CN114488882B - Infrared shielding detection circuit and induction door system - Google Patents
Infrared shielding detection circuit and induction door system Download PDFInfo
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- CN114488882B CN114488882B CN202111680394.6A CN202111680394A CN114488882B CN 114488882 B CN114488882 B CN 114488882B CN 202111680394 A CN202111680394 A CN 202111680394A CN 114488882 B CN114488882 B CN 114488882B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
- E05F15/73—Power-operated mechanisms for wings with automatic actuation responsive to movement or presence of persons or objects
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
- E05F15/73—Power-operated mechanisms for wings with automatic actuation responsive to movement or presence of persons or objects
- E05F15/74—Power-operated mechanisms for wings with automatic actuation responsive to movement or presence of persons or objects using photoelectric cells
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
- E05F15/79—Power-operated mechanisms for wings with automatic actuation using time control
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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Abstract
The invention discloses an infrared shielding detection circuit and an induction door system, wherein the infrared shielding detection circuit comprises: the main control system is used for sending a first detection signal and a second detection signal; the infrared emission circuit is connected with the main control system and used for emitting detection infrared light to the area to be detected when receiving the first detection signal; the infrared receiving circuit is connected with the main control system and used for acquiring detection infrared light shielded by the shielding object in the area to be detected when receiving the second detection signal and converting the detection infrared light into a shielding photocurrent signal; the infrared interference light source is also used for acquiring interference infrared light and converting the interference infrared light into an interference photocurrent signal; the first input end of the shielding identification circuit is connected with the output end of the infrared receiving circuit, and the second input end of the shielding identification circuit is connected with the master control system; the shielding signal is output when the shielding photocurrent signal is received according to the second detection signal; and outputting an interference signal when the interference photocurrent signal is received. The invention can effectively eliminate interference signals generated by interference light.
Description
Technical Field
The invention relates to the technical field of induction doors, in particular to an infrared shielding detection circuit and an induction door system.
Background
Along with the development of science and technology, the induction door is more and more widely used in places such as market, station, hotel, brings very big facility for people's life.
When the induction door is used, a user can trigger the controller of the induction door to control the induction door to be in a door locking mode, an automatic mode or a long-open mode and the like. Conventional touch-tone or touch-sensitive controls, however, require the user's hand to press or touch to effect control, this causes inconvenience to the customers and easily causes contact-type transmission of bacteria and viruses when a plurality of users use the device.
At present, there is a novel contactless controller, wherein is provided with infrared inductor, and when the user sheltered from the response zone time of infrared inductor among the contactless controller, infrared inductor just exported trigger signal to the controller to realize carrying out contactless collection to user's control command through infrared inductor. However, the contactless controller has a certain disadvantage that when the infrared sensor senses the disturbing infrared light in the environment, the infrared sensor is easily triggered by mistake to send an error signal to the controller, and thus the contactless controller has a possibility of being triggered by mistake.
Disclosure of Invention
The invention mainly aims to provide an infrared shielding detection circuit and an induction door system, and aims to solve the problem that a non-contact controller of a sampling infrared sensor is easily triggered by mistake.
In order to achieve the above object, the present invention provides an infrared occlusion detection circuit, including:
the main control system is used for sending a first detection signal and a second detection signal;
the infrared emission circuit is connected with the master control system and used for emitting detection infrared light to an area to be detected when receiving the first detection signal;
the infrared receiving circuit is connected with the main control system and used for acquiring the detection infrared light shielded by the shielding object of the area to be detected when receiving the second detection signal and converting the detection infrared light shielded by the shielding object of the area to be detected into a shielding photocurrent signal; the infrared light detector is also used for acquiring interference infrared light and converting the interference infrared light into an interference photocurrent signal;
the first input end of the shielding identification circuit is connected with the output end of the infrared receiving circuit, and the second input end of the shielding identification circuit is connected with the master control system; the second detection signal is used for outputting a shielding signal when the shielding photocurrent signal is received; and outputting an interference signal when the interference photocurrent signal is received.
Optionally, the infrared occlusion detection circuit further comprises a conversion circuit; the first input end of the conversion circuit is connected with the output end of the shielding identification circuit, the second input end of the conversion circuit is connected with the master control system, and the output end of the conversion circuit is the output end of the infrared shielding circuit;
and the conversion circuit is used for amplifying the shielding signal when receiving the detection signal so as to enable the identification degree of the shielding signal to be higher.
