CN209488450U - Reduce circuit, electronic equipment and the air conditioner of electromagnetic interference - Google Patents
Reduce circuit, electronic equipment and the air conditioner of electromagnetic interference Download PDFInfo
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- CN209488450U CN209488450U CN201920285888.6U CN201920285888U CN209488450U CN 209488450 U CN209488450 U CN 209488450U CN 201920285888 U CN201920285888 U CN 201920285888U CN 209488450 U CN209488450 U CN 209488450U
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Abstract
The utility model discloses the circuit, electronic equipment and the air conditioners that reduce electromagnetic interference, including current supply circuit and the first resonance signal return circuit, the first resonance signal return circuit includes signal output end and the signal input part for being electrically connected with heat sink assembly, the signal output end is connected on current supply circuit, so that the resonance interference signal on heat sink assembly is back to current supply circuit by the first resonance signal return circuit.It is electrically connected heat sink assembly and current supply circuit by the first resonance signal return circuit, the path that one returns to current supply circuit for resonance interference signal on radiating subassembly device is formed and improves the EMC performance of complete machine to reduce leaking for resonance interference signal.
Description
Technical field
The utility model belongs to electronic circuit field, more particularly to reduces circuit, electronic equipment and the air-conditioning of electromagnetic interference
Device.
Background technique
Household electrical appliance on the market at present can apply high-power circuit module to meet the needs of function in circuit,
Such as device for power switching, power correction device etc., and high-power circuit module can generate higher heat, therefore usually require
It is equipped with radiator to radiate to it, however, the use of radiator will lead to the aggravation of electromagnetic interference, reduces the EMC of complete machine
Performance (i.e. Electro Magnetic Compatibility), influences the normal use of product.
Utility model content
The main purpose of the utility model is to provide it is a kind of reduce electromagnetic interference circuit, electronic equipment and air conditioner,
The electromagnetic interference of household electrical appliance generation can be reduced, improve the EMC performance of household electrical appliance.
It is according to the present utility model in a first aspect, provide reduce electromagnetic interference circuit, comprising:
Current supply circuit, for powering for circuit module；
First resonance signal return circuit, the signal input including signal output end and for being electrically connected with heat sink assembly
End, the signal output end are connected on current supply circuit, so that the resonance interference signal on heat sink assembly passes through described first
Resonance signal return circuit is back to current supply circuit.
Circuit module can not only generate heat at work, but also can generate resonance interference signal, and circuit module is in addition to logical
It is outer to cross heat sink assembly heat dissipation, resonance interference signal can be also transmitted in heat sink assembly by distribution parameter, be affected whole
The EMC performance of machine, and the utility model in a first aspect, being electrically connected radiator and power supply by the first resonance signal return circuit
Circuit provides the path returned for the resonance interference signal on radiator, reduces leaking for resonance interference signal, mention
High complete machine EMC performance.
In one specific embodiment of the utility model, the current supply circuit includes:
Power circuit, for converting alternating current to direct current electricity output, the power circuit includes ac input end and straight
Output end is flowed, the ac input end includes firewire input terminal and zero curve input terminal, and the DC output end includes direct current supply
End and light current reference ground；
It further include first capacitor and the second capacitor, the signal output end of the first resonance signal return circuit passes through described
First capacitor is connect with the firewire input terminal, and the signal output end of the first resonance signal return circuit passes through described second
Capacitor is connect with the zero curve input terminal.
The first resonance signal return circuit is connected to the prime of power circuit, since the prime of power circuit is exchange
Electricity input, in order to guarantee the balance of circuit, it is therefore desirable to resonance interference signal be passed through first capacitor respectively and the second capacitor returns
It returns in firewire input terminal and zero curve input terminal, provides the return path of a resonance interference signal, reduce resonance interference
Signal leaks, and improves complete machine EMC performance.
Specifically, the first capacitor and the second capacitor are Y capacitance.The Y capacitance belongs to safety capacitance series, for
After the capacitor for inhibiting powered electromagnetic interference, Y capacitance failure, it not will lead to electric shock, do not jeopardize personal safety.Due to first humorous
Vibration signal return circuit is connected to exchange input, therefore first capacitor and the second capacitor use Y capacitance, can ensure that the peace of circuit
Entirely.
In a specific embodiment of the utility model, the current supply circuit further includes filter circuit, the filtering
The input terminal connection exchange firewire and AC neutral line, the output end of the filter circuit and the ac input end of power circuit of circuit
Connection, the first capacitor and the series connection of the second capacitor are connected to the output end of filter circuit, and first resonance signal returns to electricity
The signal output end on road is connected on the node between the first capacitor and the second capacitor.Filter circuit is arranged can be to input
Ac signal be filtered, such as reduce external common mode interference signal or DM EMI signal, and filter circuit
Setting can using filter element composition filter circuit or use integrated filtering device.The first capacitor and the second electricity
It is installed with and is placed between filter circuit and power circuit, be avoided that the resonance interference signal of return enters filter circuit, avoid the occurrence of
Power circuit saturation or unbalanced situation.
It further include common mode inductance in a specific embodiment of the utility model, the common mode inductance includes being used for
The first input end connecting with firewire and the second input terminal for connecting with zero curve, the common mode inductance further include the first output
End and second output terminal, first output end and second output terminal are inputted with the firewire input terminal and zero curve of power circuit respectively
End connection；
The first capacitor, the second capacitor be connected in series in the common mode inductance the first output end and second output terminal it
Between, first node is provided between the concatenated first capacitor and the second capacitor, the first resonance signal return circuit
Signal output end is connected on the first node, further includes connecting branch over the ground, and the first node by connecting over the ground
Branch is connect with ground wire.
By common mode inductance can with the common mode interference in suppression circuit, due to common mode interference result from phase line and ground wire it
Between, thus the output end of common mode inductance over the ground and the first capacitor connect and the second capacitor play bypass common mode interference signal work
With, the filter circuit based on common mode inductance is constituted, and the signal output end of the first resonance signal return circuit directly connects
It is connected on the first node between first capacitor and the second capacitor, first capacitor and the second capacitor is made not only to have bypass common mode dry
The effect of signal is disturbed, also has the function of returning for the resonance interference signal on radiator, which is utilized available circuit
Element realizes the return of resonance interference signal, not only the design of simplified circuit, but also can save the cost of component.
It further include third capacitor and the 4th capacitor, the third electricity in a specific embodiment of the utility model
Hold and the 4th capacitor is connected in series between the first input end of the common mode inductance and the second input terminal, the concatenated third
Second node is provided between capacitor and the 4th capacitor, the second node is connect with the branch of connection over the ground.Described
Three capacitors and the 4th capacitor are set to the prime of common mode inductance, and the second node between third capacitor and the 4th capacitor is by over the ground
Grounding is connected, the common mode interference signal before can bypassing into common mode inductance improves the inhibition to common mode interference signal and imitates
Fruit.
In order to guarantee the safety of circuit, the third capacitor, the 4th capacitor are Y capacitance.
