CN211457453U

CN211457453U - LED dimming circuit and lighting equipment

Info

Publication number: CN211457453U
Application number: CN201921969302.4U
Authority: CN
Inventors: 李水旺; 张文锋
Original assignee: Shenzhen Signcomplex Co Ltd
Current assignee: Shenzhen Signcomplex Co Ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-09-08
Anticipated expiration: 2029-11-13

Abstract

The utility model relates to LED's the technical field of adjusting luminance, in particular to LED dimming circuit and lighting apparatus, it includes DALI converting circuit, be used for converting outside DALI signal into the signal of adjusting luminance, DALI converting circuit includes electric connection's communication interface circuit in proper order, master control circuit and dimming control circuit, wherein, communication interface circuit transmits outside DALI signal conversion to master control circuit and handles in order to generate the PWM signal, dimming control circuit includes comparator U5 and sampling resistor, master control circuit further with PWM signal conveying comparator U5, PWM signal and sampling resistor produce the reference voltage of input and compare and export the signal of adjusting luminance, the signal of adjusting luminance is adjusted luminance to the LED lamp with voltage form. Therefore, the LED dimming circuit has the advantages of simple circuit structure, high dimming precision, good LED lighting effect, simple installation and easy operation.

Description

LED dimming circuit and lighting equipment

[ technical field ] A method for producing a semiconductor device

The utility model relates to LED's the technical field that adjusts luminance, in particular to LED dimmer circuit and lighting apparatus.

[ background of the invention ]

Along with the development of LED lighting technology, intelligent lighting and lighting control systems are more and more popularized, and more dimming LED driving power supplies are provided with auxiliary sources for supplying power to an intelligent controller, so that the intelligent controller of an LED lamp gradually develops into an accessory which can be independently added and installed by a terminal customer.

However, in the current dimming application field of LEDs, the dimming of LEDs mainly includes 1-10V analog dimming, PWM dimming and thyristor dimming, and these dimming methods have the problems of poor dimming precision and complex installation due to the complicated problem of LED dimming circuit, so that an LED dimming circuit and an illumination device are needed to solve the problems of complicated LED dimming circuit and complex installation.

[ summary of the invention ]

For overcoming the problem that there is LED dimmer circuit complicacy and installation complicacy among the current LED technique of adjusting luminance, the utility model provides a LED dimmer circuit and lighting apparatus.

The utility model provides a technical problem's scheme provides a LED dimmer circuit for adjust luminance to the LED lamp, it includes DALI converting circuit, is used for converting outside DALI signal into the signal of adjusting luminance, DALI converting circuit includes electric connection's communication interface circuit, master control circuit and dimming control circuit in proper order, and wherein, communication interface circuit sends outside DALI signal conversion to master control circuit and handles in order to generate the PWM signal, and dimming control circuit includes comparator U5 and sampling resistor, and master control circuit further sends PWM signal to comparator U5, PWM signal and sampling resistor produce the reference voltage of input and compare and export the signal of adjusting luminance, the signal of adjusting luminance is adjusted luminance to the LED lamp with voltage form.

Preferably, the DALI conversion circuit further comprises a power supply circuit, and the power supply circuit is electrically connected with the communication interface circuit, the main control circuit and the dimming control circuit respectively and provides an electric energy source; the power supply circuit comprises a voltage reduction and stabilization chip U1 and at least 4 capacitors which are respectively C1, C2, C3 and C4, a 1 st electrode after the capacitors C1 and C2 are connected IN parallel is electrically connected with an input end IN of the voltage reduction and stabilization chip U1, the 1 st electrode of the capacitor C1 is electrically connected with a 1 st electrode of the C2 to serve as a second power supply end together with an accessed external input voltage, the 1 st electrode after the capacitors C3 and C4 are connected IN parallel is electrically connected with an output end OUT of the voltage reduction and stabilization chip U1, the 1 st electrode of the capacitor C3 and the 1 st electrode of the C4 are electrically connected to serve as a first power supply end and output a power supply voltage to a communication interface circuit and a main control circuit, the 2 nd electrode of the capacitor C1 is electrically connected with a 2 nd electrode of the C2, the 2 nd electrode of the capacitor C3 is electrically connected with a 2 nd electrode of the C4, and the GND end of the voltage reduction and stabilization chip U1 is grounded.

