Recently, Dongying Jiawen Optoelectronics Co., Ltd. and Inspur Huaguang Group jointly developed a new type of AC-driven AC-LED technology, all of which have met the requirements of industrialization and declared national invention patents.
Existing LED operating modes focus on low voltage (2-4 volts) and constant DC. When urban AC power is used to drive LED lights, a variable voltage constant current power supply including buck and steady current electronic components is required. In the AC-DC conversion process, 15-30% loss is inevitable. Taking advantage of the small size of LEDs, the DC drive power module with complicated structure is often compactly installed inside the narrow lamp body together with the LED chip. The LED chip and the power source are both heat sources, so that the ambient temperature rises, thereby further Reduce the working efficiency and life of DC drive power. The life bottleneck of LED power supplies is becoming a fundamental source of many problems.
AC-LED technology completely breaks through this technical bottleneck: its basic concept is to not use extra (external chip) AC/DC conversion and rectification circuits, instead of using current limiting resistors to directly drive LEDs with AC power, avoiding the use of constant DC Loss of efficiency due to power supplies, large size, complex structure, and lifetime limitations. The application of AC-LED eliminates the traditional constant voltage and constant current power supply, removes redundant electronic components, thereby reducing the cost, and has achieved great success in the miniaturization, reliability and extended working life of LED lamps.
So far, only three companies in the United States, South Korea and Taiwan have AC-LED core technology and first-generation products. Gavin Optoelectronics' technological breakthroughs, patent applications and product development will fill the gap in AC-LED research in the mainland.
USB 2.0 is a USB interface standard released in 2000 with a theoretical maximum transmission speed of 480Mbps (about 60MB/s). The port has four cables (five cables for MicroUSB and MiniUSB), and the maximum output current is 0.5A. USB 2.0 is currently the most common version of USB port, almost all computers have USB 2.0 port, most USB devices also support USB 2.0. USB 2.0 hub. The device can provide USB high speed or full speed connection on the uplink port. The device also provides USB high-speed, full-speed, or low-speed connections on the downlink port. When the uplink port is connected to an electrical environment that supports only high-speed, full-speed, and low-speed connections, the high-speed, full-speed, and low-speed USB connections on the downlink port are enabled. When the uplink port is connected to an electrical environment that supports only full or low speed connections, the USB high-speed connection on the downlink port is disabled. USB 3.0 Hubs is higher than usb 2.0 in terms of transmitting data.
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