CN217116060U

CN217116060U - Infrared induction suspension button device

Info

Publication number: CN217116060U
Application number: CN202123410664.XU
Authority: CN
Inventors: 不公告发明人
Original assignee: Shanghai Yongya Smart Technology Co ltd
Current assignee: Shanghai Yongya Smart Technology Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-08-02
Anticipated expiration: 2031-12-31

Abstract

The utility model relates to an infrared induction suspension button device, which comprises an MCU control system circuit, a level conversion circuit, a power LDO voltage reduction circuit, an LED lamp driving circuit and a plurality of light sensation button modules; every light sense button module includes infrared emission lamp, infrared receiving lamp, transmission drive circuit, infrared received signal amplifier circuit and LED pilot lamp, MCU control system circuit, transmission drive circuit and infrared emission lamp electric connection in proper order, infrared receiving lamp, infrared received signal amplifier circuit and MCU control system circuit connect gradually, the LED pilot lamp is connected with LED lamp drive circuit, power LDO step-down circuit is connected with the DC power, MCU control system circuit, level conversion circuit, infrared received signal amplifier circuit and LED lamp drive circuit respectively with power LDO step-down circuit connection. Compared with the prior art, the utility model discloses prevent the spurious triggering, control multichannel button function, it is with low costs.

Description

Infrared induction suspension button device

Technical Field

The utility model belongs to the technical field of human-computer interaction and specifically relates to an infrared induction suspension button device is related to.

Background

The button is a device that can let human-computer interaction more simply more practical, through many years' development and technical precipitation, and the button control mode in the market at present falls into two main categories: contact and contactless. The contact type is a common control type such as a physical key, a film key, a touch key and the like. The non-contact type is a key mode capable of realizing suspension, and the non-contact type key mainly comprises a capacitive suspension key, an acoustic wave suspension key and an infrared pair tube reflection suspension key.

Capacitive suspension button: the control plate surface is large, and the structural requirement is high. If the panel is made of metal, the panel will fail.

Acoustic wave formula suspension button: the mounting structure is complicated and high in cost, the technology is immature, and the stability is poor.

Infrared geminate transistor reflection suspension button: the function is single, and the precision is low, and the directionality is poor, is easily influenced by the light.

Three kinds of button modes above the contrast, infrared geminate transistors reflection suspension button have absolute advantage in manufacturing cost, but current infrared geminate transistors reflection suspension button lacks the instruction function, lacks the interdynamic with the user, and the user is difficult for noticing after triggering by mistake, and prior art lacks the design of managing a plurality of infrared geminate transistors reflection suspension buttons simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an infrared induction suspension button device in order to overcome the defect that above-mentioned prior art exists, prevent the spurious triggering, control multichannel button function, it is with low costs.

The purpose of the utility model can be realized by the following technical proposal:

an infrared induction suspension key device comprises an MCU control system circuit, a level conversion circuit, a power LDO voltage reduction circuit, an LED lamp driving circuit and a plurality of light sensation key modules;

each light sensation key module comprises an infrared emission lamp, an infrared receiving lamp, an emission driving circuit, an infrared receiving signal amplifying circuit and an LED indicator lamp, the MCU control system circuit, the emission driving circuit and the infrared emission lamp are electrically connected in sequence, the infrared receiving lamp, the infrared receiving signal amplifying circuit and the MCU control system circuit are electrically connected in sequence, and the LED indicator lamp is connected with the LED lamp driving circuit;

the emitting drive circuit is connected with a DC power supply, the power LDO voltage reduction circuit is connected with the DC power supply, and the MCU control system circuit, the level conversion circuit, the infrared receiving signal amplification circuit and the LED lamp drive circuit are respectively connected with the power LDO voltage reduction circuit.

