A kind of presence type pyroelectric infrared induction switch

Abstract

The present invention discloses a presence type pyroelectric infrared induction switch, comprising a first pyroelectric infrared sensor and a second pyroelectric infrared sensor, an infrared chopping modulation device is arranged in front of the second pyroelectric infrared sensor, a plurality of windows are arranged on the infrared chopping modulation device, the infrared chopping modulation device is connected to a driving mechanism, the driving mechanism can drive the infrared chopping modulation device to move, the second pyroelectric infrared sensor corresponds to the movement tracks of the plurality of windows, and the second pyroelectric infrared sensor and the first pyroelectric infrared sensor are both electrically connected to the driving mechanism. After the first pyroelectric infrared sensor detects an infrared signal, the infrared chopping modulation device is started, and through the movement of the infrared chopping modulation device, the second pyroelectric infrared sensor can detect the pulsating infrared signal through the window, so that the pyroelectric infrared induction switch can continue to work, even if the human body entering the sensing range of the pyroelectric infrared sensor is in a stationary state.

Description

Technical Field

[0001] The invention relates to a pyroelectric infrared induction switch, in particular to an existence type pyroelectric infrared induction switch. Background Art

[0002] The pyroelectric infrared induction switch is an automatic control switch based on infrared induction technology. It realizes its automatic control function by sensing the infrared heat of the human body through the pyroelectric infrared sensor. It can quickly turn on various electrical equipment such as lamps, automatic doors, burglar alarms, etc., bringing a lot of convenience to people's daily work and life.

[0003] However, due to the physical characteristics of pyroelectric infrared sensors and the design technology of existing products, the existing pyroelectric infrared induction switches have certain deficiencies in use. When the pyroelectric infrared induction switch detects the heat of human movement, it can only keep it working for a period of time by setting a delay circuit in the circuit processing. When the human body is stationary in front of the pyroelectric infrared sensor, the pyroelectric infrared induction switch will stop working after the delay, and it is impossible to keep working for a long time when the human body is stationary. This brings a lot of inconvenience in practical applications, such as causing certain misjudgments and false alarms in anti-theft alarms. Summary of the invention

[0004] In order to solve the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a presence-type pyroelectric infrared sensing switch, which performs infrared chopping modulation on the infrared heat of the human body within the detection range, realizes active scanning of the infrared heat of the human body, and ensures that the pyroelectric infrared sensing switch can work for a long time until the human body leaves the detection range of the pyroelectric infrared sensor.

[0005] In order to achieve the above-mentioned purpose, the present invention is designed to provide a presence type pyroelectric infrared sensing switch, including a first pyroelectric infrared sensor and a second pyroelectric infrared sensor, wherein an infrared chopping modulation device is provided in front of the second pyroelectric infrared sensor, wherein a plurality of windows are provided on the infrared chopping modulation device, wherein the infrared chopping modulation device is connected to a driving mechanism, wherein the driving mechanism can drive the infrared chopping modulation device to move, wherein the second pyroelectric infrared sensor corresponds to the movement trajectory of the plurality of windows, and the second pyroelectric infrared sensor and the first pyroelectric infrared sensor are both electrically connected to the driving mechanism.

[0006] Preferably, the second pyroelectric infrared sensor corresponds to the movement trajectory of the window center.

[0007] Preferably, the infrared chopper modulation device is a plate body, a plurality of windows are provided on the plate body, the centers of the plurality of windows are located on the same straight line, and the infrared chopper modulation device can perform linear reciprocating motion relative to the second pyroelectric infrared sensor.

[0008] Preferably, the infrared chopping modulation device is a plate body, a plurality of windows are provided on the plate body, the centers of the plurality of windows are located on the same circular line, and the infrared chopping modulation device can rotate relative to the second pyroelectric infrared sensor.

[0009] Preferably, the driving mechanism is a stepping motor.

[0010] Preferably, the first pyroelectric infrared sensor and the second pyroelectric infrared sensor are located in different lenses respectively, and the infrared chopping modulation device and the second pyroelectric infrared sensor are located in the same lens.

