CN107302809A - Electromagnetic Heating cooking system and its heating control apparatus and control method - Google Patents
Electromagnetic Heating cooking system and its heating control apparatus and control method Download PDFInfo
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- CN107302809A CN107302809A CN201610694080.4A CN201610694080A CN107302809A CN 107302809 A CN107302809 A CN 107302809A CN 201610694080 A CN201610694080 A CN 201610694080A CN 107302809 A CN107302809 A CN 107302809A
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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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Abstract
The invention discloses a kind of Electromagnetic Heating cooking system and its heating control apparatus and control method, method comprises the following steps：The target heating power of Electromagnetic Heating cooking system is obtained, wherein, target heating power is less than predetermined power threshold value；Heating duty is obtained according to target heating power and compares N/M, wherein, periodic quantity M of the heating duty than N/M is more than or equal to 4 alternation cycles, and heating duty heating frequency more corresponding than N/M is more than the first predeterminated frequency and less than or equal to the second predeterminated frequency, N, M are positive integer, and N is less than M；Electromagnetic Heating cooking system is controlled to carry out low-power heating than N/M according to heating duty, so that short flickering level value meets EMC testing standards in harmonic current and voltage flicker.It can be slowed by current waveform from there through increase periodic quantity, reduce harmonic current, meanwhile, by appropriate control heating duty than N/M, short flickering level value in voltage flicker can be improved, harmonic current and short flickering level value is met EMC testing standards.
Description
Technical field
The present invention relates to household electrical appliance technical field, more particularly to a kind of computer heating control side of Electromagnetic Heating cooking system
Method, a kind of control device of Electromagnetic Heating cooking system and a kind of Electromagnetic Heating cooking system with the device.
Background technology
Electromagnetic Heating cooking system in correlation technique generally adjusts heating duty ratio with half-wave counting mode, low to realize
Power is heated.But, the problem of correlation technique is present is, if the periodic quantity of dutycycle and dutycycle sets unreasonable, very
The harmonic current and the short flickering level value of voltage flicker being easily caused in EMC test items are exceeded.
Therefore, correlation technique needs to be improved.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose is to propose a kind of method for heating and controlling of Electromagnetic Heating cooking system, and this method can reduce harmonic current, change
The short flickering level value of kind voltage flicker.
It is another object of the present invention to propose a kind of heating control apparatus of Electromagnetic Heating cooking system.The present invention's
Another purpose is to propose a kind of Electromagnetic Heating cooking system.
To reach above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of computer heating control of Electromagnetic Heating cooking system
Method, comprises the following steps：The target heating power of the Electromagnetic Heating cooking system is obtained, wherein, the target heats work(
Rate is less than predetermined power threshold value；Heating duty is obtained than N/M according to the target heating power, wherein, the heating duty ratio
N/M periodic quantity M is more than or equal to 4 alternation cycles, and the heating duty is more than first than corresponding heating frequency
Predeterminated frequency and less than or equal to the second predeterminated frequency, wherein, N, M are positive integer, and N is less than M；The Electromagnetic Heating is controlled to cook
System carries out low-power heating according to the heating duty than N/M, so that short flickering level value in harmonic current and voltage flicker
Meet EMC testing standards.
The method for heating and controlling of the Electromagnetic Heating cooking system proposed according to embodiments of the present invention, control Electromagnetic Heating culinary art
System is heated according to heating duty than N/M, and sets periodic quantity M of the heating duty than N/M to be more than or equal to 4 exchanges half
Wave period, and set heating frequency to be more than the first predeterminated frequency and less than or equal to the second predeterminated frequency.Thus, the cycle of increasing is passed through
Value, can be slowed by current waveform, reach the purpose of reduction harmonic current, meanwhile, accounted for by appropriate control heating
Sky can improve short flickering level value in voltage flicker, meet short flickering level value in harmonic current and voltage flicker than N/M
EMC testing standards.
According to one embodiment of present invention, first predetermined power is 12Hz, and second predeterminated frequency can be
25Hz, periodic quantity M of the heating duty than N/M are less than or equal to 8 alternation cycles.
According to one embodiment of present invention, the heating duty than N/M can for 1/4,2/4,3/4,1/5,4/5,1/6,
5/6th, 1/7,6/7 or 7/8.
According to one embodiment of present invention, zero passage detection is carried out to obtain by the alternating current provided AC power
State the exchange half period.
To reach above-mentioned purpose, another aspect of the present invention embodiment also proposed a kind of heating of Electromagnetic Heating cooking system
Control device, including：First acquisition module, the target heating power for obtaining the Electromagnetic Heating cooking system, wherein, institute
Target heating power is stated less than predetermined power threshold value；Second acquisition module, is heated for being obtained according to the target heating power
Dutycycle N/M, wherein, periodic quantity M of the heating duty than N/M is more than or equal to 4 alternation cycles, and the heating
The corresponding heating frequencies of dutycycle N/M are more than the first predeterminated frequency and less than or equal to the second predeterminated frequency；Control module, for controlling
Make the Electromagnetic Heating cooking system and carry out low-power heating than N/M according to the heating duty, so that harmonic current and voltage
Short flickering level value meets EMC testing standards in flickering.
The heating control apparatus of the Electromagnetic Heating cooking system proposed according to embodiments of the present invention, control module control electromagnetism
Heating cooking system is heated according to heating duty than N/M, and sets periodic quantity M of the heating duty than N/M to be more than or equal to 4
The individual alternation cycle, and set heating frequency to be more than the first predeterminated frequency and less than or equal to the second predeterminated frequency.Thus, pass through
Increase periodic quantity, can be slowed by current waveform, reach the purpose of reduction harmonic current, meanwhile, pass through appropriate control
Heating duty processed can improve short flickering level value in voltage flicker than N/M, make short flickering level in harmonic current and voltage flicker
Value meets EMC testing standards.
