Adaptively controlling drive strength of multiplexed power from supply power rails in a power multiplexing system to a powered circuit is disclosed. A power multiplexing circuit in the power multiplexing system includes a plurality of supply selection circuits (e.g., head switches) each coupled between a respective supply power rail and an output power rail coupled to the powered circuit. The power multiplexing circuit is configured to activate a selected supply selection circuit to switch coupling of an associated supply power rail to the output power rail to power the powered circuit. In one example, the supply selection circuits each include a plurality of power switch selection circuits coupled to an associated supply power rail. The power switch selection circuits are configured to be activated and deactivated by a control circuit to adjust drive strength of a multiplexed supply power rail based on operational conditions, which can account for performance variations.

The invention concerns a method for managing a system for supplying a vehicle electrical system with electrical energy, comprising the steps consisting of: •supplying the electrical system with electrical energy via the additional electrical energy storage device and the DC/DC converter when the switch is open; •regulating the electrical energy generator to supply voltage lower than that imposed by the DC/DC converter and higher than a voltage of the electrical energy storage device; •closing the switch such that the DC/DC converter imposes a voltage on the electrical system that is higher than that of the electrical energy storage device and the electrical energy generator; •applying a voltage to the electrical system from the electrical energy generator that is higher than that of the DC/DC converter; and deactivating the DC/DC converter.

An electrical interconnection circuit can be used with a solid-state-transformer (SST) system. The interconnection circuit includes medium voltage direct current (MVDC) to low voltage direct current (LVDC) direct current to direct current (DC/DC) converters, independent LVDC buses respectively connected to one of the MVDC to LVDC DC/DC converters, and an interconnecting DC/DC converter connecting at least two of the independent LVDC buses in order to ensure equal power demand from each MVDC to LVDC DC/DC converters. The interconnecting DC/DC converter is configured to re-route power between the plurality of independent LVDC buses. A power rating of the interconnecting DC/DC converter is set according to power to be rerouted from other LVDC buses via the interconnecting DC/DC converter.

In general, techniques are described that are directed to a device having a first power storage device and a second power storage device connected in series. A first power converter may generate, using electrical energy sourced from the first power storage device and the second power storage device, a first power signal to power a first set of components. A second power converter may generate, using electrical energy sourced from the first power storage device and not the second power storage device, a second power signal to power a second set of components.

A power supply apparatus supports USB-PD (Universal Serial Bus-Power Delivery) specification. A bus voltage V.sub.BUS is transmitted via a bus line. A first power supply circuit generates a first bus voltage having a first voltage level. A second power supply circuit generates a second bus voltage having a second voltage level that is higher than the first voltage level. A first switch is arranged between the bus line and an output terminal of the first power supply circuit. A second switch is arranged between the bus line and an output terminal of the second power supply circuit. A control circuit receives a control signal S1 via the bus line from a power receiving apparatus, which is a power supply target. The control circuit is structured to control the first switch and the second switch based on the control signal S1.

The present DC power supply and distribution system comprises: a plurality of power distribution lines each connected to a respective one of a plurality of loads; a first converter to receive an AC voltage from a commercial AC power source, convert the received AC voltage into a plurality of DC voltages and supply each of the plurality of DC voltages to a respective one of the plurality of power distribution lines; a second converter to receive a DC power from a power generating and/or storing source, convert the received DC power into a plurality of DC powers, and supply each of the plurality of DC powers to a respective one of the plurality of power distribution lines; and a controller to enhance the second converter in efficiency by controlling the first converter so that a ratio of the plurality of DC voltages is a predetermined first ratio.

Systems and techniques are provided for a power receiver circuit. A power generating mechanism may include power generating elements that may generate alternating current signals. Rectifier circuit may include rectifiers that may generate a direct current signal from an alternating current signal, and diodes. Group circuits that may connect groups of rectifier circuits in electrical circuits to combine the direct current signals from the rectifier circuits in a group into a single direct current signal. A step down converter may be connected to the group circuits. The step down converter may convert a direct current signal to a direct current signal of a target voltage level. An output switch may be connected to the step down converter. A linear regulator may be connected to the step down converter. A microcontroller may be connected to the linear regulator and the output switch and may control the output switch.

An electrical power unit with wireless communications capability includes a wireless communications module supported in a housing that is configured to be mounted at or along a work surface. The wireless communications module includes an audio speaker, a microphone, a wireless audio signal receiver, and a wireless audio signal transmitter. The wireless signal receiver is operable to receive first electronic audio signals from a first mobile communication device, and the audio speaker is operable to emit amplified sound in response to the wireless signal receiver receiving the first electronic audio signals. The wireless audio signal transmitter is operable to receive second electronic audio signals from the microphone, and to transmit the second electronic audio signals to the mobile communication device for further transmission from the first mobile communication device to a second communication device located remotely from the electrical power unit and the first mobile communication device.

A DC connection system for renewable power generators includes a first monopole DC collection network, a second monopole DC collection network and a first bipole transmission system. The first monopole DC collection network aggregates positive-valued DC voltage outputs of a first cluster of renewable power generators onto a positive terminal of the first monopole DC collection network. The second monopole DC collection network aggregates negative-valued DC voltage outputs of a second cluster of renewable power generators onto a negative terminal of the second monopole DC collection network. The first bipole transmission system is coupled to the positive and negative terminals of the monopole DC collection networks, for transferring the aggregated power to a power grid substation.

A motor vehicle has a high-voltage battery and two separate electric machines. Each electric machine is associated with a power electronics unit, and each power electronics unit has a DC-to-DC converter. Each DC-to-DC converter is designed to reduce a high voltage of the high-voltage battery to a predetermined voltage. The two DC-to-DC converters of the two power electronics units are connected electrically in parallel and are set to different voltage values.