The present document describes a method for analyzing the performance of a leg of a cable communication network which uses a network power supply as the power source therefor, the method using a switched-mode power supply device and comprising: electrically connecting an AC output of the switched-mode power supply device to an auxiliary power input of a cable network access device thereby providing an electrical connection to the leg of the cable communication network; switching the power source from the network power supply to the switched-mode power supply thereby providing an AC voltage to the leg of the cable communication network by the switched-mode power supply; performing a diagnosis of the performance of the leg of a cable communication network by controlling a characteristic of the AC voltage being provided to the leg of the cable communication network by the switched-mode power supply.

Disclosed is a power network system etc. which can safely detach a power router whose communication with a control apparatus becomes interrupted, from other power routers and power cells, the power network system including a second control apparatus controlling one of or plural of the power cells, when the second control apparatus detects abnormality in communication between the apparatus itself and the power router, the second control apparatus performs control so as to stop transmission/reception between the power router in which the abnormality is detected and another power router which is connected to the power router, and when the first control apparatus included in the power router detects abnormality in communication between the power router and the second control apparatus, the first control apparatus performs control so as to stop transmission/reception of the power conversion leg connected to the another power router.

Disclosed is a power network system etc. which can safely detach a power router whose communication with a control apparatus becomes interrupted, from other power routers and power cells, the power network system including a second control apparatus controlling one of or plural of the power cells, when the second control apparatus detects abnormality in communication between the apparatus itself and the power router, the second control apparatus performs control so as to stop transmission/reception between the power router in which the abnormality is detected and another power router which is connected to the power router, and when the first control apparatus included in the power router detects abnormality in communication between the power router and the second control apparatus, the first control apparatus performs control so as to stop transmission/reception of the power conversion leg connected to the another power router.

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.

A voltage control system includes a first voltage converter, a second voltage converter and a voltage monitoring module. The first voltage converter is coupled to a first power source and configured to convert first electrical energy of the first power source into a first output voltage. The second voltage converter is coupled to a second power source and configured to convert second electrical energy of the second power source into a second output voltage. The voltage monitoring module is coupled to the first voltage converter and the second voltage converter. The voltage monitoring module is configured to regulate the first output voltage or the second output voltage by controlling the first voltage converter and the second voltage converter according to the first output voltage and the second output voltage.

A power transmission system includes: a power transmitter connected to a power supply; a plurality of power receivers respectively connected to a plurality of loads; a power transmission line connecting the power transmitter and the plurality of power receivers; and a controller. The controller acquires information on optimum power for maximizing transmission efficiency in the power transmission line and information on power demands requested by the loads, and routes transmission power from the power transmitter selectively to the plurality of power receivers. The transmission power is equal to or smaller than the optimum power. When a total power demand is larger than the optimum power, the controller requests another controller to supply supplementary power. When the total power demand is smaller than the optimum power, the controller notifies the other controller that surplus power is available.

A power transmission system includes: a power transmitter connected to a power supply; a plurality of power receivers respectively connected to a plurality of loads; a power transmission line connecting the power transmitter and the plurality of power receivers; and a controller. The controller acquires information on optimum power for maximizing transmission efficiency in the power transmission line and information on power demands requested by the loads, and routes transmission power from the power transmitter selectively to the plurality of power receivers. The transmission power is equal to or smaller than the optimum power. When a total power demand is larger than the optimum power, the controller requests another controller to supply supplementary power. When the total power demand is smaller than the optimum power, the controller notifies the other controller that surplus power is available.

An electrical power or data system includes an electrical power or data supply cord and an intermediate power or data cord, a first electrical power or data outlet receptacle disposed between the supply cord and the intermediate cord, and a second electrical power or data outlet receptacle at a distal end of the intermediate cord. The first electrical power or data outlet is positionable below a work surface, while the second electrical power or data outlet is mountable to the work surface. At least one of the electrical cords may include a self-retracting cord section.

An electrical power or data system includes an electrical power or data supply cord and an intermediate power or data cord, a first electrical power or data outlet receptacle disposed between the supply cord and the intermediate cord, and a second electrical power or data outlet receptacle at a distal end of the intermediate cord. The first electrical power or data outlet is positionable below a work surface, while the second electrical power or data outlet is mountable to the work surface. At least one of the electrical cords may include a self-retracting cord section.

A test system is disclosed. The test system includes a programmable switching array including input terminals, output terminals, and an array of programmable switches configured for selectively connecting any one of the input terminals to any one of output terminals; and a current supply device comprising a multiplexed digital bus and a plurality of a power supplies connected in parallel between the multiplexed digital bus and the input terminals of the programmable switching array.