Filter circuit and air conditioning equipment

Abstract

The embodiment of the utility model provides a filter circuit and air conditioning equipment, and relates to the technical field of circuits. In the filter circuit, a third inductor and a fourth inductor are added in a live line circuit and a null line circuit, the third inductor and the fourth inductor can be a non-magnetic-ring differential mode inductor or a common mode inductor, and the third inductor and the fourth inductor are fixedly arranged on a circuit board and can be integrated in a controller box body to replace the function of an external suspension magnetic ring. The requirement for low interference degree is met, an externally suspended magnetic ring does not need to be introduced, and therefore in the transportation process, the risk that the magnetic ring collides with components is avoided, the production efficiency can be improved, and cost reduction and efficiency improvement are achieved.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and in particular to filter circuits and air conditioning equipment. Background Technology

[0002] In modern air conditioning systems, the outdoor unit controller plays a crucial role, responsible for regulating the overall operation of the system. The controller connects to the outdoor unit's power supply, and a ferrite core is inserted into the LNS connection line between the controller and the outdoor unit to suppress electromagnetic interference. This ferrite core significantly reduces the level of interference, meeting standard requirements.

[0003] However, during transportation, the externally suspended magnetic ring poses a risk of colliding with components, and it also increases production costs and reduces production efficiency.

[0004] Therefore, how to remove the externally suspended magnetic ring while meeting the requirement of low interference is a technical problem that needs to be solved. Utility Model Content

[0005] The purpose of this application is to provide a filter circuit and an air conditioning device to solve the technical problem in the prior art of how to remove the externally suspended magnetic ring while meeting the requirement of low interference.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions.

[0007] In a first aspect, embodiments of this application provide a filter circuit, including a first common-mode inductor, a first Y capacitor, a second Y capacitor, a live wire, a neutral wire, and a ground wire. The first common-mode inductor includes a first inductor and a second inductor, the first inductor being connected in series in the live wire, and the second inductor being connected in series in the neutral wire. The first Y capacitor is connected between the live wire and the ground wire, and the second Y capacitor is connected between the neutral wire and the ground wire.

[0008] The filter circuit further includes a third inductor and a fourth inductor, which are located on the circuit board. The third inductor is connected in series in the live wire, and the fourth inductor is connected in series in the neutral wire.

[0009] Optionally, both the third and fourth inductors are ringless differential-mode inductors. The ringless differential-mode inductors function as filters, replacing the original magnetic rings.

[0010] Optionally, if both the third and fourth inductors are non-magnetic ring differential-mode inductors, the filter circuit further includes an X capacitor connected between the live wire and the neutral wire. The X capacitor serves to suppress interference and filter signals.

[0011] Optionally, the third inductor and the fourth inductor form a second common-mode inductor, and the inductance of both the third and fourth inductors is less than the inductance of the first common-mode inductor. The second common-mode inductor and the first common-mode inductor constitute a two-stage filter.

[0012] Optionally, when the third inductor and the fourth inductor form the second common-mode inductor, the X capacitor can be omitted from the front-end circuit of the first common-mode inductor, that is, the X capacitor is not included in the front-end circuit of the first common-mode inductor.

[0013] Optionally, the filter circuit further includes an X capacitor;

[0014] The first end of the first inductor is used to connect to the live wire, the second end of the first inductor is used to connect to the subsequent circuit, and the first end of the first inductor is connected to the first end of the X capacitor and the first end of the first Y capacitor.

[0015] The first end of the second inductor is used to connect to the live wire, the second end of the second inductor is used to connect to the subsequent circuit, and the first end of the second inductor is connected to the second end of the X capacitor and the first end of the second Y capacitor;

[0016] The second terminal of the first Y capacitor and the second terminal of the second Y capacitor are connected to the ground line.

[0017] Optionally, the first end of the third inductor is used to connect to the live wire, and the second end of the third inductor is connected to the first end of the first inductor;

[0018] The first end of the fourth inductor is used to connect to the neutral wire, and the second end of the fourth inductor is connected to the first end of the second inductor;

[0019] The filter circuit also includes a discharge tube, with the first end of the first inductor connected to the first end of the discharge tube and the second end of the discharge tube connected to the ground line.

[0020] Optionally, the filtering circuit is connected to the controller, and the filtering circuit is located on a circuit board inside the controller housing.

[0021] Optionally, the controller housing is located inside the outer casing of the outdoor unit of the air conditioner, and the onboard terminals of the controller housing are exposed outside the outdoor unit of the air conditioner. The onboard terminals are used to directly connect to the power supply cable.

