JPH08102369A - Illumination control device - Google Patents

Abstract

PURPOSE: To improve the property of separating a voltage supplied to a lighting system from a control signal superimposed on the voltage. CONSTITUTION: The output stage of a control device 1 having a general DC power supply 6 is connected via a DC power output line 3 to the input stage of a lighting system 2 having an inverter lighting circuit 10. A transmission circuit 8 which superimposes a control signal on a DC voltage output to the DC power output line 3 is provided on the side of the control device 1, and a reception circuit 11 which demodulates the control signal superimposed on the DC voltage is provided on the side of the lighting system 2. Therefore, the property of separating the DC voltage, i.e., the voltage supplied to the lighting system 2, from the control signal superimposed on the voltage is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting control device for transmitting a control signal to a lighting device to remotely control a lighting load.

[0002]

2. Description of the Related Art Conventionally, a lighting control device for transmitting a control signal to a lighting device to remotely control a lighting load has been widely used. As a conventional example of this type of device, an example of a device that transmits a dimming signal to a lighting device is shown in FIG. This lighting control device supplies an AC power supply voltage from the control device 101 to the lighting load 103 of the lighting device 102. At this time, the sensor 104 detects the lighting state of the lighting load 103, and turns off the thyristor 106 functioning as a switch element for a very short time under the control of the microcomputer 105. This allows
A part of the waveform of the power supply voltage is cut and transmitted to the lighting device 102 as binarized code data. Then, in the lighting device 102, the microcomputer 107 decodes the code data and controls the inverter lighting circuit 108 according to the decoding result. Thus, the inverter lighting circuit 1
The lighting load 103 connected to 08 is remotely controlled.

FIG. 10 shows another conventional example of a lighting control device for transmitting a dimming signal to a lighting device. This device also
An AC power supply voltage is supplied from the control device 111 to the lighting load 113 of the lighting device 112. At this time, the microcomputer 115 generates a control signal in accordance with the signal from the sensor 114, and the control signal is superimposed on the power supply voltage output from the control device 111 as a high frequency signal. Then, the lighting device 112
Then, the LC filter 116 by the coupling transformer demodulates and detects the power supply voltage and the control signal, inputs the power supply voltage to the inverter lighting circuit 117, and inputs the control signal to the microcomputer 118. The control signal is input as a control signal to the inverter lighting circuit 117 via the microcomputer 118, and the lighting load 113 connected to the inverter lighting circuit 117 is remotely controlled.

[0004]

The apparatus shown in FIG. 9 has a drawback that the transmission to the lighting load 103 is not stable when the distortion of the power supply voltage is large because the phase control of the power supply voltage is performed.

The device shown in FIG. 10 has a drawback that noise carried on an AC power supply voltage interferes with a control signal superimposed on this power supply voltage, and high-precision control cannot be performed. In order to prevent the interference of noise with the control signal, special noise countermeasures are required, and the device becomes complicated.

Further, since the power supply voltage of any of the devices is an alternating current, when a harmonic suppression circuit such as a step-up chopper is provided, it must be provided on the lighting device 102, 112 side. Therefore, when a plurality of lighting devices 102, 112 are connected to the control devices 101, 111, each lighting device 10
It is uneconomical because a harmonic suppression circuit is required for every 2,112.

[0007]

According to a first aspect of the present invention, there is provided a controller having a collective DC power source connected to an AC power source line, a DC power source output line connected to an output stage of the collective DC power source, and this DC source. A lighting device having an inverter lighting circuit connected to the power supply connection line is provided, and a transmission circuit that superimposes a control signal on the DC voltage output to the DC power supply output line is provided on the control device side, and the control superimposed on the DC voltage is performed. A receiving circuit for demodulating a signal is provided on the lighting device side.

According to the second aspect of the invention, the lighting device is a CR in which a capacitor connected to the input stage of the inverter lighting circuit and a resistor connected to the input stage of the receiving circuit are connected in series.
A filter is provided.

In the third aspect of the invention, the control signal superimposed on the DC voltage is the dimming signal.

According to another aspect of the present invention, the control signal superimposed on the DC voltage is a signal obtained by AM-modulating a carrier wave in a frequency region below the lighting frequency of the inverter lighting circuit.

According to the fifth aspect of the invention, the harmonic suppressing circuit is provided in the collective DC power supply.

According to the invention of claim 6, a plurality of lighting devices are provided.

