CN218387269U - Filter circuit and air conditioner outdoor unit - Google Patents
Filter circuit and air conditioner outdoor unit Download PDFInfo
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- CN218387269U CN218387269U CN202222718868.8U CN202222718868U CN218387269U CN 218387269 U CN218387269 U CN 218387269U CN 202222718868 U CN202222718868 U CN 202222718868U CN 218387269 U CN218387269 U CN 218387269U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The application provides a filter circuit, filter circuit includes: the input phase line, the common mode filter unit and the relay are connected; the input phase lines comprise a first input phase line, a second input phase line and a third input phase line; one end of the common mode filter unit is connected with the input phase line; the first end of the relay is connected with the common mode filtering unit, the second end of the relay is grounded, the relay is in a closed state when the first end and the second end of the relay are connected, and the relay is in an open state when the first end and the second end of the relay are mutually disconnected. The filter circuit can effectively reduce leakage current and improve circuit safety.
Description
Technical Field
The application belongs to the technical field of circuits, and particularly relates to a filter circuit and an air conditioner external unit.
Background
In the prior art, in order to meet the requirement of electromagnetic compatibility, an air conditioner driver has an EMI filter circuit on a power input side, and in the existing filter circuit, the capacitance value of a Y capacitor is high due to the configuration problem of the Y capacitor in the circuit, so that a large leakage current is generated, and the potential safety hazard of electric shock of a human body is caused.
SUMMERY OF THE UTILITY MODEL
An object of this application is to provide a filter circuit and outer machine of air conditioner for solve filter circuit's electric leakage among the prior art and flow through big problem.
To achieve the above and other related objects, in a first aspect, the present application provides a filter circuit, including: the input phase line, the common mode filter unit and the relay are connected; the input phase lines comprise a first input phase line, a second input phase line and a third input phase line; one end of the common mode filter unit is connected with the input phase line; the first end of the relay is connected with the common mode filtering unit, the second end of the relay is grounded, the relay is in a closed state when the first end and the second end of the relay are connected, and the relay is in an open state when the first end and the second end of the relay are mutually disconnected.
In the application, each common mode filter unit is additionally provided with one relay to control the switching-in and switching-out of the common mode filter unit in a circuit, so that the size of leakage current of the filter circuit can be effectively controlled, and the safety of the filter circuit is improved.
In an implementation manner of the first aspect, there are three common-mode filtering units, and any one of the common-mode filtering units is connected to the first end of one of the relays.
Further, any one of the common mode filter units includes: the first common mode capacitor, the second common mode capacitor and the third common mode capacitor. Specifically, one end of the first common-mode capacitor is connected with the first input phase line, one end of the second common-mode capacitor is connected with the second input phase line, one end of the third common-mode capacitor is connected with the third input phase line, and the other end of the first common-mode capacitor, the other end of the second common-mode capacitor and the other end of the third common-mode capacitor are connected with the first end of the relay.
In this implementation manner, the relay is connected to the first end of the relay to control the switching-in and switching-out of the common mode filter unit in the circuit, and the common mode filter unit is used to suppress noise in the filter circuit, so as to restore the integrity of the signal to the maximum extent.
In an implementation form of the first aspect, the filter circuit further includes a differential mode filtering unit, and the differential mode filtering unit includes: a first differential mode capacitance, a second differential mode capacitance, and a third differential mode capacitance. Specifically, one end of the first differential mode capacitor is connected to the first input phase line, one end of the second differential mode capacitor is connected to the second input phase line, one end of the third differential mode capacitor is connected to the third input phase line, and the other end of the first differential mode capacitor and the other end of the second differential mode capacitor are connected to the other end of the third differential mode capacitor together.
In this implementation, the differential mode interference in the filter circuit can be attenuated by the differential mode filtering unit.
