CN208272852U - EMC filter circuit, Switching Power Supply and cooking equipment - Google Patents
EMC filter circuit, Switching Power Supply and cooking equipment Download PDFInfo
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- CN208272852U CN208272852U CN201820942355.6U CN201820942355U CN208272852U CN 208272852 U CN208272852 U CN 208272852U CN 201820942355 U CN201820942355 U CN 201820942355U CN 208272852 U CN208272852 U CN 208272852U
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Abstract
The utility model provides a kind of EMC filter circuit, comprising: first capacitor device and the second capacitor；Inductor, the first end of inductor are connected to the first end of first capacitor device, and the second end of inductor is connected to the first end of the second capacitor；High frequency filter element, the first end of High frequency filter element are connected to the second end of first capacitor device, and the second end of High frequency filter element is connected to the second end of the second capacitor；Filter resistance, it is in parallel with inductor.It correspondingly also proposed Switching Power Supply and cooking equipment.The technical solution of the utility model, pass through setting High frequency filter element and the inductor and filter resistance that are connected in parallel, the level of inductor is caused to generate shake when can solve the problems, such as that High frequency filter element filters out hf interference current while effectively guaranteeing filter effect, to effectively guarantee the Electro Magnetic Compatibility of rear end electrical equipment.
Description
Technical field
The utility model relates to electronic circuit technology fields, in particular to EMC filter circuit, Switching Power Supply and cook
It prepares food equipment.
Background technique
Under normal circumstances, the output voltage of rectification circuit is not pure direct current, and is differed greatly with direct current, in waveform
Containing biggish ripple component, and in order to obtain more satisfactory DC voltage need filter circuit filter out rectification circuit output
Ripple component in voltage can be produced in certain frequency ranges because of resonance while filter circuit filtering with obtaining DC voltage
Raw higher resonance peak, to reduce the Electro Magnetic Compatibility of household electrical appliance, therefore EMC (Electro Magnetic
Compatibility, electromagnetic compatibility) filter circuit is while guaranteeing filter effect, it is also necessary to improve the electromagnetic compatibility of product
Design performance.
Utility model content
The utility model aims to solve at least one of technical problems existing in the prior art or related technologies.
For this purpose, passing through setting High frequency filter element and parallel connection the utility model proposes a kind of new EMC filter circuit
The inductor and filter resistance of connection can solve High frequency filter element while effectively guaranteeing filter effect and filter out high frequency
The level of inductor is caused to lead to the problem of shake when interference electric current, to effectively guarantee the electromagnetic compatibility of rear end electrical equipment
Performance.
The other purposes of the utility model are that correspondence proposes Switching Power Supply and cooking equipment.
It is according to the present utility model in a first aspect, proposing a kind of EMC filter circuit, comprising: first capacitor device and second
Capacitor；Inductor, the first end of inductor are connected to the first end of first capacitor device, and the second end of inductor is connected to second
The first end of capacitor；High frequency filter element, the first end of High frequency filter element are connected to the second end of first capacitor device, high frequency
The second end of filter element is connected to the second end of the second capacitor；Filter resistance, it is in parallel with inductor.
In the technical scheme, the first capacitor device and the second capacitor being connected in parallel are provided in EMC filter circuit, with
The low-frequency disturbance electric current adulterated in the DC current for flow through EMC filter circuit is filtered out by first capacitor device and the second capacitor,
Between the first end of first capacitor device and the first end of the second capacitor inductor is connected simultaneously, i.e., in first capacitor device and the
Series connected inductor between two capacitors, and then to enhance the filter effect of EMC filter circuit, it is known that, first capacitor
Device, the second capacitor and inductor are used to the low-frequency disturbance electric current in filtering circuit, and EMC filter circuit rear end electrical equipment
In movement, medium-high frequency interference electric current can be generated, it can be by the second end of first capacitor device and the second electricity in this programme
The mode that High frequency filter element is connected between the second end of container reaches the High-frequency Interference electricity for filtering out and flowing through in EMC filter circuit
The purpose of stream, and the intermediate frequency interference electric current of EMC filter circuit can be absorbed by the inductor that is connected in parallel and filter resistance,
Filter resistance can also efficiently solve the level for leading to inductor when High frequency filter element filters out hf interference current simultaneously
Shake is led to the problem of, so as to effectively improve the Electro Magnetic Compatibility of rear end electrical equipment.
In addition, the EMC filter circuit in above-described embodiment provided by the utility model can also have following technical characteristic:
In the above-mentioned technical solutions, it is preferable that High frequency filter element is magnetic bead.
