CN206225160U - A kind of low-voltage, high-current synchronous rectification transformer - Google Patents

Abstract

The utility model discloses a kind of low-voltage, high-current synchronous rectification transformer, including transformer shell, transformer center bar, transformer shell is provided with annular core, and the periphery of annular core is arranged with primary wires group；Two first copper bars, two second copper bars, two groups of power MOSFET tubes, two groups of MOSFET pipe busbars are additionally provided with, two groups of MOSFET pipe busbars are stacked；One group of S poles pin and one group of S poles welding copper bus of MOSFET pipe busbars of power MOSFET tube, D poles pin and this group of D poles welding copper bus of MOSFET pipe busbars, G poles pin are welded with the Copper Foil of driver circuit plate in this group of MOSFET pipe busbar.The utility model current-carrying capacity is big, and the rectification output that power MOSFET tube and MOSFE pipes busbar are constituted is stacked, and distributed inductance is small, impedance is low, and internal structure is compact, forms closed magnetic circuit, externally disturbs small, and Electro Magnetic Compatibility is good.

Description

A kind of low-voltage, high-current synchronous rectification transformer

Technical field

The utility model is related to switch power technology, more particularly to a kind of low-voltage, high-current synchronous rectification transformer.

Background technology

The common structure of low-voltage, high-current synchronous rectification transformer includes toroidal core, and input winding is around toroidal core On, copper pipe and copper bar are coated on the outside of toroidal core and outer ring and the inner ring of middle formation, and copper pipe and copper bar constitute high frequency and become The output winding of depressor, the copper pipe of this structure is with the connection of copper bar generally using being welded to connect, and welding processing requirement is high, and not Easily follow-up maintenance, and cause radiating effect poor, current-carrying capacity is small.In addition with frequency rectifier power source usually using power MOSFET Pipe transformer secondary output last night rectification output, D poles and the D poles welding copper bus of power MOSFET tube, S poles and S poles welding copper bus, G poles Pin is soldered on copper foil of circuit board, and the copper bar or wire of 3 poles extraction of MOSFET pipes are arranged apart, because low-voltage, high-current Synchronous rectified power is usually high frequency output, and under high frequency environment, the distributed inductance of this discrete copper bar is larger, increases circuit Loss, device easily generates heat damage.

Utility model content

In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of low-voltage, high-current synchronous rectification Transformer, it can overcome the problem that circuit loss is big, radiating effect is poor.

The purpose of this utility model is realized using following technical scheme：

A kind of low-voltage, high-current synchronous rectification transformer,

Including transformer shell, transformer center bar, there is a cavity, cavity open top, cavity in transformer shell body A hollow cylinder is inside provided with, the transformer center bar is fixed in the hollow cylinder；Annular core, annular iron are additionally provided with cavity The periphery of core is arranged with primary wires group；Secondary wire group is additionally provided with outside cavity, secondary wire group includes：Two first bronze medals Row, two second copper bars, two groups of power MOSFET tubes, two groups of MOSFET pipe busbars, one end of two first copper bars with Hollow cylinder is connected, and two one end of second copper bar are connected with transformer center bar, wherein an other end for the first copper bar The other end with wherein second copper bar is connected, and two groups of MOSFET pipe busbars are stacked；

Two groups of power MOSFET tubes and two groups of MOSFET pipes busbars are corresponded, the S poles pin of power MOSFET tube with The S poles welding copper bus of MOSFET pipe busbars, the D poles pin of power MOSFET tube and the D poles welding copper bus of MOSFET pipe busbars, work( The G poles pin of rate MOSFET pipes is welded with the Copper Foil of driver circuit plate in MOSFET pipe busbars；The D poles copper bar of MOSFET pipe busbars Also it is connected with wherein one copper bar.

Preferably, the Copper Foil of the S poles copper bar, D poles copper bar and driver circuit plate of MOSFET pipes busbar is cascading, and The first dielectric film is provided between the S poles copper bar and D poles copper bar, the second dielectric film is provided between D poles copper bar and Copper Foil.

Preferably, also including positive pole radiator and negative pole radiator, positive pole radiator and negative pole radiator are by insulation Fixed column is fixed with transformer shell, and the S poles copper bar of two groups of MOSFET pipe busbars is connected with negative pole radiator.

Preferably, the 3rd dielectric film, negative pole radiator and change are provided between positive pole radiator and the cavity of transformer shell The 4th dielectric film is provided between the cavity of depressor housing.

Preferably, it is also filled with silica gel in the cavity.

Preferably, wherein an other end for the first copper bar is connected the center of being formed with the other end of wherein second copper bar Tap.

Preferably, the 5th dielectric film is provided between the inwall of hollow cylinder and transformer center bar.

Compared to existing technology, the beneficial effects of the utility model are：

The structure that the utility model is provided is easy to modularization, current-carrying capacity big, power MOSFET tube and two groups of MOSFE pipe busbars The rectification output of composition is stacked, and distributed inductance is small, impedance is low, and interference free performance is good, whole inside transformer compact conformation, Closed magnetic circuit is formed, externally disturbs small, Electro Magnetic Compatibility is good；Copper bar area is larger, can play good radiating effect.

