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Power adapter development and history

发表于2017-08-08

  1. Now we see the power adapter is the use of power electronic technology, the power semiconductor device as a switch, the control switch transistor turn-on and turn off time ratio, adjust the output voltage of a power supply.


         Before 80s, the external power supply was mainly linear power supply. The disadvantage was that the volume and weight were greater than the power adapter, and the efficiency was low, but the advantage was that the work was stable, the circuit was simple, but it was not easy to carry. So in the middle of the 80s, Japan's Toshiba pioneered the technology of switching power supply for external power supply of the notebook, it first created a power adapter in the history of the development of a new page, which became the world's first independent notebook adapter, because the external power supply and utilization technology of switching power supply so the notebook does not need to consider to power conversion the heat generated by the aggregation in the notebook power adapter itself, and easy to carry, and it improves the notebook computer commercialization and popularization.

         Since Toshiba opened the notebook power comprehensively to realize the switching power supply, computer power supply to complete the first generation notebook manufacturers comprehensive follow, thus becoming the pioneer and model for power adapter applications and other industries, in 90s the power adapter has been widely used in various kinds of electronic and electrical equipment, program-controlled switches, communication, power supply and control testing equipment power supply equipment. The power adapter usually consists of pulse width modulation (PWM) control, IC and MOSFET.

         Compared to linear power supplies, both the cost of the power adapter and the linear power supply increase with the increase of the output power, but the growth rates of both are different. The cost of a linear power source is higher than the switching power at a point of output power, which is called the cost reversal point. With the development and innovation of power electronic technology, power adapter technology makes the continuous innovation, increasing the cost of reversal point move to the low output power side, which provides a broad space for the development of the power adapter.

        At the end of the 90s, a series of European standards on power conversion efficiency and standby power consumption pushed the power adapter to an insurmountable height. High frequency power adapter to its direction of development, so that high-frequency switching power supply miniaturization, and the power adapter in a more wide range of applications, especially in the high-tech fields, and promote the miniaturization and portability of the high technology products. In addition, the development and application of power adapter is of great significance in energy conservation, resource conservation and environmental protection.

         In 2001, apple developed power adapter fashion and lightweight, which in turn will power adapter to another new peak, the power adapter is to the direction of the trend of lightweight fashion belt, thus giving the appearance of power adapter impression is no longer as before the appearance of single and not too beautiful. And in 20010 years, a number of power adapter manufacturers to develop and produce a large number of the world's first fully compatible with the world's major brands of notebook computer universal notebook charger. Bring your laptop power adapter into the real universal era.

        It can be said that the development of the power adapter and notebook has a close relationship. Several times, the notebook power adapter has promoted the development of the whole power adapter. The development direction of power adapter is high frequency, high reliability, low consumption, low noise, anti-interference and modularization. As the key technology of the power adapter is light, thin and small is high frequency, so the power adapter manufacturers are committed to the development of new high intelligent synchronous components, especially the improvement of the two rectifying device in power loss, and ferrite (Mn-Zn) materials to increase the scientific and technological innovation, to improve the high frequency and large flux density (Bs) under high magnetic properties, and the small capacitor is also a key technology.

        And the application of SMT technology makes the power adapter manufacturers have made great progress in the circuit board on both sides of the components to ensure that the switching power supply light, thin. High frequency power adapter must innovate on the traditional PWM switching technology, soft switching technology of ZVS, the ZCS has become the mainstream technology of the power adapter, and greatly improve the working efficiency of the power adapter. To improve the reliability index, the power supplier reduces the stress of the device by reducing the running current and reducing the junction temperature, so that the reliability of the product is greatly improved.