CN109873553A - The common-mode interference suppression circuit of air-conditioning - Google Patents
The common-mode interference suppression circuit of air-conditioning Download PDFInfo
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- CN109873553A CN109873553A CN201910248118.9A CN201910248118A CN109873553A CN 109873553 A CN109873553 A CN 109873553A CN 201910248118 A CN201910248118 A CN 201910248118A CN 109873553 A CN109873553 A CN 109873553A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 159
- 230000001629 suppression Effects 0.000 title claims abstract description 36
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- 230000005611 electricity Effects 0.000 claims description 7
- 230000003071 parasitic effect Effects 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 8
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- 101100208473 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) lcm-2 gene Proteins 0.000 description 5
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- 230000006641 stabilisation Effects 0.000 description 5
- 238000011105 stabilization Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
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- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 230000024241 parasitism Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The present invention provides a kind of common-mode interference suppression circuit of air-conditioning, comprising: the power end of air-conditioning internal machine, the air-conditioning internal machine connects electric network source, the ground wire that the ground terminal of the air-conditioning internal machine passes through the first ground line connection power grid by first group of power supply line；Outdoor machine of air-conditioner, the power end of the outdoor machine of air-conditioner connect the power end of the air-conditioning internal machine by second group of power supply line, and the ground terminal of the outdoor machine of air-conditioner connects the ground terminal of the air-conditioning internal machine by the second ground line；Wherein, the power end of the air-conditioning internal machine is provided with the first common-mode filter, to filter out common mode interference that the work of outdoor machine of air-conditioner frequency conversion system generates and by the parasitic parameter resonance aggravation on second group of power supply line and second ground line.Equivalent position tandem electric inductance of the present invention in air-conditioning internal machine, shunt capacitance inhibit common mode current to flow into power grid with this, to increase the decaying of EMI, inhibit EMI interference；It can realize that outdoor machine of air-conditioner electric-controlled plate minimizes simultaneously, reduce cost.
Description
Technical field
The present invention relates to common mode interferences to inhibit field, more particularly to a kind of common-mode interference suppression circuit of air-conditioning.
Background technique
Voltage change (du/dt) caused by device for power switching switch motion in air-conditioning frequency conversion system and circuit are over the ground
Interaction between parasitic parameter generates common mode current, forms common mode interference, common mode interference enters power grid can be to its in power grid
Its device has an impact.
Air-conditioning frequency conversion system is located at outdoor machine of air-conditioner, usually in the power input of outdoor machine of air-conditioner and the input terminal of compressor
Common-mode filter is set to inhibit common mode current to flow into power grid, still, still has least a portion of common mode current to flow into power grid.
Therefore, how to further increase common mode inhibition effect, reduce common mode current inflow power grid, it has also become art technology
One of personnel's urgent problem to be solved.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of inhibition of the common mode interference of air-conditioning
Circuit, the common mode inhibition for solving the problems, such as air-conditioning in the prior art are ineffective.
In order to achieve the above objects and other related objects, the present invention provides a kind of common-mode interference suppression circuit of air-conditioning, institute
The common-mode interference suppression circuit for stating air-conditioning includes at least:
Air-conditioning internal machine, the power end of the air-conditioning internal machine connect electric network source by first group of power supply line, in the air-conditioning
The ground wire that the ground terminal of machine passes through the first ground line connection power grid；
Outdoor machine of air-conditioner, the power end of the outdoor machine of air-conditioner connect the power supply of the air-conditioning internal machine by second group of power supply line
End, the ground terminal of the outdoor machine of air-conditioner connect the ground terminal of the air-conditioning internal machine by the second ground line；
Wherein, the power end of the air-conditioning internal machine is provided with the first common-mode filter.
Optionally, first common-mode filter includes the first common mode inductance being series on first group of power supply line.
More optionally, the air-conditioning internal machine includes air-conditioning internal machine electric controller, and the air-conditioning internal machine electric controller connects the sky
The power end of machine in adjusting.
