保护正文解决方案.doc

3KA/60直流开关电源保护电路设计 摘 要：开关电源具有效率高、体积小、重量轻、可靠性高、负载分担容易等一系列特点。开关电源是利用现代电力电子技术，控制开关晶体管开通和关断的时间比率，维持稳定输出电压的一种电源，开关电源一般由脉冲宽度调制（PWM）控制IC和MOSFET构成。开关电源和线性电源相比，二者的成本都随着输出功率的增加而增长，但二者增长速率各异。线性电源成本在某一输出功率点上，反而高于开关电源，这一成本反转点。随着电力电子技术的发展和创新，使得开关电源技术在不断地创新，这一成本反转点日益向低输出电力端移动，这为开关电源提供了广泛的发展空间整个电源由输入电路、整流电路、反馈电路、过压保护电路、过流保护电路、自恢复电路、输出电路等，还具有软启动功能。；； 3KA / 60 DC switching power supply protection circuit design Abstract：Switching power supply with high efficiency, small size, light weight, high reliability, easy load balancing and a series of features. Switching power supply is the use of modern power electronics technology, control the switching transistor turn-on and turn-off time ratio, to maintain a stable output voltage of a power supply, switching power supply is generally a pulse width modulation (PWM) control IC and MOSFET constituted. Switching power supply and linear power compared with the increasing cost of both power output and growth, but the growth rate of both different. Cost linear power output on a power point, but higher than the switching power supply, the cost of turning points. With the power electronics technology and innovation, so that the switching power supply technology in constant innovation, the cost of reversing the growing point moves to the low output power terminal, which provides a broad space for development switching power supply. Based on UC3842 application characteristics, it describes a composition by the UC3842 switching power supply having a protection circuit. The entire power from the input circuit, a rectifier circuit, feedback circuit, overvoltage protection circuit, overcurrent protection circuit, self-recovery circuit, output circuit and the like, but also has a soft start function. Switching power supply and linear power compared with the increasing cost of both power output and growth, but the growth rate of both different. Switching power supply is higher than the normal linear power efficiency, switching power supply application d