CN108307552A - Reduce device and method, the cooking apparatus of electromagnetic noise - Google Patents
Reduce device and method, the cooking apparatus of electromagnetic noise Download PDFInfo
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- CN108307552A CN108307552A CN201710017789.5A CN201710017789A CN108307552A CN 108307552 A CN108307552 A CN 108307552A CN 201710017789 A CN201710017789 A CN 201710017789A CN 108307552 A CN108307552 A CN 108307552A
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- voltage
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- electromagnetic noise
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Induction Heating Cooking Devices (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The present invention provides a kind of device and method, cooking apparatus reducing electromagnetic noise, wherein the method for reducing electromagnetic noise includes：Voltage in each half-wave after full-wave rectification is detected at times；If the voltage in any time period is more than default chopping voltage, the voltage is modulated so that the envelope size of the modulated half-wave is constant, and the voltage of each period in the half-wave is both less than equal to the default chopping voltage.Technical solution through the invention can reduce concussion crest voltage, to reduce the electromagnetic noise mainly brought by crest voltage, to improve the usage experience of user by the modulation to voltage.
Description
Technical field
The present invention relates to Electromagnetic Treatment fields, in particular to a kind of device reducing electromagnetic noise, a kind of reduction electricity
The method of magnetic noise and a kind of cooking apparatus.
Background technology
As electromagnetic technique is more and more universal, such as electromagnetic oven, IH electric cookers (Induction Heater electric cookers, inductance
Heating electric rice cooker) etc., in these electromagnetic appliance products, because electromagnetic heating needs ceaselessly switch IGBT (Insulated
Gate Bipolar Transistor, insulated gate bipolar transistor), while alternating current, mains harmonics and circuit are to alternating current
Interference and its fluctuation of alternating current itself all can send out corresponding electromagnetic noise under high-power heating to electric appliance effect,
This electromagnetic noise is especially ear-piercing, and main frequency range is that 100Hz to 600Hz is differed, buzz, the squeak of this noise generation,
Seriously affect the usage experience of client.
Therefore, how electromagnetic noise is reduced, the usage experience to improve user becomes urgent problem to be solved.
Invention content
The present invention is directed at least solve one of above-mentioned technical problems existing in the prior art or related technologies.
For this purpose, an object of the present invention is to provide a kind of methods reducing electromagnetic noise.
It is another object of the present invention to provide a kind of devices reducing electromagnetic noise.
It is yet a further object of the present invention to provide a kind of cooking apparatus.
The first aspect of the present invention proposes a kind of method reducing electromagnetic noise, including：For every after full-wave rectification
Voltage in a half-wave is detected at times；If the voltage in any time period is more than default chopping voltage, to above-mentioned electricity
Pressure is modulated so that the envelope size of modulated above-mentioned half-wave is constant, and the voltage of each period in above-mentioned half-wave
Both less than it is equal to above-mentioned default chopping voltage.
The method of the reduction electromagnetic noise proposed according to the first aspect of the invention carries out rectification to the all-wave of alternating current,
If the half-wave voltage after rectification is more than preset chopping voltage, half-wave voltage is modulated at times, makes the envelope of half-wave
Area is constant, that is, ensures that power is constant.The process of modulation will also ensure that the voltage of any time period in half-wave is both less than equal to
Preset chopping voltage.In this way, the crest voltage in concussion waveform voltage just forces down under chopping voltage, due to low-voltage
In frequency spectrum, the gain of low-frequency range is relatively low compared with the low-band gain of the voltage before modulation, and the gain of low-frequency range is electricity
The main source of magnetic noise, so electromagnetic noise can be reduced by forcing down the crest voltage of concussion waveform, to improve the use of user
Experience.
In the above-mentioned technical solutions, it is preferable that the voltage in above-mentioned each half-wave for after full-wave rectification carries out timesharing
Section detection specifically includes：Using the maximum value of above-mentioned half-wave as axis, each above-mentioned half-wave symmetry is divided into the even number period；It checks
Voltage value in each above-mentioned period.
