Human body welcome alarm control circuit and human body welcome alarm

Abstract

The utility model discloses a human body welcome alarm control circuit and a human body welcome alarm, and relates to the technical field of human body welcome alarms. The human body welcome alarm control circuit comprises a pyroelectric infrared sensor, a first infrared geminate transistor circuit, a second infrared geminate transistor circuit and a main control circuit. Wherein the first infrared geminate transistor circuit is arranged at a first position in the in-out direction of the entrance and exit, and when a customer gets close to the first position, a first trigger signal can be triggered to be output. And the second infrared geminate transistor circuit is arranged at a second position in the in-out direction of the entrance and exit, and can trigger the output of a second trigger signal when the customer approaches the second position. The main control circuit can determine that a customer is in an entering state or an exiting state according to the triggering sequence of the first triggering signal and the second triggering signal when detecting that the customer is close to the entrance and exit according to the human body detection signal output by the pyroelectric infrared sensor. Therefore, the in-out direction of the customer can be accurately judged.

Description

Technical Field

[0001] The utility model relates to the technical field of human body greeters, and particularly relates to a control circuit for a human body greeter and a human body greeter. Background Art

[0002] Human body greeters play an important role in the retail industry, especially in convenience stores and small shops. They can not only remind the store staff that a customer has entered, but also give the customer a warm welcome. Currently, the common greeters on the market mainly include human body induction greeters, laser greeters and ultrasonic greeters.

[0003] However, most of the currently commercial human body greeters cannot accurately judge the entry and exit directions of customers. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a control circuit for a human body greeter, aiming at solving the problem that the existing human body greeters cannot accurately judge the entry and exit directions of customers.

[0005] To achieve the above purpose, the utility model proposes a control circuit for a human body greeter. The human body greeter is arranged at the entrance and exit. The control circuit for the human body greeter includes:

[0006] A pyroelectric infrared sensor, which is used to detect the human body infrared information near the entrance and exit in the environment and output a corresponding human body detection signal;

[0007] A first infrared pair tube circuit, which is arranged at a first position in the entry and exit direction of the entrance and exit; the first infrared pair tube circuit is used to trigger the output of a first trigger signal when a human body approaches the first position;

[0008] A second infrared pair tube circuit, which is arranged at a second position in the entry and exit direction of the entrance and exit; the first infrared pair tube circuit is used to trigger the output of a second trigger signal when a human body approaches the second position;

[0009] A main control circuit. The first input end of the main control circuit is connected to the pyroelectric infrared sensor. The second input end of the main control circuit is connected to the first infrared pair tube circuit. The third input end of the main control circuit is connected to the second infrared pair tube circuit;

[0010] The main control circuit is used to determine that the human body is in the entry state / exit state according to the triggering sequence of the first trigger signal and the second trigger signal when it detects that a human body approaches the entrance and exit according to the human body detection signal.

[0011] In an embodiment, the first infrared pair tube circuit includes an AS8201C infrared pair tube, and / or, the second infrared pair tube circuit includes an AS8201C infrared pair tube.

[0012] In one embodiment, the first infrared pair tube circuit includes:

[0013] A first transmitting tube for transmitting first infrared light;

[0014] A first receiver, the output end of the first receiver is connected to the second input end of the main control circuit; the first receiver is used for receiving the first infrared light reflected by the human body when the human body approaches the first position and outputting a first trigger signal; and / or,

[0015] The second infrared pair tube circuit includes:

[0016] A second transmitting tube for transmitting second infrared light;

[0017] A second receiver, the output end of the second receiver is connected to the third input end of the main control circuit; the second receiver is used for receiving the second infrared light reflected by the human body when the human body approaches the second position and outputting a second trigger signal.

