CN208209815U - Electromagnetic interference EMI suppression circuit, DC power supply and electric heating utensil - Google Patents
Electromagnetic interference EMI suppression circuit, DC power supply and electric heating utensil Download PDFInfo
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- CN208209815U CN208209815U CN201820771973.9U CN201820771973U CN208209815U CN 208209815 U CN208209815 U CN 208209815U CN 201820771973 U CN201820771973 U CN 201820771973U CN 208209815 U CN208209815 U CN 208209815U
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Abstract
The utility model embodiment provides a kind of electromagnetic interference EMI suppression circuit, DC power supply and electric heating utensil, belongs to electromagnetic interference circuit design field.Wherein, the electric heating utensil includes electric heater, heated object and the rectification module for electric heater power supply, the exchange firewire input terminal and AC neutral line input terminal of the rectification module are separately connected the firewire and zero curve of AC power source, for the alternating current of the AC power source to be converted to direct current and is exported via the direct-flow positive pole output end of the rectification module and direct current cathode output end, the EMI suppression circuit includes: first capacitor, bridges the power ground and the AC neutral line input terminal；Second capacitor bridges the power ground with described and exchanges firewire input terminal；And first inductance, it is connected between the power ground and the heated object.Thus it by EMI noise reverse conduction and filters out, efficiently solves the problems, such as that common mode is conducted exceeded, and improves EMI surplus of the electric heating utensil under EMI test conduction.
Description
Technical field
The utility model relates to electromagnetic interference circuit design field, more particularly to a kind of electromagnetic interference EMI suppression circuit,
DC power supply and electric heating utensil.
Background technique
With the continuous promotion that people pursue quality of the life, electric heating utensil (such as electric cooker etc.) receives vast
The favor of Market Consumer.Under the heating mode of electric heating utensil, such as IH (induction heat, electromagnetic heating) mould
Formula, usually for safety, utensil bottom or utensil metal shell can be grounded, and the introducing of these ground connection results in additional electricity
Heat the EMI problem of utensil.Specifically, during electric heating utensil heats food, although the conversion of a large amount of energy in order to
Heat, but when still there is portion of energy to conduct by ground wire to power grid, this be EMI noise main source.
Currently, in the related technology in order to solve heating utensil EMI (electromagnetic interference, electricity
Magnetic disturbance) problem, common mode inhibition device would generally be set on firewire or zero curve, to inhibit to draw because of utensil or chassis ground
The purpose of the common-mode noise entered.But present inventor found during practicing the application it is above-mentioned in the related technology
Technical solution at least have following defects that
First, common mode inhibition device head is bigger, needs to occupy the limited space of circuit board, causes additional structure empty
Between, it is unfavorable for the topology layout and design of product.
Second, common mode inhibition device cost is higher.
Third, common mode inhibition device heating amount is big, leads to the reduction of complete machine thermal conversion efficiency.
4th, novel electric heating utensil during the work time caused by EMI noise frequency it is larger, can achieve
150KHz or more, so that the electromagnetism that the common mode inhibition device in the prior art can not well solve novel electric heating utensil is dry
Problem is disturbed, it is enabled to be difficult to through EMC electromagnetic compatibility test.
As a result, it is a kind of it is low in cost, thermal losses is low, occupancy is small in size and can effectively improve novel electric heating utensil
The circuit design of EMI surplus is the popular research direction of current industry.
Utility model content
The purpose of the utility model embodiment one side be to provide it is a kind of it is low in cost, thermal losses is low, occupancy is small in size and
The electromagnetic interference EMI suppression circuit of the EMI surplus of electric heating utensil can be effectively improved.
To achieve the goals above, on the one hand it is dry to provide a kind of electromagnetism for electric heating utensil for the utility model embodiment
EMI suppression circuit is disturbed, which includes electric heater, heated object and the rectification module for electric heater power supply, is somebody's turn to do
The exchange firewire input terminal and AC neutral line input terminal of rectification module are separately connected the firewire and zero curve of AC power source, are used for institute
The alternating current for stating AC power source is converted to direct current and exports via the direct-flow positive pole output end of the rectification module and direct current cathode
End output and the heated object are connected with power ground, and wherein the EMI suppression circuit includes: first capacitor, bridging
The power ground and the AC neutral line input terminal；Second capacitor, bridge the power ground with described to exchange firewire defeated
Enter end；And first inductance, it is connected between the power ground and the heated object.
