CN103313473A

CN103313473A - Power line carrier communication-based light-emitting diode (LED) dimming circuit

Info

Publication number: CN103313473A
Application number: CN2013102062135A
Authority: CN
Inventors: 秦会斌; 魏秀梅; 杨波
Original assignee: Hangzhou Dianzi University
Current assignee: Hangzhou Dianzi University
Priority date: 2013-05-29
Filing date: 2013-05-29
Publication date: 2013-09-18

Abstract

The invention discloses a power line carrier communication-based light-emitting diode (LED) dimming circuit which comprises an upper computer, a main controller, a slave controller, an LED dimming module and an LED lamp group, wherein the upper computer is connected with the main controller by a serial port, so that the address allocation of the slave controller as well as the state monitoring and the dimming control of the LED lamp group can be realized; data communication is carried out between the main controller and the slave controller by a power line; the slave controller outputs corresponding pulse-width modulation (PWM) signals into the LED dimming module according to control signals sent by the upper computer; the output current can be changed by adjusting the duty ratio of PWM wave, so that the dimming aim of the LED lamp group can be achieved; the wire communication technology is adopted, so that the reliability is high; and the existing power line is used for communication, so that the cost is low.

Description

LED light adjusting circuit based on power line carrier communication

Technical field

The invention belongs to LED Driving technique field, be specifically related to a kind of LED light adjusting circuit based on power line carrier communication.

Background technology

The LED illumination is with energy-efficient, and the long-life, the plurality of advantages such as good visual effect are replacing conventional light source.In order to arrive the purpose of electrical energy saving, the LED light adjusting circuit is widely used.The Wireless Light modulating engineering reliability needs further to improve in the existing LED light adjusting circuit, and cable technology need to be set up independent order wire in addition, and cost is high, and construction is inconvenient.

Summary of the invention

In order to solve the problems of the technologies described above, the present invention proposes a kind of LED light adjusting circuit based on power line carrier communication, adopts the cable communicating technology reliability high, utilizes existing power line to communicate cost low.

The present invention includes host computer, master controller, from controller, LED light-adjusting module and LED lamp group; Described host computer is connected with described master controller by serial ports, realizes from the address assignment of controller, status monitoring and the brightness adjustment control of LED lamp group; Described master controller and from carrying out data communication by power line between the controller; The described control signal of sending according to described host computer from controller is exported corresponding pwm signal to described LED light-adjusting module, changes the size of output current and then reaches the light modulation purpose of LED lamp group by the duty ratio of regulating the PWM ripple.

Beneficial effect of the present invention:

1. employing wire communication, communication reliability is high, distance, can realize remote accurately light modulation.

2. adopt the LED light adjusting circuit of existing power line carrier communication, need not the again construction of line, realize that cost is low.

3. because power line extends in all direction, adopt the LED light adjusting circuit applied range of power line carrier communication.

4. adopt Intelligent Single-Chip Based control with better function, the system expandability is strong, can realize the control of many group LED lamps.

5. the upper computer software programming distributes the address, and load LED lamp group can freely access.

Description of drawings

Fig. 1 is overall construction drawing of the present invention.

Fig. 2 is the circuit logic structure chart of master controller of the present invention.

Fig. 3 is that the present invention is from the circuit logic structure chart of controller.

Fig. 4 is LED light-adjusting module embodiment schematic diagram of the present invention.

Embodiment

The invention will be further described below in conjunction with accompanying drawing.

A kind of LED light adjusting circuit based on power line carrier communication as shown in Figure 1 comprises host computer, master controller, from controller, LED light-adjusting module and LED lamp group; Described host computer is connected with described master controller by serial ports, realizes from the address assignment of controller, status monitoring and the brightness adjustment control of LED lamp group; Described master controller and from carrying out data communication by power line between the controller; The described control signal of sending according to described host computer from controller is exported corresponding pwm signal to described LED light-adjusting module, changes the size of output current and then reaches the light modulation purpose of LED lamp group by the duty ratio of regulating the PWM ripple.

With reference to accompanying drawing 2, the circuit logic structure chart of master controller of the present invention.As shown in Figure 2, described master controller comprises single-chip microcomputer, power circuit, clock circuit, carrier communication module, interface circuit and expansion interface circuit; Described single-chip microcomputer adopts STM32, main being responsible for and the carrier communication module communication; Described power circuit mainly is responsible for powering to master controller; Described clock circuit mainly is responsible for providing the system reference clock to master controller; Described interface circuit is connected with low-voltage power line, mainly be responsible for master controller with from communicating by letter between the controller; Described expansion interface circuit is mainly used in system extension and uses; Described carrier communication module adopts the PL3106 chip, comprises transtation mission circuit, carrier wave coupling circuit, carrier wave receiving circuit and other interface circuits; Described transtation mission circuit mainly is responsible for the modulation signal that the PL3106 chip produces is carried out power amplification; Described carrier wave coupling circuit mainly plays the surge protective effect; Described carrier wave is just received main circuit and will be responsible for useful signal is carried out filtering, improves receiving sensitivity; Described other interface circuits mainly are responsible for expanded function and are used.