In an implementation manner of the first aspect, the filter circuit further includes a protection unit, and the protection unit includes: the first voltage dependent resistor, the second voltage dependent resistor, the third voltage dependent resistor and the discharge tube. Specifically, one end of the first voltage dependent resistor is connected to the first input phase line, one end of the second voltage dependent resistor is connected to the second input phase line, one end of the third voltage dependent resistor is connected to the third input phase line, the other end of the first voltage dependent resistor, the other end of the second voltage dependent resistor and the other end of the third voltage dependent resistor are connected to one end of the discharge tube, and the other end of the discharge tube is grounded.
In this implementation manner, the piezoresistors are connected in series with one discharge tube, and the discharge tube separates the piezoresistors from the filter circuit when the filter circuit works normally, so that almost no leakage current flows through the piezoresistors, thereby reducing the voltage flowing through the piezoresistors and effectively slowing down the aging phenomenon of the piezoresistors caused by the leakage current flowing for a long time.
In one implementation form of the first aspect, the filter circuit further includes a fourth voltage dependent resistor, a fifth voltage dependent resistor, and a sixth voltage dependent resistor. Specifically, fourth piezo-resistor's one end with first input phase line is connected, the other end with the second input phase line is connected, fifth piezo-resistor's one end with first input phase line is connected, the other end with the third input phase line is connected, sixth piezo-resistor's one end with the second input phase line is connected, the other end with the third input phase line is connected.
In one implementation form of the first aspect, the filter circuit further includes a first common-mode inductor and a second common-mode inductor. Specifically, a first end of the first common-mode inductor is connected to the first input phase line, a second end of the first common-mode inductor is connected to the second input phase line, and a third end of the first common-mode inductor is connected to the third input phase line; the first end of the second common mode inductor is connected with the fourth end of the first common mode inductor, the second end of the second common mode inductor is connected with the fifth end of the first common mode inductor, the third end of the second common mode inductor is connected with the sixth end of the first common mode inductor, the fourth end of the second common mode inductor is connected with the first input phase line, the fifth end of the second common mode inductor is connected with the second input phase line, and the sixth end of the second common mode inductor is connected with the third input phase line.
In this implementation manner, the common-mode inductor can effectively suppress the common-mode interference signal in the filter circuit.
In a second aspect, the present application provides an outdoor unit of an air conditioner, including the filter circuit of any one of the first aspects of the present application.
As above, this application filter circuit and outer machine of air conditioner have following beneficial effect:
first, the filter circuit includes: the input phase line, the common mode filter unit and the relay are connected; the input phase lines comprise a first input phase line, a second input phase line and a third input phase line; one end of the common mode filter unit is connected with the input phase line; the first end of the relay is connected with the common mode filtering unit, the second end of the relay is grounded, the relay is in a closed state when the first end and the second end of the relay are connected, and the relay is in an open state when the first end and the second end of the relay are mutually disconnected. In this application, when the relay is in the open state, the common mode filter unit is switched out from the filter circuit, that is, the filter circuit does not generate a leakage current, and when the relay is in the closed state, the common mode filter unit is switched in the filter circuit and then grounds the leakage current generated by the filter circuit. Therefore, the filter circuit can control the size of the leakage current in the filter circuit so as to prevent the generated leakage current from exceeding the standard limit value, and the safety of the filter circuit is greatly improved.
And secondly, the filter circuit comprises three groups of common-mode filter units corresponding to three relays, so that the three relays can be combined in eight switch states, and can correspond to proper relay switch states according to the working state of the air conditioner outdoor unit, so that the working state of the filter circuit is matched with the air conditioner outdoor unit, and a better filter effect is realized.
Drawings
Fig. 1 is a circuit diagram of a filter circuit according to an embodiment of the present disclosure.
Fig. 2 shows a schematic circuit diagram of a relay according to an embodiment of the present application.
Fig. 3 is a schematic circuit diagram of a filter circuit including a differential mode filter unit according to an embodiment of the disclosure.
