CN101183599B

CN101183599B - Primary and secondary isolation type high frequency transformer

Info

Publication number: CN101183599B
Application number: CN2007100309867A
Authority: CN
Inventors: 张韶英
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-15
Filing date: 2007-10-15
Publication date: 2010-07-14
Anticipated expiration: 2027-10-15
Also published as: CN101183599A

Abstract

The invention relates to a minitype first-class isolated type high frequency transformer with a efficiency of energy-saving and environmental protection, which comprises a frame, a magnetic core arranged on the frame, a primary coil winding on the frame, a secondary coil winding outside of the magnetic core, an insulation layer is interval arranged between the primary coil and the secondary coil. The secondary coil comprises at least a secondary coil group A and two secondary coil groups B; wherein the two secondary coil groups B are respectively winded around the secondary coil group A. Both wire winding ends of the two secondary coil groups B are connected with a diode rectifier respectively and the joint is used as an output end. One wire winding end of the secondary coil A is connected with the wire winding central section of two secondary coil groups B and the other end is used as the other output end. The two output ends are connected with a capacitor in parallel. The invention has the advantages of uniform current distribution, high ampere density, high power density, high efficiency, low leakage inductance, good high frequency characteristics, good heat dispersion, simple structure, good isolation and low cost.

Description

The primary and secondary isolation type high frequency transformer

[technical field]

The present invention relates to a kind of transformer, especially relate to a kind of have volume little, isolate, the density height, power is big, leakage inductance is little and the primary and secondary isolation type high frequency transformer of current uniform characteristics.

[background technology]

High frequency transformer is a kind of high pressure to be converted to the power supply unit of low pressure, and the novel high-frequency transformer still is to utilize electromagnetic induction principle that electric energy is transmitted between two circuit, and its basic structure is the same with conventional transformer, is made of magnetic core and winding.At present, general high frequency transformer is made up of primary coil (high-pressure section), secondary coil (low-pressure section) and ancillary coil (first line low-pressure section), its general coiling be in proper order by primary coil to ancillary coil again to secondary coil, isolate with insulating tape between every group of coil.

Existing high frequency transformer exists that volume is big, dielectric loss is big and lead loss height, leakage inductance and the big shortcoming of stray capacitance, volume is big though the flat-plate transformer that pcb board is made has solved, leakage inductance and the big shortcoming of stray capacitance, but pcb board medium that it adopts and copper wires still exist the big and high major defect of lead loss of dielectric loss, the high frequency transformer that prior art is made seriously restricted the raising of its high frequency characteristics, hindered the demand for development of high frequency transformer high-frequency, high efficiency, small size.

[summary of the invention]

In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of have volume little, isolate, the density height, power is big, leakage inductance is little and the primary and secondary isolation type high frequency transformer of current uniform characteristics.

The technical solution adopted for the present invention to solve the technical problems is: a kind of primary and secondary isolation type high frequency transformer, comprise skeleton, magnetic core is housed on skeleton, on skeleton, be wound with primary coil, be wound with secondary coil in the magnetic core periphery, every insulating barrier is housed, described secondary coil has first secondary coil and second subprime coil and level coil for the third time at least between primary coil and the secondary coil, the second subprime coil and for the third time a grade coil twine respectively and be contained in the first secondary coil periphery; Described second subprime coil and for the third time the level coil-winding an adjacent end be coupled to each other, their other end joins after being connected with diode rectification respectively, its contact as output an end points, one end of first level coil-winding and second subprime coil and for the third time the interface of a level coil-winding adjacent end link, the other end of first level coil-winding is parallel with capacitor as another end points of output between two exit points.

The invention has the beneficial effects as follows: have that CURRENT DISTRIBUTION is even, current density is high, power density is high, efficient is high, leakage inductance is low, high frequency characteristics is good, thermal diffusivity is good, simple in structure, isolate, low cost and other advantages; The present invention can be applied to aspects such as notebook computer, automotive electronics, digital camera, digital to television, is suitable for surface mount, realizes that electronic product is light, thin, the designing requirement of miniaturization.

[description of drawings]

Fig. 1 is circuit theory diagrams of the present invention;

Fig. 2 is the structural representation of described secondary coil of the present invention.

Among the figure: 1-primary coil, 2-first secondary coil, 3-second subprime coil, 5-be the level coil for the third time, 4-magnetic core, D-diode, C-capacitor.

[embodiment]

The present invention is further described below in conjunction with drawings and Examples.

Referring to Fig. 1 and Fig. 2, a kind of primary and secondary isolation type high frequency transformer, comprise skeleton, magnetic core 4 is housed on skeleton, on skeleton, be wound with primary coil 1, be wound with secondary coil in magnetic core 4 peripheries, between primary coil 1 and the secondary coil every insulating barrier is housed, described secondary coil has first secondary coil 2 and second subprime coil 3 and level coil 5 for the third time at least, second subprime coil 3 and for the third time a grade coil 5 twine respectively and be contained in first secondary coil, 2 peripheries; Join after the two ends of described second subprime coil 3 and level coil 5 coiling for the third time are connected with diode D rectification respectively, its contact is as an end points of output, the interface of one end of first secondary coil, 2 coilings and second subprime coil 3 and the adjacent end of level coil 5 coilings for the third time links, the other end of first secondary coil, 2 coilings is parallel with capacitor C as another end points of output between two exit points.

A common output voltage is that 5V, electric current are the semibridge system DC/DC power supply of 150A, adopted the present invention after, power supply thickness only is 12mm, its power supply fan-out capability has surpassed all little profile power supplys.Leakage inductance of the present invention is extremely low, and thermal diffusivity is good, and simultaneously, under full-load conditions, the efficient of this power supply is up to more than 82%, and the efficient of the transformer of this power supply, inductor components is 98.5%.

The present invention is a kind of high-tech ferrite inductance element newly developed, can be applied to aspects such as notebook computer, automotive electronics, digital camera, digital to television; The present invention is fit to surface mount, and electronic product is realized that light, thin, miniaturization will play a crucial role.

In a word, along with the development of electronics, information technology, the application of the inductance ferrite component of miniaturization, miniature primary and secondary high frequency transformer is more and more wider.In the electronics high-tech sector, the present invention is very fast replacement traditional transformer, and progressively accomplishes scale production.

Claims

1. primary and secondary isolation type high frequency transformer, comprise skeleton, magnetic core is housed on skeleton, on skeleton, be wound with primary coil, be wound with secondary coil in the magnetic core periphery, every insulating barrier is housed, it is characterized in that between primary coil and the secondary coil: described secondary coil has first secondary coil and second subprime coil and level coil for the third time at least, the second subprime coil and for the third time a grade coil twine respectively and be contained in the first secondary coil periphery; Described second subprime coil and for the third time the level coil-winding an adjacent end be coupled to each other, their other end joins after being connected with diode rectification respectively, its contact as output an end points, one end of first level coil-winding and second subprime coil and for the third time the interface of a level coil-winding adjacent end link, the other end of first level coil-winding is parallel with capacitor as another end points of output between two exit points.