Abstract: A brake device for an AC generator, whose speed can be flexibly controlled, and can function properly even when functions of the control unit are lost.

Abstract: A DC/DC converter is described that can output power during both an on-period and an off-period of a switching element. The DC/DC converter may have a transformer and a switching element that may be turned on and off to connect or cut off the primary coil of the transformer. A first rectification device connected between the secondary coil of the transformer and an output terminal makes a first current on a path from the input terminal to the output terminal via the secondary coil to flow during an on-period, and cuts off the first current during an off-period. A second rectification device connected between the primary coil and the output terminal cuts off a second current on a path from the input terminal to the output terminal via the primary coil during the on-period, and makes the second current to flow during the off-period.

Abstract: An electric leakage detecting device using a middle point grounding method in which detection current flowing in the resistors as well as sensitivity for detecting current is kept low.

Abstract: A power factor correction device for three-phase AC-DC conversion enables effective correction and stable power conversion with a simple construction and control system. The device may include input terminals to which three-phase AC is inputted, and Positive and negative electrode terminals each connected to a load device. Transformers each have a primary coil with an end connected to the input terminals. Switching element(s) have ends applied with the voltage of another end of the primary coil, other ends connected to a common potential terminal on the side of the primary coil, and control ends. Rectifying devices have ends applied with the voltage of another end of the secondary coil so as to pass current flow into the positive electrode terminal. A smoothing condenser is disposed between the positive and negative electrode terminals. The control ends of the switching elements are controlled by a control signal having a constant duty ratio.

Abstract: An input voltage control device including a first power line inputted with a voltage of 300V to 380V and a second power line inputted with a voltage of 0V. The potential difference between the first power line and the second power line is variable. A constant voltage generator outputs a constant potential voltage of (24V, for example) to a third power line. A reference potential generator outputs a reference potential of (10V, for example). A comparative potential generator outputs a comparative potential which is within the range of (0V to 24V, for example), based on the input voltage. A comparator outputs to an NMOS transistor a conducting potential voltage of (24V, for example) or an interrupting potential voltage of (0V, for example) depending on the comparison between the reference potential and the comparative potential. When the comparator outputs the conducting potential, the path between the source and drain of the NMOS transistor is made conductive.

Abstract: A current Iin is separated into currents I1 and I2. When I1 flows in a light emitting diode D1, the diode D1 emits light and the current path of a phototransistor Q1 becomes conductive. At that time, current Iout flows in a light emitting diode D2. When the diode D2 emits light, the current path of a phototransistor Q2 becomes conductive, and I2 flows. If the value of the current Iout is large, the light emitting strength of the diode D2 is large. A large current I2 flows in the phototransistor Q2, which decreases the value of the current I1 flowing in the diode D1. As a result, the light emitting strength of the diode D1 becomes small, and the value of the current Iout decreases. In this manner, since a photocoupler P2 functions as a negative feedback circuit, linearity of the current Iin and the current Iout improves.

Abstract: A battery charging apparatus is provided which, without conducting smoothing after an alternating current is rectified, improves the power factor and charges a battery using an output containing a ripple, the battery charging apparatus being capable of generating the output containing a ripple by utilizing a simple configuration and easy control.

Abstract: A brake device for an AC generator, whose speed can be flexibly controlled, and can function properly even when functions of the control unit are lost.

Abstract: An electric leakage detecting device using a middle point grounding method in which detection current flowing in the resistors as well as sensitivity for detecting current is kept low.

Abstract: [PROBLEM TO BE SOLVED] It is an object of the present invention to provide an input voltage control device capable of controlling power supply to each load device based on the voltage level of the DC bus. [SOLUTION] For example, a first power line L1 (a terminal T1) is inputted with a voltage of 300V to 380V and a second power line L2 (a terminal T1) is inputted with a voltage of 0V. The potential difference between the first power line L1 and the second power line L2, or input voltage Vin, is variable. A constant voltage generator 2 outputs a constant potential (voltage of 24V, for example) to a third power line L3. A reference potential generator 3A outputs a reference potential of 10V, for example. A comparative potential generator 4A outputs a comparative potential which is within the range of 0V to 24V, for example, based on the input voltage Vin.

Abstract: A DC/DC converter is described that can output power during both an on-period and an off-period of a switching element. The DC/DC converter may have a transformer and a switching element that may be turned on and off to connect or cut off the primary coil of the transformer. A first rectification device connected between the secondary coil of the transformer and an output terminal makes a first current on a path from the input terminal to the output terminal via the secondary coil to flow during an on-period, and cuts off the first current during an off-period. A second rectification device connected between the primary coil and the output terminal cuts off a second current on a path from the input terminal to the output terminal via the primary coil during the on-period, and makes the second current to flow during the off-period.