Furthermore, the emission driving circuit comprises an emission control circuit and a single constant current source circuit;

the infrared emission lamp is a light emitting diode RLED, the emission control circuit comprises an NPN triode Q2, a resistor R14 and a capacitor C1, the cathode of the RLED is connected with the collector of the Q2, the anode of the RLED is connected with a DC power supply, one end of the C1 is connected with the anode of the RLED, the other end of the C1 is grounded, one end of the resistor R14 is connected with the base of the Q2, and the other end of the resistor R14 is connected with the MCU control system circuit;

the single-path constant current source circuit comprises an NPN triode Q1, a resistor R38, a resistor R29, a voltage stabilizing source Q13 and a capacitor C15, wherein an emitter of the Q2 is connected with a collector of the Q1, the emitter is grounded after being connected with the R38 in series, a base is grounded after being connected with the R29 in series, the Q13 is TL432, an anode of the Q13 is grounded, a cathode of the Q13 is connected with a base of the Q1, a reference end of the Q13 is connected with the emitter of the Q1, one end of the capacitor C15 is connected with the resistor 29, and the other end of the capacitor C15 is grounded.

Furthermore, the infrared receiving lamp is an infrared receiving triode PT, and the infrared receiving signal amplifying circuit comprises an operational amplifier U2, a resistor R7, a resistor R8, a resistor R28, a resistor R33, a resistor R41, a resistor R53, a capacitor C20, a capacitor C23, a capacitor C27, a capacitor C30 and a capacitor C41;

the emitter of the PT is grounded after being connected with the R33 in series, the collector of the PT is connected with the LDO (low dropout regulator) voltage reduction circuit, one end of the capacitor C23 is connected with the collector of the PT, and the other end of the capacitor C23 is grounded;

one end of the capacitor C41 is connected with an emitter of PT, the other end of the capacitor C41 is connected with a non-inverting input end of U2, one end of the resistor R53 is connected with a non-inverting input end of U2, the other end of the resistor R28 is grounded, one end of the resistor R28 is connected with a non-inverting input end of U2, the other end of the resistor R28 is connected with a LDO voltage reduction circuit, the inverting input end of U2 is grounded after being connected with R8 in series, one end of the R7 is connected with an output end of U2, the other end of the R7 is connected with the inverting input end of U2, the capacitor C20 is connected with the R7 in parallel, a positive power supply of U2 is connected with the LDO voltage reduction circuit, a negative power supply end is grounded, one end of the capacitor C27 is connected with a positive power supply end of U2, the other end of the capacitor R41 is connected with an output end of U2, and the other end of the resistor R6342 is grounded after being connected with C30 in series.

Further, the power supply LDO step-down circuit includes an LDO, a resistor R15, a capacitor C2, a capacitor C3, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C16, an inductor L1, and an inductor L2;

the VIN pin of LDO connects the DC power, electric capacity C14 and electric capacity C16 be the filter capacitance between DC power and the VIN pin, connect the DC power behind the EN pin series connection R15 of LDO, electric capacity C12 and electric capacity C13 be the filter capacitance of the OUT pin of LDO, L1 and C2 constitute and the first LC filter circuit of the OUT pin of LDO, L2 and C3 constitute the second LC filter circuit of the OUT pin of LDO, first LC filter circuit's output be second LC filter circuit's input, first LC filter circuit's output and MCU control system circuit connection, second LC filter circuit's output and infrared receiving signal amplifier circuit connection.

Further, the MCU control system circuit includes a first MCU, a resistor R16, a resistor R17, a capacitor C34, a capacitor C33, a resistor R19, a resistor R18, a capacitor C17, a capacitor C18, and a capacitor C19;

r16 and C34 constitute the RC filter circuit between first MCU and the level shift circuit, R17 and C33 constitute the RC filter circuit between first MCU and the level shift circuit, first MCU and the reset circuit between the level shift circuit, C17 constitute the filter circuit between DC3.3V and the first MCU, C19 constitute the filter circuit between 3.3V analog power supply and the first MCU, R19 and C18 constitute the reset circuit between first MCU and DC3.3V voltage.