[0018] In one embodiment, the first infrared pair tube circuit further includes a first resistor, a second resistor, a third resistor and a first capacitor;

[0019] Wherein, one end of the first resistor, one end of the first capacitor, the VDD pin of the first receiver are connected to the first power supply end of the first infrared pair tube circuit; the INT pin of the first receiver is connected to the main control circuit; the SDA pin of the first receiver and the other end of the first resistor are connected to the main control circuit; the LED pin of the first receiver is connected to the negative electrode of the first transmitting tube; the positive electrode of the first transmitting tube is connected to one end of the third resistor; the other end of the third resistor and one end of the second resistor are connected to the second power supply end of the first infrared pair tube circuit; the SCL pin of the first receiver and the other end of the second resistor are connected to the main control circuit; the other end of the first capacitor is grounded with the GND pin of the first receiver;

[0020] and / or,

[0021] The second infrared pair tube circuit further includes a fourth resistor, a fifth resistor, a sixth resistor and a second capacitor;

[0022] One end of the fourth resistor, one end of the second capacitor, the VDD pin of the second receiver are connected to the first power supply terminal of the second infrared pair tube circuit; the INT pin of the second receiver is connected to the main control circuit; the SDA pin of the second receiver and the other end of the fourth resistor are connected to the main control circuit; the LED pin of the second receiver is connected to the negative electrode of the second transmitting tube; the positive electrode of the second transmitting tube is connected to one end of the sixth resistor; the other end of the sixth resistor and one end of the fifth resistor are connected to the second power supply terminal of the second infrared pair tube circuit; the SCL pin of the second receiver and the other end of the fifth resistor are connected to the main control circuit; the other end of the second capacitor is grounded with the GND pin of the second receiver.

[0023] In one embodiment, the pyroelectric infrared sensor is a D22AX sensor.

[0024] In one embodiment, the human body welcome device control circuit further includes:

[0025] A voice control circuit, the controlled end of the voice control circuit is connected to the control end of the main control circuit; the voice control circuit is used to play a corresponding welcome voice when the main control circuit determines that a human body is in an entering state / exiting state.

[0026] In one embodiment, the human body welcome device control circuit further includes:

[0027] A key control circuit, the output end of the key control circuit is connected to the fourth input end of the main control circuit, and when the key control circuit is triggered by a user, a volume control signal is input; wherein, the volume control signal is used to adjust the playback volume of the voice control circuit.

[0028] In one embodiment, the human body welcome device control circuit further includes:

[0029] A battery;

[0030] A battery management circuit, the battery management circuit is connected to the battery; the battery management circuit is used to manage the charging / discharging of the battery.

[0031] In one embodiment, the human body welcome device control circuit further includes:

[0032] A battery protection circuit, the battery protection circuit is connected to the battery, and the battery protection circuit is used to protect the working safety of the battery, specifically used to implement at least one of overcharge protection, over-discharge protection, over-current protection and short-circuit protection.

[0033] The present utility model also proposes a human body welcome device, including the human body welcome device control circuit as described above.

[0034] The technical solution of the present utility model adopts a human body welcome device control circuit, including a pyroelectric infrared sensor, a first infrared pair tube circuit, a second infrared pair tube circuit and a main control circuit. Among them, the pyroelectric infrared sensor can detect the human body infrared information near the entrance and exit of the environment and output the corresponding human body detection signal. The first infrared pair tube circuit is arranged at the first position in the entrance and exit direction of the entrance and exit, and can trigger the output of the first trigger signal when a human body approaches the first position. The second infrared pair tube circuit is arranged at the second position in the entrance and exit direction of the entrance and exit, and can trigger the output of the second trigger signal when a human body approaches the second position. When the main control circuit determines that the voltage value exceeds the preset voltage range according to the human body detection signal output by the pyroelectric infrared sensor, it is determined that a customer is approaching the entrance and exit. At this time, if it is preset that when a customer enters, they first approach the first position and then approach the second position, then when the first trigger signal is triggered first and the second trigger signal is triggered later, the main control circuit can determine that the customer is in the entering state. When the second trigger signal is triggered first and the first trigger signal is triggered later, the main control circuit can determine that the customer is in the going-out state. On the contrary, if it is preset that when a customer enters, they first approach the second position and then approach the first position, when the second trigger signal is triggered first and the first trigger signal is triggered later, the main control circuit can determine that the customer is in the entering state. When the first trigger signal is triggered first and the second trigger signal is triggered later, the main control circuit can determine that the customer is in the going-out state. In this way, the present utility model can accurately judge the entrance and exit directions of customers, and solves the problem that the existing human body welcome device cannot accurately judge the entrance and exit directions of customers. Brief Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0036] Figure 1 It is a schematic structural diagram of an embodiment of the human body welcome device control circuit provided by the present utility model;

