TW202011776A - LED lamp brightness control structure capable of simplifying the wiring between the sensing switch and the LED control devices and reducing the manufacture cost - Google Patents

Abstract

An LED lamp brightness control structure includes a sensing switch and at least one LED control device. A transimpedance amplification unit converts a current signal into a voltage signal, and converts the voltage signal into a square wave signal in cooperation with a Schmitt circuit, so that the sensing switch can be connected to a plurality of LED control devices via a single wire so as to achieve the function of simultaneously controlling a plurality of LED lamps. The sensing switch is independently disposed at a position to be sensed. Therefore, only the wire has to be disposed between the sensing switch and the LED control devices. With the single wire, it is able to perform wiring more easily on the plurality of LED control devices connected in parallel, and also greatly reduce the amount of wires used, thereby simplifying the wiring between the sensing switch and the LED control devices and reducing the manufacture cost.

Description

LED lamp brightness control structure

The invention relates to an LED control device, in particular to an LED lamp brightness control structure which has easy wiring and can reduce construction cost.

According to a conventionally known LED lamp brightness control structure, as shown in FIG. 3, it includes a sensing switch 301, a plurality of LED drivers 302, and a plurality of LED lamps 303. The sensing switch 301 uses two wires (304) ( 305) Connect the LED driver 302, and the LED lamp 303 is directly fixed to the LED driver 302, that is, the LED driver 302 and the LED lamp 303 have an integral structure, and the sensor uses a relay as an ON/OFF operating part, In this way, when there is a dynamic change in the sensing range, the voltage signal is transmitted to the LED driver 302 through the wire (303) (304), so that the LED driver 302 controls the timing and brightness of the LED lamp 303, In order to achieve the purpose of controlling the LED lamp 303, it is not difficult to find out that the conventional structure has some shortcomings. The main reason is as follows: in use, the sensing switch 301 needs to connect a plurality of LEDs at the same time. The driver 302 and the LED lamp 303, and the installation position of the sensing switch 301 is at a considerable distance from the above-mentioned required lighting position, so there is a need for wiring of the two wires (304) (305). The greater the number, the greater the difficulty of the wires (304) (305) in wiring, and the use of the wire is greatly increased, making the conventional voltage-sensing method difficult to wire and build. The shortcoming of being too high, and the sensing switch 301 of the voltage sensing method will be limited by the wattage of the LED driver 302, too much connection of the LED lamp 303 will produce a significant voltage drop, so that the sensing switch 301 is connected at the same time The number of the LED lamps 303 is limited, and they cannot be flexibly configured and used.

In view of this, the inventor has been engaged in the manufacturing development and design of related products for many years. In view of the above objectives, after detailed design and careful evaluation, the inventor finally has a practical invention.

The technical problem to be solved by the present invention is to provide an LED lamp brightness control structure in view of the above-mentioned defects in the prior art.

A sensing switch is used for sensing environmental changes to generate a current signal, and the current signal forms an output through a wire, at least one LED control device, the LED control device includes a current rectification unit, a current limiting unit, a transimpedance amplifier Unit, a voltage divider circuit unit and a Schmitt circuit unit, the current rectifying unit connects the wire of the sensing switch with the anode of a diode, and rectifies the current signal with the diode, the limit The current unit includes a first resistor and a second resistor connected in series with each other, the input terminal of the first resistor is connected to the cathode of the diode, and the current limiting unit forms the current limit of the current signal, and the transimpedance is amplified The unit includes an optical output coupler, an optical receiving coupler, and a voltage amplifier. One end of the optical output coupler is connected to the output end of the second resistor, and the other end of the optical output coupler is grounded to allow the current signal An optical signal is generated through the optical output coupler, and the emitter of the optical receiving coupler is connected to the non-inverting terminal of the voltage amplifier, and the collector of the optical receiving coupler is connected to the inverting terminal of the voltage amplifier, and is received by the light The base of the coupler receives the optical signal to generate a voltage signal corresponding to the current signal, and the output terminal of the voltage amplifier is connected to the voltage divider circuit unit to allow the voltage signal to be amplified by the signal of the voltage amplifier It then flows through the voltage-dividing circuit unit to divide the voltage. The non-inverting end of the pivotal circuit unit is connected to the voltage-dividing circuit unit, and the pivotal circuit unit receives the voltage signal to generate lights with turning on and off ( ON/OFF) square wave signal, and the square wave signal is output from the output terminal of the Schmitt circuit unit to achieve the control purpose.