[0022] Secondly, embodiments of this application provide an air conditioning device, which includes a controller and a filter circuit as described in the first aspect.

[0023] Optionally, the air conditioning equipment is an outdoor unit, and the filtering circuit is the filtering circuit of the outdoor unit controller, which is located on a circuit board inside the controller housing. The controller housing is located inside the outer casing of the outdoor unit, and the onboard terminals of the controller housing are exposed, used for direct connection of the power supply cable.

[0024] Compared with the prior art, this application has the following advantages:

[0025] The filtering circuit provided in this application embodiment adds a third inductor and a fourth inductor to the live wire and neutral wire. The third inductor and the fourth inductor can be differential mode inductors without magnetic rings or common mode inductors. The third inductor and the fourth inductor are fixedly mounted on the circuit board and can be integrated into the controller box to replace the function of an externally suspended magnetic ring, meet the requirement of low interference level, and eliminate the need to introduce an externally suspended magnetic ring. Therefore, there is no risk of magnetic ring colliding with components during transportation, and production efficiency can be improved, achieving cost reduction and efficiency improvement. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of a filter circuit provided in an embodiment of this application, wherein the third inductor and the fourth inductor are differential mode inductors;

[0028] Figure 2 A schematic diagram of a filter circuit provided in an embodiment of this application, wherein the third inductor and the fourth inductor are common-mode inductors;

[0029] Figure 3 This application provides a schematic diagram of a filter circuit, which includes a discharge tube and the third and fourth inductors are differential mode inductors.

[0030] Figure 4 This application provides a schematic diagram of a filter circuit, which includes a discharge tube and the third and fourth inductors are common-mode inductors.

[0031] Figure 5 The diagram shows the installation of an existing outdoor unit controller, where controller 1 is installed on the windproof upright plate 2 of the outdoor unit and requires a terminal block adapter.

[0032] Figure 6This is a schematic diagram of an outdoor unit controller installation provided in an embodiment of this application. The controller 1 is installed inside the outer casing of the outdoor unit, and the onboard terminals of the controller housing are exposed, eliminating the need for terminal block adapters. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] In the description of this application, it should be noted that:

[0036] Relationship terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations;

[0037] "Connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0038] Existing outdoor unit controllers have externally suspended magnetic rings, which pose a risk of collision with components. These magnetic rings also increase production costs and reduce production efficiency.

[0039] To overcome the above problems, please refer to Figure 1 This application provides a filter circuit, including a live wire, a neutral wire, and a ground wire. The live wire is the row of lines connected by the L line in the figure, the neutral wire is the row of lines connected by the N line in the figure, and the ground wire is the row of lines connected by GND in the figure.

[0040] A first common-mode inductor IND1 is installed on the live wire and the neutral wire. The first common-mode inductor includes a first inductor and a second inductor. The first inductor is connected in series in the live wire, and the second inductor is connected in series in the neutral wire. The connection relationship is as follows:

[0041] The first end of the first inductor is used to connect to the live wire, and the second end of the first inductor is used to connect to the subsequent circuit.

[0042] The first end of the second inductor is used to connect to the live wire, and the second end of the second inductor is used to connect to the subsequent circuit.

[0043] like Figure 1 The filter circuit also includes a first Y capacitor CRV3 and a second Y capacitor CRV4. The first Y capacitor CRV3 is connected between the live wire and the ground wire, and the second Y capacitor CRV4 is connected between the neutral wire and the ground wire.

[0044] The first Y capacitor CRV3 and the second Y capacitor CRV4 can be located in the pre-amplifier circuit of the first common-mode inductor IND1, and their connection relationship is as follows:

[0045] The first terminal of the first Y capacitor is connected to the first terminal of the first inductor, the first terminal of the second Y capacitor is connected to the first terminal of the second inductor, and the second terminals of the first Y capacitor and the second Y capacitor are connected to the ground line.

[0046] The filter circuit also includes a third inductor and a fourth inductor, which are located on the circuit board. The third inductor is connected in series with the live wire, and the fourth inductor is connected in series with the neutral wire.

[0047] The third and fourth inductors can be non-magnetic toroidal differential-mode inductors, such as... Figure 1 The inductors LN and LL are shown in the diagram. A ringless differential-mode inductor can be a small-inductance wire-wound coil without a magnetic ring, making it easy to embed in a controller.

[0048] The third and fourth inductors can be placed before the first common-mode inductor IND1 for debugging purposes, thus replacing the original magnetic ring. When the third and fourth inductors are placed before the first common-mode inductor IND1, the following connection relationship exists: the first terminal of the third inductor is connected to the live wire, and the second terminal of the third inductor is connected to the first terminal of the first inductor; the first terminal of the fourth inductor is connected to the neutral wire, and the second terminal of the fourth inductor is connected to the first terminal of the second inductor.