In a specific embodiment of the utility model, between the first node and the second node over the ground
Connection branch road is provided with the first resistor for weakening resonance signal.When the earth loop of circuit is longer can on ground wire shape
At resonance signal, first electricity is set on branch road by connecting between first node and the second node over the ground
Resistance, can weaken the resonance signal on the ground wire.
Preferably, the resistance value of the first resistor is less than 50 ohm.In order to avoid first resistor influences first capacitor and the
The bypasses over the ground of two capacitors acts on, and the resistance value of the first resistor cannot be arranged too much, and the resistance value setting of first resistor is existed
50 ohm hereinafter, not only can be reduced the resonance signal on ground wire, but also will not influence the normal work of the common mode filtering circuit.
It further include the 5th capacitor and the 6th capacitor, the 5th electricity in a specific embodiment of the utility model
Appearance is connected between the first input end of the common mode inductance and the second input terminal, and the 6th capacitance connection is in the common mode electricity
Between the first output end and second output terminal of sense.Pass through the 5th capacitor and the 6th of common mode inductance input terminal and output end parallel connection
Capacitor can allow DM EMI signal to flow back to AC power cord by the 5th capacitor and the 6th capacitor, avoid DM EMI signal stream
Enter power circuit, plays the role of inhibiting DM EMI signal.
As a kind of above-mentioned embodiment, in order to reduce the impedance of resonance interference signal return, first resonance
Signal return circuit is short-circuit line, i.e., the described signal input part and signal output end are directly electrically connected to form the short-circuit line,
At this moment any electronic component is not provided between signal input part and signal output end, impedance is minimum, convenient for resonance interference letter
Number return.
In above-mentioned another embodiment, low-impedance member is also can be set in the first resonance signal return circuit
The combination of part such as resistance, inductance and capacitor.
Preferably, the 5th capacitor and the 6th capacitor are X capacitor, and the X capacitor belongs to safety capacitance series, for
After the capacitor for inhibiting powered electromagnetic interference, X condenser failure, it not will lead to electric shock, do not jeopardize personal safety, high reliablity.
In a specific embodiment of the utility model, the first resonance signal return circuit further includes returning to branch
Road, one end of the return branch are connect with the signal input part of the first resonance signal return circuit, the other end with it is described
Light current reference ground connection.By the return branch, a connection heat sink assembly and light current reference ground are constructed
Between resonance interference signal return path, the resonance interference signal on heat sink assembly is divided into two-way, passes through the first electricity all the way
Hold and the second capacitor is returned from the ac input end of power circuit, another way is referred to by return branch from the light current of power circuit
Ground terminal returns, and the effect of antiresonance interference signal is more preferable.
Specifically, as a kind of above-mentioned embodiment, the return branch includes the 8th capacitor, the 8th capacitor
One end is connect with the light current reference ground, and the signal input part of the other end and the first resonance signal return circuit connects
It connects.
Specifically, as a kind of above-mentioned embodiment, the return branch further includes 3rd resistor, the 3rd resistor
It is series at the place branch road of the 8th capacitor.
In a specific embodiment of the utility model, the current supply circuit includes:
Power circuit, for converting alternating current to direct current electricity output, the power circuit includes ac input end and straight
Output end is flowed, the DC output end includes DC power supply terminal and light current reference ground；
The signal output end of the first resonance signal return circuit is connect with the light current reference ground.
A connection heat sink assembly and power circuit light current are constructed with reference to ground by the first resonance signal return circuit
Resonance interference signal return path between end, the resonance interference signal on heat sink assembly pass through first resonance signal
Return circuit is back to power circuit light current reference ground, reduces leaking for resonance interference signal, improves the EMC of complete machine
Energy.
As a kind of embodiment of above-described embodiment, the first resonance signal return circuit includes the 7th capacitor, institute
The both ends for stating the 7th capacitor are connect with the signal input part of the first resonance signal return circuit and signal output end respectively.
As the another embodiment of above-described embodiment, the first resonance signal return circuit further includes the second electricity
Resistance, the second resistance are series at the place branch road of the 7th capacitor.
It further include the second resonance signal return circuit in a specific embodiment of the utility model, described second
The input terminal of resonance signal return circuit is connect with ground wire, the output end of the second resonance signal return circuit with it is described weak
Electric reference ground connection.By the way that the second resonance signal return circuit is arranged, the common mode interference signal from ground wire passes through described
Second resonance signal return circuit is back to the light current reference ground of power circuit, to reduce leaking for common mode interference signal.
A kind of embodiment of the second resonance signal return circuit, the second resonance signal return circuit include the
One end of nine capacitors, the 9th capacitor is connect with ground wire, and the other end is connected to light current reference ground.
The another embodiment of the second resonance signal return circuit, the second resonance signal return circuit include
One end of 9th capacitor and the 4th resistance, the 4th resistance is connect with ground wire, the other end and the 9th capacitance connection, and the described 9th
Capacitor is connect relative to the other end of the 4th resistance with light current reference ground.
The second aspect of the utility model, provides electronic equipment, including circuit module and for radiating for circuit module
Heat sink assembly, further include the circuit of the low EMI of the above-mentioned any embodiment of the utility model first aspect, institute
It states current supply circuit to connect with the circuit module, the signal input part and the radiator of the first resonance signal return circuit
Component electrical connection, the signal output end of the first resonance signal return circuit are connect with the current supply circuit.
Further, the heat sink assembly includes radiator body and the refrigerant pipe that is set in radiator body, described
The signal input part of first resonance signal return circuit is electrically connected with the radiator body or the refrigerant pipe.
The circuit module includes device for power switching, the device for power switching and the thermally conductive company of the heat sink assembly
It connects.Since temperature is higher at work for device for power switching, heat sink assembly is needed to radiate it, device for power switching exists
Switching signal and harmonic signal can be generated when work, the harmonic signal is coupled in heat sink assembly by distribution parameter, shape
At resonance interference signal, the resonance interference signal is back in current supply circuit by the first resonance signal return circuit, is avoided
Resonance interference signal leaks.
Specifically, the device for power switching be IGBT switching tube, power factor correction module, fast recovery diode one
Kind combination of the above.
The third aspect of the utility model provides air conditioner, including any embodiment party of the utility model first aspect
The circuit of the low EMI of formula or electronic equipment including any embodiment of the utility model second aspect.
A technical solution in the utility model above-mentioned technical proposal at least has the following advantages that or one of beneficial effect:
It is electrically connected heat sink assembly and current supply circuit by the first resonance signal return circuit, forms one for resonance on radiating subassembly device
The path that interference signal returns to current supply circuit improves complete machine EMC performance to reduce leaking for resonance interference signal.
