CN108075637A - EMC filter circuit, electromagnetic heating Household appliance control circuit and household electrical appliance - Google Patents
EMC filter circuit, electromagnetic heating Household appliance control circuit and household electrical appliance Download PDFInfo
- Publication number
- CN108075637A CN108075637A CN201611015166.6A CN201611015166A CN108075637A CN 108075637 A CN108075637 A CN 108075637A CN 201611015166 A CN201611015166 A CN 201611015166A CN 108075637 A CN108075637 A CN 108075637A
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- Prior art keywords
- mode inductance
- common mode
- capacitance
- filter circuit
- emc filter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The present invention relates to field of circuit technology, disclose a kind of EMC filter circuit, electromagnetic heating Household appliance control circuit and household electrical appliance, and when solving electromagnetic oven heating, electromagnetic radiation couples the influence to conducted emission test by common mode inductance.The circuit includes common mode inductance, the first end of the common mode inductance and the firewire of AC power connect, second end is connected with the zero curve of the AC power, load is connected between 3rd end of the common mode inductance and the 4th end, the circuit further includes the first capacitance, and first capacitance connection is between the first end and second end of the common mode inductance.The embodiment of the present invention is suitable for the EMC filter circuit of conducted emission test.
Description
Technical field
The present invention relates to field of circuit technology, and in particular, to a kind of EMC filter circuit, electromagnetic heating home wiring control electricity
Road and household electrical appliance.
Background technology
Electromagnetic compatibility (Electro Magnetic Compatibility, EMC) be to electronic product in terms of electromagnetic field
The Comprehensive Assessment of size and antijamming capability is disturbed, is one of most important index of product quality.Electromagnetic compatibility test is divided into electricity
Magnetic harassing and wrecking test and electromagnetic immunity test, wherein electromagnetic disturbance test have EMC emission test and conducted emission test etc..
National regulation, electromagnetic oven must also are fulfilled for EMC requirements.Current electromagnetic oven is in order to inhibit radiation disturbance, as shown in Figure 1
In EMC filter circuit, a common mode inductance L1 can be generally set after power cord inlet wire, still, if L1 is apart from electromagnetic oven
When drum is excessively near, when electromagnetic oven works, electromagnetic radiation will be coupled to by L1 in alternating current circuit, cause passed
When leading harassing and wrecking test, conduct data can be caused higher compared with standard value, even more than standard value so that electromagnetic oven cannot
Pass through conducted emission test.
The content of the invention
The embodiment of the present invention is to provide a kind of EMC filter circuit, electromagnetic heating Household appliance control circuit and household electrical appliance, solution
During electromagnetic oven heating of having determined, electromagnetic radiation couples the influence to conducted emission test by common mode inductance.
To achieve these goals, the embodiment of the present invention adopts the following technical scheme that：
The present invention provides a kind of EMC filter circuits, including common mode inductance, the first end and alternating current of the common mode inductance
The firewire connection in source, second end is connected with the zero curve of the AC power, between the 3rd end of the common mode inductance and the 4th end
Connection load, the circuit further include the first capacitance, and first capacitance connection is in the first end and second of the common mode inductance
Between end.
Optionally, first capacitance is nonpolar capacitance.
Optionally, the pressure voltage scope of first capacitance is within 300V.
Optionally, the circuit further includes current insurance pipe, one end and the AC power of the current insurance pipe
Firewire connects, and the other end of the current insurance pipe is connected with one end of first capacitance.
Optionally, the circuit further includes π type LC filter units.
Optionally, the π types LC filter units include the second capacitance, the 3rd capacitance and differential mode inductance, the differential mode electricity
The first end of sense connects the 4th end of the common mode inductance, the second end of the differential mode inductance and the 3rd end of the common mode inductance
Between connect load, second capacitance is connected in parallel between the 3rd end of the common mode inductance and the 4th end, the 3rd capacitance
It is connected in parallel between the second end of the differential mode inductance and the 3rd end of the common mode inductance.
The present invention also provides a kind of electromagnetic heating Household appliance control circuits, include EMC filter circuit as described above and electricity
Device control unit, the electrical control unit are used to control electromagnetic heating.
Optionally, the electromagnetic heating household electrical appliances are electromagnetic oven.
