Delphi Technologies, Inc.

Gm Global Technolgoy Operations, Inc.

Delphi Technologies IP Limited

Tillasthanam V Sriram

Jeffrey Alan Ely

Ronald John Krefta

Robert D Maple

Alexandre M Reis

Justin B Lybbert

Aurelien T Mozipo

James W Ananias

Hua Zhou

Steven Robert Mc Mullen

Alexandre M S Reis

Alejandro Olivares Perl

A control methodology for a two-stage PWM DC-DC conversion system, with transformer-isolation, in which the converter circuit input voltage is compared to a set voltage calibrated as a function of the desired output voltage and the maximum voltage conversion ratio provided by the second-stage converter. When the input voltage is above the set voltage, the second-stage converter is controlled to provide both output voltage regulation during normal operation and output current limiting during over-current conditions. However, when the input voltage is below the set voltage, the first-stage converter is controlled to provide output voltage regulation with minor output current limiting, and the second-stage converter is controlled to provide extended output current limiting independent of the input voltage.

Voltage and current regulation method for a two-stage DC-DC converter circuit

A method is disclosed for starting a generator () from an internal combustion engine () to allow the generator () to charge a battery (). The generator () includes a field bridge (), having first () and second () switches, and a multiphase inverter (), having upper () and lower () halves of switches. The method includes the step of providing a voltage from the battery () to the internal combustion engine (). The voltage is used to crank the internal combustion engine (). The first () and second () switches are closed to conduct and maximize the field current in the generator (). The method includes the step of identifying when the internal combustion engine () is transitioning from a cranking state to an idling state. The method then switches the first () and second () switches off to decrease the field current to zero. The method also turns the lower half of the switches () of the multiphase inverter on to quicken the decrease of the field current in the generator () to zero. This further reduces the amount of power consumed by the generator () to allow the internal combustion engine () to reach its idling state.

Method for minimizing generator load on internal combustion engine

An improved series-pass over-voltage protection circuit for a motor vehicle electrical system includes first and second parallel connected power paths that respectively provide low current capability with low quiescent current drain, and high current capability with low on-resistance. The first power path, embodied by a P-channel MOSFET, supplies pass-through battery current to quiescent loads such as an engine control module during periods of vehicle inactivity. The second power path, embodied by at least one N-channel MOSFET, is activated by a gate voltage power supply during periods of vehicle activity. The second power path is configured to limit the circuit output voltage to a higher value than the first power path, so that the over-voltage protection during periods of vehicle activity is accomplished by the second power path.

Series pass over-voltage protection circuit for a motor vehicle electrical system

Method and system for controlling a synchronous machine including a polyphase stator are provided. The machine may be used in a piece of equipment respectively as a generator and as a motor for starting an engine in the piece of equipment. The method allows to sense rotor position of the machine using a sensor assembly configured to supply a respective stream of pulses indicative of rotor position relative to each phase of the machine. The method further allows to process each stream of pulses from the sensor assembly to generate a first set of inverter control signals. The first set of inverter control signals is applied to an inverter circuit coupled to energize the phases of the stator to start the machine. The first set of control signals is configured to provide a first cycle-conduction angle relative to the zero-crossings of the respective phase EMF voltages of the machine to produce a sufficiently high level of torque during start of the machine. Upon the rotor reaching a predefined rotor speed value, each stream of pulses from the sensor assembly is processed to generate a second set of inverter control signals. The second set of inverter control signals is applied to the inverter circuit to energize the phases of the stator. The second set of control signals is configured to provide a second cycle-conduction angle relative to the zero-crossings of the respective phase EMF voltages of the machine to enable a sufficiently high rotor speed and thus facilitate the occurrence of a successful cranking event for the engine of the piece of equipment.

Method and system for controlling a synchronous machine using a changeable cycle-conduction angle

Method and system for bi-directionally controlling power flow between two separate direct current power sources in a multi-stage power converter system are provided. The method allows providing at least first and second power converter stages coupled in parallel circuit to one another. The method further allows providing a first switching controller coupled to selectively actuate a pair of switching devices in the first power converter stage, and a second switching controller coupled to selectively actuate a pair of switching devices in the second power converter stage. One of the first and second switching controllers is selected as a master controller, and the other one of the first and second switching controllers is selected as a slave controller. An average voltage measurement is determined at a respective node of each the power converter stages. A compensating signal is generated based on the difference of the average voltage measurements at the respective nodes of each of the power converter stages. The compensating signal is applied to the slave switching controller so that the pair of power switching devices coupled to that slave switching controller is selectively actuated to have a respective on and off duty cycle. The duty cycle imparted by the slave controller is adjustable in response to the compensating signal relative to the duty cycle imparted by the master controller to the pair of power switching devices coupled thereto in order to avoid current imbalance between the power converter stages.

Bi-directional DC/DC converter and control method therefor

A MOSFET control circuit for use in generators with dual windings. The MOSFET switch consists of two or more MOSFETs connected between the upper and lower windings of a three-phase generator to permit the windings to operate in series or in parallel. The gate of one of the MOSFETs is controlled by a gate drive circuit that turns the MOSFET ON when the windings are to operate in series. The MOSFET is OFF when the windings are to operate in parallel.

Mosfet control circuit for dual winding alternator

A sensorless method and apparatus for providing commutation timing signals for a brushless permanent magnet motor extracts the third harmonic back-emf of a three-phase stator winding and independently cyclically integrates the positive and negative half-cycles thereof and compares the results to a reference level associated with a desired commutation angle.

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Carmel, IN, United States of America

Tillasthanam V Sriram