JPS6113815A - Pyroelectric switch device - Google Patents

Abstract

PURPOSE:To improve the practicality and accurate load control by constituting the titled device of a pyroelectric sensor, a voltage detecting circuit outputting a signal when an absolute value of an output level is more than a reference level, a flip-flop circuit comprising two stages and a switching circuit responding to a flip-flop output of the 2nd stage of the circuit. CONSTITUTION:When a person accesses to a lighting fixture to light it and performs the lighting operation to the fixture, a flip-flop 14 of the 1st stage and a flip-flop 15 of the 2nd stage are both set, a switching circuit 17 are switched to turn on a light control circuit 18 and the lighting fixture is lighted. The flip- flop 14 of the 1st stage is reset immediately by the 2nd waveform signal generated at this time. Even when the flip-flop 14 is reset, however, the flip-flop 15 of the 2nd stage is not reset but keeps the set state. Thus, when the person accesses to the lighting fixture to light it and is parted from the place, the lighting fixture keeps the lighting state. Then the lighting operation of the lighting fixture is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pyroelectric switch device using a pyroelectric sensor.

[Technical Background of the Invention] Conventionally, as shown in FIG. 4, this type of pyroelectric switch device amplifies the output of a pyroelectric sensor 1 that senses changes in infrared rays with an amplifier circuit 2. Input the output to window comparator 3, and input the output to window comparator 3.
Compare with the upper limit level and lower limit level set in advance,
A signal is output from the comparator 3 when the input signal level is above the upper limit level and below the lower limit level, and the signal output at the upper limit level or above causes the switching circuit 4 having a timer function to perform a switching operation to control the load 5. One that operates for a certain period of time is known.

In this device, for example, when a person passes in front of the pyroelectric sensor 1, a signal with a waveform as shown in FIG. 5(a) is output, and a signal with a waveform as shown in FIG. Signals detected above a certain level and below a certain level are output, and a fifth signal is output when a signal detected above a certain level is output.
As shown in (C) of the figure, the switching circuit 4 is turned on,
Thereafter, when a certain period of time has elapsed, it is turned off to control the operation of the load 5 for a certain period of time.

[Problems with the background art] When applied to a load such as an automatic door where a person simply passes through, such a conventional device detects the approach of a person and opens the door, and detects when the person moves away. However, if such a switch device is applied to a home appliance, such as a lighting device, the following problem will occur. That is, a lighting device needs to be turned on and off at will, but there is a problem in that this cannot be done if the lighting device is turned on and then turned off after a certain period of time as described above. For this reason, we use a switching circuit 4 that does not have a timer function, and turns it on using the window comparator output.
It is conceivable to enable not only operation but also OFF operation, but if this is done simply, the illumination device will be turned on and off by a person's movement towards and away from the pyroelectric sensor 1.
0FFIlilJt! 0, so I turned on the lighting device.
The problem arises that the state cannot be maintained.

Based on this, the inventors inserted a two-stage flip-flop circuit between the window comparator and the switching circuit to turn on the load arbitrarily.

We have separately developed and applied for a device that can be turned off.

By the way, the window comparator uses two operational amplifiers 6.7 as shown in FIG.
An upper limit level signal is supplied to the inverting input terminal (-) of the other operational amplifier 7, and a lower limit level signal is supplied to the non-inverting input terminal (+) of the other operational amplifier 7. Since the configuration is such that the power is supplied to the non-inverting input terminal (+) and the inverting input terminal (=) of each operational amplifier 6.7, and the output of each operational amplifier 6.7 is output via the output terminal OUT, the comparison There are problems such as high cost and relatively high power consumption. Additionally, when a person approaches to operate a load, there is a risk that the pyroelectric sensor will detect the person's approach and output a signal, as well as detect the movement of the person's hand and output the signal again. However, in such a case, there is a problem in that if the switching circuit is operated twice, it may cause malfunction.

[Purpose of the Invention] This invention was devised to solve such problems, and allows the load to be turned on and off arbitrarily! 1JItl is possible,
It is an object of the present invention to provide a pyroelectric switch device that can be used in lighting devices, etc., improves practicality, and can perform reliable load control.

[Summary of the Invention] This invention compares the output of a pyroelectric sensor with a reference level set in advance by a voltage detection circuit, outputs a signal when the absolute value of the output level is equal to or higher than the reference level, and outputs a signal from the voltage detection circuit. The signal is supplied to a 70 flip-flop circuit consisting of two stages, and the switching circuit is operated by the output of the second stage 7 flip-flop circuit.

[Actual Examples of the Invention] Examples of the present invention will be described below with reference to the drawings. In this embodiment, the present invention will be described as applied to a lighting device.

Reference numeral 11 is attached to a lighting device, for example, a hanging lighting device, and detects changes in infrared rays due to the movement of a person near the device and the movement of a hand approaching the pyroelectric sensor installation part for lighting operation. This is an electroless sensor that outputs a waveform signal as shown in FIG. 3(a). The output signal of this pyroelectric sensor 11 is amplified by an amplifier circuit 12 and supplied to a voltage detection circuit 13. As shown in FIG. 2, the voltage detection circuit 13 consists of one operational amplifier 131, which supplies a reference level signal to its non-inverting input terminal (+) and also supplies the reference level signal to its inverting input terminal (-). It is configured to supply a signal from the amplifier circuit 12 via an input terminal IN, and output it from an output terminal of the operational amplifier 131 via an output terminal OUT. That is, the voltage detection circuit 13 compares the waveform signal from the pyroelectric sensor 11 with a preset reference level, and as shown in FIG. 3(b), when the absolute value of the signal level is equal to or higher than the reference level, That is, in this embodiment, a pulse signal is output when the absolute value of the negative level of the signal is equal to or higher than the reference level. The pulse signal from the voltage detection circuit 13 is supplied to the first stage 7 flip-flop 14 of a flip-flop circuit 16 consisting of a first stage 70 flip flop 14 and a second stage 70 flip flop 15. . As shown in FIG. 3C, the first stage 7-lip flop 14 is set at the rise of the first pulse signal from the voltage detection circuit 13, and reset at the rise of the next pulse signal.

