JP5473058B2 - Light emitting diode lighting device and light emitting diode lighting system - Google Patents

Description

  The present invention relates to a light-emitting diode illuminating device and a light-emitting diode illuminating system that can be dimmed using a dimmer for an incandescent bulb.

Hotel rooms, restaurants, living rooms, and the like are equipped with dimmers that can adjust the brightness of incandescent light bulbs according to their use. Incandescent bulb dimmers are widely used.
On the other hand, in recent years, energy-saving products that can efficiently use energy such as oil, electric power, and gas to save the consumption amount have been developed and studied in order to cope with environmental problems. In light bulbs, light-emitting diode illuminating devices (hereinafter, light-emitting diodes are abbreviated as LEDs) have been developed in place of incandescent light bulbs.

  However, the conventional dimmer for an incandescent bulb is a two-wire phase control type dimmer, and cannot dimm the LED lighting device. For this reason, there is provided an LED lamp dimming adapter device capable of smoothly dimming the LED lighting device using an incandescent bulb dimmer (Patent Document 1).

JP 2006-319172 A

The LED starts to flow current when the applied voltage reaches a certain voltage (forward voltage), and hardly flows current when the applied voltage is low. For this reason, when the applied voltage is low, no current flows through the circuit network of the dimming lamp for incandescent bulbs, and the dimming circuit does not function. Further, even if a certain amount of current flows through the circuit network, the circuit starts to operate, and a trigger pulse by phase control is applied to the gate of the main component, TRIAC (TRIAC, bidirectional thyristor), the interval between T _{2 and} T ₁ Therefore, the LED lighting device (LED lamp) could not be dimmed.
The LED lamp dimming adapter device of Patent Document 1 includes current holding means for supplying a holding current to a dimming device for an incandescent bulb. By attaching the adapter device in parallel to a lighting circuit composed of a dimmer and an LED load, the holding current of the triac of the dimmer can be passed.

  The current holding unit includes a constant current circuit that supplies a holding current to the triac of the dimmer, and a voltage detection circuit that detects the predetermined voltage and controls the constant current circuit. In the adapter device of Patent Document 1, the voltage detection circuit detects a voltage at which the LED load is lit and a sufficient triac holding current can flow. When the voltage cannot be detected, the constant current circuit is turned on to supply the holding current to the triac. Thereby, in the illumination system (LED lighting circuit) using the dimmer for the incandescent bulb, the dimming of the LED illumination device can be performed.

  However, the LED lamp dimming adapter device of Patent Document 1 needs to be newly attached to a lighting system that is dimmed by a conventional dimming device for incandescent bulbs. Expenses were incurred and an economic burden.

  The present invention provides a light-emitting diode illuminating device and a light-emitting diode illuminating system that enable dimming of an LED illuminating device in a lighting system that is dimmed by a conventional dimmer for an incandescent light bulb and that does not require installation work to the lighting system It is intended to provide.

The light-emitting diode illuminating device of the present invention is a light-emitting diode illuminating device that dimmes a light-emitting diode using a two-wire phase control dimmer, and the two-wire phase control in which a rectifier and a light-emitting diode load are connected in series. A holding current maintaining circuit for receiving a phase control voltage output from the dimmer and supplying a holding current to the dimmer, connected in parallel to the lighting circuit of the method dimmer, and a load current of the light emitting diode load The load current is limited to a constant current connected in series to the holding current limiting circuit for detecting the detection and interrupting the supply of the holding current of the holding current maintaining circuit and the lighting circuit of the two-wire phase control dimmer A switching element that reaches the on state upon receiving the phase control voltage in the holding current maintaining circuit, and adds the holding current that flows when the switching element is on to the load current. The circuit operation of the dimmer is maintained, and when the load current flowing through the constant current circuit reaches a holding current that can maintain the circuit operation of the dimmer, the holding current limiting circuit is a gate of the switching element of the holding current maintaining circuit. The voltage is lowered to turn off and the holding current added to the load current is cut off .
In the present invention, the constant current circuit of the light emitting diode lighting device and the holding current limiting circuit share a judgment resistor for detecting a load current of the light emitting diode load .

