Device with multifunctional circuit board

Abstract

The utility model discloses a device with a multifunctional circuit board, the device comprises a first functional circuit board and a second functional circuit board which are independent, and a power supply cable and a signal cable are connected between the first functional circuit board and the second functional circuit board. The second functional circuit board supplies power to the first functional circuit board through the power supply cable, and signal transmission is carried out between the first functional circuit board and the second functional circuit board through the signal cable; at least one of the first functional circuit board and the second functional circuit board is provided with a signal ground plane and a power supply ground plane which are separated from each other. Through the separated signal ground plane and the power supply ground plane, the inter-board ground potential deviation can be concentrated on the power supply ground plane, the potential of the signal ground plane does not fluctuate, and it is ensured that the transmission precision and quality of the signal cable are not affected.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and more particularly to a device with a multifunctional circuit board. Background Technology

[0002] Cost reduction and efficiency improvement are the mainstream development plans of electrical equipment manufacturers. From the perspective of performance and quality, isolation devices such as optocouplers, capacitive couplers, and magnetic couplers are undoubtedly the best choice for signal transmission and protection. However, due to their high cost and the increased onboard space, many low-cost electrical devices still use non-isolation devices in the design process.

[0003] The problem with the above solution is that changes in external load can easily lead to imbalances or deviations in the ground potential between boards, resulting in a decrease in the accuracy of inter-board signal transmission. This is especially true for high-current load fluctuations, which have a more significant impact on ground potential deviations. Even using high-quality cables between boards cannot solve this problem, and sometimes it is necessary to resort to solutions that reduce sampling accuracy to compensate for it. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a device with a multifunctional circuit board to solve the problem of reduced signal transmission accuracy between boards caused by imbalance or deviation of ground potential between boards.

[0005] The technical solution adopted in this application to solve the above-mentioned technical problems is as follows:

[0006] This application provides a device with a multifunctional circuit board. The device includes an independent first functional circuit board and a second functional circuit board. A power supply cable and a signal cable are connected between the first functional circuit board and the second functional circuit board. The second functional circuit board supplies power to the first functional circuit board through the power supply cable. The first functional circuit board and the second functional circuit board transmit signals to each other through the signal cable.

[0007] At least one of the first and second functional circuit boards has a separated signal ground plane and a power supply ground plane.

[0008] In one example, the first functional circuit board includes a main control circuit board for controlling the device; and / or, the second functional circuit board includes a power circuit board on which the power components of the device are integrated.

[0009] In one example, the power circuit board is also provided with a current-mode sampling module, and the current-mode sampling signal of the current-mode sampling module is transmitted to the main control circuit board through the signal cable.

[0010] In one example, the power circuit board is also provided with a voltage sampling module, and the voltage sampling signal of the voltage sampling module is transmitted to the main control circuit board through the signal cable.

[0011] In one example, the first functional circuit board and / or the second functional circuit board are provided with external load terminals for connecting to an external load.

[0012] In one example, no isolation devices are provided on the first functional circuit board and / or the second functional circuit board.

[0013] In one example, one of the first and second functional circuit boards has a separate signal ground plane and a separate power supply ground plane, while the other functional circuit board does not have a separate signal ground plane and a separate power supply ground plane.

[0014] In one example, the second functional circuit board is provided with a power supply circuit to supply power to the first functional circuit board through the power supply cable.

[0015] In one example, the area where the signal ground plane is located is also provided with a signal cable base for connecting to one end of the signal cable.

[0016] In one example, the area where the power supply ground plane is located is also provided with a power supply cable base for connecting to one end of the power supply cable.

[0017] The device with a multi-functional circuit board provided in this application embodiment, by separating the signal ground plane and the power supply ground plane, enables the ground potential deviation between boards to be concentrated on the power supply ground plane, while the potential of the signal ground plane does not fluctuate, ensuring that the transmission accuracy and quality of the signal cable are not affected. Attached Figure Description

[0018] Figure 1 A schematic diagram of a device with a multifunctional circuit board provided in an embodiment of this application;

[0019] Figure 2 A schematic diagram of a device with a main control circuit board and a power circuit board provided for an embodiment of this application;

[0020] Figure 3 A schematic diagram of ground plane segmentation provided for an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the current loop provided in an embodiment of this application;

[0022] Figure 5 A schematic diagram of another device having a main control circuit board and a power circuit board, provided for an embodiment of this application;

[0023] Figure 6 This is another schematic diagram of land plane segmentation provided in an embodiment of this application;

[0024] Figure 7 This is a schematic diagram of another current loop provided for an embodiment of this application.