Fig. 4 is a circuit diagram of a filter circuit including a protection unit according to an embodiment of the present disclosure.
Fig. 5 is a circuit diagram of a filter circuit according to an embodiment of the present application.
Description of the element reference
100. Filter circuit
10. Input phase line
11. First input phase line
12. Second input phase line
13. Third input phase line
14. Ground wire
2a first common-mode filter unit
2b second common mode filter unit
2c third common mode filter unit
21. First common mode capacitor
22. Second common mode capacitor
23. Third common mode capacitor
24. First common mode capacitor
25. Second common mode capacitor
26. Third common mode capacitor
27. First common mode capacitor
28. Second common mode capacitor
29. Third common mode capacitor
31. First relay
32. Second relay
33. Third relay
301. First end of relay
302. Second end of relay
303. Third terminal of relay
304. Fourth terminal of relay
41. First input signal
42. Second input signal
43. Third input signal
51. First safety element
52. Second fuse element
53. Third fuse element
61. First common mode inductor
62. Second common mode inductor
70. Differential mode filtering unit
71. First differential mode capacitor
72. Second differential mode capacitor
73. Third differential mode capacitor
80. Protection unit
81. A first voltage dependent resistor
82. Second piezoresistor
83. Third piezoresistor
84. Fourth voltage dependent resistor
85. Fifth voltage dependent resistor
86. Sixth varistor
87. Discharge tube
Detailed Description
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The application is capable of other and different embodiments and its several details are capable of modifications and various changes in detail without departing from the spirit of the application. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application and are not drawn according to the number, shape and size of the components in actual implementation, the type, quantity and proportion of each component in actual implementation may be changed freely, and the layout of the components may be more complicated.
To the problem that the excessive potential safety hazard that brings of leakage current among the filter circuit among the prior art, this application provides a filter circuit, includes: inputting a phase line; the input phase lines comprise a first input phase line, a second input phase line and a third input phase line; a common mode filtering unit; one end of the common mode filter unit is connected with the input phase line; a relay; the first end and the common mode filter unit of relay are connected, and the second end ground connection, and the relay is in the on-state when the first end of relay and second end are connected, and the relay is in the off-state when the first end of relay and second end break off each other. According to the method and the device, the relay is added into the filter circuit to control the switching-in and switching-out of the common mode filter unit in the filter circuit, so that the current value of the leakage current in the circuit can be well controlled. Therefore, the filter circuit can effectively control the size of leakage current, solves the problem of potential safety hazard caused by excessive leakage current in the filter circuit in the prior art, and can improve safety.
The principle and implementation of the filter circuit and the air conditioner external unit according to the present embodiment will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the filter circuit and the air conditioner external unit according to the present embodiment without creative work.
The present embodiment provides a filter circuit, including: input phase line, common mode filter unit, relay. The input phase lines comprise a first input phase line, a second input phase line and a third input phase line; one end of the common mode filter unit is connected with the input phase line; the first end of the relay is connected with the common-mode filtering unit, and the second end of the relay is grounded; the relay is in the closed state when first end and the second end of relay are connected, and the relay is in the disconnection state when first end and the second end of relay break off each other.
Referring to fig. 1, a filter circuit 100 of the present application includes: input phase lines 10, wherein the input phase lines 10 include a first input phase line 11, a second input phase line 12, and a third input phase line 13; the 3 common-mode filtering units are respectively a first filtering unit 2a, a second filtering unit 2b and a third filtering unit 2c; and 3 relays are a first relay 31, a second relay 32, and a third relay 33, respectively; and a ground line 14.