  The light-emitting diode illumination system of the present invention is a lighting system that performs dimming using a two-wire phase control dimmer. The light-emitting diode illumination device of the present invention is connected in series to a power line of the illumination system, A light emitting diode illuminating device and a light emitting diode illuminating device without a holding current maintaining circuit and a holding current limiting circuit of the light emitting diode illuminating device are connected in parallel.

The LED lighting device of the present invention supplies a holding current to a dimmer for an incandescent bulb. Thereby, the LED illumination apparatus can be dimmed using the illumination system using the conventional dimmer for incandescent bulbs as it is. Therefore, it is not necessary to install a new dimming device, and the installation cost required for dimming the LED lighting device can be reduced.
Further, by adding one LED lighting device of the present invention to a plurality of LED lighting devices used in a conventional lighting system, all the LED lighting devices can be dimmed smoothly. Thereby, it is not necessary to use a high-price dimmable LED lighting device for all LED lighting devices, and the cost required for purchasing the LED lighting device can be reduced.
On the other hand, since the LED lighting device of the present invention is a load current detection method, if the current that is the sum of the current flowing through the holding current maintaining circuit and the current flowing through the LED lighting device exceeds the holding current, the holding current is cut off regardless of the voltage. Therefore, since the holding current can be kept to a minimum even when the LED load increases, an energy-saving LED lighting device can be provided.

It is a figure showing the lighting circuit of the LED lighting apparatus of this invention. It is a wave form diagram showing the electric current at the time of light control of the LED lighting apparatus of this invention. It is a figure showing the LED lighting system which uses the LED lighting apparatus of this invention. It is a figure showing the example of a lighting circuit of the LED lighting apparatus non-corresponding to a dimmer. It is a figure showing the lighting circuit of the LED lighting apparatus of the illumination system of FIG.

  This invention implement | achieves dimming an LED lighting apparatus in the illumination system which uses the conventional dimmer for incandescent lamps.

The LED lighting device of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a lighting circuit of the LED lighting device of the present invention. FIG. 2 is a waveform diagram showing the current during dimming of the LED lighting device of the present invention. FIGS. 2A, 2B, and 2C show currents with conduction angles of 45 degrees, 80 degrees, and 135 degrees, respectively. (A), (b), (c) upper stage (channel CH1) represents a holding current waveform supplied to the dimmer by the holding current maintaining circuit, and the lower stage (channel CH2) represents the LED illumination device. Represents the voltage applied to the LED array. FIG. 3 is a diagram showing an LED lighting system using the LED lighting device of the present invention. FIG. 4 is a diagram illustrating an example of a lighting circuit of an LED lighting device that does not support a dimmer. FIG. 5 is a diagram illustrating a lighting circuit of the LED lighting device of the lighting system of FIG. 3.
The LED illumination device 10 of the present invention is an LED illumination device that can be dimmed by a two-wire phase control type dimmer 12 (FIGS. 3 and 5) that is a dimmer for an incandescent bulb. The LED lighting device 10 of the present invention is connected to the lighting circuit of the LED lighting system 16 in series with the AC power source 14 and the dimmer 12 (FIG. 5).

The lighting circuit of the LED lighting device 10 in FIG. 1 includes a rectifier D1, a holding current maintaining circuit 18, a constant current circuit 20, a holding current limiting circuit 22, and an LED load (LED array) 24. The holding current maintaining circuit 18 and the holding current limiting circuit 22 are connected in parallel to the lighting circuit in which the rectifier D1 and the LED load 24 are connected in series, and the constant current circuit 20 is connected in series.
The rectifier D <b> 1 is a full-wave rectification bridge diode that performs full-wave rectification on the phase control voltage output from the dimmer 12.

