CN215869135U - Communication switch - Google Patents

Abstract

A communication switch, a shell, an electronic component board, a power supply connecting terminal and a switch connecting terminal which are arranged in the shell, the electronic component board is provided with a wireless communication module, a switch module and a power supply module, the power supply wiring terminal is connected with the power supply module, the power supply module supplies power for the wireless communication module and the switch module, the two switch wiring terminals are respectively connected with the switch module, the wireless communication module can control the switch module to switch on and off the two switch wiring terminals, the wireless communication module and the upper computer interactively generate signals to carry out on-off control and parameter configuration, the parameter configuration does not need to spend a great deal of time, the use is very convenient, and the wireless communication module, the switch module and the power module are all integrated on one electronic component board, and the wireless communication module has the characteristics of small volume, simple process and high reliability.

Description

Communication switch

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to a communication switch.

Background

At present, the switch equipment control equipment such as a time relay and a time control switch in the market has various varieties and complex functions and also has the following defects:

(1) when the existing time relay and time control switch are used, the remote control cannot be realized, a large amount of time is needed for parameter configuration, and the use difficulty is high;

(2) the existing time relay and time control switch electronic component board is large in size, because the switch module is generally a small relay, and is isolated from other devices in order to match with the appearance structure, two circuit boards are generally spliced, so that the size is large, the process is complex, and the reliability is low;

(3) current time relay and time control switch generally are individual layer wiring structure, the multilayer wiring structure of the current domestic contactor of unable perfect cooperation, and the binding post that is used for connecting power and switch of single line wiring structure is in same layer, and multilayer wiring structure for the binding post of connecting the power is in the lower floor, and the auxiliary terminal that is used for connecting the coil can bring inconveniently for the wiring on the upper strata.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a communication switch with simple structure and high reliability.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a communication switch, casing 1 and electronic component board 2, power binding post 16 and the switch binding post 15 of setting in casing 1, be equipped with wireless communication module 4, switch module 5 and power module 6 on the electronic component board 2, power binding post 16 is connected with power module 6, and power module 6 does wireless communication module 4 and switch module 5 power supply, two switch binding post 15 is connected with switch module 5 respectively, wireless communication module 4 can control switch module 5 and switch on and off two switch binding post 15.

Preferably, the power supply connection terminal 16 and the switch connection terminal 15 are arranged at different heights of the electronic component board 2.

Preferably, the electronic component board 2 is provided with two power connection holes 26 and two switch connection holes 25, and the terminal boards 13 of the switch connection terminals 15 and the power connection terminals 16 are respectively in plugging fit with the power connection holes 26 and the two switch connection holes 25.

Preferably, the switch module 5 is disposed on one side of the electronic component board 2, the wireless communication module 4 and the power module 6 are disposed on one side of the electronic component board 2 far away from the switch module 5, and the wireless communication module 4 is disposed above the power module 6.

Preferably, the wireless communication module 4 includes a WIFI communication chip.

Preferably, the switch module 5 is a micro relay.

Preferably, the power module 6 includes a first voltage conversion circuit and a second voltage conversion circuit, and the first voltage conversion circuit and the second voltage conversion circuit convert the power module 6 into different voltages and respectively supply power to the switch module 5 and the wireless communication module 4.

Preferably, the WIFI communication chip is a patch chip, one end of the WIFI communication chip, which is provided with the PCB antenna, extends to the top of the electronic component board 2, and one end of the WIFI communication chip, which is far away from the PCB antenna, is fixed on the electronic component board 2.

Preferably, the first pin and the second pin of the WIFI communication chip are respectively connected to the power module 6 through a resistor R10 and a resistor R11, the eighth pin of the WIFI communication chip is respectively connected to a capacitor C8, electric capacity C9 and power module 6 are connected, electric capacity C8 and electric capacity C9's the other end ground connection, the sixteenth pin of WIFI communication chip is through resistance R9 ground connection, the fifteenth pin ground connection of WIFI communication chip, the eighteenth pin of WIFI communication chip is received and is sent out photodiode LED2 negative pole, photodiode LED2 positive pole is connected with power module 6 through resistance R8, the twentieth pin of WIFI communication chip is connected with triode Q1's base through resistance R14, triode Q1's projecting pole ground connection, triode Q1's collecting electrode with switch module 5 connects, triode Q1 is used for controlling power module 6 and supplies power for switch module 5, the WIFI communication chip passes through triode Q1's break-make, and-make of control switch module 5.

