Microbreaker for portable device, and method of manufacturing microbreaker for portable device

Abstract

The present invention reliably prevents temporary disconnections caused by strong impacts. The present invention does not require a high degree of precision in component processing or assembly, makesmass production at a low cost possible, and reliably inhibits temporary disconnections. Provided is a microbreaker for a portable device, connected in series to a battery and comprising: a movable contact plate (1) formed by providing a movable contact (3) at the distal end of an elastic arm (5); a fixed contact plate (2) formed by providing a fixed contact (4) in a location facing the movable contact (3); a bimetal (6) that, at a set temperature, separates the movable contact (3) from the fixed contact (4) so as to turn the movable contact OFF; and a PT (7Y) for preventing temporary disconnection, configured to contact the fixed contact plate (2) and the movable contact plate (1).

Description

technical field [0001] The present invention mainly relates to a miniature circuit breaker for portable devices used as a protection element among portable devices such as smart phones and tablet computers, and a manufacturing method thereof. [0002] In this specification, a "miniature circuit breaker" refers to an ultra-small circuit breaker with a thickness of 2 mm or less. Background technique [0003] Portable devices have built-in PTCs, fuses, and miniature circuit breakers as battery protection elements. If the PTC is higher than the set temperature, it will trip, which will cause the impedance value to increase sharply and cut off the current. If the fuse reaches the set temperature, it will melt and cut off the current. If the miniature circuit breaker reaches the set temperature, the movable contact will Separate from the fixed contact to cut off the current. The PTC has a disadvantage that the low resistance value of the resistance in the non-tripped state is la...

AI Technical Summary

Problems solved by technology

PTC has the following disadvantages: the low resistance value of the resistance in the non-tripped state is larger than the contact resistance of the contact, and the power loss becomes large in a portable device with a large current

Fuses have the disadvantage that if blown they cannot be used again thereafter

The miniature circuit breaker cannot prevent the momentary disconnection in which the movable contact is separated from the fixed contact due to impact such as a drop of the portable device, and the power supply is switched off in an instant.

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