The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
Azita Emami - One of the best experts on this subject based on the ideXlab platform.
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a biofuel cell based energy harvester with 86 peak efficiency and 0 25 v Minimum Input Voltage using source adaptive mppt
IEEE Journal of Solid-state Circuits, 2021Co-Authors: Arian Hashemi Talkhooncheh, Abhinav Agarwal, Minwo Wang, Gudrun Hoskuldsdottir, William Weiting Kuo, Kuanchang Chen, Wei Gao, Azita EmamiAbstract:This article presents an efficient cold-starting energy harvester system, fabricated in 65-nm CMOS. The proposed harvester uses no external electrical components and is compatible with biofuel-cell (BFC) Voltage and power ranges. A power-efficient system architecture is proposed to keep the internal circuitry operating at 0.4 V while regulating the output Voltage at 1 V using switched-capacitor dc–dc converters and a hysteretic controller. A startup enhancement block is presented to facilitate cold startup with any arbitrary Input Voltage. A real-time on-chip 2-D maximum power point tracking with source degradation tracing is also implemented to maintain power efficiency maximized over time. The system performs cold startup with a Minimum Input Voltage of 0.39 V and continues its operation if the Input Voltage degrades to as low as 0.25 V. Peak power efficiency of 86% is achieved at 0.39 V of Input Voltage and 1.34 $\mu \text{W}$ of output power with 220 nW of average power consumption of the chip. The end-to-end power efficiency is kept above 70% for a wide range of loading powers from 1 to 12 $\mu \text{W}$ . The chip is integrated with a pair of lactate BFC electrodes with 2 mm of diameter on a prototype-printed circuit board (PCB). Integrated operation of the chip with the electrodes and a lactate solution is demonstrated.
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A Fully-Integrated Biofuel-Cell-Based Energy Harvester with 86% Peak Efficiency and 0.25V Minimum Input Voltage Using Source-Adaptive MPPT
2020 IEEE Custom Integrated Circuits Conference (CICC), 2020Co-Authors: Arian Hashemi Talkhooncheh, Abhinav Agarwal, Kuan-chang Xavier Chen, Minwo Wang, Gudrun Hoskuldsdottir, You Yu, Azita EmamiAbstract:This paper presents a cold-starting energy harvester in 65nm CMOS with source degradation tracking and automatic MPPT. A power-efficient architecture is proposed to keep the internal circuitry operating at 0.4V while regulating the output Voltage at 1V using switched-capacitor DC-DC converters and a hysteresis controller. Peak efficiency of 86% is achieved at 0.39V Input Voltage and 1.34μW of output power with 220nW of internal average power consumption. Integrated operation with lactate biofuel cells is demonstrated.
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a fully integrated biofuel cell based energy harvester with 86 peak efficiency and 0 25v Minimum Input Voltage using source adaptive mppt
Custom Integrated Circuits Conference, 2020Co-Authors: Arian Hashemi Talkhooncheh, Abhinav Agarwal, Kuan-chang Xavier Chen, Minwo Wang, Gudrun Hoskuldsdottir, William Weiting Kuo, Wei Gao, Azita EmamiAbstract:This paper presents a cold-starting energy harvester in 65nm CMOS with source degradation tracking and automatic MPPT. A power-efficient architecture is proposed to keep the internal circuitry operating at 0.4V while regulating the output Voltage at 1V using switched-capacitor DC-DC converters and a hysteresis controller. Peak efficiency of 86% is achieved at 0.39V Input Voltage and $1.34\mu\mathrm{W}$ of output power with 220nW of internal average power consumption. Integrated operation with lactate biofuel cells is demonstrated.
Michael A E Andersen - One of the best experts on this subject based on the ideXlab platform.
