一种低热耗功率的电容降压型直流电源

A capacitor step-down DC supply with low thermal power consumption

电容降压型直流电源以体积小、成本低的特点,广泛应用于各类小功率电子设备中。针对传统电容降压型直流电源电路,通过引入一个可控硅器件,并对电路结构进行适当调整,设计出一种新型的电容降压型直流电源。该电源在输出负载变小甚至空载时,均表现出很低的热耗功率特性,从而有效地解决了传统电容降压型直流电源因热耗功率过大而导致的发热问题。该电源结构简单,输出可调,负载变化适应性强。

The DC supply with capacitor step-down finds widely application in various low-power electronic devices due to small volume and low cost. Based on the classic capacitor step-down DC supply circuit, this paper presents a type of new DC supply by introducing an SCR device and improving circuit structure. The new power supply characterizes a very low thermal power consumption when it works with output load varies dynamically even down to no-load, solving the heating problem resulting from high thermal power consumption of the existing capacitor step-down DC power supply. The new capacitor step-down DC supply is of circuit structure simplicity, output adjustability and load adaptability.