CN208174533U - Electromagnetic compatibility filter circuit, DC power supply and household electrical appliance - Google Patents
Electromagnetic compatibility filter circuit, DC power supply and household electrical appliance Download PDFInfo
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- CN208174533U CN208174533U CN201820880495.5U CN201820880495U CN208174533U CN 208174533 U CN208174533 U CN 208174533U CN 201820880495 U CN201820880495 U CN 201820880495U CN 208174533 U CN208174533 U CN 208174533U
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Abstract
The utility model embodiment provides a kind of electromagnetic compatibility filter circuit, DC power supply and household electrical appliance, belongs to conduction interference and inhibits field.The electromagnetic compatibility filter circuit includes the first low pass LC filter, the second low pass LC filter and common mode inductance, wherein the input side both ends of the common mode inductance bridge the power firestreak interface and the zero-power line interface respectively；First low pass LC filter includes the first capacitor for bridging the outlet side both ends of the common mode inductance, the second capacitor of the exchange firewire input terminal of the bridging rectifier bridge and AC neutral line input terminal and the first inductance being connected between the first capacitor and second capacitor；The input terminal of second low pass LC filter bridges the direct-flow positive pole and direct current cathode of the rectifier bridge, and output end is for connecting load.As a result, by three-level Federated filter, conduction interference phenomenon is effectively inhibited, EMI surplus of the household appliances under high-power electromagnetic heating mode can be greatly improved.
Description
Technical field
The utility model relates to conduction interferences to inhibit field, more particularly to a kind of electromagnetic compatibility filter circuit, direct current
Source and household electrical appliance.
Background technique
During household appliances operation, interference signal can be externally generated, this phenomenon is referred to as conduction interference, phase
The problem of Ying Di, industry can solve general conduction interference using traditional em filtering circuit at present.
With the continuous innovation of household appliances, IH (induction heat, electromagnetic heating) product, such as electromagnetic oven etc.,
Receive wideling popularize for industry and being widely recognized as user.But present inventor is during practicing the application
It was found that：Electromagnetic heating IH product in the prior art is because of its special IH operating mode, so that electromagnetic coil frequency of oscillation works
Signal is very strong, which can be transferred to power grid, other electrical equipments on severe jamming to power grid along power supply line.And
And because of power increase under IH operating mode after, traditional em filtering circuit is difficult to be effectively treated present in IH product power port
The conduction interference the problem of, cause dominant frequency and its harmonic excess or EMI (Electromagnetic Interference,
Electromagnetic interference) surplus deficiency.
Utility model content
The purpose of the utility model embodiment is to provide a kind of electromagnetic compatibility filter circuit, direct current for DC power supply
Source and household electrical appliance, to caused serious when at least solving that household appliances work under high-power IH mode in the prior art
Conduction interference the problem of.
To achieve the goals above, the utility model embodiment provides a kind of electromagnetic compatibility filtered electrical for DC power supply
Road, DC power supply include power firestreak interface, zero-power line interface and rectifier bridge, which includes first low
Logical LC filter, the second low pass LC filter and common mode inductance, wherein：The input side both ends of the common mode inductance bridge institute respectively
State power firestreak interface and the zero-power line interface；First low pass LC filter includes bridge the common mode inductance defeated
Out the first capacitor at side both ends, the exchange firewire input terminal of the bridging rectifier bridge and AC neutral line input terminal the second capacitor,
And it is connected on the first inductance between the first capacitor and second capacitor；The input of second low pass LC filter
End bridges the direct-flow positive pole and direct current cathode of the rectifier bridge, and output end is for connecting load.
Optionally, second low pass LC filter includes third capacitor, the 4th capacitor and the second inductance, wherein：It is described
The both ends of third capacitor bridge the direct-flow positive pole and the direct current cathode of the rectifier bridge；4th capacitor is connected in parallel to institute
Third capacitor is stated, and its both ends is for bridging the load；And second inductance be connected in series in second capacitor and
Between the third capacitor.