Optionally, first common-mode filter includes the second common mode inductance being series on second group of power supply line.
More optionally, the air-conditioning internal machine includes the second common-mode filter and air-conditioning internal machine electric controller, and described second is total
Mode filter is set between the power end of the air-conditioning internal machine and air-conditioning internal machine electric controller.
More optionally, first common-mode filter further includes capacitance group, and each capacitor is respectively arranged in the capacitance group
Between the power end of the air-conditioning internal machine and the ground terminal of the air-conditioning internal machine.
More optionally, the ground terminal of the air-conditioning internal machine is provided with the first inductance, and first inductance is series at described
On one ground line.
More optionally, the ground terminal of the air-conditioning internal machine is provided with the first inductance, and first inductance is series at described
On one ground line.
Optionally, the outdoor machine of air-conditioner includes third common-mode filter, outdoor machine of air-conditioner electric controller and motor, and the third is total
Mode filter is set between the power end of the outdoor machine of air-conditioner and outdoor machine of air-conditioner electric controller, and the motor connects outside the air-conditioning
The output end of Electrical Control device.
More optionally, the outdoor machine of air-conditioner electric controller includes:
Power inverter, for input AC electricity to be converted to DC bus-bar voltage；
Inverter is connected to the output end of the power inverter, for converting output for the DC bus-bar voltage
Alternating current.
As described above, the common-mode interference suppression circuit of air-conditioning of the invention, has the advantages that
The common-mode interference suppression circuit of air-conditioning of the invention air-conditioning internal machine equivalent position tandem electric inductance, shunt capacitance,
It is reduced with this because the common mode current of long conducting wire ghost effect aggravation flows into power grid, to increase the decaying of EMI, inhibits EMI, improve
The performance of EMI conduction.
The common-mode interference suppression circuit of air-conditioning of the invention can not only inhibit because of long conducting wire ghost effect i.e. LC resonance net
High frequency (MHz) common mode interference that network generates, the low frequency (150kHz-MHz) and high frequency that air-conditioning internal machine can also be inhibited to generate
(MHz) common mode interference, can improve the common mode interference of full frequency band, therefore can reduce the common-mode filter of outdoor machine of air-conditioner, make
The outer Electrical Control plate miniaturization of air-conditioning is obtained, to reduce costs.
The common-mode interference suppression circuit of air-conditioning of the invention can substantially inhibit EMI, so that leave the EMI of outdoor machine of air-conditioner for
Surplus is larger, to simplify the common-mode filter design of outdoor machine of air-conditioner electric-controlled plate, is conducive to quickly developing and set for product
The consistency of meter.
Detailed description of the invention
Fig. 1 is shown as the first structural schematic diagram of the common-mode interference suppression circuit of air-conditioning of the invention.
Fig. 2 is shown as the concrete structure schematic diagram of outdoor machine of air-conditioner of the invention.
Fig. 3 is shown as second of structural schematic diagram of the common-mode interference suppression circuit of air-conditioning of the invention.
Fig. 4 is shown as the third structural schematic diagram of the common-mode interference suppression circuit of air-conditioning of the invention.
Fig. 5 is shown as the 4th kind of structural schematic diagram of the common-mode interference suppression circuit of air-conditioning of the invention.
Fig. 6 is shown as the 5th kind of structural schematic diagram of the common-mode interference suppression circuit of air-conditioning of the invention.
Fig. 7 is shown as the 6th kind of structural schematic diagram of the common-mode interference suppression circuit of air-conditioning of the invention.
Component label instructions
The common-mode interference suppression circuit of 1 air-conditioning
11 air-conditioning internal machines
111 second common-mode filters
112 air-conditioning internal machine electric controllers
12 outdoor machine of air-conditioner
121 third common-mode filters
122 outdoor machine of air-conditioner electric controllers
1221 power inverters
1222 inverters
1223 the 4th common-mode filters
123 motors
13 first common-mode filters
14 line impedance stabilization net works
15 long lead systems
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to FIG. 1 to FIG. 7.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
Due between air-conditioning internal machine and outer machine power supply line and ground wire it is too long, parasitic parameter on cable (parasitic capacitance and
Parasitic inductance) resonance can be caused, so that flowing into the common mode current aggravation of power grid, on a small quantity so as to cause the degradation of EMI conduction.
