JP2011014274A - Led lighting device, and led illuminating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device capable of reducing a cost, and capable of controlling a lighting state of a light emitting diode as a light source by a remote controller, and to provide an LED illuminating apparatus equipped with the LED lighting device.SOLUTION: This LED lighting device 1 includes an electric power source circuit 2 for supplying a current to the light emitting diode 8, a shut-off circuit 3 for shutting off the current supplied from the electric power source circuit 2, a signal processing circuit 4 for detecting a voltage between both ends of the light emitting diode 8, and for acquiring a control signal transmitted from the remote controller, based on the voltage between the both ends, and a control circuit 5 for controlling the shut-off circuit 3, in response to the control signal acquired by the signal processing circuit 4.

Description

The present invention relates to an LED lighting device that controls a lighting state of a light emitting diode by a radio signal transmitted from a remote control device, and an LED lighting device including the LED lighting device.

Conventionally, this type of LED lighting device includes a remote control receiving unit that receives a control signal (radio signal) transmitted from a remote control device. The remote control receiver is disposed so as to protrude outward from the instrument body in order to receive the control signal. For example, there has been proposed a luminaire including a cover portion with a remote control receiver disposed inside, and a collection member made of a molded part protruding outwardly attached to a cover portion facing the light receiving portion of the remote control receiver (patent) Reference 1).

In this conventional lighting apparatus, since the collecting member protrudes from the V cover in a convex shape, it becomes easy to receive a control signal transmitted from the remote control device, and the detection range of the remote control device is determined. Moreover, since the remote control receiving part is arrange | positioned in the position covered with the collection member and V cover as a cover part, it does not impair the external appearance of an instrument main body.

JP 2000-48636 A (page 3-4, FIG. 1)

However, the V cover to which the remote control receiving unit is attached is detachably attached to the center along the longitudinal direction in the instrument body, and lamps are arranged along both sides thereof. In other words, the remote controller receiving unit is limited in its arrangement position by the lamp arrangement. In addition, since the collecting member is formed on the convex portion, the luminaire having the remote control receiving portion has a drawback that it is difficult to reduce the cost due to its configuration.

An object of the present invention is to provide an LED lighting device that can reduce the cost and that controls a lighting state of a light-emitting diode as a light source by a remote control device, and an LED lighting device including the LED lighting device.

The invention of the LED lighting device according to claim 1 is a power supply circuit for supplying a current to the light emitting diode; and a voltage across the light emitting diode is detected, and a control signal transmitted from the remote control device is obtained from the voltage across the light emitting diode. And a control circuit for controlling the power supply circuit in accordance with the control signal acquired by the signal processing circuit.

In the present invention and each of the following inventions, each configuration is as follows unless otherwise specified.

There may be one or a plurality of light emitting diodes. In the case of a plurality, any of parallel connection, series connection, and series-parallel connection may be used.

The “voltage between both ends of the light emitting diode” may be a voltage between both electrodes of each light emitting diode, and is a voltage between the electrodes located at the most end side and the other end side of the light emitting diodes connected in series. It may be.

The signal processing circuit may detect the voltage across the light emitting diode when acquiring the control signal transmitted from the remote control device, or may always detect it.

According to the present invention, when a control signal is transmitted from the remote control device toward the light emitting diode, the voltage across the light emitting diode changes in accordance with the control signal. The signal processing circuit detects the voltage across the light emitting diode, analyzes the change in the detected voltage, and acquires the control signal transmitted from the remote control device. The control circuit controls the power supply circuit according to the control signal, and changes the current supplied from the power supply circuit to the light emitting diode. Thereby, the lighting state of the light emitting diode is controlled by the control signal transmitted from the remote control device.

According to a second aspect of the present invention, there is provided the LED lighting device according to the first aspect, further comprising: a cutoff circuit that cuts off a current supplied from the power supply circuit for a predetermined period. The voltage across the light emitting diode is detected during the predetermined period.

The predetermined period is a current pause period in which no current flows through the light emitting diode. The light emitting diode is turned off for a predetermined period. The predetermined period is set to a period during which it is difficult for the light-emitting diode to be seen and the control signal transmitted from the remote control device can be acquired. The predetermined period can be set to 1 to 300 milliseconds (mS), for example.

