CN108882430A - LED lamp with automatic light-adjusting function - Google Patents

Abstract

the invention relates to a light-emitting diode lamp with an automatic dimming function, which comprises a power supply module, an L ED lamp string, a sensing module, a control signal generation module and a dimming switch module, wherein the power supply module is electrically connected to a power supply to receive electric energy, the L ED lamp string is electrically connected to the power supply module to receive the electric energy, the sensing module and the control signal generation module are electrically connected to a first node and a second node of the L ED lamp string to receive the electric energy, and the dimming switch module is connected with the L ED lamp string in parallel.

Description

LED lamps with automatic dimming function

technical field

The invention relates to a light-emitting diode lamp, in particular to a light-emitting diode lamp with automatic dimming function.

Background technique

At present, the lamps and lanterns on the market can be roughly divided into two types, one is a light tube, the other is a light bulb, and the light tube can be further divided into a traditional fluorescent tube or a light-emitting diode (LED) light tube, and a light bulb can be further distinguished For traditional tungsten bulbs, energy-saving bulbs or LED bulbs.

Generally, the fluorescent lamp needs to convert the mains power into a high-frequency alternating current by installing a ballast on the lamp holder to drive the fluorescent lamp. The LED lamp is driven by a DC power supply, so some LED lamps have a built-in power converter, which converts the mains power into a DC power supply for driving the LED lamp, or sets the power converter in a position used to install the LED lamp. On the lamp holder, through the power converter on the lamp holder, the mains power is converted into a DC power supply for driving the LED lamp tube.

In order to meet the needs of environmental protection, the existing lighting equipment will have the function of daylight harvesting. The lighting equipment with daylight saving function is dimmable, and the lighting brightness will change with the ambient brightness to reduce the power consumption of the lighting equipment while providing sufficient brightness. However, the original fluorescent tube does not have a dimmable function. If it is to be dimmable, the ballast on the lamp holder needs to be replaced with a ballast with a dimmable function. But ballasts with dimmable functions are expensive and have a small dimming range. In addition, it is not enough to have a dimmable ballast, and a photosensitive sensor is also required to receive ambient light. In addition, a control system is required for negative feedback control. When the ambient light is strong, the control system will reduce the brightness of the lamp, and when the ambient light is weak, the control system will increase the brightness of the lamp. Make the total brightness received by the light sensor be a constant.

The LED light tube itself does not have a dimmable function, so it is necessary to install a dimmable LED driver on the lamp where the LED light tube is located. And the adjustable light driver can be connected to the mains to receive electric energy, and perform dimming control on the LED lamp tube.

In addition, whether it is a ballast or an LED driver with a dimmable function, a dimmer and a dimming signal line need to be installed separately. The brightness of the lamp is changed by the knob of the dimmer. Common dimmers include Triac dimming and 0-10V dimming. Among them, Triac dimming is dimming by cutting the phase angle of the mains. 0-10V dimming is to control the dimmable ballast or LED driver by transmitting 0-10V DC voltage. There is also a power switch of the lighting equipment for dimming, and the dimming method is controlled by the number of lighted tubes. For example, when the power switch is turned on for the first time, the lighting device controls all four lamp tubes to light up together. Turn off and then turn on the power switch immediately, the lighting equipment will only light up two of the lamps, and so on, if only one lamp is lit at the moment, after the next dimming, all four lamps will be turned on together. So cycle dimming.

It can be known from the above that whether it is a ballast with dimmable function or a dimmable LED driver, it is installed on the lamp holder and uses the mains as the power source. Therefore, it is necessary to change the circuit of the lamp holder during installation. And because the ballast or dimmer with dimming function uses mains power as the power source, the ballast or dimmer with dimming function must have a power converter to convert the mains power into Receivable power supply increases the complexity and cost of installation and replacement, which further affects users' willingness to replace and makes implementation difficult. Therefore, the existing technology must be further improved.

Contents of the invention

In view of the high complexity and cost of installation and replacement of existing ballasts or dimmers with dimming functions, which affect users' willingness to replace them, the present invention provides a light-emitting diode with automatic dimming function Lamps are convenient for users to replace.

The light-emitting diode (LED) lamp with automatic dimming function includes:

A power module has two power input terminals, a positive output terminal and a negative output terminal; wherein the two power input terminals of the power module are electrically connected to a power supply through a power switch;

At least one light-emitting diode (LED) string is electrically connected between the positive and negative output terminals of the power module, and includes a plurality of light-emitting diodes (LEDs) connected in series; wherein the at least one LED string has a first a node and a second node;

A sensing module, electrically connected to the first node and the second node of the at least one LED light string, to receive the operating voltage, and to correspond to at least one sensing signal according to the sensed environmental state, and output the at least one sensing signal Signal;

A control signal generating module, electrically connected to the first node and the second node of the at least one LED light string to receive the working voltage, and electrically connected to the sensing module to receive the at least one sensing signal, and according to the at least one The sensing signal generates a control signal, and outputs the control signal;

A dimming switch module, electrically connected between the positive output terminal and the negative output terminal of the power supply module, so as to be connected in parallel with the at least one LED lamp series, and electrically connected to the control signal generating module, so as to receive the control signal and perform The control signal controls whether the connection between the positive output terminal and the negative output terminal of the power module is conducted.

