WO2018206009A1

WO2018206009A1 - Smart light bulb

Info

Publication number: WO2018206009A1
Application number: PCT/CN2018/086646
Authority: WO
Inventors: Yehua Wan; Jinxiang Shen
Original assignee: Zhejiang Shenghui Lighting Co., Ltd.
Priority date: 2017-05-12
Filing date: 2018-05-14
Publication date: 2018-11-15
Also published as: CN107135571B; CN107135571A

Abstract

A smart light bulb is provided, including: a voltage-current conversion circuit, a light detection circuit, a LED light sensor, and a LED lighting circuit. The LED light sensor is configured to output a luminance variance signal to the light detection circuit by sensing the luminance variance of the LED lighting circuit. The light detection circuit is configured to generate a light-adjusting command based on the luminance variance signal and to output the light-adjusting command to the voltage-current conversion circuit. The voltage-current conversion circuit is configured to adjust the brightness and/or color temperature of the LED lighting circuit based on the light-adjusting command.

Description

SMART LIGHT BULB

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority to Chinese Patent Application No. 201710335420.9 filed on May 12, 2017, the entire content of which is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure generally relates to the technical field of LED lighting, and more particularly, relates to a smart light bulb, especially a light bulb that realizes switching based on light detection.

BACKGROUND

In existing LED light bulbs, especially the LED light bulbs that can switch between various colors and luminance levels, a switch often needs to be configured corresponding to each lighting state. This approach not only causes inconvenience to the users, but also increases the number of switches needed for the lights.

Directed to address the aforementioned issues, the current LED lighting products use the approach of circuit detection to implement functions such as adjusting the brightness and color temperature. Often by configuring a switch-state detecting circuit to detect a variance in the current signal or the voltage signal, the lighting products can determine whether the lighting state needs to be switched.

However, when affected by a periphery circuit, a detecting circuit can be triggered by accident or fail to be triggered. For example, when the portion of the LED-light-bulb control circuit is connected to a silicon-control switch, the voltage or current in the circuit may be easily distorted or become instable, which impacts the switch-state detecting circuit and reduces the accuracy of light switching.

BRIEF SUMMARY OF THE DISCLOSURE

The present disclosure provides a smart light bulb, directed to solving the misjudgment issue caused by the periphery circuit disturbing the voltage or current of the circuit in the smart light bulb, thereby effectively improving the light-switching accuracy of the smart light bulb.

The disclosed smart light bulb may include: a voltage-current conversion circuit, a light detection circuit, a LED light sensor, and a LED lighting circuit. The LED light sensor is configured to output a luminance variance signal to the light detection circuit by sensing the luminance variance of the LED lighting circuit. The light detection circuit is configured to generate a light-adjusting command based on the luminance variance signal and to output the light-adjusting command to the voltage-current conversion circuit, where the light-adjusting command is configured to adjust the brightness and/or color temperature of the LED lighting circuit. The voltage-current conversion circuit is configured to adjust the brightness and/or color temperature of the LED lighting circuit based on the light-adjusting command.

Optionally, the smart light bulb further includes a rectifier circuit coupled to the voltage-current conversion circuit. The rectifier circuit is configured to convert the alternating current (AC) input by an external power supply to a direct current (DC) , and to output the direct current to the voltage-current conversion circuit.

Optionally, the voltage-current conversion circuit is specifically configured to adjust the voltage and/or current of the direct current based on the light-adjusting command, and to output the adjusted direct current to the LED lighting circuit.

Optionally, the light detection circuit is specifically configured to, when generating the light-adjusting command based on the luminance variance signal, determine whether the luminance variance signal is an effective signal. When the luminance variance signal is the effective signal, the light detection circuit generates the light-adjusting command based on the luminance variance signal.

Optionally, the smart light bulb further includes: a control switch. The light detection circuit is specifically configured to: determine whether the time interval between “ON” and “OFF” of the control switch is longer than a preset period of time. If the time interval between the “ON” and “OFF” of the control switch is longer than the preset period of time, the luminance variance signal sent by the LED light sensor is determined to be a noneffective signal. If the time interval between the “ON” and “OFF” of the control switch is shorter than or equal to the preset period of time, the luminance variance signal sent by the LED light sensor is determined to be an effective signal.

