An output electromagnetic compatibility circuit

Abstract

An output electromagnetic compatibility circuit, comprising a first-stage filter capacitor module, a first-stage filter inductor module, a second-stage filter capacitor module, a second-stage filter inductor module and a third-stage filter capacitor module; the first-stage filter capacitor module is connected between a voltage input end and a power ground; the third-stage filter capacitor module is connected between a battery positive electrode and a battery negative electrode; the first-stage filter inductor module, the second-stage filter capacitor module and the second-stage filter inductor module are sequentially connected between the first-stage filter capacitor module and the third-stage filter capacitor module. The utility model discloses through setting multistage filter capacitor module and filter capacitor inductor module, realizes effective multistage filter, can realize better electromagnetic compatibility therefore.

Description

Technical Field

[0001] This utility model relates to a power supply module, and more specifically, to an output electromagnetic compatibility circuit. Background Technology

[0002] As a core component of electric vehicle energy replenishment, the electromagnetic compatibility (EMC) design of charging piles directly impacts the performance level of charging modules, system stability, and user experience. Currently, most charging pile power modules on the market employ filtering circuits to ensure that their EMC performance meets certain EMC specifications. However, with the continuous increase in electric vehicle battery capacity and users' urgent need for fast charging, the power levels of charging modules are constantly expanding, posing higher challenges and more stringent requirements for the overall EMC performance design. Currently, the output EMC circuits of charging modules typically exhibit poor EMC performance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an output electromagnetic compatibility circuit with good electromagnetic compatibility performance, in view of the above-mentioned defects of the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct an output electromagnetic compatibility circuit, including a first-stage filter capacitor module, a first-stage filter inductor module, a second-stage filter capacitor module, a second-stage filter inductor module, and a third-stage filter capacitor module; The first-stage filter capacitor module is connected between the voltage input terminal and the power ground. The third-stage filter capacitor module is connected between the positive and negative terminals of the battery. The first-stage filter inductor module, the second-stage filter capacitor module, and the second-stage filter inductor module are connected sequentially between the first-stage filter capacitor module and the third-stage filter capacitor module.

[0005] In the output electromagnetic compatibility circuit described in this utility model, the first-stage filter capacitor module includes a first Y capacitor, a second Y capacitor, a first X capacitor, and a second X capacitor; The first Y capacitor is connected between the voltage input terminal and the first ground point, and the second Y capacitor is connected between the power ground and the second ground point; The first X capacitor and the second X capacitor are connected in parallel between the voltage input terminal and the power ground.

[0006] In the output electromagnetic compatibility circuit described in this utility model, the first-stage filter inductor module includes a first common-mode inductor; The first terminal of the first common-mode inductor is connected to the voltage input terminal, the second terminal is connected to the first terminal of the second-stage filter capacitor module, the third terminal is connected to the power ground, and the fourth terminal is connected to the second terminal of the second-stage filter capacitor module.

[0007] In the output electromagnetic compatibility circuit described in this utility model, the second-stage filter capacitor module includes a third Y capacitor, a fourth Y capacitor, a third X capacitor, and a fourth X capacitor; The third X capacitor and the fourth X capacitor are connected in parallel between the second terminal of the first common mode inductor and the fourth terminal of the first common mode inductor; The third Y capacitor is connected between the second terminal of the first common-mode inductor and the third ground point, and the fourth Y capacitor is connected between the fourth terminal of the first common-mode inductor and the third ground point.

[0008] In the output electromagnetic compatibility circuit described in this utility model, the second-stage filter inductor module includes a second common-mode inductor; The first terminal of the second common-mode inductor is connected to the voltage output terminal, the second terminal is connected to the second terminal of the first common-mode inductor, the third terminal is connected to the negative terminal of the battery, and the fourth terminal is connected to the fourth terminal of the first common-mode inductor.

[0009] In the output electromagnetic compatibility circuit described in this utility model, the third-stage filter capacitor module includes a fifth Y capacitor, a sixth Y capacitor, a fifth X capacitor, and a sixth X capacitor; The fifth X capacitor is connected between the voltage output terminal and the negative terminal of the battery; The sixth X capacitor is connected between the positive terminal and the negative terminal of the battery; The fifth Y capacitor is connected between the positive terminal of the battery and the fourth grounding point; The sixth Y capacitor is connected between the negative terminal of the battery and the fourth grounding point.

