Autonomous detection of rapid shutdown condition
AssigneeLunar Energy, Inc.
InventorMark Holveck
Life of this patent
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Abstract
A rapid shutdown system includes a PV (photovoltaic) generator. It further includes a DC (Direct Current)-DC converter receiving power from the PV generator and outputting power. The DC-DC converter outputs power at a high voltage state or a low voltage state. It further includes a DC bus coupled to the DC-DC converter to receive the power outputted by the DC-DC converter. The DC bus is coupled to a system comprising a load. The DC-DC converter transitions from the high voltage state to the low voltage state based at least in part on an output current of the DC-DC converter transitioning below a threshold.
Claims14
A rapid shutdown system comprising:
- a plurality of PV (photovoltaic) generators;
- a plurality of DC (Direct Current)-DC converters that are connected in series, wherein each DC-DC converter in the plurality of DC-DC converters receives power from a PV generator in the plurality of PV generators and outputs power, wherein each DC-DC converter outputs power at a high voltage state or a low voltage state;
- and
- a DC bus coupled to the plurality of DC-DC converters to receive power outputted by the plurality of DC-DC converters;
- wherein the DC bus is coupled to a system comprising a load;
- and
- wherein each individual DC-DC converter in the plurality of DC-DC converters is configured to autonomously transition from operating in the high voltage state to the low voltage state based at least in part on local detection of both first and second conditions comprising, respectively:
- an output current of a DC-DC converter being below a threshold current for at least a threshold amount of time;
- and
- an output voltage of the DC-DC converter, measured relative to a node common to the plurality of DC-DC converters, meeting a voltage limit of the high voltage state.
A method, comprising:
- receiving, by a DC (Direct Current)-DC converter in a plurality of DC-DC converters that are connected in series, power from a PV (photovoltaic) generator in a plurality of PV generators;
- outputting power by the DC-DC converter, wherein the DC-DC converter outputs power at a high voltage state or a low voltage state;
- wherein a DC bus is coupled to the plurality of DC-DC converters to receive power outputted by the plurality of DC-DC converters, and wherein the DC bus is coupled to a system comprising a load;
- and
- autonomously transitioning, by the DC-DC converter from operating in the high voltage state to the low voltage state based at least in part on local detection of both first and second conditions comprising, respectively:
- an output current of the DC-DC converter being below a threshold current for at least a threshold amount of time;
- and
- an output voltage of the DC-DC converter, measured relative to a node common to the plurality of DC-DC converters, meeting a voltage limit of the high voltage state.
Dependencies are inferred from the claim text.