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计算机供电问题

我想用24V直流电源给计算机主板供电,有没有相关模块将24V直流电隔离转换为±12V计算机主板可用的电,+12V至少30A输出,-12V要求不高,0.2A即可。
我的主板只需要使用±12V电源,不需要其他电压电源