[0013]

According to the invention described in claim 1, a DC voltage for driving the lighting device is output from the collective DC power source to the DC power source output line through the inverter lighting circuit, and a control signal is transmitted to the DC voltage by the transmission circuit. It is superimposed. The control signal and the DC voltage are demodulated by the receiving circuit on the lighting device side.
At this time, since the control signal is demodulated from the DC voltage, the control signal has good separability, and the illumination device can be controlled with high accuracy.

In the second aspect of the invention, the DC voltage and the control signal are demodulated by the CR filter. That is, the DC voltage is cut by the capacitor, and the control voltage is extracted from the control signal by the resistor. As a result, the control signal can be easily demodulated from the DC voltage with a simple structure.

According to the third aspect of the present invention, the dimming control of the lighting device is accurately performed by remote control.

According to the invention described in claim 4, the harmonic component of the lighting frequency does not affect the modulated carrier wave of the control signal, and the transmission error is drastically reduced.

According to the fifth aspect of the present invention, distortion of the input current to the control device is suppressed by the harmonic suppression circuit, and measures against harmonic regulation are taken. In this case, since the harmonic suppression circuit is provided in the control device, when a plurality of lighting devices are provided as in the invention according to claim 6, it is not necessary to provide a harmonic suppression circuit in each lighting device. , You can build a system economically.

According to the sixth aspect of the invention, each lighting device is collectively and accurately controlled.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. The present embodiment is an illumination control device that can perform dimming control. As shown in FIG. 1, this device has a system configuration in which an output stage of one control device 1 and an input stage of a plurality of lighting devices 2 are connected via a DC power supply output line 3. The control device 1 includes a harmonic suppression circuit 4 and a collective DC power source 6 connected to an AC power source 5.
And a transmission circuit 8 to which the detection output from the sensor 7 is input. The lighting device 2 has an inverter lighting circuit 10 and a receiving circuit 11 to which a lighting load 9 is connected.

The details of the control device 1 are shown in FIG. The collective DC power supply 6 includes a full-wave rectification circuit 12 that full-wave rectifies the AC voltage from the AC power supply 5 into DC, and the harmonic suppression circuit 4 connected to its output stage. The harmonic suppression circuit 4 is a step-up chopper and includes a step-up transformer 13
, A switching transistor 14, a rectifying diode 15, and a smoothing output capacitor 16. To such a harmonic suppression circuit 4, a chopper control circuit 17 for controlling the switching operation of the transistor 14 and maintaining the output voltage generated across the capacitor 16 at a predetermined constant voltage is connected. The chopper control circuit 17 is, for example, SG3561 manufactured by Silicon General Co.
C is used. The output stage of the harmonic suppression circuit 4 is connected to the DC power supply output line 3.

Further, the transmission circuit 8 uses a PWM signal (PWM: Pulse) as a control signal, in this embodiment, a dimming signal.
Width Modulation) is output, and is configured by a dimming signal generation unit 18, which is connected to the sensor 7, a modulation unit 19, and a signal output unit 20. As shown in FIG. 4, the dimming signal generation unit 18 generates a PWM signal as illustrated in FIG. 4A according to the output of the sensor 7, and the modulation unit 19 outputs the PWM signal. 4 (b), high-frequency modulation is performed, and the signal output unit 20 outputs the modulated PWM signal as an AM modulation signal. Then, P output as an AM modulated signal in this way
The WM signal is input to the DC power supply output line 3, and is superimposed on the DC voltage generated by the collective DC power supply 6. A coil 21 functioning as an impedance upper is provided on the DC power supply output line 3 so that the PWM signal input to the DC power supply output line 3 does not flow to the collective DC power supply 6 side.

Next, details of the illuminating device 2 are shown in FIG. The lighting device 2 includes the inverter lighting circuit 10 having an input stage connected to the DC power output line 3, and the receiving circuit 11. The receiving circuit 11 is composed of a CR filter 23, an amplifying circuit 24, and a demodulating circuit 25. The coil 22 interposed in the input stage of the inverter lighting circuit 10 functions as an impedance upper for the PWM signal superimposed on the DC voltage output to the DC power supply output line 3, and the PWM signal lights the inverter. Preventing it from flowing into the circuit 10. CR
The filter 23 extracts only the PWM signal, which is an AC element, from the DC voltage by the capacitor C, and uses the PWM signal as a voltage signal by the resistor R. Then, the PWM signal thus converted into a voltage signal is amplified by the amplifier circuit 24, demodulated by the demodulation circuit 25, and input to the inverter lighting circuit 10.