The present invention also provides a kind of household electrical appliance, the household electrical appliance include EMC filter circuit as described above.
Optionally, the household electrical appliance are electromagnetic oven, electric cooker, electric pressure cooking saucepan, electric cooking pot, soy bean milk making machine, coffee machine, laundry
Any one in machine, refrigerator, air-conditioning, smoke exhaust ventilator, electric heater, water dispenser, dust catcher or mixer.
Through the above technical solutions, setting a filter capacitor on AC power firewire, then set gradually common mode inductance
With other filter elements, when solving electromagnetic oven heating, electromagnetic radiation couples the shadow to conducted emission test by common mode inductance
It rings.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is together for explaining the present invention, but be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the circuit diagram of existing EMC filter circuit；
Fig. 2 is a kind of circuit diagram of EMC filter circuit provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram of another EMC filter circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of schematic diagram of electromagnetic heating Household appliance control circuit provided in an embodiment of the present invention.
Specific embodiment
The specific embodiment of the present invention is described in detail below in conjunction with attached drawing.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
A kind of EMC filter circuit provided in an embodiment of the present invention, as shown in Fig. 2, including common mode inductance L1, the common mode electricity
The firewire of the first end and AC power of feeling L1 connects, and second end is connected with the zero curve of the AC power, the common mode inductance
Load is connected between the 3rd end of L1 and the 4th end, the circuit further includes the first capacitance C1, and the first capacitance C1 is connected to
Between the first end and second end of the common mode inductance L1.
In said program, a filter capacitor on AC power firewire is set, then sets gradually common mode inductance and other
Filter element, when solving electromagnetic oven heating, electromagnetic radiation couples the influence to conducted emission test by common mode inductance.
Wherein, the first capacitance C1 is the nonpolar capacitance in safety capacitance, is specifically as follows X capacitances, wherein described
Safety capacitance is after capacitor failure, will not cause to shock by electricity, not jeopardize the capacitor of personal safety.The X capacitances are bridgings
Capacitance between AC power firewire and AC power zero curve, generally metal thin film capacitor.X capacitances inhibit DM EMI.
The pressure voltage scope of the first capacitance C1 is within 300V.
In electronic circuit, capacitor is used for by exchanging to obstruct direct current, is also used for storing and discharging charge to serve as
Wave filter, smooth output ripple signal.In AC power, capacitor continuously charges, discharges capacitor, will be flowed in circuit
Cross, phase different charging current and discharge current consistent with alternating current changing rule.The capacitance of capacitor is bigger, and impedance is got over
It is small, by frequency it is also higher.If the capacitance of capacitor is infinitely great, then capacitor is equivalent to access, if capacitor
Capacitance is infinitely small, then capacitor is equivalent to open circuit.In filter circuit, the effect of capacitor be exactly obstructed by high frequency it is low
Frequently.The bigger low frequency of capacitance of capacitor is less susceptible to pass through.
Common mode inductance is a common mode interference suppression device using ferrite as magnetic core, it is identical by two sizes, the number of turn
Identical coil is symmetrically wound on same ferrite toroidal magnetic core, forms a four-terminal device, be for common-mode signal
It is inhibited to show big inductance, and the leakage inductance that very little is showed for difference mode signal does not almost work.Principle is
Magnetic flux when flowing through common mode current in magnet ring is overlapped mutually, so as to which with sizable inductance value, inhibition is played to common mode current
Effect, and when two coils flow through differential-mode current, the magnetic flux in magnet ring is cancelled out each other, almost without inductance value, so differential mode is electric
Stream can pass through undampedly.Therefore common mode inductance can effectively inhibit common mode interference signal in balanced circuit, and to circuit
The difference mode signal of normal transmission is without influence.
As shown in figure 3, the circuit further includes current insurance pipe FUSE, one end of the current insurance pipe FUSE with it is described
The firewire connection of AC power, the other end of the current insurance pipe FUSE are connected with one end of first capacitance.The electricity
Stream protective tube FUSE is arranged on for safety requirement on the firewire of the AC power.When current insurance pipe is powered, converted by electric energy
Heat the temperature of fusable links is made to increase.Running current or the overload current of permission by when, the heat of generation is by can
Melt, outer housing are progressivelyed reach flat to ambient radiation by the heat of the heat that the modes such as convection current, conduction distribute and generation
Weighing apparatus.If the heat generated is more than the heat distributed, extra heat is just gradually accumulated in fusable links, makes on fusible temperature
It rises, when temperature reaches and exceeds the fusing point of fusable links, fusable links fusing will be made, fuse and cut off electric current, play safety
Protect the effect of circuit.
