JPS6310796B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic power saving device in electrical equipment such as a television receiver.

In electrical equipment, such as a television receiver, once a manual power switch is turned on, it generally remains energized until it is manually turned off. Therefore, each time the user leaves the television receiver, there is the inconvenience of having to manually turn off the power switch. If you forget to turn off the manual power switch and leave the television receiver unattended, you will be wasting electricity and there is a risk of fire or the like.

This invention was made in order to deal with the above-mentioned situation, and when a user remains away from an electrical device that is powered on for a predetermined distance or longer, the power circuit of the electrical device is automatically shut off. The purpose is to provide an automatic power saving device that can be set to an off state.

Embodiments of the present invention will be described in detail below with reference to the drawings. In the following description, the case where the present invention is applied to a television receiver will be exemplified.

FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIGS. 2a to 2m and 3 a to i are signal waveform diagrams of each part. In FIG. 1, 11 is an ultrasonic speaker that emits ultrasonic pulses, and 12 is an ultrasonic microphone that receives reflected waves of the ultrasonic pulses from the user. Reference numeral 13 denotes a first oscillator that generates the ultrasonic pulse generation timing, and its output pulse _S1 is shown in FIGS. 2a and 3a. The oscillation output of this oscillator 13 is supplied to a first monostable multivibrator (hereinafter referred to as MM). This MM
14 derives a pulse S ₂ of constant width as shown in FIG. 2b, which is synchronized with pulse S ₁ . The MM 14 is for determining the emission period of the ultrasonic pulse _S3 , and the second oscillator 15 oscillates for the period of the pulse _S2 , as shown in FIG. 2c, to excite the speaker 11.

The ultrasonic pulse S ₃ emitted from the speaker 11 is received by the ultrasonic microphone 12 either directly or after being reflected by hitting a human being, converted into an electrical signal, amplified by the amplifier 16, and removed by the tuning circuit 17. The frequency component is removed and detected by a diode 18, the carrier component of the oscillator 15 is smoothed by a filter 19, the waveform is shaped by a Schmitt trigger circuit 20, and the signal is supplied to an AND circuit 21. The output waveform of the filter 19 is shown in FIG. 2g, and the output waveform of the Schmitt trigger circuit 20 is shown in FIG. 2h.

The AND circuit 21 is for masking the direct wave from the speaker 11 and the signal received by the microphone 12. The mask pulse for this purpose is the second
Made by MM22. That is, the second
The MM 22 is synchronized with the rise of _the output pulse S _{1 of} the oscillator 13, as shown in FIG. When the output of the Schmitt trigger circuit 20 is masked using this mask pulse _S4 , the signal shown in FIG. This - flipflop 2
The output pulse _S2 of the MM14 is supplied to the set terminal No.3. Therefore, the output terminal of the flip-flop 23 is MM as shown in FIG.
It goes to "H" level at the rising timing of output pulse _S2 of 14, and goes to "L" level at the rising timing of the output pulse of AND circuit 21. In addition, the output terminal Q is as shown in Fig. 2k.
It becomes an "L" level at the rising timing of the output pulse _S2 of the MM 14, and becomes an "H" level at the rising timing of the output pulse of the AND circuit 21.

The third and fourth MMs 24 and 25 are used by the user to determine how far away from the television receiver the television receiver should be turned off in order to save power. That is, MM24 is MM1
A pulse S ₅ (see Figure 2 d) of a predetermined width synchronized with the rising edge _of the output pulse S 2 of MM 25 is derived.
derives a pulse S ₆ (see FIG. 2e) synchronized with the falling edge of MM24. The output of this MM 25 is supplied to AND circuits 26 and 27. The AND circuits 26 and 27 are further supplied with the output terminal of the flip-flop 23 and the output of Q, respectively.

Therefore, if the reflected wave of the ultrasonic pulse from the user exists during the output pulse _S5 period of the MM24 as shown by the broken line _A in FIG. 28 to the reset terminal R of the counter 29, and resets the counter 29. This reset pulse _S7 is shown in FIGS. 2e and 3i. On the other hand, if the reflected wave of the ultrasonic pulse from the user exists outside the period of the output pulse _S5 of the MM24 as shown by the solid line _B in FIG. It is supplied to the clock terminal CK of No. 29. The output pulse _S8 of the AND circuit 26 is shown in FIG. 3b. The counter 29 is activated when the user moves away from the television receiver by a predetermined distance or more, that is, after the reflected wave of the ultrasonic pulse _S3 from the user deviates outside the period of the output pulse _S5 of the MM24. This counter is used to determine the time until the power is turned off. That is, the counter 29 counts the output pulse S ₆ of the MM 25 when it is supplied from the AND circuit 26, and when the count value reaches a predetermined value, derives the pulse S ₉ as shown in FIG. 3C. This pulse S ₉ is the fifth MM30
The pulse is supplied from the output end of this MM30.
S ₁₀ is derived. This pulse _S10 resets the counter 29 and also resets the JK flip-flop 31, whose output is shown in FIG.
As shown in the figure, the relay drive circuit 32 is turned off and the relay 33 is cut off because it is at the "L" level. As a result, the television receiver main body 34
The power supply from the power supply circuit 35 to the main body 34 is stopped. However, since the main power switch 36 is in the on state, the main power circuit 37 of the television receiver is in the on state. Therefore, when operating the television receiver main body 34 again, this main body 34
It is necessary to turn on the manual power switch 38 to invert the output of the JK flip-flop 31. When the manual power switch 38 is turned on, the output waveform of the switch 38 and the input/output waveforms of the inverter circuit 39 are shown in FIGS. 3f, g, and h, respectively.