Preferably, the switch module 5 includes a moving contact and an electromagnetic coil for controlling the moving contact to act, the moving contact is connected between a first output terminal K1 and a second output terminal K2 of the switch module 5, the first output terminal K1 and the second output terminal K2 are respectively connected with two switch connecting holes 25 on the electronic circuit board, one end of the electromagnetic coil is connected with the power module 6, the other end of the electromagnetic coil is grounded through a triode Q1, the base of the triode Q1 is connected with the wireless communication module 4, and two ends of the electromagnetic coil are connected in parallel with a diode D3.

Preferably, the first voltage conversion circuit comprises a voltage dependent resistor VR1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, an inductor L1, a diode D1, a diode D2, a rectifier bridge BR1 and a voltage reduction chip U1; the voltage dependent resistor VR1 is connected in parallel between a live wire and a zero wire of a power supply, the zero wire of the power supply is connected at a first input end of a rectifier bridge BR1, the live wire of the power supply is connected to a second input end of the rectifier bridge VR1 through a resistor R1, a capacitor C1 and a resistor R2 are connected in parallel between two output ends of a rectifier bridge BR1, a fourth output end of the rectifier bridge BR1 is connected to a fourth pin of a voltage reduction chip U1, a third output end of the rectifier bridge BR1 is grounded, a fifth pin, a sixth pin, a seventh pin and an eighth pin of the voltage reduction chip U1 are respectively connected with a capacitor C2, an inductor L1 and a cathode of a diode D2, an anode of the diode D2 is grounded, the other end of the capacitor C2 is connected to a resistor R3 and an anode of the diode D1, a cathode of the diode D1 is connected with the other end of an inductor L1, the other end of the resistor R3 is respectively connected to a second pin of the voltage reduction chip U1 and one end of the resistor R4, and the other end of the resistor R4 are respectively connected to a fifth pin of the capacitor C3 and a fifth pin of the voltage reduction chip U1, The other end of the capacitor C3 is connected to the first pin of the voltage reduction chip U1, the negative electrode of the capacitor C4 is grounded, and the positive electrode of the capacitor C4 is the output potential of the first voltage conversion circuit;

the second voltage conversion circuit comprises a resistor R5, a resistor R6, a resistor R7, a capacitor C5, a capacitor C6, a capacitor C7, an inductor L2, a diode D4, a voltage reduction chip U2 and a light-emitting diode LED 1; the capacitor C5 is connected in parallel to two ends of the capacitor C4, the positive electrode of the capacitor C4 is connected to the first pin of the buck chip U2, the second pin of the buck chip U2 is connected with the inductor L2 and the negative electrode of the diode D4 respectively, the third pin of the buck chip U2 is connected with the resistor R5 and the resistor R6 respectively, the node at which the other end of the resistor R5 is connected with the inductor L2 is the 3.3V output potential of the second voltage conversion circuit, the other end of the resistor R6, the positive electrode of the diode D4 and the fourth pin of the buck chip U2 are grounded respectively, and after the resistor R7 and the light emitting diode LED1 are connected in series, the capacitor C6 and the capacitor C7 are connected in parallel between the 3.3V output potential of the second voltage conversion circuit and the ground terminal respectively.

The communication switch provided by the invention has the advantages that the wireless communication module 4 and an upper computer interactively generate signals to carry out on-off control and parameter configuration, a large amount of time is not needed for parameter configuration, the use is very convenient, the wireless communication module 4, the switch module 5 and the power supply module 6 are integrated on one electronic component board 2, and the communication switch further has the characteristics of small volume, simple process and high reliability.

In addition, power supply terminal 16 and switch terminal 15 set up on the different heights of electronic component board 2, and power supply terminal 16 and the switch terminal 15 that highly differ constitute multilayer wiring structure, can the current domestic contactor of perfect adaptation. And power supply terminal 16 and switch terminal 15 are pegged graft spacing and the electricity is connected with electronic component board 2, convenient assembling.

Drawings

FIG. 1 is a schematic diagram of the internal structure of the communication switch of the present invention;

fig. 2 is a schematic structural diagram of the inventive switch terminal;

FIG. 3 is a schematic structural view of the power connection terminal of the present invention;

FIG. 4 is a circuit layout of one side of the inventive electronic assembly board;

FIG. 5 is a circuit layout diagram of the other side of the inventive electronic component board;

FIG. 6 is a circuit diagram of the 12V conversion circuit of the inventive power module;

FIG. 7 is a circuit diagram of the 3.3V conversion circuit of the inventive power module;

fig. 8 is a circuit diagram of the wireless communication module according to the invention;

fig. 9 is a circuit diagram of the inventive switch module.

