CN205356737U - LED lamp controller - Google Patents

Abstract

The utility model discloses an LED lamp controller, which comprises an RS485 communication module, a microcontroller MCU module, a relay switch module, a dimming module and a power supply module. The utility model stores a unique ID number in the microcontroller MCU module of each lamp, and transmits the command to the designated LED lamp through the RS485 bus, so that any lamp can be switched and dimmed, and Collect the voltage, current, power and other parameters of LED lamps, so as to realize the separate control of single lamps in the intelligent lighting control system.

Description

A kind of LED lighting controller

technical field

The utility model relates to the field of lamp control, in particular to an LED lamp controller.

Background technique

With the rise of night scene facade lighting of urban landmarks in my country, the use of energy-saving, controllable, and colorful smart lights will inevitably lead to technological reforms, so the smart lighting control system will emerge as the times require. The current intelligent lighting control system generally adopts the intelligent lighting control system based on RS485 bus control, which is a master-slave bus lighting control system that connects various types of controllers on the RS485 bus through a custom communication protocol and is managed by the master. .

In the existing intelligent lighting control system based on RS485 bus control, the control method of its lamps is the loop control method, which can only control the simultaneous switching and dimming of all lamps in the entire loop, and cannot realize the control of a single lamp .

Utility model content

The purpose of the utility model is to provide a controller for LED lamps, which can separately control the single lamps in the intelligent lighting control system.

In order to achieve the above object, the utility model adopts the following technical solutions:

A LED lighting controller, including RS485 communication module, microcontroller MCU module, relay switch module, dimming module and power supply module; The microcontroller MCU module is connected in communication, the output terminals of the microcontroller MCU module are respectively connected to the control input terminals of the relay switch module and the dimming module, and the output terminals of the relay switch module and the dimming module All are connected with LED lamps; the microcontroller MCU module stores an ID number corresponding to the LED lamps, and the ID numbers of each LED lamp in the same intelligent lighting control system are different.

The RS-485 interface chip of described RS485 communication module adopts SN75LBC184 chip; Carry out complete electric isolation by isolation circuit between the one-chip computer of described RS485 communication module and this RS-485 interface chip; The reset terminal of described microcontroller MCU module There is an external watchdog circuit connected.

An isolation circuit is connected between the output terminal of the microcontroller MCU module and the control input terminal of the relay switch module.

The dimming module adopts a digital dimming circuit.

After adopting the above scheme, the utility model is a kind of LED lamp controller, by storing a unique ID number in the microcontroller MCU module of each lamp, the signal is transmitted through the RS485 bus, and the command is transmitted to the designated LED lamp. Realize switching and dimming any lamp, and collect parameters such as voltage, current, and power of LED lamps, so as to realize separate control of individual lamps in the intelligent lighting control system.

Description of drawings

Fig. 1 is the circuit principle block diagram of the present utility model;

Fig. 2 is the circuit principle diagram of microcontroller among Fig. 1;

Fig. 3 is the circuit principle diagram of RS485 communication module in Fig. 1;

Fig. 4 is the schematic circuit diagram of the relay switch module in Fig. 1;

Fig. 5 is a schematic circuit diagram of the dimming module in Fig. 1;

FIG. 6 is a schematic circuit diagram of the power module in FIG. 1 .

detailed description

The utility model is a LED lighting controller, as shown in Figure 1, including RS485 communication module 1, microcontroller MCU module 2, relay switch module 3, dimming module 4 and power module 5; The controller provides working power, the RS485 communication module 1 communicates with the microcontroller MCU module 2, and the output terminals of the microcontroller MCU module 2 are respectively connected to the control input terminals of the relay switch module 3 and the dimming module 4, and the relay switch module 3 and the dimming module The output terminals of the optical module 4 are all connected to the LED lamps 6; an ID number corresponding to the LED lamps 6 is stored in the microcontroller MCU module 2, and the ID numbers of each LED lamp in the same intelligent lighting control system are different.