  The dimmer 12 can arbitrarily set the phase angle of the voltage of the AC power supply 14. The TRIAC (phase control element) 26 is operated at the set phase angle of the power supply voltage to control light control. The triac is connected to the AC power supply 14, and the triac 26 is turned on when a trigger signal is input to the gate, and operates while maintaining an on state while a certain holding current flows. When the holding current is gone, it turns off and stops operating. The phase control voltage output from the dimmer 12 is input to the rectifier D1 through the high frequency blocking filter (capacitor) C2. The output voltage of the rectifier D1 is converted into a full-wave rectified voltage, and the output of the lighting circuit of the LED lighting device 10 changes according to the conduction angle of the phase control voltage. The LED load of the LED lighting device 10 is dimmed according to the phase angle of the AC voltage phase-controlled by the dimmer 12.

The holding current maintaining circuit 18 includes a switching element (MOSFET) Q3, resistors R6 and R7, and a Zener diode ZD1. When the output voltage of the rectifier D1 reaches the ON condition of the switching element Q3, the drain of the switching element Q3 - holding current I ₁ flows source and the resistor R6. Load current a current obtained by adding the _{I 2} flowing through the holding current _{I 1} and the LED array 24 becomes holding current I of the triac 26 (FIG. 1, FIG. 2).
The resistor R7 is a resistor that turns on the switching element Q3, and the Zener diode ZD1 is for protecting the gate voltage of the switching element Q3. The resistor R8 is a resistor that sets the gate voltage of the switching element Q3.

The constant current circuit 20 includes a switching element (MOSFET) Q2, resistors R4 and R5, an NPN transistor Q1, and a capacitor C1. Load current _{I 2} the switching element Q2 of the LED load 24, the voltage across the resistor R4 which is generated when flowing through the resistor R4 reaches a predetermined voltage (0.6V), the collector of the NPN transistor Q1 - emitter There was one, the gate voltage of the switching element Q2 back down, the switching element Q2 is turned off, limiting the load current I ₂ to the constant current.
The resistor R5 is a resistor that turns on the switching element Q2.

The holding current limiting circuit 22 includes an NPN transistor Q4 and resistors R3, R4, and R9. When the voltage across the combined resistance of resistors R3, R4 which occurs when the load current _{I 2} of the LED load 24 flows through the resistors R3, R4 reaches a predetermined voltage (0.6V), the collector of the NPN transistor Q4 - emitter The interval turns on. Accordingly, the gate voltage of the switching element Q3 of the holding current maintaining circuit 18 withdraws, the switching element Q3 is turned off to cut off the holding current I _1.
The resistor 9 is a resistor that sets the base current of the NPN transistor Q4.

The resistor R4 is determined resistance to detect the LED load current I _2, and is available in two circuits of the constant current circuit 20 holds the current limiting circuit 22. Thereby, the current limiting resistance of the entire lighting circuit of the LED lighting device 10 can be reduced, and power consumption due to heat generation of the resistance can be suppressed, so that energy saving can be achieved.
Further, in the lighting circuit of the LED lighting device 10, the resistor R1 is a fuse chip resistor. The resistor R2 is a resistor that lights a guide lamp (neon tube in the wiring device). VZ1 is a lightning voltage protection element.

Next, the operation of the lighting circuit of the LED lighting device 10 will be described with reference to FIGS.
First, the case where the dimmer is operated to set the conduction angle to 45 degrees and the LED load is turned on with low illuminance will be described.
When the output voltage of the rectifier D1 reaches the ON state of the switching element Q3, the drain of the switching element Q3 - source and a resistor R6 holding current _{I 1} flows (FIG. 2 (a) CH1). On the other hand, the load current I ₂ flowing through the LED load 24 is small, and the triac 26 in the circuit of the dimmer 12 cannot be kept on only by the load current I ₂ flowing through the LED load 24.
However, since the holding current maintaining circuit 18 supplies the holding current I ₁ to the dimmer 12, the ON state of the triac 26 in the circuit of the dimmer 12 can be maintained, and the load current I is supplied to the LED load 24. ₂ can be supplied. Therefore, lighting with a low voltage is possible, and lighting with low illuminance is possible.
The effective value of the holding current I ₁ (FIG. 2 (a) CH1) at the conduction angle of 45 degrees is 5.95 V (P-P value 13.0 V), and the current I flowing through the lighting circuit of the LED lighting device (FIG. The effective value of 2 (a) CH2) was 51.7 V (PP value 160 V). When the resistance R6 is 1 kΩ, the heat loss PD generated for securing the holding current is PD = 5.95 mA × 51.7 Vrms = 0.37W.