Detailed Description

The following describes the communication switch according to the present invention with reference to the embodiments shown in fig. 1 to 9. The communication switch of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-5, the communication switch provided by the invention comprises a housing 1, and an electronic component board 2, a power connection terminal 16 and a switch connection terminal 15 which are arranged in the housing 1, wherein a wireless communication module 4, a switch module 5 and a power module 6 are arranged on the electronic component board 2, the power connection terminal 16 is connected with the power module 6, the power module 6 supplies power to the wireless communication module 4 and the switch module 5, the two switch connection terminals 15 are respectively connected with the switch module 5, and the wireless communication module 4 can control the switch module 5 to switch on and off the two switch connection terminals 15.

The communication switch provided by the invention can generate signals to carry out on-off control and parameter configuration by interaction with an upper computer through the wireless communication module 4, does not need to spend a large amount of time for parameter configuration, is very convenient to use, and has the characteristics of small volume, simple process and high reliability because the wireless communication module 4, the switch module 5 and the power module 6 are integrated on one electronic component board 2. The time relay and the time control switch can be used for time relays and time control switches applied to the Internet of things, and can be used as other network switches.

As shown in fig. 4 to 5, the power terminals 16 and the switch terminals 15 are disposed at different heights of the electronic component board 2, and the power terminals 16 and the switch terminals 15 having different heights constitute a multi-layered wiring structure, which can be perfectly adapted to the existing household contactor. As shown in fig. 2 and 3, the structure of the switch terminal 15 and the power terminal 16 is respectively basically the same, the power terminal 16 is used for connecting a household power line, the switch terminal 15 is used for connecting a coil of a household ac contactor, and the closing and opening of the coil of the household ac contactor are controlled. Taking the switch terminal block 15 of fig. 2 as an example, the switch terminal block 15 of the present embodiment includes a terminal frame 11, a terminal screw 12, and a terminal block 13, the terminal block 13 can be inserted inside the terminal frame 11 in parallel with the bottom surface of the terminal frame 11, the terminal screw 12 is inserted inside the terminal frame 11 perpendicularly to the terminal block 13, and the terminal screw 12 can press an external wire against the terminal block 13 to fix the external wire (not shown in the figure).

Further, the electronic component board 2 is provided with a connecting hole matched with the wiring board 13, the wiring board 13 is provided with a convex block 14 at the side close to the electronic component board 2, the connecting hole and the corresponding wiring board 13 are located at the same height, and the convex block 14 can be inserted into the corresponding connecting hole for limiting and electrically connecting. Specifically, the electronic component board 2 is provided with two power connection holes 26, the two power connection holes 26 are respectively connected with two input ends of the power module 6, and the two power connection terminals 16 are respectively fixedly connected with the two power connection holes 26; electronic component board 2 still is equipped with two switch connecting holes 25, and two switch connecting holes 25 are connected with switch module 5's first output K1 and second output K2 respectively, two switch binding post 15 be connected with two switch connecting holes 25 respectively, switch connecting hole 25 is located power connecting hole 26's top, switch binding post 15 and power binding post 16's wiring board 13 becomes straight plate structure respectively, and switch connecting hole 25 is located the same height with switch binding post 15's wiring board 13 that corresponds, and power binding post 26 is located the same height with power binding post 16's wiring board 13 that corresponds, and switch binding post 15 and power binding post 16's wiring board 13 is pegged graft the cooperation with power connecting hole 26 and two switch connecting holes 25 respectively.

Through inciting somebody to action switch connecting hole 25 is located power connecting hole 26's top, two-layer multilayer wiring structure about not only can constituteing, the current domestic contactor of perfect adaptation reduces the degree of difficulty of wiring, and switch connecting hole 25 and power connecting hole 26 are located the same height with the wiring board 13 that corresponds separately moreover, just can the lug connection on electronic component board 2 through straight board structure wiring board 13, have characteristics small and with low costs. Two switch binding post 15's the same, two power binding post 16's the same structure, but the direction of lug 14 on the wiring board 13 probably needs the adjustment, as fig. 2 shows be the switch binding post 15 in the upper left corner of fig. 1, fig. 1 upper right corner also is equipped with switch binding post 15, be equipped with two on the casing 1 and be used for fixing respectively switch binding post 15's switch wiring groove 150, fig. 3 shows be the power binding post 16 in the lower right corner of fig. 1, fig. 1 lower left corner also is equipped with power binding post 16, be equipped with two power binding grooves 160 that are used for fixed power binding post 16 respectively on the casing 1.

