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48V voltage regulator modules (VRMs) are critical for telecom power supplies, and is becoming popular for future data centers. By using a novel sigma converter topology, an outstanding performance in terms of efficiency (94%) and power density (420 W/in3) have been demonstrated in [11]. Both the efficiency and power density are much higher than state-of-art solutions. The sigma converter is a quasi-parallel...
Rank deficiency issues dictate that parameter identification for permanent magnet synchronous motor (PMSM) must be a step by step procedure. In this paper, the influence of parameter identification sequence to identification accuracy is analyzed and an off-line and on-line combined sequence is assessed to be the optimal sequence for improving the accuracy of resistance and flux identification. Overall...
These days, constant on-time current mode (COTCM) control schemes are widely used in the industry VR controllers for its light load efficiency and higher BW design with simpler compensation requirement. In COTCM control, external ramp is required to be added for jittering reduction to improve the noise performance of the controller. But unfortunately, with the increment of external ramp value, although...
Non-linear single-cycle load transient improvement structures are proposed for current-mode controlled converters. Two popular variable-frequency current-mode controls are Constant On-Time (COT) and Ramp Pulse Modulation (RPM) due to their fast transient response. However, conventional COT and RPM both need multiple steps to increase the inductor current during load step-up transient. The fastest...
For the conventional sliding mode control of a class of nonlinear uncertain systems, the ranges of sliding mode error and steady-state error are deduced. In order to reduce the steady-state error while anti-windup, an improved integral sliding surface is designed, and an improved integral fuzzy sliding mode control approach is proposed based on this sliding surface. In this approach, the integral...
Low profile integrated Point-of-Load (POL) converter is today's industry trend for portable electronic applications. Magnetics is the major challenge and bottleneck for achieving low profile high power density integrated POL. So, how to design a low profile magnetic becomes one of the key technologies for integrated POL. Inverse coupling is one of the possible methods to reduce inductor size due to...
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