The flip 70 knob 15 of the second stage is set at the rise of the set output signal from the flip 70 knob 14 of the first stage, and is reset at the rise of the next set output signal.

Then, the switching circuit 17 is turned on by the set output signal from the flip-flop 15 in the second stage to control the lighting of the lighting control circuit 18 which is the load, and the reset output from the 7-lip 70 knob 15 in the second stage is output. The switching circuit 17 is turned off by the signal, and the lighting control circuit 18 is turned off.
Control lights off.

In the device according to the embodiment of the present invention configured in this manner, a person approaches the lighting equipment, a hand approaches the pyroelectric sensor installation part for lighting operation, and a person moves away from the pyroelectric sensor 11. Accordingly, a plurality of waveform signals are output from the pyroelectric sensor, and when the absolute value of the negative level of the waveform signal exceeds a preset reference level, a pulse signal is output from the voltage detection circuit 13. Therefore,
For example, when a plurality of waveform signals as shown in FIG. 3(a) are output from the pyroelectric sensor 11, the voltage detection circuit 13
Two pulse signals as shown in FIG. 3(b) are output from the circuit. The first stage flip-flop 14 is set by the first of these two pulse signals, and reset by the next pulse signal. Further, by the setting operation of the first stage flip-flop 14, the second stage 7 flip-flop 15 is set as shown in FIG. 3(d). This second stage flip-flop 1
5 maintains its set state until the set output is input again from the first stage flip-flop 1-4. Therefore, when a person approaches the lighting equipment and performs the lighting operation on the lighting equipment, both the first stage flip 70 knob 14 and the second stage 7 lip 7O knob 15 are set. , the switching circuit 17 performs a switching operation, the lighting control circuit 18 turns ON, and the lighting equipment is turned on. The first stage 7 lip-flop 14 is immediately reset by the second waveform signal generated at this time. However, even if the first stage 7 flip-flop 14 is reset, the second stage flip-flop 15 is not reset and remains set. Therefore, even if a person approaches a lighting fixture, performs a lighting operation, and then leaves the area, the lighting fixture remains lit. In this way, the lighting operation of the lighting equipment can be performed reliably.

After that, if a person approaches the lighting equipment and approaches the installation part of the pyroelectric sensor in order to turn off the lighting equipment, the non-electroelectric sensor 11 will move as shown in FIG. Multiple waveform signals are output. However,
Two pulse signals are output from the voltage detection circuit 13, the first stage flip-flop 14 is set by the first pulse signal, and the flip-flop 15 at the second stage is reset by this set output. The first stage flip-flop 14 is immediately reset by the second waveform signal generated at this time. In this way, the switching circuit 17 is turned off by resetting the second stage flip-flop 15.
F operates and the lighting equipment is turned off.

In this way, a person can turn on or turn off a lighting fixture by approaching the lighting fixture at any time, and can control the blinking of the lighting fixture as desired. Furthermore, even if multiple waveform signals are generated from the pyroelectric sensor 11, the voltage detection circuit 13 and the two-stage flip 70 tube circuit 16 can ensure that the switching circuit 17 is operated only once, causing the lighting equipment to blink. Control can be ensured. Furthermore, unlike the window comparator, the voltage detection circuit 13 only needs one operational amplifier, which can reduce costs and save power.

In the above embodiment, the signal from the pyroelectric sensor 11 is supplied to the inverting input terminal (=) of the operational amplifier 131, the reference level signal is supplied to the non-inverting input terminal (+), and the negative level or absolute value of the signal is Although we have described a device that outputs a pulse signal when A pulse signal may be output when the level is equal to or higher than a reference level.

Further, although the above embodiment describes the application of the present invention to a lighting device as a load, the present invention is not necessarily limited to this, and can be applied to other home appliances such as televisions, as well as various electrical devices using a switch mechanism. It can also be applied to

[Effects of the Invention] As detailed above, according to the present invention, the load can be arbitrarily reduced.
It is possible to provide a pyroelectric switch device that can perform N/OFF control, can be used for lighting devices, etc., can improve practicality, and can perform reliable load control.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific configuration of the voltage detection circuit in FIG. 1, FIG. 3 is an output waveform diagram of each part in FIG. 1, and FIG. 5 is a block diagram showing a conventional example, FIG. 5 is an output waveform diagram of each part in FIG. 4, and FIG. 6 is a circuit diagram showing a specific configuration of the window comparator in FIG. 4. 11... Pyroelectric sensor, 13... Voltage detection circuit, 1
6...Flip-flop circuit, 17...Switching circuit.

Claims (1)

[Claims] A pyroelectric sensor, a voltage detection circuit that compares the output of this pyroelectric sensor with a preset reference level and outputs a signal when the absolute value of the output level is greater than or equal to the reference level, and a signal output from this voltage detection circuit. A flip-flop circuit consisting of two stages that responds to
A pyroelectric switch device consisting of a switching circuit that responds to the output of a flip-flop in the first stage.