Further, switch module 5 sets up the one side at electronic component board 2, wireless communication module 4 and power module 6 set up one side that switch module 5 was kept away from to electronic component board 2, just wireless communication module 4 sets up the top at power module 6, through such layout design, not only can guarantee that switch module 5, wireless communication module 4 and power module 6 are reliably integrated on an electronic component board 2, but also can guarantee reliable multilayer wiring structure, have compact structure and small characteristics.

As shown in fig. 6 to 7, the power module 6 includes a first voltage conversion circuit and a second voltage conversion circuit, and the first voltage conversion circuit and the second voltage conversion circuit convert the power module 6 into different voltages and respectively supply power to the switch module 5 and the wireless communication module 4. In this embodiment, the first voltage conversion circuit is a 12V conversion circuit, the second voltage conversion circuit is a 3.3V conversion circuit, the power module 6 includes a 12V conversion circuit shown in fig. 6 and a 3.3V conversion circuit shown in fig. 7, the power module 6 converts a household 220V power supply into two voltages of 3.3V and 12V, respectively, the wireless communication module 4 is supplied with the 3.3V voltage, and the switch module 5 is supplied with the 12V voltage.

As shown in fig. 6, the first voltage conversion circuit includes a voltage dependent resistor VR1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, an inductor L1, a fast recovery diode D1, a fast recovery diode D2, a rectifier bridge BR1, and a buck chip U1;

the voltage dependent resistor VR1 is connected in parallel between a live wire and a neutral wire of a household 220V power supply, the neutral wire of the household 220V power supply is connected with a first input end of a rectifier bridge BR1, the live wire of the household 220V power supply is connected with a second input end of the rectifier bridge VR1 through a resistor R1, the capacitor C1 and the resistor R2 are connected in parallel between two output ends of the rectifier bridge BR1, a fourth output end of the rectifier bridge BR1 is connected with a fourth pin of a voltage reduction chip U1, a third output end of the rectifier bridge BR1 is grounded, a fifth pin, a sixth pin, a seventh pin and an eighth pin of the voltage reduction chip U1 are respectively connected with cathodes of a capacitor C2, an inductor L1 and a fast recovery diode D2, an anode of the fast recovery diode D2 is grounded, the other end of the capacitor C2 is connected with a resistor R3 and an anode of the fast recovery diode D1, a cathode of the fast recovery diode D96 1 is connected with the other end of the voltage reduction inductor L1, and the other end of the resistor R3 is respectively connected with a second pin of the U1 and a resistor R4, the other end of the resistor R4 is respectively connected to the fifth pin, the sixth pin, the seventh pin and the eighth pin of the capacitor C3 and the buck chip U1, the other end of the capacitor C3 is connected to the first pin of the buck chip U1, the cathode of the capacitor C4 is grounded, and the anode of the capacitor C4 is the 12V output potential of the first voltage conversion circuit.

As shown in fig. 7, the second voltage conversion circuit includes a resistor R5, a resistor R6, a resistor R7, a capacitor C5, a capacitor C6, a capacitor C7, an inductor L2, a diode D4, a buck chip U2, and a light emitting diode LED 1;

the capacitor C5 is connected in parallel to two ends of the capacitor C4, the positive electrode of the capacitor C4 is connected to the first pin of the buck chip U2, the second pin of the buck chip U2 is connected with the inductor L2 and the negative electrode of the diode D4 respectively, the third pin of the buck chip U2 is connected with the resistor R5 and the resistor R6 respectively, the node at which the other end of the resistor R5 is connected with the inductor L2 is the 3.3V output potential of the second voltage conversion circuit, the other end of the resistor R6, the positive electrode of the diode D4 and the fourth pin of the buck chip U2 are grounded respectively, and after the resistor R7 and the light emitting diode LED1 are connected in series, the capacitor C6 and the capacitor C7 are connected in parallel between the 3.3V output potential of the second voltage conversion circuit and the ground terminal respectively.