Preferably, the sampling resistor includes resistors R10 and R13, wherein the 1 st electrode of the resistor R10 is electrically connected to the second power supply terminal of the power supply circuit, the 2 nd electrode of the resistor R10 is electrically connected to the 1 st electrode of the resistor R13 to generate a reference voltage, the reference voltage is input to the IN2+ terminal of the comparator U5, and the 2 nd electrode of the resistor R13 is grounded.

Preferably, the main control circuit includes an MCU chip U2, a resistor R14 and a capacitor C10, the 1 st electrode of the resistor R14 and the VDD terminal of the MCU chip U2 are both electrically connected to the first power supply terminal, the 2 nd electrode of the resistor and the 1 st electrode of the capacitor C10 are electrically connected to the P2.0/RST terminal of the MCU chip U2, the second terminal of the capacitor C10 is grounded to form a reset circuit, the P0.4/AIN5/PWM3 terminal and the P1.4/SDA/PWM1 terminal of the MCU chip U2 are respectively electrically connected to the communication interface circuit, the communication interface circuit and the MCU chip U2 communicate with a DALI _ RX signal and a DALI _ TX signal, and the P0.5/PWM2/AIN4 pin of the MCU chip U2 is electrically connected to the dimming control circuit to output a PWM signal to the dimming control circuit.

Preferably, the dimming control circuit further comprises a transistor Q2, a capacitor C2, an output interface J2, and six resistors R2, and R2, wherein the OUT2 terminal and the IN 2-terminal of the comparator U2 are electrically connected to the 1 st electrode of the resistor R2 and the 1 st electrode of the resistor R2, the 2 nd electrode of the resistor is electrically connected to the IN 2-terminal of the comparator U2 and the 1 st electrode of the resistor R2, the 2 nd electrode of the resistor R2 is grounded, the IN2+ terminal of the comparator U2 is electrically connected to the 1 st electrode of the resistor R2, the 2 nd electrode of the resistor R2 is electrically connected to the 1 st electrode of the capacitor C2 and the 1 st electrode of the resistor R2, the 2 nd electrode of the resistor R2 is electrically connected to the P0.5/2/AIN terminal of the MCU chip U2, and the PWM signal output terminal of the PWM chip P2 is electrically connected to the GND terminal 2/PWM chip 2, and the capacitor C2/al 2 is electrically connected to the GND terminal 2, the 2 nd electrode of the resistor R6 is electrically connected with the 1 st electrode of the triode Q2 and then electrically connected with the output interface J2 so as to output an adjustable signal DIM; the terminal OUT2 of the comparator U5 is electrically connected to the 1 st electrode of the resistor R9, the 2 nd electrode of the resistor R9 is electrically connected to the base B of the transistor Q2, so as to output an OFF signal to the base B of the transistor Q2, the 3 rd electrode of the output interface J2 is electrically connected to the second power supply terminal of the power supply circuit, and the 2 nd electrode of the output interface J2 is grounded.

Preferably, the communication interface circuit comprises five resistors R1, R2, R3, R4 and R5 respectively, two photocouplers U3 and U4, a rectifier bridge VD, a transistor Q1, a voltage regulator D5 and a BUS interface J2, the 1 st electrode of the rectifier bridge VD is electrically connected to the 2 nd electrode of the photocoupler U3, the 2 nd electrode of the transistor Q1 and the 1 st electrode of the resistor R5, the 3 rd electrode of the rectifier bridge VD is electrically connected to the 1 st electrode of the voltage regulator D5, the 1 st electrode of the transistor Q1 and the 3 rd electrode of the photocoupler U4, the 2 nd electrode and the 4 th electrode of the rectifier bridge VD are electrically connected to the 2 nd electrode and the 1 st electrode of the BUS interface J2 respectively and pin signals DALI _ DALI 1 and BUS _ BUS2 can be led out through the BUS interface J2, the 2 nd electrode of the voltage regulator D2 is electrically connected to the 2 nd electrode of the R861 st electrode of the resistor R8656 and the electrode of the BUS interface J8653, the 1 st electrode of the resistor R4 is electrically connected with the first power supply end of the power supply circuit, the 2 nd electrode of the resistor R4 is electrically connected with the 3 rd electrode of the photoelectric coupler U3 and then is electrically connected with the P0.4/AIN5/PWM3 end of the MCU chip U2, and then the communication interface circuit and the MCU chip U2 are communicated by DALI _ TX signals; the 4 th electrode of the photoelectric coupler U3 is grounded, the base B of the triode Q1 is electrically connected with the 1 st electrode of the resistor R2, the 2 nd electrode of the resistor R2 is electrically connected with the 2 nd electrode of the resistor R5 and the 4 th electrode of the photoelectric coupler U4, the 1 st electrode of the photoelectric coupler U4 is electrically connected with the 1 st electrode of the resistor R1, the 2 nd electrode of the resistor R1 is electrically connected with the P1.4/SDA/PWM1 end of the MCU chip U2, the communication interface circuit and the MCU chip U2 communicate with each other by a DALI _ RX signal, and the 2 nd electrode of the photoelectric coupler U4 is grounded.

