阅读说明：本技术 一种用于电子设备的人体感应系统及电子设备 (Human body induction system for electronic equipment and electronic equipment ) 是由 易琪 熊再祥 谢颂婷 后国波 于 2018-07-12 设计创作，主要内容包括：本发明公开了一种人体感应系统,包括与电子设备相连接的主控制芯片、第一逻辑门和N个人体感应装置,每个人体感应装置包括1个热释电红外传感器和1个比较器,电子设备的出光口处设有N个热释电红外传感器；当一个热释电红外传感器正常工作时,向与其连接的比较器输出一电压,且当该电压大于比较器所接入的基准电压时,该比较器的输出引脚才输出高电平信号至第一逻辑门的一个输入端；当第一逻辑门的至少一个输入端接收到高电平信号时,主控制芯片向电子设备发送第一调控信号,以控制电子设备进入人眼保护模式。本发明的所述人体感应系统能在N个热释电红外传感器中的某一个或多个失效时仍可对靠近电子设备的出光口的人体进行人眼保护。(The invention discloses a human body induction system, which comprises a main control chip, a first logic gate and N human body induction devices, wherein the main control chip, the first logic gate and the N human body induction devices are connected with electronic equipment; when one pyroelectric infrared sensor works normally, a voltage is output to a comparator connected with the pyroelectric infrared sensor, and when the voltage is greater than a reference voltage accessed by the comparator, an output pin of the comparator outputs a high level signal to one input end of the first logic gate; when at least one input end of the first logic gate receives a high level signal, the main control chip sends a first regulation and control signal to the electronic equipment so as to control the electronic equipment to enter a human eye protection mode. The human body induction system can still protect human eyes of a human body close to a light outlet of the electronic equipment when one or more of the N pyroelectric infrared sensors fail.)

1. A human body induction system for electronic equipment is characterized in that N pyroelectric infrared sensors are arranged on the electronic equipment, the human body induction system comprises a main control chip, a first logic gate and N human body induction devices, and N is an integer greater than or equal to 2; the first human body induction device is any one of the N human body induction devices; the first logic gate comprises N input ends, the first human body induction device comprises a first pyroelectric infrared sensor, a first reference voltage generator and a first comparator, the electronic equipment comprises a light emitter and a light outlet, the light emitter is used for emitting light from the light outlet, and the first pyroelectric infrared sensor is located at the light outlet; the first comparator comprises a first input pin, a second input pin and an output pin, the second input pin is connected with the output end of the first reference voltage generator, the first input pin is connected with the output end of the first pyroelectric sensor, the output pin of the first comparator is connected to the first input end of the first logic gate, the output end of the first logic gate is connected with the first input end of the main control chip, and the output end of the main control chip is connected with the control end of the electronic equipment; a first input end of the first logic gate is one of the N input ends of the first logic gate corresponding to the first human body induction device;

when the voltage output by the output end of the first pyroelectric sensor is greater than the first reference voltage output by the output end of the first reference voltage generator, the output pin of the first comparator outputs a high-level signal to the first input end of the first logic gate; when at least one input end of the first logic gate receives a high level signal, the first logic gate outputs a first control signal to a first input end of the main control chip, the main control chip sends a first regulation and control signal to the electronic equipment according to the first control signal, and the first regulation and control signal is used for controlling the electronic equipment to enter a human eye protection mode.

2. The body sensing system of claim 1, wherein the first body sensing device further comprises a first buffer, an output of the first comparator is coupled to an input of the first buffer, and an output of the first buffer is coupled to a first input of the first logic gate.

3. The body sensing system of claim 1, wherein the first logic gate is an OR gate or a NOR gate.

4. The body-sensing system according to claim 2, further comprising an and gate, the and gate comprising an output and N inputs, the output of the first buffer being connected to the first input of the and gate, the output of the and gate being connected to the second input of the main control chip;

when the AND gate outputs a second low-level control signal to a second input end of the main control chip, the main control chip sends a second regulation and control signal to the electronic equipment according to the second low-level control signal, and the second regulation and control signal is used for controlling the electronic equipment to enter an alarm interface.

5. The body sensing system of claim 2, further comprising a nand gate, the nand gate comprising an output and N inputs, the output of the first buffer being connected to a first input of the nand gate, the output of the nand gate being connected to a second input of the main control chip;

when the NAND gate outputs a third high-level control signal to the second input end of the main control chip, the main control chip sends a second regulation and control signal to the electronic equipment according to the third high-level control signal, and the second regulation and control signal is used for controlling the electronic equipment to enter an alarm interface.

