A switch-mode power supply (SMPS), also known as a switching converter or switching power supply, is a high-frequency power conversion device and a type of power supply. Its function is to convert a voltage at a certain level into the voltage or current required by the user through different structural forms. The input of a switching power supply is mostly AC power (such as mains power) or DC power, while the output is mostly devices that require DC power, such as personal computers. The switching power supply performs the voltage and current conversion between these two sources.
Characteristics of Switching Power Supplies
1. Small size and light weight: Because there is no power frequency transformer, the size and weight are only 20-30% of that of a linear power supply.
2. Low power consumption and high efficiency: The power transistors operate in a switching state, so the power consumption on the transistors is low, and the conversion efficiency is high, typically 60-70%, while linear power supplies only have 30-40%.
3. Simple structure and high reliability: Easy to maintain, and the current ripple rate can be easily kept relatively low.
The advantages of switching power supplies are quick and convenient power switching and effective energy saving. The disadvantages are a shorter lifespan and susceptibility to environmental factors such as humidity and temperature.
Selection Considerations for Switching Power Supplies
1. Choose the appropriate input voltage specification.
2. Choose the correct power supply: To extend the power supply's lifespan, choose a model with 30% higher rated output power.
3. Consider load characteristics: If the load is a motor, light bulb, or capacitive load, a suitable power supply should be selected to avoid overload when the current is high during operation. If the load is a motor, voltage recovery should be considered when the motor is stopped.
4. Consider the operating temperature of the power supply and whether there is additional auxiliary cooling equipment. Power supplies operating in high ambient temperatures need to have their output reduced. Refer to the derating curve of output power based on ambient temperature.
5. Select each function according to application requirements.
6. Select the required safety regulations and electromagnetic compatibility (EMC) certifications.
Switching power supplies have a wide range of applications, including household appliances, computers, electronic equipment, and automotive electronic systems.
Switching Power Supply Manufacturers Introduction
When purchasing a switching power supply, factors such as voltage and heat dissipation must be considered. It is essential to choose products from reputable manufacturers. The following are top-ranked switching power supply manufacturers whose products are all of excellent quality.
Schneider Electric
Founded in France in 1920, Schneider Electric is a global expert in energy management and a leading brand in power distribution equipment. Its modular design and global service network make it suitable for large-scale projects in mining, subways, and other industries. It supports parallel expansion and access to energy management platforms, with a failure rate of <1%.
Siemens
Founded in Germany in 1847, Siemens is a Fortune 500 company. Its switching power supplies feature strong redundancy and fault protection, globally unified quality standards, and are suitable for high-end equipment with high requirements for system compatibility and long lifecycle support.
Idealplusing
Idealplusing is a Chinese manufacturer. It focuses on the research, development, sales, and service of DC-DC power modules, AC-DC rectifier modules, DC-AC inverters, AC power supplies, DC power supplies, LED power supplies, chargers, and rectifier systems, providing customized, efficient, reliable, and cost-effective power solutions for various industries.
Chaoyang Power (4NIC)
Chaoyang Power (4NIC) is a long-established military power supply base under China Aerospace Science and Industry Corporation (CASIC). With over 30 years of experience in voltage regulation, constant current, and pulse power supplies, its switching power supplies have passed multiple military and aerospace certifications and are suitable for high reliability and harsh environment requirements.
