A frequency converter

Abstract

This utility model discloses a frequency converter controller, including a control unit, a first filtering topology, and a second filtering topology. The first filtering topology includes a differential-mode inductor unit, and the second filtering topology includes a common-mode inductor unit. The first filtering topology is connected to the live wire, neutral wire, and protective ground wire, and receives the input signal from the power input terminal, suppresses the differential-mode noise and common-mode noise of the input signal from the power input terminal, and generates a first electrical signal. The second filtering topology receives the first electrical signal, suppresses the differential-mode noise and common-mode noise of the first electrical signal, and generates a second electrical signal. The control unit receives the second electrical signal. Because a differential-mode inductor unit is added to the first filtering topology, the number of magnetic rings can be reduced, the number of installation steps can be reduced, and costs can be optimized.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and in particular to a frequency converter controller. Background Technology

[0002] In existing technologies, to improve the electromagnetic interference (EMI) performance of frequency converters, ferrite cores are wound around the wiring harness at the power input terminal of the frequency converter. These cores, along with capacitors and common-mode inductors, suppress noise signals in the input electrical signal. However, winding ferrite cores around the wiring harness increases the number of steps in the overall installation process and is also more expensive. Summary of the Invention

[0003] This utility model provides a frequency converter to solve the problems of complex operation and high cost caused by winding a magnetic ring on the wiring harness at the power input terminal of the frequency converter and suppressing noise signals in the input electrical signal through the magnetic ring, capacitor and common mode inductor.

[0004] This utility model provides a frequency converter, including: a first filtering topology, a second filtering topology, and a control unit, wherein the first filtering topology includes a differential mode inductor unit, and the second filtering topology includes a common mode inductor unit;

[0005] The first filtering topology connects the live wire, neutral wire, and protective ground wire, and receives the input signal from the power input terminal. It suppresses the differential-mode noise and common-mode noise of the input signal from the power input terminal and generates the first electrical signal.

[0006] The second filtering topology receives the first electrical signal, suppresses the differential-mode noise and common-mode noise of the first electrical signal, and generates the second electrical signal;

[0007] The control unit receives the second electrical signal.

[0008] Preferably, the differential mode inductor unit includes a first differential mode inductor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor;

[0009] The first terminal of the first differential mode inductor is electrically connected to the live wire, and the second terminal of the first differential mode inductor is electrically connected to the first terminal of the second filter topology.

[0010] The first terminal of the first capacitor and the first terminal of the second capacitor are respectively connected to the first terminal of the first differential mode inductor and the second terminal of the first differential mode inductor.

[0011] The first terminal of the third capacitor, the first terminal of the fourth capacitor, and the second terminal of the second filter topology are electrically connected to the neutral wire, respectively.

[0012] The second terminal of the first capacitor, the second terminal of the second capacitor, the second terminal of the third capacitor, the second terminal of the fourth capacitor, and the protective ground wire are electrically connected.

[0013] Preferably, the differential mode inductor unit includes a second differential mode inductor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor;

[0014] The first terminal of the first capacitor, the first terminal of the second capacitor, and the first terminal of the second filter topology are electrically connected to the live wire.

[0015] The first terminal of the third capacitor and the first terminal of the fourth capacitor are respectively connected to the first terminal of the second differential mode inductor and the second terminal of the second differential mode inductor.

[0016] The second terminal of the first capacitor, the second terminal of the second capacitor, the second terminal of the third capacitor, the second terminal of the fourth capacitor, and the protective ground terminal are electrically connected.

[0017] The first terminal of the second differential mode inductor is electrically connected to the live wire, and the second terminal of the second differential mode inductor is electrically connected to the second terminal of the second filter topology.

[0018] Preferably, the differential mode inductor unit includes a first differential mode inductor, a second differential mode inductor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor;

[0019] The first terminal of the first differential mode inductor is electrically connected to the neutral line, and the second terminal of the first differential mode inductor is electrically connected to the first terminal of the second filter topology.

[0020] The first terminal of the first capacitor and the first terminal of the second capacitor are respectively connected to the first terminal of the first differential mode inductor and the second terminal of the first differential mode inductor.

[0021] The first terminal of the third capacitor and the first terminal of the fourth capacitor are respectively connected to the first terminal of the second differential mode inductor and the second terminal of the second differential mode inductor.