With reference to accompanying drawing 3, the present invention is from the circuit logic structure chart of controller.As shown in Figure 3, describedly comprise carrier communication module from controller; Described carrier communication module adopts the PL3106 chip, is built-in with 8051MCU, and peripheral circuit comprises transtation mission circuit, carrier wave coupling circuit, carrier wave receiving circuit and other interface circuits, the main responsible dim signal that master controller sends that receives; Described built-in 8051MCU, the main light modulation of being responsible for controlling by the PWM mode LED lamp group; Described transtation mission circuit mainly is responsible for the modulation signal that the PL3106 chip produces is carried out power amplification; Described carrier wave coupling circuit mainly plays the surge protective effect; Described carrier wave is just received main circuit and will be responsible for useful signal is carried out filtering, improves receiving sensitivity; Described other interface circuits mainly are responsible for expanded function and are used.

With reference to accompanying drawing 4, LED light-adjusting module embodiment schematic diagram of the present invention.As shown in Figure 4, described LED light-adjusting module adopts the PT4115 integrated chip, comprises foreign current sampling resistor Rs, Schottky diode D, inductance L, light source led and confession electrical input VIN and earth terminal GND; Another termination light source led of external sampling resistance R s one termination power supply input VIN is anodal, inductance L one another termination Schottky diode of termination light source led negative pole D is anodal, Schottky diode D negative pole connects for electrical input VIN, integrated chip PT4115 pin VIN connects for electrical input VIN, integrated chip PT4115 pin CSN connects the light source led positive pole, integrated chip PT4115 pin SW connects the positive pole of Schottky diode D, integrated chip PT4115 pin DIM described from controller MCU, integrated chip PT4115 pin GND meets earth terminal GND.

Realize that by pwm signal the light modulation principle is as follows: host computer sends the duty ratio of dim signal PWM, issue master controller through serial ports, master controller is passed to from controller by power line after signal is modulated, receive the signal on the power line and will issue 8051MCU after the signal demodulation from controller, 8051MCU exports corresponding pwm signal to the LED light-adjusting module, the conducting of control switch pipe and turn-off time, the size of current of led light source is flow through in control, realizes light modulation.

The size of led light source electric current

The pwm signal duty ratio that adopts resistance R s and integrated chip PT4115 pin DIM to receive by the outside determines

, formula is as follows:

Figure 2013102062135100002DEST_PATH_IMAGE006

Duty cycle range: 0≤

≤ 100%;

The scope of pwm signal voltage magnitude V is: 2.5V＜V＜5V;

The frequency of the PWM dim signal that suggestion arranges can be seen the flicker of led light source greater than 100Hz with the eyes of avoiding the people, the light modulating frequency of integrated chip PT4115 can reach 20KHz.

Claims

1. The LED dimming circuit based on power line carrier communication is characterized in that: it includes a host computer, a master controller, a slave controller, an LED dimming module and an LED light group; the host computer communicates with the master controller through a serial port controller connection to realize the address assignment of the slave controller, the state monitoring and dimming control of the LED light group; the data communication between the master controller and the slave controller is carried out through the power line; the slave controller according to the The control signal sent by the host computer outputs the corresponding PWM signal to the LED dimming module, and the output current is changed by adjusting the duty ratio of the PWM wave to achieve the dimming purpose of the LED lamp group.

2. The LED dimming circuit based on power line carrier communication according to claim 1, characterized in that: the main controller includes a single-chip microcomputer, a power supply circuit, a clock circuit, a carrier communication module, an interface circuit and an expansion interface circuit; The single-chip microcomputer described above adopts STM32, which is mainly responsible for communicating with the carrier communication module; the described power supply circuit is mainly responsible for supplying power to the main controller; the described clock circuit is mainly responsible for providing the main controller with a system reference clock; The power line is connected, and is mainly responsible for the communication between the master controller and the slave controller; the expansion interface circuit is mainly used for system expansion; the carrier communication module adopts PL3106 chip, including sending circuit, carrier coupling circuit, carrier receiving circuit and other interface circuits; the transmitting circuit is mainly responsible for amplifying the power of the modulated signal generated by the PL3106 chip; the carrier coupling circuit is mainly used for surge protection; the carrier receiving circuit is mainly responsible for effectively signal Perform filtering to improve receiving sensitivity; the other interface circuits described above are mainly responsible for the use of extended functions.

3. The LED dimming circuit based on power line carrier communication according to claim 1, characterized in that: the slave controller includes a carrier communication module; the carrier communication module adopts a PL3106 chip with a built-in 8051MCU and peripheral circuits Including a sending circuit, a carrier coupling circuit, a carrier receiving circuit and other interface circuits; the built-in 8051MCU is mainly responsible for controlling the dimming of the LED light group through PWM; the sending circuit is mainly responsible for the modulation signal generated by the PL3106 chip Power amplification and filtering; the carrier coupling circuit is mainly to couple the amplified and filtered signal to the power line and to couple the signal on the power line to the carrier receiving circuit; the carrier receiving circuit is mainly responsible for filtering the effective signal, Improve the receiving sensitivity; the other interface circuits mentioned above are mainly responsible for the use of extended functions.

4. The LED dimming circuit based on power line carrier communication according to claim 3, characterized in that: said LED dimming module uses a PT4115 chip, which is responsible for receiving the PWM dimming signal output by said 8051MCU to perform dimming on the LED lamp group. Dimming.