Detailed description of the invention
Circuit topology schematic diagram of the Fig. 1 between circuit module known for inventor and heat sink assembly；
Fig. 2 is the circuit diagram of the utility model first embodiment；
Fig. 3 is the circuit diagram of the utility model second embodiment；
Fig. 4 is the circuit diagram of the utility model 3rd embodiment；
Fig. 5 is the circuit diagram of the utility model fourth embodiment；
Fig. 6 is the circuit diagram of the 5th embodiment of the utility model；
Fig. 7 is the circuit diagram of the utility model sixth embodiment；
Fig. 8 is the circuit diagram of the 7th embodiment of the utility model；
Fig. 9 is the circuit diagram of the 8th embodiment of the utility model；
Figure 10 is the circuit diagram of the 9th embodiment of the utility model；
Figure 11 is the circuit diagram of the tenth embodiment of the utility model；
Figure 12 is the circuit diagram of the 11st embodiment of the utility model；
Figure 13 is the circuit diagram of the 13rd embodiment of the utility model；
Figure 14 is the circuit diagram of the 14th embodiment of the utility model；
Figure 15 is the cross-sectional view of the structure of the first embodiment of the utility model heat sink assembly；
Figure 16 is the cross-sectional view of the structure of second of embodiment of the utility model heat sink assembly.
Specific embodiment
The embodiments of the present invention is described below in detail, the example of embodiment is shown in the accompanying drawings, wherein identical
Or similar label indicates same or similar element or element with the same or similar functions from beginning to end.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and should not be understood as to the utility model
Limitation.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first " and " second " as a result, can be expressed
Or implicitly include one or more feature.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " connection "
It shall be understood in a broad sense, for example, it may be fixedly connected or be flexibly connected, may be a detachable connection or non-dismountable connection,
Or it is integrally connected；It can be mechanical connection, be also possible to be electrically connected or can mutually communicate；It can be directly connected, it can also
Indirectly connected through an intermediary, can be the connection inside two elements or the interaction relationship of two elements.
Following disclosure provides many different embodiments or example is used to realize the different structure of the utility model.
It is the circuit topology principle between a kind of circuit module and heat sink assembly known for inventor shown in referring to Fig.1
Figure, including filter circuit, power circuit and circuit module, wherein firewire L and zero curve N from alternating current pass through filter circuit and electricity
The ac input end of source circuit connects, and the alternating current of input is converted into direct current electricity output to circuit module by power circuit, described
Filter circuit, power circuit are configured to the current supply circuit of circuit module power supply.
Wherein the circuit module includes IGBT switching tube SW, power factor correction module IPM and fast recovery diode D1,
When circuit module works, IGBT switching tube SW, power factor correction module IPM and fast recovery diode D1 can generate biggish heat
Amount, it is therefore desirable to be radiated by heat sink assembly HS.However, it is found by the inventors that the application of heat sink assembly HS will lead to
The aggravation of resonance interference signal declines complete machine EMC performance (Electro Magnetic Compatibility).
Based on this, inventor continues to the further research and analysis in the source of resonance interference signal, shown referring to Fig.1, is
Guarantee heat dissipation effect, heat sink assembly HS need to be close to device for power switching during installation installation connection, or by thermally conductive
Material connects (such as silicone grease), and by taking IGBT switching tube SW as an example, IGBT switching tube SW can generate high-frequency switching signal when working, by
There can be the first distribution electricity between IGBT switching tube SW held against heat sink component HS, IGBT switching tube SW and heat sink assembly HS
Hold chp1, high-frequency switching signal can be transferred in heat sink assembly HS by distribution capacity chp1, form resonance interference signal.
Similarly, there are the second distribution capacity chp2, power factor correction modules between fast recovery diode D1 and heat sink assembly HS
There are third distribution capacity chp3 between IPM and heat sink assembly HS.
It should be noted that above-mentioned first distribution capacity chp1, the second distribution capacity chp2 and third distribution capacity chp3
In response to electric elements in circuit module setting and change, such as the electric elements in circuit module are increased and decreased or are replaced,
The variation that the distribution capacity between heat sink assembly HS and electric elements can be changed, in addition other than distribution capacity, resonance is dry
Disturbing signal can also be transmitted by other distribution parameters, such as distributed inductance or distributed resistance.On the whole, heat sink assembly HS
There can be a total Equivalent Distributed parameter chp0 between circuit module, the resonance interference signal that circuit module generates is by being somebody's turn to do
Equivalent Distributed parameter chp0 is transmitted in heat sink assembly HS.
If heat sink assembly HS is hanging, heat sink assembly HS itself is equivalent to an antenna, and resonance interference signal can be
It is vibrated back and forth in heat sink assembly HS, resonance interference signal is converted into electromagnetic wave and is output in the space of surrounding, is seriously affected
The EMC performance of complete machine.Shown in referring to Fig.1, if connecting ground wire by heat sink assembly HS connection ground wire PE, or by shell metal plate
PE, the resonance interference signal become common mode interference signal Icm and flow to ground wire PE, so that complete machine has been had more a new common mode dry
Path is disturbed, leaking for common mode interference signal is caused.Especially for the heat sink assembly HS using refrigerant pipe, the resonance is dry
Distal end return can be transferred to by the refrigerant pipe by disturbing signal also, exacerbate leaking for common mode interference signal, while can also make whole
The decline of the EMC performance of machine.
Based on this, the resonance interference signal on heat sink assembly HS how to be avoided to leak, is in the urgent need to address at present
Technical problem.
Referring to shown in Fig. 2, it is the first embodiment of the utility model, provides the circuit for reducing electromagnetic interference, comprising:
Current supply circuit, for powering for circuit module；
First resonance signal return circuit 100, including signal output end 102 and for being electrically connected with heat sink assembly HS
Signal input part 101, the signal output end 102 are connected on current supply circuit, so that the resonance on heat sink assembly HS interferes
Signal is back to current supply circuit by the first resonance signal return circuit 100.
In the present embodiment, circuit module can not only generate heat at work, but also can generate resonance interference signal, electricity
Road module is outer except through heat sink assembly HS heat dissipation, can be also transmitted to resonance interference signal by Equivalent Distributed parameter chp0
In heat sink assembly HS, the EMC performance of complete machine is affected, and in the present embodiment, pass through 100 electricity of the first resonance signal return circuit
Heat sink assembly HS and current supply circuit are connected, the road returned for the resonance interference signal on heat sink assembly HS is provided
Diameter, when heat sink assembly HS is hanging, the resonance interference signal on heat sink assembly HS passes through the first resonance signal return circuit
100 are back to current supply circuit, electromagnetic radiation caused by avoiding resonance interference signal from vibrating back and forth in heat sink assembly HS；When scattered
When hot device assembly HS is grounded or is grounded by shell metal plate, closed on since the first resonance signal return circuit 100 provides one
Return path, most resonance interference signal by the first resonance signal return circuit 100 return current supply circuit, reduce
The intensity of common mode interference signal Icm improves complete machine to reduce leaking for common mode interference signal or resonance interference signal
EMC performance.
