United States of America the switching frequency of the AC-DC switching power supply module?(5)

Green module power
The rapid development of computer technology has led human beings into the information society, and also promoted the rapid development of module power technology. In the 1980s, computers fully adopted switching power supplies, taking the lead in completing the replacement of computer power supplies. Then switching power supply technology has entered the field of electronics and electrical equipment one after another. With the development of computer technology, green computer and green module power supply are proposed. Green computers generally refer to personal computers and related products that are harmless to the environment. Green power refers to high-efficiency power-saving power sources related to green computers. According to the "Energy Star" plan of the United States Environmental Protection Agency on June 17, 1992 If the power consumption of a small personal computer or related peripheral equipment in the sleep state is less than 30 watts, it meets the requirements of a green computer. Improving power efficiency is the fundamental way to reduce power consumption. For a 200-watt switching power supply with an efficiency of 75%, the power supply itself consumes 50 watts of energy.

At present, the power carrier is mainly used for intelligent carrier in the home, remote meter reading system, and remote street lamp control system. The use range of the carrier frequency of power lines in my country is 9KHz ~ 500KHz, and the carrier bandwidth is 4KHz. The development of power carrier is very limited due to the change of power line impedance and the interference of power line noise. In order to increase the communication distance of the power carrier, we must move away from the power switching frequency of the circuit carrier unit. The carrier frequencies currently used in China are 115KHz and 132KHz. In this case, the switching frequency is around 60KHz for the 24V input power supply.