Polytronics Technology Corporation

Yao Te Chang

Yung Hsien Chang

Zhen Yu Dong

Hsiu Che Yen

David Shau Chew Wang

Chun Teng Tseng

Fu Hua Chu

Kuo Chang Lo

Yi An Sha

Takashi Hasunuma

Wen Feng Lee

Tsungmin Su

Pin Syuan Li

Ya Fang Liang

An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer comprises a polymer matrix and carbon black. The polymer matrix comprises a fluoropolymer having a melting point higher than 150&#xb0; C. The carbon black is dispersed in the polymer matrix. A resistance jump Rof the over-current protection device at 16V/50 A by 1000 cycles is 0.80-1.20. A resistance jump Rof the over-current protection device at 25V/50 A by 1000 cycles is 0.90-1.30.

Over-current protection device

An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer comprises a polymer matrix, a conductive ceramic filler, a carbon-containing conductive filler, and an inner filler. The polymer matrix comprises a fluoropolymer having a melting point higher than 150&#xb0; C. The inner filler is selected from one of aluminum nitride, silicon carbide, zirconium oxide, boron nitride, graphene, aluminum oxide, or any mixtures thereof, and comprises 2-10% by volume of the PTC material layer. The over-current protection device is able to mitigate negative temperature coefficient (NTC) behavior after trip of device, and achieves high hold current and high endurable power.

A cable comprises a power conductor, a data conductor and a first PTC device. The power conductor is configured to transmit electrical power between a source and a sink. The data conductor is configured to transmit data between the source and the sink. The first PTC device is coupled to the data conductor and its resistance increases drastically to decrease current flowing through the data conductor if a temperature of the first PTC device exceeds a first trip temperature. The first trip temperature is 55-80&#xb0; C. The resistance of the PTC device is larger than 20 k&#x3a9; at 85&#xb0; C. and larger than 80 k&#x3a9; at 100&#xb0; C. A current flowing through the data conductor does not exceed 20 mA.

Cable with over-temperature protection

A surface mountable over-current protection device comprises a PTC material layer, first and second conductive layers, left and right electrodes, left and right conductive members, and left and right insulating members. The PTC material layer comprises a left notch at a left end and a right notch at a right end. The first conductive layer comprises a primary portion disposed on an upper surface of the PTC material layer and a secondary portion extending over the left notch, and the second conductive layer comprises a primary portion disposed on a lower surface of the PTC material layer and a secondary portion extending over the underside of the right notch. The left conductive member connects to the left electrode and the first conductive layer and isolates from the second conductive layer. The right conductive member connects to the right electrode and the second conductive layer and isolates from the first conductive layer. The left and right insulating members are disposed in the left and right notches, respectively. The PTC material layer is not in direct contact with the left and right conductive members, and the primary portion and the secondary portion of the first or second conductive layer have different thicknesses.

Surface-mountable over-current protection device

An over-current protection device comprises a PTC device and a heating element operable to heat the PTC device. The PTC device contains crystalline polymer and metal or ceramic conductive filler dispersed therein. The PTC device has a resistivity less than 0.1 &#x3a9;&#xb7;cm. The over-current protection device has the relation: It (heating)&#x3c;Ih (60&#xb0; C.)&#xd7;10%, where Ih (60&#xb0; C.) is a hold current of the over-current protection device at 60&#xb0; C. when the heating element is not activated; It (heating) is a trip current of the over-current protection device when the heating element is activated to heat the PTC device. The PTC device has high hold current, thereby allowing a battery containing the device can be fast charged with a large current. In a specific situation, the heating element heats the PTC device to decrease the hold current of the over-current protection device of low resistivity, and accordingly the PTC device can trip by a small current.

An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer has a resistivity less than 0.05 &#x3a9;&#xb7;cm and comprises a polymer matrix, a conductive ceramic filler and a carbon-containing conductive filler. The polymer matrix comprises a fluoropolymer having a melting point higher than 150&#xb0; C. and comprises 50-60% by volume of the PTC material layer. The conductive ceramic filler having a resistivity less than 500&#x3bc;&#x3a9;&#xb7;cm is dispersed in the polymer matrix and comprises 40-45% by volume of the PTC material layer. The carbon-containing conductive filler is dispersed in the polymer matrix and comprises 0.5-5% by volume of the PTC material layer. At 25&#xb0; C., a ratio of a hold current to an area of the over-current protection device is 0.21-0.3 A/mm, and a ratio of an endurable power to the area of the over-current protection device is 4.8-7.2 W/mm.

A PTC device comprises two electrode layers and a PTC material layer laminated therebetween. The PTC material layer has a volumetric resistivity less than 0.2 &#x3a9;-cm, and comprises a crystalline polymer, conductive ceramic fillers and crystalline low molecular weight organic compound. The crystalline polymer comprises thermoplastic polymer, thermosetting polymer or combination thereof. The conductive ceramic fillers dispersed in the crystalline polymer have volumetric resistivity less than 500 &#x3bc;&#x3a9;-cm, and comprise 40-70% by volume of the PTC material layer. The crystalline low molecular weight organic compound has a molecular weight less than 5000, and comprises 6-30% by volume of the PTC material layer. The hold current at 60&#xb0; C. divided by a covered area of the PTC device is greater than 0.2 A/mm, the hold current at 60&#xb0; C. is 40-95% of the hold current at 25&#xb0; C., and the trip temperature of the PTC device is less than 95&#xb0; C.

Positive temperature coefficient device

An over-current protection device includes two metal foils and a PTC material layer. The PTC material layer is laminated between the two metal foils and has a resistivity less than 0.4 &#x3a9;-cm. The PTC material layer includes crystalline polymer and electrically conductive ceramic filler dispersed in the crystalline polymer. The conductive ceramic filler is of HCP structure and includes 70-95% by weight of the PTC material layer. The trip jump value of the over-current protection device after 300 times trip is less than or equal to 25. The resistance repeatability of the device can be effectively improved by adding the conductive ceramic filler.

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Linnei, Taiwan

Yao Te Chang