Preferably, the MCU chip U2 is an integrated chip of type N767003, and the P0.2/ICPCK/TXD-1 end and the P1.6/ICPDA/TXD _1 end of the MCU chip U2 are respectively used as CLK signal and DAT signal input ends for a burning program.

Preferably, the comparator U5 is an integrated chip of model LM 2904.

Preferably, the LED dimming circuit further includes an LED driving circuit electrically connected to the DALI conversion circuit, and the DALI conversion circuit converts and outputs an adjustable signal to be transmitted to the LED driving circuit in a voltage form to control the LED lamp to perform dimming.

Preferably, a lighting device comprises the LED dimming circuit and at least one LED lamp connected thereto.

Compared with the prior art, the utility model discloses a LED dimmer circuit and lighting apparatus's beneficial effect as follows:

1. an LED dimming circuit is used for dimming an LED lamp and comprises a DALI conversion circuit and a communication interface circuit, a main control circuit and a dimming control circuit, wherein the DALI conversion circuit is used for converting an external DALI signal into a dimming signal and comprises the communication interface circuit, the main control circuit and the dimming control circuit which are electrically connected in sequence, the communication interface circuit converts the external DALI signal into a digital signal and transmits the digital signal to the main control circuit to be processed so as to generate a PWM signal, the dimming control circuit comprises a comparator U5 and a sampling resistor, the main control circuit further transmits the PWM signal to the comparator U5 to be compared with a reference voltage generated by the sampling resistor and outputs the dimming signal, and the signal is used for dimming the LED lamp in a voltage mode. The communication interface circuit at LED dimmer circuit adopts DALI communication protocol, the utility model discloses a LED dimmer circuit adopts less electronic component to realize intelligent dimming in hardware circuit design, and the precision of just adjusting luminance is high, and the low power dissipation of circuit makes LED illuminating effect better, still holds the advantage of installing simple easy operation simultaneously concurrently, can be convenient for intelligent energy-conserving product's of illumination popularization and application.

2. The power supply circuit adopts a voltage reduction and stabilization chip of a model 7805, can achieve a good voltage reduction and stabilization effect, is simple in circuit connection, reduces power consumption in a voltage conversion process, and improves the use efficiency of electric energy.

3. The MCU chip U2 of the main control circuit adopts a model N767003 integrated chip, and the whole circuit system is sensitive and efficient in communication and control.

4. The communication interface circuit adopts the photoelectric coupler when establishing electrical connection with the main control circuit, so that the electrical isolation of the input circuit and the output circuit is realized in the conversion process of realizing electric signals → optical signals → electric signals, and the electric signals have the advantages of unidirectionality and the like during transmission, so that the communication interface circuit has good electromagnetic wave interference resistance and electrical insulation capability.

5. The dimming control circuit adopts a model LM2904 integrated chip as a core chip of the sub-circuit module, the circuit connection is relatively simple, and the control performance is relatively stable and good.

6. Be provided with BUS interface J2 at communication interface circuit, be provided with output interface J1 at dimming control circuit for the intelligent control of LED illumination lamps and lanterns evolves into the accessory that can let terminal customer conveniently independently add the installation, lets installation intelligent control become simply.