6. The body sensing system according to claim 2, further comprising an exclusive or gate, wherein the exclusive or gate comprises an output and N inputs, wherein the output of the first buffer is connected to a first input of the exclusive or gate, and wherein the output of the exclusive or gate is connected to a second input of the main control chip;

when the exclusive-or gate outputs a fourth high-level control signal to the second input end of the main control chip, the main control chip sends a second regulation and control signal to the electronic equipment according to the fourth high-level control signal, and the second regulation and control signal is used for controlling the electronic equipment to enter an alarm interface.

7. The body sensing system according to claim 2, further comprising an exclusive-nor gate, the exclusive-nor gate comprising an output and N inputs, the output of the first buffer being connected to a first input of the exclusive-nor gate, the output of the exclusive-nor gate being connected to a second input of the main control chip;

when the exclusive nor gate outputs a fifth low-level control signal to a second input end of the main control chip, the main control chip sends a second regulation and control signal to the electronic equipment according to the fifth low-level control signal, wherein the second regulation and control signal is used for controlling the electronic equipment to enter an alarm interface; and N is 2.

8. The human body induction system according to any one of claims 2 to 7, wherein the first human body induction device further comprises a first failure prompting device, the first failure prompting device comprises a first switch tube, a first failure prompter and a first circuit voltage, wherein a control end of the first switch tube is connected with an output end of the first buffer, a first end of the first switch tube is sequentially connected with the first failure prompter and the first circuit voltage, and a second end of the first switch tube is grounded; when an output pin of the first comparator outputs a high-level signal to the first buffer, the first end and the second end of the first switch tube are connected, and the first failure prompter is triggered to perform normal reminding of the first human body induction device.

9. The body induction system according to claim 2, wherein an inductor is connected in parallel between the input terminal and the output terminal of the first buffer, and the inductor is used for eliminating noise to ensure the reliability of the waveform output from the first buffer.

10. An electronic device comprising a light emitter, a light outlet and a body sensing system according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of consumer electronics, in particular to a human body induction system for electronic equipment and the electronic equipment.

Background

Light emitters in most current electronic devices (e.g., laser projectors) are capable of producing high intensity monochromatic light beams, visible or invisible, such as 400-. In order to prevent human eyes from directly viewing light at a light outlet of an electronic device, a human body sensor is generally arranged beside the light outlet, and when a human body is sensed to approach, corresponding human eye protection measures can be implemented. Among them, the most commonly used human body sensor is a pyroelectric infrared sensor.

However, when the human body sensor fails or the wiring is unstable, the electronic device cannot be triggered to perform corresponding human eye protection measures, and particularly, when a user looks straight at the light outlet for a long time, the eyes of the user can be injured to a certain extent.

Disclosure of Invention

In view of this, the present invention provides a human body sensing system for an electronic device, so as to solve the problem that only one pyroelectric infrared sensor of the existing electronic device cannot sense a human body normally after failure and enables the electronic device to start corresponding human eye protection measures when detecting that the human body approaches.

The invention provides a human body induction system for electronic equipment, which comprises a main control chip, a first logic gate and N human body induction devices, wherein N is an integer greater than or equal to 2; the first human body induction device is any one of the N human body induction devices; the first logic gate comprises N input ends, the first human body induction device comprises a first pyroelectric infrared sensor, a first reference voltage generator and a first comparator, the electronic equipment comprises a light emitter and a light outlet, the light emitter is used for emitting light from the light outlet, and the first pyroelectric infrared sensor is located at the light outlet; the first comparator comprises a first input pin, a second input pin and an output pin, the second input pin is connected with the output end of the first reference voltage generator, the first input pin is connected with the output end of the first pyroelectric sensor, the output pin of the first comparator is connected to the first input end of the first logic gate, the output end of the first logic gate is connected with the first input end of the main control chip, and the output end of the main control chip is connected with the control end of the electronic equipment; a first input end of the first logic gate is one of the N input ends of the first logic gate corresponding to the first human body induction device;

when the voltage output by the output end of the first pyroelectric sensor is greater than the first reference voltage output by the output end of the first reference voltage generator, the output pin of the first comparator outputs a high-level signal to the first input end of the first logic gate; when at least one input end of the first logic gate receives a high level signal, the first logic gate outputs a first control signal to a first input end of the main control chip, the main control chip sends a first regulation and control signal to the electronic equipment according to the first control signal, and the first regulation and control signal is used for controlling the electronic equipment to enter a human eye protection mode.

Optionally, the first logic gate is an or gate nor gate.

Optionally, the first human body induction device further includes a first buffer, an output pin of the first comparator is connected to an input terminal of the first buffer, and an output terminal of the first buffer is connected to a first input terminal of the first logic gate.

