CN216054235U

CN216054235U - Novel flyback multi-path accurate dynamic adjustment transformer

Info

Publication number: CN216054235U
Application number: CN202121547474.XU
Authority: CN
Inventors: 张征熊
Original assignee: Anhui Hengfu Electronic Technology Co ltd
Current assignee: Anhui Hengfu Electronic Technology Co ltd
Priority date: 2021-07-08
Filing date: 2021-07-08
Publication date: 2022-03-15
Anticipated expiration: 2031-07-08

Abstract

A novel flyback multipath accurate dynamic adjustment transformer comprises a bobbin, wherein two sides of the bobbin are respectively fixed with a baffle, the top surface of the baffle is provided with a pin group, the side wall of the bobbin is wound with a coil, and one side of the coil is electrically connected to one end of the pin group; the coil comprises a primary winding, a secondary winding and a feedback winding, the secondary winding is connected to one side of the primary winding in a winding mode in a fitting mode, and the feedback winding is arranged between the primary winding and the secondary winding. The primary winding and the secondary winding are connected in a winding mode in a fitting mode, the coupling degree between the windings can be enhanced, leakage inductance is reduced, the feedback winding is arranged between the primary winding and the secondary winding to separate the low-power windings in the secondary winding, accordingly, the leakage inductance is increased, different leakage inductances generated by the windings are achieved, the leakage inductance of the secondary winding can be dynamically balanced in actual exchange of the transformer, and accurate output is achieved.

Description

Novel flyback multi-path accurate dynamic adjustment transformer

Technical Field

The utility model belongs to the technical field of transformers, and particularly relates to a novel flyback multi-path accurate dynamic adjustment transformer.

Background

Along with the wide popularization and application of electronic products, the market demand is more and more large, because the products mostly adopt low-voltage direct current as a power supply, and because of the portable demand, a plurality of voltages with different outputs can be concentrated on one power supply, and the accuracy degree of the output voltage determines the performance index of the power supply. The load of each combination affects the output voltage variation. Therefore, a switching power supply is generally designed, and the multi-path transformer is a special key core component of the switching power supply. Its winding affects the characteristics of the multiple outputs.

To keep the output voltage within a specified error range, it is necessary to increase or decrease their number of turns or to adjust the output of the feedback winding. This necessarily increases the time to debug in order to keep all outputs within a certain error range. In many cases, it is often necessary to add additional linear or switching regulator circuits to solve the problem of the multiple output voltages failing to reach within a specified error due to the cross regulation.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides a novel flyback multipath accurate dynamic adjustment transformer, which has the following specific technical scheme:

a novel flyback multipath accurate dynamic adjustment transformer comprises a bobbin, wherein two sides of the bobbin are respectively fixed with a baffle, the top surface of the baffle is provided with a pin group, the side wall of the bobbin is wound with a coil, and one side of the coil is electrically connected to one end of the pin group;

the coil comprises a primary winding, a secondary winding and a feedback winding, the secondary winding is connected to one side of the primary winding in a winding mode in a fitting mode, and the feedback winding is arranged between the primary winding and the secondary winding.

Further, the stitch group includes first stitch, second stitch, third stitch, fourth stitch, fifth stitch, sixth stitch, seventh stitch, eighth stitch, ninth stitch, tenth stitch, eleventh stitch and twelfth stitch, first stitch, second stitch, third stitch, fourth stitch, fifth stitch, sixth stitch, seventh stitch, eighth stitch, ninth stitch, tenth stitch, eleventh stitch and twelfth stitch are all fixed in the baffle top surface, be connected with the feedback winding between first stitch and the second stitch, be connected with primary winding between third stitch, fourth stitch and the fifth stitch, be connected with secondary winding between sixth stitch, seventh stitch, eighth stitch, ninth stitch, tenth stitch, eleventh stitch and the twelfth stitch.

Further, primary winding includes first winding and second winding, first winding one side series connection has the second winding, first winding one end is connected in the third stitch, and the other end is connected in the fourth stitch, second winding one end is connected in the fourth stitch, and the other end is connected in the fifth stitch, first winding lateral wall is around having the feedback winding, the feedback winding lateral wall is around having the secondary winding, the secondary winding lateral wall is around having the second winding.

Furthermore, the feedback winding comprises a seventh winding, the seventh winding is wound on the side wall of the first winding, the side wall of the seventh winding is wound on the secondary winding, one end of the seventh winding is connected to the first pin, and the other end of the seventh winding is connected to the second pin.

Further, secondary winding includes third winding and fourth winding, third winding and fourth winding all around connect in the seventh winding lateral wall, third winding one end is connected in the seventh stitch, and the other end is connected in the eighth stitch, fourth winding one end is connected in the ninth stitch, and the other end is connected in the tenth stitch.

