CN115079290A - Human body infrared detection white light interference resisting circuit and method and human body infrared detector - Google Patents
Human body infrared detection white light interference resisting circuit and method and human body infrared detector Download PDFInfo
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Abstract
The application relates to a human body infrared detection white light interference resistant circuit, a human body infrared detection white light interference resistant method and a human body infrared detector, which relate to the technical field of human body infrared detection and comprise an infrared detection module, a control module and a light intensity identification module; the output end of the infrared detection module is connected to the input end of the control module, the enable end of the control module is connected to the input end of the light intensity identification module, the output end of the light intensity identification module is connected to the input end of the control module, and the output end of the control module is connected to the control device; the infrared detection module is used for detecting whether an infrared signal is received or not; the control module is used for receiving the trigger signal and sending an enabling signal to the light intensity identification module; the light intensity identification module is used for detecting the illumination intensity of the white light after receiving the enabling signal and outputting a first electric signal according to the illumination intensity of the white light; the control module is used for judging whether strong light interference exists according to the first electric signal output by the light intensity identification module. The application has the effect of reducing interference of strong light to the human body infrared detector.
Description
Technical Field
The application relates to the technical field of human body infrared detection, in particular to a human body infrared detection white light interference resisting circuit and method and a human body infrared detector.
Background
The human body infrared detector detects whether a human body passes through the infrared detector by detecting infrared rays emitted by the human body, the human body infrared detector receives external infrared signals through the lens and then gathers the received infrared signals onto the infrared sensor, the infrared sensor converts the received infrared signals into electric signals, and the human body infrared detector gives an alarm or controls related devices to act according to the electric signals.
The normal temperature of a human body is 36-37 ℃, the wavelength of infrared rays emitted by the human body is 9-10 microns at the moment, the wavelength of white light is 350-770 nm, when the intensity of the white light reaches a certain value and becomes strong light, the strong light can also penetrate through an optical filter of the sensor to generate interference on the radiation of the photosensitive element, and at the moment, if no human body passes through the human body infrared detector, the strong light interferes with the human body infrared detector, so that the detection accuracy of the human body infrared detector is improved, and false alarm or false triggering control action and other conditions can be caused.
Disclosure of Invention
In order to reduce interference of strong light to a human body infrared detector, the application provides a human body infrared detection white light interference resisting circuit and method and a human body infrared detector.
In a first aspect, the present application provides a human infrared detection white light interference resistant circuit, which adopts the following technical scheme:
a human body infrared detection white light interference resistant circuit comprises an infrared detection module, a control module and a light intensity identification module; the output end of the infrared detection module is connected to the input end of the control module, the enable end of the control module is connected to the input end of the light intensity identification module, the output end of the light intensity identification module is connected to the input end of the control module, and the output end of the control module is connected to the control device;
the infrared detection module is used for detecting whether an infrared signal is received or not, and if so, sending a trigger signal to the control module;
the control module is used for receiving the trigger signal and sending an enabling signal to the light intensity identification module;
the light intensity identification module is used for detecting the illumination intensity of the white light after receiving the enabling signal and outputting a first electric signal according to the illumination intensity of the white light;
the control module is also used for judging whether strong light interference exists according to the first electric signal output by the light intensity identification module, and if the strong light interference exists, resetting the control module and re-receiving the trigger signal; and if no strong light interference exists, the control module generates a control instruction and sends the control instruction to a corresponding control device.
Through adopting above-mentioned technical scheme, when infrared detection module received infrared signal, infrared detection module sends trigger signal to control module, control module is according to received trigger signal, to light intensity identification module transmission enable signal, light intensity identification module is according to received enable signal, illumination intensity to white light detects, and output first signal of telecommunication, then control module judges whether there is strong light interference according to the first signal of telecommunication of receipt, when there is strong light interference, reset control module, receive trigger signal again, thereby discharge strong light interference, when there is not strong light interference, control module sends control command to response control device, thereby human infrared detector's accuracy has been improved.