Further, the LED lamp driving circuit comprises a second MCU, a resistor R24, a resistor R56, a capacitor C37 and a capacitor C38, the second MCU is connected with the MCU control system circuit through CLK and DAT pins, the R56 and the C37 form an RC filter circuit of the DAT pin of the second MCU, and the R24 and the C38 form an RC filter circuit of the CLK pin of the second MCU.

Further, the level shift circuit comprises an N-MOS transistor Q8, an N-MOS transistor Q14, a resistor R1, a resistor R4, a resistor R5, a resistor R6, a resistor R34, a resistor R35, a capacitor C57 and a capacitor C58;

the gate of Q8 behind the series connection R5 with power LDO step-down circuit connection, the drain electrode is connected with MCU control system circuit, the gate of Q14 behind the series connection R6 with power LDO step-down circuit connection, the drain electrode is connected with MCU control system circuit, R1 and R4 be the pull-up resistance of level shift circuit's input level, C57 be the filter capacitor of input level, R34 and R35 be the pull-up resistance of level shift circuit's output level, C58 be the filter capacitor of output level.

Furthermore, the number of the LED indicating lamps contained in each light sensation key module is two, and the two LED indicating lamps are connected in parallel.

Further, the device still including the installation panel, MCU control system circuit, level conversion circuit, power LDO step-down circuit, LED lamp drive circuit and a plurality of light sense button module locate respectively on the installation panel, a plurality of light sense button module set up at interval side by side.

Furthermore, the mounting panel is made of metal, and the infrared emission lamp and the infrared receiving lamp are embedded in the mounting panel.

Compared with the prior art, the utility model discloses have with following beneficial effect:

(1) the utility model discloses infrared induction suspension button device includes MCU control system circuit, level conversion circuit, power LDO step-down circuit, LED lamp drive circuit and a plurality of light sense button module, every light sense button module includes infrared emission lamp, infrared receiving lamp, transmission drive circuit, infrared received signal amplifier circuit and LED pilot lamp, can realize 1 way to multichannel infrared induction suspension button function control, cooperation pilot lamp sees directly perceivedly whether the operation is accomplished, the interactivity is strong, prevent accidental triggering, the hardware device quantity that the device relates to is less, the device is with low costs;

(2) each path of the emission driving circuit of the utility model comprises an emission control circuit and a single-path constant current source circuit; the infrared emission lamp is a light emitting diode RLED, an NPN triode Q1, a resistor R38, a resistor R29, a voltage stabilizing source Q13 and a capacitor C15 form a precise constant current source circuit, wherein Q13 is TL432 which is a common shunt voltage with high precision and high cost performance, the C1 and the C15 form filter circuits respectively, the voltage ripple coefficient of the infrared emission lamp is reduced, the waveform is smooth, the light emitting diode RLED works stably, and the cost of the single constant current source circuit is low;

(3) the utility model discloses infrared induction suspension button device directly uses the user finger to realize suspending the button function for infrared light reflecting surface, consequently adopts the open-type design, and infrared emission lamp and infrared receiving lamp inlay promptly and establish in the installation panel, and installation panel material is the metal, and a plurality of light sense button module sets up on the installation panel at the interval side by side, compact structure, the installation of being convenient for.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic view of the backside structure of the present invention;

FIG. 3 is a schematic diagram of a transmit control circuit;

FIG. 4 is a schematic diagram of a single constant current source circuit;

FIG. 5 is a schematic diagram of an infrared received signal amplifying circuit;

FIG. 6 is a schematic circuit diagram of an MCU control system;

FIG. 7 is a schematic diagram of an LED lamp driving circuit;

FIG. 8 is a schematic diagram of a power LDO buck circuit;

FIG. 9 is a schematic diagram of a level shift circuit

FIG. 10 is a block diagram of the present invention;