Further, the secondary winding still includes fifth winding and sixth winding, the fifth winding is around connecing in third winding and fourth winding lateral wall, the fifth winding lateral wall has been around connecing the sixth winding, the sixth winding lateral wall has been around connecing the second winding, fifth winding one end is connected in the sixth stitch, and the other end is connected in the twelfth stitch, sixth winding one end is connected in the ninth stitch, and the other end is connected in the eleventh stitch, sixth winding one side series connection has the fourth winding.

The utility model has the beneficial effects that: the primary winding and the secondary winding are connected in a winding mode in a fitting mode, the coupling degree between the windings can be enhanced, leakage inductance is reduced, a feedback winding is arranged between the primary winding and the secondary winding to separate small power windings in the secondary winding, accordingly, the leakage inductance is increased, the leakage inductance of the secondary winding can be dynamically balanced in actual exchange of the transformer through different leakage inductances generated by the windings, and accurate output is achieved.

Drawings

Fig. 1 shows a schematic diagram of the overall structure of a novel flyback multipath accurate dynamic regulation transformer of the present invention;

FIG. 2 shows a winding and pin connection circuit of the present invention;

FIG. 3 shows a cross-sectional view of a winding layer structure of the winding of the present invention;

shown in the figure: 1. a coil; 11. a primary winding; 111. a first winding; 112. a second winding; 12. A secondary winding; 121. a third winding; 122. a fourth winding; 123. a fifth winding; 124. a sixth winding; 13. a feedback winding; 131. a seventh winding; 2. a bobbin; 3. a baffle plate; 4. a pin group; 401. a first pin; 402. a second pin; 403. a third stitch; 404. a fourth pin; 405. A fifth pin; 406. a sixth stitch; 407. a seventh pin; 408. an eighth pin; 409. a ninth stitch; 410. a tenth pin; 411. an eleventh stitch; 412. and a twelfth stitch.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

A novel flyback multipath accurate dynamic adjustment transformer comprises a bobbin 2, wherein two sides of the bobbin 2 are respectively fixed with a baffle 3, the top surface of the baffle 3 is provided with a pin group 4, the side wall of the bobbin 2 is wound with a coil 1, and one side of the coil 1 is electrically connected with one end of the pin group 4;

the coil 1 comprises a primary winding 11, a secondary winding 12 and a feedback winding 13, wherein the secondary winding 12 is connected to one side of the primary winding 11 in a winding mode, and the feedback winding 13 is arranged between the primary winding 11 and the secondary winding 12; the primary winding and the secondary winding are connected in a winding mode in a fitting mode, the coupling degree between the windings can be enhanced, leakage inductance is reduced, a feedback winding is arranged between the primary winding and the secondary winding to separate small power windings in the secondary winding, accordingly, the leakage inductance is increased, the leakage inductance of the secondary winding can be dynamically balanced in actual exchange of the transformer through different leakage inductances generated by the windings, and accurate output is achieved.

As shown in fig. 1, the stitch group 4 includes a first stitch, a second stitch 402, a second stitch 403, a fourth stitch 404, a fifth stitch 405, a sixth stitch 406, a seventh stitch 407, an eighth stitch 408, a ninth stitch 409, a tenth stitch 410, an eleventh stitch 411, and a twelfth stitch 412, the first stitch, the second stitch 402, the third stitch 403, the fourth stitch 404, the fifth stitch 405, the sixth stitch 406, the seventh stitch 407, the eighth stitch 408, the ninth stitch 409, the tenth stitch 410, the eleventh stitch 411, and the twelfth stitch 412 are all fixed on the top surface of the baffle 3, a feedback winding 13 is connected between the first stitch and the second stitch 402, a primary winding 11 is connected between the third stitch 403, the fourth stitch 404, and the fifth stitch 405, the sixth stitch 406, the seventh stitch 407, the eighth stitch 408, the ninth stitch 409, the tenth stitch 410, and the twelfth stitch 412 are all fixed on the top surface of the baffle 3, a primary winding 11 is connected between the third stitch 403, the fourth stitch 404, the fifth stitch 405, and the sixth stitch 406, the seventh stitch 407, the eighth stitch 408, the ninth stitch 409, the ninth stitch 410, the ninth stitch 409, the tenth stitch 410, and the eighth stitch 405, A secondary winding 12 is connected between the eleventh pin 411 and the twelfth pin 412.

