High-voltage filter circuit, vehicle-mounted high-voltage system, circuit board and vehicle

Abstract

The utility model provides a high-voltage filter circuit, vehicle-mounted high-voltage system, circuit board and vehicle, which are applied to the technical field of automobiles, the high-voltage filter circuit comprises an automobile power supply, a filter and a plurality of devices in the automobile, the first end of the filter is connected with the positive pole of the power supply, the second end of the filter is connected with the input ends of the plurality of devices, and the first end of the filter is connected with the positive pole of the power supply. The third end of the filter is connected with the output ends of the multiple devices, the fourth end of the filter is connected with the negative electrode of the power source, and the filter is used for restraining electromagnetic interference generated in the process that the power source supplies power to the multiple devices, so that the influence of the electromagnetic interference on other devices in the automobile is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage systems, and in particular to a high-voltage filter circuit, a vehicle-mounted high-voltage system, a circuit board and a vehicle. Background Art

[0002] Most of the devices in the car (especially high-voltage devices) have inverter, rectifier and other circuits. The high-frequency switching action of the equipment will bring a large voltage change rate and current change rate to the circuit. The large voltage change rate and the large current change rate will generate strong electromagnetic interference (EMI) in the circuit. When EMI propagates in the circuit, it will affect the normal operation of other devices in the car. Utility Model Content

[0003] The utility model provides a high-voltage filtering circuit, a vehicle-mounted high-voltage system, a circuit board and a vehicle. By arranging a filter between a power source of a vehicle and a plurality of devices in the vehicle, the filter is used to suppress electromagnetic interference generated in the process of the vehicle power source supplying power to the plurality of devices in the vehicle, thereby reducing the influence of the electromagnetic interference on other devices in the vehicle.

[0004] In a first aspect, the utility model provides a high-voltage filter circuit, which is applied to an automobile, and the high-voltage filter circuit includes: a power supply of the automobile, a first filter and multiple devices in the automobile; the first end of the first filter is connected to the positive pole of the power supply, the second end of the first filter is connected to the input ends of the multiple devices, the third end of the first filter is connected to the output ends of the multiple devices, and the fourth end of the first filter is connected to the negative pole of the power supply; the first filter is used to suppress the electromagnetic interference generated by the power supply in the process of supplying power to the multiple devices.

[0005] The above scheme sets a filter between the power supply of the car and multiple devices in the car, and uses the filter to suppress EMI in the current or signal passing through when the power supply supplies power to multiple devices, thereby reducing the impact of electromagnetic interference on other devices in the car.

[0006] In addition, in the above-mentioned high-voltage filter circuit, only one filter is placed between the power supply of the car and multiple devices in the car. The filter can be used to suppress the EMI generated in the process of the power supply supplying multiple devices. The filter is decoupled from the multiple devices. Compared with configuring a separate filter for each device, it can avoid occupying equipment space, reduce the overall volume and weight of the internal equipment of the car, and thus reduce costs. Furthermore, since the filter is decoupled from the multiple devices, when it is necessary to improve the suppression effect of the EMI generated in the process of the power supply supplying multiple devices, only the filter needs to be rectified or the device replaced. Compared with updating the filter in each device one by one, the repair efficiency of the vehicle-mounted high-voltage system can also be improved.

[0007] In a possible implementation of the first aspect, the high-voltage filtering circuit also includes: a second filter; the second end of the first filter is connected to the multiple devices through the second filter, including: the second end of the first filter is connected to the first end of the second filter, the second end of the second filter is connected to the input ends of the multiple devices, and the third end of the second filter is connected to the output ends of the multiple devices; the third end of the first filter is connected to the fourth end of the second filter; the second filter is also used to suppress electromagnetic interference generated by the power supply in the process of supplying power to the multiple devices.

[0008] The above scheme, by setting a multi-stage filter between the power supply of the car and multiple devices in the car (such as setting a two-stage filter: a first filter and a second filter as mentioned above), can suppress the EMI generated by the power supply in the process of supplying power to multiple devices at a deeper level, and further reduce the impact of EMI on other devices in the car.