FIG. 11 is a schematic view of the operation of an IR emitter lamp and an IR receiver lamp;

the reference numbers in the figures illustrate:

the LED driving circuit comprises an MCU control system circuit, a level conversion circuit, a power LDO voltage reduction circuit, an LED lamp driving circuit, an infrared emission lamp, an infrared receiving lamp, an emission driving circuit, an infrared receiving signal amplifying circuit, an LED indicator lamp, a DC power output end, an input end and an output end, and a panel is installed, wherein the MCU control system circuit comprises 1, 2, a level conversion circuit, 3, a power LDO voltage reduction circuit, 4, an LED lamp driving circuit, 5, an infrared emission lamp, 6, an infrared receiving lamp, 7, an emission driving circuit, 8, an infrared receiving signal amplifying circuit, 9, an LED indicator lamp, 10, a DC power output end, 11, an input end and an output end, and 12.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

The utility model provides an infrared induction suspension button device, if fig. 1, fig. 2 and fig. 10 are including installation panel 12, MCU control system circuit 1, level converting circuit 2, power LDO step-down circuit 3, LED

lamp drive circuit

4 and 8 light sense button modules, MCU control system circuit 1, level converting circuit 2, power LDO step-down circuit 3, LED lamp drive circuit 4 and a plurality of light sense button module locate respectively on

installation panel

12, 8 light sense button modules set up at interval side by side.

Each light sensation key module comprises an infrared emission lamp 5, an infrared receiving lamp 6, an emission driving circuit 7, an infrared receiving signal amplifying circuit 8 and an LED indicator lamp 9, an MCU control system circuit 1, the emission driving circuit 7 and the infrared emission lamp 5 are electrically connected in sequence, the infrared receiving lamp 6, the infrared receiving signal amplifying circuit 8 and the MCU control system circuit 1 are electrically connected in sequence, and the LED indicator lamp 9 is connected with an LED lamp driving circuit 4;

the emission driving circuit 7 is connected with a DC power supply, the power LDO voltage reduction circuit 3 is connected with the DC power supply, and the MCU control system circuit 1, the level conversion circuit 2, the infrared receiving signal amplification circuit 8 and the LED lamp driving circuit 4 are respectively connected with the power LDO voltage reduction circuit 3.

The mounting panel 12 is made of metal, and the infrared emission lamp 5 and the infrared reception lamp 6 are embedded in the mounting panel 12.

As shown in fig. 8, the power LDO buck circuit 3 includes an LDO, a resistor R15, a capacitor C2, a capacitor C3, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C16, an inductor L1, and an inductor L2; the voltage of the DC power supply is DC5V, a VIN pin of the LDO is connected with the DC power supply, a capacitor C14 and a capacitor C16 are filter capacitors between the DC power supply and the VIN pin, an EN pin of the LDO is connected with the DC power supply after being connected with R15 in series, a capacitor C12 and a capacitor C13 are filter capacitors of an OUT pin of the LDO, the OUT pin outputs DC3.3V voltage, the DC3.3V obtains clean DC3.3V voltage (D3V3) after being filtered by C12 and C13, a first LC filter circuit which is connected with the OUT pin of the LDO is formed by L1 and C2, a second LC filter circuit which is formed by L2 and C3 and forms the OUT pin of the LDO, A3V3 is obtained by the D3V3 after passing through the first LC filter circuit, A3V3 is obtained by the A3V3 after passing through the second LC filter circuit, and A3V3 is sent to the infrared receiving signal amplifying circuit 8 and used for supplying power to the infrared receiving signal amplifying circuit 8.

As shown in fig. 6, the MCU control system circuit 1 includes a first MCU (IC1), a resistor R16, a resistor R17, a capacitor C34, a capacitor C33, a resistor R19, a resistor R18, a capacitor C17, a capacitor C18, and a capacitor C19; the first MCU integrates 32kB Flash, 6kB SRAM, 8kB SysROM and 1 URAT (or IIC communication interface), R16 and C34 form an RC filter circuit between the first MCU and the level conversion circuit 2 to filter interference signals for the SCL (or RX) of the level conversion circuit 2, R17 and C33 form an RC filter circuit between the first MCU and the level conversion circuit 2 to filter interference signals for the SDA (or TX) of the level conversion circuit 2, a reset circuit between the first MCU and the level conversion circuit 2, C17 forms a filter circuit between D3V3 and the first MCU, C19 forms a filter circuit between a 3.3V analog power supply and the first MCU, and R19 and C18 form a reset circuit between the first MCU and DC3.3V voltage.