[0010] The output electromagnetic compatibility circuit of this utility model further includes multiple busbars; the multiple busbars are respectively connected to the first end, the second end and the third end of the first common mode inductor, and the first end, the third end and the fourth end of the second common mode inductor.

[0011] The output electromagnetic compatibility circuit of this utility model further includes a first filter capacitor unit, a second filter capacitor unit, and a third filter capacitor unit. The first filter capacitor unit is connected between the first terminal and the third terminal of the first common-mode inductor; The second filter capacitor unit is connected between the second and fourth terminals of the first common-mode inductor; The third filter capacitor unit is connected between the second and fourth terminals of the second common-mode inductor.

[0012] The output electromagnetic compatibility circuit of this utility model further includes a circuit board; the output electromagnetic compatibility circuit is mounted on the circuit board; The first common-mode inductor and the second common-mode inductor are arranged at the center of the first surface of the circuit board; The first X capacitor and the second X capacitor are disposed on the first side of the first common mode inductor away from the second common mode inductor; the third X capacitor and the fourth X capacitor are disposed between the first common mode inductor and the second common mode inductor; and the fifth X capacitor and the sixth X capacitor are disposed on the first side of the second common mode inductor away from the first common mode inductor. The first Y capacitor, the third Y capacitor, and the fourth Y capacitor are arranged side by side on the second side of the first common mode inductor and the second common mode inductor. The second side of the first common mode inductor is perpendicular to the first side of the first common mode inductor, and the second side of the second common mode inductor is perpendicular to the first side of the second common mode inductor. The fifth Y capacitor and the sixth Y capacitor are disposed at both ends of the first side of the circuit board; The second Y capacitor is disposed in the middle of the second side of the circuit board; The first side of the circuit board is perpendicular to the second side of the circuit board.

[0013] In the output electromagnetic compatibility circuit described in this utility model, a relay is provided on the side of the first X capacitor and the second X capacitor away from the first common mode inductor; Some busbars are arranged around the relay, some busbars are arranged between the first common-mode inductor and the second Y capacitor, and some busbars are arranged around the second common-mode inductor and the sixth X capacitor.

[0014] The output electromagnetic compatibility circuit of this invention includes a first-stage filter capacitor module, a first-stage filter inductor module, a second-stage filter capacitor module, a second-stage filter inductor module, and a third-stage filter capacitor module. The first-stage filter capacitor module is connected between the voltage input terminal and the power ground, and the third-stage filter capacitor module is connected between the positive and negative terminals of the battery. The first-stage filter inductor module, the second-stage filter capacitor module, and the second-stage filter inductor module are sequentially connected between the first-stage filter capacitor module and the third-stage filter capacitor module. This invention achieves effective multi-stage filtering by setting up multiple filter capacitor modules and filter inductor modules, thus achieving better electromagnetic compatibility. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic block diagram of a preferred embodiment of the output electromagnetic compatibility circuit of this utility model; Figure 2 This is a circuit diagram of a preferred embodiment of the output electromagnetic compatibility circuit of this utility model; Figure 3 This is a schematic diagram of the top-level layout of the circuit board of a preferred embodiment of the output electromagnetic compatibility circuit of this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] Figure 1 This is a schematic block diagram of a preferred embodiment of the output electromagnetic compatibility circuit of this utility model. (See diagram for example.) Figure 1 As shown, the output electromagnetic compatibility circuit of this utility model includes a first-stage filter capacitor module 100, a first-stage filter inductor module 200, a second-stage filter capacitor module 300, a second-stage filter inductor module 400, and a third-stage filter capacitor module 500. The first-stage filter capacitor module 100 is connected between the voltage input terminal (i.e., the output voltage terminal of the charging module) and the power ground. The third-stage filter capacitor module is connected between the positive terminal and the negative terminal of the battery. The first-stage filter inductor module 200, the second-stage filter capacitor module 300, and the second-stage filter inductor module 400 are sequentially connected between the first-stage filter capacitor module 100 and the third-stage filter capacitor module.

[0018] The output electromagnetic compatibility circuit of this invention is typically connected to the output voltage terminal of the charging module to effectively filter the output voltage of the charging module through multiple stages, thereby achieving better electromagnetic compatibility.

