JPS5853186A - Automatic dimmer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an automatic light control device, more specifically, an illuminance detector that detects the V7M illuminance of a surface to be illuminated, an illuminance setting section that sets a target illuminance of the surface to be illuminated, The present invention relates to an automatic light control device that includes a comparator that compares the target illuminance and the actual illuminance and outputs the deviation between the two illuminances, and an output control section that controls the lamp output so that the deviation becomes zero.

This type of automatic light control device is generally capable of automatically controlling light so that the illuminance of the surface to be illuminated is kept constant even if the external light illuminance due to natural light or other illumination lids fluctuates. but,
In this case, generally speaking, considering the economical efficiency of the lighting device, it is better to provide an appropriate lower level at 0-1 rather than full dimming from 100 to 0. Therefore, when using such a lighting device as a load, it is suitable! It is necessary to set a lower limit level of 1 and hold it there, but holding it in this way has the disadvantage that power saving must be sacrificed to 11.

The invention consists in eliminating this drawback.

In order to achieve this object, the present invention provides the above-mentioned automatic light control device including a light control lower limit setting circuit that sets a light control lower limit value, and a light control lower limit setting circuit that is installed in front of the output control section and that outputs a signal from the comparator. a high value priority circuit that outputs the larger signal of the deviation output and the setting output of the [14 party lower limit setting circuit], and a state in which this high value priority circuit outputs the setting output of the dimming lower limit setting circuit. The present invention is characterized in that it is provided with a timer circuit that sets the output of the output control section to zero when t continues for a predetermined period of time. By doing this, when the outside light becomes strong, the lower dimming limit will be maintained for a certain period of time and then the light will turn off, which will prevent unpleasant conditions such as repeated blinking near the lower dimming limit. Moreover, it is possible to realize power-saving lighting.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a block diagram of the apparatus of the present invention. For example, a lighting device 3 to which a discharge lamp such as a fluorescent lamp is connected is supplied with phase-controlled AC power from an AC power source 1 via a phase control device 2. The zero-phase control device 2 is a tri-actuator, anti-parallel series thyristor. It consists of a controllable l-adjustable rotor, such as the following, and its ignition is controlled by a control device 4.

The control device 4 includes a control signal generation circuit 5.

The control signal generation circuit 5 outputs a firing pulse for controlling the phase of the phase control device 2t in synchronization with the synchronization signal from the synchronization circuit j37 connected to the power supply 1 according to the input signal from the high value priority circuit 6. . The high value priority circuit 6 is a circuit that compares the deviation signal from the comparator 8 and the dimming lower limit setting signal from the lower limit setting circuit 9, and passes the larger of the two signals. The target illuminance signal is input to the comparator 8 from the illuminance setting section 10, and a signal corresponding to the actual illuminance of the illuminated surface detected by the illuminance detector 11 is amplified! 612, and outputs a signal corresponding to the deviation between both inputs, that is, the value obtained by subtracting the actual illuminance from the target illuminance. A timer circuit I3 is attached to the dimming lower limit setting circuit 9. The timer circuit 13 measures the time during which the output signal from the dimming lower limit setting circuit 9 passes through the high value priority circuit 6, and when the output signal passes through the high value priority circuit 6 for a certain period of time, for example, 20 seconds, the control signal generation circuit 1 signal" to operate the phase control device 2 so as to make its output zero.

In the apparatus shown in FIG. 1, conventionally known basic parts constituting this type of automatic control IL system can be used.

FIG. 2 shows a specific example of a circuit section added according to the invention to the known device section in the device of FIG.

In FIG. 2, the dimming lower limit setting circuit 9 includes a resistor 20 connected to a voltage +V power source and a row of Zener diodes 21't-, and the Zener voltage of this Zener diode 21 exceeds the dimming lower limit value. It is input to the high value priority circuit 6 via the output resistor 22 as a setting signal to be displayed. The high value priority circuit 22 consists of a pair of diodes and δ connected so that their cathodes face each other, and the output signal of the dimming lower limit setting circuit 9 taken out through a resistor 22t is input to the anode side of the diode 24. . A deviation output signal from the comparator 15F8 is input to the anode side of the diode 5.

The common connection point (cathode) of both diodes 24 and 25 is led to the control input terminal of the control signal generation circuit 5. The timer circuit 9 includes a capacitor 27 and a transistor parallel to it. The content +27 is connected to the +V power supply. resistance 2
When the charging voltage reaches the Zener voltage of the Zener diode 30, an off signal is sent to the control signal generation circuit 5 through the Zener diode 30, and the output of the phase control device 2 is made zero. . The output terminal of the resistor 22, that is, the resistor 22 is connected to the base of the transistor.
A base current is supplied from a common connection point between the zener diode 31 and the diode 24 through the Zener diode 31 and the pace resistor 32t.

