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US 8,558,656 B2Granted
Over-current protection device
AssigneePolytronics Technology Corp.
InventorsDavid Shau Chew Wang, Chun Teng Tseng
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AssigneePolytronics Technology Corp.
InventorsDavid Shau Chew Wang, Chun Teng Tseng
Estimating the term…
An over-current protection device comprises a resistance material with positive or negative temperature coefficient and an upper surface and a lower surface; a first electrode layer having a first groove, disposed on the upper surface; a first surface mount pad disposed on the upper surface; a second electrode layer disposed on the lower surface, electrically connecting to the first surface mount pad; a second surface mount pad disposed on the lower surface, electrically connecting to the first electrode layer; a second groove electrically separating the first surface mount pad from the first electrode layer; and a third groove electrically separating the second electrode layer from the second surface mount pad. The first groove divides the first electrode layer into two connected regions. The first and second surface mount pads are separated from each other and one end of the first groove connects to the second groove.
An over-current protection device, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Responsive to excess current: current limitation using PTC resistors, i.e. resistors with a large positive temperature coefficient
For devices having insulated gate electrodes, e.g. for IGFETs or IGBTs: using passive elements as protective elements
Emergency protective circuit arrangements
Inorganic electric semiconductor devices
About 4 years 11 months of term left · ends 19 Sep 2031 (estimated)
1. Field of the Invention
The present invention relates to an over-current protection device.
2. Description of the Related Art
The invention will be described according to the appended drawings in which:
FIG. 1 is a view showing a cross-section of an over-current protection device according to one embodiment of the present invention;
FIG. 2A is a view showing a first groove pattern according to the first embodiment of the present invention;
The present invention provides a design of electrode components 51, as shown in FIG. 12, of an over-current protection device. Through the design of electric characteristics and the technique of electrode patterning, electrode components 51 extending parallel to each other are patterned into a plurality of independent and adjoining regions 52 as shown in FIG. 12 so that a single over-current protection device can be divided into a plurality of sub-devices, which are electrically connected in parallel. The adjustment of the dimension of the independent regions 52 and the distance between adjacent independent regions 52 can change the electric fields E of the sub-devices. If the over-current protection device has resistance R, the reciprocal of the resistance R is obtained by adding the reciprocals of the resistances R1 to Rn of the plurality of independent regions 52.
1 R = ∑ i = 1 n 1 R i ,
where n is the number of the independent regions 52.