移相全桥大功率高频开关电源的研究与设计

发布时间：2018-01-16 06:05

本文关键词：移相全桥大功率高频开关电源的研究与设计　出处：《湖北工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前大功率激光器前端储能电容的充电电源主要采用三相不控整流方式，由于整流电路不能升压，因此，为了满足激光器的功率要求，一般采用工频变压器升压，导致电源的效率低、体积大。为了提高电源的效率，减小整机体积，结合企业合作项目要求，研究并实现了用于激光器前端储能电容充电的ZVS移相全桥开关电源，其额定功率10kW、开关频率30kHz、输出直流电压0V~800V。本文主要研究内容如下： 1.根据本课题研究制作的开关电源的功率要求，主电路选择适用于中大功率电能变换的DC/DC全桥变换器，分析移相控制ZVS-PWM DC/DC全桥变换器的组成结构及其工作原理。 2.根据移相全桥开关电源系统的工作原理及控制对象，建立了移相全桥开关电源系统数学模型，设计了电感电流内环电压外环的双环控制器，结合伯德图分析了控制器的动态与稳态性能，搭建了基于Simulink的系统模型，并进行了仿真。 3.根据本课题研究制作的开关电源的性能指标要求，完成了主电路的器件选择与参数设计，主要包括：三相整流桥、滤波电容、功率开关管、隔直电容、谐振电感、隔直电容、高频变压器和输出整流桥等。根据移相全桥开关电源系统的工作原理与控制器的设计，完成了PWM移相控制电路、电流内环电压外环的双闭环控制电路、IGBT驱动电路、变压器原边峰值电流检测与控制电路以及预充电电路等。 4.根据理论分析与电路设计，搭建了开关电源系统实验平台，，在此实验平台上进行了滞后桥臂实现ZVS、占空比丢失、变压器磁通不平衡、开关管电压尖峰和输出整流二极管电压尖峰与寄生振荡等实验研究，并对实验研究结果进行了比较与分析。实验结果表明：实现了在不同输入电压、不同负载范围和不同占空比情况下的零电压开关，降低了开关损耗，提高了开关电源效率；通过合理的选择谐振电感的电感量，促进了开关电源滞后桥臂的ZVS实现，同时抑制了占空比丢失；在变压器原边串联隔直电容，有效的防止了磁通不平衡。 5.在开关电源系统实验平台的基础上，结合理论分析与实验研究，完成了移相全桥开关电源样机的制作，现场测试表明其性能满足技术指标要求。
[Abstract]:The charging power supply for high power laser front end storage capacitor mainly adopts three-phase uncontrolled rectifier, the rectifier circuit can boost, therefore, in order to meet the requirements of the laser power, the general transformer, the power supply leads to low efficiency, large volume. In order to improve the efficiency of power supply, decrease the volume, combined with the enterprise cooperation projects study on the requirements for laser front end storage ZVS phase-shifting capacitor charging full bridge switching power supply is realized, the rated power of 10kW, the switching frequency is 30kHz, output voltage of 0V~800V. in this paper, the main research contents are as follows:
1., according to the power requirements of the switching power supply produced by our research, the main circuit selects the DC/DC full bridge converter suitable for the medium and high-power power conversion. The structure and working principle of the phase shifted ZVS-PWM DC/DC full bridge converter are analyzed.
The working principle and control object according to the 2. phase shifted full bridge switching power supply system, a phase shifted full bridge switching power supply system mathematical model, double loop controller design the inductor current loop, combining the Bode diagram analysis of the dynamic and steady-state performance of the controller, set up system model based on Simulink, and simulated.
3. according to the performance requirements of the switching power supply research and production of the project, completed the device selection and parameter design, the main circuit including: three-phase rectifier, filter capacitor, power switch, capacitor, resonant inductor, capacitor, high frequency transformer and output rectifier bridge. According to the design principle and controller the phase shifted full bridge switching power supply system, completed the PWM phase shift control circuit, double closed-loop control circuit of current loop, IGBT drive circuit, the transformer primary side peak current detection and control circuit and the pre charge circuit.
4. according to the theoretical analysis and circuit design, build the experimental platform of switch power supply system, the experimental platform for the lagging arm ZVS, duty cycle loss, transformer flux imbalance, experimental study of peak voltage and rectifier diode voltage spikes and parasitic oscillation switch tube, and the experimental results are compared with the analysis of experimental results. The results show that realized in different input voltage, duty ratio of zero voltage switch under the condition of different load and different range, reduce the switching losses, improve the efficiency of the switching power supply; the inductance of the resonant inductor selection reasonable, promote the switching power supply lagging arm of the implementation of ZVS, and suppress for the duty loss; in the transformer primary side series capacitor, effectively prevent the flux imbalance.
5., based on the experimental platform of switching power supply system, combined with theoretical analysis and experimental research, the prototype of the phase shifted full bridge switching power supply is completed. Field tests indicate that its performance meets the technical requirements.

【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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