Optionally, first inductance is connected on the exchange firewire input of rectifier bridge described in second capacitance connection
Between the one end at end and the first capacitor.
Optionally, first inductance is connected on the AC neutral line input of rectifier bridge described in second capacitance connection
Between the one end at end and the first capacitor.
Optionally, second inductance is connected on the one of the direct current cathode of rectifier bridge described in the third capacitance connection
Between end and the 4th capacitor.
Optionally, second inductance is connected on the one of the direct-flow positive pole of rectifier bridge described in the third capacitance connection
Between end and the 4th capacitor.
Optionally, first inductance, second inductance and the common mode inductance are filter inductance, and the filtering
Inductance includes one or more of the following：Ferrocart core material inductance, amorphous material inductance and alloy core material inductance.
On the other hand the utility model embodiment provides a kind of DC power supply, including：The above-mentioned electricity for DC power supply
Magnetic is compatible with filter circuit；Power firestreak interface and zero-power line interface；Rectifier bridge is configured with ac input end and direct current output
End, the alternating current for being inputted ac input end are converted to direct current and export through the DC output end.
The another aspect of the utility model embodiment provides a kind of household electrical appliance, including：Load；And above-mentioned direct current
Source, for the power supply for the load.
Optionally, the load includes electromagnetic heating induction coil disk, wherein the household electrical appliance further include：Driving dress
It sets, is used for output drive signal；IGBT is connected to the electromagnetic heating induction coil disk, the DC power supply and the drive
Dynamic device, and for controlling the electromagnetic heating induction coil disk heating according to the driving signal.
Through the above technical solutions, the first low pass LC filter and of Π type structure is respectively set in the two sides of rectifier bridge
Two low pass LC filters, and common mode inductance is bridged between the power interface for connecting AC power source, hereby it is achieved that rectification
DM EMI signal in the low pass LC filter collective effect filtering circuit of bridge two sides, and common mode inductance is combined to eliminate in circuit
Common-mode signal, three-level Federated filter effectively inhibits conduction interference phenomenon, household appliances can be greatly improved high-power
EMI surplus under electromagnetic heating mode.
The other feature and advantage of the utility model embodiment will give in the following detailed description section specifically
It is bright.
Detailed description of the invention
Attached drawing is to further understand for providing to the utility model embodiment, and constitute part of specification,
It is used to explain the utility model embodiment together with following specific embodiment, but does not constitute to the utility model embodiment
Limitation.In the accompanying drawings：
Fig. 1 is the circuit connection diagram of the DC power supply of an embodiment of the present invention；
Fig. 2 is the circuit connection diagram of the DC power supply of an embodiment of the present invention；
Fig. 3 is the structural block diagram of the electromagnetic heating type household electrical appliance of an embodiment of the present invention；
Fig. 4 is the circuit connection diagram of the DC power supply of an embodiment of the present invention.
Description of symbols
1 DC power supply, 101 first low-pass filter
102 second low-pass filter U rectifier bridges
ACL power firestreak interface ACN zero-power line interface
C1 first capacitor the second capacitor of C2
The 4th capacitor of C3 third capacitor C4
L1 the first inductance the second inductance of L2
11 electrically-heated coil disk of L3 common mode capacitance
3 electromagnetic heating type household electrical appliance H electromagnetic heating induction coil disks
32 IGBT, 31 driving device
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the utility model embodiment.It should be understood that
It is that specific embodiment described herein is merely to illustrate and explains the utility model embodiment is not limited to this reality
Use new embodiment.
