一文简析开关变压器
本文中普奥电子来为大家介绍开关变压器,希望对各位工程师朋友有所帮助。
开关变压器一般都是工作于开关状态;当输入电压为直流脉冲电压时,称为单极性脉冲输入,如单激式变压器开关电源;当输入电压为交流脉冲电压时,称为双极性脉冲输入,如双激式变压器开关电源;因此,开关变压器也可以称为脉冲变压器,因为其输入电压是一序列脉冲;不过要真正较量起来的时候,开关变压器与脉冲变压器在工作原理上还是有区别的,因为开关变压器还分正、反激输出。
单激式变压器开关电源等效成电路,其中我们把直流输入电压通过控制开关通、断的作用,看成是一序列直流脉冲电压,即单极性脉冲电压,直接给开关变压器供电。这里我们特别把变压器称为开关变压器,以表示所示电路与一般电源变压器电路在工作原理方面还有区别的。
在一般的电源变压器电路中,当电源变压器两端的输入电压为0时,表示输入端是短路的,因为电源内阻可以看作为0;而在开关变压器电路中,当开关变压器两端的输入电压为0时,表示输入端是开路的,因为电源内阻可以看作为无限大。
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目录- 密封变压器 带PTC保护的密封变压器 电抗器 高频变压器 共模电感器 工字型电感器 电流互感器 高精度电流互感器 低频电压器 环形变压器 平面变压器 产品客制能力
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