Optionally, the infrared detection module includes an infrared acquisition submodule, an amplification submodule and a judgment submodule; the output end of the infrared acquisition submodule is connected to the input end of the amplification submodule, the output end of the amplification submodule is respectively connected to the input end of the control module and the input end of the judgment submodule, and the output end of the judgment submodule is connected to the input end of the control module;
the infrared acquisition submodule is used for acquiring an infrared signal, converting the infrared signal into a second electric signal and transmitting the second electric signal to the amplification submodule;
the amplifying submodule is used for receiving the second electric signal and amplifying the second electric signal to obtain a third electric signal; transmitting the third electrical signal to a comparison sub-module;
the judging submodule is used for receiving the third electric signal and judging whether the voltage of the third electric signal is in a preset voltage range, and if not, a triggering signal is sent to the control module.
By adopting the technical scheme, the infrared acquisition submodule acquires an infrared signal, converts the infrared signal into a second electric signal, inputs the second electric signal to the amplification submodule, amplifies the second electric signal by the amplification submodule to obtain a third electric signal, inputs the third electric signal to the judgment submodule, judges whether the voltage of the third electric signal is in a preset voltage range by the judgment submodule, and if so, indicates that the infrared signal is received.
Optionally, the amplifier sub-module includes a plurality of amplifier sub-modules, an input end of the amplifier sub-module is connected to an output end of the infrared acquisition sub-module, and output ends of the amplifier sub-modules are respectively connected to an input end of the control module and an input end of the judgment sub-module.
By adopting the technical scheme, the plurality of amplification sub-modules amplify the first electric signal in multiple stages, so that the third electric signal received by the judgment sub-module is more stable and is not distorted.
Optionally, the light intensity identification module comprises a light intensity detection submodule; the light intensity detection submodule is connected with the control module;
the light intensity detection submodule is used for detecting the illumination intensity of the white light according to the enabling signal, converting the illumination intensity of the strong light into a first electric signal and inputting the first electric signal to the control module.
By adopting the technical scheme, when the light intensity detection submodule receives the enabling signal, the illumination intensity of the white light is detected, and the illumination intensity of the white light is converted into the first electric signal, so that the control module detects whether the white light interference exists according to the first electric signal.
Optionally, the light intensity identification module further includes a conversion sub-module, an input end of the conversion sub-module is connected to the light intensity detection sub-module, an output end of the conversion sub-module is connected to an input end of the control module, and an input end of the conversion sub-module is further connected to an enable end of the control module;
the conversion submodule is used for converting the first electric signal into a digital signal and outputting the digital signal to the control module.
Through adopting above-mentioned technical scheme, convert first signal of telecommunication into digital signal, whether can more audio-visual judgement have highlight interference, it is more convenient.
Optionally, the conversion submodule includes a MOS transistor Q1, the gate of the MOS transistor Q1 is connected to the light intensity detection submodule, the drain of the MOS transistor Q1 is connected to the enable end EN of the control module, the source of the MOS transistor Q1 is connected to the ground end GND, and the drain of the MOS transistor Q1 is further connected to the input end of the control module.
Through adopting above-mentioned technical scheme, when the voltage of light intensity detection submodule piece was greater than the turn-on voltage of MOS pipe, the level of MOS pipe Q1 drain electrode was the low level, when the voltage of light intensity detection submodule piece was less than the turn-on voltage of MOS pipe Q1, the level of MOS pipe Q1 drain electrode was the high level, can learn whether have the highlight interference through the wave form of high-low level, and then whether more simple and convenient judgement exists the highlight interference.
Optionally, the circuit further includes a power supply module, an input end of the power supply module is connected to a power supply, and an output end of the power supply module is respectively connected to the power end of the amplification submodule and the power end of the judgment submodule.
In a second aspect, the present application provides a method for anti-white light interference in human infrared detection, which adopts the following technical scheme:
a human body infrared detection white light interference resisting method, which is applied to the human body infrared detection white light interference resisting circuit according to the first aspect, the method comprising:
the infrared detection module detects whether an infrared signal is received;
if yes, the infrared detection module sends a trigger signal to the control module;
the control module sends an enabling signal to the light intensity identification module according to the trigger signal;
the light intensity identification module detects the illumination intensity of the white light according to the enabling signal and generates a detection result;
the control module judges whether strong light interference exists according to the detection result;
if the strong light interference exists, the control module controls the infrared detection module to detect the infrared signal again;
and if no strong light interference exists, the control module generates a control instruction and sends the control instruction to a corresponding control device.