[0049] Besides the third and fourth inductors being implementations of differential-mode inductors without magnetic rings, the third and fourth inductors can also be common-mode inductors, such as... Figure 2 The common-mode inductor IND2 is located in the first common-mode inductor IND1.

[0050] The filter circuit can be used as the filter circuit of the controller of the outdoor unit of the air conditioner. It is connected to the controller, and the filter circuit and the controller are located on the circuit board.

[0051] The components of the filter circuit, such as the third and fourth inductors, can be fixedly mounted on the circuit board, which can be integrated into the controller box. This replaces the function of the externally suspended magnetic ring, meeting the requirement of low interference. Since there is no need to introduce an externally suspended magnetic ring, there is no risk of the magnetic ring colliding with the components during transportation. It can also improve production efficiency and achieve cost reduction and efficiency improvement.

[0052] In embodiments where the third and fourth inductors are non-magnetic ring differential-mode inductors, such as Figure 3 The filter circuit may also include an X capacitor CRV2, which is connected between the live wire and the neutral wire. The first terminal of the first inductor is connected to the first terminal of the X capacitor, and the first terminal of the second inductor is connected to the second terminal of the X capacitor.

[0053] In implementations where the third and fourth inductors are common-mode inductors, such as Figure 4 , Figure 3 The X capacitor CRV2 in the middle can be removed. The third inductor and the fourth inductor form the second common mode inductor IND2. The second common mode inductor IND2 and the first common mode inductor IND1 form a two-stage filter. Under the action of the two-stage filter, the X capacitor before the first common mode inductor can be omitted.

[0054] Based on the EMI test results, the inductance of the second common-mode inductor IND2 can be adjusted. The inductances of the third and fourth inductors can both be smaller than the inductance of the first common-mode inductor. At the same time, the parameters of other components can be adjusted to achieve the anti-interference effect.

[0055] Figure 4 In the embodiment shown, since the X capacitor in the front stage of the first common mode inductor is replaced by the second common mode inductor, the X capacitor is not needed, saving controller space, and the filtering effect is obvious, stable and reliable.

[0056] Continue to refer to Figure 3 or Figure 4 A fuse FUSE1 can also be installed on the live wire. In the event of a short circuit, if the current in the live wire is too large, the fuse FUSE1 will melt and thus protect the circuit.

[0057] Continue to refer to Figure 3 or Figure 4 A discharge tube SA1 can also be installed between the live wire and the ground wire, and the live wire is connected to the ground wire through the discharge tube SA1.

[0058] The SA1 discharge tube is primarily used to protect circuits and equipment from lightning and other transient high-energy shocks. It is a switching device that conducts when the voltage across its terminals exceeds its breakdown voltage, diverting the high-voltage pulse to ground and thus protecting other components in the circuit from damage.

[0059] The discharge tube SA1 can be placed in front of the first common mode inductor. The first end of the first inductor is connected to the first end of the discharge tube SA1, and the second end of the discharge tube SA1 is connected to the ground line.

[0060] Continue to refer to Figure 3 or Figure 4 The discharge tube SA1 can be connected in series with a variable resistor RV3, which can more accurately adjust the discharge function of the discharge tube SA1.

[0061] Continue to refer to Figure 3 or Figure 4 A variable resistor RV1 can be added to the subsequent circuit of the first common-mode inductor IND1. The variable resistor RV1 can be flexibly adjusted, so that together with the inductor, X capacitor CRV2, etc., it can play a filtering role.

[0062] To optimize EMI testing results, parameters such as the common-mode inductor inductance, X capacitor capacitance, Y capacitor capacitance, and resistor value, as well as their routing, are adjusted according to the EMI electromagnetic interference test curve. The inductance of the third and fourth inductors can be set according to different interference frequency bands.

[0063] Continue to refer to Figure 3 or Figure 4 The X capacitor CRV1 can be set in the subsequent circuit of the first common mode inductor IND1 to achieve better filtering effect.

[0064] Continue to refer to Figure 3 or Figure 4 The live wire can be directly connected to the load end, such as the live wire port AC-L-PTC of a PTC.

[0065] Continue to refer to Figure 3 or Figure 4 The live wire can be connected to the load end through current-limiting resistors, such as resistors R186, R187, R188, and R189, and then connected to the AC-out port.