As shown in Figure 1, the DC power supply 1 of an embodiment of the present invention, including power firestreak interface-ACL, zero-power line
Interface ACN, rectifier bridge U and electromagnetic compatibility filter circuit (not shown), the electromagnetic compatibility filter circuit are filtered including the first low pass LC
Wave device 101, the second low pass LC filter 102 and common mode inductance L3, wherein power firestreak interface-ACL is for connecting AC power source fire
Line, zero-power line interface ACN is for connecting AC power source zero curve, friendship of the rectifier bridge U for realizing rectification function will be inputted
Galvanic electricity is converted to direct current.Specifically, the input side both ends of common mode inductance L3 bridge power firestreak interface-ACL and power supply zero respectively
Line interface ACN, outlet side both ends bridge the input terminal of the first low pass LC filter 101；First low pass LC filter 101 wraps
It includes the first capacitor C1 for bridging the outlet side both ends of common mode inductance L3, the exchange firewire input terminal of bridging rectifier bridge U and exchanges zero
Second capacitor C2 of line input terminal and the first inductance L1 being connected between first capacitor C1 and the second capacitor C2；Second is low
The direct-flow positive pole V+ and direct current cathode V- of the input terminal bridging rectifier bridge U of logical LC filter 102, output end is for connecting load
(not shown).Therefore, it is respectively set by the Π type low pass LC filter and DC output side of the exchange input side of rectifier bridge
Low pass LC filter, effectively filter out the DM EMI signal in power down road, and pass through the synergistic effect with common mode inductance, realize
Three-level filtering and the problem of can effectively solve the problem that conduction interference, improve the EMI surplus of product.
In the present embodiment, rectifier bridge U may include AC-DC conversion chip, and direct current is exported after rectified to late-class circuit
It is used with powering；The carrier of the electromagnetic compatibility filter circuit can be PCB printed circuit board；And load can be any type
The load by the provided electric power of DC power supply 1, such as can be electric heater, motor and combinations thereof etc., and the load can
To be DC load (such as directly being powered by the DC power supply), it can also be that AC load (such as can be DC power supply
The direct current exported forms alternating current through inverter operation), it can all be not construed as limiting herein.As an example, the load can be with
It is that the load of household electrical appliance and the household electrical appliance can be electromagnetic oven, electric cooker, electric pressure cooking saucepan or cooking machine etc.；Thus may be used
To effectively filter out the interference signal in household electrical appliance, it can effectively mitigate conduction interference problem.
In some embodiments, as shown in Fig. 2, the household electrical appliance can also be including electric heating boilers, correspondingly should
Load may include electrically-heated coil disk 11；And electrically-heated coil disk 11 can be resistance heating coil disk, the electromagnetic heating line of induction
Enclose disk or combinations thereof, and when electrically-heated coil disk includes electromagnetic heating induction coil disk, can through this embodiment in electricity
The effect of magnetic filter circuit significantly improves EMI surplus of the household electrical appliances under high-power electromagnetic heating IH mode.In addition, such as Fig. 2 institute
Show, the specific connection type for being connected on the first inductance L1 between first capacitor C1 and the second capacitor C2, which can be, is different from figure
Example in 1, i.e., its can also be that the exchange firewire for being connected in series in first capacitor C1 and the second capacitor C2 connection rectifier bridge is defeated
Enter between the one end at end.
As shown in figure 3, the electromagnetic heating type household electrical appliance 3 of an embodiment of the present invention comprising driving device 31, with
IGBT 32, the electromagnetic heating induction coil disk H that is connect with IGBT 32 that driving device 31 connects and for exporting direct current
DC power supply 1.Wherein, driving device 31 is used for output drive signal, and IGBT 32 is used to receive the driving signal, and can root
Electromagnetic heating induction coil disk H work and heating are controlled according to the driving signal.
Pass through IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar in IH type household electrical appliance
Transistor) during work, IGBT control output power forms oscillating circuit to electromagnetic heating induction coil disk, and external
Export oscillator signal；Wherein, a part of the oscillator signal is transmitted by rectifier bridge to power interface, and another part is by household
Electric appliance is picked up to form vortex, to heat the food inside utensil；But in this heating process, there are portion of energy meetings
Power grid is arrived along conducting wire reverse transfer, i.e., a part is radiated in the form of electromagnetic field to space, and another part energy passes through ground
Line is conducted to power grid, and the above is the source of low frequency EMI problem, and be will lead to the household electrical appliance and can not be passed through high standard
Conduction test, be unable to satisfy EMC (Electromagnetic Compatibility, Electro Magnetic Compatibility) test requirement.