Optionally, the conversion circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a first transistor, and a diode;
the base electrode of the first transistor is connected with the first end of the first capacitor, the emitter electrode of the first transistor is grounded with the second end of the first capacitor, the collector electrode of the diode is connected with the anode of the diode, the cathode of the diode is respectively connected with the first end of the second capacitor and the first end of the first resistor, the second end of the second capacitor and the second end of the first resistor are grounded, the anode of the diode is further connected with the first end of the second resistor, the base electrode of the first transistor is further connected with the first end of the third resistor, and the second end of the third resistor and the second end of the second resistor are connected with the master control system; the connection point of the base of the first transistor and the first capacitor is the input end of the conversion circuit, and the connection point of the cathode of the diode and the first end of the second capacitor and the first end of the first resistor is the output end of the conversion circuit.
Optionally, the infrared occlusion detection circuit further includes a transmission isolation circuit; the input end of the transmission isolation circuit is connected with the shielding identification circuit, and the output end of the transmission isolation circuit is connected with the input end of the conversion circuit.
Optionally, the transmission isolation circuit includes a third capacitor, a first end of the third capacitor is an input end of the transmission isolation circuit, and a second end of the third capacitor is an output end of the transmission isolation circuit.
Optionally, the occlusion recognition circuit includes a second transistor, a third transistor, a fourth capacitor, a fifth capacitor, a fourth resistor, and a fifth resistor; a base electrode of the second transistor is connected with a first end of the fourth capacitor, a connection node is an input end of the shielding identification circuit, a collector electrode of the second transistor is connected with a first end of the fourth resistor, a second end of the fourth resistor is connected with the main control system, a connection point where the collector electrode of the second transistor is connected with the first end of the fourth resistor is an output end of the shielding identification circuit, an emitter electrode of the second transistor is connected with the first end of the fifth resistor, and the second end of the fifth resistor and the second end of the fourth capacitor are grounded; a first end of the fifth capacitor and a base of the third transistor are respectively connected with a first end of the fifth resistor, a second end of the fifth capacitor and an emitter of the third transistor are grounded, and a collector of the third transistor is connected with a base of the second transistor.
Further, to achieve the above object, the present invention also provides an induction door system comprising a door and an infrared occlusion detection circuit configured as the infrared occlusion detection circuit described above; the door is connected with the master control system, and the master control system is connected with the output end of the shielding identification circuit;
the master control system is used for controlling the state of the door according to the received shielding signal.
Optionally, the master control system is configured to control the state of the door according to the received shielding signal, and specifically includes:
the master control system controls the state of the door according to a preset rule when receiving a shielding signal for a preset number of times within a first preset time; the door state comprises a door locking state, a normally open state and a human body induction control state.
Optionally, the induction door system further comprises a human body induction module, and the human body induction module is connected with the master control system;
the human body sensing module is used for detecting a human body signal of the area to be detected when the door is in a human body sensing control state, and outputting a human body triggering signal to the main control system when the human body signal is detected;
the main control system is further used for controlling the door to open for a second preset time when the human body trigger signal is received.
Optionally, the master control system is configured to control the state of the door according to the received shielding signal, and specifically further includes:
the master control system acquires the duration of the shielding signal;
and when the duration time is detected to exceed a third preset time, controlling the door to be opened to the maximum opening degree.
