Miniaturized and low-loss secondary winding PCB assembly and transformer

Abstract

The invention belongs to the technical field of transformer loss control, and particularly relates to a miniaturized and low-loss secondary winding PCB assembly and a transformer. The device comprises at least two PCBs (Printed Circuit Board) for shunting; the control circuits are integrated on two sides of the PCB and are used for adjusting current; the PCB comprises a first area and a second area; the first area is provided with at least one first through hole; at least one side wall of the first area is provided with a metal layer; the second region is away from the secondary winding; the control circuit comprises a first control circuit and a second control circuit; the first driving control circuit is electrically connected with the first control circuit and is used for driving and controlling the first control circuit; the circuit also comprises a second driving control circuit which is electrically connected with the second control circuit and is used for driving and controlling the second control circuit. The third control circuit is used for filtering the output voltage; therefore, miniaturization and low loss of the transformer are realized, namely, the loss of the transformer caused by current can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer loss control, and in particular relates to a miniaturized and low-loss secondary winding PCB board assembly and a transformer. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are primary coil, secondary coil and iron core (magnetic core). Its main functions include voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. The existing primary coil and secondary coil are generally overlapped to achieve the predetermined power supply power, but the existing transformer has the following technical defects.

[0003] When the same power is guaranteed, the volume is reduced, and the density of the corresponding coil will increase accordingly. When the density increases, the heat dissipation will decrease accordingly, so the stability of its power will also be affected. Although the prior art also has a structure that uses a PCB board as a secondary winding, it is only a single secondary winding. In actual power supply applications, additional electronic components are required to adjust the current and voltage to achieve the predetermined technical effect.

[0004] In addition, the traditional transformer has heat problems caused by lack of airflow (the transformer is cold outside and hot inside). In addition, the traditional transformer and SR MOS are divided into two parts, so the loop is longer and the parasitic inductance of the loop is larger, which will cause the Vds of the MOS tube to be too large. In addition, the distance between the transformer and the output terminal (or output connector) in the traditional structure is longer and the loss is large. In the application of high current of traditional transformers, the current will be concentrated on a single PCB, causing large voltage drop and loss. In addition, the traditional design uses a centralized inductor structure, which also has the problem of large loss.

[0005] Therefore, in view of the above-mentioned technical problems and defects, it is urgent to design and develop a miniaturized and low-loss secondary winding PCB board assembly and transformer. Summary of the invention

[0006] In order to overcome the shortcomings and difficulties of the above-mentioned prior art, the purpose of the present invention is to provide a miniaturized and low-loss secondary winding PCB board assembly and a transformer; so as to achieve miniaturization and low loss of the transformer, that is, to reduce the loss of the transformer caused by the current.

[0007] The object of the present invention is achieved by: comprising at least two PCB boards for current shunting; and a control circuit integrated on both sides of the PCB boards and used for regulating current;

[0008] The PCB board includes a first area and a second area; the first area is provided with at least one first through hole; at least one side wall of the first area is provided with a metal layer; wherein the metal layer is a secondary winding; the second area is far away from the secondary winding;

[0009] The control circuit includes a first control circuit and a second control circuit; and a first drive control circuit electrically connected to the first control circuit and used to drive and control the first control circuit; the circuit also includes a second drive control circuit electrically connected to the second control circuit and used to drive and control the second control circuit; and a third control circuit for filtering the output voltage.

[0010] Furthermore, the PCB board is provided with a first pin and a second pin at a position located in the second area; the first pin and the second pin are provided on different horizontal planes or on the same plane;

[0011] The first pin and / or the second pin are made of (PCB-bonded) copper or aluminum, and extend to the middle of the second area;

[0012] A solder layer is provided on the upper end wall of the second region.

[0013] Furthermore, at least one side wall of the second region is provided with at least one inductor for filtering the output voltage.

[0014] Furthermore, a sixty-first bidirectional trigger diode is provided in the first control circuit;

[0015] One end of the sixty-first bidirectional trigger diode is respectively connected to the drain of the sixty-second field effect transistor, the drain of the sixty-third field effect transistor, the drain of the sixty-fourth field effect transistor, and the input end of the transformer;

[0016] The other end of the sixty-first bidirectional trigger diode is respectively connected to the source of the sixty-second field effect transistor, the source of the sixty-third field effect transistor, the source of the sixty-fourth field effect transistor, one end of the sixty-fifth resistor, the first drive control circuit, the second control circuit, the third control circuit, and the second drive control circuit;

[0017] The other end of the sixth resistor is respectively connected to one end of the sixth resistor, one end of the sixth resistor, and one end of the sixth resistor.

[0018] The other end of the 603 resistor is connected to the gate of the 602 field effect transistor; the other end of the 602 resistor is connected to the gate of the 603 field effect transistor; the other end of the 608 resistor is connected to the gate of the 604 field effect transistor.