According to the present invention, a weak voltage corresponding to the control signal transmitted from the remote control device is generated between both ends of the light emitting diode for a predetermined period, and no large voltage is generated due to the current flowing. The weak voltage is easily detected by detecting the voltage across the diode.

The invention of the LED lighting device according to claim 3 is the invention of the LED lighting device according to claim 2, comprising a plurality of light emitting diodes, wherein the cutoff circuit sequentially cuts off currents flowing through the individual light emitting diodes, The individual light emitting diodes are sequentially turned off.

“Sequential cut-off” and “sequential turn-off” means that a plurality of light-emitting diodes are turned off by turning off the current in turn, and the light-emitting diodes preceding the light-emitting diodes turned off by turning off the current are turned off. Means that it is released and is lit. There may be one or a plurality of light emitting diodes that are sequentially shut off and extinguished.

According to the present invention, the signal processing circuit detects the voltage across the light emitting diodes that are sequentially turned off, and inputs the weak voltage generated across the light emitting diodes according to the control signal transmitted from the remote control device. The control signal is acquired based on the weak voltage. That is, the signal processing circuit continuously applies the voltage between both ends of each detected light-emitting diode even if the predetermined period during which each light-emitting diode is turned off is shorter than the transmission period per frame of the control signal transmitted from the remote control device. In combination, the control signal transmitted from the remote control device can be acquired.

According to a fourth aspect of the present invention, there is provided an LED lighting device comprising: the LED lighting device according to any one of the first to third aspects; a light emitting diode connected between outputs of a power supply circuit of the LED lighting device; And a remote control device that wirelessly transmits a control signal for changing the lighting state of the light emitting diode.

The LED lighting device may be disposed in the instrument main body or may be provided separately from the instrument main body.

“Lighting state of light emitting diode” means lighting, extinguishing and dimming of the light emitting diode.

According to the present invention, since the light emitting diode as the light source functions as a receiving element that receives a control signal transmitted from the remote control device, a lighting fixture that does not have a dedicated remote control receiving element is provided.

According to the first aspect of the present invention, since the light emitting diode as the light source has a function as a receiving element for receiving the control signal transmitted from the remote control device, the LED lighting device has a dedicated receiving element for receiving the control signal. It is not necessary to provide an LED lighting device that can reduce costs.

According to the second aspect of the present invention, the signal processing circuit detects the weak voltage according to the control signal transmitted from the remote control device generated between both ends of the light emitting diode during the predetermined period when the light emitting diode is turned off. A circuit configuration for removing a large voltage generated between both ends of the light emitting diode due to a current flowing through the diode is not required, and the circuit can be formed at a low cost with a simple configuration, thereby making the LED lighting device inexpensive. .

According to the invention of claim 3, the signal processing circuit has a predetermined period during which the individual light emitting diodes are extinguished by sequentially interrupting the currents flowing through the individual light emitting diodes and sequentially turning off the individual light emitting diodes. Even if the control signal transmitted from the remote control device is shorter than the transmission period per frame, the control signal transmitted from the remote control device is acquired, so that the predetermined period is shortened as much as possible so that the light-emitting diode cannot be turned off. be able to.

According to the fourth aspect of the present invention, the LED lighting device is provided, in which the light emitting diode as the light source functions as a receiving element for receiving the control signal transmitted from the remote control device, and the dedicated remote control receiving element can be omitted. Therefore, it is not necessary to design the arrangement of the remote control receiving element, and it is possible to provide an inexpensive LED lighting device as much as no remote control receiving element is provided.

The schematic circuit diagram of the LED lighting device which shows Example 1 of this invention. Similarly, a predetermined period during which the light emitting diodes are turned off is shown, (a) is an explanatory diagram of detection of a control signal from the remote control device, and (b) is an explanatory diagram of sequential turn-off of the light emitting diodes. The schematic perspective view of the LED lighting apparatus which shows Example 2 of this invention. Similarly, the partially cutaway schematic side view of the LED lighting device. Similarly, a light emitting diode is shown, (a) is a schematic sectional view of one light emitting diode, and (b) is a schematic front view of another light emitting diode.

