Threshold Median Adjustment to Achieve Accurate Current Balancing for Interleaved Buck Converter with Constant-frequency-hysteresis Control
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为实现定频迟滞(Constant Frequency Hysisteresis,CFH)交错并联Buck变换器的精确均流,该文提出了基于门限中值调节的均流环路(Threshold Median Adjustment based Current Balancing Loop,TMA-CBL).考虑多相耦合效应,推导了多相耦合小信号模型(Multi-phase Coupled Small Signal Model,MPC-SSM),以保证提出的TMA-CBL的电流稳态精度和环路稳定性.根据多相耦合小信号模型,从共模和差模两个方面考虑TMA-CBL的补偿器的设计,从而消除多相耦合效应对均流的影响.更进一步,采用全微分的方法,分析TMA-CBL中的采样电阻偏差对均流误差的影响,说明了所提均流策略的精确性.最后,基于180 nm的BCD工艺,搭建了定频迟滞四相交错Buck变换器,通过实验验证了提出的TMA-CBL电路的有效性.当采样电阻偏差为5％时,各相电流与平均电流的误差均被控制在0.68％以内.
A threshold median adjustment based current balancing loop(TMA-CBL)was proposed to achieve accurate current balancing for interleaved constant-frequency-hysteresis(CFH)buck converter.To ensure current steady-state ac-curacy and loop stability of the proposed TMA-CBL,a multi-phase coupled small signal model(MPC-SSM)was derived with consideration of coupling effect among multiple phases.Based on the MPC-SSM,a compensator of the TMA-CBL was designed from perspectives of common-mode and differential-mode to eliminate the coupling effect.Furthermore,the effect of sampling resistance deviation on current balancing error in the TMA-CBL was analyzed by the complete differen-tial method,which demonstrated accuracy of the proposed current balancing strategy.Finally,based on 180 nm BCD process,a four-phase interleaved CFH buck is constructed,and effectiveness of the proposed TMA circuit is verified by the experiment.The error between inductance current and average inductance current is within 0.68％when sensing resistors are deviated by 5％.
threshold median adjustmentconstant frequency hysteresisinterleaved buck convertermulti-phase coupled effectcurrent balancing error analysis
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