摘要
为简化有源功率因数校正的控制策略,提高整机效率,提出了Boost型功率因数校正的一种新的电流型控制方法,其控制结构与线性峰值电流控制、非线性载波控制、预测开关调制的控制结构一样。和传统的峰值控制、平均电流型控制相比,该法无需乘法器、无需检测输入电压、无电流环的稳定性问题,而且通过预测平均电流控制执行不同的开关原理,扩大了连续导电模式的运行范围、没有低频振荡,带两个复位积分器的电路产生预测电流。仿真结果验证了该方法的可行性,能很好地在宽范围输入和负载变化下获得单位功率因数,抗干扰能力强。
A new variation of current mode control technique for Boost power factor correction is proposed to control the duty-ratio of a switch such that the estimated average inductor current will be proportional to the average value of the rectified input voltage in each switching period.The same control structure as that of the linear peak current mode control,the nonlinear carrier control and the predictive switching modulator have following advantages over conventional peak and average current mode PFC（Power Factor Correction） techniques such as： not needing the controller multiplier and input voltage sensing circuits,and having no conditional stability problem of the current loop.The carrier wave（predictive current trace） is generated by using the circuit with two reset integrators,but the reset switches are driven by the signal of the R-S flip-flop instead of driven by the clock signal.By this method,the reset of the integrator capacitors is in the OFF time of power switch,not in ON time, so the reset time of the integrator capacitor will not influence the carrier waveform.Using a Predictive Averaged Current Mode Control（PACC） extends the range of continuous conduction mode of operation and eliminates sub-harmonic oscillations.Simulation results show that the proposed strategy works well and unity power factor can be achieved with wide input voltage and load current variation range.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2007年第12期196-200,216,共6页
High Voltage Engineering
关键词
功率因数校正
预测平均电流控制
低频振荡
稳定性
载波波形
仿真
power factor correction
predictive averaged current mode control
sub-harmonic oscillations
stability
carrier waveform
simulation
