LED lighting and control method for reducing wasted power

Abstract

An electronic device comprises a bridge circuit configured to be connected to an external source and to rectify at least a portion of the external AC power source, an illuminance sensor, a control circuit connected to the illuminance sensor, one or more LEDs whose brightness is controlled by the control circuit, a converter configured to supply DC power to the control circuit from the AC power source rectified by the bridge circuit, and a power supply circuit comprising an optical coupler for controlling the converter based on optical coupling, wherein the control circuit may be configured to control the optical coupler of the power supply circuit to turn off the one or more LEDs and stop power supply from the bridge circuit to the converter based on identifying the brightness around the electronic device using the illuminance sensor and identifying that the brightness around the electronic device is below a reference brightness.

Description

Technology Field

[0001] With the advent of LED lighting, power consumption could be significantly reduced compared to incandescent or fluorescent lights of the past.

[0002] When LED lights are used as streetlights or lighting in offices, the LED lights are dimmed or turned off according to the illuminance to further reduce energy consumption.

[0003] However, even when dimming LED lights are turned off, power continues to be supplied to the converter or control circuit, consuming electricity.

[0004] The present invention relates to a technology that minimizes energy consumption by making wasted power zero through the automatic cutting off of power supplied to the converter or control circuit without switching off the power consumed by the converter or control circuit in the above state.

[0005] By reducing power consumption in this way, we can prevent environmental pollution caused by carbon emitted from wasted electricity and the causes of global warming, thereby enabling the realization of carbon neutrality. Background Technology

[0007] In office lights, since a single light switch controls multiple lights as a group, individual lights cannot be turned off unless the light switch is turned off.

[0008] To reduce energy consumption, a method is being used to further reduce power consumption by automatically varying the brightness of LED lights according to the ambient light level.

[0009] This method reduces energy by varying the current flowing through the LED lights according to ambient brightness. However, even when the surroundings become very bright enough to warrant turning off the lights, the lights cannot be extinguished unless the switch is turned 'off,' resulting in continuous and unnecessary power waste from the LED lights.

[0010] In this way, unnecessary power consumption is being reduced, resulting in carbon emissions.

[0011] In addition, this relates to a technology that detects a rapid change in ambient illuminance while the lights are off and immediately turns on the LED lights.

[0012] In addition, in the case of streetlights that use a single light sensor to turn them on and off, problems arise where the sensor malfunctions because tree leaves or other debris obstruct it, or contamination prevents it from reading the correct sensor value. The problem to be solved

[0014] Therefore, the objective of the present invention is to solve the above-mentioned problems in dimmable LED lighting or streetlights.

[0015] A control circuit is configured to automatically adjust the power supply to an LED light fixture according to the ambient light level by equipping an LED light fixture installed near an office window with an ambient light sensor that detects the ambient light level, and a means is provided to automatically cut off the power to the LED light fixture when the conditions for turning it off are met, and to automatically supply power when the conditions for turning it on are met again from the off state.

[0016] In addition, a means for detecting rapid changes in illumination is provided so that the surroundings can be detected when the light is off and the light can be turned on immediately.

[0017] In addition, in the case of streetlights, multiple light sensors are provided to prevent malfunctions caused by contamination of surrounding tree leaves or the light sensors. These sensors compare the values ​​to determine the correct value and prevent malfunctions. means of solving the problem

[0019] To achieve the above objective, according to an exemplary aspect of the present invention, a power supply / cutoff unit that cuts off power to a converter or control circuit when a condition for turning off an LED light is satisfied and supplies power when a condition for turning on is satisfied, and

[0020] Power supply 1, which supplies power only to the illuminance sensor and the control unit when the above-mentioned extinguishing condition is satisfied and the power supply is cut off, and a control unit configured to receive illuminance data from a sensor unit consisting of one illuminance sensor or one or more illuminance sensors that detect ambient illuminance, and to analyze, judge, and control the data to prevent malfunction.

[0021] In addition, it is equipped with a rapid change illuminance detection unit that detects when the surroundings become rapidly dark while the lights are off, so that the LED lighting is configured to turn on immediately when a rapid change in illuminance is detected.

[0022] In addition, to prevent malfunctions caused by defects in the light sensor or changes in the surrounding environment or contamination, a means is configured to control based on multiple values ​​by using multiple light sensors to read and compare values.

[0023] An electronic device is described. The electronic device may include a bridge circuit connected to an external source and configured to rectify at least a portion of the external AC power source, an illuminance sensor, a control circuit connected to the illuminance sensor, one or more LEDs whose brightness is controlled by the control circuit, a converter configured to supply DC power to the control circuit from the AC power source rectified by the bridge circuit, and a power supply circuit comprising an optical coupler for controlling the converter based on optical coupling. The control circuit may be configured to identify the brightness around the electronic device using the illuminance sensor. The control circuit may be configured to turn off the one or more LEDs based on identifying that the brightness around the electronic device is below a reference brightness. The control circuit may be configured to control the optical coupler of the power supply circuit to stop the power supply from the bridge circuit to the converter based on identifying that the brightness around the electronic device is below a reference brightness.

[0024] A method is described. The method may be performed in an electronic device having a power supply circuit comprising: a bridge circuit connected to an external source and configured to rectify at least a portion of the external AC power source; an illuminance sensor; a control circuit connected to the illuminance sensor; one or more LEDs whose brightness is controlled by the control circuit; a converter configured to supply DC power to the control circuit from the AC power source rectified by the bridge circuit; and an optical coupler for controlling the converter based on optical coupling. The method may include an operation in which the control circuit identifies the brightness around the electronic device using the illuminance sensor. The method may include an operation of turning off the one or more LEDs based on identifying that the brightness around the electronic device is below a reference brightness. The method may include an operation of controlling the optical coupler of the power supply circuit to stop power supply from the bridge circuit to the converter based on identifying that the brightness around the electronic device is below a reference brightness.