The infrared detection device sends a first detection signal and a second detection signal through the master control system, so that the infrared emission circuit emits detection infrared light to an area to be detected according to the first detection signal; when receiving a second detection signal, the infrared receiving circuit converts the obtained detection infrared light which is shielded by the shielding object into a shielding photocurrent signal, and converts the received interference infrared light into an interference photocurrent signal; when the shielding identification circuit receives the shielding photocurrent signal, the shielding identification circuit can identify that the user shields the area to be detected, and therefore a shielding signal representing a user instruction is sent out; when the interference photocurrent signal is received, the infrared receiving circuit can be identified to be triggered by the interference light in the environment, and therefore an interference signal is output. Therefore, when the non-contact controller receives the interference signal, the signal can be ignored, and only the shielding signal is received, the control instruction of the user can be identified. Therefore, the identification precision and the control accuracy of the contactless controller are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an infrared occlusion detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a portion of an infrared occlusion detection circuit according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a portion of an infrared occlusion detection circuit according to another embodiment of the invention;
fig. 4 is a schematic waveform diagram of a first detection signal and a second detection signal of an infrared occlusion detection circuit according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
The reference numbers illustrate:
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
In addition, the descriptions relating to "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention provides an infrared occlusion detection circuit, referring to fig. 1, in an embodiment, the infrared occlusion detection circuit includes:
a main control system 10, configured to send a first detection signal and a second detection signal;
the infrared transmitting circuit 20 is connected with the main control system 10, and is used for transmitting detection infrared light to the area to be detected when receiving the first detection signal;
the infrared receiving circuit 30 is connected to the main control system 10, and is configured to, when receiving the second detection signal, obtain detection infrared light that is blocked by a blocking object in the area to be detected, and convert the detection infrared light that is blocked by the blocking object in the area to be detected into a blocking photocurrent signal; the infrared light detector is also used for acquiring interference infrared light and converting the interference infrared light into an interference photocurrent signal;
a first input end of the shielding identification circuit 40 is connected with the output end of the infrared receiving circuit 30, and a second input end of the shielding identification circuit is connected with the master control system 10; the second detection signal is used for outputting a shielding signal when the shielding photocurrent signal is received; and outputting an interference signal when the interference photocurrent signal is received.
The infrared occlusion detection circuit may be provided in various electronic devices, such as a contactless controller, that contactlessly receive a user command through an infrared sensor to implement contactless control.
When the contactless control needs to be implemented, the main control system 10 sends a first detection signal and a second detection signal, where the first detection signal is used to trigger the infrared emission circuit 20 to emit detection infrared light to the area to be detected, and there are three possible situations in the area to be detected at this time: the first is that the user needs to send an instruction to shield the detection infrared light of the detection area to be detected, and the second is that the user does not need to send an instruction to shield the detection infrared light of the detection area to be detected; and thirdly, the interference infrared light appears in the area to be detected.
The second detection signal triggers the infrared receiving circuit 30 to start working, and correspondingly, the working state of the infrared receiving circuit 30 is also divided into three conditions: when receiving the detection infrared light shielded by the shielding object in the area to be detected, converting the detection infrared light into a shielding photocurrent signal; when receiving the detection infrared light of which the area to be detected is not shielded, the infrared light detector does not act, namely, does not output any current signal; when receiving the interference infrared light of the detection area to be detected, converting the interference infrared light into an interference photocurrent signal.
The second detection signal also triggers the occlusion recognition circuit 40 to start working, and the occlusion recognition circuit 40 will only receive the occlusion photocurrent signal and the interference photocurrent signal and recognize the two photocurrent signals. Although the shielding photocurrent signal and the interference photocurrent signal output by the infrared receiving circuit 30 are different, the two signals have very weak currents, and if the signals are directly output, the resolution of the conventional main control chip still cannot distinguish which current signal is, so the shielding identification circuit 40 needs to be provided.
Specifically, the first detection signal may be a square wave signal, and the second detection signal may be a high level signal. The detection infrared light emitted by the infrared emitting circuit 20 is discontinuous infrared light, and when the detection infrared light is blocked, the blocked photocurrent signal output by the infrared receiving circuit 30 according to the detection infrared light is also discontinuous current signal; when the infrared receiving circuit 30 receives the interference light signal, the output interference photocurrent signal is a continuous current signal.
When the shielding identification circuit 40 receives the intermittent current signal, the signal is amplified, so that the output shielding signal is a square wave signal, and therefore, the user can be identified to shield the area to be detected and send a shielding instruction; when the occlusion recognition circuit 40 receives the continuous ground current signal, the signal is also amplified, but the output signal is no longer a square wave signal, so that it can be recognized that the infrared receiving circuit 30 is falsely triggered by the interference light in the environment.
The main control system 10 may include a main control chip of the contactless controller, and the main control chip may be connected to an output end of the shielding identification circuit 40, directly obtain the shielding signal and the interference signal, and perform corresponding control operation according to the shielding signal. For example, the master control chip of the contactless controller for the induction door may control different states of the door according to the received shielding signal.