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer and more understandable, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit the scope of this application.

[0027] like Figure 1 As shown in the figure, this application provides a device with a multi-functional circuit board. The device includes an independent first functional circuit board 10 and a second functional circuit board 20. A signal cable 30 and a power supply cable 40 are connected between the first functional circuit board 10 and the second functional circuit board 20. The second functional circuit board 20 supplies power to the first functional circuit board 10 through the power supply cable 40. The first functional circuit board 10 and the second functional circuit board 20 transmit signals through the signal cable 30, such as transmitting voltage-type sampling signals, current-type sampling signals, etc. At least one of the first functional circuit board 10 and the second functional circuit board 20 has a separated signal ground plane and a power supply ground plane. For example, the first functional circuit board 10 shown in the figure has a separated signal ground plane GND_D and a power supply ground plane GND_S.

[0028] In both the first functional circuit board 10 and the second functional circuit board 20, the isolation between the power supply ground and the signal ground is achieved through the isolation of the circuit board ground plane, which saves the use of isolation devices.

[0029] The aforementioned device, by separating the signal ground plane and the power supply ground plane, enables the ground potential deviation between boards to be concentrated on the power supply ground plane, while the potential of the signal ground plane remains stable, ensuring that the transmission accuracy and quality of the signal cable are not affected.

[0030] In one example, the area where the signal ground plane is located is also provided with a signal cable base 11 for connecting to one end of the signal cable 30. The area where the power supply ground plane is located is also provided with a power supply cable base 12 for connecting to one end of the power supply cable 40.

[0031] In one example, the first functional circuit board 10 and / or the second functional circuit board 20 are provided with external load terminals for connecting to an external load.

[0032] In one example, the second functional circuit board 20 is further provided with a current-type sampling module 21, and the current-type sampling signal of the current-type sampling module 21 is transmitted to the first functional circuit board 10 through the signal cable 30. It should be noted that the current-type sampling signal is not affected by the cable impedance when transmitted to the first functional circuit board 10 via the signal cable 30.

[0033] In one example, the second functional circuit board 20 is also equipped with a voltage-type sampling module 22, and the voltage-type sampling signal of the voltage-type sampling module 22 is transmitted to the first functional circuit board 10 through the signal cable 30. It should be noted that the voltage-type sampling signal may experience a decrease in amplitude due to voltage division caused by cable impedance and ground loop fluctuations of the first functional circuit board 10, which may affect the sampling accuracy.

[0034] In one example, no isolation devices are provided on the first functional circuit board 10 and / or the second functional circuit board 20, which saves space and cost compared to the isolation device design.

[0035] In one example, one of the first functional circuit board 10 and the second functional circuit board 20 has a separated signal ground plane and a power supply ground plane, while the other functional circuit board does not have a separated signal ground plane and a power supply ground plane. As shown in the figure, the first functional circuit board 10 has a separated signal ground plane GND_D and a separated power supply ground plane GND_S, while the second functional circuit board 20 does not have a separated signal ground plane and a power supply ground plane.

[0036] In one example, the second functional circuit board 20 is provided with a power supply circuit 23 to supply power to the first functional circuit board 10 through the power supply cable 40.

[0037] In one example, the first functional circuit board 10 includes a main control circuit board for controlling the device; the second functional circuit board 20 includes a power circuit board that integrates the power components of the device, such as power switching transistors.

[0038] The following combination Figures 2-4 The following explanation addresses the scenario where the main control circuit board has a separate signal ground plane GND_D and a power supply ground plane GND_S, while the power circuit board does not have separate signal ground planes and power supply ground planes:

[0039] like Figures 2-4As shown, the main control circuit board and the power circuit board are connected via inter-board cables. These cables include power supply cables for the main control circuit board and signal cables for signal transmission between them. Both the main control circuit board and the power circuit board require external loads. Without isolation devices, the ground plane of the main control circuit board is isolated, separating the signal ground plane GND_D from the power supply ground plane GND_S. The power circuit board is not differentiated in this way.