[0025] A non-transient computer-readable storage medium is described. The non-transient computer-readable storage medium may store one or more programs. The one or more programs may include instructions that cause the control circuit to identify the brightness around the electronic device using the light sensor when executed by an electronic device having a power supply circuit comprising: a bridge circuit configured to be connected to the outside and rectify at least a portion of the external AC power; a light sensor; a control circuit connected to the light sensor; one or more LEDs whose brightness is controlled by the control circuit; a converter configured to supply DC power to the control circuit from the AC power rectified by the bridge circuit; and an optical coupler for controlling the converter based on optical coupling. The one or more programs may include instructions that cause the control circuit to turn off the one or more LEDs based on identifying that the brightness around the electronic device is below a reference brightness when executed by the electronic device. The above one or more programs may include instructions that cause the control circuit to control the optical coupler of the power supply circuit to stop power supply from the bridge circuit to the converter based on identifying that the brightness around the electronic device is below a reference brightness when executed by the electronic device. Effects of the invention

[0027] In LED lighting that uses dimming control based on illuminance sensing, such as LED streetlights and office lights, power is supplied to the converter even when the LED module is turned off, unnecessarily wasting electricity.

[0028] The present invention has the effect of reducing energy waste by cutting off the wasted power when the LED module of the AD lighting is turned off, and thereby reducing carbon emissions, which contributes to the realization of carbon neutrality.

[0029] In addition, in the case of streetlights, power is generally continuously supplied to them for control even when they are turned off in order to remotely turn them on and off, resulting in unnecessary power waste.

[0030] When the streetlight of the present invention is turned off, the power is cut off, which has the effect of reducing unnecessary power waste. Brief explanation of the drawing

[0032] The foregoing and other features, aspects, and advantages of the present invention will be better understood by reading the following detailed description with reference to the accompanying drawings. In this context, the same reference numerals in the drawings are intended to indicate the same or similar members or components throughout the drawings. FIG. 1 is a drawing illustrating an embodiment of an LED lighting configuration that blocks wasted power according to the present invention. FIG. 2 is a drawing illustrating an embodiment comprising an LED lighting fixture and a light switch that cuts off wasted power according to the present invention. FIG. 3 is a drawing illustrating an example of an external shape applied to a street light according to the present invention. FIG. 4 is a drawing illustrating an example of an external shape applied to an office, etc. according to the present invention. FIG. 5 is a drawing illustrating an embodiment installed in an office, etc., according to the present invention. FIG. 6 is a drawing illustrating the configuration of an embodiment of a detection unit configuration for detecting a rapid darkening of the surroundings according to the present invention. FIG. 7 is a drawing illustrating an embodiment of a power supply / cutoff unit configuration according to the control conditions of the present invention. FIG. 8 is a drawing illustrating an embodiment in which LED lighting fixtures are grouped into a single light switch according to the present invention. Specific details for implementing the invention

[0033] The following description, provided with reference to the attached drawings, is intended to aid in a comprehensive understanding of the exemplary embodiment(s) and equivalents of the present invention as defined by the claims. While such description includes various specific details that aid in understanding the present invention, these should be regarded as merely illustrative. Accordingly, a person skilled in the art will be well aware that various changes and modifications to the embodiments described herein can be made without departing from the scope and concept of the present invention.

[0034] In the descriptions below, even if any component or object is expressed in the singular form, it should be understood that it includes components or objects in the plural form as well, unless the context clearly indicates otherwise.

[0035] Terms such as “generally, approximately, essentially” as used in this disclosure are used to mean that, although any characteristic, parameter, or value(s) do not necessarily need to be provided with exact accuracy, some degree of tolerance, measurement tolerance, or slight variation known, for example, to those skilled in the art, may occur in an amount that does not exclude the effect of providing the same characteristic, parameter, or value(s).

[0036] However, in describing the configuration and operating principles of various embodiments of the present invention, detailed descriptions regarding certain known functions and component(s) may be omitted for convenience to maintain clarity and brevity of the present disclosure.

[0037] FIG. 1 is a drawing illustrating an embodiment of an LED lighting configuration that blocks wasted power according to the present invention.

[0038] FIG. 2 is a drawing illustrating an embodiment comprising an LED lighting fixture and a light switch that cuts off wasted power according to the present invention.

[0039] FIG. 6 is a drawing illustrating the configuration of an embodiment of a detection unit configuration for detecting a rapid darkening of the surroundings according to the present invention.

[0040] FIG. 7 is a drawing illustrating an exemplary embodiment of a power supply / cutoff unit configuration that supplies / cuts off power according to the control conditions of the present invention.

[0041] FIG. 8 is a drawing illustrating an embodiment in which LED lighting fixtures are grouped into a single light switch according to the present invention.

[0042] The configuration and operating principles are explained in detail based on the drawings.

[0044] First, the configuration of the LED lighting fixture (1) that cuts off wasted power is,

[0045] An LED module (30) configured to turn on and off the lighting according to the control of the control unit (10);

[0046] An illuminance sensor (60) configured with one or more sensors (possibly composed of resistors R1, 2, 3 and CDS Cd1, 2, 3) provided at a predetermined location capable of detecting illuminance around a light source;

[0047] A power supply / cutoff unit (50) that can be configured with a relay, a triac, or a FET to cut off unnecessary wasted power when the condition to turn off the LED module (30) from the light sensor is satisfied;

[0048] Power supply 1 (40) composed of diode D2 and a supercapacitor or secondary battery SC to supply minimum power only to the light sensor (60) and the control unit (10) for control when the power supply from the power supply / cutoff unit (50) is cut off;

[0049] A converter (20) that generates and supplies the power required for a lighting fixture when power is supplied;

[0050] A control unit (10) that receives illuminance information and related information such as the state of power supply 1 (40) from an illuminance sensor (60) input from a lighting fixture, and performs calculations, judgments, and controls;

[0051] A driving unit (70) that can be configured with an FET or transistor to drive the LED module (30) 'on' and 'off' according to the control of the control unit (10);

[0052] It consists of

[0053] As shown in FIGS. 2 and FIGS. 8, the lighting fixtures in the office are configured to be turned on and off by cutting off power supply to one or multiple lights in a group using a single light switch (300).

[0054] As shown in FIG. 6, a detector (80) is configured with resistors R6 and R7 and a comparator U1 to detect a rapid change in ambient light.

[0055] In addition, so that a malfunction of the light sensor (60) can be reported to the central control unit remotely.

[0056] A communication module (90) is configured.

[0057] Also, as shown in FIG. 7, the power supply / cutoff unit (50) is composed of a bridge diode BR, resistors R10, 12, R13, and R14, FET transistors Q5 and Q6, and a photocoupler PC1.

