Method, apparatus for operating a conduction assembly, start device, and computer-readable medium

Patent metadata

Field	Value
Publication number	US-12580557-B2
Application number	US-202318574743-A
Country	US
Kind code	B2
Filing date	Apr 19, 2023
Priority date	Apr 20, 2022
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

Embodiments of the present disclosure relate to a method, apparatus for operating a conduction assembly, a start device, and a computer-readable medium. The conduction assembly is coupled between an AC power supply and an inductive load, and comprises a first switch device and a second switch device which are in anti-series connection, the first switch device comprises a first body diode in anti-parallel connection with the first switch device, and the second switch device comprises a second body diode in anti-parallel connection with the second switch device. The method comprises: conducting the conduction assembly at a first conduction angle in a first cycle; conducting the conduction assembly in a second cycle at a second conduction angle that is greater than the first conduction angle, wherein in the first cycle and second cycle, a turn-off timing of the first switch device or the second switch device in anti-parallel connection with the first body diode or second body diode having a conduction direction the same as a current direction is determined based on the current flowing through the conduction assembly. The method proposed here may reduce the power loss of the soft start circuit.

First claim

We claim:

1 . A method of operating a conduction assembly, the conduction assembly being coupled between an AC power supply and an inductive load and comprising a first switch device and a second switch device which are connected in anti-series connection, the first switch device comprising a first body diode in anti-parallel connection with the first switch device, and the second switch device comprising a second body diode in anti-parallel connection with the second switch device, the method comprising:
conducting the first switch device and the second switch device at a first conduction angle in a first cycle; and conducting the first switch device and the second switch device in a second cycle at a second conduction angle that is greater than the first conduction angle, wherein in the first cycle and second cycle, a turn-off timing of the first switch device or the second switch device in anti-parallel connection with the first body diode or second body diode having a conduction direction the same as a current direction is determined based on the current flowing through the conduction assembly.

2 . The method according to claim 1 , wherein determining the turn-off timing based on the current comprises:
detecting a magnitude of the current; and in response to the current being less than a threshold, providing a turn-off signal to the first switch device or the second switch device in anti-parallel connection with the first body diode or the second body diode having a conduction direction the same as a current direction.

3 . The method according to claim 1 , wherein the method further comprises conducting the conduction assembly in at least one third cycle at at least one third conduction angle, wherein the conduction angle used in a subsequent cycle in the first, second and third cycles is greater than that used in a previous cycle.

4 . The method according to claim 1 , wherein the method further comprises providing a turn-off signal to the first switch device or the second switch device in response to the current being equal to zero.

5 . The method according to claim 1 , wherein the method further comprises determining an increase in the conduction angle per cycle based on a voltage boost slope of the inductive load and a preset boost curve.

6 . The method according to claim 2 , wherein the threshold is determined based on an accuracy of the detection of the current.

7 . The method according to claim 1 , wherein the turn-off timing comprises a voltage zero crossing point of the conduction assembly.

8 . An apparatus of operating a conduction assembly, the conduction assembly being coupled between an AC power supply and an inductive load and comprising a first switch device and a second switch device which are in anti-series connection, the first switch device comprising a first body diode in anti-parallel connection with the first switch device, and the second switch device comprising a second body diode in anti-parallel connection with the second switch device, the apparatus comprising:
a current sampling device for sampling the current in the conduction assembly; and a controller communicatively connected to the current sampling device and configured to perform a method, comprising: conducting the first switch device and the second switch device at a first conduction angle in a first cycle; and conducting the first switch device and the second switch device in a second cycle at a second conduction angle that is greater than the first conduction angle, wherein in the first cycle and second cycle, a turn-off timing of the first switch device or the second switch device in anti-parallel connection with the first body diode or second body diode having a conduction direction the same as a current direction is determined based on the current flowing through the conduction assembly.

9 . A start device, comprising:
a conduction assembly, being coupled between an AC power supply and an inductive load and comprising a first switch device and a second switch device which are in anti-series connection, the first switch device comprising a first body diode in anti-parallel connection with the first switch device, and the second switch device comprising a second body diode in anti-parallel connection with the second switch device, the start device configured to perform a method comprising: conducting the first switch device and the second switch device at a first conduction angle in a first cycle; and conducting the first switch device and the second switch device in a second cycle at a second conduction angle that is greater than the first conduction angle, wherein in the first cycle and second cycle, a turn-off timing of the first switch device or the second switch device in anti-parallel connection with the first body diode or second body diode having a conduction direction the same as a current direction is determined based on the current flowing through the conduction assembly.

10 . A non-transitory computer-readable medium having stored thereon computer-executable instructions that, when executed on a processor, perform the method according to claim 1 .

Assignees

• Schneider Electric Ind Sas

Inventors

• Chen Xiaohang
• Song Yangfeng
• Bai Wanlong
• Ling Qing
• Wu Zuoren
• Chen Jiamin

Classifications

• H03K17/136

  in thyristor switches · CPC title

• H03K17/04163

  in field-effect transistor switches · CPC title

• H03K17/725

  for AC voltages or currents (H03K17/722, H03K17/735 take precedence) · CPC title

• H03K17/6871

  the output circuit comprising more than one controlled field-effect transistor · CPC title

• H03K17/0822

  in field-effect transistor switches · CPC title