Optionally, the EMI suppression circuit further include: third capacitor bridges the exchange fire of the rectification module
Line input terminal and the AC neutral line input terminal；And second inductance, it is connected on the direct-flow positive pole of the rectification module
Between output end and the electric heater.
Specifically, the first capacitor and the capacitance size of second capacitor are 100pF-4700pF.
Specifically, first inductance and second inductance are filter inductance.
Specifically, the size of the capacitance of the third capacitor is 1 μ F-10 μ F.
In the EMI suppression circuit provided by above-mentioned technical proposal, by bridging power ground and AC neutral line input terminal
First capacitor power ground and exchanges the second capacitor of firewire input terminal with bridging, and is connected on power ground and is heated
The first inductance forms low pass LC filter together between body, can by electric heating utensil during the work time caused by high frequency be total to
Mode noise is filtered out from power interface reverse leading to EMI suppression circuit, is efficiently solved common mode and is conducted exceeded and EMI
The problem of surplus deficiency has ensured that electric heating utensil can pass through conduction test；Also, selected by the EMI suppression circuit
Electronic component is low in cost, thermal losses is low and it is small in size to occupy, and allows the EMI suppression circuit in various electric heating utensils
Middle popularization and application.
The purpose of the utility model embodiment another aspect be to provide it is a kind of it is low in cost, thermal losses is low and can effectively mention
The DC power supply of the EMI surplus of high electric heating utensil.
To achieve the goals above, the utility model embodiment provides a kind of DC power supply, comprising: above-mentioned adds for electricity
The electromagnetic interference EMI suppression circuit of hot utensil；And rectifier bridge, exchange firewire input terminal and the AC neutral line input of the rectifier bridge
End is separately connected the firewire and zero curve of AC power source, for the alternating current of the AC power source to be converted to direct current and via this
The direct-flow positive pole output end and direct current cathode output end of rectification module export.
The DC power supply provided by the utility model embodiment and above-mentioned EMI suppression circuit institute compared with the existing technology
Have the advantage that identical, details are not described herein.
The purpose of the another aspect of the utility model embodiment is to provide a kind of electric heater of EMI surplus with higher
Tool.
To achieve the goals above, the utility model embodiment provides a kind of electric heating utensil, comprising: electric heater and is added
Hot body；Above-mentioned DC power supply, for powering for the electric heater.
Specifically, the electric heating utensil is electric cooker, wherein the heated object is the magnet steel that can contact electric cooker
Interior pot, and the magnet steel connect power ground.
Specifically, the electric heater includes electric heating coil disk and/or electromagnetic heating induction coil disk.
Optionally, the center that power ground passes through the electric heating coil disk and/or the electromagnetic heating induction coil disk
It is connected to the heated object.
Optionally, the electric heating utensil includes any one in following: electric cooker, electric pressure cooking saucepan, electromagnetic oven, IH are broken
Wall machine or cooking machine.
The electric heating utensil provided by the utility model embodiment and above-mentioned EMI suppression circuit are compared with the existing technology
Possessed advantage is identical, and details are not described herein.
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 EMI suppression circuit of an embodiment of the present invention；
Fig. 2 is the structure connection diagram of the EMI suppression circuit of another embodiment of the utility model；
Fig. 3 is the structural schematic diagram of the electric heating utensil of an embodiment of the present invention.
Description of symbols
PE power ground ACL AC power source firewire
ACN AC power source zero curve U rectification module
H electric heater C1, C2, C3 capacitor
10 DC power supply of L1, L2 inductance
20 electric heating utensil, 201 driving device
202 IGBT, 203 electromagnetic heating induction coil disk
B heated object
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.
Term " first ", " second " are used for description purposes only in the description of the present invention, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " are defined as a result,
Feature can explicitly or implicitly include at least one of the features.In the description of the present invention, the meaning of " plurality " is
At least two, such as two, three etc., unless otherwise specifically defined.
As shown in Figure 1, the EMI suppression circuit for electric heating utensil is provided with first capacitor C1, the second capacitor C2 and the
One inductance L1.Wherein the EMI suppression circuit is associated with setting with rectification module U and electric heater H, the exchange firewire of rectification module U
Input terminal and AC neutral line input terminal are separately connected the firewire and zero curve of AC power source, for by the alternating current of the AC power source
Be converted to direct current；And rectification module U is used to power for electric heater H, electric heater H is used to provide heat for heated object B
Amount.It should be noted that the heating type of electric heater H can be direct current electric heating type (such as by rectification module positive and negative anodes export
End directly power supply), being also possible to AC electric-heating type, (such as the output end of rectification module implements inversion drive via such as IGBT
Dynamic power supply indirectly), and belong to the protection scope of the utility model.In addition, the type of heated object B can be diversification
, it can be corresponding with the type of electric heating utensil, such as when electric heating utensil is electric pressure cooking saucepan, which can
To be metal pan；When electric heating utensil is electric cooker, which can be interior pot etc..
