CN202855504U

CN202855504U - Modified sandwich winding transformer

Info

Publication number: CN202855504U
Application number: CN 201220445110
Authority: CN
Inventors: 廖桂林
Original assignee: (fujian) Electronic Co Ltd
Current assignee: (fujian) Electronic Co Ltd
Priority date: 2012-09-03
Filing date: 2012-09-03
Publication date: 2013-04-03
Anticipated expiration: 2022-09-03

Abstract

The utility model discloses a modified sandwich winding transformer which comprises a magnet core, a primary winding set and a secondary winding set, wherein the primary winding set comprises a first primary winding set and a second primary winding set, and the first primary winding set, the secondary winding set and the second primary winding set adopt a sandwich winding method. The first primary winding set, the secondary winding set and the second primary winding set are wound on a skeleton wire groove of the transformer in a single-layer flat-laying mode through adoption of the even and complete winding method. The modified sandwich winding transformer enables all the winding sets to reach a best coupling degree, and therefore leakage inductance is reduced to the lowest extent, and entire machine efficiency is improved to the maximum. Further, a 0.9-coil shielding winding set can be arranged outside the primary winding set with a large interference source, and a 1.1-coil shielding winding set is arranged outside of the magnet core. The 0.9-coil shielding winding set and the 1.1-coil shielding winding set are both connected with a ground wire of the first primary winding set so as to play a role of shielding of interference signals generated from the entire machine.

Description

A kind of modified model sandwich winding transformer

Technical field

The utility model relates to the transformer technology field, specifically refers to a kind of modified model sandwich winding transformer.

Background technology

Traditional transformer winding winding is the inside and outside winding of secondary winding N5 and armature winding N1, and as shown in Figure 1, wherein secondary winding N5 is just following and just grade coupled, and the degree of coupling is not high, thereby leakage inductance is larger, and then the overall efficiency reduction, does not reach the optimal pressure swing effect.A kind of sandwich winding has appearred thus, wherein with the armature winding dimidiation, half is around ragged edge, half is around the inside, middle coiling secondary winding, this winding method, so that all there is coupling the top and bottom of secondary winding with armature winding, the degree of coupling increases, and leakage inductance reduces, and overall efficiency increases.Yet, the tightness of described two winding coupled of sandwich winding is relevant with the winding method of winding in the transformer framework wire casing, at present more random distribution coiling (a kind of winding that for example provides among Fig. 2 is the winding method of layer mostly) can't reach the maximization of coupling, therefore still have the space that promotes leakage inductance and overall efficiency.Have, whole transformer comprises that each winding and magnetic core all are to be operated under the high frequency condition, can produce very large interference signal again, and sandwich winding transformer is not taked any measure that can shield described interference signal at present.

In view of this, the inventor conducts in-depth research for the problem that existing sandwich winding transformer exists, and this case produces thus.

The utility model content

A purpose of the present utility model is to provide a kind of modified model sandwich winding transformer, and it makes and reaches maximized coupling between each winding, realizes reducing to greatest extent the advantages such as leakage inductance, raising overall efficiency.

Another purpose of the present utility model is to provide a kind of modified model sandwich winding transformer, and it has the function that interference signal that complete machine is produced shields.

In order to reach above-mentioned purpose, solution of the present utility model is:

A kind of modified model sandwich winding transformer mainly comprises magnetic core, armature winding and secondary winding, and this armature winding comprises the first armature winding and the second armature winding, and above-mentioned the first armature winding, secondary winding and the second armature winding adopt sandwich winding; Described the first armature winding, secondary winding and the second armature winding are all taked on the skeleton wire casing of transformer evenly around full mode individual layer tiling coiling.

Above-mentioned armature winding is outside equipped with the shielding winding of 0.9 circle, and this shielding winding is connected with the ground wire of armature winding.

Above-mentioned magnetic core is outside equipped with the shielding winding of 1.1 circles, and this shielding winding is connected with the ground wire of armature winding.

Above-mentioned shielding winding is winding shielding or copper sheet shielding.

After adopting such scheme, a kind of modified model sandwich winding transformer of the utility model, its winding is taked the sandwich winding coiling, especially, each winding is all taked on the skeleton wire casing of transformer evenly around full mode individual layer tiling coiling, namely winding on wire casing just evenly tiling around full, thus so that reach the Best Coupling degree between each winding, leakage inductance is dropped to minimum, improve to greatest extent overall efficiency; Have again, this case transformer can also set to 0 at the larger armature winding peripheral hardware of interference source the shielding winding of .9 circle, this shielding winding is received on the ground wire of armature winding, makes the interference signal of a part receive elementary ground by the shielding winding, and the interference signal that thus complete machine is produced has played shielding action; Further, the shielding winding of 1.1 circles can also be set outside magnetic core, it is received on the ground wire of armature winding equally, makes most interference signal filtering to ground, and the interference signal that equally complete machine is produced has played further shielding action.

