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1、1/25 中文摘要开关电源广泛应用，其效率可达80%以上，具有稳压范围宽、频率高、体积小等特点。特别是在高新技术领域的应用，推动了高新技术产品的小型化、轻便化。开关电源的发展与应用在节约能源及环保方面有重要意义。本论文主要介绍RCC型开关电源及其设计应用，RCC电路与其他 如半桥逆变）开关电源电路相比的优越性。它的体积小、不需专用PWM 控制芯片、电路简单等优点使其应用更加广泛，特别是在各种新兴电子设备的电源、充电器方面的应用尤为突出，因此在各种开关电源中占有重要地位。RCC电路包括输入整流滤波，吸收电路,开关管保护电路,RC 反馈振荡,输出整流滤波,输出过压、过流保护电路，另外最主要的是高频
2、变压器部分。最后通过仿真、调试达到 100240V市电交流输入、5V电压 0.5A 电流输出的要求，并且纹波较小效率较高。关键词：开关电源 RCC 自激 反激变换器2/25 外文摘要Title Design of single output AC/DC Switching Power Supply Abstract SwitchingPower Supplyis widely uesd,and its efficiency ismore than 80%.Meantime a wide range,high frequency and miniaturization is presented.
3、It is particularly applied in the field of high and new technology and then brings miniaturization and convenice.The development and use of Switching Power Supply are of importance in the energy saving and environmental protection.This paper mainly introduce RCC cicuit and its specific designment。RC
4、C cicuit,who is small shape,simple structure and not using particular chips,has many more advantages than other circuits as same with it,such as half-bridge ciucuit.Therefore,RCC circuit is much more widely used,especially in the source and charger of all kinds of new electronical devices.So it is s
5、uch a significance for Switching Power Supply.In the RCCcircuit,the circuit for rectification and filtering,absorption,protection,RCC fee-dback,output overvoltage and overcurrentare included.In addition,the transformer is the most importantcomponent.Finaly,this design get though tests with 100-240V
6、AC input,5V voltage and 1A current.Moerover,ripple wave is quite small.Key words：Switching power supply Flyback converter Self-excitatiion RCC 文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6
7、ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z
8、2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文
9、档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL
10、10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9
11、T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 H
12、H2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A1
13、0S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F23/25 目录1 引言 1 1.1 课题背景和意义 1 1.2 开关电源分类、特点及原理1 2 RCC 电路 4 2.1 RCC 拓扑分析 4 2.2 RCC 电路整体设计 5 2.3 电路元件参数计算及选择6 3 Saber 软件仿真 13 4 电路调试与数据分析15 4.1 电路调试 15 4.2 数据分析 18 结论 19 改进建议 19 参考文献 20 致谢 21 文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7
14、J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6
15、 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1
16、A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D
17、6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z
18、5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F
19、2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:
20、CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F21/25 1 引言1.1 课题背景和意义随着电子技术的迅速发展，各种电子设备和人们生活、工作的关系日益紧密，而电子设备却离不开可靠的电源。特别是开关电源产品广泛应用于 LED 照明、通讯设备、工业自动化控制、科研设备、仪器仪表、医疗设备等领域。传统的线性稳压电源虽然电路结构
21、简单、工作可靠，但它存在效率低 仅有 40%50%）、体积大、耗能量大等缺陷。而开关稳压电源效率可达 80%以上，稳压范围宽，还有稳压精度高等特点，是一种较理想的稳压电源。其中RCC变换器 Ringing choke converter）是一种自激型的单端反激变换器，它主要工作在临界状态,采用自激振荡工作方式来实现峰值电流控制；且具有体积小、抗干扰能力强、可靠性高,易于实现多路独立输出电压等优点，通过良好设计便可得到高效、可靠的电路。基于以上优点，RCC电路广泛用于成本低于功率50W以下的开关电源，特别随着电子技术迅速崛起，其更多应用于各类电子产品及设备的便携电源及充电器。本文旨在分析 RCC
22、 变换器的工作原理、开关管的驱动及电路中元件关键参数的计算与选择，后经Saber 软件仿真和实际硬件调试得到实验分析结果。由于要维持边界连续模式，并且原边电流上升斜率受输入电压影响，因此开关工作频率及占空比均受输入电压和输出电流的影响，其输入电压最大和空载时频率会升高。同时因其工作频率变化大，电路设计具有一定难度。1.2 开关电源分类、特点及原理1.2.1开关电源分类自激式：无须外加信号源能自行振荡，而且它完全可以看作是一个变压器反馈式振荡电路。文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX
23、5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E
24、7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编
25、码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10
26、Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4
27、A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2
28、N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S
29、9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F22/25 它激式：完全依赖于外部维持振荡。根据激励信号结构分类，可分为脉冲调宽和脉冲调幅两种：脉冲调宽是控制信号的宽度，脉冲调幅则是控制信号的幅度，两者的作用都是为了达到稳定电压的效果而使振荡频率维持在某一范围内。微型低功率开关电源：开关电源正在走向大众化，小型化。低功率微型开关电源的应用要首先体现在数显表、LED照
30、明、手机充电器、智能电表等方面。1.2.2RCC 型开关电源特点本论文只介绍RCC 型开关电源的突出特点。与常规使用专门PWM 集成芯片控制的单端反激变换器相比，RCC 变换器结构简单的多,其中只有自激振荡部分与普通并联式开关电源相同，电路中既无取样分压器也无误差放大器，并且只需用很少的几个分立元件,只在开关管基极接稳压管稳压，就可以完成同样的输出功能。另外，许多与开关管驱动相关的问题驱动波形、隔离保护、变压器饱和等）在自激振荡电路中都可以得到很好的解决。它的稳压控制过程不是 PWM 或 PFM 方式，而是由稳压管构成的电平开关来控制开关管的通断。普通 PWM 稳压过程，无论是自激式还是它激式
31、电路，开关管通断总是按其工作频率周期性的进行，PWM 系统只是控制每个周期脉冲的正程宽度即脉宽调制）。为了使稳压过程有平滑的特性，PWM 工作在线性区，脉宽调制管既不饱和也不能截止，因此不会因其截止而使某一周期脉冲宽度达到间歇振荡器时间常数电路设定的最大脉宽一般仅为其 50%），也不会因其饱和而使某一周期脉冲宽度为零。PWM 开关电源因此被称为周期性开关电源。而RCC 型开关电源则不同，其控制为无过度过程、非连续的的控制。严格的说，只有两种极端状态：输出电压低于额定值时，开关管开始振荡而导通；输出电压高于额定值时，开关管停止振荡。因此，稳压过程只有“0”和“1”两种状态。开关管文档编码:CL1
32、0Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T
33、4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH
34、2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10
35、S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 Z
36、X5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2
37、E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档
38、编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F23/25“0”和“1”两种状态的时间比 即占空比），除与市电输入电压有关外，还取决于负载电流大小。如图1 的 RCC 拓扑，负载电流减小时，滤波电容放电时间延长，直到输出电压低于额定值
39、，开关管才可以导通；负载电流增大时，次级整流电路的滤波电容放电速度加快，此时高频变压器储能可很快释放，输出电压降低，开关管由“0”进入“1”，以维持输出电压稳定。因此，开关管的截止时间取决于输入市电电压和负载电流的变化，此控制方式是非周期的，故RCC 开关电源属于非周期性开关电源。由于电路简单、体积小，特别适用于小功率开关电源供电。由RCC 型开关电源组成彩电待机副电源、PC主机 ATX待命电源以及小功率家用电器，解决了由于工频变压器式副电源稳压范围小引起的问题，避免了市电输入下限时不能开机的现象。其对负载的适应性也优于PWM 开关电源，PWM 方式的脉宽变化具有一定范围，否则会停振或失控；而
40、RCC 本身工作于极限状态，当其空载时，关断时间可以无限延长，直到输出电压开始降低。RCC 型电源属非周期性自激式开关电源，必然具有自激式开关电源的缺点，如反馈量随市电电压上升而增大，以致开关管截止损耗增大；还有它只适用于50W以下的电源，大功率时效率很低，能量损失很大。1.2.3开关电源的基本工作原理开关电源的工作过程很简单。在线性电源中，让功率晶体管工作在线性模式；与线性电源较为不同的是，PWM 开关电源是让功率晶体管工作在导通和关断的状态。与线性电源相比，PWM 开关电源是通过“斩波”这个更为效的工作过程，即把输入的直流电压斩成幅值等于输入电压幅值的脉冲电压来实现的。当输入电压被斩成交流
41、矩形波时，其幅值就可以通过高频变压器来降低或升高。通过增加或降低）变压器的二次绕组数就可以增加或降低）文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E
42、7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编
43、码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10
44、Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4
45、A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2
46、N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S
47、9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F24/25 输出的电压值。最后变压器输出的交流波形经过整流滤波后就得
48、到直流输出电压。2 RCC 电路2.1RCC拓扑分析RCC拓扑如图 1，工作原理如下：输入直流电压IN 经启动电阻 R1为三极管 Q1提供启动电流 Ib，启动瞬间由于正反馈,Q1 饱和导通的时间极短,而此时C2 还来不及充电；当Q1导通后,集电极电流上升,在变压器初级绕组N1 上产生上正下负的电压,经变压器耦合至辅助绕组上产生上正下负的感应电压,此电压经 C1,R3 后加到Q1 的基极,使 Q1 的基极电位上升,集电极电流进一步增大,N1 两端的电压升高,辅助绕组两端的电压也升高,Q1 基极电压再进一步升高,由于正反馈的作用Q1饱和导通；电容C3通过 D2半波整流充电向负载供电；电源接通一定时
49、间后,由于电容C2 上渐渐充上电压,启动电路对Q1 不再起作用。OUTINR1N1N2N3C3C2Q1R2R3C1D1D2R4图1RCC拓扑文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH
50、2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10S9D6 ZX5Z5Z2E7F2文档编码:CL10Q7J9T4A6 HH2N1A10