[0037] Figure 2 It is an electronic circuit diagram of the first infrared pair tube circuit and the second infrared pair tube circuit of an embodiment of the human body welcome device control circuit provided by the present utility model;

[0038] Figure 3 It is an electronic circuit diagram of the voice control circuit of an embodiment of the human body welcome device control circuit provided by the present utility model;

[0039] Figure 4The electronic circuit diagram of the main control circuit, button control circuit and pyroelectric infrared sensor for an embodiment of the human body welcome device control circuit provided by the present utility model;

[0040] Figure 5 The electronic circuit diagram of the battery, battery management circuit and battery protection circuit for an embodiment of the human body welcome device control circuit provided by the present utility model.

[0041] Explanation of the reference numerals in the drawings:

[0042]

[0043]

[0044] The realization, functional characteristics and advantages of the object of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0045] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0047] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0048] It should be noted that currently most commercial human body welcome devices have the problem of being unable to accurately judge the entry and exit directions of customers.

[0049] The present utility model proposes a human body welcome device control circuit.

[0050] Please refer toFigure 1 In an embodiment of the present utility model, the human body welcome device is arranged at the entrance and exit, and the control circuit of the human body welcome device includes:

[0051] A pyroelectric infrared sensor 01, which is used to detect the human body infrared information near the entrance and exit in the environment and output a corresponding human body detection signal.

[0052] It should be noted that when there is no customer entering / leaving, the human body detection signal output by the pyroelectric infrared sensor 01 is near the reference voltage, and the voltage value does not exceed the preset voltage range. When there is a customer entering / leaving, the human body detection signal output by the pyroelectric infrared sensor 01 deviates from near the reference voltage, and the voltage value exceeds the preset voltage range.

[0053] It should be noted that the pyroelectric infrared sensor 01 can be a D22AX sensor, which can improve the sensitivity and sensing distance of human body infrared information detection.

[0054] A first infrared pair tube circuit 02, which is arranged at the first position in the entry and exit direction of the entrance and exit; the first infrared pair tube circuit 02 is used to trigger the output of a first trigger signal when a human body approaches the first position;

[0055] A second infrared pair tube circuit 03, which is arranged at the second position in the entry and exit direction of the entrance and exit; the first infrared pair tube circuit 02 is used to trigger the output of a second trigger signal when a human body approaches the second position.

[0056] It should be noted that the first infrared pair tube circuit 02 and the second infrared pair tube circuit 03 can be set to have the same sensing distance. Among them, it can be preset that when a customer enters, they first approach the first position and then the second position. When the first infrared pair tube circuit 02 first triggers the output of the first trigger signal and the second infrared pair tube circuit 03 then triggers the output of the second trigger signal, it can be determined that the customer is in the entering state. It can be preset that when a customer leaves, they first approach the second position and then the first position. When the second infrared pair tube circuit 03 first triggers the output of the second trigger signal and the first infrared pair tube circuit 02 then triggers the output of the first trigger signal, it can be determined that the customer is in the leaving state.

[0057] On the contrary, if it is preset that when a customer enters, they first approach the second position and then the first position. When the second infrared pair tube circuit 03 first triggers the output of the second trigger signal and the first infrared pair tube circuit 02 then triggers the output of the first trigger signal, it can be determined that the customer is in the entering state. If it is preset that when a customer leaves, they first approach the first position and then the second position. When the first infrared pair tube circuit 02 first triggers the output of the first trigger signal and the second infrared pair tube circuit 03 then triggers the output of the second trigger signal, it can be determined that the customer is in the leaving state.

[0058] It should be noted that in some human body greeting devices capable of determining directions, their costs are often relatively high, the effects are poor, and the response speed is slow. The infrared pairs on the market can only achieve a distance within 0.5 meters and cannot determine directions. In this embodiment, in a feasible implementation manner, the first infrared pair circuit 02 may include an AS8201C infrared pair, and / or, the second infrared pair circuit 03 may include an AS8201C infrared pair. Among them, the AS8201C infrared pair can reach an ultra-long sensing distance of 1.5 meters, and has a fast response speed. In this implementation manner, it can accurately determine the entry state / exit state. Thus, compared with some human body greeting devices capable of determining directions that use ordinary infrared pairs with a distance of only 0.5 meters and a power consumption reaching the mA level, the infrared pair circuit in this implementation manner has a long sensing distance, Figure 4 the maximum sensing distance of the middle infrared pair circuit can reach 1.5 meters, has a fast response speed, can accurately determine the entry state / exit state, and is inexpensive with a power consumption at the μA level.