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

In the present invention, the output current from the power supply circuit flowing through the light emitting diode as the light source is interrupted for a predetermined period by the interrupting circuit. As a result, no current flows through the light emitting diode over a predetermined period. At this time, when the light emitting diode receives a radio signal transmitted from the remote control device, a detectable voltage is generated across the light emitting diode.

The signal processing circuit analyzes and acquires the control signal transmitted from the remote control device from the voltage across the light emitting diode. The control circuit controls the power supply circuit according to the control signal. A current corresponding to the control signal transmitted from the remote control device flows through the light emitting diode. Thus, the light emitting diode functions as a light source and as a receiving element that receives a control signal transmitted from the remote control device.

1 and 2 show Embodiment 1 of the present invention, FIG. 1 is a schematic circuit diagram of an LED lighting device, FIG. 2 shows a predetermined period during which a light emitting diode is turned off, and (a) is a control signal from a remote control device. (B) is an explanatory view of the sequential turn-off of the light emitting diodes.

The LED lighting device 1 includes a DC power supply circuit 2 as a power supply circuit, a cutoff circuit 3, a signal processing circuit 4, and a control circuit 5. In the LED lighting device 1, the input terminals 6a and 6b are connected to the commercial AC power source Vs, and the output terminals 7a and 7b are connected to the light emitting diode 8 as a light source.

The DC power supply circuit 2 includes an AC-DC conversion circuit 9 and a DC-DC conversion circuit 10. The AC-DC conversion circuit 9 includes a rectifier 11 and a smoothing capacitor C1. The input side of the rectifier 11 is connected to the input terminals 6a and 6b of the LED lighting device 1 and is connected to the commercial AC power source Vs. A smoothing capacitor C <b> 1 is connected between the output terminals of the rectifier 11. The low potential side of the smoothing capacitor C1 is connected to the ground E via the capacitor C2. The AC-DC conversion circuit 9 converts the AC voltage of the commercial AC power supply Vs into a DC voltage and outputs it.

The DC-DC conversion circuit 10 includes an insulating transformer T1, a switching element Q1, a snubber circuit 12, and a rectifying / smoothing circuit 13. The insulation transformer T1 transforms and outputs the output voltage of the AC-DC conversion circuit 9 (voltage across the smoothing capacitor C1). A snubber circuit 12 is connected between both ends of the primary winding T1a of the insulating transformer T1. The snubber circuit 12 has a diode D1, a resistor R1, and a capacitor C3. The snubber circuit 12 regenerates the current flowing through the primary winding T1a of the isolation transformer T1 when the switching element Q1 is turned off.

The switching element Q1 is composed of a field effect transistor, is connected in series with the primary winding T1a of the isolation transformer T1, and is connected between the outputs of the AC-DC conversion circuit 9 (between both ends of the smoothing capacitor C1). . The gate (control terminal) of the switching element Q1 is connected to the control circuit 5.

The rectifying / smoothing circuit 13 is connected between both ends of the secondary winding T1b of the insulating transformer T1. The rectifying / smoothing circuit 13 includes a rectifying diode D2 and a smoothing capacitor C4, and rectifies and smoothes the voltage generated between both ends of the secondary winding T1b of the insulating transformer T1 into a DC voltage.

Thus, the DC-DC conversion circuit 10 converts the output voltage of the AC-DC conversion circuit 9 into a DC voltage by the on / off operation of the switching element Q1, and outputs it between the outputs of the rectifying and smoothing circuit 13. The DC voltage output between the outputs of the rectifying and smoothing circuit 13 changes according to the on / off frequency of the switching element Q1.

Both ends of the smoothing capacitor C4 between the outputs of the rectifying and smoothing circuit 13 are connected to the output terminals 7a and 7b of the LED lighting device 1. The light emitting diodes 8 connected in series are connected to the output terminals 7a and 7b with the anode side being the output terminal 7a side. The output voltage (DC voltage) of the DC-DC conversion circuit 10 is applied between both ends of the light emitting diode 8. As a result, the output current of the DC-DC conversion circuit 10 flows through the light emitting diode 8. That is, the DC power supply circuit 2 supplies current to the light emitting diode 8. The light emitting diode 8 is formed to emit visible light (for example, white light) used as illumination light.

