Protective element
AssigneeSony Chemicals Corp.
InventorsKazutaka Furuta, Norikazu Iwasaki
Life of this patent
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Abstract
A protective element includes at least three electrodes provided on one PTC material. The PTC material operates as at least two PTC elements. This protective element can be manufactured, with fewer components, in an easy manner, and at lower cost, and can cope with overcurrent and overvoltage.
Claims5
A protective circuit, comprising a protective element and a switching element, wherein said protective element comprises one PTC material and at least three electrodes provided therein, and the PTC material operating as at least a first PTC element and a second PTC element, wherein the first PTC element is connected in parallel with the switching element and the second PTC element connected in series;
- the switching element enables the conduction of current to the second PTC element under regular operation and interrupts the conduction of current to the second PTC element when a terminal voltage of the circuit to be protected is higher than a predetermined voltage;
- and the first PTC element trips due to the conducted current.
A protective element, comprising:
- a single PTC material having a first end surface, a second end surface, a first side surface and a second side surface;
- and
- at least three electrodes provided on the first side surface, wherein at least one of the electrodes is also provided on at least the first end surface and at least a portion of the second side surface.
Dependencies are inferred from the claim text.