JPH10321380A - Illumination control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a timer of dedicated use for measurement of an illumination control device for controlling an illumination state with a microcomputer. SOLUTION: A DC power source (vdd) 2 is supplied to a microcomputer 3 and a reset circuit 4 of the microcomputer 3, a power source detecting signal (a) from a power source detecting circuit 5 of an AC power source 1 is inputted to the microcomputer 3, and an illumination load 6 is controlled based on a control signal from the microcomputer 3. When the illumination load 6 is in an off state, by turning off a wall switch in a room, at the point of time when the power source detecting circuit 5 detects the shut off of the AC power source 1, that is, within the time (for example within 1.7 sec) from time t1 until the reset circuit 4 resets the microcomputer 3 by voltage drop of the DC power source 2, when the AC power source 1 is inputted at time t2, the microcomputer 3 outputs a control signal for lighting the illumination load 6. When the AC power source 1 is inputted at for example t3 exceeding the time t2, the microcomputer 3 outputs the control signal for making the illumination load 6 in an off state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination control device based on microcomputer control for controlling an illumination state based on the duration of interruption of an AC power supply.

[0002]

2. Description of the Related Art This type of device is convenient because a lighting load can be turned on after a short-time AC power supply is cut off within a predetermined time (about 1 to 2 seconds) by operating a wall switch in a room.

[0003]

However, it should be noted that since a timer for measuring the predetermined time is separately provided, there is a problem to be solved that is disadvantageous in terms of cost and miniaturization. is there. The present invention has been made in view of such problems to be solved, and has as its object to provide a lighting control device that does not require a dedicated timer for measuring the predetermined time.

[0004]

SUMMARY OF THE INVENTION In summary, a DC power supply obtained by rectifying an AC power supply is supplied to a microcomputer and a reset circuit of the microcomputer, and a power supply detection signal from a power supply detection circuit of the AC power supply. Is input to the microcomputer,
A lighting control device in which a lighting load is controlled based on a control signal from a microcomputer. If the lighting load is in an off state, the lighting control device is reset by a voltage drop of a DC power supply from a point in time when a power supply detection circuit detects interruption of the AC power supply. During the time until the circuit resets the microcomputer, if the AC power is turned on, the microcomputer outputs a control signal for turning on the lighting load, and if the AC power is turned on beyond the time, The microcomputer is a lighting control device that outputs a control signal for turning off a lighting load.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described. However, these are merely exemplary embodiments adopted based on the present invention, and the present invention is limited to matters unique to only the embodiments. The technical scope of the present invention must be determined based on the matters stated in the claims or matters that are substantially equivalent thereto.

In the illustrated embodiment, a DC power supply (Vdd) 2 obtained by rectifying an AC power supply 1 is supplied to a microcomputer 3 and a reset circuit 4 of the microcomputer 3, and the AC power supply 1
The power supply detection signal a from the power supply detection circuit 5 is input to the microcomputer 3 and the lighting load 6 is controlled based on the control signal from the microcomputer 3. When the lighting load 6 is off, the wall switch in the room is turned off, and the reset circuit is activated by the voltage drop of the DC power supply 2 from the time when the power supply detection circuit 5 detects the interruption of the AC power supply 1, that is, from time t1. If the AC power supply 1 is turned on, for example, at time t2 within a time (for example, within 1.7 seconds) until the microcomputer 4 resets the microcomputer 3, the microcomputer 3 sends a control signal for turning on the illumination load 6 to the lighting state. Output. Further, when the AC power supply 1 is turned on at the time t3, for example, after the time, the microcomputer 3 outputs a control signal for turning off the illumination load 6.

More specifically, at time t1, the AC power supply 1
Is cut off, the voltage b of the DC power supply 2 drops, but if the AC power supply 1 is turned on before reaching the predetermined voltage r, the reset circuit 4 is not reset, so that the microcomputer 3 turns the lighting load 6 on. A control signal can be output. After the voltage b reaches the predetermined voltage r, the reset circuit 4 is reset, and the microcomputer 3 outputs a control signal for turning off the illumination load 6.

According to the present embodiment, it is possible to provide a lighting control device which does not require the dedicated timer for measuring the above-mentioned predetermined time, which is advantageous in terms of cost and miniaturization.

[Brief description of the drawings]

FIG. 1 (A) Circuit block diagram (B) Time chart of the same operation

[Explanation of symbols]

 Reference Signs List 1 AC power supply 2 DC power supply (Vdd) 3 Microcomputer 4 Reset circuit 5 Power supply detection circuit 6 Lighting load

Claims (1)

[Claims] 1. A DC power supply obtained by rectifying an AC power supply is supplied to a microcomputer and a reset circuit of the microcomputer, and a power supply detection signal from a power supply detection circuit of the AC power supply is input to the microcomputer, and control from the microcomputer is performed. A lighting control device in which a lighting load is controlled based on a signal, and in a case where the lighting load is in an off state, a reset circuit activates a microcomputer by a voltage drop of a DC power supply from a point in time when a power supply detection circuit detects interruption of an AC power supply. If the AC power is turned on within the time until the reset, the microcomputer outputs a control signal for turning on the lighting load.If the AC power is turned on beyond the time, the microcomputer outputs the lighting load. A lighting control device that outputs a control signal for turning off the light.