In such a configuration, in the control device 1, the AC voltage is full-wave rectified by the full-wave rectification circuit 12 and converted into a DC voltage, which is converted into a constant voltage by the harmonic suppression circuit 4, and the DC power supply output line 3 Is output as a DC voltage. Then, when this DC voltage is input to the inverter lighting circuit 10 of the lighting device 2, an AC voltage is generated by the continuous switching action of the inverter lighting circuit 10,
The lighting load 9 is driven and lights up.

The lighting state of the lighting load 9 is monitored by the sensor 7 of the control device 1, and the dimming signal is generated by the transmission circuit 8 according to the output of the sensor 7. That is, the PWM signal as illustrated in FIG. 4 is generated. The PWM signal generated in this way is input to the DC power supply output line 3 as an AM modulation signal, superimposed on the DC voltage for driving the lighting load 9, and conveyed to the lighting device 2. In the lighting device 2, the conveyed PWM signal is taken out by the CR filter 23, amplified by the amplifier circuit 24, demodulated by the demodulation circuit 25, and supplied to the inverter lighting circuit 10. As a result, the inverter lighting circuit 10 controls the light emitting state of the lighting load 9.

Here, a DC voltage on which the PWM signal is superimposed is applied to the lighting device 2. Therefore, it is extremely easy to separate the DC voltage and the PWM signal, and the certainty thereof is high. Therefore, the PWM signal can be reliably demodulated from the DC voltage with a device having a simple structure, and the lighting load 9 can be controlled with high accuracy. Further, distortion of the input current is suppressed by the harmonic suppression circuit 4 provided in the control device 1, and measures against harmonic regulation are taken. Therefore, it is not necessary to provide such a harmonic suppression circuit 4 in each of the lighting devices 2, and the system can be constructed inexpensively and in a small size.

In the implementation, the signal input to the transmission circuit 8 does not need to be a monitoring signal of the lighting state of the lighting load 9, and may be, for example, a dimming signal of the lighting load 9 by an artificial operation or a dimming signal. It may be a control signal other than the optical signal.
This enables remote control of the lighting load 9.

FIG. 5 shows a modification of this embodiment.
FIG. 5 shows a DC voltage level control signal. In practice, the dimming signal generation unit 18 may have a structure that generates a dimming signal that is a control signal of such a DC voltage level. FIG. 5A is a DC voltage level control signal such that the control of the dimming rate of 50% is executed when the voltage level V ₁ is low and the detection is performed by the receiving circuit 11, and FIG.
Is a DC voltage level control signal such that the control of the dimming rate of 20% is executed when the voltage level V ₂ is high and is detected by the receiving circuit 11.

A second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals, and the description is omitted (the same applies hereinafter). In this embodiment, the lighting device 2
It is an example regarding. That is, in the device of the present embodiment, the coil 22 functioning as an impedance upper connected to the input stage of the inverter lighting circuit 10 is not provided, and the capacitor C connected to the input stage of the inverter lighting circuit 10 and the receiving circuit. There is provided a CR filter 31 in which a resistor R connected to 11 input stages is connected in series.

In such a configuration, the DC voltage is applied to the capacitor C, and the PWM signal as the control signal is applied to the resistor R. As a result, only the DC voltage is input to the inverter lighting circuit 10 as the drive voltage of the lighting load 9, and the PWM
The signal is taken out as a voltage signal by the resistor R, and the PWM signal is demodulated from the DC voltage. At this time, the inverter lighting circuit 10 is supplied with power from both ends of the capacitor C.

Further, according to the present embodiment, the coil connected to the input stage of the inverter lighting circuit 10 and functioning as an impedance upper can be omitted, and the circuit structure can be extremely simplified.

A third embodiment of the present invention will be described with reference to FIGS. 7 and 8. In this embodiment, the carrier frequency of the PWM signal generated by the transmission circuit 8 of the control device 1 is lowered to 40 kHz or less. As shown in FIG. 7, the PWM signal generated by the dimming signal generation unit 18 illustrated in FIG. 7A is different from the PWM signal illustrated in FIG.
A modulation signal of kHz or less is generated by the modulator 19. As a result, the superimposed signal with respect to the DC voltage becomes a signal as illustrated in FIG.

Therefore, on the side of the illumination device 2 as well, in the receiving circuit 11, the low-pass filter 41 is connected between the CR filter 23 and the amplifying circuit 24 to cut off high-frequency noise and to amplify only the low-frequency component. It is configured to be input to 24.