In the technical scheme, the period of half-wave voltage is divided into the even number period, and symmetrically divided, to locate
The modulation rule of PWM (pulse width modulation, pulse width modulation) is utilized during reason.Because of the modulation of PWM
Mode defers to certain rule in modulated process, opposite cycle sequences is used within the symmetrical period, in this way, in first half
Part increases when being adjusted to the duty ratio of PWM if it is by duty ratio coefficient, then latter half will be to the duty ratio of PWM
Reduced.To while reaching reduction concussion crest voltage, the envelope size of half-wave be made constant.
In the above-mentioned technical solutions, it is preferable that above-mentioned voltage is modulated and is specifically included：By changing each period
The duty ratio of pulsewidth modulation is modulated the above-mentioned voltage of each period, wherein in the voltage ascent stage of above-mentioned half-wave,
Since the initial duty cycle of the first period, the above-mentioned duty ratio of each period is reduced with the rising of voltage, until modulation
When voltage afterwards is equal with default chopping voltage, above-mentioned duty ratio is no longer reduced；In the voltage decline stage of above-mentioned half-wave, each
The above-mentioned duty ratio of period increases with the decline of voltage.
In the technical scheme, during to the ascent stage voltage modulated of half-wave, from the duty ratio to the first period
Adjusting start, the duty ratio of each period increases with voltage and is reduced, so as to ensure that modulated voltage is less than copped wave
Voltage, and duty ratio no longer reduces when modulation voltage is equal to chopping voltage, the voltage of half-wave decline stage and ascent stage
Voltage is symmetric relation, therefore the adjusting of duty ratio is to decline with voltage and increase.The variation of duty cycle adjustment can will shake
While swinging crest voltage and be reduced to chopping voltage or less, keep the envelope size of half-wave constant, that is, ensures that power is constant.
In the above-mentioned technical solutions, it is preferable that the method for above-mentioned reduction electromagnetic noise further includes：It calculates modulated
The power of each half-wave；Above-mentioned power is compared with target power, and according to comparison result, determines the first of next half-wave
The initial duty cycle of period.
In the technical scheme, the power of modulated half-wave is calculated, is carried out with the target power of electromagnetic equipment
Compare, according to comparison result, determines the first period duty ratio of next half-wave, modulated power and target power one can be made
It causes, to ensure that while reducing electromagnetic noise, the output power of electromagnetic equipment will not be reduced.
In the above-mentioned technical solutions, it is preferable that the method for above-mentioned reduction electromagnetic noise is specifically used for, when above-mentioned power is big
When above-mentioned target power, above-mentioned initial duty cycle is reduced；And when above-mentioned power is less than or equal to above-mentioned target power, increase
Above-mentioned initial duty cycle.
In the technical scheme, when being compared to modulated power and target power, if modulated power is small
In target power, then the duty ratio of first PWM of next half-wave is increased, if it is greater than target power, then reduces next half-wave
One PWM duty cycle reaches the power requirement of demand until modulated power is consistent with target power, modulated in this way
Power and target power can be consistent, to ensure that while reducing electromagnetic noise, the defeated of electromagnetic equipment will not be reduced
Go out power.
In the above-mentioned technical solutions, it is preferable that above-mentioned default chopping voltage, according to heating power, present operating voltage and
One or more of cookware type determines.
In the technical scheme, pass through one or more of heating power, present operating voltage and cookware type factor
It determines default chopping voltage, default chopping voltage can be determined for current operating mode, and then can be in varied situations
The electromagnetic noise of electromagnetic equipment is reduced, the reliability reduced to electromagnetic noise is improved.
The second aspect of the present invention provides a kind of device reducing electromagnetic noise, including：Segmenting unit, to full-wave rectification
The voltage in each half-wave afterwards is detected at times；Modulation unit, if the voltage in any time period is more than default copped wave
Voltage is then modulated above-mentioned voltage so that the envelope size of modulated above-mentioned half-wave is constant, and in above-mentioned half-wave
The voltage of each period is both less than equal to above-mentioned default chopping voltage.