Optionally, the light detection circuit includes a voltage-stabilizing circuit and a processor, where the voltage-stabilizing circuit is electrically connected to the processor. The voltage-stabilizing circuit is configured to provide a stable voltage to the processor. The processor is configured to input an electric signal that corresponds to the luminance variance signal output by the LED light sensor, and to determine whether the luminance variance signal is an effective signal. If the luminance variance signal is an effective signal, the processor generates a corresponding luminance adjusting command based on the luminance variance signal and outputs the luminance adjusting command to the voltage-current conversion circuit.

Optionally, the smart light bulb further includes a capacitor, and the preset period of time is shorter than or equal to a discharging period of the capacitor.

Optionally, the voltage-current conversion circuit includes anyone of followings: DC-DC converter, buck converter, boost converter, buck-boost converter, single-ended primary-inductor converter, power converter, and half-bridge circuit.

Optionally, the color temperature includes: warm yellow light, white light, warm white light, and color light.

By using the light detection circuit and the LED light sensor to sense the variance of the luminance of the LED lighting circuit, whether the brightness and/or color temperature of the LED lighting circuit needs to be adjusted may be determined through the variance in the luminance. Thus, the current or the variance of the current in the smart light bulb does not need to be detected to determine whether the brightness and/or color temperature of the LED lighting circuit needs to be adjusted. Thus, the misjudgment issue caused by the periphery circuit disturbing the voltage or current of the circuit in the smart light bulb is avoided, which effectively improves the light-switching accuracy of the smart light bulb.

BRIEF DESCRIPTION OF THE DRAWINGS

To more clearly illustrate the technical solutions in embodiments of the present disclosure or the prior art, the accompanying drawings of the present disclosure or the prior art are briefly introduced hereinafter. Obviously, the accompanying drawings merely provide certain exemplary implementations, based on which, other drawings or implementations may be obtainable by those ordinarily skilled in the relevant art without creative labor.

FIG. 1 is a structural schematic view of a smart light bulb consistent with embodiments of the present disclosure;

FIG. 2 is a structural schematic view of another smart light bulb consistent with embodiments of the present disclosure;

FIG. 3 is a structural schematic view of another smart light bulb consistent with embodiments of the present disclosure;

FIG. 4 is a structural schematic view of another smart light bulb consistent with embodiments of the present disclosure; and

FIG. 5 is a structural schematic view of another smart light bulb consistent with embodiments of the present disclosure.

DETAILED DESCRIPTION

To make the objectives, technical solutions, and advantages of the present disclosure clearer, with reference to the accompanying drawings of the present disclosure, technical solutions of the present disclosure are described more fully hereinafter. Obviously, the disclosed embodiments only provide some exemplary implementations. Based on the disclosed embodiments, other embodiments obtainable by those ordinarily skilled in the relevant art without creative labor shall all fall within the protection scope of the present disclosure.

FIG. 1 is a structural schematic view of a smart light bulb consistent with embodiments of the present disclosure. As shown in FIG. 1, a smart light bulb may include: a voltage-current conversion circuit 10, a light detection circuit 40, a LED light sensor 30, and a LED lighting circuit 20. The LED light sensor 30 is configured to output a luminance variance signal to the light detection circuit 40 by sensing a variance of the luminance of the LED lighting circuit 20. The light detection circuit 40 is configured to generate a light-adjusting command based on the luminance variance signal and to output a light-adjusting command to the voltage-current conversion circuit 10. The light-adjusting command is configured to adjust the brightness and/or color temperature of the LED lighting circuit 20. The voltage-current conversion circuit 10 is configured to adjust the brightness and/or color temperature of the LED lighting circuit 20 based on the light-adjusting command.

