1、 I 基于 TL494 的 DC-DC 开关电源设计 摘 要 随着电子技术的高速发展,电子系统的应用领域越来越广泛,电子设备的 种类也越来越多,电子设备与人们的工作、生活的关系日益密切。近年来 ,随 着功率电子器件(如 IGBT、MOSFET)、PWM 技术及开关电源理论的发展 , 新一代的电源开始逐步取代传统的电源电路。该电路具有体积小，控制方便 灵活，输出特性好、纹波小、负载调整率高等特点。 开关电源中的功率调整管工作在开关状态，具有功耗小、效率高、稳压 范围宽、温升低、体积小等突出优点，在通信设备、数控装置、仪器仪表、 视频音响、家用电器等电子电路中得到广泛应用。开关电源的高频变换电路
2、形式很多, 常用的变换电路有推挽、全桥、半桥、单端正激和单端反激等形 式。本论文采用双端驱动集成电路TL494 输的 PWM 脉冲控制器设计小 汽车中的音响供电电源，利用 MOSFET 管作为开关管，可以提高电源变压器 的工作效率，有利于抑制脉冲干扰，同时还可以减小电源变压器的体积。 关键词：IGBT，PWM，推挽电路，半桥电路，单端正激 II BASED ON THE DC-DC TL494 SWITCHING POWER SUPPLY ABSTRACT With the rapid development of electronic technology, electronic syste
3、ms, more and more extensive applications, the types of electronic equipment, more and more electronic equipment and people work and live closer and closer. In recent years, with the power electronic devices (such as IGBT, MOSFET), PWM switching power supply technology and development of the theory,
4、a new generation of power began to gradually replace the traditional power supply circuits. The circuit is small, flexible to control the output characteristics of a good, ripple, load adjustment rate and so on. Switching power supply in the power adjustment control work in the off state, with low power consumption, high efficiency, wide voltage range, low temperature rise, and other outstanding advantages of small size, the communication equipment, CNC equipment, Instrumentation, video audio
