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<div>整流滤波电路是交流电压经整流，再滤波后得到较为纯净的直流电压。功率变换是设计的关键部分，其设计过程主要包括功率元件选择和变压器设计。</div> <div>主电路：</div> <div>冲击电流限幅，限制接通电源瞬间输入侧的冲击电流。输入滤波器其作用是过滤电网存在的杂波及阻碍产生的杂波反馈回电网。逆变可以将整流后的直流电变为高频交流电，这是高频开关电源的核心部分。</div> <div>控制电路：</div> <div>一方面从输出端取样，与设定值进行比较，然后去控制逆变器，改变其脉宽或脉频，使输出稳定，另一方面，根据测试电路提供的数据，经?；さ缏芳?，提供控制电路对电源进行各种?；ご胧?。</div> <div>芯片辅助元件：</div> <div>一般电阻及接地电容决定了芯片内部的振荡频率，大多数电源设计人员认为芯片振荡只要频率对了就可以，其实不然，设计芯片振荡RC的值还跟最大占空比有关。</div> <div>启动及辅助供电电路，其功能是实现电源芯片自启动供电和正常工作供电。检测电路，提供保护电路中正在运行中各种参数和各种仪表数据?；褂锌毓芗捌淝⑶缱杓捌浔；の妊苟?、电流采样电阻及采样电流滤波电路、吸收回路设计等基本组成部分。</div> <div>整流二极管部分：</div> <div>AC-DC电源模块输出整流二极管需要满足温升和耐压值要求，解决温升一般是使用肖特基二极管或选用电流更大的二极管。另外整流二极管本身就是一热源，要注意散热，不能放在发热元件附近。二极管耐压值选择一般要大于两倍的反激电压，如果加入RC吸收电路来吸收二极管尖峰，可以选择耐压值大于1.5 倍反激电压的二极管。</div> <div>输出整流及滤波：</div> <div>反激式AC-DC电源模块输出滤波通常由二极管和滤波电容以及假负载组成，根据负载需要，提供稳定可靠的直流电源。滤波电容的电解电容ESR比较大，所以主要考虑电容ESR对输出电压纹波的影响。</div> <div>假负载部分：</div> <div>其大小是由辅助绕组的供电决定，如果假负载太轻，那么?？榈缭词涑隹赵厥备ㄖ谱榈貌坏阶愎还┬酒ぷ鞯哪芰浚缭椿岽蜞?。另外适当加大假负载会提高电源动态和交叉调节能力。在调试电源中如果出现打嗝现象，可以加大假负载再调试。</div> 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