A power converter circuit to convert multiple direct current (dc) inputs to one or more dc outputs. This dc-dc power converter allows its load to be powered by multiple,...
A power converter circuit to convert multiple direct current (dc) inputs to one or more dc outputs. This dc-dc power converter allows its load to be powered by multiple, different sources of various voltage and current levels (such as solar panels, batteries, fuel cells, etc.). This converter has both buck and boost capability.
This circuit can simultaneously draw power from several dc electrical energy sources of different kinds (such as solar panels, batteries, fuel cells, etc.). The circuit topology is capable of an arbitrary number of input sources of different voltage/current/power levels. There is a single output voltage that can directly supply a load, or can supply another power converter. The default circuit uses an inductor, but it may be substituted with a transformer to provide electrical isolation or multiple output as well. The power flow from each source can be controlled separately in order to optimize the power flow characteristics for cost, environmental protection, or any other performance objective. Low power applications regulate source switching with a control circuit. High power applications regulate and optimize flow characteristics with a digital signal processor (DSP). This circuit contains a minimum number of components which reduce overall complexity and cost when compared to other implementations. In addition, due to efficiency in design, this circuit can be scaled to work across a multitude of power ranges.
Applications:
This technology can be used in any application which uses multiple dc energy sources and in situations where backup or simultaneous alternative energy sources are used. Such sources include solar cells, fuel cells, batteries, and thermoelectric sources.
Benefits:
Simple: Designed with minimal parts, allowing for reduced complexity in design and higher reliability.
Low Cost: Requires fewer inductors and transistors when compared to equivalent dc-dc converters, therefore manufacturing costs are reduced.
Efficient: Less loss and higher conversion efficiency due to the minimal design parts.
Adaptable: Easily integrated into existing systems and combined with other converters (i.e. ac-dc).
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The combination of a unique series-input parallel-output (SIPO) circuit configuration and a sensorless current mode (SCM) technique ensures automatic and nearly perfect...
The combination of a unique series-input parallel-output (SIPO) circuit configuration and a sensorless current mode (SCM) technique ensures automatic and nearly perfect load sharing of multiple dc:dc converters even during fast dynamic changes.
A power supply in an embodiment of the invention includes a plurality of dc--dc switching power converters, each of which has its input isolated from its output. The power converters are arranged with their respective inputs being series connected and their respective outputs being parallel connected in an embodiment of the invention. In another embodiment of the inputs are parallel connected and the outputs series connected. Each power converter includes an input filter in each of said dc--dc switching power converters and an output filter. Each power converter includes a sensorless current mode control circuit controlling its switching duty ratio.
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Hot-spotting is a common problem in solar panel configurations that can potentially damage photovoltaic cells by forcing the conduction of reverse current in shaded or...
Hot-spotting is a common problem in solar panel configurations that can potentially damage photovoltaic cells by forcing the conduction of reverse current in shaded or dysfunctional cells. The proposed invention offers a solution at the modular level by incorporating the photovoltaic panel into an open circuit to prevent hot-spotting. As a result, other panels in the photovoltaic string will remain functional under all adverse conditions.
Researchers from the University of Illinois have developed a method and apparatus to protect solar cells from hot spotting and damage resulting from arc faults. This device would also provide a way to shut off the solar array remotely. By preventing the damage caused by hot spotting and arc faults this device increases the longevity of solar arrays. It also reduces the risk of fire and provides a remote way to cut the power in cases of emergency.