[0009] In a possible implementation of the first aspect, the high-voltage filtering circuit also includes: a second filter; the second end of the first filter is connected to the input end of a part of the multiple devices, and the third end of the first filter is connected to the output end of a part of the multiple devices; the second end of the first filter is connected to another part of the multiple devices through the second filter, including: the second end of the first filter is connected to the first end of the second filter, the second end of the second filter is connected to the input end of another part of the multiple devices, and the third end of the second filter is connected to the output end of another part of the multiple devices; the third end of the first filter is connected to the fourth end of the second filter; the second filter is used to suppress the electromagnetic interference generated by the power supply in the process of supplying power to another part of the multiple devices; the second filter is also used to suppress the electromagnetic interference generated during the operation of the multiple devices.

[0010] The above scheme sets the first filter and the second filter between the power supply of the car and multiple devices in the car, and connects a part of the devices to the power supply only through the first filter, and connects the other part of the devices to the power supply through the first filter and the second filter. Since different devices have different EMI filtering requirements, and when the above high-voltage filter circuit is working, there will be a little EMI between the devices. Through the above scheme, a part of the devices with low EMI filtering requirements can be connected to the power supply only through the first filter, and the other part of the devices with high EMI filtering requirements can be connected to the power supply through the first filter and the second filter, so as to provide different degrees of EMI filtering for different devices, and there is a second filter between the device with low EMI filtering requirements and the device with high EMI filtering requirements. The second filter can filter the EMI interference between the device with low EMI filtering requirements and the device with high EMI filtering requirements. For example, when the EMI generated by the device with low EMI filtering requirements is transmitted to the input end of the device with high EMI filtering requirements, since there is a second filter before the input end of the device with high EMI filtering requirements, the EMI will pass through the second filter and be suppressed.

[0011] According to the above scheme, it can be inferred that the high-voltage filtering circuit provided by the utility model can have more filters. For example, the above scheme can also include a third filter, a fourth filter, etc., and multiple devices can also use a corresponding number of filters for filtering according to the filtering requirements for EMI.

[0012] In a possible implementation manner of the first aspect, the first filter includes: a first common-mode inductor, a first differential-mode capacitor and a first common-mode capacitor; the first end of the first common-mode inductor is the first end of the first filter, the second end of the first common-mode inductor is the second end of the first filter, the third end of the first common-mode inductor is the third end of the first filter, and the fourth end of the first common-mode inductor is the fourth end of the first filter; the second end of the first common-mode inductor is connected to the first end of the first differential-mode capacitor and the first end of the first common-mode capacitor, and the third end of the first common-mode inductor is connected to the second end of the first differential-mode capacitor and the second end of the first common-mode capacitor; the first common-mode inductor is used to suppress the common-mode component of the electromagnetic interference generated in the process of the power supply supplying power to the multiple devices; the first differential-mode capacitor is used to suppress the differential-mode component of the electromagnetic interference generated in the process of the power supply supplying power to the multiple devices; the first common-mode capacitor is used to suppress the common-mode component of the electromagnetic interference generated in the process of the power supply supplying power to the multiple devices.

[0013] In a possible implementation manner of the first aspect, the second filter includes: a second common-mode inductor, a second differential-mode capacitor, and a second common-mode capacitor; a first end of the second common-mode inductor is a first end of the second filter, a second end of the second common-mode inductor is a second end of the second filter, a third end of the second common-mode inductor is a third end of the second filter, and a fourth end of the second common-mode inductor is a fourth end of the second filter; a second end of the second common-mode inductor is connected to a first end of the second differential-mode capacitor and a first end of the second common-mode capacitor, and a third end of the second common-mode inductor is connected to a second end of the second differential-mode capacitor and a second end of the second common-mode capacitor; the second common-mode inductor is used to suppress common-mode components in the electromagnetic interference; the second differential-mode capacitor is used to suppress differential-mode components in the electromagnetic interference; and the second common-mode capacitor is used to suppress common-mode components in the electromagnetic interference.

[0014] In a second aspect, the utility model provides a vehicle-mounted high-voltage system, wherein the filter comprises a high-voltage filter circuit as described in the first aspect and any possible implementation of the first aspect.

[0015] In a third aspect, the utility model provides a circuit board, wherein the circuit board comprises the high-voltage filter circuit as described in the first aspect and any possible implementation manner of the first aspect.

