CN104244482A - Low-cost induction cooker EMC control circuit - Google Patents
Low-cost induction cooker EMC control circuit Download PDFInfo
- Publication number
- CN104244482A CN104244482A CN201410437973.1A CN201410437973A CN104244482A CN 104244482 A CN104244482 A CN 104244482A CN 201410437973 A CN201410437973 A CN 201410437973A CN 104244482 A CN104244482 A CN 104244482A
- Authority
- CN
- China
- Prior art keywords
- loop
- circuit
- filtering interfering
- electromagnetic oven
- interference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000006698 induction Effects 0.000 title abstract 5
- 238000001914 filtration Methods 0.000 claims abstract description 70
- 230000002452 interceptive effect Effects 0.000 claims description 59
- 239000003990 capacitor Substances 0.000 claims description 31
- 238000005070 sampling Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 4
- 239000002178 crystalline material Substances 0.000 claims description 3
- 238000003032 molecular docking Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000008676 import Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Landscapes
- Filters And Equalizers (AREA)
Abstract
The invention relates to a low-cost induction cooker EMC control circuit. The EMC control circuit is characterized by comprising a first interference filtering loop, a rectifying loop and a second interference filtering loop, wherein the first interference filtering loop, the rectifying loop and the second interference filtering loop are sequentially connected between an alternating-current power supply and a power supply input end of a control board circuit of an induction cooker in series to form a loop for suppressing electromagnetic interference with the control board circuit of the induction cooker by an external power grid; the first interference filtering loop and the second interference filtering loop are respectively provided with a feedback input end to form a loop for suppressing interference with the external power grid by the control board circuit of the induction cooker. The EMC control circuit has the advantages of being simple in structure, high in anti-interference capacity, and low in production cost, the interference capacity of household appliances using the circuit is reduced, the anti-interference capacity is greatly improved, the EMC control circuit meets the European and American UL/GS import detection standards, and the international competitiveness of products in China is greatly improved.
Description
Technical field
The present invention relates to a kind of electromagnetic oven EMC control circuit of electromagnetic oven EMC circuit, particularly a kind of low cost.Belong to application electric technology invention field.
Background technology
EMC (Electro Magnetic Compatibility) is the abbreviation of Electro Magnetic Compatibility, be meant to: electronic equipment or network system have the ability of electromagnetic interference in certain opposing running environment, can't produce excessive electromagnetic interference to surrounding enviroment, be an of paramount importance part in UL/GS standard simultaneously.The popular theory of EMC is exactly a kind of process of Interferenc and anti interference in fact, and it comprises EMI and EMS; How to allow circuit have this anti-interference, be that test is challenged again concerning the designer of electromagnetic oven; Filter circuit in custom circuit uses a film filter inductance altogether, often there will be harassing and wrecking when about low-frequency range 100KHZ, and is difficult to rectification.
At present, the household appliances of China particularly electromagnetic oven enter international market.When electromagnetic oven product introduction American-European countries, a series of Valuation Standard must be met, such as, UL/GS standard, and one of most important examination criteria is in UL/GS: described product has the ability of electromagnetic interference in certain opposing running environment, excessive electromagnetic interference can't be produced to surrounding enviroment simultaneously.A lot of product, owing to not reaching this standard, cannot participate in entering international market and participate in the competition.In addition, although some products can meet UL/GS standard, because its control circuit complex structure, cost are higher, there is no price advantage when entering international market, be therefore difficult to seize competitive advantage.How simplifying circuit, reduce production cost, is one of means of taking part in international competition of product.
In sum, how to design a kind of antijamming capability strong, meet American-European UL/GS import examination criteria, and the electromagnetic oven EMC control circuit that cost is low, being that can household appliances enterprise of China take part in international competition and need the problem of solution badly, is the key point that country implements go-global strategy.
Summary of the invention
Object of the present invention is to overcome electromagnetic oven EMC control circuit complex structure in prior art, defect that production cost is high, providing the electromagnetic oven EMC control circuit of the low cost that a kind of antijamming capability is strong, anti-jamming is weak.
This circuit adopts difference film inductor, electric capacity and other conventional components and parts to form, and has that structure is simple, antijamming capability is strong and production technology simple and the feature that cost is low.