[0040] Current loop analysis was performed to optimize the inter-plate ground potential deviation:

[0041] First, when the external load on the power circuit board changes, the load circuit is completed on the power circuit board itself, without passing through the main control circuit board. Therefore, since there is no change in current in the inter-board cables, the signal transmission accuracy between the boards is unaffected.

[0042] Secondly, when the external load on the main control circuit board changes abruptly, the current required for the load change originates from the power supply circuit of the power circuit board. Due to the independence of the power supply ground plane of the main control circuit board, the voltage drop caused by the current change due to the load change is concentrated on the power supply cable between the boards. Ultimately, the ground potential deviation between the boards is concentrated on the power supply ground plane of the main control circuit board, while the signal ground plane of the main control circuit board and the ground plane of the power circuit board have no fluctuation (the potential amplitude is the same), and the signal cable transmission quality is not affected.

[0043] The following combination Figures 5-7 The following explanation addresses the scenario where the main control circuit board does not have separate signal ground planes and power supply ground planes, while the power circuit board has separate signal ground plane GND_D and power supply ground plane GND_S:

[0044] like Figures 5-7 As shown, with Figures 2-4 The difference lies in the way the ground plane is divided, which changes from the main control circuit board to the power circuit board. Specifically, the ground plane of the main control circuit board is not divided, while the power circuit board separates the power supply ground plane and the signal ground plane.

[0045] Similarly, current loop analysis is performed to optimize the inter-plate ground potential deviation:

[0046] For power circuit boards, when the external load changes, the load circuit is completed on the power supply ground plane on the power circuit board, and the signal ground plane is not affected because it is isolated. Therefore, the inter-board ground potential is not affected by the external load of the power circuit board.

[0047] For the main control circuit board, when its external load is switched, the current loop on the main control circuit board is completed from the ground plane of the whole board. Since the main control circuit board is powered by the power circuit board, the current loop on the power circuit board is completed at the power supply ground plane. The voltage drop caused by the current change is generated by the impedance of the power supply cable, while the signal cable is not affected. Therefore, there is no potential fluctuation between the ground plane of the main control circuit board and the signal ground plane of the power circuit board.

[0048] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A device with a multifunctional circuit board, characterized in that, The device includes an independent first functional circuit board and a second functional circuit board. A power supply cable and a signal cable are connected between the first functional circuit board and the second functional circuit board. The second functional circuit board supplies power to the first functional circuit board through the power supply cable, and the first functional circuit board and the second functional circuit board transmit signals through the signal cable. At least one of the first and second functional circuit boards has a separated signal ground plane and a power supply ground plane.

2. The apparatus as claimed in claim 1, characterized in that, The first functional circuit board includes a main control circuit board, which is used to control the device; and / or, the second functional circuit board includes a power circuit board, which integrates the power components of the device.

3. The apparatus as described in claim 2, characterized in that, The power circuit board is also equipped with a current sampling module, and the current sampling signal of the current sampling module is transmitted to the main control circuit board through the signal cable.

4. The apparatus as claimed in claim 2, characterized in that, The power circuit board is also equipped with a voltage sampling module, and the voltage sampling signal of the voltage sampling module is transmitted to the main control circuit board through the signal cable.

5. The apparatus as claimed in claim 1, characterized in that, The first functional circuit board and / or the second functional circuit board are provided with external load terminals, which are used to connect to an external load.

6. The apparatus as claimed in claim 1, characterized in that, No isolation devices are provided on the first functional circuit board and / or the second functional circuit board.

7. The apparatus as claimed in claim 1, characterized in that, One of the first and second functional circuit boards has a separate signal ground plane and a separate power supply ground plane, while the other functional circuit board does not have a separate signal ground plane and a separate power supply ground plane.

8. The apparatus as claimed in claim 1, characterized in that, The second functional circuit board is provided with a power supply circuit to supply power to the first functional circuit board through the power supply cable.

9. The apparatus as claimed in claim 1, characterized in that, The area where the signal ground plane is located is also provided with a signal cable base for connecting to one end of the signal cable.

10. The apparatus as claimed in claim 1, characterized in that, The area where the power supply ground plane is located is also provided with a power supply cable base for connecting to one end of the power supply cable.

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