When the LED lighting circuit 20 generates a corresponding luminance variance due to conduction or dis-conduction of the circuit, the LED light sensor 30 may sense the variance in the luminance sent by the LED lighting circuit 20 in real time. More specifically, the LED light sensor may include various photo-sensitive devices, and when a photo-sensitive device senses a change in the luminance, the photo-sensitive device may form a corresponding luminance variance signal. For example, the luminance variance signal may reflect a variance in the current and/or voltage of the circuit caused by a change in the resistance. The light detection circuit 40 may generate a light-adjusting command based on the luminance variance signal sent by the LED light sensor 30 and may send the light-adjusting command to the voltage-current conversion circuit 10. The voltage-current conversion circuit 10 may adjust the brightness and/or color temperature of the LED lighting circuit 20 based on the light-adjusting command.

By using the light detection circuit and the LED light sensor to sense the variance in the luminance of the LED lighting circuit, whether the brightness and/or color temperature of the LED lighting circuit needs to be adjusted may be determined through the variance in the luminance. Thus, the current or the variance of the current in the smart light bulb does not need to be detected to determine whether the brightness and/or color temperature of the LED lighting circuit needs to be adjusted. Thus, the misjudgment issue caused by the periphery circuit disturbing the voltage or current of the circuit in the smart light bulb is avoided, which effectively improves the light-switching accuracy of the smart light bulb.

FIG. 2 is a structural schematic view of another smart light bulb consistent with embodiments of the present disclosure. As shown in FIG. 2, based on the smart light bulb shown in FIG. 1, the smart light bulb may further include a rectifier circuit 50 connected to the voltage-current conversion circuit 10. The rectifier circuit 50 is configured to convert the alternating current (AC) input by an external power supply to a direct current (DC) , and to output the direct current to the voltage-current conversion circuit 10.

In other words, the AC input by the external power supply may first undergo a rectifying process by the rectifier circuit 50, and by configuring the rectifier circuit 50 at the input end of the voltage-current converter circuit 10, the AC of the external input power supply is converted into DC. Accordingly, the smart light bulb can receive power supply from the AC power supply, such that the application range of the smart light bulb is extended.

It should be noted that, the disclosed rectifier circuit 50 may include: whole bridge rectifier or half-bridge rectifier. The present disclosure is not limited thereto.

FIG. 3 is a structural schematic view of another smart light bulb consistent with embodiments of the present disclosure. As shown in FIG. 3, based on a smart light bulb shown in FIG. 1 and FIG. 2, the smart light bulb may further include a control switch 60. The control switch 60 may perform communication connection with the voltage-current conversion circuit 10.

The switching-on action of the control switch 60 may enable the smart light bulb to be in a power-on state, and the switching-off action of the control switch 60 may enable the smart light bulb to be in a power-off state. When the control switch 60 is switched on, the externally input electrical energy is first converted into DC via the rectifier circuit 50, and the DC is further converted into low-voltage DC for use by the LED lighting circuit via the voltage-current conversion circuit 10.

In the disclosed embodiments, the LED light sensor 30 senses the variance in the luminance of the LED lighting circuit 20 and generates a luminance variance signal. The light detection circuit 40 generates a light-adjusting command based on the luminance variance signal sent by the LED light sensor 30. Specifically, each time the control switch 60 executes a switching-on or switching-off action within a preset period of time, the LED lighting circuit 20 generates a corresponding luminance variance. The luminance variance can be sensed by the LED light sensor 30, such that the LED light sensor 30 may generate the luminance variance signal based on the luminance variance of the LED lighting circuit 20.

Optionally, the voltage-current conversion circuit 10 in any of aforementioned embodiments may be specifically configured to adjust the voltage and/or current of the direct current based on the light-adjusting command, and to output the adjusted direct current to the LED lighting circuit.

Optionally, the light detection circuit 40 is specifically configured to, when generating the light-adjusting command based on the luminance variance signal, determine whether the luminance variance signal is an effective signal. When the luminance variance signal is an effective signal, the light detection circuit generates the light-adjusting command based on the luminance variance signal.

Optionally, the light detection circuit 40 is specifically configured to: determine whether the time interval between “ON” and “OFF” of the control switch 60 is longer than a preset period of time. If the time interval between the “ON” and “OFF” of the control switch 60 is longer than the preset period of time, the luminance variance signal sent by the LED light sensor 30 is determined to be a noneffective signal. If the time interval between the on-and-off of the control switch 60 is shorter than or equal to the preset period of time, the luminance variance signal sent by the LED light sensor 30 is determined to be an effective signal.