Object of the present invention can be reached by following measure:
A kind of electromagnetic oven EMC control circuit of low cost, its design feature is: comprise the first filtering interfering loop, commutating circuit and the second filtering interfering loop, and described first filtering interfering loop, commutating circuit and the second filtering interfering loop are connected between the power input of control board circuit of AC power and electromagnetic oven successively; The input external AC power supply in the first filtering interfering loop, the output in the first filtering interfering loop connects the input in the second filtering interfering loop by commutating circuit, the power input of the control board circuit of the external electromagnetic oven of output in the second filtering interfering loop, forms and suppresses external power grid to the electromagnetic interference loop of the control board circuit of electromagnetic oven; First filtering interfering loop, the second filtering interfering loop are respectively provided with a feedback input end, the defeated interference signal of the control board circuit of the feedback input end connection electromagnetic oven in the second filtering interfering loop goes out end, the output in the second filtering interfering loop connects the feedback end in the first filtering interfering loop by commutating circuit, the input of the feedback output end external AC power supply in the first filtering interfering loop, forms and suppresses the control board circuit of electromagnetic oven to disturb loop to external power grid.
Object of the present invention can also be reached by following measure:
Further, the first filtering interfering loop comprises piezo-resistance ZNR1, discharge resistance R16, filter capacitor C30, voltage sampling diode D1-D2 and filter capacitor C03; In parallel with piezo-resistance ZNR1, discharge resistance R16 and filter capacitor C30, filter capacitor C03 after the negative pole docking of voltage sampling diode D1, D2, the N line ACN of AC power connects the one end in the first filtering interfering loop by fuse FUSE1, the other end in the first filtering interfering loop connects the L line ACL of AC power.
Further, diode D3 rectification output dc voltage 300V is passed through at the negative pole joint of D1, D2.
Further, commutating circuit is bridge rectifier loop, connects into rectifier bridge by four rectifier diode D4-D7, and described filter capacitor C03 is connected across two ends of described rectifier bridge; The output of commutating circuit be rectifier bridge output, connect the input of the second filtering interfering circuit.
Further, second filtering interfering circuit is formed by connecting by differential mode inductance L1, filter capacitor C10, the output of commutating circuit passes through the power input of differential mode inductance L1 connection control plate circuit, and the junction of the power input of differential mode inductance L1 and control board circuit is by filter capacitor C10 ground connection GND; Coordinated with the connection of filter capacitor C10 by differential mode inductance L1, form and suppress external power grid to the electromagnetic interference major avenues of approach of the control board circuit of electromagnetic oven and suppress the control board circuit of electromagnetic oven to disturb major avenues of approach to external power grid.
Further, described filter capacitor C10 is a microfarad range electric capacity.
Further, described differential mode inductance L1 has and prevents from occurring at big current operation the structure that magnetic is full, and differential mode inductance L1 magnet ring is nicked open-loop design, and its inductance value is 200UH-300UH; The disturbing wave of current signal medium and low frequency section 150KHZ is suppressed.
Further, described differential mode inductance L1 is made up of non-crystalline material.
Further, the capacity of described filter capacitor C03 is 2UF.
Of the present invention have following outstanding beneficial effect:
1, the present invention is connected and composed by the first filtering interfering loop, commutating circuit and three, the second filtering interfering loop simple circuit of structure, the resistance external power grid forming the control board circuit of electromagnetic oven between the power input of the control board circuit of AC power and electromagnetic oven disturbs loop and suppresses the control board circuit of electromagnetic oven to disturb loop to external power grid, external electrical network is fallen the interference filtering that external electrical network produces the interference of control board circuit, control board circuit, can requirement smoothly by conducting in EMC.Have structure simple, take the beneficial effect few, with low cost of space on control circuit board.
2, the present invention is fallen to the interference of control board circuit, control board circuit external electrical network by the second filtering interfering circuit to the interference filtering that external electrical network produces, the disturbing wave of current signal medium and low frequency section 150KHZ is suppressed, there is the beneficial effect that circuit structure is simple, antijamming capability is strong and production cost is low.
3, the present invention forms forward input and reverse feedback loop, there is bidirectional filtering structure, both can external interference in filtering external electrical network, again can filtering control board circuit produce the interference to external electrical network, substantially increase stability and the fail safe of circuit, reduce the interference effect to ambient electron product electronic circuit.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the specific embodiment of the invention 1.