Wherein, the transimpedance amplifier further includes a third resistor, a filter, a protector, a fourth resistor and a capacitor, the optical output coupler is connected to the second resistor through the third resistor, and the filter One end connected in parallel with the protector is connected between the third resistor and the second resistor, and the other end connected in parallel with each other is connected to the grounded end of the optical output coupler, and the fourth resistor and the capacitor One end connected in parallel to each other is connected between the light receiving coupler and the inverting terminal of the voltage amplifier, and the other end connected in parallel is connected between the output end of the light receiving coupler and the input end of the voltage dividing circuit unit .

Wherein, the voltage dividing circuit unit includes a fifth resistor and a sixth resistor, the fifth resistor and the sixth resistor are connected in series with each other, and the input terminal of the fifth resistor is connected to the output terminal of the light receiving coupler, and The fifth resistor and the sixth resistor are connected to the in-phase terminal of the Schmitt circuit unit.

Wherein, the LED control device further includes a microcontroller and a function setting unit, the microcontroller is connected to the output terminal of the light receiving coupler, and the function setting unit is connected to the sixth resistance output terminal and the microcontroller The sixth resistor, the microcontroller and the function setting unit form a common ground, and the function setting unit can be manually set, thereby controlling the microcontroller to perform the set after receiving the square wave signal Lighting mode.

Wherein, the LED control device further includes a reference power unit, the reference power unit forms a first terminal, a second terminal and a third terminal, the first terminal is used to input a DC voltage, and the first The two terminals are used for grounding, and the third terminal of the reference power unit is connected to the voltage amplifier, the Schmitt circuit unit, and the microcontroller, and the third terminal outputs a low-voltage control DC power supply.

Wherein, the reference power supply unit is a low dropout linear regulator (Low Dropout Regulator, LDO).

Wherein, the LED control device further includes an LED drive control unit, one end of the LED drive control unit is connected to the output end of the microcontroller, and the other end of the LED drive control unit is connected to an LED lamp, which is driven by the LED drive control unit The LED lamp performs lighting and brightness adjustment control, and the brightness adjustment control of the LED driving control unit can form a stepless gradual brightening or dimming brightening change.

Wherein, the LED control device further includes a rectifier unit and a power supply unit, the rectifier unit is connected to an external power supply and the rectified output is connected to the power supply unit and the LED drive control unit, and the rectifier unit provides power to the LED lamp In use, the power supply unit is connected to the reference power unit, and the power is supplied to the reference power unit after stepping down the voltage through the power supply unit.

Wherein, the rectifier unit includes an inductor and a full-wave rectifier, the inductor is connected to an external power supply and the full-wave rectifier, and the rectifier unit connects the power supply unit and the LED drive control unit through the full-wave rectifier.

Wherein, the power supply unit includes a transistor, a seventh resistor, an eighth resistor, a filter capacitor and a protection diode, the collector of the transistor is connected to the seventh resistor, and is connected by the seventh resistor The rectifier unit, the base of the transistor is connected to the protective diode and forms a ground, and the emitter of the transistor is connected to the filter capacitor and forms a ground, and the emitter of the transistor is connected to the eighth resistor at the same time, The eighth resistor is connected to the first terminal of the reference power supply unit.