The device of the reduction electromagnetic noise proposed according to a second aspect of the present invention, segmenting unit carry out the all-wave of alternating current
Rectification, if the half-wave voltage after rectification is more than preset chopping voltage, modulation unit modulates half-wave voltage at times,
Keep the envelope size of half-wave constant, that is, ensures that power is constant.During modulation, modulation unit will also ensure to appoint in half-wave
The voltage of one period is both less than equal to preset chopping voltage.In this way, the crest voltage in concussion waveform voltage is just forced down and is being cut
Under wave voltage, since in the frequency spectrum of low-voltage, the gain of low-frequency range is opposite compared with the low-band gain of the voltage before modulation
It is relatively low, and the gain of low-frequency range is the main source of electromagnetic noise, so electricity can be reduced by forcing down the crest voltage of concussion waveform
Magnetic noise, to improve the usage experience of user.
In the above-mentioned technical solutions, it is preferable that above-mentioned segmenting unit is specifically used for：Using the maximum value of above-mentioned half-wave as axis,
Each above-mentioned half-wave symmetry is divided into the even number period；Check the voltage value in each above-mentioned period.
In the technical scheme, the period of half-wave voltage is divided into the even number period by segmenting unit, and is symmetrically divided,
So that the modulation rule of PWM (pulse width modulation, pulse width modulation) can be utilized in processing procedure.Cause
For PWM modulation system in modulated process, defer to certain rule, within the symmetrical period use opposite cycle sequences,
In this way, increasing if it is by duty ratio coefficient when first half is adjusted the duty ratio of PWM, then latter half will be right
The duty ratio of PWM is reduced.To while reaching reduction concussion crest voltage, the envelope size of half-wave be made constant.
In the above-mentioned technical solutions, it is preferable that above-mentioned modulation unit is specifically used for：By the pulsewidth tune for changing each period
The duty ratio of system is modulated the above-mentioned voltage of each period, wherein in the voltage ascent stage of above-mentioned half-wave, from first
The initial duty cycle of period starts, and the above-mentioned duty ratio of each period is reduced with the rising of voltage, until modulated electricity
When pressure is equal with default chopping voltage, above-mentioned duty ratio is no longer reduced；In the voltage decline stage of above-mentioned half-wave, each period
Above-mentioned duty ratio increases with the decline of voltage.
In the technical scheme, modulation unit is during to the ascent stage voltage modulated of half-wave, to the first period
The adjusting of duty ratio start, the duty ratio of each period increases with voltage and is reduced, so as to ensure modulated voltage
Less than chopping voltage, and duty ratio no longer reduces when modulation voltage is equal to chopping voltage, the voltage of half-wave decline stage with it is upper
The voltage in the stage of liter is symmetric relation, therefore the adjusting of duty ratio is to decline with voltage and increase.The variation of duty cycle adjustment, energy
It is enough while will shake crest voltage and be reduced to chopping voltage or less, keep the envelope size of half-wave constant, that is, ensure work(
Rate is constant.
In the above-mentioned technical solutions, it is preferable that the device of above-mentioned reduction electromagnetic noise further includes：Computing unit calculates
The power of modulated each half-wave；Above-mentioned power is compared by comparing unit with target power, and according to comparison result,
Determine the initial duty cycle of the first period of next half-wave.
In the technical scheme, after computing unit calculates the power of modulated half-wave, comparing unit will just be adjusted
Power after system is compared with the target power of electromagnetic equipment, according to comparison result, determines that the first period of next half-wave accounts for
Empty ratio, can make modulated power consistent with target power, to ensure that while reducing electromagnetic noise, electricity will not be reduced
The output power of magnetic machine.
In the above-mentioned technical solutions, it is preferable that the device of above-mentioned reduction electromagnetic noise is specifically used for：When above-mentioned power is big
When above-mentioned target power, above-mentioned initial duty cycle is reduced；And when above-mentioned power is less than or equal to above-mentioned target power, increase
In addition stating initial duty cycle.
In the technical scheme, when being compared to modulated power and target power, if modulated power is small
In target power, then the duty ratio of first PWM of next half-wave is increased, if it is greater than target power, then reduces next half-wave
One PWM duty cycle reaches the power requirement of demand until modulated power is consistent with target power, modulated in this way
Power and target power can be consistent, to ensure that while reducing electromagnetic noise, the defeated of electromagnetic equipment will not be reduced
Go out power.
In the above-mentioned technical solutions, it is preferable that above-mentioned default chopping voltage, according to heating power, present operating voltage and
One or more of cookware type determines.