The first filter unit 2a is connected to the first relay 31 and the input phase line 10, wherein the first filter unit 2a includes a first common-mode capacitor 21, a second common-mode capacitor 22, and a third common-mode capacitor 23. Specifically, one end of the first common-mode capacitor 21 is connected to the first input phase line 11, one end of the second common-mode capacitor 22 is connected to the second input phase line 12, one end of the third common-mode capacitor 23 is connected to the third input phase line 13, the other end of the first common-mode capacitor 21, the other end of the second common-mode capacitor 22, and the other end of the third common-mode capacitor 23 are connected to the first end of the first relay 31, and the second end of the first relay 31 is connected to the ground line 14.
It is understood that the third filter unit 2c is connected to the third relay 33 and the input phase line 10 in the same manner as described above, and therefore not described in detail herein.
Specifically, referring to fig. 1 and fig. 2, fig. 2 is a schematic circuit diagram of the relay in the present embodiment. In fig. 2, taking the first relay 31 as an example, the first relay 31 includes a first end 301, a second end 302, a third end 303 and a fourth end 304, wherein the first end 301 of the first relay 31 is connected to the first filter unit 2a, the second end 302 of the first relay 31 is connected to the ground 14, so that when the first end 301 and the second end 302 of the first relay 31 are in a closed state, the first filter unit 2a is grounded, the third end 303 of the first relay 31 is connected to a first voltage source, and the fourth end 304 of the first relay 31 is connected to the first input signal 41. The first input signal 41 is used to put the first terminal 301 and the second terminal 302 of the first relay 31 in a closed state or an open state.
Similarly, the first end 301 of the second relay 32 is connected to the second filter unit 2b, the second end 302 of the second relay 32 is connected to the ground 14, so that when the first end 301 and the second end 302 of the second relay 32 are in a closed state, the first filter unit 2b is grounded, the third end 303 of the second relay 32 is connected to the second voltage source, and the fourth end 304 of the second relay 32 is connected to the second input signal 42. The second input signal 42 is used to put the first terminal 301 and the second terminal 302 of the second relay 32 in a closed state or an open state.
The first terminal 301 of the third relay 33 is connected to the third filter unit 2c, the second terminal 302 of the third relay 33 is connected to the ground 14, so that when the first terminal 301 and the second terminal 302 of the third relay 33 are in a closed state, the third filter unit 2c is grounded, the third terminal 303 of the third relay 33 is connected to the third voltage source, and the fourth terminal 304 of the third relay 33 is connected to the third input signal 43. The third input signal 43 is used to put the first terminal 301 and the second terminal 302 of the third relay 33 in a closed state or an open state.
Specifically, referring to fig. 1, the filter circuit 100 further includes: the first common-mode inductor 61 and the second common-mode inductor 62, and the first common-mode inductor 61 and the second common-mode inductor 62 can effectively suppress the common-mode interference signal in the filter circuit 100. Specifically, a first end of the first common mode inductor 61 is connected to the first input phase line 11, a second end of the first common mode inductor 61 is connected to the second input phase line 12, and a third end of the first common mode inductor 61 is connected to the third input phase line 13; the first end of the second common-mode inductor 62 is connected with the fourth end of the first common-mode inductor 61, the second end of the second common-mode inductor 62 is connected with the fifth end of the first common-mode inductor 61, the third end of the second common-mode inductor 62 is connected with the sixth end of the first common-mode inductor 61, the fourth end of the second common-mode inductor 62 is connected with the first input phase line 11, the fifth end of the second common-mode inductor 62 is connected with the second input phase line 12, and the sixth end of the second common-mode inductor 62 is connected with the third input phase line 13.
Optionally, referring to fig. 3, fig. 3 is a schematic circuit diagram of the differential mode filtering unit in the filtering circuit of the present embodiment. The filter circuit 100 further comprises a differential mode filtering unit 70, the differential mode filtering unit 70 being configured to attenuate differential mode interference in the filter circuit 100.