7. The utility model provides a lighting device, lighting device includes LED dimmer circuit, lighting device with above-mentioned LED dimmer circuit have the precision of adjusting luminance height for current lighting device, and the effect of the low power dissipation of circuit has using value.

[ description of the drawings ]

Fig. 1 is a schematic block diagram of a first embodiment of the present invention;

fig. 2 is a schematic diagram of a DALI conversion circuit module based on the LED dimming circuit shown in fig. 1;

fig. 3 is a schematic diagram of a power supply circuit structure of the present invention based on the DALI conversion circuit shown in fig. 2;

fig. 4 is a schematic diagram of a main control circuit structure of the DALI conversion circuit shown in fig. 2;

fig. 5 is a schematic diagram of a communication interface circuit structure of the present invention based on the DALI conversion circuit shown in fig. 2;

fig. 6 is a schematic diagram of a dimming control circuit structure based on the DALI conversion circuit shown in fig. 2;

fig. 7 is a schematic structural diagram of a lighting device according to a second embodiment of the present invention.

Reference is made to the accompanying drawings in which:

100. an LED dimming circuit; 101. an LED drive circuit; 102. an LED lamp; 200. a DALI conversion circuit; 201. a power supply circuit; 202. a master control circuit; 203. a communication interface circuit; 204. a dimming control circuit; 300. an illumination device.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a first embodiment of the present invention provides an LED dimming circuit 100, which is mainly used for performing intelligent dimming control on an LED lamp 102 shown in fig. 1, and includes an LED driving circuit 101 and a DALI conversion circuit 200, wherein the LED driving circuit 101 has 3 wires LED out, that is, a live wire L, a zero wire N, and a ground wire G are externally connected to a commercial power, when the commercial power is controlled, the LED driving circuit 101 can only drive the LED lamp 102 with fixed brightness, and when the DALI conversion circuit 200 is connected, the intelligent dimming control can be completed.

The DALI conversion circuit 200 can provide an electric energy source for the DALI conversion circuit 200 by converting the commercial power into the supply voltage required by the DALI conversion circuit 200 or externally inputting the supply voltage, for example, 12V, the DALI conversion circuit 200 is convenient for the DALI conversion circuit 200 to be in communication connection with the outside by externally leading out the DALI _ BUS1 and the DALI _ BUS2, after receiving the communication control information of the outside, the DALI conversion circuit 200 can transmit the signal required for dimming to the LED driving circuit 101 in a voltage form by leading out a DIM wire, and the LED driving circuit 101 drives the LED lamp 102 to generate different brightness under different voltage values after receiving the voltage values, namely, the intelligent dimming effect is achieved, so that different brightness requirements are met.

Referring to fig. 2, the DALI conversion circuit 200 includes a communication interface circuit 203, a main control circuit 202, and a dimming control circuit 204, which are electrically connected in sequence, and a power supply circuit 201, which is electrically connected to the communication interface circuit 203, the main control circuit 202, and the dimming control circuit 204, respectively, and provides an electric energy source. The communication interface circuit 203 receives an external DALI signal through the DALI _ BUS1 and the DALI _ BUS2, converts the external DALI signal into a digital signal, transmits the digital signal to the main control circuit 202 for processing, and generates a PWM signal, and the main control circuit 202 further transmits the PWM signal to the dimming control circuit 204 for comparison processing, and outputs a required voltage value to the LED driving circuit 101 to control the LED lamp 102 to dim.

Referring to fig. 3, the power supply circuit 201 includes a buck regulator chip U1 and at least 4 capacitors C1, C2, C3 and C4, the 1 st electrode of the capacitor C1 and the capacitor C2 which are connected IN parallel is electrically connected with the input end IN of the buck regulator chip U1, and the 1 st electrode of the capacitor C1 and the 1 st electrode of the capacitor C2 are electrically connected and then are used as a second power supply end with the accessed external input voltage, the 1 st electrode of the capacitors C3 and C4 after being connected in parallel is electrically connected with the output end OUT of the buck regulator chip U1, and the 1 st electrode of the capacitor C3 and the 1 st electrode of the capacitor C4 are electrically connected to serve as the first power supply terminal of the power supply circuit 201 and output the power supply voltage to the communication interface circuit and the main control circuit, the 2 nd electrode of the capacitor C1 is electrically connected with the 2 nd electrode of the C2, the 2 nd electrode of the capacitor C3 is electrically connected with the 2 nd electrode of the C4, and the GND end of the buck regulator chip U1 is grounded. The buck regulator chip U1 may optionally be a 7805 integrated chip. The second power supply terminal optionally adopts a +12V power supply voltage, and the first power supply terminal of the power supply circuit 201 optionally adopts a +5V power supply voltage.