The LED lighting circuit 20 may generate luminance variance due to the switching-off and switching-on actions of the control switch 60, and the luminance variance may be sensed by the LED light sensor to generate a corresponding luminance variance signal. The luminance variance signal may include the information of time interval between the switching-off and switching-on actions of the control switch 60. By comparing the time interval between the switching-off and switching-on actions of the control switch 60 to the duration of the preset period of time, whether the luminance variance signal is an effective signal may be determined.

Optionally, based on the smart light bulb of any aforementioned embodiments, the smart light bulb may further include a capacitor. The capacitor may be configured to provide temporal electrical energy to the voltage-current conversion circuit 10, the LED light sensor 30, and the light detection circuit 40, when the smart light bulb is in the power-off state. According to the present disclosure, the preset period of time may be shorter than or equal to the discharging period of the capacitor.

Given the capacitor as an example, when circuit formed by the smart light bulb and the external power supply of the smart light bulb is in a conducted state, the external power supply charges the capacitor. When the circuit formed by the smart light bulb and the external power supply of the smart light bulb is in a dis-conducted state, the capacitor continues to provide temporal electrical energy to the voltage-current conversion circuit 10, the LED light sensor 30, and the light detection circuit 40. The duration that the capacitor can provide temporal electrical energy depends on the capacitance of the capacitor, i.e., the duration that the capacitor is able to discharge when the external power supply is cut off.

It should be noted that, while the capacitor is given as an example, other devices that provide temporal electrical energy to the smart light bulb can also be used to replace the capacitor. The working principles and technical effects of these devices are similar to that of the capacitor, which are not repeated herein.

FIG. 4 is a structural schematic view of another smart light bulb consistent with embodiments of the present disclosure. As shown in FIG. 4, the smart light bulb shown in FIG. 4 is based on the smart light bulb shown in FIGs. 1-3, where the light detection circuit 40 includes a voltage-stabilizing circuit and a processor (a microprocessor is given as an example for illustration in FIG. 4) . The voltage-stabilizing circuit is electrically connected to the processor, and the voltage-stabilizing circuit is configured to provide a stable voltage to the processor. The processor is configured to input an electric signal corresponding to the luminance variance signal that is sent by the LED light sensor, and to determine whether the luminance variance signal is an effective signal. If the luminance variance signal is an effective signal, the processor generates the corresponding luminance adjusting command based on an electric signal corresponding to the luminance variance signal and outputs the luminance adjusting command to the voltage-current conversion circuit.

In some embodiments, the LED lighting circuit may generate corresponding luminance variance based on the consecutive conduction and dis-conduction of the circuit. The LED light sensor may sense the variance in the luminance of the LED lighting circuit in real time and convert the luminance variance into a corresponding luminance variance signal, where the luminance variance signal may be an electrical signal generated by the LED light sensor in response to the luminance variance. The processor receives the electric signal corresponding to the luminance variance signal sent by the LED light sensor and determines whether the luminance variance signal is an effective signal. If the luminance variance signal is an effective signal, the processor generates a corresponding luminance adjusting command based on the luminance variance signal and outputs the luminance adjusting command to the voltage-current conversion circuit. The disclosed processor may receive and process the luminance variance signal sent by the LED light sensor in real time and analyze each conduction and dis-conduction of the circuit, which improves the adjusting accuracy of the LED lighting circuit.

Specifically, the example shown in FIG. 4 is illustrated in detail. The output end of the rectifier circuit in FIG. 4 that outputs DC is electrically connected to the input end of the voltage-stabilizing circuit (Q1 shown in FIG. 4) through a first divider resistor (R2 shown in FIG. 4) , and the voltage-stabilizing circuit Q1 provides a stable voltage to the integrated circuit (IC) of the microprocessor. The resistance of the photosensitive resistor (RS, such as LED light sensor, U5 shown in FIG. 4) may be varied based on the variance of the light intensity. The stronger the light intensity, the smaller the resistance of the photosensitive resistor (RS) of the light sensor, and the voltage signal received by the IC of the microprocessor also varies.