Furthermore, an inductor is connected in parallel between the input end and the output end of the first buffer and used for eliminating clutter so as to ensure the reliability of the waveform output by the first buffer.

Optionally, the human body sensing system further comprises an and gate, the and gate comprises an output end and N input ends, the output end of the first buffer is connected to the first input end of the and gate, and the output end of the and gate is connected to the second input end of the main control chip; when the AND gate outputs a second low-level control signal to a second input end of the main control chip, the main control chip sends a second regulation and control signal to the electronic equipment according to the second low-level control signal, and the second regulation and control signal is used for controlling the electronic equipment to enter an alarm interface.

Optionally, the human body sensing system further includes a nand gate, the nand gate includes an output end and N input ends, the output end of the first buffer is connected to the first input end of the nand gate, and the output end of the nand gate is connected to the second input end of the main control chip; when the NAND gate outputs a third high-level control signal to the second input end of the main control chip, the main control chip sends a second regulation and control signal to the electronic equipment according to the third high-level control signal, and the second regulation and control signal is used for controlling the electronic equipment to enter an alarm interface.

Optionally, the human body sensing system further includes an xor gate, the xor gate includes an output end and N input ends, the output end of the first buffer is connected to the first input end of the xor gate, and the output end of the xor gate is connected to the second input end of the main control chip; when the exclusive-or gate outputs a fourth high-level control signal to the second input end of the main control chip, the main control chip sends a second regulation and control signal to the electronic equipment according to the fourth high-level control signal, and the second regulation and control signal is used for controlling the electronic equipment to enter an alarm interface.

Optionally, the N-2.

Optionally, the human body sensing system further includes an exclusive nor gate, the exclusive nor gate includes an output end and N input ends, the output end of the first buffer is connected to the first input end of the exclusive nor gate, and the output end of the exclusive nor gate is connected to the second input end of the main control chip; when the exclusive nor gate outputs a fifth low-level control signal to a second input end of the main control chip, the main control chip sends a second regulation and control signal to the electronic equipment according to the fifth low-level control signal, wherein the second regulation and control signal is used for controlling the electronic equipment to enter an alarm interface; and N is 2.

Optionally, the first human body induction device further includes a first failure prompt device, where the first failure prompt device includes a first switch tube, a first failure prompt, and a first circuit voltage, where a control end of the first switch tube is connected to an output end of the first buffer, a first end of the first switch tube is sequentially connected to the first failure prompt and the first circuit voltage, and a second end of the first switch tube is grounded; when an output pin of the first comparator outputs a high-level signal to the first buffer, the first end and the second end of the first switch tube are connected, and the first failure prompter is triggered to perform normal reminding of the first human body induction device.

Optionally, the first failure prompter comprises one or more of a buzzer and an LED indicator.

The invention further provides an electronic device, which comprises a light emitter, a light outlet and the human body induction system according to the first aspect of the application.

The invention provides a human body induction system for electronic equipment, which comprises a main control chip connected with the electronic equipment, an OR gate and N human body induction devices, wherein each human body induction device comprises 1 pyroelectric infrared sensor and 1 comparator, and N pyroelectric infrared sensors are arranged at a light outlet of the electronic equipment; when one pyroelectric infrared sensor works normally, the pyroelectric infrared sensor can sense that a human body approaches to a light outlet of the electronic equipment, and outputs a voltage to a first input pin of a comparator connected with the pyroelectric infrared sensor, and when the voltage is greater than a reference voltage accessed by a second input pin of the comparator, an output pin of the comparator outputs a high level signal to one input end of the first logic gate; therefore, when one or less than N of the N pyroelectric infrared sensors fails/is unstable in wiring, the human body induction system can still work normally, at least one input end of the first logic gate can receive a high-level signal, the main control chip can still receive a first control signal output by the first logic gate, and then a first regulation and control signal is sent to the electronic equipment to control the electronic equipment to enter a human eye protection mode. The human body induction system can improve the reliability of human eye protection on the human body close to the electronic equipment.

Drawings

FIG. 1 is a schematic structural diagram of a human body sensing system according to the present invention;

FIG. 2 is a schematic diagram of the distribution of pyroelectric infrared sensors at the light exit of the electronic device of the present invention;

FIG. 3 is a schematic diagram of another body sensing system according to the present disclosure;

FIG. 4 is a schematic structural diagram of another human body sensing system disclosed in the present invention;

FIG. 5 is a schematic structural diagram of another human body sensing system disclosed in the present invention;

FIG. 6 is a schematic structural diagram of another human body sensing system disclosed in the present invention;

FIG. 7 is a schematic structural diagram of another human body sensing system disclosed in the present invention;

fig. 8 is a schematic structural diagram of another human body sensing system disclosed by the invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are some, but not all embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive step based on the embodiments in the present application shall fall within the protection scope of the present application.

