JPS58838B2 - Automatic flashing device with timer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic flashing device with a timer, and its purpose is to be able to normally turn on a load such as a lighting fixture for a certain period of time at night, and also to enable manual flashing at night. An object of the present invention is to provide an automatic flashing device with a timer that can turn on and off the load.

Generally, lighting equipment such as garden lights are automatically turned on at night,
Automatic flashers are provided to turn off the lights during the day.

In recent years, in order to conserve power resources, it has become more convenient to turn on lighting equipment at night and then turn it off after midnight when it is not really needed, especially for equipment with strong decorative elements, such as garden lights.

The present invention was invented in view of this point, and the present invention will be described in detail below based on one embodiment.

FIG. 1 is a block diagram showing one embodiment of the present invention.
is a photodetection circuit composed of a photodetection element 5 such as a CdS photoconductive cell that detects ambient brightness, and a switching circuit 6 having hysteresis characteristics such as a Schmitt circuit, and detects when the ambient brightness exceeds a predetermined value. When this happens, a photodetection output is generated.

8 is a counting circuit constructed by cascading n stages of frequency dividers 8a8c8c.

Here, the cascade connection generally refers to a multi-stage connection in which the output terminal of the previous stage is connected to the input terminal of the next stage, and the subsequent connections are made in the same way. This is a connection method in which the -1 frequency divided output is connected to the input of the frequency divider 8 at the next stage.

Each frequency divider 83 to 8b is, for example, a JK flip-flop.
The output Q
In this case, one pulse is output every time two pulses are input by using a frequency-divided output.

Of course, other flip-flops are used to divide the frequency divider 8a.
~8c may be configured.

When such frequency dividers 8a to 8c are connected in series in multiple stages,
It is possible to count the predetermined pulses from the oscillation circuit 7 that are input to the first-stage frequency divider 8a.

Assuming that each of the frequency dividers 8a to 8c outputs one pulse every time two pulses are input, the output of the frequency divider 8c at the final stage (that is, the nth stage) is the 2n-1th pulse. It becomes a high level when a pulse of 1 is input, and until then, the output of the frequency divider 8c, that is, the output of the counting circuit 8, is at a low level.

Therefore, if the period of the output pulse of the oscillation circuit 7 is T, the output of the counting circuit 8 will be at a low level for a predetermined time 2n-1,T, and after the elapse of this predetermined time, the output of the counting circuit 8 will be at a low level. The output is at a high level.

The reset terminal R of each frequency divider 8a, sb, 8c of this counting circuit 8 is connected to the output terminal of the photodetector circuit 1 directly or via an OR gate 15. ), the frequency dividers 8a, 8b, and 8c are reset, and the counting circuit 8 performs counting based on the light non-detection output (low level) of the photodetector circuit 1, and keeps its output terminal in the low level state for a preset time. It is designed to be retained.

9 is an AND circuit connected between the oscillation circuit 7 and the first frequency divider 8a, and when the output of the n-th stage frequency divider 8c becomes high level, the clock pulse input from the oscillation circuit 7 is input. is stopped to maintain the high level state of the n-th stage frequency divider 8c.

Reference numeral 3 denotes an AND circuit which receives the inverted input of the low level output of the counting circuit 8 and the inverted input of the light non-detection output (low level) of the photodetector circuit 1 and generates an output.

Reference numeral 11 denotes an output circuit that receives the output from the AND circuit 3 and closes the operation switch 12.
(hereinafter simply referred to as a load 4) is turned on by a power source 10.

The AND circuit 3 and the output circuit 11 constitute a drive circuit 20.

Therefore, the counting circuit 8 is intended to function as a time limit switch that determines the lighting time of the load 4.

Reference numeral 13 denotes a push-on switch connected to the counting circuit 8 by two wires, and is connected to the n-th stage frequency divider 8 of the counting circuit 8.
c is connected to the input end portion of the frequency divider 8b of the (n-1)th stage together with the output of the frequency divider 8b of the (n-1) stage via an OR gate 14, and each of the frequency dividers 8a up to the (n-1)th stage except the n-th stage .

It is connected to the reset terminal R of 8b together with the output terminal of the photodetector circuit 1 via an OR gate 15.