[0016] In a fourth aspect, the utility model provides a vehicle, comprising the vehicle-mounted high-voltage system as described in the second aspect or the circuit board as described in the third aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a structural schematic diagram of a high-voltage filter circuit provided by the utility model;

[0019] Figure 2 It is a structural schematic diagram of another high-voltage filter circuit provided by the utility model;

[0020] Figure 3 It is a structural schematic diagram of another high-voltage filter circuit provided by the utility model;

[0021] Figure 4A It is a structural schematic diagram of another high-voltage filter circuit provided by the utility model;

[0022] Figure 4B It is a structural schematic diagram of another high-voltage filter circuit provided by the utility model;

[0023] Figure 5 It is a structural schematic diagram of a first filter provided by the utility model;

[0024] Figure 6 It is a structural schematic diagram of a second filter provided by the utility model. DETAILED DESCRIPTION

[0025] The technical solutions involved in the utility model are described clearly and completely below in conjunction with the accompanying drawings. The embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the term "comprising" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, products or devices.

[0027] It should be noted that the terms of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" of the present invention are also intended to include plural forms, unless the context clearly indicates other meanings.

[0028] There are a large number of devices inside the car, and most of them (especially high-voltage devices) have inverter and rectifier circuits. The high-frequency switching action of the device will bring a large voltage change rate and current change rate to the circuit where it is located. The large voltage change rate and the large current change rate will generate strong electromagnetic interference (EMI) in the circuit.

[0029] In view of the problem that the high-frequency switching action of the above-mentioned equipment in the car will cause strong EMI in the circuit, the utility model provides several high-voltage filter circuits. The following is a detailed introduction of the several high-voltage filter circuits provided by the utility model in conjunction with the accompanying drawings. Figure 1 , Figure 1 This is a schematic diagram of the structure of a high-voltage filter circuit provided by the utility model. Figure 1As shown, the high-voltage filter circuit includes a power supply of a car, a first filter and a plurality of devices in the car. Figure 1 And the following Figure 2 , Figure 3 , Figure 4A , Figure 4B In the embodiment, for the convenience of description, power supply is used to represent the power supply of the car, and device 1 and device 2 are used to represent multiple devices in the car.

[0030] like Figure 1 As shown, in the high-voltage filter circuit, the positive pole of the power supply is connected to the first end of the first filter, the second end of the first filter is connected to the input end of device 1 and the input end of device 2, the third end of the first filter is connected to the output end of device 1 and the output end of device 2, and the fourth end of the first filter is connected to the negative pole of the power supply.

[0031] The power supply is the energy storage device of the car, which is responsible for storing electrical energy and providing it to the motor drive of the car to drive the car, as well as powering multiple devices. In the scenario involved in the utility model, although the power supply itself does not actively generate EMI, in the process of powering multiple devices, due to the high-frequency opening and closing of the switches of multiple devices, a large current change rate and voltage change rate appear in the circuit, which in turn causes EMI in the circuit. In the car, the power supply can be an on-board battery.

[0032] Multiple devices are power-consuming devices used to improve the performance, safety, comfort and convenience of the car. In the present invention, the multiple devices may include a power system, a safety system, an infotainment system, a communication system, etc., wherein the power system includes an engine, a transmission, etc., the safety system includes a blind spot monitoring device, a collision warning device, etc., the entertainment system includes audio equipment, a multimedia screen, etc., and the communication system includes a car Wi-Fi hotspot, a car phone, etc. It can be seen from the above multiple devices that these devices are not constantly turned on or off during the driving of the car. For example, the audio equipment may be turned on or off multiple times during the driving of the car.

[0033] The first filter is used to suppress the EMI generated in the process of the power supply supplying power to multiple devices. It can be understood that the process of the power supply supplying power to multiple devices is the working process of multiple devices. Therefore, the first filter is used to suppress the EMI generated in the process of the power supply supplying power to multiple devices, which can also be understood as being used to suppress the EMI generated in the working process of multiple devices. For the specific structure of the first filter and the principle of suppressing the EMI generated in the process of the power supply supplying power to multiple devices, please refer to Figure 5 and related descriptions.

[0034] It can be seen that Figure 1The high-voltage filter circuit shown sets a first filter between the power supply of the car and multiple devices in the car, and uses the filter to suppress EMI in the current or signal passing through when the power supply supplies power to multiple devices, thereby reducing the impact of electromagnetic interference on other devices in the car.

