Direct current printed circuit board of charging module

Abstract

The utility model discloses a DC printed circuit board of a charging module, and belongs to the field of circuit board design. The circuit board includes first, second and third printed areas. The first printing area is provided with an output filter capacitor, a relay, a rectifier diode and a safety capacitor, controls a current switch and provides electrical safety protection. The second printing area forms a filter circuit through a two-stage filter inductor and a two-stage filter capacitor, output ripples are reduced, electromagnetic compatibility is improved, an anti-reverse diode and a CAN communication circuit are further included, and safety and the communication function are enhanced. And the third printing area comprises an input port, a filter capacitor, a full-bridge resonant switch tube, a power device, a resonant capacitor, a resonant inductor and a current sampling circuit, and is controlled through a DSP module, and the power conversion efficiency is optimized. The design effectively improves the power density, the current control, the electromagnetic compatibility and the safety, and is suitable for an efficient and stable high-power direct-current charging pile.

Description

TECHNICAL FIELD

[0001] The application relates to the field of circuit board design, in particular to a charging module direct-current printed circuit board. BACKGROUND

[0002] With the rapid development of the electric vehicle market, the demand for charging facilities is increasing, especially in the field of charging piles. Traditional alternating current charging piles are difficult to meet the demand for fast charging due to long charging time and low power. Therefore, direct current charging piles have emerged as the times require, which not only provides higher charging power, but also significantly shortens the charging time and reduces the waiting time of users. Especially in the field of high-power direct current charging piles, the charging speed and efficiency have been significantly improved, becoming one of the main trends of current electric vehicle charging technology.

[0003] However, in the prior art, although the direct current charging pile has high power output, there are still some deficiencies in the circuit design, especially in stability, electromagnetic compatibility and heat dissipation performance. The traditional circuit layout usually causes uneven distribution of current, low power density, large output voltage ripple and electromagnetic interference problems, which will affect the working efficiency and safety of the charging pile.

[0004] In view of these problems, in recent years, interleaved LLC circuit layout has gradually become an effective solution to optimize the design of charging piles. By adopting interleaved LLC layout, the stability, safety of the charging pile can be greatly improved, and the output voltage ripple and electromagnetic interference can be effectively reduced. At the same time, this layout design can improve the power factor and system efficiency, improve the overall performance of the circuit, especially in high-power charging modules.

[0005] The technical scheme provides a new type of 60KW charging module DC / DC circuit board layout, which not only optimizes the working efficiency of the circuit, but also improves the heat dissipation performance and electromagnetic compatibility, providing a more superior solution for efficient, stable and safe direct current charging system. CONTENT OF THE UTILITY MODEL

[0006] The utility model provides a kind of charging module direct-current printed circuit board. The above-mentioned problems existing in the related art can be solved. The technical scheme is as follows:

[0007] The application provides a charging module direct-current printed circuit board, comprising:

[0008] The first printed area is provided with an output filter capacitor, a relay 9, a rectifier diode and a first area safety capacitor, the output filter capacitor is placed on the left side of the relay 9 and connected with the rectifier diode, the relay 9 is used for controlling the switch of current, and the first area safety capacitor is used for providing electrical safety protection.

[0009] A second printed area is arranged below the first printed area and connected with the first printed area through a line, the second printed area is provided with two-stage filter inductance, two-stage filter capacitance, a discharge circuit 26, a CAN communication circuit 28, a reverse prevention diode, an LLC output terminal 17 and a second area safety capacitor, the two-stage filter inductance and the two-stage filter capacitance form a two-stage filter circuit, the reverse prevention diode is arranged in a current reverse flow path to ensure safety when multiple units are connected in parallel, and the second area safety capacitor is used for filtering for the CAN communication circuit 28 and the discharge circuit 26;

[0010] A third printed area is arranged to the right of the first printed area and connected with the first printed area and the second printed area through a line, the third printed area is provided with an input port, a filter capacitor, a full-bridge resonant upper bridge switch tube device, a full-bridge resonant lower bridge switch tube device, a power device, a resonant capacitor, a resonant inductor, an output transformer, a current sampling circuit and a DSP module 75, wherein the resonant inductor is connected with the resonant capacitor and the output transformer to form a resonant cavity.