In such a structure, a carrier of 125 kHz is usually used for AM modulation. On the other hand, as the lighting frequency of the inverter lighting circuit 10, a frequency between 40 and 100 kHz is generally used in order to prevent interference with the infrared remote controller. Therefore, in the case of a carrier wave of 125 kHz, the third harmonic of the inverter lighting circuit 10 affects the AM-modulated carrier wave and causes a transmission error. On the other hand, in the present embodiment, the carrier frequency of the PWM signal is set to 40 kHz or less, for example, 10 kHz, and the low pass filter 41 on the side of the lighting device 2 generates a harmonic that is affected by the harmonic component of the inverter lighting circuit 10. It is cut and this is taken out as a dimming signal. Therefore, the transmission error of the dimming signal can be drastically reduced.

[0034]

According to the first aspect of the present invention, there is provided a controller having a collective DC power supply connected to an AC power supply line, a DC power supply output line connected to an output stage of the collective DC power supply, and the DC power supply connection line. A lighting device having a connected inverter lighting circuit is provided, and a transmission circuit that superimposes a control signal on the DC voltage output to the DC power supply output line is provided on the control device side to demodulate the control signal superimposed on the DC voltage. Since the receiving circuit is provided on the lighting device side, the control signal can be surely demodulated from the DC voltage, and thus the lighting device can be controlled with high accuracy.

According to the second aspect of the present invention, the lighting device is provided with the CR filter in which the capacitor connected to the input stage of the inverter lighting circuit and the resistor connected to the input stage of the receiving circuit are connected in series. The control signal can be surely demodulated from the DC voltage by the CR filter with a simple structure.
Therefore, the device can be simplified.

According to the third aspect of the present invention, since the control signal superimposed on the DC voltage is the dimming signal, accurate dimming control can be realized by remote control.

According to the fourth aspect of the present invention, the control signal superimposed on the DC voltage is a signal obtained by AM-modulating a carrier wave in a frequency region below the lighting frequency of the inverter lighting circuit.
The influence of the harmonic component of the lighting frequency on the modulated carrier wave of the control signal can be eliminated, and therefore the transmission error of the control signal can be drastically reduced.

According to the fifth aspect of the invention, since the harmonic suppressing circuit is provided in the collective DC power source, it is possible to take measures against the harmonic regulation. In this case, the harmonic suppressing circuit is provided in the control device. Therefore, when a plurality of lighting devices are provided as in the invention described in claim 6, it is not necessary to provide a harmonic suppression circuit in each lighting device, and the system can be economically constructed.

According to the sixth aspect of the invention, since a plurality of lighting devices are provided, each lighting device can be collectively controlled with high accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of an entire illumination control device as a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a control device.

FIG. 3 is a circuit diagram showing a configuration of a lighting device.

FIG. 4 is a waveform diagram illustrating a dimming signal output from a transmission circuit.

FIG. 5 is a waveform diagram illustrating a dimming signal output from a transmission circuit as a modification of the first embodiment.

FIG. 6 is a circuit diagram of a lighting device showing a second embodiment of the present invention.

FIG. 7 is a waveform diagram illustrating a dimming signal output from a transmission circuit as a third embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a lighting device.

FIG. 9 is a block diagram showing a configuration of a lighting control device as a conventional example.

FIG. 10 is a block diagram showing a configuration of a lighting control device as another example of the related art.

[Explanation of symbols]

 1 Control Device 2 Lighting Device 3 DC Power Supply Output Line 5 AC Power Supply 6 Collective DC Power Supply 8 Transmitter Circuit 10 Inverter Lighting Circuit 11 Receiver Circuit 31 CR Filter C Capacitor R Resistance

Claims (6)

[Claims] 1. A controller having a collective DC power supply connected to an AC power supply line, a DC power supply output line connected to an output stage of the collective DC power supply, and an inverter lighting circuit connected to the DC power supply connection line. A lighting device that has, a transmission circuit that is provided on the control device side, and that superimposes a control signal on a DC voltage that is output to the DC power supply output line, and a control signal that is provided on the lighting device side and that is superimposed on the DC voltage. And a receiving circuit for demodulating the light. 2. The lighting device has a CR filter in which a capacitor connected to an input stage of an inverter lighting circuit and a resistor connected to an input stage of a receiving circuit are connected in series. Lighting control device. 3. The lighting control device according to claim 1, wherein the control signal superimposed on the DC voltage is a dimming signal. 4. The control signal to be superimposed on the DC voltage is a signal obtained by AM-modulating a carrier wave in a frequency region lower than the lighting frequency of the inverter lighting circuit.
The illumination control device according to 2 or 3. 5. The lighting control device according to claim 1, wherein the collective DC power supply includes a harmonic suppression circuit. 6. The lighting control device according to claim 1, wherein a plurality of lighting devices are provided.