[0011] Compared with the prior art, the beneficial effect of the present invention is that after the first pyroelectric infrared sensor detects the infrared signal of the human body, the infrared chopping modulation device is started to move. Through the movement of the infrared chopping modulation device, the second pyroelectric infrared sensor can detect the pulsating infrared signal through the window, so that the pyroelectric infrared sensing switch can continue to work, even if the human body entering the detection range of the pyroelectric infrared sensor is in a stationary or immobile state. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention.

[0013] Figure 2 It is another structural schematic diagram of the present invention.

[0014] Figure 3 It is a circuit schematic diagram of the pyroelectric infrared sensor in the present invention.

[0015] Figure 4 It is a circuit principle diagram of the infrared carrier modulation device and the driving mechanism of the present invention.

[0016] Figure 5 It is another circuit principle diagram of the infrared carrier modulation device and the driving mechanism in the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] like Figure 1 , 2As shown, a presence type pyroelectric infrared sensing switch includes a first pyroelectric infrared sensor 1, a second pyroelectric infrared sensor 2 and an infrared chopping modulation device. The infrared chopping modulation device is located in front of the second pyroelectric infrared sensor 2 and can move relative to the second pyroelectric infrared sensor 2. A plurality of windows 3 are provided on the infrared chopping modulation device. The second pyroelectric infrared sensor 2 and the movement trajectories of the plurality of windows 3 are opposite. The infrared chopping modulation device will not block the first pyroelectric infrared sensor 1 whether in a moving state or a stationary state, thereby ensuring the effective detection range of the first pyroelectric infrared sensor 1.

[0019] The first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 are respectively located in two different lenses, and the infrared chopping modulation device must be located in the same lens as the second pyroelectric infrared sensor 2. The first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 can be distributed horizontally, vertically, or at other angles, and the detection ranges of the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 overlap.

[0020] In order to facilitate the movement of the infrared chopping modulation device, the infrared chopping modulation device is connected to a driving mechanism, and the driving mechanism is electrically connected to the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 respectively.

[0021] When a human body enters the detection range of the first pyroelectric infrared sensor 1, the first pyroelectric infrared sensor 1 sends an electrical signal to the load and the driving mechanism, the load works, and the driving mechanism drives the infrared chopping modulation device to move. At this time, the human body moves within the detection range of the first pyroelectric infrared sensor 1, and the first pyroelectric infrared sensor 1 can always sense the infrared signal of the human body to keep the load working. At the same time, the second pyroelectric infrared sensor 1 also detects the pulsating infrared signal through the window 3 during the movement of the infrared chopping modulation device, and also sends an electrical signal to the load and the driving mechanism. In this process, the human body walks out of the detection range of the first pyroelectric infrared sensor, the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 stop sending signals, the load and the driving mechanism stop working, and the infrared chopping modulation device stops. Stop movement; when the human body is stationary within the detection range of the first pyroelectric infrared sensor 1, the first pyroelectric infrared sensor 1 starts the driving mechanism after detecting the infrared heat, and stops sending electrical signals to the load and the driving mechanism after the delay. During the movement process of the infrared chopping modulation device corresponding to the delay, since the movement trajectories of the second pyroelectric infrared sensor 2 and the window 3 are relative, the second pyroelectric infrared sensor 2 can detect the pulsating infrared signal through the window 3, and the second pyroelectric infrared sensor 2 sends an electrical signal to the driving mechanism and the load. The driving mechanism continues to drive the infrared chopping modulation device to continue moving, and the load continues to work. Until the second pyroelectric infrared sensor 2 and the first pyroelectric infrared sensor 1 do not detect the infrared signal, the driving mechanism and the load stop working and wait for the next infrared signal to enter.

