WO2018176460A1

WO2018176460A1 - Device and method for adjusting brightness of indoor lighting

Info

Publication number: WO2018176460A1
Application number: PCT/CN2017/079278
Authority: WO
Inventors: 杜文静; 李慧慧; 王磊
Original assignee: 中国科学院深圳先进技术研究院
Priority date: 2017-04-01
Filing date: 2017-04-01
Publication date: 2018-10-04

Abstract

A device for adjusting the brightness of indoor lighting, comprising: a light signal collection unit (1), which is used to collect external light intensity and output the same in the form of an electric signal; a button unit (2), which is used to key in control instructions; a light control unit (3) connected between a lamp power supply and a lamp, the light control unit (3) being used to access a pulse width modulation (PWM) drive signal and control the magnitude of a current transmitted from the lamp power supply to the lamp according to the PWM drive signal; a main control unit (4), the light signal collection unit (1), the button unit (2), and the light control unit (3) being electrically connected to the main control unit (4) respectively, and the main control unit (4) being used to receive the electric signal outputted by the light signal collection unit (1), and when the external light intensity is lower than a preset value, output a PWM drive signal to the light control unit (3), as well as receive a control instruction inputted by the button unit (2), and adjust the duty cycle of the PWM drive signal according to the control instruction, such that the input current for the lamp is adjusted accordingly. The described device for adjusting the brightness of indoor lighting has advantageous effects, such as saving energy and protecting vision.

Description

Indoor light brightness adjusting device and method

Technical field

The invention relates to a lighting control device, in particular to an indoor lighting brightness adjusting device and method.

Background technique

Energy and health are among the hot topics of contemporary society, and energy conservation is imminent. Looking around us, energy waste is very serious. In order to "energy saving and emission reduction", the Chinese government has developed a large amount of new energy sources such as wind, water, nuclear and solar energy in order to achieve energy conservation and emission reduction. However, the government has even used administrative orders to achieve energy conservation and emission reduction, but it has little effect. There is an upward trend. In the winter and summer peaks, most of China's electricity shortages, if this power shortage phenomenon occurs frequently, directly affecting the production and survival of Chinese enterprises, it will balance the sustainable development of China's national economy. As an inorganic energy source, it cannot be stored but must be used rationally. China's energy utilization efficiency is about 36.3%, which is 10% lower than that of developed countries. The gap between product consumption and international advanced level is large, and waste is staggering. In today's energy crisis and global warming, green energy conservation has reached a global consensus. In life, we will find that the waste of electricity is quite serious. For example, we often forget to turn off the lights because of the darkness of the rain or the light of the cloudy sky. On the one hand, it is a waste of electricity, on the other hand, when the outside light becomes strong. Strong lighting also has an impact on our vision.

In the prior art, the patent number: 201510401157.X solves the phenomenon that the power is not turned off by the corridor or the indoor lighting power supply, and a stable and reliable light adjusting device is proposed, which solves the problem that the light can be based on the external light intensity. The function of adjusting the brightness of the light also realizes the kinetic energy of automatically turning off the power of the light when no one is used, saving the power and eliminating the trouble of turning off the power, but the system The light energy that the human eye can bear is not explored. When the light is strong or weak, it will cause certain damage to human vision. Therefore, maintaining a constant light intensity in the room helps protect the human eyesight. Secondly, when the external light intensity makes the indoor light intensity higher than the constant light intensity, the system measures to reduce the brightness of the light bulb when the indoor light intensity is lower than the constant light. When strong, the system adjusts the light intensity to a constant level. This adjustment is made with the constant light intensity value set by the user, which has a certain protective effect on the human eye.

Summary of the invention

The technical problem to be solved by the present invention is that, in view of the deficiencies of the prior art, an indoor light brightness adjusting device and method capable of flexibly adjusting the brightness of the light according to the intensity of the external light and allowing the user to self-set the indoor light intensity value are provided.

In order to solve the above technical problems, the present invention adopts the following technical solutions.

