The first stage of China s power adapter development was before 1976, which was the initial stage of the development of China s switching power supply and power adapter industry. All related power supply technologies are immature, not systematic and standardized. The external power supply was mainly linear power supply before the 1980s. The biggest disadvantage of the linear power supply is that the volume and weight are larger than the power adapter, and the efficiency is low, but the advantages are stable operation and simple circuit, but it is particularly heavy, rough and inconvenient to carry.

In the mid-1980s, Japan’s Toshiba took the lead in applying switching power supply technology to external power supplies for notebooks. Its pioneering work created a new page in the world’s power adapter development history and became the world’s first independent notebook power adapter. Because the power supply of the switching power supply technology is used externally, the notebook does not need to consider the heat generated by the power conversion to concentrate on the notebook itself, and the power adapter is easy to carry, and it has effectively improved the commercialization and popularization of notebook computers. It has been used to this day.

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Since Toshiba turned on the notebook power supply and fully realized the switching power supply, notebook manufacturers have fully followed suit after the first completion of the computer power supply replacement. In the 1990s, power adapters have been widely used in various electronic and electrical equipment, program-controlled switches, communications, power testing equipment and power supplies. In the power supply of the control device.

At this stage, with the gradual and rapid development of the power supply industry, the majority of power supply science and technology workers urgently need to break the original closed state and understand the outside world. Since the mid-1970s, power supply technicians have spontaneously organized technical exchanges. The first national power supply technology exchange seminar was held in 1978. The Chinese Power Supply Society was established in 1983, and it was approved by the National Science and Technology Commission in 1986. At the end of the 1990s, Europe put forward a series of standards on power conversion efficiency and standby power consumption, pushing power adapters to a height that cannot be surpassed. The high frequency of the power adapter makes its development direction, and the high frequency makes the switching power supply miniaturization, and makes the power adapter enter a wider range of application fields, especially the application in the high-tech field, which promotes the miniaturization and miniaturization of high-tech products. Lightweight. In addition, the development and application of power adapters are of great significance in saving energy, saving resources and protecting the environment.

In 2001, Apple developed a stylish and lightweight power adapter, which pushed the power adapter to another new peak. The power adapter was brought to the direction of lightness and fashion by the trend, so that the appearance of the power adapter no longer looks like it. The previous appearance was single and not very beautiful.

                                                                                                                                                                                                                                                                                                                                             2022-12-2 SUKI