Fig. 2 is the circuit theory diagrams of the specific embodiment of the invention 1.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail:
Specific embodiment:
See figures.1.and.2, the electromagnetic oven EMC control circuit of the low cost that the present invention relates to, between the power input of control board circuit 5 being arranged on AC power 1 and electromagnetic oven, comprises the first filtering interfering loop 2, commutating circuit 3 and the second filtering interfering loop 4; The input external AC power supply 1 in the first filtering interfering loop 2, the output in the first filtering interfering loop 2 connects the input in the second filtering interfering loop 4 by commutating circuit 3, the power input of the control board circuit 5 of the external electromagnetic oven of output in the second filtering interfering loop 4, forms the resistance external power grid interference loop of the control board circuit 5 of electromagnetic oven; First filtering interfering loop 4, filtering interfering loop 2, second is respectively provided with a feedback input end, the defeated interference signal of the control board circuit 5 of the feedback input end connection electromagnetic oven in the second filtering interfering loop 4 goes out end, the output in the second filtering interfering loop 4 connects the feedback end in the first filtering interfering loop 2 by commutating circuit 3, the input of the feedback output end external AC power supply 1 in the first filtering interfering loop 2, forms the control board circuit 5 pairs of external power grid interference loops suppressing electromagnetic oven.
In the present embodiment:
First filtering interfering loop 2 comprises piezo-resistance ZNR1, discharge resistance R16, filter capacitor C30, voltage sampling diode D1-D2 and filter capacitor C03; In parallel with piezo-resistance ZNR1, discharge resistance R16 and filter capacitor C30, filter capacitor C03 after the negative pole docking of voltage sampling diode D1, D2, the N line ACN of AC power 1 connects the one end in the first filtering interfering loop 2 by fuse FUSE1, the other end in the first filtering interfering loop 2 connects the L line ACL of AC power 1.Diode D3 rectification output dc voltage 300V is passed through at the negative pole joint of D1, D2.Commutating circuit 3 is bridge rectifier loop, connects into rectifier bridge by four rectifier diode D4-D7, and described filter capacitor C03 is connected across two ends of described rectifier bridge; The output of commutating circuit 3 be rectifier bridge output, connect the input of the second filtering interfering circuit 4.Second filtering interfering circuit 4 is formed by connecting by differential mode inductance L1, filter capacitor C10, the output of commutating circuit 3 passes through the power input of differential mode inductance L1 connection control plate circuit 5, and the junction of the power input of differential mode inductance L1 and control board circuit 5 is by filter capacitor C10 ground connection GND.Described filter capacitor C10 is a microfarad range electric capacity.Described differential mode inductance L1 has and prevents from occurring at big current operation the structure that magnetic is full, and differential mode inductance L1 magnet ring is nicked open-loop design, and its inductance value is 200UH-300UH.Described differential mode inductance L1 is made up of non-crystalline material.The capacity of described filter capacitor C03 is 2UF.
Two ends and discharge resistance R16, filter capacitor C03, C30 of reference Fig. 2, piezo-resistance ZNR1 are connected in parallel; One end of piezo-resistance ZNR1 is connected with the positive pole of diode D1 and is connected to the live wire of civil power; The negative pole of diode D2 is connected with the positive pole of the negative pole of diode D1, diode D3, positive pole is connected to the other end without quick voltage ZNR1 and be connected to the zero line of civil power by fuse FUSE1; The positive pole of diode D4 is connected with the positive pole of one end of filter capacitor C03, diode D7; The negative pole of diode D4 is connected with the positive pole of diode D5 and ground connection; The positive pole of diode D6 is connected with the negative pole of diode D5, negative pole is connected with the negative pole of diode D7, one end of differential mode inductance L1; In described second filtering interfering circuit 3, one end of differential mode inductance is connected with the negative pole of diode D5, D7, the other end is connected with one end of electric capacity C10, the input of control circuit; The other end ground connection of electric capacity C10.Described differential mode inductance L1 adopts open loop structure design, prevents big current magnetic saturation phenomenon.
The present embodiment can form two kinds of technical schemes:
UL scheme: the special processing of local circuit, obtain UL Valuation Standard, adopt fuse FUSE1 control, transformer current sampling, VIPER12+ high frequency transformer Switching Power Supply scheme, control board circuit be Samsung 9488, charactron+LED shows, operating voltage 120V, 60HZ.
