JP2012160284A - Led lighting device, luminaire, and lighting control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device arranged so that a phase control element of a phase control type dimmer can be prevented from being brought out of conduction even when an instantaneous voltage drop occurs in a source voltage, a luminaire having the LED lighting device, and a lighting control system having the luminaire.SOLUTION: An LED lighting device 1 comprises: a phase control type dimmer 8; an AC-to-DC converter circuit 2 having a rectifier 11 to which an AC voltage from the phase control type dimmer 8 is input, and a smoothing capacitor C1 connected between outputs of the rectifier 11; a current regulator circuit 3 operable to convert a DC voltage output by the AC-to-DC converter circuit 2 into a DC voltage according to the AC voltage input to the rectifier 11; a bypass circuit 5 connected between the outputs of the rectifier 11, and formed so as to be capable of causing a current equal to or higher than a holding current to flow through a phase control element 13 of the phase control type dimmer 8; and a drive circuit 6 operable to detect an instantaneous voltage drop of the AC voltage input to the rectifier 11, and operate the bypass circuit 5 according to the instantaneous voltage drop.

Description

  One embodiment of the present invention relates to an LED lighting device that dimms and lights a light emitting diode as a light source by a phase control dimmer, an illumination device including the LED lighting device, and an illumination control system including the illumination device.

  Light emitting diodes are rapidly used in general lighting devices as an alternative light source for incandescent bulbs and discharge lamps due to the recent increase in output and power saving, long life and low calorific value. Further, dimming lighting is performed also in an illumination device using a light emitting diode as a light source.

  Conventionally, dimming control of an incandescent lamp or the like has been performed using a phase control dimmer that controls the conduction angle of an AC voltage. The phase control dimmer is also used for an illumination device using a light emitting diode as a light source. That is, it is a good idea to avoid replacing the phase control dimmer and changing the wiring as much as possible due to costs and construction.

  However, since the light emitting diode has a light load and becomes lighter as the light is dimmed, the phase control dimmer flows to the phase control element, for example, the triac when the light emitting diode is deeply dimmed. The current may fall below the holding current of the phase control element, and the phase control element may turn off. In addition, the phase control dimmer is provided with a noise filter circuit composed of, for example, an LC circuit, and the current flowing through the phase control element is less than the holding current due to resonance of the noise filter circuit, and the phase control element is turned off. is there. For this reason, some phase control dimmers are connected to a pseudo load such as a light bulb or a resistor together with an illumination device using a light emitting diode as a light source. Here, since the pseudo load generates a power loss corresponding to the pseudo load, it is desirable that the pseudo load is as light as possible to the extent that the holding current can flow through the phase control element.

  In addition, in order to cause a holding current to flow through the phase control element, for example, a bypass circuit may be used to draw current from a current supply line that supplies current to the light emitting diode (see, for example, Patent Document 1). ). The LED drive circuit of Patent Document 1 includes, for example, a voltage detection circuit that detects an input voltage or a voltage obtained by rectifying the input voltage, and controls current extraction from a current supply line based on a detection result of the voltage detection circuit. Is. That is, the detection voltage detected by the voltage detection circuit is compared with a predetermined comparison voltage. When the detection voltage is smaller than the comparison voltage, the current is drawn from the current supply line by the bypass circuit, and when the detection voltage is larger than the comparison voltage, the current is not drawn from the current supply line. .

  By the way, the commercial AC power supply may be connected to an electrical device connected to another phase controller, for example, a thermal device with relatively high power consumption, in addition to the lighting device. Then, when the phase control element of the phase controller is turned on, the inrush current flows instantaneously into the electrical equipment, so that the AC voltage of the commercial AC power supply instantaneously decreases due to the influence of the power supply impedance. May cause distortion. At this time, a power supply voltage with a distorted waveform is input to the lighting device connected to the same system.