The cutoff circuit 3 is composed of a plurality of switch elements Q2 such as field effect transistors connected in parallel to the individual light emitting diodes 8. The gate (control terminal) of each field effect transistor Q2 is connected to the control circuit 5. Then, for example, one field effect transistor Q2 is on-controlled by the control circuit 5 for a first predetermined period as a predetermined period, as shown in FIG. By this ON control, both ends of the light emitting diode 8 connecting the one field effect transistor Q2 in parallel are short-circuited.

Further, the on-control of the one field effect transistor Q2 is performed every second predetermined period (fixed period). As a result, the current supplied from the DC power supply circuit 2 to the light emitting diodes 8 connected in parallel with the one field effect transistor Q2 is supplied over the first predetermined period every second predetermined period. Blocked. No current flows through the light emitting diode 8 over the first predetermined period, and no voltage is generated between the both ends of the light emitting diode 8 due to the current flowing from the DC power supply circuit 2.

Further, for example, the plurality of field effect transistors Q2 are sequentially turned on by the control circuit 5 over a first predetermined period as shown in FIG. By this ON control, both ends of each light emitting diode 8 are sequentially short-circuited, and the current flowing through each light emitting diode 8 is sequentially cut off. As a result, the individual light emitting diodes 8 are sequentially turned off. Here, when the field effect transistor Q2 is sequentially turned on, the control circuit 5 turns off the field effect transistor Q2 before the field effect transistor Q2 that is turned on. That is, one field effect transistor Q2 of the plurality of field effect transistors Q2 is turned on, and one light emitting diode 8 of the plurality of light emitting diodes 8 is turned off.

In FIG. 1, the signal processing circuit 4 includes an amplifier circuit 14, a band pass filter circuit 15, a detection circuit 16, a waveform shaping circuit 17, and a microcomputer 18. The voltage between both ends of each light emitting diode 8 is detected via the amplifier circuit 14, the band pass filter circuit 15, the detection circuit 16, and the waveform shaping circuit 17, and is input to the microcomputer 18.

When a control signal (radio signal) is transmitted from the remote control device toward the light emitting diode 8, a voltage corresponding to the control signal is generated between both ends of each light emitting diode 8. That is, the remote control device transmits a control signal using an infrared light emitting diode. When the control signal transmitted from the infrared light-emitting diode is irradiated, the light-emitting diode 8 similar to the light-emitting diode of the remote control device responds to the control signal and, as shown in FIG. A voltage corresponding to the control signal is generated between the electrodes). This voltage is very weak compared to the power supply voltage. However, in the first predetermined period in which the field effect transistor Q2 of the cutoff circuit 3 is on-controlled, only the voltage is generated between both ends of the light emitting diode 8, so that it can be easily detected in the first predetermined period. .

The microcomputer 18 is configured to output a detection signal to the control circuit 5 when a voltage corresponding to the control signal transmitted from the remote control device is detected in the first predetermined period. Further, the microcomputer 18 is configured to calculate and analyze the voltage across the light emitting diode 8 during the first predetermined period, and acquire a control signal transmitted from the remote control device. When the microcomputer 18 acquires the control signal, the light emitting diode 8 functions as a receiving element that receives the control signal transmitted from the remote control device. Then, the control signal acquired by the microcomputer 18 is output to the control circuit 5.

As shown in FIG. 1, the control circuit 5 is connected to the gate (control terminal) of the switching element Q1 of the DC power supply circuit 2, and further connected to the gate (control terminal) of each field effect transistor Q2 of the cutoff circuit 3. ing. Then, as shown in FIG. 2 (a), the control circuit 5 performs the first predetermined period for each field effect transistor Q2 of the cutoff circuit 3 every second predetermined period, for example, 50 milliseconds (50 mS). For example, it is configured to be on-controlled for 1 millisecond (1 mS).

The second predetermined period excluding the first predetermined period is a period in which the current from the DC power supply circuit 2 flows to the light emitting diode 8, and the first predetermined period is a current pause period in which no current flows in the light emitting diode 8. is there. Since the first predetermined period is, for example, 1/50 of the second predetermined period, even if the first predetermined period is provided every second predetermined period, the change in the illumination light of the light-emitting diode 8 is changed. Very small and not visible.