It should be understood that, referring to fig. 3, the number of the capacitors at the first and second power supply terminals of the power supply circuit 201 is not limited to only 4 capacitors C1, C2, C3 and C4 as filtering capacitors, when the input voltage value of the second power supply terminal is unstable or there is a current clutter, a capacitor C6 and a capacitor C7 connected in parallel may be added to the second power supply terminal to filter out the current clutter and stabilize the voltage, and similarly, when the output voltage value of the first power supply terminal is unstable or there is a current clutter, a capacitor C8 and a capacitor C9 connected in parallel may be added to the first power supply terminal to filter out the current clutter and stabilize the voltage.

Referring to fig. 4, the main control circuit 202 includes an MCU chip U2, a resistor R14 and a capacitor C10, the 1 st electrode of the resistor R14 and the VDD terminal of the MCU chip U2 are both electrically connected to the first power supply terminal, the 2 nd electrode of the resistor and the 1 st electrode of the capacitor C10 are electrically connected to the P2.0/RST terminal of the MCU chip U2, and the second terminal of the capacitor C10 is grounded to form a reset circuit; the P0.4/AIN5/PWM3 terminal and the P1.4/SDA/PWM1 terminal of the MCU chip U2 are electrically connected to the communication interface circuit 203, the communication interface circuit 203 communicates with the MCU chip U2 by DALI _ RX signal and DALI _ TX signal, and the pin P0.5/PWM2/AIN4 of the MCU chip U2 is electrically connected to the dimming control circuit 204 to output a PWM signal to the dimming control circuit 204. Furthermore, the P0.2/ICPCK/TXD-1 end and the P1.6/ICPDA/TXD-1 end of the MCU chip U2 can be used as a CLK signal and a DAT signal input end respectively for a burning program. The MCU chip U2 adopts a model N767003 integrated chip.

Referring to fig. 5, the communication interface circuit 203 includes five resistors R1, R2, R3, R4 and R5, two photo couplers U3 and U4, a rectifier bridge VD, a transistor Q1, a voltage regulator D5 and a BUS interface J2, the 1 st electrode of the rectifier bridge VD is electrically connected to the 2 nd electrode of the photo coupler U3, the 2 nd electrode of the transistor Q1 and the 1 st electrode of the resistor R5, the 3 rd electrode of the rectifier bridge VD is electrically connected to the 1 st electrode of the voltage regulator D5, the 1 st electrode of the transistor Q1 and the 3 rd electrode of the photo coupler U4, the 2 nd electrode and the 4 th electrode of the rectifier bridge are electrically connected to the 2 nd electrode and the 1 st electrode of the BUS interface J2 respectively and pin signals DALI _ BUS1 and DALI _ D2 can be led out through the BUS interface J2 to the 2 nd electrode of the BUS interface J2 and the 2 nd electrode of the voltage regulator R8653 and the BUS interface J592 nd electrode of the resistor R8653, the 1 st electrode of the resistor R4 is electrically connected with the first power supply end of the power supply circuit 201, the 2 nd electrode of the resistor R4 is electrically connected with the 3 rd electrode of the photoelectric coupler U3 and then is electrically connected with the P0.4/AIN5/PWM3 end of the MCU chip U2, and then the communication interface circuit 203 and the MCU chip U2 communicate with each other by means of DALI _ TX signals; the 4 th electrode of the photoelectric coupler U3 is grounded, the base B of the triode Q1 is electrically connected with the 1 st electrode of the resistor R2, the 2 nd electrode of the resistor R2 is electrically connected with the 2 nd electrode of the resistor R5 and the 4 th electrode of the photoelectric coupler U4, the 1 st electrode of the photoelectric coupler U4 is electrically connected with the 1 st electrode of the resistor R1, the 2 nd electrode of the resistor R1 is electrically connected with the P1.4/SDA/PWM1 end of the MCU chip U2, the communication interface circuit 203 and the MCU chip U2 communicate with each other by a DALI _ RX signal, and the 2 nd electrode of the photoelectric coupler U4 is grounded. The photoelectric couplers U3 and U4 are adopted to realize the electrical isolation of input and output circuits in the process of converting electric signals → optical signals → electric signals, and have good electromagnetic wave interference resistance and electrical insulation capability. The transistor Q1 may be an NPN transistor or a PNP transistor.