GS scheme: obtain GS Valuation Standard, adopt fuse FUSE1 control, transformer current sampling, VIPER12+ high frequency transformer Switching Power Supply scheme, control board circuit be Samsung 9488, charactron+LED shows, within stand-by power consumption 1W, operating voltage 230V, 50HZ power 2000W.
EMC (Electro Magnetic Compatibility) is the abbreviation of Electro Magnetic Compatibility, be meant to: electronic equipment or network system have the ability of electromagnetic interference in certain opposing running environment, can't produce excessive electromagnetic interference to surrounding enviroment, be an of paramount importance part in UL/GS standard simultaneously.The popular theory of EMC is exactly a kind of process of Interferenc and anti interference in fact, and it comprises EMI and EMS; How to allow circuit have this anti-interference, be that test is challenged again concerning the designer of electromagnetic oven; Filter circuit in custom circuit uses a film filter inductance altogether, often there will be harassing and wrecking when about low-frequency range 150KHZ, and is difficult to rectification.
The above; be only the present invention's preferably specific embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all belonged to protection scope of the present invention.
Claims (9)
1. the electromagnetic oven EMC control circuit of a low cost, it is characterized in that: comprise the first filtering interfering loop (2), commutating circuit (3) and the second filtering interfering loop (4), described first filtering interfering loop (2), commutating circuit (3) and the second filtering interfering loop (4) are connected between the power input of control board circuit (5) of AC power (1) and electromagnetic oven successively, the input external AC power supply (1) in the first filtering interfering loop (2), the output in the first filtering interfering loop (2) connects the input in the second filtering interfering loop (4) by commutating circuit (3), the power input of the control board circuit (5) of the external electromagnetic oven of output in the second filtering interfering loop (4), forms and suppresses external power grid to the electromagnetic interference loop of the control board circuit (5) of electromagnetic oven, first filtering interfering loop (2), second filtering interfering loop (4) is respectively provided with a feedback input end, the defeated interference signal of the control board circuit (5) of the feedback input end connection electromagnetic oven in the second filtering interfering loop (4) goes out end, the output in the second filtering interfering loop (4) connects the feedback end in the first filtering interfering loop (2) by commutating circuit (3), the input of the feedback output end external AC power supply (1) in the first filtering interfering loop (2), form and suppress the control board circuit (5) of electromagnetic oven to external power grid interference loop.
2. the electromagnetic oven EMC control circuit of a kind of low cost according to claim 1, is characterized in that: the first filtering interfering loop (2) comprises piezo-resistance ZNR1, discharge resistance R16, filter capacitor C30, voltage sampling diode D1-D2 and filter capacitor C03; In parallel with piezo-resistance ZNR1, discharge resistance R16 and filter capacitor C30, filter capacitor C03 after the negative pole docking of voltage sampling diode D1, D2, the N line ACN of AC power (1) connects the one end in the first filtering interfering loop (2) by fuse FUSE1, the other end in the first filtering interfering loop (2) connects the L line ACL of AC power (1).
3. the electromagnetic oven EMC control circuit of a kind of low cost according to claim 2, is characterized in that: go out direct voltage 300V at the negative pole joint of D1, D2 by diode D8 rectification.
4. the electromagnetic oven EMC control circuit of a kind of low cost according to claim 2, it is characterized in that: commutating circuit (3) is bridge rectifier loop, connect into rectifier bridge by four rectifier diode D4-D7, described filter capacitor C03 is connected across two ends of described rectifier bridge; The output of commutating circuit (3) be rectifier bridge output, connect the input of the second filtering interfering circuit (4).
5. the electromagnetic oven EMC control circuit of a kind of low cost according to claim 2, it is characterized in that: the second filtering interfering circuit (4) is formed by connecting by differential mode inductance L1, filter capacitor C10, the output of commutating circuit (3) passes through the power input of differential mode inductance L1 connection control plate circuit (5), and the junction of the power input of differential mode inductance L1 and control board circuit (5) is by filter capacitor C10 ground connection GND; Coordinated with the connection of filter capacitor C10 by differential mode inductance L1, form and suppress external power grid to the electromagnetic interference major avenues of approach of the control board circuit (5) of electromagnetic oven and suppress the control board circuit (5) of electromagnetic oven to external power grid interference major avenues of approach.
6. the electromagnetic oven EMC control circuit of a kind of low cost according to the arbitrary claim of claim 2 to 5, is characterized in that: described filter capacitor C10 is a microfarad range electric capacity.