According to the scheme, the main control system 10 sends out a first detection signal and a second detection signal, so that the infrared emission circuit 20 emits detection infrared light to the area to be detected according to the first detection signal; when receiving the second detection signal, the infrared receiving circuit 20 converts the obtained detected infrared light that is blocked by the blocking object into a blocking photocurrent signal, and converts the received interference infrared light into an interference photocurrent signal; therefore, when the shielding photocurrent signal is received by the shielding identification circuit 40, it can be identified that the user shields the area to be detected, and therefore a shielding signal representing a user instruction is sent out; when the interference photocurrent signal is received, the infrared receiving circuit can be identified to be triggered by the interference light in the environment, and therefore an interference signal is output. Therefore, when the non-contact controller receives the interference signal, the signal can be ignored, and only the shielding signal is received, the control instruction of the user can be identified. Therefore, the non-contact controller can be prevented from being triggered by mistake, and the identification precision and the control accuracy of the non-contact controller are improved.
Further, referring to fig. 2, the infrared occlusion detection circuit further includes a conversion circuit 50; a first input end of the conversion circuit 50 is connected with an output end of the shielding identification circuit 40, a second input end of the conversion circuit is connected with the master control system 10, and an output end of the conversion circuit is an output end of the infrared shielding circuit 40;
the conversion circuit 50 is configured to amplify the occlusion signal when receiving the detection signal, so that the identification degree of the occlusion signal is higher.
It should be noted that, if the selected main control chip does not have an AD (analog-to-digital) function, the shielded photocurrent signal and the interference photocurrent signal may still have insufficient recognition degree after being amplified by the shielding recognition circuit 40 for one stage. In order to increase the selectable range of the main control chip when the scheme is implemented and reduce the cost, in this embodiment, the shielding signal is amplified for the second time, so that the waveform identification degree is higher, and even if the main control chip does not have an AD function, the IO port can accurately identify the signal when receiving the signal.
The conversion circuit 50 can also be used for converting the waveform of the shielding signal, so as to match the output waveform with the square waveform of the first detection circuit, so that the main control chip can compare the output waveform with the square waveform of the first detection circuit when identifying the shielding signal, thereby improving the identification accuracy, reducing the software programming difficulty, and further improving the identification accuracy of the shielding signal.
Further, referring to fig. 2, the infrared emission circuit 20 includes a seventh resistor R8, an eighth resistor R7, a fourth transistor Q1, and an infrared emission tube D1; a first end of the seventh resistor R8 is an input end of the infrared emission circuit 20, and a second end of the seventh resistor R8 is connected to a base of the fourth transistor Q1; the collector of the fourth transistor Q1 is connected with the cathode of the infrared emission tube D1, and the emitter is grounded; the positive pole of infrared emission pipe D1 with the first end of eighth resistance R7 is connected, the second end of eighth resistance R7 connects the power VCC.
In this embodiment, the infrared sensor may be an infrared pair tube, which has a strong adaptability to ambient light, and has a pair of infrared transmitting and receiving tubes, the transmitting tube transmits infrared rays of a certain frequency, and when the detection direction encounters an obstacle (reflecting surface), the infrared rays are reflected back to the receiving tube. The infrared transmitting tube D1 is a transmitting tube of infrared geminate transistors, works in a low-voltage range, and is low in energy consumption.
The infrared receiving circuit 30 comprises an infrared receiving tube D2 and a sixth resistor R5; the input end of the infrared receiving tube D2 is connected to the main control system 10, the output end is connected to the first end of the sixth resistor R5, and the second end of the sixth resistor R5 is the output end of the infrared receiving circuit 30.
The infrared receiving tube D2 is a receiving tube of the infrared pair tube, is not interfered by visible light, generally has reaction only to infrared rays, and has large photosensitive area and high sensitivity.
