Zero crossing contactor and method of operating

Patent metadata

Field	Value
Publication number	US-11189449-B2
Application number	US-201916394347-A
Country	US
Kind code	B2
Filing date	Apr 25, 2019
Priority date	Apr 25, 2018
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

A contactor apparatus and method for operating the contactor apparatus can include a contactor assembly with a contactor coil operably coupled to a contactor switch. One or more sensors can be provided in the contactor assembly adapted to measure one or more aspects of the contactor assembly. Based upon the measured aspects, a controller can initiate operation of the contactor switch to effectively toggle the contactor switch at a zero-crossing point along an alternating current waveform.

First claim

What is claimed is:

1. A method of operating a contactor, the method comprising:
receiving, in a controller module, an electrical signal representative of an alternating current (AC) waveform of a power supply and of an electrical signal delay time;
receiving, in the controller module, a temperature value representative of the temperature of a contactor coil and of a coil temperature delay time;
receiving, in the controller module, a contactor coil operational characteristic representative of a contactor coil operational characteristic delay time;
determining, in the controller module, a contactor time delay for at least one of disconnecting or connecting the power supply by the contactor, the contactor time delay being a summation of a set of delay timings based on the electrical signal delay time, the coil temperature delay time, and the contactor coil operational characteristic delay time; and
initiating, by the controller module, the at least one of disconnecting or connecting of the power supply by the contactor at an initiation time prior to a zero-crossing voltage of the AC waveform, wherein the initiation time anticipates the zero-crossing voltage based upon the contactor time delay.

2. The method of claim 1 , wherein an effective disconnecting or connecting of the power supply coincides with the zero-crossing voltage of the AC waveform.

3. The method of claim 1 wherein the determining is further based on estimating the contactor time delay.

4. The method of claim 1 wherein the determining is further based on predicting the contactor time delay.

5. The method of claim 1 wherein the determining the contactor time delay is further based on the summation of the set of delay timings and an error correction value defined by a difference between an effective disconnecting or connecting of the power supply along the AC waveform and the zero-crossing voltage of the AC waveform of at least one previous contactor disconnection or connection.

6. The method of claim 5 wherein the error correction value is based upon a difference in a voltage measured at an effective disconnecting or connecting of the power supply and a zero value for the voltage.

7. The method of claim 6 wherein the error correction value is further based upon the voltage at the effective disconnecting or connecting, and the AC waveform of the power supply.

8. The method of claim 1 wherein the initiating further includes energizing a solenoid coil with a coil power supply to operably disconnect or connect the power supply.

9. The method of claim 8 wherein the initiating further includes closing a coil switch to provide the coil power supply to the solenoid coil.

10. A method of operating a contactor, the method comprising:
receiving, in a controller module, an alternating current (AC) waveform of a power supply;
receiving, in the controller module, a temperature of a contactor coil energizable to disconnect the power supply from an electrical load, the temperature representative of an electrical signal delay time;
receiving, in the controller module, a contactor coil energizing supply characteristic representative of a contactor coil energizing supply characteristic delay time;
determining, in the controller module, a total contactor time delay defined by a timing estimation to operably disconnect or connect the power supply and the electrical load, based on a coil temperature delay time and the contactor coil energizing supply characteristic delay time;
determining a contactor initiation time based on the total contactor time delay and the AC waveform of the power supply, such that an expiration of the total contactor time delay coincides with a zero-crossing voltage of the AC waveform; and
initiating, by the controller module, a toggling of the power supply by the contactor at the contactor initiation time.

11. The method of claim 10 wherein the initiating further includes energizing the contactor coil with the contactor coil energizing supply at the contactor initiation time.

12. The method of claim 10 , wherein an effective toggling of the power supply coincides with the zero-crossing voltage of the AC waveform.

13. The method of claim 10 wherein the determining the contactor time delay is further based on the temperature of the contactor coil, the contactor coil energizing supply characteristic, and an error correction value defined by a difference between an effective toggling of the power supply by the contactor along the AC waveform and the zero-crossing voltage of the AC waveform of at least one previous contactor disconnection or connection.

14. The method of claim 13 wherein the error correction value is based upon a difference in a voltage measured at an effective disconnecting or connecting of the power supply and a zero value for the voltage.

15. The method of claim 14 wherein the error correction value is further based upon the measured voltage at the effective toggling of the power supply by the contactor and AC waveform of the power supply.

16. A contactor assembly comprising:
a contactor switch selectably connecting an input with an output;
a contactor coil operably coupled to the contactor switch and configured to actuate the contactor switch;
a contactor coil temperature sensor configured to measure a temperature of the contactor coil;
a contactor coil operational characteristic sensor configured to measure an operational characteristic of the contactor coil;
an input alternating current (AC) waveform sensor configured to measure an AC waveform of a power supply from the input; and
a controller module configured to:
receive a first electrical signal from the input AC waveform sensor representative of the AC waveform and of an electrical signal delay time,
receive a second electrical signal from the contactor coil temperature sensor representative of the temperature of the contactor coil and of a coil temperature delay time,
receive a third electrical signal from the contactor coil operational characteristic sensor representative of an operational characteristic delay time of the contactor coil,
determine a contactor time delay as a summation of a set of delay timings based upon the first, second, and third electrical signals,
initiate at least one of a disconnecting or connecting of the input and the output by the contactor switch at an initiation time prior to a zero-crossing voltage of the AC waveform wherein the initiation time is based upon the contactor time delay.

17. The contactor assembly of claim 16 wherein the controller module is further configured to at least one of effectively disconnect or effectively connect the input and the output when the AC waveform has a zero voltage.

18. The contactor assembly of claim 17 further comprising an output voltage sensor configured to measure a voltage when the input is at least one of effectively disconnected or effectively connected from the output.

19. The contactor assembly of claim 18 wherein the controller module is configured to receive a fourth electrical signal from the output voltage sensor.

20. The contactor assembly of claim 19 wherein the controller module is further configured to determine the contactor time delay as the summation of the set of delay timings based upon the first, second, third, and fourth electrical signals.

Assignees

• Ge Aviat Systems Ltd

Inventors

• Payne Peter Roy
• Houghton John
• Bullock Robert Henry Keith Miles

Classifications

• H02H3/021

  concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order (disconnection at zero value in general H03K17/18) · CPC title

• H01H33/593

  for ensuring operation of the switch at a predetermined point of the AC cycle (for multipolar switches H01H9/563) · CPC title

• H01H33/59

  Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle · CPC title

• H01H9/56 Primary

  for ensuring operation of the switch at a predetermined point in the AC cycle · CPC title

• G01R19/175 Primary

  Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero · CPC title