An AC power supply includes a digital feedback loop for output regulation. The feedback loop generates an RMS control signal that is mixed with a desired waveform to produce an input for a feedback loop that generates an instantaneous control signal. The instantaneous control signal is used to regulate power supply output.

A semiconductor device includes: a power switch connecting an internal power supply in which power is not shut down and an internal power supply in which power is shut down; and an internal voltage determining circuit for determining voltage of the internal power supply in which power is shut down. Voltage of the internal power supply in which power is shut down is generated from external power supply voltage by using a regulator circuit. When the power of the internal power supply is interrupte...

A management system that manages a use status of a plurality of devices that are connected a plurality of power supply systems provided in a facility to be used, includes a plurality of reporting apparatuses attached to the devices, and a management apparatus, wherein each of the reporting apparatuses includes a first output unit which outputs device identification information required to identify a corresponding one of the devices when the corresponding one attached to the reporting apparatus i...

A power supply controller determines the value of an input power and uses the value of the input power to regulate a value of the output voltage.

In a method of calculating effective power relating to a capacitor, the waveform of a periodic voltage applied to a capacitor is set. The capacitance of a desired capacitor is input. The waveform of the periodic voltage applied to both ends of the capacitor is subjected to Fourier expansion. More specifically, the periodic voltage is Fourier-expanded in terms of sine and cosine-wave series of high-order frequency components. Further, an effective power consumed by the capacitor is calculated usi...

A speed synchronizer for master and slave engines is disclosed. The speed controller of the slave engine is adjustable by a manual actuator and also by a servo actuator. The servo actuator is responsive to a circuit which develops a correction signal corresponding to the difference between engine speed signals. A transfer mechanism selectively transmits movement of either the manual actuator or the servo actuator to the speed controller. The transfer mechanism comprises first and second levers r...

A method and system for providing performance estimations for a specified power budget provides an indication of the impact on processing performance when closed-loop power/performance control is employed to meet the specified power budget. A workload, which may be the actual workload, or a test workload is run to determine actual power consumption at intervals during the execution of the workload. The power values are examined and if they exceed the specified budget, which may be one of multipl...

Provided is an electrical test device having multi-meter functionality and being adapted to provide current sourcing to an electrical system for selective measurement of a plurality of parameters. The electrical test device comprises a conductor probe element, a power supply, a processor and a display device. The power supply is interconnected between an external power source and a probe element. The processor is connected to the probe element and is configured to provide an input signal to the ...

An electronic power-measurement device with intelligent agent includes a power measurement unit, an intelligent agent and a communication unit. The device can commonly assess data necessary for works, as an intelligent agent is mounted on the electronic power-measurement device, although the manufacturers of the devices and hardware structure based on types of the devices are different from each other. Also, the device can select only data suitable to a high level service and can selectively ass...

A self-healing power grid control system includes a power grid having a plurality of network islands with a plurality of linear and non-linear loads. A plurality of control sensors communicate with the power grid to monitor the electrical characteristics of the power grid. A plurality of controlled relays are in electrical communication with the plurality of non-linear loads. A battery energy storage system (ESS) is in electrical communication with a main power source and a network island. A fir...