Description of drawings

Fig. 1 is the cross sectional representation of traditional transformer winding winding;

Fig. 2 is the mostly cross sectional representation of the winding method of layer of traditional winding;

Fig. 3 is the cross sectional representation of this sandwich Transformer Winding winding;

Fig. 4 is this novel schematic diagram that shields winding that adds;

Fig. 5 is cross sectional representation corresponding to Fig. 4;

Fig. 6 is this novel interference signal simulation curve figure that adds behind the shielding measure;

Fig. 7 is the interference signal simulation curve figure that tradition does not add shielding measure;

Fig. 8 is the schematic diagram of EMI and input rectifying filter circuit;

Fig. 9 is the schematic diagram of PMW control operating circuit.

Embodiment

In order further to explain the technical solution of the utility model, the utility model is elaborated below by specific embodiment.

In Switching Power Supply, transformer is an indispensable circuit devcie wherein, below simply first set forth EMI and the input rectifying filter circuit that is applied in the Switching Power Supply, and PWM control operating circuit.

Be a kind of EMI and input rectifying filter circuit referring to Fig. 8, wherein capacitor C 1F, C5FA, C18F and common mode inductance LF2F suppress the effect of EMI common mode disturbances; Capacitor C 4F suppresses the effect of EMI differential mode interference; Because requiring to be provided with resistance R 1F, R2F, R3F and R4F, safety when shutting down, discharges to capacitor C 4F; TH1F reduces complete machine starting current (complete machine being damaged to some extent because capacitor C 3F can cause at the short-circuiting effect of starting moment that starting current is excessive); Rectifier bridge D6F-D9F and C3F form current rectifying and wave filtering circuit provides DC power supply to complete machine.

Be a kind of PWM control operating circuit referring to Fig. 9, wherein the VCC pin (PIN5) of control chip IC1F obtains startup power supply by resistance R 7F and R8F and charges to capacitor C 6F, control chip IC1F starts working when capacitor C 7 voltages rise to the desired starting voltage of control chip IC1F, the high level of OUT pin (PIN6) the beginning output switch pulse of control chip IC1F, switching tube Q1F enters conducting state.The armature winding (1 to 3 pin) of direct voltage on the capacitor C 3F by transformer T1F-switching tube-R6F consists of the loop.The at this moment linear increase of electric current in the transformer T1F armature winding, when this electric current increase reaches certain value (this magnitude of voltage is that the inner setting of control chip IC1F own is good) after the integrating circuit filtering spike that the voltage that resistance R 6F produces forms by resistance R 10F and capacitor C 20F disturbs, CS pin (PIN4) input by control chip IC1, the OUT pin of control chip IC1F begins the low level of output switch pulse, switching tube Q1F enters cut-off state, output winding 1(7 pin to 8 pin), output winding 2 (9 pin to 10 pin), auxiliary winding (5 pin to 6 pin) begins output voltage by the rectifier diode of separately conducting, auxiliary winding begins by the effect of resistance R 12F(trim voltage) to diode D3F commutation capacitor C6F filtering, capacitor C 5F decoupling is powered to control chip IC1F; The armature winding of switching tube cut-off this moment T1 will produce peak voltage, is operated in D1F in the safe voltage scope in order to guarantee switching tube Q1F, and resistance R 5F and capacitor C 50F just are used for absorbing this peak voltage.Switching tube Q1F, resistance R 52F accelerate the switching tube Q1F effect of deadline, to reduce switching loss, improve overall efficiency.

Output winding 1 is by diode D5FA rectification, and capacitor C 20F filtering is filtered into clean 12V direct voltage by capacitor C 16F behind the inductance L 1F filtering high frequency spike ripple again; Output winding 2 is by diode D4FA rectification, and capacitor C 11F filtering is filtered into clean 5V direct voltage by capacitor C 12F behind the inductance L 2F filtering high frequency spike ripple again.Resistance R 16F, R19F and control chip IC2F form sample circuit, and capacitor C 9F and resistance R 18F are the compensating circuit negative-feedback circuits namely of control chip IC2F, improve the stability of control chip IC2F.The work-based logic principle is as follows: when load current diminishes, output voltage uprises, when sample circuit detects output voltage and uprises, control chip IC2F can make the electric current among the PC1FB become large, the PC1FA resistance diminishes, the COMP(PIN2 of control chip IC1F) pin voltage drop shortens the high level time of the OUT pin output switch pulse of control chip IC1F, thereby the ON time of adjusting switching tube Q1F makes output voltage decline reach the voltage that sets.When load current becomes large, the output voltage step-down, on the contrary logical relation gets final product.

