CN200972829Y

CN200972829Y - Low equivalent series resistance paster capacitor

Info

Publication number: CN200972829Y
Application number: CN 200620133752
Authority: CN
Inventors: 吕林兴; 陈键; 蒋春强; 周萍; 潘平华; 金源
Original assignee: State Run Factory 4326 of China Zhenhua Group Xinyun Electronic Comp and Dev Co Ltd
Current assignee: State Run Factory 4326 of China Zhenhua Group Xinyun Electronic Comp and Dev Co Ltd
Priority date: 2006-11-23
Filing date: 2006-11-23
Publication date: 2007-11-07
Anticipated expiration: 2016-11-23

Abstract

The utility model discloses a chip capacitor having a low equivalent series resistance, belongs to the electric component field, and aims to provide a solid electrolytic capacitor having a stable capacitance and a low equivalent series resistance. The capacitor comprises an insulating shell and a plurality of capacitor cores. A capacitor core consists of tantalum wires, an anodic tantalum core, a dielectric film covering the surface of the anodic tantalum core, and a cathode layer. The cathode layer consists of a manganese dioxide layer, a graphite layer and a silver paste layer that are coated on the dielectric film in order. A plurality of capacitor cores are pasted in series via the silver paste layer (5) to form a core pack, and the cathode layer and electrode tab (7) of each capacitor core are rigidly connected to form a serial structure, and each tantalum wire (1) is rigidly connected with the other electrode tab (7) to form a serial structure. Two electrode tabs (7) stretch out of the insulating shell (6) that covers the surface of the core pack. The utility model has a simple structure, a convenient production process, a low equivalent series resistance, and a stable capacitance, and is thus an ideal electric component.

Description

Low ESR patch capacitor device

Technical field: the utility model relates to a kind of solid electrolytic capacitor, relates in particular to a kind of chip-type solid electrolytic capacitor of low ESR value.

Background technology: well-known, present widely used tantalum electrolytic capacitor has characteristics such as reliability height, leakage current are little, stable performance, along with complete electronic sets such as instrument and meter to miniaturization, integrated and intelligentized development, promoted tantalum electrolytic capacitor and developed to directions such as miniaturization, chip type, high frequency low ESR value and Chinese People's Anti-Japanese Military and Political College's surge current abilities; Yet the equivalent series impedance of traditional tantalum electrolytic capacitor is bigger, can not satisfy the needs of modem electronic circuitry development.

Summary of the invention: at the above-mentioned defective that exists in the prior art, the utility model aims to provide a kind of low ESR patch capacitor device, and it has advantages such as capacitance is stable, equivalent series impedance is little.

To achieve these goals, the utility model is by the following technical solutions: it comprises insulation crust and capacitor body, described capacitor body is made of the anode tantalum piece that is fixed with tantalum wire, the cathode layer that is coated on the deielectric-coating on this tantalum piece surface and is coated on this deielectric-coating surface, and described cathode layer is made of manganese dioxide layer, graphite linings and the silver slurry layer that order is coated on the described deielectric-coating; At least two capacitor bodies bond together by the silver slurry layer parallel connection and form the fuse group, and wherein the cathode layer of each capacitor body and the electrode lead-out tablet tantalum wire and another cube electrode lead-out tablet that are fixedly connected to form parallel-connection structure, each capacitor body is fixedly connected to form parallel-connection structure; Two cube electrode lead-out tablets stretch out from the insulation crust that is encapsulated in described fuse group surface.

Be with insulation spacer on the tantalum wire of described each capacitor body; Insulation crust is an epoxy package.