An indoor light brightness adjusting device comprises: an optical signal collecting unit for collecting external light intensity and outputting in the form of an electric signal; a button unit for inputting a control command; and a light control unit connected to the lamp power supply The light control unit is configured to access the PWM driving signal and control the current of the current transmitted by the lamp power source to the lamp according to the PWM driving signal; a main control unit, the optical signal collecting unit, the button unit, and The light control unit is electrically connected to the main control unit, and the main control unit is configured to: receive an electrical signal output by the optical signal acquisition unit, and when the ambient light intensity is lower than a preset value, to the light control unit And outputting a PWM driving signal; and receiving a control command input by the button unit, and adjusting a duty ratio of the PWM driving signal according to the control command, so that an input current of the lamp is adjusted accordingly.

Preferably, the main control unit is pre-stored with a plurality of duty ratios, and the control instruction entered by the button unit includes a plurality of key values, and the key values are in one-to-one correspondence with the duty ratio, when the master control Unit received button When the key value of the key unit is entered, the duty ratio matching the key value is first queried, and then the PWM drive signal is generated according to the duty ratio and transmitted to the lamp control unit.

Preferably, a display unit is further included, and the display unit is electrically connected to the main control unit, and the display unit is configured to display the key value.

Preferably, a power conversion unit is further included, and the power conversion unit is configured to provide a DC supply voltage.

Preferably, the communication interface is further connected between the main control unit and the upper computer, and the communication device establishes communication between the upper computer and the main control unit.

Preferably, the optical signal collecting unit comprises a photoresistor and an analog-to-digital conversion chip, the photoresistor is connected to an analog signal end of the analog-to-digital conversion chip, and the digital signal end of the analog-to-digital conversion chip is connected to the main control unit, The photoresistor is used to sense an external light intensity to generate an electrical signal, and the analog-to-digital conversion chip is used for analog-to-digital conversion of the electrical signal output by the photoresistor and transmitted to the main control unit.

Preferably, the photoresistor is connected in series with a high-precision potentiometer, and the two are connected in series and connected between the high potential and the ground, and the connection point of the photoresistor and the high-precision potentiometer is connected to the analog signal end of the analog-to-digital converter chip. .

Preferably, the lamp control unit comprises a rectifier bridge, an NPN tube, an optocoupler and a MOS tube, wherein the AC side of the rectifier bridge is used to connect the lamp power supply, and the DC side positive pole of the rectifier bridge is connected to one end of the lamp. The drain of the MOS transistor is connected to the other end of the lamp, the source of the MOS transistor is grounded, the base of the NPN tube is connected to the main control unit, and the collector of the NPN tube is used to access a high potential. The emitter of the NPN tube is grounded through the LED of the optocoupler, the first end of the optocoupler switch is used to access the optocoupler driving voltage, and the second end of the optocoupler switch is connected to the gate of the MOS transistor When the lamp control unit outputs a PWM driving signal to the base of the NPN tube, the optocoupler and the MOS transistor are driven to perform an on-off operation with the PWM driving signal to adjust the current flowing through the lamp.

A method for adjusting the brightness of an indoor light, the method is implemented based on a device, the device comprises an optical signal collecting unit, a button unit, a light control unit and a main control unit, wherein the light control unit is connected to the lamp power supply and the lamp The optical signal collecting unit, the button unit and the light control unit are respectively electrically connected to the main control unit, and the method includes the following steps: Step S1, the optical signal collecting unit collects external light intensity and takes an electrical signal form. Outputting; in step S2, the main control unit receives an electrical signal output by the optical signal collecting unit, and outputs a PWM driving signal to the lighting control unit when the ambient light intensity is lower than a preset value; The light control unit is connected to the PWM driving signal, and controls the magnitude of the current transmitted by the lamp power source to the lamp according to the PWM driving signal; in step S4, the control command is input by using the button unit; in step S5, the main control unit receives the button unit input. Control command, and adjust the duty ratio of the PWM driving signal according to the control command, so that the input current of the lamp is adjusted accordingly.