[0059] The operation of the present invention is described as follows

[0060] Dimming control

[0061] In order to reduce power consumption, the LED lighting is divided into several stages according to the illuminance value of the illuminance sensor (60), for example, if the illuminance sensor (60) value is in the Rd1-Rd2 range, the brightness is 1% - 30%, if it is in the Rd2-Rd3 range, it is 31% - 50%, if it is in the Rd3-Rd4 range, it is 51% - 99%, and if it is Rd4 or higher, it is 100%. In order to control the brightness, the control unit (10) receives the input value of the illuminance sensor (60) from S1, S2, and S3, and controls the gate of the driving unit (70) using a PWM modulation method for the output O1 according to the illuminance sensor value, thereby changing the current flowing through the LED module (30) to control the brightness by varying it from 0 to 100%.

[0062] In this way, when the surroundings are very bright, the lights are turned off and the input power is cut off, thereby reducing unnecessary power consumption.

[0063] If the light sensor (60) value is Rd1 or lower, the condition for turning the LED module (30) 'off' is met, the control unit (10) controls the output O1 to set the gate of the driving unit (70) to 'low', thereby turning the driving unit (70) 'off' and cutting off the current flowing to the LED module (30) to turn off the light.

[0064] At this time, power is continuously supplied to the converter (20) and the control unit (10), and power is continuously consumed.

[0065] As a control method of another embodiment of the above dimming control

[0066] The illuminance reading from the illuminance sensor (50) located in the light fixture and the illuminance value 90cm above the floor, which is the actual usable space, are different from each other.

[0067] This is a control method for performing dimming control to resolve their deviations.

[0068] The illuminance of a space is determined by calculating the brightness and quantity of lights during the lighting design.

[0069] Therefore, a step of turning the lighting fixture 100% 'on' and determining the value of the illuminance sensor (60) read at this time (let's call it Rd5) as the illuminance reference value to which the Rd5 value must be maintained;

[0070] A step of controlling the illuminance sensor (60) value to maintain the reference value Rd5 by dimming when it becomes brighter than the reference value Rd5;

[0071] A control method that controls the light sensor (60) to turn off the light when it is determined that the surroundings have a lot of natural light when the light sensor (60) inputs a light value brighter than the reference value Rd5 after reaching a state where the dimming control is 5% or less.

[0073] Power cutoff control

[0074] In the dimming control of the present invention, when the LED module (30) is turned 'off' when the illuminance sensor (60) value is Rd1 or less, power is continuously supplied to the converter (20) and the control unit (10) and power is continuously consumed.

[0075] In order to cut off power that is unnecessarily wasted in this way, the control unit (10) controls the output O2 to 'low' and applies it to the diode of the photocoupler PC1 of the power supply / cutoff unit (50) through the resistor R14.

[0076] At this time, the transistor of photocoupler PC1 is turned 'off', and voltage is applied to the gate of FET Q5 through resistor R13, so that FET Q5 is turned 'on' and the gate of FET Q6 becomes 'low', so that the current supplied through b and c of (20) is cut off, cutting off the power supply to the converter (20) and making the power consumption zero.

[0078] Charging control during power cutoff

[0079] In order to determine the state of the light sensor (60) and control it while the power supply is cut off, power is supplied from power source 1 (40) to the light sensor (60) and the control unit (10).

[0080] At this time, in order to further reduce the power consumption of power supply 1 (40), the control unit (10) enters sleep mode and periodically wakes up at a set time (e.g., if it is T1) and reads the VCC value of power supply 1 (40) from the analog-to-digital converter VCC1. When the charging required voltage (e.g., if it is VC) reaches VC, the control unit (10) controls the output O2 to 'high' for charging and applies it to the diode of the photocoupler PC1 of the power supply / cutoff unit (50) through the resistor R14.

[0081] At this time, the transistor of photocoupler PC1 is turned 'on', the voltage at the gate of FET Q5 becomes 'low', FET Q5 is turned 'off', the gate of FET Q6 becomes 'high', FET Q6 is turned 'on', and current flows to FET Q6 through b and c of converter (20), supplying power to converter (20) and power supply to power source 1 (40).

[0082] In this way, the converter (20) supplies VLED power to power 1 (40) to charge power 1 (40).

[0083] At this time, when the output voltage VCC of power supply 1 (40) is read by the VCC1 analog-to-digital converter AD and reaches the charging voltage (e.g., if it is VCCM), the control unit (10) outputs O2 as follows

[0084] Power cutoff control is performed to turn off the power supply / cutoff unit (50) to cut off the power supply, thereby cutting off wasted power and proceeding back to sleep mode.

[0086] LED module lighting control in off state

[0087] When the condition is met to periodically wake up from sleep mode and read the value of the light sensor (60) to light up the LED module (30), the control unit (10) controls output O2 and output O1 to turn on the power supply / cutoff unit (50) and controls the driving unit (70) to variably control the current value of the LED module (30) according to the lighting condition, thereby varying the brightness to light up.

[0089] LED module lighting control during rapid brightness changes from off state

[0090] When the LED light (1) is turned off (in sleep mode), the input power is cut off, so it cannot detect when the surroundings rapidly become dark due to changes in the environment, such as when it becomes dark due to heavy clouds.

[0091] A detector (8) configured to detect this state immediately compares the voltage of the inverter section of comparator U1, to which the value of the light sensor (60) is input, with the voltage of the non-inverter section of comparator U1 connected by resistors R5 and R7, so that when a sudden change occurs, the voltage of the inverter section becomes lower. When a low value occurs, the output INT of comparator U1 becomes 'high' and is transmitted to the interrupt INT of the control unit (10). Then, the control unit (10) wakes up from sleep mode, controls outputs O1 and O2 to supply power, and lights up the LED light (1).

[0093] Power cutoff control during group control

[0094] As shown in FIGS. 5 and 8, multiple lights such as LED lights A, B, and C are installed in the office, connected to a single switch (300) in FIG. 2. Therefore, power consumption is reduced through dimming at the windows with a lot of sunlight. However, when the condition for turning off the lights is met by reading the illuminance value from the illuminance sensor (60), power continues to be consumed and wasted in the converter (20) even when the LED module (30) is turned off.

[0095] To reduce this, power supply / cutoff unit (50) of the LED lighting (1) that is in a state of being turned off can be turned off by performing power cutoff control to completely cut off wasted power, thereby reducing unnecessarily wasted power.