When the signal processing circuit 4 detects a voltage corresponding to the control signal transmitted from the remote control device during the first predetermined period and outputs the detection signal of the voltage to the control circuit 5, the control circuit 5 The plurality of field effect transistors Q2 are sequentially turned on over a first predetermined period, and the individual light emitting diodes 8 are sequentially turned off. That is, the signal processing circuit 4 can detect a voltage corresponding to the control signal per frame transmitted from the remote control device based on the voltage across the light emitting diodes 8 that is sequentially turned off.

The control circuit 5 is configured to control the on / off frequency of the switching element Q1 of the DC power supply circuit 2 according to the control signal when the control signal obtained by analysis and acquisition by the microcomputer 18 is input from the signal processing circuit 4. ing. As a result, the output current of the DC power supply circuit 2 changes, and the current flowing through the light emitting diode 8 changes. That is, the light emitting diode 8 is turned on, turned off, or dimmed by a control signal transmitted from the remote control device.

In the DC power supply circuit 2, the DC-DC conversion circuit 10 is configured by using the insulating transformer T1 and one switching element Q1, but is not limited to this, and two or more such as a half bridge type These switching elements may be used as long as the output voltage of the DC power supply circuit 2 is converted into a predetermined DC voltage by the on / off operation of the switching elements and output.

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

When the commercial AC power supply Vs is turned on, the control circuit 5 operates, and the switching element Q1 of the DC power supply circuit 2 is on / off controlled at a predetermined on-duty and on-off frequency. As a result, a predetermined output current is supplied from the DC power supply circuit 2 to the light emitting diode 8. A predetermined output current flows through the light emitting diode 8, and all the lights are turned on to emit visible light (white light) as illumination light.

In addition, the control circuit 5 turns on one field-effect transistor Q2 of the cutoff circuit 3 every second predetermined period, for example, 50 milliseconds (50 mS) for the first predetermined period, for example, 1 millisecond (1 mS). . As a result, the light-emitting diode 8 connected in parallel to the one field effect transistor Q2 is turned off because the output current from the DC power supply circuit 2 does not flow for the first predetermined period. The signal processing circuit 4 detects the voltage across the light emitting diode 8 over the first predetermined period. Here, the first predetermined period is a very short period of 1 millisecond (1 mS), for example, and is very 1/50, for example, with respect to the second predetermined period (for example, 50 milliseconds (50 mS)). A small ratio. Therefore, even if the light emitting diode 8 is turned off for the first predetermined period, the change in the illumination light of the light emitting diode 8 is difficult to visually recognize.

And in order to switch the lighting state of the light emitting diode 8, the control signal (radio signal) which provided the switching information (control information) of the said lighting state from the remote control device is transmitted toward the light emitting diode 8 side. When each of the light emitting diodes 8 is irradiated with the control signal, a voltage corresponding to the control signal is generated between the electrodes. That is, a voltage is generated between both ends of each light emitting diode 8 according to the control signal transmitted from the remote control device. This voltage is a weak voltage or a minute voltage that hardly changes the illumination light radiated from the light emitting diode 8, and can be easily determined from the voltage across the light emitting diode 8 when the light emitting diode 8 is turned on. It cannot be detected. However, during the first predetermined period in which the light emitting diode 8 is turned off, only the weak voltage or the minute voltage is generated between the both ends of the light emitting diode 8, so that the voltage can be easily detected.

The control signal transmitted from the remote control device is transmitted as a radio signal having a modulation frequency of 38 kHz using infrared light having a wavelength of about 950 nm, for example. The control signal is formed in, for example, a leader code, a 16-bit custom code, an 8-bit data code, an 8-bit code obtained by inverting the 0/1, a stop bit, and a frame space format. One frame up to the frame space is 108 milliseconds (mS). During the transmission operation in the remote control device, the control signal is continuously transmitted from the remote control device.

Then, as shown in FIG. 2A, the signal processing circuit 4 detects the voltage in response to the control signal transmitted from the remote control device based on the voltage across the light emitting diode 8 during the first predetermined period. Then, a detection signal of the voltage is output to the control circuit 5.

