摘要
功率因数校正技术存在开关周期内需要大量运算操作的问题,受数字控制器计算速度的影响,开关频率的提高受到限制;当负载和输入电压变化时,其调整能力不强。针对此问题提出一种应用于Boost功率因数校正电路中的占空比控制算法。该算法不仅可以使电流环和电压环两方面的计算同时进行,而且运算操作大大减少。当负载和输入电压发生阶跃变化时,算法通过引入输出纹波电压和前馈输入电压来补偿每个开关周期的占空比,保证了输入电流仍是良好的正弦波形,并保证功率因数校正系统具有较快的动态响应速度和较高的稳定性。仿真结果表明,电路工作在开关频率为100kHz的情况下,功率因数达到0.998以上,能够达到功率因数校正的目的。
Nowadays, there are some problems in the digital control power factor correction （PFC）, such as the need of lots of calculations within one switch cycle, the limit to increase the switch frequency affected by the processing speed of the digital controller, and its finiteness of regulation capability while the load and input voltage change. Therefore, a duty cycle control algorithm applied for boost PFC circuit is proposed in this paper. And by using this algorithm the current and the voltage loop can be calculated simultaneously. Furthermore, quantity of operations has been reduced sharply. In this algorithm, the output voltage ripple and the input voltage feed -forward are introduced to compensate the duty cycle during every switch cycle when the load and the input voltage goes step change in order to ensure the input current a good sinusoid. Then, the characteristics of high speed and stability to dynamic response for the PFC system are guaranteed. It is proved by the simulation results that the power factor reached 0. 998 when the circuit switching frequency was 100kHz. And the power factor correction has been achieved finally.
出处
《电机与控制学报》
EI
CSCD
北大核心
2010年第3期92-96,103,共6页
Electric Machines and Control
基金
黑龙江省教育厅科研项目(11531040)
关键词
功率因数校正
占空比控制算法
数字控制
BOOST电路
输出纹波
power factor correction
duty cycle control algorithm
digital control
Boost circuit
output voltage ripple