Japanese Patent Laying-Open No. 2010-212267 (page 8, FIG. 2)

  In the LED lighting device to which a light load pseudo load is connected, when an instantaneous voltage drop occurs in the AC voltage, the current flowing through the pseudo load decreases, so the current flowing through the phase control element falls below the holding current, and the phase control element May turn off. Here, even if the bypass circuit as shown in Patent Document 1 is provided, if the voltage value at the time when the instantaneous voltage drops is larger than the comparison voltage, current extraction from the current supply line is not performed by the bypass circuit. That is, the instantaneous voltage drop occurs at any point in the AC voltage waveform, and depending on the point in time, current drawing from the current supply line is not performed and the phase control element is turned off. As a result, there is a problem in that a problem such as flickering occurs in the light emitting diode.

  The present invention relates to an LED lighting device in which a phase control element of a phase control dimmer is prevented from becoming non-conductive even when an instantaneous voltage drop occurs in a power supply voltage, an illumination device including the LED lighting device, and this An object of the present invention is to provide an illumination control system including an illumination device.

  The LED lighting device according to the embodiment of the present invention includes an AC-DC conversion circuit, a current adjustment circuit, a bypass circuit, and a drive circuit.

  The AC-DC conversion circuit includes a rectifier that receives an AC voltage from a phase control dimmer, and a smoothing capacitor that is connected between the outputs of the rectifier. Then, the AC voltage is converted into a DC voltage by the rectifier and the smoothing capacitor and is output between both ends of the smoothing capacitor.

  The current adjustment circuit is formed to convert the DC voltage output from the AD-DC conversion circuit into a DC voltage corresponding to the AC voltage input to the rectifier. And the electric current according to the said DC voltage is supplied to a light emitting diode by applying the said DC voltage between the both ends of a light emitting diode.

  The bypass circuit is connected between the outputs of the rectifier and is formed so as to be able to flow a current equal to or higher than the holding current to the phase control element of the phase control dimmer by operating.

  The drive circuit is configured to detect an instantaneous voltage drop of the AC voltage input to the rectifier and operate the bypass circuit in accordance with the instantaneous voltage drop.

  According to the embodiment of the present invention, when the instantaneous voltage drop occurs in the AC voltage input to the rectifier, the instantaneous voltage drop is detected, and the drive circuit that operates the bypass circuit according to the instantaneous voltage drop is provided. When a current flows through the bypass circuit between the outputs of the rectifier of the AC-DC conversion circuit, a current larger than the holding current flows in the phase control element of the phase control dimmer, and the phase control element is turned off. Thus, it can be expected that the occurrence of problems such as flickering in the light emitting diode as the light source can be suppressed.

It is a schematic circuit diagram of the LED lighting circuit which shows Example 1 of this invention. Similarly, the alternating voltage waveform which shows instantaneous voltage drop is shown, (a) is a schematic input voltage waveform diagram of a phase control type dimmer, (b) is a schematic output voltage waveform diagram of a phase control type dimmer. Similarly, the input to the rectifier is shown, (a) is a schematic input voltage waveform diagram, (b) is an explanatory diagram conceptually showing the input current by the pseudo load and the bypass circuit. It is a schematic circuit diagram of the LED lighting circuit which shows Example 2 of this invention. It is a schematic block diagram of the illumination control system which shows Example 3 of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the LED lighting device 1 according to the embodiment of the present invention includes an AC-DC conversion circuit 2, a current adjustment circuit 3, a pseudo load 4, a bypass circuit 5, and a drive circuit 6. The input terminals 7a and 7b of the LED lighting device 1 are connected to a commercial AC power source Vs via a phase control dimmer 8, and the output terminals 9a and 9b are light emitting diodes 10 which are light sources connected in series. It is connected to the.

  The AC-DC conversion circuit 2 includes a rectifier 11 formed of a diode bridge and a smoothing capacitor C1. The input of the rectifier 11 is connected to the input terminals 7a and 7b of the LED lighting device 1 via the resistor R1 and receives the AC voltage output from the phase control dimmer 8. The output of the rectifier 11 is connected to the smoothing capacitor C1 via the backflow prevention diode D1. The AC-DC conversion circuit 2 converts the AC voltage output from the phase control dimmer 8 into a DC voltage and outputs it between both ends of the smoothing capacitor C1.

