交错并联Boost PFC电路的应用研究

Study on Application of Interleaved Boost Power Factor Corrector

详细论述了电感电流断续模式下的Boost PFC交错并联电路,该控制电路能有效减小输入电流纹波和开关器件的电流应力、减小单个电感容量和前级EMI滤波器尺寸,提高PFC电路的功率等级和效率。分析对比了电感电流断续模式下,交错并联Boost PFC电路中分立电感和耦合电感的工作原理。由分析可知,采用电感直接耦合的PFC电路存在电感峰值电流增大,输入电流谐波含量高,功率因数低等问题。采用一种新颖的耦合电感绕线方式,并利用Gyrator-Capacitor法对该耦合方式建立模型,仿真和实验证明这种新颖的电感绕线方式能很好地克服电感直接耦合存在的缺点。

The Boost PFC interleaves circuit of inductance current continues double Boost DC/DC converter is discussed.Interleave Boost circuit is capable of reducing the output wave ripple,switching stress,inductance capability and EMI filter size.It improves power grade and efficiency,meanwhile,the separated inductors and coupled inductors used in the inter-leaved Boost PFC are analyzed respectively.Compared with separated inductors,the peak current in coupled inductors is large,the harmonic components of the input current are high,and the power factor is low.So a novel integrated inductor is applied,which is developed by using the Gyrator-Capacitor approach.The simulation and the experimental results show the drawbacks of coupled inductors are overcome by the integrated inductors.