The present invention is directed between air-conditioning internal machine and outer machine resonance caused by parasitic parameter on long cable, proposes a kind of being total to for air-conditioning
Mould codan inhibits EMI to increase the decaying of EMI.
Embodiment one
As shown in Figure 1, the present embodiment provides a kind of common-mode interference suppression circuit 1 of air-conditioning, the common mode interference of the air-conditioning
Suppression circuit 1 includes:
Air-conditioning internal machine 11, outdoor machine of air-conditioner 12, the first common-mode filter 13 and route impedance stable network 14.
As shown in Figure 1, the power end of the air-conditioning internal machine 11 connects electric network source, the air-conditioning by first group of power supply line
The ground wire PE that the ground terminal of interior machine 11 passes through the first ground line connection power grid.
Specifically, in the present embodiment, the air-conditioning internal machine 11 passes through first group of power supply line (two power supply lines) connection electricity
The zero curve N and firewire L (single phase alternating current power supply) of network source are that the air-conditioning internal machine 11 mentions based on the zero curve N and firewire L
For AC power source, for the zero curve N and the firewire L are merged into single line convenient for display in Fig. 1, in actual use, this
The technical staff in field is known, zero curve N and firewire L both threads, and connect with the power end of the air-conditioning internal machine 11, herein not
It repeats one by one.The ground terminal of the air-conditioning internal machine 11 is connect by the first ground line with the ground wire PE of power grid.The air-conditioning internal machine
11 can realize connection by plug and socket with the zero curve N, the firewire L and the ground wire PE.
As shown in Figure 1, the power end of the outdoor machine of air-conditioner 12 connects the air-conditioning internal machine 11 by second group of power supply line
Power end, the ground terminal of the outdoor machine of air-conditioner 12 connect the ground terminal of the air-conditioning internal machine 11 by the second ground line.
Specifically, by long cable, (outdoor is connected to room to the power end of the outdoor machine of air-conditioner 12 and the air-conditioning internal machine 11
It is interior) connection, it powers as the outdoor machine of air-conditioner 12.Similarly, the ground connection of the outdoor machine of air-conditioner 12 and the air-conditioning internal machine 11
End is connected by long cable (outdoor is connected to interior).It should be noted that second ground line includes but is not limited to cable
Line, further include the copper pipe being connected between the ground terminal of the air-conditioning internal machine 11 and the ground terminal of the outdoor machine of air-conditioner 12 or other
Conductor.
Specifically, the outdoor machine of air-conditioner 12 includes third common-mode filter 121, outdoor machine of air-conditioner electric controller 122 and motor
123；One end of the third common-mode filter 121 connects the power end of the outdoor machine of air-conditioner 12, and the other end connects the air-conditioning
Outer Electrical Control device 122, the motor 123 connect the output end of the outdoor machine of air-conditioner electric controller 122.
More specifically, the alternating current that the connection of third common-mode filter 121 is inputted by the air-conditioning internal machine 11, described
Third common-mode filter 121 is single-stage or multistage, can be set according to the requirement to common mode interference inhibitory effect.The third
Inductance in common-mode filter 121 includes but is not limited to FERRITE CORE, and amorphous magnetic core can be set as needed.It is described
The structure of any achievable common mode filtering can be used in third common-mode filter 121, will not repeat them here.
More specifically, as shown in Fig. 2, the outdoor machine of air-conditioner electric controller 122 includes power inverter 1221, inverter
1222.The power inverter 1221 is used to input AC electricity being converted to DC bus-bar voltage.The inverter 1222 connects
In the output end of the power inverter 1221, for converting output alternating current for the DC bus-bar voltage.
