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The maximum closed-loop bandwidth of a dc-dc converter is restricted to a fraction of its switching frequency, while governed by a conventional pulse-width-modulation (PWM) technique. Even an advanced geometric control is limited by its internal slew rate. The bandwidth can be made close to (even higher than) the switching frequency through converter augmentation; however, it requires a proper control...
This paper presents an oversampled digital controller IC for low-power switch-mode power supplies (SMPS) that achieves fast response with a minimized addition of switching losses due to its control actions. To reduce the voltage deviation and improve converter response time, the controller samples the output voltage four times per switching cycle. A single voltage sample is processed by the conventional...
In power electronics efficiency improvement is constantly being sought out through venues such as improved topologies or improved devices. Series loaded resonant (SLR) DC-DC converter is a type of soft-switching topology widely known for providing improved efficiency. This paper investigates the efficiency and transient performance of SLR when a new type of diode called Super Barrier RectifierTM is...
This paper reports a monolithic DC-DC buck converter using the differentially enhanced duty ripple control (DE-DRC). Without any compensation circuit, this converter is stable over a wide input and output range. The switching frequency is kept constant by adjusting the on-time according to the input and output voltage. Because of the large duty ripple voltage with a big noise margin, the DE-DRC buck...
The duty cycle of the conventional multi-phase buck converter becomes extremely small as the output voltage becomes lower and lower. This is a severe challenge as the switching frequency goes up. This paper presents a power circuit architecture to improve the efficiency of the laptop computer CPU Voltage Regulator (VR) by extending the duty cycle while improving the dynamic performance as well. The...
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