Main products: power adapter, medical power, LED power, charger and so on.
Shenzhen Lianyunda Electronics Co., Ltd. is committed to doing a good job in power supply products, and sincerely welcomes customers to contact us by phone or email.
Power adapter development trend
At present, the power adapter on the market utilizes power electronics technology to control the output voltage by adjusting the ratio of the turn-on and turn-off time of the switching transistor, and using the power semiconductor device as a switch to adjust the output voltage.
The first stage of the development of China's power adapters was before 1976, which was the initial stage of the development of China's switching power supply and power adapter industry. The relevant power supply technologies are not mature, and there is no systemization and standardization.
External power supply was mainly based on linear power supply before the 1980s. The biggest disadvantage of linear power supply is that it is larger in size and weight than the power adapter, and the efficiency is low, but the advantage is stable operation and simple circuit, but it is particularly bulky, rough and inconvenient 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 notebooks. Its pioneering work opened a new page in the history of power adapter development in the world, and became the world's first independent notebook power adapter. Because the power supply of the switching power supply technology is externally placed, the notebook does not need to consider the heat generated by the power conversion to gather in the notebook itself, and the power adapter is convenient to carry, thereby effectively improving the commercialization and popularization of the notebook computer. It has been used today.
Since Toshiba has turned on the notebook power supply to fully realize the switching power supply, the notebook manufacturers have taken the lead in completing the computer power generation. In the 1990s, the power adapter has been widely used in various electronic and electrical equipment, program-controlled switches, communication, power detection equipment power supply and Control device power.
The power adapter is generally composed of a pulse width modulation (PWM) control IC and a MOSFET, and is one of the representative of the current regulated power supply.
In 1989, China's standardized power supply production enterprises have grown to 171, with more than 340 product specifications and an annual output of more than 600,000 power supplies.
At this stage, with the gradual rapid development of the power industry, the vast number of power technology workers urgently need to break the original closed state and understand the outside world. Since the mid-1970s, power technology personnel spontaneously organized technical exchanges. In 1978, the first national power technology exchange seminar was held. In 1983, the China Power Supply Society was established. In 1986, it was approved by the State Science and Technology Commission.
In the late 1990s, a series of standards in Europe regarding power conversion efficiency and standby power consumption pushed the power adapter to an unreachable height. The high frequency of the power adapter makes it develop direction, 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 of high-tech products. Lightweight. 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 pushed the power adapter to another new peak. The power adapter was brought to the light and stylish direction, so the appearance of the power adapter no longer felt like The previous appearance was a single and less aesthetically pleasing impression.