[0035] In addition, in the above-mentioned high-voltage filter circuit, only one filter is placed between the power supply and multiple devices, and the filter can be used to suppress the EMI generated in the process of the power supply supplying multiple devices. The filter is decoupled from the multiple devices. Compared with configuring a separate filter for each device, it can avoid occupying equipment space, reduce the overall volume and weight of the internal equipment of the car, and reduce costs. Furthermore, since the filter is decoupled from the multiple devices, when it is necessary to improve the suppression effect of the EMI generated in the process of the power supply supplying multiple devices, it is only necessary to rectify the filter or replace the device. Compared with updating the filter in each device one by one, it can also improve the repair efficiency of the vehicle-mounted high-voltage system.

[0036] See next Figure 2 , Figure 2 It is a structural schematic diagram of another high-voltage filter circuit provided by the utility model. Figure 2 As shown, the high voltage filtering circuit includes a power supply, a first filter, a second filter, a device 1 and a device 2.

[0037] Combination Figure 1 It can be seen from the high voltage filter circuit shown that Figure 2 The high voltage filter circuit shown is Figure 1 The high voltage filter circuits shown differ only in that: Figure 1 The first filter is directly connected to device 1 and device 2. Figure 2 The first filter is connected to device 1 and device 2 through the second filter. Figure 2 The high voltage filter circuit shown is Figure 1 For the same high voltage filter circuit shown in Figure 1 The relevant description is not elaborated here.

[0038] The following only Figure 2 The high voltage filter circuit shown is Figure 1 The differences between the high-voltage filter circuits shown are described in detail.

[0039] like Figure 2 As shown, the second end of the first filter is connected to the first end of the second filter, the third end of the first filter is connected to the fourth end of the second filter, and the fourth end of the first filter is connected to the negative pole of the power supply; the second end of the second filter is connected to the input end of device 1 and the input end of device 2, and the third end of the second filter is connected to the output end of device 1 and the output end of device 2.

[0040] exist Figure 2 In the high-voltage filter circuit shown, the second filter is also used to suppress the electromagnetic interference generated when the power supply is used to supply power to multiple devices. For the specific structure of the second filter and the principle of suppressing the EMI generated when the power supply is used to supply power to multiple devices, please refer to Figure 6 and related descriptions.

[0041] It can be seen that Figure 2 The high-voltage filter circuit shown in the figure can suppress the EMI generated by the power supply in the process of supplying power to multiple devices at a deeper level by setting two-stage filters between the power supply of the car and multiple devices in the car: the first filter and the second filter, and connecting the first filter and the second filter in series, thereby further reducing the impact of EMI on other devices in the car. In a possible embodiment, Figure 2 The number of filters in the high-voltage filter circuit shown can be greater. For example, a third filter, a fourth filter, and the like are connected in series between the second filter and device 1 and device 2. It can be understood that the greater the number of filters in the circuit, the better the effect of suppressing EMI generated by the power supply in the process of supplying power to multiple devices, and the more effectively the impact of EMI on other devices in the car can be reduced.

[0042] See next Figure 3 , Figure 3 It is a structural schematic diagram of another high-voltage filter circuit provided by the utility model. Figure 3 As shown, the high voltage filtering circuit includes a power supply, a first filter, a second filter, a device 1 and a device 2.

[0043] Combination Figure 1 It can be seen from the high voltage filter circuit shown that Figure 3 The high voltage filter circuit shown is Figure 1 The high voltage filter circuits shown differ only in that: Figure 1 The first filter is directly connected to device 1 and device 2, and device 1 is directly connected to device 2. Figure 3 The first filter is connected to device 1 through the second filter, and device 1 is also connected to device 2 through the second filter. Figure 3 The high voltage filter circuit shown is Figure 1 For the same high voltage filter circuit shown in Figure 1 The relevant description is not elaborated here.

[0044] The following only Figure 3 The high voltage filter circuit shown is Figure 1 The differences between the high-voltage filter circuits shown are described in detail.

[0045] like Figure 3As shown, the second end of the first filter is connected to the first end of the second filter and the input end of device 2, the third end of the first filter is connected to the fourth end of the second filter and the output end of device 2, the second end of the second filter is connected to the input end of device 1, and the third end of the second filter is connected to the output end of device 1.

[0046] The second filter is used to suppress electromagnetic interference generated when the power supply supplies power to another part of the multiple devices.

[0047] The second filter is also used to suppress electromagnetic interference generated during the operation of multiple devices.