Through adopting above-mentioned technical scheme, when infrared detection module received infrared signal, infrared detection module sends trigger signal to control module, control module is according to received trigger signal, to light intensity identification module transmission enable signal, light intensity identification module is according to received enable signal, illumination intensity to white light detects, and output first signal of telecommunication, then control module judges whether there is strong light interference according to the first signal of telecommunication of receipt, when there is strong light interference, reset control module, receive trigger signal again, thereby discharge strong light interference, when there is not strong light interference, control module sends control command to response control device, thereby human infrared detector's accuracy has been improved.
In a third aspect, the present application provides a human body infrared detector, which adopts the following technical scheme:
a human body infrared detector comprises the human body infrared detection white light interference resisting circuit
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the infrared detection module receives an infrared signal, the infrared detection module sends a trigger signal to the control module, the control module transmits an enabling signal to the light intensity identification module according to the received trigger signal, the light intensity identification module detects the illumination intensity of white light according to the received enabling signal and outputs a first electric signal, then the control module judges whether strong light interference exists or not according to the received first electric signal, when the strong light interference exists, the control module is reset, the trigger signal is received again, so that the strong light interference is discharged, and when the strong light interference does not exist, the control module sends a control instruction to the response control device, so that the accuracy of the human body infrared detector is improved;
2. the infrared acquisition submodule acquires an infrared signal, converts the infrared signal into a second electric signal and inputs the second electric signal to the amplification submodule, the amplification submodule amplifies the second electric signal to obtain a third electric signal, inputs the third electric signal to the judgment submodule, and then the judgment submodule judges whether the voltage of the third electric signal is within a preset voltage range, if so, the infrared signal is received;
3. when the light intensity detection submodule receives the enabling signal, the illumination intensity of the white light is detected, and the illumination intensity of the white light is converted into a first electric signal, so that the control module detects whether white light interference exists or not according to the first electric signal.
Drawings
Fig. 1 is a block diagram of a human infrared detection white light interference resistant circuit in an embodiment of the present application.
Fig. 2 is a block diagram of an infrared detection module in the embodiment of the present application.
Fig. 3 is a schematic circuit diagram of an infrared acquisition submodule in an embodiment of the present application.
Fig. 4 is a schematic circuit diagram of the amplifier sub-module and the judgment sub-module in the embodiment of the present application.
Fig. 5 is a block diagram for showing the structure of the light intensity device module in the embodiment of the present application.
Fig. 6 is a schematic circuit diagram of the light intensity identification module in the embodiment of the present application.
Fig. 7 is a block diagram illustrating a connection relationship between power supply modules according to an embodiment of the present application.
Fig. 8 is a schematic circuit diagram of a first power supply module in an embodiment of the present application.
Fig. 9 is a schematic circuit diagram of a second power supply module in the embodiment of the present application.
Fig. 10 is a schematic circuit diagram of a third power supply module in the embodiment of the present application.
Fig. 11 is a schematic circuit diagram of a power supply module in an embodiment of the present application.
FIG. 12 is a schematic flow chart illustrating a method for white light interference resistance in human infrared detection according to an embodiment of the present application
Description of reference numerals: 1. an infrared detection module; 11. an infrared acquisition submodule; 12. an amplification submodule; 121. a first amplifying unit; 122. a second amplifying unit; 13. a judgment submodule; 131. a first comparing unit; 132. a second comparing unit; 2. a control module; 3. a light intensity identification module; 31. a light intensity detection submodule; 32. a conversion submodule; 4. a power supply module; 41. a first power supply module; 42. a second power supply module; 43. and a third power supply module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-12 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application discloses a human body infrared detection white light interference resisting circuit. Referring to fig. 1, the human body infrared detection white light interference resisting circuit comprises an infrared detection module 1, a control module 2, a light intensity identification module 3 and a power supply module 4; the output of infrared detection module 1 is connected in control module 2's input, control module 2's enable end is connected in light intensity identification module 3's input, light intensity identification module 3's output is connected in control module 2's input, control module 2's output is connected in the controlling means, power module 4's input is connected in the power end VCC, power module 4 connects respectively in amplifier submodule 12 and judgement submodule 13.
Referring to fig. 1 and fig. 2, as an alternative implementation manner of this embodiment, the infrared detection module 1 includes an infrared acquisition sub-module 11, an amplification sub-module 12, and a judgment sub-module 13; the output of infrared collection submodule 11 is connected to the input of amplifier submodule 12, the output of amplifier submodule 12 is connected to the input of control module 2 and the input of judging submodule 13 respectively, and the output of judging submodule 13 is connected to the input of control module 2.
