The electrical symbol of switching power supply is generally expressed by the electrical symbol of rectifier, and the text symbol is U. Switching power supply is a kind of power supply that utilizes modern power electronic technology to control the ratio of switching time of switching on and off to maintain a stable output voltage.
What is a switching power supply
1, the main features
Switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communications equipment, power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, liquid crystal displays, LED lamps and lanterns, telecommunications equipment, audio-visual products, security monitoring, communication equipment. audio-visual products, security monitoring, LED strip lights, computer chassis, digital products and instruments class and other fields.
Small size and light weight: Because there is no industrial frequency transformer, the volume and weight is only 20-30% of linear power supply.
Small power consumption, high efficiency: power transistors work in the switching state, so the power consumption on the transistor is small, the conversion efficiency is high, generally 60 to 70%, while the linear power supply is only 30 to 40%.
2, working conditions
Switching: power electronics devices work in the switching state rather than the linear state
High-frequency: power electronics devices work in the high-frequency rather than low-frequency close to the frequency of the work
DC: switching power supply output is DC rather than AC
3, people in the field of switching power supply technology is the side of the development of related power electronics, while the development of switching inverter technology is the side of the development of related power electronics devices, the side of the development of switching inverter technology. In the field of switching power supply technology, people are developing related power electronic devices, while developing switching frequency conversion technology, the two promote each other to promote the switching power supply to more than double-digit growth rate each year toward the direction of light, small, thin, low noise, high reliability, anti-interference development. Switching power supply can be divided into two categories: AC/DC and DC/DC.