Further, referring to fig. 3, the infrared occlusion detection circuit further includes a linear voltage stabilizing circuit, where the linear voltage stabilizing circuit may specifically include a linear voltage stabilizing chip U2, a ninth resistor R9, and a plurality of capacitors, such as a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9, an input end of the linear voltage stabilizing circuit is connected to the input voltage vin, and an output power VCC may be used for master control and power supply
The linear voltage stabilizing circuit can play a role in power isolation, the voltage stability of the power VCC is guaranteed, ripple signals of the power VCC can be filtered, the power supply voltage of the infrared shielding detection circuit is stable, and the reliability of the whole circuit is enhanced.
The main control system 10 includes a main control chip U1, where U1 includes a transmitting port, a receiving port, an IO port, an OUT port, a PIR port, and the like. Wherein, the sending port is connected with the infrared emission circuit 20 for outputting a first detection signal; the receiving port is used for receiving the shielding signal, and can be connected with the output end of the conversion circuit 50 or the output end of the shielding identification circuit 40, and the IO port is connected with the infrared receiving circuit 30, the shielding identification circuit 40 and the conversion circuit 50 and is used for outputting a second detection signal; the OUT port is used for outputting a driving signal for controlling the equipment to be controlled, for example, a driving signal for controlling the state of a door output according to a shielding signal; the PIR port can be connected with the human body induction sensor and receives signals collected by the human body induction sensor.
Further, referring to fig. 2 again, the occlusion recognition circuit 40 includes a second transistor Q3, a third transistor Q2, a fourth capacitor C4, a fifth capacitor C5, a fourth resistor R3, and a fifth resistor R6; a base electrode of the second transistor Q3 is connected to a first end of the fourth capacitor C4, a connection node is an input end of the occlusion recognition circuit 40, a collector electrode of the second transistor Q3 is connected to a first end of the fourth resistor R3, a second end of the fourth resistor R3 is connected to the main control system 10, a connection point at which a collector electrode of the second transistor Q3 is connected to the first end of the fourth resistor R3 is an output end of the occlusion recognition circuit 40, an emitter electrode of the second transistor Q3 is connected to a first end of the fifth resistor R6, and a second end of the fifth resistor R6 and a second end of the fourth capacitor C4 are grounded; a first end of the fifth capacitor C5 and a base of the third transistor Q2 are connected to a first end of the fifth resistor R6, respectively, a second end of the fifth capacitor C2 and an emitter of the third transistor Q2 are grounded, and a collector of the third transistor Q2 is connected to a base of the second transistor Q3.
And a second end of the fourth resistor R3 is also connected with an IO port of the master control system 10, and a second end of the fourth resistor R3 is also connected with the infrared receiving tube D2.
The conversion circuit 50 comprises a first resistor R4, a second resistor R1, a third resistor R2, a first capacitor C2, a second capacitor C3, a first transistor Q4 and a diode D100;
a base electrode of the first transistor Q4 is connected to a first end of the first capacitor C2, an emitter electrode is connected to a second end of the first capacitor C2, a collector electrode is connected to an anode of the diode D100, a cathode of the diode D100 is connected to a first end of the second capacitor C3 and a first end of the first resistor R4, a second end of the second capacitor C3 and a second end of the first resistor R4 are grounded, an anode of the diode D100 is further connected to a first end of the second resistor R1, a base electrode of the first transistor Q4 is further connected to a first end of the third resistor R2, and a second end of the third resistor R2 and a second end of the second resistor R1 are connected to the main control system 10; a connection point at which the base of the first transistor Q4 is connected to the first capacitor C2 is an input end of the conversion circuit 50, and a connection point at which the cathode of the diode D100 is connected to the first end of the second capacitor C3 and the first end of the first resistor R4 is an output end of the conversion circuit 50.
Referring to fig. 4, the first detection signal may also be a square wave in a fourth preset time period, and a low level in a fifth preset time period, which are repeated; the corresponding second detection signal is at a high level in a fourth preset time period and at a low level in a fifth preset time period, that is, the master control system 10 transmits the square wave through the transmitting port, and the IO port supplies power, and the IO port stops supplying power to the receiving port while the transmitting port stops transmitting the square wave. Thus, the disturbance light can be effectively detected, and the power consumption of the whole system can be reduced. The fourth and fifth preset time periods may be combined with the actual circuit setting.
