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WO2020122249A1 - Dispositif d'émission de lumière à del - Google Patents

Dispositif d'émission de lumière à del 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
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2019/049034
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English (en)
Japanese (ja)
Inventor
圭亮 堺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Citizen Electronics Co Ltd
Citizen Watch Co Ltd
Original Assignee
Citizen Electronics Co Ltd
Citizen Watch Co Ltd
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.)
Filing date
Publication date
Application filed by Citizen Electronics Co Ltd, Citizen Watch Co Ltd filed Critical Citizen Electronics Co Ltd
Priority to CN201980081634.5A priority Critical patent/CN113170552B/zh
Priority to JP2020559351A priority patent/JP6921340B2/ja
Publication of WO2020122249A1 publication Critical patent/WO2020122249A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details

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.

Landscapes

  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention porte sur un dispositif d'émission de lumière à diodes électroluminescentes (DEL) qui comprend : un circuit redresseur ayant une borne qui délivre du courant et une borne à laquelle le courant retourne ; un groupement de DEL ayant une première borne et une seconde borne ; un circuit de lissage ayant une borne d'entrée de tension et une borne de sortie de première tension de référence ; et un circuit limiteur de premier courant ayant une borne d'entrée de premier courant, une borne de sortie de premier courant et une borne d'entrée de première tension de référence. La borne qui délivre du courant est connectée à la première borne. La seconde borne est connectée à la borne d'entrée de premier courant. La borne d'entrée de tension est connectée à un chemin de courant allant de la borne qui délivre du courant à la seconde borne. La borne de sortie de première tension de référence est connectée à la borne d'entrée de première tension de référence. La borne de sortie de premier courant est connectée à la borne à laquelle le courant retourne. Le circuit redresseur effectue un redressement double alternance d'une tension alternative. Le circuit de lissage lisse la tension présente au niveau de la borne d'entrée de tension, et délivre la tension lissée au niveau de la borne de sortie de première tension de référence. Le circuit limiteur de premier courant règle le courant circulant à travers la borne d'entrée de premier courant au moyen de la tension présente au niveau de la borne d'entrée de première tension de référence lorsqu'une DEL incluse dans le réseau de DEL émet de la lumière.
PCT/JP2019/049034 2018-12-13 2019-12-13 Dispositif d'émission de lumière à del Ceased WO2020122249A1 (fr)

Priority Applications (2)

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CN201980081634.5A CN113170552B (zh) 2018-12-13 2019-12-13 Led发光装置
JP2020559351A JP6921340B2 (ja) 2018-12-13 2019-12-13 Ｌｅｄ発光装置

Applications Claiming Priority (2)

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JP2018-233351 2018-12-13
JP2018233351 2018-12-13

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WO2020122249A1 true WO2020122249A1 (fr) 2020-06-18

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CN113170552B (zh) 2023-07-14
CN113170552A (zh) 2021-07-23
JP6921340B2 (ja) 2021-08-18

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