JPH0347280Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a light control device that increases or decreases the brightness of a lighting load.

[Background technology]

BACKGROUND ART Conventionally, dimming devices have been widely used that allow the brightness of a lighting load to be freely increased or decreased by operating a dimming level setting section (fader). However, in such conventional examples, the brightness of the lighting load changes immediately when the fader is operated, and therefore, when the fader is suddenly operated, the light output also changes rapidly. There was a problem in that it gave a visually and psychologically unpleasant feeling.

[Purpose of invention]

The present invention has been developed in view of the above-mentioned points, and even when the dimming level setting section is suddenly operated, the light output is gradually changed so that comfortable dimming control can be performed at all times. It is an object of the present invention to provide a light control device as described above.

[Disclosure of invention]

The configuration of the present invention will be described below with reference to illustrated embodiments. FIG. 1 is a circuit diagram showing a schematic configuration of a light control device according to an embodiment of the present invention. In the same figure,
MF ₁ to _{MF 3} are master faders that collectively increase or decrease the brightness of each lighting load L ₁ and L ₃ . Furthermore, SF ₁ and SF ₂ are single faders, which apply dimming level signals to the dimming units A ₁ and A ₂ , respectively, and individually increase or decrease the brightness of each lighting load L ₁ and L ₂ . It is. Master feeder MF ₁ to _{MF 3} and single feeder
In the embodiment, SF ₁ and SF ₂ are configured by variable resistors. T ₁ to _{T 3} are master fader switching units, and the output of any one of the master faders MF ₁ to _{MF 3} is input to the delay circuit unit B. This master feeder switching section T ₁ to _{T 3}
are composed of photocouplers, and one of them is controlled to be turned on by a master fader switching selection device S. Master fader switching selection device S
consists of a timer unit, for example, and the lighting load L ₁ ,
I am starting to run _L2 on a time schedule. The delay circuit section B is composed of an emitter-follower connected input buffer transistor _Q1 , a capacitor C and a resistor R forming a CR integration circuit, and an emitter-follower connected output buffer transistor _Q2 . Now, the outputs of master feeders MF ₁ , MF ₂ , MF ₃ are at potential V ₁ , respectively.
V ₂ and V ₃ (V ₁ > V ₂ > V ₃ ), and master fader MF ₁ is selected (that is, master fader switching section T ₁ is on and T ₂ and T ₃ are off). ), the capacitor C of the delay circuit section B is charged to a certain potential Vc ₁ , and the single fader SF ₁ ,
SF ₂ is given a potential obtained by subtracting the base-emitter forward drop voltage VBE of transistor Q ₂ from the potential Vc ₁ . Next, when an on signal is output from the master fader switching selection device S to the master fader switching unit T ₂ and the master fader MF ₂ is selected, the input voltage of the delay circuit unit B changes from the potential V ₁ to the potential V ₂ . At the same time that the charge in the capacitor C is discharged through the resistor R, the dimming level signal also gradually changes to another level in proportion to the potential of the capacitor C. Similarly, when the master faders MF ₁ to MF ₃ are switched, the brightness of each lighting load L ₁ and L ₂ gradually increases or decreases to another level. Furthermore, even when the knob of the currently selected master fader (for example, MF ₂ ) is operated, the potential of capacitor C and the dimming level signal will gradually change in accordance with the change, and therefore the lighting load L will change gradually. The brightness of ₁ and L ₂ changes gradually. However, when the single fader SF ₁ or SF ₂ is operated, the brightness of the lighting loads L ₁ and L ₂ changes immediately. This is because the single faders SF ₁ and SF ₂ are provided at a later stage than the delay circuit section B in this embodiment.

Here, the delay circuit section B is a transistor connected as an emitter follower at the front stage of the CR integration circuit.
Q ₁ and the master feeders MF ₁ to _{MF 3} are not inserted in the charging/discharging path of capacitor C, so the time constant of the CR integration circuit is determined only by resistor R and capacitor C. , capacitor C by operating master feeders MF ₁ to MF ₃ .
There is no change in the charge/discharge curve. That is,
Depending on the settings of master faders MF ₁ to MF ₃ ,
The voltage across the emitter resistor of transistor _Q1 changes, and the voltage across capacitor C changes on a constant charge/discharge curve depending on the difference between the voltage across this emitter resistor and the voltage across capacitor C. be.