In the technical scheme, pass through one or more of heating power, present operating voltage and cookware type factor
It determines default chopping voltage, default chopping voltage can be determined for current operating mode, and then can be in varied situations
The electromagnetic noise of electromagnetic equipment is reduced, the reliability reduced to electromagnetic noise is improved.
The third aspect of the present invention provides a kind of cooking apparatus, includes the reduction electromagnetism proposed such as second aspect of the present invention
The device of noise, therefore, the cooking apparatus that third aspect present invention proposes, the reduction electromagnetism proposed with second aspect of the present invention
Whole advantageous effects of the device of noise, details are not described herein.
Wherein, above-mentioned cooking apparatus can be electromagnetic oven, IH electric cookers, electric pressure cooking saucepan, or other kinds of electricity
Magnetic heating equipment.
Technical solution through the invention modulates the half-wave after rectification at times, reduces concussion half-wave voltage
Crest voltage ensures that output power is constant under chopping voltage.Since modulated low-voltage is in the gain of low-frequency range
Become smaller, because the electromagnetic noise that the gain of low-frequency range generates also becomes smaller therewith, to reduce electromagnetic noise, improves the use of user
Experience.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein：
Fig. 1 shows the flow chart of the method for the reduction electromagnetic noise of embodiment according to a first aspect of the present invention；
Fig. 2 shows the block diagrams of the device of the reduction electromagnetic noise of embodiment according to a second aspect of the present invention；
Fig. 3 shows the schematic block diagram of cooking apparatus according to the ... of the embodiment of the present invention；
Fig. 4 shows the schematic diagram that crest voltage according to the ... of the embodiment of the present invention is adjusted；
Fig. 5 shows the schematic diagram according to the ... of the embodiment of the present invention to rectified voltage at times；
Fig. 6 shows the flow chart according to the ... of the embodiment of the present invention for adjusting concussion crest voltage；
Fig. 7 shows the schematic diagram of voltage spectrum comparison according to the ... of the embodiment of the present invention.
Specific implementation mode
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention can also
Enough implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Fig. 1 shows the flow chart of the method for the reduction electromagnetic noise of embodiment according to a first aspect of the present invention.
As shown in Figure 1, first aspect present invention embodiment proposes a kind of method reducing electromagnetic noise, including：Step
S102 detects the voltage in each half-wave after full-wave rectification at times；Step S104, if in any time period
Voltage is more than default chopping voltage, then is modulated to above-mentioned voltage so that and the envelope size of modulated above-mentioned half-wave is constant,
And the voltage of each period in above-mentioned half-wave is both less than equal to above-mentioned default chopping voltage.
In step s 102, using the maximum value of above-mentioned half-wave as axis, the period of half-wave voltage is divided into the even number period,
And it symmetrically divides, while checking the voltage value in each above-mentioned period, to utilize PWM (pulse in processing procedure
Width modulation, pulse width modulation) modulation rule.Because the modulation system of PWM defers to one in modulated process
Fixed rule uses opposite cycle sequences, in this way, being adjusted to the duty ratio of PWM in first half within the symmetrical period
Increase if it is by duty ratio coefficient when whole, then latter half will reduce the duty ratio of PWM.To reach reduction
While shaking crest voltage, the envelope size of half-wave can be made constant, that is, ensure that the output power of electromagnetic equipment is constant.
In step S104, by change each period pulsewidth modulation duty ratio come the above-mentioned voltage to each period
It is modulated, during to the ascent stage voltage modulated of half-wave, since the adjusting to the duty ratio of the first period, each
The duty ratio of period increases with voltage and is reduced, and so as to ensure that modulated voltage is less than chopping voltage, and modulates electricity
Duty ratio no longer reduces when pressure is equal to chopping voltage, and the voltage of half-wave decline stage and the voltage of ascent stage are symmetric relations,
Therefore the adjusting of duty ratio is to decline with voltage and increase.The variation of duty cycle adjustment can will shake crest voltage reduction
While below to chopping voltage, keep the envelope size of half-wave constant, that is, ensures that power is constant.