As shown in fig. 3 and 4, the transmission driving circuit 7 has 8 paths, and each transmission driving circuit 7 includes a transmission control circuit and a single constant current source circuit; the infrared emission lamp 5 is a light emitting diode RLED, the wavelength is 940nm, the emission control circuit comprises an NPN triode Q2, a resistor R14 and a capacitor C1, the cathode of the RLED is connected with the collector of the Q2, the anode of the RLED is connected with a DC power supply, one end of the C1 is connected with the anode of the RLED, the other end of the C1 is grounded, one end of the resistor R14 is connected with the base of the Q2, and the other end of the resistor R14 is connected with the MCU control system circuit 1; the single-path constant current source circuit comprises an NPN triode Q1, a resistor R38, a resistor R29, a voltage stabilizing source Q13 and a capacitor C15, wherein an emitter of Q2 is connected with a collector of the Q1, the emitter is grounded after being connected with the R38 in series, a base is grounded after being connected with the R29 in series, the R38 adopts a high-precision and low-temperature drift resistor, the Q13 is TL432 which is a common shunting voltage with high precision and high cost performance, an anode of the Q13 is grounded, a cathode is connected with a base of the Q1, a reference end is connected with the emitter of the Q1, one end of the capacitor C15 is connected with the resistor 29, and the other end of the capacitor C15 is grounded; c1 and C15 constitute filter circuit respectively, reduce the voltage ripple coefficient of infrared emission lamp RLED1 all the way, the wave form is smooth, IRLED1 is that the control end of infrared emission drive circuit all the way is connected to first MCU's No. 26 pin, when first MCU control IRLED1 produced PWM wave form, then the lamp pearl of RLED1 sends infrared light simultaneously, reaches the purpose that is controlled simultaneously, 7 the principle of remaining way transmission drive circuit 7 is the same with way 1.

As shown in fig. 5, the infrared receiving signal amplifying circuit 8 has 8 circuits (matching the infrared emitting lamp 5, forming a 1-to-1 control circuit), and includes an operational amplifier U2, a resistor R7, a resistor R8, a resistor R28, a resistor R33, a resistor R41, a resistor R53, a capacitor C20, a capacitor C23, a capacitor C27, a capacitor C30, and a capacitor C41; the infrared receiving lamp 6 is an infrared receiving triode PT, an emitter of a first infrared receiving triode PT1 is connected with R33 in series and then grounded, a collector is connected with the LDO voltage-reducing circuit 3 of the power supply, one end of a capacitor C23 is connected with the collector of the PT, the other end of the capacitor C41 is connected with the emitter of the PT, the other end of the capacitor C41 is connected with the non-inverting input end of U2, one end of a resistor R53 is connected with the non-inverting input end of U2, the other end of the resistor C41 and R53 are grounded, a passive high-pass filter circuit is formed by the resistor R28, one end of the resistor R28 is a pull-up resistor, one end of the resistor R28 is connected with the non-inverting input end of U2, the other end of the resistor R2 is connected with the LDO voltage-reducing circuit 3 of the power supply, the inverting input end of U2 is connected with R8 in series and then grounded, an operational amplifier (U2) is a core device for amplifying small signals, one end of R7 is connected with the output end of U2, the other end of the non-inverting input end of U2, a filter capacitor C20 is connected in parallel with R7, the LDO of U2 is connected with the voltage-reducing circuit 3 of the power supply, the negative power supply end is grounded, one end of a capacitor C27 is connected with the positive power supply end of the U2, the other end of the capacitor C27 is grounded, one end of a resistor R41 is connected with the output end of the U2, the other end of the resistor R41 is grounded after being connected with the C30 in series, the voltage series negative feedback amplifying circuit is integrally formed, and the R41 and the C30 form a low-pass filter circuit and then sample the voltage to the pin 6 of the first MCU. When PT1 receives 940nm wavelength infrared light, it internally generates photocurrent, which is converted into small voltage signal by R33.