When this switch 13 is pressed, an ON output (high level) is applied to the reset terminal R of each of the frequency dividers 8a and 8b up to the previous stage except the nth stage, and at the same time, an on output (high level) is applied to the input terminal of the frequency divider 8c of the nth stage. An on output is added to the output.

Next, the operation of the above embodiment will be explained.

When the surroundings are bright during the day, a photodetection output (high level) is generated from the photodetection circuit 1, the counting circuit 2 is reset, and the AND circuit 3 is in a state where no output is generated.

When the surroundings become dark, a non-light detection output (low level) is generated at the output terminal of the photodetection circuit 1, so the output terminal of the counting circuit 8 is at a low level for a predetermined time, and an output is generated at the AND circuit 3, causing the load 4 to light up. .

When the switch 13 is pressed when the load 4 is turned on, the output of the n-th stage frequency divider 8c is inverted from a low level to a high level, turning off the output circuit 11 and turning off the load 4.

At this time, at the same time, each frequency divider 8a before the (n-1)th stage,
8b is reset to zero.

When the switch 13 is turned on again by pressing the switch 13 in this state, the n-th stage frequency divider 8c is inverted from high level to low level, the load 4 is lit again, and the counting circuit 8 starts from zero and reaches a predetermined value. Turn on load 4 until the hour.

This state is shown as a time chart in Figure 2.
A is the output of each frequency divider 8a, ab up to the previous stage except for the nth stage, mouth is the output of the nth stage frequency divider 8c, and C is the switch 13
2 shows the on/off state of the load 4, and 2 shows the blinking state of the load 4.

Next, at night, after the counting circuit 2 times up and the load 4 turns off, if you want to turn on the load 4 again, press the switch 13, and the n-th stage frequency divider 8c will be inverted from high level to low level, and the load 4 will turn off. 4 lights up.

If it is desired to turn off the load 4, the switch 13 is pressed again, and the n-th stage frequency divider 8c is inverted from low level to high level, turning off the output circuit 11, and the load 4 is turned off.

The state at this time is shown in Fig. 3, with
Honey is number 49 in Figure 2.

Ha, it corresponds to the second one.

Note that if the surroundings temporarily become dark during bright daytime, the counting circuit 8 performs a counting operation and the load 4 lights up, but when it becomes bright again, the counting circuit 2 is always reset to zero.

Since the present invention is configured as described above, although the load can be automatically turned on and off depending on the surrounding brightness, it is also possible to manually turn on and off the load at night by turning the switch on and off. It has the effect of allowing you to manually control the load as needed without being affected by the automatic flashing mechanism at night, and also has the effect of allowing you to control the load manually as needed, without being affected by the automatic flashing mechanism. The lighting load can be turned on and off using a manual switch using a switch, which has the effect of simplifying the circuit configuration by eliminating the need for a flip-flop for manual operation.Moreover, the light detection circuit has a light detection output. When this occurs, each frequency divider in the counting circuit is always reset, and even if a temporary dark state occurs during the day, the counting time of the counting circuit at night will not be affected, and the normal lighting time can be obtained. Furthermore, even if the counting circuit malfunctions due to temporary brightness at night or a power outage, it will only be temporary and will always return to normal when the surroundings become brighter the next morning. This has the effect that normal lighting time can be obtained from next time onwards.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are time charts for explaining the operation of the same, in which 1 is a photodetection circuit, 4 is a load, and 7 is an oscillation circuit. , 8
are counting circuits, 8a and 8b. 8c is a frequency divider, 13 is a switch, and 20 is a drive circuit.

Claims (1)

[Claims] 1 consists of a photodetection circuit that detects brightness above a predetermined level in the surroundings and generates a photodetection output, and a frequency divider consisting of multiple stages of cascaded flip-flops. A counting circuit for determining the lighting time of the lighting load, which receives pulses and outputs a counting period end output to the final stage frequency divider when the number of input pulses reaches a predetermined number; It is equipped with a drive circuit that drives a lighting load by using the counting period non-completion output from the counting circuit as an AND input, and connects the final stage frequency divider input of the counting circuit to the previous stage frequency divider output and the manual switch. The reset input to each frequency divider up to the previous stage except the last stage is used as the OR input with the ON output of the above switch and the photodetection output of the photodetection circuit, and the photodetection output An automatic flashing device with a timer, characterized in that: is used as a reset input for a final stage frequency divider.