As shown in fig. 2 and 3, the primary winding 11 includes a first winding 111 and a second winding 112, the second winding 112 is connected in series on one side of the first winding 111, one end of the first winding 111 is connected to the third pin 403, the other end of the first winding is connected to the fourth pin 404, one end of the second winding 112 is connected to the fourth pin 404, the other end of the second winding is connected to the fifth pin 405, the feedback winding 13 is wound on the sidewall of the first winding 111, the secondary winding 12 is wound on the sidewall of the feedback winding 13, and the second winding 112 is wound on the sidewall of the secondary winding 12; the first winding and the second winding are connected in series in a coupling mode, so that voltage spikes caused by leakage inductance during the working of the transformer can be effectively reduced.

The feedback winding 13 includes a seventh winding 131, the seventh winding 131 is wound on the sidewall of the first winding 111, the sidewall of the seventh winding 131 is wound with the secondary winding 12, one end of the seventh winding 131 is connected to the first pin, and the other end of the seventh winding 131 is connected to the second pin 402.

The secondary winding 12 comprises a third winding 121 and a fourth winding 122, the third winding 121 and the fourth winding 122 are wound on the sidewall of the seventh winding 131, one end of the third winding 121 is connected to the seventh pin 407, the other end of the third winding is connected to the eighth pin 408, one end of the fourth winding 122 is connected to the ninth pin 409, and the other end of the fourth winding is connected to the tenth pin 410; the third winding and the fourth winding are wound on the same layer, namely a stacked winding method is adopted, so that the length of a lead can be saved, and the volume of a coil is reduced; and the amount of mutual inductance between the windings can be increased to enhance the degree of coupling.

The secondary winding 12 further comprises a fifth winding 123 and a sixth winding 124, the fifth winding 123 is wound on the side walls of the third winding 121 and the fourth winding 122, the sixth winding 124 is wound on the side wall of the fifth winding 123, the second winding 112 is wound on the side wall of the sixth winding 124, one end of the fifth winding 123 is connected to the sixth pin 406, the other end of the fifth winding is connected to the twelfth pin 412, one end of the sixth winding 124 is connected to the ninth pin 409, the other end of the sixth winding is connected to the eleventh pin 411, and the fourth winding 122 is connected in series on one side of the sixth winding 124; the fourth winding and the sixth winding are connected in series, so that voltage spikes caused by leakage inductance during the operation of the transformer can be effectively reduced.

In the practice of the present invention, the catalyst is,

designing a model HF100W-QEK four-way series (5V4A24V2.5A15V1A-15V1A) flyback switching power supply transformer;

1. designing parameters:

vin is 90VAC-300VAC, V1 is 5V, I1 is 0.5-4A, V2 is 24V, I2 is 0.25-2.5A, V3 is 15V, I3 is 0.3-1A, V4 is-15V, I4 is 0.3-1A, core EER3542S, Fsw is 65 KHZ.

2. Description of winding structure:

the novel flyback multi-path accurate dynamic adjustment transformer is of a special structure, a primary winding and a secondary winding are close to each other and are respectively and correspondingly connected with a pin group, the structure enhances the coupling degree and reduces the generation of leakage inductance; the first winding of the primary winding and the third winding and the fourth winding of the secondary winding with low power are separated by the feedback winding, so that the generation of leakage inductance is increased;

the third winding and the fourth winding adopt a stacking and winding way in the same winding layer to balance the leakage inductance of the third winding and the fourth winding. The leakage inductance generated by the windings at different positions is different, the leakage inductance of the secondary winding is dynamically balanced in the actual transformation of the transformer, and the leakage inductance of each winding is well adjusted and matched, so that the aim of accurately outputting the adjustment rate is fulfilled. The stacking winding method has advanced technology, not only can save wires and reduce the volume of a coil, but also can increase the mutual inductance among windings and strengthen the coupling degree;

taking the power supply as an example, when the output of the sixth winding is full, the sixth winding is taken as the starting end of the secondary winding, and the third winding, the fourth winding and the fifth winding output light loads, the leakage inductance of the windings can be reduced, so that the filter capacitors of the third winding, the fourth winding and the fifth winding in the output circuit can be prevented from being charged to the peak value by the peak voltage due to the leakage inductance, that is, the peak charging effect is avoided, and the stability of the output voltage is ensured.

3. Calculation of the number of turns:

for a multi-output high-frequency transformer, the number of turns of each output winding can be the same number of turns per volt. The number of turns per volt, nO, can be determined by: the unit is turn/VO, NS is 3 turns, UO1 ═ 5V, UF1 ═ 0.4V (schottky rectifier conduction voltage drop), and substituted into the above formula to obtain nO ═ 0.6 turn/V.

For 24V output of the fifth winding, if UO2 is 24V and UF2 is 1V, the number of turns of the output winding is NS2 is 0.6 turns/V × (24V + 0.6V) ═ 14.7 turns, and 14 turns are actually taken.

For the 15V output of the third winding, if UO3 is 15V and UF3 is 1V, the number of turns of the output winding is NS2 is 0.6 turns/V × (12V +1V) is 8.8 turns, and 9 turns are actually taken.