After being modulated to half-wave, the power of modulated half-wave is calculated, the target power with electromagnetic equipment
It is compared, according to comparison result, the first period duty ratio of next half-wave is determined, specifically, if modulated power is small
In target power, then the duty ratio of first PWM of next half-wave is increased, if it is greater than target power, then reduces next half-wave
One PWM duty cycle reaches the power requirement of demand until modulated power is consistent with target power, modulated in this way
Power and target power can be consistent, to ensure that while reducing electromagnetic noise, the defeated of electromagnetic equipment will not be reduced
Go out power.
Preferably, above-mentioned default chopping voltage, according to one in heating power, present operating voltage and cookware type or
It is multiple to determine.By one or more of heating power, present operating voltage and cookware type because usually determining default cut
Wave voltage can determine default chopping voltage for current operating mode, and then can reduce electromagnetic equipment in varied situations
Electromagnetic noise, improve the reliability that is reduced to electromagnetic noise.
According to above-mentioned steps, rectification is carried out to the all-wave of alternating current, if the half-wave voltage after rectification is more than preset cut
Wave voltage modulates half-wave voltage, keeps the envelope size of half-wave constant at times, that is, ensures that power is constant.Modulation
Process also to ensure any time period in half-wave voltage both less than be equal to preset chopping voltage.In this way, concussion waveform voltage
In crest voltage just force down under chopping voltage, due in the frequency spectrum of low-voltage, the gain of low-frequency range and the electricity before modulation
The low-band gain of pressure is compared to relatively low, and the gain of low-frequency range is the main source of electromagnetic noise, so forcing down Sasser
The crest voltage of shape can reduce electromagnetic noise, to improve the usage experience of user.
Fig. 2 shows the block diagrams of the device of the reduction electromagnetic noise of embodiment according to a second aspect of the present invention.
As shown in Fig. 2, the device 200 for the reduction electromagnetic noise that the second aspect of the present invention provides, including：Segmenting unit
202, the voltage in each half-wave after full-wave rectification is detected at times；Modulation unit 204, if in any time period
Voltage is more than default chopping voltage, then is modulated to above-mentioned voltage so that and the envelope size of modulated above-mentioned half-wave is constant,
And the voltage of each period in above-mentioned half-wave is both less than equal to above-mentioned default chopping voltage.
Wherein, segmenting unit 202 is using the maximum value of above-mentioned half-wave as axis, when the period of half-wave voltage is divided into even number
Section, and symmetrically divide, while checking the voltage value in each above-mentioned period, to utilize PWM's in processing procedure
Modulate rule.Because the modulation system of PWM in modulated process, defers to certain rule, using opposite within the symmetrical period
Cycle sequences, in this way, increase if it is by duty ratio coefficient when first half is adjusted the duty ratio of PWM, then after
Half part will reduce the duty ratio of PWM.To which while reaching reduction concussion crest voltage, half-wave can be made
Envelope size is constant.
In addition, modulation unit 204 by change each period pulsewidth modulation duty ratio come above-mentioned to each period
Voltage is modulated, wherein modulation unit 204 is during to the ascent stage voltage modulated of half-wave, to the first period
The adjusting of duty ratio starts, and the duty ratio of each period increases with voltage and reduced, so as to ensure that modulated voltage is small
In chopping voltage, and duty ratio no longer reduces when modulation voltage is equal to chopping voltage, the voltage of half-wave decline stage and rising
The voltage in stage is symmetric relation, therefore the adjusting of duty ratio is to decline with voltage and increase.The variation of duty cycle adjustment, can
While will shake crest voltage and be reduced to chopping voltage or less, keep the envelope size of half-wave constant, that is, ensure power
It is constant.
In addition to this, the device 200 for reducing electromagnetic noise further includes computing unit 206 and comparing unit 208, computing unit
206 power for calculating modulated each half-wave；Comparing unit 208 is for comparing above-mentioned power with target power
Compared with, and according to comparison result, determine the initial duty cycle of the first period of next half-wave.Computing unit 206 is to modulated half
After the power of wave is calculated, modulated power is just compared by comparing unit 208 with the target power of electromagnetic equipment, root
According to comparison result, the first period duty ratio of next half-wave is determined, specifically, comparing unit 208 is to modulated power and mesh
When mark power is compared, if modulated power is less than target power, the duty of first PWM of next half-wave is increased
Than if it is greater than target power, then reducing first PWM duty cycle of next half-wave, until modulated power and target power
Unanimously, the power requirement for reaching demand, this makes it possible to keep modulated power consistent with target power, to ensure to reduce
While electromagnetic noise, the output power of electromagnetic equipment will not be reduced.