The LED lamp driving circuit 4 comprises a second MCU (IC2), a resistor R24, a resistor R56, a capacitor C37 and a capacitor C38, the second MCU is connected with the first MCU through CLK and DAT pins, the problem of uneven brightness in the process of perfectly solving the problem that the IO of the MCU is insufficient and the LED indicator lamp 9 is controlled by constant current is solved, R56 and C37 form an RC filter circuit of the DAT pin of the second MCU, and R24 and C38 form an RC filter circuit of the CLK pin of the second MCU.

The LED indicating lamps 9 are light emitting diodes and play a role in backlight display, the number of the LED indicating lamps 9 contained in each light sensation key module is two, the two LED indicating lamps 9 are connected in parallel, and each LED lamp driving circuit 4 controls the two LED indicating lamps 9 to be turned on and off, so that 16 LED indicating lamps 9 are provided, namely LEDs 1-LEDs 16.

As shown in fig. 9, the level shifter circuit 2 includes an N-MOS transistor Q8, an N-MOS transistor Q14, a resistor R1, a resistor R4, a resistor R5, a resistor R6, a resistor R34, a resistor R35, a capacitor C57, and a capacitor C58; the gate of Q8 is connected with power LDO step-down circuit 3 after being connected with R5 in series, the drain is connected with MCU control system circuit 1, the gate of Q14 is connected with power LDO step-down circuit 3 after being connected with R6 in series, the drain is connected with MCU control system circuit 1, R1 and R4 are the pull-up resistance of the input level of level shift circuit 2, C57 is the filter capacitor of the input level, R34 and R35 are the pull-up resistance of the output level of level shift circuit 2, and C58 is the filter capacitor of the output level. The level shift circuit 2 can meet the communication frequency of 400KHz for IIC fast communication, SDA _ IIC & TX and SCL _ IIC & RX are respectively connected to pins 28 and 27 of the first MCU, and SDA _ IIC & TX _ IO and SCL _ IIC & RX _ IO are communicated with the outside through the connector.

The working principle of the infrared induction suspension key device is as follows:

an external power supply can input a (5V) direct-current voltage power supply and is divided into two paths, wherein one path of DC5V is subjected to voltage reduction through a power LDO voltage reduction circuit 3 to output 3.3V direct-current voltage to be supplied to an MCU control system circuit 1 and an infrared receiving signal amplifying circuit 8, the other path of DC5V is subjected to filtering through C14 and C16 to be supplied to a transmitting drive circuit 7 and an LED lamp drive circuit 4, after the power supply is on, a first MCU sends out a PWM (pulse width modulation) control signal from an RLED1 pin to drive the first path of the transmitting drive circuit 7 to work, so that an infrared transmitting lamp RLED1 sends out infrared light, and simultaneously a signal receiving channel of the infrared receiving signal amplifying circuit 8 of PT1 is opened, as shown in figure 11, when a finger is suspended on the RLED1, the infrared light of the RLED1 is reflected to the PT1 to receive an infrared signal, a PT1 receiving lamp converts the received infrared signal into a current signal, and samples are obtained through a pin 6 of the first MCU after the infrared receiving signal amplifying circuit 8, the 12-bit AD sampling circuit in the first MCU is converted into a corresponding 0-4095 numerical value, a useful signal can be obtained through internal algorithm processing, the closer the finger is to the RLED1, the larger the infrared signal quantity is, the larger the AD value is obtained, and therefore the action signal of pressing the key by the finger is captured. This is a 1-channel received signal processing procedure. Similarly, after the 1 st channel finishes transmitting and receiving, the 2 nd channel transmits and receives after an interval of a period of time until the 8 th channel, the first MCU obtains the position of a finger according to the received multipath infrared signals, and simultaneously the first MCU enables the LED lamp driving circuit 4 to light the corresponding LED indicator lamp 9 by controlling CLK and DATA pins, the first MCU outputs IIC signals or Uart signals at SDA and SCL pins, and the IIC signals or the Uart signals are converted into 5V voltage (level) signals through a level conversion circuit and output to external equipment.

