Development and history of power adapters

The external power supply was mainly based on linear power supply before the 1980s. The disadvantage is that the volume and weight are larger than the power adapter, and the efficiency is low, but the advantage is stable operation, simple circuit, but not convenient to carry. So in the mid-1980s, Toshiba of Japan took the lead in using switching power supply technology for the external power supply of laptop, becoming the world’s first independent laptops power adapter. Because the power supply using switching power supply technology is external, there is no need to consider the heat generated by the power conversion to accumulate in the laptop itself. And the power adapter is easy to carry, so it effectively improves the commercialization and popularization of the laptop.

Since Toshiba has turned on laptop power to fully realize switching power supply, it has become a role model for power adapter applications and other industries. In the 1990s, power adapters have been widely used in a variety of electronic and electrical equipment, program-controlled switches, communications, power detection equipment power and control equipment power. The power adapter is typically composed of a pulse width modulation (PWM) control IC and a MOSFET.

In the late 1990s, a series of standard on power conversion efficiency and standby power consumption in Europe pushed power adapter to a higher level. The high frequency of the power adapter is the direction of its development. The high frequency makes the switching power supply miniaturized, and the power adapter enters a wider range of applications, especially in the high-tech field, which promotes the miniaturization and portability of the product. In addition, the development and application of power adapters are of great significance in terms of energy conservation, resource conservation and environmental protection.

In 2001, Apple developed a stylish and lightweight power adapter, which made the power adapter looks more beautiful. In 2010, the power adapter developed and mass-produced the world’s first universal laptop charger that is fully compatible with the world’s major brands of laptop computers. Laptop power adapters have entered a truly universal era.

It can be said that the development of power adapters and laptops have a close relationship, and laptop power adapters have promoted the development of the entire power adapter. The development direction of power adapters is high frequency, high reliability, low consumption, low noise and anti-interference. Since the key technology of the power adapter is light, small and thin, the power adapter manufacturers are committed to the simultaneous development of new high-intelligent components, especially to improve the loss of the secondary rectifier device, and in the Mn -Zn Increases technological innovation in materials, and the miniaturization of capacitors are also a key technology. Power adapter wholesale manufacturers reduce the stress on the device by reducing the operating current and so on, which greatly increases the reliability of the product.