Referring to shown in Fig. 3, the utility model second embodiment provides the circuit for reducing electromagnetic interference, further, described
Current supply circuit includes:
Power circuit, for converting alternating current to direct current electricity output, the power circuit includes ac input end and straight
Output end is flowed, the ac input end includes firewire input terminal Lin and zero curve input terminal Nin, and the DC output end includes straight
Feeder ear p+ and light current reference ground DC_N is flowed, when work, power circuit will come from firewire input terminal Lin and zero curve input terminal
The alternating current of Nin is converted to direct current and exports from DC power supply terminal p+ and light current reference ground DC_N, wherein DC power supply terminal p+
It is equivalent to the anode of power circuit, light current reference ground DC_N is equivalent to the cathode of power circuit, the DC power supply terminal p+,
Circuit module and light current reference ground DC_N constitute a DC loop.Wherein the power circuit can use rectification circuit example
If rectifier bridge realizes the conversion of alternating current and direct current, since rectification circuit or AC-DC conversion circuit belong to common knowledge, herein
It repeats no more.
It further include that first capacitor CY1 and the second capacitor CY2, the first capacitor CY1 and the second capacitor CY2 series connection is attempted by
On the firewire input terminal Lin and zero curve input terminal Nin of the power circuit, the concatenated first capacitor CY1 and the second capacitor
First node a, the signal output end 102 of the first resonance signal return circuit 100 and described first are provided between CY2
The signal output end 102 of node a connection, i.e., the described first resonance signal return circuit 100 passes through the first capacitor respectively
The firewire input terminal Lin of CY1, the second capacitor CY2 and power circuit, the Nin connection of zero curve input terminal.
In the present embodiment, the first resonance signal return circuit 100 is short-circuit line, i.e., described 101 He of signal input part
Signal output end 102 is directly electrically connected to form the short-circuit line, at this moment between signal input part 101 and signal output end 102
It is not provided with any electronic component, impedance is minimum, convenient for the return of resonance interference signal.Wherein signal input part 101 and letter
It can be directly connected to, can also be attached by conducting wire or flexible circuit board by printed circuit between number output end 102.
In above-mentioned another embodiment, the first resonance signal return circuit 100 may be set to be filtering
Circuit is exported from signal output end 102 to current supply circuit again after being filtered to resonance interference signal.
In the present embodiment, the first resonance signal return circuit 100 is connected to the prime of power circuit, due to the electricity
The prime of source circuit is alternating current input, in order to guarantee the balance of circuit, it is therefore desirable to it is humorous that resonance interference signal are divided into two-way
Vibration interference signal, resonance interference signal returns to firewire input terminal Lin, the interference of another way resonance by first capacitor CY1 all the way
Signal returns to zero curve input terminal Nin by the second capacitor CY2.The connection type provides the return of a resonance interference signal
Path reduces leaking for resonance interference signal, improves complete machine EMC performance.
Specifically, the first capacitor CY1 and the second capacitor CY2 is Y capacitance.The Y capacitance belongs to safety capacitor system
Column not will lead to electric shock, do not jeopardize personal safety for the capacitor for inhibiting powered electromagnetic to interfere after Y capacitance failure.By
It is connected to exchange input in the first resonance signal return circuit 100, therefore first capacitor CY1 and the second capacitor CY2 is using Y electricity
Hold, can ensure that the safety of circuit.
Referring to shown in Fig. 4, the 3rd embodiment of the utility model provides the circuit for reducing electromagnetic interference, the present embodiment
Difference with second embodiment is that the current supply circuit further includes filter circuit, and the input terminal of the filter circuit connects fire
Line L and zero curve N, the output end of the filter circuit and the ac input end of power circuit connect.
The first capacitor CY1 and the second capacitor CY2 series connection is connected to the output end of filter circuit, the first resonance letter
The signal output end 102 of number return circuit 100 is connected on the node between the first capacitor CY1 and the second capacitor CY2.For
Electrical circuit is provided with filter circuit and can be filtered to the ac signal of input, such as reduces external common mode interference
Signal or DM EMI signal, and the setting of filter circuit can be using filter element composition filter circuit or using integrated
Filtering device or filtering chip.
Such as refering to what is shown in Fig. 4, the filter circuit a kind of embodiment, including common mode inductance L1 and be respectively arranged at
The first X capacitor CX11 and the 2nd X capacitor CX12 before and after the common mode inductance L1 between firewire and zero curve, further include being arranged in series
The first Y capacitance CY11 and the second Y capacitance CY12 between common mode inductance L1 input terminal firewire and zero curve, are arranged in series in common mode
Third Y capacitance CY13 and the 4th Y capacitance CY14 between inductance L1 output end firewire and zero curve, the first Y capacitance CY11,
Node between node between two Y capacitance CY12 and third Y capacitance CY13, the 4th Y capacitance CY14 is connect with ground wire PE respectively.
Above-mentioned filter circuit forms pi filter structure, by the first X capacitor CX11 and the 2nd X capacitor CX12 can allow it is external
DM EMI signal stream returns AC power cord, the first Y capacitance CY11, the second Y capacitance CY12, third Y capacitance CY13 and the 4th Y electricity
Hold CY14 and play the role of bypass to common mode interference signal, above-mentioned filter circuit can effectively inhibit DM EMI signal and common mode dry
Disturb signal.Above-mentioned filter circuit is one of embodiment, and it is different that those skilled in the art can according to need setting
Filter circuit or filter integrated device.
In the present embodiment, the first capacitor CY1 and the second capacitor CY2 are set between filter circuit and power circuit,
I.e. the firewire between filter circuit and power circuit and zero curve return resonance interference signal respectively, are avoided that the resonance of return is dry
Signal is disturbed to enter filter circuit and current supply circuit saturation or unbalanced situation occur.
Referring to Figure 5, it is the fourth embodiment of the utility model, provides the circuit for reducing electromagnetic interference, further include
Common mode inductance L1, the common mode inductance L1 include first input end i1 for connecting with firewire L and for connecting with zero curve N
Second input terminal i2, the common mode inductance L1 further includes the first output end o1 and second output terminal o2, the first output end o1
It is connect respectively with the firewire input terminal Lin of power circuit and zero curve input terminal Nin with second output terminal o2；
The first capacitor CY1, the second capacitor CY2 are connected in series in the first output end o1 and of the common mode inductance L1
Between two output end o2, it is provided with first node a between the concatenated first capacitor CY1 and the second capacitor CY2, described first
The signal output end 102 of resonance signal return circuit 100 is connected on the first node a, further includes connecting branch over the ground
103, the first node a are connect by connection branch 103 over the ground with ground wire PE.
The common mode inductance L1 being arranged on current supply circuit can inhibit common mode interference signal, since common mode interference results from phase line
Between ground wire PE, therefore the output end of common mode inductance L1 is over the ground and the first capacitor CY1 connect and the second capacitor CY2 play bypass
The effect of common mode interference signal, constitutes the filter circuit based on common mode inductance L1, and the first resonance signal return circuit
100 signal output end 102 is directly connected on the first node a between first capacitor CY1 and the second capacitor CY2, and at this moment
One capacitor CY1 and the second capacitor CY2 not only has the function of bypassing common mode interference signal, also have on heat sink assembly HS
The effect that resonance interference signal returns, the element which is utilized available circuit realize the return of resonance interference signal, no
Only simplify L circuit design, and the cost of component can be saved.