[0022] The second terminal of the first capacitor, the second terminal of the second capacitor, the second terminal of the third capacitor, the second terminal of the fourth capacitor, and the protective ground wire are electrically connected.

[0023] The first terminal of the second differential mode inductor is electrically connected to the neutral line, and the second terminal of the second differential mode inductor is electrically connected to the second terminal of the second filter topology.

[0024] Preferably, the first differential mode inductor is in a surface mount package.

[0025] Preferably, the second differential mode inductor is in a surface mount package.

[0026] Preferably, the common-mode inductor unit includes a first common-mode inductor, a fifth capacitor, and a sixth capacitor;

[0027] The first terminal and the second terminal of the first common-mode inductor are electrically connected to the first terminal and the second terminal of the second filter topology, respectively. The third terminal and the fourth terminal of the first common-mode inductor are used as the voltage output terminal and the ground terminal, respectively.

[0028] The fifth capacitor is connected between the first terminal of the second filter topology and the second terminal of the second filter topology.

[0029] The sixth capacitor is connected between the voltage output terminal and the ground terminal.

[0030] Preferably, the common-mode inductor unit includes a first common-mode inductor, a second common-mode inductor, a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor;

[0031] The first terminal of the first common-mode inductor and the second terminal of the first common-mode inductor are electrically connected to the first terminal of the second filter topology and the second terminal of the second filter topology, respectively.

[0032] The third and fourth terminals of the first common-mode inductor are electrically connected to the first and second terminals of the second common-mode inductor, respectively.

[0033] The third and fourth terminals of the second common-mode inductor are used as the voltage output terminal and ground terminal, respectively.

[0034] The fifth capacitor is connected between the first terminal of the second filter topology and the second terminal of the second filter topology.

[0035] The sixth capacitor is connected between the first terminal of the second common-mode inductor and the second terminal of the second common-mode inductor;

[0036] The seventh capacitor is connected between the first terminal of the second common-mode inductor and the second terminal of the second common-mode inductor;

[0037] The eighth capacitor is connected between the voltage output terminal and the ground terminal.

[0038] The beneficial effects of this utility model are as follows:

[0039] The frequency converter controller provided by this utility model includes a control unit, a first filtering topology, and a second filtering topology. The first filtering topology includes a differential-mode inductor unit, and the second filtering topology includes a common-mode inductor unit. The first filtering topology is connected to the live wire, neutral wire, and protective ground wire, and receives the input signal from the power input terminal, suppresses the differential-mode noise and common-mode noise of the input signal from the power input terminal, and generates a first electrical signal. The second filtering topology receives the first electrical signal, suppresses the differential-mode noise and common-mode noise of the first electrical signal, and generates a second electrical signal. The control unit receives the second electrical signal. Because a differential-mode inductor unit is added to the first filtering topology, the number of magnetic rings can be reduced, the number of installation steps can be reduced, costs can be optimized, and the production efficiency of the frequency converter controller can be improved. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 A schematic diagram of the structure of a frequency converter controller provided in an embodiment of this utility model;

[0042] Figure 2 A schematic diagram of another frequency converter provided in this embodiment of the present invention;

[0043] Figure 3 A schematic diagram of another frequency converter provided in this embodiment of the present invention;

[0044] Figure 4 A schematic diagram of another frequency converter provided in this embodiment of the present invention;

[0045] Figure 5 A schematic diagram of another frequency converter provided in this embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of another frequency converter provided in an embodiment of the present invention. Detailed Implementation

[0047] 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. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0048] The frequency converter provided in this embodiment adds a first filter topology and a second filter topology to the power input terminal of the frequency converter. The first filter topology includes a differential mode inductor unit, and the second filter topology includes a common mode inductor unit. By adding a differential mode inductor unit to the first filter topology, the magnetic ring can be reduced, the installation steps of the whole machine can be reduced, and the cost can be optimized.

[0049] The frequency converter provided in the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0050] like Figure 1 The diagram shown is a structural schematic of a frequency converter according to an embodiment of the present invention. Figure 1As can be seen from the above, the frequency converter includes a first filtering topology, a second filtering topology, and a control unit 11. The first filtering topology includes a differential mode inductor unit 12, and the second filtering topology includes a common mode inductor unit 13.

