Abstract: A battery charging device provided with: a bridge-type controlled rectifier circuit having three-phase thyristors for rectifying the output of a three-phase AC generator and supplying a charging current to a battery; and a controller for controlling the supplying of a trigger signal to the thyristors in accordance with the terminal voltage of the battery; the controller being configured so that the trigger signal is supplied to the thyristors simultaneously when it is detected that the terminal voltage of the battery is equal to or lower than a set voltage, and supplying of the trigger signal is stopped when a certain period has elapsed after the terminal voltage exceeds the set voltage, in order to prevent commutation failure of the thyristors when charging of the battery is stopped, and prevent overcharging of the battery.

Abstract: A power generation system may include a generator and a power converter coupled to the generator. The power converter may include a plurality of bridge circuits coupled in parallel. Each bridge circuit may be coupled to an inductor. In addition, the power converter may include a plurality of parallel shorting devices. The shorting devices may be coupled to the bridge circuits such that an impedance of the inductors is effectively coupled between the shorting devices and the generator.

Abstract: An electricity generation device includes a permanent-magnet electric generator with three or more phase windings each having an output terminal and connected to a neutral point, and bidirectional semiconductor switching circuits capable of interrupting connections between the respective phase windings and the neutral point. Each switching circuit allows current to flow in both directions. A gate signal generation circuit outputs to one of the switching circuits during a period including the time at which the AC voltage excited in the corresponding phase winding turns from positive to negative and during a period including the time at which the AC voltage excited in the corresponding phase winding turns from negative to positive. A startup gate signal output circuit outputs a startup gate signal to all of the bidirectional semiconductor switching circuits when the permanent-magnet electric generator is to be started.

Abstract: A control section is configured to, when it is detected that a voltage of a B-terminal of a power generator has exceeded a first predetermined voltage value, turn on all switching elements of a negative arm of a bridge circuit connected to one set of armature windings and turn off all switching elements of a positive arm, and reduce a field current flowing in a field winding. The control section is configured to thereafter turn off all the turned-on switching elements when a predetermined condition is satisfied.

Abstract: Described is a method for starting up a system for generating electrical power. The system includes a turbine that is mechanically connected to a generator, while the generator is electrically connected via a converter to a load, in particular to a power supply grid. The generator includes a total number of windings. With at least one embodiment of the method, a number of generator windings are combined at low rotational speeds of the turbine, wherein the combined number of windings is less than the total number of windings.

Abstract: An electric machine selectively operates as a generator mode or a motor mode. The electric machine includes a stator core, a multi-phase armature winding, a field coil, a moving core having a plurality of salient poles so as to move relative to the stator core to cross the magnetic field. Field current is supplied to the field coil differently according to operation mode. A portion of the armature winding is short-circuited to form an additional magnetic field that has a phase different from the magnetic field of the field coil. Therefore, the rotary core moves relative to the stator core when the operation mode is in the motor mode.

Abstract: A rotary electric machine has two sub-windings shifted by 30 degrees from each other. Each sub-winding is connected to an individual bridge which has MOS transistors on the ground sides. It is possible to supply a charging current even at a low rotational speed by switching the MOS transistors at a high-frequency. The basic components of magnetic force are canceled because of the shifted sub-windings. The switching components of the magnetic forces generated by the switching operation are canceled by switching two groups of the MOS transistors in opposite states. As a result, it is possible to decrease the magnetic noise significantly.

Abstract: A controlled rectifier bridge for a generator having a plurality of phase windings and one exciter winding is constructed as a self-controlled rectifier bridge with MOS field effect transistor. To allow the use of such a rectifier bridge upon a fast load reduction with an attendant load-dump voltage, a voltage protection circuit is employed that feeds the energy, stored in the exciter winding upon a fast shutoff, back into the battery, thus deexciting the exciter winding. Upon a fast load reduction, the generator windings are short-circuited by suitable triggering of the low- or high-side transistors.

Abstract: Leading current or lagging current of an alternator is supplied by a simple structure including short-circuit switch elements. The short-circuit switch elements are connected across output terminals of the alternator three-phase armature windings, and are turned on and off at fixed timings to supply a suitable amount of the leading current to armature windings regardless of the rotational speed. Thus, the leading current can be supplied without phase-leading-capacitors so that the apparatus can be made compact, lightweight and powerful. Even if any of the short-circuit switch elements can not turn off, the battery discharge can be prevented.

Abstract: A charging system for charging plural batteries from a generating coil without requiring a separate isolator to protect the circuit in the event of battery failure. The circuit includes a rectifying diode circuit including a plurality of parallel diode paths between the ends of generating coil and the terminals of the battery. There are a number of diode circuits at least equal to the number of batteries.