[0097] Illumination sensor inspection, management, and control

[0098] LED lighting (1) installed outdoors, such as a street light, is configured with multiple light sensors (60) to prevent malfunction caused by the light sensor when the light sensor window (60) is contaminated with dust or dirt due to the environment. The sensor values ​​are read and compared, and if there is a light sensor (60) with a comparison judgment standard value JS (e.g., if there is a difference of 10% or more) with other multiple sensor values, it is determined that the sensor is contaminated with dust or impurities or is incorrect due to the influence of the surrounding environment, and the relevant information is transmitted to a central control unit through a communication module (90) so that it can be checked.

[0099] At this time, the control of the LED module (30) is determined to be normal values ​​by multiple sensor values ​​and is controlled according to these values.

[0101] The electronic device described above may include a bridge circuit configured to be connected to the outside and rectify at least a portion of the external AC power, an illuminance sensor, a control circuit connected to the illuminance sensor, one or more LEDs whose brightness is controlled by the control circuit, a converter configured to supply DC power to the control circuit from the AC power rectified by the bridge circuit, and a power supply circuit comprising an optical coupler for controlling the converter based on optical coupling. The control circuit may be configured to identify the brightness around the electronic device using the illuminance sensor. The control circuit may be configured to turn off the one or more LEDs based on identifying that the brightness around the electronic device is below a reference brightness. The control circuit may be configured to control the optical coupler of the power supply circuit to stop the power supply from the bridge circuit to the converter based on identifying that the brightness around the electronic device is below a reference brightness.

[0102] For example, the power supply circuit may further include a first transistor comprising a resistor having one end connected to the control circuit and the other end connected to one end of the optical coupler, a gate electrode connected to the other end of the optical coupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter. The control circuit may be configured to change the level of a signal applied to the one end of the optical coupler of the power supply circuit in order to change the states of the first transistor and the second transistor based on identifying, using the illuminance sensor, that the brightness around the electronic device is below the reference brightness. The converter may be configured to stop converting the AC power rectified by the bridge circuit into the DC power based on identifying a change in the state of the second transistor through the drain electrode of the second transistor.

[0103] For example, the control circuit may further include a transistor comprising a gate electrode connected to the control circuit, a source electrode connected to ground, and a drain electrode connected to one or more LEDs. The control circuit may be configured to disable the transistor by transmitting a signal to the gate electrode of the transistor to turn off the power of the one or more LEDs based on identifying, using the illuminance sensor, that the brightness around the electronic device is below the reference brightness.

[0104] For example, it may further include a diode having an anode connected to one end of the converter and a capacitor connected to the cathode of the diode. The capacitor may be configured to discharge to drive the control circuit and the illuminance sensor while the conversion of the AC power based on the converter is interrupted.

[0105] For example, the control circuit may be configured to detect the voltage of the capacitor. The control circuit may be configured to control the optocoupler of the power supply circuit for the power supply from the bridge circuit to the converter based on identifying that the detected voltage is less than a reference voltage.

[0106] For example, the power supply circuit may further include a first transistor comprising a resistor having one end connected to the control circuit and the other end connected to one end of the optical coupler, a gate electrode connected to the other end of the optical coupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter. The control circuit may be configured to change the level of a signal applied to the one end of the optical coupler of the power supply circuit in order to change the states of the first transistor and the second transistor based on identifying that the detected voltage is less than the reference voltage. The converter may be configured to convert the AC power rectified by the bridge circuit into the DC power based on identifying a change in the state of the second transistor through the drain electrode of the second transistor.

[0107] For example, the control circuit may be configured to identify the brightness around the electronic device using the illuminance sensor. The control circuit may be configured to turn on one or more LEDs based on identifying that the brightness around the electronic device exceeds the reference brightness.

[0108] For example, the device may further include a transistor comprising a gate electrode connected to the control circuit, a source electrode connected to ground, and a drain electrode connected to one or more LEDs. The control circuit may be configured to activate the transistor by transmitting a signal to the gate electrode of the transistor to turn on the power of the one or more LEDs based on identifying, using the illuminance sensor, that the brightness around the electronic device exceeds the reference brightness.

[0109] For example, the control circuit may be configured to control one or more turned-on LEDs to emit light according to a first brightness based on identifying that the brightness around the electronic device is greater than the reference brightness and less than another reference brightness. The other reference brightness may be greater than the reference brightness. The control circuit may be configured to control one or more turned-on LEDs to emit light according to a second brightness that is greater than the first brightness based on identifying that the brightness around the electronic device is greater than the other reference brightness.

[0110] For example, the control circuit may be configured to detect the voltage of the capacitor, which is charged by the DC power supplied from the converter while the AC power is converted into the DC power based on the converter. The control circuit may be configured to control the optocoupler of the power supply circuit to stop the power supply from the bridge circuit to the converter based on identifying that the detected voltage reaches another reference voltage higher than the reference voltage.

[0111] For example, the power supply circuit may further include a first transistor comprising a resistor having one end connected to the control circuit and the other end connected to one end of the optical coupler, a gate electrode connected to the other end of the optical coupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter. The control circuit may be configured to change the level of a signal applied to the one end of the optical coupler of the power supply circuit in order to change the states of the first transistor and the second transistor based on identifying that the detected voltage reaches the other reference voltage. The converter may be configured to stop converting the AC power rectified by the bridge circuit into the DC power based on identifying that the state of the second transistor changes through the drain electrode of the second transistor.

[0112] For example, the control circuit may be configured to be deactivated while the conversion of the AC power source based on the converter is interrupted. The control circuit may be configured to detect the voltage of the capacitor as it is activated based on a period.

[0113] For example, a voltage comparator may further include one end comprising a non-inverter end to which a reference voltage is applied and an inverter end connected to the illuminance sensor, and the other end connected to the control circuit. The control circuit may be configured to identify, through the other end of the comparator, that a voltage corresponding to the reference voltage is applied to the comparator from the illuminance sensor through the inverter end of the comparator. The control circuit may be configured to control the optocoupler of the power supply circuit for the power supply from the bridge circuit to the converter, based on identifying that a voltage corresponding to the reference voltage is applied to the comparator through the inverter end of the comparator.

[0114] For example, the control circuit may be configured to identify the brightness around the electronic device using the illuminance sensor. The control circuit may be configured to turn on one or more LEDs based on identifying that the brightness around the electronic device exceeds the reference brightness.

