端子の電圧が第２基準電圧と一致するように可変抵抗部の抵抗を変化して第１制御端子の電圧を制御することが好ましい。 Further, in the disclosed LED light emitting device, the first current limiting circuit controls the first current flowing between the first current input terminal and the first current output terminal according to the voltage applied to the first control terminal. A first current limiting element, a first pull-up resistor having one end connected to the first current input terminal and the other end connected to the first control terminal, and a first input resistor having one end connected to the first reference voltage input terminal. A first output resistor whose one end is connected to the other end of the first input resistor and whose other end is connected to the current output terminal of the first current limiting element; and a first output resistor whose one end is connected to the other end of the first current output terminal. 1 detection resistor and a first control element in which a variable resistance portion is connected in series to the first pull-up resistor, the first control element being connected to the other end of the first input resistor and one end of the first output resistor. It is preferable to control the voltage of the first control terminal by changing the resistance of the variable resistance unit so that the voltage of the second reference voltage terminal matches the second reference voltage.
　さらに、開示されるＬＥＤ発光装置では、第１制御素子の可変抵抗部に並列接続された第１並列抵抗を更に有することが好ましい。 Furthermore, it is preferable that the disclosed LED light-emitting device further has a first parallel resistance connected in parallel to the variable resistance portion of the first control element.
　さらに、開示されるＬＥＤ発光装置では、第１電流制限回路は、第１出力抵抗に並列接続されたチャタリング防止コンデンサを更に有することが好ましい。 Furthermore, in the disclosed LED light emitting device, it is preferable that the first current limiting circuit further includes a chattering prevention capacitor connected in parallel to the first output resistor.
　さらに、開示されるＬＥＤ発光装置は、並列接続された複数の第１電流制限回路を有することが好ましい。 Further, the disclosed LED light emitting device preferably has a plurality of first current limiting circuits connected in parallel.
　さらに、開示されるＬＥＤ発光装置では、第１電流制限素子は、並列接続された複数のＦＥＴを含むことが好ましい。 Further, in the disclosed LED light emitting device, the first current limiting element preferably includes a plurality of FETs connected in parallel.
　さらに、開示されるＬＥＤ発光装置は、複数のＬＥＤの最終段のＬＥＤ以外のＬＥＤである第２接続ＬＥＤのカソードに接続する第３端子と、第１電流入力端子、第２電流入力端子、第１基準電圧入力端子、及び第２電流出力端子を備える第２電流制限回路を更に有し、第１電流入力端子は、第１電流制限回路の第１電流出力端子と接続し、第２電流入力端子は、第３端子と接続し、第１基準電圧入力端子は、平滑回路の第１基準電圧出力端子に接続し、第２電流出力端子は、第１電流入力端子及び第２電流入力端子から流入した電流を出力し、第１電圧基準電圧入力端子の電圧は、第２電流入力端子に流れる電流を調整することが好ましい。 Further, the disclosed LED light-emitting device has a third terminal connected to the cathode of a second connection LED that is an LED other than the final-stage LED of the plurality of LEDs, a first current input terminal, a second current input terminal, and a third current input terminal. A second current limiting circuit having a first reference voltage input terminal and a second current output terminal is further provided, the first current input terminal is connected to the first current output terminal of the first current limiting circuit, and the second current input terminal is connected. The terminal is connected to the third terminal, the first reference voltage input terminal is connected to the first reference voltage output terminal of the smoothing circuit, and the second current output terminal is connected to the first current input terminal and the second current input terminal. It is preferable that the inflowing current is output and the voltage of the first voltage reference voltage input terminal adjusts the current flowing to the second current input terminal.
　さらに、開示されるＬＥＤ発光装置では、第２制御端子に印加される電圧に応じて、第２電流入力端子から流れ込む第２電流を制御する第２電流制限素子と、第２電流入力端子に一端が接続し、第２制御端子に他端が接続する第２プルアップ抵抗と、第１基準電圧入力端子に一端が接続する第２入力抵抗と、第２入力抵抗の他端に一端が接続し、第１電流入力端子に他端が接続する第２出力抵抗と、第２電流制限素子の電流出力端子及び第１電流入力端子に一端が接続し、他端が第２電流出力端子に接続する第２検出抵抗と、第２プルアップ抵抗に可変抵抗部が直列接続される第２制御素子と、を有し、第２制御素子は、第２入力抵抗の他端及び第２出力抵抗の一端に接続する第２基準電圧端子を有し、第２基準電圧端子の電圧が第２基準電圧と一致するように可変抵抗部の抵抗を変化して第２制御端子の電圧を制御することが好ましい。 Further, in the disclosed LED light emitting device, a second current limiting element that controls the second current flowing from the second current input terminal according to the voltage applied to the second control terminal, and one end of the second current limiting terminal. Is connected to the second control terminal, the other end is connected to the second pull-up resistor, the first reference voltage input terminal is connected to the second input resistor at one end, and the second input resistor is connected to the other end at one end. , A second output resistor having the other end connected to the first current input terminal, one end connected to the current output terminal and the first current input terminal of the second current limiting element, and the other end connected to the second current output terminal It has a 2nd detection resistance and the 2nd control element by which a variable resistance part is connected in series to the 2nd pull-up resistance, and the 2nd control element has the other end of the 2nd input resistance and one end of the 2nd output resistance. It is preferable to control the voltage of the second control terminal by changing the resistance of the variable resistance unit so that the voltage of the second reference voltage terminal matches the second reference voltage. ..
　さらに、開示されるＬＥＤ発光装置は、整流回路の電流を出力する端子と複数のＬＥＤの初段のＬＥＤのアノードとの間に一端が接続する電流制限抵抗と、電流制限抵抗の他端にカソードが接続し、整流回路の電流が戻る端子にアノードが接続するツェナーダイオードと、電流制限抵抗の他端にゲートが接続し、第１電流制限回路にソースが接続し、整流回路の電流が戻る端子にドレインが接続する電流制限ＦＥＴと、を有する過電流防止回路を更に有することが好ましい。 Further, the disclosed LED light-emitting device has a current limiting resistor having one end connected between the terminal for outputting the current of the rectifying circuit and the anode of the first-stage LED of the plurality of LEDs, and a cathode at the other end of the current limiting resistor. Connect the Zener diode whose anode is connected to the terminal where the current of the rectifier circuit returns, the gate is connected to the other end of the current limiting resistor, the source is connected to the first current limiting circuit, and the terminal where the current of the rectifier circuit returns It is preferable to further include an overcurrent prevention circuit having a current limiting FET connected to the drain.
　さらに、開示されるＬＥＤ発光装置では、ＬＥＤ列は、直列接続された複数のＬＥＤを含む第１ＬＥＤ群と、直列接続された複数のＬＥＤを含む第２ＬＥＤ群と、第１ＬＥＤ群の初段のアノード及び第２ＬＥＤ群の初段のアノードのそれぞれに接続する配線が分岐する第１分岐点と、第１ＬＥＤ群の最終段のカソード及び第２ＬＥＤ群の最終段のカソードのそれぞれに接続する配線が分岐する第２分岐点と、第１ＬＥＤ群の最終段のカソードと第２ＬＥＤ群の初段のアノードとの間に切断可能に配置された並列用切換素子と、第２ＬＥＤ群の初段のアノードと第１分岐点との間に切断可能に配置された第１直列用切換素子と、第１ＬＥＤ群の最終段のカソードと第２分岐点との間に切断可能に配置された第２直列用切換素子とを有することが好ましい。 Further, in the disclosed LED light-emitting device, the LED array includes a first LED group including a plurality of LEDs connected in series, a second LED group including a plurality of LEDs connected in series, an anode at a first stage of the first LED group, and A first branch point at which a wiring connected to each of the first-stage anodes of the second LED group branches, and a second branch at which a wiring connected to each of the last-stage cathode of the first LED group and the last-stage cathode of the second LED group branches A branching point, a switching element for parallel connection cutably arranged between the cathode of the last stage of the first LED group and the anode of the first stage of the second LED group, and the anode of the first stage of the second LED group and the first branching point. A first series switching element that is severably disposed between the first LED group and a second series switching element that is severably disposed between the final stage cathode of the first LED group and the second branch point. preferable.
　さらに、開示されるＬＥＤ発光装置は、ＬＥＤ列に並列接続された並列コンデンサと、ＬＥＤ列の初段のアノード及び並列コンデンサと整流回路との間に配置された逆流防止ダイオードとを更に有することが好ましい。 Furthermore, it is preferable that the disclosed LED light-emitting device further includes a parallel capacitor connected in parallel to the LED string, and a backflow prevention diode arranged between the first stage anode and the parallel capacitor of the LED string and the rectifier circuit. ..
　開示されるＬＥＤ発光装置は、良く知られた電流制限回路の負帰還制御部に、商用電源の実効値変動に係る情報を重畳し、電流制限回路の上限電流を調整する。すなわち、これまでの電流制限回路は、流入する電流について負帰還制御して上限電流を制限していたところ、開示されるＬＥＤ発光装置では、実効値変動に係る情報を第１基準電圧として提供する平滑回路を設け、電流制限回路の負帰還部に第１基準電圧を加算することで、電流制限回路に流入する電流に係る情報及び実効値に係る情報に基づく負帰還制御を行い、電流制限回路の上限電流を設定している。このとき、平滑回路は、良く知られているように抵抗やコンデンサで構成できる。また、負帰還部に第１基準電圧を加算することは、抵抗のネットワークで実現できる。さらに、負帰還制御部を構成する反転増幅器は、ＬＥＤ列に電流が流れないとき電流制限素子を制御しなくて良いため、電源をＬＥＤ列からとることができる。この結果、開示されるＬＥＤ発光装置は、新たな直流電源を準備しなくても実効値の変化と反対方向にＬＥＤ電流を調整できる。 The disclosed LED light-emitting device adjusts the upper limit current of the current limiting circuit by superimposing information on the effective value fluctuation of the commercial power source on the well-known negative feedback control unit of the current limiting circuit. That is, the current limiter circuit up to now limits the upper limit current by performing negative feedback control on the inflowing current, but the disclosed LED light-emitting device provides the information regarding the effective value variation as the first reference voltage. By providing a smoothing circuit and adding the first reference voltage to the negative feedback portion of the current limiting circuit, negative feedback control is performed based on the information relating to the current flowing into the current limiting circuit and the information relating to the effective value. The upper limit current of is set. At this time, the smoothing circuit can be configured by resistors and capacitors, as is well known. Also, adding the first reference voltage to the negative feedback section can be realized by a network of resistors. Further, since the inverting amplifier forming the negative feedback control unit does not have to control the current limiting element when no current flows through the LED string, the power can be taken from the LED string. As a result, the disclosed LED light emitting device can adjust the LED current in the direction opposite to the change in the effective value without preparing a new DC power supply.
第１実施形態としてＬＥＤ発光装置のブロック図である。It is a block diagram of an LED light-emitting device as a first embodiment. 図１に示すＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device shown in FIG. 図１及び２に示すＬＥＤ発光装置の回路における波形図である。FIG. 3 is a waveform diagram in the circuit of the LED light emitting device shown in FIGS. 1 and 2. 第２実施形態として示すＬＥＤ発光装置の回路図である。It is a circuit diagram of an LED light emitting device shown as a second embodiment. 図４に示すＬＥＤ発光装置の回路における波形図である。It is a wave form diagram in the circuit of the LED light-emitting device shown in FIG. 第３実施形態として示すＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device shown as 3rd Embodiment. 図６に示すＬＥＤ発光装置の回路における波形図である。It is a wave form diagram in the circuit of the LED light-emitting device shown in FIG. 第４実施形態として示すＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device shown as 4th Embodiment. 図８に示すＬＥＤ発光装置の回路における波形図である。It is a wave form diagram in the circuit of the LED light-emitting device shown in FIG. 第５実施形態に係るＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device which concerns on 5th Embodiment. 第６実施形態に係るＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device which concerns on 6th Embodiment. 第７実施形態に係るＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device which concerns on 7th Embodiment. 第８実施形態に係るＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device which concerns on 8th Embodiment. （ａ）は、ＬＥＤ列の入力端子の電圧の１周期当たりの経時変化を示す図であり、（ｂ）は、ＬＥＤ列の出力端子の電圧の１周期当たりの経時変化を示す図である。(A) is a figure which shows the time-dependent change per cycle of the voltage of the input terminal of an LED row, and (b) is a figure which shows the time-dependent change per cycle of the voltage of the output terminal of an LED row. 図１３に示すＬＥＤ発光装置に入力される交流電圧の実効値と、平滑回路によって平滑化された電圧との関係を示す図である。It is a figure which shows the relationship between the effective value of the alternating voltage input into the LED light-emitting device shown in FIG. 13, and the voltage smoothed by the smoothing circuit. 第９実施形態に係るＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device which concerns on 9th Embodiment. 第１０実施形態に係るＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device which concerns on 10th Embodiment. （ａ）は、図１７に示すＬＥＤ発光装置の斜視図であり、（ｂ）は、図１７に示すＬＥＤ発光装置の平面図であり、（ｃ）は、図１７に示すＬＥＤ発光装置の側面図である。17A is a perspective view of the LED light emitting device shown in FIG. 17, FIG. 17B is a plan view of the LED light emitting device shown in FIG. 17, and FIG. 17C is a side view of the LED light emitting device shown in FIG. It is a figure. 第１０実施形態に係るＬＥＤ発光装置の変形例に係るＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device which concerns on the modification of the LED light-emitting device which concerns on 10th Embodiment.
　以下、図１～１９を参照しながら好適な実施形態について詳細に説明する。なお、図面の説明において、同一又は相当要素には同一の符号を付し、重複する説明は省略する。 Hereinafter, a preferred embodiment will be described in detail with reference to FIGS. In the description of the drawings, the same or corresponding elements will be denoted by the same reference symbols, without redundant description.
　（第１実施形態）
　図１は、第１実施形態として示すＬＥＤ発光装置１のブロック図であり、図２は、ＬＥＤ発光装置１の回路図である。図１及び２に示すように、ＬＥＤ発光装置１は、整流回路１０１と、ＬＥＤ列１１と、平滑回路１２と、第１電流制限回路１３とを有する。説明のため、図２において、ＬＥＤ発光装置１に交流電圧を供給する商用交流電源１００が記される（以下同様）。 (First embodiment)
FIG. 1 is a block diagram of an LED light emitting device 1 shown as a first embodiment, and FIG. 2 is a circuit diagram of the LED light emitting device 1. As shown in FIGS. 1 and 2, the LED light emitting device 1 includes a rectifying circuit 101, an LED array 11, a smoothing circuit 12, and a first current limiting circuit 13. For the sake of explanation, in FIG. 2, a commercial AC power supply 100 that supplies an AC voltage to the LED light emitting device 1 is shown (the same applies hereinafter).
　整流回路１０１は、４個のダイオード１０ａ、１０ｂ、１０ｃ、１０ｄを有し、商用交流電源１００が供給する交流電圧を全波整流する。商用交流電源１００は、ダイオード１０ａ、１０ｂのアノード及びダイオード１０ｃ、１０ｄのカソード（整流回路１０１の入力端子）に接続する。ダイオード１０ａ、１０ｂのカソードは、整流回路１０１の電流を出力する端子であり、ダイオード１０ｃ、１０ｄのアノードは、整流回路１０１の電流が戻る端子であり、ＬＥＤ発光装置１のグランドレベルになる。整流回路１０１は、商用交流電源１００から供給される交流電圧を全波整流し、負荷に出力する。整流回路１０１の負荷が抵抗であるとき、整流回路１０１の出力端子の間の電圧は、全波整流波形となる。 The rectifier circuit 101 has four diodes 10a, 10b, 10c, and 10d, and full-wave rectifies the AC voltage supplied by the commercial AC power supply 100. The commercial AC power supply 100 is connected to the anodes of the diodes 10a and 10b and the cathodes of the diodes 10c and 10d (the input terminals of the rectifier circuit 101). The cathodes of the diodes 10a and 10b are terminals that output the current of the rectifier circuit 101, and the anodes of the diodes 10c and 10d are terminals to which the current of the rectifier circuit 101 returns, and are at the ground level of the LED light emitting device 1. The rectifier circuit 101 performs full-wave rectification on the AC voltage supplied from the commercial AC power supply 100 and outputs it to the load. When the load of the rectifier circuit 101 is a resistor, the voltage between the output terminals of the rectifier circuit 101 has a full-wave rectified waveform.