Referring to fig. 3, in the present alternative embodiment, the infrared collection sub-module 11 includes an infrared sensor PIR, a capacitor C1, a resistor R2, a resistor R1, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C11, and a signal output terminal PIR _ SINGLE; the 1 pin of the infrared sensor PIR is connected to one end of a resistor R2, the other end of a resistor R2 is connected to one end of a resistor R1, the other end of the resistor R1 is connected to a power supply terminal VCC, the connection point of the resistor R2 and the resistor R1 is further connected to one end of a capacitor C8, the other end of the capacitor C8 is connected to a ground terminal GND, two ends of the capacitor C11 are respectively connected in parallel to two ends of a capacitor C8, the pin 1 of the infrared sensor PIR is further connected to one end of a capacitor C6 and one end of a capacitor C7, the other end of the capacitor C6 and the other end of the capacitor C7 are both connected to the ground terminal GND, the pin 2 of the infrared sensor PIR is connected to a signal output terminal PIR _ SINGLE, the signal output terminal PIR _ SINGLE is connected to the input terminal of the amplification sub-module 12, the pin 3 of the infrared sensor PIR is connected to the ground terminal GND and one end of the capacitor C1, and the other end of the capacitor C1 is connected to the pin 2 of the infrared sensor PIR.
When infrared sensor PIR gathers infrared signal, power end VCC provides power supply for infrared sensor PIR, then infrared sensor PIR converts the infrared signal who gathers into the second signal of telecommunication, then inputs the second signal of telecommunication to amplification submodule 12 through signal output end PIR _ SINGLE, and amplification submodule 12 amplifies the second signal of telecommunication.
Referring to fig. 4, in the present embodiment, the amplification sub-module 12 includes two amplification units, the two amplification units are a first amplification unit 121 and a second amplification unit 122, respectively, an input end of the first amplification unit 121 is connected to an output end of the infrared acquisition sub-module 11, an output end of the first amplification unit 121 is connected to an input end of the second amplification unit 122, and output ends of the second amplification unit 122 are connected to an input end of the control module 2 and an input end of the determination sub-module 13, respectively.
Referring to fig. 1 and 5, further, the first amplification unit 121 includes a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C9, a capacitor C12, a capacitor C14, a resistor R3, a resistor R5, a resistor R8, a resistor R9, and an amplifier U1; one end of the resistor R5 is connected to the signal output terminal PIR _ SINGLE, the other end of the resistor R5 is connected to the non-inverting input terminal of the amplifier U1, the signal output terminal PIR _ SINGLE is further connected to one end of the capacitor C3, one end of the capacitor C4 and one end of the resistor R3, the other end of the capacitor C3, the other end of the capacitor C4 and the other end of the resistor R3 are connected to the ground terminal GND, the inverting input terminal of the amplifier U1 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the ground terminal GND, the inverting input terminal of the amplifier U1 is further connected to one end of the resistor R9 and one end of the capacitor C14, the other end of the resistor R9 and the other end of the capacitor C14 are connected to the output terminal of the amplifier U1, the output terminal of the amplifier U1 is connected to one end of the capacitor C9, the other end of the capacitor C9 is connected to the second amplifying unit 122, the VSS terminal of the amplifier U1 is connected to the ground terminal GND, the VCC terminal of the amplifier U1 is connected to the VCC terminal and one terminal of the capacitor C2, respectively, and the other terminal of the capacitor C2 is connected to the ground GND.
The second amplifying unit 122 includes a resistor R4, a resistor R6, a resistor R10, a thermistor NTC, a capacitor C10, a capacitor C13, an amplifier U2, and a signal output terminal PIR _ AD; one end of the resistor R4 is connected to one end of the capacitor C9, the other end of the resistor R4 is connected to the inverting input terminal of the amplifier U2, the thermistor NTC is connected in parallel to both ends of the resistor R4, the inverting input terminal of the amplifier U2 is also connected to one end of the capacitor C13 and one end of the resistor R10, the other end of the capacitor C13 and the other end of the resistor R10 are both connected to the output terminal of the amplifier U2, the non-inverting input terminal of the amplifier U2 is connected to the power supply module 4, the output terminal of the amplifier U2 is also connected to one end of the resistor R6, the other end of the resistor R6 is connected to one ends of the signal output terminal PIR _ AD and the capacitor C10, and the other end of the capacitor C10 is connected to GND.
