PSPWM控制超声电源的研究

传统超声电源的功率调节有整流侧、直流侧和逆变侧三种调节方式,其中,逆变侧调功以硬开关PWM(脉宽调制)控制方式为主,功率器件工作于硬开关状态,开关损耗大,EMI较大,系统效率低.文中阐述了一种采用软开关PSPWM(移相脉宽调制)逆变侧调功的功率调节方式,对其工作原理、工作过程及逆变器的输出电压电流波形、功率进行数学分析,并利用Pspice软件进行仿真.结果表明,采用软开关PSPWM的控制策略,可以实现逆变器输出功率的调节,同时开关器件在零电压开通和关断,实现ZVS软开关,大大减小开关器件的功率损耗,提高了系统的效率,在超声电源研制应用中具有一定的可行性.

Research on the PSPWM Control in Ultrasonic Power

Traditional ultrasonic power has three kinds of power regulation methods including rectification, direct current and inverter. The inversion power regulation depends mainly on the hard PWM control method. The power apparatus works in the hard switching condition, which increases the switching loss, EMI, and reduces the egiciency. The paper presents a power regulation method of soft switching phase shifted pulsewidth modulation, gives the principle, process and the mathematical analysis of the output waveform, furthermore, gives the simulation using Pspice software. The result proves that the system can realize the output power regulation using the soft PSPWM control method, and the power apparatus works in the situation of zero voltage open and close, thus realizing ZVS soft switching. The control method reduces the switching losses greatly and improves the efficiency, and can be used on the development of ultrasonic power.