Electronic Concepts Inc.

US Government as Represented by the Secretary of the Army

Electronics Concepts, Inc.

Bernard Lavene

David Curto

Alan Schach

Michael Binder

Robert J Mammone

Joseph Bond

A heat pipe cooled capacitor includes a capacitor body having opposing first and second ends and an opening defined between the opposing ends. A first heat pipe is thermally and electrically connected to the first end of the capacitor body. A second heat pipe is positioned at least partially through the opening of the capacitor body. The second heat pipe is thermally connected to the second end of the capacitor body, and electrically isolated from the first heat pipe.

Thermal control for capacitor

Multiple wound film capacitors include a hollow core formed by a first non-conducting tubular section, and a first capacitor winding wrapped around the first non-conducting tubular section. Also included are a second non-conducting tubular section wrapped around the first capacitor winding, and a second capacitor winding wrapped around the second non-conducting tubular section. The multiple wound film capacitors may also include a third non-conducting tubular section wrapped around the second capacitor winding, and a third capacitor winding wrapped around the third non-conducting tubular section. In addition, ends of the first and second non-conducting tubular sections extend beyond ends of the first and second capacitor windings.

Multiple concentric wound film capacitors

A capacitor providing a thermal alert includes a wound film capacitor for carrying a large current when coupled to an AC generator. The wound film capacitor includes a hollow core extending from one end to another end of the capacitor. Also included are an in-line thermal switch, which is disposed in the hollow core for sensing a predetermined temperature; and a light indicator, which is coupled to the thermal switch. A single housing is integrally formed from an upper cover and a lower cover for housing the capacitor, the thermal switch and the light indicator. The upper cover of the housing is formed from translucent material. The thermal switch is configured to disconnect the wound film capacitor from the AC generator upon reaching the predetermined temperature, and activate the light indicator to emit a light. The upper cover is effective in transmitting the light from inside the housing to outside of the housing. The light indicator includes an incandescent light bulb, a neon bulb, or a light emitting diode (LED).

Large current carrying capacitor having a thermal disconnect with a light indicator

A capacitor having a large current carrying capacity includes a hollow core formed by a non-conducting tubular section, and a capacitor winding wrapped around the tubular section. A thermal cutoff device is disposed within the hollow core. The thermal cutoff device is configured to sense a predetermined temperature level within the hollow core and disable the current carrying capacity of the capacitor. The thermal cutoff device is disposed at a geometric center of the capacitor winding, which is also the hot spot of the capacitor winding. The thermal cutoff device includes first and second conductors electrically connected to each other with a predetermined solder alloy. The first conductor includes a cross-sectional portion that is attached to the second conductor. The cross-sectional portion is subjected to a springing force in a lateral direction away from the second conductor. Upon melting of the solder alloy, the springing force moves the cross-sectional portion away from the second conductor, thereby disabling the current carrying capacity of the capacitor.

Wound capacitor having a thermal disconnect at a hot spot

A metallized wound capacitor which includes first and second dielectric webs. A first electrode having first and second portions is metallized on the first face of the first web. A second electrode having first and second portions is metallized on the first face of the second web. Either the first electrode, the second electrode, or both, are included of a plurality of spaced apart segments interconnected by wirings. The first and second electrodes extend from opposing dielectric web longitudinal edges leaving respective bare margins along opposing edges on the respective webs. Each second portion has a width equal to the opposing bare margin less a predetermined tolerance and is thicker than its respective first portion.

Metallized capacitor having increased dielectric breakdown voltage and

A metallized film capacitor in which the metallization is made as thin as possible in order to increase the dielectric strength of the film. In the industry, typical metallization thicknesses range from approximately 1-4 ohms/sq, however, the present invention employs thicknesses which range from 5-300 ohms/sq. And, depending on which thickness is used, the effective dielectric strength of the film can be substantially increased. Additionally, the capacitor or various components thereof are exposed to a gas plasma for further increasing the dielectric breakdown voltage.

Method for making metallized capacitor having increased dielectric

A metallized film capacitor in which the metallization is made as thin as possible in order to increase the dielectric strength of the film. In the industry, typical metallization thicknesses range from approximately 1-4 ohms/sq, however, the present invention employs thicknesses which range from 5-300 ohms/sq. And, depending on which thickness is used, the effective dielectric strength of the film can be substantially increased.

