Deere + Company

Tianjun Fu

Long Wu

Robert B Shaw

Chris J Tremel

Richard E Wainwright

Yuheng Wu

Brij N Singh

Kent D Wanner

David Michael Loken

Danielle Li

Zachary J Wehri

Jason Dickherber

Zimin W Vilar

Eric Vilar

Neal D Clements

Lav Thyagarajan

Dustin E Oelmann

Srujan Kusumba

Rachit Agarwal

Jacob R DeCock

Dustin W Oelmann

Vilar W Zimin

An electronic controller is configured to provide control signals to the control terminals of the semiconductor switches of the primary converter and the secondary converter based on a commanded current or target output current; the electronic controller is configured to adjust the phase angle(s), between a respective pairs of semiconductor switches of the primary converter and second converter based on a deadtime compensation module responsive to a current error or current difference between the target output current and the observed output current. A low-pass filter facilitates estimation of the current error for compensation in the commanded current.

Dual active bridge converter with deadtime compensation reducing heat for varying loads

In an example embodiment, a system includes an inverter configured to operate in at least one of a charging mode or a drive mode, a cascaded direct current (DC)-DC converter, the DC-DC converter including a first portion of the inverter and at least one controller configured to selectively couple the first portion of the inverter to a first portion of the cascaded DC-DC converter during the charging mode, and selectively couple the inverter to a second portion of the cascaded DC-DC converter during the drive mode.

Dual-purpose drive and charger systems and methods thereof

An electronic controller is configured to adjust the duty cycle, between a respective pairs of semiconductor switches of the primary converter of a direct-current-to-direct-current converter based on reducing or minimizing one or more of the first estimated line-to-line DC offset voltage, the second estimated line-to-line DC offset voltage, and the third estimated line-to-line DC offset voltage. Further, the electronic controller is configured determines duty cycle adjustments based on oversampling (e.g., enhanced data processing with interpolation) of smoothed or integrated representation of the first estimated line-to-line DC offset voltage, the second estimated line-to-line DC offset voltage, and the third estimated line-to-line DC offset voltage.

Direct-current-to-direct-current converter with transformer thermal management

In an example embodiment, a system includes a plurality of inverters configured to operate in at least one of a charging mode or a drive mode, a plurality of motors and at least one controller configured to selectively couple the plurality of inverters to the plurality of motors during a drive mode, and selectively couple at least one of the inverters to an alternating current (AC) source during the charging mode and decouple the at least one of the inverters from the plurality of motors during the charging mode.

A system and method for controlling a dual active bridge based DC/DC converter. A controller implements a startup control scheme and DC bus pre-charge routine to prevent damage to the converter upon startup. During startup of the converter, the startup control process can be used to prevent excessive phase-shift and the DC bus pre-charge routine adjusts the pulse width modulated duty cycle by increasing the dead time between signals, resulting in a decreased DC bus capacitor.

Startup process for a dual active bridge converter to prevent over-voltage failure and thermal run-away

A first inverter has a set of first output phases coupled to a grid voltage source. A second inverter has a set of second output phases coupled to the grid voltage source. A phase measurement device is adapted to measure at least one reference phase of the grid voltage source at a reference phase point. An electronic data processor is configured to: determine an observed phase difference between the reference phase point and an observed position sample of a pulse-width-modulation carrier signal of the first inverter, the second inverter, or each parallel-coupled inverter; determine a target phase difference between the reference phase point and target position sample of the pulse-width-modulation carrier signal; determine a frequency adjustment to the pulse-width-modulation carrier signal of the first inverter, the second inverter, or all parallel-coupled inverters, based on a difference between the observed phase difference and the target phase difference.