  The phase control dimmer 8 has its input terminals 8 a and 8 b connected to the commercial AC power supply Vs and the input terminal 7 a of the LED lighting device 1. The phase control dimmer 8 has a series circuit of a triac 13 as a phase control element, a variable resistor VR1 and a resistor R2 via a noise filter circuit 12 including an inductor L1 and a capacitor C2 at input terminals 8a and 8b. And are connected. A diac 14 is connected between the gate of the triac 13 and a connection point a1 of the variable resistor VR1 and the resistor R2, and a capacitor C3 is connected in parallel to the resistor R2. The noise filter circuit 12 suppresses noise generated when the triac 13 is turned on. The noise is also suppressed by the resistor R1 and the smoothing capacitor C1 of the AC-DC conversion circuit 2.

  The variable resistor VR1 is connected to a knob (not shown), and the resistance value is varied by turning the knob. As a result, the conduction timing of the triac 13 is varied, and the conduction angle of the AC voltage of the commercial AC power supply Vs is varied.

  The current adjustment circuit 3 is formed in a known step-down chopper circuit having a field effect transistor Q1, a diode D2, an inductor L2, and a capacitor C4. The both ends of the capacitor C4 are connected to the output terminals 9a and 9b of the LED lighting device 1.

  A voltage detection circuit 15 formed of a series circuit of a resistor R3 and a resistor R4 is provided in the previous stage of the current adjustment circuit 3. The voltage detection circuit 15 detects the voltage across the smoothing capacitor C <b> 1 of the AC-DC conversion circuit 2 and outputs it to the control circuit 16. A DC voltage corresponding to the AC voltage input to the rectifier 11 is generated between both ends of the smoothing capacitor C1. Therefore, the control circuit 16 performs on / off control of the field effect transistor Q1 in accordance with the AC voltage input to the rectifier 11.

  The current adjustment circuit 3 converts the DC voltage output from the AC-DC conversion circuit 2 into a DC voltage corresponding to the AC voltage input to the rectifier 11 by the field effect transistor Q1 being turned on / off by the control circuit 16. And output between both ends of the capacitor C4. Thereby, the electric current according to the alternating voltage input into the rectifier 11 is supplied to the light emitting diode 10 connected to the output terminals 9a and 9b of the LED lighting device 1. That is, the light emitting diode 10 is turned on at a dimming rate corresponding to the AC voltage output from the phase control dimmer 8.

  The pseudo load 4 has a series circuit of an N-type bipolar transistor Tr1 and a resistor R5 connected between the outputs of the rectifier 11, and a Zener diode ZD1 connected between the base and emitter of the transistor Tr1 via a resistor R5. Is formed. The base of the transistor Tr1 is connected to the positive electrode side of the smoothing capacitor C1.

  The transistor Tr1 is always turned on when an AC voltage is input to the rectifier 11 and a DC voltage is generated across the smoothing capacitor C4. As a result, a constant current flows through the series circuit of the transistor Tr1 and the resistor R5.

  Then, as shown in FIG. 3B, the current value of the constant current is such that the current Ib flowing to the input side of the rectifier 11 by the pseudo load 4 is more than the holding current of the triac 13 of the phase control dimmer 8. The resistance value of the resistor R5 and the like are set so as to increase by a small amount. That is, when the triac 13 is conducting, a current lower than the holding current flows through the triac 13 so that the triac 13 is not turned off. The current Ib is set to have a current value close to the holding current of the triac 13.

  In FIG. 3B, the current indicated by Ia is supplied to the variable resistor VR1, resistor R2, and AC-DC conversion circuit 2 of the phase control rectifier 8 before the triac 13 of the phase control dimmer 8 is turned on. Current limited by the resistor R1 and the like.

  In FIG. 1, the pseudo load 4 may be connected between the inputs of the rectifier 11. In other words, the pseudo load 4 only needs to be connected so that a current equal to or greater than the holding current can flow through the triac 13.

  The bypass circuit 5 includes a series circuit of an N-type bipolar transistor Tr2 and a resistor R6 as a switching element connected between the outputs of the rectifier 11, and a Zener diode ZD2 connected between the base and emitter of the transistor Tr2 via a resistor R6. It is formed.