[0051] The first filtering topology connects the live wire L, neutral wire N, and protective ground wire PE, and receives the input signal from the power input terminal, suppresses the differential-mode noise and common-mode noise of the input signal from the power input terminal, and generates a first electrical signal; the second filtering topology receives the first electrical signal, suppresses the differential-mode noise and common-mode noise of the first electrical signal, and generates a second electrical signal; the control unit 11 receives the second electrical signal.

[0052] The first terminal of the first filter topology is electrically connected to the live wire L, the second terminal of the first filter topology is electrically connected to the neutral wire N, the third terminal of the first filter topology is electrically connected to the protective ground wire PE, the fourth terminal of the first filter topology is electrically connected to the first terminal of the second filter topology, the fifth terminal of the first filter topology is electrically connected to the second terminal of the second filter topology, the third terminal of the second filter topology serves as the voltage output terminal, and the fourth terminal of the second filter topology serves as the ground terminal.

[0053] The first, second, and third ends of the first filter topology serve as the power input terminals of the frequency converter.

[0054] The first filtering topology is used to suppress differential-mode noise and common-mode noise in the input signal input from the power input terminal and generate a first electrical signal.

[0055] The second filtering topology is used to suppress the common-mode and differential-mode signals in the first electrical signal, generate the second electrical signal, and output the second electrical signal to the control unit 11.

[0056] In this embodiment of the invention, a differential-mode inductor unit is added to the first filter topology to suppress noise in the signal, thereby reducing the number of magnetic rings wound on the live and neutral wires, reducing the number of installation steps, and lowering costs.

[0057] The frequency converter in this embodiment of the invention can be input to single-phase AC power.

[0058] In specific implementation, the differential-mode inductor unit 12 in the first filtering topology and the common-mode inductor unit 13 in the second filtering topology can both suppress differential-mode noise and common-mode noise in the signal. The differential-mode inductor unit 12 in the first filtering topology mainly suppresses differential-mode noise in the signal, while the common-mode inductor unit 13 in the second filtering topology mainly suppresses common-mode signals in the signal.

[0059] In one embodiment, such as Figure 1As shown, the differential mode inductor unit 12 includes a first differential mode inductor L1, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4; the first terminal of the first differential mode inductor L1 is electrically connected to the live wire L, and the second terminal of the first differential mode inductor L1 is electrically connected to the first terminal of the second filter topology.

[0060] The first terminal of the first capacitor C1 and the first terminal of the second capacitor C2 are respectively connected to the first terminal of the first differential mode inductor L1 and the second terminal of the first differential mode inductor L1; the first terminal of the third capacitor C3, the first terminal of the fourth capacitor C4, and the second terminal of the second filter topology are respectively electrically connected to the neutral line N; the second terminals of the first capacitor C1, the second terminal of the second capacitor C2, the second terminal of the third capacitor C3, and the second terminal of the fourth capacitor C4 are electrically connected to the protective ground line PE.

[0061] In this embodiment of the present invention, a first differential mode inductor L1 is added to the stage after the first end of the first filter topology. The first differential mode inductor L1, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 constitute the differential mode inductor unit in the first filter topology, thereby suppressing the differential mode noise and common mode noise in the input signal input from the power input terminal, thereby reducing the magnetic ring wound at the power input terminal for noise suppression in related technologies.

[0062] In another embodiment, such as Figure 2 As shown, the differential mode inductor unit 12 includes a second differential mode inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4; the first terminal of the first capacitor C1, the first terminal of the second capacitor C2, and the first terminal of the second filter topology are electrically connected to the live wire L.

[0063] The first terminal of the third capacitor C3 and the first terminal of the fourth capacitor C4 are respectively connected to the first terminal of the second differential mode inductor L2 and the second terminal of the second differential mode inductor L2.

[0064] The second terminal of the first capacitor C1, the second terminal of the second capacitor C2, the second terminal of the third capacitor C3, the second terminal of the fourth capacitor C4, and the protective ground terminal PE are electrically connected.

[0065] The first terminal of the second differential mode inductor L2 is electrically connected to the neutral line N, and the second terminal of the second differential mode inductor L2 is electrically connected to the second terminal of the second filter topology.

[0066] In this embodiment of the invention, a second differential mode inductor L2 is added after the second stage of the first filter topology. The second differential mode inductor L2, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 constitute the differential mode inductor unit in the first filter topology, thereby suppressing the differential mode noise and common mode noise in the input signal input from the power input terminal. This reduces the need for the magnetic ring wound around the power input terminal to suppress noise interference in related technologies.