[0059] The main control circuit 04, the first input end of the main control circuit 04 is connected to the pyroelectric infrared sensor 01, the second input end of the main control circuit 04 is connected to the first infrared pair circuit 02, and the third input end of the main control circuit 04 is connected to the second infrared pair circuit 03; the main control circuit 04 is configured to determine the entry state / exit state of the human body according to the triggering sequence of the first trigger signal and the second trigger signal when detecting that a human body is approaching the entrance / exit based on the human body detection signal.

[0060] It should be noted that please refer to Figure 4 , the main control circuit 04 may include a main control chip U2, and the main control chip U2 may adopt an AS275-1B chip, which has low power consumption, strong stability and anti-interference ability.

[0061] It should be noted that please refer to Figure 4 , the human body greeting device control circuit may further include a warning light circuit, and the warning light circuit may include a first LED lamp LED1 and an eighth resistor R8. The first LED lamp LED1 is connected to the main control chip U2 through the eighth resistor R8, and the warning light circuit can flash to give a warning when the pyroelectric infrared sensor 01 senses that a human body is approaching.

[0062] In this embodiment, when the main control circuit 04 determines that the voltage value exceeds the preset voltage range according to the human body detection signal, it is determined that a customer is approaching the entrance and exit. At this time, if it is preset that when a customer enters, they first approach the first position and then the second position, when the first trigger signal is triggered first and the second trigger signal is triggered later, the main control circuit 04 can determine that the customer is in the entering state. When the second trigger signal is triggered first and the first trigger signal is triggered later, the main control circuit 04 can determine that the customer is in the exiting state. On the contrary, if it is preset that when a customer enters, they first approach the second position and then the first position, when the second trigger signal is triggered first and the first trigger signal is triggered later, the main control circuit 04 can determine that the customer is in the entering state. When the first trigger signal is triggered first and the second trigger signal is triggered later, the main control circuit 04 can determine that the customer is in the exiting state. In this way, this embodiment can accurately judge the entering and exiting directions of customers, and the maximum distance for sensing the entering and exiting directions of customers can reach 1.5 meters, solving the problem that existing human body welcome devices cannot accurately judge the entering and exiting directions of customers.

[0063] In this utility model, when the main control circuit 04 determines that the voltage value exceeds the preset voltage range according to the human body detection signal, it is determined that a customer is approaching the entrance and exit. At this time, if it is preset that when a customer enters, they first approach the first position and then the second position, when the first trigger signal is triggered first and the second trigger signal is triggered later, the main control circuit 04 can determine that the customer is in the entering state. When the second trigger signal is triggered first and the first trigger signal is triggered later, the main control circuit 04 can determine that the customer is in the exiting state. On the contrary, if it is preset that when a customer enters, they first approach the second position and then the first position, when the second trigger signal is triggered first and the first trigger signal is triggered later, the main control circuit 04 can determine that the customer is in the entering state. When the first trigger signal is triggered first and the second trigger signal is triggered later, the main control circuit 04 can determine that the customer is in the exiting state. In this way, this utility model can accurately judge the entering and exiting directions of customers, and the maximum distance for sensing the entering and exiting directions of customers can reach 1.5 meters, solving the problem that existing human body welcome devices cannot accurately judge the entering and exiting directions of customers.

[0064] Please refer to Figure 2 , in an embodiment of this utility model, the first infrared pair tube circuit 02 includes:

[0065] The first emitter TX1, which is used to emit the first infrared light;

[0066] The first receiver RX1, the output end of the first receiver RX1 is connected to the second input end of the main control circuit 04; the first receiver RX1 is used to receive the first infrared light reflected by the human body when the human body approaches the first position and output the first trigger signal; and / or,

[0067] The second infrared pair tube circuit 03 includes:

[0068] The second transmitting tube TX2 is used to transmit the second infrared light;

[0069] The second receiver RX2, the output end of the second receiver RX2 is connected to the third input end of the main control circuit 04; the second receiver RX2 is used to receive the second infrared light reflected by the human body when the human body approaches the second position and output a second trigger signal.