Specifically, when the first condition occurs in the region to be detected: the user shelters from and treats the detection zone, and when transmission port transmission high level, infrared receiving tube D2 switched on, shelters from the receiving head when transmission port transmission low level, and infrared receiving tube D2 is nonconducting, so transmission port transmission square wave can judge effectively whether shelter from for the user. When the shielding exists, current flows through the sixth resistor R5, the second transistor Q3 is conducted, voltage drop is generated when the current flows through the fifth resistor R6, the third transistor Q2 is conducted, the current flowing through the sixth resistor R5 is directly conducted through the third transistor Q2 and is short-circuited to the ground, the second transistor Q3 is disconnected, then the third transistor Q2 is disconnected, the transmitting port is at a low level at this time, the infrared receiving tube D2 is not conducted and keeps the original state, when the transmitting port transmits a high level, the shielding exists, and the above actions are repeatedly circulated. Amplifying the base level voltage of Q3 by two levels of two triodes of Q3 and Q4, and obtaining an amplified waveform at a receiving port; the fourth capacitor C4, the first capacitor C2 and the fifth capacitor C5 mainly serve as a storage point, so that the second transistor Q3, the first transistor Q4 and the third transistor Q2 can quickly turn on the Q3 when a signal arrives next time. The diode D100 is used for enabling the receiving port to be at a high level when the IO port outputs a high level, and the electric quantity of the second capacitor C3 cannot flow back, and can only be consumed through the first resistor R4; the second capacitor C3 may be discharged within a fifth preset time period.
When the area to be detected has the second condition: the user does not send an instruction, namely under the condition that the detection area to be detected is not shielded: the infrared receiving tube D2 is not turned on, the shielding identification circuit 40 maintains the original state, and the collector of the second transistor Q3 is at a high level; at this time, the first transistor Q4 is turned on, the second capacitor C3 is discharged, and the receiving port is at a low level.
When the area to be detected has a third condition: when the interference infrared light appears in the area to be detected, the infrared receiving tube D2 is continuously conducted, the second transistor Q3 is conducted, the collector is at a low level, the first transistor Q4 is disconnected, and the second capacitor C3 is charged; when current flows through the R6 to generate voltage drop, the third transistor Q2 is switched on, the second transistor Q3 is switched off, the collector of the second transistor Q3 is at high level, the first transistor Q4 is switched on at the moment, and the second capacitor C3 is discharged; the receive port is low.
In summary, based on the above hardware structure, the method can be used. An amplified waveform appearing at the receiving port by integrating the base level voltage of the second transistor Q3 with the two-stage amplification of the second transistor Q3 and the first transistor Q4; therefore, the identifiability of the waveform of the output signal is enhanced, and the influence of shielding or interference light is effectively identified, so that a controller connected with the circuit cannot be triggered by mistake, the control is more accurate, and the control reliability is greatly improved.
Further, the infrared occlusion detection circuit further includes a transmission isolation circuit 60; the input end of the transmission isolation circuit 60 is connected to the occlusion recognition circuit 40, and the output end is connected to the input end of the conversion circuit 50. The transmission isolation circuit 60 serves to isolate the occlusion recognition circuit 40 from the conversion circuit 50, and prevents signals of the two circuits from interfering with each other, thereby making the occlusion signal output by the conversion circuit 50 more accurate.
Further, the transmission isolation circuit 60 includes a third capacitor C1, where a first end of the third capacitor C1 is an input end of the transmission isolation circuit 60, and a second end is an output end of the transmission isolation circuit 60. The third capacitor C1 can separate the second transistor Q3 from the third transistor Q2, and noise between the two transistors cannot be amplified, so that the waveform of the shielding signal is more accurate and can be identified by the main control chip more easily.
The invention provides an induction door system, which comprises a door and an infrared shielding detection circuit, wherein the structure of the infrared shielding detection circuit can be set by referring to the infrared shielding detection circuit 10 in the embodiment, which is not described herein any more, the door is connected with a main control system, and the main control system 10 is connected with the output end of a shielding identification circuit 40; the master control system 10 is configured to control the state of the door according to the received shielding signal. It should be understood that, since the induction door system of the present embodiment adopts the technical solution of the above-mentioned infrared shielding detection circuit, the induction door system has all the beneficial effects of the above-mentioned infrared shielding detection circuit.
