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This research proposes an LED driving circuit with stand-alone photovoltaic (PV) power. A bi-directional converter is incorporated to adequately distribute powers among the solar-cell panel, the battery and the LED lamp according to the sunshine intensity, the battery state-of-charge as well as the load requirement. By matching the voltage-current (V-I) characteristic curves, the capacities of the...
This paper proposes a discharging scenario for a battery power bank configured by battery power modules (BPMs) connected in series. Each BPM in the power bank is formed by a lithium-ion battery pack with an associated buck-boost converter. Charge equalization among batteries can be executed by controlling the battery currents in accordance with the real-time estimated state-of-charges (SOCs) by the...
Batteries in battery power modules (BPMs) are independently controlled and thus can be isolated from the battery power source without interrupting the system operation when they have been damaged, exhausted, or fully charged. At the transient of isolating, however, resonances may occur among the inductor and capacitor, leading to high voltage and current stresses on the circuit components and spikes...
This research is focused on the estimation and calibration of state-of-charge (SOC) and state-of-health (SOH) for lithium-ion batteries, on basis of coulomb counting process. The proposed method is aimed to provide an accurate and easy-to-use solution for online indication of battery statuses without the need of sophisticated calculations or intricate information. With real-time coulomb counting,...
An equivalent electric circuit model is used to interpret the dynamic behavior of a photo-voltaic (PV) panel with a power electronic converter. The power electronic converter used for maximum power point tracking (MPPT) draws rippled currents from the PV panel. The circuit model is derived on basis of the static single-diode model, in which, the threshold voltage is approximately identical to the...
This paper proposes a charging scenario of a battery power bank constructed by a number of buck-boost type battery power modules (BPMs) in parallel. With associated power electronic converters, the BPMs in the power bank can be individually controlled. The charging scenario is programmed to fully utilize the available power from the dc source, and at the same time to perform charge equalization during...
The operation of a battery power bank with the buck-boost type battery power modules (BPMs) is studied. All BPMs in the power bank are collaboratively to cope with the load requirements but substantially are operated individually. They can be scheduled to discharge currents from batteries in accordance with their state-of-charges (SOCs) and the operating modes of the converters. The operations of...
A battery power system configured by arrayed battery power modules (BPMs) is presented. Each BPM consists of a battery pack equipped with an associated bi-directional power electronic converter for charging and discharging. The number of BPMs in the array is schemed to cope with the required output voltage, current, power as well as sustainable energy. All BPMs in the configuration are mutually interactive...
A battery power system can be assembled by a number of battery power modules (BPMs) to higher voltage and current in addition to provide a higher sustainable energy. In which, the battery sets are equipped with associated power electronic converters to regulate the conversion power as well as the output voltage and current. When a bidirectional power converter is adopted in a BPM the battery set is...
The operation of a battery power bank with buck-boost battery power modules (BPMs) connected in series is studied. With serial configuration, the output currents of all BPMs are the same as the load current. However, the currents from batteries can be scheduled in accordance with the state-of-charges (SOCs) by adjusting the duty-ratios of the associated power converters for balanced discharging. With...
This paper proposes a power conversion circuit for the high-brightness white LED lamp powered by the solar-cell panel with a subsidiary battery set. The system operation is illustrated by five states according to the power flowing among the solar panel, the battery set, and the LED lamp under different sunlight intensities. A laboratory circuit designed for an 18 W LED lamp is built and tested to...
This paper proposes a three-port dc-to-dc power conversion circuit for small-scale distributed generation systems. With the three-port converter, the load can be powered from two different dc sources, which can be a combination of two from a solar-cell panel, a fuel-cell set, a battery bank, etc. The power conversion circuit consists of two active power switches by commonly using an inductor and an...
This paper proposes a battery power module (BPM) which is composed of two batteries with a tri-port dc-to-dc converter. Being powered from two battery sets, the capacity of the BPM can be doubled. The power conversion circuit consists of only an active power switch, leading to less conversion loss. By adjusting the duty-ratio of the active power switch, the voltage regulation at the output as well...
This paper proposed a three-port dc-to-dc converter, by which the load can be powered from two different dc sources. The power conversion circuit consists of only an active power switch with associated passive components. By adjusting the duty-ratio of the active power switch, the power sharing between two power sources as well as the output voltage regulation can be made. Theoretical analyses are...
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