  In the bypass circuit 5, when the transistor Tr2 is turned on, a constant current flows through the series circuit of the transistor Tr2 and the resistor R6. As shown in FIG. 3 (b), the constant current is such that a current Ic greater than or equal to the current Ib passed by the pseudo load 4 flows in the triac 13 of the phase control dimmer 8; ) The resistance value of the resistor R6 is set so that a current of Imax flows. The current Ic may be a current that is sufficiently larger than the current Ib passed through the triac 13 by the pseudo load 4. Thus, the bypass circuit 5 is formed so that a current equal to or higher than the holding current can flow through the triac 13 of the phase control dimmer 8.

  The drive circuit 6 controls on / off of the transistor Tr2 of the bypass circuit 5. The drive circuit 6 includes a series circuit of a resistor R7 and an N-type bipolar transistor Tr3 connected between the outputs of the rectifier 11, a series circuit of a resistor R8, a resistor R9, and a resistor R10 that are also connected between the outputs of the rectifier 11. A diode D3 connected between the base and emitter of the transistor Tr3, a resistor R11 connected between the base of the transistor Tr3 and the connection point a2 of the resistors R9 and R10, and a diode D4 connected in parallel to the resistor R8 And a capacitor C5 connected in parallel to the resistor R9. The connection point a3 between the resistor R7 and the collector of the transistor Tr3 is connected to the base of the transistor Tr2 in the bypass circuit 5.

  Since an AC voltage is input to the rectifier 11 of the AC-DC conversion circuit 2 and a full-wave rectified voltage is generated between the outputs of the rectifier 11, the base of the transistor Tr3 is routed through the path of the resistors R8, R9, and R11. Is supplied with current. Thereby, the transistor Tr3 is turned on. When the transistor Tr3 is turned on, the connection point a3 between the resistor R7 and the collector of the transistor Tr3 becomes the negative potential of the rectifier 11, and the transistor Tr2 of the bypass circuit 5 is turned off. No current flows through the bypass circuit 5.

  Further, since a full-wave rectified voltage is generated between the outputs of the rectifier 11, a current flows through the series circuit of the resistor R8, the resistor R9, and the resistor R10, and the capacitor C5 connected in parallel to the resistor R9 is charged. The

  When the AC voltage input to the rectifier 11 of the AC-DC conversion circuit 2 instantaneously drops, the full-wave rectified voltage output between the outputs of the rectifier 11 decreases instantaneously. At this time, the capacitor C5 connected in parallel to the resistor R9 constitutes a differential circuit with the resistor R10, and discharges in the path of the diode D4, the diode D1, the base of the transistor Tr1 of the pseudo load 4, the emitter, and the resistor R5. . As a result, the base potential of the transistor Tr3 rapidly decreases, and the transistor Tr3 is turned off. When the transistor Tr3 is turned off, a current is supplied to the base of the transistor Tr2 of the bypass circuit 5 through the resistor R7. As a result, the transistor Tr2 is turned on, and a current flows through the bypass circuit 5.

  When the AC voltage input to the rectifier 11 recovers from the instantaneous voltage drop, a full-wave rectified voltage is generated between the outputs of the rectifier 11, and a current flows through the series circuit of the resistors R8, R9, and R10. C4 is charged again, the transistor Tr3 is turned on, and the transistor Tr2 of the bypass circuit 5 is turned off. Here, the period during which the transistor Tr3 is OFF is set by the resistance values of the resistors R10 and R11 and the capacitance of the capacitor C4, and is set at least during the instantaneous voltage drop period. The diode D3 protects the transistor Tr3 from the reverse bias of the base.

  In this way, the drive circuit 6 detects the instantaneous voltage drop of the AC voltage input to the rectifier 11, turns on the transistor Tr2 of the bypass circuit 5 according to the instantaneous voltage drop, and activates the bypass circuit 5. It is formed as follows. The drive circuit 6 should just be formed so that the bypass circuit 5 can be operated when the commercial AC power supply Vs drops instantaneously.