Further, the main control system 10 is configured to control the state of the door according to the received shielding signal, and specifically includes:
the master control system 10 controls the state of the door according to a preset rule when receiving a shielding signal for a preset number of times within a first preset time; the door state comprises a door locking state, a normally open state and a human body induction control state.
The first preset time can be set according to the sensitivity of the circuit for identifying the shielding, and the preset times are positive integers and can be set according to actual needs; the preset rule may be an alternate handover.
Alternatively, if the user completes the blocking within one second, the master control system 10 receives a blocking signal, and switches one state of the door. If the occlusion has not ended for one second, the occlusion is not recognized as a primary occlusion signal.
If the default state of the door is the door locking state, the shielding signal is received once and is switched to the normally open state, the shielding signal is received once again and is switched to the human body induction control state, and the shielding signal is received once again and is switched to the door locking state again.
The door can be switched to the door locking state after receiving the shielding signal within one second; receiving two shielding signals, and switching to a normally open state; and receiving the three shielding signals, and switching to a human body induction control state.
Further, the induction door system further comprises a human body induction module, and the human body induction module is connected with the main control system 10;
the human body sensing module is used for detecting a human body signal of the area to be detected when the door is in a human body sensing control state, and outputting a human body triggering signal to the master control system when the human body signal is detected;
the main control system 10 is further configured to control the door to open for a second preset time when the human body trigger signal is received.
The second preset time may be set according to a flow rate of a person in a place where the induction door system is set, and if the flow rate of the person is large, the flow rate may be set to be slightly longer. Assuming that the second preset time is 20S, the door is controlled to be opened for 20S when the human body trigger signal is received for the first time, if the human body trigger signal is not received within 20S, the door is closed, and if the human body trigger signal is received within 20S again, the door is controlled to be opened for 20S again.
Further, the main control system is configured to control the state of the door according to the received shielding signal, and specifically further includes:
the master control system 10 acquires the duration of the shielding signal;
and when the duration time is detected to exceed a third preset time, controlling the door to be opened to the maximum opening degree.
The third preset time also needs to be set by combining with an actual control occasion, and the opening degree of the door is controlled according to the difference value between the shielding duration time and the third preset time. Assuming that the third preset time is 2S, when the time of one shielding exceeds 2S, the door is gradually opened along with the continuous shielding, and the opening degree of the door is larger as the duration is longer until the maximum opening degree is reached.
Therefore, the shielding signal representing the user instruction is sampled by the infrared shielding detection circuit, the control of the induction door is completed, the non-contact control of an induction door system and the switching of various states of the door are realized, the safety, the reliability and the high precision are realized, and the great convenience is brought to the life of a user.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or system comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An infrared occlusion detection circuit, comprising:
the main control system is used for sending a first detection signal and a second detection signal;
the infrared emission circuit is connected with the main control system and used for emitting detection infrared light to an area to be detected when the first detection signal is received;
the infrared receiving circuit is connected with the master control system and used for acquiring the detection infrared light shielded by the shielding object of the area to be detected when receiving the second detection signal and converting the detection infrared light shielded by the shielding object of the area to be detected into a shielding photocurrent signal; the infrared light processing device is also used for acquiring interference infrared light and converting the interference infrared light into an interference photocurrent signal;
the first input end of the shielding identification circuit is connected with the output end of the infrared receiving circuit, and the second input end of the shielding identification circuit is connected with the master control system; the second detection signal is used for outputting a shielding signal when the shielding photocurrent signal is received; and outputting an interference signal when the interference photocurrent signal is received.
2. The infrared occlusion detection circuit of claim 1, further comprising a conversion circuit; the first input end of the conversion circuit is connected with the output end of the shielding identification circuit, the second input end of the conversion circuit is connected with the master control system, and the output end of the conversion circuit is the output end of the infrared shielding detection circuit;
and the conversion circuit is used for amplifying the shielding signal when receiving the detection signal so as to enable the identification degree of the shielding signal to be higher.