[0011] Optionally, in the third printed area, the input port includes a first input port 72 and a second input port 73.

[0012] The filter capacitor includes a first filter capacitor 69, a second filter capacitor 70 and a third filter capacitor 71 connected with the first input port 72, and a fourth filter capacitor 57, a fifth filter capacitor 58 and a sixth filter capacitor 59 connected with the second input port 73.

[0013] Optionally, the full-bridge resonant upper bridge switch tube device includes a first upper bridge switch tube 60, a second upper bridge switch tube 61 and a third upper bridge switch tube 62, and the full-bridge resonant lower bridge switch tube device includes a first lower bridge switch tube 63, a second lower bridge switch tube 64 and a third lower bridge switch tube 65, wherein the working phase difference between the first upper bridge switch tube 60, the second upper bridge switch tube 61 and the third upper bridge switch tube 62 is 120°.

[0014] The power device is sequentially provided with a first absorption capacitor 66, a second absorption capacitor 67 and a third absorption capacitor 68 therebetween;

[0015] The full-bridge resonant upper bridge switch tube device and the full-bridge resonant lower bridge switch tube device are controlled by the DSP module 75 to switch, and voltage and current detection is performed by upper and lower bridge arm control;

[0016] The resonant capacitor adopts an interleaved high technology, wherein the resonant capacitor includes a first resonant capacitor 41, a second resonant capacitor 43, a third resonant capacitor 45, a fourth resonant capacitor 47, a fifth resonant capacitor 49 and a sixth resonant capacitor 51.

[0017] Optionally, in the third printed area,

[0018] The first upper bridge switch tube 60 is connected to a first resonant inductor 42 among the resonant inductors;

[0019] The second upper bridge switch tube 61 is connected to a second resonant inductor 44 among the resonant inductors;

[0020] The third upper bridge switch tube 62 is connected to a third resonant inductor 46 among the resonant inductors;

[0021] The first lower bridge switch tube 63 is connected to a fourth resonant inductor 48 among the resonant inductors;

[0022] The second lower bridge switch tube 64 is connected to a fifth resonant inductor 50 among the resonant inductors;

[0023] The third lower bridge switch tube 65 is connected to a sixth resonant inductor 52 among the resonant inductors.

[0024] Optionally, in the third printed area,

[0025] The resonant capacitors include a first resonant capacitor 41, a second resonant capacitor 43, a third resonant capacitor 45, a fourth resonant capacitor 47, a fifth resonant capacitor 49 and a sixth resonant capacitor 51;

[0026] The output transformers include a first output transformer 29 / 30, a second output transformer 31 / 32, a third output transformer 33 / 34, a fourth output transformer 35 / 36, a fifth output transformer 37 / 38 and a sixth output transformer 39 / 40.

[0027] Optionally, a first current sampling circuit 53 among the current sampling circuits is connected to the second resonant inductor 44; a second current sampling circuit 54 among the current sampling circuits is connected to the third resonant inductor 46; a third current sampling circuit 55 among the current sampling circuits is connected to the fifth resonant inductor 50; and a fourth current sampling circuit 56 among the current sampling circuits is connected to the sixth resonant inductor 52.

[0028] Optionally, the second printed area further includes an auxiliary power connection terminal 27 and an auxiliary power circuit 74 controlled by the DSP module 75, the auxiliary power connection terminal 27 supplies power to the auxiliary power circuit 74 and communicates with the DSP module 75;

[0029] The third printed area is in front of a PFC and is provided with EMI filtering components, and the auxiliary power circuit 74 is used to change the voltage from the PFC into a stable voltage and supply power to the DSP module 75;

[0030] The CAN communication circuit 28 is connected with the DSP module 75, and the CAN communication circuit 28 is used for communication between the DSP module 75 and the upper computer.

[0031] The third printed area further comprises a temperature acquisition circuit 76, which is used for processing the temperature from the temperature sensor on the first upper bridge switch tube 60, the second upper bridge switch tube 61, the third upper bridge switch tube 62, the first lower bridge switch tube 63, the second lower bridge switch tube 64 and the third lower bridge switch tube 65 and sending the temperature into the DSP module 75.