The LED lamp with automatic dimming function of the present invention has an automatic dimming function, can sense the environmental state through the sensing module, and generate the sensing signal, and generate the sensing signal through the control signal generating module. The control signal is used to control the dimming switch module, thereby dimming the at least one LED lamp string. And the sensing module and the control signal generating module are electrically connected to the first node and the second node of the at least one LED light string to receive the working voltage. Therefore, the at least one LED light string not only has the function of emitting light, but also through The characteristics of the forward conduction bias of the diode can further use the LEDs in the at least one LED light string to divide the voltage, so as to provide a suitable working voltage to the sensing module and the control signal generating module, so that the sensing module and the The control signal generating module can directly obtain a suitable working voltage through the at least one LED light string, without setting another power converter to convert the power, which can further save production cost.

Therefore, the user only needs to directly install the LED lamp with automatic dimming function of the present invention on the original lamp holder to have the automatic dimming function and achieve the effect of saving electric energy. At the same time, the installation is quite convenient and useful Helps increase users' willingness to change.

In addition, the dimming switch module in the present invention is connected in parallel with the at least one LED lamp string, and the dimming control is performed by bypass conduction, that is to say, when the dimming switch module is turned on, the current will directly Through the dimming switch module, no current will flow through the at least one LED light string, so that the at least one LED light string is temporarily turned off to stop emitting light. At the same time, although the at least one LED light string has no current flowing temporarily, the The sensing module and the control signal generating module are temporarily unable to receive the working voltage, but generally speaking, the sensing module and the control signal generating module will be provided with capacitors, so temporarily stopping the power supply will not affect, and can It can work normally, and when the dimming switch module is disconnected, the current will flow through the at least one LED light string, so that the at least one LED light string starts to emit light. Therefore, the present invention adjusts the brightness by controlling the on and off of the dimmer switch module and controlling the lighting time of the at least one LED light string. Not out, so it will not affect the user's use. In this way, the dimming function can be achieved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1 is a schematic block diagram of a preferred embodiment of the present invention.

FIG. 2 is a schematic block diagram of another preferred embodiment of the present invention.

FIG. 3 is a schematic circuit diagram of a voltage stabilizing module in another preferred embodiment of the present invention.

FIG. 4 is a schematic block diagram of another preferred embodiment of the present invention.

FIG. 5 is a schematic circuit diagram of a voltage stabilizing module according to another preferred embodiment of the present invention.

FIG. 6 is a schematic circuit diagram of a light source sensing unit of the present invention.

FIG. 7 is a schematic block diagram of a control signal generating module of the present invention.

Figure number:

10 LED lamps with automatic dimming function

11 power module

12 LED String Lights

13 Sensing module 131 Object sensing unit

132 Light source sensing unit 1321 Photoresistor

1322 fixed resistor

14 control signal generation module 141 conversion unit

142 memory unit 143 microcontroller unit

144 comparison unit 145 signal generation unit

146 buffer units

15 dimmer switch module

16 Regulator Module 161 Low Dropout Linear Regulator

20 power switch

30 power supply

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

The technical means adopted by the present invention to achieve the intended purpose are further described below in conjunction with the drawings and preferred embodiments of the present invention.

Please refer to FIG. 1, the present invention is a light-emitting diode (LED) lamp 10 with automatic dimming function, which includes a power supply module 11, at least one LED light string 12, a sensing module 13, and a control signal generating module. 14 and a dimmer switch module 15.

The power module 11 has two power input terminals, a positive output terminal and a negative output terminal. The two power input terminals are electrically connected to a power source 30 through a power switch 20 to receive power. In this preferred embodiment, the negative output terminal of the power module 11 is a ground terminal.

The at least one LED light string 12 is electrically connected between the positive output end and the negative output end of the power module 11 , and each LED light string 12 includes a plurality of light emitting diodes (LEDs) connected in series. Each LED light string 12 has a first node n ₁ .

The sensing module 13 is electrically connected to the first node n1 of the at least _one LED light string 12 and the ground terminal, so as to receive the terminal voltage of the first node n1, and use the terminal voltage of the _first node n1 as the terminal voltage. The operating voltage of the sensing module 13 , the sensing module 13 correspondingly generates at least one sensing signal according to the sensed environment state, and outputs the at least one sensing signal.