Preferably, the main control unit is pre-stored with a plurality of duty ratios, and the control command entered by the button unit includes a plurality of key values, and the key values are in one-to-one correspondence with the duty ratio, in step S5. When the main control unit receives the key value typed by the button unit, firstly query the duty ratio matching the key value, and then generate a PWM driving signal according to the duty ratio and transmit the signal to the lamp control unit.

In the indoor light brightness adjusting device disclosed by the invention, the optical signal collecting unit outputs an external light intensity and outputs an electrical signal to the main control unit, and when the external light intensity is lower than a preset value, the main control unit sends the light control unit to the light control unit. Outputting a PWM driving signal to the light control unit, the light control unit controls a current amount transmitted by the lamp power source to the lamp according to the PWM driving signal; when the user self-adjusts, the button unit is used to input a control command to the main control unit, the main The control unit adjusts the duty ratio of the PWM driving signal according to the control command to adjust the input current of the lamp. Based on the above device, the invention realizes flexible adjustment of the brightness of the light according to the intensity of the external light. In addition, the user can also set the light intensity to achieve a constant light intensity in the room, thereby avoiding the result of the artificial switch light. Do not And it achieves the effect of saving energy and protecting vision.

DRAWINGS

1 is a block diagram showing the composition of an indoor light level adjusting device of the present invention.

2 is a circuit schematic diagram of an optical signal acquisition unit.

Figure 3 is a schematic diagram of the circuit of the main control unit.

Figure 4 is a circuit schematic of the lamp control unit.

Figure 5 is a circuit schematic of the display unit.

Figure 6 is a circuit schematic of the communication interface.

7 is a circuit schematic diagram of a power conversion unit.

FIG. 8 is a flow chart of a method for adjusting brightness of an indoor light in a preferred embodiment of the present invention.

detailed description

The invention will now be described in greater detail with reference to the drawings and embodiments.

The invention discloses an indoor light brightness adjusting device. Please refer to FIG. 1 , which includes an optical signal collecting unit 1 , a button unit 2 , a light control unit 3 and a main control unit 4 , wherein:

The optical signal collecting unit 1 is configured to collect external light intensity and output in the form of an electrical signal;

The button unit 2 is used to input a control command;

The light control unit 3 is connected between the power source of the lamp and the lamp, and the lamp control unit 3 is configured to access the PWM driving signal, and control the current of the current transmitted by the lamp power source to the lamp according to the PWM driving signal;

The optical signal collecting unit 1, the button unit 2 and the light control unit 3 are electrically connected to the main control list Element 4, the main control unit 4 is used to:

Receiving an electrical signal output by the optical signal collecting unit 1, and outputting a PWM driving signal to the lighting control unit 3 when the ambient light intensity is lower than a preset value;

And receiving a control command input by the button unit 2, and adjusting a duty ratio of the PWM driving signal according to the control command, so that an input current of the lamp is adjusted accordingly.

In the indoor lighting brightness adjusting device, the optical signal collecting unit 1 outputs an external light intensity and outputs an electrical signal to the main control unit 4. When the external light intensity is lower than a preset value, the main control unit 4 sends the light control unit to the light control unit. 3 output PWM driving signal to the light control unit 3, the light control unit 3 controls the magnitude of the current transmitted by the lamp power source to the lamp according to the PWM driving signal; when the user self-adjusts, the key unit 2 is used to input the control to the main control unit 4 Instructing, the main control unit 4 adjusts the duty ratio of the PWM driving signal according to the control instruction, so that the input current of the luminaire is adjusted accordingly. Based on the above device, the invention realizes flexible adjustment of the brightness of the light according to the intensity of the external light. In addition, the user can also set the light intensity to achieve a constant light intensity in the room, thereby avoiding the result of the artificial switch light. It is inconvenient and achieves the effect of saving energy and protecting vision.