[0032] Optionally, the first printed area is provided with the relay 9 from right to left, the third printed area is correspondingly provided with a relay control circuit 18, the relay 9 is connected with the relay control circuit 18 and controlled by the DSP module 75.

[0033] The rectifier diodes are arranged below the relay 9, and from top to bottom, the rectifier diodes are the first upper bridge rectifier diode 10, the second upper bridge rectifier diode 11, the first lower bridge rectifier diode 12 and the second lower bridge rectifier diode 13.

[0034] The output filter capacitors are arranged on the left side of the relay 9.

[0035] The first output filter capacitor 1, the second output filter capacitor 2, the third output filter capacitor 3 and the fourth output filter capacitor 4 in the output filter capacitors are connected with the first upper bridge rectifier diode 10 and the second upper bridge rectifier diode 11 respectively.

[0036] The fifth output filter capacitor 5, the sixth output filter capacitor 6, the seventh output filter capacitor 7 and the eighth output filter capacitor 8 in the output filter capacitors are connected with the first lower bridge rectifier diode 12 and the second lower bridge rectifier diode 13.

[0037] The first area safety capacitor comprises a first capacitor 14 and a second capacitor 15 connected with the bus and the ground.

[0038] Optionally, in the second printed area, the two-stage filter inductors comprise a first-stage filter common-mode inductor 20 and a second-stage filter common-mode inductor 19, and the two-stage filter capacitors comprise a first-stage filter capacitor 21 and a second-stage filter capacitor 22.

[0039] The first-stage filter common-mode inductor 20 is connected with the first output filter capacitor 1, the second output filter capacitor 2, the third output filter capacitor 3 and the fourth output filter capacitor 4, the fifth output filter capacitor 5, the sixth output filter capacitor 6, the seventh output filter capacitor 7 and the eighth output filter capacitor 8 in the first printed area respectively.

[0040] The first stage filter common mode inductor 20 is also connected with the differential mode inductor 25 arranged in the second printed area, the first stage filter capacitor 21 and the second stage filter capacitor 22.

[0041] Optionally, in the second printed area, the anti-reverse diode is arranged below the differential mode inductor 25.

[0042] The anti-reverse diode comprises a first anti-reverse diode 23 and a second anti-reverse diode 24, which are connected with the differential mode inductor 25, and the first anti-reverse diode 23 and the second anti-reverse diode 24 are also connected with the second stage filter common mode inductor 19.

[0043] The LLC output terminal 17 is connected with the second stage filter common mode inductor 19.

[0044] The discharge circuit 26 is connected with and controlled by the DSP module 75 in the third printed area.

[0045] The second area safety capacitor comprises a third capacitor 16 and a fourth capacitor 77.

[0046] The technical scheme provided by the utility model has at least the following beneficial effects:

[0047] The utility model discloses a charging module direct current printed circuit board belongs to the field of circuit board design, the charging module direct current printed circuit board includes first printed area, second printed area and third printed area. First printed area is equipped with output filter capacitor, relay, rectifier diode and first area safety capacitor, and the switch of ensuring electrical safety protection and control current. The second printed area is through two stage filter inductor and capacitor constitutes two stage filter circuit, effectively reduces the output ripple and improves electromagnetic compatibility. The second printed area still includes anti-reverse diode and CAN communication circuit, and the safety and communication ability of system are enhanced. The third printed area is equipped with input port, filter capacitor, full bridge resonant switch tube device, power device, resonant capacitor, resonant inductance and current sampling circuit etc., constitutes high -efficient resonant cavity, and through the accurate control and monitoring of DSP module, the power conversion efficiency is optimized. The design has remarkable advantage in the improvement power density, optimization current control, enhancement electromagnetic compatibility and safety, is applicable to the high -efficient stable high -power direct current charging pile. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical scheme in the utility model, the following will be to the drawing needed to be used in the embodiment description briefly introduced, obviously, the drawing in the following description only some embodiments of the application, for ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0049] Figure 1 Fig. 1 is a structural schematic diagram of a direct-current printed circuit board of a charging module according to an illustrative embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0051] Embodiment 1

[0052] Please refer to Figure 1 Fig. 1 is a structural schematic diagram of a direct-current printed circuit board of a charging module according to an illustrative embodiment of the present application.

