摘要
针对以往高压辅助电源驱动不同步导致开关器件电压应力不同、热损耗不均、整机效率低下等问题,文中采用双管反激拓扑,研究输入300~1 000 V、额定带载35 W的辅助电源,实现多路多电压等级输出。首先介绍基于峰值电流电压双闭环的功率电路、控制电路,建立主电路小信号模型;然后对系统主要损耗进行理论分析,并在满载条件下进行效率计算。相比于传统双管反激辅助电源采用脉冲变压器作驱动电路,文中提出利用专用驱动芯片输出PWM控制信号,上MOS管驱动芯片采用自举电路和自供电绕组隔离供电,以满足驱动同步、高压隔离要求。样机测试数据表明:在300~1 000 V输入、输出额定带载条件下,各路电压输出稳定、纹波小,效率高达88.5%,说明所设计方案是合理的,在高压换流器中具有实用价值。
In allusion to the problems of different voltage stress of switching devices,uneven heat loss and low efficiency of the whole machine caused by the non-synchronization of the high-voltage auxiliary power supply in the past,a dual-tube flyback topology is designed to achieve 300~1 000 V input,rated load 35 W,and more Auxiliary power supply with multi-voltage output. The power circuit and control circuit based on the peak current and voltage double closed loop are introduced,the small signal model of the main circuit is established,the main loss of the system is analyzed theoretically,and the efficiency calculation is carried out under the condition of full load. Compared with the traditional dual-tube flyback auxiliary power supply that uses pulse transformers as the drive circuit,it is proposed to use a dedicated drive chip to output PWM control signals. The upper MOS tube drive chip uses a bootstrap circuit and self-powered winding isolation power supply to meet the requirments of drive synchronization and high voltage isolation. The test data of the prototype shows that under the conditions of 300-1 000V input and output rated load,the voltage output of each circuit is stable,the ripple is small,and the efficiency is as high as88.5%,which verifies the design scheme is rational and has practical value in high-voltage converters.
作者
张明
张毅
王国儒
冯起鹏
ZHANG Ming;ZHANG Yi;WANG Guoru;FENG Qipeng(School of Electrical&Control Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China)
出处
《现代电子技术》
2022年第20期109-113,共5页
Modern Electronics Technique
关键词
双管反激
高压宽范围
辅助电源
高压输入
高效率
同步驱动
隔离
浮地驱动
two-tube flyback
high voltage wide range
auxiliary power supply
high voltage input
high efficiency
synchronous drive
isolation
floating drive