According in the device 200 for reducing electromagnetic noise, the rectification that segmenting unit 202 carries out the all-wave of alternating current, if
Half-wave voltage after rectification is more than preset chopping voltage, and modulation unit 204 just modulates half-wave voltage at times, makes half
The envelope size of wave is constant, that is, ensures that power is constant.During modulation, modulation unit 204 will also ensure to appoint in half-wave
The voltage of one period is both less than equal to preset chopping voltage.In this way, the crest voltage in concussion waveform voltage is just forced down and is being cut
Under wave voltage, since in the frequency spectrum of low-voltage, the gain of low-frequency range is opposite compared with the low-band gain of the voltage before modulation
It is relatively low, and the gain of low-frequency range is the main source of electromagnetic noise, so electricity can be reduced by forcing down the crest voltage of concussion waveform
Magnetic noise, to improve the usage experience of user.In addition, computing unit 206 and comparing unit 208 are to modulated each half-wave
Power is calculated, and modulated power is compared with target power, according to comparison result, determines the of next half-wave
The initial duty cycle of one period.This makes it possible to keep modulated power consistent with target power, to ensure to reduce electromagnetism
While noise, the output power of electromagnetic equipment will not be reduced.
Wherein, default chopping voltage is according to one or more of heating power, present operating voltage and cookware type
Come what is determined.By one or more of heating power, present operating voltage and cookware type because usually determining default copped wave
Voltage can determine default chopping voltage for current operating mode, and then can reduce electromagnetic equipment in varied situations
Electromagnetic noise improves the reliability reduced to electromagnetic noise.
Fig. 3 shows the schematic block diagram of cooking apparatus according to the ... of the embodiment of the present invention.
As shown in figure 3, cooking apparatus 300 according to the ... of the embodiment of the present invention, including reduction electromagnetic noise as shown in Figure 2
Device 200, therefore, cooking apparatus 300 have the whole advantageous effects for the device 200 for reducing electromagnetic noise, and details are not described herein.
Wherein, cooking apparatus 300 can be electromagnetic oven, IH electric cookers, electric pressure cooking saucepan, or other kinds of electromagnetism
Heating equipment.
Fig. 4 shows the schematic diagram that crest voltage according to the ... of the embodiment of the present invention is adjusted.
As shown in figure 4, to after rectification half-wave voltage (3) or the half-wave voltage (4) after copped wave is modulated, by half-wave
Concussion crest voltage is forced down, while ensureing that its envelope size is constant, also means that power is constant, expands both sides voltage amplitude
Value, voltage (3) and voltage (4) are forced down under chopping voltage value (5.1), are formed voltage (5), are exactly modulated voltage,
Realize the adjusting to crest voltage.
Fig. 5 shows the schematic diagram according to the ... of the embodiment of the present invention to rectified voltage at times.
As shown in figure 5, voltage waveform (5) is from waveform (5.2) transformation, therefore voltage waveform (5.2) is divided into idol
Several periods are divided into 6 periods, respectively period (5.3), (5.4), (5.5), (5.6), (5.7), (5.8) herein, right
Each period is accurately controlled so that meet power it is constant under conditions of, the waveform (5.2) of IGBT-Vc is transformed to wave
Shape (5).
Fig. 6 shows the flow chart according to the ... of the embodiment of the present invention for adjusting concussion crest voltage.
As shown in fig. 6, by taking cooking apparatus as an example, the adjusting to shaking crest voltage illustrates.First in step S602
In, current voltage is detected, step S604 judges whether zero crossing enters step to voltage value if voltage value zero crossing
Rapid S606 adjusts the period 5.3 according to current voltage the duty ratio of PWM, powers to cooking apparatus, realizes heating；According to step
S608 adjusts the period 5.4 according to current voltage the duty ratio of PWM, then in step S610 and step S612, according to day part
Current voltage and chopping voltage the duty ratio of PWM is adjusted to period 5.5 and period 5.6 respectively, then in step S614
In step S616, it is adjusted the duty ratio of PWM to period 5.7 and period 5.8 respectively according to the current voltage of day part, it is real
Now to the power supply of cooking apparatus, heated.After period 5.8, into next half wave cycles, step S618 detects voltage over zero
When, according to upper half wave cycles electric current and current voltage, with the relationship of target power and upper half wave cycles power, to the half-wave
Corresponding period 5.3 to the period 5.8 carries out the processing of same rule in period.In step S620, carried out pair with this rule
The power supply to cooking apparatus is realized in the modulation in next period, realizes heating process.
