Abstract: A method of estimating rotor speed of a generator 106 having a rotor 110 and a stator 112 is provided. The method may provide a source current to the stator 112, determine a relative rotor speed based on a sensor signal provided by a rotor speed sensor 130, determine a relative rotor position corresponding to the relative rotor speed, determine an absolute rotor position based on the sensor signal and phase currents, and calibrate the sensor signal based on an offset between the relative rotor position and the absolute rotor position.

Abstract: A control system for a switched reluctance (SR) machine is provided. The control system may include a converter circuit that is operatively coupled to the SR machine, and a controller in communication with the converter circuit. The controller may be configured to execute two or more processes in parallel, wherein the processes include generating a torque command based on one or more of bus voltage, machine current, rotor speed and rotor position, determining a first set of current control parameters based on the torque command and the rotor speed, determining a second set of current control parameters based on one or more of the torque command, the rotor speed and the rotor position, selecting one of the first and second sets of current control parameters based on the rotor speed, and operating the gates according to the selected set of current control parameters.

Abstract: A protection circuit includes a first switch, a second switch and a third switch. The first switch, the second switch and the third switch are configured to generate lock signals indicative of an electrical voltage transition on the respective phases of a multi-phase power signal. A control circuit is configured to prevent the first switch from changing state if the second switch or third switch is changing state.

Abstract: A method of controlling a motor is provided. The method may determine a speed of the motor, and engage a soft chopping routine on a first switch and a second switch of each phase if the motor speed is relatively low. The first switch may be driven by a first pulse width modulated PWM signal and the second switch being driven by a second PWM signal. The first and second PWM signals may be alternatingly configured such that at least one of the first switch and the second switch is closed at any point during the distributed soft chopping routine and both the first switch and the second switch are never simultaneously open.

Abstract: An apparatus includes a sawtooth generator configured to generate a sawtooth voltage, where the sawtooth generator is configured to repeatedly reset the sawtooth voltage using a clock signal. The apparatus also includes a pulse width modulation (PWM) generator configured to generate a PWM signal using the sawtooth voltage, the PWM signal comprising multiple PWM pulses, where an output voltage is based on the PWM signal. The apparatus further includes a transient detector configured to detect a transient associated with the output voltage and to cause the sawtooth generator to asynchronously reset the sawtooth voltage in response to the detected transient. The resetting of the sawtooth voltage may cause the sawtooth generator to lengthen one or more of the PWM pulses in the PWM signal and/or generate one or more additional PWM pulses in the PWM signal. This can help to increase a duty cycle of the PWM signal.

Abstract: A method of estimating rotor speed of a generator 106 having a rotor 110 and a stator 112 is provided. The method may provide a source current to the stator 112, determine a relative rotor speed based on a sensor signal provided by a rotor speed sensor 130, determine a relative rotor position corresponding to the relative rotor speed, determine an absolute rotor position based on the sensor signal and phase currents, and calibrate the sensor signal based on an offset between the relative rotor position and the absolute rotor position.

Abstract: A method of controlling a generator (110) of an electric drive (104) associated with an engine (102) is provided. The method may determine an operational state of the electric drive (104) based on a speed of the engine (102), and selectively engage one of a map-lookup control scheme (150) and a fixed-theta off control scheme (152) for operating the generator (110) based on the operational state of the electric drive (104).

Abstract: A system and method is disclosed for providing multi-point calibration of an adaptive voltage scaling (AVS) system. A plurality of Reference Calibration Codes (RCCs) within a multi-point calibration table is provided. Each code is associated with one of the clock frequencies of the adaptive voltage scaling (AVS) system. The present invention provides multi-point calibration by calibrating a Reference Calibration Code (RCC) for each operating point (clock frequency) of the adaptive voltage scaling (AVS) system.

Abstract: Systems, methods, and computer program products are provided for assisting in understanding and tracking the potential risks and rewards of investment projects so that they can be efficiently evaluated for approval and tracked for progress. For example, in one embodiment, an investment system causes display of input requests and receives responses to the input requests from conception of the investment project to completion of the investment project.

Abstract: A method includes generating a regulated voltage for a powered component and modifying the regulated voltage with an adaptive voltage scaling (AVS) control loop. The method also includes further modifying the regulated voltage using at least one additional control loop. The AVS control loop is isolated from the at least one additional control loop. Modifying the regulated voltage with the AVS control loop could include storing an AVS digital value and converting the AVS digital value into an analog signal. Modifying the regulated voltage with the AVS control loop could also include modifying a control signal for a voltage regulator using the analog signal, where the voltage regulator generates the regulated voltage. Modifying the regulated voltage with the AVS control loop could further include buffering the analog signal and outputting the buffered analog signal as an isolated AVS signal over the AVS control loop.

Abstract: A system and method is disclosed for providing multi-point calibration of an adaptive voltage scaling (AVS) system. A plurality of Reference Calibration Codes (RCCs) within a multi-point calibration table is provided. Each code is associated with one of the clock frequencies of the adaptive voltage scaling (AVS) system. The present invention provides multi-point calibration by calibrating a Reference Calibration Code (RCC) for each operating point (clock frequency) of the adaptive voltage scaling (AVS) system.

Abstract: A method and apparatus is arranged to produce high precision output voltage matching in a multiple output power converter. A two-output voltage converter includes a positive and a negative voltage output that are approximately equal in magnitude. The power converter includes inductors, transfer capacitance circuitry, and a controlled switching circuit. In one operating mode, the switching circuit is closed, the inductors are charged, and energy from the input signal is stored in the transfer capacitance circuitry. In a second operating mode, the switching circuit is opened, and the stored energy is transferred to the output loads. The transfer capacitance circuitry is arranged to provide improved matching in the output voltages. The two-output power converter topology may be extended to provide multiple outputs.