[0053] Figure 1 The direct-current printed circuit board of the charging module shown in Fig. 1 comprises a first printed area, a second printed area and a third printed area.

[0054] The first printed area is provided with an output filter capacitor, a relay 9, a rectifier diode and a first-area safety capacitor. The output filter capacitor is placed at the left side of the relay 9 and connected with the rectifier diode. The relay 9 is used for controlling the switching of current. The first-area safety capacitor is used for providing electrical safety protection.

[0055] The second printed area is arranged below the first printed area and connected with the first printed area through a circuit. The second printed area is provided with two-stage filter inductors, two-stage filter capacitors, a discharge circuit 26, a CAN communication circuit 28, a reverse prevention diode, an LLC output terminal 17 and a second-area safety capacitor. The two-stage filter inductors and the two-stage filter capacitors form a two-stage filter circuit. The reverse prevention diode is arranged in the path of current backflow to ensure safety when multiple machines are connected in parallel. The second-area safety capacitor is used for filtering the CAN communication circuit 28 and the discharge circuit 26.

[0056] The two-stage filter circuit is used for reducing output ripple and improving electromagnetic compatibility.

[0057] The third printed area is arranged at the right side of the first printed area and connected with the first printed area and the second printed area through a circuit. The third printed area is provided with an input port, a filter capacitor, full-bridge resonant upper bridge switch tube devices, full-bridge resonant lower bridge switch tube devices, power devices, resonant capacitors, resonant inductors, an output transformer, a current sampling circuit and a DSP module 75. The resonant inductors are connected with the resonant capacitors and the output transformer to form a resonant cavity.

[0058] In summary, according to the structural design in Embodiment 1, the layout of the direct-current printed circuit board of the charging module significantly improves the overall performance of the circuit, mainly in the following aspects.

[0059] The output ripple is reduced. The second printed area of Embodiment 1 employs two-stage filtering inductors and two-stage filtering capacitors, forming a high-efficiency two-stage filtering circuit that effectively reduces the output voltage ripple. This design not only ensures the stability of the power output but also optimizes electromagnetic compatibility, reduces electromagnetic interference, and improves the reliability of the entire circuit.

[0060] The electromagnetic compatibility is improved. The second printed area designs a combination of common-mode inductors, differential-mode inductors, and safety capacitors, further enhancing electromagnetic compatibility. These components can effectively filter out interference signals, ensuring stable operation of the circuit in complex electromagnetic environments and meeting strict electromagnetic compatibility requirements.

[0061] The current control and protection functions are optimized. The relay and rectifier diode in the first printed area effectively control current flow and provide electrical safety protection through the first-area safety capacitor. At the same time, the reverse diode in the second printed area prevents current backflow, ensuring the safety and reliability of the system when multiple units are connected in parallel.

[0062] The heat dissipation performance is optimized. Embodiment 1 avoids excessive compact arrangement of components through reasonable circuit layout, potentially improving heat dissipation. In addition, the reasonable distribution of capacitors and inductors in the second printed area avoids excessive current concentration, reducing thermal load.

[0063] As can be seen, Embodiment 1 significantly improves the electrical performance and reliability of the charging module through innovative circuit layout design. First, the use of two-stage filtering inductors and capacitors successfully reduces output ripple and effectively improves electromagnetic compatibility. Second, the reasonable layout of relays and rectifier diodes enhances current control and protection, ensuring electrical safety. By optimizing the design of capacitors and inductors, this embodiment improves the power density of the charging module and ensures stable operation of the device in complex electromagnetic environments by reducing electromagnetic interference. In addition, the design of reasonable current backflow protection and heat dissipation potential helps to improve the stability and long-term reliability of the charging module.

[0064] Embodiment 2

[0065] Optionally, in the third printed area, the input port includes a first input port 72 and a second input port 73.

[0066] The filtering capacitors include a first filtering capacitor 69, a second filtering capacitor 70, and a third filtering capacitor 71 connected to the first input port 72, and a fourth filtering capacitor 57, a fifth filtering capacitor 58, and a sixth filtering capacitor 59 connected to the second input port 73.

