高效紧凑的高压脉冲电容器恒流充电电源

基于高频谐振电路研制的高压脉冲电容器充电电源。采用IGBT构成电源的软开关电路和闭环变频控制充电电流的方式。对输出端负载大范围变化引起的谐振频率漂移，采用微调开关时间．保证了变换器开关零切换，显著降低了导通、关断时IGBT的损耗。通过对100μF高压电容器充电实验．证明恒流充电电源的恒流效果好、充电重复精度和效率更高。在短路状态下能安全可靠地工作。

A NEW SOFT-SWITCHING PUSH-PULL THREE-LEVEL CONVERTER

The application areas of conventional push pull converters are limited because of high voltage stress of switches (twice of input voltage). This paper presents a novel zero voltage and zero current switching (ZCS) PWM push pull three level converter in which the voltage stress of switches is input voltage. With phase shifted modulation strategy, the leading switches can only realize zero voltage switching (ZVS), and the lagging switches can realize ZCS when block capacitor and block diodes are added. Using the strategy, the converter overcomes the drawbacks presented by the conventional push pull converter, such as magnetic aberration, large switch loss, and voltage spike on switches, so it can get higher efficiency, and a wider application area. The operating principle of the new converter is analyzed and verified on a 600 W, 50 kHz experimental prototype. Several zero voltage and zero current switching PWM push pull three level converters are proposed.

谐振式激光器恒流充电电源的设计

基于串联谐振电路结构,固定导通时间、变频控制以及零电流切换的技术,为激光器高压储能电容设计了20kV/50mA的恒流充电电源。对随着充电电压增高,谐振频率漂移引起的开关非零切换问题,设计了零电流同步开关探测控制电路。充电电压和充电电流的大小由微处理器控制。前者正比于充电电流脉冲的总个数,后者则正比于开关工作频率。