　ＬＥＤ列１１は、直列接続した複数のＬＥＤ１１０を含み、初段のＬＥＤ１１０のアノード（以下「第１端子」という）は、整流回路１０１の電流を出力する端子と接続する。なお、ＬＥＤ列１１の最終段のＬＥＤ１１０のカソードを「第２端子」とする。ＬＥＤ列１１の第１端子には、整流回路１０１が全波整流した電圧が印加される。 The LED string 11 includes a plurality of LEDs 110 connected in series, and the anode (hereinafter, referred to as “first terminal”) of the first-stage LED 110 is connected to the terminal that outputs the current of the rectifier circuit 101. The cathode of the LED 110 at the final stage of the LED row 11 is referred to as the "second terminal". A voltage that is full-wave rectified by the rectifying circuit 101 is applied to the first terminal of the LED string 11.
　平滑回路１２は、第１平滑抵抗２１と、第２平滑抵抗２２と、平滑コンデンサ２３とを有し、第１平滑抵抗２１の左端が電圧入力端子、右端が第１基準電圧出力端子、第２平滑抵抗２２及び平滑コンデンサ２３の下端が平滑回路１２のグランド端子となる（図１及び図２参照）。 平滑回路１２は、第１平滑抵抗２１を介して入力する電圧（全波整流波形と同期して変動する電圧）を平滑化した第１基準電圧を生成し、生成した第１基準電圧を第１基準電圧出力端子から出力する。第１平滑抵抗２１の一端（電圧入力端子）は、ＬＥＤ列１１の最終段のＬＥＤ１１０のカソードである第２端子に接続し、第１平滑抵抗２１の他端（第1基準電圧出力端子）は、第２平滑抵抗２２及び平滑コンデンサ２３の一端に接続する。第２平滑抵抗２２は、第１平滑抵抗２１に直列接続し、平滑コンデンサ２３は、第２平滑抵抗２２に並列接続する。第１平滑抵抗２１の他端、第２平滑抵抗２２及び平滑コンデンサ２３の一端である第１基準電圧出力端子の電圧が第１基準電圧となる。また、平滑回路１２は、第１平滑抵抗２１を介して平滑コンデンサ２３に電荷を充電し、第２平滑抵抗２２を介して平滑コンデンサ２３に充電された電荷を放電する。平滑回路１２の第１基準電圧出力端子から出力される第１基準電圧は、ＬＥＤ列１１の第１出力端子から出力される電圧を第１平滑抵抗２１と第２平滑抵抗２２で分圧し、これを平均化した電圧とも言える。すなわち、第１基準電圧は、商用交流電源１００の実効値の変化に応じて変化する。商用交流電源１００の実効値が高くなると、第１基準電圧は高くなり、商用交流電源１００の実効値が低くなると、第１基準電圧は低くなる。 The smoothing circuit 12 has a first smoothing resistor 21, a second smoothing resistor 22, and a smoothing capacitor 23. The left end of the first smoothing resistor 21 has a voltage input terminal, the right end has a first reference voltage output terminal, and a second reference voltage output terminal. The lower ends of the smoothing resistor 22 and the smoothing capacitor 23 become the ground terminals of the smoothing circuit 12 (see FIGS. 1 and 2). The smoothing circuit 12 generates a first reference voltage obtained by smoothing a voltage (voltage that changes in synchronization with the full-wave rectified waveform) input via the first smoothing resistor 21, and generates the first reference voltage as a first reference voltage. Output from the reference voltage output terminal. One end (voltage input terminal) of the first smoothing resistor 21 is connected to the second terminal that is the cathode of the LED 110 at the final stage of the LED string 11, and the other end (first reference voltage output terminal) of the first smoothing resistor 21 is connected. , The second smoothing resistor 22 and the smoothing capacitor 23 are connected to one end thereof. The second smoothing resistor 22 is connected in series with the first smoothing resistor 21, and the smoothing capacitor 23 is connected in parallel with the second smoothing resistor 22. The voltage of the first reference voltage output terminal, which is the other end of the first smoothing resistor 21, the one ends of the second smoothing resistor 22 and the smoothing capacitor 23, becomes the first reference voltage. Further, the smoothing circuit 12 charges the smoothing capacitor 23 via the first smoothing resistor 21 and discharges the charge charged on the smoothing capacitor 23 via the second smoothing resistor 22. The first reference voltage output from the first reference voltage output terminal of the smoothing circuit 12 divides the voltage output from the first output terminal of the LED string 11 by the first smoothing resistor 21 and the second smoothing resistor 22, It can be said that the averaged voltage. That is, the first reference voltage changes according to the change in the effective value of the commercial AC power supply 100. When the effective value of the commercial AC power supply 100 is high, the first reference voltage is high, and when the effective value of the commercial AC power supply 100 is low, the first reference voltage is low.
　第１電流制限回路１３は、第１ＦＥＴ３０（第１電流制限素子）と、第１プルアップ抵抗３１と、第１入力抵抗３２と、第１出力抵抗３３と、第１検出抵抗３４と、第１トランジスタ３５（第１制御素子）と、第１チャタリング防止コンデンサ３６とを有する。第１電流制限回路１３は、第１電流入力端子がＬＥＤ列１１の第２端子、及び第１電流出力端子が整流回路の電流が戻る端子に接続し、予め設定された上限電流（第１基準電圧入力端子をオープンとしたとき設定される上限電流）が、全波整流された電圧（又は商用電源の実効値）に応じて変化する第１基準電圧により調整される。このとき、パルス波形が矩形状の第１電流が複数のＬＥＤ１１０のそれぞれに流れる。 The first current limiting circuit 13 includes a first FET 30 (first current limiting element), a first pull-up resistor 31, a first input resistor 32, a first output resistor 33, a first detecting resistor 34, and a first detecting resistor 34. It has a transistor 35 (first control element) and a first chattering prevention capacitor 36. In the first current limiting circuit 13, the first current input terminal is connected to the second terminal of the LED array 11, and the first current output terminal is connected to the terminal to which the current of the rectifier circuit returns, and the preset upper limit current (first reference value) The upper limit current set when the voltage input terminal is opened) is adjusted by the first reference voltage that changes according to the full-wave rectified voltage (or the effective value of the commercial power supply). At this time, the first current having a rectangular pulse waveform flows through each of the plurality of LEDs 110.
　第１電流制限回路１３は、新たな直流電源から電力が供給されるオペアンプを使用することなく、ＦＥＴ、抵抗、トランジスタ及びコンデンサ等のいわゆるディスクリート品で構成され、整流回路１０１からＬＥＤ列１１を介して印加される電圧によって駆動される。 The first current limiting circuit 13 is made up of so-called discrete products such as FETs, resistors, transistors, and capacitors without using an operational amplifier to which power is supplied from a new DC power source, and from the rectifying circuit 101 to the LED array 11 through. Driven by the applied voltage.
　第１ＦＥＴ３０のゲートは、第１プルアップ抵抗３１及び第１トランジスタ３５のコレクタに接続する。第１ＦＥＴ３０のドレイン（第１電流入力端子を構成する）は、ＬＥＤ列１１の第２端子及び第１平滑抵抗２１の一端に接続する。第１ＦＥＴ３０のドレインは、ＬＥＤ列１１から電流が入力される第１電流入力端子であり、第１ＦＥＴ３０のソースは、ドレインとの間に第１電流が流れる第１ＦＥＴの電流出力端子である。また、第１ＦＥＴ３０のゲートは、印加される電圧に応じて第１電流を制御する第１制御端子である。 The gate of the first FET 30 is connected to the first pull-up resistor 31 and the collector of the first transistor 35. The drain of the first FET 30 (which constitutes a first current input terminal) is connected to the second terminal of the LED array 11 and one end of the first smoothing resistor 21. The drain of the first FET 30 is a first current input terminal to which a current is input from the LED array 11, and the source of the first FET 30 is a current output terminal of the first FET through which the first current flows. The gate of the first FET 30 is a first control terminal that controls the first current according to the applied voltage.
　第１プルアップ抵抗３１の一端（第１ＦＥＴ３０のドレインとともに第１電流入力端子を構成する）は、ＬＥＤ列１１の第２端子に接続し、第１プルアップ抵抗３１の他端は、第１ＦＥＴ３０のゲート及び第１トランジスタ３５のコレクタに接続する。 One end of the first pull-up resistor 31 (which constitutes the first current input terminal together with the drain of the first FET 30) is connected to the second terminal of the LED string 11, and the other end of the first pull-up resistor 31 is connected to the first FET 30. It is connected to the gate and the collector of the first transistor 35.
　第１入力抵抗３２の一端（第１基準電圧入力端子）は、平滑回路１２の第１基準電圧出力端子に接続し、第１入力抵抗３２の他端は、第１出力抵抗３３の一端に接続する。第１出力抵抗３３の他端は、第１検出抵抗３４の一端と接続する。 One end (first reference voltage input terminal) of the first input resistor 32 is connected to the first reference voltage output terminal of the smoothing circuit 12, and the other end of the first input resistor 32 is connected to one end of the first output resistor 33. To do. The other end of the first output resistor 33 is connected to one end of the first detection resistor 34.
　第１検出抵抗３４の一端は、第１ＦＥＴ３０のソース及び平滑回路１２の平滑回路のグランド端子に接続し、第１検出抵抗３４の他端（第１電流出力端子を構成する）は、整流回路１０１の電流が戻る端子に接続する。なお、平滑回路１２のグランド端子は、整流回路１０１の電流が戻る端子に接続しても良いが、この場合に比べて、第１検出抵抗３４の他端に接続することで負帰還制御に係る応答性を改善している。 One end of the first detection resistor 34 is connected to the source of the first FET 30 and the ground terminal of the smoothing circuit of the smoothing circuit 12, and the other end of the first detection resistor 34 (which constitutes the first current output terminal) is connected to the rectifier circuit 101. Connect to the terminal where the current of returns. The ground terminal of the smoothing circuit 12 may be connected to the terminal to which the current of the rectifier circuit 101 returns, but in comparison with this case, the ground terminal of the smoothing circuit 12 is connected to the other end of the first detection resistor 34 to perform negative feedback control. The responsiveness is improved.
　第１トランジスタ３５のコレクタは、第１プルアップ抵抗３１の他端及び第１ＦＥＴ３０のゲートに接続し、第１トランジスタ３５のエミッタは、整流回路１０１の電流が戻る端子及び第１検出抵抗３４の他端に接続する。第１トランジスタ３５のベースは、第１入力抵抗３２の他端及び第１出力抵抗３３の一端に接続し、第２基準電圧端子を構成する。 The collector of the first transistor 35 is connected to the other end of the first pull-up resistor 31 and the gate of the first FET 30, and the emitter of the first transistor 35 is connected to the terminal to which the current of the rectifier circuit 101 returns and the first detection resistor 34. Connect to the end. The base of the first transistor 35 is connected to the other end of the first input resistor 32 and one end of the first output resistor 33 to form a second reference voltage terminal.
　第１トランジスタ３５のベースの電圧は、負帰還が正常に動作するとき、整流回路１０１の電流が戻る端子の電圧であるグランド電圧から第１トランジスタ３５のベース－エミッタ間電圧（約０．６Ｖ）分高い電圧である。なお、ベース－エミッタ間電圧が第２基準電圧となる。 The base voltage of the first transistor 35 is a voltage between the base and the emitter of the first transistor 35 (about 0.6 V) from the ground voltage which is the voltage of the terminal to which the current of the rectifier circuit 101 returns when the negative feedback operates normally. It is a high voltage. The base-emitter voltage becomes the second reference voltage.
　第１トランジスタ３５のコレクタ－エミッタ間は、第１プルアップ抵抗３１と直列接続される可変抵抗部である。第１トランジスタ３５（第１制御素子）は、ベースである第２基準電圧端子の電圧が第２基準電圧（約０．６Ｖ）となるように可変抵抗部の抵抗を変化させて、第１ＦＥＴ３０のゲートの電圧を制御する。 Between the collector and the emitter of the first transistor 35 is a variable resistance section connected in series with the first pull-up resistor 31. The first transistor 35 (first control element) changes the resistance of the variable resistance part so that the voltage of the second reference voltage terminal, which is the base, becomes the second reference voltage (about 0.6 V), and the first FET 30 of the first FET 30 is changed. Controls the gate voltage.
　第１チャタリング防止コンデンサ３６は、第１出力抵抗３３に並列接続し、第１ＦＥＴ３０の動作と第１トランジスタ３５の動作とのタイミングのずれに起因してチャタリングが発生することを防止する。 The first chattering prevention capacitor 36 is connected in parallel to the first output resistor 33, and prevents chattering from occurring due to the timing difference between the operation of the first FET 30 and the operation of the first transistor 35.
　次に、図３を参照して図１及び２に示したＬＥＤ発光装置１の動作を説明する。図３は、ＬＥＤ発光装置１に流れる電流の説明図であり、（ａ）は、一周期分の全波整流波形を示し、（ｂ）は、ＬＥＤ列１１に流れる電流を示す。図３（ａ）において、縦軸Ｖは、電圧であり、横軸ｔは、時間である。図３（ｂ）において、縦軸Ｉは、電流であり、横軸ｔは、時間である。なお、図３（ａ）、３（ｂ）の横軸ｔは対応している。また、図３の説明にあたり、特別な指示をすることなく図１及び２を参照する。 Next, the operation of the LED light emitting device 1 shown in FIGS. 1 and 2 will be described with reference to FIG. 3A and 3B are explanatory diagrams of a current flowing through the LED light emitting device 1. FIG. 3A shows a full-wave rectified waveform for one cycle, and FIG. 3B shows a current flowing through the LED string 11. In FIG. 3A, the vertical axis V is voltage and the horizontal axis t is time. In FIG. 3B, the vertical axis I is the current and the horizontal axis t is the time. The horizontal axes t in FIGS. 3A and 3B correspond to each other. Further, in describing FIG. 3, reference is made to FIGS. 1 and 2 without giving special instructions.
　なお、第１平滑抵抗２１、第２平滑抵抗２２、第１プルアップ抵抗３１、第１入力抵抗３２及び第１出力抵抗３３に流れる電流は、第１ＦＥＴ３０のドレイン電流及び第１検出抵抗３４を流れる電流に比べ著しく小さい。そこで、平滑回路１２及び第１電流制限回路１３に流れる電流は、特別に明示する場合に説明され、平滑回路１２及び第１電流制限回路１３の電圧を参照してＬＥＤ発光装置１の動作が説明される。 The current flowing through the first smoothing resistor 21, the second smoothing resistor 22, the first pull-up resistor 31, the first input resistor 32, and the first output resistor 33 flows through the drain current of the first FET 30 and the first detection resistor 34. Remarkably smaller than the current. Therefore, the current flowing through the smoothing circuit 12 and the first current limiting circuit 13 will be described in the case where it is specified explicitly, and the operation of the LED light emitting device 1 will be described with reference to the voltages of the smoothing circuit 12 and the first current limiting circuit 13. To be done.
　図３（ａ）において、全波整流波形２０１は、実効値が１００Ｖ（通常状態）の状態を示し、全波整流波形２０２は、実効値が１２０Ｖの状態を示し、全波整流波形２０３は、実効値が８０Ｖの状態を示す。実効値１００Ｖの全波整流波形２０１が標準的な状態であり、全波整流波形２０２及び２０３は何らかの原因で商用交流電源１００の電圧が変動した状態である。 In FIG. 3A, the full-wave rectified waveform 201 shows a state where the effective value is 100V (normal state), the full-wave rectified waveform 202 shows a state where the effective value is 120V, and the full-wave rectified waveform 203 shows The effective value is 80V. The full-wave rectified waveform 201 having an effective value of 100 V is in a standard state, and the full-wave rectified waveforms 202 and 203 are in a state in which the voltage of the commercial AC power supply 100 fluctuates for some reason.
