公开(公告)号：US12063032B2

公开(公告)日：2024-08-13

申请号：US18202372

申请日：2023-05-26

Applicant: Littelfuse, Inc.

Inventor： Bret R. Howe

IPC: H03K17/13 ,  H03K3/037 ,  H03K19/20

CPC classification number: H03K17/13 ,  H03K3/037 ,  H03K19/20

Abstract: A relay circuit, including a solid state relay switch, connected to a first relay line and to a charging capacitor, and connected to a second relay line. The relay circuit may also include a solid state relay control circuit, coupled between the charging capacitor and the solid state relay switch. The solid state relay control circuit may include a voltage detection circuit, having an input coupled to an output of the charging capacitor, and having an output arranged to generate a LOW voltage signal when a voltage level of the charging capacitor is below a low threshold value. The solid state relay control circuit may also include a zero crossing circuit, coupled to the first relay line and the second relay line, and having an output to generate a clock signal when a zero crossing event takes place between the first relay line and the second relay line.

公开(公告)号：US11799474B1

公开(公告)日：2023-10-24

申请号：US17735639

申请日：2022-05-03

Applicant: Littelfuse, Inc.

Inventor： Bret R. Howe

IPC: H03K17/687 ,  H01H47/00 ,  H02H3/08 ,  H02H3/10 ,  H02H3/20 ,  H03K17/06 ,  H03K19/20

CPC classification number: H03K17/687 ,  H03K17/063 ,  H03K19/20 ,  H03K2217/0081

Abstract: A relay circuit may include a solid state relay switch, coupled to an external voltage line and to an charging capacitor; and a solid state relay control circuit, coupled between the charging capacitor and the solid state relay switch. The solid state relay control circuit may be arranged to: turn the solid state relay switch to an OFF state when a capacitor voltage of the charging capacitor falls below a low threshold value; and change the solid state relay switch from the OFF state to an ON state when the capacitor voltage increases above a high threshold value.

公开(公告)号：US11881849B2

公开(公告)日：2024-01-23

申请号：US17735639

申请日：2022-05-03

Applicant: Littelfuse, Inc.

Inventor： Bret R. Howe

IPC: H03K17/687 ,  H01H47/00 ,  H02H3/08 ,  H02H3/10 ,  H02H3/20 ,  H03K17/06 ,  H03K19/20

CPC classification number: H03K17/687 ,  H03K17/063 ,  H03K19/20 ,  H03K2217/0081

Abstract: A relay circuit may include a solid state relay switch, coupled to an external voltage line and to an charging capacitor; and a solid state relay control circuit, coupled between the charging capacitor and the solid state relay switch. The solid state relay control circuit may be arranged to: turn the solid state relay switch to an OFF state when a capacitor voltage of the charging capacitor falls below a low threshold value; and change the solid state relay switch from the OFF state to an ON state when the capacitor voltage increases above a high threshold value.

公开(公告)号：US11689196B1

公开(公告)日：2023-06-27

申请号：US17735629

申请日：2022-05-03

Applicant: Littelfuse, Inc.

Inventor： Bret R. Howe

IPC: H03K17/13 ,  H03K3/037 ,  H03K19/20

CPC classification number: H03K17/13 ,  H03K3/037 ,  H03K19/20

Abstract: A relay circuit, including a solid state relay switch, connected to a first relay line and to a charging capacitor, and connected to a second relay line. The relay circuit may also include a solid state relay control circuit, coupled between the charging capacitor and the solid state relay switch. The solid state relay control circuit may include a voltage detection circuit, having an input coupled to an output of the charging capacitor, and having an output arranged to generate a LOW voltage signal when a voltage level of the charging capacitor is below a low threshold value. The solid state relay control circuit may also include a zero crossing circuit, coupled to the first relay line and the second relay line, and having an output to generate a clock signal when a zero crossing event takes place between the first relay line and the second relay line.