[0048] It can be seen that Figure 3 The high-voltage filter circuit shown is provided with a first filter and a second filter between the power supply of the automobile and a plurality of devices of the automobile, and a part of the devices are connected to the power supply only through the first filter, and the other part of the devices are connected to the power supply through the first filter and the second filter. Different devices have different EMI filtering requirements, and when the above-mentioned high-voltage filter circuit is working, there will be a little EMI between the devices. Through the above-mentioned scheme, a part of the devices with low EMI filtering requirements can be connected to the power supply only through the first filter, and the other part of the devices with high EMI filtering requirements can be connected to the power supply through the first filter and the second filter, so as to provide different EMI filtering for different devices, and there is also a second filter between the devices with low EMI filtering requirements and the devices with high EMI filtering requirements, and the second filter can filter the EMI interference between the devices with low EMI filtering requirements and the devices with high EMI filtering requirements. For example, when the EMI generated by the device with low EMI filtering requirements is transmitted to the input end of the device with high EMI filtering requirements, since there is still a second filter before the input end of the device with high EMI filtering requirements, the EMI will pass through the second filter and be suppressed.

[0049] according to Figure 3 It can also be deduced that when the number of filters in the high-voltage filtering circuit provided by the utility model is greater, multiple devices can also be connected to the power supply and the filter in more ways. For example, the high-voltage filtering circuit also includes a third filter. In this case, the multiple devices can be divided into three parts according to actual EMI filtering requirements: a part with low EMI filtering requirements, a part with medium EMI filtering requirements, and a part with high EMI filtering requirements. The part with low EMI filtering requirements is connected to the power supply only through the first filter, the part with medium EMI filtering requirements is connected to the power supply only through the first filter and the second filter, and the part with high EMI filtering requirements is connected to the power supply through the first filter, the second filter and the third filter. For specific connection conditions, please refer to Figure 4A ,exist Figure 4A In the figure, device 3 represents a device with low EMI filtering requirements, device 2 represents a device with medium EMI filtering requirements, and device 1 represents a device with high EMI filtering requirements.

[0050] The utility model also provides another high voltage filter circuit, such as Figure 4B As shown, the high voltage filter circuit includes a power supply, a first filter, a second filter 1 , a second filter 2 , a device 1 and a device 2 .

[0051] The second filter 1 can correspond to Figure 2 The second filter shown, the second filter 2 can correspond to Figure 3 The second filter is shown.

[0052] Combination Figure 2 The high voltage filter circuit shown and Figure 3 It can be seen from the high voltage filter circuit shown that Figure 4B The high voltage filter circuit shown is Figure 2 The high voltage filter circuit shown is Figure 3 The combination of high voltage filter circuit is shown. Therefore, Figure 4B The high voltage filter circuit shown also has Figure 2 The beneficial effects of the high voltage filter circuit shown and Figure 3 The beneficial effects of the high voltage filter circuit shown.

[0053] It should be understood that Figure 4B This is just an example. In the specific implementation, Figure 4B The high-voltage filter circuit shown may include more filters, and multiple devices may be connected to the power supply and the filter in more ways, which is not specifically limited in this application.

[0054] The utility model further provides a first filter and a second filter. The first filter and the second filter provided by the utility model are respectively introduced in detail below in conjunction with the accompanying drawings.

[0055] See also Figure 5 , Figure 5 : is a schematic diagram of the structure of a first filter provided by the utility model, such as Figure 5 As shown, the first filter 500 includes a first common-mode inductor 501, a first differential-mode capacitor 502, and a first common-mode capacitor 503, wherein the first common-mode inductor 501 includes a first inductor L1 and a second inductor L2, the first differential-mode capacitor 502 includes a first capacitor C1, and the first common-mode capacitor 503 includes a second capacitor C2 and a third capacitor C3.

[0056] In the above-mentioned first filter 500, the first end of the first common-mode inductor 501 is connected to the first end of the first filter 500, the second end of the first common-mode inductor 501 is connected to the first end of the first differential-mode capacitor 502 and the first end of the first common-mode capacitor 503, the third end of the first common-mode inductor 501 is connected to the second end of the first differential-mode capacitor 502 and the second end of the first common-mode capacitor 503, and the fourth end of the first common-mode inductor 501 is connected to the fourth end of the first filter 500; the second end of the first common-mode inductor 501 is connected to the second end of the first filter 500, and the third end of the first common-mode inductor 501 is connected to the third end of the first filter 500.