The main purpose of the present invention is to convert the current signal into the voltage signal by the transimpedance amplifying unit, and cooperate with the Schmitt circuit to convert the voltage signal into the square wave signal, so that the sensing switch can be single The lead is connected to a plurality of the LED control devices, which can achieve the function of controlling a plurality of the LED lights at the same time. Since the LED control device is assembled as an integral electronic component, the sensing switch will be independently set to be sensed Position, so only the wire needs to be wired between the sensing switch and the LED control device, and the single wire can make it easier for multiple LED control devices connected in parallel to be wired, and can also greatly reduce the use of wires In order to have the practical function of easy wiring and reducing the construction cost between the sensing switch and the LED control device.

Other objects, advantages and novel features of the present invention will become more apparent from the following detailed description and related drawings.

〔This creation〕

100‧‧‧sensor switch

200‧‧‧LED control device

201‧‧‧Current Rectifier Unit

202‧‧‧Current limiting unit

203‧‧‧Transimpedance amplifier unit

204‧‧‧Voltage dividing circuit unit

205‧‧‧Primit circuit unit

206‧‧‧Microcontroller

207‧‧‧Function setting unit

208‧‧‧LED drive control unit

209‧‧‧Reference power unit

210‧‧‧LED light

211‧‧‧Rectifier unit

212‧‧‧Power supply unit

A1‧‧‧Current signal

C1‧‧‧filter

C2‧‧‧Capacitor

C3‧‧‧filter capacitor

D1‧‧‧Diode

D2‧‧‧Protector

D3‧‧‧Full Wave Rectifier

D4‧‧‧Protection diode

F1‧‧‧square wave signal

S1‧‧‧First endpoint

S2‧‧‧second endpoint

S3‧‧‧The third endpoint

L1‧‧‧wire

L2‧‧‧Inductor

OC1‧‧‧Optical output coupler

OC2‧‧‧ optical receiver coupler

Q1‧‧‧Voltage amplifier

Q2‧‧‧transistor

R1‧‧‧ First resistance

R2‧‧‧Second resistance

R3‧‧‧ Third resistance

R4‧‧‧ Fourth resistance

R5‧‧‧ fifth resistance

R6‧‧‧Sixth resistance

R7‧‧‧The seventh resistor

R8‧‧‧Eighth resistor

V1‧‧‧Voltage signal

〔Knowledge〕

301‧‧‧sensor switch

302‧‧‧LED driver

303‧‧‧LED light

(304)(305)‧‧‧Wire

Figure 1 is a block diagram of the present invention.

Figure 2 is a circuit diagram of the present invention.

Figure 3 is a block diagram of conventional knowledge.