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high efficiency isolated boost dc dc converter for high power low Voltage fuel cell applications
IEEE Transactions on Industrial Electronics, 2010Co-Authors: Morten Nymand, Michael A E AndersenAbstract:A new design approach achieving very high conversion efficiency in low-Voltage high-power isolated boost dc-dc converters is presented. The transformer eddy-current and proximity effects are analyzed, demonstrating that an extensive interleaving of primary and secondary windings is needed to avoid high winding losses. The analysis of transformer leakage inductance reveals that extremely low leakage inductance can be achieved, allowing stored energy to be dissipated. Power MOSFETs fully rated for repetitive avalanches allow primary-side Voltage clamp circuits to be eliminated. The oversizing of the primary-switch Voltage rating can thus be avoided, significantly reducing switch-conduction losses. Finally, silicon carbide rectifying diodes allow fast diode turn-off, further reducing losses. Detailed test results from a 1.5-kW full-bridge boost dc-dc converter verify the theoretical analysis and demonstrate very high conversion efficiency. The efficiency at Minimum Input Voltage and maximum power is 96.8%. The maximum efficiency of the proposed converter is 98%.
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a new approach to high efficiency in isolated boost converters for high power low Voltage fuel cell applications
International Power Electronics and Motion Control Conference, 2008Co-Authors: Morten Nymand, Michael A E AndersenAbstract:A new low-leakage-inductance low-resistance design approach to low-Voltage high-power isolated boost converters is presented. Very low levels of parasitic circuit inductances are achieved by optimizing transformer design and circuit lay-out. Primary side Voltage clamp circuits can be eliminated by the use of power MOSFETs fully rated for repetitive avalanche. Voltage rating of primary switches can now be reduced, significantly reducing switch on-state losses. Finally, silicon carbide rectifying diodes allow fast diode turn-off, further reducing losses. Test results from a 1.5 kW full-bridge boost converter verify theoretical analysis and demonstrate very high efficiency. Worst case efficiency, at Minimum Input Voltage maximum power, is 96.8 percent and maximum efficiency reaches 98 percent.
Arian Hashemi Talkhooncheh - One of the best experts on this subject based on the ideXlab platform.
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a biofuel cell based energy harvester with 86 peak efficiency and 0 25 v Minimum Input Voltage using source adaptive mppt
IEEE Journal of Solid-state Circuits, 2021Co-Authors: Arian Hashemi Talkhooncheh, Abhinav Agarwal, Minwo Wang, Gudrun Hoskuldsdottir, William Weiting Kuo, Kuanchang Chen, Wei Gao, Azita EmamiAbstract:This article presents an efficient cold-starting energy harvester system, fabricated in 65-nm CMOS. The proposed harvester uses no external electrical components and is compatible with biofuel-cell (BFC) Voltage and power ranges. A power-efficient system architecture is proposed to keep the internal circuitry operating at 0.4 V while regulating the output Voltage at 1 V using switched-capacitor dc–dc converters and a hysteretic controller. A startup enhancement block is presented to facilitate cold startup with any arbitrary Input Voltage. A real-time on-chip 2-D maximum power point tracking with source degradation tracing is also implemented to maintain power efficiency maximized over time. The system performs cold startup with a Minimum Input Voltage of 0.39 V and continues its operation if the Input Voltage degrades to as low as 0.25 V. Peak power efficiency of 86% is achieved at 0.39 V of Input Voltage and 1.34 $\mu \text{W}$ of output power with 220 nW of average power consumption of the chip. The end-to-end power efficiency is kept above 70% for a wide range of loading powers from 1 to 12 $\mu \text{W}$ . The chip is integrated with a pair of lactate BFC electrodes with 2 mm of diameter on a prototype-printed circuit board (PCB). Integrated operation of the chip with the electrodes and a lactate solution is demonstrated.