[0070] It should be noted that the first transmitting tube TX1 can emit infrared light. When the human body approaches the first position, the human body reflects this infrared light to the first receiver RX1. The first receiver RX1 receives the reflected light and converts it into a first trigger signal. Similarly, the second transmitting tube TX2 emits another beam of infrared light. When the human body approaches the second position, the second receiver RX2 receives the reflected light and converts it into a second trigger signal.

[0071] Please refer to Figure 2 , in an embodiment of the present invention, the first infrared pair tube circuit 02 further includes a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1. Among them, one end of the first resistor R1, one end of the first capacitor C1, the VDD pin of the first receiver RX1 are connected to the first power supply terminal of the first infrared pair tube circuit 02; the INT pin of the first receiver RX1 is connected to the main control circuit 04; the SDA pin of the first receiver RX1 and the other end of the first resistor R1 are connected to the main control circuit 04; the LED pin of the first receiver RX1 is connected to the negative electrode of the first transmitting tube TX1; the positive electrode of the first transmitting tube TX1 is connected to one end of the third resistor R3; the other end of the third resistor R3 and one end of the second resistor R2 are connected to the second power supply terminal of the first infrared pair tube circuit 02; the SCL pin of the first receiver RX1 and the other end of the second resistor R2 are connected to the main control circuit 04; the other end of the first capacitor C1 is grounded with the GND pin of the first receiver RX1.

[0072] And / or, the second infrared pair tube circuit 03 further includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a second capacitor C2. Among them, one end of the fourth resistor R4, one end of the second capacitor C2, the VDD pin of the second receiver RX2 are connected to the first power supply terminal of the second infrared pair tube circuit 03; the INT pin of the second receiver RX2 is connected to the main control circuit 04; the SDA pin of the second receiver RX2 and the other end of the fourth resistor R4 are connected to the main control circuit 04; the LED pin of the second receiver RX2 is connected to the negative electrode of the second transmitting tube TX2; the positive electrode of the second transmitting tube TX2 is connected to one end of the sixth resistor R6; the other end of the sixth resistor R6 and one end of the fifth resistor R5 are connected to the second power supply terminal of the second infrared pair tube circuit 03; the SCL pin of the second receiver RX2 and the other end of the fifth resistor R5 are connected to the main control circuit 04; the other end of the second capacitor C2 is grounded with the GND pin of the second receiver RX2.

[0073] In this embodiment, the first infrared pair tube circuit 02 / the second infrared pair tube circuit 03 can filter out noise through the configuration of resistors and capacitors, improving signal stability and accuracy. It should be noted that the power of the first infrared light emitted by the first emitter TX1 can be adjusted by adjusting the resistance value of the third resistor R3 to adjust the sensing distance. Similarly, the power of the second infrared light emitted by the second emitter TX2 can be adjusted by adjusting the resistance value of the sixth resistor R6 to adjust the sensing distance. In this way, the first infrared pair tube circuit 02 / the second infrared pair tube circuit 03 of this embodiment has stronger stability, and the sensing distance of the first infrared pair tube circuit 02 / the second infrared pair tube circuit 03 can be adjusted according to actual needs, enhancing the practicability.

[0074] Please refer to Figure 3 , in an embodiment of the present utility model, the human body welcome device control circuit further includes:

[0075] A voice control circuit, the controlled end of the voice control circuit is connected to the control end of the main control circuit 04; the voice control circuit is used to play corresponding welcome voices when the main control circuit 04 determines that a person is in the entering state / leaving state.

[0076] In this embodiment, the voice control circuit may include a speaker SPK, a voice control chip U1, and a third capacitor C3; wherein the controlled end of the voice control chip U1 is connected to the control end of the main control circuit 04. The voice control chip U1 can drive the speaker SPK to emit sound according to the control signal output by the main control circuit 04. For example, when the customer is in the entering state, "Welcome" is broadcasted, and when the customer is in the leaving state, "Welcome back next time" is broadcasted.