It further, referring to Figure 5, further include the 5th capacitor CX5 and the 6th capacitor CX6, the 5th capacitor CX5 connection
Between the first input end i1 and the second input terminal i2 of the common mode inductance L1, the 6th capacitor CX6 is connected to described total
Between the first output end o1 and second output terminal o2 of mould inductance L1.By common mode inductance L1 input terminal and output end it is in parallel the
Five capacitor CX5 and the 6th capacitor CX6 can allow DM EMI signal to return to alternating current by the 5th capacitor CX5 and the 6th capacitor CX6
Source line avoids DM EMI signal from flowing into power circuit, plays the role of inhibiting DM EMI signal.
Wherein the 5th capacitor CX5 and the 6th capacitor CX6 is X capacitor, and the X capacitor belongs to safety capacitance series,
For the capacitor for inhibiting powered electromagnetic to interfere, after X condenser failure, it not will lead to electric shock, do not jeopardize personal safety, reliability
It is high.
It is the 5th embodiment of the utility model referring to shown in Fig. 6, is the further improved drop of above-mentioned fourth embodiment
The circuit of low EMI, further includes third capacitor CY3 and the 4th capacitor CY4, the third capacitor CY3 and the 4th capacitor CY4
It is connected in series between the first input end i1 of the common mode inductance L1 and the second input terminal i2, the concatenated third capacitor
Second node b is provided between CY3 and the 4th capacitor CY4, the second node b is connect with the branch of connection over the ground 103.
The third capacitor CY3 and the 4th capacitor CY4 is set to the prime of common mode inductance L1, third capacitor CY3 and the 4th capacitor CY4 it
Between second node b by over the ground connection branch 103 be grounded, the common mode interference signal before common mode inductance L1 can be bypassed into,
Improve the inhibitory effect to common mode interference signal.
Preferably, in order to guarantee the safety of circuit, the third capacitor CY3, the 4th capacitor CY4 are Y capacitance.
Further, it is provided with and is used on the branch of connection over the ground 103 between the first node a and the second node b
Weaken the first resistor R1 of resonance signal.Inventor has found in ground wire PE under study for action there are the lesser resonance signal of amplitude,
Especially when ground wire PE setting it is longer when, which is more obvious.For example, for air-conditining and window machine, due to ground wire
PE is all concentrated in a shell, and the length of ground wire PE is shorter, and the resonance signal on ground wire PE is unobvious, but for split type
Air-conditioning, due to being provided with the ground wire PE of relatively long distance between outdoor unit and indoor unit, there are an apparent resonance signal,
The EMC performance for influencing complete machine, therefore, by the branch of connection over the ground 103 between first node a and the second node b
The first resistor R1 is set, the resonance signal on the ground wire PE can be weakened.
Preferably, the resistance value of the first resistor R1 is less than 50 ohm.In order to avoid first resistor R1 influences first capacitor
The bypass over the ground of CY1 and the second capacitor CY2 acts on, the resistance value of the first resistor R1 cannot be arranged it is too much, by first resistor
The resistance value of R1 is arranged in 50 ohm hereinafter, not only can be reduced the resonance signal on ground wire PE, but also will not influence the common mode filtering electricity
The normal work on road.
Further, referring to shown in Fig. 7, it is the sixth embodiment of the utility model, provides the circuit for reducing electromagnetic interference,
Difference with above-mentioned second embodiment is that the first resonance signal return circuit 100 further includes return branch 104, described
One end of return branch 104 is connect with the signal input part 101 of the first resonance signal return circuit 100, the other end and institute
The light current reference ground DC_N connection stated.By the return branch 104, construct a connection heat sink assembly HS with it is weak
Resonance interference signal return path between electric reference ground DC_N, the resonance interference signal on heat sink assembly HS are divided into two
Road is returned by first capacitor CY1, the second capacitor CY2 from the ac input end of power circuit all the way, and another way is by returning to branch
Road 104 is returned from the light current reference ground DC_N of power circuit, by increasing the output end of return path, antiresonance interference letter
Number effect it is more preferable.
Specifically, a kind of embodiment of the return branch 104, including the 8th capacitor C8, the 8th capacitor C8's
One end is connect with the light current reference ground DC_N, and the signal of the other end and the first resonance signal return circuit 100 is defeated
Enter 101 connection of end.Since resonance interference signal is high-frequency signal, light current reference ground can be back to by the 8th capacitor C8
DC_N。
Refering to what is shown in Fig. 7, the another embodiment of the return branch 104, the return branch 104 further includes third
Resistance R3, the 3rd resistor R3 are series at the place branch road of the 8th capacitor C8, i.e., the described signal input part 101, third electricity
Resistance R3, the 8th capacitor C8, light current reference ground DC_N are sequentially connected.The 3rd resistor R3 can weaken on return branch 104
The intensity of resonance interference signal.
The return branch 104 can be applied in above-mentioned second embodiment into the 5th embodiment any embodiment,
It only needs to be arranged between the light current reference ground DC_N and the signal input part 101 of the first resonance signal return circuit 100
Above-mentioned return branch 104.
Referring for example to the 7th embodiment of the utility model shown in Fig. 8, the circuit for reducing electromagnetic interference, this reality are provided
It applies in example, is further improved on the basis of the 5th embodiment reduces the circuit of electromagnetic interference, including in detail such as the 5th embodiment
Described, by common mode inductance L1 and first capacitor CY1, the second capacitor CY2, third capacitor CY3, the 4th capacitor CY4, the 5th capacitor
The π shape filter circuit of CX5, the 6th capacitor CX6 composition, wherein first capacitor CY1, the second capacitor CY2, third capacitor CY3, the 4th
Capacitor CY4 plays the role of bypassing common mode interference signal, and common mode inductance L1 is for inhibiting common mode interference signal, the 5th capacitor CX5
With the 6th capacitor CX6 for inhibiting DM EMI signal to enter power circuit, the first resonance signal return circuit 100 is connected
First node a between heat sink assembly HS and first capacitor CY1, the second capacitor CY2 is also provided with described on this basis
Connect the return branch 104 of 100 signal input part 101 and light current reference ground DC_N of the first resonance signal return circuit.Heat dissipation
Resonance interference signal a part on device assembly HS is back to the light current reference ground DC_ of power circuit by return branch 104
N, another part passes through first capacitor CY1 respectively, the second capacitor CY2 is back to the firewire input terminal Lin and zero curve of power circuit
Input terminal Nin, the first resistor R1 between first node a and second node b also function to the effect for weakening ground wire PE resonance signal.This
In embodiment, the output end returned by two resonance interference signals of setting can effectively prevent leaking for resonance interference signal, mention
The EMC performance of high complete machine.
