CN208174531U - 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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- CN208174531U CN208174531U CN201820865764.0U CN201820865764U CN208174531U CN 208174531 U CN208174531 U CN 208174531U CN 201820865764 U CN201820865764 U CN 201820865764U CN 208174531 U CN208174531 U CN 208174531U
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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：First low pass LC filter, including first capacitor and the first inductance, wherein the both ends of the first capacitor bridge the power firestreak interface and the zero-power line interface, and first inductance is connected in series between the ac input end of the rectifier bridge and the first capacitor；Second low pass LC filter, input terminal bridge the direct-flow positive pole and direct current cathode of the rectifier bridge, and output end is for connecting load.Two-stage low-pass filter collective effect is enabled as a result, can effectively filter out DM EMI signal, mitigates conduction interference problem, and 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 are caused tight when household appliances in the prior art work under high-power IH mode at least to solve
The problem of conduction interference of weight.
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, and wherein the electromagnetic compatibility filter circuit includes：
First low pass LC filter, including first capacitor and the first inductance, wherein the both ends of the first capacitor bridge the power supply fire
Line interface and the zero-power line interface, and first inductance is connected in series in ac input end and the institute of the rectifier bridge
It states between first capacitor；Second low pass LC filter, input terminal bridges the direct-flow positive pole and direct current cathode of the rectifier bridge, defeated
Outlet is for connecting load.
Optionally, second low pass LC filter includes the second capacitor, third capacitor and the second inductance, wherein：It is described
The both ends of second capacitor bridge the direct-flow positive pole and the direct current cathode of the rectifier bridge；The third capacitor is connected in parallel to institute
The second 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 be connected in series in the rectifier bridge AC neutral line input terminal and the first capacitor
Between.
Optionally, first inductance be connected in series in the rectifier bridge exchange firewire input terminal and the first capacitor
Between.
Optionally, second inductance is connected in series in rectifier bridge described in the third capacitor and second capacitance connection
The direct-flow positive pole one end between.
Optionally, second inductance is connected in series in rectifier bridge described in the third capacitor and second capacitance connection
The direct current cathode one end between.
Optionally, first inductance and second inductance are filter inductance, wherein the filter inductance includes following
One or more of：Ferrocart core material inductance, amorphous material inductance and alloy core material inductance.
Optionally, the capacitance of the first capacitor, second capacitor and the third capacitor is 0.1 μ F-10 μ F.
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.
On the one hand the utility model embodiment also 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 exchange input side and DC output side in the rectifier bridge of DC power supply are respectively set
Thus one low pass LC filter and the second low pass LC filter enable two-stage low-pass filter collective effect, can effectively filter out difference
Mould interference signal mitigates conduction interference problem, and household appliances can be greatly improved under high-power electromagnetic heating mode
EMI surplus.
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 A is the circuit connection diagram of the DC power supply of an embodiment of the present invention；
Fig. 4 B is the circuit connection diagram of the DC power supply of an embodiment of the present invention；
Fig. 4 C is the circuit connection diagram of the DC power supply of an embodiment of the present invention；
Fig. 4 D 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
C3 third capacitor the second inductance of L2
3 electromagnetic heating type household electrical appliance of the first inductance of L1
32 IGBT, 31 driving device
H electromagnetic heating induction coil disk
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 and the second low pass LC filter 102, wherein power firestreak interface-ACL is for connecting AC power source firewire, power supply zero
Line interface ACN is for connecting AC power source zero curve, and rectifier bridge U is for realizing rectification function to be converted to the alternating current inputted
Direct current.Specifically, the first low pass LC filter 101 includes the first inductance L1 and first capacitor C1, the both ends of first capacitor C1
Bridge power firestreak interface-ACL and zero-power line interface ACN, and the first inductance be connected in series in rectifier bridge U exchange it is defeated
Enter between end and the first capacitor C1, such as can be the AC neutral line input terminal and first capacitor for being connected in series in rectifier bridge
Between；The direct-flow positive pole V+ and direct current cathode V- of the input terminal bridging rectifier bridge U of second low pass LC filter 102, output end are used
(not shown) is loaded in connection.Therefore, pass through the respectively arranged low pass LC of exchange input side and DC output side institute of rectifier bridge
The synergistic effect of filter effectively filters out the DM EMI signal in power down road.