For the sake of security, the heated object direct or indirect connection of the electric heating boilers in the utility model embodiment
For power ground (i.e. PE line) to be grounded, caused safety problem may be touched by people by thereby eliminating heated object.With
Electric heating utensil illustrates for electric cooker, and in running order inner pan of electric cooker is contacted with magnet steel, correspondingly should
PE line can be connection magnet steel and be indirectly connected to interior pot to realize.But present inventor is in the process for practicing the application
While middle discovery PE line is drawn from heated object, the EMI noise at power interface is also increased.Therefore, it is highly desirable pair
The safety-type electric heating boilers propose new EMI Restrain measurement, to ensure the Electro Magnetic Compatibility of electric heating utensil.
About the specific connection relationship of the EMI suppression circuit in the utility model embodiment, it can be first capacitor C1's
Both ends bridge PE line and the AC neutral line input terminal of rectification module U respectively；The friendship of second capacitor C2 bridging PE line and rectification module U
Filariasis line input terminal；And first inductance L1 be connected between PE line and heated object B, wherein inductance L1 is relative to capacitor C1
It should be not construed as limiting with the link position of C2, can be the side as shown in Figure 1 in capacitor C1 and C2, also can also be connection
((not shown)) between C1 and C2 etc..LC low-pass filter is formed by C1, C2 and L1 as a result, PE line can be effectively filtered out
On the common-mode noise that senses, more particularly to, in the high frequency common mode noise of 150KHz-30Mhz, there is outstanding inhibition to frequency
Effect.
Although embodiment shown in FIG. 1 has been illustratively described the related component of EMI suppression circuit, it is to be understood that
Be, to attached by it other function unit or module should also be as being included it is within the protection scope of the present utility model, such as
IGBT (the Insulated Gate being connected with electric heater H is also provided in the circuit loop of electric heating utensil
Bipolar Transistor, insulated gate bipolar transistor), and electric heater H work is controlled by it.
It should be noted that the differential mode noise of generated middle low frequency is for product during the work of electric heating utensil
There is also certain influences for the superiority and inferiority of EMC Electro Magnetic Compatibility, also do not have or have ignored for electric heating utensil in the prior art
The processing of generated differential mode noise during heating.In view of this, the application also this also disclose it is as shown in Figure 2
EMI suppression circuit, which is a kind of preferred embodiment of EMI suppression circuit shown in FIG. 1, relative to EMI shown in FIG. 1
Suppression circuit has had more the second inductance L2 and third capacitor C3, wherein the second inductance L2 is connected on the direct-flow positive pole of rectification module U
Between output end V+ and electric heater H, third capacitor C3 bridges exchange firewire input terminal and the AC neutral line input of rectification module U
End.
In the present embodiment, inductance L2 and capacitor C3 forms LC low-pass filter, can effectively filter out electric heater H and work
The differential mode noise conducted in the process improves the EMI surplus of electric heating utensil entirety；Also, by inductance L2 and capacitor C3 institute group
At low-pass filter can effectively inhibit frequency in the middle low frequency differential mode noise of 9KHz-150Khz；Further, due to the figure
EMI suppression circuit shown in 2 has beneficial effect possessed by EMI suppression circuit shown in Fig. 1, so that it is for middle low frequency differential mode
All there is good inhibiting effect with the EMI noise of high frequency common mode, improve electric heating appliance product and surveyed by EMC electromagnetic compatibility
The qualification rate of test result.
Specifically, the first inductance L1 and the second inductance L2 can be filter inductance, can generally use ferrite material
Material can be with it is also possible to can be using other materials, such as the filter inductance using common iron powder magnetic core material inductance
It is amorphous material inductance, also can also be the alloy core inductance comprising iron silicon material inductance, iron sial material inductance.And
The carrier of the EMI suppression circuit can be PCB printed circuit board.