The control signal generating module 14 is electrically connected to the first node n1 of the at least _one LED lamp string 12 and the ground terminal, so as to receive the terminal voltage of the _first node n1, and to use the terminal voltage of the _first node n1 As the operating voltage of the control signal generating module 14, the control signal generating module 14 is electrically connected to the sensing module 13 to receive the at least one sensing signal, generate a control signal according to the at least one sensing signal, and output the control signal.

The dimmer switch module 15 is electrically connected between the positive output terminal and the negative output terminal of the power supply module 11 to be connected in parallel with the at least one LED light string 12, and is electrically connected to the control signal generating module 14 to receive the control signal. signal, and control the conduction between the positive output terminal and the negative output terminal of the power module 11 according to the control signal.

The LED lamp 10 with automatic dimming function of the present invention itself has an automatic dimming function, can sense the environmental state through the sensing module 13, and generate the sensing signal, and pass the control signal generating module 14 according to the sensing The signal generates the control signal to control the dimming switch module 15 , thereby dimming the at least one LED light string 12 . And the sensing module 13 and the control signal generating module 14 are electrically connected to the first node n1 of the at least _one LED lamp string 12 and the ground terminal to receive the operating voltage, therefore, the at least one LED lamp string 12 has the original In addition to the function of light emission, through the characteristics of the forward bias of the diode, the LEDs in the at least one LED light string 12 can be further used to divide the voltage, so as to provide a suitable working voltage to the sensing module 13 and the control signal generating module 14, allowing the sensing module 13 and the control signal generating module 14 to directly obtain a working voltage of a suitable voltage through the at least one LED light string 12, without setting another power converter to convert the power supply 30, which can further save cost of production.

Therefore, the user only needs to directly install the LED lamp 10 with automatic dimming function of the present invention on the original lamp holder to have the automatic dimming function and achieve the effect of saving electric energy. At the same time, the installation is quite convenient. It helps to increase the user's willingness to change.

In addition, the dimmer switch module 15 in the present invention is connected in parallel with the at least one LED lamp string 12, and the dimming control is performed by bypass conduction, that is to say, when the dimmer switch module 15 is turned on, The current will directly pass through the dimmer switch module 15, and will not flow through the at least one LED light string 12, so that the at least one LED light string 12 is temporarily turned off to stop emitting light. At the same time, although the at least one LED light string 12 is temporarily turned off There is current flowing, so that the sensing module 13 and the control signal generating module 14 cannot receive the working voltage temporarily, but generally speaking, the sensing module 13 and the control signal generating module 14 will be provided with capacitors, so temporarily Temporarily stopping the power supply will not affect the normal operation, and when the dimmer switch module 15 is disconnected, the current will flow through the at least one LED light string 12, so that the at least one LED light string 12 starts to start glow. Therefore, the present invention controls the on and off of the dimmer switch module 15 and controls the lighting time of the at least one LED light string 12 to adjust the brightness. The human eye cannot detect it, so it will not affect the user's use. In this way, the dimming function can be achieved.

In addition, because a ballast used to drive the fluorescent lamp is installed in the lamp socket for installing the LED lamp 10 with automatic dimming function, the way the ballast drives the fluorescent lamp is to generate high voltage to drive the fluorescent lamp when there is no current to the fluorescent lamp Generate electricity to emit light. Therefore, if a switch is provided in the at least one LED light string 12 to adjust the brightness, when the switch is turned off, the current will stop, causing the ballast to start to generate high voltage, and then cause the at least one LED light string 12 or the switch to be damaged.

Therefore, the present invention adopts the conduction mode of the bypass, when the at least one LED lamp string 12 starts to emit light, the current passes through the at least one LED lamp string 12, and when the at least one LED lamp string 12 is turned off to stop emitting light, the current can through the dimmer switch module 15 . In this way, the ballast is prevented from starting due to the current stop, so that the ballast will not generate high voltage and damage the dimmer switch module 15 , so as to protect the dimmer switch module 15 and prolong the service life of the dimmer switch module 15 .

In this preferred embodiment, the dimming switch module 15 is a metal oxide semiconductor field effect transistor (MOSFET), and the drain (Drain) and source (Source) of the MOSFET are electrically connected to the power module 11 Between the positive output terminal and the negative output terminal, the gate of the MOSFET is electrically connected to the control signal generating module to receive the control signal. In this preferred embodiment, the MOSFET is an N-type metal oxide semiconductor field effect transistor, so when the control signal is a high voltage, the dimming switch module 15 is turned on, so that the at least one LED light string 12 Temporarily turn off to stop emitting light, and when the control signal is a low voltage, the dimmer switch module 15 is turned off, so that the at least one LED lamp string 12 starts to start emitting light.