Brief description of the drawings

Fig. 1 is the of the present utility model kind of structure sectional view of low-voltage, high-current synchronous rectification transformer；

Fig. 2 is power MOSFET tube of the present utility model, the structure chart of MOSFET pipe busbars；

Fig. 3 is the sectional view of MOSFET pipes busbar of the present utility model.

In figure：10th, transformer center bar；11st, transformer shell；20th, annular core；30th, primary wires group；40a, first Copper bar；40b, the first copper bar；50a, the second copper bar；50b, the second copper bar；60a, power MOSFET tube；60b, power MOSFET Pipe；701a, S pole copper bar；701b, S pole copper bar；702a, D pole copper bar；702b, D pole copper bar；703a, Copper Foil；704b, Copper Foil； 80th, positive pole radiator；90th, negative pole radiator；100th, insulate fixed column；110a, the first dielectric film；110b, the first dielectric film； 120a, the second dielectric film；120b, the second dielectric film；130th, silica gel；140th, power model；150th, the 3rd dielectric film；160th, the 4th Dielectric film；170th, the 5th dielectric film.

Specific embodiment

Below, with reference to accompanying drawing and specific embodiment, the utility model is described further：

Referring to Fig. 1 to Fig. 3, the utility model provides a kind of low-voltage, high-current synchronous rectification transformer, including in transformer There is a cavity in axle 10, transformer shell 11, transformer shell 11, be groove, transformer equivalent to transformer shell 11 The profile of housing 11 can be cube, and the shape of its cavity can be cylindric.The top of cavity has opening, is provided with cavity One hollow cylinder, specifically, the hollow cylinder can be arranged on the centre position of cavity, the shape of hollow cylinder can be cylinder Body.Transformer center bar 10 is fixed in the hollow cylinder；Annular core 20 is additionally provided with cavity, the periphery of annular core 20 is It is arranged with primary wires group 30.In the utility model, primary wires group 30 is made up of some copper conductors, and these copper conductors are uniform Around the outer ring for being located at annular core 20, the primary wires group 30 of N circles is formed.

Secondary wire group is additionally provided with outside cavity, secondary wire group includes：Two first copper bar 40a, 40b, two second bronze medals Row 50a, 50b, two groups of power MOSFET tube 60a, 60b, two groups of MOSFET pipe busbars.Two first one end of copper bar 40a, 40b It is connected with hollow cylinder, two second one end of copper bar 50a, 50b are connected with transformer center bar 10, the first copper bar 40a The other end be connected with the other end of the second copper bar 50b, two groups of MOSFET pipe busbars are stacked, one group of MOSFET pipes busbar position In lower section, another group of MOSFET pipe busbar is layered on the MOSFET pipe busbars of lower section, can between two groups of MOSFET pipe busbars To paste fixation, it is ensured that do not loosen for a long time.Using stepped construction there is small distributed inductance, Low ESR, easy to assembly, circuit to damage The advantages of consuming small.In Fig. 1, a is the initial end of primary wires group 30, and b is the end of primary wires group 30, the initial end and end End is connected in parallel.First copper bar 40a, 40b is the output end copper coin of transformer shell 11, and second copper bar 50a, 50b is transformer The copper coin of center bar 10.Secondary wire group constitutes the conductor group of two circles, is connected in parallel between conductor group.Wherein one first copper bar The other end of 40b is connected to form centre cap with the other end of a wherein second copper bar 50a.

One group of MOSFET pipes busbar includes S poles copper bar 701a, D poles copper bar 702a and driver circuit plate that are cascading Copper Foil 703a, another group of MOSFET pipes busbar include S poles copper bar 701b, D poles copper bar 702b and the driving that are cascading The Copper Foil 703b of wiring board, is provided with the first dielectric film 110a, D poles copper bars 702a between S poles copper bar 701a and D poles copper bars 702a The second dielectric film 120a is provided between Copper Foil 703a.First dielectric film 110a and the second dielectric film 120b are each configured to have and glue Property dielectric film, convenient fixation between layers.Similarly, it is provided with the first insulation between S poles copper bar 701b and D poles copper bars 702b The second dielectric film 120b is provided between film 110b, D poles copper bar 702b and Copper Foil 703b.Two groups of power MOSFET tubes 60a, 60b and Two groups of MOSFET pipes busbars are corresponded, and the S poles pin of one of which power MOSFET tube 60a is female with one of which MOSFET pipes The S poles copper bar 701a welding of row, D poles pin and this group of D poles copper bar 702a welding of MOSFET pipe busbars, G poles pin and the group The Copper Foil 703a welding of driver circuit plate in MOSFET pipe busbars；Another group of S poles pin of power MOSFET tube 60b with another group The S poles copper bar 701b welding of MOSFET pipe busbars, D poles pin and this group of D poles copper bar 702b welding of MOSFET pipe busbars, G poles Pin is welded with the Copper Foil 703b of driver circuit plate in this group of MOSFET pipe busbar；The D poles copper bars 702a of MOSFET pipe busbars, 702b is also connected with wherein one first copper bar 40b.Two groups of each pins of power MOSFET tube 60 are welded with MOSFET pipes busbar Connect, collectively form the stepped construction being close to.