　図３（ａ）において、電圧Ｖｔは、ＬＥＤ列１１に含まれる複数のＬＥＤ１１０の全てが発光する電圧である閾値電圧（以下「閾値Ｖｔ」という）を示す。ＬＥＤ列１１に印加される電圧が閾値Ｖｔ未満であるとき、ＬＥＤ列１１の含まれるＬＥＤ１１０に電流が流れず、ＬＥＤ列１１に印加される電圧が閾値Ｖｔ以上であるとき、ＬＥＤ列１１の含まれるＬＥＤ１１０に電流が流れる。閾値Ｖｔは、ＬＥＤ列１１において直列接続する各ＬＥＤ１１０の順方向電圧ドロップを合計した電圧である。また、ＬＥＤ列１１において、各ＬＥＤ１１０の特性が全て等しいとき、閾値Ｖｔは、ＬＥＤ１１０の順方向ドロップとＬＥＤ１１０の直列段数の積である。 In FIG. 3A, the voltage Vt indicates a threshold voltage (hereinafter referred to as “threshold Vt”) that is a voltage at which all of the plurality of LEDs 110 included in the LED string 11 emit light. When the voltage applied to the LED string 11 is less than the threshold value Vt, no current flows in the LED 110 included in the LED string 11, and when the voltage applied to the LED string 11 is equal to or higher than the threshold value Vt, the LED string 11 is included. A current flows through the LED 110 that is turned on. The threshold value Vt is a total voltage of forward voltage drops of the LEDs 110 connected in series in the LED string 11. Further, in the LED array 11, when all the characteristics of the LEDs 110 are the same, the threshold value Vt is the product of the forward drop of the LED 110 and the number of series stages of the LEDs 110.
　図３（ｂ）において、電流波形２０４は、図３（ａ）で示した全波整流波形２０１に応じてＬＥＤ発光装置１に流れる電流を示す。電流波形２０５、２０６は、それぞれ全波整流波形２０２、２０３に対応してＬＥＤ発光装置１に流れる電流を示す。 In FIG. 3B, the current waveform 204 shows the current flowing through the LED light emitting device 1 according to the full-wave rectified waveform 201 shown in FIG. Current waveforms 205 and 206 indicate currents flowing through the LED light emitting device 1 corresponding to the full-wave rectified waveforms 202 and 203, respectively.
　図３（ｂ）に示すように、電流波形２０４が示す電流は、全波整流波形２０１の電圧が閾値Ｖｔより低い期間で０（Ａ）である。全波整流波形２０１の電圧が上昇する位相では、電流波形２０４が示す電流は、全波整流波形２０１の電圧が閾値Ｖｔまで上昇すると急激に増加する。全波整流波形２０１の電圧が閾値Ｖｔよりも高い位相では、電流波形２０４が示す電流は、上限値が制限されて一定値になる（全波整流波形２０１の電圧が閾値Ｖｔよりも高い位相では、電流波形２０４の形状が平坦となる）。全波整流波形２０１の電圧が下降する位相では、電流波形２０４が示す電流は、全波整流波形２０１の電圧が閾値Ｖｔまで下降すると急激に減少する。全波整流波形２０１の１周期に対応するＬＥＤ列１１の電流波形２０４の形状は、略矩形となる。 As shown in FIG. 3B, the current indicated by the current waveform 204 is 0 (A) in the period when the voltage of the full-wave rectified waveform 201 is lower than the threshold value Vt. In the phase in which the voltage of the full-wave rectified waveform 201 rises, the current represented by the current waveform 204 rapidly increases when the voltage of the full-wave rectified waveform 201 rises to the threshold value Vt. In a phase where the voltage of the full-wave rectified waveform 201 is higher than the threshold value Vt, the current shown by the current waveform 204 has a fixed upper limit value (in the phase where the voltage of the full-wave rectified waveform 201 is higher than the threshold value Vt). , The shape of the current waveform 204 becomes flat). In the phase where the voltage of the full-wave rectified waveform 201 drops, the current represented by the current waveform 204 sharply decreases when the voltage of the full-wave rectified waveform 201 drops to the threshold value Vt. The shape of the current waveform 204 of the LED array 11 corresponding to one cycle of the full-wave rectified waveform 201 is substantially rectangular.
　同様に、実効値が異なる全波整流波形２０２、２０３に対しても、ＬＥＤ列１１の電流波形２０５、２０６の形状は略矩形となる。 Similarly, for the full-wave rectified waveforms 202 and 203 having different effective values, the current waveforms 205 and 206 of the LED array 11 are substantially rectangular.
　しかしながら、ＬＥＤ列１１に全波整流波形２０１より実効値の大きい全波整流波形２０２が印加されると、電流波形２０５は、電流波形２０４に比べ、デューティが大きくなる一方で、ピーク値が電流波形２０４に比べて低下する。すなわち、全波整流波形２０２がＬＥＤ列１１に印加されるとき、ＬＥＤ発光装置１は、通常状態に比べ、ＬＥＤ列１１に含まれる複数のＬＥＤ１１０の点灯期間が長くなる一方で、ＬＥＤ列１１に含まれる複数のＬＥＤ１１０の点灯時における輝度を低下させる。この結果、ＬＥＤ発光装置１は、ＬＥＤ列１１に印加する電圧波形が全波整流波形２０１の場合と全波整流波形２０２の場合とで、明るさを略同一にする。 However, when the full-wave rectified waveform 202 having a larger effective value than the full-wave rectified waveform 201 is applied to the LED string 11, the current waveform 205 has a larger duty than the current waveform 204, while the peak value is the current waveform. It is lower than 204. That is, when the full-wave rectified waveform 202 is applied to the LED string 11, the LED light-emitting device 1 has a longer lighting period for the plurality of LEDs 110 included in the LED string 11 as compared to the normal state, while The brightness when the plurality of included LEDs 110 are turned on is reduced. As a result, the LED light emitting device 1 makes the brightness substantially the same when the voltage waveform applied to the LED array 11 is the full-wave rectified waveform 201 and the full-wave rectified waveform 202.
　全波整流波形２０１より実効値の大きい全波整流波形２０２がＬＥＤ列１１に印加されると、平滑回路１２の第１基準電圧出力端子の電圧である第１基準電圧は、全波整流波形２０１がＬＥＤ列１１に印加されるときよりも上昇する。第１基準電圧が上昇すると、０．６Ｖで維持される第１トランジスタ３５のベースの電圧である第２基準電圧との電位差が大きくなり、第１入力抵抗３２を流れる電流が大きくなる。第１入力抵抗３２を流れる電流が大きくなることに応じて、第１出力抵抗３３に流れる電流が大きくなるので、第１出力抵抗３３における電圧降下δは、全波整流波形２０１がＬＥＤ列１１に印加されるときよりも大きい。第１検出抵抗３４に流れる第１電流Ｉlimは、０．６Ｖである第２基準電圧Ｖbe及び第１検出抵抗３４の抵抗値Ｒsenから When the full-wave rectified waveform 202 having a larger effective value than the full-wave rectified waveform 201 is applied to the LED string 11, the first reference voltage, which is the voltage at the first reference voltage output terminal of the smoothing circuit 12, becomes the full-wave rectified waveform 201. Is higher than when it is applied to the LED string 11. When the first reference voltage rises, the potential difference from the second reference voltage, which is the base voltage of the first transistor 35 maintained at 0.6V, increases, and the current flowing through the first input resistor 32 increases. Since the current flowing through the first output resistor 33 increases as the current flowing through the first input resistor 32 increases, the voltage drop δ in the first output resistor 33 is caused by the full-wave rectified waveform 201 in the LED string 11. Greater than when applied. The first current I lim flowing through the first detection resistor 34 is calculated from the second reference voltage V be , which is 0.6 V, and the resistance value R sen of the first detection resistor 34.
Figure JPOXMLDOC01-appb-M000001
Figure JPOXMLDOC01-appb-M000001
　で示される。第１電流Ｉlimは、第１出力抵抗３３における電圧降下δが大きくなることに応じて小さくなる。 Indicated by. The first current I lim decreases as the voltage drop δ in the first output resistor 33 increases.
　ＬＥＤ列１１に全波整流波形２０１より実効値の小さい全波整流波形２０３が印加されるとき、電流波形２０６は、電流波形２０４に比べ、デューティが小さくなる一方でピーク値が上昇する。ＬＥＤ列１１に印加される電圧波形が全波整流波形２０３である場合、通常状態に比べ、ＬＥＤ列１１に含まれるＬＥＤ１１０の点灯期間が短くなる一方で、ＬＥＤ列１１に含まれるＬＥＤ１１０の点灯時における輝度が電流波形２０４に比べて増加する。この結果、ＬＥＤ発光装置１は、ＬＥＤ列１１に含まれる複数のＬＥＤ１１０に印加する全波整流波形２０１の場合と全波整流波形２０３の場合とで、ＬＥＤ発光装置１の明るさを略同一にする。 When the full-wave rectified waveform 203 having a smaller effective value than the full-wave rectified waveform 201 is applied to the LED string 11, the current waveform 206 has a smaller duty than the current waveform 204 but the peak value increases. When the voltage waveform applied to the LED string 11 is the full-wave rectified waveform 203, the lighting period of the LED 110 included in the LED string 11 becomes shorter than that in the normal state, while the LED 110 included in the LED string 11 lights up. The brightness at is increased compared to the current waveform 204. As a result, in the LED light emitting device 1, the brightness of the LED light emitting device 1 is substantially the same between the case of the full-wave rectified waveform 201 applied to the plurality of LEDs 110 included in the LED array 11 and the case of the full-wave rectified waveform 203. To do.
　全波整流波形２０１より実効値の小さい全波整流波形２０３がＬＥＤ列１１に印加されると、第１基準電圧は、全波整流波形２０１がＬＥＤ列１１に印加されるときよりも下降する。第１基準電圧が下降すると、０．６Ｖで維持される第１トランジスタ３５のベースの電圧である第２基準電圧との電位差が小さくなり、第１入力抵抗３２を流れる電流が小さくなる。第１入力抵抗３２を流れる電流が小さくなることに応じて、第１出力抵抗３３に流れる電流が小さくなるので、第１出力抵抗３３における電圧降下δは、全波整流波形２０１がＬＥＤ列１１に印加されるときよりも小さい。式（１）に示すように、第１電流Ｉlimは、第１出力抵抗３３における電圧降下δが小さくなることに応じて大きくなる。 When the full-wave rectified waveform 203 having an effective value smaller than that of the full-wave rectified waveform 201 is applied to the LED string 11, the first reference voltage is lower than when the full-wave rectified waveform 201 is applied to the LED string 11. When the first reference voltage drops, the potential difference from the second reference voltage, which is the base voltage of the first transistor 35 maintained at 0.6V, becomes smaller, and the current flowing through the first input resistor 32 becomes smaller. As the current flowing through the first input resistor 32 becomes smaller, the current flowing through the first output resistor 33 becomes smaller, so that the voltage drop δ at the first output resistor 33 is due to the full-wave rectified waveform 201 in the LED string 11. Smaller than when applied. As shown in Expression (1), the first current I lim increases as the voltage drop δ in the first output resistor 33 decreases.
　ＬＥＤ発光装置１は、平滑回路１２により得られるＬＥＤ列１１の第２端子の平均的な電圧と、第１検出抵抗３４の一端の電圧により、第１ＦＥＴ３０に負帰還（ネガティブフィードバック）を掛ける。負帰還の基準となる第２基準電圧は、グランドから第１トランジスタ３５のベース－エミッタ間電圧（約０．６Ｖ）だけ高い電圧であり、負帰還が正常に掛かるとき、第２基準電圧は、約０．６Ｖである。商用交流電源１００の実効値が増加して、整流回路１０１からＬＥＤ列１１に電流が流れ込む期間が長くなるとき、第１ＦＥＴ３０に流れる電流の上限値が減少する。反対に、商用交流電源１００の実効値が減少して、整流回路１０１からＬＥＤ列１１に電流が流れ込む期間が短くなると、第１ＦＥＴ３０に流れる電流の上限値が増加する。 The LED light emitting device 1 applies a negative feedback to the first FET 30 by the average voltage of the second terminal of the LED array 11 obtained by the smoothing circuit 12 and the voltage at one end of the first detection resistor 34. The second reference voltage, which is the reference of the negative feedback, is a voltage higher than the ground by the base-emitter voltage (about 0.6 V) of the first transistor 35, and when the negative feedback is normally applied, the second reference voltage is It is about 0.6V. When the effective value of the commercial AC power supply 100 increases and the period in which the current flows from the rectifier circuit 101 to the LED string 11 becomes long, the upper limit value of the current flowing through the first FET 30 decreases. On the contrary, when the effective value of the commercial AC power supply 100 decreases and the period in which the current flows from the rectifier circuit 101 to the LED array 11 becomes short, the upper limit value of the current flowing through the first FET 30 increases.
　なお、第１入力抵抗３２及び第１出力抵抗３３を介さず、第１検出抵抗３４の一端を第１トランジスタ３５のベースに直接接続する第１ＦＥＴ３０、第１プルアップ抵抗３１、第１検出抵抗３４及び第１トランジスタ３５からなる回路は、良く知られた電流制限回路である。ＬＥＤ発光装置１では、この良く知られた電流制限回路に第１入力抵抗３２及び第１出力抵抗３３を加えることにより、第１ＦＥＴ３０に第１検出抵抗３４で検出した電流の情報に加え、商用交流電源１００の実効値に係る情報をフィードバックする。すなわち、第１電流制限回路１３は、商用交流電源１００の実効値が反映されたＬＥＤ列１１の電流制限回路となる。第１入力抵抗３２及び第１出力抵抗３３は、いわゆる電圧加算回路を構成している。 The first FET 30, the first pull-up resistor 31, and the first detection resistor 34, which directly connect one end of the first detection resistor 34 to the base of the first transistor 35, not via the first input resistor 32 and the first output resistor 33. The circuit including the first transistor 35 and the first transistor 35 is a well-known current limiting circuit. In the LED light emitting device 1, by adding the first input resistor 32 and the first output resistor 33 to this well-known current limiting circuit, in addition to the information of the current detected by the first detection resistor 34 in the first FET 30, the commercial AC Information about the effective value of the power supply 100 is fed back. That is, the first current limiting circuit 13 becomes a current limiting circuit of the LED array 11 in which the effective value of the commercial AC power supply 100 is reflected. The first input resistor 32 and the first output resistor 33 form a so-called voltage adding circuit.
　以上のように、ＬＥＤ発光装置１は、第１平滑抵抗２１、第２平滑抵抗２２、平滑コンデンサ２３、第１入力抵抗３２及び第１出力抵抗３３等の受動部品を追加し、これまで知られてきた電流制限回路に、商用交流電源１００の実効値の変化を打ち消す機能を与えた。つまり、ＬＥＤ発光装置１は、受動部品だけで構成した結果、新たな直流電源を準備しなくても実効値の変化と反対方向にＬＥＤ電流を調整でき、実効値に連動する明るさの変動を抑圧することができるようになった。 As described above, the LED light emitting device 1 has the passive components such as the first smoothing resistor 21, the second smoothing resistor 22, the smoothing capacitor 23, the first input resistor 32, and the first output resistor 33, which have been known so far. The current limiting circuit has a function of canceling a change in the effective value of the commercial AC power supply 100. In other words, as a result of the LED light-emitting device 1 being composed of only passive components, the LED current can be adjusted in the opposite direction to the change in the effective value without preparing a new DC power source, and fluctuations in brightness linked to the effective value can be prevented. I can now suppress it.
　（第２実施形態）
　ＡＣ駆動型のＬＥＤ発光装置では、ＬＥＤ列の中間点にバイパス回路を設け、点灯期間を広げ、明るさの向上と、フリッカ及びＴＨＤの低減とを図ることがある。そこで、図４及び図５を参照して、第２実施形態として、バイパス回路として機能する第２電流制限回路１４を備えたＬＥＤ発光装置２を説明する。図４は、ＬＥＤ発光装置２の回路図である。なお、図２のＬＥＤ発光装置１と同じ部材については同じ番号を付し、説明は省略する。図５は、ＬＥＤ発光装置２に流れる電流の説明図であり、（ａ）は、一周期分の全波整流波形、（ｂ）は、ＬＥＤ列１１に流れる電流を示している。図５（ａ）において、縦軸Ｖは、電圧、横軸ｔは、時間である。図５（ｂ）において、縦軸Ｉは、電流、横軸ｔは、時間である。なお図５（ａ）、５（ｂ）の横軸ｔは一致している。また、図５により、ＬＥＤ発光装置２の動作を説明するとき、特別な指示をすることなく図４を参照する。 (Second embodiment)
In an AC drive type LED light emitting device, a bypass circuit may be provided at an intermediate point of an LED array to extend a lighting period to improve brightness and reduce flicker and THD. Therefore, with reference to FIGS. 4 and 5, as a second embodiment, an LED light emitting device 2 including a second current limiting circuit 14 that functions as a bypass circuit will be described. FIG. 4 is a circuit diagram of the LED light emitting device 2. The same members as those of the LED light emitting device 1 of FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. 5A and 5B are explanatory diagrams of a current flowing through the LED light emitting device 2, where FIG. 5A shows a full-wave rectified waveform for one cycle, and FIG. 5B shows a current flowing through the LED string 11. In FIG. 5A, the vertical axis V is voltage and the horizontal axis t is time. In FIG. 5B, the vertical axis I is the current and the horizontal axis t is the time. The horizontal axes t in FIGS. 5A and 5B are in agreement. Further, when explaining the operation of the LED light emitting device 2 with reference to FIG. 5, FIG. 4 will be referred to without giving a special instruction.