When the light becomes stronger, based on the divider circuit of the photoresistor (RS) of the light sensor and the second divider resistor (R3, as shown in FIG. 4) , the voltage signal received by the IC of the microprocessor is enhanced, and when the voltage signal is greater than a certain threshold, the IC of the microprocessor considers the electricity signal to be an effective signal. When receiving consecutive effective signals within a defined period of time, the IC of the microprocessor sends the light-adjusting command to the voltage-current conversion circuit, and the voltage-current conversion circuit is used to control the current output of the LED.

The IC of the microprocessor may also be used to record the current state of the LED lighting circuit, and when the IC of the microprocessor once again receives consecutive effective signals within a defined period of time, the IC of the microprocessor sends the light-adjusting command to the voltage-current conversion circuit, such that the voltage-current conversion circuit outputs a voltage or current that has a state different from the current state of the LED lighting circuit. Based on the switching rules of different voltages or current, the cycling of switching operation of the LED lighting circuit in different lighting states may be implemented.

Specifically, the smart light bulb provided by FIG. 4 may include: an external AC power supply (e.g., U0 illustrated in FIG. 4) , a first capacitor (C1 illustrated in FIG. 4) , a control switch (e.g., S1 illustrated in FIG. 4) , an inductor (L1 shown in FIG. 4) , a rectifier circuit (U1 shown in FIG. 4) , a second capacitor (C2 shown in FIG. 4) , a voltage-current conversion circuit (U2 shown in FIG. 4) , a diode (D1 shown in FIG. 4) , and a transformer (T1 shown in FIG. 4) . The smart light bulb may further include: a third capacitor (C3 shown in FIG. 4) , an LED lighting circuit (U6 shown in FIG. 4) , a first resistor (R1 shown in FIG. 4) , a first divider resistor (R2 shown in FIG. 4) , a voltage-stabilizing diode (Z1 shown in FIG. 4) , a fourth capacitor (C5 shown in FIG. 4) , a light detection circuit (U4 shown in FIG. 4) , and an LED light sensor (U5 shown in FIG. 4) .

When the control switch S1 is switched on, the external AC power supply U0 charges the first capacitor C1, and the AC output by the external AC power supply U0 is transmitted to the input end of the rectifier circuit U1. The output end of the rectifier circuit U1 transmits the rectified DC, and the rectified DC first undergoes a wave-filtering process of the second capacitor C2 (using the properties of a capacitor to block the AC) and is then divided into two branches. The first branch is transmitted to the light detection circuit U4 via the first divider resistor R2, and the other branch is transmitted to the LED lighting circuit U6 after travelling through the voltage-current conversion circuit U2 and the transformer T1.

The LED light sensor U5 is electrically connected to the light detection circuit U4. When the control switch S1 changes from an “ON” state to an “OFF” state, the external power supply U0 stops supplying power, and the first capacitor C1 provides temporal electrical energy to the light detection circuit U4, the LED light sensor U5, and the voltage-current conversion circuit U2. Because the discharging curve of the first capacitor C1 attenuates exponentially, the luminance of the LED lighting circuit U6 changes from bright to dark, and the process of the luminance changing from bright to dark is sensed by the LED light sensor to generate a corresponding luminance variance signal.

Within the period of time when the electricity of the first capacitor C1 is not fully discharged, the control switch S1 changes from the “OFF” state to the “ON” state, and the external power supply charges the first capacitor C1 and provides electrical energy to the voltage-current conversion circuit U2, the LED lighting circuit U6, and the light detection circuit U4. The brightness of the LED lighting circuit U6 changes from dark to bright, and the entire process of the brightness changing from bright to dark and further from dark to bright occurs within the discharging period of the first capacitor C1. Thus, the light detection circuit U4 generates a light-adjusting command, and the light-adjusting command is used to drive the voltage-current conversion circuit U2 to change the voltage and/or current transmitted to the LED lighting circuit U6, thereby realizing the adjustment of the brightness and/or color temperature of the LED lighting circuit U6.

