Voltage Ripple Cancellation in Buck Converter based on Hybrid Structured Connection

Kapun, A.; Milanovič, M.; Korelič, Jože

doi:10.1109/epepemc.2006.283397

Cited by 2 publications

(2 citation statements)

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“…The literature [5] uses the concept of current injection to inject a current opposite to the inductor current through an external operational amplifier circuit. However, when this method is applied to a continuous conduction mode (CCM) converter, it will not be able to use the current transformer (CT) to detect the inductor current, and due to the bandwidth limitation, the hall sensor cannot be used.…”

Section: Introductionmentioning

confidence: 99%

Minimization of Output Voltage Ripple of Two-Phase Interleaved Buck Converter with Active Clamp

2021

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A control technique combining pulse width modulation (PWM) and pulse amplitude modulation (PAM) is presented herein to reduce the output voltage ripple of the converter as little as possible. Such a converter requires a two-stage cascaded structure. The first stage is the buck-boost converter, which is used to adjust the output voltage of the second power stage, whereas the second stage is the two-phase interleaved buck converter, which is used to reduce the output voltage ripple. In theory, the two phases of the second stage operate under the condition of individual duty cycles of 50% with a phase difference of 180° between the two, and hence, the currents in the two phases are cancelled for any period of time, thereby making the output voltage of the converter almost voltage-free. Moreover, in order to improve the overall efficiency further, the proposed soft-switching technique based on an active clamp is presented and applied to these two stages to render the main and auxiliary switches turned on with zero-voltage switching (ZVS). Finally, the operating principles and control strategies of the proposed converter are described, and then, their effectiveness is verified by experimental results.

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Section: Introductionmentioning

confidence: 99%

Minimization of Output Voltage Ripple of Two-Phase Interleaved Buck Converter with Active Clamp

2021

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“…Instead of increasing the capacitance, ripple cancellation techniques [14] may be utilised. Over time, numerous current ripple cancellation techniques have been developed for cancelling the input current ripple [15, 16] or the output current ripple [17, 18]. In passive ripple cancellation techniques [15], the current ripple in the filter inductor is reflected to the secondary inductor that is coupled in anti‐parallel to the filter inductor.…”

Section: Introductionmentioning

confidence: 99%

Active current ripple cancellation in parallel connected buck converter modules

Tsang

Foster

Stone

et al. 2013

IET Power Electronics

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Parallel connection of converters has become a popular method of improving efficiency. This study first presents a design technique for a buck converter with two parallelly connected power modules (PMs), where one PM is designed with large current ripple for high efficiency. This study then demonstrates an active current ripple cancellation technique, where the current waveform of the second PM is shaped to be the exact opposite to that in the first PM, to reduce the current ripple as seen by the output capacitor. The factors that affect the overall efficiency in a parallel connected converter and the calculation of the parameters that determine the effectiveness of the ripple cancellation are reported. A prototype parallel converter is designed based on the proposed converter design technique and the current ripple seen by the output capacitor is successfully reduced by 66% with the proposed ripple cancellation technique, under different line and load conditions. & The Institution of Engineering and Technology 2013 Subscript m, x and i are also used with the list of symbol above to distinguish the parameters for the main PM, auxiliary PM and interleaved converter PM (e.g. δ m , δ x and δ i are the duty cycles for the main PM, auxiliary PM and interleaved PM, respectively).

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Voltage Ripple Cancellation in Buck Converter based on Hybrid Structured Connection

Cited by 2 publications

References 0 publications

Minimization of Output Voltage Ripple of Two-Phase Interleaved Buck Converter with Active Clamp

Minimization of Output Voltage Ripple of Two-Phase Interleaved Buck Converter with Active Clamp

Active current ripple cancellation in parallel connected buck converter modules

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