The control circuit 5 sequentially turns on the plurality of field effect transistors Q2 of the cutoff circuit 3 over a first predetermined period. Here, the control circuit 5 turns on the field effect transistor Q2, and then turns off the field effect transistor Q2 in the previous stage after elapse of, for example, 0.01 to 0.001 milliseconds (mS).

The individual light-emitting diodes 8 are sequentially short-circuited for the first predetermined period and turned off by on / off control with respect to the field effect transistor Q2, and the light-emitting diodes 8 preceding the turned-off light-emitting diodes 8 are, for example, 0.01 Illuminates after ~ 0.001 milliseconds (mS).

The signal processing circuit 4 detects the voltage between both ends of each light emitting diode 8 that is sequentially turned off, and detects the voltage generated between both ends of the light emitting diode 8 in response to a control signal transmitted from the remote control device. Since the light-emitting diode 8 that is sequentially turned off and the light-emitting diode 8 in the preceding stage overlap, for example, between 0.01 and 0.001 milliseconds (mS), and the light-emitting period overlaps, the voltage corresponding to the control signal transmitted from the remote control device is Detect continuously.

One frame of the control signal transmitted from the remote control device is 108 milliseconds (mS), and the first predetermined period in which each light-emitting diode 8 is turned off is 1 millisecond (mS). When the individual light emitting diodes 8 are sequentially turned off 110 times or more, the voltage for one frame of the control signal transmitted from the remote control device is detected. The microcomputer 18 of the signal processing circuit 4 calculates and analyzes the detected voltage, and acquires control information of the control signal transmitted from the remote control device. This control information is output to the control circuit 5.

When the control information is input, the control circuit 5 stops sequentially turning on the plurality of field effect transistors Q2 of the cutoff circuit 3. Then, the control circuit 5 changes the on / off frequency of the switching element Q1 of the DC power supply circuit 2 in accordance with the control information. As a result, the output current of the DC power supply circuit 2 changes, and the lighting state of the light emitting diode 8 is switched. That is, the light-emitting diode 8 is turned off, turned on, or dimmed according to a control signal transmitted from the remote control device.

In the light-off state, a voltage across the light emitting diodes 8 is generated in all the light emitting diodes 8 that have received the control signal transmitted from the remote control device. Therefore, the voltage across the light emitting diodes 8 is always detected. Just keep it.

As described above, the light emitting diode 8 and the signal processing circuit 4 function as a remote control receiving unit that receives a control signal transmitted from the remote control device, and the light emitting diode 8 receives a control signal (receives light). Element). Therefore, it is not necessary to provide the LED illumination device with a dedicated remote control receiving element for receiving a control signal transmitted from the remote control device, and an arrangement design such as projecting the remote control receiving element from the instrument body can be eliminated. . Thereby, the LED lighting device 1 can reduce the cost of the LED lighting device including the light emitting diode 8.

Then, the blocking circuit 3 sequentially blocks the current flowing through the individual light-emitting diodes 8 over a first predetermined period, and turns off the individual light-emitting diodes 8 sequentially over the first predetermined period. 4 is the first predetermined period of each of the light-emitting diodes 8 sequentially detected even if the first predetermined period (for example, 1 mS) is shorter than the transmission period per frame (for example, 108 mS) of the control signal transmitted from the remote control device. The control signal transmitted from the remote control device can be acquired by continuously combining the voltages between both ends in the period. Therefore, it is possible to make the first predetermined period as short as possible so that the light-emitting diode 8 cannot be visually turned off during the first predetermined period. That is, the flickering of the illumination light of the light emitting diode 8 can be prevented.

Further, the signal processing circuit 4 detects a weak voltage corresponding to the control signal transmitted from the remote control device from the voltage across the light emitting diode 8 during the first predetermined period when the light emitting diode 8 is turned off. Therefore, there is no need for a circuit configuration for removing a large voltage generated between both ends of the light emitting diode 8 due to a current flowing when the light emitting diode 8 is lit. Therefore, the signal processing circuit 4 can be formed at a low cost with a simple configuration, and thus the LED lighting device 1 can be made inexpensive.

