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.

A motor power supply device includes a first power supply, a motor driven by a power supplied from the first power supply, a first power supply line, a first power supply side semiconductor switch, a first output side semiconductor switch, a first power supply side voltage detection unit disposed on a first power supply side with respect to the first power supply side semiconductor switch on the first power supply line and configured to detect a voltage of the first power supply line, and a control unit configured to execute control to determine a state of power supply from the first power supply to the first power supply side semiconductor switch based on a measured value obtained by the first power supply side voltage detection unit.

Described is a hybrid permanent magnet and wire wound starter generator system. The system includes a polyphase stator that converts a rotating magnetic field to electrical energy. The system also includes a rotor including a plurality of permanent magnets and a wound rotor section. The plurality of permanent magnets and the wound rotor section each generate a portion of the rotating magnetic field. Further, the system includes a controller that controls a polarity of the wound rotor section by transitioning the wound rotor section between a magnetic flux enhancement mode and a magnetic flux weakening mode.

Described is a system that includes a polyphase generator and a polyphase bridge rectifier electrically coupled to an output of the polyphase generator. The polyphase bridge rectifier may output a positive rectified ripple signal and a negative rectified ripple signal, and the positive rectified ripple signal and the negative rectified ripple signal may be summed to produce a total ripple signal. Further, the system may include a generator regulation feedback control loop that regulates the output of the polyphase generator with a field control signal. In an embodiment, the field control signal is based on summing the total ripple signal and a reference voltage.

An apparatus includes a device comprising a semiconductor junction configured to generate a reference voltage, a voltage divider circuit, a comparator circuit, and a first output circuit. The voltage divider circuit may be configured to generate a first predetermined threshold voltage in response to the reference voltage. The comparator circuit may be configured to generate a first intermediate signal in response to a comparison of the first predetermined threshold voltage and an input signal. The first output circuit may be configured to generate a first output signal in response to the first intermediate signal.

In an embodiment a method includes: sensing a first signal indicative of magnetization of a winding in a dynamoelectric machine; applying the first signal to a window comparator having a comparator window between upper and lower thresholds and generating window exit signals indicative of the first signal exiting the comparator window of the window comparator; generating a slowed-down replica signal of the first signal; updating the comparator window of the window comparator as a function of the slowed-down replica signal; and issuing a wake-up signal towards a control device of the dynamoelectric machine as a result of one of the window exit signals indicating the first signal exiting the comparator window of the window comparator for a time duration in excess of a duration threshold.

To provide a generator control device that, even when communication with an external control device is interrupted, evaluates independently, and can increase an amount of power generated so that a drop in DC voltage can be restricted preemptively, while restricting a fluctuation of rotational speed. A generator control device determines that a voltage drop prediction time control is executed when it is predicted that a drop of the DC voltage will be large; generates a rectangular pulse wave such that a duty ratio increases gradually during the excitation time when determining that the excitation control rotational speed condition was fulfilled, and the voltage drop prediction time control is executed; and changes the duty ratio so that the detected value of the DC voltage nears the increased target voltage when determining that the excitation control rotational speed condition was not fulfilled, and the voltage drop prediction time control is executed.

Systems and methods for providing electric energy to an electrically heated catalyst are described. In one example, the electrically heated catalyst may be a three phase device with heating elements that are arranged in a delta configuration. In other examples, the electrically heated catalyst may include a single heating element.

An apparatus includes a device comprising a semiconductor junction configured to generate a reference voltage, a voltage divider circuit, a comparator circuit, and a first output circuit. The voltage divider circuit may be configured to generate a first predetermined threshold voltage in response to the reference voltage. The comparator circuit may be configured to generate a first intermediate signal in response to a comparison of the first predetermined threshold voltage and an input signal. The first output circuit may be configured to generate a first output signal in response to the first intermediate signal.

A supercritical CO2 turbo-generator system is disclosed. The turbo-generator system comprises: a plurality of turbine generator units (200A-200C), a direct current bus (410), a plurality of active rectifiers (290A-290C), and a voltage controller (280). Each of plurality of turbine generator units comprises: a turbine (312) with a supercritical CO2 input and a supercritical CO2 output, a generator (326) with an electrical input and power output, a shaft (314) connecting the turbine and generator, and a speed sensor (327) for determining a speed of the associated shaft. The plurality of turbine generator units are connected in the form of a cascading series with the input of a first turbine generator unit (200A) connected to a source of heated supercritical CO2. The input of a second turbine generator unit (200B) is connected to the output of the first turbine generator unit. The input of a third turbine generator unit (200C) is connected to the output of the second turbine generator unit. The voltage controller (280) is configured to monitor the speed sensor (327) of each of the plurality of turbine generator units and vary the load on each generator (230A-230C) to control shaft (314) speed. Each of the plurality of active rectifiers (290A-290C) then converts the power output of a generator (230A-230C) to direct current, and the power from the plurality of active rectifiers then combined by the direct current bus.