Abstract: A voltage regulator for an internal combustion engine having a permanent magnet alternator and utilizing an SCR/diode bridge rectifier includes crowbar SCR overvoltage protection means. To assure that the crowbar SCR has an adequate period in which to cool off after being triggered on by an overvoltage surge, crowbar SCR operation is detected to generate a control signal to activate a timer which shuts off gate drive to the main bridge SCR's and thereby shuts down the bridge for a period of time sufficient to provide crowbar SCR recovery and cool off. In its preferred embodiment, the control signal is provided by the crowbar SCR gate to cathode voltage drop during protective operation, which signal is of relatively long duration, thus allowing the use of filters to eliminate spurious triggering of the timer by transient noise signals. Feedback from the switch means supplying gate drive to the bridge SCR's is used to provide a tapered charging characteristic.

Abstract: Disclosed herein is a regulator circuit for regulating the charging of a battery from a source of alternating current wherein the regulator circuit includes a rectifier having first and second pairs of terminals. Alternating current, applied to the first pair of terminals, is converted to a unidirectional charge current for application to the battery through the second pair of terminals. Circuitry, responsive to the voltage at the first pair of terminals, inhibits the generation of the charge current when the voltage at the first pair of terminals reaches a predetermined threshold. Additional circuitry, also responsive to the voltage at the first pair of terminals, provides a low impedence path across the second pair of terminals. Upon the occurrence of an overvoltage condition, the production of charge current by the rectifier is inhibited and any capacitance coupled to the charge current output circuit is discharged through the low impedence path provided across the second pair of terminals.

Abstract: A current interruption type ignition system for an internal combustion engine comprises an ignition coil including a primary coil portion and a secondary coil portion; an exciter inducing an AC voltage in synchronism with rotation of the engine to be supplied to the primary coil portion of the ignition coil; a first semiconductor switch provided in parallel to the primary coil portion to conduct a current from the exciter therethrough; a second semiconductor switch provided on a controlled terminal of the first semiconductor switch so that the second semiconductor switch, upon conduction, causes the first semiconductor switch to be turned off so as to abruptly conduct a primary current into the primary coil portion of the ignition coil; and a signal source generating an ignition signal at the ignition position of the engine.

Abstract: A voltage regulator for use with a polyphase magneto generator and in combination with a rectifier circuit provided to rectify the output of the generator to charge a battery, comprises at least two thyristors having the anodes respectively connected to the output terminals of the generator having phases adjacent to each other, having the cathodes connected to the negative output terminal of the rectifier circuit, and having the gates connected to each other. A trigger device is adapted to supply gate signals to the gates of the thyristors when the voltage of the output terminal having a phase in advance of the phases of the output terminals to which the anodes of the thyristors are connected exceeds a predetermined value. As the battery terminal voltage is excessive the thyristors are rendered conductive to short-circuit the output of the generator.

Abstract: A voltage regulator for a magneto AC generator comprising a battery charging generator coil and a loading generator coil, said voltage regulator comprising a first voltage divider to detect a voltage proportional to a terminal voltage of a battery; a second voltage divider to detect a voltage proportional to an output voltage of the loading generator coil; and a controlled rectifier arranged to short-circuit the battery charging generator coil and adapted to be conductive when either of the voltages detected by the first and second voltage dividers is greater than a predetermined value, the battery charging and loading generator coils being arranged to be magnetically bonded with each other.

Abstract: A constant voltage device for a magneto alternating current generator comprises a silicon controlled rectifier and a trigger signal generator circuit which comprises a voltage divider, a constant voltage element connected between the voltage divider and a gate of the silicon controlled rectifier and further a capacitor for forming a series-parallel delay circuit together with the voltage divider and for phase controlling the silicon controlled rectifier.

Abstract: This invention relates to a method for preventing premature ignition in an ignition device for the internal combustion engine including a non-contact type ignition circuit for the internal combustion engine, particularly an ignition circuit for the internal combustion engine in which an inductive current in the form of an AC waveform induced in a primary winding of an ignition coil is controlled in its conduction and cut-off by means of a transistor circuit, various auxiliary circuits to be disposed for a desired performance in accordance with the purpose of use and the rate of this circuit, and an ignition circuit for the internal combustion engine in accordance with the present invention, and more particularly to a method for preventing premature ignition in an ignition device for the internal combustion engine comprising a transistor circuit for controlling in conduction and cut-off of a primary short-circuit current in the whole circuit and a trigger circuit for controlling the trigger in said transistor

Abstract: This invention provides an improved magneto system which is reliable and stable irrespective of environmental conditions, wear and the like, and has no contacts, breakers or other moving parts in addition to the rotor itself. The conduction in the magneto winding means is initiated and terminated by a solid state device and preferably a solid state threshold device which is responsive to impulses of electrical energy to change its state between one of conduction and nonconduction whereby magneto operation can be controlled by relatively short duration trigger impulses. The trigger impulses may automatically produce a spark advance for increased magneto speeds.