However, the signal processing circuit 4 only needs to be configured to detect the voltage across the light emitting diode 8 and acquire the control signal transmitted from the remote control device from the voltage across the light emitting diode 8. That is, the signal processing circuit 4 detects the voltage between both ends of the light emitting diode 8 when the light emitting diode 8 is lit, and is generated between both ends of the light emitting diode 8 due to the current flowing through the light emitting diode 8 from the voltage between both ends. It may be formed in a circuit configuration that removes a large voltage and detects a weak voltage according to a control signal transmitted from the remote control device. In this case, the LED lighting device 1 can remove the blocking circuit 3.

In the LED lighting device 1 shown in FIG. 1, the control circuit 5 controls the on-control of one field effect transistor Q2 of the cutoff circuit 3 for each first predetermined period for each first predetermined period. When 4 detects a voltage in response to a control signal transmitted from the remote control device based on the voltage across the light emitting diode 8 connected in parallel to the field effect transistor Q2, the individual light emitting diodes 8 are sequentially turned on. Control is performed to turn off the light over the first predetermined period. Here, the first predetermined period for controlling each of the one field effect transistor Q2 and each light emitting diode 8 may be equal to each other or may be set to different periods.

Further, the control circuit 5 does not control the individual light emitting diodes 8 to be sequentially turned off, and one or more light emitting diodes 8 are transmitted for one frame of a control signal transmitted from the remote control device (for example, 108 mS). The signal processing circuit 4 may be made to detect the voltage between both ends of the light emitting diode 8 by controlling to turn off the light. Further, the control circuit 5 may control the individual light-emitting diodes 8 so as to be extinguished sequentially over the first predetermined period without providing the preceding control.

Further, the one field effect transistor Q2 of the cutoff circuit 3 may be sequentially replaced every predetermined lighting time of the light emitting diode 8, for example, every 100 hours, without being fixed to one field effect transistor Q2.

The control signal transmitted from the remote control device uses infrared rays, but may be transmitted wirelessly using visible light. Even in this case, the signal processing circuit 4 can detect between both ends of the light emitting diode 8. Voltage is generated.

3 to 5 show a second embodiment of the present invention, FIG. 3 is a schematic perspective view of the LED lighting device, FIG. 4 is a partially cutaway schematic side view of the LED lighting device, FIG. 5 shows a light emitting diode, (A) is a schematic sectional drawing of one light emitting diode, (b) is a schematic front view of another light emitting diode. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The LED lighting device 19 shown in FIG. 3 includes a lighting fixture 20 and a remote control device 21. The lighting fixture 20 is a downlight embedded in a ceiling surface or the like, and a donut-shaped decorative frame 23 is provided on the lower end side of the substantially cylindrical fixture main body 22, and a translucent cover 24 is arranged on the decorative frame 23. It is installed. And the instrument main body 22 has attached a pair of attachment springs 25 and 25 for fixing the instrument main body 22 to a ceiling etc. on both right and left sides.

  Further, as shown in FIG. 4, the instrument body 22 is provided with an LED module 26 and a reflecting plate 27 in which the light emitting diodes 8 are arranged inside the lower end side. In addition, the LED lighting device 1 shown in FIG. A terminal block 29 for connecting a power cable and a ground wire (not shown) from the commercial AC power source Vs is disposed on the upper surface side of the instrument body 22.

  As shown in FIG. 5A, the LED module 26 has a plurality of light emitting diodes 8 mounted on a substrate 30 made of, for example, an aluminum (Al) plate. That is, an insulating layer 31 is formed on the surface of the substrate 30, and an LED bare chip 32 is soldered to a pad (not shown) provided on the surface of the insulating layer 31 with gold (Au) / tin (Sn) eutectic solder 33. Yes.

  In the LED bare chip 32, a light emitting layer 35 is formed on the surface of a sapphire 34 formed in a rectangular shape, and electrodes 36 and 37 are provided on the surface of the light emitting layer 35. The electrodes 36 and 37 are wire bonded to pads (not shown). The light emitting layer 35 is formed of, for example, a light emitting material that emits light in the ultraviolet to blue light region, for example, InGaN, and emits blue light when energized.