In order to enable your reviewing committee to have a better understanding and understanding of the purpose, features and effects of the present invention, the following is please cooperate with the [schematic description] detailed description as follows: first please look at the views shown in Figure 1 and Figure 2 An LED lamp brightness control structure includes: a sensing switch 100 and at least one LED control device 200. A sensing switch 100 is used to sense environmental changes and generate a current signal A1, and the current signal A1 passes through a The wire L1 forms an output, and at least one LED control device 200 includes a current rectifying unit 201, a current limiting unit 202, a transimpedance amplifying unit 203, a voltage dividing circuit unit 204 and a pivoting circuit Unit 205, the current rectifying unit 201 connects the lead L1 of the sensing switch 100 with the anode of a diode D1, and rectifies the current signal A1 with the diode D1, and the current limiting unit 202 includes series connection with each other A first resistor R1 and a second resistor R2, the input terminal of the first resistor R1 is connected to the cathode of the diode D1, and the current limiting unit 202 forms the current limit of the current signal A1, and then controls the access to the The transimpedance amplifying unit 203 is a small current. The transimpedance amplifying unit 203 includes an optical output coupler OC1, an optical receiving coupler OC2, a voltage amplifier Q1, a third resistor R3, a filter C1, and a protector D2 , A fourth resistor R4 and a capacitor C2, one end of the optical output coupler OC1 is connected to the output end of the second resistor R2, and the optical output coupler OC1 is through the third resistor R3 and the second resistor R2 Connection, thereby effectively forming a current limit, and the other end of the optical output coupler OC1 is grounded, so that the current signal A1 generates an optical signal through the optical output coupler OC1, and the filter C1 and the protector D2 One end connected in parallel to each other is connected between the third resistor R3 and the second resistor R2, and the other end connected in parallel to the other end connected to the ground of the optical output coupler OC1, and the power signal is conducted through the filter C1 The filtering of A1 can form an over-current protection function with the protector D2, and the emitter of the light receiving coupler OC2 is connected to the non-inverting terminal of the voltage amplifier Q1, and the collector of the light receiving coupler OC2 is connected to the The inverting terminal of the voltage amplifier Q1 receives the optical signal from the base of the light receiving coupler OC2 to generate a voltage signal V1 corresponding to the current signal A1, and the output terminal of the voltage amplifier Q1 and the voltage divider circuit Unit 204 is connected, and the fourth resistor R4 and the capacitor C2 are connected in parallel with each other between the light receiving coupler OC2 and the inverting terminal of the voltage amplifier Q1, and the other end in parallel with each other is connected to the light receiving Between the output end of the coupler OC2 and the input end of the voltage dividing circuit unit 204, the voltage dividing circuit unit 204 includes a fifth resistor R5 and a sixth resistor R6, the fifth resistor R5 and the sixth resistor R6 are mutually connected Connected in series, and the input end of the fifth resistor R5 is connected to the light receiving coupler O The output terminal of C2, and the fifth resistor R5 and the sixth resistor R6 are connected to the non-inverting terminal of the Schmitt circuit unit 205, so that the voltage signal V1 is amplified by the signal of the voltage amplifier Q1 and then flows through The voltage-dividing circuit unit 204 divides the voltage, and then cuts off the voltage signal V1 whose amplitude is too large. The non-inverting end of the pivotal circuit unit 205 is connected to the voltage-dividing circuit unit 204, and the pivotal circuit unit 205 receives the voltage signal V1 and generates a square wave signal F1 with ON and OFF (ON/OFF), and the square wave signal F1 is output from the output terminal of the Schmitt circuit unit 205 to achieve the control purpose, by The transimpedance amplifying unit 203 converts the current signal A1 into the voltage signal V1, and cooperates with the Schmitt circuit 205 to convert the voltage signal V1 into the square wave signal F1, so that the sensing switch 100 can use a single wire L1 is connected to at least one of the LED control devices 200 so as to have a practical function of easy wiring between the sensing switch 100 and the LED control device 200.

From the perspective of Figures 1 and 2, the LED control device 200 further includes a microcontroller 206, a function setting unit 207, an LED drive control unit 208, and a reference power unit 209, the microcontroller 206 The output terminal of the light receiving coupler OC2 is connected, and the function setting unit 207 is connected between the output terminal of the sixth resistor R6 and the microcontroller 206, and the sixth resistor R6, the microcontroller 206 and the function setting The unit 207 is formed with a common ground, and the function setting unit 207 can be manually set, and its setting items include functions such as lighting time, lighting duration, or lighting illumination control, thereby controlling the microcontroller 206 to receive the After the square wave signal F1, the set lighting mode is performed. One end of the LED drive control unit 208 is connected to the output end of the microcontroller 206, and the other end of the LED drive control unit 208 is connected to an LED lamp 210, which is controlled by the LED drive The unit 208 drives the LED lamp 210 to perform lighting and adjust brightness control, and the adjustment brightness control of the LED drive control unit 208 can form a stepless gradual lightening or dimming light change. The reference power unit 209 is a low voltage A differential linear regulator (Low Dropout Regulator, LDO). The reference power unit 209 forms a first terminal S1, a second terminal S2, and a third terminal S3. The first terminal S1 is used to input DC Voltage, and the second terminal S2 is used for grounding, and the third terminal S3 of the reference power unit 209 is connected to the voltage amplifier Q1, the Schmitt circuit unit 205, and the microcontroller 206, and the voltage amplifier Q1 Both the Schmitt circuit unit 205 are formed with one end grounded, and the third terminal S3 outputs a low-voltage control DC power supply.

