CN201243409Y

CN201243409Y - Fixed welded structure of transformer on printed circuit board

Info

Publication number: CN201243409Y
Application number: CNU2008201507615U
Authority: CN
Inventors: 杨建文; 倪雪云
Original assignee: SHANGHAI ARCATA ELECTRONIC Inc
Current assignee: SHANGHAI ARCATA ELECTRONIC Inc
Priority date: 2008-07-11
Filing date: 2008-07-11
Publication date: 2009-05-20
Anticipated expiration: 2018-07-11

Abstract

A fixing and welding structure for fixing and welding a transformer on a printed circuit board comprises a transformer pin, a single-side printed circuit board, a via hole for inserting the transformer pin, and a bonding pad surrounding the via hole. The transformer pin runs through the via hole on the printed circuit board and then bends for 90 degrees and is wrapped and fixedly connected through soldering tin with the bonding pad on the welding surface of the printed circuit board; or a solenoid leading-out wire of the transformer is wound densely from the root of the transformer pin to the tip of the pin. The transformer pin runs through the via hole on the printed circuit board and is wrapped and fixedly connected through soldering tin with the bonding pad on the welding surface of the printed circuit board. Compared with prior art, the period times of cold-heat impact tests to cause the bonding pad to have cracks and other abnormal occurrences are remarkably increased by almost one time, reaching the effect of a printed circuit board whose via hole is metallized. Therefore, the fixing and welding structure can reduce product cost while maintaining the performance reliability of the product for a long time.

Description

The fixedly Welding Structure of transformer on printed circuit board

[technical field]

The utility model relates to the Welding Structure of a kind of electronic device on printed circuit board, particularly the Welding Structure of transformer on printed circuit board.

[background technology]

Be welded on the pin of drawing from coil frame of iron core on the printed circuit board or ferrite core transformer, generally adopt three kinds of modes of Fig. 1, Fig. 2 and Fig. 3.Fig. 1 and Fig. 2 are pin radially, and pin is vertical with the printed circuit board solder side.The line bag lead-out wire boxing of transformer is at the root of pin among Fig. 1, the pin of this transformer framework since root weld line bag lead-in wire and can not all being inserted in the via hole of printed circuit board pad, therefore raised the height of transformer.The line bag lead-out wire boxing of transformer is at the side elongated end of pin among Fig. 2, thereby the horizontal occupy-place broad of transformer.The pin of transformer is parallel with printed circuit board among Fig. 3, and pin length closely contacts with pad, has more scolding tin that pin is wrapped up after welding, and its quality of welding on pad is better than aforementioned two kinds of structures.But this transformer area occupied on printed circuit board is excessive, and does not have printed circuit board again for hollow out below the transformer, like this, has limited wiring and application on printed circuit board below the transformer.

Some electronic product special as electric ballast in, the area of printed circuit board and whole height are all restricted; And output transformer wherein, the very high device of heating temp when being a job again, temperature difference when operate as normal and shutdown is very big, scolding tin between transformer pin and the single-clad board easily cracks phenomenon behind long-term thermal shock, referring to Fig. 4, therefore must manage to improve the welding quality of transformer pin on printed circuit board, with the reliability of the long-term work that guarantees product.At present, to adopting Fig. 1 and the welded transformer of Fig. 2 pin, adopt the printed circuit board of pad via metal processing usually, in the prior art referring to Fig. 5, the welding quality of high heating part pin pad during with work such as assurance transformers, but its cost will increase substantially.

[summary of the invention]

Technical problem to be solved in the utility model is to overcome existing defective in the above-mentioned prior art, provide a kind of and can adopt lower-cost common single-clad board, can improve the fixedly Welding Structure of transformer on printed circuit board that is in the electronic product that uses under the cold and hot temperature difference great disparity condition for a long time again.

