A Novel Control Scheme of Synchronous Buck Converter for ZVS in Light-Load Condition

Wang, Jianmin; Wu, Sen‐Tung; Jane, Gwan-Chi

doi:10.1109/tpel.2011.2142324

Cited by 25 publications

(8 citation statements)

References 18 publications

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“…As mentioned above, current flow into the corresponding anti-parallel diodes of the slave power switches will result in higher conduction losses and lower efficiency. In order to improve the efficiency, the proposed converter uses synchronous rectifier technology [33,34].…”

Section: Synchronous Rectification Mode Of the Proposed Convertermentioning

confidence: 99%

Common Grounded H-Type Bidirectional DC-DC Converter with a Wide Voltage Conversion Ratio for a Hybrid Energy Storage System

Wang

2018

Energies

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Hybrid energy storage systems (HESS) play an important role in maintaining the power balance of a direct current (DC) micro-grid. A HESS is mainly composed of high power density super-capacitors (SCs) and high energy density batteries. According to the operational requirements of an SC, a bidirectional DC-DC converter with the characteristics of a good dynamic response and a wide voltage conversion ratio is needed to interface the SC and a high-voltage DC bus. In this paper, a novel common grounded H-type bidirectional converter characterized by a good dynamic response, a low inductor current ripple, and a wide voltage conversion ratio is proposed. In addition, it can avoid the narrow pulse of pulse width modulation (PWM) voltage waveforms when a high voltage conversion ratio is achieved. All of these features are beneficial to the operation of the SC connected to a DC bus. The operating principle and characteristics of the proposed converter are presented in this paper. A 320 W prototype with a wide voltage conversion ranging from 3.3 to 8 in step-up mode and 1/8 to 1/3 in step-down mode has been constructed to validate the feasibility and effectiveness of the proposed converter.

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Section: Synchronous Rectification Mode Of the Proposed Convertermentioning

confidence: 99%

Common Grounded H-Type Bidirectional DC-DC Converter with a Wide Voltage Conversion Ratio for a Hybrid Energy Storage System

Wang

2018

Energies

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“…Thus, this paper proposes a method to set an empirical value for the peak voltage. The reference value is generally close to the maximum supply voltage of the IC, and thus Δv C = 4 V. The capacitor voltage parameters can be deduced from (1) and (2), like so…”

Section: Design Criteriamentioning

confidence: 99%

“…1, the circuit structure of the synchronous buck converter (SBC) has advantages, including simple scheme, low cost, and high efficiency. At a heavy load, the SBC can utilise a synchronous rectifying (SR) switch (Q B ) to reduce conduction loss and to improve the system conversion efficiency [2,3]. However, to achieve a fast transient response and high power density, the SBC requires the use of a smaller filtering inductor, would cause the SR topology to have a low efficiency at a light load [4][5][6] because of the greater conduction and gate-drive losses.…”

Section: Introductionmentioning

confidence: 99%

Sensorless control scheme for synchronous buck converter

Wang

2016

IET Circuits, Devices & Systems

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The synchronous buck converter (SBC) with traditional pulse-width modulation has several disadvantages, such as poor efficiency at light loads. Therefore, this study proposes a new control technique for the SBC that allows power switches to operate with quasi-resonant valley switching in light load conditions. The voltage ripple produced during the capacitor charging and discharging processes is utilised to simulate an inductor current ripple, and thus the zero position of the inductor current can be emulated without requiring a current sensor. The technique has several advantages, including easily built-in integrated circuits. A 5-V/25-W SBC laboratory prototype was implemented to verify the feasibility of the proposed technology and control scheme, and the experimental findings were satisfactory.

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“…Nevertheless, any important applications of the buck converter are associated with low output currents where the dynamics of the buck converter may behave as an underdamped oscillator [ 19 ]. The voltage specifications of mobile devices working in stand by mode is a prominent example of an application of the buck converter in the light load regime, where the efficiency of the converter is of utter importance for minimizing the battery drain [ 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Single-Switching Reachable Operation Points in a DC-DC Buck Converter: An Approximation from Time Optimal Control

2020

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In this paper, we study the time optimal control problem in a DC-DC buck converter in the underdamped oscillatory regime. In particular, we derive analytic expressions for the admissible regions in the state space, satisfying the condition that every point within the region is reachable in optimal time with a single switching action. We then make use of the general result to establish the minimum and maximum variation allowed to the load in two predefined design set-ups that fulfills the time optimal single switching criteria. Finally, we make use of numerical simulations to show the performance of the proposed control under changes in the reference voltage and load resistance.

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A Novel Control Scheme of Synchronous Buck Converter for ZVS in Light-Load Condition

Cited by 25 publications

References 18 publications

Common Grounded H-Type Bidirectional DC-DC Converter with a Wide Voltage Conversion Ratio for a Hybrid Energy Storage System

Common Grounded H-Type Bidirectional DC-DC Converter with a Wide Voltage Conversion Ratio for a Hybrid Energy Storage System

Sensorless control scheme for synchronous buck converter

Single-Switching Reachable Operation Points in a DC-DC Buck Converter: An Approximation from Time Optimal Control

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