Referring to shown in Fig. 9, the 8th embodiment of the utility model provides the circuit for reducing electromagnetic interference, the power supply
Circuit includes:
Power circuit, for converting alternating current to direct current electricity output, the power circuit includes ac input end and straight
Output end is flowed, the DC output end includes DC power supply terminal p+ and light current reference ground DC_N；It further include filter circuit, it is described
The input terminal connection exchange firewire of filter circuit and AC neutral line, the output end of the filter circuit and exchanging for power circuit are defeated
Enter end connection；It further include the first resonance signal return circuit 100, the signal input of the first resonance signal return circuit 100
End 101 is electrically connected with heat sink assembly HS, the signal output end 102 of the first resonance signal return circuit 100 with it is described
The DC_N connection of light current reference ground.
In the present embodiment, a connection heat sink assembly HS and electricity are constructed by the first resonance signal return circuit 100
Resonance interference signal return path between source circuit light current reference ground DC_N, the resonance interference signal on heat sink assembly HS
It is back to power circuit light current reference ground DC_N by the first resonance signal return circuit 100, it is dry to reduce resonance
Leaking for signal is disturbed, the EMC performance of complete machine is improved.
Specifically, a kind of embodiment of the first resonance signal return circuit 100, including the 7th capacitor C7, it is described
One end of 7th capacitor C7 is connect by signal output end 102 with the light current reference ground DC_N, and the other end passes through signal
Input terminal 101 is electrically connected with the heat sink assembly HS.
Since resonance interference signal is high-frequency signal, light current reference ground can be back to by the 7th capacitor C7
DC_N。
Refering to what is shown in Fig. 9, the another embodiment of the first resonance signal return circuit 100, the return branch
104 further include second resistance R2, and the second resistance R2 is series at the place branch road of the 7th capacitor C7, i.e., the described signal input
End 101, second resistance R2, the 7th capacitor C7, signal output end 102, light current reference ground DC_N are sequentially connected.Wherein described
Two resistance R2 are used to weaken the intensity of resonance interference signal on return branch 104.
Specifically, the filter circuit can form filter circuit using filter element or use integrated filter
Part, such as filtering chip, the filter function of the filter circuit, which also can according to need, to be configured, and is implemented for example, by using third
Pi filter structure in example, can effectively inhibit external common mode interference signal and DM EMI signal.
Referring to Fig.1 shown in 0, be the utility model the 9th embodiment, provide reduce electromagnetic interference circuit, including with
In the current supply circuit powered for circuit module, the current supply circuit includes the power supply for converting alternating current to direct current electricity output
Circuit, the power circuit include ac input end and DC output end, the ac input end include firewire input terminal Lin and
Zero curve input terminal Nin, the DC output end include DC power supply terminal p+ and light current reference ground DC_N；
It further include the first resonance signal return circuit 100, the first resonance signal return circuit 100 is exported including signal
End 102 and the signal input part 101 for being electrically connected with heat sink assembly HS, the signal output end 102, which is connected to, powers back
On the road, so that the resonance interference signal on heat sink assembly HS is back to confession by the first resonance signal return circuit 100
Electrical circuit；
It further include the second resonance signal return circuit 200, the input terminal and ground of the second resonance signal return circuit 200
Line PE connection, the output end of the second resonance signal return circuit 200 are connect with the light current reference ground DC_N.Pass through
Second resonance signal return circuit 200 is set, and the common mode interference signal from ground wire PE can pass through second resonance signal
Return circuit 200 is back to the light current reference ground DC_N of power circuit, to reduce leaking for common mode interference signal Icm.
A kind of embodiment of the second resonance signal return circuit 200, including the 9th capacitor C9, the 9th capacitor
One end of C9 is connect with ground wire PE, and the other end is connected to light current reference ground DC_N.Due to the common mode interference signal on ground wire PE
For high-frequency signal, light current reference ground DC_N can be back to by the 9th capacitor C9.
Referring to Fig.1 shown in 0, the another embodiment of the second resonance signal return circuit 200, second resonance signal
Return circuit 200 includes the 9th capacitor C9 and the 4th resistance R4, and one end of the 4th resistance R4 is connect with ground wire PE, the other end
It is connect with the 9th capacitor C9, the 9th capacitor C9 connects relative to the other end and light current reference ground DC_N of the 4th resistance R4
It connects.The 4th resistance R4 can weaken the intensity of common mode interference signal on return branch 104.
The second resonance signal return circuit 200 in the present embodiment also can be applied to above-mentioned second embodiment to
In eight embodiments, it is only necessary to which the second resonance signal return circuit 200 is set to ground wire PE and light current reference ground DC_
Between N.
Be the tenth embodiment of the utility model for example, referring to shown in Figure 11, on the basis of seven embodiments into one
The improved circuit for reducing electromagnetic interference is walked, described second is provided between the ground wire PE and light current reference ground DC_N
Resonance signal return circuit 200, the second resonance signal return circuit 200 is by the 9th capacitor C9 and the 4th resistance R4 series connection group
At.
It is the 11st embodiment of the utility model referring to Fig.1 shown in 2, it is further on the basis of eight embodiments
The improved circuit for reducing electromagnetic interference, it is humorous to be provided with described second between the ground wire PE and light current reference ground DC_N
Shake signal return circuit 200, and the second resonance signal return circuit 200 is by the 9th capacitor C9 and the 4th resistance R4 series connection group
At.
12nd embodiment of the utility model, provides electronic equipment, including circuit module and for being circuit module
The heat sink assembly HS of heat dissipation, further includes the circuit of the low EMI of any of the above-described embodiment, the current supply circuit with it is described
Circuit module connection, the signal input part 101 and heat sink assembly HS of the first resonance signal return circuit 100 are electrically connected
It connects, the signal output end 102 of the first resonance signal return circuit 100 is connect with the current supply circuit.
Specifically, referring to Fig.1 shown in 3, the 13rd embodiment of the utility model provides electronic equipment, including circuit
Module and current supply circuit, the current supply circuit include by common mode inductance L1, first capacitor CY1, the second capacitor CY2, third capacitor
The π shape filter circuit that CY3, the 4th capacitor CY4, the 5th capacitor CX5, the 6th capacitor CX6 are formed, wherein the first capacitor CY1,
Second capacitor CY2 is connected in series in the first output end o1, the second output terminal o2 of the common mode inductance L1.The current supply circuit is also
Including for converting alternating current to the power circuit that direct current is circuit module power supply, the output end of the π shape filter circuit
It is connect with the ac input end of power circuit, the power circuit is defeated from DC output end for converting alternating current to direct current
Out, the DC output end includes DC power supply terminal p+ and light current reference ground DC_N, the DC power supply terminal p+ and light current ginseng
It examines and is connected with bus capacitor C10 between ground terminal DC_N, the DC output end of power circuit is electricity by the bus capacitor C10
Road module provides direct current supply.
The circuit module includes device for power switching, the device for power switching and the thermally conductive company of heat sink assembly HS
It connects.In the present embodiment, the device for power switching includes IGBT switching tube SW, power factor correction module IPM and restores two fastly
Pole pipe D1, one end of the IGBT switching tube SW are connect with the anode of DC power supply terminal p+ and fast recovery diode D1 respectively, institute
The other end for stating IGBT switching tube SW is connect with light current reference ground DC_N, the positive terminal of the power factor correction module IPM
It is connect with the cathode of fast recovery diode D1, the negative pole end of the power factor correction module IPM and the light current are with reference to ground
Hold DC_NL connection.
