Intelligent lighting refers to the use of computer, wireless communication data transmission, spread spectrum power carrier communication technology, computer intelligent information processing and energy-saving electrical control technology to form a distributed wireless telemetry, remote control, remote control system to achieve lighting equipment Intelligent control. Intelligentization is the future development direction of LED lighting. The intelligent LED lamp has the functions of intensity adjustment of light brightness, color temperature control, soft start of light, timing control, scene setting and so on.
Although smart LED lights have many advantages, there are still some problems that are complicated in scheme, short in life, and high in cost. Based on the consideration of the above problems, this product's solution selects a multi-channel high-voltage constant current drive IC with high integration and digital interface as the driving power source for high-voltage lamp beads, and realizes LED with low-power Bluetooth 4.0BLE module. Intelligent control and communication functions of the lights.
First, the overall plan of intelligent LED lights
Intelligent LED lights are designed through hardware and software to achieve: 1) Color adjustment. 16 million colors are freely selectable, and the required color can be generated according to user requirements; 2) brightness adjustment. The amount of dimming is between the total off (0) and full bright (255) values, that is, there are 256 levels of brightness adjustment; 3) color temperature adjustment. Output single-channel yellow LED control, adjust the yellow light brightness control color temperature according to the required application scene, provide cool white and warm white two-color lighting; 4) Provide APP software supported by smart phone to realize Bluetooth wireless control LED light; 5) Select mobile phone Different scene modes preset in the APP meet the lighting color requirements of different scenes; 6) Bulbs with a total power of no more than 9 W can be wirelessly connected and controlled by Bluetooth.
According to the above functional requirements, the designed system is shown in Figure 1. It mainly includes the following functional units: Power management, providing different sizes and types of power supplies required by the system; Bluetooth 4.0BLE control module, implemented between the smartphone and the smartphone The wireless communication also communicates with the high-voltage linear constant current drive IC through the IIC protocol to complete various control functions. The high-voltage linear constant current drive module receives the command of Bluetooth 4.0BLE, outputs constant current through PWM mode, and outputs current through the output. The size of the color change control for high voltage RGB LED bead combinations.
Second, the hardware design of intelligent LED lights
2.1 Power supply design
The system requires two power supplies, a 3.3 V power supply for the Bluetooth 4.0BLE module and a DC 220 V power supply for the high voltage lamp bead. AC 220 V power input, after full-wave rectification and filtering, becomes DC voltage. Ideally, the average voltage is around 198 V and needs to be stepped down by a step-down AC/DC chip to a 3.3 V DC output to power Bluetooth 4.0BLE. The maximum operating current of the Bluetooth 4.0BLE module loop does not exceed 10 mA. In design, considering the derating 70% design, the maximum output current of the LDO buck chip is about 15 mA.
The constant voltage power switch chip SM7205, which is a low-power switching power supply, is used as a step-down AC/DC. The output voltage is 3.3 V at a full voltage of 90 Vac to 264 Vac, and its maximum output current is as high as 1.2 A. Under different loads, the requirements of the Bluetooth 4.0BLE power supply are met within the range of constant voltage accuracy. In order to ensure the output accuracy of the power supply, resistors R1 and R2 select a chip resistor with a precision of 1%. In order to enhance EMC performance, lightning protection and surge protection circuits are required in the 220 V AC input circuit (see Figure 2).
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