一般的稳压电源属于连续控制型,调整元件工作在特性曲线的线性放大区,在工作过程中,调整元件要耗散较大的功率。如LPH型无汞压力计,其工作电压是直流20伏,工作电流为2安,则变压器输出至少要26伏,即 P耗>(26-20)×2=12(瓦) 即调整管的功率要耗散负载功率的二分之一以上。 由此可见,线性稳压电源的效率很低。近年来,由于电子工业的迅猛发展和自动化程度的日益提高。精密、高功能的电子设备不断涌现,要求电源的输出功率大、体积小。在这种情况下,设法提高稳压电源的效率便显得更加重要。如果使调整管处于开关状态,则电源的效 The general power supply is a continuous control type, adjust the components work in the linear amplification of the characteristic curve, in the course of work, adjust the components to dissipate large power. Such as LPH mercury-free pressure gauge, the working voltage is DC 20 volts, the operating current is 2 amps, the transformer output is at least 26 volts, P consumption> (26-20) × 2 = 12 (watts) Power to dissipate more than half of the load power. This shows that the linear regulator is inefficient. In recent years, due to the rapid development of the electronics industry and the increasing degree of automation. Precision, high-performance electronic devices continue to emerge, requiring power output power, small size. In this case, trying to improve the efficiency of regulated power supply is even more important. If the regulator is in the switch state, the power of the effect