Circuit board

Abstract

The embodiment of the utility model provides a circuit board. In the circuit board, the PCB comprises a first side edge and a second side edge which are opposite to each other and extend along a first direction, and a third side edge and a fourth side edge which are positioned between the first side edge and the second side edge, are opposite to each other and extend along a second direction. The first direct current bus capacitor is adjacent to the first side edge and the third side edge, the first direct current bus capacitor, the first EMC module and the alternating current input end are sequentially arranged on the PCB in the first direction, the first direct current bus capacitor, the PFC module and the DCDC module are sequentially arranged on the PCB in the second direction, and the DCDC module is adjacent to the third side edge and the second side edge. The DCDC module, the second DC bus capacitor, the second EMC module and the DC output end are sequentially arranged on the PCB in the first direction, and the first control circuit, the second control circuit and the auxiliary power supply are arranged between the first EMC module and the second EMC module. According to the invention, the power signal transmission path is shortened, the line loss is reduced, and the overall efficiency of power processing is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power electronics, and particularly relates to a circuit board. BACKGROUND

[0002] The on-board charger and the on-board DCDC (Direct Current to Direct Current) power supply are important components of a new energy electric vehicle. The on-board charger is mainly used for converting AC power from a power grid into DC power to charge a power battery of the new energy electric vehicle. Meanwhile, the on-board charger can convert the power of the power battery into AC power to provide power for an external load. The on-board charger has the function of bidirectional energy flow. The DCDC power supply is used for converting the power of the power battery of the new energy electric vehicle into low-voltage output to charge a low-voltage storage battery of the new energy electric vehicle. In order to improve the integration, the on-board charger and the on-board DCDC power supply are integrated into one complete product. The complete product has an independent cooling water channel and an IP67 or above protection level.

[0003] At present, the on-board charger and the on-board DCDC two-in-one power supply product are usually designed by using a plug-in power tube device. The plug-in power tube device is attached to a radiator and is usually cooled by a three-dimensional water channel. The power tube device has a large distribution area, which affects the volume of the complete product. Moreover, the area for water channel cooling is not conducive to the design and processing of the water channel. CONTENT OF THE INVENTION

[0004] The application embodiment provides a circuit board. The compact layout shortens the power signal transmission path, reduces the line loss, and improves the overall efficiency of power processing.

[0005] The embodiment of the present application provides a circuit board, which comprises a PCB (Printed Circuit Board), an alternating current input end, a first EMC (Electromagnetic Compatibility) module, a first direct current bus capacitor, a PFC (Power Factor Correction) module, a DCDC module, an auxiliary power supply, a first control circuit, a second control circuit, a second direct current bus capacitor, a second EMC module, and a direct current output end; the PCB comprises a first side edge and a second side edge opposite to each other and extending along a first direction, and a third side edge and a fourth side edge opposite to each other and extending along a second direction between the first side edge and the second side edge; the first direct current bus capacitor is adjacent to the first side edge and the third side edge, the first direct current bus capacitor, the first EMC module and the alternating current input end are sequentially arranged on the PCB along the first direction, the first direct current bus capacitor, the PFC module and the DCDC module are sequentially arranged on the PCB along the second direction, the DCDC module is adjacent to the third side edge and the second side edge, the DCDC module, the second direct current bus capacitor, the second EMC module and the direct current output end are sequentially arranged on the PCB along the first direction, and the first control circuit, the second control circuit and the auxiliary power supply are arranged between the first EMC module and the second EMC module.

[0006] In some embodiments, the PFC module comprises a first magnetic device connection port, a second magnetic device connection port and a PFC power tube; the first magnetic device connection port is adjacent to the third side edge, and the first magnetic device connection port, the PFC power tube and the second magnetic device connection port are sequentially arranged on the PCB along the first direction.

[0007] In some embodiments, the DCDC module comprises a third magnetic device connection port, a fourth magnetic device connection port, a DCDC primary side power tube, a DCDC secondary side power tube and a mutual inductor; the third magnetic device connection port is adjacent to the third side edge, the third magnetic device connection port and the fourth magnetic device connection port are arranged on the PCB along the second direction, the third magnetic device connection port and the DCDC primary side power tube are arranged on the PCB along the first direction, and the DCDC primary side power tube, the mutual inductor and the DCDC secondary side power tube are arranged on the PCB along the second direction.