[0022] The first pyroelectric infrared sensor 1 is responsible for starting the driving mechanism and the load. The window 3 of the infrared chopping modulation device cuts the infrared signal entering the second pyroelectric infrared sensor 2, so that the second pyroelectric infrared sensor 2 actively scans the infrared signal within its detection range. Even if the human body is in a stationary state, the second pyroelectric infrared sensor 2 can still detect the pulsating infrared signal, ensuring the continuous operation of the load. The infrared chopping modulation device moves under the action of the driving mechanism. When the first pyroelectric infrared sensor and the second pyroelectric infrared sensor are unable to detect the infrared signal of the human body, the infrared chopping modulation device stops moving. It is very likely that the second pyroelectric infrared sensor will not correspond to the window. Since the first pyroelectric infrared sensor 1 is responsible for starting the driving mechanism and the load, it will not affect the detection of the next infrared signal.

[0023] In order to better control the movement of the infrared chopper modulation device, the driving mechanism is preferably a stepping motor.

[0024] The infrared chopper modulation device is a plate body, which can be a square plate 4, such as Figure 1As shown, the square plate 4 is provided with a plurality of evenly distributed windows 3, the centers of the plurality of windows 3 are located on the same straight line, the sizes of the plurality of windows 3 can be equal or unequal, and the infrared chopping modulation device can perform linear reciprocating motion relative to the second pyroelectric infrared sensor 2.

[0025] The plate body may also be a disk 5, such as Figure 2 As shown, the disk 5 is provided with a plurality of windows 3, the centers of the plurality of windows 3 are located on the same circumference, the plurality of windows 3 are evenly distributed on the same circumference, and the infrared chopping modulation device can rotate relative to the second pyroelectric infrared sensor 2.

[0026] In order to ensure that the detection of the second pyroelectric infrared sensor 2 is not blocked, the second pyroelectric infrared sensor 2 is aligned with the movement trajectory of the center of the window 3 .

[0027] like Figure 3 As shown, attached Figure 3 This is a circuit schematic diagram of the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 in the present invention. The first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 are arranged in parallel. The operating principles of the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 are the same as those of the prior art and will not be described in detail herein. Figure 4 , 5 As shown, attached Figure 4 , 5 The following are two circuit schematics of the infrared carrier modulation device and the driving mechanism of the present invention. Figure 4 Port 1 in C4 or the attached Figure 5 The C4 ports 1 and 4 in the Figure 3 The 6-pin OUT of the IC1 chip is electrically connected and used for inputting the infrared signals detected by the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 .

[0028] The working principle of the existing pyroelectric infrared induction switch is as follows: when the pyroelectric infrared induction switch is powered on, the IC1 chip enters the initialization, the IC1 chip outputs a high level, the relay is attracted or the thyristor is turned on to make the load work, and the drive mechanism is also operated to drive the infrared chopper modulation device to move. When the IC1 chip is initialized, the IC1 chip outputs a low level, the relay or thyristor loses power and stops supplying power to the load, and at the same time, the drive mechanism also stops working, and the entire pyroelectric infrared induction switch enters the standby state, waiting for the human body heat to enter the detection range of the pyroelectric infrared sensor again.

[0029] When the human body enters the detection range of the pyroelectric infrared sensor, the first pyroelectric infrared sensor first detects the moving heat of the human body. At this time, the first pyroelectric infrared sensor outputs a low-frequency pulsating voltage to the IC1 chip. After being processed by the amplification delay circuit, the IC1 chip outputs a high level, and the relay is energized or the thyristor is opened to power the load. At the same time, the high level of the IC1 chip allows the drive mechanism to work, driving the infrared chopping modulation device to move, modulating the static heat of the human body, and allowing the second pyroelectric infrared sensor to output a low-frequency pulsating voltage to the IC1 chip. It is necessary to ensure that the pulsating frequency time output by the second pyroelectric infrared sensor to the IC1 chip is higher than the delay time. After the delay circuit, the IC1 chip maintains an output high level, the relay remains energized or the thyristor remains open to power the load. At the same time, the high level allows the drive mechanism to drive the infrared chopping modulation device to continuously perform infrared chopping modulation. The second pyroelectric infrared sensor will continuously output a low-frequency pulsating voltage, which forms a closed-loop working mode after being processed by the IC1 chip circuit, allowing the pyroelectric infrared sensing switch to maintain long-term operation. When the human body heat leaves the detection area of ​​the pyroelectric infrared sensor, the second pyroelectric infrared sensor stops outputting low-frequency pulsating voltage. After a delay, the IC1 chip outputs a low level, and the relay or thyristor loses power and stops supplying power to the load. At the same time, the driving mechanism also stops working. At this time, the pyroelectric infrared sensing switch enters the standby state and waits for the next entry of the human body heat source.