  In addition to the LED lighting device 1 of the present embodiment, another electric device 17 may be connected to the commercial AC power source Vs via the phase controller 18. The electrical device 17 is, for example, a thermal device with relatively large power consumption. The phase controller 18 is configured to change the conduction angle of the AC voltage of the commercial AC power supply Vs and input the AC voltage to the electrical device 17.

  Then, when the phase control element 19 of the phase controller 18 is turned on, an input current (inrush current) flows instantaneously through the electric device 17, and as shown in FIG. 2A, the AC of the commercial AC power supply Vs The voltage may drop instantaneously. At this time, if the TRIAC 13 as the phase control element of the phase control dimmer 8 is conductive, the AC voltage with the variable conduction angle also decreases instantaneously as shown in FIG. is there.

  Next, the operation of the first embodiment of the present invention will be described.

  When the resistance value of the variable resistor VR1 of the phase control dimmer 8 is changed, the conduction angle of the AC voltage of the commercial AC power supply Vs is changed by the triac 13, and the AC voltage with the changed conduction angle is converted into the LED lighting device. 2 is input to the rectifier 11 of the AC-DC conversion circuit 2.

  The AC-DC conversion circuit 2 converts the AC voltage input to the rectifier 11 into a DC voltage and outputs it between both ends of the smoothing capacitor C1. The DC voltage is converted into a DC voltage corresponding to the AC voltage input to the rectifier 11 by the voltage detection circuit 15, the control circuit 16, and the current adjustment circuit 3, and applied to the light emitting diode 10. The light emitting diode is turned on when a current corresponding to the AC voltage input to the rectifier 11 flows, and emits visible light, for example, white light. In this way, the light emitting diode 10 is dimmed by changing the resistance value of the variable resistor VR1 of the phase control dimmer 8.

  Since the pseudo load 4 connected between the outputs of the rectifier 11 generates (outputs) a DC voltage across the smoothing capacitor C1 of the AC-DC conversion circuit 2, the transistor Tr1 is turned on and the current is Flowing. On the input side of the rectifier 11, that is, on the triac 13 of the phase control dimmer 8, a current Ib corresponding to the current flowing through the pseudo load 4 flows. This current Ib is equal to or higher than the holding current of the triac 13. As a result, when the triac 13 is conducting, it is possible to prevent the current less than the holding current from flowing through the triac 13.

  In the bypass circuit 5 connected between the outputs of the rectifier 11, when the transistor Tr3 of the drive circuit 6 is turned on, the transistor Tr2 is turned off and no current flows.

  When the triac 13 of the phase control dimmer 8 is conductive, if an instantaneous voltage drop occurs in the AC voltage of the commercial AC power supply Vs, the output voltage of the rectifier 11 drops instantaneously. A current corresponding to the output voltage from which the voltage of the rectifier 11 has dropped flows through the pseudo load 4. That is, a reduced current flows through the pseudo load 4 over the period of the instantaneous voltage drop.

  When the current flowing through the pseudo load 4 decreases, the current flowing through the input side of the rectifier 11, that is, the triac 13 of the phase control dimmer 8 also decreases. The current Ib that is passed through the triac 13 by the pseudo load 4 is set to a current that is somewhat larger than the holding current of the triac 13, so that if the current that flows through the triac 13 decreases, depending on the degree of the instantaneous voltage drop, the triac 13 The current flowing through 13 is lower than the holding current, and the triac 13 is turned off.

  In addition, during the instantaneous voltage drop, no current is supplied from the rectifier 11 to the series circuit of the resistors R8, R9, and R10 of the drive circuit 6. As a result, the capacitor C5 connected in parallel to the resistor R9 is discharged through the diode D4, thereby turning off the transistor Tr3. When the transistor Tr3 is turned off, the transistor Tr2 of the bypass circuit 5 is turned on, and a current flows through the bypass circuit 5. In the bypass circuit 5, a current corresponding to the output voltage from which the voltage of the rectifier 11 has dropped flows. However, the current is set to a relatively large current.