[0019] The output electromagnetic compatibility circuit of this invention includes a first-stage filter capacitor module, a first-stage filter inductor module, a second-stage filter capacitor module, a second-stage filter inductor module, and a third-stage filter capacitor module. The first-stage filter capacitor module is connected between the voltage input terminal and the power ground, and the third-stage filter capacitor module is connected between the positive and negative terminals of the battery. The first-stage filter inductor module, the second-stage filter capacitor module, and the second-stage filter inductor module are sequentially connected between the first-stage filter capacitor module and the third-stage filter capacitor module. This invention achieves effective multi-stage filtering by setting up multiple filter capacitor modules and filter inductor modules, thus achieving better electromagnetic compatibility.

[0020] Figure 2This is a circuit diagram of a preferred embodiment of the output electromagnetic compatibility circuit of this utility model. (See diagram for example.) Figure 2 As shown, the first-stage filter capacitor module 100 includes Y capacitor C125, Y capacitor C126, X capacitor C3, and X capacitor C4; Y capacitor C125 is connected between the voltage input terminal Vout-input and the first ground point Y5, and Y capacitor C126 is connected between the power ground AGND and the second ground point Y3; X capacitor C3 and X capacitor C4 are connected in parallel between the voltage input terminal Vout-input and the power ground AGND. The first-stage filter inductor module 200 includes a common-mode inductor L5; the first end of the common-mode inductor L5 is connected to the voltage input terminal Vout-input, the second end is connected to the first end of the second-stage filter capacitor module 300 (the first end of X capacitor C1 and X capacitor C5), the third end is connected to the power ground AGND, and the fourth end is connected to the second end of the second-stage filter capacitor module 300 (the second end of X capacitor C1 and X capacitor C5). The second-stage filter capacitor module 300 includes Y capacitor C14, Y capacitor C13, X capacitor C1, and X capacitor C5; X capacitor C1 and X capacitor C5 are connected in parallel between the second terminal and the fourth terminal of the common-mode inductor L5; Y capacitor C14 is connected between the second terminal of the common-mode inductor L5 and the third ground point Y4, and Y capacitor C13 is connected between the fourth terminal of the common-mode inductor L5 and the third ground point Y4. The second-stage filter inductor module 400 includes a common-mode inductor L6; the first terminal of the common-mode inductor L6 is connected to the voltage output terminal Vout, the second terminal is connected to the second terminal of the common-mode inductor L5, the third terminal is connected to the negative terminal of the battery, and the fourth terminal is connected to the fourth terminal of the common-mode inductor L5. The third-stage filter capacitor module 500 includes Y capacitor C51, Y capacitor C45, a fifth X capacitor, and X capacitor C25; X capacitor C29 is connected between the voltage output terminal Vout and the battery negative terminal Vbat-; X capacitor C25 is connected between the battery positive terminal Vbat+ and the battery negative terminal Vbat-; Y capacitor C51 is connected between the battery positive terminal Vbat+ and the fourth grounding point Y6 / Y2; Y capacitor C45 is connected between the battery negative terminal Vbat- and the fourth grounding point Y6 / Y2. In this preferred embodiment, all grounding points are connected to the PE ground of the casing.

[0021] In this preferred embodiment, a multi-stage filtering method combining X capacitors, common-mode inductors, and Y capacitors can further improve the overall EMC performance.

[0022] Further as Figure 2As shown, the output electromagnetic compatibility circuit of this utility model further includes a first filter capacitor unit, a second filter capacitor unit, and a third filter capacitor unit. The first filter capacitor unit is connected between the first and third terminals of the common-mode inductor L5; the second filter capacitor unit is connected between the second and fourth terminals of the common-mode inductor L5; and the third filter capacitor unit is connected between the second and fourth terminals of the common-mode inductor L6. In this preferred embodiment, each filter unit may include multiple series capacitors. For example, the first filter capacitor unit includes series capacitors C455, C362, and C363; the second filter capacitor unit includes series capacitors C457, C59, and C67; and the third filter capacitor unit includes series capacitors C108, C70, and C73. These filter capacitors can filter out circuit noise.

[0023] Further as Figure 2 As shown, the output electromagnetic compatibility circuit of this utility model further includes multiple busbars 610-660; the multiple busbars 610-660 are respectively connected to the first, second, and third terminals of the common-mode inductor L5, and the first, third, and fourth terminals of the common-mode inductor L6. In this preferred embodiment, by configuring busbars in the high-current flow area of ​​the circuit, the overcurrent capacity and stability of the circuit board are significantly improved, and the heat generated during overcurrent is reduced. The arrangement of a large number of busbars enhances the current transmission capacity, improves the overcurrent capacity in the effective copper space, significantly reduces the parasitic parameters of the line, and reduces the phenomenon of local overheating. Compared with traditional wiring design, this scheme can effectively optimize the current distribution inside the module, alleviate the phenomenon of severe heat generation in the high-current area, and significantly improve the overall stability of the module.