The utility model has adopted following technical proposals to solve the technical problem of its existence: the fixedly Welding Structure of a kind of transformer on printed circuit board, comprise the transformer pin, single-clad board, be equipped with on the printed circuit board for the via hole that inserts the transformer pin, and the pad that around via hole, constitutes by the printed circuit board solder side, it is characterized in that: the transformer pin passes on the printed circuit board bending 90 degree behind the via hole, and with the pad of printed circuit board solder side through the scolding tin parcel and fixedly connected, perhaps the line bag lead-out wire of transformer closely twines until the pin end from the pin root always, this transformer pin passes the via hole on the printed circuit board, and fixedlys connected through the scolding tin parcel with the pad of printed circuit board solder side.

Compare in the utility model and the prior art, after it stands cold shock testing, pad begins to occur the cold shock testing cycle times of anomalies such as crackle, obviously improves one times nearly, reaches or the approaching effect that adopts via metal processing printed circuit.Therefore, the utility model can keep the reliability of product long-term work when reducing product cost.

[description of drawings]

Fig. 1 is the structural representation that the boxing of prior art center line bag lead-out wire is fixedlyed connected with printed circuit board at the pin root;

Fig. 2 is the structural representation that the boxing of prior art center line bag lead-out wire is fixedlyed connected with printed circuit board at the side elongated end of pin;

The structural representation that Fig. 3 be arranged in parallel and fixedlys connected with printed circuit board for pin in the prior art;

Fig. 4 easily cracks the schematic diagram of phenomenon behind long-term thermal shock for the scolding tin between transformer pin in the prior art and the single-clad board;

The structural representation of fixedlying connected between Fig. 5 crosses the aperture metalized for pad in the prior art printed circuit board and the transformer pin;

Fig. 6 passes the structural representation of fixedlying connected through the scolding tin parcel with pad after the bending of printed circuit board via hole for the utility model transformer pin;

Fig. 7 for the utility model transformer line bag lead-out wire from the pin root around to terminal and pass the printed circuit board via hole and wrap up the structural representation of fixedlying connected through scolding tin with pad;

Fig. 8 is the utility model embodiment 1 structural representation;

Fig. 9 is the utility model embodiment 2 structural representations;

Figure 10 is the utility model embodiment 3 structural representations;

Figure 11 is via hole center and a pad center position deviation schematic diagram on the printed circuit board in the utility model.

Each sequence number is expressed as respectively among the figure:

1-single-clad board, 2-via hole

3-transformer, 4-pin

5-pad, 6-scolding tin

7-line bag lead-out wire

[embodiment]

The utility model will be further described below in conjunction with embodiment and accompanying drawing.

With reference to accompanying drawing, the utility model comprises transformer 3 and its pin 4, and single-clad board 1 is equipped with on the printed circuit board 1 for the via hole 2 that inserts transformer pin 4, and the pad 5 around the via hole on printed circuit board 1 solder side 2.

With reference to Fig. 6, the utility model transformer pin 4 passes via hole 2 back bendings 90 degree on the printed circuit board 1, and fixedlys connected through scolding tin 6 parcels with the pad 5 of printed circuit board 1 solder side.The utility model is through after the wave-soldering, and being close to pad 5 through the transformer pin 4 of 90 degree bendings because of whole length has bigger solder side.

With reference to Fig. 7, perhaps the line bag lead-out wire 7 of the utility model transformer 3 closely twines until pin 4 ends from pin 4 roots always, this transformer pin 4 passes via hole 2 on the printed circuit board 1, and fixedlys connected through scolding tin 6 parcels with the pad 5 of printed circuit board 1 solder side.On this pin 4, except having the normal scolding tin 6 between the pin 4 of solder side and pad 5, scolding tin 6 also can be climbed to pin 4 roots along the line bag lead-out wire 7 on pin 4 always, forms bigger, a more complete solder side.

