峰值電流控制的非理想直流變換器的建模

摘要：應(yīng)用電路平均建模的新方法建立了非理想Buck-Boost變換器的小信號模型，考慮了功率管的開通電阻、二極管的正向壓降和正向電阻、電感的等效串聯(lián)電阻、電容的等效串聯(lián)電阻。在此基礎(chǔ)上，進(jìn)一步推導(dǎo)了此電路在峰值電流控制下的等效功率級的精確模型，此模型適用于電感電流脈動較大，存在斜坡補(bǔ)償?shù)那闆r，比一階模型具有更高的精度。 敘詞：峰值電流模式 小信號建模 非理想變換器 Abstract：A equivalent circuit model of non-ideal buck-boost converter is derived, using the circuit averaging method. All parasitic components, such as the transistor on-resistance, the diode forward voltage drop and the ESR of the inductor and the capacitor are considered. Based on this, we derived a precise model of this circuit under the peak current controlling mode. This model is suitable for the situation when the ripple of inductance current is big and considering the slope compensation, and has a higher precision comparing to one order model.The model can be used to design the voltage loop. Keyword：peak current mode small singal modeling non-ideal converter