A 5MHz, 24V-to-1.2V, AO2T current mode buck converter with one-cycle transient response and sensorless current detection for medical meters

Ke, Xugang; Sankman, Joseph; Ma, Dongsheng

doi:10.1109/apec.2016.7467857

Cited by 12 publications

(5 citation statements)

References 4 publications

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“…In practice, this means two levels of learning, Algorithms 2 and 3. According to the dimensionality of the chosen problem in (14), reducing the dimensionality for the chosen example leads to two linear equations (see Appendix A). In the methodology presented here, the final optimization model mapping is a bijection of the full subsets of the Banach space.…”

Section: Results Of Identification Applied On Two-phase Interleaved D...mentioning

confidence: 99%

“…In deriving the models, n processes must be provided for identification. Each process is dedicated to one phase of the IBC and provides the mapping of the common input vector of the states x to a phase duty cycle d i in (14). By analogy with [31], the fuzzy rules per phase are as follows:…”

Section: Created and Based Accordingly On Their Parameter Set θmentioning

confidence: 99%

“…In the (2n + 1)-dimensional normed space of stable points, we have to define our new mapping (14). Despite the analytical state space model, which can be derived but extended by using integer programming equations for discrete states that switch the modes of the converter, our new mapping ( 14) is a product of inverse modelling thanks to identification, where the new state variables are the duty cycles d = [d 1 , .…”

Section: Created and Based Accordingly On Their Parameter Set θmentioning

confidence: 99%

“…This is not the typical solution without a current sensor providing additional circuitry for voltage measurement but is less costly and physically complex for typical current sensors. A more advanced circuit for determining the current values in the respective converter branch is described in [14]. Based on the voltage waveform, conclusions can be drawn about the currents in the individual branches.…”

Section: Introductionmentioning

confidence: 99%

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Compensation of the Current Imbalance of an Interleaved DC–DC Buck Converter, Sensorless Online Solution Based on Offline Fuzzy Identification and Post-Linearization

2023

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This paper presents a new approach to compensate for the current imbalance of an interleaved DC–DC buck converter (IBC), in which the current sensors are not involved in the operation of the converter when it is connected to an invariable load. The current sensors are only used during the offline identification process that builds the universal fuzzy model of the converter’s steady states. Model building involves an upstream identification phase, followed by further dimensionality reduction of the model and error minimization. The method presented here discusses the mathematical complexity of the analytical modelling of hybrid systems and opposes it with a complexity-reduced identification by learning from data. An offline rendered model of the stable and steady states of the IBC is used as a mapping of the required inverter output current to n-fold asymmetric duty cycles, which are distributed among the IBC phases to allow arbitrarily accurate load sharing. The mapping is carried out in the mathematically normalized space of variables or in the physical sense RMS values, achieving the desired robustness in a noisy environment and stability. The final and canonical feedback control is built from the standard and optimized PI controller, which is compensated by the identified IBC model correction. The only measured feedback of the whole controller is the output voltage. Even when applied to the simulation model (physical MATLAB platform) of a two-phase IBC with the built-in system asymmetry, the presented methodology is also applicable to the n-phase IBC without loss of generality.

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Section: Results Of Identification Applied On Two-phase Interleaved D...mentioning

confidence: 99%

Section: Created and Based Accordingly On Their Parameter Set θmentioning

confidence: 99%

Section: Created and Based Accordingly On Their Parameter Set θmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Compensation of the Current Imbalance of an Interleaved DC–DC Buck Converter, Sensorless Online Solution Based on Offline Fuzzy Identification and Post-Linearization

2023

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“…Fig. 1 is the circuit of the synchronous buck circuit [20,21,22,23,24]. From the above analysis, it can be known that the circuit will operate in the DCM mode under light load operating conditions.…”

Section: Architecture Of Wide Input Voltage Range Dc-dc Buck Convertermentioning

confidence: 99%

A wide input voltage range DC-DC Buck converter with dynamically modified ZCD circuit

Lin,

Chai,

Fan

et al. 2024

IEICE Electron. Express

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This article proposes a wide input voltage range DC-DC buck converter based on AOT control mode, which can be used in lowpower applications such as the Internet of Things and automotive chips. It includes a zero current detector circuit that dynamically modifies the offset voltage, which can detect the inductor current when the buck circuit is operating in DCM mode. By turning off the power transistor in time, the control loss of the buck circuit can be reduced to improve efficiency. The proposed buck converter is designed using 0.18μm standard CMOS process. When a 12V standard input voltage is used to generate a 5V output voltage, the minimum inductor current can reach about 100uA when the low power transistor is turned off when the load current is in the light load range of 1mA-100mA, and the maximum efficiency can be achieved at light load of 93.7%.

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Motivation for High-Vin Converters and Fundamentals

Wittmann¹

2019

Integrated High-Vin Multi-MHz Converters

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A 5MHz, 24V-to-1.2V, AO2T current mode buck converter with one-cycle transient response and sensorless current detection for medical meters

Cited by 12 publications

References 4 publications

Compensation of the Current Imbalance of an Interleaved DC–DC Buck Converter, Sensorless Online Solution Based on Offline Fuzzy Identification and Post-Linearization

Compensation of the Current Imbalance of an Interleaved DC–DC Buck Converter, Sensorless Online Solution Based on Offline Fuzzy Identification and Post-Linearization

A wide input voltage range DC-DC Buck converter with dynamically modified ZCD circuit

Motivation for High-Vin Converters and Fundamentals

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