When the first amplifying unit 121 receives the second electrical signal, the first amplifying unit 121 amplifies the second electrical signal in one stage, the second electrical signal amplified in one stage is input to the second amplifying unit 122, the second amplifying unit 122 amplifies the second electrical signal amplified in one stage in two stages to obtain a third electrical signal, and the third electrical signal can be identified and judged by the judging submodule 13 through the multistage amplification of the first amplifying unit 121 and the second amplifying unit 122, which is more convenient.
Referring to fig. 2, the determining submodule 13 further includes a first comparing unit 131 and a second comparing unit 132, an input terminal of the first comparing unit 131 and an input terminal of the second comparing unit 132 are both connected to an output terminal of the second amplifying unit 122, and an output terminal of the first comparing unit 131 and an output terminal of the second comparing unit 132 are both connected to the control module 2.
Referring to fig. 1 and 4, in the present alternative embodiment, the first comparing unit 131 includes an amplifier U3 and a diode D1, a non-inverting input terminal of the amplifier U3 is connected to an output terminal of the amplifier U2, an inverting input terminal of the amplifier U3 is connected to the power supply module 4, an output terminal of the amplifier U3 is connected to an anode of the diode D1, a cathode of the diode D1 is connected to the interrupt wakeup terminal INT, a cathode of the diode D1 is further connected to a resistor R7, and the other end of the resistor R7 is connected to the ground terminal GND.
The second comparing unit 132 comprises an amplifier U4 and a diode D2, wherein an inverting input terminal of the amplifier U4 is connected to an output terminal of the amplifier U2, a non-inverting input terminal of the amplifier U4 is connected to the power supply module 4, an output terminal of the amplifier U4 is connected to an anode of the diode D2, and a cathode of the diode D2 is connected to the interrupt wakeup terminal INT.
The power supply module 4 provides reference voltages for the first comparing unit 131 and the second comparing unit 132, so as to obtain a preset voltage range, that is, the reference voltage of the first comparing unit 131 is an upper limit value of the preset voltage range, and the reference voltage of the second comparing unit 132 is a lower limit value of the preset voltage range.
When the voltage of the third electrical signal is greater than the reference voltage of the first comparing unit 131 or the voltage of the third electrical signal is lower than the reference voltage of the second comparing unit 132, the first comparing unit 131 or the second comparing unit 132 outputs a trigger signal to the control module 2, and when the control module 2 receives the trigger signal, the infrared detection sub-module detects an infrared signal.
In this embodiment, the control module 2 is a 51-chip microcomputer.
Referring to fig. 5, as an optional implementation manner of this embodiment, the light intensity identification module 3 includes a light intensity detection submodule 31 and a conversion submodule 32, an input end of the light intensity detection submodule 31 and an input end of the conversion submodule 32 are both connected to an enable end of the control module 2, an output end of the light intensity detection submodule 31 is connected to an input end of the conversion submodule 32, and an output end of the conversion submodule 32 is connected to an input end of the control module 2.
Referring to fig. 6, the light intensity recognition module 3 includes a resistor R13, a resistor R15, a light sensitive resistor PT1, a capacitor C17, and a MOS transistor Q1; one end of a photoresistor PT1 is connected to an enable terminal EN of the control module 2, the other end of the photoresistor PT1 is connected to the gate of the MOS transistor Q1 and one end of the resistor R15, the other end of the resistor R15 is connected to the ground terminal GND, the drain of the MOS transistor Q1 is connected to the ground terminal GND, the drain of the MOS transistor Q1 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to the enable terminal EN of the control module 2, the drain of the MOS transistor Q1 is also connected to one end of a capacitor C17 and a signal output terminal LIGHT, the other end of the capacitor C17 is connected to the ground terminal GND signal output terminal, and the signal output terminal LIGHT is connected to the input terminal of the control module 2.
In this alternative embodiment, the light intensity detection submodule 31 is a photoresistor PT1, and the conversion submodule 32 is a MOS transistor Q1.
