And then this paper designs the intrinsically safe power supply circuit, including the main  circuit,  switch control  circuit and over-voltage  over-current protection circuit  design.

Combined with intrinsically safe requirements and electrical performance indicators, we can optimize the transformer and filter capacitors to achieve reduced ripple.The control circuit uses PWM control chip UC3842 and dual operational amplifier LM358  in  order to achieve the output over-voltage and constant current control. In the protection circuit, in order to speed up the fault protection, shorten the spark discharge time and improve the output power, current change rate detection has been used, also,drive mode taking totem column has been used.

The final task is to build the simulation platform, by using MATLAB  simulation software to simulate the mathematical expression, to verify that the capacitor series resistance is conducive to suppress the capacitor’s discharge energy of the short-circuit. We can use simulink to establish the circuit simulation model and contact the experimental results to verify the theoretical method and design effectiveness.

Key words： Intrinsically safe DC power supply; switching power supply; intrinsically safe; flyback; cut-off type protection;

目录

第一章绪论 1

1.1本课题研究的背景与意义 1

1.1.1课题研究的背景 1

1.1.2课题研究的意义 1

1.2国内外相关研究现状及发展趋势 2

1.2.1本安电源设备的研究现状 2

1.2.2本安电源的发展趋势 4

1.3课题主要研究内容 4

第二章本安电源的分析 6

2.1本质安全基础理论 6

2.1.1爆炸三要素 6

2.1.2爆炸性物质分类和分级 6

2.1.3爆炸性场所分类 7

2.1.4本安电路的放电形式 8

2.1.5本质安全判定方法 9

2.2本质安全型电路的简介 9

2.3矿用本安电源的技术要求 10

2.4本安电源的基本架构 11

第三章本安直流电源的设计 12

3.1总体设计方案 12

3.2输入整流滤波设计 12

3.3截流型保护电路设计 13

3.4高频反激式变压器设计 16

3.4.1反激变换器工作原理 16

3.4.2高频反激变压器设计 17

3.5输出滤波电容设计 19

3.6原边电流检测电路设计 20

3.7输出电流采样电阻设计 21

3.8控制电路设计 22

3.8.1PWM控制芯片选择 22

3.8.2芯片外围电路设计 23

3.8.3反馈回路设计 24

第四章仿真与实验 27

4.1容性电路短路放电特性的研究