[0067] Optionally, the full-bridge resonant upper bridge switch device includes a first upper bridge switch 60, a second upper bridge switch 61 and a third upper bridge switch 62, and the full-bridge resonant lower bridge switch device includes a first lower bridge switch 63, a second lower bridge switch 64 and a third lower bridge switch 65, wherein the working phase difference between the first upper bridge switch 60, the second upper bridge switch 61 and the third upper bridge switch 62 is 120°.

[0068] The power device is sequentially provided with a first absorption capacitor 66, a second absorption capacitor 67 and a third absorption capacitor 68.

[0069] The full-bridge resonant upper bridge switch device and the full-bridge resonant lower bridge switch device are controlled by a DSP module 75 to switch, and voltage and current detection is performed by upper and lower bridge arm control.

[0070] The resonant capacitor adopts staggered high technology, wherein the resonant capacitor includes a first resonant capacitor 41, a second resonant capacitor 43, a third resonant capacitor 45, a fourth resonant capacitor 47, a fifth resonant capacitor 49 and a sixth resonant capacitor 51.

[0071] Optionally, in the third printing area, the first upper bridge switch 60 is connected to the first resonant inductor 42 in the resonant inductor; the second upper bridge switch 61 is connected to the second resonant inductor 44 in the resonant inductor; the third upper bridge switch 62 is connected to the third resonant inductor 46 in the resonant inductor; the first lower bridge switch 63 is connected to the fourth resonant inductor 48 in the resonant inductor; the second lower bridge switch 64 is connected to the fifth resonant inductor 50 in the resonant inductor; and the third lower bridge switch 65 is connected to the sixth resonant inductor 52 in the resonant inductor.

[0072] Optionally, in the third printing area, the resonant capacitor includes a first resonant capacitor 41, a second resonant capacitor 43, a third resonant capacitor 45, a fourth resonant capacitor 47, a fifth resonant capacitor 49 and a sixth resonant capacitor 51; and the output transformer includes a first output transformer 29 / 30, a second output transformer 31 / 32, a third output transformer 33 / 34, a fourth output transformer 35 / 36, a fifth output transformer 37 / 38 and a sixth output transformer 39 / 40.

[0073] Optionally, in the current sampling circuit, a first current sampling circuit 53 is connected to the second resonant inductor 44; a second current sampling circuit 54 is connected to the third resonant inductor 46; a third current sampling circuit 55 is connected to the fifth resonant inductor 50; and a fourth current sampling circuit 56 is connected to the sixth resonant inductor 52.

[0074] Optionally, the second printing area further includes an auxiliary source connection terminal 27 and an auxiliary source circuit 74 controlled by the DSP module 75, and the auxiliary source connection terminal 27 supplies power to the auxiliary source circuit 74 and communicates with the DSP module 75.

[0075] The third printed area is in front of the PFC and is provided with EMI filter components to ensure good electromagnetic compatibility. The auxiliary source circuit 74 is used to convert the voltage from the PFC into a stable voltage and to supply power to the DSP module 75.

[0076] The CAN communication circuit 28 is connected to the DSP module 75, and the CAN communication circuit 28 is used to take charge of the communication between the DSP module 75 and the host computer.

[0077] The third printed area also includes a temperature acquisition circuit 76 for processing the temperature from the temperature sensors on the first upper bridge switch tube 60, the second upper bridge switch tube 61, the third upper bridge switch tube 62, the first lower bridge switch tube 63, the second lower bridge switch tube 64, and the third lower bridge switch tube 65 and sending the temperature to the DSP module 75.

[0078] Optionally, the first printed area is provided with a relay 9 from right to left, and the third printed area is correspondingly provided with a relay control circuit 18, and the relay 9 is connected to the relay control circuit 18 and controlled by the DSP module 75.

[0079] The rectifier diodes are arranged below the relay 9, and from top to bottom, they are the first upper bridge rectifier diode 10, the second upper bridge rectifier diode 11, the first lower bridge rectifier diode 12, and the second lower bridge rectifier diode 13.