When the conduction angle 80 degrees, approaches a state that can output voltage of the rectifier D1 to maintain the circuit operation of the dimmer 12 only the load current I ₂ flowing through the LED load 24. At this time, lighting with the illuminance at the intermediate point becomes possible.
Further, the load current _{I 2} flowing through the LED load 24 is the voltage across the combined resistance of resistors R3, R4 reaches 0.6V, the collector of the NPN transistor Q4 - emitter is turned on. Thus, the gate voltage of the switching element Q3 of the holding current maintaining circuit 18 withdraws, the holding current I ₁ flowing through the switching element Q3 is limited (FIG. 2 (b) CH1 time limit t _1), a wasteful energy consumption Can be suppressed.
Note that the effective value of the holding current I ₁ (FIG. 2 (b) CH1) at the conduction angle of 80 degrees is 9.19 V (PP value 12.6 V), and the current I flowing through the lighting circuit of the LED lighting device (see FIG. The effective value of 2 (b) CH2) was 76.7V (PP value 210V). When the resistance R6 is 1 kΩ, the heat loss PD generated for securing the holding current is PD = 9.19 mA × 76.7 Vrms = 0.70 W.

When the conduction angle is set to 135 degrees, the LED load is lit with high luminance. The load current I ₂ flowing through the LED load 24 becomes equal to or higher than the holding current of the dimmer 12, and a state where the circuit operation of the dimmer 12 can be maintained only by the load current I ₂ is reached.
At this time, the voltage across the combined resistance of the load current _{I 2} flows resistors R3, R4 of the LED load 24 reaches 0.6V, NPN transistor Q4 is turned on, the switching element Q3 of the holding current maintaining circuit 18 turned off, (interruption time _t 2 in FIG. 2 (c) CH1) since the holding current _{I 1} flowing through the switching element Q3 is interrupted, it is possible to provide an LED lighting device of energy conservation.
Note that the effective value of the holding current I ₁ (FIG. 2 (c) CH1) at the conduction angle of 135 degrees is 2.80 V (P-P value 13.0 V), and the current I flowing through the lighting circuit of the LED lighting device (FIG. The effective value of 2 (c) CH2) was 98.6V (PP value 142V). When the resistance R6 is 1 kΩ, the heat loss PD generated for securing the holding current is PD = 2.80 mA × 98.6 Vrms = 0.27 W.

The present invention is, to cut off the holding current I ₁ regardless of the voltage flows to the LED illumination device 10 or the holding current of the triac 26 for a load current detection method. Therefore, even if the load of the LED lighting device is increased, the holding current is kept to a minimum, so that the energy saving effect is great. In the present invention, as described above, the power consumption is only 0.37 W at the minimum dimming value (low illuminance), 0.70 W at the middle point illuminance, and 0.27 W at the maximum value (high luminance illuminance). .
Further, when the adjusting means (knob) of the dimmer 12 was minimized, only 0.26 W of power was consumed. On the other hand, in the LED lighting device for dimmers currently on the market, even when the knob of the dimmer 12 is minimized, a current of about 40 mA flows to secure a holding current, and a power of less than 1 W is consumed. It was.

Next, an embodiment of an LED illumination system using the LED illumination device of the present invention will be described with reference to FIGS.
FIG. 3 shows an LED lighting system 16 in which a plurality of LED lighting devices, that is, the LED lighting device 10 and the LED lighting device 30 are connected in series to a power line 28. Moreover, each LED lighting apparatus is in the state connected in parallel, respectively.
The LED lighting device 30 is an LED lighting device that does not support the so-called dimmer, and does not have the holding current maintaining circuit 18 and the holding current limiting circuit 22 of the LED lighting device 10 (FIG. 4). Therefore, when only the LED lighting device 30 is used for the LED lighting system 16, the holding current cannot be secured, so that the light cannot be adjusted. The LED lighting device 30 in FIG. 4 is obtained by connecting a rectifier D1, an LED load 24, and a constant current circuit 20 in series. The rectifier D1, the LED load 24, and the constant current circuit 20 are the same as the components in FIG.
The LED lighting device 10 and the LED lighting device 30 in FIG. 3 are bulb-type LED lighting devices, but are not limited to this, and are not limited to a straight tube or a circular fluorescent lamp type LED lighting or an embedded downlight. Or a spotlight-shaped LED illumination device.