[0008] In some embodiments, the circuit board further comprises a first resonant capacitor; the first resonant capacitor is arranged between the PFC module and the DCDC module.

[0009] In some embodiments, the circuit board further comprises a second resonant capacitor; the second resonant capacitor is adjacent to both the third side and the second side.

[0010] In some embodiments, the circuit board further comprises a first driving power supply; the first driving power supply is adjacent to the PFC module.

[0011] In some embodiments, the circuit board further comprises a second driving power supply; the second driving power supply is adjacent to the DCDC module.

[0012] In some embodiments, the circuit board further comprises an information interaction port; the information interaction port is disposed between the AC input end and the DC output end, and the information interaction port is adjacent to the second control circuit.

[0013] In some embodiments, the circuit board further comprises a control circuit interface; the control circuit interface is adjacent to the second control circuit, and the second control circuit is disposed along the second direction with the control circuit interface.

[0014] In some embodiments, the circuit board further comprises a surge protection and fuse circuit interface; the surge protection and fuse circuit interface is disposed between the AC input end and the first EMC module.

[0015] Different from the related technical solutions, the circuit board provided in the embodiment of the present application comprises a PCB board, an alternating current input end, a first EMC module, a first direct current bus capacitor, a PFC module, a DCDC module, an auxiliary power supply, a first control circuit, a second control circuit, a second direct current bus capacitor, a second EMC module, and a direct current output end. The PCB board comprises a first side edge and a second side edge opposite to each other and extending along a first direction, and a third side edge and a fourth side edge opposite to each other and extending along a second direction between the first side edge and the second side edge. The first direct current bus capacitor is adjacent to both the first side edge and the third side edge. The first direct current bus capacitor, the first EMC module, and the alternating current input end are sequentially arranged on the PCB board along the first direction. The first direct current bus capacitor, the PFC module, and the DCDC module are sequentially arranged on the PCB board along the second direction. The DCDC module is adjacent to both the third side edge and the second side edge. The DCDC module, the second direct current bus capacitor, the second EMC module, and the direct current output end are sequentially arranged on the PCB board along the first direction. The first control circuit, the second control circuit, and the auxiliary power supply are arranged between the first EMC module and the second EMC module. In the embodiment of the present application, the circuit layout of the alternating current input end, the first EMC module, the first direct current bus capacitor, the PFC module, the DCDC module, the second direct current bus capacitor, the second EMC module, and the direct current output end is reasonable. The alternating current power is first pretreated by the first EMC module and the first direct current bus capacitor, then enters the PFC module for power factor correction, and the utilization efficiency of the power supply is improved. Then, the DCDC module is used for direct current-direct current conversion, and the corrected direct current voltage is converted into a suitable output voltage. The compact layout shortens the power signal transmission path, reduces the line loss, and thus improves the overall efficiency of the power supply processing. The modules with more heat (such as the PFC module and the DCDC module) are concentrated near the third side edge, which can facilitate centralized heat dissipation. The external heat sink can effectively carry away the heat to reduce the risk of local overheating and improve the heat dissipation efficiency of the circuit board. BRIEF DESCRIPTION OF DRAWINGS

[0016] One or more embodiments are illustrated by way of example in the accompanying drawings that are not intended to be limiting of the embodiments. The same reference numbers in different drawings identify the same elements, and

[0017] Figure 1 is a structural schematic diagram of a circuit board provided in an embodiment of the present application;

[0018] Figure 2 is a structural schematic diagram of a circuit board provided in another embodiment of the present application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0020] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0021] When an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intervening elements.

[0022] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0023] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a circuit board 1000 provided in one embodiment of this application.

[0024] This application provides a circuit board 1000, which includes a PCB board 300, an AC input terminal 1, a first EMC module 3, a first DC bus capacitor 4, a PFC module 100, a DC-DC module 200, an auxiliary power supply 20, a first control circuit 21, a second control circuit 22, a second DC bus capacitor 11, a second EMC module 12, and a DC output terminal 13.

