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All colleagues unite and focus their efforts to write a new chapter of developmentThe difference between a power adapter and a switching power supply
所属分类： Industry News
发布时间：2020-06-09
With the advancement and innovation of power electronics technology, the power‑supply market has grown rapidly, and technological breakthroughs continue to emerge. This cost‑parity point is steadily shifting toward lower‑power output applications, opening up vast opportunities for power adapters and switching power supplies. Switching power supplies and power adapters are now ubiquitous, serving both household and industrial applications, bringing tremendous convenience to our daily lives. Their expanding range of uses—particularly in high‑tech sectors—has driven the miniaturization and lightweight design of cutting‑edge products. Yet many people wonder: what exactly is a power adapter, and how does it differ from the switching power supplies we use? Today, we’ll explore the key distinctions between power adapters and switching power supplies.
Switching power supply:
Switching power supply It is a method of converting 220V AC into low‑voltage DC, distinct from traditional line‑frequency transformers. Power supplies that employ this switching‑mode voltage‑conversion technology are known as switch-mode power supplies; both chargers and power adapters today utilize switch-mode technology. At present, switch-mode power supplies, with their compact size, light weight, and high efficiency, are widely used in virtually all electronic devices and have become an indispensable power‑supply solution in the rapid development of the modern information‑electronics industry.
In addition, the development and application of switch-mode power supplies are of great significance for energy conservation, resource efficiency, and environmental protection. The power electronic devices commonly used in switch-mode power supplies include diodes and IGBTs (insulated-gate bipolar transistors). Diodes are employed in the input rectifier and soft-start circuits, while GTRs, which are difficult to drive and operate at low switching frequencies, have been gradually replaced by IGBTs and MOSFETs.
Power adapter:
Power adapter It is a power‑supply conversion device for small, portable electronic devices and electrical appliances, typically comprising a housing, a power transformer, and a rectifier circuit. Based on output type, it can be classified as AC‑output or DC‑output; based on connection method, it can be wall‑mounted or desktop‑type. It is widely used in equipment such as cordless telephone handsets, game consoles, voice‑recording devices, personal audio players, notebook computers, and cellular phones. Power adapters are generally versatile: they not only supply power but can also charge electronic devices—just like the adapter for a laptop, which can both charge and power the computer.
Most laptop power adapters can automatically detect AC input voltages ranging from 100 to 240 V (50/60 Hz). Virtually all laptops use external power supplies, connected to the main unit via a single cable, which helps reduce the size and weight of the laptop itself; only a very small number of models incorporate the power supply internally. Each power adapter features a nameplate that specifies key specifications, including power rating, input and output voltages, and current ratings.
As you can see from the above, both power adapters and switching power supplies are closely intertwined with our daily lives, so it’s important to promote basic knowledge about power supplies in our everyday routines. We look forward to the editor sharing more insights on power adapters in the next installment.