68628-610H

　　As the pioneer of global lighting tools, incandescent lamps are gradually being replaced by the new generation of lighting tools, light-emitting diodes (LEDs), and are gradually fading out of peopl...[Details]

After the switch SA1 is switched, the device can automatically control the lighting in corridors and public toilets in public places, so that the lighting is turned off during the day, and the ligh...[Details]

introduction STM32 is a 32-bit microcontroller series based on the ARM core Cortex-M3 launched by ST (STMicroelectronics). The Cortex-M3 core is specially designed for low-power and price-sens...[Details]

reference: http://liu1227787871.blog.163.com/blog/static/205363197201242393031250/ http://blog.csdn.net/cumtgao/article/details/8649006 http://www.360doc.com/content/12/0424/17/9159905_206213245.s...[Details]

introduction 为了以更低的功耗获得更高的速度和更佳的性能，要求 电源 电压越来越低，瞬态性能指标越来越高，因此对 开关电源 提出了越来越高的要求。用原有的电路拓扑及整流方式已不能满足现在的要求，为了适应IC芯片发展的需要，人们开始研究新的电路拓扑。因为输出电压很低，所以，同步整流自然成为这种低压大电流电源的必然选择，考滤到产品的复杂程度及产品可靠性，同步整流一般选择自驱动同步整流，...[Details]

Researchers at the University of Manchester in the UK have created a new one-dimensional system that has successfully achieved robust superconductivity in high magnetic fields. This is a major brea...[Details]

Under the influence of the export control policy initiated by the US government, many international semiconductor companies have been "passively" caught in the crossfire. Policies and regulations ...[Details]

　　A long time ago, the service life of cars in my country was 15 years. Once a car reached 15 years old, it had to be scrapped. However, the policy was later changed. As long as the car does not exce...[Details]

The light beam detection ensures normal operation and avoids malfunction. Since the photoelectric float uses a photoelectric reflector, an optical detection device, the float is reliable,...[Details]

Sino-US trade frictions continue, emergencies (such as the new crown epidemic) are unexpected, new technologies such as artificial intelligence, 5G, and the Internet of Things are booming... my count...[Details]

Knowledge about frequency converters and their impact on motors requires a clear understanding of the motor's efficiency and temperature rise, the motor's insulation strength, and the impact of har...[Details]

Definition and composition of sensors 　　The concept of sensor comes from the word "sensor". In order to study natural phenomena, it is far from enough to rely solely on the five senses to obtain ex...[Details]

Insufficient production capacity, tight inventory, and continued price increases of overseas chips Affected by the global epidemic, overseas chip supplies have become tight since the secon...[Details]

       The mobile phones of the future are generally considered to be integrated devices without holes, and current devices are also in this trend. 　　As a result, we see the rise of "full screen". As...[Details]

Ultrasonic cleaning machine power supply main circuit Figure 1 Ultrasonic cleaning machine power supply main circuit The main circuit of the ultrasonic cleaning machine power supply adopts a ful...[Details]