7. the electromagnetic oven EMC control circuit of a kind of low cost according to the arbitrary claim of claim 2 to 5, it is characterized in that: described differential mode inductance L1 has and prevents from occurring at big current operation the structure that magnetic is full, differential mode inductance L1 magnet ring is nicked open-loop design, and its inductance value is 200UH ~ 300UH; The disturbing wave of current signal medium and low frequency section 150KHZ is suppressed.
8. the electromagnetic oven EMC control circuit of a kind of low cost according to the arbitrary claim of claim 2 to 5, is characterized in that: described differential mode inductance L1 is made up of non-crystalline material.
9. the electromagnetic oven EMC control circuit of a kind of low cost according to the arbitrary claim of claim 2 to 5, is characterized in that: the capacity of described filter capacitor C03 is 2UF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410437973.1A CN104244482A (en) | 2014-08-29 | 2014-08-29 | Low-cost induction cooker EMC control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410437973.1A CN104244482A (en) | 2014-08-29 | 2014-08-29 | Low-cost induction cooker EMC control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104244482A true CN104244482A (en) | 2014-12-24 |
Family
ID=52231580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410437973.1A Pending CN104244482A (en) | 2014-08-29 | 2014-08-29 | Low-cost induction cooker EMC control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104244482A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105114998A (en) * | 2015-09-02 | 2015-12-02 | 九阳股份有限公司 | Control method for electromagnetic oven with low power consumption |
| CN108075474A (en) * | 2016-11-18 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Filter circuit, electromagnetic heating Household appliance control circuit and household electrical appliance |
| CN112188688A (en) * | 2020-09-09 | 2021-01-05 | 高达文科技控股有限公司 | LED lamp |
-
2014
- 2014-08-29 CN CN201410437973.1A patent/CN104244482A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105114998A (en) * | 2015-09-02 | 2015-12-02 | 九阳股份有限公司 | Control method for electromagnetic oven with low power consumption |
| CN108075474A (en) * | 2016-11-18 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Filter circuit, electromagnetic heating Household appliance control circuit and household electrical appliance |
| CN112188688A (en) * | 2020-09-09 | 2021-01-05 | 高达文科技控股有限公司 | LED lamp |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105047385B (en) | A kind of EMI suppression circuits of high frequency transformer and its composition | |
| CN204517680U (en) | A kind of interchange inputs doubleway output DC-stabilized circuit | |
| CN104244482A (en) | Low-cost induction cooker EMC control circuit | |
| CN206517627U (en) | A kind of constant-power control circuit and apply its electromagnetic heating apparatus and household electrical appliance | |
| CN106786391B (en) | Switch power over-voltage protection circuit and Switching Power Supply | |
| CN206226275U (en) | Switching power supply output filter unit, filter circuit and household appliances | |
| CN103592511B (en) | A kind of circuit detecting ac power frequency | |
| CN220473639U (en) | Circuit for conduction test of power supply of magic lamp | |
| CN109061277A (en) | A kind of zero crossing detection device and detection method based on electromagnetic induction | |
| CN204858963U (en) | Electromagnetic type adds thermoelectric rice cooker's filter circuit for electromagnetic heating | |
| CN204905021U (en) | High -frequency transformer and EMI suppression circuit who constitutes thereof | |
| CN202256445U (en) | Voltage detection circuit | |
| CN102244469A (en) | Switching power supply capable of suppressing current harmonic waves | |
| CN203723931U (en) | An anti-interference food processor | |
| CN206313657U (en) | EMC filter circuit and electromagnetism stove | |
| CN206149135U (en) | EMC filter circuit and electromagnetism stove | |
| CN222192133U (en) | Low power consumption zero-crossing detection circuit, isolation switch power supply and equipment | |
| CN202837873U (en) | Zero power standby circuit and corresponding electronic product | |
| CN206211829U (en) | Electromagnetic compatibility filter circuit, dc source and household electrical appliance | |
| CN208063038U (en) | A kind of power circuit | |
| CN112994440A (en) | Electromagnetic interference suppression device and method of power adapter and power adapter | |
| CN206313650U (en) | Electromagnetic compatibility wave filter and household electrical appliance | |
| CN202617396U (en) | Induction cooker circuit | |
| CN206180833U (en) | Electromagnetic compatibility wave filter and domestic appliance | |
| CN205178861U (en) | Multiplexed output steady voltage treater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141224 |