The apparatus shown in Figures 1 and 2 operates as follows.

First, when the outside light is less than a predetermined value, that is, when the outside light is equal to or less than a predetermined value, the true nine of the lamp, which is calculated as 119-1 by the device of the present invention, accounts for the illuminance of the illuminated surface obtained by the outside light and the illumination by the present implementation device S:. The value obtained by subtracting the lower limit value corresponding to the illuminance component LN (see Figure 3) is the above illuminance component I+Jt from the target illuminance L0.
- If it is less than the subtracted value, it means that the intensity of external light is 21 points or less in FIG. In Figure @3, the horizontal axis represents the intensity of external light on the illuminated surface, the vertical axis represents the illuminance there, and the characteristic line A represents the actual illuminance 1 of the illuminated surface.
This consists of an illuminance component due to the lamp whose dimming is controlled by the device of the present invention, and an illuminance component due to external light. The characteristic line B shows the illuminance component Lsj- of the actual illumination represented by the characteristic line A. Now,
When the intensity of external light is below P1, the magnitude of the deviation signal output from the comparator 8 exceeds the dimming lower limit value output from the dimming lower limit setting circuit 9, so the high value priority circuit 6 switches the diode 25 off. The output signal t of the comparator 8 is led to the control signal generating circuit 5 via the t-control signal generating circuit 5 for constant light control. At this time, the diode is in the block foreshadowing, the resistor is 22, and the Zener diode is 3.
A base current is supplied through the transistor 1 and the resistor 32 to turn on the transistor. Therefore, the capacitor 27 is short-circuited by the transistor, and the "off (i!)" signal is not generated.

When the intensity of external light becomes stronger than the point 21 in FIG. Therefore, constant adjustment control at the lower limit value, which corresponds to most of the levels in FIG. 3, is performed here. This state is
In particular, the ja stand where the outside light has become stronger and continued for a long time,
This results in wasted power consumption.

Therefore, in this state, the diode 24 becomes conductive and supplies the entire current to the control signal generation circuit 5, so that the potential on the output end side of the resistor 22 (diode 244Ay) decreases, and the Zener diode 31 blocks the pace current. In this state, the transistor device is turned off. Therefore, the capacitor +27 starts to be charged via the resistor 29 from the moment the control is started at the lower limit, and the charging voltage gradually increases.When the charging voltage reaches the Zener voltage of the Zener diode J, , an "off signal" is supplied to the control signal generation circuit 5 via this Zener diode J, and the output of the phase control device 2 is controlled to zero. This state continues until the intensity of external light decreases to 21 points or less. The timer circuit 13 prevents power consumption from being wasted in this way, and on the other hand, if the intensity of external light is
This has the dual effect of avoiding frequent flashing of the lamp even when a situation that changes across both sides of the 21 points in the figure is repeated.

As described above, according to the present invention, when the external light is relatively weak, constant illuminance illumination is performed at the target illuminance, and when the external light becomes strong, the lower limit dimming is maintained for a certain period of time, By turning off the light after that, it is possible to realize power-saving lighting without repeating blinking near the dimming lower limit value.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a connection diagram showing the internal configuration of the main parts of Fig. 1, and Fig. 3 explains the operation of the device shown in Figs. 1 and 2. This is a diagram for 2 - phase control device, 3 - lighting device, 4... control device,
5-control signal generation circuit, 6... high value priority circuit, 8-...
Comparator, 9... Dimming lower limit setting circuit, 10-- Illuminance setting section, 11-- Illuminance detector, 13... Timer circuit. Applicant's agent Inomata Sei Procedural Amendment (formality) 1. Display of the case Showa x year patent application No. 151802 2, Name of the invention Automatic light control device 3, Person making the amendment Relationship to the case Patent applicant Drawing 8, Contents of the amendment Engraving of the drawing (no change in content)

Claims (1)

[Claims] an illuminance detector that detects the actual illuminance of the illuminated surface; an illuminance setting unit that sets the target illuminance of the illuminated surface; a comparator that compares the target illuminance and the actual illuminance and outputs a deviation between both illuminations i; In an automatic light control device with an output control unit that controls lamp output so as to make a front-deployment difference zero and a fully polarized light control unit, a dimming lower limit setting circuit that sets a dimming lower limit value, and a dimming lower limit setting circuit that is arranged in front of the output control unit,
The high value priority circuit outputs the larger signal of the deviation output from the comparator and the setting output of the dimming lower limit setting circuit, and the high value priority circuit outputs the setting output of the dimming lower limit setting circuit. An automatic light control device comprising: a timer circuit that makes the output of the output control section zero when the output state continues for a predetermined period of time.