[0115] For example, the device may further include a transistor comprising a gate electrode connected to the control circuit, a source electrode connected to ground, and a drain electrode connected to one or more LEDs. The control circuit may be configured to activate the transistor by transmitting a signal to the gate electrode of the transistor to turn on the power of the one or more LEDs based on identifying, using the illuminance sensor, that the brightness around the electronic device exceeds the reference brightness.

[0116] For example, the control circuit may be configured to control one or more turned-on LEDs to emit light according to a first brightness based on identifying that the brightness around the electronic device is greater than the reference brightness and less than another reference brightness. The other reference brightness may be greater than the reference brightness. The control circuit may be configured to control one or more turned-on LEDs to emit light according to a second brightness that is greater than the first brightness based on identifying that the brightness around the electronic device is greater than the other reference brightness.

[0117] For example, a communication circuit connected to the control circuit may be further included. The illuminance sensor may be composed of a plurality of illuminance sensors. The control circuit may be configured to acquire values ​​regarding the brightness around the electronic device using each of the plurality of illuminance sensors. The control circuit may be configured to identify a value having an error outside a reference range among the values ​​by comparing the values ​​with each other. Based on identifying the value having an error outside the reference range among the values, the control circuit may be configured to transmit a signal to an external electronic device via the communication circuit to notify the illuminance sensor among the plurality of illuminance sensors that acquired the value.

[0118] The above-described method may be performed in an electronic device having a power supply circuit comprising: a bridge circuit connected to the outside and configured to rectify at least a portion of the external AC power source; an illuminance sensor; a control circuit connected to the illuminance sensor; one or more LEDs whose brightness is controlled by the control circuit; a converter configured to supply DC power to the control circuit from the AC power source rectified by the bridge circuit; and an optical coupler for controlling the converter based on optical coupling. The method may include an operation in which the control circuit identifies the brightness around the electronic device using the illuminance sensor. The method may include an operation of turning off the one or more LEDs based on identifying that the brightness around the electronic device is below a reference brightness. The method may include an operation of controlling the optical coupler of the power supply circuit to stop the power supply from the bridge circuit to the converter based on identifying that the brightness around the electronic device is below a reference brightness.

[0119] For example, the power supply circuit may further include a first transistor comprising a resistor having one end connected to the control circuit and the other end connected to one end of the optical coupler, a gate electrode connected to the other end of the optical coupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter. The method may include an operation in which the control circuit changes the level of a signal applied to the one end of the optical coupler of the power supply circuit to change the states of the first transistor and the second transistor based on the control circuit identifying, using the illuminance sensor, that the brightness around the electronic device is less than the reference brightness. The method may include an operation in which the converter stops converting the AC power rectified by the bridge circuit into the DC power based on the converter identifying a change in the state of the second transistor through the drain electrode of the second transistor.

[0120] For example, the electronic device may further include a transistor comprising a gate electrode connected to the control circuit, a source electrode connected to ground, and a drain electrode connected to one or more LEDs. The method may include the operation of deactivating the transistor by transmitting a signal to the gate electrode of the transistor to turn off the power of the one or more LEDs based on the control circuit identifying that the brightness around the electronic device is less than the reference brightness using the illuminance sensor.

[0121] For example, the electronic device may further include a diode having an anode connected to one end of the converter and a capacitor connected to the cathode of the diode. The method may include an operation in which the capacitor is discharged to drive the control circuit and the illuminance sensor while the conversion of the AC power source based on the converter is interrupted.

[0122] For example, the above method may include an operation in which the control circuit detects the voltage of the capacitor. The above method may include an operation in which the control circuit controls the optocoupler of the power supply circuit for power supply from the bridge circuit to the converter based on identifying that the detected voltage is less than a reference voltage.

[0123] For example, the power supply circuit may further include a first transistor comprising a resistor having one end connected to the control circuit and the other end connected to one end of the optical coupler, a gate electrode connected to the other end of the optical coupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter. The method may include an operation in which the control circuit changes the level of a signal applied to the one end of the optical coupler of the power supply circuit to change the states of the first transistor and the second transistor based on identifying that the detected voltage is less than the reference voltage. The method may include an operation in which the converter converts the AC power rectified by the bridge circuit into the DC power based on identifying that the state of the second transistor is changed through the drain electrode of the second transistor.

[0124] For example, the above method may include an operation in which the control circuit identifies the brightness around the electronic device using the illuminance sensor. The above method may include an operation in which the control circuit turns on one or more LEDs based on identifying that the brightness around the electronic device exceeds the reference brightness.

[0125] For example, the electronic device may further include a transistor comprising a gate electrode connected to the control circuit, a source electrode connected to ground, and a drain electrode connected to one or more LEDs. The method may include the operation of activating the transistor by transmitting a signal to the gate electrode of the transistor to turn on the power of the one or more LEDs based on the control circuit identifying, using the illuminance sensor, that the brightness around the electronic device exceeds the reference brightness.

[0126] For example, the above method may include an operation in which the control circuit controls one or more turned-on LEDs to emit light according to a first brightness, based on identifying that the brightness around the electronic device is greater than the reference brightness and less than another reference brightness. The other reference brightness may be greater than the reference brightness. The above method may include an operation in which the control circuit controls one or more turned-on LEDs to emit light according to a second brightness that is greater than the first brightness, based on identifying that the brightness around the electronic device is greater than the other reference brightness.

[0127] For example, the method may include an operation in which the control circuit detects the voltage of the capacitor, which is charged by the DC power received from the converter while the AC power is converted into the DC power based on the converter. The method may include an operation in which the control circuit controls the optocoupler of the power supply circuit to stop the power supply from the bridge circuit to the converter based on identifying that the detected voltage reaches another reference voltage higher than the reference voltage.

[0128] For example, the power supply circuit may further include a first transistor comprising a resistor having one end connected to the control circuit and the other end connected to one end of the optical coupler, a gate electrode connected to the other end of the optical coupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter. The method may include an operation in which the control circuit changes the level of a signal applied to the one end of the optical coupler of the power supply circuit to change the states of the first transistor and the second transistor based on identifying that the detected voltage reaches the other reference voltage. The method may include an operation in which the converter stops converting the AC power rectified by the bridge circuit into the DC power based on identifying that the state of the second transistor changes through the drain electrode of the second transistor.

[0129] For example, the above method may include an operation in which the control circuit is deactivated while the conversion of the AC power source based on the converter is interrupted. The above method may include an operation in which the control circuit detects the voltage of the capacitor as it is activated based on a period.