[0080] The output filter capacitors are arranged on the left side of the relay 9. The first output filter capacitor 1, the second output filter capacitor 2, the third output filter capacitor 3, and the fourth output filter capacitor 4 in the output filter capacitors are connected to the first upper bridge rectifier diode 10 and the second upper bridge rectifier diode 11; the fifth output filter capacitor 5, the sixth output filter capacitor 6, the seventh output filter capacitor 7, and the eighth output filter capacitor 8 in the output filter capacitors are connected to the first lower bridge rectifier diode 12 and the second lower bridge rectifier diode 13.

[0081] The first area safety capacitor includes the first capacitor 14 and the second capacitor 15 connected to the bus and the ground.

[0082] Optionally, in the second printed area, the two-stage filter inductors include the first-stage filter common-mode inductor 20 and the second-stage filter common-mode inductor 19, and the two-stage filter capacitors include the first-stage filter capacitor 21 and the second-stage filter capacitor 22.

[0083] The first-stage filter common-mode inductor 20 is connected to the first output filter capacitor 1, the second output filter capacitor 2, the third output filter capacitor 3, and the fourth output filter capacitor 4, the fifth output filter capacitor 5, the sixth output filter capacitor 6, the seventh output filter capacitor 7, and the eighth output filter capacitor 8 in the first printed area, respectively.

[0084] The first-stage filter common-mode inductor 20 is also connected with the differential-mode inductor 25 arranged in the second printed area, the first-stage filter capacitor 21, and the second-stage filter capacitor 22.

[0085] Optionally, in the second printed area, the anti-reverse diodes are located below the differential-mode inductor 25. The anti-reverse diodes include the first anti-reverse diode 23 and the second anti-reverse diode 24 connected with the differential-mode inductor 25; the first anti-reverse diode 23 and the second anti-reverse diode 24 are also connected with the second-stage filter common-mode inductor 19.

[0086] The LLC output terminal 17 is connected with the second-stage filter common-mode inductor 19.

[0087] The discharge circuit 26 is connected with the DSP module 75 in the third printed area and is controlled by the DSP module 75.

[0088] The second-area safety capacitor includes the third capacitor 16 and the fourth capacitor 77.

[0089] In summary, the third printed area is further designed in detail in Embodiment 2, and the power switch device and the current detection system are mainly optimized, and the main technical effects are as follows.

[0090] The power density and efficiency are improved. In the third printed area, a full-bridge resonant design is adopted, multiple switch tubes (including the first upper bridge, the second upper bridge, and the third upper bridge switch tubes) and corresponding lower bridge switch devices are used, and the 120° phase difference is used for staggered operation. This staggered operation mode effectively reduces the voltage and current stress of the switch tube, reduces the power loss, and improves the conversion efficiency. In addition, the absorption capacitor effectively absorbs the reverse current in the switching process, further improving the stability of the system.

[0091] The current sampling and monitoring system is optimized. The current sampling circuit is distributed on different resonant inductors (such as the first current sampling circuit connected with the second resonant inductor), and this distributed sampling method improves the accuracy of current detection, helps to monitor the working state of the system in real time, ensures the uniform distribution of current in each resonant cavity, and avoids the occurrence of overload or imbalance. This not only enhances the reliability of the charging module, but also helps to realize current sharing control and optimize the stability of the power supply.

[0092] The electromagnetic compatibility is further optimized. The PFC (Power Factor Correction Circuit) is arranged in the front stage of the third printed area, and EMI filter components are equipped, which significantly improve the electromagnetic compatibility, reduce the interference of high-frequency noise, and ensure that the charging module can still work stably in a high-frequency environment.

[0093] The heat dissipation performance and space utilization are improved. The design of embodiment 2 adopts the staggered frame height process, which not only saves the space of the circuit board, but also effectively improves the heat dissipation performance. The reasonable layout of each resonant capacitor enables the heat to be evenly distributed, thereby preventing local overheating and improving the long-term stability of the equipment.

[0094] The temperature monitoring and protection mechanism is realized. In embodiment 2, the temperature acquisition circuit is integrated, and the working temperature of each switch tube is monitored by the temperature sensor and transmitted to the DSP module in real time for processing. This design effectively prevents overheating and improves the safety and protection capability of the system.

[0095] As can be seen, on the basis of embodiment 1, through the improvement in embodiment 2, the overall performance of the charging module is comprehensively improved, including power density, efficiency, current control, heat dissipation and electromagnetic compatibility, so that it performs more stably and reliably in the working environment of high power and high frequency current, and meets the design requirements of modern charging piles for efficient, safe and reliable power supply.