[0067] In another embodiment, such as Figure 3 As shown, the differential mode inductor unit 12 includes a first differential mode inductor L1, a second differential mode inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4.

[0068] The first terminal of the first differential mode inductor L1 is electrically connected to the live wire L, and the second terminal of the first differential mode inductor L1 is electrically connected to the first terminal of the second filter topology; the first terminals of the first capacitor C1 and the second capacitor C2 are respectively connected to the first terminal and the second terminal of the first differential mode inductor L1; the first terminals of the third capacitor C3 and the fourth capacitor C4 are respectively connected to the first terminal and the second terminal of the second differential mode inductor L2; the second terminals of the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are electrically connected to the protective ground wire PE.

[0069] The first terminal of the second differential mode inductor L2 is electrically connected to the neutral line N, and the second terminal of the second differential mode inductor L2 is electrically connected to the second terminal of the second filter topology.

[0070] In this embodiment of the invention, a first differential mode inductor L1 is added to the stage following the first end of the first filter topology, and a second differential mode inductor L2 is added to the stage following the second end of the first filter topology. The first differential mode inductor L1, the second differential mode inductor L2, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 constitute the differential mode inductor unit in the first filter topology, thereby suppressing differential mode noise and common mode noise in the input signal input from the power input terminal, and reducing the magnetic ring wound at the power input terminal for noise suppression in related technologies.

[0071] In practice, the first differential mode inductor L1 is packaged in a surface mount package, and / or the second differential mode inductor L2 is packaged in a surface mount package, thereby reducing costs and improving production efficiency.

[0072] The above describes the specific circuit of the first filtering topology in the embodiments of this utility model. The specific circuit of the second filtering topology in the embodiments of this utility model will be described in detail below.

[0073] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the common-mode inductor unit 13 includes a first common-mode inductor L3, a fifth capacitor C5, and a sixth capacitor C6;

[0074] The first and second terminals of the first common-mode inductor L3 are electrically connected to the first and second terminals of the second filter topology, respectively. The third and fourth terminals of the first common-mode inductor L3 serve as the voltage output terminal Vout and the ground terminal GND, respectively. The fifth capacitor C5 is connected between the first and second terminals of the second filter topology. The sixth capacitor C6 is connected between the voltage output terminal Vout and the ground terminal GND.

[0075] In another embodiment, refer to Figure 4 , Figure 5 and Figure 6 The common-mode inductor unit 13 includes a first common-mode inductor L3, a second common-mode inductor L4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8.

[0076] The first and second terminals of the first common-mode inductor L3 are electrically connected to the first and second terminals of the second filter topology, respectively. The third and fourth terminals of the first common-mode inductor L3 are electrically connected to the first and second terminals of the second common-mode inductor L4, respectively. The third and fourth terminals of the second common-mode inductor L4 serve as the voltage output terminal Vout and the ground terminal GND, respectively. The fifth capacitor C5 is connected between the first and second terminals of the second filter topology. The sixth capacitor C6 is connected between the first and second terminals of the second common-mode inductor L4. The seventh capacitor C7 is connected between the first and second terminals of the second common-mode inductor L4. The eighth capacitor C8 is connected between the voltage output terminal Vout and the ground terminal GND.

[0077] The frequency converter controller disclosed in this utility model comprises a first and second filtering topology, forming a two-stage filtering topology. This optimizes EMI performance, with a particularly noticeable effect on frequency conversions around 2MHz. It also simplifies installation costs and reduces the cost of the frequency converter driver. All components in both the first and second filtering topologies are located on the same printed circuit board (PCB), eliminating the need for an external ferrite core and thus reducing the number of steps required for overall installation and lowering costs.

[0078] Those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A frequency converter, characterized in that, include: A first filtering topology, a second filtering topology, and a control unit, wherein the first filtering topology includes a differential-mode inductor unit, and the second filtering topology includes a common-mode inductor unit; The first filtering topology connects the live wire, neutral wire, and protective ground wire, and receives the input signal from the power input terminal, suppresses the differential-mode noise and common-mode noise of the input signal from the power input terminal, and generates a first electrical signal; The second filtering topology receives the first electrical signal, suppresses the differential-mode noise and common-mode noise of the first electrical signal, and generates the second electrical signal; The control unit receives the second electrical signal.