Wherein, the power inverter 1221 includes rectification unit and PFC (Power Factor Correction, power
Factor corrector) unit, such as boost PFC, voltage-dropping type PFC or buck-boost type PFC, different power can be set as needed
Transformer configuration is not enumerated with the present embodiment and is limited.As shown in Fig. 2, in the present embodiment, the power inverter 1221 includes
Rectification unit and boost PFC unit, specifically, the power inverter 1221 include rectification unit, the second inductance L2, first
Power switch tube Q1, first diode D1 and output capacitance Co.The input terminal of the rectification unit is separately connected AC power source
Firewire L signal and zero curve n-signal, the rectification unit include that four diodes and a filter capacitor Cf, four diodes are constituted
Rectifier bridge structure, the filter capacitor Cf are connected between the output end of rectifier bridge.One end of the second inductance L2 connects institute
The anode of rectification unit output end is stated, the other end connects the collector of the first power switch tube Q1.First power is opened
The emitter for closing pipe Q1 connects the cathode of the rectification unit output end, and gate pole connects first control signal, first control
Signal controls the turn-on and turn-off of the first power switch tube Q1, and then controls the direct current that the power inverter 1221 exports
The size of busbar voltage, in the present embodiment, the first power switch tube Q1 are insulated gate bipolar transistor；Actually make
The type of the first power switch tube Q1, including but not limited to Metal-Oxide Semiconductor field can be set as needed in
Effect transistor, at this point, the drain electrode of the first power switch tube Q1 connects the second inductance L2, source electrode connects the rectification
The cathode of unit output end, grid connect the first control signal.The anode connection described first of the first diode D1
The cathode of the collector of power switch tube Q1, the first diode D1 passes through the output capacitance Co connection rectification unit
The cathode of output end.Positive DC-BUS+ of the top crown of the output capacitance Co as the DC bus-bar voltage, the output
Cathode DC-BUS- of the bottom crown of capacitor Co as the DC bus-bar voltage.The first diode D1 is described for preventing
Output capacitance Co is discharged to the cathode DC-BUS- of the DC bus-bar voltage.
It should be noted that in the present embodiment, the output capacitance Co is a capacitor, in actual use, described
Output capacitance Co can be the series and parallel or series-parallel of multiple capacitors, be not limited to this embodiment.
Wherein, the structure of the inverter 1222 can select any one structure as needed, be not limited to this embodiment.
As shown in Fig. 2, in the present embodiment, the inverter 1222 includes six power switch tubes, three phase inverter bridge is constituted, wherein
Second power switch tube Q21 and third power switch tube Q22 is series at the positive DC-BUS+ of the DC bus-bar voltage and described
(collector of the second power switch tube Q21 connects the DC bus electricity between the cathode DC-BUS- of DC bus-bar voltage
Positive DC-BUS+, the emitter of pressure connect the collector of the third power switch tube Q22, the third power switch tube Q22
Emitter connect the cathode DC-BUS- of the DC bus-bar voltage)；4th power switch tube Q23 and the 5th power switch tube
Q24 is series between the positive DC-BUS+ of the DC bus-bar voltage and the cathode DC-BUS- of the DC bus-bar voltage (even
It is identical as the second power switch tube Q21 and the third power switch tube Q22 to connect port, will not repeat them here)；6th
Power switch tube Q25 and the 7th power switch tube Q26 is series at the positive DC-BUS+ and the direct current of the DC bus-bar voltage
(connectivity port and the second power switch tube Q21 and the third power switch tube between the cathode DC-BUS- of busbar voltage
Q22 is identical, will not repeat them here)；Each power switch tube is separately connected a control signal in the inverter 1222.In this reality
It applies in example, each power switch tube is insulated gate bipolar transistor in the inverter 1222, in actual use can be according to need
Set the type of each power switch tube.