As a preferred manner, the present embodiment implements the selection of the duty ratio by using the look-up table. Specifically, the main control unit 4 pre-stores a plurality of duty ratios, and the control unit inputs the key unit 2 The method includes a plurality of key values, and the key values are in one-to-one correspondence with the duty ratio. When the main control unit 4 receives the key value typed by the button unit 2, first query a duty ratio matching the key value. Then, the PWM driving signal is generated according to the duty ratio and transmitted to the lamp control unit 3.

In this embodiment, referring to FIG. 3, the main control unit 4 includes a single-chip microcomputer of the type STC89C52 and its peripheral circuits. Among them, the STC89C52 is a low-power, high-performance CMOS 8-bit microcontroller produced by STC, with 8K in System programmable flash memory. The STC89C52 uses the classic MCS-51 core, but has made a lot of improvements to make the chip have the features that the traditional 51 microcontroller does not have. On a single chip, with a smart 8-bit CPU and in-system programmable Flash, the STC89C52 provides a highly flexible, ultra-efficient solution for many embedded control applications. Has the following standard functions: 8k bytes of Flash, 512 bytes of RAM, 32-bit I/O line, watchdog timer, built-in 4KB EEPROM, MAX810 reset circuit, 3 16-bit timer/counters, 4 external interrupts , a 7-vector 4-level interrupt structure (compatible with the traditional 51 5-vector 2-level interrupt structure), full-duplex serial port. In addition, the STC89C52 can be reduced to 0Hz static logic operation, and supports two software selectable power saving modes. In idle mode, the CPU stops working, allowing RAM, timer/counter, serial port, and interrupt to continue to work. In the power-down protection mode, the RAM contents are saved, the oscillator is frozen, and all operations of the microcontroller are stopped until the next interrupt or hardware reset. The maximum operating frequency is 35MHz, and 6T/12T is optional.

In the peripheral circuit of the single chip microcomputer, the reset circuit is a circuit for returning the circuit to the initial state, and the reset circuit is an indispensable part for ensuring stable and reliable operation of the single chip system circuit. When power is on, C1 is charged, and a voltage appears on the 10K resistor, so that the MCU resets; after a few milliseconds, C1 is fully charged, and the voltage and current on the resistor drop to 0, so that the MCU enters the working state; during operation, when the switch is pressed S1, C1 discharge, voltage appears on the resistor, and the microcontroller is reset. The crystal oscillator circuit mainly supplies the working signal pulse to the single chip microcomputer. This pulse is the working speed of the single chip microcomputer.

In this embodiment, a display unit 5 is further included. The display unit 5 is electrically connected to the main control unit 4, and the display unit 5 is configured to display the key value. Referring to FIG. 5, the embodiment adopts a digital tube display mode, and the digital tube is a display device frequently used in a single chip system. The connection to different digital tube circuits is also different. We choose the four-in-one digital tube, and the segment (a, b, c, d, e, f, g, dp) of the digital tube is controlled by the PO port. The I/O port resources of the MCU are limited. Therefore, we need to use the octal three-state non-inverting transparent latch included in the 74HC573 chip to drive the 8-bit digital tube.

In this embodiment, a power conversion unit 6 is further included, and the power conversion unit 6 is configured to provide a straight Current supply voltage. Referring to FIG. 7, the power conversion unit 6 is powered by a 220V, 50 Hz AC power source. In the circuit, a power supply circuit composed of a transformer, a bridge rectifier circuit, a filter circuit, and a voltage stabilization circuit is built, including 220V to 12V and 5V. Although the 220V power supply poses certain dangers, the advantage of this solution is that it does not have to worry about the normal operation of the system due to the drop in the power supply voltage. In order to obtain stable 12V and 5V voltage, two voltage regulator chips, LM7812 and LM7805, are used to stabilize the voltage. During the circuit debugging process, it is considered that the electric shock will be accidentally touched, and the exposed part of the power supply is sealed with hot melt adhesive at one time.