In the technical scheme, it is known that, the resistance value of magnetic bead can change with the variation of power frequency, work as electric current
When frequency is high frequency, the resistance value of magnetic bead can also be increased, therefore when hf interference current flows through EMC filter circuit, and magnetic bead can be in
It is now high impedance status, converts thermal energy for hf interference current, and then achieve the purpose that filter out hf interference current.
In any of the above-described technical solution, it is preferable that High frequency filter element is ferrite bean or punching magnetic bead.
In any of the above-described technical solution, it is preferable that inductor is energy storage inductor device.
In the technical scheme, inductor can be energy storage inductor device, when low-frequency disturbance electric current flows through EMC filtered electrical
Lu Shi, energy storage inductor device, which can absorb low-frequency disturbance electric current and be converted into magnetic energy, to be stored in the energy storage inductor device, into
And achieve the purpose that filter out low-frequency disturbance electric current.
In any of the above-described technical solution, it is preferable that inductor is colour loop inductance device, I-shaped inductor, hollow inductor
Or rod type inductor.
In any of the above-described technical solution, it is preferable that the first end pole of the first end of first capacitor device and the second capacitor
Property is identical, and the second end of the second capacitor is identical with the second end polarity of the second capacitor.
In the technical scheme, it in order to guarantee the filter effect of EMC filter circuit, needs inductor and filtered electrical respectively
The parallel combination and High frequency filter element of resistance are placed in the opposed polarity end of capacitor, that is to say, that or High frequency filter is first
Part is connected between the cathode of first capacitor device and the cathode of the second capacitor and by the parallel combination of inductor and filter resistance
It is connected between the anode of first capacitor device and the anode of the second capacitor, or conversely, High frequency filter element is connected to
First is connected between the anode of one capacitor and the anode of the second capacitor and by the parallel combination of inductor and filter resistance
Between the cathode of capacitor and the cathode of the second capacitor, so that the layout of EMC filter circuit has diversity.
In any of the above-described technical solution, it is preferable that first capacitor device and the second capacitor are electrolytic capacitor.
In the technical scheme, it is known that, the capacitance of the electrolytic capacitor of unit volume is big, therefore can absorb more
Low-frequency disturbance electric current, and then can effectively guarantee to filter out the stability of low-frequency disturbance electric current, and the cost of electrolytic capacitor
It is lower, therefore the production cost of EMC filter circuit can be reduced.
In any of the above-described technical solution, it is preferable that the first end of the first end and first capacitor device of inductor it is public
Hold the first input end as EMC filter circuit；The second end of the first end and first capacitor device of High frequency filter element it is public
Hold the second input terminal as EMC filter circuit；The common end conduct of the second end of inductor and the first end of the second capacitor
First output end of EMC filter circuit；The common end conduct of the second end of High frequency filter element and the second end of the second capacitor
The second output terminal of EMC filter circuit.
It in the technical scheme, being capable of more convenient height by the setting of input terminal and output end to EMC filter circuit
Effect ground is accessed in circuit, equipment for needing to be filtered etc..
Second aspect according to the present utility model provides a kind of Switching Power Supply, including rectification module, switch power module
With EMC filter circuit described in any of the above-described technical solution, wherein the first output end and second output terminal of rectification module are distinguished
It is correspondingly connected to the first input end and the second input terminal of EMC filter circuit, the first output end of EMC filter circuit and second defeated
Enter end to be connected respectively to the first input end of switch power module and the second input terminal.
In the technical scheme, the alternating current of input can be converted to direct current by rectification module, so that rear end electricity consumption is set
It is standby to use, it may include half-wave rectifying circuit, full-wave rectifying circuit or bridge rectifier etc. certainly, in rectification module, specifically
Ground, after alternating current rectified module, output direct current can there are pulsation, it is straight that direct current at this time is referred to as pulsation
Galvanic electricity, and rear end equipment needs smooth direct current, therefore, is connected with EMC filter circuit in the output end of rectification circuit, it should
EMC filter circuit is filtered the Rectified alternating current of input, and then the direct current of output smoothing, while can guarantee
The Electro Magnetic Compatibility of rear end electrical equipment, while it being connected with switch power module in the output end of EMC filter circuit, it will
The high voltage direct current of EMC filter circuit output is converted to low-voltage DC, it is to be understood that switch power module can basis
The voltage value of direct current needed for rear end equipment and configured accordingly, and then meet the practical power demand of rear end equipment,
It keeps operating normally.
The third aspect according to the present utility model provides a kind of cooking equipment, the skill including second aspect as above
The Switching Power Supply of art scheme.
