CN2743945Y

CN2743945Y - Flat inductor of high power density

Info

Publication number: CN2743945Y
Application number: CN 200420094258
Authority: CN
Inventors: 成烽; 李成军
Original assignee: ZHUHAI KEDE ELECTRONICS CO LTD
Current assignee: ZHUHAI KEDE ELECTRONICS CO LTD
Priority date: 2004-10-25
Filing date: 2004-10-25
Publication date: 2005-11-30
Anticipated expiration: 2014-10-25

Abstract

The utility model discloses a flat inductor with high power density which has the advantages of small volume, low unit power cost, high utilization rate of magnetic core sectional area, favorable saturation character, less copper wire consumption, large heat dissipation area, low temperature rise, low attrition and higher three dimensional space utilization rate of an entire transformer. The utility model comprises a magnetic core (1), a framework (2) and a copper wire winding group (3), wherein the magnetic core is formed by the cementation of two flat and E-shaped magnetic cores which are in the like the Chinese character 'ri' through butt joint, a central column of the magnetic core (1) is inserted inside the framework (2) which comprises a wire winding slot, the structure of the wire winding slot comprises upper and lower layers, and the copper wire winding group (3) is separately coiled in the wire winding slot; a pigtail splice I and a pigtail splice II are arranged on the framework (2), and the magnetic core (1) and the framework (2) are cemented into a whole through glue. The utility model can be widely used for the power factor correction of various kinds of electronic equipment and be widely used in harmonic filter circuits.

Description

The flat inductor of high power density

Technical field

The utility model relates to a kind of flat inductor of high power density.

Background technology

The application that power electronic equipment is increasingly extensive, make that the harmonic pollution problem is more and more serious, for the Switching Power Supply that is used in electronic installation or the Harmonics of Input of electric ballast meet the demands, must add power factor correction (PFC) circuit, and the PFC inducer that is used for wherein is an energy-storage travelling wave tube that enough big inductance value is arranged.

In the Switching Power Supply of various electronic equipments, the outputting inductance that is used to be output as the Switching Power Supply of DC (direct current) mainly plays level and smooth chokes and energy storage effect, it is connected with load usually, and the ability (promptly magnetic core is unsaturated under certain electric current) of bearing big electric current must be arranged.

The inductance that is in the output circuit part of electric ballast has the effect of resonance and energy storage concurrently, and it forms the resonance start-up circuit with output capacitance, and at next energy storage of steady-working state and choking effect.

Above inductor has two kinds of designs usually: a kind of is to increase air gap with the power FERRITE CORE, and another kind is with ferromagnetic powder cores such as Sendust and permalloys.Ferrocart core has higher saturation flux density and D.C. magnetic biasing dynamic property preferably, be used for making the PFC inductance and DC outputting inductance effect is better, because be used for the inductance of electron rectifier suitable inductance, high Q value, low alternating-current resistance and low-loss must be arranged, it is inappropriate making this inductance with ferrocart core usually.Because costing an arm and a leg and the stable mass production capabilities of present domestic nothing (or rarer) of magnetic core, and the mode that adopts the power ferrite magnetic core to increase air gap is made the low and suitable production in enormous quantities of this inductor price, so there is big competitive advantage, adopt conventional E type or ring type magnetic core to make above inductor in the prior art mostly, ubiquity height height, volume is big, unit power cost height, the utilization of magnetic core sectional area is not enough, saturability is poor, the copper cash that consumes is many, and area of dissipation is little, temperature rise, shortcomings such as loss is big, and the solid space utilance of whole transformer is low.

The utility model content

Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, provide that a kind of height is low, volume is little, the unit power cost is low, magnetic core sectional area utilance height, saturability is better, and the copper cash of consumption is less, area of dissipation is big, temperature rise is low, and loss is little, the flat inductor of the high power density that the solid space utilance of whole transformer is higher.

The technical scheme that the utility model adopted is: the utility model comprises magnetic core, skeleton, the copper cash winding, described magnetic core is by two flat E font magnetic cores butt joints that day font is bonding to be formed, the newel of described magnetic core is inserted in the described skeleton, the housing ring of described magnetic core is wrapping described skeleton and described copper cash winding, described skeleton comprises one or more winding slots, described copper cash winding is in described winding slot, described skeleton is provided with two or more pigtail splice I and two or more pigtail splice II, the head of described copper cash winding, tail and each tap are welded on respectively on described pigtail splice I and the described pigtail splice II, described pigtail splice I and described pigtail splice II are separately positioned on two of the same end face of described skeleton, described magnetic core, described skeleton is bonded into one by glue, the ratio of described magnetic core height and plane length was less than 3: 5, and the ratio of described magnetic core height and plane width was less than 1: 2.

Described core center column section is long-pending to be 75 square millimeters, and effective magnetic circuit length is 29.5 millimeters to 39.5 millimeters; Perhaps described core center column section is long-pending to be 85 square millimeters, and effective magnetic circuit length is 29.5 millimeters to 39.5 millimeters; Perhaps described core center column section is long-pending to be 88 square millimeters, and effective magnetic circuit length is 30.9 millimeters to 40.9 millimeters; Perhaps described core center column section is long-pending to be 102 square millimeters, and effective magnetic circuit length is 30.9 millimeters to 40.9 millimeters.