　図４に示すＬＥＤ発光装置２と図１及びに示すＬＥＤ発光装置１との差異として、ＬＥＤ発光装置２において、ＬＥＤ列１１が第１ＬＥＤ列１１ａと第２ＬＥＤ列１１ｂとを含むことが挙げられる。また、ＬＥＤ発光装置２とＬＥＤ発光装置１との差異として、第１ＬＥＤ列１１ａと第２ＬＥＤ列１１ｂの接続点とグランドとの間に第２電流制限回路１４を設けたことが挙げられる。第２電流制限回路１４以外のＬＥＤ発光装置２の構成要素の構成及び機能は、同一符号が付されたＬＥＤ発光装置１の構成要素の構成及び機能と同一なので、ここでは詳細な説明は省略する。 The difference between the LED light emitting device 2 shown in FIG. 4 and the LED light emitting device 1 shown in FIGS. 1 and 2 is that in the LED light emitting device 2, the LED row 11 includes a first LED row 11a and a second LED row 11b. The difference between the LED light emitting device 2 and the LED light emitting device 1 is that the second current limiting circuit 14 is provided between the connection point of the first LED row 11a and the second LED row 11b and the ground. The configurations and functions of the components of the LED light emitting device 2 other than the second current limiting circuit 14 are the same as the configurations and functions of the components of the LED light emitting device 1 designated by the same reference numerals, and thus detailed description thereof will be omitted here. ..
　第１ＬＥＤ列１１ａ及び第２ＬＥＤ列１１ｂに含まれるＬＥＤ１１０の数は、同一でもよく相違してもよい。第１ＬＥＤ列１１ａの最終段のＬＥＤ１１０は、ＬＥＤ列１１に含まれる複数のＬＥＤの最終段のＬＥＤ以外のＬＥＤであり、第２接続ＬＥＤとも称される。第２接続ＬＥＤのカソード及び第２ＬＥＤ列１１ｂの初段のＬＥＤのアノードは、第３端子を構成し、第２電流制限回路１４の第２電流入力端子に接続する。 The number of LEDs 110 included in the first LED row 11a and the second LED row 11b may be the same or different. The final-stage LED 110 of the first LED row 11a is an LED other than the final-stage LED of the plurality of LEDs included in the LED row 11, and is also referred to as a second connection LED. The cathode of the second connection LED and the anode of the first-stage LED of the second LED array 11b form a third terminal and are connected to the second current input terminal of the second current limiting circuit 14.
　図４に示すように、第２電流制限回路１４は、第２ＦＥＴ４０と、第２プルアップ抵抗４１と、第２入力抵抗４２と、第２出力抵抗４３と、第２検出抵抗４４と、第２トランジスタ４５と、第２チャタリング防止コンデンサ４６とを有する。前述のように、第２電流制限回路１４の第２電流入力端子は、ＬＥＤ列１１の第３端子と接続する。この第２電流入力端子は、第２ＦＥＴ４０のドレインと第２プルアップ抵抗４１の上端とを含む。第２入力抵抗４２の右端は、第１基準電圧入力端子を構成し、平滑回路１２の第１電圧基準電圧出力端子及び第１電流制限回路１３の第１基準電圧入力端子と接続している。第２検出抵抗４４の右端は、第１電流入力端子を構成し、第１電流制限回路１３の第１電流出力端子と接続している。第２検出抵抗４４の左端は、第２電流出力端子を構成し、整流回路１０１の電流が戻る端子と接続している。 ＬＥＤ発光装置２では、第３端子から第２電流入力端子に流れ込む電流を第２電流とする。第２電流は、第１基準電圧及び第１電流により制限される。 As shown in FIG. 4, the second current limiting circuit 14 includes a second FET 40, a second pull-up resistor 41, a second input resistor 42, a second output resistor 43, a second detecting resistor 44, and a second detecting resistor 44. It has a transistor 45 and a second chattering prevention capacitor 46. As described above, the second current input terminal of the second current limiting circuit 14 is connected to the third terminal of the LED string 11. The second current input terminal includes the drain of the second FET 40 and the upper end of the second pull-up resistor 41. The right end of the second input resistor 42 constitutes a first reference voltage input terminal and is connected to the first voltage reference voltage output terminal of the smoothing circuit 12 and the first reference voltage input terminal of the first current limiting circuit 13. The right end of the second detection resistor 44 constitutes a first current input terminal and is connected to the first current output terminal of the first current limiting circuit 13. The left end of the second detection resistor 44 constitutes a second current output terminal, and is connected to the terminal to which the current of the rectifier circuit 101 returns. In the LED light emitting device 2, the current flowing from the third terminal to the second current input terminal is the second current. The second current is limited by the first reference voltage and the first current.
　符号４０～４６で示した部品（第２ＦＥＴ４０、第２チャタリング防止コンデンサ４６等）のそれぞれは、符号３０～３６で示した部品（第１ＦＥＴ３０、第１プルアップ抵抗３１、第１チャタリング防止コンデンサ３６等）と対応関係にある。第２ＦＥＴ４０は、第１ＦＥＴ３０と同様に商用交流電源１００の実効値変動を打ち消すようにして、第１ＬＥＤ列１１ａに流れる電流値の上限値を制限する。なお、第２電流制限回路１４では、第２ＬＥＤ列１１ｂに電流が流れ始めると、第２検出抵抗４４の一端（第１電流入力端子）の電圧が上昇し、第２ＦＥＴ４０がカットオフする。 The components (second FET 40, second chattering prevention capacitor 46, etc.) denoted by reference numerals 40 to 46 are respectively the components (first FET 30, first pull-up resistor 31, first chattering prevention capacitor 36, etc.) denoted by reference numerals 30 to 36. ) And the correspondence. The second FET 40 limits the upper limit value of the current value flowing through the first LED string 11a by canceling the variation in the effective value of the commercial AC power supply 100, similarly to the first FET 30. In the second current limiting circuit 14, when a current starts flowing through the second LED string 11b, the voltage at one end (first current input terminal) of the second detection resistor 44 rises and the second FET 40 is cut off.
　図５（ａ）は、第１ＬＥＤ列１１ａの閾値Ｖｔ１が示されることが図３（ａ）と相違する。図５（ａ）における全波整流波形２０１、２０２、２０３は、図３（ａ）における全波整流波形２０１、２０２、２０３と同一である。図５（ｂ）において電流波形２１４、２１５、２１６は、それぞれ図５（ａ）で示した全波整流波形２０１、２０２、２０３に対応してＬＥＤ発光装置２に流れる電流を示す。 5A is different from FIG. 3A in that the threshold value Vt1 of the first LED row 11a is shown. The full-wave rectified waveforms 201, 202, and 203 in FIG. 5A are the same as the full-wave rectified waveforms 201, 202, and 203 in FIG. In FIG. 5B, current waveforms 214, 215, and 216 show currents flowing through the LED light emitting device 2 corresponding to the full-wave rectified waveforms 201, 202, and 203 shown in FIG. 5A, respectively.
　図５（ｂ）に示すように、通常状態の電流波形２１４は、全波整流波形２０１の電圧が閾値Ｖｔ１より低い期間では０（Ａ）である。全波整流波形２０１の電圧が上昇し、閾値Ｖｔ１まで上昇すると、第１ＬＥＤ列１１ａに第２電流が流れる始め、電流波形２１４は急激に立ち上がる。全波整流波形２０１の電圧が閾値Ｖｔ１以上であり、且つ、閾値Ｖｔ未満である期間では、第２電流制限回路１４が電流制限回路として機能し、電流波形２１４が平坦になる。全波整流波形２０１の電圧が閾値Ｖｔまで上昇すると、電流波形２１４は急激に立ち上がる。全波整流波形２０１の電圧が閾値Ｖｔ以上となる期間では、第１ＬＥＤ列１１ａ及び第２ＬＥＤ列１１ｂに第１電流が流れ、第２電流制限回路１４の第２ＦＥＴ４０がカットオフして、第２ＦＥＴ４０を介する電流経路が遮断される。全波整流波形２０１の電圧が閾値Ｖｔ以上となる期間では、第２ＦＥＴ４０の電流制限により電流波形２１４が、より高い値で平坦になる。全波整流波形２０１の電圧が下降する位相では、逆の過程を辿る。 As shown in FIG. 5B, the current waveform 214 in the normal state is 0 (A) during the period when the voltage of the full-wave rectified waveform 201 is lower than the threshold value Vt1. When the voltage of the full-wave rectified waveform 201 rises to the threshold value Vt1, the second current starts flowing through the first LED string 11a, and the current waveform 214 rises sharply. In a period in which the voltage of the full-wave rectified waveform 201 is equal to or higher than the threshold Vt1 and lower than the threshold Vt, the second current limiting circuit 14 functions as a current limiting circuit and the current waveform 214 becomes flat. When the voltage of the full-wave rectified waveform 201 rises to the threshold value Vt, the current waveform 214 suddenly rises. During the period when the voltage of the full-wave rectified waveform 201 is equal to or higher than the threshold value Vt, the first current flows through the first LED row 11a and the second LED row 11b, the second FET 40 of the second current limiting circuit 14 is cut off, and the second FET 40 is turned off. The current path through it is cut off. During the period when the voltage of the full-wave rectified waveform 201 is equal to or higher than the threshold value Vt, the current waveform 214 becomes flat at a higher value due to the current limitation of the second FET 40. In the phase where the voltage of the full-wave rectified waveform 201 drops, the reverse process is followed.
　同様に、実効値が異なる全波整流波形２０２、２０３に対しても、ＬＥＤ列１１の電流波形２１５、２１６は、段状の矩形波となる。 Similarly, the current waveforms 215 and 216 of the LED array 11 are stepwise rectangular waves even for the full-wave rectified waveforms 202 and 203 having different effective values.
　しかしながら、全波整流波形２０１より実効値の大きい全波整流波形２０２がＬＥＤ列１１に印加される場合、電流波形２１５は、ＬＥＤ１１０が点灯する期間が広がる一方で、それぞれの期間におけるピーク値が低下する。すなわち、ＬＥＤ列１１に印加される電圧波形が全波整流波形２０２の場合、ＬＥＤ発光装置２は、通常状態に比べ、ＬＥＤ列１１の点灯期間が長くなる一方で、ＬＥＤ列１１の点灯時における輝度を低下している。この結果、ＬＥＤ発光装置２は、ＬＥＤ列１１に印加される電圧波形が全波整流波形２０１の場合と全波整流波形２０２の場合とで、ＬＥＤ発光装置２の明るさを略同一にする。 However, when the full-wave rectified waveform 202 having an effective value larger than that of the full-wave rectified waveform 201 is applied to the LED array 11, the current waveform 215 has a longer peak period during which the LED 110 is lit while the current waveform 215 has a lower peak value. To do. That is, when the voltage waveform applied to the LED string 11 is the full-wave rectified waveform 202, the LED light-emitting device 2 has a longer lighting period of the LED string 11 than in the normal state, but at the time of lighting the LED string 11. The brightness is reduced. As a result, the LED light emitting device 2 makes the brightness of the LED light emitting device 2 substantially the same when the voltage waveform applied to the LED string 11 is the full-wave rectified waveform 201 and the case where the voltage waveform is the full-wave rectified waveform 202.
　全波整流波形２０１より実効値の小さい全波整流波形２０３をＬＥＤ列１１に印加する場合、ＬＥＤ発光装置２は、通常状態に比べ、ＬＥＤ列１１の点灯期間が短くなる一方で、ＬＥＤ列１１の点灯時における輝度が増加する。ＬＥＤ発光装置２は、ＬＥＤ列１１に印加する電圧波形が全波整流波形２０１の場合と全波整流波形２０３の場合とで、明るさを略同一にする。 When the full-wave rectified waveform 203 having an effective value smaller than that of the full-wave rectified waveform 201 is applied to the LED row 11, the LED light-emitting device 2 has a shorter lighting period of the LED row 11 than the normal state, while the LED row 11 has a shorter lighting period. The brightness at the time of lighting increases. The LED light emitting device 2 makes the brightness substantially the same when the voltage waveform applied to the LED array 11 is the full-wave rectified waveform 201 and the full-wave rectified waveform 203.
　ＬＥＤ発光装置２では、第１基準電圧を出力する第１基準電圧端子は、第１入力抵抗３２及び第２入力抵抗４２のそれぞれに直接接続される。また、ＬＥＤ発光装置２では、第１検出抵抗３４及び第２検出抵抗４４は、直列接続される。第１ＦＥＴ３０に第１電流が流れるとき、平滑回路１２及び第１電流制限回路１３の双方は、第２検出抵抗４４の一端の電圧によりオフセットされる。平滑回路１２及び第１電流制限回路１３が同一電圧でオフセットされるので、第１検出抵抗３４に流れる第１電流Ｉlimは、第２基準電圧Ｖbe、第１出力抵抗３３における電圧降下δ及び第１検出抵抗３４の抵抗値Ｒsenとの間で式（１）の関係を充足する。また、第２ＦＥＴ４０に第２電流が流れるとき、第１検出抵抗３４に電流が流れないので、第２検出抵抗４４に流れる第２電流Ｉlimは、第２基準電圧Ｖbe、第２出力抵抗４３における電圧降下δ及び第２検出抵抗４４の抵抗値Ｒsenとの間で式（１）の関係を充足する。 In the LED light emitting device 2, the first reference voltage terminal that outputs the first reference voltage is directly connected to each of the first input resistor 32 and the second input resistor 42. Further, in the LED light emitting device 2, the first detection resistor 34 and the second detection resistor 44 are connected in series. When the first current flows through the first FET 30, both the smoothing circuit 12 and the first current limiting circuit 13 are offset by the voltage at one end of the second detection resistor 44. Since the smoothing circuit 12 and the first current limiting circuit 13 are offset by the same voltage, the first current I lim flowing through the first detection resistor 34 is equal to the second reference voltage V be , the voltage drop δ at the first output resistor 33, and The relationship of Expression (1) is satisfied with the resistance value R sen of the first detection resistor 34. When the second current flows through the second FET 40, no current flows through the first detection resistor 34, so the second current I lim flowing through the second detection resistor 44 is the second reference voltage V be and the second output resistor 43. The relationship of the equation (1) is satisfied between the voltage drop δ at and the resistance value R sen of the second detection resistor 44.
　ＬＥＤ発光装置２は、第１基準電圧端子は、第１入力抵抗３２及び第２入力抵抗４２に直接接続され、且つ、第１検出抵抗３４及び第２検出抵抗４４が直列接続されることで、第１電流及び第２電流が式（１）により規定できる。ＬＥＤ発光装置２は、第１電流及び第２電流が式（１）により規定することができるので、第１出力抵抗３３、第１検出抵抗３４、第２出力抵抗４３及び第２検出抵抗４４の抵抗値を所望の値に設定することで、第１電流及び第２電流を容易に規定できる。 In the LED light emitting device 2, the first reference voltage terminal is directly connected to the first input resistor 32 and the second input resistor 42, and the first detection resistor 34 and the second detection resistor 44 are connected in series, The first current and the second current can be defined by the equation (1). In the LED light emitting device 2, since the first current and the second current can be defined by the equation (1), the first output resistance 33, the first detection resistance 34, the second output resistance 43, and the second detection resistance 44 are The first current and the second current can be easily defined by setting the resistance value to a desired value.
