脉冲密度调节谐振逆变器的功率控制技术

The Power Control Technology of Pulse Density Regulation Resonant Inverter

脉冲密度调节谐振逆变器主要优点在于调节负载功率的同时能够保证逆变器开关器件始终工作在零电压和零电流开关状态,整个运行过程都具有较高的负载功率因数和较低的谐波畸变率。然而,脉冲密度调节谐振逆变器的输出功率响应往往是离散和非线性的,这就要求找出一种控制策略能够实现可靠地负载功率调节。文中针对脉冲密度调节谐振逆变器提出了一种基于CycloneⅡ可编程门阵列的预期算法和滞环比较的实现方案。仿真实验结果表明这种控制方法能够在较大的范围内实现精确的功率调节。

The advantage of pulse density regulation resonant inverter is to regulate load power at the same time to make sure the switching device in inverter working on the state of zero - voltage and zero-current, the process of operation has high load power factor and low harmonic distortion. However, the output of pulse density regulation resonant inverter is always discrete and nonlinear, which means it needs to find out a control strategy to realize load power regulation relia hly. This paper focuses on pulse density regulation resonant inverter, then proposes an implementation based on Cyclone II FPGA with prediction algorithm and hysteresis comparison. The simulation shows that this control method can perform a precise power regulation in a large range.