JP2942425B2 - Light control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimmer capable of automatically correcting a voltage fluctuation of an AC power supply in accordance with a plurality of required dimming curve characteristics.

[0002]

2. Description of the Related Art Conventionally, it is difficult to easily achieve a required dimming curve characteristic with an analog type dimming device, and it is necessary to respond to a voltage fluctuation of an AC power supply in accordance with only one required dimming curve characteristic. It is practically difficult to accurately perform the correction due to restrictions on the circuit configuration. It is more difficult to accurately correct the voltage fluctuation of the AC power supply in accordance with a plurality of required dimming curve characteristics.

[0003]

On the other hand, a light control device based on digital data has an advantage that a required light control curve characteristic can be easily realized. However, a technique that can accurately correct the voltage fluctuation of the AC power supply in accordance with the types of the required dimming curve characteristics has not been developed. In particular, recently, the types of required light control curve characteristics have increased, and it has become increasingly necessary to be able to accurately correct the voltage fluctuation of the AC power supply according to the types of light control curve characteristics.
The present invention has been made in view of the above circumstances, and provides a dimming device that can automatically and accurately correct a voltage fluctuation of an AC power supply according to a plurality of required dimming curve characteristics.

[0004]

According to the present invention, there is provided a configuration in which a signal generated from a function generator in synchronization with an AC power supply is supplied to a phase controller through a D / A converter to control the phase of a light source. A configuration for supplying a signal from a voltage detection unit for detecting a voltage fluctuation of a power supply to a D / A conversion unit via a voltage fluctuation correction unit, and a function selection unit for selecting a specific function from a plurality of functions of the function generation unit , Voltage fluctuation correction means and D / A
A specific correction element is automatically selected from a plurality of correction elements of the voltage fluctuation correction means based on a signal interposed between the conversion means and selected by the function selection means, and a specific correction signal is supplied to the D / A conversion means. And a correction element selecting means.

[0005]

According to the present invention, the function generating means can store the dimming curve characteristics as digital data and can easily cope with various types of required dimming curve characteristics. Then, a specific correction element is automatically selected from the plurality of correction elements of the voltage fluctuation correction means based on a signal obtained by selection of the function selection means for selecting a specific function from the plurality of functions of the function generation means, and D / D Since the A conversion means is provided with the correction element selection means for supplying a specific correction signal, it is possible to automatically and accurately correct the voltage fluctuation of the AC power supply according to the individual dimming curve characteristics to be used.

[0006]

An embodiment of the present invention will be described with reference to the drawings.

In this embodiment, a signal generated from a function generator 2 in synchronization with an AC power supply 1 is multiplied by a D / A converter 3 of a multiplication type.
And a signal from a voltage detecting means 6 for detecting a voltage fluctuation of the AC power supply 1 is supplied to a phase control means 4 through a voltage fluctuation correcting means 7 via a D / A converting means 3. And a configuration for supplying the same. Further, a function selecting means 8 for selecting a specific function from a plurality of functions of the function generating means 2 and a signal interposed between the voltage fluctuation correcting means 7 and the D / A converting means 3 based on a signal selected by the function selecting means 8 , A plurality of correction elements 7a, 7b,.
And a correction element selecting means 9 for automatically selecting a specific correction element (for example, 7a) from the control signal and supplying a specific correction signal to the D / A conversion means 3.

More specifically, the AC power supply 1 is connected to the voltage detecting means 6 via the transformer 10. Further, the transformer 10 is connected to the address control means 12 via the synchronization signal generation means 11, and the function generation means 2 sends bit data to the D / A conversion means 3 by the address control means 12. The output of the D / A conversion means 3 is, for example,
a, and controls the phase of the light source 5 of an incandescent lamp or a fluorescent lamp via a phase control element 13 such as a triac or thyristor. Reference numeral 14 denotes a clock generation unit connected to the address control unit 12, and reference numeral 15 denotes a DC power supply which is supplied to the dimming control unit A and the phase control unit 4.

To explain the operation according to this embodiment, the synchronizing signal generating means 11 sends a power synchronizing signal synchronized every half cycle of the AC power supply 1 to the address control means (address counter) 12. The address control means 12 is reset by the power supply synchronizing signal, specifies the address of the function generation means 2 stored in ROM for each half cycle of the AC power supply 1 starting from address 0, and designates the bit data as D / A.
The data is read out by the conversion means 3. As shown in FIG. 3, the function generating means 2 sets an address corresponding to the phase of the AC power supply 1 and bit data corresponding to the address to correspond to the dimming curve characteristic.

The D / A conversion means 3 multiplies the dimming data consisting of the set of bit data by n times (for example, 4 times) and converts it into a dimming curve which is an analog signal. This dimming curve signal is supplied to the comparing means 4a of the phase control means 4, and is compared with a DC voltage (DC 0 to 10V) supplied from a fader (not shown) to form a trigger signal. Then, the phase of the light source 5 is controlled by the phase control output by the phase control element 13.