In above-mentioned steps, to the process of the specific adjustment PWM of each period, the duty ratio for adjusting PWM needs basis
Different capacity requires and different voltages have different regulative modes, but rule is consistent.Herein with for 2kW power,
For the cooking apparatus of 220V voltages, illustrate concrete processing procedure.Assuming that 5.3 first PWM duty cycles of period are N (30%<N<
70%, 15kHz<Frequency<30kHz), then the duty ratio of the subsequent each PWM of period 5.3 be multiplied by coefficient L (<0.5<L<1), when holding
Gone period 5.3 when, execute the first half of period 5.4 according to same rule, latter half is according to current voltage and default
Voltage (3/4~4/5 IGBT-Vc crest voltages) determines whether to change coefficient L, if current voltage is consistent with predeterminated voltage,
L mustn't be then changed, if less than normal, reduces L, if bigger than normal, increases L, to ensure 5.4 end IGBT-Vc peak values electricity of period
Pressure just touches copped wave point；Similarly within the period 5.5, PWM continues to be multiplied by L, and within the period 5.6,5.7,5.8, sequence is just
With the period 5.5,5.4,5.3 on the contrary, increasing L (1<L<1.5).
When having executed 1 envelope (period 5.3~5.8), if power is less than target power, the period 5.3 the is increased
One PWM duty cycle then reduces 5.3 first PWM duty cycles of period if it is greater than target power, up to target power and needs
Ask power consistent.
It is regular in the mode of adjustment of each period PWM heating when being divided into other a periods (such as larger than 6 periods)
, such as, the control PWM duty cycle of period 5.3 and period 5.8, cycle sequences are just opposite；The same period
5.4 with the period 5.7 defer to as rule；Period 5.5 is with the period 5.6 also in compliance with the same rule.
Fig. 7 shows the schematic diagram of voltage spectrum comparison according to the ... of the embodiment of the present invention.
As shown in fig. 7, in the corresponding frequency spectrum of voltage waveform (3) such as figure shown in frequency spectrum (6), the corresponding frequency of voltage waveform (5)
In spectrum such as figure shown in frequency spectrum (7), it can be seen that on 100,200,300,400 main frequency points, the frequency spectrum point of frequency spectrum (7) is than frequency
Spectrum (6) is low, and these frequency points are the droning most important frequency points of generation, although in 500,600 frequency points, the frequency spectrum of frequency spectrum (7)
Point is higher than the frequency spectrum point of frequency spectrum (6), but 500,600 frequency points are smaller relative to 100,200,300,400 to the contribution degree of noise.
Technical scheme of the present invention is described in detail above in association with attached drawing, technical solution through the invention can pass through
Modulation to voltage forces down the crest voltage shaken in waveform voltage under chopping voltage, due in the frequency spectrum of low-voltage,
The gain of low-frequency range is relatively low compared with the low-band gain of the voltage before modulation, and the gain of low-frequency range is electromagnetic noise
Main source, so electromagnetic noise can be reduced by forcing down the crest voltage of concussion waveform, so as to improve the usage experience of user.
The steps in the embodiment of the present invention can be sequentially adjusted, merged and deleted according to actual needs, this hair
Unit in bright embodiment system can be combined, divided and deleted according to actual needs.The foregoing is merely the present invention's
Preferred embodiment is not intended to restrict the invention, for those skilled in the art, the present invention can have it is various more
Change and changes.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in
Within protection scope of the present invention.
Claims (13)
1. a kind of method reducing electromagnetic noise, which is characterized in that including：
Voltage in each half-wave after full-wave rectification is detected at times；
If the voltage in any time period is more than default chopping voltage, the voltage is modulated so that modulated institute
The envelope size for stating half-wave is constant, and the voltage of each period in the half-wave is both less than equal to the default copped wave electricity
Pressure.