[0130] For example, the electronic device may further include a voltage comparator comprising one end including a non-inverter end to which a reference voltage is applied and an inverter end connected to the illuminance sensor, and the other end connected to the control circuit. The method may include an operation in which the control circuit identifies, through the other end of the comparator, that a voltage corresponding to the reference voltage is applied to the comparator from the illuminance sensor through the inverter end of the comparator. The method may include an operation in which the control circuit controls the optocoupler of the power supply circuit for power supply from the bridge circuit to the converter based on identifying that a voltage corresponding to the reference voltage is applied to the comparator through the inverter end of the comparator.

[0131] For example, the above method may include an operation in which the control circuit identifies the brightness around the electronic device using the illuminance sensor. The above method may include an operation in which the control circuit turns on one or more LEDs based on identifying that the brightness around the electronic device exceeds the reference brightness.

[0132] For example, the electronic device may further include a transistor comprising a gate electrode connected to the control circuit, a source electrode connected to ground, and a drain electrode connected to one or more LEDs. The method may include the operation of activating the transistor by transmitting a signal to the gate electrode of the transistor to turn on the power of the one or more LEDs based on the control circuit identifying, using the illuminance sensor, that the brightness around the electronic device exceeds the reference brightness.

[0133] For example, the above method may include an operation in which the control circuit controls one or more turned-on LEDs to emit light according to a first brightness, based on identifying that the brightness around the electronic device is greater than the reference brightness and less than another reference brightness. The other reference brightness may be greater than the reference brightness. The above method may include an operation in which the control circuit controls one or more turned-on LEDs to emit light according to a second brightness that is greater than the first brightness, based on identifying that the brightness around the electronic device is greater than the other reference brightness.

[0134] For example, the electronic device may further include a communication circuit connected to the control circuit. The illuminance sensor may be composed of a plurality of illuminance sensors. The method may include an operation in which the control circuit acquires values ​​regarding the brightness around the electronic device using each of the plurality of illuminance sensors. The method may include an operation in which the control circuit identifies a value having an error outside a reference range among the values ​​by comparing the values ​​with each other. The method may include an operation in which the control circuit, based on identifying the value having an error outside the reference range among the values, transmits a signal to an external electronic device via the communication circuit to notify the illuminance sensor among the plurality of illuminance sensors that acquired the value.

[0135] The above-described non-transient computer-readable storage medium may store one or more programs. The one or more programs may include instructions that cause the control circuit to identify the brightness around the electronic device using the light sensor when executed by an electronic device having a power supply circuit comprising: a bridge circuit configured to be connected to the outside and rectify at least a portion of the external AC power; a light sensor; a control circuit connected to the light sensor; one or more LEDs whose brightness is controlled by the control circuit; a converter configured to supply DC power to the control circuit from the AC power rectified by the bridge circuit; and an optical coupler for controlling the converter based on optical coupling. The one or more programs may include instructions that cause the control circuit to turn off the one or more LEDs based on identifying that the brightness around the electronic device is below a reference brightness when executed by the electronic device. The above one or more programs may include instructions that cause the control circuit to control the optical coupler of the power supply circuit to stop power supply from the bridge circuit to the converter based on identifying that the brightness around the electronic device is below a reference brightness when executed by the electronic device.

[0136] For example, the power supply circuit may further include a first transistor comprising a resistor having one end connected to the control circuit and the other end connected to one end of the optical coupler, a gate electrode connected to the other end of the optical coupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter. The one or more programs may include instructions that cause the control circuit to change the level of a signal applied to the one end of the optical coupler of the power supply circuit in order to change the states of the first transistor and the second transistor based on identifying, using the illuminance sensor, that the brightness around the electronic device is below the reference brightness when executed by the electronic device. The above one or more programs may include instructions that cause the converter to stop converting the AC power rectified by the bridge circuit into the DC power, based on identifying a change in the state of the second transistor through the drain electrode of the second transistor when executed by the electronic device.

[0137] For example, the electronic device may further include a transistor comprising a gate electrode connected to the control circuit, a source electrode connected to ground, and a drain electrode connected to one or more LEDs. The one or more programs may include instructions that cause the control circuit to disable the transistor by transmitting a signal to the gate electrode of the transistor to turn off the power of the one or more LEDs based on identifying, using the illuminance sensor, that the brightness around the electronic device is below the reference brightness when executed by the electronic device.

[0138] For example, the electronic device may further include a diode having an anode connected to one end of the converter and a capacitor connected to the cathode of the diode. The one or more programs may include instructions that cause the capacitor to discharge in order to drive the control circuit and the light sensor while the conversion of the AC power based on the converter is interrupted when executed by the electronic device.

[0139] For example, the one or more programs may include instructions that cause the control circuit to detect the voltage of the capacitor when executed by the electronic device. The one or more programs may include instructions that cause the control circuit to control the optocoupler of the power supply circuit for the power supply from the bridge circuit to the converter based on identifying that the detected voltage is less than a reference voltage when executed by the electronic device.

[0140] For example, the power supply circuit may further include a first transistor comprising a resistor having one end connected to the control circuit and the other end connected to one end of the optical coupler, a gate electrode connected to the other end of the optical coupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter. The one or more programs may include instructions that cause the control circuit to change the level of a signal applied to the one end of the optical coupler of the power supply circuit in order to change the states of the first transistor and the second transistor based on identifying that the detected voltage is less than the reference voltage when executed by the electronic device. The above one or more programs may include instructions that cause the converter to convert the AC power rectified by the bridge circuit into the DC power, based on identifying a change in the state of the second transistor through the drain electrode of the second transistor when executed by the electronic device.

[0141] For example, the one or more programs may include instructions that cause the control circuit to identify the brightness around the electronic device using the light sensor when executed by the electronic device. The one or more programs may include instructions that cause the control circuit to turn on the one or more LEDs based on identifying that the brightness around the electronic device exceeds the reference brightness when executed by the electronic device.

[0142] For example, the electronic device may further include a transistor comprising a gate electrode connected to the control circuit, a source electrode connected to ground, and a drain electrode connected to one or more LEDs. The one or more programs may include instructions that cause the control circuit to activate the transistor by transmitting a signal to the gate electrode of the transistor to turn on the power of the one or more LEDs, based on identifying that the brightness around the electronic device exceeds the reference brightness using the illuminance sensor when executed by the electronic device.