[0077] Please refer to Figure 4 , in an embodiment of the present utility model, the human body welcome device control circuit further includes:

[0078] A key control circuit, the output end of the key control circuit is connected to the fourth input end of the main control circuit 04. When the key control circuit is triggered by the user, it inputs a volume control signal; wherein, the volume control signal is used to adjust the playback volume of the voice control circuit.

[0079] In this embodiment, the key control circuit includes a key switch S1. One end of the key switch S1 is grounded, and the other end is connected to the fourth input terminal of the main control circuit 04, that is, the VDD2 pin of the main control chip U2. For example, whenever the user presses the key switch S1 once, the key switch S1 conducts and inputs a low level. Then, the main control chip U2 can control and adjust the set volume according to the volume control signal of the low level. If there are three volume levels in total, with the low volume as the initial level, each time the key switch S1 is pressed, the level is adjusted up one level. For example, pressing once reaches the medium volume, and pressing again reaches the high volume. When pressing again at the high volume, it loops back to the low volume level. In this way, this embodiment can adjust the volume level and can be applicable to entrances and exits of different sizes.

[0080] Please refer to Figure 5 , in an embodiment of the present utility model, the human body welcome device control circuit further includes:

[0081] a battery BAT;

[0082] a battery management circuit, which is connected to the battery BAT; the battery management circuit is used to manage the charging / discharging of the battery BAT.

[0083] It should be noted that the battery management circuit may include an interface chip USB1, a battery management chip U3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a sixth capacitor C6, a seventh capacitor C7, a battery management chip U3, a red LED light LEDR, and a green LED light LEDG. Among them, the battery management chip U3 may specifically be an AS4056 charging chip, and the interface chip USB1 may specifically be a TYPE-C interface, which is connected to an external power supply voltage and can perform protocol matching for power input. Charging is only carried out when the power matching is successful to protect the working safety of the battery management chip U3. The battery management chip U3 can convert the external power supply voltage into a battery charging voltage for input. During the charging process, when the battery management chip U3 detects that the battery power is not full, it controls the red LED light LEDR to light up, and when it detects that the battery power is full, it controls the green LED light LEDG to light up.

[0084] Please refer to Figure 5 , in an embodiment of the present utility model, the human body welcome device control circuit further includes:

[0085] a battery protection circuit, which is connected to the battery BAT. The battery protection circuit is used to protect the working safety of the battery BAT, and specifically is used to implement at least one of overcharge protection, over-discharge protection, over-current protection, and short-circuit protection.

[0086] It should be noted that the battery protection circuit may include a battery protection chip U4, a fourteenth resistor R14, and an eighth capacitor C8. The battery protection chip U4 can determine the current / voltage of the battery BAT during charging / discharging based on the current / voltage input to the VDD pin. Among them, the battery protection chip U4 has a protection switch inside. When the current / voltage of the battery during charging / discharging reaches a preset current threshold / preset voltage threshold, the protection switch is triggered to act to protect the safety of the battery during charging / discharging, and the service life of the battery BAT can be extended.

[0087] The present utility model also provides a human body welcome device, which includes a human body welcome device control circuit. The specific structure of the human body welcome device control circuit refers to the above-mentioned embodiments. Since this human body welcome device adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated herein one by one.

[0088] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the technical concept of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A control circuit for a human body greeting device, the human body greeting device is arranged at the entrance and exit, characterized in that, Comprising: A pyroelectric infrared sensor, configured to detect human body infrared information near an entrance / exit in the environment and output a corresponding human body detection signal; A first infrared pair tube circuit, disposed at a first position in the entry / exit direction of the entrance / exit; The first infrared pair tube circuit is configured to trigger the output of a first trigger signal when a human body approaches the first position; A second infrared pair tube circuit, disposed at a second position in the entry / exit direction of the entrance / exit; the first infrared pair tube circuit is configured to trigger the output of a second trigger signal when a human body approaches the second position; A main control circuit, a first input terminal of the main control circuit is connected to the pyroelectric infrared sensor, a second input terminal of the main control circuit is connected to the first infrared pair tube circuit, and a third input terminal of the main control circuit is connected to the second infrared pair tube circuit; The main control circuit is configured to determine whether the human body is in an entering state / an exiting state according to the triggering sequence of the first trigger signal and the second trigger signal when it detects that a human body approaches the entrance / exit based on the human body detection signal.