On the basis of this, the embodiment also has a host computer communication function, specifically, the device further includes a communication interface 7, the communication interface 7 is electrically connected between the main control unit 4 and the upper computer, The communication interface 7 is used to establish communication between the host computer and the main control unit 4. Referring to FIG. 6, the data transmission interface is the hardware foundation of data transmission, and is also an important component of data communication and computer network. The data transmission interface of the MCU itself is mainly 8-bit or 16-bit parallel data interface and full-duplex serial communication interface. However, as many new data transmission interface standards continue to emerge, it is necessary to expand the data transmission interface of the MCU. MAX232 is a charge pump chip, which has the advantages of low power consumption, single power supply, low price, etc. It can be used as a serial interface circuit that conforms to the 232 standard between the single-chip microcomputer and the single-chip microcomputer, and between the single-chip microcomputer and the PC serial port.

As a preferred manner, referring to FIG. 2, the optical signal acquisition unit 1 includes a photoresistor D1 and an analog-to-digital conversion chip U2. The photoresistor D1 is connected to an analog signal terminal of the analog-to-digital conversion chip U2. The digital signal end of the chip U2 is connected to the main control unit 4, the photoresistor D1 is used to sense an external light intensity to generate an electrical signal, and the analog-to-digital conversion chip U2 is used for analog-to-digital conversion of the electrical signal outputted by the photoresistor D1. After transmission to the main control unit 4. Among them, the photoresistor is also called light pipe. The commonly used materials are cadmium sulfide, and there are also materials such as selenium, aluminum sulfide, lead sulfide and barium sulfide. These materials have the property of rapidly decreasing the resistance under the irradiation of light of a specific wavelength. this is Since the carriers generated by the light are all involved in the conduction, the drifting motion is performed under the action of the applied electric field, the electrons rush to the positive pole of the power source, and the holes rush to the negative pole of the power source, so that the resistance value of the photoresistor is rapidly decreased. At this time, the change of the voltage value at the input end of the ADC0804 is affected to obtain the current light intensity.

In order to further improve the accuracy of the signal acquisition, the photoresistor D1 is connected in series with a high-precision potentiometer R2, which is connected in series and connected between the high potential and the ground, and the connection point and mode of the photoresistor D1 and the high-precision potentiometer R2. The analog signal terminals of the digital conversion chip U2 are connected.

Referring to FIG. 4, the lamp control unit 3 includes a rectifier bridge UB1, an NPN transistor Q2, an optical coupling U3, and a MOS transistor Q1. The AC side of the rectifier bridge UB1 is used to connect the lamp power supply. The DC side positive pole of the rectifier bridge UB1 is connected to one end of the lamp, the drain of the MOS transistor Q1 is connected to the other end of the lamp, the source of the MOS transistor Q1 is grounded, and the base of the NPN tube Q2 is connected to the main control. The unit 4, the collector of the NPN tube Q2 is used to access a high potential, the emitter of the NPN tube Q2 is grounded through the light-emitting tube of the optocoupler U3, and the first end of the optocoupler U3 switch tube is used for accessing An optocoupler driving voltage, the second end of the optocoupler U3 switch is connected to the gate of the MOS transistor Q1, and when the lamp control unit 3 outputs a PWM driving signal to the base of the NPN tube Q2, the optocoupler is driven U3 and MOS transistor Q1 turn on and off with the PWM drive signal to regulate the current flowing through the lamp. The lamp of the invention relates to a 220V, 60W incandescent lamp. Considering that the 220V, 50HZ AC control bulb changes the brightness when the bulb is more obvious, it is converted to 220V, 100HZ DC through the rectifier bridge. The single-chip microcomputer generates the PWM wave with different duty ratio according to the illumination value to control the PS521-1. The optocoupler selected in this embodiment is a linear optocoupler, which can easily control the change of the output current according to the PWM of different duty cycles, The output current of the IO port of the single-chip microcomputer is very weak. The 220V voltage cannot be directly controlled by the optocoupler. Therefore, the high-voltage MOS transistor 2SK3878 is connected to the high-level ratio of the square wave to control the light-dark change value of the bulb.

