火辣西米秀 发表于 2024-11-3 21:29

新能源汽车-车载充电机OBC

本帖最后由 火辣西米秀 于 2024-11-11 10:49 编辑

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<section>一、实物图</section>

<section>水冷</section>

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<section>风冷</section>

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<section>自然风</section>

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<section>二、OBC框图</section>

<section>1.功能框图</section>

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<section>OBC核心功能:把交流电变成高压直流给电池充电。</section>

<section>2.系统框图</section>

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<section>CC、CP信号输入给谁检测是由系统决定的，不同的的车会有不同的设计，看具体车型线路。</section>

<section>三、OBC内部结构示意图</section>

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<section>充电机把220V交流&rarr;高压直流</section>
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<section>一般采用两级的结构</section>

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<section>PFC电路，用于校正功率因数</section>

<section>大功率电器没有PFC会影响电网</section>

<section>转换电路框图</section>
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<section>PFC+LLC</section>

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<section>前级PFC:交流电&rarr;直流;</section>

<section>后级LLC（隔离的DCDC转换器）:直流电&rarr;需求直流电。</section>

<section>前级桥式PFC电路，和后级LLC电路都是需要有一个控制器来控制的。隔离驱动控制四个开关管的开闭。</section>

<section>四、OBC常见故障</section>

<section>开关管烧坏、二极管烧坏、驱动芯片烧坏</section>

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<section>五、北汽EV200车载充电机</section>

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<section>六、直流转换器DCDC原理和维修</section>
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<section>1.DCDC系统主要功能框图</section>
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<section>2.详细的系统框图</section>

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<section>3.DCDC的内部结构示意图</section>

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<section>4.DCDC转换的核心原理</section>

<section>高压电&rarr;14V低压</section>

<section>分压或线性电源效率太低了</section>

<section>采用开关电源的方式进行转换</section>
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<section>北汽EV200的DCDC转换器</section>

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<section>❓怎么判断DCDC转换器有没有工作？</section>

<section>1.保证线束的正确连接</section>

<section>2.用万用表测量一下输出电压</section>

<section>3.上电测万用表电压，看电压是否在13.8-14V之间，若是DCDC正常，若不是检查一下是否有高压输入，保险是否烧蚀，使能脚是否有输入。</section>
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