From the perspective of Figures 1 and 2, the LED control device 200 further includes a rectifier unit 211 and a power supply unit 212, the rectifier unit 211 is connected to an external power supply and the rectified output is connected to the power supply unit 212 and the The LED driving control unit 208 supplies power to the LED lamp 210 through the rectifying unit 211, and the power supply unit 212 is connected to the reference power unit 209, and the power is supplied to the reference power unit after stepping down through the power supply unit 212 209, the rectifying unit 211 includes an inductor L2 and a full-wave rectifier D3, the inductor L2 is connected to an external power supply and the full-wave rectifier D3, and the rectifying unit 211 is connected to the power supply unit 212 through the full-wave rectifier D3 The LED driving control unit 208 thereby forms a power supply. The power supply unit 212 includes a transistor Q2, a seventh resistor R7, an eighth resistor R8, a filter capacitor C3 and a protection diode D4. The collector of the crystal Q2 is connected to the seventh resistor R7, and the seventh resistor R7 is connected to the rectifier unit 211, and the base of the transistor Q2 is connected to the protective diode D4 and forms a ground, and the transistor Q2 The emitter is connected to the filter capacitor C3 and forms a ground, and the emitter of the transistor Q2 is simultaneously connected to the eighth resistor R8, and the eighth resistor R8 is connected to the first terminal S1 of the reference power unit 209.

For the actual use of the function, please see from Figure 1 and 2, the rectifier unit 211 uses the inductor L2 to input an external power supply (AC), and transforms the voltage through the inductor L2 to the full-wave rectifier D3, and then supply the rectified relatively high-voltage power to the power supply unit 212 and the LED drive control unit 208, and the relatively high-voltage power flows through the seventh resistor R7 of the power supply unit 212, the transistor Q2 and the eighth The resistor R8 will step down the voltage to form relatively low-voltage power, and let the relatively low-voltage power input to the first terminal S1 of the reference power unit 209, and after the reference power unit 209 undergoes another step-down, the third terminal S3 provides control power for the voltage amplifier Q1, the Schmitt circuit unit 205, and the microcontroller 206, and the relatively high-voltage power flowing to the LED drive control unit 208 can be used to light the LED lamp 210, and then To further illustrate the lighting and dimming control operation of the LED lamp 210, the sensing switch 100 is connected to an external power source, and when a dynamic change is detected within the sensing range, the sensing switch 100 will generate an Current signal A1, and the current signal A1 can flow into at least one current rectifying unit 201 of the LED control device 200 through the single wire L1 at the same time, first rectified through the diode D1 of the current rectifying unit 201, and then the limit The first resistor R1 and the second resistor R2 of the current unit 202 perform current limiting to reduce the current value of the current signal A1, and after the current signal A1 is input to the transimpedance amplifier unit 203, the third resistor R3 is used to form the limit again. Current, so that the current signal A1 can drive the optical output coupler OC1 to generate an optical signal, and the optical signal can increase according to the current rise of the current signal A1, and at the same time, the optical receiving coupler OC2 receives the optical signal and generates a corresponding voltage signal V1, and the voltage signal V1 can also increase as the optical signal rises, and the voltage signal V1 is input to the inverting terminal of the voltage amplifier Q1, the output terminal of the voltage amplifier Q1 can be used to form the voltage signal V1 Amplify and input the voltage divider circuit unit 204 through the voltage divider of the fifth resistor R5 and the sixth resistor R6, thereby filtering the excessively large voltage value that the mitt circuit unit 205 can clearly interpret. The voltage signal V1 is input to the non-inverting end of the Schmitt circuit unit 205 between the fifth resistor R5 and the sixth resistor R6, and the voltage signal V1 is interpreted to generate a corresponding square wave through the Schmitt circuit unit 205 Signal F1, and the Schmitt circuit unit 205 can further filter noise, so that the square wave signal F1 can be input into the microcontroller 206, and cooperate with the user-defined settings of the function setting unit 207, by The microcontroller 206 controls the LED driving control unit 208 so that the LED lamp 210 has the function of automatically turning on the light and adjusting the brightness according to the environment. With the structure of the above specific embodiment, the following benefits can be obtained: The resistance amplification unit 203 will The current signal A1 is converted into the voltage signal V1, and in cooperation with the Schmitt circuit 205, the voltage signal V1 is converted into the square wave signal F1, so that the sensing switch 100 can be connected to a plurality of LED controls with a single wire L1 The device 200 can achieve the function of controlling multiple LED lamps 210 at the same time. Since the LED control device 200 is assembled as a whole electronic component, the sensing switch 100 will be independently set at the position to be sensed. Therefore, only the wire L1 needs to be wired between the sensing switch 100 and the LED control device 200, and the single wire L1 makes it easier to wire a plurality of LED control devices 200 connected in parallel, and can greatly reduce the wire The amount of usage is to have a practical function of easy wiring between the sensing switch 100 and the LED control device 200 and reducing construction cost.