In order to realize that the electric heating utensil for being equipped with the EMI suppression circuit can be in the environment of power frequency (50Hz) AC power source
There can be the performance of preferable EMI surplus and electromagnetism interference down, the utility model embodiment also discloses EMI suppression circuit
In each component specific type selecting parameter.First capacitor C1 and C2 are Y capacitances, and capacitance can be 100pF-4700pF with type selecting
Capacitance；And third capacitor C3 can be filter condenser, can be has more high capacitance relative to C1 and C2
Safety capacitor, such as can be 1 μ F-10 μ F, and the filter condenser can be a capacitor, be also possible to by multiple smaller
The capacitor of capacitance passes through composed by parallel connection, and when filter condenser is formed using multiple small capacitances parallel ways,
The working effect of the filter condenser can be improved more significantly.
A kind of example of DC power supply 10 of the utility model embodiment is also shown in Fig. 2, the DC power supply 10 packet
Containing electromagnetic interference EMI suppression circuit and rectification module as described in foregoing embodiments.Specifically, which can be with
It is rectifier bridge, can also be that rectifier bridge plays the additional device of rectification effect with other.And as Fig. 2 also shows a kind of electricity
Utensil 20 is heated, which includes electric heater H and DC power supply 10.Specifically, electric heater H can be electric heating
Coil panel also can also be electromagnetic heating induction coil disk or combinations thereof, and the coil-type of electric heater H, which can be, to depend on being somebody's turn to do
The heating method of electric heating utensil 20, such as when electric heating utensil 20 has electromagnetic induction heating (IH, Induction
Heating) when mode, electric heater H, which can be, selects electromagnetic heating induction coil disk.When using electric heating coil disk and/or electricity
When magnetic heating induction coil disk is as electric heater, for the ease of electric appliance internal wiring, as shown in Fig. 2, the utility model embodiment
It also proposes that PE line heated object (not shown) can be connected by the center of coil panel.
It should be noted that output power can be controlled by IGBT to electricity in the course of work of IH type electric heating utensil
Magnetic heating induction coil disk externally exports oscillator signal to form oscillating circuit；Wherein, a part of the oscillator signal is passed through
Rectifier bridge is transmitted to power interface, and another part is electrically heated utensil and picks up to form vortex, to heat inside utensil
Food；But in this heating process, there are portion of energy, and power grid can have been arrived along conducting wire reverse transfer, i.e., a part is with electricity
The form in magnetic field is radiated to space, and another part energy is conducted by the ground wire of cookware to power grid, and the above can all cause
The electric heating utensil can not cause electric heating utensil to be unable to satisfy the requirement that EMI is tested by the conduction test of high standard.
The structural schematic diagram of the electric heating utensil 20 of an embodiment of the present invention as shown in Figure 3, the electric heating utensil
20 include driving device 201, the IGBT 202 connecting with driving device 201, the electromagnetic heating line of induction connecting with IGBT 202
Enclose disk 203 and the DC power supply 10 for exporting direct current.Wherein, driving device 201 is used for output drive signal, IGBT 201
For receiving the driving signal, and the work of electromagnetic heating induction coil disk 203 and heating can be controlled according to the driving signal.
Details and effect about DC power supply 10 can refer to description above, so that 20 energy of electric heating utensil shown in Fig. 3
The high-frequency noise by PE line is enough effectively filtered out, and reduces the magnetic field strength to the electromagnetic field of external radiation, more than the EMI for improving product
Amount and anti-electromagnetic interference capability.It should be noted that the drive of the driving signal shown in Fig. 3 about IGBT and offer driving signal
Dynamic device is exemplary, IGBT be also based on other modes control electromagnetic heating induction coil disk work and heating,
And belong to the protection scope of the utility model.
The utility model embodiment one side using upper, electric heating utensil 20 can be common various electroheating types
Household electrical appliance, such as can be electric cooker, electric pressure cooking saucepan, electromagnetic oven, IH wall-breaking machine, cooking machine or insulating pot etc., and do not answer
It is considered as the limitation to scope of protection of the utility model.The utility model embodiment can especially be applied in bottom-heated type
In electric heating boilers, in these bottom-heated type electric heating boilers, heater is positioned at the bottom of electric heating boilers.It needs
Bright, in the prior art, PE line is merely able to play the role of protection, but simultaneously EMI noise also can via PE line guide or
It is transferred to power interface, the Electro Magnetic Compatibility of product is caused to reduce；Applying technology disclosed in the utility model embodiment
After scheme, so that EMI noise will not be led to power interface by electric heating utensil 20, but the noise reverse leading can be gone forward side by side
Row filters out, and thus improves the anti-electromagnetic interference capability of product.