[0030] The following is attached Figure 4 Combined with Figure 3 Take the example of the operation of the existing pyroelectric infrared sensor switch to explain in detail. Figure 4 Port 1 in C4 of the attached Figure 3 The 6-pin OUT of the IC1 chip is electrically connected to the input of the infrared signal detected by the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2. When the AC power supply is connected and the voltage is stepped down, the power supply outputs DC12V, which supplies power to U1 and U2, and also supplies power to the IC3CPU driver chip. After passing through U1, the DC12V outputs DC2.5V to power the IC1 chip and the first pyroelectric infrared sensor and the second pyroelectric infrared sensor, and after passing through U2, the DC12V outputs DC5V to Figure 4The IC2CPU chip in the power supply. At this time, the IC1 chip enters the work initialization, the 6-pin of the IC1 chip outputs a high level and is connected to the base of Q1 through R7 to attract the relay to work for the load. At the same time, the 6-pin of the IC1 chip is connected to the base of Q2 through the diode D3 and the resistor R10. The collector of Q2 is connected to the resistor R9 to +5V. Because the base of Q2 is high, the collector of Q2 flips to a low level and is connected to the 9-pin (Pi In2) of the IC2CPU chip. The 9-pin of the IC2 CPU chip is low. Pin 2 (PoMOT1) of IC2CPU chip is connected to pin 2 (Po MOT1) of IC3CPU driver chip, pin 1 (PoMOT2) of IC2CPU chip is connected to pin 3 (Po MOT2) of IC3CPU driver chip, pin 14 (PoMOT3) of IC2CPU chip is connected to pin 4 (PoMOT3) of IC3CPU driver chip, pin 13 (PoMOT4) of IC2CPU chip is connected to pin 5 (PoMOT4) of IC3CPU driver chip, and pins 9, 12, 13, 14 and 15 of IC3CPU driver chip are connected to stepper motor 6. When pin 9 of IC2CPU chip is set to low level, IC3CPU driver chip can be operated, and the stepper motor starts to drive the infrared chopper device to move together. When IC1 chip is initialized, pin 6 of IC1 chip outputs low level, and Q1 releases relay to stop supplying power to the load. When the 6th pin of IC1 is at a low level, the collector of Q2 turns to a high level, and the 9th pin of IC2CPU also turns to a high level. When IC2CPU is set to a low level, the IC3CPU driver chip can work. Therefore, when the 9th pin of IC2CPU is at a high level, the IC3CPU driver chip stops working, the stepper motor 6 stops rotating, and the pyroelectric infrared sensor switch enters the standby state.

[0031] When human infrared heat enters the detection working area of ​​the pyroelectric infrared induction switch in standby mode, the first pyroelectric infrared sensor 1 detects the human infrared heat when moving in first, and the S pole of the first pyroelectric infrared sensor outputs a low-frequency pulsating voltage to the 2nd pin of the IC1 chip. The 6th pin of the IC1 chip outputs a high level, which is connected to the base of Q1 through R7 to attract the relay to power the load. At the same time, the 6th pin of the IC1 chip is connected to the base of Q2 through the diode D3 resistor R10, and the collector of Q2 is turned to a low level and connected to the 9th pin of the IC2CPU chip. When the 9th pin of the IC2 CPU chip is set to a low level, the IC3CPU driver chip can be turned on to power the stepper motor. The stepper motor drives the infrared carrier modulation device to move and modulate the infrared heat of the stationary or moving human body. At this time, the S pole of the second pyroelectric infrared sensor continuously outputs a low-frequency pulsating voltage to the 2nd pin of the IC1 chip. The 6th pin of the IC1 chip outputs a high level, which is connected to the base of Q1 through the resistor R7 to attract the relay to power the load. At the same time, the 6th pin of IC1 chip is connected to the base of Q2 through diode D3 and resistor R10, and the collector of Q2 flips to low level and is connected to the 9th pin of IC2CPU chip. Since IC1 chip has a delay setting, as long as the time when the second pyroelectric infrared sensor outputs low-frequency pulsation frequency is higher than the set delay time of IC1 chip, the 6th pin of IC1 chip will remain high level, the 9th pin of IC2CPU chip will remain low level, and the IC3CPU driver chip will drive the stepper motor and infrared carrier modulation device to move, and the entire pyroelectric infrared induction switch will enter the closed-loop mode and stably enter the long-term working state. When the human infrared heat source leaves the detection working area of ​​the pyroelectric infrared sensor, the pyroelectric infrared induction switch will re-enter the standby working state.

