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Windowed ADC is an attractive solution for the high efficiency digitally-controlled converters. However its limited conversion range restricts the transient speed for the dynamic voltage scaling applications. For slew rate improvement, this work designed a multi-mode PI/PID controller incorporated with the windowed ADC operation. In addition, to make output stable with no limit cycling, a current-controlled...
With introduction of recent standards on limiting harmonic pollution of electrical power distribution system, three-phase PWM converters are being considered as prime candidates for interfacing high-power electronic equipment to power supply lines. In these applications, converters can provide input currents without distortion and with unity power factor. In this paper, a unified discrete event model...
In this paper, the control model for a digitally controlled DC-DC converter is presented along with derivative filter. The digital implementation of this model gives the detailed description about the gain and phase responses of each block in the digital controller loop. Key problems such as quantization resolution of digital pulse width modulator (DPWM), steady state limit cycle oscillations and...
This paper focuses on a mixed-signal IC realization of a digitally controlled power converter which steps up/down from 2.7-5.5 V to 1-3.6 V for battery powered portable applications. In particular, in this work a Σ-Δ modulated digital pulse-width modulator is combined with a low power second-order multi-bit Σ-Δ ADC in a 0.5 μm CMOS process. It is shown that precise output voltage positioning in buck,...
This paper presents the design of an area-efficient and reconfigurable dual-mode (PWM/PFM) digital DC-DC controller based on distributed arithmetic. The proposed digital DC-DC controller is realized in current-mode topology to achieve better line regulation. It also features a memory-reuse concept for further area reduction and dual-mode (PFM/PWM) reconfigurability. This design is verified with measurements...
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...
Digital peak current (DPC) controlled switching dc-dc converters operating in discontinuous conduction mode (DCM) with four different digital pulse-width modulations are studied in this paper. The control laws by using four modulation methods are derived and compared with buck converter as an example. Their stabilities are also analyzed. Experiment studies are performed to compare the transient performance...
This paper focuses on the non-inverting buck-boost converter supplying an adjustable DC voltage to a WCDMA RF power amplifier (RFPA) in order to improve the system efficiency under different transmitted RF power levels. It is shown that precise output voltage positioning and low output voltage ripple over a wide output voltage range, including buck, boost and buck/boost transition modes, can be accomplished...
This paper describes a current sharing technique for digitally controlled two-phase buck DC-DC converters where pulse width and resistance mismatches are digitally compensated to achieve approximately equal current sharing without sensing currents. Effects of various non-idealities on the current sharing performance are discussed and corresponding mitigation techniques are presented. An extension...
Digital control solutions become more attractive than analog controllers because they allow easy design of more complex control strategies, reconfigurability, high immunity to noise and low power consumption. However, as the control target and power stage of the converter are inherently analog, digital controllers require the addition of Analog-to-Digital (A/D) converters. This data conversion generates...
This paper proposes a multi-function control system for single-phase bidirectional PWM converters for renewable energy system applications. A common inner AC current-loop between the different modes helps to facilitate a seamless transition between them, where several individually designed outer loops alternatively perform the different regulation tasks, namely AC voltage, DC voltage, and DC current...
This paper presents a novel controller for parallel-connected critical PFC converters, and a method is presented to achieve variable frequency PWM signals interleaving equally with only one single DSP, and the parallel-connected interleaving critical PFC modules are implemented with a single controller based on one-cycle controller, it need not detect or judge switch peak current and zero-cross of...
A novel dual-regulating mechanism for dc-dc buck conversion, which employs an inverter array based analog-to-digital (A/D) converter and the system feedback error signal to perform a fine regulation of the output voltage is presented. Based on this regulating mechanism, the proposed controller makes the output voltage converge efficiently. The proposed digital controller comprises a dual-regulating...
Proliferation of mobile electronic equipment has led to the study and development of several management techniques for managing the battery power source. Dynamic voltage scaling (DVS) is an accepted solution. An optimized hardware of an analog to digital converter (ADC) is presented here. A novel formulation of digital error value based on reference clock frequency and converter output voltage is...
In this paper, a digital and analog hybrid control of multiphase power-modules with low output-voltage and high output-current are presented. The topology of each power module is a current-fed push-pull converter. The front stage is a buck converter which is used to regulate the output voltage and the rear stage is a push-pull converter with the electrical isolation and voltage step-down function...
Without adopting encoder to convert "thermometer code" into binary code, analog-to-digital converter (ADC) architecture with direct binary code output is proposed for digital controllers of high-frequency switching mode power supply (SMPS). It can provide large conversion ranges with required precision and reduce ADC circuit complexity. The output can be compressed into a much shorter addressing...
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