  A current Ic corresponding to the current flowing through the bypass circuit 5 flows through the input side of the rectifier 11, that is, the triac 13 of the phase control dimmer 8. This current Ic is equal to or greater than the holding current of the triac 13.

  In this way, even if an instantaneous voltage drop occurs in the commercial AC power supply Vs and no current exceeding the holding current flows through the triac 13 of the phase control dimmer 8 by the pseudo load 4, the triac 13 is connected to the triac 13 by the bypass circuit 5. A current greater than the holding current flows. As a result, even when an instantaneous voltage drop occurs in the commercial AC power supply Vs when the triac 13 is conducting, it is possible to prevent the current below the holding current from flowing through the triac 13.

  Note that since the capacitance of the smoothing capacitor C1 of the AC-DC conversion circuit 2 is relatively large, the voltage across the smoothing capacitor C1 does not rapidly decrease during the instantaneous voltage drop. Thereby, the light emitting diode 10 maintains lighting.

  According to the present embodiment, when an instantaneous voltage drop occurs in the AC voltage of the commercial AC power supply Vs, the instantaneous voltage drop is detected, and the transistor Tr2 of the bypass circuit 5 is turned on in response to the instantaneous voltage drop to bypass the circuit. 5 is provided, the current flows between the outputs of the rectifier 11 of the AC-DC conversion circuit 2 via the bypass circuit 5, so that the triac 13 of the phase control type dimmer 8 exceeds the holding current. This prevents the TRIAC 13 from being turned off, thereby suppressing the occurrence of problems such as flickering in the light emitting diode 10 as the light source.

  FIG. 4 is a schematic circuit diagram of an LED lighting circuit showing Embodiment 2 of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

  The LED lighting device 1A shown in FIG. 4 is obtained by configuring the pseudo load 4 and the bypass circuit 5 into one bypass circuit 5A in the LED lighting device 1 shown in FIG.

  The bypass circuit 5A is connected through a series circuit of an N-type bipolar transistor Tr4, a resistor R12 and a resistor R13 connected between the outputs of the rectifier 11, and a series circuit of a resistor R12 and a resistor R13 between the base and emitter of the transistor Tr4. Zener diode ZD3 and an N-type bipolar transistor Tr5 connected in parallel to resistor R13. Here, the combined resistance value of the resistor R12 and the resistor R13 is, for example, the resistance value of the resistor R5 shown in FIG. Further, the resistance value of the resistor R12 is, for example, the resistance value of the resistor R6 shown in FIG.

  The base of the transistor Tr4 is connected to the positive side of the smoothing capacitor C1 of the AC-DC conversion circuit 2, and the base of the transistor Tr5 is connected to the connection point a3 of the resistor R7 of the drive circuit 6 and the transistor Tr3. .

  When the AC voltage from the phase control dimmer 2 is input to the rectifier 11, the smoothing capacitor C <b> 1 is charged by the output voltage of the rectifier 11. That is, when the smoothing capacitor C1 outputs an output voltage from the rectifier 11, a DC voltage is generated between both ends thereof. The transistor Tr4 is turned on when the current from the smoothing capacitor C1 is supplied to its base. On the other hand, since the transistor Tr3 of the drive circuit 6 is turned on, the base of the transistor Tr5 is turned off with substantially the same potential as the emitter. Thereby, the bypass circuit 5A becomes a circuit of the pseudo load 4 shown in FIG. 1, and can pass a current Ib equal to or higher than the holding current to the input side of the rectifier 11, that is, to the triac 13 of the phase control dimmer 2.

  When an instantaneous voltage drop occurs in the commercial AC power supply Vs when the triac 13 of the phase control dimmer 2 is turned on, the transistor Tr3 of the drive circuit 6 is turned off. A current corresponding to the instantaneous voltage drop is supplied to the base of the transistor Tr5 from the positive output side of the rectifier 11 via the resistor R7 of the drive circuit 6. The transistor Tr5 is turned on, and both ends of the resistor R9 are short-circuited. Thereby, the bypass circuit 5A becomes a circuit of the bypass circuit 5 shown in FIG. 1 by connecting the series circuit of the transistor Tr4 and the resistor R13 between the outputs of the rectifier 11, and the input side of the rectifier 11, that is, the phase control type. A current Ic greater than the holding current can be passed through the triac 13 of the dimmer 2.