2. The frequency converter as described in claim 1, characterized in that, The differential mode inductor unit includes a first differential mode inductor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; The first terminal of the first differential mode inductor is electrically connected to the live wire, and the second terminal of the first differential mode inductor is electrically connected to the first terminal of the second filter topology. The first terminal of the first capacitor and the first terminal of the second capacitor are respectively connected to the first terminal of the first differential mode inductor and the second terminal of the first differential mode inductor; The first terminal of the third capacitor, the first terminal of the fourth capacitor, and the second terminal of the second filter topology are respectively electrically connected to the neutral wire; The second terminal of the first capacitor, the second terminal of the second capacitor, the second terminal of the third capacitor, the second terminal of the fourth capacitor, and the protective ground wire are electrically connected.

3. The frequency converter as described in claim 1, characterized in that, The differential mode inductor unit includes a second differential mode inductor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; The first terminal of the first capacitor, the first terminal of the second capacitor, and the first terminal of the second filter topology are electrically connected to the live wire. The first terminal of the third capacitor and the first terminal of the fourth capacitor are respectively connected to the first terminal of the second differential mode inductor and the second terminal of the second differential mode inductor. The second terminal of the first capacitor, the second terminal of the second capacitor, the second terminal of the third capacitor, the second terminal of the fourth capacitor, and the protective ground wire are electrically connected; The first end of the second differential mode inductor is electrically connected to the neutral line, and the second end of the second differential mode inductor is electrically connected to the second end of the second filter topology.

4. The frequency converter as described in claim 1, characterized in that, The differential mode inductor unit includes a first differential mode inductor, a second differential mode inductor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; The first terminal of the first differential mode inductor is electrically connected to the live wire, and the second terminal of the first differential mode inductor is electrically connected to the first terminal of the second filter topology. The first terminal of the first capacitor and the first terminal of the second capacitor are respectively connected to the first terminal of the first differential mode inductor and the second terminal of the first differential mode inductor. The first terminal of the third capacitor and the first terminal of the fourth capacitor are respectively connected to the first terminal of the second differential mode inductor and the second terminal of the second differential mode inductor. The second terminal of the first capacitor, the second terminal of the second capacitor, the second terminal of the third capacitor, the second terminal of the fourth capacitor, and the protective ground wire are electrically connected; The first end of the second differential mode inductor is electrically connected to the neutral line, and the second end of the second differential mode inductor is electrically connected to the second end of the second filter topology.

5. The frequency converter as described in claim 2 or 4, characterized in that, The first differential mode inductor is a surface mount package.

6. The frequency converter as described in claim 3 or 4, characterized in that, The second differential mode inductor is a surface mount package.

7. The frequency converter as described in any one of claims 2 to 4, characterized in that, The common-mode inductor unit includes a first common-mode inductor, a fifth capacitor, and a sixth capacitor; The first terminal and the second terminal of the first common-mode inductor are electrically connected to the first terminal and the second terminal of the second filter topology, respectively. The third terminal and the fourth terminal of the first common-mode inductor are used as the voltage output terminal and the ground terminal, respectively. The fifth capacitor is connected between the first end of the second filter topology and the second end of the second filter topology; The sixth capacitor is connected between the voltage output terminal and the ground terminal.

8. The frequency converter as described in any one of claims 2 to 4, characterized in that, The common-mode inductor unit includes a first common-mode inductor, a second common-mode inductor, a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor; The first terminal of the first common-mode inductor and the second terminal of the first common-mode inductor are electrically connected to the first terminal of the second filter topology and the second terminal of the second filter topology, respectively. The third and fourth terminals of the first common-mode inductor are electrically connected to the first and second terminals of the second common-mode inductor, respectively. The third and fourth terminals of the second common-mode inductor are used as the voltage output terminal and ground terminal, respectively. The fifth capacitor is connected between the first end of the second filter topology and the second end of the second filter topology; The sixth capacitor is connected between the first terminal of the second common-mode inductor and the second terminal of the second common-mode inductor; The seventh capacitor is connected between the first terminal of the second common-mode inductor and the second terminal of the second common-mode inductor; The eighth capacitor is connected between the voltage output terminal and the ground terminal.

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