[0025] The PCB board 300 includes a first side 50 and a second side 60 that are opposite to each other and extend along a first direction A, and a third side 70 and a fourth side 80 that are located between the first side 50 and the second side 60, opposite to each other, and extend along a second direction B.

[0026] The first DC bus capacitor 4 is adjacent to the first side 50 and the third side 70, the first DC bus capacitor 4, the first EMC module 3 and the AC input end 1 are sequentially arranged on the PCB 300 along the first direction A, the first DC bus capacitor 4, the PFC module 100 and the DCDC module 200 are sequentially arranged on the PCB 300 along the second direction B, the DCDC module 200 is adjacent to the third side 70 and the second side 60, the DCDC module 200, the second DC bus capacitor 11, the second EMC module 12 and the DC output end 13 are sequentially arranged on the PCB 300 along the first direction A, and the first control circuit 21, the second control circuit 22 and the auxiliary power supply 20 are arranged between the first EMC module 3 and the second EMC module 12.

[0027] The AC input end 1 is an energy transmission port of alternating current, and the DC output end 13 is an energy transmission port of direct current.

[0028] The first EMC module 3 is an EMC circuit of the AC input end 1. The first EMC module 3 can suppress noise and interference, and provide a low-noise environment for the vehicle-mounted device.

[0029] The first DC bus capacitor 4 has a large capacitance on the PCB 300, and mainly provides filtering and energy support for the PFC module 100.

[0030] The PFC module 100 is used for power factor correction.

[0031] The DCDC module 200 is used for DC-DC conversion, and converts the corrected direct current voltage into a suitable output voltage.

[0032] The second DC bus capacitor 11 is a bus capacitor of the DC output end 13, has a small capacitance, and mainly provides direct current output filtering.

[0033] The second EMC module 12 is adjacent to the second DC bus capacitor 11, and is mainly used to suppress noise and interference on the direct current output side.

[0034] The auxiliary power supply 20 is used to power the entire circuit.

[0035] The first control circuit 21 is close to the PFC module 100, and is used to control the circuit of the PFC module 100.

[0036] The second control circuit 22 mainly includes an external information interaction circuit and a control circuit of the DCDC module 200.

[0037] It should be noted that the first direction A and the second direction B can be any angle other than 0, Figure 1 and Figure 2 only the first direction A and the second direction B are perpendicular as an example.

[0038] Referring to Figure 2 , Figure 2 is a structural schematic diagram of the circuit board 1000 provided by another embodiment of the present application.

[0039] In some embodiments, the PFC module 100 includes a first magnetic device connection port 14, a second magnetic device connection port 15, and a PFC power tube 5. The first magnetic device connection port 14 is adjacent to the third side 70, and the first magnetic device connection port 14, the PFC power tube 5, and the second magnetic device connection port 15 are sequentially arranged on the PCB board 300 along the first direction A.

[0040] In some embodiments, the DCDC module 200 includes a third magnetic device connection port 16, a fourth magnetic device connection port 17, a DCDC primary side power tube 7, a DCDC secondary side power tube 10, and a mutual inductor 8. The third magnetic device connection port 16 is adjacent to the third side 70, and the third magnetic device connection port 16 and the fourth magnetic device connection port 17 are arranged on the PCB board 300 along the second direction B. The third magnetic device connection port 16 and the DCDC primary side power tube 7 are arranged on the PCB board 300 along the first direction A, and the DCDC primary side power tube 7, the mutual inductor 8, and the DCDC secondary side power tube 10 are arranged on the PCB board 300 along the second direction B.

[0041] Specifically, the first magnetic device connection port 14 and the second magnetic device connection port 15, and the third magnetic device connection port 16 and the fourth magnetic device connection port 17 provide plug-in interfaces for the connection of magnetic devices. The magnetic devices only occupy the positions of the plug-in interfaces on the top of the PCB board 300, effectively reducing the impact of the volume of the magnetic devices on the layout of the PCB board, and the lower part of the magnetic device assembly can be arranged with other electronic components. The first magnetic device connection port 14 and the second magnetic device connection port 15 are distributed at both ends of the PFC power tube 5, serving as the electrical connection points of the magnetic devices of the PFC power tube 5. The PFC power tube 5 adopts a surface mount device and is placed in the middle area between the first magnetic device connection port 14 and the second magnetic device connection port 15.