[0143] For example, the one or more programs may include instructions that cause the control circuit to control the one or more turned-on LEDs to emit light according to a first brightness, based on identifying that the brightness around the electronic device is greater than the reference brightness and less than another reference brightness when executed by the electronic device. The other reference brightness may be greater than the reference brightness. The one or more programs may include instructions that cause the control circuit to cause the one or more turned-on LEDs to emit light according to a second brightness that is greater than the first brightness, based on identifying that the brightness around the electronic device is greater than the other reference brightness when executed by the electronic device.

[0144] For example, the one or more programs may include instructions that cause the control circuit to detect the voltage of the capacitor, which is charged by the DC power received from the converter while the AC power is converted to the DC power based on the converter when executed by the electronic device. The one or more programs may include instructions that cause the control circuit to control the optocoupler of the power supply circuit to stop the power supply from the bridge circuit to the converter based on identifying that the detected voltage reaches another reference voltage higher than the reference voltage when executed by the electronic device.

[0145] For example, the power supply circuit may further include a first transistor comprising a resistor having one end connected to the control circuit and the other end connected to one end of the optical coupler, a gate electrode connected to the other end of the optical coupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter. The one or more programs may include instructions that cause the control circuit to change the level of a signal applied to the one end of the optical coupler of the power supply circuit in order to change the states of the first transistor and the second transistor based on identifying that the detected voltage reaches the other reference voltage when executed by the electronic device. The above one or more programs may include instructions that cause the converter to stop converting the AC power rectified by the bridge circuit into the DC power, based on identifying a change in the state of the second transistor through the drain electrode of the second transistor when executed by the electronic device.

[0146] For example, the one or more programs may include instructions that cause the control circuit to be disabled while the conversion of the AC power based on the converter is interrupted when executed by the electronic device. The one or more programs may include instructions that cause the control circuit to detect the voltage of the capacitor as it is activated based on a period when executed by the electronic device.

[0147] For example, the electronic device may further include a voltage comparator comprising one end including a non-inverter end to which a reference voltage is applied and an inverter end connected to the illuminance sensor, and the other end connected to the control circuit. The one or more programs may include instructions that cause the control circuit to identify, when executed by the electronic device, that a voltage corresponding to the reference voltage is applied to the comparator from the illuminance sensor through the inverter end of the comparator via the other end of the comparator. The one or more programs may include instructions that cause the control circuit to control the optocoupler of the power supply circuit for the power supply from the bridge circuit to the converter based on identifying that a voltage corresponding to the reference voltage is applied to the comparator through the inverter end of the comparator when executed by the electronic device.

[0148] For example, the one or more programs may include instructions that cause the control circuit to identify the brightness around the electronic device using the light sensor when executed by the electronic device. The one or more programs may include instructions that cause the control circuit to turn on the one or more LEDs based on identifying that the brightness around the electronic device exceeds the reference brightness when executed by the electronic device.

[0149] For example, the electronic device may further include a transistor comprising a gate electrode connected to the control circuit, a source electrode connected to ground, and a drain electrode connected to one or more LEDs. The one or more programs may include instructions that cause the control circuit to activate the transistor by transmitting a signal to the gate electrode of the transistor to turn on the power of the one or more LEDs, based on identifying, using the illuminance sensor, that the brightness around the electronic device exceeds the reference brightness when executed by the electronic device.

[0150] For example, the one or more programs may include instructions that cause the control circuit to cause the turned-on one or more LEDs to emit light according to a first brightness, based on identifying that the brightness around the electronic device is greater than the reference brightness and less than another reference brightness when executed by the electronic device. The other reference brightness may be greater than the reference brightness. The one or more programs may include instructions that cause the control circuit to cause the turned-on one or more LEDs to emit light according to a second brightness that is greater than the first brightness, based on identifying that the brightness around the electronic device is greater than the other reference brightness when executed by the electronic device.

[0151] For example, the electronic device may further include a communication circuit connected to the control circuit. The illuminance sensor may be composed of a plurality of illuminance sensors. The one or more programs may include instructions that trigger the control circuit to obtain values ​​regarding brightness around the electronic device using each of the plurality of illuminance sensors when executed by the electronic device. The one or more programs may include instructions that trigger the control circuit to identify a value having an error outside a reference range among the values ​​by comparing the values ​​with each other when executed by the electronic device. The one or more programs may include instructions that trigger the control circuit to transmit a signal to an external electronic device via the communication circuit to notify the illuminance sensor among the plurality of illuminance sensors that obtained the value, based on identifying the value having an error outside the reference range among the values ​​when executed by the electronic device. Explanation of the symbols

[0153] Power supply / cutoff unit, control unit, power supply 1, driving unit, illuminance sensor, detector, power supply unit, LED module, communication module, light switch