（第３実施形態）
　ＡＣ駆動型のＬＥＤ発光装置では、コンデンサを追加して、フリッカを改善することがある。そこで、図６及び図７により、第３実施形態として、フリッカ対策を施したＬＥＤ発光装置３を説明する。図６は、ＬＥＤ発光装置３の回路図である。なお、図１、図２、図４を参照して説明されたＬＥＤ発光装置１及び２と同じ部材については同じ番号を付し、説明は省略する。図７は、ＬＥＤ発光装置３に流れる電流の説明図であり、（ａ）は、一周期分の全波整流波形、（ｂ）は、整流回路１０１が出力する電流を示している。図７（ａ）は、図５（ａ）と同じものであり、縦軸Ｖは、電圧、横軸ｔは、時間である。図７（ｂ）において、縦軸Ｉは、電流、横軸ｔは、時間である。なお図７（ａ）、（ｂ）の横軸ｔは一致している。また、図７によりＬＥＤ発光装置３の動作を説明するとき、特別な指示をすることなく図６を参照する。 (Third Embodiment)
In an AC-driven LED light emitting device, a capacitor may be added to improve flicker. Therefore, an LED light emitting device 3 provided with a countermeasure against flicker will be described as a third embodiment with reference to FIGS. 6 and 7. FIG. 6 is a circuit diagram of the LED light emitting device 3. The same members as those of the LED light emitting devices 1 and 2 described with reference to FIGS. 1, 2, and 4 are denoted by the same reference numerals, and the description thereof will be omitted. FIG. 7 is an explanatory diagram of a current flowing through the LED light emitting device 3, where (a) shows a full-wave rectified waveform for one cycle, and (b) shows a current output by the rectifier circuit 101. FIG. 7A is the same as FIG. 5A, in which the vertical axis V is voltage and the horizontal axis t is time. In FIG. 7B, the vertical axis I is the current and the horizontal axis t is the time. The horizontal axes t in FIGS. 7A and 7B coincide with each other. Further, when explaining the operation of the LED light emitting device 3 with reference to FIG. 7, reference is made to FIG. 6 without giving a special instruction.
　図６に示すＬＥＤ発光装置３と図４に示すＬＥＤ発光装置２との差異として、ＬＥＤ発光装置２において、第１ＬＥＤ列１１ａ及び第２ＬＥＤ列１１ｂにそれぞれに並列接続された第１並列コンデンサ４７及び第２並列コンデンサ３７を有することが挙げられる。また、ＬＥＤ発光装置３とＬＥＤ発光装置２との差異として、第１ＬＥＤ列１１ａ及び第２ＬＥＤ列１１ｂの初段のＬＥＤ１１０のアノードに第１逆流防止ダイオード３８及び第２逆流防止ダイオード４８を有することが挙げられる。図７（ｂ）に示す電流波形２２４、２２５、２２６は、図７（ａ）に示す全波整流波形２０１、２０２、２０３に対応して整流回路１０１が出力する電流である。 The difference between the LED light emitting device 3 shown in FIG. 6 and the LED light emitting device 2 shown in FIG. 4 is that in the LED light emitting device 2, a first parallel capacitor 47 connected in parallel to the first LED row 11a and the second LED row 11b, Having the second parallel capacitor 37 may be mentioned. Further, the difference between the LED light emitting device 3 and the LED light emitting device 2 is that the first backflow prevention diode 38 and the second backflow prevention diode 48 are provided at the anodes of the LEDs 110 in the first stage of the first LED row 11a and the second LED row 11b. Be done. The current waveforms 224, 225, and 226 shown in FIG. 7B are currents output by the rectifier circuit 101 corresponding to the full-wave rectified waveforms 201, 202, and 203 shown in FIG. 7A.
　図７（ａ）で示す全波整流波形２０１～２０３が閾値電圧Ｖｔ１に達しない期間、整流回路１０１から第１ＬＥＤ列１１ａに電流が流れ込まない。このとき、一例では電解コンデンサである第１並列コンデンサ４７が放電し、第１並列コンデンサ４７の放電により第１ＬＥＤ列１１ａが点灯する。同様に、図７（ａ）で示す全波整流波形２０１等が閾値電圧Ｖｔに達しない期間、整流回路１０１から第１ＬＥＤ列１１ａを経て第２ＬＥＤ列１１ｂに電流が流れ込まない。このとき、第２並列コンデンサ３７が放電し、第２並列コンデンサ３７の放電により第２ＬＥＤ列１１ｂが点灯する。すなわち、ＬＥＤ発光装置３において追加された第１並列コンデンサ４７及び第２並列コンデンサ３７は、ＬＥＤ発光装置２においてＬＥＤ列１１が消灯する不点灯期間を消滅させ、フリッカを低減する。 During the period in which the full-wave rectified waveforms 201 to 203 shown in FIG. 7A do not reach the threshold voltage Vt1, no current flows from the rectifier circuit 101 to the first LED string 11a. At this time, the first parallel capacitor 47, which is an electrolytic capacitor in one example, is discharged, and the discharge of the first parallel capacitor 47 turns on the first LED row 11a. Similarly, during the period in which the full-wave rectified waveform 201 or the like shown in FIG. 7A does not reach the threshold voltage Vt, no current flows from the rectifier circuit 101 to the second LED string 11b through the first LED string 11a. At this time, the second parallel capacitor 37 is discharged, and the discharge of the second parallel capacitor 37 turns on the second LED column 11b. That is, the first parallel capacitor 47 and the second parallel capacitor 37 added in the LED light emitting device 3 eliminate the non-lighting period in which the LED row 11 is turned off in the LED light emitting device 2 to reduce flicker.
　第１逆流防止ダイオード４８は、第１並列コンデンサ４７に受電された電荷が整流回路１０１に逆流することを防止し、第２逆流防止ダイオード３８は、第２並列コンデンサ３７に受電された電荷が第２電流制限回路１４に逆流することを防止する。 The first backflow prevention diode 48 prevents the electric charge received by the first parallel capacitor 47 from flowing back to the rectifier circuit 101, and the second backflow prevention diode 38 detects the electric charge received by the second parallel capacitor 37 by the first charge. The backflow to the two-current limiting circuit 14 is prevented.
　（第４実施形態）
　図８及び図９により、第４実施形態として、第３実施形態であるＬＥＤ発光装置３にＴＨＤ対策を施したＬＥＤ発光装置４を説明する。図８は、ＬＥＤ発光装置４の回路図である。なお、図１、図２、図４、図６を参照して説明されたＬＥＤ発光装置１～３と同じ部材については同じ番号を付し、説明は省略する。図９は、ＬＥＤ発光装置４に流れる電流の説明図であり、（ａ）は、一周期分の全波整流波形、（ｂ）は、整流回路１０１が出力する電流を示している。図９（ａ）は、図５（ａ）、図７（ａ）と同じものであり、縦軸Ｖは、電圧、横軸ｔは、時間である。図９（ｂ）において、縦軸Ｉは、電流、横軸ｔは、時間である。なお図９（ａ）、（ｂ）の横軸ｔは一致している。また、図９によりＬＥＤ発光装置４の動作を説明するとき、特別な指示をすることなく図８を参照する。 (Fourth Embodiment)
8 and 9, an LED light emitting device 4 in which the LED light emitting device 3 of the third embodiment is provided with THD countermeasures will be described as a fourth embodiment. FIG. 8 is a circuit diagram of the LED light emitting device 4. The same members as those of the LED light emitting devices 1 to 3 described with reference to FIGS. 1, 2, 4, and 6 are designated by the same reference numerals, and the description thereof will be omitted. 9A and 9B are explanatory diagrams of a current flowing through the LED light emitting device 4, where FIG. 9A illustrates a full-wave rectified waveform for one cycle, and FIG. 9B illustrates a current output by the rectifier circuit 101. 9A is the same as FIG. 5A and FIG. 7A, the vertical axis V is voltage, and the horizontal axis t is time. In FIG. 9B, the vertical axis I is the current and the horizontal axis t is the time. The horizontal axes t in FIGS. 9A and 9B match each other. Further, when explaining the operation of the LED light emitting device 4 with reference to FIG. 9, FIG. 8 will be referred to without giving a special instruction.
　図８に示すＬＥＤ発光装置４と図６に示すＬＥＤ発光装置３との差異として、ＬＥＤ発光装置３において、第１トランジスタ３５、第２トランジスタ４５のコレクタ－エミッタ間にそれぞれに並列接続された第１並列抵抗３９及び第２並列抵抗４９を有することが挙げられる。図９（ｂ）に示す電流波形２２１、２２２、２２３は、図９（ａ）に示す全波整流波形２０１、２０２、２０３に対応して整流回路１０１が出力する電流である。 The difference between the LED light emitting device 4 shown in FIG. 8 and the LED light emitting device 3 shown in FIG. 6 is that in the LED light emitting device 3, a first transistor 35 and a second transistor 45, which are connected in parallel between the collector and the emitter, respectively. It can be mentioned that the first parallel resistance 39 and the second parallel resistance 49 are included. Current waveforms 221, 222, 223 shown in FIG. 9B are currents output by the rectifier circuit 101 corresponding to the full-wave rectified waveforms 201, 202, 203 shown in FIG. 9A.
　第１並列抵抗３９及び第２並列抵抗４９は、図７（ｂ）に示す電流波形２２４、２２５、２２６と比較して、図９（ｂ）に示すように電流波形２３４、２３５、２３６の肩の部分を丸くする。すなわち、ＬＥＤ発光装置４は、第１並列抵抗３９及び第２並列抵抗４９が追加されたことにより、ＬＥＤ発光装置３よりもＴＨＤが改善される。 The first parallel resistor 39 and the second parallel resistor 49 compare the current waveforms 224, 225, and 226 shown in FIG. 7B with shoulders of the current waveforms 234, 235, and 236 as shown in FIG. 9B. Round the part of. That is, in the LED light emitting device 4, the THD is improved as compared with the LED light emitting device 3 by adding the first parallel resistor 39 and the second parallel resistor 49.
　（第５実施形態）
　図１０は、第５実施形態に係るＬＥＤ発光装置５の回路図である。第５実施形態に係るＬＥＤ発光装置５は、ＬＥＤ列１１が第３ＬＥＤ列１１ｃを更に含むこと、及び第３電流制限回路１５、第３並列コンデンサ５７及び第３逆流防止ダイオード５８を有することが第３実施形態に係るＬＥＤ発光装置３と相違する。第３電流制限回路１５、第３並列コンデンサ５７及び第３逆流防止ダイオード５８以外のＬＥＤ発光装置５の構成要素の構成及び機能は、同一符号が付されたＬＥＤ発光装置３の構成要素の構成及び機能と同一なので、ここでは詳細な説明は省略する。 (Fifth Embodiment)
FIG. 10 is a circuit diagram of the LED light emitting device 5 according to the fifth embodiment. In the LED light emitting device 5 according to the fifth embodiment, the LED string 11 further includes the third LED string 11c, and has the third current limiting circuit 15, the third parallel capacitor 57, and the third backflow prevention diode 58. This is different from the LED light emitting device 3 according to the third embodiment. The configurations and functions of the components of the LED light emitting device 5 other than the third current limiting circuit 15, the third parallel capacitor 57, and the third backflow prevention diode 58 are the same as those of the components of the LED light emitting device 3 to which the same reference numerals are assigned. Since the function is the same, detailed description is omitted here.
　第１ＬＥＤ列１１ａ、第２ＬＥＤ列１１ｂ及び第３ＬＥＤ列１１ｃに含まれるＬＥＤ１１０の数は、同一でもよく相違してもよい。第１ＬＥＤ列１１ａの最終段のＬＥＤ１１０は、ＬＥＤ列１１に含まれる複数のＬＥＤの最終段のＬＥＤ以外のＬＥＤであり、第３接続ＬＥＤとも称される。第３接続ＬＥＤのカソードは、第２ＬＥＤ列１１ｂの初段のＬＥＤのアノード及び第３電流制限回路１５に接続する第４端子である。第２ＬＥＤ列１１ｂの最終段のＬＥＤ１１０は、第２接続ＬＥＤとも称される。第２接続ＬＥＤのカソードは、第３ＬＥＤ列１１ｃの初段のＬＥＤのアノード及び第２電流制限回路１４に接続する第３端子である。 The number of LEDs 110 included in the first LED row 11a, the second LED row 11b, and the third LED row 11c may be the same or different. The final-stage LED 110 of the first LED row 11a is an LED other than the final-stage LED of the plurality of LEDs included in the LED row 11, and is also referred to as a third connection LED. The cathode of the third connection LED is the fourth terminal connected to the anode of the LED in the first stage of the second LED string 11b and the third current limiting circuit 15. The LED 110 at the final stage of the second LED row 11b is also referred to as a second connection LED. The cathode of the second connection LED is the third terminal connected to the anode of the first-stage LED of the third LED string 11c and the second current limiting circuit 14.
　第３電流制限回路１５は、第３ＦＥＴ５０と、第３プルアップ抵抗５１と、第３入力抵抗５２と、第３出力抵抗５３と、第３検出抵抗５４と、第３トランジスタ５５と、第３チャタリング防止コンデンサ５６とを有する。第３電流制限回路１５は、第４端子及び第１基準電圧出力端子に接続し、第１基準電圧に応じて平滑された第３電流が、ＬＥＤ列１１に含まれる複数のＬＥＤ１１０の初段のＬＥＤと第３接続ＬＥＤの間のＬＥＤのそれぞれに流れるように、第３電流を制限する。 The third current limiting circuit 15 includes a third FET 50, a third pull-up resistor 51, a third input resistor 52, a third output resistor 53, a third detection resistor 54, a third transistor 55, and a third chattering. And a prevention capacitor 56. The third current limiting circuit 15 is connected to the fourth terminal and the first reference voltage output terminal, and the third current smoothed according to the first reference voltage is the first-stage LED of the plurality of LEDs 110 included in the LED string 11. And limiting the third current to flow through each of the LEDs between and the third connected LED.
　第３トランジスタ５５及び第３チャタリング防止コンデンサ５６の構成及び機能は、第２トランジスタ４５及び第２チャタリング防止コンデンサ４６と同様なので、ここでは詳細な説明は省略する。 Since the configurations and functions of the third transistor 55 and the third chattering prevention capacitor 56 are the same as those of the second transistor 45 and the second chattering prevention capacitor 46, detailed description thereof will be omitted here.
　第３ＦＥＴ５０～第３チャタリング防止コンデンサ５６のそれぞれは、第１ＦＥＴ３０～第１チャタリング防止コンデンサ３６と対応関係にある。第３ＦＥＴ５０は、第１ＦＥＴ３０と同様に商用交流電源１００の実効値変動を打ち消すようにして、第１ＬＥＤ列１１ａに流れる電流値の上限値を制限する。第３電流制限回路１５では、第２ＬＥＤ列１１ｂに電流が流れ始めると、第３検出抵抗５４の一端の電圧が上昇し、第３ＦＥＴ５０がカットオフする。 Each of the third FET 50 to the third chattering prevention capacitor 56 has a correspondence relationship with the first FET 30 to the first chattering prevention capacitor 36. The third FET 50 limits the upper limit value of the current value flowing through the first LED array 11a by canceling the effective value fluctuation of the commercial AC power supply 100, similarly to the first FET 30. In the third current limiting circuit 15, when a current starts to flow in the second LED string 11b, the voltage at one end of the third detection resistor 54 rises and the third FET 50 is cut off.
　（第６実施形態）
　図１１は、第６実施形態に係るＬＥＤ発光装置６の回路図である。第６実施形態に係るＬＥＤ発光装置６は、第１電流制限回路１３ａを第１電流制限回路１３の代わりに有することがＬＥＤ発光装置１と相違する。第１電流制限回路１３ａ以外のＬＥＤ発光装置６の構成要素の構成及び機能は、同一符号が付されたＬＥＤ発光装置１の構成要素の構成及び機能と同一なので、ここでは詳細な説明は省略する。 (Sixth Embodiment)
FIG. 11 is a circuit diagram of the LED light emitting device 6 according to the sixth embodiment. The LED light emitting device 6 according to the sixth embodiment is different from the LED light emitting device 1 in that the LED light emitting device 6 includes a first current limiting circuit 13a instead of the first current limiting circuit 13. The components and functions of the LED light-emitting device 6 other than the first current limiting circuit 13a are the same as the components and functions of the LED light-emitting device 1 denoted by the same reference numerals, and thus detailed description thereof will be omitted here. ..