[0057] Specifically, in the above-mentioned first filter 500, the first end of the first inductor L1 is connected to the first end of the first filter 500, and the second end of the first inductor L1 is connected to the first end of the first capacitor C1; the first end of the second inductor L2 is connected to the fourth end of the first filter 500, and the second end of the second inductor L2 is connected to the second end of the first capacitor C1; the first end of the first capacitor C1 is connected to the first end of the second capacitor C2 and the second end of the first filter 500, and the second end of the first capacitor C1 is connected to the second end of the third capacitor C3 and the third end of the first filter 500; the second end of the second capacitor C2 is connected to the first end of the third capacitor C3 and grounded.

[0058] The first common mode inductor 501 is used to suppress the common mode component of EMI generated when the power supply supplies power to multiple devices.

[0059] The first differential mode capacitor 502 is used to suppress the differential mode component of EMI generated when the power supply supplies power to multiple devices.

[0060] The first common mode capacitor 503 is used to suppress the common mode component of EMI generated when the power supply supplies power to multiple devices.

[0061] The following is a detailed introduction Figure 5 The principle of the first filter shown in the figure for suppressing the electromagnetic interference generated in the process of the power supply supplying power to multiple devices is as follows: when there is current input to the first input end of the first filter 500 (i.e., the first end of the first filter 500), the current first comes to the first end of the first common-mode inductor 501 (i.e., the first end of the first inductor L1), and when the current passes through the first inductor L1, the common-mode component of EMI in the current will be suppressed, and then the current comes to the first end of the first differential-mode capacitor 502 (i.e., the first end of the first capacitor C1), and when the current passes through the first capacitor C1, the differential-mode component of EMI in the current will be suppressed, and then the current comes to the first end of the first common-mode capacitor 503 (i.e., the first end of the second capacitor C2), and when the current passes through the second capacitor C2, the common-mode component of EMI in the current will be suppressed, and finally the current is output to the outside through the first output end of the first filter 500 (i.e., the second end of the first filter 500).

[0062] When current is input to the second input terminal of the first filter 500 (i.e., the third terminal of the first filter 500), the current first reaches the second terminal of the first common-mode capacitor 503 (i.e., the second terminal of the third capacitor C3). When the current passes through the third capacitor C3, the common-mode component of EMI in the current will be suppressed. Then the current reaches the second terminal of the first differential-mode capacitor 502 (i.e., the second terminal of the first capacitor C1). When the current passes through the first capacitor C1, the differential-mode component of EMI in the current will be suppressed. Then the current reaches the third terminal of the first common-mode inductor 501 (i.e., the second terminal of the second inductor L2). When the current passes through the second inductor L2, the common-mode component of EMI in the current will be suppressed. Finally, the current is output to the outside through the second output terminal of the first filter 500 (i.e., the fourth terminal of the first filter 500).

[0063] Here it is explained, Figure 5 The structure of the first filter 500 is only an example provided by the utility model. In actual situations, the structure of the first filter 500 can also use more or fewer devices. For example, the first filter 500 can also include multiple first common-mode inductors 501, first differential-mode capacitors 502, and first common-mode capacitors 503, and the order of filtering the first common-mode inductors 501, the first differential-mode capacitors 502, and the first common-mode capacitors 503 in the first filter 500 can also be changed. The structures of the first common-mode inductors 501, the first differential-mode capacitors 502, and the first common-mode capacitors 503 can also be adjusted according to actual situations. For example, the first common-mode inductors 501 can also include a fifth inductor L5 and a sixth inductor L6.

[0064] See also Figure 6 , Figure 6 : is a schematic diagram of the structure of a second filter provided by the utility model, such as Figure 6 As shown, the second filter 600 includes a second common-mode inductor 601, a second differential-mode capacitor 602, and a second common-mode capacitor 603, wherein the second common-mode inductor 601 includes a third inductor L3 and a fourth inductor L4, the second differential-mode capacitor 602 includes a fourth capacitor C4, and the second common-mode capacitor 603 includes a fifth capacitor C5 and a sixth capacitor C6.

[0065] In the above-mentioned second filter 600, the first end of the second common-mode inductor 601 is connected to the first end of the second filter 600, the second end of the second common-mode inductor 601 is connected to the first end of the second differential-mode capacitor 602 and the first end of the second common-mode capacitor 603, the third end of the second common-mode inductor 601 is connected to the second end of the second differential-mode capacitor 602 and the second end of the second common-mode capacitor 603, and the fourth end of the second common-mode inductor 601 is connected to the fourth end of the second filter 600; the second end of the second common-mode inductor 601 is connected to the second end of the second filter 600, and the third end of the second common-mode inductor 601 is connected to the third end of the second filter 600.