In addition, the following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that can be used to practice the present application. Directional phrases used in this application, such as, for example, "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer only to the orientation of the appended drawings and are, therefore, used herein for better and clearer illustration and understanding of the application and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified. In the present specification, the term "step" is used to mean not only an independent step but also a step that is not clearly distinguished from other steps, provided that the action intended by the step is achieved. In the present specification, the numerical ranges indicated by "are ranges including the numerical values recited before and after" are respectively the minimum value and the maximum value. In the drawings, elements having similar or identical structures are denoted by the same reference numerals.

The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The invention provides a human body induction system for electronic equipment and the electronic equipment, which can solve the problem that only one pyroelectric infrared sensor on the existing electronic equipment can not enable the electronic equipment to start corresponding human eye protection measures after failure. The following are detailed below.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a human body sensing system according to an embodiment of the present invention. The body sensing system is applied to an electronic device 40, where the electronic device 40 is a device having a light outlet (indicated by an arrow in fig. 1), and may include a light emitter 41, and the light emitter 41 is configured to emit light from the light outlet. The following description will be given with a laser projector as a specific electronic device 40. Of course, the electronic device 40 may also be a medical device, a testing device, or the like. When the electronic device 40 is a laser projector, the laser projector may further include a light guide part (e.g., a prism), and the like, and the light emitter 41 is a laser emitter. The human body induction system comprises a main control chip 30, a first logic gate 20 and N human body induction devices, wherein N is an integer greater than or equal to 2. The number of body sensing devices may be, but is not limited to, 2, 3, 4, 5, or more. For convenience, N ═ 2 is exemplified in the following description of the present invention.

The configuration of the N human body induction devices will be described below by taking, as an example, the first human body induction device 100, where the first human body induction device 100 is any one of the N human body induction devices. The first human body induction device 100 includes a first pyroelectric infrared sensor 11, a first reference voltage generator 12, and a first comparator 13, where the first pyroelectric infrared sensor 11 is located at the light exit. Obviously, the light outlet is provided with N pyroelectric infrared sensors. Alternatively, the N pyroelectric infrared sensors may be radially disposed at the light outlets (as shown by a in fig. 2). Optionally, N/2 pyroelectric infrared sensors are respectively disposed on two sides of the light outlet (as shown in b in fig. 2); wherein N is an even number ≧ 2, preferably, N is an even number ≧ 4.

The first comparator 13 includes a first input pin 131, a second input pin 132, and an output pin 133, the second input pin 132 is connected to the output end of the first reference voltage generator 12, the first input pin 131 is connected to the output end of the first pyroelectric sensor 11, the output pin 133 of the first comparator 13 is connected to a first input end 201 of the first logic gate 20, where the first logic gate 20 includes N input ends and one output end, and the first input end 201 of the first logic gate 20 is one of the N input ends of the first logic gate 20 corresponding to the first human body induction device 100. That is, the output terminals of the comparators in each human body induction device are respectively connected to one input terminal of the first logic gate 20, and they are connected to different input terminals of the first logic gate 20. The output end of the first logic gate 20 is connected to the first input end 301 of the main control chip 30, and the output end of the main control chip 30 is connected to the control end of the electronic device 40.

When a person enters the detection range of the first pyroelectric sensor 11 (for example, gets close to the light exit of the electronic device 40), and when the first pyroelectric sensor 11 can operate normally and the voltage output by the output terminal thereof is greater than the first reference voltage output by the output terminal of the first reference voltage generator 12, the output pin 133 of the first comparator 13 outputs a high level signal to the first input terminal 201 of the first logic gate 20. When the first pyroelectric sensor 11 fails, a high level signal is not output to the first logic gate 20. Similarly, when the second pyroelectric sensor 21 can work normally, the second input 202 of the first logic gate 20 can also receive a high level signal output by the output pin 233 of the second comparator 23.

When at least one input terminal of the first logic gate 20 receives a high level signal (i.e. at least one pyroelectric sensor can work normally), when the first logic gate 20 outputs a first control signal to a first input terminal of the main control chip 30, the main control chip 30 sends a first control signal to the electronic device 40 according to the first control signal, the first control signal is used for controlling the electronic device 40 to enter a human eye protection mode, for example, the light intensity emitted by the light emitter 41 can be reduced, so that the human eye can be prevented from being injured by directly seeing the light outlet, if necessary, the light emitter 41 may also be controlled to be turned off, the electronic device 40, in particular the projector, may project in another mode, such as projecting a prompt interface like "please look directly at the light outlet", "someone is close to the light outlet", etc.

