CN208158423U - 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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- CN208158423U CN208158423U CN201820769787.1U CN201820769787U CN208158423U CN 208158423 U CN208158423 U CN 208158423U CN 201820769787 U CN201820769787 U CN 201820769787U CN 208158423 U CN208158423 U CN 208158423U
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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.The electric heating utensil include electric heater, heated object and for electric heater power supply rectification module and heated object be connected with power ground, EMI suppression circuit includes：First capacitor bridges power ground and AC neutral line input terminal；Second capacitor, bridging power ground with exchange firewire input terminal；Third capacitor bridges the exchange firewire input terminal and AC neutral line input terminal of rectification module；First inductance, is connected between power ground and heated object；Second inductance is connected between exchange firewire input terminal and third capacitor and the tie point for exchanging firewire input terminal of rectification module；First resistor and second resistance parallel with one another is connected in the connection line of first capacitor and the second capacitor and power ground.Which thereby enhance 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 there is following defect：
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, EMC electromagnetism of the generated middle low frequency differential mode noise for product during the work of electric heating utensil
There is also certain influences for the superiority and inferiority of compatible performance, and the solution without being effectively treated for differential mode noise in the prior art
Certainly scheme.
5th, 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, the utility model embodiment provides a kind of electromagnetic interference EMI for electric heating utensil
Suppression circuit, the electric heating utensil include electric heater, heated object and the rectification module for electric heater power supply, the rectification mould
The exchange firewire input terminal and AC neutral line input terminal of block are separately connected the firewire and zero curve of AC power source, are used for the exchange
The alternating current of power supply 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,
And the heated object is connected with power ground, wherein the EMI suppression circuit includes：First capacitor bridges the electricity
Source ground wire and the AC neutral line input terminal；Second capacitor bridges the power ground with described and exchanges firewire input terminal；The
Three capacitors bridge the exchange firewire input terminal and the AC neutral line input terminal of the rectification module；First inductance,
It is connected between the power ground and the heated object；Second inductance is connected on the exchange of the rectification module
Between firewire input terminal and the third capacitor and the tie point for exchanging firewire input terminal；First resistor and second resistance,
It is parallel with one another, the first resistor parallel with one another and second resistance be connected on the first capacitor and second capacitor with it is described
In the connection line of power ground.
Optionally, the carrier of the EMI suppression circuit is PCB printed circuit board.
Optionally, first inductance and second inductance are filter inductance.
Specifically, the first capacitor and the capacitance size of second capacitor are 100pF-4700pF and described
The size of the capacitance of 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, with bridging power ground with exchange the second capacitor of firewire input terminal, and be connected on power ground and heated object
Between the first inductance, and form low pass RLC filter together with the concatenated parallel resistance of shunt capacitance, Novel electric can be added
Hot utensil during the work time caused by high frequency common mode noise from power interface reverse leading to EMI suppression circuit, and by its
It filters out, efficiently solves the problems, such as that common mode conducts exceeded and EMI surplus deficiency, ensured that electric heating utensil can be surveyed by conduction
Examination；Also, the exchange firewire input terminal by being connected on rectification module and third capacitor and the tie point for exchanging firewire input terminal
Between the second inductance, with bridging rectification module exchange firewire input terminal and AC neutral line input terminal third capacitor together with group
At low pass LC filter, can by electric heating utensil during heating caused by the differential mode noise of low frequency also filter out；
It works along both lines as a result, efficiently solves the problems, such as that common mode, differential mode conduct exceeded, EMI surplus deficiency, ensured electric heating utensil
Conduction test can be passed through；Also, selected electronic component is low in cost in the EMI suppression circuit, thermal losses is low and accounts for
With small in size, which is promoted and applied in various electric heating utensils.
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, on the other hand the utility model embodiment provides a kind of DC power supply, including above-mentioned
Electromagnetic interference EMI suppression circuit for electric heating utensil；And rectifier bridge, the exchange firewire input terminal of the rectifier bridge with exchange
Zero curve input terminal 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 it is exported via the direct-flow positive pole output end of the rectification module and direct current cathode output end.
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 another aspect of the utility model embodiment provides a kind of electric heating utensil, including：Electric heating
Device and heated object；And above-mentioned DC power supply, for powering for the electric heater.
Specifically, the electric heater includes electric heating coil disk and/or electromagnetic heating induction coil disk.
Optionally, the electric heating utensil includes that the electric heating boilers of bottom-heated type and the electric heater are located at institute
State the bottom of electric heating boilers.
Optionally, the electric heating appliance hole and power ground connect the heated object by described hole.