Since temperature is higher at work for device for power switching, need to radiate to it by heat sink assembly HS, this
It is radiated to above-mentioned device for power switching in embodiment using a heat sink assembly HS, is dissipated to reach good simultaneously
Thermal effect, the IGBT switching tube SW, power factor correction module IPM and fast recovery diode D1 respectively with the radiator
The thermally conductive connection of component HS, such as the device for power switching held against heat sink component HS is installed or passed through Heat Conduction Material for example
Silicone grease carries out thermally conductive connection, guarantees that there is preferable heat to transmit between device for power switching and heat sink assembly HS.
Device for power switching can generate switching signal and harmonic signal at work, and the harmonic signal passes through distribution parameter
It is coupled in heat sink assembly, forms resonance interference signal.As shown in figure 13, between IGBT switching tube SW and heat sink assembly HS
Can exist the first distribution capacity chp1, there are the second distribution capacity between fast recovery diode D1 and heat sink assembly HS
There are third distribution capacity chp3 between chp2, power factor correction module IPM and heat sink assembly HS, device for power switching is produced
Raw harmonic signal can pass through the first above-mentioned distribution capacity chp1, the second distribution capacity chp2 and third distribution capacity chp3
Into in heat sink assembly HS, resonance interference signal is formed.
Above-mentioned device for power switching select according to actual circuit, such as can be IGBT switching tube
More than one combinations of SW, power factor correction module IPM, fast recovery diode D1.
In the present embodiment, it is provided with the first resonance signal return circuit 100, the first resonance signal return circuit 100
Signal input part 101 be electrically connected with the heat sink assembly HS, the signal output end of the first resonance signal return circuit 100
102 are connected on the first node a between first capacitor CY1 described in π shape filter circuit, the second capacitor CY2, heat sink assembly
Resonance interference signal on HS passes through the first resonance signal return circuit 100, first capacitor CY1 and the second capacitor CY2
It is back to the firewire input terminal Lin and zero curve input terminal Nin of power circuit, the reflux of resonance interference signal is realized, reduces humorous
Leaking for vibration interference signal, improves the EMC performance of complete machine.
On the other hand, in order to avoid due to heat sink assembly HS vacantly cause heat sink assembly HS become outside electromagnetic radiation
Heat sink assembly HS is usually connect ground connection with shell metal plate by the antenna of interference signal, and at this moment resonance interference signal can pass through shell
Body metal plate enters ground wire PE and forms common mode interference signal, in the present embodiment, by the ground wire PE and light current reference ground
The second resonance signal return circuit 200 for being composed in series by the 9th capacitor C9, the 4th resistance R4 is set between DC_N, on ground wire PE
Common mode interference signal the light current reference ground DC_N can be back to by the second resonance signal return circuit 200, reduce
Leaking for common mode interference signal, improves the EMC performance of complete machine.
The first resonance signal return circuit 100 needs to be electrically connected with heat sink assembly HS foundation, is just able to achieve resonance
The return of interference signal is a kind of embodiment of heat sink assembly HS referring to Fig.1 shown in 5, and the heat sink assembly HS includes
Radiator body 301 and the refrigerant pipe 304 being set in radiator body 301, the first resonance signal return circuit 100
Signal input part 101 is connect with the radiator body 301, in the present embodiment, the first resonance signal return circuit 100
It is printed in PCB circuit board 400, is provided in the PCB circuit board 400 for connecting the first resonance signal return circuit 100
Pad 305, at this moment pad 305 is equivalent to the signal input part 101 of the first resonance signal return circuit 100, the radiator
Ontology 301 is set in PCB circuit board 400, and the radiator body 301 is fixed on PCB circuit board by screw 500
In pad 305 on 400, and being electrically connected between radiator body 301 and pad 305 is realized by screw 500.It is described to dissipate
Hot device ontology 301 includes pedestal 302 and upper cover 303, and the refrigerant pipe 304 is set on pedestal 302, and will by upper cover 303
The encapsulation of refrigerant pipe 304 is fixed in radiator body 301.
In addition, the first resonance signal return circuit 100 can also be electrically connected with above-mentioned refrigerant pipe 304, such as logical
It crosses wire jumper or adapter ring and realizes and be electrically connected with refrigerant pipe 304.
It is the another embodiment of heat sink assembly HS, different from the embodiment described above, institute referring to Fig.1 shown in 6
Stating heat sink assembly HS is the radiating fin 600 being set in PCB circuit board 400, is arranged in the PCB circuit board 400 useful
In the pad 305 for connecting the first resonance signal return circuit 100, the radiating fin 600 is fixed on by screw 500
In pad 305 in PCB circuit board 400, being electrically connected for radiating fin 600 and the first resonance signal return circuit 100 is realized.
Referring to Fig.1 shown in 4, the 14th embodiment of the utility model provides electronic equipment, the present embodiment and the 13rd
The difference of embodiment is that the first resonance signal return circuit 100 is connected to the heat sink assembly HS and light current ginseng
It examines between ground terminal DC_N, the resonance interference signal from heat sink assembly HS passes through the first resonance signal return circuit
100 are back to the light current reference ground DC_N of power circuit, reduce leaking for resonance interference signal, improve the EMC of complete machine
Performance.
15th embodiment of the utility model, provides air conditioner, including any of the above-described embodiment of the utility model
Reducing the circuit of electromagnetic interference or the electronic equipment of any of the above-described embodiment of the utility model, specific embodiment can refer to
Embodiment is stated, to avoid redundancy, is not being repeated herein.
In the description of this specification, reference term " embodiment ", " another embodiment " or " certain embodiment party
It is practical that the description of formula " etc. means to combine embodiment or example particular features, structures, materials, or characteristics described to be contained in
In at least one novel embodiment or example.In the present specification, schematic expression of the above terms not necessarily refer to
It is identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be at any one
Or it can be combined in any suitable manner in multiple embodiments or example.
While there has been shown and described that the embodiments of the present invention, those skilled in the art can manage
Solution: a variety of to the progress of these embodiments can change in the case where not departing from the principles of the present invention and objective, modify,
Replacement and variant, the scope of the utility model are defined by the claims and their equivalents.
Claims (17)
1. reducing the circuit of electromagnetic interference characterized by comprising
Current supply circuit, for powering for circuit module；
First resonance signal return circuit, the signal input part including signal output end and for being electrically connected with heat sink assembly,
The signal output end is connected on current supply circuit, so that the resonance interference signal on heat sink assembly passes through first resonance
Signal return circuit is back to current supply circuit.
2. the circuit according to claim 1 for reducing electromagnetic interference, which is characterized in that the current supply circuit includes:
Power circuit, for converting alternating current to direct current electricity output, the power circuit includes that ac input end and direct current are defeated
Outlet, the ac input end include firewire input terminal and zero curve input terminal, the DC output end include DC power supply terminal and
Light current reference ground；
It further include first capacitor and the second capacitor, the signal output end of the first resonance signal return circuit passes through described first
Capacitor is connect with the firewire input terminal, and the signal output end of the first resonance signal return circuit passes through second capacitor
It is connect with the zero curve input terminal.
