Abstract: A power supply system for recovering degraded performance of a solar cell due to PID is provided. The power supply system includes a solar cell, a non-isolated type DC/DC converter that boosts a DC voltage from the solar cell input from an input end with a predetermined boosting ratio and outputs a DC voltage from an output end, and an inverter that converts a DC voltage output from the output end of the DC/DC converter into an AC voltage, the power supply system being connected to an external power system for system interconnection, wherein the power supply system includes a potential adjustment device for applying a voltage of an external power system to the solar cell via the inverter to set a ground potential of a negative electrode of the solar cell to positive when an output of the solar cell is smaller than a predetermined value.

Abstract: In the disclosure, the occurrence of an arc is rapidly detected while the frequency of erroneous detection is suppressed. An arc detecting apparatus includes an arc presence/absence determining part determining presence or absence of an arc based on an AC current measured by a current sensor measuring a current from a solar cell, and a repeat number setting part setting, based on a signal strength of the AC current, a repeat number of processing that the arc presence/absence determining part repeatedly performs to determine the presence or absence of the arc.

Abstract: In the disclosure, the occurrence of an arc is rapidly detected while the frequency of erroneous detection is suppressed. An arc detecting apparatus includes an arc presence/absence determining part determining presence or absence of an arc based on an AC current from a solar cell, and a repeat number setting part setting, based on the DC current from the solar cell, a repeat number of processing that the arc presence/absence determining part repeatedly performs to determine the presence or absence of the arc.

Abstract: A power supply system for recovering degraded performance of a solar cell due to PID is provided. The power supply system includes a solar cell, a non-isolated type DC/DC converter that boosts a DC voltage from the solar cell input from an input end with a predetermined boosting ratio and outputs a DC voltage from an output end, and an inverter that converts a DC voltage output from the output end of the DC/DC converter into an AC voltage, the power supply system being connected to an external power system for system interconnection, wherein the power supply system includes a potential adjustment device for applying a voltage of an external power system to the solar cell via the inverter to set a ground potential of a negative electrode of the solar cell to positive when an output of the solar cell is smaller than a predetermined value.

Abstract: A power conditioner of a photovoltaic system is configured operate at higher accuracy. A chopper circuit, a capacitor connected in parallel to the chopper circuit, and a control circuit that controls an ON/OFF status of switch elements in the chopper circuit to control charging and discharging of the capacitor are provided. The control circuit includes a measurement control section that measures an inter-end voltage of the capacitor and a control circuit section that performs a predetermined control operation from a measurement output of the measurement circuit section. The measurement circuit section includes a differential amplifier circuit that differentially amplifies the inter-end voltage of the capacitor. The circuit control section calibrates an in-phase component in the output of the differential amplifier circuit as an in-phase error and performs the control from the calibrated output from the differential amplifier circuit.

Abstract: The present invention provides a superconductive rotating electric machine drive control system that has higher efficiency and is smaller size and lighter in weight than conventional systems, and also provides a superconductive rotating electric machine drive control method to be implemented in the superconductive rotating electric machine drive control system. By the superconductive rotating electric machine drive control system and the superconductive rotating electric machine drive control method in accordance with the present invention, a control operation is performed so that the field current If2 applied to the superconductive field winding of the synchronous rotating electric machine satisfies an equation for the field current If2 in accordance with the variation of the electric power exchanged between the synchronous rotating electric machine and the power unit.

Abstract: A power conditioner of a photovoltaic system is configured operate at higher accuracy. A chopper circuit, a capacitor connected in parallel to the chopper circuit, and a control circuit that controls an ON/OFF status of switch elements in the chopper circuit to control charging and discharging of the capacitor are provided. The control circuit includes a measurement control section that measures an inter-end voltage of the capacitor and a control circuit section that performs a predetermined control operation from a measurement output of the measurement circuit section. The measurement circuit section includes a differential amplifier circuit that differentially amplifies the inter-end voltage of the capacitor. The circuit control section calibrates an in-phase component in the output of the differential amplifier circuit as an in-phase error and performs the control from the calibrated output from the differential amplifier circuit.

Abstract: The present invention provides a superconductive rotating electric machine drive control system that has higher efficiency and is smaller size and lighter in weight than conventional systems, and also provides a superconductive rotating electric machine drive control method to be implemented in the superconductive rotating electric machine drive control system.

Abstract: It is designed to restrain vibration of a casing, efficiently drive a piezoelectric sounding body (such as a piezoelectric speaker) and flatten sound pressure characteristic within the electronic instrument requiring the miniaturized type, light weight, and thin type in the electronic instrument, in particular the portable telephone. For accomplishing these objects, at a back side of a mass part within the casing of the electronic instrument, the piezoelectric sounding body is mounted via a ring shaped cushioning material. At a part not overlapping with the mass part, a partition is provided. A main air-chamber is tightly formed by the mass part, the piezoelectric sounding body, and the partition, and in the casing within the main air-chamber, a sound issuing hole is formed. The sound outputted from the upper face into the main air-chamber is outputted outside of the casing from the sound issuing hole.

Abstract: The filter apparatus is composed of a filter housing made of non-conductive material, a filter element made of conductive material contained in the filter housing, and a conductive plug with a sealing element. The filter housing has a bore and the conductive plug is inserted into the bore of the filter housing so that the clearance between the conductive plug and the filter housing is hermetically sealed by the sealing element. The conductive plug is connected in circuit to the filter element in a manner that a part of the plug is exposed out of the filter housing and an earth wire attached to the exposed portion of the plug. The static electricity generated in the filter apparatus is released via a conductive path extending from the filter element through the plug to the earth wire so that the electrostatic discharge may be prevented. The conductive plug is made of material having 107 to 1011 &OHgr;·cm resistivity.

