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Different from conventional multiphase switched-capacitor (SC) DC-DC converters, the proposed unsymmetrical parallel switched-capacitor (UP-SC) regulator provides more controllable input variables to increase available conversion ratios for improved load regulation. Even under higher conversion ratio numbers, the UP-SC regulator uses the fast searching optimum ratio (FSOR) technique to search the...
Digital low-dropout regulators (DLDOs) draw great attention because of their low voltage operation and process scalability. Several works done to improve the stability and transient performance of DLDOs are based on using a clock-based comparator as an error amplifier. This paper aims to propose the use of sliding-mode control (SMC), as the controller of DLDO instead of the conventional clock-based...
Intel® introduced an energy efficient SoC power delivery scheme utilizing fully-integrated high-frequency voltage regulators along the roadmap of Moore's law scaling. From 22nm process to 14nm or even 10nm, circuit blocks shrink and the embedded passives are scaled sequentially in the similar manner. A major challenge in the on-die VR design is to achieve sufficient integration and minimization of...
In this paper, a new structure based on linear-assisted DC-DC buck converter principle is proposed. Using a segmented LDO regulator instead of the conventional linear one in the hybrid scheme, reduces the difference between input and output voltages and also the switching frequency of the buck converter, while the circuit provides a lower output ripple, better transient response. In addition, the...
An adaptive power supply regulator based on pulse skip modulation (PSM) with fast transient response is proposed in this paper. The controller of the adaptive regulator includes a clock generator, a delayline, two flip-flops, two comparators, a pulse width generator and a NAND gate. For output voltage segmentation is used, the maximum conduction duty ratio of the power switch is not limited by the...
In this paper, a new structure based on linear-assisted DC-DC buck converter principle is proposed. Using a new class-AB LDO regulator instead of the conventional linear one (based on a push-pull output stage) in the hybrid scheme, reduces the difference between input and output voltages and also the switching frequency of the buck converter. Thus, the proposal achieves higher power efficiency rather...
The task of control of object, prone to oscillation is still relevant. It has not been solved successfully yet. In particular, it is important to control the object having in the polynomial numerator of its transfer function negative coefficient of the term of the first order [1]. This or close task with varying degrees of success has been solved in a number of papers [1-14]. For example, it is proposed...
This paper discusses a technique to simplify dynamic tests of power supplies. The technique is based on the injection of an external signal into the feedback loop of a dc-dc regulator, which makes it operating as a dynamic load, if connected to the output of the power supply under test, or as a dynamic source, if connected to its input. The technique allows to easily observe load/line transient response...
Higher density, tighter margin and lower cost power solutions for the cutting edge datacenter require more characterization of voltage regulator (VR) beyond its power conversion performance such as voltage ratio and efficiency. Fast transient, ground noise sharing and high frequency switching noises coupling to high speed IO are some of the technical aspects that need to be predicted and designed...
We design time-optimal regulator for a control object consisting of four series connected integrators. The switching function of an optimal relay regulator is sought by the solution of linear partial derivative equation using its integral bases. It is established that switching functions providing time-optimal regulator performance form a definite countable set.
Emerging technologies provide SoCs with fine-grained DVFS capabilities both in space (number of domains) and time (transients in the order oftens of nanoseconds). Analyzing these systems requires cycle-accurate accounting of rapidly-changing dynamics and complex interactions among accelerators, interconnect, memory, and OS. We present an FPGA-based infrastructure that facilitates such analyses for...
The issues of a single-inductor multiple-output DC-DC converter were studied. Poor cross regulation, low efficiency, low current capability, and large ripple are the major disadvantages of the single-inductor multiple-output converter compared with a conventional DC-DC converter. Several studies to overcome these problems are introduced in this paper.
Numerous industrial facilities involve the installation of load transformers with their respective loads. As loads are turned on and off, these transformers are energized and de-energized, respectively, which can cause serious disturbances to sensitive loads. An inrush current, which typically occurs when a transformer is energized, can easily be observed using on-line uninterruptible power supply...
This paper presents an approach for current sharing in non-coupled interleaved bi-directional boost converters employed for supercapacitor applications. The approach employs a master voltage regulator for output voltage while each of the boost converters is run to follow the specified reference current. For similar boost converters, the specified reference currents, which need to be followed by the...
This paper deals with the problem of perfect elimination of the transients of the regulated output caused by parameter variations, in continuous-time multivariable linear systems. Parameter changes are assumed to be instantaneous and known in advance within a finite time horizon. The continuous-time case needs separate investigation from the discrete-time case, that has recently been solved both in...
A modular and scalable concept of voltage regulation for enhancing service continuity and increasing power rating in single-phase series voltage regulator is proposed. It is based on paralleling multiple series-voltage compensators, namely Multi-Parallel-Connected SeriesVoltage Compensator (MSVC), to perform output voltage regulation. The output current of each compensator is coupled to another one...
For high efficiency, the proposed constant on-time controlled switching regulator (SWR) directly supplies to Wi-Fi systems without cascading any low dropout regulators. On-time value adjusted by the proposed transient-enhanced technique greatly reduces transient voltage variations. Besides, an asynchronous auto-zero technique is used to minimize offset voltage effect to ±0.5% in steady state. Experimental...
A new, small and efficient voltage regulator realized using a resonant switched capacitor converter (RSCC) technology is introduced. Voltage regulation is implemented by means of simple digital pulse density modulation (PDM). It displays an ideal transient response with a zero-order response to all disturbance types. The newly developed RSCC acts as a gyrator with a wide range of voltage conversion...
The paper presents a new solar array regulator based on a buck converter with sequential switched sections. This regulator allows eliminating the problems of extra power losses due to solar section capacitance discharge and large bus capacitance that have S3R. Principle of operation is described, P-SPICE simulation and prototype testing results are compared.
The traditional high frequency PWM ac choppers are usually controlled with the rms control method and are incapable of coping with the voltage transient variation. A type of instantaneous voltage compensation control scheme of a PWM ac chopper is proposed in this paper to suppress the voltage transient variations. The proposed control scheme consists of an output voltage rms control loop and an instantaneous...
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