[0019] Further, the first drive control circuit is provided with a sixth zero-zero driver;

[0020] The first pin of the sixth zero zero driver is respectively connected to one end of the sixth twenty one capacitor and the second drive control circuit;

[0021] The third pin of the sixth zero zero driver is respectively connected to one end of the sixth twenty three capacitor and one end of the sixth zero six resistor;

[0022] The fourth pin of the sixth zero zero driver is respectively connected to the other end of the sixth twenty one capacitor, the other end of the sixth twenty three capacitor, the first control circuit, and the second pin of the sixth zero zero driver; the fifth pin of the sixth zero zero driver is connected to the first control circuit.

[0023] Further, a sixth zero zero bidirectional trigger diode is provided in the second control circuit;

[0024] One end of the 600th bidirectional trigger diode is respectively connected to the drain of the 600th field effect transistor, the drain of the 601st field effect transistor, the drain of the 605th field effect transistor, and the input end of the transformer;

[0025] The other end of the sixth 00th bidirectional trigger diode is respectively connected to the source of the sixth 00th field effect transistor, the source of the sixth 01st field effect transistor, the source of the sixth 05th field effect transistor, one end of the sixth 05th resistor, the first drive control circuit, the first control circuit, the third control circuit, and the second drive control circuit;

[0026] The other end of the 604th resistor is respectively connected to one end of the 601st resistor, one end of the 600th resistor, and one end of the 609th resistor;

[0027] The other end of the 601st resistor is connected to the gate of the 600th field effect transistor; the other end of the 600th resistor is connected to the gate of the 601st field effect transistor; the other end of the 609th resistor is connected to the gate of the 605th field effect transistor.

[0028] Further, the second drive control circuit is provided with a 601st driver;

[0029] The first pin of the 601st driver is respectively connected to one end of the 620th capacitor and the first drive control circuit;

[0030] The third pin of the sixty-first driver is respectively connected to one end of the sixty-second capacitor and one end of the sixty-seventh resistor;

[0031] The fourth pin of the 601 driver is respectively connected to the other end of the 622 capacitor, the other end of the 622 capacitor, the second control circuit, and the second pin of the 601 driver; the fifth pin of the 601 driver is connected to the second control circuit.

[0032] Further, the third control circuit is provided with at least twenty capacitors connected in parallel with each other; the third control circuit is provided with a sixth inductor, and one end of the sixth inductor is connected to the output end of the transformer;

[0033] The other end of the 601st inductor is respectively connected to one end of the 600th capacitor, one end of the 601st capacitor, one end of the 602nd capacitor, one end of the 603rd capacitor, one end of the 604th capacitor, one end of the 605th capacitor, one end of the 606th capacitor, one end of the 607th capacitor, one end of the 608th capacitor, one end of the 609th capacitor, one end of the 610th capacitor, one end of the 611th capacitor, one end of the 612th capacitor, one end of the 613th capacitor, one end of the 614th capacitor, one end of the 615th capacitor, one end of the 616th capacitor, one end of the 617th capacitor, one end of the 618th capacitor, one end of the 619th capacitor, and the input end of the transformer;

[0034] The other end of the 600th capacitor is respectively connected to the other end of the 601st capacitor, the other end of the 602nd capacitor, the other end of the 603rd capacitor, the other end of the 604th capacitor, the other end of the 605th capacitor, the other end of the 606th capacitor, the other end of the 607th capacitor, the other end of the 608th capacitor, the other end of the 609th capacitor, the other end of the 610th capacitor, the other end of the 611th capacitor, the other end of the 612th capacitor, the other end of the 613th capacitor, the other end of the 614th capacitor, the other end of the 615th capacitor, the other end of the 616th capacitor, the other end of the 617th capacitor, the other end of the 618th capacitor, the other end of the 619th capacitor, the first drive control circuit, the first control circuit, the second control circuit, and the second drive control circuit.

[0035] In order to achieve the purpose of the solution of the present invention, a miniaturized and low-loss transformer is also provided, and the transformer includes the miniaturized and low-loss secondary winding PCB board assembly.

[0036] Further, the transformer comprises an iron core, a primary winding and the miniaturized and low-loss secondary winding PCB board assembly;

[0037] The primary winding and the secondary winding PCB board assembly are stacked in sequence, the primary winding is provided with at least one second through hole, the middle of the iron core is provided with at least one core column, the first through hole and the second through hole are sleeved on the core column, the primary winding is stacked with the first area, and the second area is far away from the position of the iron core;

[0038] The primary winding is a coil or a primary PCB board, and the primary PCB board is provided with a primary metal layer;

[0039] An insulating gasket or structure is provided between the primary winding and the secondary winding PCB board assembly, and the insulating gasket or structure creates an air duct gap between the primary winding and the secondary winding PCB board assembly; that is, the insulating sheet is not necessary, and a structure can also be used to create an air duct gap.