On the basis of the above device, the invention also discloses a method for adjusting the brightness of the indoor light, combined As shown in FIG. 1 and FIG. 8 , the method is implemented based on a device. The device includes an optical signal collecting unit 1 , a button unit 2 , a light control unit 3 , and a main control unit 4 . The light control unit 3 is connected. The optical signal collecting unit 1, the button unit 2 and the light control unit 3 are electrically connected to the main control unit 4, respectively, and the method includes the following steps:

Step S1, the optical signal collecting unit 1 collects external light intensity and outputs it as an electrical signal;

In step S2, the main control unit 4 receives the electrical signal output by the optical signal collecting unit 1, and outputs a PWM driving signal to the lighting control unit 3 when the ambient light intensity is lower than a preset value;

Step S3, the lamp control unit 3 accesses the PWM driving signal, and controls the current of the current transmitted by the lamp power source to the lamp according to the PWM driving signal;

Step S4, using the button unit 2 to input a control instruction;

In step S5, the main control unit 4 receives the control command input by the button unit 2, and adjusts the duty ratio of the PWM driving signal according to the control command, so that the input current of the lamp is adjusted accordingly.

Regarding the selection and determination steps of the duty ratio, the main control unit 4 pre-stores a plurality of duty ratios, and the control command entered by the button unit 2 includes a plurality of key values, the key values and the duty ratio One-to-one correspondence, in the step S5, when the main control unit 4 receives the key value typed by the button unit 2, first queries the duty ratio matching the key value, and then generates a PWM drive according to the duty ratio. The signal is transmitted to the light control unit 3.

In the indoor light brightness adjusting device and method disclosed by the invention, the brightness of the light can be flexibly adjusted according to the intensity of the external light to achieve the effect of saving energy and protecting vision. The user can achieve a constant light intensity through the light intensity set by himself, which not only avoids the inconvenience of manually switching lights, but also saves energy and protects vision. Compared with the prior art, the present invention is a portable light brightness adjusting device, and the materials used are relatively low in the case of satisfying high performance; secondly, portable lighting The brightness adjusting device can be set by the user to suit the brightness intensity value of the eye, and the system can flexibly adjust the light intensity to a constant value by detecting the light intensity value in the environment; in addition, the present invention adjusts the light intensity to the human eye. The light intensity not only protects vision, but also saves energy.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. All modifications, equivalents, and improvements made within the technical scope of the present invention are intended to be included within the scope of the present invention.

Claims

An indoor light brightness adjusting device, comprising:

An optical signal collecting unit (1) is configured to collect external light intensity and output in the form of an electrical signal;

a button unit (2) for inputting a control command;

a light control unit (3) is connected between the lamp power supply and the lamp, the lamp control unit (3) is configured to access the PWM drive signal, and control the current transmitted by the lamp power source to the lamp according to the PWM drive signal;

a main control unit (4), the optical signal acquisition unit (1), the button unit (2) and the lamp control unit (3) are electrically connected to the main control unit (4), respectively, the main control unit (4) Used for:

Receiving an electrical signal output by the optical signal collecting unit (1), and outputting a PWM driving signal to the lighting control unit (3) when the ambient light intensity is lower than a preset value;