In the present embodiment, rectifier bridge U can be including AC-DC conversion chip, and direct current is exported after rectified to rear class electricity
Road is with use of powering；The carrier of the electromagnetic compatibility filter circuit can be PCB printed circuit board；And load can be any class
The load by the provided electric power of DC power supply 1 of type, such as can be electric heater, motor and combinations thereof etc., and the load
It can be DC load (such as directly being powered by the DC power supply), can also be that AC load (such as can be direct current
The direct current that source is exported forms alternating current through inverter operation), it can all be not construed as limiting herein.As an example, the load can
Load and the household electrical appliance to be household electrical appliance can be electromagnetic oven, electric cooker, electric pressure cooking saucepan or cooking machine etc.；Thus
The interference signal in household electrical appliance can be effectively filtered out, conduction interference problem can be effectively mitigated.
In some embodiments, as shown in Fig. 2, the household electrical appliance can also be electromagnetic heating type household electrical appliance, such as
The load includes electromagnetic heating induction coil disk H, from there through the effect of the em filtering circuit in the utility model embodiment,
It can be improved EMI surplus of the electromagnetic heating type household appliances under high-power electromagnetic heating IH mode.
Preferably, as shown in figure 3, the electromagnetic heating type household electrical appliance 3 of an embodiment of the present invention comprising driving dress
Set 31, the IGBT 32 that connect with driving device 31, the electromagnetic heating induction coil disk H connecting with IGBT 32 and straight for exporting
The DC power supply 1 of galvanic electricity.Wherein, driving device 31 is used for output drive signal, and IGBT 32 is used to receive the driving signal, and
Electromagnetic heating induction coil disk H work and heating can be 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 Electro Magnetic Compatibility EMC test requirement.
It should be noted that the first low pass LC filter 101 and the second low pass LC filter 102 shown in Fig. 1 and 2 can be with
Be as inductance and capacitor in the form of arbitrary composed by filter, be not specifically limited herein, and belong to the utility model
Protection scope in.
The utility model embodiment discloses the circuit connection diagram of DC power supply as shown in figures 4 a-d hereby, can
To be deemed to be a preferred embodiment of embodiment illustrated in fig. 2, be characterized in particular in exemplarily disclose it is excellent in LC filter
The circuit connection structure of choosing.
As shown in Figure 4 A, the DC power supply 1 of an embodiment of the present invention, wherein the first low pass LC filter 101 includes
First capacitor C1 and the first inductance L1, the second low pass LC filter 102 include the second capacitor C2, third capacitor C3 and the second inductance
L2.Specifically, both ends bridging power firestreak interface-ACL and zero-power line interface ACN, the first inductance L1 series connection of first capacitor C1
It is connected between the AC neutral line input terminal of rectifier bridge and first capacitor C1；The direct current of the both ends bridging rectifier bridge of second capacitor C2
Positive V+ and direct current cathode V-, third capacitor C3 are in parallel with the second capacitor C2, and the third both ends capacitor C3 are loaded for bridging,
Second inductance L2 is connected in series between third capacitor C3 and one end of the second capacitor C2 connection direct current cathode V-.
Fig. 4 B-D can be considered to be the modification of Fig. 4 A, specifically, as shown in Figure 4 B, the first inductance L1 is connected to rectifier bridge
Between the exchange firewire input terminal and first capacitor C1 of U and the second inductance L2 is connected to third capacitor C3 and the second capacitor C2
Between the one end for connecting the direct current cathode V- of rectifier bridge U.As shown in Figure 4 C, the first inductance L1 is connected to the exchange fire of rectifier bridge U
Between line input terminal and first capacitor C1 and the second inductance L2 is connected to third capacitor C3 and the second capacitor C2 connection rectifier bridge
Between one end of the direct-flow positive pole V+ of U.As shown in Figure 4 D, the first inductance L1 be connected to rectifier bridge U AC neutral line input terminal and
Between first capacitor C1 and the second inductance L2 is being connected to the direct current of third capacitor C3 and the second capacitor C2 connection rectifier bridge U just
Between one end of pole V+.
In the utility model embodiment, insertion loss is increased, and changes level-one and is filtered into two stage filter, allows to lead to
It crosses and is inhibited using the conduction that the two-stage LC filter circuit of common magnetic material can be competent at high-power electromagnetic oven.Preferably,
Inductance L1 and L2 are filter inductance, and it may include one or more of following for specifically can be：It is ferrocart core material inductance, non-
Brilliant material inductance and alloy core material inductance.
