稳压电源设计报告

全国大学生电子设计大赛

稳压电源设计报告

学 校： 河南机电高等专科学校

组 别： 第一组 参赛学生： 指导老师：

日 期： 2013年7月

摘要：本设计是一个输出多种伏值的稳压电源，它以

LM7812、LM7912、

LM2576和AS1117为基础，通过变压器将交流220V电源变成±15V电源，再经二极管整流、电容滤波和稳压块稳压而成.元器件选择比较恰当，电路布局比较合理，实现了相应的功能，但是输出结果还有些误差，还需进一步更正修改。

关键词：稳压电源；LM7812；LM7912；LM2576；AS1117

Abstract：The design is a voltage-stabilized source which could

output a variety of amplitude .It is based on LM7812、LM7912、LM2576 and AS1117,through the transformer will be the AC 220V power supply into ±15V power supply, through diode rectifier、capacitance filter and voltage regulator tube voltage regulator and become. The component selection is appropriate, the circuit layout is reasonable and realize the corresponding function ,but the output has some error, still need further correction of the change.

Keywords:

AS1117

voltage-stabilized source LM7812 LM7912 LM2576

目录

全国大学生电子设计大赛 ..................................................................................... 1 稳压电源设计报告 ................................................................................................. 1 1．方案论证与比较 ...................................................................................................... 1

1．1 方案一 ......................................................................................................... 1 1．2 方案二 ......................................................................................................... 1 1．3 方案三 ........................................................................................................... 2 1．4 方案四 ........................................................................................................... 3 2． 方案分析比较与确定 ............................................................................................ 3 3.系统设计 ..................................................................................................................... 3

3．1 总体设计 ....................................................................................................... 3 3．2 单元电路设计 ............................................................................................... 4

3.2.1 ±12V电压输出模块 ............................................................................ 4 3.2.2 +5V电压输出模块 ............................................................................. 5

4．系统调试 .................................................................................................................. 5 5．系统功能、指标参数 .............................................................................................. 6 6．设计总结 .................................................................................................................. 6 7．参考文献 .................................................................................................................. 6 8．附录 .......................................................................................................................... 7

附录1 电路原理图 .............................................................................................. 7 附录2 PCB板电路图 ......................................................................................... 7 附录3 元器件清单 .............................................................................................. 8

1．方案论证与比较

1．1 方案一

采用开关稳压电源。

图1-1

1．2 方案二

工频变压器降压，多组交流输出，分别线性稳压。

1

图1-2

1．3 方案三

工频变压器降压，一组双交流输出，串联线性稳压。

D?1DIODET?D?C?CAPC?ELECTRO2U?MC7812Vin+12V3+12VU?+5V1C?ELECTRO2C?CAPD?DIODED?2DIODEVinGNDC?CAPC?ELECTRO21TRANS5C?CAP-12V3-12VC?ELECTRO2U?MC79122DIODE2GNDVin7805Vout3GND

+5V3C?C?U?AS11173.3VVout2C?C?0.110.1GNDVin100u/25V10u/10V

2