最近的大容量电源从所谓体积小重量轻的角度来看,通过开关控制方式已可以实现,随着高耐压电力用晶体管的研制,直接接通电网工作亦就成为现实。电源用晶体管从动作功能方面可分为:动态领域工作方法(串联型(亦称降落型),并联型稳压电源)。开关工作方法(桥式,半桥式,单管式和冲击激励扼流圈式)。这里将阐述开关型电源用晶体管。目前,已经使用的频率大多是2～5KHz,而30～40KHz 正在进一步得到实用。从容积方面看其标准是开关型为30W/l 左右,降落型为10W/l 左右。要求电源用晶体管的特性进行交流200V 直接工作时,必要的集射耐压V_(CEO(sus))为(200V+电压变动15%)×1.4+尖峰电压,最低要有400V。在这样高耐 Recent large-capacity power supply from the so-called small size and light weight point of view, through the switch control method has been achieved, with high-voltage power transistors developed directly connected to the power grid has become a reality. Power transistors from the action functions can be divided into: dynamic field of work (series (also known as the landing), parallel power supply). Switching method of operation (bridge, half bridge, single tube and shock excitation choke). The transistor for switching power supply will be explained here. At present, the frequencies that have been used are mostly 2 to 5 KHz, while the 30 to 40 KHz are being further practiced. From the volume of its standard is the switch type is about 30W / l, landing type is about 10W / l. Required power supply transistor characteristics AC 200V direct operation, the necessary collector withstand voltage V_ (CEO (sus)) is (200V + 15% voltage variation) × 1.4 + peak voltage, minimum 400V. In this high resistance