Referring to fig. 6, the dimming control circuit 204 includes a resistor R10 and a resistor R13, wherein the 1 st electrode of the resistor R10 is electrically connected to the second power supply terminal of the power supply circuit, the 2 nd electrode of the resistor R10 is electrically connected to the 1 st electrode of the resistor R13 to generate a reference voltage, the reference voltage is input to the IN2+ terminal of the comparator U5, the 2 nd electrode of the resistor R13 is grounded, and the resistor R10 and the resistor R13 are collectively referred to as a sampling resistor.

As shown IN fig. 6, the dimming control circuit 204 further includes a comparator U5, a transistor Q5, a capacitor C5, an output interface J5, and six resistors R5, and R5, wherein an OUT 5 terminal and an IN5 terminal of the comparator U5 are electrically connected to the 1 st electrode of the resistor R5 and the 1 st electrode of the resistor R5, a 2 nd electrode of the resistor is electrically connected to the IN5 terminal of the comparator U5 and the 1 st electrode of the resistor R5, a 2 nd electrode of the resistor R5 is grounded, a n5 + terminal of the comparator is electrically connected to the 1 st electrode of the resistor R5, a 2 nd electrode of the resistor R5 is electrically connected to the 1 st electrode of the capacitor C5 and the 1 st electrode of the resistor R5, a 2 nd electrode of the resistor R5 is electrically connected to the P0.5/n 5 of the MCU U5, and an al/n 0 th electrode of the comparator U5 is electrically connected to the ground of the MCU 5, the 2 nd electrode of the resistor R6 is electrically connected with the 1 st electrode of the triode Q2 and then electrically connected with the output interface J2 so as to output an adjustable signal DIM; the OUT2 end of the comparator U5 is electrically connected to the 1 st electrode of the resistor R9, the 2 nd electrode of the resistor R9 is electrically connected to the base B of the transistor Q2, so as to output an OFF signal to the base B of the transistor Q2, the 3 rd electrode of the output interface J2 is electrically connected to the second power supply end of the power supply circuit 201, and the 2 nd electrode of the output interface J2 is grounded. In order to make the dimming control circuit 204 operate normally, the comparator U5 is an integrated chip of model LM 2904. The transistor Q2 may be an NPN transistor or a PNP transistor.

In summary, the operating principle of the LED dimming circuit 100 is as follows: the power supply circuit provides electric energy for the LED dimming circuit 100, the communication interface circuit 203 adopts DALI communication protocol, and pin signals DALI _ BUS1 and DALI _ BUS2 are LED out through a BUS interface J2 to establish electrical connection with the outside, meanwhile, DALI _ RX and DALI _ TX are LED out from the communication interface circuit 203 to establish electrical connection with pin signals DALI _ RX and DALI _ TX of an MCU chip of the main control circuit 202, respectively, at this time, the outside transmits DALI signals to the communication interface circuit 203 through the BUS interface J2 to be converted into digital signals to communicate with the main control circuit 202, after the MCU chip of the main control circuit 202 completes communication with the outside, the main control circuit 202 outputs PWM signals to the input end of the comparator of the dimming control circuit 204 after processing the communication information, the comparator of the dimming control circuit 204 compares the input PWM signals with the reference voltage generated by the sampling resistor, and then outputs a required adjustable signal to the LED driving circuit 101 in the form of voltage, thereby controlling the LED lamp 102 to perform dimming.