More specifically, the motor 123 is connected to the output end of the outdoor machine of air-conditioner electric controller 122, by the air-conditioning outside
The output exchange electric drive operating of Electrical Control device 122.In the present embodiment, the motor 123 is three-phase motor, when the three of motor
After phase stator winding (respectively 120 degree of electrical angles of difference) is passed through output alternating current, a rotating excitation field will be generated, which cuts
Rotor windings are cut, to generate induced current in rotor windings.
It should be noted that in actual use, the motor 123 can be monophase machine, then the inverter 1222
Structure make the modification of adaptability, will not repeat them here.
The 4th common-mode filter 1223, institute can also be connected between the outdoor machine of air-conditioner electric controller 122 and the motor 123
The 4th common-mode filter 1223 is stated for realizing common mode filtering.4th common-mode filter 1223 connects the inverter 1222
Output end, in the present embodiment, the 4th common-mode filter 1223 is three-phase common-mode filter, is responsible for filtering out intermediate frequency supreme
Frequency harmonic component, thus the magnetic core of inductance is ferrite nickel zinc material in the 4th common-mode filter 1223, the described 4th is total
The type and material of mode filter 1223 can be set according to the type of the motor 123, be not limited to this embodiment.
As shown in Figure 1, first common-mode filter 13 is set to the power end of the air-conditioning internal machine, mainly to filter out
12 frequency conversion system of outdoor machine of air-conditioner works generating and posting by what second group of power supply line and described second were grounded
The common mode interference of raw parametric resonance aggravation.
Specifically, in the present embodiment, first common-mode filter 13 is set to the electric network source and the air-conditioning
Between the power end of interior machine 11, and close to the power end of the air-conditioning internal machine 11.First common-mode filter 13 includes first
Common mode inductance Lcm1；The first input end of the first common mode inductance Lcm1 connects the firewire L of the electric network source, the first output
End connects the first power end of the air-conditioning internal machine 11；The second input terminal of the first common mode inductance Lcm1 connects the power grid
The zero curve N of power supply, second output terminal connect the second source end of the air-conditioning internal machine 11.In the present embodiment, described first is total
For two groups of coil windings of mould inductance Lcm1 on same magnetic core, the magnetic core of the first common mode inductance Lcm1 includes but is not limited to iron
Ferrite core, amorphous magnetic core.
It should be noted that in the present embodiment, first common-mode filter 13 is set in the air-conditioning internal machine 11,
First common-mode filter 13 can also be set to the outside of the air-conditioning internal machine 11 in actual use, not with this implementation
Example is limited.
As shown in Figure 1, passing through line impedance stabilization net work (LISN, Line between AC power source and ground wire under test mode
Impedance Stabilization Network) 14 connections, it is surveyed by the blocked impedance of the line impedance stabilization net work 14
Common mode interference is tried whether within standard；Under actual working environment, the line impedance stabilization net work 14 is not present.
As shown in Figure 1, second group of power supply line being connected between the air-conditioning internal machine 11 and the outdoor machine of air-conditioner 12 and
(the second ground line includes but is not limited to cable to second ground line group long lead system 15, further includes being connected to the air-conditioning
Copper pipe or other conductors between the ground terminal of interior machine 11 and the ground terminal of the outdoor machine of air-conditioner 12), the outdoor machine of air-conditioner 12
The common mode current generated in frequency conversion system, the third common mode filtering that a part passes through the power input setting in outdoor machine of air-conditioner 12
Device 121 and inhibit in the 4th common-mode filter 1223 for being arranged of input terminal of motor 123, another part passes through outdoor machine of air-conditioner
Second group of power supply line between 12 and the air-conditioning internal machine 11 and the second ground line (and air-conditioning internal machine 11 and outdoor machine of air-conditioner 12
Between the copper pipe that connects, be not shown in the figure) flow into power grid.Due to the length between the outdoor machine of air-conditioner 12 and the air-conditioning internal machine 11
Cable (and copper pipe) is too long, and parasitism has multiple inductance Le11, Le12 ... Le1n on power supply line, on ground line also parasitism have it is more
A inductance Le11 ', Le12 ' ... Le1n ', parasitism has multiple capacitor Ce11, Ce12 ... Ce1n between power supply line and ground line,
Parasitic capacitance and parasitic inductance form LC resonance network, and the common mode current generated in the frequency conversion system of outdoor machine of air-conditioner 12 is by the LC
Resonance can be generated after resonant network, so that common mode current aggravates, be unfavorable for the decaying of EMI.