Please refer to FIG. 2, in another preferred embodiment of the present invention, further, the LED lamp 10 with automatic dimming function also includes a voltage stabilizing module 16, the voltage stabilizing module 16 is electrically connected to the at least The first node n ₁ of an LED lamp string 12 is used to receive and stabilize the working voltage provided by the at least one LED lamp string 12, and is electrically connected to the sensing module 13 and the control signal generating module 14 to output the stabilized The working voltage is supplied to the sensing module 13 and the control signal generating module 14 . In this preferred embodiment, the terminal voltage of the first node n ₁ of the at least one LED light string 12 is a first voltage V ₁ .

Please also refer to FIG. 3 . In this preferred embodiment, the voltage stabilizing module 16 includes a diode D, a capacitor C and a low dropout linear regulator (LDO) 161 .

The anode of the diode D is electrically connected to the first node n ₁ of the at least one LED light string 12 to receive the first voltage V ₁ and convert the first voltage V ₁ into a first power supply voltage V _CC , which is obtained by The cathode of the diode D outputs the first power supply voltage V _CC to the sensing module 13 and the control signal generating module 14 .

One end of the capacitor C is electrically connected to the cathode of the diode D, and the other end of the capacitor C is electrically connected to the ground.

The two input terminals of the low dropout linear regulator 161 are respectively connected to both ends of the capacitor C, and an output terminal of the low dropout linear regulator 161 outputs a second power supply voltage _Vdd to the sensing module 13 and The control signal generation module 14 .

Please refer to FIG. 4, in yet another preferred embodiment of the present invention, the at least one LED lamp string 12 further has a second node n ₂ , wherein the LEDs connected in series between the first node n ₁ and the ground terminal The number is a first number, and the number of LEDs connected in series between the second node _n2 and the ground terminal is a second number, and the second number is smaller than the first number. The terminal voltage of the first node n ₁ is the first voltage V ₁ , and the terminal voltage of the second node n ₂ is the second voltage V ₂ .

Please also refer to FIG. 5. In this preferred embodiment, the voltage stabilizing module 16 is a voltage stabilizing circuit, including a first diode D ₁ , a second diode D ₂ , a first Capacitor C ₁ and a second capacitor C ₂ . The anode of the first diode D ₁ is electrically connected to the first node n ₁ to receive the first voltage V ₁ and convert the first voltage V ₁ into a first supply voltage V _CC , and the first two The cathode of the diode D ₁ outputs the first power supply voltage V _CC to the sensing module 13 and the control signal generating module 14 . The first capacitor C ₁ is electrically connected between the cathode of the first diode D ₁ and the ground to stabilize the first power supply voltage V _CC . The anode of the second diode D ₂ is electrically connected to the second node n ₂ to receive the second voltage V ₂ and convert the second voltage V ₂ into a second power supply voltage V _dd , and the second voltage V dd is generated by the second node n 2 . The cathodes of the two diodes D ₂ output the second power supply voltage V _dd to the sensing module 13 and the control signal generating module 14 . And the _second capacitor C2 is electrically connected between the cathode of the _second diode D2 and the ground terminal to stabilize the second power supply voltage Vdd. In this preferred embodiment, the voltage value of the first power voltage V _CC is greater than the voltage value of the second power voltage V _dd .

As shown in FIG. 4 , the sensing module 13 includes an object sensing unit 131 and a light source sensing unit 132 . The object sensing unit 131 is electrically connected to the voltage stabilizing module 16 to receive the first power supply voltage V _CC or is directly electrically connected to the first node n ₁ to receive the first voltage V ₁ , and is used for sensing Whether there is an object moving, and generate an object sensing signal V _object when the object is moving, and output the object sensing signal V _object to the control signal generating module 14 .

When the control signal generating module 14 receives the object sensing signal V _object , the control signal generating module 14 controls the dimmer switch module 15 to turn off according to the control signal, so that the at least one LED light string 12 starts to emit light. And when the control signal generating module 14 does not receive the object sensing signal V _object , the control signal generating module 14 controls the dimming switch module 15 to turn on according to the control signal, so that the at least one LED light string 12 is temporarily turned off Stop glowing. Because when the object sensing unit 131 generates the object sensing signal V _object , it represents that there is an object moving within the specific range, that is, there is a user moving in the specific space, so it is controlled by the control signal generation module 14 The at least one LED light string 12 starts to emit light to provide a light source for users in the specific space.

In this preferred embodiment, the object sensing unit 131 is a microwave radar sensing unit or a passive infrared sensor (Passive Infrared Sensor) sensing module.

The light source sensing unit 132 is electrically connected to the voltage stabilizing module 16 to receive the second power supply voltage V _dd or is directly electrically connected to the second node n ₂ to receive the second voltage V ₂ , and is used for sensing an environment brightness, and generate a brightness sensing signal V _light according to the ambient brightness, and output the brightness sensing signal V _light to the control signal generation module 14 .