3. The infrared occlusion detection circuit of claim 2, wherein the conversion circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a first transistor, and a diode;
the base electrode of the first transistor is connected with the first end of the first capacitor, the emitter electrode of the first transistor is grounded with the second end of the first capacitor, the collector electrode of the diode is connected with the anode of the diode, the cathode of the diode is respectively connected with the first end of the second capacitor and the first end of the first resistor, the second end of the second capacitor and the second end of the first resistor are grounded, the anode of the diode is further connected with the first end of the second resistor, the base electrode of the first transistor is further connected with the first end of the third resistor, and the second end of the third resistor and the second end of the second resistor are connected with the master control system; the connection point of the base of the first transistor and the first capacitor is the input end of the conversion circuit, and the connection point of the cathode of the diode, the first end of the second capacitor and the first end of the first resistor is the output end of the conversion circuit.
4. The infrared occlusion detection circuit of any of claims 2-3, further comprising a transmission isolation circuit; the input end of the transmission isolation circuit is connected with the shielding identification circuit, and the output end of the transmission isolation circuit is connected with the input end of the conversion circuit.
5. The infrared occlusion detection circuit of claim 4, wherein the transmission isolation circuit includes a third capacitor, a first terminal of the third capacitor being an input terminal of the transmission isolation circuit, a second terminal being an output terminal of the transmission isolation circuit.
6. The infrared occlusion detection circuit of claim 1, wherein the occlusion recognition circuit comprises a second transistor, a third transistor, a fourth capacitor, a fifth capacitor, a fourth resistor, and a fifth resistor; a base electrode of the second transistor is connected with a first end of the fourth capacitor, a connection node is an input end of the shielding identification circuit, a collector electrode of the second transistor is connected with a first end of the fourth resistor, a second end of the fourth resistor is connected with the main control system, a connection point where the collector electrode of the second transistor is connected with the first end of the fourth resistor is an output end of the shielding identification circuit, an emitter electrode of the second transistor is connected with the first end of the fifth resistor, and the second end of the fifth resistor and the second end of the fourth capacitor are grounded; a first end of the fifth capacitor and a base of the third transistor are respectively connected to a first end of the fifth resistor, a second end of the fifth capacitor and an emitter of the third transistor are grounded, and a collector of the third transistor is connected to a base of the second transistor.
7. An induction door system comprising a door and an infrared occlusion detection circuit configured as an infrared occlusion detection circuit as claimed in any of claims 1 to 6; the door is connected with the master control system, and the master control system is connected with the output end of the shielding identification circuit;
the master control system is used for controlling the state of the door according to the received shielding signal.
8. The induction door system of claim 7, wherein the master control system is configured to control the state of the door based on the received occlusion signal, and specifically comprises:
the master control system controls the state of the door according to a preset rule when receiving shielding signals for a preset number of times within a first preset time; the door state comprises a door locking state, a normally open state and a human body induction control state.
9. The induction door system of claim 8, further comprising a body induction module, wherein the body induction module is coupled to the master control system;
the human body sensing module is used for detecting a human body signal of the area to be detected when the door is in a human body sensing control state, and outputting a human body triggering signal to the main control system when the human body signal is detected;
the master control system is further used for controlling the door to open for a second preset time when the human body trigger signal is received.
10. The induction door system of claim 7, wherein the master control system is configured to control the state of the door based on the received occlusion signal, and further comprising:
the master control system acquires the duration of the shielding signal;
and when the duration time is detected to exceed a third preset time, controlling the door to be opened to the maximum opening degree.
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| CN202111680394.6A CN114488882B (en) | 2021-12-30 | 2021-12-30 | Infrared shielding detection circuit and induction door system |
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| CN202111680394.6A CN114488882B (en) | 2021-12-30 | 2021-12-30 | Infrared shielding detection circuit and induction door system |
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| CN114488882B true CN114488882B (en) | 2022-10-25 |
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| CN103244003A (en) * | 2013-04-28 | 2013-08-14 | 刘腾飞 | PLC-based (programmable logic controller-based) automatic door control system |
| CN105976463A (en) * | 2016-04-29 | 2016-09-28 | 支红抗 | Electronic remote control lock automatic locking control circuit |
| CN108008462A (en) * | 2017-12-30 | 2018-05-08 | 南京超华电子信息科技有限公司 | A kind of automatically-controlled door infrared induction device |
| CN110976061A (en) * | 2019-12-19 | 2020-04-10 | 常州市浦西尔电子有限公司 | Paper full detection circuit and method capable of distinguishing infrared rays |
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