System for controlling a direct-current-to-direct-current converter to provide electrical energy to a vehicle implement

Patent metadata

Field	Value
Publication number	US-11070136-B2
Application number	US-201916669691-A
Country	US
Kind code	B2
Filing date	Oct 31, 2019
Priority date	Oct 31, 2019
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

Each one of the secondary converters has a corresponding transformer having a primary winding associated with a primary alternating current (AC) signal and a secondary winding associated with a secondary alternating current (AC) signal. A secondary controller provides secondary control signals to the secondary semiconductor switches of the secondary converters with one or more time-synchronized, target phase offsets with respect to an observed phase of the alternating current signal (e.g., primary alternating current signal or the secondary alternating current signal) to provide the target phase offset (or targeted phase offsets) commensurate with or sufficient to support a required electrical energy transfer from the primary controller to the corresponding secondary controller (or secondary controllers).

First claim

The following is claimed:

1. A system for controlling a direct-current-to-direct-current converter comprising:
a primary converter, the primary converter having primary semiconductor switches;
a primary controller providing control signals to the primary semiconductor switches;
a plurality of secondary converters comprising a first secondary converter and a second secondary converter, the first and second secondary converters coupled in parallel to the primary converter via a set of conductors, each of the first and second secondary converters having secondary semiconductor switches;
a plurality of transformers, each one of the first and second secondary converters associated with a corresponding one of the transformers, each of the transformers comprising a primary winding associated with a primary alternating current signal of the primary converter and a secondary winding associated with a secondary alternating current signal of a corresponding one of the first and second secondary converters;
a plurality of primary sensors, at least one of the primary sensors associated with a corresponding one of the transformers, each of the primary sensors configured for measuring or detecting a respective observed reference phase of an output phase of the corresponding primary alternating current signal transmitted to one of the first and second secondary converters; and
a plurality of secondary controllers comprising a first secondary controller and a second secondary controller, the first and second secondary controllers providing secondary control signals to the respective secondary semiconductor switches of the first and second secondary converters with time-synchronized, target phase offsets with respect to the observed reference phase of the primary alternating current signals, to provide the target phase offsets commensurate with or sufficient to support a required electrical energy transfer from the primary controller to at least one of the first and second secondary controllers;
the first secondary controller providing first secondary control signals for a first phase, a second phase and a third phase of first secondary semiconductor switches of the first secondary converter with time-synchronized, target phase offsets with respect to the respective observed reference phase of the first phase, the second phase or the third phase of the primary alternating current signal; and
the second secondary controller providing second secondary control signals for a first phase, a second phase and a third phase of second secondary semiconductor switches of the second secondary converter with time-synchronized, target phase offsets with respect to the respective observed reference phase of the first phase, the second phase or the third phase of the primary alternating current signal,
wherein each of the primary sensors comprises a phase detector that is associated with the primary winding or a primary terminal of the corresponding transformer for measuring or detecting the respective observed reference phase of the corresponding primary alternating current signal transmitted to a respective one of the first and second secondary converters.

2. The system according to claim 1 wherein the corresponding primary alternating current signal comprises a phase of the corresponding primary alternating current signal selected from the phases consisting of the first phase, the second phase and the third phase of the primary converter.

3. The system according to claim 1 wherein each conductor within the set has a particular transmission line length arising from a separation, on a vehicle-implement configuration, between the primary converter and respective ones of the first and second secondary converters, the particular transmission line length associated with a respective inductance, wherein the first secondary controller measures the observed reference phase and wherein:
the second secondary controller is adapted to store, in a data storage device, a phase delay characterization data related to the particular phase delay associated with the second secondary controller and its particular transmission line length;
an electronic data processor of the second secondary controller is configured to adjust the observed reference phase provided by the first secondary controller.

4. The system according to claim 3 wherein each of the first and second secondary converters has a different transverse position along a transverse member of an implement which provides a different transmission line length between a primary AC output node of the primary converter, or a junction node, and corresponding AC input terminals of each of the first and second secondary converters.

5. The system according to claim 1 wherein each of the first and second secondary converters has a different secondary inductance or different phase delay, each of the first and second secondary controllers providing a corresponding different target phase offset in the secondary control signals to each of the first and second secondary converters to preserve a target phase offset based on the observed reference phase of one of the primary alternating current signal or of the secondary alternating current signal.

6. The system according to claim 1 wherein the primary converter comprises a three-phase converter and wherein each of the first and second secondary converters comprises a three-phase converter.

7. The system according to claim 1 wherein a vehicle-implement configuration of the direct-current-to-direct-current converter comprises the primary converter mounted on a vehicle with propulsion unit and wherein each of the first and second secondary converters is mounted on an implement that is towed or carried by the vehicle.

8. The system according to claim 7 wherein the implement comprises row units mounted on a traverse member that is generally orthogonal to a longitudinal axis of the implement.

9. The system according to claim 8 wherein each row unit has an electric motor that is coupled to a corresponding one of the first and second secondary converters to dispense seed or crop inputs.

10. The system according to claim 9 wherein for each row unit the electric motor is coupled to the corresponding one of the first and second secondary converters via respective ones of a plurality of implement inverters to control a torque or velocity of the electric motor.

11. A system for controlling a direct-current-to-direct-current converter comprising:
a primary converter, the primary converter having primary semiconductor switches;
a primary controller providing control signals to the primary semiconductor switches;
a plurality of secondary converters comprising a first secondary converter and a second secondary converter, the first and second secondary converters coupled in parallel to the primary converter via a set of conductors, each of the first and second secondary converters having secondary semiconductor switches;
a plurality of transformers, each one of the first and second secondary converters associated with a corresponding one of the transformers, each of the transformers comprising a primary winding associated with a primary alternating current signal of the primary converter and a secondary winding associated with a secondary alternating current signal of a corresponding one of the first and second secondary converters;
a plurality of secondary sensors, at least one of the secondary sensors associated with a corresponding one of the transformers, each of the secondary sensors configured for measuring or detecting a respective observed reference phase of an output phase of the corresponding secondary alternating current signal transmitted to one of the

Assignees

• Deere & Co

Inventors

• Dutta Sumit
• Wu Long
• Gupta Shuvam
• Loken David M
• Linn Eric R

Classifications

• H02M3/33576 Primary

  having at least one active switching element at the secondary side of an isolation transformer · CPC title

• A01C19/00

  Arrangements for driving working parts of fertilisers or seeders {(A01C17/005 takes precedence)} · CPC title

• A01C7/00

  Sowing · CPC title

• H02M1/009

  having two or more independently controlled outputs (for DC-DC converter with intermediate AC H02M3/33561) · CPC title

• A01C7/08

  Broadcast seeders; Seeders depositing seeds in rows · CPC title