Please refer to FIG. 4 and FIG. 6 together, the light source sensing unit 132 includes a photoresistor 1321 and a fixed resistor 1322 connected in series, one end of the photoresistor 1321 receives the second power supply voltage V _dd , and the The other end of the photoresistor 1321 is electrically connected to the ground terminal through the fixed resistor 1322 , and the series connection of the photoresistor 1321 and the fixed resistor 1322 outputs the brightness sensing signal V _light to the control signal generating module 14 .

The photoresistor 1321 is used to sense the ambient brightness. When the ambient brightness is brighter, the resistance value of the photoresistor 1321 is lower. And when the ambient brightness is darker, the resistance value of the photoresistor 1321 is higher. And because the brightness sensing signal V _light is a divided voltage formed by the photoresistor 1321 and the fixed resistor 1322, when the ambient brightness is brighter, the resistance value of the photoresistor 1321 is lower, and the brightness sensing signal V _light is lower. The higher the voltage value is; and when the ambient brightness is darker, the higher the resistance value of the photoresistor 1321 is, the lower the voltage value of the brightness sensing signal V _light is.

4 and 7, the control signal generation module 14 includes a conversion unit 141, a storage unit 142, a micro control unit 143, a comparison unit 144, a signal generation unit 145 and a buffer unit 146 .

The conversion unit 141 is electrically connected to the light source sensing unit 132 to receive the brightness sensing signal V _light , convert the brightness sensing signal V _light , and output the converted brightness sensing signal V _light . In this preferred embodiment, the converting unit 141 is an analog-to-digital converter (ADC) for converting the brightness sensing signal V _light from an analog signal to a digital signal.

The storage unit 142 stores at least a first voltage threshold V _t1 . The microcontroller unit 143 is electrically connected to the storage unit 142 to read the at least one first voltage threshold V _t1 and output the at least one first voltage threshold V _t1 . The comparison unit 144 is electrically connected to the conversion unit 141 and the micro control unit 143 to receive the converted brightness sensing signal V _light output by the conversion unit 141 and at least a first voltage threshold output by the micro control unit 143 V _t1 . And the comparison unit 141 compares the converted brightness sensing signal V _light with the at least one first voltage threshold V _t1 , generates an adjustment signal according to the comparison result, and outputs the adjustment signal. The signal generation unit 145 is electrically connected to the comparison unit 144 to receive the adjustment signal, generate the control signal V _ctrl according to the adjustment signal, and output the control signal V _ctrl . The buffer unit 146 is electrically connected to the signal generating unit 145 to receive the control signal V _ctrl and output the control signal V _ctrl to the dimming switch module 15 . In this preferred embodiment, the control signal is a pulse width modulation (PWM) signal.

In this way, the LED lamp 10 with automatic dimming function can sense the ambient light through the light source sensing unit 132, and automatically adjust the brightness of the at least one LED light string 12 according to the ambient light, so as to automatically provide users with a comfortable brightness. Let the user use it.

For example, since the resistance value of the photoresistor 1321 is lower when the ambient brightness is brighter, the voltage value of the brightness sensing signal V _light is higher; and when the ambient brightness is darker, the resistance value of the photoresistor 1321 The higher the value, the lower the voltage value of the brightness sensing signal V _light .

Therefore, the comparison unit 144 compares the voltage value of the converted brightness sensing signal V _light with the at least one first voltage threshold V _t1 , when the converted voltage value of the brightness sensing signal V _light is greater than the When there is at least a first voltage threshold V _t1 , it means that the current ambient brightness is too bright, and the signal generating unit 145 increases the duty cycle (Duty cycle) of the control signal V _ctrl according to the adjustment signal, so that the at least one LED lamp string 12 emits light The time is reduced so as to reduce the brightness of the at least one LED light string 12 to achieve the purpose of adjusting the ambient brightness.

And when the voltage value of the converted brightness sensing signal V _light is less than the at least one first voltage threshold V _t1 , it means that the current ambient brightness is too dark, and the signal generation unit 145 reduces the control signal V _ctrl according to the adjustment signal. The duty cycle (Duty cycle) of the at least one LED lamp string 12 is increased to increase the brightness of the at least one LED lamp string 12 to achieve the purpose of adjusting the ambient brightness.

Further, the signal generating unit 145 is further electrically connected to the object sensing unit 131 to receive the object sensing signal V _object , and when the signal generating unit 145 receives the object sensing signal V _object , it outputs the The control signal V _ctrl is sent to the buffer unit 146 , and when the signal generating unit 145 does not receive the object sensing signal V _object , the control signal V _ctrl is not output to the buffer unit 146 .