Specifically, the differential-mode filtering unit 70 includes: a first differential mode capacitance 71, a second differential mode capacitance 72 and a third differential mode capacitance 73; one end of the first differential-mode capacitor 71 is connected to the first input phase line 11; one end of the second differential mode 72 capacitor is connected to the second input phase line 12; one end of the third differential-mode capacitor 73 is connected to the third input phase line 13; the other end of the first differential-mode capacitor 71 and the other end of the second differential-mode capacitor 72 are connected to the other end of the third differential-mode capacitor 73.
Optionally, referring to fig. 4, the filter circuit 100 of the present embodiment further includes a protection unit 80, and the protection unit 80 is configured to perform overvoltage protection on the filter circuit 100. Specifically, the protection unit 80 includes: a first varistor 81, a second varistor 82, a third varistor 83, and a discharge tube 87; one end of the first varistor 81 is connected to the first input phase line 11; one end of the second varistor 82 is connected to the second input phase 12; one end of the third varistor 83 is connected to the third input phase 13; the other end of the first varistor 81, the other end of the second varistor 82, and the other end of the third varistor 83 are commonly connected to one end of a discharge tube 87, the other end of which is grounded to the ground 14.
It should be noted that, a plurality of voltage dependent resistors are connected in series with a discharge tube, and the discharge tube separates the voltage dependent resistors from the filter circuit when the filter circuit is in normal operation, so that almost no leakage current flows through the voltage dependent resistors, thereby reducing the voltage flowing through the voltage dependent resistors and effectively slowing down the aging phenomenon of the voltage dependent resistors caused by the leakage current flowing for a long time.
Optionally, referring to fig. 5, the filter circuit 100 further includes: a fourth varistor 84, a fifth varistor 85, and a sixth varistor 86; one end of the fourth varistor 84 is connected to the first input phase line 11, and the other end is connected to the second input phase line 12; one end of the fifth varistor 85 is connected to the first input phase 11, and the other end is connected to the third input phase 13; one end of the sixth varistor 86 is connected to the second input phase line 12 and the other end is connected to the third input phase line 13.
In an embodiment, the outdoor unit of an air conditioner includes the filter circuit 100 shown in fig. 1. In specific application, the filter circuit 100 is arranged in an air conditioner external unit to reduce leakage current generated by an air conditioner external unit system.
Specifically, in practical applications, the operating state of the filter circuit is closely related to the operating state of the compressor of the outdoor unit of the air conditioner. In order to match the working state of the filter circuit 100 with the working state of the compressor, the compressor can be divided into 4 working states according to the working frequency, the filter circuit comprises three relays, different switching states of the three relays can be divided into 8 combinations, the three relays are controlled to be in a closed state or an end state according to the working frequency of the compressor through input signals, the working state of the compressor is matched, and the optimal filter effect can be achieved.
The description of the flow or structure corresponding to each of the above drawings has emphasis, and a part not described in detail in a certain flow or structure may refer to the related description of other flows or structures.
In summary, in the first aspect, the relay is added to the filter circuit to control the common mode filter unit to switch in or switch out the filter circuit, when the relay is in the off state, the common mode filter unit is switched out from the filter circuit, that is, the filter circuit does not generate a leakage current, when the relay is in the on state, the common mode filter unit is switched in the filter circuit, and then the leakage current generated by the filter circuit is grounded. In a second aspect, the filter circuit of the present application includes three common mode filter units corresponding to three relays, and the three relays may have eight switch states combined, and may correspond to a proper relay switch state according to the operating state of the air conditioner external unit, so that the operating state of the filter circuit matches with the air conditioner external unit, thereby achieving the best filtering effect. Therefore, the application effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present disclosure be covered by the claims of the present application.
Claims (10)
1. A filter circuit, the filter circuit comprising:
inputting a phase line; the input phase lines comprise a first input phase line, a second input phase line and a third input phase line;
a common mode filtering unit; one end of the common mode filter unit is connected with the input phase line;
a relay; the first end of the relay is connected with the common mode filtering unit, the second end of the relay is grounded, the relay is in a closed state when the first end and the second end of the relay are connected, and the relay is in an open state when the first end and the second end of the relay are mutually disconnected.