[0040] The present invention comprises at least two PCB boards for current shunting; and a control circuit integrated on both sides of the PCB boards and used for adjusting current; the PCB boards comprise a first area and a second area; the first area is provided with at least one first through hole; at least one side wall of the first area is provided with a metal layer; wherein the metal layer is a secondary winding; the second area is away from the secondary winding; the control circuit comprises a first control circuit and a second control circuit; and a first drive control circuit electrically connected to the first control circuit and used for driving and controlling the first control circuit; the circuit further comprises a second drive control circuit electrically connected to the second control circuit and used for driving and controlling the second control circuit; and a third control circuit for filtering the output voltage; so as to realize miniaturization and low loss of the transformer, that is, the loss of the transformer caused by the current can be reduced.

[0041] That is to say, the scheme of the present invention adopts a multi-level structural design in the transformer design, and the air duct is formed by setting the spacing between each level, so that the wind can blow through the inside of the transformer to take away the heat. In addition, the scheme of the present invention integrates the transformer secondary coil and SR MOS on a PCB, greatly shortening the distance from the transformer to the SR MOS, thereby reducing the parasitic inductance of the loop. Reducing parasitic inductance can greatly reduce the Vds voltage stress of the SR MOS and increase the service life.

[0042] In addition, the negative output pin of the highly integrated transformer proposed in the solution of the present invention is shorter and can be directly welded on the output gold finger. Different from the traditional design, it is first welded on the mainboard and then connected to the gold finger through the copper busbar. In the solution of the present invention, at least two PCBs are used for effective shunting, so the loss is effectively reduced; moreover, at least two PCBs are used, and each PCB has an LC filter, so a larger inductance can be used in the design of the inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 This is a three-dimensional schematic diagram of a miniaturized and low-loss secondary winding PCB board assembly of the present invention. Figure 1 ;

[0045] Figure 2 This is a three-dimensional schematic diagram of a miniaturized and low-loss secondary winding PCB board assembly of the present invention. Figure 2 ;

[0046] Figure 3 It is an exploded diagram of a miniaturized and low-loss secondary winding PCB board assembly and a transformer of the present invention;

[0047] Figure 4 It is a cross-sectional view of a miniaturized and low-loss secondary winding PCB board assembly and a transformer of the present invention;

[0048] Figure 5 This is a three-dimensional schematic diagram of a miniaturized and low-loss secondary winding PCB board assembly and a transformer of the present invention. Figure 1 ;

[0049] Figure 6 This is a three-dimensional schematic diagram of a miniaturized and low-loss secondary winding PCB board assembly and a transformer of the present invention. Figure 2 ;

[0050] Figure 7 It is a schematic diagram of an integrated circuit of a miniaturized and low-loss secondary winding PCB board assembly of the present invention;

[0051] Figure 8 It is a schematic diagram of a printed metal layer of a miniaturized and low-loss secondary winding PCB board assembly of the present invention;

[0052] Fig. 9 It is a schematic diagram of the integrated circuit architecture of a miniaturized and low-loss secondary winding PCB board assembly of the present invention;

[0053] In the figure: 1-PCB board body; 11-first area; 12-second area; 1a-metal layer; 1b-electronic component; 21-first pin; 22-second pin; 3-inductor; 41-primary winding; 42-secondary winding PCB board assembly; 5-iron core; 50-core column; 51-first through hole; 52-second through hole; 6-insulating gasket; 60-air duct gap; ZD601-sixth-one bidirectional trigger diode; Q602-sixth-two field effect transistor; Q603-sixth-three field effect transistor ;Q604-sixth zero fourth field effect tube;R605-sixth zero fifth resistor;R603-sixth zero third resistor;R602-sixth zero second resistor;R608-sixth zero eighth resistor;M600-sixth zero zero driver;C621-sixth twenty first capacitor;C623-sixth twenty third capacitor;R606-sixth zero sixth resistor;ZD600-sixth zero zero bidirectional trigger diode;Q600-sixth zero zero field effect tube;Q601-sixth zero first field effect tube;Q605-sixth zero fifth field effect tube;R6 04-sixth 04th resistor; R601-sixth 01st resistor; R600-sixth 00th resistor; R609-sixth 09th resistor; M601-sixth 01st driver; C620-sixth 20th capacitor; C622-sixth 22nd capacitor; R607-sixth 07th resistor; L601-sixth 01st inductor; C600-sixth 00th capacitor; C601-sixth 01st capacitor; C602-sixth 02nd capacitor; C603-sixth 03rd capacitor; C604-sixth 04th capacitor; C605-sixth The six-hundred-five capacitor; C606-six-hundred-six capacitor; C607-six-hundred-seven capacitor; C608-six-hundred-eight capacitor; C609-six-hundred-ninth capacitor; C610-six-hundred-tenth capacitor; C611-six-hundred-eleventh capacitor; C612-six-hundred-twelveth capacitor; C613-six-hundred-thirteenth capacitor; C614-six-hundred-fourteenth capacitor; C615-six-hundred-fifth capacitor; C616-six-sixteenth capacitor; C617-six-hundred-seventh capacitor; C618-six-hundred-eighth capacitor; C619-six-hundred-nineteenth capacitor. DETAILED DESCRIPTION

[0054] In order to better understand the purpose, technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0055] The present invention may also be implemented or applied through other different specific examples, and the details in this specification may also be modified and changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0056] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. Secondly, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] The present invention will be further described below in conjunction with the accompanying drawings.

[0059] like Figure 1-Figure 9 As shown, the present invention provides a miniaturized and low-loss secondary winding PCB board assembly, including at least two PCB boards for shunting; and a control circuit integrated on both sides of the PCB boards and used to adjust the current; in the scheme of the present invention, the number of the PCB boards for shunting is greater than or equal to two; wherein the preferred embodiment is six.

[0060] The PCB board includes a first area and a second area; the first area is provided with at least one first through hole; at least one side wall of the first area is provided with a metal layer; wherein the metal layer is a secondary winding; the second area is far away from the secondary winding;

[0061] The control circuit includes a first control circuit and a second control circuit; and a first drive control circuit electrically connected to the first control circuit and used to drive and control the first control circuit; the circuit also includes a second drive control circuit electrically connected to the second control circuit and used to drive and control the second control circuit; and a third control circuit for filtering the output voltage.

[0062] The PCB board is provided with a first pin and a second pin at a position located in the second area; the first pin and the second pin are arranged on different horizontal planes or on the same plane;

[0063] The first pin and / or the second pin are made of (PCB-bonded) copper or aluminum, and extend to the middle of the second area;

[0064] A solder layer is provided on the upper end wall of the second region.

[0065] At least one side wall of the second region is provided with at least one inductor for filtering the output voltage.

[0066] A sixty-first bidirectional trigger diode is provided in the first control circuit;

[0067] One end of the sixty-first bidirectional trigger diode is respectively connected to the drain of the sixty-second field effect transistor, the drain of the sixty-third field effect transistor, the drain of the sixty-fourth field effect transistor, and the input end of the transformer;

[0068] The other end of the sixty-first bidirectional trigger diode is respectively connected to the source of the sixty-second field effect transistor, the source of the sixty-third field effect transistor, the source of the sixty-fourth field effect transistor, one end of the sixty-fifth resistor, the first drive control circuit, the second control circuit, the third control circuit, and the second drive control circuit;

[0069] The other end of the sixth resistor is respectively connected to one end of the sixth resistor, one end of the sixth resistor, and one end of the sixth resistor.

[0070] The other end of the 603 resistor is connected to the gate of the 602 field effect transistor; the other end of the 602 resistor is connected to the gate of the 603 field effect transistor; the other end of the 608 resistor is connected to the gate of the 604 field effect transistor.

[0071] The models of the 602nd field effect transistor, the source of the 603rd field effect transistor and the 604th field effect transistor are all ISC015N04NM5.

[0072] The first drive control circuit is provided with a sixth zero-zero driver;

[0073] The first pin of the sixth zero zero driver is respectively connected to one end of the sixth twenty one capacitor and the second drive control circuit;

[0074] The third pin of the sixth zero zero driver is respectively connected to one end of the sixth twenty three capacitor and one end of the sixth zero six resistor;

[0075] The fourth pin of the sixth zero zero driver is respectively connected to the other end of the sixth twenty one capacitor, the other end of the sixth twenty three capacitor, the first control circuit, and the second pin of the sixth zero zero driver; the fifth pin of the sixth zero zero driver is connected to the first control circuit.

[0076] The model of the sixth zero driver is UCC27517DBVR.

[0077] The second control circuit is provided with a sixth zero zero bidirectional trigger diode;

[0078] One end of the 600th bidirectional trigger diode is respectively connected to the drain of the 600th field effect transistor, the drain of the 601st field effect transistor, the drain of the 605th field effect transistor, and the input end of the transformer;

[0079] The other end of the sixth 00th bidirectional trigger diode is respectively connected to the source of the sixth 00th field effect transistor, the source of the sixth 01st field effect transistor, the source of the sixth 05th field effect transistor, one end of the sixth 05th resistor, the first drive control circuit, the first control circuit, the third control circuit, and the second drive control circuit;

[0080] The other end of the 604th resistor is respectively connected to one end of the 601st resistor, one end of the 600th resistor, and one end of the 609th resistor;

[0081] The other end of the 601st resistor is connected to the gate of the 600th field effect transistor; the other end of the 600th resistor is connected to the gate of the 601st field effect transistor; the other end of the 609th resistor is connected to the gate of the 605th field effect transistor.

[0082] The models of the 600th field effect transistor, the source of the 601st field effect transistor and the 605th field effect transistor are all ISC015N04NM5.

[0083] The second drive control circuit is provided with a 601st driver;

[0084] The first pin of the 601st driver is respectively connected to one end of the 620th capacitor and the first drive control circuit;

[0085] The third pin of the sixty-first driver is respectively connected to one end of the sixty-second capacitor and one end of the sixty-seventh resistor;

[0086] The fourth pin of the 601 driver is respectively connected to the other end of the 622 capacitor, the other end of the 622 capacitor, the second control circuit, and the second pin of the 601 driver; the fifth pin of the 601 driver is connected to the second control circuit.

[0087] The model of the 601st driver is UCC27517DBVR.

[0088] The third control circuit is provided with at least twenty capacitors connected in parallel with each other; the third control circuit is provided with a sixth inductor, one end of which is connected to the output end of the transformer;

[0089] The other end of the 601st inductor is respectively connected to one end of the 600th capacitor, one end of the 601st capacitor, one end of the 602nd capacitor, one end of the 603rd capacitor, one end of the 604th capacitor, one end of the 605th capacitor, one end of the 606th capacitor, one end of the 607th capacitor, one end of the 608th capacitor, one end of the 609th capacitor, one end of the 610th capacitor, one end of the 611th capacitor, one end of the 612th capacitor, one end of the 613th capacitor, one end of the 614th capacitor, one end of the 615th capacitor, one end of the 616th capacitor, one end of the 617th capacitor, one end of the 618th capacitor, one end of the 619th capacitor, and the input end of the transformer;

[0090] The other end of the 600th capacitor is respectively connected to the other end of the 601st capacitor, the other end of the 602nd capacitor, the other end of the 603rd capacitor, the other end of the 604th capacitor, the other end of the 605th capacitor, the other end of the 606th capacitor, the other end of the 607th capacitor, the other end of the 608th capacitor, the other end of the 609th capacitor, the other end of the 610th capacitor, the other end of the 611th capacitor, the other end of the 612th capacitor, the other end of the 613th capacitor, the other end of the 614th capacitor, the other end of the 615th capacitor, the other end of the 616th capacitor, the other end of the 617th capacitor, the other end of the 618th capacitor, the other end of the 619th capacitor, the first drive control circuit, the first control circuit, the second control circuit, and the second drive control circuit.

[0091] The model of the 601st inductor is MHCP1104VE-R22-R.

[0092] Specifically, in a specific embodiment of the scheme of the present invention, the input current is rectified by the first control circuit and the second control circuit in the circuit for adjusting the transformer current, that is, by the first control circuit and the second control circuit, and in combination with the first drive control circuit and the second drive control circuit provided in the circuit; wherein the first drive control circuit and the second drive control circuit are used to reduce the breakdown current.

[0093] In combination with the miniaturized and low-loss secondary winding PCB board assembly in this solution, for example, when six PCBs (the circuit of this solution is built into the PCB board) are used for effective shunt, the loss is effectively reduced. In the application of 3200W output 264A, the loss is reduced by 600% ((264^2)*R / ((264 / 6)^2*6)). The third control electronic control is connected in parallel through multiple capacitors, and combined with the set inductor, it realizes the filtering effect on the output voltage of the transformer. Moreover, there is an LC filter on each PCB of the transformer. Because of the shunt, a larger inductance can be used in the inductance design of the above circuit, such as more than 1uH, which is 10 times the difference compared with the 0.1uH of the centralized inductor, so the output ripple is lower.

[0094] In order to achieve the purpose of the solution of the present invention, a miniaturized and low-loss transformer is also provided, characterized in that the transformer includes the miniaturized and low-loss secondary winding PCB board assembly.

[0095] The transformer comprises an iron core, a primary winding and the miniaturized and low-loss secondary winding PCB board assembly;

[0096] The primary winding and the secondary winding PCB board assembly are stacked in sequence, the primary winding is provided with at least one second through hole, the middle of the iron core is provided with at least one core column, the first through hole and the second through hole are sleeved on the core column, the primary winding is stacked with the first area, and the second area is far away from the position of the iron core;

[0097] The primary winding is a coil or a primary PCB board, and the primary PCB board is provided with a primary metal layer;

[0098] An insulating gasket or structure is provided between the primary winding and the secondary winding PCB board assembly, and the insulating gasket or structure creates an air duct gap between the primary winding and the secondary winding PCB board assembly. That is to say, the insulating sheet is not necessary, and a structure can also be used to create the air duct gap.

[0099] Specifically, in a specific embodiment of the present invention, a secondary winding PCB board assembly and a transformer having the same are provided, including a PCB board, wherein the PCB board includes a first area 11 and a second area 12;

[0100] and a first through hole, wherein the first through hole is provided in the first region 11, at least one side wall of the first region 11 is provided with a metal layer 1a, and the metal layer 1a is a secondary winding;

[0101] The electronic component 1b in the control circuit, the second area 12 is far away from the secondary winding, the electronic component 1b is arranged on at least one side wall of the second area 12, and the electronic component 1b is used to control the current passing through the secondary winding.

[0102] By setting the PCB board to the first area 11 and the second area 12, the electronic component 1b can control the current of the secondary winding, and the corresponding current stroke is shorter, so the corresponding loss will also be reduced, thereby ensuring the stability of current and voltage, as well as the stability of the power supply or application product, and effectively improving the stability of the power supply.

[0103] Preferably, the PCB board is provided with a first pin 21 and a second pin 22 at the position of the second area 12. The first pin 21 and the second pin 22 enable the secondary winding to be directly connected to the main control board, thereby adjusting the current change and the voltage change according to actual needs, thereby adjusting the power change, and effectively ensuring the stability of the components used. In one embodiment, the first pin 21 and the second pin 22 are used as the output end and the input end, respectively.

[0104] Accordingly, the electronic component 1b may be provided with a detection or monitoring component, so as to timely know the working state of the module, and then adjust the working state between the modules through the control device. Preferably, it can be understood that the secondary winding is the secondary side.

[0105] In the embodiment of the present invention, the first pin 21 and the second pin 22 are arranged on different horizontal planes. The shorter pin can be welded on the sub-board and connected to the main board through the sub-board, so as to further shorten the current stroke, thereby reducing losses and improving control stability.

[0106] In the embodiment of the present invention, at least one side wall of the second area 12 is provided with an inductor 3 (its volume is relatively small, so in the design of the power supply, it is directly integrated into the module) for filtering the output voltage. Existing power transformers, such as mobile phone chargers, computer chargers, server chargers, etc., generally use integrated large capacitors to achieve current filtering (for example: 3200W power, then the capacitor needs to pass the current of 260A, then the corresponding volume is also relatively large, through the setting of the secondary winding PCB board module, multiple 40A-50A inductors 3 can be used for shunting, thereby reducing the volume of the overall power supply, while being more integrated).

[0107] The first pin 21 and / or the second pin 22 are made of (PCB-bonded) copper or aluminum or are provided with a metal block 200 (which improves the current flow and heat dissipation effect), and extend to the middle of the second area 12;

[0108] The upper end wall of the second region 12 is provided with a solder layer 201. This structure can effectively improve the heat dissipation effect of the secondary winding PCB board, and at the same time can also increase the conductive area.

[0109] Specifically, the electronic component 1b is provided with two groups, which are respectively located on opposite sides of the second area 12. In the actual test, the electronic component 1b is provided with two groups, which can be based on the needs, wherein the electronic component 1b includes a rectifier module and a driving module for controlling the rectifier module, and the two groups are respectively arranged on both sides of the second area 12, which effectively avoids the accumulation of the electronic components 1b, and also makes the functional control more comprehensive and stable, which can effectively realize the modular production of the electronic components 1b, and improve the assembly stability and assembly efficiency, such as Figure 7 shown.

[0110] In the embodiment of the present invention, the metal layer 1a is a copper sheet or a ring enameled wire group or a printed metal layer. According to different usage scenarios, it can be adjusted according to the current size and power requirements. For example, when used as a mobile phone charging power source, the area and thickness of the metal layer can be reduced, and when used as a server and other products, a metal layer with a larger area and a larger thickness can be often used, thereby improving the operating stability of the power supply.

[0111] A transformer is also provided in a specific embodiment of the solution of the present invention, comprising an iron core 5, a primary winding 41 and the above-mentioned secondary winding PCB board assembly;

[0112] The primary winding 41 and the secondary winding PCB board assembly are stacked in sequence, the primary winding 41 is provided with a second through hole, the iron core 5 is provided with a core column 50, the first through hole and the second through hole are sleeved on the core column 50, the primary winding 41 is stacked with the first area 11, and the second area 12 is far away from the position of the iron core 5.

[0113] By adopting this structure, compared with the existing technology, at the same power, the thickness of the secondary winding PCB board assembly is much smaller than the existing secondary winding coil structure. At the same time, when used as a power module, the electronic component 1b can be directly integrated into the second area 12, thereby reducing the subsequent installation of the electronic component 1b of the main PCB board, and the stroke is smaller and the loss is smaller.

[0114] In the embodiment of the present invention, the primary winding 41 is a coil or a primary PCB board, and the primary PCB board is provided with a primary metal layer. When the number of layers of the PCB board can reach a predetermined value, the coil can also be replaced with a primary PCB board, thereby further improving the modular design of the transformer. Of course, for some transformers with lower power, the primary winding 41 can also be a primary PCB board, and a primary metal layer can be provided in its structure. Then, for an existing high-power mobile phone charger (for example: 120w, its volume can be further reduced).

[0115] Specifically, an insulating gasket 6 is provided between the primary winding 41 and the secondary winding PCB board assembly 42. The insulating gasket creates a duct gap 60 between the primary winding 41 and the secondary winding PCB board assembly 42, thereby effectively improving the heat dissipation of the transformer. Compared with the existing situation where the primary coil and the secondary coil are stacked on each other and the heat dissipation is unstable, the setting of the gasket does not affect the working state of the transformer. At the same time, the duct gap 60 can also effectively improve its heat dissipation and ensure the stability of the operation. Under certain high temperature conditions, the coil and the electronic component 1b will be affected by the stability and the function will be attenuated (for example: resistance value, voltage value and current value).

[0116] In the embodiment of the present invention, the insulating gasket 6 is in a block or sheet structure. In one embodiment, the iron core 5 is symmetrically arranged (core column symmetry). Of course, one core column can also be used to install all the primary windings 41 and the secondary windings.

[0117] The printed metal plate can be referenced Figure 8 The ring is a printed metal layer, wherein the ring can be spiral (not a single ring), and each printed metal layer, end A and end B are connected end to end through a multi-layer PCB board to form a coil, that is, the coil is integrated, and the input end and output section are also integrated.

[0118] The present invention comprises at least two PCB boards for current shunting; and a control circuit integrated on both sides of the PCB boards and used for adjusting current; the PCB boards comprise a first area and a second area; the first area is provided with at least one first through hole; at least one side wall of the first area is provided with a metal layer; wherein the metal layer is a secondary winding; the second area is away from the secondary winding; the control circuit comprises a first control circuit and a second control circuit; and a first drive control circuit electrically connected to the first control circuit and used for driving and controlling the first control circuit; the circuit further comprises a second drive control circuit electrically connected to the second control circuit and used for driving and controlling the second control circuit; and a third control circuit for filtering the output voltage; so as to realize miniaturization and low loss of the transformer, that is, the loss of the transformer caused by the current can be reduced.

[0119] That is to say, the scheme of the present invention adopts a multi-level structure design in the transformer design, and there is a spacing of about 2mm between each level to form an air duct, so that the wind can blow through the inside of the transformer to take away the heat. In addition, the scheme of the present invention integrates the transformer secondary coil and SR MOS on a PCB, greatly shortening the distance from the transformer to the SR MOS, thereby reducing the parasitic inductance of the loop. Reducing parasitic inductance can greatly reduce the Vds voltage stress of the SR MOS and increase its service life.

[0120] In addition, the negative output pin of the highly integrated transformer proposed in the present invention is shorter and can be directly welded to the output gold finger. Different from the traditional design, it is first welded to the motherboard and then connected to the gold finger through the copper busbar. The solution proposed in the present invention shortens the loop length by at least 3 times.

[0121] In the solution of the present invention, at least two PCBs are used for effective shunting, so the loss is effectively reduced. In the application of 3200W output 264A, the loss is reduced by 600% ((264^2)*R / ((264 / 6)^2*6)). In addition, at least two PCBs are used, and each PCB has an LC filter. In the design of the inductor, a larger inductance can be used, for example: more than 1uH, compared with the 0.1uH of the centralized inductor, there will be a difference of 10 times, so the output ripple is lower.

[0122] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A miniaturized and low-loss secondary winding PCB board assembly, characterized in that: It comprises at least two PCB boards for current shunting; and a control circuit integrated on both sides of the PCB boards and used for regulating current; The PCB board includes a first area and a second area; the first area is provided with at least one first through hole; at least one side wall of the first area is provided with a metal layer; wherein the metal layer is a secondary winding; the second area is far away from the secondary winding; The control circuit includes a first control circuit and a second control circuit; and a first drive control circuit electrically connected to the first control circuit and used to drive and control the first control circuit; the circuit also includes a second drive control circuit electrically connected to the second control circuit and used to drive and control the second control circuit; and a third control circuit for filtering the output voltage.

2. A miniaturized and low-loss secondary winding PCB board assembly according to claim 1, characterized in that: The PCB board is provided with a first pin and a second pin at a position located in the second area; the first pin and the second pin are arranged on different horizontal planes or on the same plane; The first pin and / or the second pin are made of copper or aluminum, and extend to the middle of the second area; A solder layer is provided on the upper end wall of the second region.

3. A miniaturized and low-loss secondary winding PCB board assembly according to claim 1 or 2, characterized in that: At least one side wall of the second region is provided with at least one inductor for filtering the output voltage.

4. The miniaturized and low-loss secondary winding PCB board assembly according to claim 1, characterized in that: A sixty-first bidirectional trigger diode is provided in the first control circuit; One end of the sixty-first bidirectional trigger diode is respectively connected to the drain of the sixty-second field effect transistor, the drain of the sixty-third field effect transistor, the drain of the sixty-fourth field effect transistor, and the input end of the transformer; The other end of the sixty-first bidirectional trigger diode is respectively connected to the source of the sixty-second field effect transistor, the source of the sixty-third field effect transistor, the source of the sixty-fourth field effect transistor, one end of the sixty-fifth resistor, the first drive control circuit, the second control circuit, the third control circuit, and the second drive control circuit; The other end of the sixth resistor is respectively connected to one end of the sixth resistor, one end of the sixth resistor, and one end of the sixth resistor. The other end of the 603 resistor is connected to the gate of the 602 field effect transistor; the other end of the 602 resistor is connected to the gate of the 603 field effect transistor; the other end of the 608 resistor is connected to the gate of the 604 field effect transistor.

5. A miniaturized and low-loss secondary winding PCB board assembly according to claim 1 or 4, characterized in that: The first drive control circuit is provided with a sixth zero-zero driver; The first pin of the sixth zero zero driver is respectively connected to one end of the sixth twenty one capacitor and the second drive control circuit; The third pin of the sixth zero zero driver is respectively connected to one end of the sixth twenty three capacitor and one end of the sixth zero six resistor; The fourth pin of the sixth zero zero driver is respectively connected to the other end of the sixth twenty one capacitor, the other end of the sixth twenty three capacitor, the first control circuit, and the second pin of the sixth zero zero driver; the fifth pin of the sixth zero zero driver is connected to the first control circuit.

6. A miniaturized and low-loss secondary winding PCB board assembly according to claim 1 or 4, characterized in that: The second control circuit is provided with a sixth zero zero bidirectional trigger diode; One end of the 600th bidirectional trigger diode is respectively connected to the drain of the 600th field effect transistor, the drain of the 601st field effect transistor, the drain of the 605th field effect transistor, and the input end of the transformer; The other end of the sixth 00th bidirectional trigger diode is respectively connected to the source of the sixth 00th field effect transistor, the source of the sixth 01st field effect transistor, the source of the sixth 05th field effect transistor, one end of the sixth 05th resistor, the first drive control circuit, the first control circuit, the third control circuit, and the second drive control circuit; The other end of the 604th resistor is respectively connected to one end of the 601st resistor, one end of the 600th resistor, and one end of the 609th resistor; The other end of the 601st resistor is connected to the gate of the 600th field effect transistor; the other end of the 600th resistor is connected to the gate of the 601st field effect transistor; the other end of the 609th resistor is connected to the gate of the 605th field effect transistor.

7. A miniaturized and low-loss secondary winding PCB board assembly according to claim 6, characterized in that: The second drive control circuit is provided with a 601st driver; The first pin of the 601st driver is respectively connected to one end of the 620th capacitor and the first drive control circuit; The third pin of the sixty-first driver is respectively connected to one end of the sixty-second capacitor and one end of the sixty-seventh resistor; The fourth pin of the 601 driver is respectively connected to the other end of the 622 capacitor, the other end of the 622 capacitor, the second control circuit, and the second pin of the 601 driver; the fifth pin of the 601 driver is connected to the second control circuit.

8. The miniaturized and low-loss secondary winding PCB board assembly according to claim 6, characterized in that: The third control circuit is provided with at least twenty capacitors connected in parallel with each other; the third control circuit is provided with a sixth inductor, one end of which is connected to the output end of the transformer; The other end of the 601st inductor is respectively connected to one end of the 600th capacitor, one end of the 601st capacitor, one end of the 602nd capacitor, one end of the 603rd capacitor, one end of the 604th capacitor, one end of the 605th capacitor, one end of the 606th capacitor, one end of the 607th capacitor, one end of the 608th capacitor, one end of the 609th capacitor, one end of the 610th capacitor, one end of the 611th capacitor, one end of the 612th capacitor, one end of the 613th capacitor, one end of the 614th capacitor, one end of the 615th capacitor, one end of the 616th capacitor, one end of the 617th capacitor, one end of the 618th capacitor, one end of the 619th capacitor, and the input end of the transformer; The other end of the 600th capacitor is respectively connected to the other end of the 601st capacitor, the other end of the 602nd capacitor, the other end of the 603rd capacitor, the other end of the 604th capacitor, the other end of the 605th capacitor, the other end of the 606th capacitor, the other end of the 607th capacitor, the other end of the 608th capacitor, the other end of the 609th capacitor, the other end of the 610th capacitor, the other end of the 611th capacitor, the other end of the 612th capacitor, the other end of the 613th capacitor, the other end of the 614th capacitor, the other end of the 615th capacitor, the other end of the 616th capacitor, the other end of the 617th capacitor, the other end of the 618th capacitor, the other end of the 619th capacitor, the first drive control circuit, the first control circuit, the second control circuit, and the second drive control circuit.

9. A miniaturized and low-loss transformer, characterized in that: The transformer comprises at least one miniaturized and low-loss secondary winding PCB board assembly as claimed in any one of claims 1 to 8.

10. A miniaturized and low-loss transformer according to claim 9, characterized in that: The transformer comprises an iron core, a primary winding and the miniaturized and low-loss secondary winding PCB board assembly; The primary winding and the secondary winding PCB board assembly are stacked in sequence, the primary winding is provided with at least one second through hole, the middle of the iron core is provided with at least one core column, the first through hole and the second through hole are sleeved on the core column, the primary winding is stacked with the first area, and the second area is far away from the position of the iron core; The primary winding is a coil or a primary PCB board, and the primary PCB board is provided with a primary metal layer; An insulating gasket or structure is provided between the primary winding and the secondary winding PCB board assembly, and the insulating gasket or structure creates an air duct gap between the primary winding and the secondary winding PCB board assembly.

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