谐振式开关电源的开发研究

目前,利用LC并联或串联的谐振回路组成的谐振式开关电源发展非常迅速,该开关电源产生的震荡波为衰减或等幅的正弦波,在减少输出波纹方面表现较大优势。本文对谐振式开关电源进行探讨,以期为谐振式开关电源的开发研究提供参考。

轴快流CO_2激光器谐振式软开关电源

采用新型谐振式软开关技术,成功地研制出激励高功率轴快流CO2激光器的零电流谐振式软开关电源。该电源工作在25 kHz的开关频率下,主电路采用半桥式谐振变换方式,电源处于软开关工作方式,IGBT功率管为零电流开通和关断。该电源输出电流5～120 mA连续可调,功率管低损耗工作,无需镇流电阻,实现了6支CO2激光放电管的并联起辉和稳定工作。

谐振式开关技术在隔离型PFC中的应用

提出了off-line PFC的谐振式软开关技术,分析了电路原理及工作过程,提出相适应的控制方式及需注意的问题,解决了IGBT在PFC应用中的开关损耗大的问题。

提高新型大屏幕彩电开关稳压电源效率浅析

从提高开关稳压电源的效率着眼,对新型大屏幕彩电开关稳压电源电路进行了介绍,并结合应用实例对半桥式开关稳压电源的工作原理进行了分析。

ANALYSIS OF A NEW SOFT SWITCHING PWM INVERTER

Resonant dc link inverter is a zero voltage switching inverter.This paper proposes a new cascade resonant dc link inverter that consists of two power converter units,a rugged resonant dc link and an inverter bridge.A detailed analysis of the soft switching process in the rugged resonant dc link and the realization of pulse width modulation (PWM) control strategy in the inverter bridge are presented in the paper. The operation modes, the input and output features and the interface between the rugged resonant dc link and the inverter bridge are also discussed. The relationship between the circuit features and the parameters is deduced, which provides a theoretical base for the circuit design. The analysis results show that the rugged resonant dc link can be regulated by open-loop control and the control of the rugged resonant dc link is independent of that of the inverter bridge, which makes the inverter control easy and realizable.The circuit of the inverter is simulated with a standard circuit simulation program PSPICE. The simulation results are corresponding to the predicted ones of the circuit analysis.

一种基于DSP控制的高频大功率电源

随着电力电子技术及控制芯片.控制理论的不断发展.各种高性能.高功率密度的开关电源不断出现并得到广泛应用.本文介绍了一种谐振式除尘用开关电源.本电源采用数字信号处理器DSP作为控制核心.高速大功率开关器件IGBT作为逆变器功率器件.将该电源的工作频率提高到20kHz,并实现了对该电源的数字化控制.同时通过采用恰当的串联谐振式的主回路方率,大大减小了逆变电路的开关损耗与变压器损耗.