The beneficial effects of the utility model are: day font is bonding to be formed because the magnetic core that the utility model adopts is by two flat E font magnetic core butt joints, compare with the normal conventional inductance core, height dimension is less and gauge is bigger, and its described core center column section is long-pending to be minimum 75 square millimeters, effective magnetic circuit length is 29.5 millimeters to 39.5 millimeters, perhaps described core center column section is long-pending to be minimum 85 square millimeters, effective magnetic circuit length is 29.5 millimeters to 39.5 millimeters, perhaps described core center column section is long-pending to be minimum 88 square millimeters, effective magnetic circuit length is 30.9 millimeters to 40.9 millimeters, perhaps described core center column section is long-pending to be 102 square millimeters, and effective magnetic circuit length is minimum 30.9 millimeters to 40.9 millimeters, so the utility model whole height is low, volume is little, the unit power cost is low, magnetic core sectional area utilance height, saturability is better, and the copper cash of consumption is less, area of dissipation is big, temperature rise is low, and loss is little, and the solid space utilance of whole transformer is higher.

Description of drawings

Fig. 1 is the utility model decomposition texture schematic diagram;

Fig. 2 is the utility model skeleton structure schematic diagram;

Fig. 3 is the utility model core structure schematic diagram.

Embodiment

As Fig. 1, Fig. 2, shown in Figure 3, the utility model comprises magnetic core 1, skeleton 2, copper cash winding 3, described magnetic core 1 is by two flat E font magnetic cores butt joints that day font is bonding to be formed, the newel of described magnetic core 1 is inserted in the described skeleton 2, the housing ring of described magnetic core 1 is wrapping described skeleton 2 and described copper cash winding 3, described skeleton 2 cross sections are three-back-shaped, described skeleton 2 comprises, the winding slot I4 of understructure and winding slot II5, described winding slot I4 and winding slot II5 constitute described skeleton 2 vertical sections and are king's font, described copper cash winding 3 minutes is in described winding slot I4 and winding slot II5, described skeleton 2 is provided with pigtail splice I6, pigtail splice I7, pigtail splice I8, pigtail splice I9, pigtail splice I10 and pigtail splice II11, pigtail splice II12, pigtail splice II13, pigtail splice II14, pigtail splice II15, the head of described copper cash winding 3, tail and each tap are welded on described pigtail splice I6 respectively, pigtail splice I7, pigtail splice I8, pigtail splice I9, pigtail splice I10 and pigtail splice II11, pigtail splice II12, pigtail splice II13, pigtail splice II14, on the pigtail splice II15, described pigtail splice I6, pigtail splice I7, pigtail splice I8, pigtail splice I9, pigtail splice I10 and pigtail splice II11, pigtail splice II12, pigtail splice II13, pigtail splice II14, pigtail splice II15 is separately positioned on the both sides of described skeleton 2 same end faces, described magnetic core 1, skeleton 2 is bonded into one by glue.

Described copper cash winding 3 in the present embodiment comprises two identical coils, each coil has totally three taps of initial and end and centre cap, one of them coil is in described winding slot I4, its initial and end and centre cap be welded on respectively pigtail splice I 6,8,10 on, another coil is in described winding slot II5, its initial and end and centre cap be welded on respectively pigtail splice II 11,13,15 on, described magnetic core 1 newel sectional area is minimum 75 square millimeters, and effective magnetic circuit length is 29.5 millimeters to 39.5 millimeters.

Can make magnetic core and coil reach best collocation by optimal design to magnetic core and skeleton.Make full use of the cross-sectional area of magnetic core, can reach big inductance value and saturability well; Whole winding is as often as possible placed among the magnetic core, and then magnetic screen is abundant, anti-EMI function admirable, and simultaneously, the power of unit volume transmission is big, i.e. the power density height.Volume reduces, and has reduced the consumption of copper cash, and relative cost reduces.And the alternating-current resistance of product is little, and loss is little, the efficient height, and it is big to have area of dissipation simultaneously, the advantage that distributed capacitance is little, temperature rise reduction, reliability strengthen.Its maximum height is 15.0mm, especially is fit to be applied to the higher T5 electric ballast of output.

Claims

1, a kind of flat inductor of high power density, it comprises magnetic core (1), skeleton (2), copper cash winding (3), described magnetic core (1) is by two flat E font magnetic cores butt joints that day font is bonding to be formed, the newel of described magnetic core (1) is inserted in the described skeleton (2), the housing ring of described magnetic core (1) is wrapping described skeleton (2) and described copper cash winding (3), described skeleton (2) comprises one or more winding slots (4,5), described copper cash winding (3) is around described winding slot (4,5) in, described skeleton (2) is provided with two or more pigtail splice I (6,7,8,9,10) and two or more pigtail splice II (11,12,13,14,15), the head of described copper cash winding (3), tail and each tap are welded on described pigtail splice I (6 respectively, 7,8,9,10) and described pigtail splice II (11,12,13,14,15) on, described pigtail splice I (6,7,8,9,10) and described pigtail splice II (11,12,13,14,15) be separately positioned on two of the same end face of described skeleton (2), described magnetic core (1), described skeleton (2) is bonded into one by glue, it is characterized in that: the ratio of described magnetic core (1) height and plane length is less than 3: 5, and the ratio of described magnetic core (1) height and plane width was less than 1: 2.

2, the flat inductor of high power density according to claim 1 is characterized in that: described magnetic core (1) newel sectional area is 75 square millimeters, and effective magnetic circuit length is 29.5 millimeters to 39.5 millimeters; Perhaps described magnetic core (1) newel sectional area is 85 square millimeters, and effective magnetic circuit length is 29.5 millimeters to 39.5 millimeters; Perhaps described magnetic core (1) newel sectional area is 88 square millimeters, and effective magnetic circuit length is 30.9 millimeters to 40.9 millimeters; Perhaps described magnetic core (1) newel sectional area is 102 square millimeters, and effective magnetic circuit length is 30.9 millimeters to 40.9 millimeters.