Alternatively, the first logic gate 20 may be a first logic gate, a nor gate, or a circuit that can implement the similar functions.

The first logic gate 20 will be described in detail below as a first logic gate. A first logic gate is a circuit that implements a logical and operation, typically having two or more inputs and one output. The output of the first logic gate is high whenever one of its inputs is high; the output is low only if all inputs are low. For example, when the first pyroelectric sensor 11 normally operates (no matter whether the second pyroelectric sensor 21 can normally operate at this time), the first logic gate may output a first control signal with a high level to the first input terminal 301 of the main control chip 30, the main control chip 30 sends a first regulation signal to the electronic device 40 according to the first control signal with the high level, and the first regulation signal is used to control the electronic device 40 to enter the eye protection mode (as described above), so as to protect the eyes of a person.

Similarly, when the first logic gate 20 is a nor gate, when at least one input terminal thereof receives a high level signal, the first logic gate 20 outputs a first control signal of a low level to the first input terminal of the main control chip 30, thereby triggering the main control chip 30 to control the electronic device 40 to enter the eye protection mode.

Further optionally, the first human body induction device 100 further includes a first buffer 14, the output pin 133 of the first comparator 13 is connected to the input 141 of the first buffer 14, and the output 142 of the first buffer 14 is connected to the first input 201 of the first logic gate 20. In the present invention, the first buffer 14 is used for temporarily storing the high level signal sent from the first comparator 13, so as to output the high level signal to the first input terminal 201 of the first logic gate 20 within a delay time period, thereby avoiding the embarrassment that the eye protection mode is immediately started as soon as a person passes by.

In the human body sensing system described in fig. 1, when one or more (as long as not all) of the N pyroelectric infrared sensors of the N human body sensing devices fail/are unstable in wiring, the human body sensing system can still operate normally, and the main control chip 30 can receive the first control signal output by the first logic gate 20, and further send a first regulation signal to the electronic device 40 to control the electronic device 40 to enter a human eye protection mode. By adopting the human body induction system of the embodiment, the human body close to the light outlet of the electronic equipment can be reliably protected by human eyes, and the problem that corresponding human eye protection measures cannot be started due to the existence of only one pyroelectric infrared sensor and when the pyroelectric infrared sensor fails is avoided.

Referring to fig. 3, fig. 3 is a schematic structural diagram of another human body sensing system disclosed in the embodiment of the present application. The human body sensing system of the present embodiment has substantially the same overall structure and composition as the human body sensing system shown in fig. 1, and the differences include: in the human body sensing system shown in fig. 3, an inductor L1 is further connected in parallel between the input terminal 141 and the output terminal 142 of the first buffer 14. The inductor L1 is used to eliminate noise to ensure the reliability of the waveform output by the first buffer 14 and reduce the interference to the input signals of the or gate 20 and the main control chip 30.

The differences also include: the first reference voltage generator 12 in fig. 3 comprises a first voltage-dividing resistor R11, a second voltage-dividing resistor R12, a third voltage-dividing resistor R13 and a fourth voltage-dividing resistor R14, wherein the first ends of the first voltage-dividing resistor R11 and the fourth voltage-dividing resistor R14 are connected to a power supply voltage V_CCThe second ends of the first divider resistor R11 and the fourth divider resistor R14 are both connected to the second input pin 132, the second end of the first divider resistor R11 is connected to one end of the second divider resistor R12, the second end of the fourth divider resistor R14 is connected to one end of the third divider resistor R13, and the other ends of the second divider resistor R12 and the third divider resistor R13 are grounded. The voltages at the second ends of the first voltage-dividing resistor R11 and the fourth voltage-dividing resistor R14 are the first reference voltage to which the first comparator 13 is connected. Adjusting the first reference voltage mayTo adjust the sensitivity of the first pyroelectric infrared sensor 11. Optionally, the first voltage-dividing resistor R11 is equal to the fourth voltage-dividing resistor R14 (e.g., 1M Ω each), and the second voltage-dividing resistor R12 is equal to the third voltage-dividing resistor R13 (e.g., 47k Ω each). It is understood that in other embodiments of the present invention, the first reference voltage generator 12 may also be directly a voltage source capable of generating the first reference voltage.