In summary, the present invention has indeed reached a breakthrough structural design, and has improved the content of the invention, and at the same time can achieve industrial utility and progress, and the present invention has not been found in any publication, but also novel, when In line with the relevant laws and regulations of the Patent Law, I filed an application for an invention patent in accordance with the law, and urge the examination committee of the Jun Bureau to grant legal patent rights.

The above is only one of the preferred embodiments of the present invention, and it should not be used to limit the scope of implementation of the present invention; that is, all equal changes and modifications made in accordance with the scope of the patent application of the present invention should still belong to the present invention Within the scope of the patent.

100‧‧‧sensor switch

200‧‧‧LED control device

201‧‧‧Current Rectifier Unit

202‧‧‧Current limiting unit

203‧‧‧Transimpedance amplifier unit

204‧‧‧Voltage dividing circuit unit

205‧‧‧Primit circuit unit

206‧‧‧Microcontroller

207‧‧‧Function setting unit

208‧‧‧LED drive control unit

209‧‧‧Reference power unit

210‧‧‧LED light

211‧‧‧Rectifier unit

212‧‧‧Power supply unit

L1‧‧‧wire

Claims (10)

An LED lamp brightness control structure includes: a sensing switch for sensing environmental changes to generate a current signal, and the current signal forms an output through a wire; and at least one LED control device, the LED The control device includes a current rectifying unit, a current limiting unit, a transimpedance amplifying unit, a voltage dividing circuit unit and a pivoting circuit unit. The current rectifying unit is connected to the sensing switch with an anode of a diode Wire, and the current signal is rectified by the diode. The current limiting unit includes a first resistor and a second resistor connected in series with each other. The input end of the first resistor is connected to the cathode of the diode, and The current limiting unit forms the current limit of the current signal. The transimpedance amplifying unit includes an optical output coupler, an optical receiving coupler, and a voltage amplifier. One end of the optical output coupler and the output end of the second resistor Connected, and the other end of the optical output coupler is grounded, allowing the current signal to generate an optical signal through the optical output coupler, and the emitter of the optical receiving coupler is connected to the non-inverting end of the voltage amplifier, and the optical receiving coupler The collector is connected to the inverting end of the voltage amplifier, and the base of the light receiving coupler receives the light signal to generate a voltage signal corresponding to the current signal, and the output end of the voltage amplifier and the voltage divider circuit Unit connection, the voltage signal is amplified by the signal of the voltage amplifier and then flows through the voltage divider circuit unit for voltage division, the non-inverting end of the pivotal circuit unit is connected to the voltage divider circuit unit, and the pivot The Mitte circuit unit receives the voltage signal and generates a square wave signal with ON and OFF lights, and the square wave signal is output from the output end of the pivot Mitte circuit unit to achieve the control purpose. The transimpedance amplifying unit converts the current signal into the voltage signal, and cooperates with the Schmitt circuit to convert the voltage signal into the square wave signal, so that the sensing switch can connect at least one LED control device with a single wire, In order to have a practical function of easy wiring between the sensing switch and the LED control device. The LED lamp brightness control structure according to item 1 of the patent application scope, wherein the transimpedance amplifier further includes a third resistor, a filter, a protector, a fourth resistor and a capacitor, and the light output coupler And the second resistor are connected through the third resistor, and the filter and the protector are connected between the third resistor and the second resistor in parallel with each other, and the other end in parallel with each other is connected to the One end of the optical output coupler is grounded, and the fourth resistor and the capacitor are connected in parallel with each other between the light receiving coupler and the inverting terminal