Optionally, the electric heating utensil includes any one in following：Electric cooker, electric pressure cooking saucepan, IH broken wall are mechanical, electrical
Magnetic furnace 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 that the structure of the EMI suppression circuit of an embodiment of the present invention connects schematic diagram；
Fig. 2 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
R1, R2 resistance 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, first
Inductance L1, first resistor R1 and second resistance R2.Wherein the EMI suppression circuit is associated with setting with rectification module U and electric heater H,
The exchange firewire input terminal and AC neutral line input terminal of rectification module U are separately connected the firewire and zero curve of AC power source, are used for
The alternating current of the AC power source is converted into direct current；And rectification module U is used to power for electric heater H, the electric heater
H is used to provide heat for heated object B.It should be noted that the heating type of electric heater H can be direct current electric heating type (such as
Directly powered by the positive and negative anodes output end of rectification module), be also possible to AC electric-heating type (such as rectification module output end warp
Implement inversion driving power supply indirectly by such as IGBT), and belong to the protection scope of the utility model.In addition, this is heated
The type of body B can be it is diversified, can be it is corresponding with the type of electric heating utensil, such as when electric heating utensil be electricity
When pressure cooker, which can 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
Power ground (i.e. PE line) ground connection, to be grounded, thereby eliminating heated object may be asked by the caused safety of people's touching
Topic, such as when electric heater is located at the bottom of heating utensil (such as cookware), which can be the bottom from the heating utensil
Portion (such as the bottom of a pan) is drawn, and specifically be can be electric heater and is provided with hole, and power ground connects heated object by hole, with
Optimize wiring space.It is illustrated by taking electric cooker as an example, 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, can be first capacitor C1 both ends bridge respectively PE line and
The AC neutral line input terminal of rectification module U；Second capacitor C2 bridging PE line exchanges firewire input terminal with rectification module U's；And
First inductance L1 is connected between PE line and heated object B, and wherein inductance L1 should not relative to the link position of capacitor C1 and C2
It limits, can be the side as shown in Figure 1 in capacitor C1 and C2, also can also be and be connected to ((not shown)) C1 and C2
Between etc.；First resistor R1 and second resistance R2 is parallel resistance pair, and the parallel resistance is to being connected on first capacitor C1 and second
In the connection line of capacitor C2 and power ground PE.RLC is formed together with as a result, by C1, C2, L1 and parallel resistance to R1 and R2
Low-pass filter can effectively filter out the common-mode noise sensed on PE line, more particularly to frequency 150KHz-30Mhz's
High frequency common mode noise has outstanding inhibiting effect.
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, EMI suppression circuit as shown in Figure 1 also discloses the technical solution for inhibiting differential mode noise, it is specific to go back
Comprising the second inductance L2 and third capacitor C3, wherein third capacitor C3 bridge the exchange firewire input terminal of rectification module U with exchange
Zero curve input terminal, the second inductance L2 be connected on rectification module U exchange firewire input terminal and third capacitor C3 with to exchange firewire defeated
Enter between the tie point at end.Inductance L2 and capacitor C3 forms LC low-pass filter as a result, can effectively filter out electric heater H in work
The differential mode noise conducted during work improves the EMI surplus of electric heating utensil entirety；Also, by inductance L2 and capacitor C3 institute
The low-pass filter of composition can effectively inhibit frequency in the middle low frequency differential mode noise of 9KHz-150Khz；The utility model as a result,
EMI suppression circuit provided by embodiment all there is good inhibition to make the EMI noise of middle low frequency differential mode and high frequency common mode
With improving electric heating appliance product and pass through the qualification rate of EMC electromagnetic compatibility 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.About the type selecting of first resistor and second resistance, can be
Select strong antijamming capability, the good Chip-R of high frequency characteristics.
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.
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
Under can have preferable EMI surplus and anti-electromagnetic interference capability, the utility model embodiment also discloses in EMI suppression circuit
The specific type selecting parameter of each component.First capacitor C1 and the second capacitor C2 is Y capacitance, and capacitance can be 100pF- with type selecting
The capacitance of 4700pF；And third capacitor C3 can be filter condenser, can be has bigger electricity relative to C1 and C2
The safety capacitor of capacity, such as can be 1 μ F-10 μ F, and the filter condenser can be a capacitor, be also possible to by more
The capacitor of a more small capacitances amount passes through composed by parallel connection, and when filter condenser is formed using multiple small capacitances parallel ways
When, it can more significantly improve the working effect of the filter condenser.
A kind of example of DC power supply 10 of the utility model embodiment is also shown in Fig. 1, the DC power supply 10 packet
Containing the electromagnetic interference EMI suppression circuit as described in foregoing embodiments and rectification module U.Specifically, rectification module U can
To be rectifier bridge, it can also be that rectifier bridge plays the additional device of rectification effect with other.And as Fig. 1 also shows one kind
Electric heating utensil 20, the electric heating utensil 20 include electric heater H and DC power supply 10.Specifically, electric heater H can be electricity and add
Heat coil disk also can also be electromagnetic heating induction coil disk or combinations thereof, and the coil-type of electric heater H, which can be, to be depended on
The heating method of the 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, the utility model embodiment also proposes can be with
PE line is connected into heated object (not shown) by the center of coil panel.