3. the circuit according to claim 2 for reducing electromagnetic interference, which is characterized in that the first capacitor and the second capacitor
It is Y capacitance.
4. the circuit according to claim 2 for reducing electromagnetic interference, which is characterized in that the current supply circuit further includes filtering
Circuit, the input terminal connection exchange firewire and AC neutral line of the filter circuit, output end and the power supply electricity of the filter circuit
The ac input end on road connects, and the first capacitor and the second capacitor connect and be connected to the output end of filter circuit, and described first
The signal output end of resonance signal return circuit is connected on the node between the first capacitor and the second capacitor.
5. the circuit according to claim 2 for reducing electromagnetic interference, which is characterized in that the current supply circuit further include:
Common mode inductance, the common mode inductance include the first input end for connecting with firewire and second for connecting with zero curve
Input terminal, the common mode inductance further include the first output end and second output terminal, and first output end and second output terminal are divided
It is not connect with the firewire input terminal of power circuit and zero curve input terminal；
The first capacitor, the second capacitor are connected in series between the first output end of the common mode inductance and second output terminal,
First node, the signal of the first resonance signal return circuit are provided between the concatenated first capacitor and the second capacitor
Output end is connected on the first node, further includes connecting branch over the ground, and the first node by connecting branch over the ground
It is connect with ground wire.
6. the circuit according to claim 5 for reducing electromagnetic interference, which is characterized in that further include third capacitor and the 4th electricity
Holding, the third capacitor and the 4th capacitor are connected in series between the first input end of the common mode inductance and the second input terminal,
Second node, the second node and the connection branch over the ground are provided between the concatenated third capacitor and the 4th capacitor
Road connection.
7. the circuit according to claim 6 for reducing electromagnetic interference, which is characterized in that the first node and described second
The branch of connection over the ground road between node is provided with the first resistor for weakening resonance signal.
8. the circuit according to claim 7 for reducing electromagnetic interference, which is characterized in that the resistance value of the first resistor is less than
50 ohm.
9. the circuit according to claim 5 for reducing electromagnetic interference, which is characterized in that first resonance signal returns to electricity
Road further includes return branch, and the signal input part of one end of the return branch and the first resonance signal return circuit connects
It connects, the other end is connect with the light current reference ground.
10. the circuit according to claim 1 for reducing electromagnetic interference, which is characterized in that the current supply circuit includes:
Power circuit, for converting alternating current to direct current electricity output, the power circuit includes that ac input end and direct current are defeated
Outlet, the DC output end include DC power supply terminal and light current reference ground；
The signal output end of the first resonance signal return circuit is connect with the light current reference ground.
11. the circuit according to claim 10 for reducing electromagnetic interference, which is characterized in that first resonance signal returns
Circuit includes the 7th capacitor, the both ends of the 7th capacitor signal input part with the first resonance signal return circuit respectively
It is connected with signal output end.
12. the circuit according to claim 11 for reducing electromagnetic interference, which is characterized in that first resonance signal returns
Circuit further includes second resistance, and the second resistance is series at the place branch road of the 7th capacitor.
13. according to the circuit of any reduction electromagnetic interference of claim 2 to 12, which is characterized in that further include second humorous
Shake signal return circuit, and the input terminal of the second resonance signal return circuit is connect with ground wire, and second resonance signal returns
The output end on telegram in reply road is connect with the light current reference ground.
14. electronic equipment, it is characterised in that: the heat sink assembly including circuit module and for radiating for circuit module also wraps
The circuit of the low EMI as described in claim 1 to 13 is any is included, the current supply circuit is connect with the circuit module, institute
The signal input part for stating the first resonance signal return circuit is electrically connected with the heat sink assembly, and first resonance signal returns
The signal output end of circuit is connect with the current supply circuit.
15. electronic equipment according to claim 14, it is characterised in that: the heat sink assembly include radiator body and
The refrigerant pipe being set in radiator body, the signal input part of the first resonance signal return circuit and the radiator sheet
Body or refrigerant pipe electrical connection.
16. electronic equipment according to claim 14 or 15, it is characterised in that: the circuit module includes power switch device
Part, the device for power switching and the thermally conductive connection of the heat sink assembly.
17. air conditioner, it is characterised in that: circuit or packet including the reduction electromagnetic interference as described in claim 1 to 13 is any
Include the electronic equipment as described in claim 14 to 16 is any.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920285888.6U CN209488450U (en) | 2019-03-06 | 2019-03-06 | Reduce circuit, electronic equipment and the air conditioner of electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920285888.6U CN209488450U (en) | 2019-03-06 | 2019-03-06 | Reduce circuit, electronic equipment and the air conditioner of electromagnetic interference |
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| Publication Number | Publication Date |
|---|---|
| CN209488450U true CN209488450U (en) | 2019-10-11 |
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ID=68134232
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920285888.6U Active CN209488450U (en) | 2019-03-06 | 2019-03-06 | Reduce circuit, electronic equipment and the air conditioner of electromagnetic interference |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398727A (en) * | 2020-05-11 | 2020-07-10 | 珠海拓芯科技有限公司 | Noise filtering equipment and electromagnetic compatibility test system |
| CN113347778A (en) * | 2021-05-31 | 2021-09-03 | 西安联飞智能装备研究院有限责任公司 | Printed circuit board and method for connecting common mode capacitor and switching device radiator |
| WO2023044848A1 (en) * | 2021-09-26 | 2023-03-30 | 宁德时代新能源科技股份有限公司 | Switching circuit and power supply device |
| WO2024141275A1 (en) * | 2022-12-27 | 2024-07-04 | Asml Netherlands B.V. | System, methods, and apparatuses with reduced noise current |
-
2019
- 2019-03-06 CN CN201920285888.6U patent/CN209488450U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398727A (en) * | 2020-05-11 | 2020-07-10 | 珠海拓芯科技有限公司 | Noise filtering equipment and electromagnetic compatibility test system |
| CN111398727B (en) * | 2020-05-11 | 2022-04-19 | 珠海拓芯科技有限公司 | Noise filtering equipment and electromagnetic compatibility test system |
| CN113347778A (en) * | 2021-05-31 | 2021-09-03 | 西安联飞智能装备研究院有限责任公司 | Printed circuit board and method for connecting common mode capacitor and switching device radiator |
| CN113347778B (en) * | 2021-05-31 | 2023-02-28 | 西安联飞智能装备研究院有限责任公司 | Printed circuit board and method for connecting common mode capacitor and switching device radiator |
| WO2023044848A1 (en) * | 2021-09-26 | 2023-03-30 | 宁德时代新能源科技股份有限公司 | Switching circuit and power supply device |
| WO2024141275A1 (en) * | 2022-12-27 | 2024-07-04 | Asml Netherlands B.V. | System, methods, and apparatuses with reduced noise current |
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