CN201332023Y

CN201332023Y - Combined capacitor for filtering and resonant vibration

Info

Publication number: CN201332023Y
Application number: CNU2008202063081U
Authority: CN
Inventors: 孔星; 尤枝辉
Original assignee: FOSHAN SHUNDE CHUANG GE ELECTRONIC INDUSTRY Co Ltd
Current assignee: FOSHAN SHUNDE CHUANG GE ELECTRONIC INDUSTRY Co Ltd
Priority date: 2008-12-29
Filing date: 2008-12-29
Publication date: 2009-10-21
Anticipated expiration: 2018-12-29

Abstract

The utility model discloses a combined capacitor for filtering and resonant vibration, wherein two capacitor bodies are arranged in a shell body, the two capacitor bodies are connected in series through a copper belt and are together provided with common leading-out ends, aluminum foil is packed on the peripheries of the capacitor bodies, flame-proof epoxide resin is further embedded in the shell body, the common leading-out ends and external ends of the two capacitor bodies together form three leading-out ends, and the three leading-out ends extend outside the shell body. The combined capacitor is characterized in that the two capacitor bodies are combined in the same capacitor shell body, and are led out only by one outer shell, which reduces the volume and the cost, furthermore, the two capacitor bodies are connected through the copper belt, the length of leading wires of the two capacitor bodies become shorter, which reduces the stray induction, the heat dissipation and the surge voltage which is generated during turning off a switch, and guarantees the stability of the capacitor, the aluminum foil is packed on the external surface of the capacitor bodies of the capacitor, which can reduce the integral heat resistance of the capacitor, and heat generated due to the heating of the capacitor is rapidly conducted away, which prolongs the service life of the capacitor even when the capacitor works in big current and high heating occasions.

Description

Filtering and resonance combined capacitor

Technical field

The utility model relates to the capacitor technology field, especially relates to a kind of being applied in the half-bridge inversion circuit, does the combined capacitor that filtering or resonance are used.

Background technology

In many circuit design, especially in half-bridge inversion circuit, behind power tube IGBT, generally use two resonant capacitances, as shown in Figure 1, when power tube IGBT conducting, capacitor C 3 and C4 form a resonant tank with inductance respectively.When this electric capacity uses, require big, the height that generates heat of resonance current, because switch constantly turn-offs, have high surge voltage to impact this electric capacity simultaneously.Present designer generally adopts after two independently electric capacity is installed in power tube IGBT, and doing so greatly increases cost and volume, installs also extremely inconvenient; Simultaneously, because after will being connected on switch to two electric capacity respectively, the stray inductance of lead-in wire is very big, the surge voltage of generation can become greatly, and heating simultaneously increases, and the stability of electric capacity can not get ensureing that therefore, the life-span can shorten.

The utility model content

The utility model purpose is to solve the deficiency that above-mentioned prior art exists, and provides a kind of cost combined capacitor relatively low, easy to use; It mainly is that two resonant capacitances are combined in the capacitor casing, so that this capacitor is easy for installation, reduces cost, and increases its useful life simultaneously, and protective circuit is stablized operate as normal.

Technical solution of the present utility model is as follows:

A kind of filtering and resonance combined capacitor, comprise housing, two capacitor bodies are installed in the described housing, two capacitor bodies are cascaded mutually by copper strips and are provided with public exit, the capacitor body periphery is surrounded by aluminium foil, also be perfused with fire retarding epoxide resin in the housing, three exits of the common formation in the outer end of public exit and two capacitor bodies, three exits extend outside the housing.Combined capacitor of the present utility model, two capacitor cores are combined in the capacitor casing, only draw with a shell, can reduce volume and cost. simultaneously because two electric capacity are connected by copper strips, the wire length of the two has shortened, reduce stray inductance and heating greatly, the surge voltage that produces when switch turn-offs also can reduce greatly, ensures the stability of electric capacity; In addition, during resonant capacitance work, resonance current is generally all very big, and the electric capacity heating is serious, many electric capacity are exactly the thermal breakdown inefficacy because heating is excessive, the life-span of long-term work electric capacity under high-temperature condition has derate, does not reach designed life, and this electric capacity has aluminium foil in the outsourcing of capacitor core sub-surface, can reduce the electric capacity overall thermal resistance, lead away rapidly producing heat, even make capacitor be operated in so big electric current, thermal field occurred frequently closes, and still has the longer life-span because of electric capacity heating.

The utility model can also adopt following technical measures to solve:

As enforcement more specifically, described public exit is the copper nut exit; The outer end of two capacitor bodies is the copper plug exit, the pin of copper plug directly is contained on the IGBT when client uses apart from coincideing with the pin distance of IGBT, significantly reduces conductor spacing, on our plastic casing fixed installation ear is arranged simultaneously, greatly made things convenient for the client to install and use.