In addition, as shown in figure 3, the circuit further includes π type LC filter units, the π types LC filter units include second
Capacitance C2, the 3rd capacitance C3 and differential mode inductance L2, the first end of the differential mode inductance L2 connect the of the common mode inductance L1
Load, second capacitance are connected between the 3rd end of four ends, the second end of the differential mode inductance L2 and the common mode inductance L1
C2 is connected in parallel between the 3rd end and the 4th end of the common mode inductance L1, and the 3rd capacitance C3 is connected in parallel on the differential mode inductance L2
Second end and the common mode inductance L1 the 3rd end between.
It can also be connected as needed between the 3rd end of the differential mode inductance L2 second ends and the common mode inductance L1
Other filter elements, do not limit here.
In addition, as shown in figure 4, the embodiment of the present invention also provides a kind of electromagnetic heating Household appliance control circuit 40, comprising as above
The EMC filter circuit 41 and electrical control unit 42, the electrical control unit 42 are used to control electromagnetic heating.It is described
Electromagnetic heating household electrical appliances can be electromagnetic oven.
The embodiment of the present invention also provides a kind of household electrical appliance, and the household electrical appliance include above-mentioned EMC filter circuit.Pass through
One filter capacitor on AC power firewire is set, then sets gradually common mode inductance and other filter elements, solves family expenses
When electric appliance heats, electromagnetic radiation couples the influence to conducted emission test by common mode inductance.
The household electrical appliance can be electromagnetic oven, or electric cooker, electric pressure cooking saucepan, electric cooking pot, soy bean milk making machine, coffee
Any one in machine, washing machine, refrigerator, air-conditioning, smoke exhaust ventilator, electric heater, water dispenser, dust catcher or mixer.
The preferred embodiment of the present invention is described in detail above in association with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical scheme
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that the specific technical features described in the above specific embodiments, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of EMC filter circuit, including common mode inductance, the first end of the common mode inductance and the firewire of AC power connect,
Second end is connected with the zero curve of the AC power, and load is connected between the 3rd end of the common mode inductance and the 4th end, special
Sign is that the circuit further includes the first capacitance, and first capacitance connection is in the first end and second end of the common mode inductance
Between.
2. EMC filter circuit according to claim 1, which is characterized in that first capacitance is nonpolar capacitance.
3. EMC filter circuit according to claim 1, which is characterized in that the pressure voltage scope of first capacitance is
Within 300V.
4. EMC filter circuit according to claim 1, which is characterized in that the circuit further includes current insurance pipe, described
One end of current insurance pipe is connected with the firewire of the AC power, the other end of the current insurance pipe and first capacitance
One end connection.
5. EMC filter circuit according to claim 1, which is characterized in that the circuit further includes π type LC filter units.
6. EMC filter circuit according to claim 5, which is characterized in that the π types LC filter units include the second electricity
Hold, the 3rd capacitance and differential mode inductance, the first end of the differential mode inductance connect the 4th end of the common mode inductance, the differential mode
Load is connected between the second end of inductance and the 3rd end of the common mode inductance, second capacitance is connected in parallel on the common mode inductance
The 3rd end and the 4th end between, the 3rd capacitance is connected in parallel on the of the second end of the differential mode inductance and the common mode inductance
Between three ends.
7. a kind of electromagnetic heating Household appliance control circuit, which is characterized in that include the EMC filtered electricals according to claim 1-6
Road and electrical control unit, the electrical control unit are used to control electromagnetic heating.
8. electromagnetic heating household electrical appliances according to claim 7 are electromagnetic oven.
9. a kind of household electrical appliance, which is characterized in that the household electrical appliance include the EMC filtered electricals according to claim 1-6
Road.