[0024] Further as Figure 2 As shown, the output electromagnetic compatibility circuit of this utility model further includes an output current sampling circuit, which includes output current sampling resistors R5, R6, R7, R9, and R4. This circuit feeds the sampled current back to the output current sampling operational amplifier to control the output current of the charging module. The charging module can use relays K1, K2, and K4 to achieve high and low voltage switching of the output voltage. The output electromagnetic compatibility circuit of this utility model can also further include a battery voltage sampling operational amplifier to sample the battery voltage of the charging module. The output electromagnetic compatibility circuit of this utility model can also further include a discharge circuit for discharging energy from the internal capacitors of the module when the charging module is powered off. The output electromagnetic compatibility circuit of this utility model can also further include a CAN transceiver for external communication with the module power supply; and an emergency stop circuit test point for emergency stop operation of the charging module in case of emergency.

[0025] In this preferred embodiment, the output electromagnetic compatibility circuit of this invention employs a multi-stage filtering method combining X capacitors, common-mode inductors, and Y capacitors to improve the overall EMC performance. It also includes a relay circuit for output voltage switching, used for high / low mode switching of the charging module's output voltage; a battery voltage sampling circuit for sampling the battery voltage; an output current sampling circuit for controlling the output current of the charging module; a discharge circuit for discharging energy from the internal capacitors when the charging module is powered off; a CAN communication circuit for external communication with the module's power supply; and an emergency stop circuit for emergency stop operation of the charging module in case of emergency. The output electromagnetic compatibility circuit of this utility model is suitable for a 60kW high-power charging module, making the module more suitable for high-power application scenarios such as electric vehicle charging piles and improving the overall performance of the charging pile.

[0026] Figure 3 This is a schematic diagram of the top-level layout of the circuit board of a preferred embodiment of the output electromagnetic compatibility circuit of this utility model. (Using...) Figure 3 The layout shown can effectively reduce the area of ​​the circuit board.

[0027] like Figure 3 As shown, the output electromagnetic compatibility circuit is mounted on a circuit board; the common-mode inductor L5 and the common-mode inductor L6 are arranged at the center of the first surface of the circuit board; the X capacitors C3 and C4 are disposed on the first side of the common-mode inductor L5 away from the common-mode inductor L6, the X capacitors C1 and C5 are disposed between the common-mode inductor L5 and the common-mode inductor L6, and the X capacitors C29 and C25 are disposed on the first side of the common-mode inductor L6 away from the common-mode inductor L5; the Y capacitor C125... Y capacitors C14 and C13 are arranged side-by-side on the second side of common-mode inductor L5 and the second side of common-mode inductor L6, respectively. The second side of common-mode inductor L5 is perpendicular to the first side of common-mode inductor L5, and the second side of common-mode inductor L6 is perpendicular to the first side of common-mode inductor L6. Y capacitors C51 and C45 are located at both ends of the first side of the circuit board. Y capacitor C126 is located in the middle of the second side of the circuit board. The first side of the circuit board is perpendicular to the second side of the circuit board. Relays K1 to K4 are arranged on the side of X capacitors C3 and C4 away from common-mode inductor L5. Some busbars are arranged around relays K1 to K4, some busbars are arranged between common-mode inductor L5 and Y capacitor C126, and some busbars are arranged around common-mode inductor L6 and X capacitor C25.

[0028] Although this utility model has been described through specific embodiments, those skilled in the art should understand that various modifications and equivalent substitutions can be made to this utility model without departing from its scope. Furthermore, various modifications can be made to this utility model for specific situations or materials without departing from its scope. Therefore, this utility model is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims of this utility model.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An output electromagnetic compatibility circuit, characterized in that, It includes a first-stage filter capacitor module, a first-stage filter inductor module, a second-stage filter capacitor module, a second-stage filter inductor module, and a third-stage filter capacitor module; The first-stage filter capacitor module is connected between the voltage input terminal and the power ground. The third-stage filter capacitor module is connected between the positive and negative terminals of the battery. The first-stage filter inductor module, the second-stage filter capacitor module, and the second-stage filter inductor module are connected sequentially between the first-stage filter capacitor module and the third-stage filter capacitor module.

