闪光灯电源的研究与实施

J4 ›› 2015, Vol. 14 ›› Issue (12): 47-50.

闪光灯电源的研究与实施

（1. 安徽国防科技职业学院机电工程系，安徽六安237001；2.中国地质大学自动化学院，武汉430074）

收稿日期:2015-08-21 出版日期:2015-12-15 发布日期:2015-12-15
作者简介:吴年祥，实验师，主要从事机器人智能检测与控制技术及实验实训管理研究.
基金资助:
安徽省教育厅自然科学基金重点项目（KJ2015A448）；安徽国防科技职业学院骨干教师项目（gfggjs201211）

Research and Implementation of Flashlight Power Supply

（1. Department of Mechanical and Electrical Engineering, Anhui National Defense Vocational College, Liu'an, Anhui 237001, China;
2. College of Automation, China University of Geosciences, Wuhan 430074, China）

Received:2015-08-21 Online:2015-12-15 Published:2015-12-15

摘要/Abstract

摘要：

以SC91F721单片机作为闪光灯电源的控制核心，利用电流型斩波电路将低直流输入电压升高给单片机供电，通过场
效应管输出开关控制电路稳定输出电流。采用采样电路电阻反馈输出电流，经过电流信号放大，单片机输出脉冲宽度调制信
号、恒流源控制电路有效的恒定输出电流。实验结果表明，该变换器实现连续和脉冲两种输出模式、电池电能转化为恒流输
出、驱动高亮度白光发光二极管、电流档位的选择、输出电压限压保护和过载报警功能。系统输出相对误差小于1.5%，效率达
到91.8%，能够满足恒流稳压电源的要求。

关键词: 脉冲宽度调制, 恒流源, 采样电路

Abstract:

SC91F721 microcontroller, as the control core of the flash power supply, raises the low DC input voltage by using current
mode chopper circuit to supply power to microcontroller, and stabilizes the output current of the switch control circuit by the metaloxide
semiconductor. Using the feedback output current of the sampling circuit, the output Pulse Width Modulation（PWM）signal and
the constant current source control circuit are effective. The experimental results show that the converter can realize two kinds of output
mode: continuous and pulse, battery power conversion to constant current output, high brightness white light emitting diode, current
profile selection, output voltage limiting protection and overload alarm function. The relative error is less than 1.5% and the efficiency
is 91.8%, which can meet the requirement of constant current power supply.

Key words: Pulse Width Modulation（PWM）, constant-current source, sampling circuit

中图分类号:

TN86

吴年祥. 闪光灯电源的研究与实施[J]. J4, 2015, 14(12): 47-50.

Wu Nianxiang. Research and Implementation of Flashlight Power Supply[J]. J4, 2015, 14(12): 47-50.