The microcontroller MCU module 2 uses the MCU U1 (NUC100LC1BN) of Nuvoton's NUC100 series of Taiwan, China. The NUC100 series is a 32-bit single-chip microcomputer with a built-in ARMcortex-M0 core, which is used for industrial control and related applications that require rich signal communication interfaces. application occasions. The highest external clock can run up to 50MHZ, with 32K/64K/128K bytes built-in Flash memory, 4K/8K/16K bytes built-in SRAM. And built-in timer, watchdog timer, RTC, PDMA, UART, SPI/SSP, I2C, I2S, PWM timer, GPIO, 12-bit ADC, analog comparator, low voltage detection and energy saving detection functions. The circuit schematic diagram of the microcontroller MCU module 2 is shown in FIG. 2 .

One of the more commonly used networks in the field of industrial control and measurement is the industrial control equipment network composed of RS-485 communication interfaces on the physical layer. This communication interface can easily form a control network with many devices. Judging from the current analysis of many solutions for medium and long-distance communication between single-chip microcomputers, the RS-485 bus communication mode is widely used in instruments, intelligent Sensor distributed control, building control, monitoring alarm and other fields. However, the RS485 bus has shortcomings such as self-adaptation and weak self-protection functions. Many products often have failures such as communication failures or even system paralysis in the processing of some details. In the utility model, the RS485 communication module 1 is optimized to avoid the above-mentioned question. details as follows:

In RS485 communication module 1, as shown in Figure 3, the model of RS-485 interface chip U2 is SN75LBC184. This chip uses a single power supply Vcc, and the voltage can work normally within the range of +3~+5.5V. Compared with ordinary RS-485 chips, it can not only resist the impact of lightning but also withstand the impact of electrostatic discharge up to 8kV. The chip integrates 4 transient overvoltage protection tubes, which can withstand transient pulse voltage up to 400V. Therefore, it can significantly improve the reliability of preventing lightning damage to the device. For some sites with harsh environments, it can be directly connected to the transmission line without any additional protective components. The chip also has a unique design. When the input end is open, its output is high level, which can ensure that the normal operation of the system will not be affected when the receiver input cable has an open circuit fault. In addition, its input impedance is twice the standard input impedance of RS485 (≥24kΩ), so 64 transceivers can be connected to the bus. The limited slope drive is designed inside the chip, so that the edge of the output signal will not be too steep, so that too many high-frequency components will not be generated on the transmission line, thereby effectively suppressing electromagnetic interference.

In addition, in the RS485 communication module 1, the four-in-one photocoupler U3 (TLP521) completely electrically isolates the single-chip microcomputer U1 and the RS-485 interface chip U2, so that there is no connection between the single-chip microcomputer U1 and the RS-485 interface chip U2. The electrical connection improves the reliability of the work. The basic principle is: when the 19th pin PC1=0 of the single-chip microcomputer U1, the light-emitting diode of the photocoupler U3 lights up, the photosensitive transistor is turned on, and the high voltage (+5V) is output, and the DE terminal of the RS485 interface chip U2 is selected to allow sending. When the 19th pin PC1=1 of the single chip microcomputer U1, the light-emitting diode of the photocoupler U3 does not emit light, the phototransistor does not conduct, and outputs a low voltage (0V), and the RE terminal of the RS485 interface chip U2 is selected to allow reception. The principles of the R terminal (receiving terminal) and D terminal (transmitting terminal) of the RS485 interface chip U2 are similar to the above.