[0066] Based on the above embodiments, this application also provides an air conditioning device, which includes the above-mentioned filter circuit, and the filter circuit can be disposed inside the housing of the air conditioning device.

[0067] The air conditioning equipment can be an outdoor unit, and the filter circuit is connected to the outdoor unit controller. The filter circuit can be set on the circuit board inside the controller box.

[0068] Existing air conditioner outdoor units such as Figure 5 The controller 1 is installed on the windproof upright plate 2 of the outdoor unit. The connection between the controller and the LNS connection line needs to be converted by an additional terminal block, and a winding magnetic ring needs to be added to suppress electromagnetic interference.

[0069] The air conditioner outdoor unit provided in this application embodiment is as follows: Figure 6 The controller 1 is installed inside the outer casing of the outdoor unit, and the onboard terminals of the controller box are exposed. The onboard terminals are used to directly connect the power supply line, without the need for a terminal block adapter or a winding magnetic ring to suppress electromagnetic interference.

[0070] Implementing this installation method (placed on the right side panel) is particularly important for EMI debugging. The presence of the wire-wound ferrite ring can effectively suppress interference. Removing the external suspension ferrite ring requires debugging the EMI circuit. The specific debugging method should be optimized based on the circuit and test results to ensure that the test margin meets relevant standards.

[0071] The air conditioner outdoor unit provided in this application has the following advantages:

[0072] 1. The installation method has been changed. After-sales installation directly connects the power cord to the controller, eliminating the need for connection through a terminal block, thus improving assembly efficiency.

[0073] 2. With the same quality, the LNS connecting wire and winding ferrite ring are eliminated, resulting in reduced costs and improved efficiency.

[0074] The apparatus and system embodiments described above are merely illustrative. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement these embodiments without any creative effort.

[0075] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A filter circuit, comprising a first common-mode inductor, a first Y-capacitor, a second Y-capacitor, a live wire, a neutral wire, and a ground wire, wherein the first common-mode inductor comprises a first inductor and a second inductor, the first inductor being connected in series in the live wire, and the second inductor being connected in series in the neutral wire; the first Y-capacitor is connected between the live wire and the ground wire, and the second Y-capacitor is connected between the neutral wire and the ground wire; Its features are, The filter circuit further includes a third inductor and a fourth inductor, which are located on the circuit board. The third inductor is connected in series in the live wire, and the fourth inductor is connected in series in the neutral wire.

2. The filter circuit as described in claim 1, characterized in that, Both the third inductor and the fourth inductor are non-magnetic ring differential mode inductors.

3. The filter circuit as described in claim 2, characterized in that, The filter circuit also includes an X capacitor, which is connected between the live wire and the neutral wire.

4. The filter circuit as described in claim 1, characterized in that, The third inductor and the fourth inductor together form a common-mode inductor, and the inductance of both the third inductor and the fourth inductor is less than the inductance of the first common-mode inductor.

5. The filter circuit as described in claim 4, characterized in that, The preceding circuit of the first common-mode inductor does not include an X capacitor.

6. The filter circuit as described in claim 1, characterized in that, The filter circuit also includes an X capacitor; The first end of the first inductor is used to connect to the live wire, the second end of the first inductor is used to connect to the subsequent circuit, and the first end of the first inductor is connected to the first end of the X capacitor and the first end of the first Y capacitor. The first end of the second inductor is used to connect to the live wire, the second end of the second inductor is used to connect to the subsequent circuit, and the first end of the second inductor is connected to the second end of the X capacitor and the first end of the second Y capacitor; The second terminal of the first Y capacitor and the second terminal of the second Y capacitor are connected to the ground line.

7. The filter circuit as described in claim 6, characterized in that, The first end of the third inductor is used to connect to the live wire, and the second end of the third inductor is connected to the first end of the first inductor; The first end of the fourth inductor is used to connect to the neutral wire, and the second end of the fourth inductor is connected to the first end of the second inductor; The filter circuit also includes a discharge tube, with the first end of the first inductor connected to the first end of the discharge tube and the second end of the discharge tube connected to the ground line.

8. The filter circuit as described in claim 1, characterized in that, The filtering circuit is connected to the controller, and the filtering circuit is located on a circuit board inside the controller housing.

9. The filter circuit as described in claim 8, characterized in that, The controller housing is located inside the outer casing of the outdoor unit of the air conditioner, and the onboard terminals of the controller housing are exposed outside the outdoor unit of the air conditioner. The onboard terminals are used to directly connect to the power supply cable.

10. An air conditioning device, characterized in that, The air conditioning equipment includes a controller and a filter circuit according to any one of claims 1 to 9.

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