[0066] Specifically, in the above-mentioned second filter 600, the first end of the third inductor L3 is connected to the first end of the second filter 600, and the second end of the third inductor L3 is connected to the first end of the fourth capacitor C4; the first end of the fourth inductor L4 is connected to the fourth end of the second filter 600, and the second end of the fourth inductor L4 is connected to the second end of the fourth capacitor C4; the first end of the fourth capacitor C4 is connected to the first end of the fifth capacitor C5 and the second end of the second filter 600, and the second end of the fourth capacitor C4 is connected to the second end of the sixth capacitor C6 and the third end of the second filter 600; the second end of the fifth capacitor C5 is connected to the first end of the sixth capacitor C6 and grounded.

[0067] The second common mode inductor 601 is used to suppress the common mode component in EMI.

[0068] The second differential mode capacitor 602 is used to suppress the differential mode component in EMI.

[0069] The second common mode capacitor 603 is used to suppress the common mode component in EMI.

[0070] The following is a detailed introduction Figure 6 The principle of the first filter shown in the figure suppressing the electromagnetic interference generated in the process of the power supply supplying power to multiple devices is as follows: when the first input end of the second filter 600 (i.e., the first end of the second filter 600) has current input, the current first comes to the first end of the second common-mode inductor 601 (i.e., the first end of the third inductor L3), when the current passes through the third inductor L3, the common-mode component of EMI in the current will be suppressed, then the current comes to the first end of the second differential-mode capacitor 602 (i.e., the first end of the fourth capacitor C4), when the current passes through the fourth capacitor C4, the differential-mode component of EMI in the current will be suppressed, then the current comes to the first end of the second common-mode capacitor 603 (i.e., the first end of the fifth capacitor C5), when the current passes through the fifth capacitor C5, the common-mode component of EMI in the current will be suppressed, and finally the current is output through the first output end of the second filter 600 (i.e., the second end of the second filter 600).

[0071] When current is input to the second input terminal of the second filter 600 (i.e., the third terminal of the second filter 600), the current first reaches the second terminal of the second common-mode capacitor 603 (i.e., the second terminal of the sixth capacitor C6). When the current passes through the sixth capacitor C6, the common-mode component of EMI in the current will be suppressed. Then the current reaches the second terminal of the second differential-mode capacitor 602 (i.e., the second terminal of the fourth capacitor C4). When the current passes through the fourth capacitor C4, the differential-mode component of EMI in the current will be suppressed. Then the current reaches the third terminal of the second common-mode inductor 601 (i.e., the second terminal of the fourth inductor L4). When the current passes through the fourth inductor L4, the common-mode component of EMI in the current will be suppressed. Finally, the current is output to the outside through the second output terminal of the second filter 600 (i.e., the fourth terminal of the second filter 600).

[0072] Here it is explained, Figure 6 The structure of the second filter 600 is only an example provided by the utility model. In actual situations, the structure of the second filter 600 can also use more or fewer devices. For example, the second filter 600 can also include a plurality of second common-mode inductors 601, second differential-mode capacitors 602, and second common-mode capacitors 603, and the order of filtering of the second common-mode inductors 601, the second differential-mode capacitors 602, and the second common-mode capacitors 603 in the second filter 600 can also be changed. The structures of the second common-mode inductors 601, the second differential-mode capacitors 602, and the second common-mode capacitors 603 can also be adjusted according to actual situations. For example, the second common-mode inductors 601 can also include a seventh inductor L7 and an eighth inductor L8.

[0073] The utility model also provides a vehicle-mounted high-voltage system, which includes the above-mentioned Figures 1 to 6 The first filter and / or the second filter shown in .

[0074] The utility model also provides a circuit board, the circuit board includes the above Figures 1 to 6 The first filter and / or the second filter shown in .

[0075] The utility model also provides a vehicle, which comprises the above Figures 1 to 4B The high voltage filter circuit shown in any one or more figures may also include the above Figure 5 The first filter shown and / or Figure 6 The second filter is shown.

[0076] In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For the part that is not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0077] Those of ordinary skill in the art will appreciate that the modules and circuits of the various examples described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different circuit structures to implement the described functions for each specific application scenario, but such implementation should not be considered to be beyond the scope of the present utility model.