The present invention is inserted into common mode inductance by the power end in the rear end of above-mentioned LC resonance network namely the air-conditioning internal machine
Lcm1, to inhibit the common mode current after being amplified by LC resonance network.Rather than in the front end of LC resonance network namely the air-conditioning
The power end of outer machine increases common-mode filter, effectively inhibits air-conditioning system and interferes the EMI that power grid introduces.
Further, 12 frequency conversion system of outdoor machine of air-conditioner can also be filtered out using the leakage inductance of the first common mode inductance Lcm1
Work the DM EMI generated, and then air-conditioning system is more effectively inhibited to interfere the EMI that power grid introduces.
Further, the air-conditioning internal machine 11 includes air-conditioning internal machine electric controller 112, and the air-conditioning internal machine electric controller 112 connects
Connect the power end of the air-conditioning internal machine 11, the air-conditioning internal machine electric controller 112 include but is not limited to power module, control module and
Communication module；And under normal conditions, between the power end of the air-conditioning internal machine 11 and the air-conditioning internal machine electric controller 112 also
Second common-mode filter is set, the common mode interference generated to filter out interior Electrical Control plate work.And in the present embodiment, due to
The first common mode inductance Lcm1 is provided between the electric network source and the power end of the air-conditioning internal machine 11, this common mode inductance is not only
The common mode interference generated that can work air-conditioning internal machine electric controller 112 plays inhibitory effect, and the second common mode can also be replaced to filter
Wave device can also inhibit the common mode interference that power grid is flowed into from the outdoor machine of air-conditioner 12.
In the present embodiment, the first common mode inductance Lcm1 and the air-conditioning internal machine electric controller 112 are integrated in same electricity
On the plate of road.In other embodiments, the first common mode inductance Lcm1 is also external to 112 circuit of air-conditioning internal machine electric controller
Plate can according to need setting, be not limited to this embodiment.
It should be noted that in actual use, three-phase alternating-current supply (including three fire are can be used in the electric network source
Line), then correspondingly first common mode inductance includes three coils being wound on same magnetic core, and specific connection relationship is with reference to single
Phase AC power source, will not repeat them here.
Embodiment two
As shown in figure 3, the present embodiment provides a kind of common-mode interference suppression circuit 1 of air-conditioning, it is different from embodiment one it
It is in first common-mode filter 13 is set between the power end of the air-conditioning internal machine 11 and second group of power supply line
(on second group of power supply line of the power end of the air-conditioning internal machine 11).
Specifically, first common-mode filter 13 includes the second common mode inductance Lcm2；The second common mode inductance Lcm2
First input end connect the first power end of the air-conditioning internal machine 11, the first output end connects to be passed in second group of power supply line
The conducting wire of defeated firewire L signal；Just input terminal connects the second of the air-conditioning internal machine 11 to the second of the second common mode inductance Lcm2
Power end, second output terminal connect the conducting wire that zero curve n-signal is transmitted in second group of power supply line.In the present embodiment, described
In on same magnetic core, the magnetic core of the second common mode inductance Lcm2 includes but not two groups of coil windings of second common mode inductance Lcm2
It is limited to FERRITE CORE, amorphous magnetic core.
As one embodiment of the present invention, in the present embodiment, the air-conditioning internal machine 11 includes the second common mode filtering
Device 111 and air-conditioning internal machine electric controller 112；One end of second common-mode filter 111 connects the power supply of the air-conditioning internal machine 11
End, the other end connect the air-conditioning internal machine electric controller 112.Second common-mode filter 111 and the air-conditioning internal machine electric controller
112 can be integrated on same circuit board, and second common-mode filter 111 is also external to the air-conditioning internal machine electric controller 112
Circuit board can according to need setting, be not limited to this embodiment.