FIG. 2 is a circuit diagram of another embodiment of the present invention.
In this embodiment, an operational amplifier P, a resistor R, a relay contact r ₁ , and a capacitor C are connected between the output of the input buffer transistor Q ₁ and the input of the output buffer transistor Q ₂ in the delay circuit section B. When the master fader switching selection device S is switched, the transistor is connected via the one-shot multivibrator MV.
Q ₃ , relay R ₁ is turned on for a certain period of time t ₁ and relay contact r ₁ is closed for a certain period of time t ₁ . That is, in this FIG. 2 embodiment,
Selected master fader (e.g. MF ₂ )
When operating , a change in dimming level is immediately obtained through the operational amplifier P, but when switching the master faders MF ₁ to MF ₃ , the relay contact r ₁ is turned on for a certain period of time t ₁ as described above.
A capacitor C is connected between the input and output of the operational amplifier P to form an integrating circuit, and the dimming level signal changes gradually. The time t ₁ that relay contact r ₁ is closed is the period when the output voltage from master faders MF ₁ to MF ₃ is changed from minimum to maximum or from maximum to minimum until the dimming level settles to the final level. is set at the time. After the predetermined time t ₁ has elapsed, the contact r ₁ of the relay R ₁ is opened again, and when the newly selected master fader (for example, MF ₃ ) is operated, the dimming level changes immediately.

In the embodiment shown in FIG. 3, a delay circuit section B including a capacitor C and a resistor R is provided on the output side of the single faders SF ₁ and SF ₂ , that is, on the input side of the dimming sections A ₁ and A ₂ . The dimming level is made to change gradually not only when switching between MF ₁ to MF ₃ and during manual operation, but also during manual operation of single faders SF ₁ and PF ₂ .

In each of the above embodiments, a trigger circuit made of a relaxation oscillation circuit, for example, is used as the dimming units A ₁ and A ₂ and the dimming level of the lighting loads L ₁ and L ₂ is adjusted by controlling the phase of a thyristor such as a triac. It controls the Furthermore, in each of the above embodiments, for example, as illustrated in FIG.
The reason why emitter-follower connected transistor Q ₂ is always provided before and after SF ₁ , SF ₂ is because several to several dozen single feeders SF ₁ , SF ₂ ,... are connected, so the number of This is to prevent the inconvenience that the voltage applied to each single fader SF ₁ , SF ₂ , . . . drops and the maximum dimming level decreases when there are a large number of faders.

[Effect of idea]

The present invention is configured as described above, and includes a delay circuit including a CR integrating circuit that outputs changes in input voltage as slow voltage changes, in the front stage of a dimming section that controls dimming of a lighting load according to input voltage. Even if the output of the dimming level setting part changes rapidly, the input voltage of the dimming part, which determines the brightness of the lighting load, always changes slowly. As a result, the brightness of the lighting load does not change suddenly, and there is an advantage that it does not cause any discomfort both visually and psychologically.

In addition, since the delay circuit section is equipped with an emitter follower before the CR integration circuit, the dimming level setting section is not inserted into the charge/discharge path of the capacitor in the CR integration circuit, and the time constant of the CR integration circuit is set to the dimming level. It can be determined independently from the setting section, and can be determined by operating the dimming level setting section.
The characteristics of voltage change with respect to time of the CR integration circuit do not change. In this way, since the dimming level setting section does not affect the time constant of the CR integration circuit, the CR integration circuit can be designed independently from the dimming level setting section, making the design easier. .

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of one embodiment of the present invention, Fig. 2 is a circuit diagram of another embodiment of the same as above, Fig. 3 is a circuit diagram of still another embodiment of the same as above, and Fig. 4 is a circuit diagram of another embodiment of the same as above. FIG. 2 is a circuit diagram of main parts of an embodiment. A ₁ and A ₂ are dimming units, B is a delay circuit unit, L ₁ and L ₂ are lighting loads, and MF ₁ to _{MF 3} are master faders.

Claims (1)

[Scope of utility model registration request] A dimmer section that controls dimming of the lighting load according to the input voltage, a delay circuit section that is connected before the dimmer section and includes a CR integration circuit that outputs changes in input voltage as slow voltage changes, and a delay circuit. The delay circuit section includes an emitter follower at the front stage of the CR integration circuit.