[0078] In the several embodiments provided by the present utility model, it should be understood that the disclosed circuits and devices can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0079] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0080] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0081] The above is a detailed introduction to the disclosed embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A high voltage filter circuit, characterized in that: Applied to an automobile, the high-voltage filter circuit comprises: a power source of the automobile, a first filter and a plurality of devices in the automobile; The first end of the first filter is connected to the positive electrode of the power supply, the second end of the first filter is connected to the input ends of the multiple devices, the third end of the first filter is connected to the output ends of the multiple devices, and the fourth end of the first filter is connected to the negative electrode of the power supply; The first filter is used to suppress electromagnetic interference generated when the power supply supplies power to the multiple devices.

2. The high voltage filter circuit according to claim 1, characterized in that: The high voltage filter circuit further includes: a second filter; The second end of the first filter is connected to the multiple devices through the second filter, including: the second end of the first filter is connected to the first end of the second filter, the second end of the second filter is connected to the input ends of the multiple devices, and the third end of the second filter is connected to the output ends of the multiple devices; The third end of the first filter is connected to the fourth end of the second filter; The second filter is also used to suppress electromagnetic interference generated when the power supply supplies power to the multiple devices.

3. The high voltage filter circuit according to claim 1, characterized in that: The high voltage filter circuit further includes: a second filter; The second end of the first filter is connected to the input end of a part of the multiple devices, and the third end of the first filter is connected to the output end of a part of the multiple devices; The second end of the first filter is connected to another part of the multiple devices through the second filter, including: the second end of the first filter is connected to the first end of the second filter, the second end of the second filter is connected to the input end of another part of the multiple devices, and the third end of the second filter is connected to the output end of another part of the multiple devices; The third end of the first filter is connected to the fourth end of the second filter; The second filter is used to suppress electromagnetic interference generated when the power supply is supplying power to another part of the multiple devices; The second filter is also used to suppress electromagnetic interference generated during the operation of the multiple devices.

4. The high voltage filter circuit according to any one of claims 1 to 3, characterized in that: The first filter comprises: a first common mode inductor, a first differential mode capacitor and a first common mode capacitor; The first end of the first common-mode inductor is the first end of the first filter, the second end of the first common-mode inductor is the second end of the first filter, the third end of the first common-mode inductor is the third end of the first filter, and the fourth end of the first common-mode inductor is the fourth end of the first filter; The second end of the first common-mode inductor is connected to the first end of the first differential-mode capacitor and the first end of the first common-mode capacitor, and the third end of the first common-mode inductor is connected to the second end of the first differential-mode capacitor and the second end of the first common-mode capacitor; The first common-mode inductor is used to suppress the common-mode component of electromagnetic interference generated in the process of the power supply supplying power to the multiple devices; The first differential mode capacitor is used to suppress the differential mode component of the electromagnetic interference generated in the process of the power supply supplying power to the multiple devices; The first common-mode capacitor is used to suppress the common-mode component of electromagnetic interference generated when the power supply supplies power to the multiple devices.

5. The high voltage filter circuit according to claim 2 or 3, characterized in that: The second filter comprises: a second common mode inductor, a second differential mode capacitor and a second common mode capacitor; The first end of the second common-mode inductor is the first end of the second filter, the second end of the second common-mode inductor is the second end of the second filter, the third end of the second common-mode inductor is the third end of the second filter, and the fourth end of the second common-mode inductor is the fourth end of the second filter; The second end of the second common-mode inductor is connected to the first end of the second differential-mode capacitor and the first end of the second common-mode capacitor, and the third end of the second common-mode inductor is connected to the second end of the second differential-mode capacitor and the second end of the second common-mode capacitor; The second common mode inductor is used to suppress the common mode component in the electromagnetic interference; The second differential mode capacitor is used to suppress the differential mode component in the electromagnetic interference; The second common-mode capacitor is used to suppress the common-mode component in the electromagnetic interference.

6. A vehicle-mounted high voltage system, characterized in that: The vehicle-mounted high-voltage system includes the high-voltage filter circuit as described in any one of claims 1-5.

7. A circuit board, characterized in that: The circuit board comprises the high-voltage filter circuit as described in any one of claims 1-5.

8. A vehicle, characterized in that: It comprises the vehicle-mounted high-voltage system as claimed in claim 6 or the circuit board as claimed in claim 7.

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