Energy-saving and emission reduction have become a global priority. As one of the most power-hungry components in outdoor LED displays, ensuring energy efficiency without compromising brightness is a major challenge for the industry. Under conditions where brightness remains constant (i.e., the LED current doesn't change), lowering the supply voltage becomes the key to achieving energy savings. Currently, most LED constant current driver chips on the market have an inflection point voltage of around 0.7V at 20mA. Considering line losses and other factors, the supply voltage is typically set at 5V. To address this issue, Mingwei Electronics has introduced an innovative solution: the SM16227, a dedicated constant current chip designed specifically for energy-efficient LED displays.
**Key Features of SM16227:**
- **Ultra-low inflection point voltage:** At just 0.2V @ 20mA, it allows for a significant reduction in supply voltage, potentially saving up to 24% in power consumption.
- **32-level current gain adjustment:** Enables precise white balance control and seamless brightness adjustments based on ambient light, without losing grayscale detail.
- **DS-PWM protocol:** Enhances refresh rate and screen utilization, making it ideal for high-speed applications. In a real-world example, a 2-sweep system achieved a refresh rate of up to 7680 Hz, resulting in clear images even with fast shutter speeds.
- **Built-in column elimination and color cast compensation:** Helps eliminate issues like image smearing and dark areas caused by high scan rates, improving overall display quality.
**Case Study 1: Guangxi Project**
A project in Guangxi used P10 modules with 2-sweep technology, a brightness of 7500cd, and a total area of 96.768 square meters. By using the SM16227 chip along with standard wiring and low-Rds(on) MOSFETs, the power supply was optimized to 3.8V instead of the traditional 5V. The results were impressive:
- Traditional 5V system: 85.05 kW
- SM16227-based 3.8V system: 64.638 kW
Assuming an average electricity cost of ¥1 per kWh and 24/7 operation, the annual savings amounted to approximately ¥178,800—proving the effectiveness of the energy-saving design.
**Case Study 2: Grille Screens and Glass Curtain Walls**
In applications such as grille screens or glass curtain walls, structural constraints can lead to uneven voltage distribution across the display. This often causes overheating or color deviation due to insufficient inflection point voltage. The SM16227's low threshold voltage effectively solves these issues, ensuring consistent performance and reducing thermal stress on the display.
The SM16227 not only lowers power consumption and operating temperature but also enhances the longevity of outdoor LED displays. With its advanced features and cost-effective design, it offers a reliable and efficient solution for modern LED display systems. Whether for large-scale installations or specialized applications, the SM16227 stands out as a top choice for energy-conscious and high-performance displays.
Water Heater Breaker
Leakage protector, also known as leakage switch, is a new type of electrical safety device, mainly used for:
(1) Prevent electric shock accidents caused by electrical equipment and electrical circuit leakage;
(2) Preventing single-phase electric shock accidents during electricity use
(3) Timely cut off single-phase grounding faults in the operation of electrical equipment to prevent fire accidents caused by leakage
(4) With the improvement of people's living standards and the continuous increase of household appliances, personal electric shock and fire accidents caused by defects, improper use, and inadequate safety measures of electrical equipment in the process of using electricity have brought undue damage to people's lives and property. The emergence of leakage protectors provides reliable and effective technical means for preventing various accidents, timely cutting off power, and protecting equipment and personal safety.
The leakage protector should meet the following technical requirements
(1) The sensitivity of electric shock protection should be correct and reasonable, and the starting current should generally be within the range of 15-30 milliamperes
(2) The action time of electric shock protection should generally not exceed 0.1 seconds
(3) The protector should be equipped with necessary monitoring equipment to prevent it from losing its protective effect when the operating state changes. For example, for voltage type electric shock protectors, a neutral grounding device should be installed.
ZHEJIANG QIANNA ELECTRIC CO.,LTD , https://www.traner-elec.com
