We present a four-phase integrated buck converter in 45nm SOI technology. The controller uses unlatched pulse-width modulation (PWM) with nonlinear gain to provide both stable small-signal dynamics and fast response (~700ps) to large input and output transients. This fast control approach reduces the required output capacitance by 5X in comparison to a controller with latched PWM at similar ope...

We present a four-phase integrated buck converter in 45nm SOI technology. The controller uses unlatched pulse-width modulation (PWM) with nonlinear gain to provide both stable small-signal dynamics and fast response (~700ps) to large input and output transients. This fast control approach reduces the required output capacitance by 5X in comparison to a controller with latched PWM at similar ope...

In this paper, a digital repetitive control (RC) strategy is proposed to achieve zero tracking error for constant-voltage constant-frequency (CVCF) pulse width modulation (PWM) converters. The proposed control scheme is of “plug-in” structure: a plug-in digital repetitive controller plus a conventional controller (e.g., PD controller). The design of the plug-in repetitive learning controller is...

This paper presents a design methodology dedicated to multiphase Permanent Magnet Synchronous Machines (PMSM) supplied by Pulse Width Modulation Voltage Source Inverters (PWM VSI). Firstly opportunities for increasing torque density using the harmonics are considered. The specific constraints due to the PWM supply of multiphase machines are also taken into account during the design phase. All t...

<span lang="EN-US">Multilevel inverters have the benefit of producing high output voltage values with little distortion. This paper deals decreasing total harmonic distortion (THD) and providing an various step levels switching devices. In this study, a 27-level inverter three asymmetric H-Bridge was designed simulated based on level shift sinusoidal pulse-width modulation phase methods. ...

Full software AC servo controllers have been developed with special real time software in the Windows NT operating system. The full software AC servo controllers are able to control multiple AC servomotors with the CPU of a personal computer. The controller handles 1 00s commutation and current feedback, 200s velocity feedback, and 1 ms position feedback. The full software AC servo controllers ...

The need of higher power and more reliable applications have promoted the use multiphase alternating current (AC) drives. Mostly motors are used in wide speed operation range. To control motors, low region operated under pulse width modulation (PWM) mode high region, they square wave mode. In this paper, ripple characteristics inverter-fed multiple three-phase AC that dual (PWM modes) investiga...

This paper presents a new current control method for three phase pulse width modulation rectifiers using single dc current sensor. Conventional three-phase PFC control requires sensing of at least two input phase currents. The proposed current control method solves the problems of conventional methods by controlling a three phase PWM rectifier using only the dc-rail current as the feedback sign...

DC-connected parallel inverter systems are gaining popularity in industrial applications. However, such generate excess current ripple (harmonics) at the DC-link due to harmonic interactions between inverters addition harmonics from PWM switching. These cause failure of fragile components as capacitors. This paper proposes an interleaving scheme minimize induced a system. First, optimal phase-s...