Here, the characteristics of the function generating means 2 shown in FIG. 3 will be described in correspondence with the DC voltage (shown by a horizontal dotted line) applied to the comparing means 4a by the operation of the fader described above. If there is a DC voltage as indicated by a dotted line, the above-described trigger signal is generated at a phase as indicated by a vertical dotted line a, and the light source 5 is phase-controlled starting from the trigger signal. However, in order to cope with the case where the DC voltage exceeds 10 V for some reason, the bit data is set so as to rapidly change in the vicinity of the end of the address in response to a very small change in the address, and to change the end of the address. The settings are almost the same up to the section. In such a case, the trigger signal does not come to the left (that is, earlier in phase) than the vertical dotted line b due to the unique bit data characteristic from the vicinity of the end to the end of the address as described above. As a result, the conduction phase angle of the phase control element 13 is not excessively advanced, so that unstable conduction of the phase control element 13 near the zero crossing of the AC power supply 1 can be prevented, and thus the light source 5 can be prevented from flickering. I have.

Next, as described above, according to the configuration in which the signal from the voltage detecting means 6 for detecting the voltage fluctuation of the AC power supply 1 is supplied to the D / A conversion means 3 via the voltage fluctuation correcting means 7, It is possible to correct the voltage fluctuation of the power supply 1 (for example, to stabilize the light amount of the light source 5 and the effective power applied to the light source 5). However, the correction when the function generating means 2 has a plurality of dimming curve characteristic data is a problem. Becomes That is, the correction for the voltage fluctuation of the AC power supply 1 differs depending on the type of the dimming curve characteristic (for example, the second power, the 2.3 power, the third power, ...).
If this correction cannot be made properly, it will be bad.

As described above, the function selecting means 8 selects a specific function from the plurality of functions of the function generating means 2;
A specific correction element (for example, from a plurality of correction elements 7a, 7b,... Of the voltage fluctuation correction means 7 based on a signal interposed between the voltage fluctuation correction means 7 and the D / A conversion means 3 and selected by the function selection means 8). 7a) is provided by a correction element selection means (data selector, multiplexer, etc.) 9 which is automatically selected and supplies a specific correction signal to the D / A conversion means 3. That is, function selection means 8 (switch)
, A specific correction element (for example, 7a) is automatically selected from the plurality of correction elements 7a, 7b,... Of the voltage fluctuation correction means 7 in accordance with the selected function, and D / A converted. A specific correction signal is supplied to the means 3 and the D / A
It is multiplied by the conversion means 3 and output. Individual correction elements 7
a, 7b,... have a group of amplifiers with different amplification factors. An appropriate amplifier is selected according to the function to be used, and an accurate correction is made according to the selected function. In addition, a method may be used in which one amplifier is used and various feedback resistors having different values are prepared, and one of the resistors is automatically selected, and as a result, the amplification factor is different. The correction result is as shown in FIG. 4. A dimming curve is drawn when the voltage of the AC power supply 1 is three, and the higher the voltage, the higher the voltage in accordance with the waveforms A, B and C corresponding to 115V, 100V and 90V. , The trigger signal starts with a lag phase, and the phase control output also has a lag phase and is corrected.

[0014]

As described above, according to the present invention, it is possible to provide a light control device capable of automatically and accurately correcting a voltage fluctuation of an AC power supply according to a plurality of required light control curve characteristics. .

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an internal configuration of the voltage fluctuation correction means.

FIG. 3 is a characteristic diagram of the function generating means.

FIG. 4 is a waveform diagram of each part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Function generation means 3 D / A conversion means 4 Phase control means 5 Light source 6 Voltage detection means 7 Voltage fluctuation correction means 7a Correction element 7b Correction element 8 Function selection means 9 Correction element selection means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-49-68569 (JP, A) JP-A-6-1226095 (JP, U) JP-A-3-58898 (JP, U) 18318 (JP, B2) (58) Field surveyed (Int. Cl. ⁶ , DB name) H05B 39/04-39/09

Claims (1)

(57) [Claims] 1. A configuration in which a signal generated from a function generator in synchronization with an AC power supply is supplied to a phase controller through a D / A converter to control the phase of a light source, and a voltage for detecting a voltage fluctuation of the AC power supply. A structure for supplying a signal from the detection means to the D / A conversion means via the voltage fluctuation correction means, a function selection means for selecting a specific function from a plurality of functions of the function generation means, a voltage fluctuation correction means, A specific correction element is automatically selected from a plurality of correction elements of the voltage fluctuation correction means based on a signal interposed between the A conversion means and selected by the function selection means, and a specific correction signal is sent to the D / A conversion means. A dimming device comprising: a correction element selection unit for supplying the light.