The detection threshold of the photoresistor PT1 can be adjusted by adjusting the resistance value of the resistor R15, when the photoresistor PT1 detects white LIGHT and converts the illumination intensity of the white LIGHT into a first electric signal, the voltage of the first electric signal is greater than the conduction voltage of the MOS tube Q1, and at the moment, the control module 2 resets the control module 2 when detecting that the level of the signal output end LIGHT is low level, namely, strong LIGHT interference exists; when the voltage of the first electrical signal is smaller than the turn-on voltage of the MOS transistor Q1, the control module 2 detects that the level of the LIGHT output terminal LIGHT is a high level, that is, there is no strong LIGHT interference, the infrared signal at this time is an infrared signal emitted by a human body, and the control module 2 controls the corresponding control device to operate.
When there are both infrared signals of a human body and infrared signals of strong LIGHT, the high level and the low level output by the signal output end LIGHT at this time are in periodic variation, that is, the control module 2 can judge that there is both a human body passing through and strong LIGHT according to the periodic variation of the high level and the low level, and at this time, the control module 2 controls the corresponding control device to operate.
Referring to fig. 1 and 7, as an alternative implementation manner of the present embodiment, the power supply module 4 includes a first power supply sub-module 41, a second power supply sub-module 42, and a third power supply sub-module 43, an input terminal of the first power supply sub-module 41 is connected to a power supply terminal VCC, an output terminal of the first power supply sub-module 41 is connected to an inverting input terminal of the amplifier U3, an input terminal of the second power supply sub-module 42 is connected to the power supply terminal VCC, an output terminal of the second power supply sub-module 42 is connected to a non-inverting input terminal of the amplifier U2, an input terminal of the third power supply sub-module 43 is connected to the power supply terminal VCC, and an output terminal of the third power supply sub-module 43 is connected to a non-inverting input terminal of the amplifier U4.
Referring to fig. 7 and 8, further, the first power supply module 41 includes a resistor R17 and a resistor R18, one end of the resistor R17 is connected to the power supply terminal VCC, the other end of the resistor R17 is connected to one end of the resistor R18, the other end of the resistor R18 is connected to the ground terminal GND, and the connection point of the resistor R17 and the resistor R18 is connected to the non-inverting input terminal of the amplifier U3.
Referring to fig. 7 and 9, the second power supply module 42 includes a resistor R19 and a resistor R21, one end of the resistor R19 is connected to the power supply terminal VCC, the other end of the resistor R19 is connected to one end of the resistor R21, the other end of the resistor R21 is connected to the ground terminal GND, and the connection point of the resistor R19 and the resistor R21 is connected to the non-inverting input terminal of the amplifier U2.
Referring to fig. 7 and 10, the third power supply module 43 includes a resistor R20 and a resistor R22, one end of the resistor R20 is connected to the power supply terminal VCC, the other end of the resistor R20 is connected to one end of the resistor R22, the other end of the resistor R20 is connected to the ground terminal GND, and the connection point of the resistor R20 and the resistor R22 is connected to the non-inverting input terminal of the amplifier U4.
By adjusting the resistance values of the resistor R17 and the resistor R18, the reference voltage of the amplifier U3 can be adjusted; by adjusting the resistance values of the resistor R19 and the resistor R20, the reference voltage of the amplifier U2 can be adjusted; by adjusting the resistance values of the resistor R21 and the resistor R22, the reference voltage of the amplifier U4 can be adjusted.
Referring to fig. 11, as another alternative embodiment of the present embodiment, the power supply module 4 includes a resistor R11, a resistor R12, a resistor R14, a resistor R16, a capacitor C15, and a capacitor C16; one end of a resistor R11 is connected to a power supply terminal VCC, the other end of a resistor R11 is connected to one end of a resistor R12, the other end of a resistor R12 is connected to one end of a resistor R14, the other end of a resistor R14 is connected to one end of a resistor R16, the other end of a resistor R16 is connected to a ground terminal GND, one end of a capacitor C15 is connected to the power supply terminal VCC, the other end of a capacitor C15 is connected to the ground terminal GND, one end of a capacitor C16 is connected to a connection point of a resistor R11 and a resistor R12, the other end of a capacitor C16 is connected to the ground terminal GND, a connection point of the resistor R11 and the resistor R12 is further connected to an inverting input terminal of an amplifier U3, a connection point of the resistor R12 and the resistor R14 is connected to a non-inverting input terminal of an amplifier U2, and a connection point of the resistor R14 and the resistor R16 is connected to a non-inverting input terminal of the amplifier U4.