FIG. 5 is a structural schematic view of another smart light bulb consistent with embodiments of the present disclosure. As shown in FIG. 5, based on the smart light bulb illustrated in FIG. 4, the smart light bulb shown in FIG. 5 may further include: a plurality of voltage-current conversion circuits and a plurality of LED lighting circuits, where the number of the voltage-current conversion circuit corresponds to the number of LED lighting circuits. In some embodiments, the number of the voltage-current conversion circuit may be equal to the number of LED lighting circuits. For example, there may be wo voltage-current conversion circuits (e.g., the voltage-current conversion circuit U2 and the voltage-current conversion circuit U7, shown in FIG. 5) and two corresponding LED lighting circuits (the LED lighting circuit U6 and the LED lighting circuit U8, shown in FIG. 5) . The present disclosure is not limited thereto.

In some embodiments, one external power supply U0 may provide power supply to a plurality of voltage-current conversion circuits and a corresponding number of LED lighting circuits, and one light detection circuit and the LED light sensor may sense the variance in the luminance sent by all LED lighting circuits. The LED light sensor generates a corresponding luminance variance signal based on the variance in the luminance and sends the luminance variance signal to the light detection circuit. The light detection circuit generates a corresponding light-adjusting command to all voltage-current conversion circuits, thus adjusting the brightness and/or color temperature of the plurality of LED lighting circuits. For example, the light detection circuit may generate and send the light-adjusting command to a plurality of voltage-current conversion circuits (e.g., U2 and U7 in FIG. 5) , thus adjusting the brightness and color temperature of the plurality of LED lighting circuits.

Further, the specific implementation processes of aforementioned embodiments can refer to descriptions of the principles of the smart light bulb shown in FIG. 4, which are not repeated herein.

Optionally, the voltage-current conversion circuit of the smart light bulb provided by any above-described embodiment may include anyone of followings: DC-DC converter, buck converter, boost converter, buck-boost converter, single-ended primary-inductor converter, power converter, and half-bridge circuit. The present disclosure is not limited thereto.

Optionally, the color temperature emitted by the LED lighting circuit 20 of the smart light bulb provided by any above-described embodiment may include: warm yellow light, white light, warm white light, and color light.

In some embodiments, the smart light bulb is first in the “ON” state, and the light of the LED lighting circuit 20 is stabilized at a fixed state. When the color temperature and/or brightness of the LED lighting circuit needs to be switched, a continuous switching signal may be supplied to the circuit where the smart light bulb is in, and the continuous switching signal may make the brightness of the lightning circuit 20 to vary between bright and dark.

Further, the LED light sensor 30 senses the variance in the illuminance of the LED lighting circuit 20. Specifically, each pair of consecutive “ON” and “OFF” actions corresponds to a bright-dark variance of the illuminance, and the LED light sensor 30 generates a corresponding luminance variance signal. The light detection circuit 40 receives the luminance variance signal and determines whether the luminance variance signal is an effective signal or not.

If the luminance variance signal is an effective signal, a light-adjusting command is sent to the voltage-current conversion circuit 10. The light detection circuit 40 is further configured to record the lighting state of the current LED lighting circuit 20, and each light-adjusting command drives the voltage-current conversion circuit 10 to adjust the brightness and/or color temperature of the LED lighting circuit 20.

The variance of the brightness and/or color temperature of the LED lighting circuit 20 is defined based on the user or the manufacturer. For example, the illuminance variance rule may include the brightness of dark, bright, and high-bright forming a cycle, and the color temperature variance rule may include the color temperature of the warm yellow light, white light, warm white light, and the color light forming a cycle.

In some embodiments of the present disclosure, the LED light sensor, the light detection circuit, the voltage current conversion circuit, the rectifier circuit, and the control switch may be integrated into a smart light bulb with the LED lighting circuit. In some embodiments, one or more of the components such as the LED light sensor, the light detection circuit, the voltage current conversion circuit, the rectifier circuit, and the control switch, may be implemented outside a smart light bulb with the LED lighting circuit. In some embodiments, one or more of the components such as the LED light sensor, the light detection circuit, the voltage current conversion circuit, the rectifier circuit, and the control switch, may be implemented outside multiple smart light bulbs each with one or more LED lighting circuits. The function of the LED light sensor, the light detection circuit, the voltage current conversion circuit, the rectifier circuit, and the control switch, etc., are similar to those described in relation to FIGs. 1-3.