of the voltage amplifier, and the other end in parallel with each other is connected to the light Between the output terminal of the receiving coupler and the input terminal of the voltage dividing circuit unit. The LED lamp brightness control structure according to item 2 of the patent application scope, wherein the voltage dividing circuit unit includes a fifth resistor and a sixth resistor, the fifth resistor and the sixth resistor are connected in series with each other, and the first The input terminal of the five resistors is connected to the output terminal of the light receiving coupler, and the fifth resistor and the sixth resistor are connected to the non-inverting terminal of the Schmitt circuit unit. The LED lamp brightness control structure according to item 3 of the patent application scope, wherein the LED control device further includes a microcontroller and a function setting unit, the microcontroller is connected to the output end of the light receiving coupler, and the function The setting unit is connected between the sixth resistor output terminal and the microcontroller, and the sixth resistor, the microcontroller and the function setting unit form a common ground, and the function setting unit can be manually set, thereby The microcontroller is controlled to perform the set lighting mode after receiving the square wave signal. The LED lamp brightness control structure according to item 4 of the patent application scope, wherein the LED control device further includes a reference power supply unit, the reference power supply unit forming a first end point, a second end point and a third end At this point, the first terminal is used for inputting a DC voltage, and the second terminal is used for grounding, and the third terminal of the reference power supply unit is connected to the voltage amplifier, the Schmitt circuit unit and the microcontroller, The third terminal output provides a low-voltage control DC power supply. According to the LED lamp brightness control structure described in item 5 of the patent application range, the reference power supply unit is a low dropout linear regulator (LDO). The LED lamp brightness control structure according to item 5 of the patent application scope, wherein the LED control device further includes an LED drive control unit, one end of the LED drive control unit is connected to the output end of the microcontroller, and the LED drive control An LED lamp is connected to the other end of the unit, and the LED driving control unit drives the LED lamp to perform lighting and brightness adjustment control, and the brightness adjustment control of the LED driving control unit can form a stepless gradual light or gradual light Variety. The LED lamp brightness control structure according to item 7 of the patent application scope, wherein the LED control device further includes a rectifier unit and a power supply unit, the rectifier unit is connected to an external power supply and the rectified output is connected to the power supply unit and the The LED drive control unit supplies power to the LED lamp through the rectifier unit, and the power supply unit is connected to the reference power unit, and the power is supplied to the reference power unit after stepping down the voltage through the power supply unit. According to the LED lamp brightness control structure described in item 8 of the patent application range, wherein the rectifier unit includes an inductor and a full-wave rectifier, the inductor is connected to an external power supply and the full-wave rectifier, and the rectifier unit passes through the full The wave rectifier connects the power supply unit and the LED drive control unit. The LED lamp brightness control structure according to item 8 of the patent application scope, wherein the power supply unit includes a transistor, a seventh resistor, an eighth resistor, a filter capacitor and a protective diode, the transistor The collector of the transistor is connected to the seventh resistor, and the seventh resistor is connected to the rectifier unit, and the base of the transistor is connected to the protective diode and forms a ground, and the emitter of the transistor is connected to the filter capacitor and formed It is grounded, and the emitter of the transistor is simultaneously connected to the eighth resistor, and the eighth resistor is connected to the first terminal of the reference power supply unit.

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