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三相380的变频器内板载,直流母线540Vdc,开关电源8路(有正负15Vdc)输出60瓦，整机要过CE认证，用什么开关控制芯片？拓扑？方案？
2个芯片对应要2个变压器输出8路，点解？
能否1个芯片1个变压器输出8路？
应用在变压器的开关电源有多些型号可选吗，列出选择下？