It should be noted that IGBT (Insulated Gate can be passed through in the course of work of IH type electric heating utensil
Bipolar Transistor, insulated gate bipolar transistor) output power is controlled to electromagnetic heating induction coil disk to be formed
Oscillating circuit, and externally export oscillator signal；Wherein, a part of the oscillator signal is transmitted by rectifier bridge to power interface,
And another part is electrically heated utensil and picks up to form vortex, to heat the food inside utensil；But in this heating process
In, there are portion of energy, and power grid can have been arrived along conducting wire reverse transfer, i.e., a part is radiated in the form of electromagnetic field to space, separately
Part energy is conducted by the ground wire of cookware to power grid, and the above can all cause the electric heating utensil that can not pass through high standard
Quasi- conduction test, and electric heating utensil is caused to be unable to satisfy the requirement that EMI is tested.
The structural schematic diagram of the electric heating utensil 20 of an embodiment of the present invention as shown in Figure 2, 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. 2
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. 2 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 various electroheating type household electrics
Device, such as can be electric cooker, electric pressure cooking saucepan, electromagnetic oven, IH wall-breaking machine, cooking machine or insulating pot etc..The utility model is real
Applying example especially can be applied in the electric heating boilers of bottom-heated type, in these bottom-heated type electric heating boilers, add
Hot device is positioned at the bottom of electric heating boilers.It should be noted that in the prior art, PE line is merely able to play the work of protection
With, but EMI noise also can guide via PE line or be transferred to power interface simultaneously, and the Electro Magnetic Compatibility of product is caused to reduce；?
After applying technical solution disclosed in the utility model embodiment, so that electric heating utensil 20 will not lead to EMI noise
Power interface, but by the noise reverse leading and can filter out, thus improve 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 (10)
1. a kind of electromagnetic interference EMI suppression circuit for electric heating utensil, which is characterized in that the electric heating utensil includes electric heating
Device, heated object and the rectification module for electric heater power supply, the exchange firewire input terminal and AC neutral line of the rectification module
Input terminal 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 is passed through
By direct-flow positive pole output end and direct current the cathode output end output of the rectification module and the heated object and power ground phase
Connection, 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；
Third capacitor bridges the exchange firewire input terminal and the AC neutral line input terminal of the rectification module；
First inductance is connected between the power ground and the heated object；
Second inductance, the exchange firewire input terminal and the third capacitor for being connected on the rectification module are exchanged with described
Between the tie point of firewire input terminal；
First resistor and second resistance, parallel with one another, the first resistor parallel with one another and second resistance are connected on described first
In the connection line of capacitor and second capacitor and the power ground.
2. circuit according to claim 1, which is characterized in that the carrier of the EMI suppression circuit is PCB printed circuit
Plate.
3. circuit according to claim 1, which is characterized in that first inductance and second inductance are filtered electrical
Sense.
4. circuit according to claim 1, which is characterized in that the first capacitor and the capacitance of second capacitor are big
It is small be the capacitance of 100pF-4700pF and the third capacitor size be 1 μ F-10 μ F.
5. a kind of DC power supply, which is characterized in that including：
Such as the electromagnetic interference EMI suppression circuit of any of claims 1-4 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.
6. a kind of electric heating utensil, which is characterized in that including：
Electric heater and heated object；And
DC power supply as claimed in claim 5, for powering for the electric heater.
7. electric heating utensil according to claim 6, which is characterized in that the electric heater include electric heating coil disk and/
Or electromagnetic heating induction coil disk.
8. electric heating utensil according to claim 7, which is characterized in that the electric heating utensil includes bottom-heated type
Electric heating boilers and the electric heater are located at the bottom of the electric heating boilers.
9. electric heating utensil according to claim 8, which is characterized in that the electric heating appliance hole and power ground
Line connects the heated object by described hole.
10. 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, IH wall-breaking machine, electromagnetic oven or cooking machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820769787.1U CN208158423U (en) | 2018-05-22 | 2018-05-22 | Electromagnetic interference EMI suppression circuit, DC power supply and electric heating utensil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820769787.1U CN208158423U (en) | 2018-05-22 | 2018-05-22 | Electromagnetic interference EMI suppression circuit, DC power supply and electric heating utensil |
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| CN208158423U true CN208158423U (en) | 2018-11-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112737A (en) * | 2019-06-03 | 2019-08-09 | 珠海格力电器股份有限公司 | Reduce the filter circuit and filtering method of the AC network of earth leakage current |
-
2018
- 2018-05-22 CN CN201820769787.1U patent/CN208158423U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112737A (en) * | 2019-06-03 | 2019-08-09 | 珠海格力电器股份有限公司 | Reduce the filter circuit and filtering method of the AC network of earth leakage current |
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