The present invention involves a metallized wound capacitor having increased dielectric breakdown voltage which includes first and second dielectric webs. A first electrode having first and second portions, where the first portion is between 5-300 Ohms/square, is metallized on the first face of the first web, to a width less than the width of the first web. A second electrode having first and second portions is metallized on the first face of the second web to a width less than the width of the second web. The first and second electrodes extend from opposing dielectric web longitudinal edges leaving respective bare margins along opposing edges on the respective webs. Each second portion has a width equal to the opposing bare margin less a predetermined tolerance and is thicker than its respective first portion.

Metallized film capacitor with increased dielectric breakdown voltage

A capacitor module for use with an IGBT including an epoxy housing having two holes completely therethrough. Within the housing are two wound capacitors which are connected in parallel. Additionally, there are two mounting inserts which at least partially line the holes of the housing. The wound capacitors are also connected to the first and second mounting inserts which serve as the terminals for the capacitor module. As a result, the capacitor module exhibits very low self-inductance as well as very low ESR.

Capacitor module with epoxy housing and terminal mounting inserts

A hermetically sealed capacitor including a metal tape (e.g, copper) having an adhesive on one side and being folded and wrapped around the capacitor winding in the manner that a Christmas package is wrapped. After wrapping, the tape initially extends beyond both ends of the capacitor. The tape is then folded at one end of the capacitor. The seam of the tape overlapping itself (along the length of the capacitor) and the fold at the one end of the capacitor are each soldered. On the other end of the capacitor, a ceramic header having a through hole (for one of the capacitor leads) is positioned. The tape extends beyond the ceramic header and is folded so as to make contact with the ceramic header. The seam between the metal tape and the ceramic piece is then soldered. In this way, a small, hermetically sealed capacitor is obtained.

Hermetically sealed capacitor and method for making the same

The electrical breakdown strength of capacitors is increased by briefly esing the dielectric, the metal foil, and/or the fully assembled capacitor to a low pressure, low temperature gas plasma.

Capacitor with increased electrical breakdown strength and method of

A wrap and fill capacitor having a cuffed tape outer wrapping is provided. The cuff comprises a thin conductive foil folded about the edges of a high temperature resistant dielectric tape. The device is particularly suited for surface mounting.

Cuffed tape wrap and fill wound capacitor

A wound capacitor having high current carrying capacity in which a capacitor winding is wrapped around a core assembly having high thermal conductivity. The core assembly transfers thermal energy from the interior of the capacitor to the exterior. The ends of the core assembly extend outwardly beyond the terminals for radiating heat to the exterior of the capacitor thereby increasing the current carrying capacity of the capacitor. The core assembly includes separated metal portions secured to an electrically nonconductive portion. Cover seals may be positioned over the ends of the core assembly in contact with the terminals. The capacitor may be hermetically sealed. The metal portions and the electrically nonconductive portion may be hollow tubes forming a passageway through the entire length through the core assembly.

Hermetically sealed capacitor

An improved metallized wrapped capacitor pressed into a predetermined cross-sectional form substantially without edge radii, together with its method of manufacture are disclosed. The capacitor is formed from elongated mated dielectric webs, each having an electrode deposited on its face. The webs are superposed and rolled into a coil having concentric turns. The coil is pressed into a mold to derive a cross-section that mates with electrically conductive end caps. The end caps are affixed physically and electrically at each end of the formed capacitor element. The entire assembly with the exception of portions of the end caps are subjected to vacuum impregnation of epoxy resin to provide physical strength and to provide environmental protection. A form of coil mold is described.

Capacitor forming and manufacturing method

A planar terminated capacitor and a method for fabricating planar terminated capacitors is disclosed wherein a capacitor element is inserted in a nonconductive ceramic case. The case extends outwardly beyond the ends of the capacitor element forming cavities at each end of the case. Metal end caps are positioned at the ends of the case substantially enclosing the cavities. The end caps are electrically coupled to the ends of the capacitor element.

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Ocean, NJ, United States of America

Bernard Lavene