This embodiment has provided an infrared induction suspension button device, and suspension response distance can reach 20mm, can realize realizing suspending under the condition of contactless button to the control of equipment, and cooperation pilot lamp 9 sees the operation directly perceivedly and whether accomplishes, prevents the spurious triggering, can realize 1 way to multichannel button function, and the hardware device quantity that infrared induction suspension button device relates to is less, and is with low costs.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention by those skilled in the art should be within the scope of protection defined by the claims.

Claims

1. An infrared induction suspension key device is characterized by comprising an MCU control system circuit (1), a level conversion circuit (2), a power LDO voltage reduction circuit (3), an LED lamp driving circuit (4) and a plurality of light sensation key modules;

each light sensation key module comprises an infrared emission lamp (5), an infrared receiving lamp (6), an emission driving circuit (7), an infrared receiving signal amplification circuit (8) and an LED indicator lamp (9), the MCU control system circuit (1), the emission driving circuit (7) and the infrared emission lamp (5) are electrically connected in sequence, the infrared receiving lamp (6), the infrared receiving signal amplification circuit (8) and the MCU control system circuit (1) are electrically connected in sequence, and the LED indicator lamp (9) is connected with the LED lamp driving circuit (4);

the emitting drive circuit (7) is connected with a DC power supply, the power LDO voltage reduction circuit (3) is connected with the DC power supply, and the MCU control system circuit (1), the level conversion circuit (2), the infrared receiving signal amplification circuit (8) and the LED lamp drive circuit (4) are respectively connected with the power LDO voltage reduction circuit (3).

2. The infrared induction suspension key device as claimed in claim 1, wherein said emission driving circuit (7) comprises an emission control circuit and a single constant current source circuit;

the infrared emission lamp (5) is a light emitting diode RLED, the emission control circuit comprises an NPN triode Q2, a resistor R14 and a capacitor C1, the negative electrode of the RLED is connected with the collector of the Q2, the positive electrode of the RLED is connected with a DC power supply, one end of the C1 is connected with the positive electrode of the RLED, the other end of the C1 is grounded, one end of the resistor R14 is connected with the base of the Q2, and the other end of the resistor R14 is connected with the MCU control system circuit (1);

3. The infrared induction suspension key device according to claim 1, wherein the infrared receiving lamp (6) is an infrared receiving transistor PT, and the infrared receiving signal amplifying circuit (8) comprises an operational amplifier U2, a resistor R7, a resistor R8, a resistor R28, a resistor R33, a resistor R41, a resistor R53, a capacitor C20, a capacitor C23, a capacitor C27, a capacitor C30 and a capacitor C41;

the emitter of the PT is grounded after being connected with R33 in series, the collector of the PT is connected with the LDO (low dropout regulator) voltage reduction circuit (3), one end of the capacitor C23 is connected with the collector of the PT, and the other end of the capacitor C23 is grounded;

one end of a capacitor C41 is connected with an emitter of a PT, the other end of the capacitor C41 is connected with a non-inverting input end of a U2, one end of a resistor R53 is connected with the non-inverting input end of the U2, the other end of the resistor R28 is grounded, one end of the resistor R28 is connected with the non-inverting input end of the U2, the other end of the resistor R28 is connected with a power LDO step-down circuit (3), the inverting input end of the U2 is grounded after being connected with the R8 in series, one end of the R7 is connected with an output end of the U2, the other end of the R7 is connected with the inverting input end of the U2, the capacitor C20 is connected with the R7 in parallel, a positive power supply end of the U2 is connected with the power LDO step-down circuit (3), a negative power supply end of the capacitor C27 is grounded, one end of the capacitor C27 is connected with a positive power supply end of the U2, the other end of the capacitor R41 is connected with the output end of the U2, and the other end of the resistor R30 is grounded after being connected with the power in series.