In the human body sensing system shown in fig. 3, the first comparator 13 further includes a ground pin (i.e., V)_SSPin) and a power supply pin (Vdd pin); the first buffer 14 further includes a ground terminal and a power supply access terminal 143, and the Vdd pin and the power supply access terminal 143 are both connected to a working voltage Vdd for supplying power, so that the first comparator 13 and the first buffer 14 can work normally. The output pin 133 of the first comparator 13 is also grounded through a fifth resistor R15.

Similar to fig. 1, the human body sensing system described in fig. 3 of the present application can avoid the problem that corresponding human eye protection measures cannot be started when the electronic device fails due to the existence of only one pyroelectric infrared sensor, and can perform highly reliable human eye protection on a human body close to a light outlet of the electronic device.

Referring to fig. 4, fig. 4 is a schematic view of another human body sensing system disclosed in the embodiment of the present application. The overall architecture and composition of the human body sensing system shown in this embodiment are substantially the same as those of the human body sensing system shown in fig. 3, and please refer to the description of fig. 1 and fig. 3 in the above embodiment, which is not repeated herein.

Further, it is distinguished in that, in the human body sensing system shown in fig. 4, the human body sensing system further includes an and gate 50, the and gate 50 includes an output end and N input ends, the output end 142 of the first buffer 14 is connected to a first input end 501 of the and gate 50, and the output end of the and gate 50 is connected to a second input end 302 of the main control chip 30; the first input terminal 501 of the and gate 50 is one of the N input terminals of the and gate 50 corresponding to the first human body induction device.

When the first pyroelectric sensor 11 can work normally and the voltage output by the output terminal thereof is greater than the first reference voltage output by the output terminal of the first reference voltage generator 12, the output pin 133 of the first comparator 13 outputs a high level signal to the first buffer 14, so that the first buffer 14 outputs the high level signal to the first input terminal 201 of the or gate 20 and the first input terminal 501 of the and gate 50, respectively. Similarly, when the second pyroelectric sensor 21 can work normally, the second input 202 of the or gate 20 and the second input 502 of the and gate 50 can also receive the high level signal output by the second buffer 14. When the first pyroelectric sensor 11 fails, no high level signal is output to the or gate 20 and the and gate 50.

The and gate 50 is a circuit that implements a logical "multiply" operation, typically having two or more inputs and one output. The and gate 50 outputs a high level only when all the input terminals of the and gate 50 are high level signals, otherwise the output is a low level. In the present embodiment, when the output of the and gate 50 is at a high level, the main control chip 30 is used to control the electronic device 40 to enter the alarm interface. For example, when the first pyroelectric sensor 11 can operate normally, but the second pyroelectric sensor 21 cannot operate normally, the or gate 20 may still output a first high level control signal to the first input terminal 301 of the main control chip 30, and the and gate 50 outputs a second low level control signal to the second input terminal 302 of the main control chip 30, so that the main control chip 30 can send a first regulation signal to the electronic device 40 according to the first high level control signal and send a second regulation signal to the electronic device 40 according to the second low level control signal, the first control signal may control electronic device 40 to enter a eye protection mode (as described above), the second control signal may control the electronic device 40 to enter an alarm interface (e.g., an alarm indicator functioning as an alarm such as a "|" appearing on a projected picture of the electronic device 40 as a laser projector).

In the human body sensing system depicted in fig. 4, when one or less than N of the N pyroelectric infrared sensors of the N human body sensing devices fail/are unstable, the main control chip 30 can receive the first high level control signal output by the or gate 20, and then control the electronic device 40 to enter the human eye protection mode, and simultaneously the and gate 50 outputs the second low level control signal, and then control the electronic device 40 to enter the alarm interface. In addition, even if N human body induction devices fail, the and gate 50 may still output the second low-level control signal to control the electronic device 40 to enter the alarm interface, for example, through the form of interface display. From the above analysis, it can be known that the human body induction system of the embodiment can better perform more reliable human eye protection on the human body close to the light outlet of the electronic device.

Referring to fig. 5, fig. 5 is a schematic view of another human body sensing system disclosed in the embodiment of the present application. The overall architecture and composition of the human body sensing system shown in this embodiment are substantially the same as those of the human body sensing system shown in fig. 3, and please refer to the description of fig. 1 and fig. 3-4 in the above embodiment, which is not repeated herein.

Further, it is distinguished in that in the human body sensing system shown in fig. 5, the human body sensing system further includes a nand gate 60, the nand gate 60 includes an output end and N input ends, the output end 142 of the first buffer 14 is connected to the first input end 601 of the nand gate 60, and the output end of the nand gate 60 is connected to the second input end 302 of the main control chip 30; the first input 601 of the nand gate 60 is one of the N input terminals of the nand gate 60 corresponding to the first human body induction device.