As above, C1, C2 and C3 are the X capacitor for bridging AC power source firewire and zero curve.In some preferred embodiments
In, C1, C2 and C3 are filter capacitor.When household electrical appliance are under electromagnetic heating IH mode, electromagnetic heating induction coil disk meeting
The differential mode oscillator signal of 9KHz-30MKHz is generated, in order to solve differential mode caused by the differential mode oscillator signal of the 9KHz-30MKHz
The problem of conduction, the capacitance of C1, C2 and C3 are preferably 0.1 μ F-10 μ F, and thus, it is possible to preferably filter out the differential mode of the regularization
Oscillator signal solves the problems, such as conduction interference of the household electrical appliance under powerful IH mode.It should be noted that meeting above-mentioned electricity
Capacitor C1, C2 and C3 of capacity respectively can be an individual capacitor, but each of which also can also be by multiple capacitors
Composed by device parallel connection, and belong in the protection scope of the utility model.Also, it is composed in parallel in multiple small capacitors above-mentioned
When the capacitor of capacitance, more significant filter effect can be obtained, and is particularly suitable for filtering for the EMI of IH household electrical appliance
Wave scheme, 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 (11)
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, wherein the electromagnetic compatibility filter circuit include：
First low pass LC filter, including first capacitor and the first inductance, wherein the both ends of the first capacitor bridge the electricity
Source fire-wire interfaces and the zero-power line interface, and first inductance is connected in series in the ac input end of the rectifier bridge
Between the first capacitor；
Second low pass LC filter, input terminal bridge the direct-flow positive pole and direct current cathode of the rectifier bridge, and output end is for connecting
Connect load.
2. circuit according to claim 1, which is characterized in that second low pass LC filter includes the second capacitor, the
Three capacitors and the second inductance, wherein：
The both ends of second capacitor bridge the direct-flow positive pole and the direct current cathode of the rectifier bridge；
The third capacitor is connected in parallel to second 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 in series in the friendship of the rectifier bridge
It flows between zero curve input terminal and the first capacitor.
4. circuit according to claim 1, which is characterized in that first inductance is connected in series in the friendship of the rectifier bridge
Between filariasis line input terminal and the first capacitor.
5. circuit according to claim 2, which is characterized in that second inductance be connected in series in the third capacitor and
Between one end of the direct-flow positive pole of rectifier bridge described in second capacitance connection.
6. circuit according to claim 2, which is characterized in that second inductance be connected in series in the third capacitor and
Between one end of the direct current cathode of rectifier bridge described in second capacitance connection.
7. circuit according to claim 2, which is characterized in that first inductance and second inductance are filtered electrical
Sense, wherein the filter inductance includes one or more of the following：Ferrocart core material inductance, amorphous material inductance and alloy magnetic
Core material inductance.
8. circuit according to claim 2, which is characterized in that the first capacitor, second capacitor and the third
The capacitance of capacitor is 0.1 μ F-10 μ F.
9. a kind of DC power supply, which is characterized in that including：
Such as the electromagnetic compatibility filter circuit of any of claims 1-8 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.
10. a kind of household electrical appliance, which is characterized in that including：
Load；And
DC power supply as claimed in claim 9, for the power supply for the load.
11. household electrical appliance according to claim 10, 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 |
|---|---|---|---|
| CN201820865764.0U CN208174531U (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 |
|---|---|---|---|
| CN201820865764.0U CN208174531U (en) | 2018-06-05 | 2018-06-05 | Electromagnetic compatibility filter circuit, DC power supply and household electrical appliance |
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| Publication Number | Publication Date |
|---|---|
| CN208174531U true CN208174531U (en) | 2018-11-30 |
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| CN201820865764.0U Active CN208174531U (en) | 2018-06-05 | 2018-06-05 | Electromagnetic compatibility filter circuit, DC power supply and household electrical appliance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478574A (en) * | 2020-04-14 | 2020-07-31 | 华东计算技术研究所（中国电子科技集团公司第三十二研究所） | Electromagnetic leakage suppression method and system for power panel output port with filter |
-
2018
- 2018-06-05 CN CN201820865764.0U patent/CN208174531U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478574A (en) * | 2020-04-14 | 2020-07-31 | 华东计算技术研究所（中国电子科技集团公司第三十二研究所） | Electromagnetic leakage suppression method and system for power panel output port with filter |
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