It should be noted that the second low pass LC filter 102 shown in Fig. 1 and 2 can be by inductance and capacitor with any
Form composed by filter, be not specifically limited herein, and belong in the protection scope of the utility model.
The utility model embodiment discloses the circuit connection diagram of DC power supply as shown in Figure 4 hereby, can be with
It is deemed to be a preferred embodiment of embodiment illustrated in fig. 1, is characterized in particular in and exemplarily discloses in the 2nd LC filter 102
Preferred circuit connection structure.
As shown in figure 4, the DC power supply 1 of an embodiment of the present invention, wherein the second low pass LC filter 102 can also be with
It is Π mode filter comprising third capacitor C3, the 4th capacitor C4 and the second inductance L2.The both ends of third capacitor C3 bridge rectification
The direct-flow positive pole V+ and direct current cathode V- of bridge U；4th capacitor C4 is in parallel with third capacitor C3, and the both ends of C4 are negative for bridging
It carries；And second inductance L2 be connected in series between third capacitor C3 and the 4th capacitor C4.Specifically, the second inductance L2 series connection connects
It connects between one end of the direct-flow positive pole V+ of the 4th capacitor C4 and third capacitor C3 connection rectifier bridge U.
It, can be with although combining Fig. 4 to describe the exemplary structure of the first LC filter and the 2nd LC filter above
Understand, herein, that is not unfolded specifically should also be as being regarded for simple variant made by the utility model embodiment
Work is in the protection scope of the utility model, such as the second inductance L2 is connected in series in third capacitor C3 connection rectifier bridge U's
Between direct current one end cathode V- and the 4th capacitor C4 and/or the first inductance L1 is connected in series in first capacitor C1 and the second capacitor
Between one end of the exchange firewire input terminal of C1 connection rectifier bridge U, etc..
In the utility model embodiment, insertion loss is increased, and changes level-one and is filtered into three-level filtering, so that by making
Inhibited with the conduction that the two-stage LC filter circuit of common magnetic material can be competent at high-power electromagnetic oven.Preferably, inductance
L1, L2 are differential mode filter inductances, and L3 is common mode filtering inductance, and the material type selecting of the capacitor L1, L2 and L3 can be selected from following
One or more of：Ferrocart core material inductance, amorphous material inductance and alloy core material inductance.
As above, C1, C2, C3 and C4 are the X capacitor for bridging AC power source firewire and zero curve.In some preferred implementation sides
In formula, C1, C2, C3 and C4 are filter capacitor.When household electrical appliance are under electromagnetic heating IH mode, electromagnetic heating induction coil
Disk can generate the differential mode oscillator signal of 9KHz-30MKHz, in order to solve caused by the differential mode oscillator signal of the 9KHz-30MKHz
The problem of differential mode conducts, the capacitance of C1, C2, C3 and C4 are preferably 0.1 μ F-10 μ F, and thus, it is possible to preferably filter out the rule
The differential mode oscillator signal of change solves the problems, such as conduction interference of the household electrical appliance under powerful IH mode.It should be noted that full
Capacitor C1, C2, C3 and C4 of the above-mentioned capacitance of foot respectively can be an individual capacitor, but each of which also can also be
As composed by multiple capacitor parallel connections, and belong in the protection scope of the utility model.Also, multiple small capacitors simultaneously
When connection forms the capacitor of above-mentioned capacitance, more significant filter effect can be obtained, and is particularly suitable for for IH household
The EMI filters solutions of electric appliance, the IH household electrical appliance can be IH electric cooker, electric pressure cooking saucepan, electromagnetic oven cooking machine and IH electric hot water
Material etc. band cookware product.
The optional embodiment of the utility model embodiment, still, the utility model is described in detail in conjunction with attached drawing above
Embodiment be not limited to the above embodiment in detail can in the range of the technology design of the utility model embodiment
A variety of simple variants are carried out with the technical solution to the utility model embodiment, these simple variants belong to the utility model reality
Apply the protection scope of example.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the utility model is implemented
No further explanation will be given to various combinations of possible ways for example.