Compared with the prior art, the utility model is on the basis of conventional solid electrolysis tantalum capacitor basic structure two or more capacitor bodies to be connected in parallel by silver slurry layer is bonding, under the situation that does not change existing technology, increased the surface area of anode tantalum piece effectively, thereby greatly reduce the equivalent series impedance (ESR) of capacitor, make the capacitance of capacitor more stable.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the A-A cutaway view among Fig. 1;

Fig. 3 is the curve chart of the capacitance of 25V100 μ F provided by the utility model, two kinds of specification capacitors of 10V100 μ F with frequency change;

Fig. 4 is the curve chart of the equivalent series impedance of 25V100 μ F provided by the utility model, two kinds of specification capacitors of 10V100 μ F with frequency change;

Fig. 5 is that the capacitance of conventional solid electrolysis tantalum capacitor of 6.3V470 μ F, 10V100 μ F, 25V100 μ F, 35V22 μ F, five kinds of specifications of 35V4.7 μ F is with the curve chart of frequency change;

Fig. 6 is that the equivalent series impedance of conventional solid electrolysis tantalum capacitor of 6.3V470 μ F, 10V100 μ F, 25V100 μ F, 35V22 μ F, five kinds of specifications of 35V4.7 μ F is with the curve chart of frequency change.

Among the figure: tantalum wire 1 anode tantalum piece 2 manganese dioxide layers 3 graphite linings 4 silver slurry layers 5 insulation crusts 6 electrode lead-out tablets 7 insulation spacers 8

Embodiment: the utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment:

In Fig. 1～2, capacitor body by anode tantalum piece 2, firmly be inserted into the tantalum wire 1 of this tantalum piece one end, the cathode layer that is coated on the deielectric-coating on anode tantalum piece 2 surfaces and is coated on this deielectric-coating surface constitutes; Described cathode layer is made of manganese dioxide layer 3, graphite linings 4 and the silver slurry layer 5 that order is coated on the described deielectric-coating, and anode is made of tantalum wire 1 and anode tantalum piece 2.Described two capacitor bodies bond together by silver slurry layer 5 and form the fuse group, and the tantalum wire 1 that the cathode layer of each capacitor body and electrode lead-out tablet 7 are fixedly connected to form parallel-connection structure, each capacitor body is fixedly connected to form parallel-connection structure with another cube electrode lead-out tablet 7; Described fuse group is by insulation crust 6 airtight sealing, and above-mentioned two cube electrode lead-out tablets 7 stretch out from the insulation crust of being made by epoxy resin 6.Contact with cathode layer and cause short circuit for fear of tantalum wire 1, on the tantalum wire 1 of each capacitor body, be provided with insulation spacer 8.Certainly, the quantity that constitutes the capacitor body of fuse group is not limited to two, and it can be made of plural capacitor body as required.

Fig. 3 and Fig. 5 are compared as can be seen, apparent in view variation just takes place in capacitor provided by the utility model its capacitance when frequency reaches 90～100KHZ, and apparent in view variation has just taken place in conventional solid electrolysis tantalum capacitor its capacitance when frequency reaches 30KHZ of same size, therefore the utlity model has the more stable characteristics of capacitance.

Fig. 4 and Fig. 6 are compared as can be seen, capacitor provided by the utility model its equivalent series impedance (ESR) when frequency reaches 1MHZ just increases gradually, and the conventional solid electrolysis tantalum capacitor of same size its equivalent series impedance (ESR) when frequency reaches 40～100KHZ has just obviously increased, and therefore the utlity model has equivalent series impedance (ESR) characteristics lower than traditional product.

Claims

1. low ESR patch capacitor device, comprise insulation crust and capacitor body, described capacitor body is made of the anode tantalum piece that is fixed with tantalum wire, the cathode layer that is coated on the deielectric-coating on this tantalum piece surface and is coated on this deielectric-coating surface, and described cathode layer is made of manganese dioxide layer, graphite linings and the silver slurry layer that order is coated on the described deielectric-coating; It is characterized in that: at least two capacitor bodies bond together by silver slurry layer (5) parallel connection and form the fuse group, and wherein the cathode layer of each capacitor body and electrode lead-out tablet (7) tantalum wire (1) and another cube electrode lead-out tablet (7) of being fixedly connected to form parallel-connection structure, each capacitor body is fixedly connected to form parallel-connection structure; Two cube electrode lead-out tablets (7) stretch out from the insulation crust (6) that is encapsulated in described fuse group surface.

2. low ESR patch capacitor device according to claim 1 is characterized in that: be with insulation spacer (8) on the tantalum wire of described each capacitor body (1).

3. low ESR patch capacitor device according to claim 1 and 2 is characterized in that: insulation crust (6) is an epoxy package.