Lamp panel control circuit

Abstract

The utility model provides a lamp panel control circuit, which comprises a voltage conversion module, a control unit, an Ethernet module and at least one LED unit, an input end of the voltage conversion module is connected with a power supply, an output end of the voltage conversion module is connected with a power supply input pin of the control unit, and the LED unit is connected with a control signal output end of the control unit. And the Ethernet module is connected with a signal control signal input end of the control unit. According to the utility model, secondary development can be carried out through the Ethernet, autonomous control is realized, the control is simple and convenient, and the integration level is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to LED lamp control technical field, especially relate to a lamp panel control circuit. BACKGROUND

[0002] Because LED display screen has energy -conserving, long service life, easy installation and so on advantage, the application on the market is extremely extensive. But current existing LED lamp panel usually does not have secondary development function, cannot be connected control through ethernet, is not conducive to secondary development utilization. SUMMARY

[0003] Therefore, the utility model discloses a lamp panel control circuit to solve the problems in the background art.

[0004] The utility model discloses a lamp panel control circuit, which is characterized by comprising a voltage conversion module, a control unit, an Ethernet module and at least one LED unit.

[0005] Preferably, the Ethernet module is connected to the control unit through an RS232 communication unit.

[0006] Preferably, the LED unit is a WS2812 light strip, and the control unit is a single-chip microcomputer.

[0007] Preferably, the single-chip microcomputer is connected to a crystal unit, which is used to set the clock frequency.

[0008] Preferably, the voltage conversion module includes a 24V-to-5V voltage conversion circuit and a 5V-to-3.3V voltage conversion circuit.

[0009] Preferably, the Ethernet module is a ZLSN2003B.

[0010] Preferably, the single-chip microcomputer is further connected to an LED indication circuit.

[0011] Compared with the prior art, the utility model discloses a singlechip controls LED lamp panel, realizes the light mode such as constant light, flash screen and connects the ethernet module through RS232 communication unit, utilizes the ethernet module to realize wired connection control, thereby can be used for secondary development, realizes independent control. High degree of integration and convenient control, low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the principle block diagram of lamp panel control circuit in the embodiment.

[0013] Figure 2 It is the circuit diagram of lamp panel control circuit in the embodiment. DETAILED DESCRIPTION

[0014] The following is the specific embodiment of the utility model and is further described the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0015] As Figure 1 Shown, a kind of lamp panel control circuit includes voltage conversion module, control unit, ethernet module and at least one LED unit, the input end of voltage conversion module is connected power supply, the output end of voltage conversion module is connected the power supply input pin of control unit, LED unit connects the control signal output end of control unit, ethernet module and the signal control signal input end of control unit are connected.

[0016] Specifically, as Figure 2 Shown, control unit uses the singlechip of model STM32F103C8T6TR and its peripheral circuit composition. The 17th pin and the 18th pin of singlechip are connected with one WS2812 lamp band respectively. WS2812 is a kind of intelligent control LED with integrated control circuit and RGB LED, its control signal is based on single-line communication, and the "0" and "1" of data are expressed by specific time sequence. "0" signal: high level time is about 0.4 microsecond, and low level time is about 0.85 microsecond. "1" signal: high level time is about 0.8 microsecond, and low level time is about 0.45 microsecond. The color data of each LED is 24 bits, wherein 8 bits represent red, 8 bits represent green, and 8 bits represent blue, and are arranged in the order of GRB. Different control signals can be output by singlechip to realize the independent control of two lamp strips to display different states.

[0017] The 5th pin and the 6th pin of the single-chip microcomputer are connected with the crystal oscillator, thereby generating the clock frequency required by the single-chip microcomputer. The 12th pin and the 13th pin of the single-chip microcomputer are connected with the RS232 chip through the interface circuit, the RS232 chip is used as a communication unit to realize the connection between the single-chip microcomputer and the Ethernet module, the 11th pin and the 12th pin of the RS232 chip are connected with the 6th pin and the 7th pin of the Ethernet module through the interface circuit. The Ethernet module is composed of ZLSN2003B chip and its peripheral circuit, thereby providing a connection interface for secondary development.

[0018] The control process of the single-chip microcomputer on the WS2812 light strip is as follows:

[0019] a. Configure SPI interface

[0020] The SPI interface of the single-chip microcomputer is configured, and a suitable clock frequency is set. For example, if an 8MHz SPI clock is used, the time for each bit is 125 nanoseconds.

[0021] b. Data conversion

[0022] The data to be sent to the WS2812 needs to be converted into a format that can be sent by SPI. For example, the "0" signal and the "1" signal of the WS2812 can be converted into the following SPI data:

[0023] "0" signal: converted into two SPI bytes, 0b1000 and 0b0000 respectively.

[0024] "1" signal: converted into two SPI bytes, 0b1110 and 0b0000 respectively.

[0025] This conversion can be realized by lookup table or other methods.

[0026] c. Send data

[0027] The converted data is sent out through SPI. Since the WS2812 is a cascading structure, each LED will automatically forward the unprocessed data to the next LED after receiving the complete 24-bit data.

[0028] The power supply part is composed of voltage conversion modules, including 24V to 5V voltage conversion circuit and 5V to 3.3V voltage conversion circuit. The power input 24V voltage is converted into 3.3V voltage through 24V to 5V voltage conversion circuit and 5V to 3.3V voltage conversion circuit in turn, and then delivered to the control unit, RS232 communication unit and Ethernet module. Through the above voltage conversion circuit, stable voltage supply is realized, thereby ensuring the stability of circuit operation.

[0029] Further, the 29th pin of the single-chip microcomputer in the embodiment is also connected with an indicating lamp circuit, and the running state of the single-chip microcomputer is displayed through an LED indicating lamp, thereby playing a warning and indicating role.

[0030] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A lamp panel control circuit, characterized by, The application relates to a voltage conversion module, a control unit, an Ethernet module and at least one LED unit, wherein the input end of the voltage conversion module is connected with a power supply, the output end of the voltage conversion module is connected with the power input pin of the control unit, the LED unit is connected with the control signal output end of the control unit, and the Ethernet module and the signal control signal input end of the control unit are connected.

2. A lamp panel control circuit according to claim 1, characterized in that The Ethernet module is connected with the control unit through an RS232 communication unit.

3. A lamp panel control circuit according to claim 1 or 2, characterized in that The LED unit is a WS2812 lamp strip, the control unit is a single-chip microcomputer, and the single-chip microcomputer is connected with the WS2812 lamp strip through an SPI interface.

4. A lamp panel control circuit according to claim 3, characterised in that, The single-chip microcomputer is connected with a crystal unit, and the crystal unit is used for setting a clock frequency.

5. A lamp panel control circuit according to claim 2, characterized in that The voltage conversion module comprises a 24V-to-5V voltage conversion circuit and a 5V-to-3.3V voltage conversion circuit; the 24V power supply is converted into 3.3V voltage through the 24V-to-5V voltage conversion circuit and the 5V-to-3.3V voltage conversion circuit in sequence and then is delivered to the control unit, the RS232 communication unit and the Ethernet module.

6. A lamp panel control circuit according to claim 1 or 2, characterized in that The Ethernet module is a ZLSN2003B.

7. A lamp panel control circuit according to claim 3, wherein, The single-chip microcomputer is further connected with an LED indication circuit.

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