As shown in fig. 8, the wireless communication module 4 of this embodiment interacts signals with an upper computer in a WIFI manner, and controls the on/off of the switch module 5 according to the signals, so that the wireless communication module can be used for a time relay and a time control switch for internet of things application, and certainly can also be used as other network switches. It should be understood that the wireless communication module 4 may also adopt bluetooth, etc., all of which fall within the protection scope of the present invention.

Specifically, the wireless communication module 4 of this embodiment includes a WIFI communication chip, the model of the WIFI communication chip is ESP-12F, a first pin and a second pin of the WIFI communication chip are respectively connected to the 3.3V voltage of the power module 6 through a resistor R10 and a resistor R11, an eighth pin of the WIFI communication chip is respectively connected to the 3.3V voltage of the capacitor C8, the capacitor C9 and the power module 6, the other ends of the capacitor C8 and the capacitor C9 are grounded, a sixteenth pin of the WIFI communication chip is grounded through a resistor R9, a fifteenth pin of the WIFI communication chip is grounded, an eighteenth pin of the WIFI communication chip is connected to the negative electrode of the light emitting diode LED2, the positive electrode of the light emitting diode LED2 is connected to the 3.3V voltage of the power module 6 through a resistor R8, a twentieth pin of the WIFI communication chip is connected to the base of the triode Q1 through a resistor R14, the emitter of the triode Q35 1 is grounded, and the collector of the triode Q1 is connected to the switch module 5, the triode Q1 is used for controlling the power supply module 6 to supply power to the switch module 5, and the WIFI communication chip is switched on and off through the triode Q1 so as to control the on and off of the switch module 5; the second pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin, the seventeenth pin, the nineteenth pin, the twenty-first pin to the twenty-eighth pin of the WIFI communication chip are respectively suspended. Preferably, wireless communication module 4 is the paster chip, the WIFI communication chip is the paster chip, and the one end that the WIFI communication chip was equipped with the PCB antenna stretches electronic component board 2's top, the one end that the PCB antenna was kept away from to the WIFI communication chip is fixed on electronic component board 2, and it is unsettled through stretching the top that electronic component board 2 with the PCB antenna, can make chip transmission received signal ability stronger, and the interference killing feature is higher, and wireless communication module 4's top is close to casing 1's top, is equipped with the window usually at casing 1 top, more has the transmission and the acceptance that are favorable to the signal, and this embodiment is equipped with two windows (not shown in the figure) at casing 1 top.

As shown in fig. 9, the switch module 5 of this embodiment is a micro relay, the switch module 5 includes a moving contact and an electromagnetic coil for controlling the moving contact to operate, the moving contact is connected between a first output terminal K1 and a second output terminal K2 of the switch module 5, the first output terminal K1 and the second output terminal K2 are respectively connected to two switch connection holes 25 on the electronic circuit board, one end of the electromagnetic coil is connected to the 12V voltage of the power module 6, the other end of the electromagnetic coil is grounded through a triode Q1, the base of the triode Q1 is connected to the WIFI communication chip of the wireless communication module 4, and two ends of the electromagnetic coil are connected in parallel to a diode D3. Triode Q1 is by WIFI communication chip control, when triode Q1 switches off, power module 6's 12V voltage can't be for the solenoid power supply, and when triode Q1 switched on, power module 6 was the solenoid power supply, and solenoid attracts the moving contact action, switches on between first output K1 and the second output K2, and then switches on between two switch binding post 15.

The foregoing is a more detailed description of the invention, taken in conjunction with the accompanying preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the inventive concept, and all should be considered as falling within the protection scope of the invention.

Claims (10)

1. A communication switch, characterized by: casing (1) and electronic component board (2), power binding post (16) and switch binding post (15) of setting in casing (1), be equipped with wireless communication module (4), switch module (5) and power module (6) on electronic component board (2), power binding post (16) are connected with power module (6), and power module (6) do wireless communication module (4) and switch module (5) power supply, two switch binding post (15) are connected with switch module (5) respectively, wireless communication module (4) can control switch module (5) switch on and break off two switch binding post (15).

2. The communication switch of claim 1, wherein: the power supply connecting terminal (16) and the switch connecting terminal (15) are arranged on the electronic component board (2) at different heights.

3. The communication switch according to claim 1 or 2, wherein: the electronic component board (2) is provided with two power supply connecting holes (26) and two switch connecting holes (25), and the wiring boards (13) of the switch wiring terminals (15) and the power supply wiring terminals (16) are respectively in plug-in fit with the power supply connecting holes (26) and the two switch connecting holes (25).