Referring to fig. 7, a second embodiment of the present invention provides an illumination device 300, which includes the LED dimming circuit 100 and at least one LED lamp 102 electrically connected thereto, wherein the illumination device 300 may be an LED tunnel lamp, an LED cabinet lamp, an LED industrial and mining lamp, an LED tri-proof lamp, an LED wall washer, an LED ground embedded lamp, or the like.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, and improvements made within the principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a LED dimmer circuit for adjust luminance to the LED lamp which characterized in that: the DALI conversion circuit comprises a communication interface circuit, a main control circuit and a dimming control circuit which are electrically connected in sequence, wherein the communication interface circuit converts an external DALI signal into a digital signal and transmits the digital signal to the main control circuit to be processed so as to generate a PWM signal, the dimming control circuit comprises a comparator U5 and a sampling resistor which are electrically connected, the main control circuit further transmits the PWM signal to the comparator U5, the PWM signal is compared with a reference voltage which is generated and input by the sampling resistor and outputs a dimming signal, and the dimming signal is used for dimming an LED lamp in a voltage mode.

2. The LED dimming circuit of claim 1, wherein: the DALI conversion circuit further comprises a power supply circuit, and the power supply circuit is electrically connected with the communication interface circuit, the master control circuit and the dimming control circuit respectively and provides an electric energy source; the power supply circuit comprises a buck regulator chip U1 and at least 4 capacitors which are respectively C1, C2, C3 and C4, wherein a 1 st electrode after the capacitors C1 and C2 are connected IN parallel is electrically connected with an input end IN of the buck regulator chip U1, the 1 st electrode of the capacitor C1 and a 1 st electrode of C2 are electrically connected and then serve as second power supply ends with an accessed external input voltage, the 1 st electrode after the capacitors C3 and C4 are connected IN parallel is electrically connected with an output end OUT of the buck regulator chip U1, the 1 st electrode of the capacitor C3 and the 1 st electrode of C4 are electrically connected and then serve as first power supply ends and output power supply voltages to a communication interface circuit and a main control circuit, the 2 nd electrode of the capacitor C1 and the 2 nd electrode of the capacitor C2 are electrically connected, and the 2 nd electrode of the capacitor C3 and the 2 nd electrode of the capacitor C4 are electrically connected and the GND terminal of the buck regulator chip U1 is grounded.

3. The LED dimming circuit of claim 2, wherein: the sampling resistor comprises resistors R10 and R13, wherein the 1 st electrode of the resistor R10 is electrically connected with the second power supply end of the power supply circuit, the 2 nd electrode of the resistor R10 is electrically connected with the 1 st electrode of the resistor R13 to generate a reference voltage, the reference voltage is input to the IN2+ end of the comparator U5, and the 2 nd electrode of the resistor R13 is grounded.

4. The LED dimming circuit of claim 2, wherein: the main control circuit comprises an MCU chip U2, a resistor R14 and a capacitor C10, wherein the 1 st electrode of the resistor R14 and the VDD end of the MCU chip U2 are both electrically connected with the first power supply end, the 2 nd electrode of the resistor and the 1 st electrode of the capacitor C10 are electrically connected and then connected to the P2.0/RST end of the MCU chip U2, the second end of the capacitor C10 is grounded to form a reset circuit, the P0.4/AIN5/PWM3 end and the P1.4/SDA/PWM1 end of the MCU chip U2 are respectively and electrically connected with the communication interface circuit, the communication interface circuit and the MCU chip U2 communicate with a DALI _ RX signal and a DALI _ TX signal, and the pins P0.5/PWM2/AIN4 of the MCU chip U2 are electrically connected with the dimming control circuit to output a PWM signal to the dimming control circuit.