Abstract: It is an object of the present invention to provide a power factor correction device for three-phase AC-DC conversion which enables effective power factor correction and stable power conversion with a simple construction and control system.

Abstract: A storage battery or a secondary battery is capable of improving the utilization of an active material and obtaining a high energy density, using raw materials having costs substantially equal to those of a conventional lead storage battery especially as a negative-electrode plate of the secondary battery. The negative-electrode active material for the secondary battery is a kneaded mixture including: a raw active material having a metal and an oxide of the metal; and carbon in such an amount that the total absorption number thereof is at least 4.7 ml per mol of the raw active material, in which the kneaded mixture contains no sulfates or sulfates in an amount of 7×10?2 mol or smaller per mol of the raw active material. The negative-electrode active material has a specific volume of 2.2×10?1 to 5×10?1 ml/g with subjected to no formation. The carbon is acetylene black or furnace carbon.

Abstract: A direction and a magnitude of a current flowing between an external alternating current power source (20) and a load (30) are detected by a current transformer (11). A voltage generated to a secondary winding (11B) of the current transformer as a result of detection is superimposed upon a voltage of the alternating current power source (20), and is supplied to the synchronous power source (S). The synchronous power source (S) generates a voltage having an instantaneous value which is the same as that of the voltage supplied thereto, and applies the generated voltage to the load (30) in parallel. Since the voltage applied by the synchronous power source (S) has a value for lowering the current detected by the current transformer (11), there is substantially no current flowing between the alternating current power source (20) and the load (30).

Abstract: Each of an emitter (E), a first collector (CH) and a second collector (CL) is formed from a first conductivity-type area. A breakdown voltage between the first collector (CH) and the base (B) is greater than a breakdown voltage between the second collector (CL) and the base (B). The base (B) is formed from a second conductivity-type area. A positive electrode of a direct-current power source is connected to the first collector (CH) through a load, a negative electrode thereof is connected to the emitter (E), and a control voltage is applied to the base (B). At this time, if the control voltage is equal to or greater than a value determined based on a current flowing between the second collector (CL) and the base (B), a current flows to the load.

Abstract: A direction and a magnitude of a current flowing between an external alternating current power source (20) and a load (30) are detected by a current transformer (11). A voltage generated to a secondary winding (11B) of the current transformer as a result of detection is superimposed upon a voltage of the alternating current power source (20), and is supplied to the synchronous power source (S). The synchronous power source (S) generates a voltage having an instantaneous value which is the same as that of the voltage supplied thereto, and applies the generated voltage to the load (30) in parallel. Since the voltage applied by the synchronous power source (S) has a value for lowering the current detected by the current transformer (11), there is substantially no current flowing between the alternating current power source (20) and the load (30).

Abstract: The present invention sets forth multiple embodiments of an electrical circuit which rectifies alternating current in a manner which results in very little electrical loss. This is in contrast to conventional rectifier circuits that use simple diode configurations which typically give rise to voltage losses from 0.4 volts to 1.0 volts.

Abstract: The transfer switch (6) supplies the DC voltage supplied from the DC power source section (5), to the commercial electricity system (8) in such a way as to provide the DC voltage with the same polarity as the AC voltage generated by the commercial electricity system (8) according to the control of the commercial voltage monitor section (7) when the absolute value of the voltage of the commercial electricity system (8) is higher than the voltage threshold level. When the absolute value of the AC voltage is lower than the voltage threshold level, the supply of the DC voltage from the DC power source section (5) is interrupted. The generator (2) and the commercial electricity system (8) are isolated from each other by the isolation transformer (4).

Abstract: A LAN tester 1 for carrying out a conduction test, a polarity test and an operation test of LAN wiring includes a power supply section (2) for supplying a power supply current to one of paired signal lines to be tested at one end thereof; a current detecting section (3) for detecting the current flowing through the other of the signal lines; a forward polarity detecting section (4) for detecting positive and negative pulses from positive and negative signal lines, respectively; a reverse polarity detecting section (5) for detecting negative and positive pulses; a first change-over switch (6) for operating the power supply section (2) and the current detecting section (3) in a conduction test mode and operating the forward polarity detecting section (4) and the reverse polarity detecting section (5) in a polarity test mode; and a second change-over switch (7) for realizing an operation test mode by connecting a connection terminal of a transmission signal line and a connection terminal of a reception signal li