In the half-duplex communication system built by the RS-485 bus, only one node can be in the sending state and send data to the bus at any time in the entire network, and all other nodes must be in the receiving state. If there are 2 nodes or more than 2 nodes sending data to the bus at the same time, it will cause the data sending failure of all senders. Therefore, in the hardware design of each node of the system, efforts should be made to avoid bus data conflicts caused by the node sending data to the bus due to abnormal conditions. Take the NUC100 series single-chip microcomputer as an example, because when the system is reset, the I/O port outputs high level, if the I/O port is directly connected to the driver enable terminal DE of the RS-485 interface chip, it will reset the MCU Make DE high during this period, so that this node is in the sending state. If other nodes on the bus are sending data at this time, the data transmission will be interrupted and fail, and even cause the entire bus to be blocked due to the failure of a certain node, which will affect the normal operation of the entire system. Considering the stability and reliability of communication, in the design of each node, the sending pin of the control RS485 bus interface chip should be designed as the inverse logic of the DE end, that is, when the control pin is logic "1", the DE end is "" 0"; when the control pin is logic "0", the DE terminal is "1". In the utility model, the 19th pin PC1 of the single-chip microcomputer U1 drives the DE end of the RS485 interface chip U2 through the photocoupler U3, so that the RS485 interface chip U2 is always in the receiving state when the control pin is high or abnormally reset. In this way, the hardware can effectively avoid the influence of nodes on the entire system due to abnormal conditions. This has laid the foundation for the communication of the whole system to be reliable.

In addition, a watchdog chip U11 (MAX813L) is connected to the reset terminal of the RS485 communication module 1, which can automatically reset the program and hand over the control of the RS-485 bus when an infinite loop or other failure occurs in the node. This can ensure that the entire system will not monopolize the bus due to a failure of a certain node, causing the entire system to be paralyzed.

When a node needs to use the bus, in order to achieve reliable bus communication, it first listens to the bus when there is data to be sent. On the hardware interface, first invert the data receiving pin of the RS-485 interface chip U2 and then connect it to the interrupt pin INT1 of the single-chip microcomputer U1. In Fig. 3, INT1 is connected to the output end of photocoupler U3. When there is data being transmitted on the bus, the data receiving end (R end) of the RS-485 interface chip U2 shows a changing high and low level, and the falling edge interrupt of the microcontroller MCU module 2 generated by it is interrupted (the query mode can also be used) ), you can know whether the bus is "busy" at this time, that is, whether there are nodes on the bus that are communicating. If it is "idle", you can get the right to use the bus, which better solves the problem of bus conflicts. On this basis, you can also define the priority of various messages, so that high-priority messages can be sent first, thereby further improving the real-time performance of the system. After adopting this working method, there is no distinction between master and slave nodes in the system, and each node has equal authority to use the bus, thus effectively avoiding the heavy communication burden of individual nodes. The utilization rate of the bus and the communication efficiency of the system can be greatly improved, so that the real-time performance of the system response is also improved, and even if an individual node in the system fails, it will not affect the normal communication and normal work of other nodes. In this way, the "danger" of the system is dispersed, and the reliability and stability of the system are enhanced to some extent.

Zener tubes VD1~VD4 are signal limiting diodes, and their voltage regulator values should be guaranteed to meet the RS-485 standard. The voltage regulator tubes VD1 and VD3 take 12V, and the voltage regulator tubes VD2 and VD4 take 7V to ensure that the signal amplitude is limited to - 7～+12V, to further improve the ability to resist overvoltage. Considering the special situation of the line (such as the RS-485 chip of a certain node being broken down and short-circuited), in order to prevent the communication of other extensions in the bus from being affected, two 20Ω Resistors R1 and R2, so that the hardware failure of this machine will not affect the communication of the whole bus. In the field construction of application system engineering, because the communication carrier is a twisted pair, its characteristic impedance is about 120Ω, so when designing the line, a 120Ω matching resistor should be connected to the beginning and end of the RS485 network transmission line (as shown in the figure 3) to reduce the reflection of the transmitted signal on the line.

The relay is an electronic control device, which has a control system (also known as the input circuit) and a controlled system (also known as the output circuit), usually used in automatic control circuits, it actually uses a smaller current to control a larger An "automatic switch" of electric current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. Electromagnetic relays are generally composed of iron cores, coils, armatures, contact reeds, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating an electromagnetic effect. The moving contact and the static contact (normally open contact) are sucked together. When the coil is de-energized, the electromagnetic suction force will also disappear, and the armature will return to its original position under the reaction force of the spring, so that the moving contact and the original static contact (normally closed contact) will be attracted. In this way, it is attracted and released, so as to achieve the purpose of conducting and cutting off in the circuit. For the "normally open and normally closed" contacts of the relay, it can be distinguished in this way: the static contact that is in the off state when the relay coil is not energized is called "normally open contact"; the static contact in the on state is called For "normally closed contact".