[0096] The above is only an optional embodiment of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A DC printed circuit board for a charging module, characterized in that, include: The first printing area is provided with an output filter capacitor, a relay (9), a rectifier diode and a first area safety capacitor. The output filter capacitor is placed to the left of the relay (9) and connected to the rectifier diode. The relay (9) is used to control the switching of the current. The first area safety capacitor is used to provide electrical safety protection. The second printing area is located below the first printing area and is connected to the first printing area via a line. The second printing area is provided with two-stage filter inductors, two-stage filter capacitors, a discharge circuit (26), a CAN communication circuit (28), a reverse protection diode, an LLC output terminal (17), and a second-zone safety capacitor. The two-stage filter inductors and the two-stage filter capacitors form a two-stage filter circuit. The reverse protection diode is placed in the current reverse flow path to ensure safety when multiple units are connected in parallel. The second-zone safety capacitor is used to filter the CAN communication circuit (28) and the discharge circuit (26). The third printing area is located to the right of the first printing area and is connected to the first printing area and the second printing area through a line. The third printing area is provided with an input port, a filter capacitor, a full-bridge resonant upper bridge switch device, a full-bridge resonant lower bridge switch device, a power device, a resonant capacitor, a resonant inductor, an output transformer, a current sampling circuit and a DSP module (75). The resonant inductor, the resonant capacitor and the output transformer are connected to form a resonant cavity.

2. The DC printed circuit board for the charging module according to claim 1, characterized in that, In the third printing area, the input port includes a first input port (72) and a second input port (73). The filter capacitors include a first filter capacitor (69), a second filter capacitor (70) and a third filter capacitor (71) connected to the first input port (72), and a fourth filter capacitor (57), a fifth filter capacitor (58) and a sixth filter capacitor (59) connected to the second input port (73).

3. The DC printed circuit board for the charging module according to claim 1, characterized in that, The full-bridge resonant upper bridge switching device includes a first upper bridge switching transistor (60), a second upper bridge switching transistor (61), and a third upper bridge switching transistor (62). The full-bridge resonant lower bridge switching device includes a first lower bridge switching transistor (63), a second lower bridge switching transistor (64), and a third lower bridge switching transistor (65). The first upper bridge switching transistor (60), the second upper bridge switching transistor (61), and the third upper bridge switching transistor (62) operate at a phase difference of 120°. The power device has a first absorption capacitor (66), a second absorption capacitor (67) and a third absorption capacitor (68) placed in the middle in sequence. The upper bridge switch and the lower bridge switch of the full-bridge resonant circuit are controlled by the DSP module (75), and voltage and current detection are performed by upper and lower bridge arm control. The resonant capacitors are constructed using an alternating stacking process. The resonant capacitors include a first resonant capacitor (41), a second resonant capacitor (43), a third resonant capacitor (45), a fourth resonant capacitor (47), a fifth resonant capacitor (49), and a sixth resonant capacitor (51).

4. The DC printed circuit board for the charging module according to claim 3, characterized in that, In the third printing area The first upper bridge switch (60) is connected to the first resonant inductor (42) in the resonant inductor; The second upper bridge switch (61) is connected to the second resonant inductor (44) in the resonant inductor; The third upper bridge switch (62) is connected to the third resonant inductor (46) in the resonant inductor. The first lower bridge switch (63) is connected to the fourth resonant inductor (48) in the resonant inductor; The second lower bridge switch (64) is connected to the fifth resonant inductor (50) in the resonant inductor; The third lower bridge switch (65) is connected to the sixth resonant inductor (52) in the resonant inductor.

5. The DC printed circuit board for the charging module according to claim 1, characterized in that, In the third printing area The resonant capacitors include a first resonant capacitor (41), a second resonant capacitor (43), a third resonant capacitor (45), a fourth resonant capacitor (47), a fifth resonant capacitor (49), and a sixth resonant capacitor (51). The output transformers include a first output transformer (29 / 30), a second output transformer (31 / 32), a third output transformer (33 / 34), a fourth output transformer (35 / 36), a fifth output transformer (37 / 38), and a sixth output transformer (39 / 40).