  In the lighting circuit of the LED lighting system 16 in FIG. 5, when a voltage is output from the rectifier D <b> 1, a holding current is supplied to the dimmer 12 by the holding current maintaining circuit 18 of the LED lighting device 10. Since the holding current can be secured by the LED lighting device 10, a load current flows also to the LED lighting device 30. Therefore, by using one LED illumination device 10 in the LED illumination system 16, it is possible to dim a plurality of LED illumination devices not compatible with the dimmer.

In LED lighting devices that employ a switching power supply for LED lighting circuits that are currently on the market for dimmers, when dimming multiple LED lighting devices with one dimmer, all LED lighting devices It is necessary to pass a holding current. However, if the LED lighting device 10 of the present invention and the LED lighting device 30 that does not support the dimmer are used together, all the LED lighting devices can be dimmed with one dimmer. In addition, it is not necessary to pass a holding current to all LED lighting devices, and an LED lighting system having a large energy saving effect can be provided.
Furthermore, the LED lighting system 16 is a simple operation that simply replaces the incandescent light bulb of the lighting system for dimming the conventional incandescent light bulb with the LED lighting device 10 of the present invention and the LED lighting device 30 that does not support the dimmer. Can be completed.

  In the present specification, the incandescent light bulb used in combination with the dimmer in an existing building has been mainly described as being replaced with a light bulb type LED illumination device. However, the light emitting diode illumination device and the light emitting diode illumination of the present invention are described. The system is not limited to the bulb-type LED lighting device, and any shape LED lighting device that can be replaced with a straight tube type / annular fluorescent lamp or a downlight lamp can be dimmed.

DESCRIPTION OF SYMBOLS 10 LED lighting device 12 Dimmer 16 LED lighting system 18 Holding current maintenance circuit 22 Holding current limiting circuit 28 Power supply line 30 LED lighting device not corresponding to dimmer

Claims (3)

A light-emitting diode illuminating device for dimming a light-emitting diode using a two-wire phase control dimmer ,
A rectifier and a light emitting diode load connected in series to the lighting circuit of the two-wire phase control dimmer, which is connected in parallel, receives a phase control voltage output from the dimmer and holds a current in the dimmer A holding current maintaining circuit for supplying a current, a holding current limiting circuit for detecting a load current of a light emitting diode load and cutting off the supply of the holding current of the holding current maintaining circuit ;
A constant current circuit that is connected in series to the lighting circuit of the two-wire phase control dimmer, and that limits the load current to a constant current;
The holding current maintaining circuit is provided with a switching element that receives the phase control voltage and reaches the on state, and the holding current that flows when the switching element is on is added to the load current to maintain the circuit operation of the dimmer. When the load current flowing through the circuit reaches a holding current that can maintain the circuit operation of the dimmer, the holding current limiting circuit lowers the gate voltage of the switching element of the holding current maintaining circuit to turn it off and adds it to the load current A light-emitting diode illuminating device that cuts off a holding current . 2. The light-emitting diode illuminating device according to claim 1, wherein the constant current circuit and the holding current limiting circuit of the light-emitting diode illuminating device share a judgment resistor for detecting a load current of the light-emitting diode load . In an illumination system that performs dimming using a two-wire phase control type dimmer, the light emitting diode illumination device according to claim 1 or 2 is connected in series to a power supply line of the illumination system, and the light emitting diode illumination A light emitting diode illumination system comprising: a light emitting diode illumination device having no holding current maintaining circuit and no holding current limiting circuit for the light emitting diode illumination device;

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