In the utility model, the relay switch module 3 is shown in Fig. 4, the 21st pin PE5 port of the microcontroller MCU module 2 is connected to the 2nd pin of the optocoupler U5 (PC817), and the PE5 port outputs high and low levels, and through the optocoupler U5 is isolated and controls the switch of the triode QM3, thereby controlling the closing and opening of the relay KM2.

When using a relay to control a relatively large load, if there is no signal isolation, it is easy to affect the front-end circuit and cause the entire product to work unstable. In the relay switch module 2 of the present utility model, an optocoupler U5 is added to the front end of the relay KM2, so that the switch part of the relay KM2 is isolated from the microcontroller MCU module 2 controlling the relay, so as to avoid generating a small amount of backlash voltage or The current affects the microcontroller MCU module 2, so that the microcontroller MCU module 2 can work more stably, thereby making the entire controller more stable.

As shown in Figure 5, the function of the dimming module 4 is to convert the PWM wave signal output by the microcontroller MCU module 2 into a 0-10V voltage signal, and the PWM1 port of the microcontroller MCU module 2 outputs a 0-5V PWM wave signal , after being isolated by the optocoupler U7, it is converted into a PWM wave signal of 0-3.3V. The PWM wave is amplified by the transistor Q3 and input to the voltage integration amplifier U8. The voltage amplification factor is determined by the resistors R45 and R46. In this embodiment, the applied voltage The magnification is 3 times, and the capacitors C36, C37, C38, and C39 are filter capacitors. The difference between the dimming module 4 of the present invention and the existing dimming module is that most of the existing 0-10V dimming uses Analog circuit dimming means changing the output voltage by adjusting the resistance value of the resistor. The output dimming accuracy of analog dimming is relatively low. The dimming module 4 of the utility model adopts a digital method for dimming, and the dimming is performed by adjusting the duty cycle of the square wave signal, and the output dimming precision is relatively high.

As shown in Figure 6, the power supply module 5 of the present utility model is divided into four parts, the first part is: the mains AC220V is converted to a DC voltage of 15V through the power chip U6; the second part is: the DC voltage of 15V is passed through the voltage regulator chip UM4 (L78M12) into a DC voltage of 12V; the third part is: convert the DC voltage 12V into a DC voltage of 5V through the voltage regulator chip UM5 (L78M05); the fourth part is: convert the DC voltage 5V through the voltage regulator chip UM13 (SPX1117M3-3.3 ) into a DC voltage of 3.3V.

Claims (4)

1. a LED lamp controller, it is characterised in that: include RS485 communication module, microcontroller module, relay switch module, light-adjusting module and power module；Working power is provided for whole controller by described power module, described RS485 communication module and the communication connection of described microcontroller module, the outfan of described microcontroller module connects the control input of described relay switch module and described light-adjusting module respectively, and described relay switch module is all connected with LED lamp with the outfan of described light-adjusting module；Described microcontroller module memory contains No. ID corresponding to described LED lamp, and in same intelligent light control system No. ID of each LED lamp different.

2. a kind of LED lamp controller according to claim 1, it is characterised in that: the RS-485 interface chip of described RS485 communication module adopts SN75LBC184 chip；Electrically insulated completely by isolation circuit between single-chip microcomputer and this RS-485 interface chip of described RS485 communication module；The reset terminal of described microcontroller module is connected to outer watchdog circuit.

3. a kind of LED lamp controller according to claim 1, it is characterised in that: it is connected to isolation circuit between outfan and the control input of described relay switch module of described microcontroller module.

4. a kind of LED lamp controller according to claim 1, it is characterised in that: described light-adjusting module adopts digital light-adjusting circuit.