For the-15V output of the fourth winding, knowing that UO4 is 15V and UF4 is 1V, the number of turns of the output winding is NS2 is 0.6 turns/V × (12V +1V) 8.8 turns, and 9 turns are actually taken.

For the seventh winding of the feedback winding, if UF 12V and UF3 0.7V (conduction voltage drop of the silicon fast recovery rectifier diode) are known, the number of turns of the output winding is NS2 0.6 turns/vx (12V +0.4V) 6.1 turns, and 6 turns are obtained.

4. And (3) testing the cross regulation rate of the multi-path power supply:

the load current is set to five cases 1: no load, full load, half load, main road full load and minor road minimum load, and main road minimum load and minor road full load. The cross regulation rate of the output voltage is not more than 5 percent, namely the purpose of improvement is achieved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a novel flyback multichannel accurate dynamic adjustment transformer which characterized in that: the bobbin comprises a bobbin (2), wherein two sides of the bobbin (2) are respectively fixed with a baffle (3), the top surface of the baffle (3) is provided with a pin group (4), the side wall of the bobbin (2) is wound with a coil (1), and one side of the coil (1) is electrically connected with one end of the pin group (4);

the coil (1) comprises a primary winding (11), a secondary winding (12) and a feedback winding (13), wherein the secondary winding (12) is connected to one side of the primary winding (11) in a winding mode in a laminating mode, and the feedback winding (13) is arranged between the primary winding (11) and the secondary winding (12).

2. The novel flyback multipath accurate dynamic regulation transformer of claim 1, characterized in that: the pin group (4) comprises a first pin, a second pin (402), a third pin (403), a fourth pin (404), a fifth pin (405), a sixth pin (406), a seventh pin (407), an eighth pin (408), a ninth pin (409), a tenth pin (410), an eleventh pin (411) and a twelfth pin (412), the first pin, the second pin (402), the third pin (403), the fourth pin (404), the fifth pin (405), the sixth pin (406), the seventh pin (407), the eighth pin (408), the ninth pin (409), the tenth pin (410), the eleventh pin (411) and the twelfth pin (412) are all fixed on the top surface of the baffle (3), a feedback pin winding (13) is connected between the first pin and the second pin (402), and a primary winding (11) is connected between the third pin (403), the fourth pin (404) and the fifth pin (405), and a secondary winding (12) is connected among the sixth pin (406), the seventh pin (407), the eighth pin (408), the ninth pin (409), the tenth pin (410), the eleventh pin (411) and the twelfth pin (412).

3. The novel flyback multipath accurate dynamic regulation transformer of claim 2, characterized in that: primary winding (11) include first winding (111) and second winding (112), first winding (111) one side series connection has second winding (112), first winding (111) one end is connected in third stitch (403), and the other end is connected in fourth stitch (404), second winding (112) one end is connected in fourth stitch (404), and the other end is connected in fifth stitch (405), first winding (111) lateral wall is around having feedback winding (13), feedback winding (13) lateral wall has around having secondary winding (12), secondary winding (12) lateral wall has around having second winding (112).

4. The novel flyback multipath accurate dynamic regulation transformer of claim 3, characterized in that: the feedback winding (13) comprises a seventh winding (131), the seventh winding (131) is wound on the side wall of the first winding (111), the side wall of the seventh winding (131) is wound on the secondary winding (12), one end of the seventh winding (131) is connected to the first pin, and the other end of the seventh winding is connected to the second pin (402).

5. The novel flyback multipath accurate dynamic regulation transformer of claim 4, characterized in that: the secondary winding (12) comprises a third winding (121) and a fourth winding (122), the third winding (121) and the fourth winding (122) are wound on the side wall of the seventh winding (131), one end of the third winding (121) is connected to a seventh pin (407), the other end of the third winding is connected to an eighth pin (408), one end of the fourth winding (122) is connected to a ninth pin (409), and the other end of the fourth winding is connected to a tenth pin (410).

6. The novel flyback multipath accurate dynamic regulation transformer of claim 5, characterized in that: the secondary winding (12) further comprises a fifth winding (123) and a sixth winding (124), the fifth winding (123) is wound on the side walls of the third winding (121) and the fourth winding (122), the sixth winding (124) is wound on the side wall of the fifth winding (123), the second winding (112) is wound on the side wall of the sixth winding (124), one end of the fifth winding (123) is connected to a sixth pin (406), the other end of the fifth winding is connected to a twelfth pin (412), one end of the sixth winding (124) is connected to a ninth pin (409), the other end of the sixth winding is connected to an eleventh pin (411), and the fourth winding (122) is connected to one side of the sixth winding (124) in series.