The implementation principle of the human body infrared detection white light interference resisting circuit in the embodiment of the application is as follows: when the infrared acquisition submodule 11 acquires an infrared signal, the infrared sensor PIR converts the acquired infrared signal into a second electrical signal, and then the second electrical signal is amplified by the first amplification unit 121 and the second amplification unit 122 to obtain a third electrical signal, when the voltage of the third electrical signal is greater than the reference voltage of the first comparison unit 131 or the voltage of the third electrical signal is less than the reference voltage of the second comparison unit 132, the first comparison unit 131 or the second comparison unit 132 outputs a trigger signal, then the control module 2 outputs an enable signal according to the received trigger signal, the light intensity identification module 3 controls the photoresistor PT1 to detect the intensity of white light according to the received enable signal, and when the voltage of the photoresistor PT1 enables the MOS transistor Q1 to be turned on, the control module 2 detects a low level, and at this time resets the control module 2; when the voltage of the photoresistor PT1 is not enough to turn on the MOS transistor Q1, the control module 2 determines that the infrared signal is an infrared signal emitted by a human body, and at this time, the control module 2 controls the corresponding control device to operate.
The embodiment also discloses a human body infrared detector which comprises the human body infrared detection white light interference resisting circuit in the embodiment.
The embodiment also discloses a method for resisting white light interference in human body infrared detection, and with reference to fig. 12, the method for resisting white light interference in human body infrared detection comprises the following steps:
step 101, the infrared detection module 1 detects whether an infrared signal is received, and if so, the process goes to step S102.
Specifically, when the infrared acquisition submodule 11 detects an infrared signal, the infrared acquisition submodule 11 converts the infrared signal into a second electrical signal, then the second electrical signal is amplified by the amplification submodule 12 to obtain a third electrical signal, then the third electrical signal is input to the judgment submodule 13, and the judgment submodule 13 judges whether the infrared signal is received according to the voltage of the third electrical signal and a preset voltage range.
Step S102, the infrared detection module 1 sends a trigger signal to the control module 2.
Specifically, when the voltage of the third electrical signal is not within the preset voltage range, the determining sub-module 13 outputs a trigger signal to the control module 2.
In step S103, the control module 2 sends an enable signal to the light intensity identification module 3 according to the trigger signal.
Step S104, the light intensity identification module 3 detects the illumination intensity of the white light according to the enable signal and generates a detection result.
The light intensity detection submodule 31 detects the light intensity of the white light, converts the light intensity of the white light into a first electrical signal, and the conversion submodule 32 converts the light intensity of the white light into a digital signal according to the first electrical signal, and then generates a detection result according to the digital signal, wherein the detection result includes an infrared signal only transmitted by a human body, an infrared signal transmitted by both the human body and the hard light, and an infrared signal only transmitted by the hard light.
Step S105, the control module 2 judges whether strong light interference exists according to the detection result; if the strong light interference exists, the step S106 is carried out; if there is no strong light interference, the process proceeds to step S107.
When the detection result is that only the infrared signal emitted by the human body exists or the infrared signal emitted by the human body and the infrared signal emitted by the strong light exist, judging that the strong light interference does not exist;
and when the detection result is that only the infrared signal emitted by the strong light exists, judging that the strong light interference exists.
In step S106, the control module 2 controls the infrared detection module 1 to detect the infrared signal again.
In step S107, the control module 2 generates a control command and sends the control command to the control device.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (9)
1. A human body infrared detection white light interference resistant circuit is characterized by comprising an infrared detection module (1), a control module (2) and a light intensity identification module (3); the output end of the infrared detection module (1) is connected to the input end of the control module (2), the enabling end of the control module (2) is connected to the input end of the light intensity identification module (3), the output end of the light intensity identification module (3) is connected to the input end of the control module (2), and the output end of the control module (2) is connected to the control device;
the infrared detection module (1) is used for detecting whether an infrared signal is received or not, and if so, sending a trigger signal to the control module (2);
the control module (2) is used for receiving the trigger signal and sending an enabling signal to the light intensity identification module (3);
the light intensity identification module (3) is used for detecting the illumination intensity of the white light after receiving the enabling signal and outputting a first electric signal according to the illumination intensity of the white light;
the control module (2) is further configured to determine whether strong light interference exists according to the first electrical signal output by the light intensity identification module (3), and if strong light interference exists, reset the control module (2) and re-receive the trigger signal; and if no strong light interference exists, the control module (2) generates a control instruction and sends the control instruction to a corresponding control device.