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A Fully-Integrated Biofuel-Cell-Based Energy Harvester with 86% Peak Efficiency and 0.25V Minimum Input Voltage Using Source-Adaptive MPPT
2020 IEEE Custom Integrated Circuits Conference (CICC), 2020Co-Authors: Arian Hashemi Talkhooncheh, Abhinav Agarwal, Kuan-chang Xavier Chen, Minwo Wang, Gudrun Hoskuldsdottir, You Yu, Azita EmamiAbstract:This paper presents a cold-starting energy harvester in 65nm CMOS with source degradation tracking and automatic MPPT. A power-efficient architecture is proposed to keep the internal circuitry operating at 0.4V while regulating the output Voltage at 1V using switched-capacitor DC-DC converters and a hysteresis controller. Peak efficiency of 86% is achieved at 0.39V Input Voltage and 1.34μW of output power with 220nW of internal average power consumption. Integrated operation with lactate biofuel cells is demonstrated.
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a fully integrated biofuel cell based energy harvester with 86 peak efficiency and 0 25v Minimum Input Voltage using source adaptive mppt
Custom Integrated Circuits Conference, 2020Co-Authors: Arian Hashemi Talkhooncheh, Abhinav Agarwal, Kuan-chang Xavier Chen, Minwo Wang, Gudrun Hoskuldsdottir, William Weiting Kuo, Wei Gao, Azita EmamiAbstract:This paper presents a cold-starting energy harvester in 65nm CMOS with source degradation tracking and automatic MPPT. A power-efficient architecture is proposed to keep the internal circuitry operating at 0.4V while regulating the output Voltage at 1V using switched-capacitor DC-DC converters and a hysteresis controller. Peak efficiency of 86% is achieved at 0.39V Input Voltage and $1.34\mu\mathrm{W}$ of output power with 220nW of internal average power consumption. Integrated operation with lactate biofuel cells is demonstrated.
David P Arnold - One of the best experts on this subject based on the ideXlab platform.
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a Voltage multiplying self powered ac dc converter with 0 35 v Minimum Input Voltage for energy harvesting applications
Applied Power Electronics Conference, 2011Co-Authors: Shuo Cheng, Rutvik Sathe, Raj Dayal Natarajan, David P ArnoldAbstract:This paper demonstrates a highly efficient, low-Voltage ac/dc converter using a Voltage multiplier (octupler) circuit architecture intended for vibrational energy harvesting applications where a low-Voltage ac waveform is used to charge a battery. The circuit employs output-powered active diodes and does not require any external power supply or startup circuitry. The circuit rectifies and boosts Input ac Voltages in the range of 0.35–2 V and 20–500 Hz to a dc Voltage output that is ∼8 times higher than the Input amplitude. The circuit can cold-start from an Input Voltage of 0.5 V or higher, providing an output Voltage sufficient to charge a 3.7 V lithium ion battery. Once started, the circuit can maintain operation at Input Voltage amplitudes as low as 0.35 V. Over 80% efficiency is achieved from 20 Hz to 100 Hz, with output power ranging from a few microwatts to one milliwatt. Furthermore, in testing with an actual electrodynamic (magnetic) vibrational energy harvester that generates >0.5 V ac output, the circuit delivers power to a lithium-ion battery with an efficiency of >80%.
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a Voltage multiplying self powered ac dc converter with 0 35 v Minimum Input Voltage for energy harvesting applications
IEEE Transactions on Power Electronics, 2011Co-Authors: Shuo Cheng, Rutvik Sathe, Raj Dayal Natarajan, David P ArnoldAbstract:This paper demonstrates a highly efficient, low-Voltage ac/dc converter using a Voltage multiplier (octupler) circuit architecture intended for vibrational energy harvesting applications where a low-Voltage ac waveform is used to charge a battery. The circuit employs output-powered active diodes and does not require any external power supply or startup circuitry. The circuit rectifies and boosts Input ac Voltages in the range of 0.35-2 V and 20-500 Hz to a dc Voltage output, that is, ~8 times higher than the Input amplitude. The circuit can cold start from an Input Voltage of 0.5 V or higher, providing an output Voltage sufficient to charge a 3.7-V lithium ion battery. Once started, the circuit can maintain operation at Input Voltage amplitudes as low as 0.35 V. Over 80% efficiency is achieved from 20 to 100 Hz, with output power ranging from a few microwatts to 1 mW. Furthermore, in testing with an actual electrodynamic (magnetic) vibrational energy harvester that generates >;0.5-V ac output, the circuit delivers power to a lithium ion battery with an efficiency of >;80%.