The buffer unit 146 is electrically connected to the voltage stabilizing module 16 to receive the first power supply voltage V _CC , and adjusts the peak voltage of the control signal V _ctrl according to the first power supply voltage V _CC , so as to turn the switching module 15 on and off. good control.

When the object sensing unit 131 generates the object sensing signal V _object , it means that there is a user moving within the specific range. At this time, it is necessary to turn on the LED lamp 10 with automatic dimming function to allow the automatic dimming function. The functional LED lamp 10 automatically adjusts the brightness of the environment for users to use. And when the object sensing unit 131 does not generate the object sensing signal V _object , it means that there is no user within the specific range, at this time, the LED lamp 10 with automatic dimming function is turned off, so that the automatic dimming function The light function of the LED lamp 10 suspends the function of automatically adjusting the ambient brightness to save power.

Furthermore, when the signal generating unit 145 does not receive the object sensing signal V _object , the signal generating unit 145 can also output a standby signal and send it to the dimmer switch module 15 through the buffer unit 146, so that the at least An LED light string 12 maintains a standby brightness.

In addition, the storage unit 142 further stores at least a second voltage threshold V _t2 . The microcontroller unit 143 reads the at least one first voltage threshold V _t1 and the at least one second voltage threshold V _t2 , and outputs the at least one first voltage threshold V _t1 and the at least one second voltage threshold V _t2 to the comparison unit 144 . The comparison unit 141 compares the voltage value of the converted brightness sensing signal V _light with the at least one first voltage threshold V _t1 and the at least one second voltage threshold V _t2 , and generates the adjusting the signal, and outputting the adjusting signal. Wherein the at least one first voltage threshold V _t1 is greater than the at least one second voltage threshold V _t2 .

When the voltage value of the converted brightness sensing signal V _light is greater than the at least one first voltage threshold V _t1 , it means that the current ambient brightness is too bright, and the signal generation unit 145 increases the duty of the control signal V _ctrl according to the adjustment signal. The duty cycle is to reduce the light-emitting time of the at least one LED light string 12 to reduce the brightness of the at least one LED light string 12 .

And when the voltage value of the converted brightness sensing signal V _light is less than the at least one second voltage threshold V _t2 , it means that the current ambient brightness is too dark, and the signal generation unit 145 reduces the control signal V _ctrl according to the adjustment signal. The duty cycle (Duty cycle) of the at least one LED light string 12 is increased to reduce the brightness of the at least one LED light string 12 .

In this way, the comparison unit 141 compares the voltage value of the converted brightness sensing signal V _light with the at least one first voltage threshold V _t1 and the at least one second voltage threshold V _t2 to adjust When the brightness of the at least one LED light string 12 is automatically adjusted, there is a buffer area for judgment, so as to avoid flickering caused by too frequent changes in the brightness during the adjustment process, which will affect users.

Furthermore, the micro control unit 143 of the control signal generating module 14 is electrically connected to the voltage stabilizing module 16 to receive the first power supply voltage V _CC . The storage unit 142 stores a plurality of first voltage thresholds V _t1 . Because when the power switch 20 is turned off, the first power supply voltage V _CC will become 0 voltage because there is no power input, so the micro-control unit 143 can further judge the switching of the power switch 20 according to the first power supply voltage V _CC state. When the micro control unit 143 determines that the power switch 20 is turned off and turned on within a first time, the micro control unit 143 reads and outputs another first voltage threshold V _t1 in the storage unit 142 . When the micro control unit 143 judges that the power switch 20 is turned off and is turned on during the first time to a second time, the micro control unit 143 reads and outputs the initial first voltage threshold V in the storage unit 142 _t1 . When the micro-control unit 143 determines that the power switch 20 is turned off and turned on after the second time, the micro-control unit 143 reads and outputs the previous first voltage threshold V _t1 in the storage unit 142 .

The LED lamp 10 with automatic dimming function will adjust the brightness of the at least one LED unit 12 according to the currently read first voltage threshold V _t1 and the current ambient brightness when the power switch 20 is turned on, so that the overall The ambient brightness reaches a target ambient brightness. That is to say, the user can adjust the first voltage threshold V _t1 read by the micro control unit 143 through the power switch 20, that is, the target ambient brightness of the LED lamp 10 with automatic dimming function can allow the user to adjust The power switch 20 to adjust. This provides users with more diverse usage methods.

The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this professional technology Personnel, without departing from the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make some changes or modifications to equivalent embodiments with equivalent changes, but any content that does not depart from the technical solution of the present invention, according to this Technical Essence of the Invention Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solutions of the present invention.