As improvement, also including positive pole radiator 80 and negative pole radiator 90, positive pole radiator 80 and negative pole radiator 90 In the opposite sides of transformer shell 11, positive pole radiator 80 and negative pole radiator 90 are by the fixed column 100 that insulate Fixed with transformer shell 11, and S poles copper bar 701a, 701b of two groups of MOSFET pipe busbars are connected with negative pole radiator 90. A power model 140 can be also installed on positive pole radiator 80 in addition.The output of power model 140 is defeated with primary wires group 30 Go out to be connected, positive pole radiator 80 and negative pole radiator 90 then as the outlet terminal of secondary wire group, wherein, positive pole radiator 80 is the centre cap of secondary wire group, that is, wherein one other end of the first copper bar 40 and wherein one second copper bar 50 The other end be commonly connected to positive pole radiator 80, and negative pole radiator 90 is public for the S poles work(of power MOSFET tube 60a, 60b End.

Be provided with the 3rd dielectric film 150 between the cavity of positive pole radiator 80 and transformer shell 11, negative pole radiator 90 with The hollow cylinder of the 4th dielectric film 160, transformer center bar 10 and transformer shell 11 is provided between the cavity of transformer shell Inwall between be provided with the 5th dielectric film 170, the setting of the above dielectric film can increase insulation effect, further insulation Isolation.

Transformer shell 11 is aluminium casting, and silica gel 130 is also filled with cavity, and silica gel 130 is potted in secondary wire group Inside, space is completely filled, and plays a part of fixed, increase intensity, while be further dielectrically separated from, reduce noise, and Heat conduction is uniform, and radiating effect is more preferable.

It will be apparent to those skilled in the art that technical scheme that can be as described above and design, make other various It is corresponding to change and deformation, and all these change and deformation should all belong to the protection of the utility model claim Within the scope of.

Claims (7)

1. a kind of low-voltage, high-current synchronous rectification transformer, it is characterised in that including transformer shell, transformer center bar, becomes There is a cavity, cavity open top is provided with a hollow cylinder in cavity, the transformer center bar is fixed on this in depressor housing In hollow cylinder；Annular core is additionally provided with cavity, the periphery of annular core is arranged with primary wires group；Cavity is additionally provided with outward Secondary wire group, secondary wire group includes：Two first copper bars, two second copper bars, two groups of power MOSFET tubes, two groups MOSFET pipe busbars, one end of two first copper bars is connected with hollow cylinder, two one end of second copper bar with change Depressor center bar is connected, wherein an other end for the first copper bar is connected with the other end of wherein second copper bar, two groups MOSFET pipe busbars are stacked；

Two groups of power MOSFET tubes and two groups of MOSFET pipes busbars are corresponded, the S poles pin and MOSFET of power MOSFET tube The S poles welding copper bus of pipe busbar, the D poles pin of power MOSFET tube and the D poles welding copper bus of MOSFET pipe busbars, power The G poles pin of MOSFET pipes is welded with the Copper Foil of driver circuit plate in MOSFET pipe busbars；The D poles copper bar of MOSFET pipe busbars is also It is connected with wherein one copper bar.

2. low-voltage, high-current synchronous rectification transformer as claimed in claim 1, it is characterised in that the S poles of MOSFET pipe busbars The Copper Foil of copper bar, D poles copper bar and driver circuit plate is cascading, and it is exhausted to be provided with first between the S poles copper bar and D poles copper bar Velum, is provided with the second dielectric film between D poles copper bar and Copper Foil.

3. low-voltage, high-current synchronous rectification transformer as claimed in claim 1, it is characterised in that also including positive pole radiator and Negative pole radiator, positive pole radiator and negative pole radiator are fixed by the fixed column that insulate with transformer shell, and two groups The S poles copper bar of MOSFET pipe busbars is connected with negative pole radiator.

4. low-voltage, high-current synchronous rectification transformer as claimed in claim 3, it is characterised in that positive pole radiator and transformer The 3rd dielectric film is provided between the cavity of housing, the 4th dielectric film is provided between negative pole radiator and the cavity of transformer shell.

5. low-voltage, high-current synchronous rectification transformer as claimed in claim 1, it is characterised in that be also filled with the cavity Silica gel.

6. low-voltage, high-current synchronous rectification transformer as claimed in claim 1, it is characterised in that wherein one first copper bar The other end is connected to form centre cap with the other end of wherein second copper bar.

7. low-voltage, high-current synchronous rectification transformer as claimed in claim 1, it is characterised in that the inwall of hollow cylinder with become The 5th dielectric film is provided between depressor center bar.