2. The filter circuit of claim 1, wherein: three common-mode filtering units are provided;
any common mode filtering unit is respectively connected with the first end of one relay.
3. The filter circuit of claim 2, wherein: any one of the common mode filtering units comprises: the first common-mode capacitor, the second common-mode capacitor and the third common-mode capacitor;
one end of the first common-mode capacitor is connected with the first input phase line;
one end of the second common-mode capacitor is connected with the second input phase line;
one end of the third common-mode capacitor is connected with the third input phase line;
the other end of the first common-mode capacitor, the other end of the second common-mode capacitor and the other end of the third common-mode capacitor are connected with a first end of a relay together.
4. The filter circuit of claim 1, wherein: the filter circuit further comprises a differential mode filter unit; the differential mode filtering unit is used for attenuating differential mode interference.
5. The filter circuit of claim 4, wherein: the differential mode filtering unit includes: a first differential mode capacitor, a second differential mode capacitor and a third differential mode capacitor;
one end of the first differential mode capacitor is connected with the first input phase line;
one end of the second differential mode capacitor is connected with the second input phase line;
one end of the third differential mode capacitor is connected with the third input phase line;
the other end of the first differential mode capacitor and the other end of the second differential mode capacitor are connected with the other end of the third differential mode capacitor.
6. The filter circuit of claim 1, wherein: the filter circuit further comprises a protection unit; the protection unit is used for performing overvoltage protection on the filter circuit.
7. The filter circuit of claim 6, wherein: the protection unit includes: the first piezoresistor, the second piezoresistor, the third piezoresistor and the discharge tube;
one end of the first piezoresistor is connected with the first input phase line;
one end of the second piezoresistor is connected with the second input phase line;
one end of the third piezoresistor is connected with the third input phase line;
the other end of the first piezoresistor, the other end of the second piezoresistor and the other end of the third piezoresistor are connected to one end of the discharge tube together, and the other end of the discharge tube is grounded.
8. The filter circuit of claim 1, further comprising a fourth, fifth, and sixth piezo-resistor;
one end of the fourth piezoresistor is connected with the first input phase line, and the other end of the fourth piezoresistor is connected with the second input phase line;
one end of the fifth piezoresistor is connected with the first input phase line, and the other end of the fifth piezoresistor is connected with the third input phase line;
one end of the sixth piezoresistor is connected with the second input phase line, and the other end of the sixth piezoresistor is connected with the third input phase line.
9. The filter circuit of claim 1, further comprising: a first common mode inductor and a second common mode inductor;
a first end of the first common-mode inductor is connected with the first input phase line, a second end of the first common-mode inductor is connected with the second input phase line, and a third end of the first common-mode inductor is connected with the third input phase line;
the first end of the second common mode inductor is connected with the fourth end of the first common mode inductor, the second end of the second common mode inductor is connected with the fifth end of the first common mode inductor, the third end of the second common mode inductor is connected with the sixth end of the first common mode inductor, the fourth end of the second common mode inductor is connected with the first input phase line, the fifth end of the second common mode inductor is connected with the second input phase line, and the sixth end of the second common mode inductor is connected with the third input phase line.
10. An outdoor unit for an air conditioner, comprising the filter circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222718868.8U CN218387269U (en) | 2022-10-14 | 2022-10-14 | Filter circuit and air conditioner outdoor unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222718868.8U CN218387269U (en) | 2022-10-14 | 2022-10-14 | Filter circuit and air conditioner outdoor unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218387269U true CN218387269U (en) | 2023-01-24 |
Family
ID=84929971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222718868.8U Active CN218387269U (en) | 2022-10-14 | 2022-10-14 | Filter circuit and air conditioner outdoor unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218387269U (en) |
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2022
- 2022-10-14 CN CN202222718868.8U patent/CN218387269U/en active Active
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