About explanation of the implementation of the utility model embodiment in terms of economic benefits, in the EMI of current household appliances
Common mode inhibition device used in circuit design, price usually all more than a yuan, produce in components in household electrical appliances
Belong to the relatively high device of cost, and its anti-jamming effectiveness is not also significant, can not also ensure that electric heating utensil is carrying out conduction survey
EMI surplus when examination can reach test request.In contrast, the electric heating utensil 20 in the present embodiment is above-mentioned due to using
EMI Restrain measurement, under the premise of effectively inhibiting EMI noise, additionally it is possible to realize lower production cost, there is preferable market
Promotional value.
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 interference EMI suppression circuit, which is characterized in that electromagnetic interference EMI suppression circuit is used for electric heating utensil,
The electric heating utensil includes electric heater, heated object and the rectification module for electric heater power supply, the friendship of the rectification module
Filariasis line input terminal and AC neutral line input terminal are separately connected the firewire and zero curve of AC power source, for by the AC power source
Alternating current is converted to direct current and exports via the direct-flow positive pole output end of the rectification module and direct current cathode output end, Yi Jisuo
It states heated object to be connected with power ground, wherein the EMI suppression circuit includes:
First capacitor bridges the power ground and the AC neutral line input terminal；
Second capacitor bridges the power ground with described and exchanges firewire input terminal；And
First inductance is connected between the power ground and the heated object.
2. circuit according to claim 1, which is characterized in that the EMI suppression circuit further include:
Third capacitor bridges the exchange firewire input terminal and the AC neutral line input terminal of the rectification module；And
Second inductance is connected between the direct-flow positive pole output end of the rectification module and the electric heater.
3. circuit according to claim 1, which is characterized in that the first capacitor and the capacitance of second capacitor are big
Small is 100pF-4700pF.
4. circuit according to claim 2, which is characterized in that first inductance and second inductance are filtered electrical
Sense.
5. circuit according to claim 2, which is characterized in that the size of the capacitance of the third capacitor is 1 μ F-10 μ
F。
6. a kind of DC power supply characterized by comprising
Electromagnetic interference EMI suppression circuit according to any one of claims 1 to 5 for electric heating utensil；And
Rectifier bridge, the exchange firewire input terminal and AC neutral line input terminal of the rectifier bridge are separately connected the firewire and zero of AC power source
Line, for the alternating current of the AC power source to be converted to direct current and via the direct-flow positive pole output end of the rectification module and directly
Flow cathode output end output.
7. a kind of electric heating utensil characterized by comprising
Electric heater and heated object；And
DC power supply as claimed in claim 6, for powering for the electric heater.
8. electric heating utensil according to claim 7, which is characterized in that the electric heating utensil is electric cooker, wherein institute
Stating heated object is the interior pot that can contact the magnet steel of electric cooker, and the magnet steel connects power ground.
9. electric heating utensil according to claim 7, which is characterized in that the electric heater include electric heating coil disk and/
Or electromagnetic heating induction coil disk.
10. electric heating utensil according to claim 9, which is characterized in that power ground passes through the electric heating coil disk
And/or the center of the electromagnetic heating induction coil disk is connected to the heated object.
11. electric heating utensil according to claim 7, which is characterized in that the electric heating utensil includes appointing in following
Meaning one: electric cooker, electric pressure cooking saucepan, electromagnetic oven, IH wall-breaking machine or cooking machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820771973.9U CN208209815U (en) | 2018-05-22 | 2018-05-22 | Electromagnetic interference EMI suppression circuit, DC power supply and electric heating utensil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820771973.9U CN208209815U (en) | 2018-05-22 | 2018-05-22 | Electromagnetic interference EMI suppression circuit, DC power supply and electric heating utensil |
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| Publication Number | Publication Date |
|---|---|
| CN208209815U true CN208209815U (en) | 2018-12-07 |
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ID=64518425
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| CN201820771973.9U Active CN208209815U (en) | 2018-05-22 | 2018-05-22 | Electromagnetic interference EMI suppression circuit, DC power supply and electric heating utensil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022017049A1 (en) * | 2020-07-22 | 2022-01-27 | 京东方科技集团股份有限公司 | Anti-power environment suppression circuit, touch screen, and touch display device |
-
2018
- 2018-05-22 CN CN201820771973.9U patent/CN208209815U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022017049A1 (en) * | 2020-07-22 | 2022-01-27 | 京东方科技集团股份有限公司 | Anti-power environment suppression circuit, touch screen, and touch display device |
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