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【原创】电动汽车车载充电机电路的设计原理

  • 2026-02-09 17:00:44
【原创】电动汽车车载充电机电路的设计原理
1
专家门诊
熊老师您好！我检修过几台电动汽车的车载充电机，不明白车载充电机电路板，为什么要设计成将进入的交流电整流后，又逆变成交流电升压，二次整流输出。如果交流电一进入就升压，再整流输出，不是可以省去一个整流电路，还可省去了一个逆变电路，更加简单可靠吗？
山东读者：田亮
电动汽车车载充电机电路板如图1所示，如果按照你所说的去做，确实简单，但不可靠。因为电路中难以采用先升压再整流后输出的简化电路，主要有以下几方面原因。

图1 车载充电机内部电路板

一是电网兼容性问题。车载充电机通常要接入不同标准的电网电源，像常见的家用220V交流电等，电压高时可达310V，低时只有100V，如果先升压，对于这样的市电输入，在没有合适的前期整流、逆变等处理环节配合时，简单的充电电路无法很好地适应不同地区、不同规格电网电压的波动，容易出现不兼容甚至损坏设备的问题。
二是控制精度与灵活性不足。先通过EMI电路去干扰再整流，然后逆变、升压、二次整流，这个流程能在各个环节利用电子器件实现精准的控制，比如通过PFC电路进行功率因素校准，让电压和电流的相位频率一致。要是简化为先升压再整流，后续对于电能的控制就会变得很粗糙，难以满足电动汽车动力电池在不同充电阶段(如恒流充电、恒压充电阶段)对充电电流、电压高精度、灵活调节的要求，不利于高压电池的良好充电和寿命保障。
三是安全保障难度增大。完整的先整流、逆变、升压再整流流程中，每个环节都有相应配套的保护电路和安全机制，能够依次对过压、欠压、过流等异常情况进行监测和处理。而简化电路后，集中在后续进行处理时，一旦出现异常情况，很难及时且有效地进行应对，容易使电池或整个充电机电路面临较大安全风险，无法确保充电过程的安全可靠。
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  1. CONNECT:[ UseTime:0.000433s ] mysql:host=127.0.0.1;port=3306;dbname=e_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000886s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000284s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000270s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000671s ]
  6. SELECT * FROM `set` [ RunTime:0.000256s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000733s ]
  8. SELECT * FROM `article` WHERE `id` = 466840 LIMIT 1 [ RunTime:0.002208s ]
  9. UPDATE `article` SET `lasttime` = 1770693089 WHERE `id` = 466840 [ RunTime:0.000668s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000261s ]
  11. SELECT * FROM `article` WHERE `id` < 466840 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002418s ]
  12. SELECT * FROM `article` WHERE `id` > 466840 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008363s ]
  13. SELECT * FROM `article` WHERE `id` < 466840 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006052s ]
  14. SELECT * FROM `article` WHERE `id` < 466840 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005825s ]
  15. SELECT * FROM `article` WHERE `id` < 466840 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009108s ]
0.108768s