Abstract: A small-sized high-precision superconducting magnet apparatus which can prevent an occurrence of the principal factor in generating a quench and can restrain the magnetic flux from varying with time, and a method of regulating the magnetization of such a superconducting magnet apparatus, by which the superconducting magnet apparatus can be uniformly magnetized. Superconducting magnet apparatus of the present invention has: a cooling container; a holding medium for holding a persistent current therein, which is placed in said cooling container and is operative to generate a magnetic flux in a uniform magnetic field region (FOV); static-magnetic-field generating means composed of a plurality of cylinders using superconducting composite plate materials; a cylinder supporting base for holding the plurality of cylinders; and temperature regulating devices (not shown in FIG. 67) embedded in the cylinders, respectively.

Abstract: A laminated superconducting magnet includes a multilayer short-circuit superconductor group 2 formed by uniting superposed hollow superconducting plates, and an exciting coil 3 for inducing a current from an external power source 4 to the multilayer short-circuit superconductor group 2 for operation in a permanent current mode. Even if some of the superconducting plates are quenched, the other normal superconducting plates share the excess current temporarily. Therefore, the entire superconducting magnet is not quenched.

Abstract: A superconducting apparatus is provided with a cryostat, a superconducting magnet contained in the cryostat, an emergency gas discharge pipe connected with the cryostat, and an emergency discharge valve disposed midway of the discharge pipe for discharging to an external environment an emergency discharge gas generated at quenching. In addition, the superconducting apparatus is provided with a gas heating unit for heating the emergency discharge gas flowing inside the discharge pipe.

Abstract: A superconducting magnet abnormality detection and protection apparatus is for early and surely detecting abnormality in superconducting coils mounted on a vehicle and protecting the superconducting coils. Magnetic flux detecting devices are mounted inside an outer vessel, which is a vacuum container of a superconducting magnet, so as to be opposite to the superconducting coil. Voltages induced in the magnetic flux detecting devices are detected. Voltage signals are led to a decision device. By monitoring the change of the voltage signals with time in a comparing judgment device, it is determined whether there is an abnormality. If there is an abnormality, an alarm indicator informs of an abnormal state, and a protection device takes protection measures such as interruption of the current of the superconducting magnet. Owing to such configuration, heat does not penetrate from the outside into the superconducting coil via instrumentation lead wires of the magnetic flux detecting devices.

Abstract: A levitation system of a magnetically levitated train is provided wherein superconducting magnets are installed in a car body, and the first layer and the second layer of levitation coils are so arranged as to be in a shifted location relative to each other in the moving direction of the train. By making the levitation coils two layers and by arranging the two layers in the shifted location relative to each other in the moving direction, amplitude of higher harmonic waves is reduced to a very small level, substantially to zero.

Abstract: Disclosed is a superconductor which has an aluminum area at the center of the cross section of the superconductor and a copper-covered multifilamentary NbTi composite conductor at the periphery parts of the cross section formed around the aluminum area, wherein the cross-sectional area ratio of (Cu+Al)/NbTi is in the range of 0.5 to 3.0 and the cross-sectional area ratio of Al/Cu is in the range of 0.05 to 0.5..

Abstract: A synchrotron radiation utilizing apparatus comprises a generator generating synchrotron radiation, a guide duct for outwardly guiding the synchrotron radiation in a predetermined direction, a plurality of supporting members each supporting one of a plurality of objects which are targets to be irradiated with the synchrotron radiation, the supporting members being disposed at positions distant substantially by an equal distance from the center of rotation of the apparatus, a support base rotatably supporting the supporting members, a first rotating unit rotating each of the supporting members in a predetermined direction, a first control unit applying a control signal to the first rotating unit, a second rotating unit rotating the support base in the plane of the support base in a direction opposite to the direction of rotation of the object supporting members, and a second control unit applying a control signal to the second rotating unit.

Abstract: In a bending magnet, a core which is substantially sectoral or semi-circular in horizontally sectional configuration and in which opposed magnetic poles are formed and a vacuum chamber for storage of a charged particle beam is disposed in a gap between the opposed magnetic poles, and a pair of upper and lower exciting coils for generating a bending magnetic field in the gap between the magnetic poles of core, the reluctance against the magnetic flux passing through a portion of the core adjacent to the inner circumference of the orbit of the charged particle beam and a portion of the core adjacent to the outer circumference of the charged particle beam orbit is equally uniformed over the overall length of the orbit of the charged particle beam.

Abstract: A coolant supply and discharge device for a superconductive rotor including a gaseous coolant withdrawing tube for withdrawing a gaseous coolant located at an end portion of fixed casing enclosing an end portion of the rotor and supporting a coolant feed tube. The withdrawing tube is constituted to withdraw a predetermined amount of gaseous coolant produced in a clearance between the coolant feed tube and a coolant inlet tube located within a rotor shaft to a coolant sump located outside, to avoid introduction of heat into the feed tube from outside.

Abstract: A superconductive coil has both its terminals connected in parallel with a protecting device which has a diode and a unipolar d.c. motor connected in series with each other. The superconductive coil is further connected with an energizing d.c. power source through a switch. The conductive direction of the diode is so selected that the d.c. motor is driven by the energizing energy of the superconductive coil when the switch is opened in the quenching operation of the superconductive coil.