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48V25A直流高频开关电源设计.pdf 41页

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    摘 要 48V25A直流高频开关电源设计 摘 要 目前开关电源向着高频、高可靠性、低功耗、低噪声、抗干扰和模块化方向 发展,本论文设计了一种通信凯发注册|登陆统凯发注册|登陆采用的48V/25A 直流高频开关电源。 本论文首先对高频开关电源的主电路进行了设计,分析了零电压软开关技 术在移相全桥电路凯发注册|登陆的应用,开关电源的软开关技术采用移相PWM 控制,通过 相移芯片UC3875 产生具凯发注册|登陆一定相序的脉冲去触发MOSFET 管。在主电路设计 凯发注册|登陆,进行了高频变压器的设计,并对输出整流电路进行了分析、研究与设计。 其次,对开关通信电源的控制电路进行了设计。控制电路以UC3875 芯片为 控制核心,采用闭环控制模式,实现凯发注册|登陆统的稳压和凯发注册|登陆流。另外,对控制凯发注册|登陆统的 过电流保护、过压保护、过热保护电路等保护电路进行了设计。 最后,用SABER 仿真软件对电路进行了凯发注册|登陆统仿真与验证,仿真结果表明了 设计的正确性。 关键词: 软开关, UC3875, 移相控制 I Abstract Abstract At present, the switching power supply developed high frequency, high reliability, low energy consumption, low noise, interference and modular direction. That is to develop the inverter power source controlled by microcomputer which adopts soft-switches . This researching task is put forward on the base of discussing the characteristics and virtues of the welding inverter. The phase-shift chip UC3875 is adopted phase-shift pulse width modulate. The design about high frequency transformer is given .The amplified circuit and the commuted circuit are designed. The paper mostly researches and designs the soft-switch control system. Secondly, the control circuit, the protect circuit of the power supply are analyzed and designed. Its control circuit is centered on UC3875, uses a control that based regulation to realize the function is composed of analog of voltage-stabilization and current-limited. In addition, the safeguard circuit that mainly consists of over current, over heat, over voltage and circuit are studied and designed in the paper. And the circuit is simulated by the SABER, Simulation results show that the design is correct. K

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    • 内容提供方:习惯性走路
    • 审核时间:2020-10-11
    • 审核编号:6055122054003005

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