It should be noted that, adjustment may be performed combining the brightness and the color temperature, and related adjustment solutions are obtainable from the aforementioned embodiments, which are not repeated herein.

Those ordinarily skilled in the relevant art may understand that: all or a part of steps of the aforementioned method embodiments may be fulfilled through program command-related hardware. The aforementioned program may be stored in a computer-readable storage medium, and when the program is executed, the steps of the aforementioned method embodiments are executed. The aforementioned storage medium includes various media including ROM, RAM, magnetic disc, or optical disc.

Lastly, it should be illustrated that: the aforementioned embodiments are merely used to illustrate the technical solutions of the present disclosure, but not intended to be limiting. Though the present disclosure is illustrated in detail with reference to the aforementioned embodiments, those ordinarily skilled in the relevant art shall understand that, the technical solutions recorded in the aforementioned embodiments can be modified or a part of or all technical features may be equivalently replaced. Such modification or replacement shall not enable the nature of the corresponding technical solutions to depart from the scope of the technical solutions of the present disclosure.

Claims

A smart light bulb, comprising:

a voltage-current conversion circuit;

a light detection circuit;

a LED light sensor; and

a LED lighting circuit,

wherein the LED light sensor is configured to output a luminance variance signal to the light detection circuit by sensing a luminance variance of the LED lighting circuit,

the light detection circuit is configured to generate a light-adjusting command based on the luminance variance signal, and to output the light-adjusting command to the voltage-current conversion circuit, and

the voltage-current conversion circuit is configured to adjust the brightness and/or color temperature of the LED lighting circuit based on the light-adjusting command.
The light bulb according to claim 1, further comprising:

a rectifier circuit coupled to the voltage-current conversion circuit,

wherein the rectifier circuit is configured to convert an alternating current (AC) output by an external power supply to a direct current (DC) and output the DC to the voltage-current conversion circuit.
The light bulb according to claim 1, wherein:

the voltage-current conversion circuit is configured to, based on the light-adjusting command, adjust voltage and/or current of the DC and output the adjusted DC to the LED lighting circuit.
The light bulb according to claim 1, wherein:

the light detection circuit is configured to determine whether the luminance variance signal is an effective signal when generating the light-adjusting command based on the luminance variance signal, and

when the luminance variance signal is an effective signal, the light detection circuit generates a light-adjusting command based on the luminance variance signal.
The light bulb according to claim 1, further comprising:

a control switch,

wherein the light detection circuit is configured to determine whether a time interval between “ON” and “OFF” of the control switch is longer than a period of time,

if the time interval between the “ON” and “OFF” of the control switch is longer than the period of time, the luminance variance signal sent by the LED light sensor is determined to be a noneffective signal, and

if the time interval between the “ON” and “OFF” of the control switch is shorter than or equal to the period of time, the luminance variance signal sent by the LED light sensor is determined to be an effective signal.
The light bulb according to claim 5, further comprising:

a capacitor,

wherein the period of time is shorter than or equal to a discharging period of the capacitor.
The light bulb according to claim 1, wherein:

the light detection circuit includes a voltage-stabilizing circuit and a processor, the voltage-stabilizing circuit being electrically connected to the processor,

the voltage-stabilizing circuit is configured to provide a stable voltage to the processor,

the processor is configured to input an electric signal corresponding to the luminance variance signal output by the LED light sensor and to determine whether the luminance variance signal is an effective signal, and

when the luminance variance signal is determined to be an effective signal, the processor generates a light-adjusting command based on an electric signal corresponding to the luminance variance signal, and outputs the light-adjusting command to the voltage-current conversion circuit.
The light bulb according to claim 1, wherein:

the voltage-current conversion circuit includes any one of followings: DC-DC converter, buck converter, boost converter, buck-boost converter, single-ended primary-inductor converter, power converter, and half-bridge circuit.
The light bulb according to claim 1, wherein:

the color temperature includes: a warm yellow light, a white light, a warm white light, and a multi-color light.