Sensorless current-mode control of a digital dead-beat DC-DC converter

Kelly, Anthony; Rinne, K.

doi:10.1109/apec.2004.1296109

Cited by 38 publications

(17 citation statements)

References 12 publications

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“…Nevertheless, the Hall current sensor is relatively expensive, and requires additional analog sampling circuits. Thus, CO(Current Observer) [5][6][7][8][9][10][11] turns to be an ideal substitute for conventional current sensors.…”

Section: Introductionmentioning

confidence: 99%

Optimal Current Observer for Predictive Current Controlled Buck DC-DC Converter

Min

Chen

Dong

et al. 2014

2014 International Symposium on Computer, Consumer and Control

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In digital current mode controlled DC-DC converter, the conventional current sensor is either costly or has low accuracy. Thus, current observer, which could be realized based on digital circuit itself, is an ideal substitute for conventional current sensors. However, the observed current may diverge because of parasitic parameters. In this paper, an optimal current observer is proposed to solve the problem. Employing the optimal current observer based predictive current control, a buck converter, which shows preferable transient response than PID controlled converter is implemented. The effectiveness of the optimal current observer is experimentally demonstrated.

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Section: Introductionmentioning

confidence: 99%

Optimal Current Observer for Predictive Current Controlled Buck DC-DC Converter

Min

Chen

Dong

et al. 2014

2014 International Symposium on Computer, Consumer and Control

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“…The designs reported in [28] and [29] give continuous, smooth and fast current sensing. However, the dc accuracy highly depends on the value of the dc resistance of the inductor.…”

Section: A Full-waveform Current Sensormentioning

confidence: 98%

A Single-Inductor Multiple-Output Auto-Buck-Boost DC–DC Converter With Autophase Allocation

Zheng

Guo

et al. 2016

IEEE Trans. Power Electron.

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A single-inductor multiple-output (SIMO) converter with auto-buck-boost feature is presented in this paper. A seamless auto-buck-boost scheme for SIMO dc-dc converter using time-multiplexing control is proposed. Additionally, with the proposed first-order phase lock loop (FOPLL) and autophase allocation, this circuit solves the problem of unbalanced loadings of different channels, and it also keeps the locking time of the inductor current sufficiently short to minimize average inductor current for attaining higher efficiency. By combining with all channel controllers, FOPLL not only allows fast loadtransient response without degrading the power efficiency, but it also reduces controller order of the frequency control loop, attenuates the noise injected from charge pump and achieves robust stability. The scheme enables the dc-dc converter to operate from wide input and output ranges. Implemented in a 0.35-µm CMOS technology, the chip area is 5000 µm × 1850 µm, including ESD test pads. The switching frequency is fixed at 0.25 MHz. The load-transient response time is less than 100 s. The proposed converter achieves a peak efficiency of 89% and maximum output power up to 1.46 W with efficiency of 70%.Index Terms-Auto-buck-boost, SIMO dc-dc converters, timemultiplexing control.

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“…(6) and (7) is asymptotically stable, and a convergent sliding-mode motion occurs on the sliding surface defined in Eq. (8) under some conditions.…”

Section: Observation Error Dynamicsmentioning

confidence: 99%

“…Some sensorless controls have been introduced in previous papers as follows. The use of the integral of the voltage drop on the inductor to estimate the inductor current was introduced in [4], [5], the use of the predicted inductor current for peak current control was introduced in [6], [7], and the use of a state observer based on the state-space equation was introduced in [8], [9]. Investigation results show that, a Luenberger observer (LO) [9] and Kalman filter (KF) [10] are most effective in observing the inductor current of switching converters.…”

Section: Introductionmentioning

confidence: 99%

Design of Sliding-Mode-Observer-Based Sensorless Control of Boost Converters for High Dynamic Performance

Chen

Yoshihara

2015

Journal of Signal Processing

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An inductor or switch current is necessary to control a boost converter in the continuous conduction mode for high dynamic performance. Sensorless current control of a boost converter reduces its cost, size, and weight. A Luenberger observer (LO) only feeds a linear output estimation error back to the observer. In this paper, a sliding mode observer (SMO), which feeds a nonlinear output estimation error back to the observer, was proposed for the sensorless control of a boost converter to improve its dynamic performance. Simulations by Simulink and practical experiments on an NJU20010 digital signal processor are performed. It is shown that the proposed SMObased sensorless control of a boost converter maintains better dynamic performance than LO-based sensorless control and conventional sensor-based double-loop Proportional-Integral (PI) control.

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Sensorless current-mode control of a digital dead-beat DC-DC converter

Cited by 38 publications

References 12 publications

Optimal Current Observer for Predictive Current Controlled Buck DC-DC Converter

Optimal Current Observer for Predictive Current Controlled Buck DC-DC Converter

A Single-Inductor Multiple-Output Auto-Buck-Boost DC–DC Converter With Autophase Allocation

Design of Sliding-Mode-Observer-Based Sensorless Control of Boost Converters for High Dynamic Performance

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