Optionally, the cooking equipment is electric pressure cooking saucepan, electric cooker or electric steam furnace.
The additional aspect and advantage of the utility model will be set forth in part in the description, partially will be from following description
In become obvious, or recognized by the practice of the utility model.
Detailed description of the invention
The above-mentioned and/or additional aspect and advantage of the utility model from the description of the embodiment in conjunction with the following figures will
Become obvious and be readily appreciated that, in which:
Fig. 1 shows the schematic illustration of the EMC filter circuit of the utility model first embodiment；
Fig. 2 shows the schematic illustrations of the EMC filter circuit of the utility model second embodiment；
Fig. 3 shows the composition block diagram of the Switching Power Supply of the utility model embodiment.
Specific embodiment
In order to be more clearly understood that the above objects, features, and advantages of the utility model, with reference to the accompanying drawing and have
The utility model is further described in detail in body embodiment.It should be noted that in the absence of conflict, this Shen
The feature in embodiment and embodiment please can be combined with each other.
Many details are explained in the following description in order to fully understand the utility model, still, this is practical
Novel to be implemented using other than the one described here other modes, therefore, the protection scope of the utility model is simultaneously
It is not limited by the specific embodiments disclosed below.
It is described in detail below with reference to EMC filter circuit of the Fig. 1 and Fig. 2 to the utility model.
As depicted in figs. 1 and 2, the EMC filter circuit 10 of embodiment according to the present utility model, including first capacitor device
100, the second capacitor 102, inductor 104, High frequency filter element 106 and filter resistance 108.
Wherein, the first end of inductor 104 is connected to the first end of first capacitor device 100, the second end of inductor 104
It is connected to the first end of the second capacitor 102；The first end of High frequency filter element 106 is connected to the second of first capacitor device 100
End, the second end of High frequency filter element 106 are connected to the second end of the second capacitor 102；Filter resistance 108 and inductor 104
It is in parallel.
In this embodiment, the first capacitor device 100 and the second capacitor being connected in parallel are provided in EMC filter circuit 10
Device 102, to filter out in the DC current for flowing through EMC filter circuit 10 and adulterate by first capacitor device 100 and the second capacitor 102
Low-frequency disturbance electric current, while connecting inductance between the first end of first capacitor device 100 and the first end of the second capacitor 102
Device 104, i.e., the series connected inductor 104 between first capacitor device 100 and the second capacitor 102, and then to enhance EMC filter
The filter effect of wave circuit 10, it is known that, first capacitor device 100, the second capacitor 102 and inductor 104 are used to filter out
Low-frequency disturbance electric current in circuit, and 10 rear end electrical equipment of EMC filter circuit can generate medium-high frequency interference electricity in movement
Stream, in the present embodiment can be by connecting between the second end of first capacitor device 100 and the second end of the second capacitor 102
The mode of High frequency filter element 106 reaches the hf interference current for filtering out and flowing through EMC filter circuit 10, and can pass through parallel connection
The inductor 104 and filter resistance 108 of connection absorb the intermediate frequency interference electric current in EMC filter circuit 10, while filter resistance
108 can also efficiently solve the level of inductor 104 is caused to generate when High frequency filter element 106 filters out hf interference current
The problem of shake, so as to effectively improve the Electro Magnetic Compatibility of rear end electrical equipment.
Further, in the above-described embodiments, High frequency filter element 106 is magnetic bead.
In this embodiment, it is known that, the resistance value of magnetic bead can change with the variation of power frequency, when electric current frequency
When rate is high frequency, the resistance value of magnetic bead can also be increased, therefore when hf interference current flows through EMC filter circuit 10, and magnetic bead can be in
It is now high impedance status, converts thermal energy for hf interference current, and then achieve the purpose that filter out hf interference current.
Preferably, magnetic bead is ferrite bean or punching magnetic bead.
Further, in the above-described embodiments, inductor 104 is energy storage inductor device.
In this embodiment, inductor 104 can be energy storage inductor device, when low-frequency disturbance electric current flows through EMC filtered electrical
When road 10, energy storage inductor device, which can absorb low-frequency disturbance electric current and be converted into magnetic energy, to be stored in the energy storage inductor device,
And then achieve the purpose that filter out low-frequency disturbance electric current.
Preferably energy storage inductor device is colour loop inductance device, I-shaped inductor, hollow inductor or rod type inductor.
Further, in any of the above-described embodiment, the of the first end of first capacitor device 100 and the second capacitor 102
One end polarity is identical, and the second end of the second capacitor 102 is identical with the second end polarity of the second capacitor 102.