  The LED bare chip 32 is accommodated in a surrounding body 38 whose inner surface is formed on the surface of the insulating layer 31 of the substrate 30, and is injected into the inside of the surrounding body 38 to be solidified and solidified. Buried. The translucent resin 39 is made of, for example, a transparent silicone resin, and YAG phosphor particles 40 that convert blue light into predetermined light, for example, yellow light, are mixed therein.

  The light emitting diode 8 emits white light by mixing blue light emitted from the LED bare chip 32 and yellow light wavelength-converted by the YAG phosphor particles 40. As described in FIG. 1, the light emitting diodes 8 connected in series are connected to the output terminals 7 a and 7 b of the LED lighting device 1.

  When a control signal is transmitted from the remote control device 21 toward the light emitting diode 8, the control signal is, for example, light transmitted wirelessly at a modulation frequency of 38 kHz using infrared light having a wavelength of about 950 nm. The resin 39 passes through and acts on the electrodes 36 and 37 of the LED bare chip 32. A weak voltage or a minute voltage is generated between the electrodes 36 and 37 in response to the infrared control signal. When the weak voltage or the minute voltage is detected by the signal processing circuit 4 of the LED lighting device 1, the LED bare chip 32 (light emitting diode 8) receives (receives) the control signal transmitted from the remote control device 21. It functions as a (light receiving element).

  In FIG. 3, if a control signal is wirelessly transmitted from the remote control device 21 from the illumination area illuminated by the emitted light (illumination light) of the light emitting diode 8 toward the translucent cover 24 of the lighting fixture 20, the control signal is transmitted. The light emitting diode 8 can receive the signal. Therefore, the transmission operation of the remote control device 21 can be performed quickly. The remote control device 21 is formed with a known configuration so that a control signal for changing the lighting state of the light emitting diode 8 can be wirelessly transmitted.

  In the LED lighting device 19, the light emitting diode 8 as a light source functions as a receiving element that receives a control signal transmitted from the remote control device 21. Since the remote control receiving element is not provided, it can be provided at a low cost.

The LED module 26 may be provided with a light emitting diode 8A shown in FIG. The light emitting diode 8A is formed in one red light emitting portion 41a that emits red light, one green light emitting portion 41b that emits green light, and two blue light emitting portions 41c and 41c that emit blue light.

The remote control device 21 is formed so as to be able to transmit control signals that can control the light outputs of the red light emitting portion 41a, the green light emitting portion 41b, and the blue light emitting portions 41c and 41c of the light emitting diode 8A. Thereby, the LED illuminating device 19 which can change the light chromaticity of the illumination light radiate | emitted from the lighting fixture 20 as desired can be provided. Further, the light emitting diode 8 </ b> A easily responds to the infrared light control signal transmitted from the remote control device 21 by the red light emitting unit 41 a, and the function as a receiving element is improved.

INDUSTRIAL APPLICABILITY The present invention can be used for a home lighting fixture or a facility lighting fixture in which a light emitting diode is used as a light source and the lighting state of the light emitting diode is controlled by a remote control device.

DESCRIPTION OF SYMBOLS 1 ... LED lighting device, 2 ... DC power supply circuit as a power supply circuit, 3 ... Shut-off circuit, 4 ... Signal processing circuit, 5 ... Control circuit, 8, 8A ... Light emitting diode, 19 ... LED lighting device, 21 ... Remote control device, 22 ... Appliance body

Claims (4)

A power supply circuit for supplying a current to the light emitting diode; a signal processing circuit for detecting a voltage across the light emitting diode and obtaining a control signal transmitted from the remote control device from the voltage across the light emitting diode; And a control circuit for controlling the power supply circuit in response to the control signal. 2. A cutoff circuit that cuts off a current supplied by the power supply circuit for a predetermined period; and the signal processing circuit detects a voltage across the light emitting diode in the predetermined period. LED lighting device. 3. The LED lighting device according to claim 2, wherein a plurality of light emitting diodes are provided, and the blocking circuit sequentially blocks currents flowing through the individual light emitting diodes, and sequentially turns off the individual light emitting diodes. An LED lighting device according to any one of claims 1 to 3, a light emitting diode connected between outputs of a power circuit of the LED lighting device, a fixture main body in which the light emitting diode is disposed, A remote control device that wirelessly transmits a control signal for changing a lighting state; and an LED illumination device.

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