10. household electrical appliance according to claim 9, which is characterized in that the household electrical appliance are electromagnetic oven, electric cooker, electricity
Pressure cooker, electric cooking pot, soy bean milk making machine, coffee machine, washing machine, refrigerator, air-conditioning, smoke exhaust ventilator, electric heater, water dispenser, dust catcher
Or any one in mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015166.6A CN108075637A (en) | 2016-11-18 | 2016-11-18 | EMC filter circuit, electromagnetic heating Household appliance control circuit and household electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015166.6A CN108075637A (en) | 2016-11-18 | 2016-11-18 | EMC filter circuit, electromagnetic heating Household appliance control circuit and household electrical appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108075637A true CN108075637A (en) | 2018-05-25 |
Family
ID=62160071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611015166.6A Pending CN108075637A (en) | 2016-11-18 | 2016-11-18 | EMC filter circuit, electromagnetic heating Household appliance control circuit and household electrical appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108075637A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110636234A (en) * | 2018-06-22 | 2019-12-31 | 冯子祥 | Audio-visual power processor and audio-visual playing system |
| CN110926037A (en) * | 2019-12-12 | 2020-03-27 | 中山市上航电子有限公司 | Voltage regulation control method of high-power water heater compatible with EMC |
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|---|---|---|---|---|
| CN2847643Y (en) * | 2005-12-24 | 2006-12-13 | 海信集团有限公司 | Filter circuit for suppressing electromagnetic interference for 2P frequency variable air conditioner |
| JP2006352217A (en) * | 2005-06-13 | 2006-12-28 | Hitachi Ferrite Electronics Ltd | Low pass filter for dsl |
| CN201238083Y (en) * | 2008-08-06 | 2009-05-13 | 四川九洲电器集团有限责任公司 | Power cord with power supply noise filter |
| CN203027213U (en) * | 2012-11-26 | 2013-06-26 | 西安威正电子科技有限公司 | Input port filtering circuit |
| CN103840784A (en) * | 2012-11-26 | 2014-06-04 | 西安威正电子科技有限公司 | An input port filter circuit based on front-stage and back-stage differential mode filter systems |
| CN205029554U (en) * | 2015-10-19 | 2016-02-10 | 浙江凯耀照明股份有限公司 | Survey protection device of driver in ATE test system |
| CN205124026U (en) * | 2015-11-11 | 2016-03-30 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and electromagnetic heating device's filter circuit |
| CN205666807U (en) * | 2016-05-23 | 2016-10-26 | 广东美的生活电器制造有限公司 | Filter circuit , power cord subassembly and consumer |
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2016
- 2016-11-18 CN CN201611015166.6A patent/CN108075637A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006352217A (en) * | 2005-06-13 | 2006-12-28 | Hitachi Ferrite Electronics Ltd | Low pass filter for dsl |
| CN2847643Y (en) * | 2005-12-24 | 2006-12-13 | 海信集团有限公司 | Filter circuit for suppressing electromagnetic interference for 2P frequency variable air conditioner |
| CN201238083Y (en) * | 2008-08-06 | 2009-05-13 | 四川九洲电器集团有限责任公司 | Power cord with power supply noise filter |
| CN203027213U (en) * | 2012-11-26 | 2013-06-26 | 西安威正电子科技有限公司 | Input port filtering circuit |
| CN103840784A (en) * | 2012-11-26 | 2014-06-04 | 西安威正电子科技有限公司 | An input port filter circuit based on front-stage and back-stage differential mode filter systems |
| CN205029554U (en) * | 2015-10-19 | 2016-02-10 | 浙江凯耀照明股份有限公司 | Survey protection device of driver in ATE test system |
| CN205124026U (en) * | 2015-11-11 | 2016-03-30 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and electromagnetic heating device's filter circuit |
| CN205666807U (en) * | 2016-05-23 | 2016-10-26 | 广东美的生活电器制造有限公司 | Filter circuit , power cord subassembly and consumer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110636234A (en) * | 2018-06-22 | 2019-12-31 | 冯子祥 | Audio-visual power processor and audio-visual playing system |
| CN110926037A (en) * | 2019-12-12 | 2020-03-27 | 中山市上航电子有限公司 | Voltage regulation control method of high-power water heater compatible with EMC |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180525 |
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| RJ01 | Rejection of invention patent application after publication |