Tyco Electronics Corporation

Littelfuse, Inc.

Other

Littlefuse, Inc.

Martyn A Matthiesen

Anthony Vranicar

Jianhua Chen

Wayne Montoya

Matthew Peter Galla

Christopher R Pasma

Josh Harris Golden

Luis A Navarro

Johnny Lam

Dapeng Hou

Josh H Golden

A fuse includes first, second, and third terminals disposed on a substrate. Respective ends of one or more primary conductors of the fuse are connected to one of the first and the second terminals. The primary conductors have a first conductivity and are configured to open when a primary current between the first and the second terminals exceeds a first predetermined threshold. One or more secondary conductors have an end connected to the third terminal. The secondary conductors are configured to ignite when a secondary current through the secondary conductors exceeds a second predetermined threshold. When ignited, the secondary conductors open the primary conductors to thereby stop the primary current.

Remote activated fuse and circuit

A circuit protection device includes a substrate with first and second electrodes connected to the circuit to be protected. The circuit protection device also includes a heater element. A sensing element facilitates an electrical connection between the first and second electrodes. A flux material is provided around the sensing element. In a preferred embodiment, the flux contains a first component that is a polar material and a second component that is a non-polar material. A spring element exerts a force on the sensing element. The sensing element resists the force applied by the spring element. Upon detection of an activation, or fault, condition, the sensing element loses resilience and no longer resists the force exerted by the spring element, resulting in the spring element severing the electrical connection between the first and second electrodes. The flux allows the spring element to sever the electrical connection without dragging the sensing element.

Reflowable circuit protection device

A circuit protection device includes a base assembly, a spring on top of the base, a conductive terminal that fits over the base and spring, and a cap that first over the base, spring and terminal. The base includes latches on the front side of the base. The conductive terminal includes a first end on the front side of the base and a second end on a rear side of the base that is opposite to the front side. The cap includes a first protrusion extending downward from the cap above one of the latches and a second protrusion extending downward from the cap above the other latch. The circuit protection device also includes a means for activating the circuit protection device after reflow in response to a force applied to the cap in a first direction defined from a top of the cap towards the base.

A circuit protection device is configured to protect circuit elements under any one of the following three activation conditions: an over current condition, an over temperature condition, and an activation control current received by a heater element. The circuit element includes first and second electrodes, and the heater element. A sliding contact is connected by a sensing element to the first electrode, second electrode, and heater element, thereby bridging and providing a conductive path between each. A spring element is held in tension by, and exerts a force against, the sliding contact. Upon detection of any one of three activation conditions, the sensing element releases the sliding contact and the force exerted by the spring element moves the sliding contact to another location on the substrate at which the sliding contact no longer provides a conductive path between the first electrode, second electrode, and heater element.

Three-function reflowable circuit protection device

A reflowable thermal fuse includes a positive-temperature-coefficient (PTC) device that defines a first end and a second end, a conduction element that defines a first end and a second end in electrical communication with the second end of the PTC device, and a restraining element that defines a first end in electrical communication with the first end of the PTC device and a second end, in electrical communication with a second end of the conduction element. The restraining element is adapted to prevent the conduction element from coming out of electrical communication with the PTC device in an installation state of the thermal fuse. During a fault condition, heat applied to the thermal fuse diverts current flowing between the first end of the PTC device and the second end of the conduction element to the restraining element, causing the restraining element to release the conduction element and activate the fuse.

Method of placing a thermal fuse on a panel

A circuit protection device includes a substrate with first and second electrodes connected to the circuit to be protected. The circuit protection device also includes a heater element between the first and second electrodes. A sliding contact is connected by a sensing element to the first electrode, second electrode, and heater element, thereby bridging and providing a conductive path between each. A spring element is held in tension by, and exerts a force parallel to a length of the substrate against, the sliding contact. Upon detection of an activation condition, the sensing element releases the sliding contact and the force exerted by the spring element moves the sliding contact to another location on the substrate at which the sliding contact no longer provides a conductive path between the first electrode, second electrode, and heater element.

A method for producing a surface mount device includes providing a plurality of layers including a B-staged top layer and bottom layer, and a C-staged middle layer with an opening. A core device is inserted into the openings, and then the top and bottom layers are placed over and under, respectively, the middle layer. The layers are cured until the layers become C-staged. The core device is substantially surrounded by an oxygen-barrier material with an oxygen permeability of less than approximately 0.4 cm3&#xb7;mm/m2&#xb7;atm&#xb7;day.

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Fremont, CA, United States of America

Martyn A Matthiesen