US 12,407,163 B2
Circuit protection device
Yi-An Sha, Taipei County (TW); and Chien Hui Wu, Zhudong Township, Hsinchu County (TW)
Assigned to POLYTRONICS TECHNOLOGY CORP., Hsinchu (TW)
Filed by Polytronics Technology Corp., Hsinchu (TW)
Filed on Dec. 12, 2022, as Appl. No. 18/079,652.
Claims priority of application No. 111120994 (TW), filed on Jun. 7, 2022.
Prior Publication US 2023/0396060 A1, Dec. 7, 2023
Int. Cl. H02H 9/02 (2006.01); H02H 9/04 (2006.01)
CPC H02H 9/026 (2013.01) [H02H 9/042 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A circuit protection device, comprising:
a temperature sensitive resistor element having a positive temperature coefficient (PTC) layer, a first electrically conductive layer and a second electrically conductive layer, wherein:
the PTC layer has a first surface and a second surface opposite to the first surface;
the first electrically conductive layer is disposed on the first surface, and has a first electrically conductive block, a second electrically conductive block and a trench, wherein the first electrically conductive block is electrically isolated and spaced apart from the second electrically conductive block at a distance by the trench; and
the second electrically conductive layer is disposed on the second surface;
a dielectric layer disposed in the trench, wherein:
the dielectric layer extends along a first direction between the first electrode and the second electrode, and the first direction is parallel to the first electrode and the second electrode; and
the trench has a bottom surface and a sidewall, and the bottom surface extends on the first surface and non-perpendicularly connects to the sidewall;
a first electrically insulating layer disposed on the first electrically conductive layer and covering the dielectric layer;
a first electrode and a second electrode disposed on the first electrically insulating layer, and electrically connected to the first electrically conductive block and the second electrically conductive block, respectively; and
a first conductive member, a left end and a right end opposite to the left end, wherein the left end has a first notch extending across the first electrically conductive layer, the PTC layer and the second electrically conductive layer, and the first conductive member is disposed in the first notch.