　第１電流制限回路１３ａは、第１検出抵抗３４と平滑回路１２との間の接続関係、及び第１チャタリング防止コンデンサ３６を有さないことが第１電流制限回路１３と相違する。第１電流制限回路１３ａでは、第１検出抵抗３４の一端は、第１ＦＥＴ３０のソース及び第１出力抵抗３３の他端に接続し、第１検出抵抗３４の他端は、平滑回路１２のグランド端子及び整流回路１０１の電流が戻る端子に接続する。 The first current limiting circuit 13 a differs from the first current limiting circuit 13 in that the first detection resistor 34 and the smoothing circuit 12 are not connected and the first chattering prevention capacitor 36 is not provided. In the first current limiting circuit 13a, one end of the first detection resistor 34 is connected to the source of the first FET 30 and the other end of the first output resistor 33, and the other end of the first detection resistor 34 is the ground terminal of the smoothing circuit 12. And the terminal of the rectifier circuit 101 to which the current returns.
　（第７実施形態）
　ＬＥＤ発光装置１～６では、平滑回路１２をＬＥＤ列１１の第２端子に接続するが、平滑回路１２が出力する第１基準電圧は、商用交流電源１００の実効値に連動して変化すれば良いので、平滑回路１２は、ＬＥＤ列１１の第２端子以外の端子に接続しても良い。例えば、平滑回路１２は、ＬＥＤ列１１の第１端子に接続しても良く、第１ＬＥＤ列１１ａと第２ＬＥＤ列１１ｂの接続点である第３端子に接続しても良い。また、平滑回路１２に含まれる第２平滑抵抗２２、平滑コンデンサ２３の他端は、グランドに接続しても良い。 (Seventh embodiment)
In the LED light emitting devices 1 to 6, the smoothing circuit 12 is connected to the second terminal of the LED array 11, but if the first reference voltage output by the smoothing circuit 12 changes in conjunction with the effective value of the commercial AC power supply 100. Since it is good, the smoothing circuit 12 may be connected to a terminal other than the second terminal of the LED array 11. For example, the smoothing circuit 12 may be connected to the first terminal of the LED array 11 or may be connected to the third terminal which is the connection point of the first LED array 11a and the second LED array 11b. The other ends of the second smoothing resistor 22 and the smoothing capacitor 23 included in the smoothing circuit 12 may be connected to the ground.
　図１２は、第７実施形態に係るＬＥＤ発光装置７の回路図である。第７実施形態に係るＬＥＤ発光装置７は、整流回路１０１及びＬＥＤ列１１と平滑回路１２との間の接続関係がＬＥＤ発光装置１と相違する。整流回路１０１及びＬＥＤ列１１と平滑回路１２との間の接続関係以外のＬＥＤ発光装置７の構成要素の構成及び機能は、同一符号が付されたＬＥＤ発光装置１の構成要素の構成及び機能と同一なので、ここでは詳細な説明は省略する。 FIG. 12 is a circuit diagram of the LED light emitting device 7 according to the seventh embodiment. The LED light emitting device 7 according to the seventh embodiment is different from the LED light emitting device 1 in the connection relationship between the rectifying circuit 101 and the LED array 11 and the smoothing circuit 12. The configurations and functions of the components of the LED light-emitting device 7 other than the connection relationship between the rectifying circuit 101 and the LED array 11 and the smoothing circuit 12 are the same as those of the components of the LED light-emitting device 1 denoted by the same reference numerals. Since they are the same, detailed description is omitted here.
　平滑回路１２は、ＬＥＤ列１１の第２端子ではなく、整流回路１０１の電流を出力する端子及びＬＥＤ列１１の第１端子に接続される。ＬＥＤ発光装置７は、平滑回路１２が整流回路１０１の電流を出力する端子及びＬＥＤ列１１の第１端子に接続されるので、ＬＥＤ列１１における電圧降下の影響を受けることなく第１基準電圧を生成できるので、ＬＥＤ発光装置１よりも第１基準電圧を高くできる。 The smoothing circuit 12 is connected not to the second terminal of the LED string 11 but to the terminal that outputs the current of the rectifying circuit 101 and the first terminal of the LED string 11. In the LED light emitting device 7, since the smoothing circuit 12 is connected to the terminal for outputting the current of the rectifying circuit 101 and the first terminal of the LED string 11, the first reference voltage is supplied without being affected by the voltage drop in the LED string 11. Since it can be generated, the first reference voltage can be made higher than that of the LED light emitting device 1.
　（第８実施形態）
　図１３は、第８実施形態に係るＬＥＤ発光装置８の回路図である。第８実施形態に係るＬＥＤ発光装置８は、平滑回路１２ａを平滑回路１２の代わりに有することがＬＥＤ発光装置１と相違する。平滑回路１２ａ以外のＬＥＤ発光装置８の構成要素の構成及び機能は、同一符号が付されたＬＥＤ発光装置１の構成要素の構成及び機能と同一なので、ここでは詳細な説明は省略する。 (Eighth Embodiment)
FIG. 13 is a circuit diagram of the LED light emitting device 8 according to the eighth embodiment. The LED light emitting device 8 according to the eighth embodiment is different from the LED light emitting device 1 in that it has a smoothing circuit 12a instead of the smoothing circuit 12. The configurations and functions of the components of the LED light emitting device 8 other than the smoothing circuit 12a are the same as the configurations and functions of the components of the LED light emitting device 1 designated by the same reference numerals, and thus detailed description thereof is omitted here.
　平滑回路１２ａは、第１切換ダイオード２４、第３平滑抵抗２５、第４平滑抵抗２６、第２平滑コンデンサ２７、第２ダイオード２８を、第１平滑抵抗２１、第２平滑抵抗２２及び平滑コンデンサ２３に加えて有することが平滑回路１２と相違する。 The smoothing circuit 12 a includes a first switching diode 24, a third smoothing resistor 25, a fourth smoothing resistor 26, a second smoothing capacitor 27, a second diode 28, a first smoothing resistor 21, a second smoothing resistor 22 and a smoothing capacitor 23. In addition to that, the smoothing circuit 12 is different.
　図１４（ａ）は、ＬＥＤ列１１の第１端子の電圧の１周期当たりの経時変化を示す図であり、図１４（ｂ）は、ＬＥＤ列１１の第２端子の電圧の１周期当たりの経時変化を示す図である。図１４（ａ）及び１４（ｂ）において、横軸は時間を示し、図１４（ａ）及び１４（ｂ）のそれぞれの横軸が示す時間は互いに対応する。図１４（ａ）及び１４（ｂ）の縦軸は、電圧示す。 FIG. 14( a) is a diagram showing the change over time in the voltage of the first terminal of the LED string 11 per cycle, and FIG. 14( b) is a diagram showing the change in the voltage of the second terminal of the LED string 11 per cycle. It is a figure which shows a time-dependent change. In FIGS. 14A and 14B, the horizontal axis represents time, and the horizontal axes in FIGS. 14A and 14B correspond to each other. The vertical axis in FIGS. 14A and 14B represents voltage.
　図１４（ａ）において、波形９０１～９０５のそれぞれは、整流回路１０１に入力される交流電圧が変動したときの整流回路１０１によって整流された電圧を示す。波形９０１は、交流電圧の実効値が最も低い状態を示し、波形９０５は、交流電圧の実効値が最も高い状態を示す。 In FIG. 14A, each of waveforms 901 to 905 shows the voltage rectified by the rectifier circuit 101 when the AC voltage input to the rectifier circuit 101 changes. A waveform 901 shows a state where the effective value of the AC voltage is the lowest, and a waveform 905 shows a state where the effective value of the AC voltage is the highest.
　図１４（ｂ）において、波形９１１～９１５のそれぞれは、波形９０１～９０５のそれぞれに対応するＬＥＤ列１１の第２端子の電圧を示す。波形９１１～９１５のそれぞれは、ＬＥＤ列１１に含まれるＬＥＤ１１０が発光を開始する閾値電圧を波形９０１～９０５が示す電圧が超えるまでは０Ｖである。波形９１１～９１５のそれぞれは、閾値電圧を波形９０１～９０５が示す電圧が超えると、上昇する。波形９０１に対応する波形９１１のピーク値は、最も低く、波形９０５に対応する波形９１５のピーク値は、最も高い。 In FIG. 14B, each of the waveforms 911 to 915 indicates the voltage of the second terminal of the LED string 11 corresponding to each of the waveforms 901 to 905. Each of the waveforms 911 to 915 is 0V until the voltage indicated by the waveforms 901 to 905 exceeds the threshold voltage at which the LEDs 110 included in the LED string 11 start emitting light. Each of the waveforms 911-915 rises when the threshold voltage is exceeded by the voltage represented by the waveforms 901-905. The peak value of the waveform 911 corresponding to the waveform 901 is the lowest, and the peak value of the waveform 915 corresponding to the waveform 905 is the highest.
　図１５は、ＬＥＤ発光装置８に入力される交流電圧の実効値と、平滑回路１２ａによって平滑化された電圧との関係を示す図である。図１５において、横軸は、ＬＥＤ発光装置８に入力される交流電圧の実効値を示し、縦軸は、平滑回路１２ａによって平滑化された電圧を示す。 FIG. 15 is a diagram showing the relationship between the effective value of the AC voltage input to the LED light emitting device 8 and the voltage smoothed by the smoothing circuit 12a. In FIG. 15, the horizontal axis represents the effective value of the AC voltage input to the LED light emitting device 8, and the vertical axis represents the voltage smoothed by the smoothing circuit 12a.
　第１基準電圧９３０は、図１３においてＶｆｂで示される第１入力抵抗３２の一端の電圧である。第１平滑電圧９３１は、図１３においてＶｋ１で示される平滑コンデンサ２３の一端の電圧であり、第２平滑電圧９３２は、図１３においてＶｉｎ１で示される第２平滑コンデンサ２７の一端の電圧である。第１平滑電圧９３１は、ＬＥＤ列１１に含まれるＬＥＤ１１０が発光を開始する閾値電圧に交流電圧の実効値が一致したときに０Ｖになる。また、第２平滑電圧９３２は、交流電圧の実効値が０Ｖになるときに０Ｖになる。 The first reference voltage 930 is the voltage at one end of the first input resistor 32, which is indicated by Vfb in FIG. The first smoothed voltage 931 is the voltage at one end of the smoothing capacitor 23 indicated by Vk1 in FIG. 13, and the second smoothed voltage 932 is the voltage at the one end of the second smoothing capacitor 27 indicated by Vin1 in FIG. The first smoothed voltage 931 becomes 0 V when the effective value of the AC voltage matches the threshold voltage at which the LEDs 110 included in the LED string 11 start emitting light. The second smoothed voltage 932 becomes 0V when the effective value of the AC voltage becomes 0V.
　第１平滑電圧９３１が第２平滑電圧９３２よりも高いとき、第１基準電圧９３０は、第１平滑電圧９３１から第１切換ダイオード２４の順電圧だけ電圧降下した電圧である。第１平滑電圧９３１が第２平滑電圧９３２よりも低いとき、第１基準電圧９３０は、第２平滑電圧９３２から第２切換ダイオード２８の順電圧だけ電圧降下した電圧である。 When the first smoothed voltage 931 is higher than the second smoothed voltage 932, the first reference voltage 930 is a voltage dropped from the first smoothed voltage 931 by the forward voltage of the first switching diode 24. When the first smoothed voltage 931 is lower than the second smoothed voltage 932, the first reference voltage 930 is a voltage dropped from the second smoothed voltage 932 by the forward voltage of the second switching diode 28.
　（第９実施形態）
　図１６は、第９実施形態に係るＬＥＤ発光装置９の回路図である。第９実施形態に係るＬＥＤ発光装置９は、平滑回路１２ｂを平滑回路１２の代わりに有することがＬＥＤ発光装置１と相違する。平滑回路１２ｂ以外のＬＥＤ発光装置９の構成要素の構成及び機能は、同一符号が付されたＬＥＤ発光装置１の構成要素の構成及び機能と同一なので、ここでは詳細な説明は省略する。 (9th Embodiment)
FIG. 16 is a circuit diagram of the LED light emitting device 9 according to the ninth embodiment. The LED light emitting device 9 according to the ninth embodiment is different from the LED light emitting device 1 in that the smoothing circuit 12b is provided instead of the smoothing circuit 12. The configurations and functions of the components of the LED light emitting device 9 other than the smoothing circuit 12b are the same as the configurations and functions of the components of the LED light emitting device 1 denoted by the same reference numerals, and thus detailed description thereof will be omitted here.
　平滑回路１２ｂは、演算回路２９を有することが平滑回路１２と相違する。演算回路２９以外の平滑回路１２ｂの構成要素の構成及び機能は、同一符号が付された平滑回路１２の構成要素の構成及び機能と同一なので、ここでは詳細な説明は省略する。 The smoothing circuit 12b differs from the smoothing circuit 12 in that it has an arithmetic circuit 29. The configurations and functions of the components of the smoothing circuit 12b other than the arithmetic circuit 29 are the same as the configurations and functions of the components of the smoothing circuit 12 designated by the same reference numerals, and thus detailed description thereof is omitted here.
　演算回路２９は、例えばＭＰＵ（microprocessor unit）であり、種々のデータに基づいてＬＥＤ列１１の第２端子の電圧を補正して、第１電流制限回路１３に供給する第１基準電圧を演算する。演算回路２９は、整流回路１０１によって全波整流された電圧、ＬＥＤ列１１の第２端子以外の端子の電圧、ＬＥＤ発光装置９の外部の光の光強度を示す照度センサの出力電圧、及び温度を示すサーミスタの出力電圧等に基づいて第１基準電圧を演算する。 The arithmetic circuit 29 is, for example, an MPU (microprocessor unit), corrects the voltage of the second terminal of the LED string 11 based on various data, and calculates the first reference voltage supplied to the first current limiting circuit 13. .. The arithmetic circuit 29 includes a voltage that is full-wave rectified by the rectifying circuit 101, a voltage of a terminal other than the second terminal of the LED array 11, an output voltage of an illuminance sensor that indicates the light intensity of light outside the LED light-emitting device 9, and a temperature. The first reference voltage is calculated based on the output voltage of the thermistor and the like.
　（第１０実施形態）
　図１７は、第１０実施形態に係るＬＥＤ発光装置１０の回路図である。第１０実施形態に係るＬＥＤ発光装置１０は、整流回路１０１と、ＬＥＤ列１１と、平滑回路１２と、第１電流制限回路１３ｂと、第２電流制限回路１４と、第３電流制限回路１５と、第４電流制限回路１６と、第５電流制限回路１７と、第６電流制限回路１８とを有する。また、ＬＥＤ発光装置１０は、過電流防止回路１９を更に有する。整流回路１０１の構成及び機能は、図１等を参照して説明したので、ここでは詳細な説明は省略する。 (10th Embodiment)
FIG. 17 is a circuit diagram of the LED light emitting device 10 according to the tenth embodiment. The LED light emitting device 10 according to the tenth embodiment includes a rectifying circuit 101, an LED array 11, a smoothing circuit 12, a first current limiting circuit 13b, a second current limiting circuit 14, and a third current limiting circuit 15. , A fourth current limiting circuit 16, a fifth current limiting circuit 17, and a sixth current limiting circuit 18. The LED light emitting device 10 further includes an overcurrent prevention circuit 19. Since the configuration and function of the rectifier circuit 101 have been described with reference to FIG. 1 and the like, detailed description thereof will be omitted here.
　ＬＥＤ列１１は、第１ＬＥＤ列１１ｄと、第２ＬＥＤ列１１ｅと、第３ＬＥＤ列１１ｆと、第４ＬＥＤ列１１ｇと、第５ＬＥＤ列１１ｈと、第６ＬＥＤ列１１ｉとを含む。第１ＬＥＤ列１１ｄは、第１ＬＥＤ群１１１、第２ＬＥＤ群１１２と、並列用切換素子１１３と、第１直列用切換素子１１４と、第２直列用切換素子１１５と、第１並列コンデンサ１１６と、第１逆流防止ダイオード１１７と、第１並列抵抗１１８とを有する。 The LED row 11 includes a first LED row 11d, a second LED row 11e, a third LED row 11f, a fourth LED row 11g, a fifth LED row 11h, and a sixth LED row 11i. The first LED group 11d includes a first LED group 111, a second LED group 112, a parallel switching element 113, a first series switching element 114, a second series switching element 115, a first parallel capacitor 116, and a first parallel capacitor 116. It has one backflow prevention diode 117 and a first parallel resistor 118.