[0042] Specifically, the third magnetic device connection port 16 and the fourth magnetic device connection port 17 are input and output interfaces of the magnetic devices of the DCDC of the vehicle charger on the PCB board 300. The DCDC primary side power tube 7 adopts a surface mount device. A mutual inductor 8 is usually arranged to protect the DCDC circuit and achieve the functions of overcurrent protection in abnormal working conditions by sampling current. The DCDC secondary side power tube 10 adopts a surface mount device.

[0043] In this embodiment, the PFC power tube 5, the DCDC primary power tube 7 and the DCDC secondary power tube 10 are generally arranged on the third side edge of the PCB board, and the positions are relatively concentrated. The power tube device is the main heat generating device in the vehicle charger. The concentrated arrangement can greatly simplify the design of the radiator and better conduct and dissipate heat.

[0044] In some embodiments, the circuit board 1000 further comprises a first resonant capacitor 6. Among them, the first resonant capacitor 6 is arranged between the PFC module 100 and the DCDC module 200.

[0045] In some embodiments, the circuit board 1000 further comprises a second resonant capacitor 9. Among them, the second resonant capacitor 9 is adjacent to the third side edge 70 and the second side edge 60.

[0046] The loss of the first resonant capacitor 6 and the second resonant capacitor 9 is not very high, but the temperature rise is relatively high compared to the temperature resistance level of the device. Certain auxiliary heat dissipation is necessary. The first resonant capacitor 6 and the second resonant capacitor 9 are arranged on the PCB board 300 for the purpose of facilitating electrical connection and placement near the power tube. The radiator of the power tube can be used to dissipate heat for the first resonant capacitor 6 and the second resonant capacitor 9, and concentrated heat dissipation can be achieved.

[0047] In some embodiments, the circuit board 1000 further comprises a first driving power supply 18. Among them, the first driving power supply 18 is adjacent to the PFC module 100.

[0048] Specifically, the corresponding first driving power supply 18 is arranged adjacent to the PFC power tube 5 to provide driving power supply for the PFC power tube 5.

[0049] In some embodiments, the circuit board 1000 further comprises a second driving power supply 19. Among them, the second driving power supply 19 is adjacent to the DCDC module 200.

[0050] The second driving power supply 19 is adjacent to the DCDC module 200 to provide driving power supply for the DCDC primary power tube 7 and the secondary power DCDC secondary power tube 10.

[0051] In some embodiments, the circuit board 1000 further comprises an information interaction port 24.

[0052] Among them, the information interaction port 24 is arranged between the alternating current input end 1 and the direct current output end 13, and the information interaction port 24 is adjacent to the second control circuit 22.

[0053] Specifically, the information interaction port 24 is between the alternating current input end 1 and the direct current output end 13, and maintains sufficient insulation distance with them. The main function of the information interaction port 24 is to communicate with the vehicle end and transmit low-voltage signals.

[0054] In some embodiments, the circuit board 1000 further comprises a control circuit interface 23. Wherein the control circuit interface 23 is adjacent to the second control circuit 22, and the second control circuit 22 and the control circuit interface 23 are arranged along the second direction B.

[0055] The control circuit interface 23 is used to transmit the control signal of the vehicle low-voltage DCDC, and control the vehicle low-voltage DCDC to work normally.

[0056] In some embodiments, the circuit board 1000 further comprises a surge protection and fuse circuit interface 2.

[0057] Wherein, the surge protection and fuse circuit interface 2 is arranged between the AC input end 1 and the first EMC module 3.

[0058] Specifically, the surge protection and fuse circuit is not directly arranged on the PCB board 300, but is directly welded on the PCB board through the surge protection and fuse circuit interface 2, thereby providing protection for the vehicle charger. The surge protection and fuse circuit interface 2 is next to the AC input end 1, thereby providing the most direct protection for the vehicle charger.