Described housing is a plastic casing, and plastic casing also is fixed with mounting ear outward, so that capacitor installs and fixes.Different application circuits is selected different capacitance parameters for use, by electric capacity and the effective fixed combination of exit, we pour into by fire retarding epoxide resin, plastic casing encapsulation (band fixed installation hole), strengthen each inter-module insulating properties and make it form one, make the performance of device more stable, install more convenient, easier applying.

Two capacitor body peripheries in the described housing can be to be surrounded by aluminium foil separately, or two capacitor body peripheries are surrounded by same aluminium foil.

The beneficial effects of the utility model are as follows:

(1) combined capacitor of the present utility model is combined in two capacitor cores in the capacitor casing, only draws with a shell, can reduce volume and cost; Because two electric capacity connect by copper strips, the wire length of the two has shortened, and reduces stray inductance and heating greatly simultaneously, and the surge voltage that produces when switch turn-offs also can reduce greatly, and guarantee electric capacity is stablized operate as normal;

(2) stray inductance owing to combined capacitor reduces, be surrounded by the mode of aluminium foil again by the capacitor body periphery, reduce the electric capacity overall thermal resistance, increase its conductive coefficient, even make capacitor be operated in so big electric current, thermal field occurred frequently closes, its temperature rise is lower, has increased the useful life of capacitor greatly;

(3) incorporate combination capacitor, the drawing of realistic occasion installed and used more conveniently, reduced cost; Product design is become modular product, and the client is selecting application facet that great convenience is arranged, and standardized component is extensively adopted in the standardization of being more convenient for, and helps promoting the use of of product.

Description of drawings

Fig. 1 is half-bridge inversion circuit figure;

Fig. 2 is the structural representation of the utility model combined capacitor;

Fig. 3 is the utility model combined capacitor stereogram;

Fig. 4 is the other direction stereogram of Fig. 3 combined capacitor;

Fig. 5 is the internal circuit diagram of the utility model combined capacitor;

Fig. 6 is the elementary diagram of the utility model capacitor.

Among the figure: the 1st, capacitor body, the 2nd, public exit nut, the 3rd, exit inserted sheet, the 4th, mounting ear, the 5th, plastic casing, the 6th, fire retarding epoxide resin, the 7th, aluminium foil

Embodiment

Extremely shown in Figure 4 as Fig. 2, a kind of filtering and resonance combined capacitor, comprise the housing 5 that is made of plastics, the plastic casing 5 outer mounting ears 4 that also are fixed with, two capacitor bodies 1 are installed in the housing 5, two capacitor bodies 1 are cascaded mutually by copper strips and are provided with public exit 2, public exit 2 is copper nut exits, the outer end 3 of two capacitor bodies is the copper plug exit, two capacitor body 1 peripheries are surrounded by same aluminium foil 7, certainly, two capacitor body 1 peripheries in the housing 5 can be to be surrounded by aluminium foil 7 separately, also be perfused with fire retarding epoxide resin 6 in the described housing 5, three exits of outer end 3 common formations of public exit 2 and two capacitor bodies, three exits extend outside the housing 5.

As shown in Figure 5, it is the internal circuit diagram of the utility model capacitor, two capacitor body 1 is respectively C1 and C2, two capacitor body C1 and C2 connect mutually, and extend common port exit 2, promptly draw terminals A1, and the external terminal A2 of two capacitor bodies 1 and A3. constitute three ends and draw; The elementary diagram of this capacitor and half-bridge inversion circuit as shown in Figure 6, no longer describes in detail here.

Claims

1. filtering and resonance combined capacitor, comprise housing (5), it is characterized in that, two capacitor bodies (1) are installed in the described housing (5), two capacitor bodies (1) are cascaded mutually by copper strips and are provided with public exit (2), capacitor body (1) periphery is surrounded by aluminium foil (7), also be perfused with fire retarding epoxide resin (6) in the housing (5), the outer end (3) of public exit (2) and two capacitor bodies constitutes three exits jointly, and three exits extend outside the housing (5).

2. according to described filtering of claim 1 and resonance combined capacitor, it is characterized in that described public exit (2) is the copper nut exit.

3. according to claim 1 or 2 described filtering and resonance combined capacitor, it is characterized in that the outer end (2) of described two capacitor bodies (1) is the copper plug exit.

4. according to claim 1 or 2 described filtering and resonance combined capacitor, it is characterized in that described housing (5) is a plastic casing, and plastic casing also is fixed with mounting ear (4) outward.

5. according to claim 1 or 2 described filtering and resonance combined capacitor, it is characterized in that two capacitor bodies (1) periphery in the described housing (5) is surrounded by aluminium foil (7) separately.

6. according to claim 1 or 2 described filtering and resonance combined capacitor, it is characterized in that two capacitor bodies (1) periphery in the described housing (5) is surrounded by same aluminium foil (7).