Differentiation-Triggered TVC and Quasi- Zero-Delay Phase Shedding for Joint Transient Enhancement of a Multiphase Voltage Regulator

For multiphase voltage regulators (MPVRs) with conventional phase shedding and transient voltage clamping (TVC), transient response is limited by intrinsic clamping error, reduced converter loop feedback and phase shedding delay. To address the issues, this article proposes differentiation-triggered TVC (DTVC) and quasi-zero-delay phase shedding (QZDPS) schemes for joint transient enhancement of the MPVR. To eliminate the intrinsic clamping error, the DTVC scheme adopts a d
v
/d
t
circuit to detect output voltage differentiation in advance. Besides, converter load response is accelerated by saturated drive modulation in synchrony with the DTVC current injection. To take full advantage of multiphase current slew rate, the QZDPS is achieved with instant load estimation. Furthermore, to make DTVC compatible with QZDPS, the state transition logics for multiphase drive modulation are established with DTVC transient flags and QZDPS signal. It allows for a joint transient enhancement that pushes the load transient response of the MPVR to the physical boundary. According to experimental results, the proposed scheme improves the transient voltage deviation and response time by 38% and 75%, respectively. Along with the enhanced transient, the transient energy loss is reduced by 66%.