Claims (12)

1. A light-emitting diode lamp with automatic dimming function, characterized in that it comprises: A power module has two power input terminals, a positive output terminal and a negative output terminal; wherein the two power input terminals of the power module are electrically connected to a power supply through a power switch, and the negative output terminal of the power module is a ground terminal; At least one light-emitting diode string is electrically connected between the positive output terminal and the negative output terminal of the power module, and includes a plurality of light-emitting diodes connected in series; wherein the at least one LED light string has a first node; A sensing module, electrically connected to the first node of the at least one LED lamp string and the ground terminal, to receive the operating voltage, and to correspond to at least one sensing signal according to the sensed environmental state, and output the at least one sensing signal Signal; A control signal generation module, electrically connected to the first node of the at least one LED light string and the ground terminal, to receive the working voltage, and electrically connected to the sensing module, to receive the at least one sensing signal, and according to the at least one The sensing signal generates a control signal, and outputs the control signal; A dimming switch module, electrically connected between the positive output terminal and the negative output terminal of the power supply module, so as to be connected in parallel with the at least one LED lamp series, and electrically connected to the control signal generating module, so as to receive the control signal and perform The control signal controls whether the connection between the positive output terminal and the negative output terminal of the power module is conducted. 2. The light-emitting diode lamp with automatic dimming function as claimed in claim 1, further comprising: A voltage stabilizing module, electrically connected to the first node of the at least one LED light string, to receive and stabilize the working voltage provided by the at least one LED light string, and electrically connected to the sensing module and the control signal generating module, to The stabilized working voltage is output to the sensing module and the control signal generating module. 3. The light-emitting diode lamp with automatic dimming function as claimed in claim 2, wherein the terminal voltage of the first node of the at least one LED lamp string is a first voltage, and the voltage stabilizing module includes: A diode, the anode of which is electrically connected to the first node of the at least one LED light string to receive the first voltage and convert the first voltage into a first power supply voltage, and output the first power supply from the cathode of the diode voltage to the sensing module and the control signal generating module; a capacitor with one end electrically connected to the cathode of the diode and the other end electrically connected to the ground terminal; and A low-dropout linear regulator, its two input ends are respectively connected to the two ends of the capacitor, and its one output end outputs a second power supply voltage to the sensing module and the control signal generating module. 4. The light-emitting diode lamp with automatic dimming function as claimed in claim 2, characterized in that: The at least one LED light string further has a second node, the number of LEDs connected in series between the first node and the ground terminal is a first number, and the number of LEDs connected in series between the second node and the ground terminal is a a second amount that is less than the first amount; The terminal voltage of the first node is a first voltage, and the terminal voltage of the second node is a second voltage; The voltage stabilizing module, a voltage stabilizing circuit, includes: a first diode, the anode of which is electrically connected to the first node to receive the first voltage and convert the first voltage into a first power supply voltage, and output the first power supply from the cathode of the first diode voltage to the sensing module and the control signal generating module; a first capacitor electrically connected between the cathode of the first diode and the ground terminal to stabilize the first power supply voltage; A second diode, the anode of which is electrically connected to the second node to receive the second voltage and convert the second voltage into a second power supply voltage, and output the first voltage from the cathode of the second diode two power supply voltages to the sensing module and the control signal generating module; and a second capacitor electrically connected between the cathode of the second diode and the ground terminal to stabilize the second power supply voltage; The voltage value of the first power supply voltage is greater than the voltage value of the second power supply voltage. 5. The light-emitting diode lamp with automatic dimming function as claimed in claim 3 or 4, wherein the sensing module includes: an object sensing unit, electrically connected to the voltage stabilizing module, to receive the first power supply voltage, and used for sensing whether there is an object moving within a certain range, and generating an object sensing signal when the object moves, and Outputting the object sensing signal to the control signal generating module; When the control signal generating module receives the object sensing signal, the control signal generating module controls the dimmer switch module to turn off according to the control signal; when the control signal generating module does not receive the object sensing signal, The control signal generating module controls the dimming switch module to conduct according to the control signal. 6. The light-emitting diode lamp with automatic dimming function as claimed in claim 3 or 4, wherein the sensing module includes: A light source sensing unit, electrically connected to the voltage stabilizing module, to receive the second power supply voltage, and used to sense an ambient brightness, generate a brightness sensing signal according to the ambient brightness, and output the brightness sensing signal to The control signal generation module. 