4. The communication switch of claim 1, wherein: switch module (5) set up the one side at electronic component board (2), wireless communication module (4) and power module (6) set up the one side that switch module (5) were kept away from to electronic component board (2), just wireless communication module (4) set up the top at power module (6).

5. The communication switch of claim 1, wherein: the wireless communication module (4) comprises a WIFI communication chip.

6. The communication switch of claim 1, wherein: the switch module (5) is a micro relay.

7. The communication switch of claim 1, wherein: the power module (6) comprises a first voltage conversion circuit and a second voltage conversion circuit, the first voltage conversion circuit and the second voltage conversion circuit convert the power module (6) into different voltages and respectively supply power to the switch module (5) and the wireless communication module (4).

8. The communication switch of claim 5, wherein: the WIFI communication chip is a patch chip, one end of the WIFI communication chip, which is provided with the PCB antenna, extends to the top of the electronic component board (2), and one end of the WIFI communication chip, which is far away from the PCB antenna, is fixed on the electronic component board (2).

9. The communication switch of claim 6, wherein: the switch module (5) comprises a moving contact and an electromagnetic coil used for controlling the moving contact to act, the moving contact is connected between a first output end K1 and a second output end K2 of the switch module (5), the first output end K1 and the second output end K2 are respectively connected with two switch connecting holes (25) on an electronic circuit board, one end of the electromagnetic coil is connected with a power supply module (6), the other end of the electromagnetic coil is grounded through a triode Q1, a base of a triode Q1 is connected with the wireless communication module (4), and two ends of the electromagnetic coil are connected with a diode D3 in parallel.

10. The communication switch of claim 7, wherein: the first voltage conversion circuit comprises a voltage dependent resistor VR1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, an inductor L1, a diode D1, a diode D2, a rectifier bridge BR1 and a voltage reduction chip U1; the voltage dependent resistor VR1 is connected in parallel between a live wire and a zero wire of a power supply, the zero wire of the power supply is connected at a first input end of a rectifier bridge BR1, the live wire of the power supply is connected to a second input end of the rectifier bridge VR1 through a resistor R1, a capacitor C1 and a resistor R2 are connected in parallel between two output ends of a rectifier bridge BR1, a fourth output end of the rectifier bridge BR1 is connected to a fourth pin of a voltage reduction chip U1, a third output end of the rectifier bridge BR1 is grounded, a fifth pin, a sixth pin, a seventh pin and an eighth pin of the voltage reduction chip U1 are respectively connected with a capacitor C2, an inductor L1 and a cathode of a diode D2, an anode of the diode D2 is grounded, the other end of the capacitor C2 is connected to a resistor R3 and an anode of the diode D1, a cathode of the diode D1 is connected with the other end of an inductor L1, the other end of the resistor R3 is respectively connected to a second pin of the voltage reduction chip U1 and one end of the resistor R4, and the other end of the resistor R4 are respectively connected to a fifth pin of the capacitor C3 and a fifth pin of the voltage reduction chip U1, The other end of the capacitor C3 is connected to the first pin of the voltage reduction chip U1, the negative electrode of the capacitor C4 is grounded, and the positive electrode of the capacitor C4 is the output potential of the first voltage conversion circuit;

the second voltage conversion circuit comprises a resistor R5, a resistor R6, a resistor R7, a capacitor C5, a capacitor C6, a capacitor C7, an inductor L2, a diode D4, a voltage reduction chip U2 and a light-emitting diode LED 1; the capacitor C5 is connected in parallel to two ends of the capacitor C4, the positive electrode of the capacitor C4 is connected to the first pin of the buck chip U2, the second pin of the buck chip U2 is connected with the inductor L2 and the negative electrode of the diode D4 respectively, the third pin of the buck chip U2 is connected with the resistor R5 and the resistor R6 respectively, the node at which the other end of the resistor R5 is connected with the inductor L2 is the 3.3V output potential of the second voltage conversion circuit, the other end of the resistor R6, the positive electrode of the diode D4 and the fourth pin of the buck chip U2 are grounded respectively, and after the resistor R7 and the light emitting diode LED1 are connected in series, the capacitor C6 and the capacitor C7 are connected in parallel between the 3.3V output potential of the second voltage conversion circuit and the ground terminal respectively.

Images