An inverter type engine generator includes an alternator operable as a motor for starting an engine; a converter composed of a three-phase rectifying bridge circuit, converting three-phase alternating current output from the alternator into direct current, and operatable as a motor driver for driving the alternator when power is supplied from a power source; and a processor and a memory. The upper and lower three sets of elements of the three-phase rectifying bridge circuit of the converter are configured such that upper elements are configured from duty-controllable switching elements and thyristors connected in parallel therewith, and lower elements are configured from duty-controllable switching elements having diodes. The processor and the memory perform turning off the lower elements and controlling the duty of the thyristors while turning off the upper elements so that an output voltage of the three-phase rectifying bridge circuit is reduced, when a detected terminal voltage of the converter exceeds the target voltage.

A control method and system for driving of a motor and a control method of driving of an air compressor of a fuel cell system using the same include calculating an electrical rotation frequency of a motor, calculating a driving torque frequency of the motor based on the calculated electrical rotation frequency of the motor, and controlling torque of the motor to be repeatedly turned on/off at the calculated driving torque frequency.

Controlling a DC-AC inverter of an electric machine, where the electric machine comprises a resonant main exciter having rotary transformer. A voltage level of DC power received at a DC-AC inverter is monitored and the frequency of AC power generated by the DC-AC inverter and supplied to the rotary transformer is controlled based at least in part on the voltage level of the DC power.

Systems and methods for voltage regulation of high voltage direct current systems are provided. In certain embodiments, a system includes a generator that generates alternating current (AC) voltage. The system further includes a power converter that converts the AC voltage into regulated direct current (DC) voltage. Also, the system includes a voltage regulator. In additional embodiments, the voltage regulator includes an AC voltage regulator that regulates the AC voltage generated by the generator. Also, the voltage regulator includes a DC voltage regulator that regulates the DC voltage produced by the power converter. Moreover, the voltage regulator includes a regulator selector that selectively activates one of the AC voltage regulator and the DC voltage regulator based on a current from the power converter and at least one of a voltage of the generator and a voltage of the power converter.

A method of controlling a variable speed constant frequency (VSCF) power converter is provided. The method includes receiving a determination that a sensed AC current output has exceeded a predetermined limit. The AC current output is converted from a DC voltage and has a constant frequency. The DC voltage is converted from a variable frequency AC voltage. The variable frequency AC voltage is generated in response to a mechanical energy input having a varying parameter. The method further includes decreasing the DC voltage in response to a determination that the sensed AC current output has exceeded the predetermined limit.

A power conversion device, comprising: an energization device (END) applying a voltage to armature and field windings of a rotating electrical machine (REM) according to an energization signal (ENS), and having inverter and alternator power generation modes (I-PGM, A-PGM); a power-generation switching signal generator (PGSSG) generating a power-generation switching signal (GES) for switching the I-PGM, A-PGM according to switching of a first selection (FSS) switching the modes arbitrarily and a second selection (SSS) switching the modes base on a maximum output in the modes; a voltage command generator (VCG) generating an armature voltage command (AVC) and a field voltage command (FVC) based on a REM output command (REMC); an energization signal generator (ESG) generating the ENS corresponding to armature and field windings based on AVC, FVC, GES and DC voltage of END, wherein PGSSG generates the GES by switching FSS, SSS regarding a rotating electrical machine output command MOC value.

A power conversion device, comprising: an energization device (END) applying a voltage to armature and field windings of a rotating electrical machine (REM) according to an energization signal (ENS), and having inverter and alternator power generation modes (I-PGM, A-PGM); a power-generation switching signal generator (PGSSG) generating a power-generation switching signal (GES) for switching the I-PGM, A-PGM according to switching of a first selection (FSS) switching the modes arbitrarily and a second selection (SSS) switching the modes base on a maximum output in the modes; a voltage command generator (VCG) generating an armature voltage command (AVC) and a field voltage command (FVC) based on a REM output command (REMC); an energization signal generator (ESG) generating the ENS corresponding to armature and field windings based on AVC, FVC, GES and DC voltage of END, wherein PGSSG generates the GES by switching FSS, SSS regarding a rotating electrical machine output command MOC value.

An electronic device, in particular an alternator regulator, comprising a power stage to be connected to an inductive load, in particular to an alternator inductor, comprising at least one first pair of power transistors connected to a terminal of a DC bus, and a control circuit for said transistors, the transistors being disposed in parallel between said terminal of the DC bus and a first output to be connected to the load, at least one flyback diode connecting the opposite terminal of the DC bus to the first output, the control circuit being designed to generate a pulsed control signal for regulating the current in the load and for detecting a failure of one of the transistors, the control circuit being designed, during normal operation, to send the control signal to one of the transistors of the first pair, while maintaining the other transistor of said pair in an off-state.

The invention relates to a device and a method for reducing the number of analog inputs at a control device (16). It is proposed that at least two physical signals, which are different from each other, are transmitted at an analog input of the control device (16).

A generator system can include a dual stator generator comprising a first stator and a second stator, a first rectifier operatively connected to the first stator to receive AC from the first stator, a second rectifier operatively connected to the second stator to receive AC from the second stator, and a first DC output line and a second DC output line. The first rectifier and the second rectifier can be connected in parallel to the first DC output line and a second DC output line without an inter phase transformer (IPT) to output DC to the first DC output line and the second DC output line.