This paper proposes an innovative dual-input dual-output (DIDO-DC) DC-DC converter for the DC microgrid applications. The proposed converter is derived from the classic buck-boost DC-DC converter. The converter has fo...
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ISBN:
(纸本)9781538693155
This paper proposes an innovative dual-input dual-output (DIDO-DC) DC-DC converter for the DC microgrid applications. The proposed converter is derived from the classic buck-boost DC-DC converter. The converter has four IGBTs, two inductors, two filter capacitors and three diodes to integrate two input sources and two loads. Using this converter topology, both the loads can be powered even when one of the input sources is not available. Compared to the conventional topologies, the proposed topology has fewer component counts and low voltage stresses which improve the converter efficiency. The output voltage expressions of the DIDO-DC converter are derived from the analytical waveforms for the buck-boost mode of operation. To verify the operation of the converter, the simulation studies have been carried out using PSCAD 4.5.1 (R) software. The experimental prototype of the converter is fabricated and tested successfully in the laboratory. The measured experimental results are also presented in this paper. Finally, the performance comparison of the DIDO-DC converter with the conventional topologies is discussed.
A novel single-inductor dual-input dual-output dc-dc converter with pulse width modulation control is proposed for a solar energy harvesting system. The first input of the converter is from photovoltaic (PV) cells and...
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A novel single-inductor dual-input dual-output dc-dc converter with pulse width modulation control is proposed for a solar energy harvesting system. The first input of the converter is from photovoltaic (PV) cells and the second input is a rechargeable battery. Apart from the conventional role of providing a regulated output voltage to power the loading circuits, the converter also clamps the PV cells' voltage to the maximum power point value to maximize efficiency. When the PV cells harvest more power than the load, the surplus energy is used to charge the rechargeable battery. When the PV cells cannot harvest sufficient power, the converter schedules the PV cells and the battery to power the load together. A test chip was fabricated using a 0.35-mu m CMOS process and measured to verify the operation of the proposed dc-dc converter and to demonstrate the power transfer efficiency of the solar power management system.
Mode noise suppression in off-axis integrated cavity output spectroscopy (OA-ICOS) is a key for improving the signal-to-noise ratio (SNR) of a sensor system, which basically depends on the ability to smooth out the ca...
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Mode noise suppression in off-axis integrated cavity output spectroscopy (OA-ICOS) is a key for improving the signal-to-noise ratio (SNR) of a sensor system, which basically depends on the ability to smooth out the cavity mode structure and to reduce the cavity mode linewidth. We demonstrated a novel dual-input dual-output (DIDO) coupling scheme of OA-ICOS for mode noise suppression. The influences of beam splitting ratio and light reflection number to the output intensity and cavity mode linewidth were theoretically studied. Experimental investigation on the suppression of cavity mode noise was carried out in terms of detection sensitivity and SNR through methane (CH4) measurements. A SNR of 221 and a detection sensitivity of 1.73 x 10(-8) cm(-1) Hz(-1/2) was obtained for the DIDO-based OA-ICOS sensor system. The SNR was improved by a factor of similar to 2.5 and the sensitivity was improved by a factor of similar to 2.2 compared to the regular single-input single-output (R-SISO) approach. Multi-input multi-output (MIMO) configuration was further numerically studied to verify the noise suppression ability of this detection concept. This work reveals a new laser-to-cavity coupling method and provides a novel way to exploit OA-ICOS sensors with improved SNR and sensitivity.
This article proposes a continuously scalable-conversion-ratio (CSCR) switched-capacitor (SC) energy harvesting interface that extracts power from a thermoelectric generator (TEG), regulates a 0.75-V output load, and ...
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This article proposes a continuously scalable-conversion-ratio (CSCR) switched-capacitor (SC) energy harvesting interface that extracts power from a thermoelectric generator (TEG), regulates a 0.75-V output load, and manages a 1.2-1.45-V battery. The structure employs the proposed CSCR SC converter to improve the power conversion efficiency up to 7.9% higher than that of the conventional converter. Moreover, the structure utilizes a proposed SC-based pulse frequency modulation (PFM) maximum power point tracking (MPPT) method to extract power from a TEG with an MPPT efficiency above 98.15%. In addition, the proposed interface adopts a flying capacitor sharing scheme for the dual-mode operation of the SC interface to increase both the peak end-to-end efficiency and maximum output power. With a 180-nm CMOS process, the proposed interface achieves a peak end-to-end efficiency of 85.4% and maximum output power of 20.8 mW.
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