　第１ＬＥＤ群１１１及び第２ＬＥＤ群１１２のそれぞれは、直列接続された複数のＬＥＤ１１０を有する。並列用切換素子１１３、第１直列用切換素子１１４及び第２直列用切換素子１１５は、ジャンパーとも称される切断可能な配線素子である。並列用切換素子１１３は、第１ＬＥＤ群１１１の最終段のカソードと第２ＬＥＤ群１１２の初段のアノードとの間に配置される。第１直列用切換素子１１４は、第２ＬＥＤ群１１２の初段のアノードと、第１ＬＥＤ群１１１の初段のアノード及び第２ＬＥＤ群１１２の初段のアノードのそれぞれに接続する配線が分岐する第１分岐点との間に配置される。第２直列用切換素子１１５は、第１ＬＥＤ群１１１の最終段のカソードと、第１ＬＥＤ群１１１の最終段のカソード及び第２ＬＥＤ群１１２の最終段のカソードのそれぞれに接続する配線が分岐する第２分岐点との間に配置される。 Each of the first LED group 111 and the second LED group 112 has a plurality of LEDs 110 connected in series. The parallel switching element 113, the first series switching element 114, and the second series switching element 115 are disconnectable wiring elements also called jumpers. The parallel switching element 113 is arranged between the final stage cathode of the first LED group 111 and the initial stage anode of the second LED group 112. The first series switching element 114 has a first stage anode of the second LED group 112, and a first branch point at which wirings connected to the first stage anode of the first LED group 111 and the first stage anode of the second LED group 112 branch. Is placed between. The second series switching element 115 has a second cathode in which the wiring connected to each of the cathode in the final stage of the first LED group 111, the cathode in the final stage of the first LED group 111, and the cathode in the final stage of the second LED group 112 is branched. It is placed between the junction and the branch point.
　並列用切換素子１１３が切断され、且つ、第１直列用切換素子１１４及び第２直列用切換素子１１５が切断されないとき、第１ＬＥＤ群１１１及び第２ＬＥＤ群１１２は、並列接続される。一方、並列用切換素子１１３が切断されず、且つ、第１直列用切換素子１１４及び第２直列用切換素子１１５が切断されるとき、第１ＬＥＤ群１１１及び第２ＬＥＤ群１１２は、直列接続される。 When the switching element 113 for parallel is cut and the switching element 114 for first series and the switching element 115 for second series are not cut, the first LED group 111 and the second LED group 112 are connected in parallel. On the other hand, when the parallel switching element 113 is not disconnected and the first series switching element 114 and the second series switching element 115 are disconnected, the first LED group 111 and the second LED group 112 are connected in series. ..
　ＬＥＤ発光装置１０は、第１ＬＥＤ列１１ｄが第１ＬＥＤ群１１１及び第２ＬＥＤを直並列切換可能に配置することで、入力される交流電圧が１００Ｖ及び２００Ｖの何れの場合にも対応可能な構成とすることができる。 The LED light emitting device 10 has a configuration in which the first LED group 11d is arranged such that the first LED group 111 and the second LED can be switched in series and parallel so that the input AC voltage is compatible with both 100V and 200V. be able to.
　第１並列コンデンサ１１６及び第１逆流防止ダイオード１１７の構成及び機能は、図６等を参照して説明された第１並列コンデンサ３７及び第１逆流防止ダイオード３８の構成及び機能と同様なので、ここでは詳細な説明は省略する。第１並列抵抗１１８は、第１並列コンデンサ１１６と共に第１ＬＥＤ群１１１及び第２ＬＥＤ群１１２に並列接続される。 The configurations and functions of the first parallel capacitor 116 and the first backflow prevention diode 117 are similar to the configurations and functions of the first parallel capacitor 37 and the first backflow prevention diode 38 described with reference to FIG. Detailed description is omitted. The first parallel resistor 118 is connected in parallel with the first LED group 111 and the second LED group 112 together with the first parallel capacitor 116.
　第２ＬＥＤ列１１ｅ～第６ＬＥＤ列１１ｉのそれぞれは、第１ＬＥＤ列１１ｄと同一の構成及び機能を有するので、ここでは詳細な説明は省略する。また、平滑回路１２は、図１等を参照して説明されたので、ここでは詳細な説明は省略する。 Since each of the second LED row 11e to the sixth LED row 11i has the same configuration and function as the first LED row 11d, detailed description thereof will be omitted here. Since the smoothing circuit 12 has been described with reference to FIG. 1 and the like, detailed description thereof will be omitted here.
　第１電流制限回路１３ｂは、図１等を参照して説明された第１電流制限回路１３と同一の構成を有する４個の回路が並列接続される。第１電流制限回路１３ｂは、第１電流制限回路１３と同一の構成を有する４個の回路が並列接続されることで、ＦＥＴのそれぞれに流れる電流を低減し、ＬＥＤ発光装置１０が発光する間のＦＥＴの温度の上昇を低減する。 In the first current limiting circuit 13b, four circuits having the same configuration as the first current limiting circuit 13 described with reference to FIG. 1 and the like are connected in parallel. The first current limiting circuit 13b is configured such that four circuits having the same configuration as the first current limiting circuit 13 are connected in parallel to reduce the current flowing through each of the FETs and the LED light emitting device 10 emits light. The increase in the temperature of the FET is reduced.
　第２電流制限回路１４～第６電流制限回路１８のそれぞれは、図１等を参照して説明された第１電流制限回路１３と同様の構成及び機能を有するので、ここでは詳細な説明は省略する。 Since each of the second current limiting circuit 14 to the sixth current limiting circuit 18 has the same configuration and function as the first current limiting circuit 13 described with reference to FIG. 1 and the like, detailed description thereof is omitted here. To do.
　過電流防止回路１９は、電流制限抵抗９１と、ツェナーダイオード９２と、電流制限ＦＥＴ９３とを有する。電流制限抵抗９１は、整流回路１０１の電流を出力する端子とＬＥＤ列１１に含まれる複数のＬＥＤの初段のＬＥＤのアノードとの間に一端が接続する。ツェナーダイオード９２は、電流制限抵抗９１の他端にカソードが接続し、整流回路１０１の電流が戻る端子にアノードが接続する。電流制限ＦＥＴ９３は、電流制限抵抗９１の他端にゲートが接続し、第２電流制限回路１４～第６電流制限回路１８を介して第１電流制限回路１３ｄにドレインが接続し、整流回路１０１の電流が戻る端子にソースが接続する。 The overcurrent prevention circuit 19 has a current limiting resistor 91, a Zener diode 92, and a current limiting FET 93. The current limiting resistor 91 has one end connected between the terminal for outputting the current of the rectifying circuit 101 and the anode of the first-stage LED of the plurality of LEDs included in the LED array 11. In the Zener diode 92, the cathode is connected to the other end of the current limiting resistor 91, and the anode is connected to the terminal to which the current of the rectifier circuit 101 returns. The gate of the current limiting FET 93 is connected to the other end of the current limiting resistor 91, the drain is connected to the first current limiting circuit 13d through the second current limiting circuit 14 to the sixth current limiting circuit 18, and the current limiting FET 93 of the rectifying circuit 101 is connected. The source is connected to the terminal where the current returns.
　過電流防止回路１９では、一例では１２Ｖであるツェナーダイオード９２のツェナー電圧よりも整流回路が全波整流する電圧が高くなり、ツェナーダイオード９２にツェナー電流が流れると、電流制限ＦＥＴ９３がオンする。ツェナーダイオード９２にツェナー電流が流れる間、電流制限ＦＥＴ９３は、ゲート電圧がツェナーダイオード９２のツェナー電圧に一致したときのドレイン電流以上の電流が流れないように電流を制限する電流制限素子として機能する。 In the overcurrent prevention circuit 19, the voltage for full-wave rectification by the rectifier circuit becomes higher than the Zener voltage of the Zener diode 92, which is 12 V in one example, and when the Zener current flows through the Zener diode 92, the current limiting FET 93 turns on. While the Zener current flows through the Zener diode 92, the current limiting FET 93 functions as a current limiting element that limits the current so that a current equal to or larger than the drain current when the gate voltage matches the Zener voltage of the Zener diode 92 does not flow.
　ＬＥＤ発光装置１０は、電流制限素子として機能する電流制限ＦＥＴ９３を有する過電流防止回路１９を有することで、整流回路１０１の入力に過電圧が印加された場合でもＬＥＤ列１１に含まれる複数のＬＥＤ１１０に流れる電流を制限することができる。第１電流制限回路１３ｂ～第６電流制限回路１８のそれぞれのＦＥＴのドレイン電圧がブレークダウン電圧に達したときのＦＥＴの耐電圧は、ＦＥＴのブレークダウン電圧の２倍にＬＥＤ列に含まれる複数のＬＥＤ１１０による電圧降下分を加算した電圧である。 The LED light-emitting device 10 has the overcurrent prevention circuit 19 having the current limiting FET 93 that functions as a current limiting element, so that even when an overvoltage is applied to the input of the rectifier circuit 101, the LED light emitting device 10 is provided with a plurality of LEDs 110 included in the LED string 11. The flowing current can be limited. When the drain voltage of each FET of the first current limiting circuit 13b to the sixth current limiting circuit 18 reaches the breakdown voltage, the withstand voltage of the FET is twice as large as the breakdown voltage of the FET and is included in the LED string. Is a voltage obtained by adding the voltage drop due to the LED 110.
　図１８（ａ）は、ＬＥＤ発光装置９の斜視図であり、図１８（ｂ）は、ＬＥＤ発光装置９の平面図であり、図１８（ｃ）は、ＬＥＤ発光装置１０の側面図である。 18A is a perspective view of the LED light emitting device 9, FIG. 18B is a plan view of the LED light emitting device 9, and FIG. 18C is a side view of the LED light emitting device 10. ..
　ＬＥＤ発光装置１０は、ＬＥＤ、電解コンデンサ、抵抗及びＦＥＴ等のＬＥＤ発光装置９を形成するディスクリート品である種々の構成要素が搭載される回路基板９０を有する。回路基板９０には、ＬＥＤ１１０、ＦＥＴ３０及び電解コンデンサである第１並列コンデンサ１１６等が搭載される。 The LED light emitting device 10 has a circuit board 90 on which various components, which are discrete products forming the LED light emitting device 9 such as an LED, an electrolytic capacitor, a resistor, and a FET, are mounted. The LED 110, the FET 30, the first parallel capacitor 116, which is an electrolytic capacitor, and the like are mounted on the circuit board 90.
　回路基板９０の外側には、ＬＥＤ１１０が配置され、ＬＥＤ１１０の内側には、ＦＥＴ３０及び抵抗等が配置され、ＦＥＴ３０及び抵抗等の内側には、第１並列コンデンサ１１６が配置される。回路基板９０のＬＥＤ１１０、ＦＥＴ３０及び抵抗等が配置される領域の裏面にはヒートシンク９５が配置される。 The LED 110 is arranged outside the circuit board 90, the FET 30 and the resistor are arranged inside the LED 110, and the first parallel capacitor 116 is arranged inside the FET 30 and the resistor. A heat sink 95 is arranged on the back surface of the area of the circuit board 90 where the LED 110, the FET 30, the resistor and the like are arranged.
　ＬＥＤ発光装置１０は、ＬＥＤ１１０を回路基板９０の外周に配置し、且つ、高さが高い第１並列コンデンサ１１６を回路基板９０の中心に配置することで、ＬＥＤ１１０が発した光を第１並列コンデンサ１１６が遮って発光効率が低下するおそれが低い。また、ＬＥＤ発光装置１０は、同一の素子を所定の領域に集めて配置することで、効率的な配線が可能になる。 In the LED light emitting device 10, the LED 110 is arranged on the outer periphery of the circuit board 90, and the first parallel capacitor 116 having a high height is arranged at the center of the circuit board 90, so that the light emitted by the LED 110 is generated by the first parallel capacitor. There is a low risk that the light-emission efficiency will be reduced by blocking 116. Further, in the LED light emitting device 10, by arranging the same elements collectively in a predetermined area, efficient wiring can be performed.
　また、ＬＥＤ発光装置１０は、回路基板９０の中心の配線経路を確保しつつ、ＬＥＤ及びＦＥＴ３０等の発熱部品をヒートシンク９５上に配置することで、放熱性は担保しつつ、ＬＥＤ発光装置１０を搭載する発光器具のサイズの最小化が可能になる。 In addition, the LED light emitting device 10 arranges the heat generating components such as the LED and the FET 30 on the heat sink 95 while ensuring the wiring route at the center of the circuit board 90, thereby ensuring the heat radiation property and maintaining the LED light emitting device 10. It is possible to minimize the size of the light emitting device installed.
　図１９は、第１０実施形態に係るＬＥＤ発光装置１０の変形例に係るＬＥＤ発光装置の回路図１０´である。ＬＥＤ発光装置１０の変形例に係るＬＥＤ発光装置１０´は、第１電流制限回路１３ｃを第１電流制限回路１３ｂの代わりに有することがＬＥＤ発光装置１０と相違する。第１電流制限回路１３ｃ以外のＬＥＤ発光装置１０´の構成要素の構成及び機能は、同一符号が付されたＬＥＤ発光装置１０の構成要素の構成及び機能と同一なので、ここでは詳細な説明は省略する。 FIG. 19 is a circuit diagram 10 ′ of an LED light emitting device according to a modification of the LED light emitting device 10 according to the tenth embodiment. An LED light emitting device 10 ′ according to a modified example of the LED light emitting device 10 differs from the LED light emitting device 10 in that it has a first current limiting circuit 13 c instead of the first current limiting circuit 13 b. The configurations and functions of the components of the LED light emitting device 10' other than the first current limiting circuit 13c are the same as the configurations and functions of the components of the LED light emitting device 10 denoted by the same reference numerals, and thus detailed description thereof is omitted here. To do.
　第１電流制限回路１３ｃは、並列接続された４個の第１ＦＥＴ３０を単一の第１ＦＥＴ３０の代わりに有することが第１電流制限回路１３と相違する。第１電流制限回路１３ｃは、並列接続された４個の第１ＦＥＴ３０を有することで、第１ＦＥＴ３０のそれぞれに流れる電流を低減し、ＬＥＤ発光装置１０´が発光する間のＦＥＴの温度の上昇を低減する。 The first current limiting circuit 13c is different from the first current limiting circuit 13 in that it has four first FETs 30 connected in parallel instead of the single first FET 30. The first current limiting circuit 13c has the four first FETs 30 connected in parallel, so that the current flowing through each of the first FETs 30 is reduced, and the temperature rise of the FETs while the LED light emitting device 10' emits light is reduced. To do.
　（実施形態に係るＬＥＤ発光装置の変形例）
　説明された実施形態では、第１電流制限回路が有する第１電流制限素子は、ＦＥＴであるが、実施形態に係るＬＥＤ発光装置は、トランジスタをＦＥＴの代わりに第１電流制限素子として有してもよい。トランジスタをＦ第１電流制限素子として使用するとき、第２端子に接続する第１電流入力端子はコレクタであり、第１電流入力端子との間に第１電流が流れる第２端子はエミッタである。また、印加される電圧に応じて第１電流を制御する第１制御端子は、ベースである。 (Modification of the LED light emitting device according to the embodiment)
In the described embodiment, the first current limiting element included in the first current limiting circuit is the FET, but the LED light emitting device according to the embodiment has the transistor as the first current limiting element instead of the FET. Good. When the transistor is used as the F first current limiting element, the first current input terminal connected to the second terminal is the collector and the second terminal through which the first current flows is the emitter. .. Further, the first control terminal that controls the first current according to the applied voltage is the base.