To determine how far away the user must be from the television receiver for the counter 29 to start counting, change the time constant of the MM 24 and adjust its output pulse.
You can set it freely by adjusting the width of _S5 . Also, the user can input the output pulse of MM24.
How much time has elapsed since the _distance determined by
Whether or not to turn off the power can be freely set by making the oscillation frequency of the oscillator 13 accurate and making the counter 29 programmable.

In FIG. 1, Vcc is a power source, 40 is an outlet connected to a commercial AC power source, 41 is a picture tube, 42 is a speaker, R is a resistor, and C is a capacitor.

According to this embodiment described in detail above, when the reflected wave from the user of the ultrasonic pulse _S3 ceases to exist within the period of the pulse _S5 , the pulse _S6 is counted by the counter 29, and a predetermined value is counted. If the reflected wave does not exist within the pulse _S5 again before counting, the power circuit 35 of the television receiver body 34 is turned off when the counter 29 counts a predetermined value. Therefore, even if the user forgets to turn off the power to the television receiver main body 34 and leaves the television receiver, it is possible to prevent the waste of electricity from causing a fire or the like.

In the previous embodiment, once the power supply circuit 35 was turned off, the television receiver main body 34 could not be turned on again without operating the manual power switch 38, but as shown in FIG. By connecting the output terminal of the AND circuit 27 to the set terminal S of the JK flip-flop 31, the power supply circuit 35 is automatically turned on when the user approaches the set distance for viewing the television receiver again. It is possible to do so.

Note that the present invention is not limited to the above embodiments, and for example, a time constant circuit may be used instead of the counter 29 as the control means. Furthermore, the so-called sensor for ultrasonic pulses may be one in which the speaker 11 and the microphone 12 are integrated.

As described above, according to the present invention, if the user remains away from the electrical device for a predetermined distance or more for a predetermined period of time or more, the power circuit of the electrical device is automatically turned off. Automatic power saving devices can be provided that can.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a first embodiment of the invention, FIGS. 2 a to m, and FIGS. 3 a to i are signal waveform diagrams for explaining the operation of the device in FIG. 1, and FIG. 4 FIG. 2 is a circuit diagram showing a second embodiment of the invention. 11... Ultrasonic speaker, 12... Ultrasonic microphone, 13, 15... Oscillator, 14, 22,
24, 25, 30...monostable multivibrator, 16...amplifier, 17...tuned circuit, 18...
...Diode, 19...Filter, 20...Schmitt trigger circuit, 21, 26, 27...AND circuit, 23...-Flip-flop, 31...
...JK-flip-flop, 32... Relay drive circuit, 33... Relay, 34... Television receiver body, 35... Power supply circuit, 38... Manual power switch, 39... Inverter circuit, R...
Resistance, C... capacitor.

Claims (1)

[Scope of Claims] 1. An oscillator that excites an ultrasonic speaker that emits ultrasonic waves toward a target object, an excitation period specifying means that specifies an excitation period of the oscillator, and an ultrasonic device that receives reflected waves from the target object. a sonic microphone; a mask pulse generation means for generating a pulse whose timing is defined by the excitation period setting means and which defines a period for sampling the reflected wave; and an output pulse of the mask pulse generation means and the reflected wave reception signal; The corresponding pulse is input,
a first AND operation means for performing an AND operation of both; and a first output whose output state changes complementarily according to the output of the first AND operation means and the signal of the excitation period setting means. a flip-flop having a terminal and a second output terminal; a separation distance setting means whose pulse width is defined according to the output pulse of the excitation period setting means and used to set a separation distance from the target object; and this separation distance. a second circuit for performing an AND operation between the output of the setting means and the first output of the flip-flop;
a counter which uses the output of the second AND calculation means as a clock and counts this clock a predetermined number of times and has a self-resetting function; an output side pulse of the second output terminal of the flip-flop; and means for generating a reset pulse for the counter by performing an AND operation with the output side pulse of the separation distance setting means; and power cutoff means for cutting off the power supply circuit of the device using the output of the counter. An automatic power saving device featuring: