PCB wiring structure of high-efficiency three-interleaving LLC switching power supply

Abstract

The utility model relates to a PCB (printed circuit board) wiring structure of a high-efficiency three-interlaced LLC (logical link control) switching power supply, which comprises two PCBs and a bus bar group, the two PCBs are stacked up and down, a resonance rectifying circuit comprises a transformer A-side rectifying circuit and a transformer B-side rectifying circuit which are arranged in parallel, and the bus bar group is connected with the transformer A-side rectifying circuit and the transformer B-side rectifying circuit. The transformer A-side rectifying circuit and the transformer B-side rectifying circuit are respectively arranged on the two PCBs; and the bus bar group is used for electrically connecting the output ends of the transformer A-side rectifying circuit and the transformer B-side rectifying circuit. The main output transformer T1 is divided into a surface A and a surface B, secondary winding pins are led out from the two surfaces, and output current is equally divided into six paths to be output, so that the current density of the current on the secondary winding of the transformer T1 is reduced, the magnetic induction area of the transformer is increased, the heat of the transformer is dispersed, the conversion efficiency of the transformer is improved, and the temperature rise heat loss of the transformer is reduced. And as the loss of the power device is reduced, the energy efficiency ratio of the power supply is improved, and larger power output can be realized by the same volume.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field, concretely relates to a high -efficient three interleaved LLC switching power supply's PCB board wiring structure. BACKGROUND

[0002] The existing AI server operation equipment uses a fixed voltage switching power supply for power supply, and the AI server operation equipment uses a switching power supply as shown in the drawing, and the adopted architecture is mainly an electromagnetic interference filter (EMI), a rectifier filter circuit, a PFC BOOST boost circuit, a power conversion circuit, an output rectifier filter circuit and a control circuit to achieve the required output voltage. Figure 1 Because the LLC resonant half-bridge circuit can realize zero-voltage switching, especially when the actual working frequency of the converter is equal to the resonant frequency set by the converter, the efficiency is the highest, and the switching loss of the device is the lowest, so the LLC resonant half-bridge circuit is widely used in the current AI server operation equipment switching power supply. When the switching frequency is equal to the resonant frequency, the LLC half-bridge resonant converter works in a complete resonant state, and the primary side switching tube can realize zero-voltage switching, eliminating the loss caused by the switching of the MOSFET tube. The secondary side rectifier diode works in a critical current mode, realizing zero-current switching of the rectifier diode, and eliminating the loss caused by the reverse recovery of the diode.

[0003] Because the output voltage of the current AI server operation equipment switching power supply is usually 12V, with the increasing power density, the output current is also increasing, and the magnetic induction current demand on a single transformer is also increasing, resulting in lower and lower efficiency and more and more difficult temperature processing, which has a more urgent demand for optimization design.

[0004] At the same time, in order to ensure the design redundancy of the power supply, the AI server operation equipment switching power supply can only increase the number of power supplies to meet the demand. In the conventional AI server operation equipment power supply system, the AI server operation equipment power supply system frame position is limited, and the volume of the whole equipment is also developing towards miniaturization, so the larger and larger equipment switching power supply cannot adapt to the development trend of equipment miniaturization. UTILITY MODEL CONTENTS

[0005] Therefore, it is necessary to provide a high-efficiency three-interleaved LLC switching power supply PCB board wiring structure with small power loss, high power efficiency and simple circuit structure.

[0006] The application discloses a PCB wiring structure of a high-efficiency three-interleaved LLC switching power supply, and relates to the technical field of switching power supplies.

[0007] Preferably, the output terminal group is arranged at the output end of the transformer A-face rectifier circuit, and the bus bar group is used for connecting the output end of the transformer B-face rectifier circuit to the output terminal group.

[0008] Preferably, the output terminal group comprises a positive output terminal CON1 and a negative output terminal CON2, and the bus bar group comprises a positive bus bar J1 and a negative bus bar J2; the positive bus bar J1 is used for connecting the positive output end of the transformer B-face rectifier circuit to the positive output terminal CON1, and the negative bus bar J2 is used for connecting the negative output end of the transformer B-face rectifier circuit to the negative output terminal CON2.

[0009] Preferably, the two PCB circuit boards comprise a first PCB circuit board and a second PCB circuit board, the transformer A-face rectifier circuit is arranged on the first PCB circuit board, and the transformer B-face rectifier circuit is arranged on the second PCB circuit board; the first PCB circuit board is arranged above the second PCB circuit board, and two ends of the positive bus bar J1 and the negative bus bar J2 are arranged on top surfaces of the first PCB circuit board and the second PCB circuit board, respectively, so as to connect the output ends of the transformer A-face rectifier circuit and the transformer B-face rectifier circuit.

[0010] Preferably, the resonant rectifier circuit comprises a transformer T1, the secondary side of the transformer T1 comprises two groups of secondary side output windings, the two groups of secondary side output windings comprise a first group of secondary side output windings and a second group of secondary side windings, the first group of secondary side output windings is arranged in the transformer A-face rectifier circuit, and the second group of secondary side output windings is arranged in the transformer B-face rectifier circuit.

[0011] Preferably, the first group of secondary side output windings comprises a first secondary side output winding T1-A, a second secondary side output winding T1-B and a third secondary side output winding T1-C, the high level pins of the first secondary side output winding T1-A, the second secondary side output winding T1-B and the third secondary side output winding T1-C are connected in Y type, the low level pins of the first secondary side output winding T1-A, the second secondary side output winding T1-B and the third secondary side output winding T1-C are connected to the output terminal group through a pair of rectifier tubes respectively.

[0012] Preferably, the output end of the transformer A face rectifier circuit is provided with a first filter capacitor C1, and the two ends of the first filter capacitor C1 are connected to the positive output terminal CON1 and the negative output terminal CON2 respectively.

[0013] Preferably, the second group of secondary side output windings comprises a fourth secondary side output winding T1-D, a fifth secondary side output winding T1-E and a sixth secondary side output winding T1-F, the high level pins of the fourth secondary side output winding T1-D, the fifth secondary side output winding T1-E and the sixth secondary side output winding T1-F are connected in Y type, the low level pins of the fourth secondary side output winding T1-D, the fifth secondary side output winding T1-E and the sixth secondary side output winding T1-F are connected to the output terminal group through a pair of rectifier tubes and the bus bar group respectively.

[0014] Preferably, the output end of the transformer B face rectifier circuit is provided with a second filter capacitor C2, and the two ends of the second filter capacitor C2 are connected to the positive output terminal CON1 and the negative output terminal CON2 through the positive bus bar J1 and the negative bus bar J2 respectively.

[0015] Preferably, the secondary side of the transformer T1 has six secondary side output windings, so that the secondary side output circuit of the transformer T1 is divided into six output circuits; the six secondary side output windings are evenly distributed in the transformer A face rectifier circuit and the transformer B face rectifier circuit, so as to reduce the current density in the secondary side winding of the transformer T1.

[0016] In the PCB wiring structure of the high-efficiency three-interleaved LLC switching power supply, the main output transformer T1 is divided into an A face and a B face, two plane secondary side winding pins are led out, the output current is divided into six output circuits, the current density in the secondary side winding of the transformer T1 is reduced, the magnetic induction area of the transformer is increased, the heat of the transformer is dispersed, the conversion efficiency of the transformer is improved, and the temperature rise heat loss of the transformer is reduced. Since the power device loss is reduced, the energy efficiency ratio of the power supply is improved, so that greater power output can be realized in the same volume. The circuit structure of the utility model is simple, easy to realize, low in cost and convenient to popularize. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the main output principle diagram of the AI server operation equipment switching power supply in the prior art.

[0018] Figure 2 is the circuit structure schematic diagram of the PCB wiring structure of the high-efficiency three-interleaved LLC switching power supply.

[0019] Figure 3 is the three-dimensional view of the PCB wiring structure of the high-efficiency three-interleaved LLC switching power supply. DETAILED DESCRIPTION

[0020] The utility model will be described in detail below in combination with specific embodiments and drawings.

[0021] Please refer to Figure 2 and Figure 3 , show a kind of high-efficiency three-interleaved LLC switching power supply's PCB wiring structure 100, three interleaved LLC switching power supply includes resonant rectifier circuit, including two PCB circuit boards and bus bar group, two described PCB circuit boards are stacked and arranged, the resonant rectifier circuit includes the transformer A face rectifier circuit and transformer B face rectifier circuit arranged in parallel, the transformer A face rectifier circuit and the transformer B face rectifier circuit are respectively arranged on two described PCB circuit boards;The bus bar group is used to electrically connect the output end of the transformer A face rectifier circuit and the transformer B face rectifier circuit.

[0022] Preferably, the output end of the resonant rectifier circuit is provided with an output terminal group, the output terminal group is arranged on the output end of the transformer A face rectifier circuit, and the bus bar group connects the output end of the transformer B face rectifier circuit to the output terminal group.

[0023] Preferably, the output terminal group includes a positive output terminal CON1 and a negative output terminal CON2, and the bus bar group includes a positive bus bar J1 and a negative bus bar J2;The positive bus bar J1 is used to connect the positive output end of the transformer B face rectifier circuit and the positive output terminal CON1, and the negative bus bar J2 is used to connect the negative output end of the transformer B face rectifier circuit and the negative output terminal CON2.

[0024] Preferably, the two PCB circuit boards include a first PCB circuit board 30 and a second PCB circuit board 40, the transformer A-side rectifier circuit is arranged on the first PCB circuit board 30, and the transformer B-side rectifier circuit is arranged on the second PCB circuit board 40; the first PCB circuit board 30 is arranged above the second PCB circuit board 40, and two ends of the positive bus bar J1 and the negative bus bar J2 are respectively arranged on top surfaces of the first PCB circuit board 30 and the second PCB circuit board 40 to connect output terminals of the transformer A-side rectifier circuit and the transformer B-side rectifier circuit.

[0025] Preferably, the resonant rectifier circuit includes a transformer T1, a secondary side of the transformer T1 includes two groups of secondary side output windings, the two groups of secondary side output windings include a first group of secondary side output windings and a second group of secondary side windings, the first group of secondary side output windings is arranged in the transformer A-side rectifier circuit, and the second group of secondary side output windings is arranged in the transformer B-side rectifier circuit.

[0026] Preferably, the secondary side of the transformer T1 has six secondary side output windings, so that the secondary side output circuit of the transformer T1 is divided into six output circuits; the six secondary side output windings are evenly distributed to the transformer A-side rectifier circuit and the transformer B-side rectifier circuit to reduce the current density in the secondary side winding of the transformer T1.

[0027] Preferably, the first group of secondary side output windings includes a first secondary side output winding T1-A, a second secondary side output winding T1-B, and a third secondary side output winding T1-C, high-level pins of the first secondary side output winding T1-A, the second secondary side output winding T1-B, and the third secondary side output winding T1-C are connected in a Y shape, low-level pins of the first secondary side output winding T1-A, the second secondary side output winding T1-B, and the third secondary side output winding T1-C are respectively connected to the output terminal group through a pair of rectifier tubes. The output terminal of the transformer A-side rectifier circuit is provided with a first filter capacitor C1, and two ends of the first filter capacitor C1 are respectively connected to the positive output terminal CON1 and the negative output terminal CON2.

[0028] Preferably, the second group of secondary side output windings comprises a fourth secondary side output winding T1-D, a fifth secondary side output winding T1-E and a sixth secondary side output winding T1-F, the high level pins of the fourth secondary side output winding T1-D, the fifth secondary side output winding T1-E and the sixth secondary side output winding T1-F are connected in Y type, the low level pins of the fourth secondary side output winding T1-D, the fifth secondary side output winding T1-E and the sixth secondary side output winding T1-F are connected to the output terminal group through a pair of rectifier tubes and the bus bar group respectively. The output end of the transformer B face rectifier circuit is provided with a second filter capacitor C2, and the two ends of the second filter capacitor C2 are connected to the positive output terminal CON1 and the negative output terminal CON2 through the positive bus bar J1 and the negative bus bar J2 respectively.

[0029] Specifically, in the present embodiment, the principle of the wiring structure of the high-efficiency three-interleaved LLC switching power supply is as shown in the figure Figure 2 The transformer secondary side A face outputs three windings T1-A, T1-B, T1-C, the transformer secondary side high level pins are connected in Y type, and the transformer secondary side low level pins are connected to the output rectifier tube rectification filter and the output terminal. The transformer secondary side B face outputs three windings T1-D, T1-E, T1-F, the transformer secondary side high level pins are connected in Y type, and the transformer secondary side low level pins are connected to the output rectifier tube rectification filter and the output terminal.

[0030] The transformer A face output secondary side windings T1-A, T1-B, T1-C are connected to the first PCB circuit board 30 through a pair of pins respectively, the high level ends of T1-A, T1-B, T1-C are pins 1, 3, 5 respectively, and the low level ends are pins 2, 4, 6 respectively, the low level end of each secondary side winding is connected to a pair of synchronous rectifier tubes, wherein the pin 1 of T1-A is connected to the second synchronous rectifier tube Q2 and the third synchronous rectifier tube Q3, the pin 4 of T1-B is connected to the fifth synchronous rectifier tube Q5 and the sixth synchronous rectifier tube Q6, and the pin 6 of T1-C is connected to the first synchronous rectifier tube Q1 and the fourth synchronous rectifier tube Q4, the output synchronous rectifier tubes Q1-Q6 on the first PCB circuit board 30 are connected to the first filter capacitor C1, the positive electrode of the first filter capacitor C1 is connected to the positive output terminal CON1, and the negative electrode of the first filter capacitor C1 is connected to the negative output terminal CON2.

[0031] The secondary windings T1-D, T1-E, and T1-F from the B side of the transformer are each connected to the second PCB circuit board 40 via a pair of pins. The high-level terminals of T1-D, T1-E, and T1-F are pins 7, 9, and 11, respectively, and the low-level terminals are pins 8, 10, and 12, respectively. The low-level terminal of each secondary winding is connected to a pair of synchronous rectifier diodes. Specifically, pin 7 of T1-D is connected to the seventh synchronous rectifier diode Q7 and the eighth synchronous rectifier diode Q8, pin 10 of T1-E is connected to the eleventh synchronous rectifier diode Q11 and the twelfth synchronous rectifier diode Q12, and pin 12 of T1-F is connected to the ninth synchronous rectifier diode Q9 and the tenth synchronous rectifier diode Q10. The output synchronous rectifier diodes Q7 to Q12 on the second PCB circuit board 40 are connected to the second filter capacitor C2. The positive terminal of the second filter capacitor C2 is connected to the positive output terminal CON1 via the positive bus bar J1, and the negative terminal of the second filter capacitor C2 is connected to the negative output terminal CON2 via the negative bus bar J2.

[0032] like Figure 3 As shown, when transformer T1 operates in the positive half-cycle, the output current is connected to the first PCB circuit board 30 through pins 1, 3, and 5. The current is evenly distributed across the three windings, rectified by output synchronous rectifiers Q1 to Q6, filtered by the first output filter capacitor C1, and output to the positive output terminal CON1. ​​After flowing through the output load device, it returns to the negative output terminal CON2, then through the negative terminal of the first filter capacitor C1 and the output synchronous rectifiers Q1 to Q6, returning to the low-end pins 2, 4, and 6 of transformer T1, thus forming a circuit. When transformer T1 operates in the negative half-cycle, the output current is connected to the first PCB circuit board 30 through pins 2, 4, and 6. The current is evenly distributed among the three windings, passes through the output synchronous rectifier tubes Q1 to Q6 and the negative terminal of the first filter capacitor C1, and is output to the negative output terminal CON2. After flowing through the output load device, it returns to the positive output terminal CON1. ​​It is filtered by the positive terminal of the first output filter capacitor C1 on the first PCB circuit board 30, and then returns to the high-side pins 1, 3, and 5 of transformer T1 through the output synchronous rectifier tubes Q1 to Q6 on the first PCB circuit board 30, thus forming a loop.

[0033] When the B face of the transformer T1 works in the positive half cycle, the output current is connected to the second PCB circuit board 40 through the 7, 9, 11 pins, the current is divided into three windings, and is rectified and output through the output synchronous rectifier Q7-Q12, filtered through the second filter capacitor C2, and output to the positive output terminal CON1 on the first PCB circuit board 30 through the positive bus bar J1. After flowing through the output load device, the current returns to the negative output terminal CON2, is output to the second PCB circuit board 40 through the negative bus bar J2, and returns to the low end 8, 10, 12 pins of the transformer T1 through the negative pole of the second filter capacitor C2 and the output synchronous rectifier Q7-Q12, thereby forming a loop. When the B face of the transformer T1 works in the negative half cycle, the output current is connected to the second PCB circuit board 40 through the 8, 10, 12 pins, the current is divided into three windings, and is rectified and output through the output synchronous rectifier Q7-Q12, filtered through the second filter capacitor C2, and output to the negative output terminal CON2 on the first PCB circuit board 30 through the negative bus bar J2. After flowing through the output load device, the current returns to the positive output terminal CON1, is output to the second PCB circuit board 40 through the positive bus bar J1, and returns to the high end 7, 9, 11 pins of the transformer T1 through the positive pole of the second filter capacitor C2 and the output synchronous rectifier Q7-Q12 on the second PCB circuit board 40, thereby forming a loop.

[0034] In the PCB wiring structure 100 of the high-efficiency three-interleaved LLC switching power supply in the embodiment, the output current is divided into six paths, the current density of the secondary winding of the transformer T1 is reduced, the magnetic induction area of the transformer is increased, the heat of the transformer is dispersed, the conversion efficiency of the transformer is improved, the temperature rise heat loss of the transformer is reduced, the power conversion efficiency is high, the same volume can realize greater power output, the switching power supply can be kept safe, efficient and stable, the dynamic redundancy of the power supply is guaranteed, the energy efficiency ratio is improved, and energy is saved.

[0035] In the PCB wiring structure 100 of the high-efficiency three-interleaved LLC switching power supply in the embodiment, the output part of the switching power supply power converter can reduce the current density of the secondary winding of the transformer T1, increase the magnetic induction area of the transformer, disperse the heat of the transformer, improve the conversion efficiency of the transformer, reduce the temperature rise heat loss of the transformer, and the power device loss is small, the energy efficiency ratio of the power supply is high, the same volume can realize greater power output, the switching power supply can be kept safe, efficient and stable, the dynamic redundancy of the power supply is guaranteed, the energy efficiency ratio is improved, and energy is saved.

[0036] It should be noted that the utility model is not limited to the above-mentioned embodiments, and other changes can be made by those skilled in the art according to the creative spirit of the utility model, and the changes made according to the creative spirit of the utility model should be included in the scope of protection claimed by the utility model.

Claims

1. A PCB layout structure of a high efficiency three interleaved LLC switching power supply including a resonant rectifier circuit, characterized by, The resonant rectifier circuit comprises two PCB circuit boards and a bus bar group, the two PCB circuit boards are arranged in a stacked manner, the resonant rectifier circuit comprises a transformer A face rectifier circuit and a transformer B face rectifier circuit arranged in parallel, the transformer A face rectifier circuit and the transformer B face rectifier circuit are arranged on the two PCB circuit boards respectively, and the bus bar group is used for electrically connecting output ends of the transformer A face rectifier circuit and the transformer B face rectifier circuit.

2. The PCB layout structure of the high efficiency three-interleaved LLC switching power supply according to claim 1, wherein, The output end of the resonant rectifier circuit is provided with an output terminal group, the output terminal group is arranged at the output end of the transformer A face rectifier circuit, and the bus bar group connects the output end of the transformer B face rectifier circuit to the output terminal group.

3. The PCB layout structure of the high efficiency three-interleaved LLC switching power supply of claim 2, wherein, The output terminal group comprises a positive output terminal CON1 and a negative output terminal CON2, the bus bar group comprises a positive bus bar J1 and a negative bus bar J2, the positive bus bar J1 is used for connecting a positive output end of the transformer B face rectifier circuit and the positive output terminal CON1, and the negative bus bar J2 is used for connecting a negative output end of the transformer B face rectifier circuit and the negative output terminal CON2.

4. The PCB layout structure of the high efficiency three-interleaved LLC switching power supply of claim 3, wherein, The two PCB circuit boards comprise a first PCB circuit board and a second PCB circuit board, the transformer A face rectifier circuit is arranged on the first PCB circuit board, the transformer B face rectifier circuit is arranged on the second PCB circuit board, the first PCB circuit board is arranged above the second PCB circuit board, and two ends of the positive bus bar J1 and the negative bus bar J2 are arranged on top surfaces of the first PCB circuit board and the second PCB circuit board respectively to connect the output ends of the transformer A face rectifier circuit and the transformer B face rectifier circuit.

5. The PCB layout structure of the high efficiency three-interleaved LLC switching power supply of claim 3, wherein, The resonant rectifier circuit comprises a transformer T1, a secondary side of the transformer T1 comprises two groups of secondary side output windings, the two groups of secondary side output windings comprise a first group of secondary side output windings and a second group of secondary side windings, the first group of secondary side output windings are arranged in the transformer A face rectifier circuit, and the second group of secondary side output windings are arranged in the transformer B face rectifier circuit.

6. The PCB layout structure of the high efficiency three-interleaved LLC switching power supply of claim 5, wherein, The first group of secondary side output windings comprises a first secondary side output winding T1-A, a second secondary side output winding T1-B and a third secondary side output winding T1-C, high-level pins of the first secondary side output winding T1-A, the second secondary side output winding T1-B and the third secondary side output winding T1-C are connected in a Y shape, low-level pins of the first secondary side output winding T1-A, the second secondary side output winding T1-B and the third secondary side output winding T1-C are connected to the output terminal group through a pair of rectifier tubes respectively.

7. The PCB layout structure of the high efficiency three-interleaved LLC switching power supply of claim 5, wherein, The output end of the transformer A face rectifier circuit is provided with a first filter capacitor C1, and two ends of the first filter capacitor C1 are connected to the positive output terminal CON1 and the negative output terminal CON2 respectively.

8. The PCB layout structure of the high efficiency three-interleaved LLC switching power supply of claim 5, wherein, The second group of secondary side output windings comprises a fourth secondary side output winding T1-D, a fifth secondary side output winding T1-E and a sixth secondary side output winding T1-F, high level pins of the fourth secondary side output winding T1-D, the fifth secondary side output winding T1-E and the sixth secondary side output winding T1-F are connected in Y type, low level pins of the fourth secondary side output winding T1-D, the fifth secondary side output winding T1-E and the sixth secondary side output winding T1-F are connected to the output terminal group through a pair of rectifier tubes and the bus bar group respectively.

9. The PCB layout structure of the high efficiency three-interleaved LLC switching power supply of claim 5, wherein, The output end of the transformer B face rectifier circuit is provided with a second filter capacitor C2, two ends of the second filter capacitor C2 are connected to the positive output terminal CON1 and the negative output terminal CON2 through the positive bus bar J1 and the negative bus bar J2 respectively.

10. The PCB layout structure of the high efficiency three-interleaved LLC switching power supply of claim 5, wherein, The secondary side of the transformer T1 has six secondary side output windings, so that the secondary side output circuit of the transformer T1 is divided into six output circuits; the six secondary side output windings are evenly distributed in the transformer A face rectifier circuit and the transformer B face rectifier circuit, so as to reduce the current density in the secondary side winding of the transformer T1.

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