Nand gate 60 is a circuit that performs an and operation first and then a non-operation, and typically has two or more inputs and one output. The output of nand gate 60 is low only when all its inputs are high; if at least one of the inputs is low, its output is high. In the present embodiment, when the output of the nand gate 60 is at a low level, the main control chip 30 is used to control the electronic device 40 to enter the alarm interface. For example, when the first pyroelectric sensor 11 can normally operate and the second pyroelectric sensor 21 cannot normally operate, the or gate 20 can still output a first high-level control signal to the first input terminal 301 of the main control chip 30, and the nand gate 60 outputs a third high-level control signal to the second input terminal 302 of the main control chip 30, so that the main control chip 30 can send a first regulation and control signal to the electronic device 40 according to the first high-level control signal and send a second regulation and control signal to the electronic device 40 according to the third high-level control signal, the first regulation and control signal can control the electronic device 40 to enter a human eye protection mode, and the second regulation and control signal can control the electronic device 40 to enter an alarm interface, thereby achieving better human eye protection.

In the human body sensing system depicted in fig. 5, when one or less than N of the N pyroelectric infrared sensors of the N human body sensing devices fail/are unstable, the main control chip 30 can receive the first high level control signal output by the or gate 20, and then control the electronic device 40 to enter the human eye protection mode, and simultaneously the nand gate 60 outputs the third high level control signal, and then control the electronic device 40 to enter the alarm interface. In addition, even if N human body induction devices all fail, the nand gate 60 can still output the third high level control signal to control the electronic device 40 to enter the alarm interface. From the above analysis, it can be known that the human body induction system of the embodiment can perform more reliable human eye protection on the human body close to the light outlet of the electronic device.

Referring to fig. 6, fig. 6 is a schematic view of another human body sensing system disclosed in the embodiment of the present application. The overall architecture and composition of the human body sensing system shown in this embodiment are substantially the same as those of the human body sensing system shown in fig. 3, and please refer to the description of fig. 1 and fig. 3 in the above embodiment, which is not repeated herein.

Further, it is distinguished in that in the human body sensing system shown in fig. 6, the human body sensing system further includes an xor gate 70, the xor gate 70 includes an output terminal and N input terminals, the output terminal 142 of the first buffer 14 is connected to the first input terminal 701 of the xor gate 70, and the output terminal of the xor gate 70 is connected to the second input terminal 302 of the main control chip 30; the first input terminal 701 of the xor gate 70 is one of the N input terminals of the xor gate 70 corresponding to the first human body induction device.

The xor gate 70 is a circuit that implements a logical xor operation, typically having two or more inputs and one output. If the two inputs have different levels, the exclusive-or gate outputs a high level, and if the two inputs have the same level, the output is a low level. In the embodiment, when the output of the xor gate 70 is at a high level, the main control chip 30 is used to control the electronic device 40 to enter the alarm interface. For example, when the first pyroelectric sensor 11 can normally operate and the second pyroelectric sensor 21 cannot normally operate, the or gate 20 can still output a first high level control signal to the first input end 301 of the main control chip 30, and the xor gate 70 outputs a fourth high level control signal to the second input end 302 of the main control chip 30, so that the main control chip 30 can send a first regulation and control signal to the electronic device 40 according to the first high level control signal and send a second regulation and control signal to the electronic device 40 according to the fourth high level control signal, the first regulation and control signal can control the electronic device 40 to enter a human eye protection mode, and the second regulation and control signal can control the electronic device 40 to enter an alarm interface, thereby implementing human eye protection.

In the human body sensing system described in fig. 6, when one or less than N (as long as N are not) of N pyroelectric infrared sensors of N human body sensing devices fail/are unstable, the main control chip 30 can receive the first high level control signal output by the or gate 20, and then control the electronic device 40 to enter the human eye protection mode, and simultaneously the xor gate 70 outputs the fourth high level control signal, and then control the electronic device 40 to enter the alarm interface. From the above analysis, it can be known that the human body induction system of the embodiment can reliably protect human eyes of a human body close to the light outlet of the electronic device.

Referring to fig. 7, fig. 7 is a schematic view of another human body sensing system disclosed in the embodiment of the present application. The overall architecture and composition of the human body sensing system shown in this embodiment are substantially the same as those of the human body sensing system shown in fig. 3, and please refer to the description of fig. 1 and fig. 3 in the above embodiment, which is not repeated herein.