The other structures and specific effect of the common-mode interference suppression circuit 1 of the air-conditioning are the same as example 1, herein
It does not repeat one by one.
Embodiment three
As shown in figure 4, the present embodiment provides a kind of common-mode interference suppression circuit 1 of air-conditioning, it is different from embodiment one it
It is in first common-mode filter 13 further includes first capacitor Cy1 and the second capacitor Cy2；The one of the first capacitor Cy1
End connects the first power end of the air-conditioning internal machine 11, other end connection first ground line；The one of the second capacitor Cy2
End connects the second source end of the air-conditioning internal machine 11, other end connection first ground line.
Specifically, first capacitor Cy1 and the second capacitor Cy2 can guide common mode current to be back to common mode source, Ye Jikong
Outer machine 12 is adjusted, air-conditioning system is effectively inhibited and the EMI that power grid introduces is interfered.
It should be noted that the first capacitor Cy1 and the second capacitor Cy2 are also applied for embodiment two, such as Fig. 5 institute
Show, will not repeat them here.
In the present embodiment, the first capacitor Cy1 and the second capacitor Cy2 and the air-conditioning internal machine electric controller 112
It is integrated on same circuit board.In other embodiments, the first capacitor Cy1 and the second capacitor Cy2 also external to
112 circuit board of air-conditioning internal machine electric controller is separately provided, and can according to need setting, is not limited to this embodiment.
It should be noted that when the electric network source uses three-phase alternating-current supply, correspondingly first common-mode filter
13 further include three capacitors, is connected across between three firewires of the electric network source and first ground line respectively.
Example IV
As shown in Figures 6 and 7, the present embodiment provides a kind of common-mode interference suppression circuits 1 of air-conditioning, with embodiment one, implementation
Example two and embodiment three the difference is that, the ground terminal of the air-conditioning internal machine 11 is provided with the first inductance Ls, and described
First inductance Ls is series on first ground line, i.e., one end of the described first inductance Ls connects the power grid by conducting wire
Ground wire, the other end connect the ground terminal of the air-conditioning internal machine by conducting wire.
Specifically, the effect of the first inductance Ls and the effect of common mode inductance Lcm1 are essentially identical, do not go to live in the household of one's in-laws on getting married one by one herein
It states.
The other structures of the common-mode interference suppression circuit of the air-conditioning of the present embodiment, the principle for inhibiting common mode interference and specific
Effect is identical as any one in one~embodiment of embodiment three, will not repeat them here.
The present invention by the equivalent position of air-conditioning internal machine 11 tandem electric inductance, shunt capacitance improve due to long cable
Resonance caused by the parasitic parameter Le1, Ce1, Le2 of introducing effectively inhibits air-conditioning system and interferes the EMI that power grid introduces；
It can realize that outdoor machine of air-conditioner electric-controlled plate minimizes simultaneously, to reduce cost.