In this embodiment, it is known that, in order to guarantee the filter effect of EMC filter circuit 10, need inductance respectively
The parallel combination and High frequency filter element 106 of device 104 and filter resistance 108 are placed in the opposed polarity end of capacitor, that is,
It says, or High frequency filter element 106 is connected between the cathode of first capacitor device 100 and the cathode of the second capacitor 102 simultaneously
The parallel combination of inductor 104 and filter resistance 108 is connected to the anode and the second capacitor 102 of first capacitor device 100
It is specific as shown in Figure 1 between anode；Or conversely, by High frequency filter element 106 be connected to first capacitor device 100 anode and
First capacitor device is connected between the anode of second capacitor 102 and by the parallel combination of inductor 104 and filter resistance 108
Between 100 cathode and the cathode of the second capacitor 102, specifically as shown in Fig. 2, so that the layout of EMC filter circuit 10
Has diversity.
Further, in any of the above-described embodiment, first capacitor device 100 and the second capacitor 102 are electrolytic capacitor.
In this embodiment, it is known that, the capacitance of the electrolytic capacitor of unit volume is big, therefore can absorb more
Low-frequency disturbance electric current, and then can effectively guarantee to filter out the stability of low-frequency disturbance electric current, and the cost of electrolytic capacitor compared with
It is low, therefore the production cost of EMC filter circuit 10 can be reduced.
Further, in any of the above-described embodiment, the first end of inductor 104 and the first end of first capacitor device 100
First input end of the common end as EMC filter circuit 10；The first end and first capacitor device 100 of High frequency filter element 106
Second end second input terminal of the common end as EMC filter circuit 10；The second end of inductor 104 and the second capacitor
First output end of the common end of 102 first end as EMC filter circuit 10；The second end of High frequency filter element 106 and
Second output terminal of the common end of the second end of two capacitors 102 as EMC filter circuit 10.
It in the technical scheme, can be more convenient by the setting of input terminal and output end to EMC filter circuit 10
It is efficiently accessed in circuit, equipment for needing to be filtered etc..
It is understood that the value of the electronic components such as Fig. 1 and capacitor shown in Fig. 2, inductor, resistance can be with
It is set according to the concrete conditions such as application product and actual use scene.
It is described in detail below with reference to Switching Power Supply of the Fig. 3 to the utility model embodiment.
As shown in figure 3, according to the Switching Power Supply of the utility model embodiment, including rectification module 20, switch power module
30 and any of the above-described embodiment described in EMC filter circuit 10.
Wherein, the first output end of rectification module 20 and second output terminal are connected respectively to EMC filter circuit 10
First input end and the second input terminal, the first output end and the second input terminal of EMC filter circuit 10 are connected respectively to opening
The first input end and the second input terminal of powered-down source module 30.
In this embodiment, the alternating current of input can be converted to direct current by rectification module 20, so that rear end equipment makes
With, certainly, it may include half-wave rectifying circuit, full-wave rectifying circuit or bridge rectifier etc. in rectification module 20, specifically,
Behind alternating current rectified module 20, output direct current can there are pulsation, it is straight that direct current at this time is referred to as pulsation
Galvanic electricity, and rear end equipment needs smooth direct current, therefore, is connected with EMC filter circuit 10 in the output end of rectification circuit, it should
The Rectified alternating current of 10 pairs of EMC filter circuit inputs is filtered, and then the direct current of output smoothing, while can be guaranteed
The Electro Magnetic Compatibility of rear end electrical equipment, while it being connected with switch power module 30 in the output end of EMC filter circuit 10, with
The high voltage direct current that EMC filter circuit 10 exports is converted into low-voltage DC, it is to be understood that switch power module 30 can
It is configured accordingly with the voltage value of the direct current according to needed for rear end equipment, and then meets the practical electricity consumption of rear end equipment
Demand keeps operating normally.
One embodiment as the utility model, it is also proposed that in a kind of cooking equipment, including any of the above-described embodiment
The Switching Power Supply.
Optionally, the cooking equipment is electric pressure cooking saucepan, electric cooker or electric steam furnace.
The technical solution of the utility model is had been described in detail above with reference to the accompanying drawings, which passes through in EMC filtered electrical
The inductor and filter resistance that High frequency filter element is arranged in road and is connected in parallel can effectively guarantee filter effect
Solve the problems, such as to cause when High frequency filter element filters out hf interference current the level of inductor to generate shake simultaneously, thus effectively
The Electro Magnetic Compatibility of ground guarantee rear end electrical equipment；Further, the topological structure of good EMC filter circuit not only helps
In improving EMC filter effect, can also play a role in improving to the complete machine appearance of product, cost and layout.