2. The circuit according to claim 1, characterized in that the infrared detection module (1) comprises an infrared acquisition submodule (11), an amplification submodule (12) and a judgment submodule (13); the output end of the infrared acquisition submodule (11) is connected to the input end of the amplification submodule (12), the output end of the amplification submodule (12) is respectively connected to the input end of the control module (2) and the input end of the judgment submodule (13), and the output end of the judgment submodule (13) is connected to the input end of the control module (2);
the infrared acquisition submodule (11) is used for acquiring an infrared signal, converting the infrared signal into a second electric signal and transmitting the second electric signal to the amplification submodule (12);
the amplification sub-module (12) is used for receiving the second electric signal and amplifying the second electric signal to obtain a third electric signal; transmitting the third electrical signal to a comparison sub-module;
the judgment submodule (13) is used for receiving the third electric signal, judging whether the voltage of the third electric signal is within a preset voltage range, and if not, sending a trigger signal to the control module (2).
3. The circuit according to claim 2, characterized in that the amplification submodule (12) comprises a plurality of amplification submodules (12), the inputs of the amplification submodules (12) being connected to the outputs of the infrared acquisition submodule (11), the outputs of the amplification submodules (12) being connected to the inputs of the control module (2) and the input of the decision submodule (13), respectively.
4. The circuit according to claim 1, characterized in that the light intensity identification module (3) comprises a light intensity detection submodule (31); the light intensity detection submodule (31) is connected to the control module (2);
the light intensity detection submodule (31) is used for detecting the illumination intensity of the white light according to the enabling signal, converting the illumination intensity of the strong light into a first electric signal and inputting the first electric signal into the control module (2).
5. The circuit according to claim 4, wherein the light intensity identification module (3) further comprises a conversion submodule (32), an input terminal of the conversion submodule (32) is connected to the light intensity detection submodule (31), an output terminal of the conversion submodule (32) is connected to an input terminal of the control module (2), and an input terminal of the conversion submodule (32) is further connected to an enable terminal of the control module (2);
the conversion submodule (32) is used for converting the first electric signal into a digital signal and outputting the digital signal to the control module (2).
6. The circuit of claim 5, wherein the converting submodule (32) comprises a MOS transistor Q1, a gate of the MOS transistor Q1 is connected to the light intensity detecting submodule (31), a drain of the MOS transistor Q1 is connected to an enable terminal EN of the control module (2), a source of the MOS transistor Q1 is connected to a ground terminal GND, and a drain of the MOS transistor Q1 is further connected to the input terminal of the control module (2).
7. The circuit according to claim 2, further comprising a power supply module (4), wherein an input terminal of the power supply module (4) is connected to a power supply source, and an output terminal of the power supply module (4) is connected to a power terminal of the amplification submodule (12) and a power terminal of the judgment submodule (13), respectively.
8. A human body infrared detection white light interference resisting method is applied to the human body infrared detection white light interference resisting circuit according to any one of claims 1 to 7, and is characterized by comprising the following steps:
the infrared detection module (1) detects whether an infrared signal is received;
if yes, the infrared detection module (1) sends a trigger signal to the control module (2);
the control module (2) sends an enabling signal to the light intensity identification module (3) according to the trigger signal;
the light intensity identification module (3) detects the illumination intensity of the white light according to the enabling signal and generates a detection result;
the control module (2) judges whether strong light interference exists according to the detection result;
if the strong light interference exists, the control module (2) controls the infrared detection module (1) to detect the infrared signal again;
and if no strong light interference exists, the control module (2) generates a control instruction and sends the control instruction to a corresponding control device.
9. A human body infrared detector, characterized by comprising the human body infrared detection white light interference resisting circuit according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210653966.XA CN115079290A (en) | 2022-06-10 | 2022-06-10 | Human body infrared detection white light interference resisting circuit and method and human body infrared detector |
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| CN202210653966.XA CN115079290A (en) | 2022-06-10 | 2022-06-10 | Human body infrared detection white light interference resisting circuit and method and human body infrared detector |
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| CN115079290A true CN115079290A (en) | 2022-09-20 |
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| CN202210653966.XA Pending CN115079290A (en) | 2022-06-10 | 2022-06-10 | Human body infrared detection white light interference resisting circuit and method and human body infrared detector |
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