　また、説明された実施形態では、第１電流制限回路が有する第１制御素子は、トランジスタであるが、実施形態に係るＬＥＤ発光装置は、可変抵抗部及び第２基準電圧端子に対応する構成を有する素子をトランジスタの代わりに第１制御素子として有してもよい。例えば、実施形態に係るＬＥＤ発光装置は、シャントレギュレータを第１制御素子として有してもよい。 Further, in the described embodiment, the first control element included in the first current limiting circuit is a transistor, but the LED light emitting device according to the embodiment has a configuration corresponding to the variable resistance portion and the second reference voltage terminal. The element to be included may be included as the first control element instead of the transistor. For example, the LED light emitting device according to the embodiment may include a shunt regulator as the first control element.
　なお、実施形態に係るＬＥＤ発光装置は、以下に示す態様であってもよい。
（１）商用交流電源を全波整流する整流回路と、
　整流回路と接続し、複数のＬＥＤが直列接続したＬＥＤ列と、
　ＬＥＤ列と接続する電流制限素子と、
　電流制限素子と接続する電流検出抵抗と、
　コンデンサ及び２個の抵抗を含み、ＬＥＤ列に接続する積分回路と、
　２個の抵抗を含み、積分回路の出力電圧と電流検出抵抗の一端の電圧を加算する加算部と、
　トランジスタ及び抵抗を含み、トランジスタのベースが加算部に接続し、トランジスタのコレクタが抵抗及び電流制限素子の制御端子に接続する反転増幅器とを備える
　ことを特徴とするＬＥＤ発光装置。
（２）ＬＥＤ列は、第１部分ＬＥＤ列と第２部分ＬＥＤ列を含み、
　第１部分ＬＥＤ列と第２部分ＬＥＤ列は、順に整流回路側から直列接続し、
　第１部分ＬＥＤ列と第２部分ＬＥＤ列の接続点に接続する他の電流制限素子と、
　他の電流制限素子に接続する他の電流検出抵抗と、
　２つの抵抗を含み、積分回路の出力電圧と他の電流検出抵抗の一端の電圧を加算する他の加算部と、
　トランジスタ及び抵抗を含み、トランジスタのベースが他の加算部に接続し、トランジスタのコレクタが抵抗及び他の電流制限素子の制御端子に接続する他の反転増幅器とを備え、
　第２部分ＬＥＤ列を流れる電流が、他の電流検出回路に流れ込む
　ことを特徴とする（１）に記載のＬＥＤ発光装置。
（３）反転増幅器に含まれるトランジスタ及び他の反転増幅器に含まれるトランジスタは、それぞれコレクタとエミッタ間に抵抗を並列接続している
　ことを特徴とする（１）又は（２）に記載のＬＥＤ発光装置。 The LED light emitting device according to the embodiment may have the following modes.
(1) Rectifier circuit for full-wave rectification of commercial AC power supply,
An LED string that is connected to a rectifier circuit and has a plurality of LEDs connected in series,
A current limiting element connected to the LED string,
A current detection resistor connected to the current limiting element,
An integrating circuit including a capacitor and two resistors, which is connected to the LED string,
An adder unit that includes two resistors and adds the output voltage of the integrating circuit and the voltage at one end of the current detection resistor;
An LED light-emitting device comprising: a transistor and a resistor, the base of the transistor being connected to the adder, and the collector of the transistor being connected to the resistor and the control terminal of the current limiting element.
(2) The LED row includes a first partial LED row and a second partial LED row,
The first partial LED row and the second partial LED row are serially connected in order from the rectifier circuit side,
Another current limiting element connected to a connection point between the first partial LED string and the second partial LED string,
Another current detection resistor connected to another current limiting element,
Another adder including two resistors and adding the output voltage of the integrating circuit and the voltage at one end of the other current detection resistor,
Another inverting amplifier including a transistor and a resistor, the base of the transistor connected to the other adder, and the collector of the transistor connected to the resistor and the control terminal of the other current limiting element.
The LED light emitting device according to (1), wherein the current flowing through the second partial LED string flows into another current detection circuit.
(3) The LED light emission according to (1) or (2), wherein a transistor included in the inverting amplifier and a transistor included in another inverting amplifier each have a resistor connected in parallel between the collector and the emitter. apparatus.

Claims (11)

  1. 　電流を出力する端子と電流が戻る端子を有する整流回路と、
    　第１端子と第２端子を有するＬＥＤ列と、
    　電圧入力端子及び第１基準電圧出力端子を備える平滑回路と、
    　第１電流入力端子、第１電流出力端子及び第１基準電圧入力端子を備える第１電流制限回路と、を備え、
    　前記電流を出力する端子は、前記第１端子に接続し、
    　前記第２端子は、前記第１電流入力端子に接続し、
    　前記電圧入力端子は、前記電流を出力する端子から前記第２端子に至る電流経路に接続し、
    　前記第１基準電圧出力端子は、前記第１基準電圧入力端子に接続し、
    　前記第１電流出力端子は、前記電流が戻る端子に接続し、
    　前記整流回路は、交流電圧を全波整流し、
    　前記平滑回路は、前記電圧入力端子の電圧を平滑し、平滑した電圧を前記第１基準電圧出力端子から出力し、
    　前記第１電流制限回路は、前記ＬＥＤ列に含まれるＬＥＤが発光しているとき、前記第１電流入力端子に流れる電流が前記第１基準電圧入力端子の電圧で調整される、
    ことを特徴とする、ＬＥＤ発光装置。     A rectifier circuit having a terminal for outputting a current and a terminal for returning the current,
    An LED array having a first terminal and a second terminal,
    A smoothing circuit having a voltage input terminal and a first reference voltage output terminal;
    A first current limiting circuit having a first current input terminal, a first current output terminal and a first reference voltage input terminal;
    The terminal for outputting the current is connected to the first terminal,
    The second terminal is connected to the first current input terminal,
    The voltage input terminal is connected to a current path from the terminal that outputs the current to the second terminal,
    The first reference voltage output terminal is connected to the first reference voltage input terminal,
    The first current output terminal is connected to a terminal to which the current returns,
    The rectifier circuit performs full-wave rectification of an AC voltage,
    The smoothing circuit smoothes the voltage of the voltage input terminal, and outputs the smoothed voltage from the first reference voltage output terminal,
    The first current limiting circuit adjusts a current flowing through the first current input terminal with a voltage at the first reference voltage input terminal when an LED included in the LED string emits light.
    An LED light emitting device, characterized in that
  2. 　前記第１電流制限回路は、
    　第１制御端子に印加される電圧に応じて前記第１電流入力端子から前記第１電流出力端子の間を流れる第１電流を制御する第１電流制限素子と、
    　前記第１電流入力端子に一端が接続し、前記第１制御端子に他端が接続する第１プルアップ抵抗と、
    　前記第１基準電圧入力端子に一端が接続する第１入力抵抗と、
    　前記第１入力抵抗の他端に一端が接続し、前記第１電流制限素子の電流出力端子に他端が接続する第１出力抵抗と、
    　前記第１電流出力端子の他端に一端が接続する第１検出抵抗と、
    　前記第１プルアップ抵抗に可変抵抗部が直列接続される第１制御素子と、を備え、
    　前記第１制御素子は、前記第１入力抵抗の他端及び前記第１出力抵抗の一端に接続する第２基準電圧端子を有し、前記第２基準電圧端子の電圧が第２基準電圧と一致するように前記可変抵抗部の抵抗を変化して前記第１制御端子の電圧を制御する、請求項１に記載のＬＥＤ発光装置。     The first current limiting circuit,
    A first current limiting element that controls a first current flowing between the first current input terminal and the first current output terminal according to a voltage applied to a first control terminal;
    A first pull-up resistor having one end connected to the first current input terminal and the other end connected to the first control terminal;
    A first input resistor having one end connected to the first reference voltage input terminal;
    A first output resistor having one end connected to the other end of the first input resistor and the other end connected to a current output terminal of the first current limiting element;
    A first detection resistor having one end connected to the other end of the first current output terminal;
    A first control element in which a variable resistance portion is connected in series to the first pull-up resistor,
    The first control element has a second reference voltage terminal connected to the other end of the first input resistor and one end of the first output resistor, and the voltage of the second reference voltage terminal matches the second reference voltage. The LED light emitting device according to claim 1, wherein the resistance of the variable resistance portion is changed to control the voltage of the first control terminal.
  3. 　前記第１制御素子の前記可変抵抗部に並列接続された第１並列抵抗を更に有する、請求項２に記載のＬＥＤ発光装置。 The LED light emitting device according to claim 2, further comprising a first parallel resistor connected in parallel to the variable resistance portion of the first control element.
  4. 　前記第１電流制限回路は、前記第１出力抵抗に並列接続されたチャタリング防止コンデンサを更に有する、請求項２又は３に記載のＬＥＤ発光装置。 The LED light emitting device according to claim 2 or 3, wherein the first current limiting circuit further includes a chattering prevention capacitor connected in parallel to the first output resistor.
  5. 　並列接続された複数の前記第１電流制限回路を有する、請求項２～４の何れか一項に記載のＬＥＤ発光装置。 The LED light emitting device according to any one of claims 2 to 4, which has a plurality of the first current limiting circuits connected in parallel.
  6. 　前記第１電流制限素子は、並列接続された複数のＦＥＴを含む、請求項２～４の何れか一項に記載のＬＥＤ発光装置。 The LED light emitting device according to any one of claims 2 to 4, wherein the first current limiting element includes a plurality of FETs connected in parallel.
  7. 　前記複数のＬＥＤの最終段のＬＥＤ以外のＬＥＤである第２接続ＬＥＤのカソードに接続する第３端子と、
    　第１電流入力端子、第２電流入力端子、第１基準電圧入力端子、及び第２電流出力端子を備える第２電流制限回路を更に有し、
    　前記第１電流入力端子は、前記第１電流制限回路の第１電流出力端子と接続し、
    　前記第２電流入力端子は、前記３端子と接続し、
    　前記第１基準電圧入力端子は、前記平滑回路の前記第１基準電圧出力端子に接続し、
    　前記２電流出力端子は、前記第１電流入力端子及び前記第２電流入力端子から流入した電流を出力し、
    　前記第１電圧基準電圧入力端子の電圧は、前記第２電流入力端子に流れる電流を調整する、請求項１～６の何れか一項に記載のＬＥＤ発光装置。     A third terminal connected to the cathode of the second connection LED, which is an LED other than the final-stage LED of the plurality of LEDs,
    Further comprising a second current limiting circuit having a first current input terminal, a second current input terminal, a first reference voltage input terminal, and a second current output terminal,
    The first current input terminal is connected to the first current output terminal of the first current limiting circuit,
    The second current input terminal is connected to the three terminals,
    The first reference voltage input terminal is connected to the first reference voltage output terminal of the smoothing circuit,
    The second current output terminal outputs a current flowing from the first current input terminal and the second current input terminal,
    The LED light emitting device according to any one of claims 1 to 6, wherein the voltage of the first voltage reference voltage input terminal adjusts a current flowing through the second current input terminal.
  8. 　前記第２電流制限回路は、
    　第２制御端子に印加される電圧に応じて、前記第２電流入力端子から流れ込む第２電流を制御する第２電流制限素子と、
    　前記第２電流入力端子に一端が接続し、前記第２制御端子に他端が接続する第２プルアップ抵抗と、
    　前記第１基準電圧入力端子に一端が接続する第２入力抵抗と、
    　前記第２入力抵抗の他端に一端が接続し、前記第１電流入力端子に他端が接続する第２出力抵抗と、
    　前記第２電流制限素子の電流出力端子及び前記第１電流入力端子に一端が接続し、他端が前記第２電流出力端子に接続する第２検出抵抗と、
    　前記第２プルアップ抵抗に可変抵抗部が直列接続される第２制御素子と、を有し、
    　前記第２制御素子は、前記第２入力抵抗の他端及び前記第２出力抵抗の一端に接続する第２基準電圧端子を有し、前記第２基準電圧端子の電圧が第２基準電圧と一致するように前記可変抵抗部の抵抗を変化して前記第２制御端子の電圧を制御する、請求項７に記載のＬＥＤ発光装置。     The second current limiting circuit,
    A second current limiting element for controlling a second current flowing from the second current input terminal according to a voltage applied to the second control terminal;
    A second pull-up resistor having one end connected to the second current input terminal and the other end connected to the second control terminal;
    A second input resistor having one end connected to the first reference voltage input terminal;
    A second output resistor having one end connected to the other end of the second input resistor and the other end connected to the first current input terminal;
    A second detection resistor having one end connected to the current output terminal and the first current input terminal of the second current limiting element, and the other end connected to the second current output terminal;
    A second control element in which a variable resistance portion is connected in series to the second pull-up resistor,
    The second control element has a second reference voltage terminal connected to the other end of the second input resistor and one end of the second output resistor, and the voltage of the second reference voltage terminal matches the second reference voltage. The LED light emitting device according to claim 7, wherein the resistance of the variable resistance portion is changed so as to control the voltage of the second control terminal.
  9. 　前記整流回路の電流を出力する端子と前記複数のＬＥＤの初段のＬＥＤのアノードとの間に一端が接続する電流制限抵抗と、
    　前記電流制限抵抗の他端にカソードが接続し、前記整流回路の電流が戻る端子にアノードが接続するツェナーダイオードと、
    　前記電流制限抵抗の他端にゲートが接続し、前記第１電流制限回路にソースが接続し、前記整流回路の電流が戻る端子にドレインが接続する電流制限ＦＥＴと、
    　を有する過電流防止回路を更に有する、請求項１～８の何れか一項に記載のＬＥＤ発光装置。     A current limiting resistor having one end connected between a terminal for outputting a current of the rectifying circuit and an anode of the first-stage LED of the plurality of LEDs;
    A cathode is connected to the other end of the current limiting resistor, and a Zener diode whose anode is connected to a terminal to which the current of the rectifier circuit returns,
    A current limiting FET having a gate connected to the other end of the current limiting resistor, a source connected to the first current limiting circuit, and a drain connected to a terminal to which the current of the rectifier circuit returns,
    9. The LED light-emitting device according to claim 1, further comprising an overcurrent prevention circuit having:
  10. 　前記ＬＥＤ列は、
    　直列接続された複数のＬＥＤを含む第１ＬＥＤ群と、
    　直列接続された複数のＬＥＤを含む第２ＬＥＤ群と、
    　前記第１ＬＥＤ群の初段のアノード及び前記第２ＬＥＤ群の初段のアノードのそれぞれに接続する配線が分岐する第１分岐点と、
    　前記第１ＬＥＤ群の最終段のカソード及び前記第２ＬＥＤ群の最終段のカソードのそれぞれに接続する配線が分岐する第２分岐点と、
    　前記第１ＬＥＤ群の最終段のカソードと前記第２ＬＥＤ群の初段のアノードとの間に切断可能に配置された並列用切換素子と、
    　前記第２ＬＥＤ群の初段のアノードと前記第１分岐点との間に切断可能に配置された第１直列用切換素子と、
    　前記第１ＬＥＤ群の最終段のカソードと前記第２分岐点との間に切断可能に配置された第２直列用切換素子と、
    　を有する、請求項１～９の何れか一項に記載のＬＥＤ発光装置。     The LED array is
    A first LED group including a plurality of LEDs connected in series;
    A second LED group including a plurality of LEDs connected in series;
    A first branch point at which a wiring connected to each of the first-stage anode of the first LED group and the first-stage anode of the second LED group branches;
    A second branch point at which a wiring connected to each of the final stage cathode of the first LED group and the final stage cathode of the second LED group branches;
    A switching element for parallel connection cutably disposed between the cathode of the last stage of the first LED group and the anode of the first stage of the second LED group;
    A first series switching element that is cutably disposed between the first-stage anode of the second LED group and the first branch point;
    A second series switching element that is severably arranged between the last-stage cathode of the first LED group and the second branch point;
    The LED light emitting device according to claim 1, further comprising:
  11. 　前記ＬＥＤ列に並列接続された並列コンデンサと、
    　前記ＬＥＤ列の初段のアノード及び前記並列コンデンサと前記整流回路との間に配置された逆流防止ダイオードと、
    　を更に有する、請求項１～１０の何れか一項に記載のＬＥＤ発光装置。     A parallel capacitor connected in parallel to the LED string;
    A backflow prevention diode disposed between the rectifier circuit and the first stage anode of the LED string and the parallel capacitor;
    The LED light emitting device according to any one of claims 1 to 10, further comprising:
PCT/JP2019/049034 2018-12-13 2019-12-13 Led light emission device WO2020122249A1 (en)

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