Adaptive Output Current FeedforwardControl in VR Applications

This study concentrates on the load disturbance in voltage-controlled three-phase voltage source inverter (VSI) with transformer. High power density could be obtained when the transformer placed behind the inductor-capacitor (LC) filter, but the voltage drop on transformer leakage impedance may reduce output voltage quality in high power application. Load current feedforward control is applied to reduce output impedance and suppress load disturbance. To avoid the non-ideal highfrequency noise introduced by full feedforward strategy, simplified feedforward strategy is proposed to improve dynamic performance. The feedforward strategies implemented in both stationary frame and synchronous frame are derived, and the reduction of output impedance is analysed in detail. The distinct features of the proposed feedforward strategies are error-free steady-state fundamental output, fast dynamic response and convenient implementation. Finally, simulation and experimental results are provided to verify feasibility and validity of the proposed control strategy.

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Power integrated circuit implementation of optimal adaptive voltage positioning scheme using progressive waveform shaping algorithm

Liu

Chang-Chien

2016

IET Power Electronics

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Adaptive voltage positioning (AVP) scheme is widely adopted in the high-load voltage regulation modules (VRMs) because it helps VRMs reducing almost half the number of output capacitors for the same design without using AVP. The AVP scheme is claimed to be optimal if its voltage transient behaviour is linear by tuning the current sensing parameter (R i) to match the value of the output capacitor equivalent series resistor (ESR). In this study, a progressive waveform-shaping method is proposed to automatically achieve optimal AVP for the VRMs without manually setting the optimal R i. Hence, as long as a proper ESR of the output capacitor is determined, VRM designers can use the least output capacitor numbers to obtain the optimal AVP waveform. The proposed method is especially appealing for the power integrated circuit application. The overall controller design was implemented by the Taiwan semiconductor manufacturing company (TSMC) 0.18 μm manufacturing process. In the real implementation, an AVP-based buck converter was devised to perform 5 μs linear transient in response to the 10 A/5 μs load current step at 1.2 V output voltage. Test of the circuit shows that the AVP performance is comparable to those state of the art.

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Adaptive Output Current FeedforwardControl in VR Applications

Cited by 22 publications

References 15 publications

A DC–DC buck converter with load-regulation improvement using dual-path-feedback techniques

A DC–DC buck converter with load-regulation improvement using dual-path-feedback techniques

Load disturbance suppression for voltage‐controlled three‐phase voltage source inverter with transformer

Power integrated circuit implementation of optimal adaptive voltage positioning scheme using progressive waveform shaping algorithm

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