2. The output electromagnetic compatibility circuit according to claim 1, characterized in that, The first-stage filter capacitor module includes a first Y capacitor, a second Y capacitor, a first X capacitor, and a second X capacitor; The first Y capacitor is connected between the voltage input terminal and the first ground point, and the second Y capacitor is connected between the power ground and the second ground point; The first X capacitor and the second X capacitor are connected in parallel between the voltage input terminal and the power ground.

3. The output electromagnetic compatibility circuit according to claim 2, characterized in that, The first-stage filter inductor module includes a first common-mode inductor; The first terminal of the first common-mode inductor is connected to the voltage input terminal, the second terminal is connected to the first terminal of the second-stage filter capacitor module, the third terminal is connected to the power ground, and the fourth terminal is connected to the second terminal of the second-stage filter capacitor module.

4. The output electromagnetic compatibility circuit according to claim 3, characterized in that, The second-stage filter capacitor module includes a third Y capacitor, a fourth Y capacitor, a third X capacitor, and a fourth X capacitor; The third X capacitor and the fourth X capacitor are connected in parallel between the second terminal of the first common mode inductor and the fourth terminal of the first common mode inductor; The third Y capacitor is connected between the second terminal of the first common-mode inductor and the third ground point, and the fourth Y capacitor is connected between the fourth terminal of the first common-mode inductor and the third ground point.

5. The output electromagnetic compatibility circuit according to claim 4, characterized in that, The second-stage filter inductor module includes a second common-mode inductor; The first terminal of the second common-mode inductor is connected to the voltage output terminal, the second terminal is connected to the second terminal of the first common-mode inductor, the third terminal is connected to the negative terminal of the battery, and the fourth terminal is connected to the fourth terminal of the first common-mode inductor.

6. The output electromagnetic compatibility circuit according to claim 5, characterized in that, The third-stage filter capacitor module includes a fifth Y capacitor, a sixth Y capacitor, a fifth X capacitor, and a sixth X capacitor; The fifth X capacitor is connected between the voltage output terminal and the negative terminal of the battery; The sixth X capacitor is connected between the positive terminal and the negative terminal of the battery; The fifth Y capacitor is connected between the positive terminal of the battery and the fourth grounding point; The sixth Y capacitor is connected between the negative terminal of the battery and the fourth grounding point.

7. The output electromagnetic compatibility circuit according to claim 6, characterized in that, It further includes multiple busbars; the multiple busbars are respectively connected to the first, second and third ends of the first common mode inductor, and the first, third and fourth ends of the second common mode inductor.

8. The output electromagnetic compatibility circuit according to claim 7, characterized in that, It further includes a first filter capacitor unit, a second filter capacitor unit, and a third filter capacitor unit; The first filter capacitor unit is connected between the first terminal and the third terminal of the first common-mode inductor; The second filter capacitor unit is connected between the second and fourth terminals of the first common-mode inductor; The third filter capacitor unit is connected between the second and fourth terminals of the second common-mode inductor.

9. The output electromagnetic compatibility circuit according to claim 8, characterized in that, The circuit board is further included; the output electromagnetic compatibility circuit is mounted on the circuit board. The first common-mode inductor and the second common-mode inductor are arranged at the center of the first surface of the circuit board; The first X capacitor and the second X capacitor are disposed on the first side of the first common mode inductor away from the second common mode inductor; the third X capacitor and the fourth X capacitor are disposed between the first common mode inductor and the second common mode inductor; and the fifth X capacitor and the sixth X capacitor are disposed on the first side of the second common mode inductor away from the first common mode inductor. The first Y capacitor, the third Y capacitor, and the fourth Y capacitor are arranged side by side on the second side of the first common mode inductor and the second common mode inductor. The second side of the first common mode inductor is perpendicular to the first side of the first common mode inductor, and the second side of the second common mode inductor is perpendicular to the first side of the second common mode inductor. The fifth Y capacitor and the sixth Y capacitor are disposed at both ends of the first side of the circuit board; The second Y capacitor is disposed in the middle of the second side of the circuit board; The first side of the circuit board is perpendicular to the second side of the circuit board.

10. The output electromagnetic compatibility circuit according to claim 9, characterized in that, A relay is disposed on the side of the first X capacitor and the second X capacitor away from the first common mode inductor; Some busbars are arranged around the relay, some busbars are arranged between the first common-mode inductor and the second Y capacitor, and some busbars are arranged around the second common-mode inductor and the sixth X capacitor.

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