This novel transformer of using in the main Switching Power Supply that relates to, referring to Fig. 3, mainly comprise magnetic core, armature winding and secondary winding N3, described armature winding comprises the first armature winding N1 and the second armature winding N5, and this first armature winding N1, secondary winding N3 and the second armature winding N5 adopt sandwich winding; Especially, described the first armature winding N1, secondary winding N3 and the second armature winding N5 all take on the skeleton wire casing of transformer evenly around the lucky individual layer tiling of full mode coiling, do not have more, quite a few (cause around discontented) actually needs conscientiously to carry out repeatedly sample debugging experiment in to transformer parameters designing the time and reaches described effect.Described winding method makes leakage inductance drop to minimum so that reach the Best Coupling degree between each winding thus, improves to greatest extent overall efficiency.

Have, solving electromagnetic interference generally has three kinds of approach again, and the one, the intensity of reduction interference source, the 2nd, the antijamming capability of the driven metal-oxide-semiconductor of enhancing, the 3rd, intercept the path that disturbs.In this programme, interference source is exactly the interference signal that transformer produces under high frequency, adopts the first approach to reach the purpose that reduces interference source intensity by reducing transformer leakage inductance.Adopt the third approach, can by between the winding of transformer and magnetic core add the path that screen intercepts interference signal.Shown in Fig. 4-5, described armature winding is outside equipped with the shielding winding E1 of 0.9 circle thus, and this shielding winding E1 is connected with the ground wire (No. 3 lines) of armature winding.Because armature winding is driven by switching pulse signal, be operated under the high-frequency state, power is also large simultaneously, consequent interference signal is also large, this moment is with the 0.9 shielding winding E1 that encloses and receive the ground of armature winding, just the interference signal of a part has been received the ground of armature winding by shielding winding E1, the interference signal that like this complete machine is produced has also just played shielding action.Described take 0.9 the circle inner shield be because this screen be equivalent to a winding, can not cause under the short circuit prerequisite (if more than 1.0 circles not linking to each other, meeting so from beginning to end causes short circuit, namely be equivalent to a short circuit in winding in the transformer, so whole transformer just can not worked), also reached preferably shielding action simultaneously.

Further, shown in Fig. 4-5, described magnetic core is outside equipped with the shielding winding E2 of 1.1 circles, and this shielding winding E2 is connected with the ground wire (No. 3 lines) of armature winding.Whole transformer comprises that each winding and magnetic core all are to be operated under the high frequency, can produce very large interference signal, so magnetic core adds the ground that the shielding winding E2 of 1.1 circles connects armature winding outward again, like this will be most interference signal filtering to ground, the interference signal that like this complete machine is produced has just played further shielding action.Described 1.1 circle external shields are that the interference signal that transformer produces is shorted to ground, because this shielding is to be added in outside the magnetic core, different from winding in the top transformer, the above headtotail short circuit of 1.0 circles can not affect whole transformer normal operation, and shield effectiveness is more excellent.

Described shielding winding E1, E2 all can be winding shielding or copper sheet shielding, the coiling schematic diagram of each winding of transformer is referring to Fig. 4, cross-sectional view wherein also is provided with elementary auxiliary winding N4 for armature winding referring to Fig. 5, also is provided with secondary auxiliary winding N2 for secondary winding.Fig. 6, Fig. 7 have provided respectively interference signal simulation curve figure corresponding when adding shielding and not adding shielding, can draw by contrast, and this novel described shielding winding plays effective shielding function to interference signal.

Above-described embodiment and graphic and non-limiting product form of the present utility model and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present utility model to its suitable variation or modification of doing.

Claims

1. a modified model sandwich winding transformer mainly comprises magnetic core, armature winding and secondary winding, and this armature winding comprises the first armature winding and the second armature winding, and above-mentioned the first armature winding, secondary winding and the second armature winding adopt sandwich winding; It is characterized in that: described the first armature winding, secondary winding and the second armature winding are all taked on the skeleton wire casing of transformer evenly around full mode individual layer tiling coiling.

2. a kind of modified model sandwich winding transformer as claimed in claim 1 is characterized in that: above-mentioned armature winding is outside equipped with the shielding winding of 0.9 circle, and this shielding winding is connected with the ground wire of armature winding.

3. a kind of modified model sandwich winding transformer as claimed in claim 1 or 2 is characterized in that: above-mentioned magnetic core is outside equipped with the shielding windings of 1.1 circles, and this shielding winding is connected with the ground wire of armature winding.

4. a kind of modified model sandwich winding transformer as claimed in claim 3 is characterized in that: above-mentioned shielding winding is winding shielding or copper sheet shielding.