7. The light-emitting diode lamp with automatic dimming function as claimed in claim 6, wherein the control signal generating module comprises: A conversion unit, electrically connected to the light source sensing unit, to receive the brightness sensing signal, convert the brightness sensing signal, and output the converted brightness sensing signal; a storage unit storing at least a first voltage threshold; A micro control unit, electrically connected to the storage unit to read the at least one first voltage threshold, and output the at least one first voltage threshold; A comparison unit electrically connected to the conversion unit and the micro control unit to receive the converted brightness sensing signal output by the conversion unit and at least a first voltage threshold output by the micro control unit, and the comparison unit compares the Converting the brightness sensing signal and the at least one first voltage threshold, generating an adjustment signal according to the comparison result, and outputting the adjustment signal; a signal generation unit, electrically connected to the comparison unit, to receive the adjustment signal, generate the control signal according to the adjustment signal, and output the control signal; and A buffer unit is electrically connected to the signal generating unit to receive the control signal and output the control signal to the dimming switch module. 8. The light-emitting diode lamp with automatic dimming function as claimed in claim 7, characterized in that: The light source sensing unit includes a photoresistor and a fixed resistor connected in series, one end of the photoresistor receives the second power supply voltage, and the other end of the photoresistor is electrically connected to the ground terminal through the fixed resistor, and the The series connection of the photoresistor and the fixed resistor outputs the brightness sensing signal; When the ambient brightness is brighter, the resistance value of the photoresistor is lower; When the ambient brightness is darker, the resistance value of the photoresistor is higher; The control signal is a pulse width modulation signal; The comparing unit compares the voltage value of the converted brightness sensing signal with the magnitude of the at least one first voltage threshold; When the voltage value of the converted brightness sensing signal is greater than the at least one first voltage threshold, the signal generating unit increases the duty ratio of the control signal according to the adjustment signal; When the voltage value of the converted brightness sensing signal is less than the at least one first voltage threshold, the signal generating unit reduces the duty cycle of the control signal according to the adjustment signal. 9. The light-emitting diode lamp with automatic dimming function as claimed in claim 7, characterized in that: The light source sensing unit includes a photoresistor and a fixed resistor connected in series, one end of the photoresistor receives the second power supply voltage, and the other end of the photoresistor is electrically connected to the ground terminal through the fixed resistor, and the The series connection of the photoresistor and the fixed resistor outputs the brightness sensing signal; When the ambient brightness is brighter, the resistance value of the photoresistor is lower; When the ambient brightness is darker, the resistance value of the photoresistor is higher; The control signal is a pulse width modulation signal; The storage unit further stores at least a second voltage threshold; The micro control unit reads the at least one first voltage threshold and the at least one second voltage threshold, and outputs the at least one first voltage threshold and the at least one second voltage threshold to the comparison unit; The comparison unit compares the voltage value of the converted brightness sensing signal with the at least one first voltage threshold and the at least one second voltage threshold, generates the adjustment signal according to the comparison result, and outputs the adjustment signal ; The at least one first voltage threshold is greater than the at least one second voltage threshold; When the voltage value of the converted brightness sensing signal is greater than the at least one first voltage threshold, the signal generating unit increases the duty ratio of the control signal according to the adjustment signal; When the voltage value of the converted brightness sensing signal is less than the at least one second voltage threshold, the signal generating unit reduces the duty ratio of the control signal according to the adjustment signal. 10. The light-emitting diode lamp with automatic dimming function as claimed in claim 7, wherein the sensing module comprises: An object sensing unit is electrically connected to the voltage stabilizing module to receive the first power supply voltage, and is used to sense whether there is an object moving within a specific range, and when the object moves, an object sensing signal is generated and output to The control signal generating module; Wherein the signal generating unit of the control signal generating module is further electrically connected to the object sensing unit to receive the object sensing signal, and when the signal generating unit receives the object sensing signal, outputs the control signal to the dimmer switch module, and when the signal generating unit does not receive the object sensing signal, it does not output the control signal to the dimmer switch module. 11. The light-emitting diode lamp with automatic dimming function as claimed in claim 7, wherein the sensing module comprises: An object sensing unit is electrically connected to the voltage stabilizing module to receive the first power supply voltage, and is used to sense whether there is an object moving within a specific range, and when the object moves, an object sensing signal is generated and output to The control signal generating module; Wherein the signal generating unit of the control signal generating module is further electrically connected to the object sensing unit to receive the object sensing signal, and when the signal generating unit receives the object sensing signal, outputs the control signal to the dimmer switch module, and when the signal generating unit does not receive the object sensing signal, it outputs a standby signal to the dimming switch module, so that the at least one LED light string maintains a standby brightness. 12. The light-emitting diode lamp with automatic dimming function as claimed in claim 7, characterized in that: The micro control unit of the control signal generating module is electrically connected to the voltage stabilizing module to receive the first power supply voltage; The storage unit stores a plurality of first voltage thresholds; The micro control unit further judges the switching state of the power switch according to the first power supply voltage; When the micro control unit determines that the power switch is turned off and is turned on within a first time, the micro control unit reads and outputs another first voltage threshold in the storage unit; When the micro control unit determines that the power switch is turned off and is turned on during the first time to a second time, the micro control unit reads and outputs the initial first voltage threshold in the storage unit; When the microcontroller unit judges that the power switch is turned off and turned on after a second time, the microcontroller unit reads and outputs the previous first voltage threshold in the storage unit.