In conclusion the present invention provides a kind of common-mode interference suppression circuit of air-conditioning, comprising: air-conditioning internal machine, the air-conditioning
The power end of interior machine connects electric network source by first group of power supply line, and the ground terminal of the air-conditioning internal machine is connected by the first ground line
The ground wire to get access to grid；The power end of outdoor machine of air-conditioner, the outdoor machine of air-conditioner connects the air-conditioning internal machine by second group of power supply line
Power end, the ground terminal of the outdoor machine of air-conditioner connect the ground terminal of the air-conditioning internal machine by the second ground line；Wherein, the sky
The power end of machine is provided with the first common-mode filter in adjusting, to filter out that the work of outdoor machine of air-conditioner frequency conversion system generates and pass through institute
State the common mode interference of second group of power supply line and the parasitic parameter resonance aggravation on second ground line.Air-conditioning of the invention is total to
Equivalent position tandem electric inductance of the mould codan in air-conditioning internal machine, shunt capacitance inhibit common mode current to flow into power grid with this,
Air-conditioning system is effectively inhibited to interfere the EMI that power grid introduces.So the present invention effectively overcome it is in the prior art various
Disadvantage and have high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (10)
1. a kind of common-mode interference suppression circuit of air-conditioning, which is characterized in that the common-mode interference suppression circuit of the air-conditioning is at least wrapped
It includes:
The power end of air-conditioning internal machine, the air-conditioning internal machine connects electric network source by first group of power supply line, the air-conditioning internal machine
The ground wire that ground terminal passes through the first ground line connection power grid；
Outdoor machine of air-conditioner, the power end of the outdoor machine of air-conditioner connect the power end of the air-conditioning internal machine, institute by second group of power supply line
The ground terminal for stating outdoor machine of air-conditioner connects the ground terminal of the air-conditioning internal machine by the second ground line；
Wherein, the power end of the air-conditioning internal machine is provided with the first common-mode filter.
2. the common-mode interference suppression circuit of air-conditioning according to claim 1, it is characterised in that: first common-mode filter
Including the first common mode inductance being series on first group of power supply line.
3. the common-mode interference suppression circuit of air-conditioning according to claim 2, it is characterised in that: the air-conditioning internal machine includes sky
Electrical Control device, the air-conditioning internal machine electric controller connect the power end of the air-conditioning internal machine in adjusting.
4. the common-mode interference suppression circuit of air-conditioning according to claim 1, it is characterised in that: first common-mode filter
Including the second common mode inductance being series on second group of power supply line.
5. the common-mode interference suppression circuit of air-conditioning according to claim 4, it is characterised in that: the air-conditioning internal machine includes the
Two common-mode filters and air-conditioning internal machine electric controller, second common-mode filter be set to the power end of the air-conditioning internal machine with
Between air-conditioning internal machine electric controller.
6. according to the common-mode interference suppression circuit of air-conditioning described in claim 2~5 any one, it is characterised in that: described
One common-mode filter further includes capacitance group, and each capacitor is respectively arranged at power end and the institute of the air-conditioning internal machine in the capacitance group
It states between the ground terminal of air-conditioning internal machine.
7. the common-mode interference suppression circuit of air-conditioning according to claim 6, it is characterised in that: the ground connection of the air-conditioning internal machine
End is provided with the first inductance, and first inductance is series on first ground line.
8. the common-mode interference suppression circuit of air-conditioning described in any one according to claim 1~5, it is characterised in that: the sky
The ground terminal of machine is provided with the first inductance in adjusting, and first inductance is series on first ground line.
9. the common-mode interference suppression circuit of air-conditioning according to claim 1, it is characterised in that: the outdoor machine of air-conditioner includes the
Three common-mode filters, outdoor machine of air-conditioner electric controller and motor, the third common-mode filter are set to the power supply of the outdoor machine of air-conditioner
Between end and outdoor machine of air-conditioner electric controller, the motor connects the output end of the outdoor machine of air-conditioner electric controller.
10. the common-mode interference suppression circuit of air-conditioning according to claim 9, it is characterised in that: the outdoor machine of air-conditioner is automatically controlled
Device includes:
Power inverter, for input AC electricity to be converted to DC bus-bar voltage；
Inverter is connected to the output end of the power inverter, for converting output exchange for the DC bus-bar voltage
Electricity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910248118.9A CN109873553A (en) | 2019-03-29 | 2019-03-29 | The common-mode interference suppression circuit of air-conditioning |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910248118.9A CN109873553A (en) | 2019-03-29 | 2019-03-29 | The common-mode interference suppression circuit of air-conditioning |
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| CN201910248118.9A Pending CN109873553A (en) | 2019-03-29 | 2019-03-29 | The common-mode interference suppression circuit of air-conditioning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110736250A (en) * | 2019-10-31 | 2020-01-31 | 广东美的制冷设备有限公司 | Drive control circuit board and air conditioner |
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