  According to the present embodiment, the bypass circuit 5A that allows a current to flow between the outputs of the rectifier 11 not only when the instantaneous voltage drop occurs in the AC voltage of the commercial AC power supply Vs but also when the instantaneous voltage drop occurs. Therefore, it is possible to prevent the triac 13 from flowing through the triac 13 of the phase control dimmer 8 and to turn off the triac 13, thereby causing problems such as flickering in the light emitting diode 10 as the light source. It has the effect that it can suppress.

  Further, since the bypass circuit 5A also serves as the pseudo load 4, the circuit configuration is simplified, and this has the effect that the LED lighting device 1A can be formed at low cost.

  FIG. 4 is a schematic block diagram of a lighting control system showing Embodiment 3 of the present invention. The illumination control system 20 includes the illumination device 21 and the phase control dimmer 8 shown in FIG.

  And the illuminating device 21 has the LED lighting device 1 shown in FIG. 1, the light emitting diode 10 as a light source, and the illuminating device main body 22, and is comprised. The light emitting diode 10 emits visible light such as white light. The illuminating device body 22 is formed by a known structure in which the LED lighting device 1 and the light emitting diode 10 are disposed.

  And the illuminating device 21 can be used as LED lamps, such as a LED bulb which has a nozzle | cap | die structure other than a general LED lighting fixture, and a lighting fixture which comprises this LED lamp.

  According to the illumination control system 20 and the illumination device 21 of the present embodiment, since the LED lighting device 1 shown in FIG. 1 is provided, the triac 13 (not shown) as the phase control element of the phase control dimmer 8 is provided. Even when an instantaneous voltage drop occurs in the commercial AC power supply Vs when conducting, it is suppressed that a current lower than the holding current flows in the triac 13 and the operation of the LED lighting device 1 is prevented from becoming unstable. Thus, there is an effect that it is possible to suppress the occurrence of problems such as flickering in the light emitting diode 10 as the light source.

  DESCRIPTION OF SYMBOLS 1,1A ... LED lighting device, 2 ... AC-DC conversion circuit, 3 ... Current adjustment circuit, 4 ... Pseudo load, 5,5A ... Bypass circuit, 6 ... Drive circuit, 8 ... Phase control type dimmer, 10 ... Light emitting diode, 11 ... Rectifier, 20 ... Lighting control system, 21 ... Lighting device, 22 ... Lighting device body, C1 ... Smoothing capacitor

Claims (4)

A rectifier for inputting an AC voltage from a phase control dimmer and a smoothing capacitor connected between the outputs of the rectifier. The AC voltage is converted into a DC voltage and output between both ends of the smoothing capacitor. An AC-DC conversion circuit;
A current adjusting circuit that converts the DC voltage output from the AD-DC conversion circuit into a DC voltage corresponding to the AC voltage input to the rectifier and supplies a current to the light emitting diode;
A bypass circuit connected between the outputs of the rectifier and configured to allow a current equal to or higher than a holding current to flow through a phase control element of the phase control dimmer;
A drive circuit that detects an instantaneous voltage drop of the AC voltage input to the rectifier and activates the bypass circuit according to the instantaneous voltage drop;
The LED lighting device characterized by comprising. A pseudo load connected between inputs or outputs of the rectifier so that a current equal to or higher than a holding current can flow through the phase control element of the phase control dimmer;
2. The LED according to claim 1, wherein the bypass circuit is formed such that a current greater than or equal to a current flowing by the pseudo load flows through a phase control element of the phase control dimmer. Lighting device. An LED lighting device according to claim 1 or 2;
A light emitting diode which is turned on by this LED lighting device;
A lighting device body in which the LED lighting device and the light emitting diode are disposed;
An illumination device comprising: A lighting device according to claim 3;
A phase control dimmer having a phase control element for changing the conduction angle of the AC voltage of the AC power source and outputting an AC voltage to the LED lighting device;
A lighting control system comprising:

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