In one embodiment, an inverter system is disclosed. The system includes a plurality of inverter circuits, each inverter circuit configured to provide a respective alternating current (AC) signal to an output. The system further includes a plurality of rectifier circuits configured to supply respective direct current (DC) signals to the plurality of inverter circuits, and an alternator comprising inductively-coupled windings and configured to provide respective AC power to the plurality of rectifier circuits. The plurality of rectifier circuits are synchronous rectifier circuits configured to drive the alternator in reverse to transfer power to another one of the plurality of rectifier circuits via the respective windings.

An isolated bus inverter system including inverter circuits and a controller. The inverter circuits include a switching array to provide a polyphase alternating current (AC) signal to an output. Each of the inverter circuits includes an energy source isolated from the other inverter circuits of the inverter circuits or a reference isolated from the other inverter circuits of the inverter circuits. The controller is configured to generate timing signals for the inverter circuits to generate the AC signals for the output based on DC signals received from one or more rectifier circuits.

An alternating current generator driven by an engine and capable of obtaining power from an output terminal connected to armature windings according to a plurality of different power supply specifications includes a calculation processing device configured to calculate a remaining capacity from a voltage value between terminals of the output terminal and a current value of a current flowing to the output terminal, and display the remaining capacity. The calculation processing device performs: calculating the remaining capacity as an apparent power value; calculating usage power as an active power value to calculate remaining power by subtracting the usage power from a rated output of the engine; and comparing the remaining capacity with the remaining power, and outputting a smaller value as a remaining capacity display value indicated by the active power value.

A power generating apparatus and vector control method thereof are provided. The apparatus includes a rotor with plurality of symmetric phase windings, a stator with a single phase winding, sensors and an excitation control device. Current sensors on the stator side and on the rotor side are configured to measure the amplitudes of the load current and the phase current of the rotor respectively. A position sensor is configured to measure the angle of the rotor. The excitation control device is configured to regulate the engine speed responsive to load power. The excitation control device also generates a modulating signal in accordance with the target voltage vector of the rotor and the slip angle and regulates the excitation current in the phase windings of the stator with the modulating signal.

A field circuit includes a positive pole side switching element which is for controlling field current that flows in a field winding and a negative pole side switching element which is for interrupting the field current; a field circuit control section includes a field high-speed interruption determination block and a field current interruption speed control block; and at the time of interrupting the field current at a high speed, the field current is interrupted immediately by turning OFF both switching elements of the positive pole side and the negative pole side and interruption speed of the field current is controlled by intermittently driving the negative pole side switching element.

The invention relates to a regulation system for a control circuit of a rotary electrical machine with a rotor provided with a winding (208), the control circuit being provided with a transistor (205). The regulation system (1) is designed to comprise a signal converter (201) in order to convert an amplitude width modulation signal (PWM) into a reference signal (SREF) with cosinusoidal form parts, and a comparator (202) in order to establish the difference between the reference signal (SREF) and a transistor current (IT), in order to deduce an error signal (ERR) from which a control signal (COM) applied to a gate of the transistor is determined.

Unique systems, methods, techniques and apparatuses of a rotating DC power supply are disclosed. One exemplary embodiment includes a first and second DC bus rail, a first and second leg, and a discharge resistor. The first leg includes a first semiconductor device and a second semiconductor device coupled in series at a first midpoint connection, the first semiconductor device being coupled to a first point on the first DC bus rail and the first midpoint connection being coupled to a field winding. The second leg includes a third semiconductor device and a fourth semiconductor device coupled in series at a second midpoint connection, the third semiconductor device being coupled to a second point on the first DC bus rail and the second midpoint connection being coupled to the field winding. The discharge resistor is operatively coupled to the first DC bus rail between the first point and the second point.

A regulator control circuit includes a regulator configured to provide an output voltage by regulation using one of an input voltage and a dropped input voltage, to a load; and a heat dissipation circuit configured to sense a change in the input voltage, and provide the dropped input voltage to the regulator when the input voltage is sensed to be equal to or higher than a preset level.

An independent speed variable frequency alternating current (AC) generator apparatus may include a rotor and a stator, the rotor configured to rotate relative to the stator. The apparatus may further include a magnetic field source attached to the rotor and configured to generate a first rotating magnetic field upon rotation of the rotor, where a rotational frequency of the first rotating magnetic field is dependent on a rotational frequency of the rotor. The apparatus may also include a main rotor winding attached to the rotor and configured to generate a second rotating magnetic field upon the rotation of the rotor, where a rotational frequency of the second rotating magnetic field is independent of the rotational frequency of the rotor.

Power generation control devices (4) of respective power generators (1) transmit conduction rates of field coils (101) of the respective power generators (1) to an external control device (5), while the external control device (5) obtains an average value of the conduction rates, obtains a field duty limiting command value for limiting the conduction rate of the field coil (101) determined by the power generation control device (4) based on the average value, and transmits the field duty limiting command value to the power generation control device (4). With this operation, the power generation control device (4) limits power generation amounts of the respective power generators (1) based on the command value, to thereby equalize the power generation amounts of the respective power generators (1).