2. the method according to claim 1 for reducing electromagnetic noise, which is characterized in that described for every after full-wave rectification
Voltage in a half-wave carries out detection at times and specifically includes：
Using the maximum value of the half-wave as axis, each half-wave symmetry is divided into the even number period；
Check the voltage value in each period.
3. the method according to claim 2 for reducing electromagnetic noise, which is characterized in that described to be modulated to the voltage
It specifically includes：
The voltage of each period is modulated by the duty ratio of the pulsewidth modulation of change each period, wherein
In the voltage ascent stage of the half-wave, since the initial duty cycle of the first period, the duty ratio of each period
It is reduced with the rising of voltage, when modulated voltage is equal with default chopping voltage, the duty ratio is no longer reduced；
Increase with the decline of voltage in the duty ratio of the voltage decline stage of the half-wave, each period.
4. the method according to claim 3 for reducing electromagnetic noise, which is characterized in that further include：
Calculate the power of modulated each half-wave；
The power is compared with target power, and according to comparison result, determines the initial of the first period of next half-wave
Duty ratio.
5. the method according to claim 4 for reducing electromagnetic noise, which is characterized in that
When the power is more than the target power, the initial duty cycle is reduced；And
When the power is less than or equal to the target power, increase the initial duty cycle.
6. the method according to any one of claim 1 to 5 for reducing electromagnetic noise, which is characterized in that
The default chopping voltage is determined according to one or more of heating power, present operating voltage and cookware type.
7. a kind of device reducing electromagnetic noise, which is characterized in that including：
Segmenting unit detects the voltage in each half-wave after full-wave rectification at times；
Modulation unit is modulated the voltage if the voltage in any time period is more than default chopping voltage so that adjusts
The envelope size of the half-wave after system is constant, and the voltage of each period in the half-wave is both less than equal to described preset
Chopping voltage.
8. the device according to claim 7 for reducing electromagnetic noise, which is characterized in that the segmenting unit is specifically used for：
Using the maximum value of the half-wave as axis, each half-wave symmetry is divided into the even number period；
Check the voltage value in each period.
9. the device according to claim 8 for reducing electromagnetic noise, which is characterized in that the modulation unit is specifically used for：
The voltage of each period is modulated by the duty ratio of the pulsewidth modulation of change each period, wherein
In the voltage ascent stage of the half-wave, since the initial duty cycle of the first period, the duty ratio of each period
It is reduced with the rising of voltage, when modulated voltage is equal with default chopping voltage, the duty ratio is no longer reduced；
Increase with the decline of voltage in the duty ratio of the voltage decline stage of the half-wave, each period.
10. the device according to claim 9 for reducing electromagnetic noise, which is characterized in that further include：
Computing unit calculates the power of modulated each half-wave；
The power is compared by comparing unit with target power, and according to comparison result, when determining the first of next half-wave
The initial duty cycle of section.
11. the device according to claim 10 for reducing electromagnetic noise, which is characterized in that be specifically used for：
When the power is more than the target power, the initial duty cycle is reduced；And
When the power is less than or equal to the target power, increase the initial duty cycle.
12. the device of the reduction electromagnetic noise according to any one of claim 7 to 11, which is characterized in that
The default chopping voltage is determined according to one or more of heating power, present operating voltage and cookware type.
13. a kind of cooking apparatus, which is characterized in that including：
The device of reduction electromagnetic noise as described in any one of claim 7 to 12.
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| CN201710017789.5A CN108307552B (en) | 2017-01-11 | 2017-01-11 | Device and method for reducing electromagnetic noise and cooking utensil |
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| CN201710017789.5A CN108307552B (en) | 2017-01-11 | 2017-01-11 | Device and method for reducing electromagnetic noise and cooking utensil |
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| CN108307552B CN108307552B (en) | 2021-06-08 |
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Cited By (1)
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| CN110944420A (en) * | 2018-09-21 | 2020-03-31 | 深圳市鑫汇科股份有限公司 | Electromagnetic heating device and heating control method thereof |
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| CN108307552B (en) | 2021-06-08 |
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