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电源学习笔记:CCM/DCM/BCM 模式

  • 2026-03-22 03:01:53
电源学习笔记:CCM/DCM/BCM 模式
电源学习笔记：CCM/DCM/BCM 工作模式， 2026/3/20
今天围绕开关电源的CCM、DCM、BCM 三种工作模式及相关特性进行了学习，核心内容和关键结论梳理如下：
一、三种工作模式的核心定义与关联
  • CCM（连续导通模式）：
    • 电感电流在开关周期内始终不为零，波形为连续锯齿波，波动小。
    • 输出电压公式仅与占空比、输入电压相关（如 Buck 电路 Vout=D⋅Vin），与负载无关，稳定性高。
  • DCM（非连续导通模式）：
    • 电感电流在周期内会降至零，存在 “电流中断的空闲期”，波形为断续锯齿波，峰值高。
    • 输出电压公式受负载影响（引入负载电阻参数），稳定性较低。
  • BCM（临界导通模式）：
    • 介于 CCM 与 DCM 之间，周期末电感电流恰好降为零（无空闲期），属于 CCM 的 “临界特例”。
    • 输出电压公式与 CCM 一致，仅电流波形为 “临界连续”。
二、效率差异的核心原因（中重载 vs 轻载）
  • CCM 在中重载效率高：中重载时，导通损耗（I²R）占主导。CCM 电流连续且波动小，有效值接近平均电流，导通损耗低；若用 DCM，需以 “高峰值电流” 传递同等能量，有效值激增，导通损耗显著升高。
  • DCM 在轻载效率高：轻载时，开关损耗占主导。DCM 电流断续，减少开关损耗；CCM 则因持续开关，开关损耗占比更高。
三、EMI 与振荡特性差异
  • DCM 的 EMI 频谱更丰富、易振荡：
    • 电流突变：DCM 电流从 0 到峰值的 di/dt 远大于 CCM，激励高频辐射。
    • LC 谐振：电流归零后，输出电感与 MOS 管漏源寄生电容（Cds）、二极管结电容形成 LC 振荡，产生高频噪声（Cds 是主要寄生电容）。
    • 优势：续流二极管电流归零后自然关断，无反向恢复干扰，这一点优于 CCM。
  • CCM 的 EMI 更平缓：
    • 电流连续且波动小，di/dt 低，辐射弱。
    • 劣势：续流二极管需从导通瞬间关断，存在反向恢复时间，产生额外噪声。
四、总结
  • 模式本质是电源根据负载自动切换的状态，核心是平衡效率与稳定性。
  • BCM 因电压公式与 CCM 一致、电流临界连续，属于 CCM 的边界状态。
  • DCM 的振荡由 “电感 + 寄生电容” 的 LC 回路主导，输入侧大电容因高频短路特性不参与谐振，但 ESR 会消耗振荡能量。
  • 高频噪声的核心来源是电流变化率（di/dt），DCM 因导通 / 关断时的高 di/dt，噪声显著高于 CCM。
五、相关的英文词汇
  • CCM : Continous Conduction Mode, 连续导通模式
  • DCM : Discontinous Conduction Mode, 非连续导通模式
  • BCM : Boundary Conduction Mode, 临界导通模式
  • ESR :  Equivalent Series Resistance， 等效串联电阻
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  1. CONNECT:[ UseTime:0.000440s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000817s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000300s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000294s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000711s ]
  6. SELECT * FROM `set` [ RunTime:0.000254s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000798s ]
  8. SELECT * FROM `article` WHERE `id` = 476064 LIMIT 1 [ RunTime:0.013430s ]
  9. UPDATE `article` SET `lasttime` = 1774292318 WHERE `id` = 476064 [ RunTime:0.002503s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000325s ]
  11. SELECT * FROM `article` WHERE `id` < 476064 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000659s ]
  12. SELECT * FROM `article` WHERE `id` > 476064 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.012226s ]
  13. SELECT * FROM `article` WHERE `id` < 476064 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001147s ]
  14. SELECT * FROM `article` WHERE `id` < 476064 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000957s ]
  15. SELECT * FROM `article` WHERE `id` < 476064 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001421s ]
0.105582s