Further, it is distinguished in that, in the human body sensing system shown in fig. 7, the human body sensing system further includes an exclusive or gate 80, the exclusive or gate 80 includes an output terminal and N input terminals (N ═ 2), the output terminal 142 of the first buffer 14 is connected to a first input terminal 801 of the exclusive or gate 80, and an output terminal of the exclusive or gate 80 is connected to the second input terminal 302 of the main control chip 30; the first input 801 of the exclusive or gate 80 is one of the N input terminals of the exclusive or gate 80 corresponding to the first human body induction device.

The exclusive nor gate 80, also known as an exclusive nor gate, has two inputs and one output. When the levels of the 2 input ends are the same, the input ends output high levels; when one and only one of the 2 inputs is low (i.e., the other is high), it outputs a low level. In the embodiment, when the output of the exclusive-nor gate 80 is at a low level, the main control chip 30 is used to control the electronic device 40 to enter the alarm interface. For example, when the first pyroelectric sensor 11 can normally operate and the second pyroelectric sensor 21 cannot normally operate, the or gate 20 can still output a first high level control signal to the first input end 301 of the main control chip 30, and the or gate 80 outputs a fifth low level control signal to the second input end 302 of the main control chip 30, so that the main control chip 30 can send a first regulation and control signal to the electronic device 40 according to the first high level control signal and send a second regulation and control signal to the electronic device 40 according to the fifth low level control signal, the first regulation and control signal can control the electronic device 40 to enter a human eye protection mode, and the second regulation and control signal can control the electronic device 40 to enter an alarm interface, thereby implementing human eye protection.

In the human body sensing system described in fig. 7, when one of the pyroelectric infrared sensors of the 2-person body sensing device fails/is unstable in wiring, the main control chip 30 can receive the first high level control signal output by the or gate 20, and then control the electronic device 40 to enter the eye protection mode, and at the same time, the or gate 80 outputs the fifth low level control signal, and then control the electronic device 40 to enter the alarm interface. From the above analysis, it can be known that the human body induction system of the present embodiment can reliably protect human eyes of a human body close to the light outlet of the electronic device.

Referring to fig. 8, fig. 8 is a schematic view of another human body sensing system disclosed in the embodiment of the present application. The overall architecture and composition of the human body sensing system shown in this embodiment are substantially the same as those of the human body sensing system shown in fig. 5, and please refer to the description of fig. 1, fig. 3 and fig. 5 in the above embodiments, which is not repeated herein.

Further, the difference is that in the human body sensing system shown in fig. 8, the first human body sensing device further includes a first failure indication device 15, the first failure indication device 15 includes a first switch tube Q1, a first failure indicator 150 and a first voltage source 151, the first voltage source 151 can generate a circuit voltage VCC, wherein a control end of the first switch tube Q1 is connected to the output end 142 of the first buffer 14, a first end of the first switch tube Q1 is sequentially connected to the first failure indicator 150 and the first voltage source 151, and a second end of the first switch tube Q1 is grounded; when the output pin 133 of the first comparator 13 outputs a high level signal to the first buffer 14, the first end and the second end of the first switch tube Q1 are turned on, and the first failure indicator 150 is triggered to remind that the first human body induction device is normal. Therefore, the failure prompter in the corresponding failure prompter can work only when a certain human body induction device normally operates, and when a certain failure prompter does not work, the failure of the corresponding human body induction device can be indicated.

Optionally, the first failure indicator 150 includes one or more of a buzzer and an LED indicator, but is not limited thereto. Optionally, a first protection resistor R16 is further disposed between the first failure indicator 150 and the first circuit voltage VCC.

In this embodiment, the first switch Q1 is an NMOS transistor or an NPN transistor. If the first switch Q1 is an NPN transistor (as shown in fig. 8), its control terminal is a base, its emitter is grounded, and its collector is sequentially connected to the first failure indicator 150 and the first circuit voltage VCC. If the first switch transistor Q1 is an NMOS transistor, its control terminal is a gate, its source is grounded, and its drain is sequentially connected to the first failure indicator 150 and the first circuit voltage VCC.

Similarly, with the human body sensing system shown in fig. 8, the human body sensing system shown in fig. 5 can perform reliable eye protection on a human body close to the light outlet of the electronic device, and can also perform corresponding indication of failure of a certain human body sensing device, so as to perform timely maintenance/replacement.

The invention also provides electronic equipment which comprises a light emitter and a light outlet, wherein the light emitter emits light from the light outlet, and the electronic equipment also comprises the human body induction system shown in any one of figures 1-8. And will not be described in detail herein.

The human body sensing system and the electronic device provided by the invention are introduced in detail, specific examples are applied in the description to explain the principle and the implementation mode of the application, and the description of the embodiments is only used for helping to understand the method and the core idea of the application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.