Claims

1. A presence type pyroelectric infrared induction switch, comprising a first pyroelectric infrared sensor, characterized in that: It also includes a second pyroelectric infrared sensor, wherein an infrared chopping modulation device is provided in front of the second pyroelectric infrared sensor, a plurality of windows are provided on the infrared chopping modulation device, the infrared chopping modulation device is connected to a driving mechanism, the driving mechanism can drive the infrared chopping modulation device to move, the second pyroelectric infrared sensor corresponds to the movement tracks of the plurality of windows, and the second pyroelectric infrared sensor and the first pyroelectric infrared sensor are both electrically connected to the driving mechanism; The first pyroelectric infrared sensor and the second pyroelectric infrared sensor are arranged in parallel, and the first pyroelectric infrared sensor and the second pyroelectric infrared sensor are electrically connected to the IC1 chip respectively, the IC1 chip is electrically connected to the load through Q1, the IC1 chip is electrically connected to the base of Q2, the collector of Q2 is electrically connected to the IC2CPU chip, the IC2CPU chip is electrically connected to the IC3CPU driver chip, and the IC3CPU driver chip controls the driving mechanism; When the first pyroelectric infrared sensor detects infrared heat from the human body, it outputs a low-frequency pulsating voltage to the IC1 chip, and the IC1 chip outputs a high level to power the load, and at the same time transmits a high level to the base of Q2, and the collector of Q2 flips to a low level and transmits it to the IC2CPU chip. After receiving the low level, the IC2CPU chip turns on the IC3CPU driver chip to power the drive mechanism, and the drive mechanism drives the infrared carrier modulation device to move, and modulates the infrared heat of the stationary or moving human body. At this time, the second pyroelectric infrared sensor also detects the infrared heat from the human body, and continuously outputs a low-frequency pulsating voltage to the IC1 chip to ensure that the IC1 chip continuously outputs a high level, wherein the time of the low-frequency pulsating frequency output by the second pyroelectric infrared sensor after sensing the infrared heat from the human body is higher than the delay time set in the IC1 chip.

2. The presence type pyroelectric infrared induction switch according to claim 1, characterized in that: The second pyroelectric infrared sensor corresponds to the movement trajectory of the window center.

3. The presence type pyroelectric infrared induction switch according to claim 1, characterized in that: The infrared chopping modulation device is a plate body, and a plurality of windows are arranged on the plate body. The centers of the plurality of windows are located on the same straight line. The infrared chopping modulation device can perform linear reciprocating motion relative to the second pyroelectric infrared sensor.

4. The presence type pyroelectric infrared induction switch according to claim 1, characterized in that: The infrared chopping modulation device is a plate body, and a plurality of windows are arranged on the plate body. The centers of the plurality of windows are located on the same circumference line. The infrared chopping modulation device can rotate relative to the second pyroelectric infrared sensor.

5. The presence type pyroelectric infrared induction switch according to claim 1, characterized in that: The driving mechanism is a stepping motor.

6. The presence type pyroelectric infrared induction switch according to claim 1, characterized in that: The first pyroelectric infrared sensor and the second pyroelectric infrared sensor are respectively located in different lenses, and the infrared chopping modulation device and the second pyroelectric infrared sensor are located in the same lens.

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