DC switching li ion 18650 battery pack protection circuit li ion 18650 battery pack solution

　　With the development of science and technology, power electronic equipment is increasingly closely related to people's work and life, and electronic equipment is inseparable from reliable li ion 18650 battery pack. Therefore, DC switching li ion 18650 battery pack begins to play an increasingly important role and has entered various fields one after another. In the fields of electronic and electrical equipment, program-controlled switches, communications, electronic testing equipment power supplies, control equipment power supplies, etc. have widely used DC switching power supplies. At the same time, with the development of many high-tech technologies, including high-frequency switching technology, soft switching technology, power factor correction technology, synchronous rectification technology, intelligent technology, surface mounting technology and other technologies, switching li ion 18650 battery pack technology is constantly innovating, which provides DC switching li ion 18650 battery pack provides a wide range of development space. However, due to the complexity of the control circuit in the switching li ion 18650 battery pack, the transistors and integrated devices have poor ability to withstand electrical and thermal shocks, which brings great inconvenience to users during use. In order to protect the safety of the switching li ion 18650 battery pack itself and the load, based on the principles and characteristics of the DC switching li ion 18650 battery pack, overheating protection, overcurrent protection, overvoltage protection and soft start protection circuits are designed.

　　Principles and characteristics of switching li ion 18650 battery pack

　　working principle

　　DC switching li ion 18650 battery pack consists of input part, power conversion part, output part and control part. The power conversion part is the core of the switching li ion 18650 battery pack. It performs high-frequency chopping of unsteady DC and completes the conversion functions required for output. It is mainly composed of switching transistors and high-frequency transformers. Figure 1 shows the schematic diagram and equivalent principle block diagram of a DC switching li ion 18650 battery pack. It is composed of a full-wave rectifier, a switching tube V, an excitation signal, a freewheeling diode Vp, an energy storage inductor and a filter capacitor C. In fact, the core part of the DC switching li ion 18650 battery pack is a DC transformer.

　　Features

　　In order to meet the needs of users, major switching li ion 18650 battery pack manufacturers at home and abroad are committed to the simultaneous development of new highly intelligent components, especially by improving the losses of secondary rectifier devices and improving power ferrite (Mn-Zn) materials. Increase technological innovation to improve high magnetic performance at high frequency and larger magnetic flux density. At the same time, the application of SMT technology has made great progress in switching power supplies. Components are arranged on both sides of the circuit board to ensure the reliability of switching power supplies. Light, small and thin. Therefore, the development trend of DC switching li ion 18650 battery pack is high frequency, high reliability, low consumption, low noise, anti-interference and modularization.

　　The disadvantage of DC switching li ion 18650 battery pack is that it has serious switching interference and its ability to adapt to harsh environments and sudden failures is weak. Since domestic microelectronics technology, resistive device production technology and magnetic material technology are still far behind those of some technologically advanced countries, the production of DC switching power supplies is technically difficult, troublesome to maintain and costly.

　　Protection of DC switching li ion 18650 battery pack

　　Based on the characteristics of the DC switching li ion 18650 battery pack and the actual electrical conditions, in order to make the DC switching li ion 18650 battery pack work safely and reliably in harsh environments and sudden failures, this article designs a variety of protection circuits according to different situations.

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