In addition, any combination can also be carried out between a variety of different embodiments of the utility model embodiment, as long as
It equally should be considered as the utility model embodiment disclosure of that without prejudice to the thought of the utility model embodiment.
Claims (10)
1. a kind of electromagnetic compatibility filter circuit for DC power supply, which is characterized in that DC power supply include power firestreak interface,
Zero-power line interface and rectifier bridge, the electromagnetic compatibility filter circuit include the first low pass LC filter, the second low pass LC filter
And common mode inductance, wherein：
The input side both ends of the common mode inductance bridge the power firestreak interface and the zero-power line interface respectively；
First low pass LC filter include the first capacitor for bridging the outlet side both ends of the common mode inductance, bridging it is described whole
It flows the exchange firewire input terminal of bridge and the second capacitor of AC neutral line input terminal and is connected on the first capacitor and described the
The first inductance between two capacitors；
The input terminal of second low pass LC filter bridges the direct-flow positive pole of the rectifier bridge and direct current cathode, output end are used for
Connection load.
2. circuit according to claim 1, which is characterized in that second low pass LC filter includes third capacitor,
Four capacitors and the second inductance, wherein：
The both ends of the third capacitor bridge the direct-flow positive pole and the direct current cathode of the rectifier bridge；
4th capacitor is connected in parallel to the third capacitor, and its both ends is for bridging the load；And
Second inductance is connected in series between second capacitor and the third capacitor.
3. circuit according to claim 1, which is characterized in that first inductance is connected on the second capacitance connection institute
Between the one end and the first capacitor for stating the exchange firewire input terminal of rectifier bridge.
4. circuit according to claim 1, which is characterized in that first inductance is connected on the second capacitance connection institute
Between the one end and the first capacitor for stating the AC neutral line input terminal of rectifier bridge.
5. circuit according to claim 2, which is characterized in that second inductance is connected on the third capacitance connection institute
It states between one end and the 4th capacitor of the direct current cathode of rectifier bridge.
6. circuit according to claim 2, which is characterized in that second inductance is connected on the third capacitance connection institute
It states between one end of the direct-flow positive pole of rectifier bridge and the 4th capacitor.
7. circuit according to claim 2, which is characterized in that first inductance, second inductance and the common mode
Inductance is filter inductance, and the filter inductance includes one or more of the following：Ferrocart core material inductance, amorphous material
Inductance and alloy core material inductance.
8. a kind of DC power supply, which is characterized in that including：
Such as the electromagnetic compatibility filter circuit of any of claims 1-7 for DC power supply；
Power firestreak interface and zero-power line interface；
Rectifier bridge, is configured with ac input end and DC output end, and the alternating current for being inputted ac input end is converted to
Direct current is simultaneously exported through the DC output end.
9. a kind of household electrical appliance, which is characterized in that including：
Load；And
DC power supply as claimed in claim 8, for the power supply for the load.
10. household electrical appliance according to claim 9, which is characterized in that the load includes electromagnetic heating induction coil disk,
Wherein the household electrical appliance further include：
Driving device is used for output drive signal；
IGBT is connected to the electromagnetic heating induction coil disk, the DC power supply and the driving device, and is used for basis
The driving signal heats to control the electromagnetic heating induction coil disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820880495.5U CN208174533U (en) | 2018-06-05 | 2018-06-05 | Electromagnetic compatibility filter circuit, DC power supply and household electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820880495.5U CN208174533U (en) | 2018-06-05 | 2018-06-05 | Electromagnetic compatibility filter circuit, DC power supply and household electrical appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208174533U true CN208174533U (en) | 2018-11-30 |
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ID=64365823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820880495.5U Active CN208174533U (en) | 2018-06-05 | 2018-06-05 | Electromagnetic compatibility filter circuit, DC power supply and household electrical appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208174533U (en) |
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2018
- 2018-06-05 CN CN201820880495.5U patent/CN208174533U/en active Active
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