System and method for frequency adjustment of parallel inverters coupled to a grid power source

In accordance with one embodiment, a system and method of controlling a direct current to direct current converter that comprises a primary full bridge coupled to a secondary full bridge via a transformer. After the start-up time period, an electronic data processor controls the converter to operate efficiently in a first control mode, a second control mode, or a third control mode, wherein the first control mode comprises a phase shift mode, the second control mode comprises a triangular waveform control mode and wherein the third control mode comprises a trapezoidal waveform control mode. The electronic data processor determines a maximum target power range and a transition power level threshold for each one of the control modes.

Method and system for controlling switching of a direct current to direct current converter

In accordance with one embodiment, an observed power transfer is estimated based on input and output voltage measurements associated with an observed power transfer from the primary converter to the secondary converter. An electronic controller or electronic data processor determines a ratio or percentage between the observed power transfer and maximum power transfer. A load curve is selected based on the determined ratio or percentage. The modulation frequency is adjusted or maintained for of the primary converter and the secondary converter consistent with an operation point on the selected load curve, where the operation point minimizes the power loss, power difference, or thermal energy dissipated from the converter.

Method and system for controlling a direct current to direct current converter

A controller including a memory having computer-readable instructions stored therein; and a processor configured to execute the computer-readable instructions to: estimate a synthesized grid voltage vector angle at a terminal of an alternating current (AC) grid based on at least an adjusted angle, to generate Pulse Width Modulation (PWM) signals to control power switches of the AFE inverter based on at least the synthesized grid voltage vector angle, and to control the AFE inverter to exchange power between the AC grid and a load based on the PWM signals.

Voltage sensor-less position detection in an active front end

A controller may include a memory having computer-readable instructions stored therein; and a processor configured to execute the computer-readable instructions to generate Pulse Width Modulation (PWM) signals to control power switches of an Active Front End (AFE) inverter based on at least a synthesized grid voltage vector angle at a terminal of an alternating current (AC) grid without using physical voltage sensors at the terminal of the AC grid, and control the AFE inverter to supply power to a load based on the PWM signals.

In one example embodiment, a method includes determining a first adjustment value for a slip frequency of a rotor in an induction motor, determining a second adjustment value for an inductance of the induction motor and tuning the slip frequency of the rotor and the inductance of the induction motor based on the first adjustment value and the second adjustment value, respectively.

Methods of auto tuning machine parameters and systems thereof

A temperature estimation module estimates each junction temperature of a corresponding semiconductor device, among a plurality of semiconductor devices, for each phase of an inverter. The temperature estimation module or the data processing system determines a hottest device with a highest junction temperature among the semiconductor devices. A thermal adjustment module or data processing system determines if the highest junction temperature parameter is less than maximum junction temperature parameter for the respective semiconductor device or deciding whether or not to adjust a duty cycle of the semiconductor devices.

Method and inverter with thermal management for controlling an electric machine

In one example embodiment, a device for controlling an alternating current (AC) machine is disclosed. The device includes a processor configured to determine a plurality of instantaneous voltages corresponding to a plurality of phase voltages of an inverter, the inverter driving the AC machine. The processor is further configured to determine an actual line-to-line voltage of the inverter based on the plurality of instantaneous voltages. The processor is further configured to determine a terminal voltage feedback for controlling the AC machine, based on the determined actual line-to-line voltage and a terminal voltage threshold.

Method and apparatus for controlling an alternating current machine

Embodiments of the present invention provide a device and method for generating initial operating points for controlling an interior permanent magnet (IPM) machine. The method includes loading an inductance lookup table, first calculating a maximum torque per Ampere (MTPA) trajectory for a first threshold speed based on machine parameters of the IPM machine, second calculating a truncated voltage limit ellipse with monotonically increasing torque for a first speed based on the machine parameters, if the first speed is higher than the first threshold speed, determining an operating trajectory at the first speed based on at least one of the calculated MTPA trajectory and the calculated truncated voltage limit ellipse, and generating an I,Imap that maps an Ivalue and an Ivalue to each torque command of a plurality of torque commands for the first speed based on the determined operating trajectory.

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Fargo, ND, United States of America

Tianjun Fu