2. The human body greeting device control circuit according to claim 1, wherein, The first infrared pair tube circuit includes an AS8201C infrared pair tube, and / or, the second infrared pair tube circuit includes an AS8201C infrared pair tube.

3. The control circuit of the human body greeting device according to claim 1, wherein, The first infrared pair tube circuit includes: A first emitter, configured to emit a first infrared light; A first receiver, an output terminal of the first receiver is connected to the second input terminal of the main control circuit; the first receiver is configured to receive the first infrared light reflected by the human body and output a first trigger signal when the human body approaches the first position; and / or, The second infrared pair tube circuit includes: A second emitter, configured to emit a second infrared light; A second receiver, an output terminal of the second receiver is connected to the third input terminal of the main control circuit; the second receiver is configured to receive the second infrared light reflected by the human body and output a second trigger signal when the human body approaches the second position.

4. The human body greeting device control circuit according to claim 3, characterized in that, The first infrared pair tube circuit further includes a first resistor, a second resistor, a third resistor and a first capacitor; Wherein, one end of the first resistor, one end of the first capacitor, the VDD pin of the first receiver are connected to the first power supply terminal of the first infrared pair tube circuit; the INT pin of the first receiver is connected to the main control circuit; the SDA pin of the first receiver, the other end of the first resistor are connected to the main control circuit; the LED pin of the first receiver is connected to the negative electrode of the first emitter; the positive electrode of the first emitter is connected to one end of the third resistor; the other end of the third resistor, one end of the second resistor are connected to the second power supply terminal of the first infrared pair tube circuit; the SCL pin of the first receiver, the other end of the second resistor are connected to the main control circuit; the other end of the first capacitor is grounded to the GND pin of the first receiver; and / or, The second infrared pair tube circuit further includes a fourth resistor, a fifth resistor, a sixth resistor and a second capacitor; One end of the fourth resistor, one end of the second capacitor, the VDD pin of the second receiver are connected to the first power supply terminal of the second infrared pair tube circuit; the INT pin of the second receiver is connected to the main control circuit; the SDA pin of the second receiver and the other end of the fourth resistor are connected to the main control circuit; the LED pin of the second receiver is connected to the negative electrode of the second transmitting tube; the positive electrode of the second transmitting tube is connected to one end of the sixth resistor; the other end of the sixth resistor and one end of the fifth resistor are connected to the second power supply terminal of the second infrared pair tube circuit; the SCL pin of the second receiver and the other end of the fifth resistor are connected to the main control circuit; the other end of the second capacitor is grounded with the GND pin of the second receiver.

5. The human body welcome device control circuit according to claim 1, characterized in that, The pyroelectric infrared sensor is a D22AX sensor.

6. The human body greeting device control circuit according to claim 1, characterized in that, It further includes: A voice control circuit, the controlled end of the voice control circuit is connected to the control end of the main control circuit; The voice control circuit is configured to play a corresponding welcome voice when the main control circuit determines that a person is in the entering state / leaving state.

7. The human body welcome device control circuit according to claim 6, characterized in that, It further includes: A key control circuit, the output end of the key control circuit is connected to the fourth input end of the main control circuit, and when the key control circuit is triggered by a user, it inputs a volume control signal; wherein, the volume control signal is used to adjust the playing volume of the voice control circuit.

8. The human body welcome device control circuit according to claim 1, wherein, It further includes: A battery; A battery management circuit, the battery management circuit is connected to the battery; The battery management circuit is used to manage the charging / discharging of the battery.

9. The human body welcome device control circuit according to claim 8, characterized in that, It further includes: A battery protection circuit, the battery protection circuit is connected to the battery, and the battery protection circuit is used to protect the working safety of the battery, specifically for implementing at least one of overcharge protection, over-discharge protection, over-current protection and short-circuit protection.

10. A human body greeting device, characterized in that, It includes the human body welcome device control circuit according to any one of claims 1 to 9.

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