4. The infrared induction suspension key device as claimed in claim 1, wherein the power supply LDO voltage reduction circuit (3) comprises an LDO, a resistor R15, a capacitor C2, a capacitor C3, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C16, an inductor L1 and an inductor L2;

the VIN pin of LDO connects the DC power, electric capacity C14 and electric capacity C16 be the filter capacitance between DC power and the VIN pin, connect the DC power behind the EN pin series connection R15 of LDO, C12 and C13 be the filter capacitance of the OUT pin of LDO, L1 constitute with C2 with the first LC filter circuit of the OUT pin of LDO, L2 and C3 constitute the second LC filter circuit of the OUT pin of LDO, the output of first LC filter circuit be the input of second LC filter circuit, the output of first LC filter circuit be connected with MCU control system circuit (1), the output of second LC filter circuit be connected with infrared received signal amplifier circuit (8).

5. The infrared induction suspension key device as claimed in claim 4, wherein the MCU control system circuit (1) comprises a first MCU, a resistor R16, a resistor R17, a capacitor C34, a capacitor C33, a resistor R19, a resistor R18, a capacitor C17, a capacitor C18 and a capacitor C19;

r16 and C34 constitute the RC filter circuit between first MCU and level shift circuit (2), R17 and C33 constitute the RC filter circuit between first MCU and level shift circuit (2), the reset circuit between first MCU and level shift circuit (2), C17 constitute the filter circuit between DC3.3V and the first MCU, C19 constitute the filter circuit between 3.3V analog power supply and the first MCU, R19 and C18 constitute the reset circuit between first MCU and DC3.3V voltage.

6. The infrared induction suspension key device as claimed in claim 1, wherein the LED lamp driving circuit (4) comprises a second MCU, a resistor R24, a resistor R56, a capacitor C37 and a capacitor C38, the second MCU is connected with the MCU control system circuit (1) through CLK and DAT pins, the R56 and C37 form an RC filter circuit of the DAT pin of the second MCU, and the R24 and C38 form an RC filter circuit of the CLK pin of the second MCU.

7. The infrared induction suspension key device as claimed in claim 1, wherein the level shift circuit (2) comprises an N-MOS transistor Q8, an N-MOS transistor Q14, a resistor R1, a resistor R4, a resistor R5, a resistor R6, a resistor R34, a resistor R35, a capacitor C57 and a capacitor C58;

the gate of Q8 connect with power LDO step-down circuit (3) after establishing ties R5, the drain electrode is connected with MCU control system circuit (1), the gate of Q14 connect with power LDO step-down circuit (3) after establishing ties R6 and be connected, the drain electrode is connected with MCU control system circuit (1), R1 and R4 be the pull-up resistance of the input level of level shift circuit (2), C57 be the filter capacitance of input level, R34 and R35 be the pull-up resistance of the output level of level shift circuit (2), C58 be the filter capacitance of output level.

8. The infrared induction suspension key device as claimed in claim 1, wherein each light sensation key module comprises two LED indicator lights (9), and the two LED indicator lights (9) are connected in parallel.

9. The infrared induction suspension key device as claimed in claim 1, further comprising a mounting panel (12), wherein the MCU control system circuit (1), the level shift circuit (2), the power LDO step-down circuit (3), the LED lamp driving circuit (4) and the plurality of light sensing key modules are respectively disposed on the mounting panel (12), and the plurality of light sensing key modules are disposed side by side at intervals.

10. The infrared induction suspended key device as claimed in claim 9, wherein the mounting panel (12) is made of metal, and the infrared emission lamp (5) and the infrared receiving lamp (6) are embedded in the mounting panel (12).