The invention relates to a vehicle electrical system that includes a first energy accumulator which has a first maximum open circuit voltage when the first energy accumulator is fully charged, and a second energy accumulator which has a second maximum open-circuit voltage when the second energy accumulator is fully charged. The second maximum open circuit voltage is higher than the first maximum open circuit voltage. The vehicle electrical system also includes a generator configured to generate electrical energy for the vehicle electrical system and a control unit that is configured to detect a recuperation mode of the vehicle. The control unit is also configured to cause the generator, while the vehicle is in the recuperation mode, to generate electrical energy with a charge voltage which is in or above a buffer voltage range, wherein the buffer voltage range lies between the first maximum open circuit voltage and the second maximum open circuit voltage.

A DC voltage grid includes an electrical conductor electrically interconnecting electrical components, with a DC voltage applied between parts of the electrical conductor. An actuator is configured to vary the DC voltage such that a value of the DC voltage depends on at least one state of the DC voltage grid. Information about the at least one state is transmitted to the electrical components of the DC voltage grid by way of the DC voltage. A wind farm having wind turbines connected to such a DC voltage grid and a method for operating such a DC voltage grid or such a wind farm are also disclosed. The DC voltage of the DC voltage grid is controlled or regulated depending on a state of the DC voltage grid.

A DC voltage grid includes an electrical conductor electrically interconnecting electrical components, with a DC voltage applied between parts of the electrical conductor. An actuator is configured to vary the DC voltage such that a value of the DC voltage depends on at least one state of the DC voltage grid. Information about the at least one state is transmitted to the electrical components of the DC voltage grid by way of the DC voltage. A wind farm having wind turbines connected to such a DC voltage grid and a method for operating such a DC voltage grid or such a wind farm are also disclosed. The DC voltage of the DC voltage grid is controlled or regulated depending on a state of the DC voltage grid.

A power distribution system for an electric aircraft includes a first electric propulsion unit comprising at least two power stages; a first battery pack electrically connected to a first power stage of the at least two power stages; a second battery pack electrically connected to a second power stage of the at least two power stages; and a control system configured to control the first battery pack, the second battery pack, the first power stage, and the second power stage to transfer power from the first battery pack to the second battery pack through the first power stage and the second power stage.

A power receiving apparatus includes a communication unit capable of communicating with a power supply apparatus, and a control unit that, based on information relating to power which the power supply apparatus is capable of supplying, determines whether or not to perform an authentication communication with the power supply apparatus to authenticate whether or not the power supply apparatus is a predetermined apparatus. The control unit requests the power supply apparatus to supply first power regardless of whether or not the power supply apparatus is the predetermined apparatus, in a case where the authentication communication is not performed, and the control unit requests the power supply apparatus to supply second power in a case where the authentication communication is performed and the power supply apparatus is authenticated as the predetermined apparatus.

A power receiving apparatus includes a communication unit capable of communicating with a power supply apparatus, and a control unit that, based on information relating to power which the power supply apparatus is capable of supplying, determines whether or not to perform an authentication communication with the power supply apparatus to authenticate whether or not the power supply apparatus is a predetermined apparatus. The control unit requests the power supply apparatus to supply first power regardless of whether or not the power supply apparatus is the predetermined apparatus, in a case where the authentication communication is not performed, and the control unit requests the power supply apparatus to supply second power in a case where the authentication communication is performed and the power supply apparatus is authenticated as the predetermined apparatus.

In a line to line fault detection and protection system, a source end power supply supplies power to a remote load over a transmission line and monitors the dynamic behavior of a transmission line power characteristic. If that dynamic behavior is outside a constraint that is actively imposed on the transmission line dynamic behavior by a load end power conditioning system, a possible line to line fault is recognized. The preferred power characteristic is current and the preferred constraint is a maximum rate of change of current drawn from the transmission line by the load end power conditioning system.

A method for monitoring one or more characteristics of an ultracapacitor is provided. The method includes obtaining a plurality of voltage measurements. Each of the voltage measurements can be obtained sequentially at one of a plurality of intervals. Furthermore, each of the voltage measurements can be indicative of a voltage across the ultracapacitor. The method can include determining an actual voltage step of the ultracapacitor based on two consecutive voltage measurements of the plurality of voltage measurements. The method can further include determining whether the actual voltage step exceeds a threshold voltage step of the ultracapacitor. Furthermore, in response to determining the actual voltage step exceeds the threshold voltage, the method can include providing a notification associated with performing a maintenance action on the ultracapacitor.

The technology relates to techniques for redundant power distribution and monitoring for lighter than air (LTA) vehicles. A power distribution and monitoring system for an LTA vehicle, can include two or more redundant controllers coupled to a multiplexer in a crossbar architecture. Each controller can control the multiplexer and inhibit the other controller in the case of a failure of the other controller. Each controller can control a power switch to direct power from a power source to an electronic component, and can monitor the power source. In some cases, a first controller receives a signal indicting a failure in a second controller, and the first controller inhibits the second controller and directs power from the power source to the electronic component.

The present invention provides a chip comprising a circuit module, a power switch and a detection and control circuit. The power switch is coupled between a supply voltage and the circuit module, and is used to selectively connect the supply voltage to the circuit module, and control a current amount flowing into the circuit module according to at least a control signal. The detection and control circuit is coupled to the power switch, and is used to detect a first signal generated by a first circuit positioned surrounding the circuit module, and compare the first signal with a second signal in a real-time manner to generate the control signal to adjust the current amount flowing into the circuit module.