Mobile power supply improves conversion rate and optimizes design

As the demand for electronic products in people's daily lives increases, how to provide users with a power supply product that is safe, functional and affordable is a challenge that all power supply designers cannot avoid. It is particularly important for designers to find a correct methodology and find the most suitable one from many chip solutions.

The complexity of design is increasing, and a PCB often requires 10 or more power supplies. Therefore, methods that can help reduce the size of the solution, improve system efficiency, and reduce system costs, and can simultaneously configure and design multiple load power supply systems, are attracting the attention of power supply design engineers. NS's analysis and description of how to design multiple load system power supplies will surely provide inspiration and help us find relevant solutions.

The trend of energy conservation and emission reduction has led to a rapid increase in the industry's requirements for the standby power consumption and conversion efficiency of power adapters. In 2009, a new quasi-resonant flyback controller that meets the strict specifications of EPA2.0 was launched. Infineon's quasi-resonant flyback controller for green power adapter solutions naturally became a pioneer.

Through internal and external power adapters, electrical energy is converted into heat and consumed. Because it can save a lot of electricity, the commercial value of high-efficiency, low standby power adapters has become apparent, and thus, the efficiency and power loss of DC-DC converters have become an important characteristic parameter of many electronic systems. Fairchild's discussion on adapter power design, Vishay's new method for measuring power dissipation of thermal stress devices in high-frequency switching DC-DC converters, and Maxim's answer to the difficult problem of how to achieve remote control for the design of LED lighting replacement products.

Lithium-ion batteries are widely used in portable electronic devices for their high specific energy per weight and capacity. However, lithium-ion batteries are sensitive to overcharging and excessive temperature, which may lead to thermal runaway and battery explosion. How to design a safer battery charging system has become one of the key factors in the design of rechargeable battery-powered devices. So, TI will tell us how to design a safer battery charging system? Fujitsu also showed us the advantages of its laptop lithium battery charging control DC/DC converter technology.

The iPad can still achieve a 10-hour standby time even though there has been no substantial breakthrough in battery technology. It is not difficult to see that the coordinated design of power and system can achieve a more reasonable combination of power system and the whole system. This design optimization method is constantly tapping the potential of battery discharge, which is the direction of power design technology in the next few years. Of course, this is also the purpose of our editing and publishing this power supplement.