And receiving a control command input by the button unit (2), and adjusting a duty ratio of the PWM driving signal according to the control command, so that an input current of the lamp is adjusted accordingly.
The indoor light brightness adjusting device according to claim 1, wherein the main control unit (4) pre-stores a plurality of duty ratios, and the control unit of the button unit (2) inputs a plurality of key values. The key value is in one-to-one correspondence with the duty ratio. When the main control unit (4) receives the key value typed by the button unit (2), first query the duty ratio matching the key value. The PWM drive signal is generated according to the duty ratio and transmitted to the lamp control unit (3).
The indoor light brightness adjusting device according to claim 1, further comprising a display unit (5), the display unit (5) being electrically connected to the main control unit (4), the display unit (5) ) for displaying the key value.
The indoor light brightness adjusting device according to claim 1, further comprising a power A source conversion unit (6) for providing a DC supply voltage.
The indoor light brightness adjusting device according to claim 1, further comprising a communication interface (7), wherein the communication interface (7) is electrically connected between the main control unit (4) and the upper computer, The host computer establishes communication with the main control unit (4) by the communication interface (7).
The indoor light brightness adjusting device according to claim 1, wherein the optical signal collecting unit (1) comprises a photoresistor (D1) and an analog-to-digital conversion chip (U2), and the photoresistor (D1) is connected. On the analog signal end of the analog-to-digital conversion chip (U2), the digital signal end of the analog-to-digital conversion chip (U2) is connected to the main control unit (4), and the photoresistor (D1) is used to sense external light intensity. The electrical signal, the analog-to-digital conversion chip (U2) is used for analog-to-digital conversion of the electrical signal output from the photoresistor (D1) and transmitted to the main control unit (4).
The indoor light brightness adjusting device according to claim 6, wherein the photosensitive resistor (D1) is connected in series with a high-precision potentiometer (R2), and the two are connected in series and connected between a high potential and a ground. The connection point between the resistor (D1) and the high-precision potentiometer (R2) is connected to the analog signal terminal of the analog-to-digital converter chip (U2).
The indoor light brightness adjusting device according to claim 1, wherein the light control unit (3) comprises a rectifier bridge (UB1), an NPN tube (Q2), an optocoupler (U3), and a MOS tube (Q1). The AC side of the rectifier bridge (UB1) is used to connect the lamp power supply, the DC side positive pole of the rectifier bridge (UB1) is connected to one end of the lamp, and the drain of the MOS pipe (Q1) is connected to the other end of the lamp. The source of the MOS transistor (Q1) is grounded, the base of the NPN transistor (Q2) is connected to the main control unit (4), and the collector of the NPN tube (Q2) is used to access a high potential. The emitter of the NPN tube (Q2) is grounded through an arc tube of an optocoupler (U3), and the first end of the optocoupler (U3) switch tube is used to access an optocoupler drive voltage, the optocoupler (U3) switch The second end of the tube is connected to the gate of the MOS transistor (Q1), and when the lamp control unit (3) outputs a PWM driving signal to the base of the NPN tube (Q2), the light is driven The coupling (U3) and the MOS transistor (Q1) are turned on and off with the PWM drive signal to regulate the current flowing through the lamp.
A method for adjusting brightness of an indoor light, characterized in that the method is implemented based on a device comprising an optical signal collecting unit (1), a button unit (2), a light control unit (3) and a main control The unit (4), the lamp control unit (3) is connected between the lamp power supply and the lamp, and the optical signal acquisition unit (1), the button unit (2) and the lamp control unit (3) are electrically connected to the main unit respectively. Control unit (4), the method comprising the following steps:

Step S1, the optical signal collecting unit (1) collects external light intensity and outputs it as an electrical signal;

Step S2, the main control unit (4) receives the electrical signal output by the optical signal acquisition unit (1), and outputs a PWM drive to the light control unit (3) when the ambient light intensity is lower than a preset value. signal;

Step S3, the lamp control unit (3) accesses the PWM driving signal, and controls the current amount transmitted by the lamp power source to the lamp according to the PWM driving signal;

Step S4, using a button unit (2) to input a control command;

Step S5, the main control unit (4) receives the control command input by the button unit (2), and adjusts the duty ratio of the PWM driving signal according to the control command, so that the input current of the lamp is adjusted accordingly .
The indoor light brightness adjusting method according to claim 9, wherein the main control unit (4) pre-stores a plurality of duty ratios, and the control command entered by the button unit (2) includes a plurality of key values. The key value is in one-to-one correspondence with the duty ratio. In the step S5, when the main control unit (4) receives the key value typed by the button unit (2), the first query is related to the key value. The matched duty cycle is then generated according to the duty cycle and transmitted to the lamp control unit (3).