5. The LED dimming circuit of claim 4, wherein: the dimming control circuit further comprises a triode Q2, a capacitor C2, an output interface J2 and six resistors R2, R2 and R2, wherein an OUT2 terminal and an IN2 terminal of the comparator U2 are electrically connected to a 1 st electrode of the resistor R2 and a 1 st electrode of the resistor R2, a 2 nd electrode of the resistor is electrically connected to the IN2 terminal of the comparator U2 and the 1 st electrode of the resistor R2, the 2 nd electrode of the resistor R2 is grounded, an IN2+ terminal of the comparator U2 is electrically connected to the 1 st electrode of the resistor R2, a 2 nd electrode of the resistor R2 is electrically connected to the 1 st electrode of the capacitor C2 and the 1 st electrode of the resistor R2, the 2 nd electrode of the resistor R2 is electrically connected to the P0.5/2/PWM terminal of the MCU chip U2, and the capacitor al 2 is connected to the GND terminal of the capacitor U2, and the PWM signal output to the first electrode of the MCU 2, and the PWM signal output terminal of the PWM chip 14 and the GND. The 2 nd electrode of the resistor R6 is electrically connected with the 1 st electrode of the triode Q2 and then electrically connected with the output interface J2 so as to output an adjustable signal DIM; the terminal OUT2 of the comparator U5 is electrically connected to the 1 st electrode of the resistor R9, the 2 nd electrode of the resistor R9 is electrically connected to the base B of the transistor Q2, so as to output an OFF signal to the base B of the transistor Q2, the 3 rd electrode of the output interface J2 is electrically connected to the second power supply terminal of the power supply circuit, and the 2 nd electrode of the output interface J2 is grounded.

6. The LED dimming circuit of claim 4, wherein: the communication interface circuit comprises five resistors R1, R2, R3, R4 and R5 respectively, two photocouplers U3 and U4, a rectifier bridge VD, a triode Q1, a voltage stabilizing tube D5 and a BUS interface J2, wherein the 1 st electrode of the rectifier bridge VD is electrically connected with the 2 nd electrode of the photocoupler U3, the 2 nd electrode of the triode Q1 and the 1 st electrode of the resistor R5, the 3 rd electrode of the rectifier bridge VD is electrically connected with the 1 st electrode of the voltage stabilizing tube D5, the 1 st electrode of the triode Q1 and the 3 rd electrode of the photocoupler U4, the 2 nd electrode and the 4 th electrode of the rectifier bridge VD are electrically connected with the 2 nd electrode and the 1 st electrode of the BUS interface J2 respectively, and signals DALI _1 and DALI _ 869 can be led out through the BUS interface J2, the 2 nd electrode of the voltage stabilizing tube D2 is electrically connected with the 1 st electrode of the R56 and the U3 and the BUS interface J8653, the 1 st electrode of the resistor R4 is electrically connected with the first power supply end of the power supply circuit, the 2 nd electrode of the resistor R4 is electrically connected with the 3 rd electrode of the photoelectric coupler U3 and then is electrically connected with the P0.4/AIN5/PWM3 end of the MCU chip U2, and then the communication interface circuit and the MCU chip U2 are communicated by DALI _ TX signals; the 4 th electrode of the photoelectric coupler U3 is grounded, the base B of the triode Q1 is electrically connected with the 1 st electrode of the resistor R2, the 2 nd electrode of the resistor R2 is electrically connected with the 2 nd electrode of the resistor R5 and the 4 th electrode of the photoelectric coupler U4, the 1 st electrode of the photoelectric coupler U4 is electrically connected with the 1 st electrode of the resistor R1, the 2 nd electrode of the resistor R1 is electrically connected with the P1.4/SDA/PWM1 end of the MCU chip U2, the communication interface circuit and the MCU chip U2 communicate with each other by a DALI _ RX signal, and the 2 nd electrode of the photoelectric coupler U4 is grounded.

7. The LED dimming circuit of claim 4, wherein: the MCU chip U2 adopts a model N767003 integrated chip, and the P0.2/ICPCK/TXD-1 end and the P1.6/ICPDA/TXD-1 end of the MCU chip U2 are respectively used as CLK signal and DAT signal input ends for a burning program.

8. The LED dimming circuit of claim 1, wherein: the comparator U5 is an integrated chip of model LM 2904.

9. The LED dimming circuit of claim 1, wherein: the DALI conversion circuit converts and outputs an adjustable signal and transmits the adjustable signal to the LED driving circuit in a voltage form so as to control the LED lamp to adjust the light.

10. An illumination device, characterized by: comprising the LED dimming circuit according to any of claims 1-9 and at least one LED lamp connected thereto.