Dual Modulation Technique for High Efficiency in High-Switching Buck Converters Over a Wide Load Range

Tsai, Jang-Zern; Huang, Tsung-Ying; Lai, Wang-Wei; Chen, Ke-Horng

doi:10.1109/tcsi.2011.2142970

Cited by 35 publications

(11 citation statements)

References 32 publications

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“…In Fig. 5, the comparator output shows DT = 9%, which agrees with that predicted by (4), whereas the inductor current has D = 68%, which agrees with that calculated by (1) assuming   90% (reported later in Fig. 7).…”

Section: Resultssupporting

confidence: 86%

“…a battery) and the sensor electronics to provide a stable output voltage and efficiently transfer the energy from the battery to the electronics. However, the efficiency of a switching dc/dc converter operating in a conventional pulsewidth modulation (PWM) is not as good as expected under light-load conditions [4]. This is because PWM involves a fixed switching frequency that generates significant switching losses.…”

Section: Introductionmentioning

confidence: 99%

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Efficiency Optimization in Burst-Mode Buck DC/DC Converters for Sensor Nodes

2018

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In autonomous sensor nodes, switching dc/dc converters are usually employed to power the sensor electronics and also to maintain the operating voltage of an energy transducer around its maximum power point. In such a context, this paper optimizes the power efficiency of buck dc/dc converters when operating in burst mode, which is preferable than the conventional pulse-width modulation technique in lowpower sensor applications. The optimization is carried out by selecting an optimal inductor current to efficiently transfer the energy from the input to the output during the burst. Such optimization is applied when regulating the converter's output voltage, which corresponds to the supply voltage of the sensor electronics, and also the input voltage, which corresponds to the operating voltage of the energy transducer that is here a photovoltaic module. The theoretical analysis and the experimental results reported herein prove the existence of such an optimal inductor current in both scenarios. Experimental tests with a commercial buck dc/dc converter (TPS62750) show that the use of this optimal inductor current provides up to 9% increase in efficiency, thus prolonging the operating lifetime of the sensor node.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Efficiency Optimization in Burst-Mode Buck DC/DC Converters for Sensor Nodes

2018

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“…Buck converters are indispensable in most battery-powered devices due to their simple power conversion step and high power efficiency. To maintain high power efficiency over a wide range of load currents, dual-mode PWM/PFM buck converters are widely used [19,20]. Figure 1 shows a simplified schematic diagram of our EMI-improved buck converter, along with the concept for a SiP buck converter powered by a battery represented by a voltage source (VBAT).…”

Section: Sip Dual-mode Pwm/pfm Buck Converter With Chaos-based Emi Rementioning

confidence: 99%

Active EMI Reduction Using Chaotic Modulation in a Buck Converter with Relaxed Output LC Filter

et al. 2018

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DC-DC buck converters are widely used in portable applications because of their high power efficiency. However, their inherent fast switching releases electromagnetic emissions, making them prominent sources of electromagnetic interference (EMI). This paper proposes a voltage-controlled buck converter that reduces EMI by using a chaotic pulse-width modulation (PWM) technique based on a chaotic triangular ramp generator. The chaotic triangular ramp generator is constructed from a simple on-chip chaotic circuit linked with a symmetrically triangular ramp circuit. The proposed converter can thus operate in the chaotic mode reducing the EMI without requiring any EMI filters. Additionally, using the triangular ramp signal can relax the requirement for a large LC output filter in chaotic mode. The effectiveness of the proposed scheme was experimentally verified with a chaotic triangular ramp generator embedded in a voltage-mode controller buck converter using a 0.18 µm Complementary Metal Oxide Semiconductor (CMOS) process. The measurement results from a prototype showed that the EMI improvement from the proposed scheme is approximately 14.53 dB at the fundamental switching frequency with respect to the standard fixed-frequency PWM reference case.

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“…The design of the converter involves the selection of the switching frequencies for the switches, and the LC low-pass filters that meet the transient performance requirement, the bandwidth (BW) in (1), and the current and voltage ripples (ΔI and ΔV ) in (2) and 3, respectively. The capacitance must also satisfies the overshoot requirement in (4)…”

Section: Parallel Buck Convertermentioning

confidence: 99%

“…As switching losses dominate under light load conditions, numerous control techniques that reduce the converter switching frequency and/or skipping some of the switching cycles during light load conditions have been developed to improve the light load efficiency [1][2][3][4][5][6]. The improvement from these techniques is, however limited, since the converter still has to satisfy all the system requirements across the different load conditions.…”

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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Dual Modulation Technique for High Efficiency in High-Switching Buck Converters Over a Wide Load Range

Cited by 35 publications

References 32 publications

Efficiency Optimization in Burst-Mode Buck DC/DC Converters for Sensor Nodes

Efficiency Optimization in Burst-Mode Buck DC/DC Converters for Sensor Nodes

Active EMI Reduction Using Chaotic Modulation in a Buck Converter with Relaxed Output LC Filter

Active current ripple cancellation in parallel connected buck converter modules

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