With reference to Fig. 8, among the utility model embodiment 1, the pin 4 of transformer 3 one sides passes via hole 2 back bendings 90 degree on the printed circuit board 1, and with the pad 5 of printed circuit board 1 solder side through scolding tin 6 parcels and fixedly connected, pin 4 its line bag lead-out wires 7 of transformer 3 opposite sides closely twine until pin 4 ends from pin 4 roots always, and this side pin 4 passes on the printed circuit board 1 via hole 2 backs and pad 5 and wraps up and fixedly connected through scolding tin 6.If the line bag is a multi cord, then must earlier knob each strand together be loosed off, flat again around and be welded on the whole pin 4.

With reference to Fig. 9, among the utility model embodiment 2, the line bag lead-out wire 7 of transformer 3 all pins 4 closely twines until pin 4 ends from pin 4 roots always, and described pin 4 passes on the printed circuit board 1 via hole 2 backs and pad 5 and wraps up and fixedly connected through scolding tin 6.If the line bag is a multi cord, must earlier knob each strand together be loosed off, flat again around and be welded on the whole pin 4.

With reference to Figure 10, among the utility model embodiment 3, transformer 3 all pins 4 pass on the printed circuit board 1 via hole 2 backs to a side bending 90 degree, and with the pad 5 of printed circuit board 1 solder side through scolding tin 6 parcels and fixedly connected.

With reference to Figure 11, in the utility model, bend printed circuit board 1 pad 5 of pin 4 of transformer 3 should be waist garden shape, and via hole 2 is to the opposite direction off-centre of bending, and promptly depart from mutually with printed circuit board 1 pad 5 centers the center of the via hole 2 that is inserted by transformer pin 4.So that after pin 4 welding bigger solder side is arranged.

In addition, on the printed circuit board 1 via hole 2 diameters of pad 5 greater than transformer pin 4 around pin 4 diameters of bag after the lead-out wire 7 of reaching the standard grade.

Adopt the Welding Structure described in the utility model, can increase the solder side of transformer pin 4, like this, both can save cost and don't reduce reliability of products with under the condition of single-clad board 1.

Claims

1, the fixedly Welding Structure of a kind of transformer on printed circuit board, comprise the transformer pin, single-clad board, be equipped with on the printed circuit board for the via hole that inserts the transformer pin, and on the printed circuit board solder side pad around the via hole, it is characterized in that: the transformer pin passes on the printed circuit board bending 90 degree behind the via hole, and with the pad of printed circuit board solder side through the scolding tin parcel and fixedly connected, perhaps the line bag lead-out wire of transformer closely twines until the pin end from the pin root always, this transformer pin passes via hole on the printed circuit board, and fixedlys connected through the scolding tin parcel with the pad of printed circuit board solder side.

2, the fixedly Welding Structure of transformer according to claim 1 on printed circuit board, it is characterized in that: the pin of transformer one side passes on the printed circuit board bending 90 degree behind the via hole, and with the pad of printed circuit board solder side through the scolding tin parcel and fixedly connected, its line bag lead-out wire of the pin of transformer opposite side closely twines until the pin end from the pin root always, and this side pin passes on the printed circuit board fixedlys connected through the scolding tin parcel with pad behind the via hole.

3, the fixedly Welding Structure of transformer according to claim 1 on printed circuit board, it is characterized in that: all pins of transformer pass on the printed circuit board behind the via hole to a side bending 90 degree, and with the pad of printed circuit board solder side through the scolding tin parcel and fixedly connected.

4, the fixedly Welding Structure of transformer according to claim 1 on printed circuit board, it is characterized in that: the line bag lead-out wire of all pins of transformer closely twines until the pin end from the pin root always, and described pin passes on the printed circuit board fixedlys connected through the scolding tin parcel with pad behind the via hole.

5, the fixedly Welding Structure of transformer according to claim 1 on printed circuit board is characterized in that: depart from mutually with printed circuit board pad center position the center of the via hole that is inserted by the transformer pin.

6, the fixedly Welding Structure on printed circuit board according to claim 1 or 2 or 4 described transformers is characterized in that: the via diameter of pad is greater than the leg diameter of transformer pin after the bag lead-in wire of reaching the standard grade on the printed circuit board.