【作者】 李玺；

【导师】 刘华毅；

【作者基本信息】 大连理工大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 电镀镀槽是一种特殊的负载,它要求电镀电源提供可调节的直流低电压大电流,以满足不同镀件的工艺要求。本文在分析了电镀电源发展历程和研究现状以后,结合开关电源的基本原理,设计了单台输出容量为12V/600A,可多台并联输出的高频软开关电镀电源。传统的开关电源采用的是可控硅整流,其体积和重量大,纹波大,稳定性不高,效率低,电源效率一般约为70%;单台电源不能长期无故障工作,无冗余系统来保证稳定性。而采用高频软开关技术设计的软开关电源能够极大的提升整体电源的性能。在参阅了大量国内外文献的基础上,本文通过对几种典型功率变换电路拓扑的分析与比较,选择全桥零电压脉宽调制(FBZVS PWM)软开关电路拓扑作为主电路拓扑。采用UC3875作为主控制器,实现对输出电压和电流的调节。采用倍流整流技术,在变压器原边加入隔直电容,原边超前桥臂和滞后臂保持较宽范围的零电压开通条件;副边的倍流整流输出方式,两个二极管实现了自然换流,两个输出电感交错并联的方式,大大减小了系统电流纹波,减小了电感的尺寸,从而减小系统的体积和重量;运用均流控制芯片UC3907设计了电源模块的均流控制电路,实现了多模块并联组成大功率的电镀电源系统,提高了电源输出性能。最后给出了结论,参与研制的高频开关电镀电源达到了预期的技术指标,为提高电源性能所做的工作达到了预期要求。更多还原

【Abstract】 The paper firstly introduces the characteristic, historical and present situation of electroplate power supply. Then it briefly introduces the topology of power circuit of the high frequency switching electroplate power supply.The traditional DC power-supply has big bulk and weight, high ripple coefficient of output voltage, low stability and efficiency.It is hard-switch to transit which make efficiency fall to 70% around and single power is hard to keep working for a long time without redundancy system.It presents the design of a high-frequency soft switching electroplating power supply. The 7.2 kW (600A/12V) power is developed with phase-shift and current-doubter rectifier applied. In the primary side of the transformer, a blocking capacitor and a saturable inductor are used. The leading-leg is operating in zero voltage on over wide load range; In the secondary side of the transformer, current-doubter rectifier, two diodes turned off naturally, and two output inductors connected in an interleaving way, which makes the current ripple significantly reduced, and decreases the size of inductors. Therefore, the size and weight of the system can be decreased significantly. The current-sharing controller UC3907 is adopted to design the current-sharing circuit for power supply. It can realize parallel multi-module to compose high power supply system, while improving power output performance.Finally, the conclusion is the development of high-frequency switching power supply plating had met the technical specifications. The work we have done in order to improve the power performance achieves the desired requirements.更多还原