[0059] In the embodiments of the present application, the circuit layout of the AC input end, the first EMC module, the first DC bus capacitor, the PFC module, the DCDC module, the second DC bus capacitor, the second EMC module, and the DC output end is reasonable. The AC power is first preprocessed by the first EMC module and the first DC bus capacitor, then enters the PFC module for power factor correction, thereby improving the utilization efficiency of the power supply. Then, the DC-DC conversion is performed by the DCDC module, thereby converting the corrected DC voltage into a suitable output voltage. This compact layout shortens the power supply signal transmission path and reduces the line loss, thereby improving the overall efficiency of the power supply processing. The modules with more heat (such as the PFC module and the DCDC module) are concentrated near the third side edge, which can facilitate centralized heat dissipation. Through the external heat sink, the heat can be effectively removed to reduce the risk of local overheating and improve the heat dissipation efficiency of the circuit board. Moreover, the magnetic device assembly only occupies the position of the plug-in interface on the PCB board, thereby greatly reducing the volume of the PCB board.

[0060] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, rather than limiting them; under the idea of the present application, the technical features in the above examples or different examples can also be combined, and there are many other changes of different aspects of the present application as described above, in order to be simple, they are not provided in details; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of each embodiment of the present application.

Claims

1. A circuit board, characterized by, The circuit board comprises a PCB board, an alternating current input end, a first EMC module, a first direct current bus capacitor, a PFC module, a DCDC module, an auxiliary power supply, a first control circuit, a second control circuit, a second direct current bus capacitor, a second EMC module, and a direct current output end. The PCB board comprises a first side edge and a second side edge opposite to each other and extending in a first direction, and a third side edge and a fourth side edge opposite to each other and extending in a second direction between the first side edge and the second side edge. The first direct current bus capacitor is adjacent to the first side edge and the third side edge, the first direct current bus capacitor, the first EMC module, and the alternating current input end are sequentially arranged on the PCB board in the first direction, the first direct current bus capacitor, the PFC module, and the DCDC module are sequentially arranged on the PCB board in the second direction, the DCDC module is adjacent to the third side edge and the second side edge, the DCDC module, the second direct current bus capacitor, the second EMC module, and the direct current output end are sequentially arranged on the PCB board in the first direction, and the first control circuit, the second control circuit, and the auxiliary power supply are arranged between the first EMC module and the second EMC module.

2. The circuit board of claim 1, wherein The PFC module comprises a first magnetic device connection port, a second magnetic device connection port, and a PFC power tube. The first magnetic device connection port is adjacent to the third side edge, and the first magnetic device connection port, the PFC power tube, and the second magnetic device connection port are sequentially arranged on the PCB board in the first direction.

3. The circuit board of claim 1, wherein, The DCDC module comprises a third magnetic device connection port, a fourth magnetic device connection port, a DCDC primary side power tube, a DCDC secondary side power tube, and a mutual inductor. The third magnetic device connection port is adjacent to the third side edge, the third magnetic device connection port and the fourth magnetic device connection port are arranged on the PCB board in the second direction, the third magnetic device connection port and the DCDC primary side power tube are arranged on the PCB board in the first direction, and the DCDC primary side power tube, the mutual inductor, and the DCDC secondary side power tube are arranged on the PCB board in the second direction.

4. The circuit board of claim 1, wherein The circuit board further comprises a first resonant capacitor. The first resonant capacitor is arranged between the PFC module and the DCDC module.

5. The circuit board of claim 1, wherein The circuit board further comprises a second resonant capacitor. The second resonant capacitor is adjacent to the third side edge and the second side edge.

6. The circuit board of claim 1, wherein The circuit board further comprises a first drive power supply. The first drive power supply is adjacent to the PFC module.

7. The circuit board of claim 1, wherein The circuit board further comprises a second drive power supply. The second drive power supply is adjacent to the DCDC module.

8. The circuit board of claim 1, wherein, The circuit board further comprises an information interaction port. The information interaction port is arranged between the alternating current input end and the direct current output end, and the information interaction port is adjacent to the second control circuit.

9. The circuit board of claim 1, wherein, The circuit board further comprises a control circuit interface. The control circuit interface is adjacent to the second control circuit, and the second control circuit is disposed along the second direction from the control circuit interface.

10. The circuit board according to any one of claims 1 to 9, characterized in that, The circuit board further comprises a surge protection and fuse circuit interface; The surge protection and fuse circuit interface is disposed between the AC input and the first EMC module.

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