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由于工艺技术的关系,开关电源变换器的初级和次级不可能耦合得非常紧密,因而漏感总是存在的。通常漏感为变换器总电感的3%到5%。在变换器工作过程中,适当地处理贮存在漏感中的能量,不仅可以提高电源的效率,而且可以减轻功率开关管上的电压强度,从而提高电源的可靠性。图1所示为反激式开关电源线路。功率开关管Q的集电极和发射极之间所接的电阻R、电容C和二极管D是所谓的缓冲吸收网络。当功率开关管Q关断时,由于电容C的充电作用,使功率开关管Q上的集电极电压上升较慢,以
Due to the process technology, the primary and secondary switching power converter can not be coupled very close, so leakage inductance always exists. The leakage inductance is usually 3% to 5% of the total inductor inductance. During converter operation, properly handling the energy stored in the leakage inductance can not only improve the power supply efficiency, but also reduce the voltage intensity on the power switch tube to improve the reliability of the power supply. Figure 1 shows the flyback switching power supply line. The resistance R, the capacitance C and the diode D connected between the collector and the emitter of the power switch Q are so-called buffer absorption networks. When the power switch Q is turned off, the collector voltage on the power switch Q rises slowly due to the charging effect of the capacitor C to