Abhinav Agarwal - One of the best experts on this subject based on the ideXlab platform.
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a biofuel cell based energy harvester with 86 peak efficiency and 0 25 v Minimum Input Voltage using source adaptive mppt
IEEE Journal of Solid-state Circuits, 2021Co-Authors: Arian Hashemi Talkhooncheh, Abhinav Agarwal, Minwo Wang, Gudrun Hoskuldsdottir, William Weiting Kuo, Kuanchang Chen, Wei Gao, Azita EmamiAbstract:This article presents an efficient cold-starting energy harvester system, fabricated in 65-nm CMOS. The proposed harvester uses no external electrical components and is compatible with biofuel-cell (BFC) Voltage and power ranges. A power-efficient system architecture is proposed to keep the internal circuitry operating at 0.4 V while regulating the output Voltage at 1 V using switched-capacitor dc–dc converters and a hysteretic controller. A startup enhancement block is presented to facilitate cold startup with any arbitrary Input Voltage. A real-time on-chip 2-D maximum power point tracking with source degradation tracing is also implemented to maintain power efficiency maximized over time. The system performs cold startup with a Minimum Input Voltage of 0.39 V and continues its operation if the Input Voltage degrades to as low as 0.25 V. Peak power efficiency of 86% is achieved at 0.39 V of Input Voltage and 1.34 $\mu \text{W}$ of output power with 220 nW of average power consumption of the chip. The end-to-end power efficiency is kept above 70% for a wide range of loading powers from 1 to 12 $\mu \text{W}$ . The chip is integrated with a pair of lactate BFC electrodes with 2 mm of diameter on a prototype-printed circuit board (PCB). Integrated operation of the chip with the electrodes and a lactate solution is demonstrated.
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A Fully-Integrated Biofuel-Cell-Based Energy Harvester with 86% Peak Efficiency and 0.25V Minimum Input Voltage Using Source-Adaptive MPPT
2020 IEEE Custom Integrated Circuits Conference (CICC), 2020Co-Authors: Arian Hashemi Talkhooncheh, Abhinav Agarwal, Kuan-chang Xavier Chen, Minwo Wang, Gudrun Hoskuldsdottir, You Yu, Azita EmamiAbstract:This paper presents a cold-starting energy harvester in 65nm CMOS with source degradation tracking and automatic MPPT. A power-efficient architecture is proposed to keep the internal circuitry operating at 0.4V while regulating the output Voltage at 1V using switched-capacitor DC-DC converters and a hysteresis controller. Peak efficiency of 86% is achieved at 0.39V Input Voltage and 1.34μW of output power with 220nW of internal average power consumption. Integrated operation with lactate biofuel cells is demonstrated.
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a fully integrated biofuel cell based energy harvester with 86 peak efficiency and 0 25v Minimum Input Voltage using source adaptive mppt
Custom Integrated Circuits Conference, 2020Co-Authors: Arian Hashemi Talkhooncheh, Abhinav Agarwal, Kuan-chang Xavier Chen, Minwo Wang, Gudrun Hoskuldsdottir, William Weiting Kuo, Wei Gao, Azita EmamiAbstract:This paper presents a cold-starting energy harvester in 65nm CMOS with source degradation tracking and automatic MPPT. A power-efficient architecture is proposed to keep the internal circuitry operating at 0.4V while regulating the output Voltage at 1V using switched-capacitor DC-DC converters and a hysteresis controller. Peak efficiency of 86% is achieved at 0.39V Input Voltage and $1.34\mu\mathrm{W}$ of output power with 220nW of internal average power consumption. Integrated operation with lactate biofuel cells is demonstrated.