6. The DC printed circuit board for the charging module according to claim 4, characterized in that, The first current sampling circuit (53) in the current sampling circuit is connected to the second resonant inductor (44); the second current sampling circuit (54) in the current sampling circuit is connected to the third resonant inductor (46); the third current sampling circuit (55) in the current sampling circuit is connected to the fifth resonant inductor (50); and the fourth current sampling circuit (56) in the current sampling circuit is connected to the sixth resonant inductor (52).

7. The DC printed circuit board for the charging module according to claim 3, characterized in that, The second printing area also includes an auxiliary power connection terminal (27) and an auxiliary power circuit (74) controlled by the DSP module (75), wherein the auxiliary power connection terminal (27) supplies power to the auxiliary power circuit (74) and communicates with the DSP module (75); The third printing area is pre-amplified by a PFC and is equipped with EMI filter components. The auxiliary power supply circuit (74) is used to convert the voltage from the PFC into a stable voltage and power the DSP module (75). The CAN communication circuit (28) is connected to the DSP module (75), and the CAN communication circuit (28) is responsible for the communication between the DSP module (75) and the host computer. The third printing area also includes a temperature acquisition circuit (76), which processes the temperature transmitted from the temperature sensors on the first upper bridge switch (60), the second upper bridge switch (61), the third upper bridge switch (62), the first lower bridge switch (63), the second lower bridge switch (64), and the third lower bridge switch (65) and sends it to the DSP module (75).

8. The DC printed circuit board for the charging module according to claim 1, characterized in that, The first printing area is provided with the relay (9) from right to left, and the third printing area is provided with a relay control circuit (18). The relay (9) is connected to the relay control circuit (18) and controlled by the DSP module (75). The rectifier diodes are located below the relay (9), and from top to bottom they are the first upper bridge rectifier diode (10), the second upper bridge rectifier diode (11), the first lower bridge rectifier diode (12), and the second lower bridge rectifier diode (13). The output filter capacitor is located on the left side of the relay (9); The first output filter capacitor (1), the second output filter capacitor (2), the third output filter capacitor (3) and the fourth output filter capacitor (4) in the output filter capacitor are respectively connected to the first upper bridge rectifier diode (10) and the second upper bridge rectifier diode (11); The fifth output filter capacitor (5), the sixth output filter capacitor (6), the seventh output filter capacitor (7), and the eighth output filter capacitor (8) in the output filter capacitor are connected to the first lower bridge rectifier diode (12) and the second lower bridge rectifier diode (13). The first zone safety capacitor includes a first capacitor (14) and a second capacitor (15) connected to the busbar and ground.

9. The DC printed circuit board for the charging module according to claim 8, characterized in that, In the second printing area, the two-stage filter inductor includes a first-stage filter common-mode inductor (20) and a second-stage filter common-mode inductor (19), and the two-stage filter capacitor includes a first-stage filter capacitor (21) and a second-stage filter capacitor (22). The first-stage common-mode filter inductor (20) is connected to the first output filter capacitor (1), the second output filter capacitor (2), the third output filter capacitor (3), the fourth output filter capacitor (4), the fifth output filter capacitor (5), the sixth output filter capacitor (6), the seventh output filter capacitor (7), and the eighth output filter capacitor (8) of the first printed area, respectively. The first-stage common-mode filter inductor (20) is also connected to the differential-mode inductor (25), the first-stage filter capacitor (21), and the second-stage filter capacitor (22) provided in the second printed area.

10. The DC printed circuit board for the charging module according to claim 9, characterized in that, In the second printed area, the anti-reverse diode is located below the differential mode inductor (25); The anti-reverse diode includes a first anti-reverse diode (23) and a second anti-reverse diode (24) connected to the differential mode inductor (25); the first anti-reverse diode (23) and the second anti-reverse diode (24) are also connected to the second-stage filter common-mode inductor (19); The LLC output terminal (17) is connected to the second-stage filter common-mode inductor (19); The discharge circuit (26) is connected to and controlled by the DSP module (75) of the third printing area; The second zone safety capacitor includes a third capacitor (16) and a fourth capacitor (77).

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