Claims

Claim 1 An electronic device comprising: a bridge diode; an illuminance sensor; a control unit connected to the illuminance sensor; an LED module whose brightness is controlled by the control unit; a first power source configured to supply power to the control unit and the illuminance sensor in order to drive the control unit and the illuminance sensor; a converter configured to receive power from the bridge diode and supply power to the LED module and the first power source; and a power supply and cutoff unit including a photocoupler connected to the control unit and for controlling the converter based on optical coupling, wherein the control unit identifies the brightness around the electronic device using the illuminance sensor and, based on identifying that the brightness around the electronic device exceeds a reference brightness: turns off the LED module; and controls the photocoupler of the power supply and cutoff unit to stop the power supply from the bridge diode to the converter; and is configured to drive the illuminance sensor using power from the first power source while the power supply from the bridge diode to the converter is stopped. Claim 2 An electronic device according to claim 1, wherein the control unit enters a sleep mode to reduce the power supply to the control unit and the light sensor from the first power source to drive the control unit and the light sensor while the power supply from the bridge diode to the converter is interrupted, periodically interrupts the sleep mode, and periodically, while the sleep mode is interrupted, uses the light sensor to identify the brightness around the electronic device and, based on identifying that the brightness around the electronic device is less than the reference brightness: turns on the LED module; and controls the photocoupler of the power supply and cutoff unit to receive power again from the bridge diode to the converter. Claim 3 The electronic device according to claim 2 further comprises a sensor configured to identify the brightness around the electronic device while the control unit enters a sleep mode; the sensor further configured to transmit a signal to the control unit based on the fact that, while the control unit enters the sleep mode, the brightness around the electronic device is less than another reference brightness that is smaller than the reference brightness, and the control unit configured to: stop the sleep mode and turn on the LED module based on the signal. Claim 4 An electronic device according to claim 1, wherein the power supply and cutoff unit further comprises: a first transistor comprising a resistor having one end connected to the control unit and the other end connected to one end of the photocoupler, a gate electrode connected to the other end of the photocoupler, and a source electrode connected to ground; and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter; wherein the control unit is configured to change the level of a signal applied to the one end of the photocoupler of the power supply and cutoff unit in order to change the states of the first transistor and the second transistor based on identifying, using the illuminance sensor, that the brightness around the electronic device exceeds the reference brightness; and wherein the converter is configured to stop supplying power from the bridge diode to the first power source based on identifying a change in the state of the second transistor through the drain electrode of the second transistor. Claim 5 An electronic device according to claim 1, further comprising a transistor including a gate electrode connected to a control unit, a source electrode connected to ground, and a drain electrode connected to an LED module, wherein the control unit is configured to disable the transistor by transmitting a signal to the gate electrode of the transistor to turn off the power of the LED module based on identifying, using the illuminance sensor, that the brightness around the electronic device exceeds the reference brightness. Claim 6 An electronic device according to claim 1, wherein the first power source further comprises a supercapacitor and a diode comprising an anode connected to one end of the converter and a cathode connected to the supercapacitor. Claim 7 An electronic device according to claim 1, wherein the control unit is configured to control the photocoupler of the power supply and cutoff unit to supply power from the bridge diode to the converter based on detecting the voltage of the first power source and identifying that the detected voltage is less than a reference voltage. Claim 8 An electronic device according to claim 7, wherein the power supply and cutoff unit further comprises a first transistor comprising a resistor having one end connected to the control unit and the other end connected to one end of the photocoupler, a gate electrode connected to the other end of the photocoupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter, wherein the control unit is configured to change the level of a signal applied to the one end of the photocoupler of the power supply and cutoff unit in order to change the states of the first transistor and the second transistor based on identifying that the detected voltage is less than the reference voltage, and the converter is configured to receive the power from the bridge diode based on identifying a change in the state of the second transistor through the drain electrode of the second transistor. Claim 9 An electronic device according to claim 2, further comprising a transistor including a gate electrode connected to a control unit, a source electrode connected to ground, and a drain electrode connected to an LED module, wherein the control unit is configured to activate the transistor by transmitting a signal to the gate electrode of the transistor to turn on the power of the LED module based on identifying, using the illuminance sensor, that the brightness around the electronic device is less than the reference brightness. Claim 10 An electronic device according to claim 2, wherein the control unit controls the turned-on LED module to emit light according to a first brightness based on identifying that the brightness around the electronic device is less than the reference brightness and exceeds another reference brightness, and controls the turned-on LED module to emit light according to a second brightness exceeding the first brightness based on identifying that the other reference brightness is less than the reference brightness and that the brightness around the electronic device is less than the other reference brightness. Claim 11 An electronic device according to claim 7, wherein the control unit detects the voltage of the first power supply, which is charged by the power supply received from the converter; and controls the photocoupler of the power supply and cutoff unit to interrupt the power supply from the bridge diode to the converter based on identifying that the detected voltage reaches another reference voltage higher than the reference voltage. Claim 12 An electronic device according to claim 11, wherein the power supply and cutoff unit further comprises a first transistor comprising a resistor having one end connected to the control unit and the other end connected to one end of the photocoupler, a gate electrode connected to the other end of the photocoupler, and a source electrode connected to ground, and a second transistor comprising a gate electrode connected to the drain electrode of the first transistor, a source electrode connected to ground, and a drain electrode connected to the converter, wherein the control unit is configured to change the level of a signal applied to the one end of the photocoupler of the power supply and cutoff unit in order to change the states of the first transistor and the second transistor based on identifying that the detected voltage reaches the other reference voltage, and the converter is configured to stop the power supply from the bridge diode to the converter based on identifying that the state of the second transistor is changed through the drain electrode of the second transistor. Claim 13 An electronic device according to claim 1, wherein the first power source comprises a supercapacitor or a secondary battery. Claim 14 An electronic device according to claim 1, further comprising a voltage comparator including one end comprising a non-inverter terminal to which a reference voltage is applied and an inverter terminal connected to the illuminance sensor, and the other end connected to the control unit; wherein the control unit is configured to control the photocoupler of the power supply and cutoff unit to supply the power from the bridge diode to the converter based on identifying, through the other end of the comparator, that a voltage corresponding to the reference voltage is applied to the comparator from the illuminance sensor through the inverter terminal of the comparator, and identifying that a voltage corresponding to the reference voltage is applied to the comparator through the inverter terminal of the comparator. Claim 15 An electronic device according to claim 14, wherein the control unit is configured to turn on the LED module based on identifying the brightness around the electronic device using the illuminance sensor and identifying that the brightness around the electronic device is less than the reference brightness. Claim 16 An electronic device according to claim 15, further comprising a transistor including a gate electrode connected to a control unit, a source electrode connected to ground, and a drain electrode connected to an LED module, wherein the control unit is configured to activate the transistor by transmitting a signal to the gate electrode of the transistor to turn on the power of the LED module based on identifying, using the illuminance sensor, that the brightness around the electronic device is less than the reference brightness. Claim 17 An electronic device according to claim 15, wherein the control unit controls the turned-on LED module to emit light according to a first brightness based on identifying that the brightness around the electronic device is less than the reference brightness and exceeds another reference brightness, and controls the turned-on LED module to emit light according to a second brightness less than the first brightness based on identifying that the other reference brightness is less than the reference brightness and that the brightness around the electronic device is less than the other reference brightness. Claim 18 An electronic device according to claim 1, further comprising a communication circuit connected to the control unit, wherein the illuminance sensor is composed of a plurality of illuminance sensors, and the control unit is configured to acquire values ​​for brightness around the electronic device using each of the plurality of illuminance sensors, identify a value having an error outside a reference range among the values ​​by comparing the values ​​with each other, and, based on identifying the value having an error outside the reference range among the values, transmit a signal to an external electronic device through the communication circuit to notify the illuminance sensor among the plurality of illuminance sensors that has acquired the value. Claim 19 delete Claim 20 delete

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