In the present invention, term " first ", " second " are only used for the purpose of description, and should not be understood as instruction or dark
Show relative importance；Term " multiple " then refers to two or more, unless otherwise restricted clearly.Term " installation ", " phase
Even ", the terms such as " connection ", " fixation " shall be understood in a broad sense, for example, " connection " may be a fixed connection, be also possible to removable
Connection is unloaded, or is integrally connected；" connected " can be directly connected, can also be indirectly connected through an intermediary.For ability
For the those of ordinary skill in domain, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the description of the utility model, it is to be understood that the orientation or positional relationship of the instructions such as term " on ", "lower" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, rather than indicate
Or imply that signified device or unit must have specific direction, be constructed and operated in a specific orientation, it is thus impossible to understand
For limitations of the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least the one of the utility model
In a embodiment or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment
Or example.Moreover, the particular features, structures, materials, or characteristics of description can be in any one or more embodiment or examples
In can be combined in any suitable manner.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of EMC filter circuit characterized by comprising
First capacitor device and the second capacitor；
Inductor, the first end of the inductor are connected to the first end of the first capacitor device, the second end of the inductor
It is connected to the first end of second capacitor；
High frequency filter element, the first end of the High frequency filter element are connected to the second end of the first capacitor device, the height
The second end of frequency filter element is connected to the second end of second capacitor；
Filter resistance, it is in parallel with the inductor.
2. EMC filter circuit according to claim 1, which is characterized in that the High frequency filter element is magnetic bead.
3. EMC filter circuit according to claim 2, which is characterized in that the High frequency filter element is ferrite bean
Or punching magnetic bead.
4. EMC filter circuit according to claim 2, which is characterized in that the inductor is energy storage inductor device.
5. EMC filter circuit according to claim 4, which is characterized in that the inductor is colour loop inductance device, I-shaped electricity
Sensor, hollow inductor or rod type inductor.
6. EMC filter circuit according to any one of claim 1 to 5, which is characterized in that the of the first capacitor device
One end is identical as the first end polarity of second capacitor, the second end of second capacitor and second capacitor
Second end polarity is identical.
7. EMC filter circuit according to claim 6, which is characterized in that the first capacitor device and second capacitor
Device is electrolytic capacitor.
8. EMC filter circuit according to any one of claim 1 to 5, which is characterized in that
The common end of the first end of the inductor and the first end of the first capacitor device as the EMC filter circuit
One input terminal；
The common end of the first end of the High frequency filter element and the second end of the first capacitor device is as the EMC filtered electrical
Second input terminal on road；
The common end of the second end of the inductor and the first end of second capacitor as the EMC filter circuit
One output end；
The common end of the second end of the High frequency filter element and the second end of second capacitor is as the EMC filtered electrical
The second output terminal on road.
9. a kind of Switching Power Supply characterized by comprising rectification module, switch power module and as power require it is any in 1 to 8
EMC filter circuit described in,
Wherein, the first output end of the rectification module and second output terminal are connected respectively to the EMC filter circuit
First input end and the second input terminal, the first output end and the second input terminal of the EMC filter circuit be connected respectively to
The first input end of the switch power module and the second input terminal.
10. a kind of cooking equipment, which is characterized in that including Switching Power Supply as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820942355.6U CN208272852U (en) | 2018-06-19 | 2018-06-19 | EMC filter circuit, Switching Power Supply and cooking equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820942355.6U CN208272852U (en) | 2018-06-19 | 2018-06-19 | EMC filter circuit, Switching Power Supply and cooking equipment |
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| Publication Number | Publication Date |
|---|---|
| CN208272852U true CN208272852U (en) | 2018-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820942355.6U Active CN208272852U (en) | 2018-06-19 | 2018-06-19 | EMC filter circuit, Switching Power Supply and cooking equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431502A (en) * | 2020-03-31 | 2020-07-17 | 四川九八村信息科技有限公司 | System and method for electromagnetic compatibility prevention and control of analog signals |
| CN114257079A (en) * | 2021-12-23 | 2022-03-29 | 无锡睿勤科技有限公司 | Power utilization equipment and power supply system |
-
2018
- 2018-06-19 CN CN201820942355.6U patent/CN208272852U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431502A (en) * | 2020-03-31 | 2020-07-17 | 四川九八村信息科技有限公司 | System and method for electromagnetic compatibility prevention and control of analog signals |
| CN114257079A (en) * | 2021-12-23 | 2022-03-29 | 无锡睿勤科技有限公司 | Power utilization equipment and power supply system |
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