According to one embodiment of present invention, first predetermined power is 12Hz, and second predeterminated frequency can be
25Hz, periodic quantity M of the heating duty than N/M are less than or equal to 8 alternation cycles.
According to one embodiment of present invention, the heating duty than N/M can for 1/4,2/4,3/4,1/5,4/5,1/6,
5/6th, 1/7,6/7 or 7/8.
According to one embodiment of present invention, the friendship that the control module is provided AC power by zero cross detection circuit
Stream electricity carries out zero passage detection, to determine the exchange half period.
To reach above-mentioned purpose, another aspect of the invention embodiment also proposed a kind of Electromagnetic Heating cooking system, including
The heating control apparatus of described Electromagnetic Heating cooking system.
The Electromagnetic Heating cooking system proposed according to embodiments of the present invention, passes through adding for the above-mentioned Electromagnetic Heating cooking system
Heat control device, can make short flickering level value in harmonic current and voltage flicker meet EMC testing standards.
According to one embodiment of present invention, the Electromagnetic Heating cooking system can be electromagnetic oven, electromagnetic rice cooker or electricity
Magnetic pressure pot.
Brief description of the drawings
Fig. 1 is the flow chart of the method for heating and controlling of Electromagnetic Heating cooking system according to embodiments of the present invention；
Fig. 2 is the control principle of the method for heating and controlling of Electromagnetic Heating cooking system according to an embodiment of the invention
Figure；
Fig. 3 is the block diagram of the heating control apparatus of Electromagnetic Heating cooking system according to embodiments of the present invention；
Fig. 4 is the square frame signal of the heating control apparatus of Electromagnetic Heating cooking system according to an embodiment of the invention
Figure；And
Fig. 5 is the circuit theory diagrams of the Electromagnetic Heating cooking system according to a specific embodiment of the invention.
Reference：
Heating control apparatus 100, the first acquisition module 101, the second acquisition module 102 and control module 103；
Zero cross detection circuit 104, the first diode D1, the second diode D2, first resistor R1, second resistance R2, first
Triode Q1 and 3rd resistor R3；
Discharge circuit 105；
Rectifier bridge 202, filtration module 203, resonant tank 201, IGBT pipes 204 and drive module 205；
Filter inductance L1 and filter capacitor C1, resonant capacitance C2 and resonant inductance L2,3rd resistor R3, the 4th resistance R4,
5th resistance R5 and the second triode Q2.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
Below with reference to the accompanying drawings come describe the embodiment of the present invention proposition Electromagnetic Heating cooking system and its heating control apparatus
And control method.
Fig. 1 is the flow chart of the method for heating and controlling of Electromagnetic Heating cooking system according to embodiments of the present invention.Such as Fig. 1 institutes
Show, the method for heating and controlling comprises the following steps：
S1：The target heating power of Electromagnetic Heating cooking system is obtained, wherein, target heating power is less than predetermined power threshold
Value.
Wherein, predetermined power can threshold value be 1300W.
Specifically, in low-power shelves, the instantaneous heating power of Electromagnetic Heating cooking system can be limited below 1300W.
Thus, the operating current of Electromagnetic Heating cooking system under low-power gear can be reduced, voltage pulsation amplitude is reduced, moreover, heating
When electric current it is smaller, can effectively reduce higher harmonic current value.
S2：Heating duty is obtained than N/M according to target heating power, wherein, periodic quantity M of the heating duty than N/M is more than
Or equal to 4 alternation cycles, and heating duty heating frequency more corresponding than N/M is more than the first predeterminated frequency and is less than or equal to
Second predeterminated frequency, wherein, N, M are positive integer, and N is less than M.
That is, will control heating cycle in 4 alternations more than the cycle, so as to by extending heating cycle, make
The change of current waveform becomes slow, and then can reduce higher harmonic current value.In other words, as M >=4, harmonic current is surveyed
Examination is qualified.
It should be noted that N can refer to alternation amount of cycles when Electromagnetic Heating cooking system is heated, M can refer to
Alternation amount of cycles when Electromagnetic Heating cooking system is heated is with stopping half period quantity sum when heating, example
Such as, Electromagnetic Heating cooking system is heated 3 alternation cycles, and stops 1 exchange half period of heating, then heating duty ratio
N/M is that 3/ (3+1) is 3/4.Heating duty is more corresponding than N/M to be heated to be alternation frequency and M ratio, such as heating duty
The periodic quantity M of ratio is 4, and alternation frequency is 100Hz, then heating duty heating frequency more corresponding than N/4 can be 100/4=
25Hz。
It should be noted that, Electromagnetic Heating cooking system can be powered by AC power, and the alternation cycle is alternating current
The exchange half period for the alternating current that source is provided, such as 50Hz mains electricity, the alternation cycle is 10ms.
According to one embodiment of present invention, the first predetermined power can be 12Hz, and the second predeterminated frequency can be 25Hz, heating
Dutycycle N/M periodic quantity M is less than or equal to 8 alternation cycles.
According to one embodiment of present invention, heating duty than N/M can for 1/4,2/4,3/4,1/5,4/5,1/6,5/6,
1/7th, 6/7 or 7/8.So that heating duty ratio is 1/4 as an example, the periodic quantity of heating cycle is 40ms for 4 exchange half periods, every
Individual heating cycle, can control 1 exchange half period of Electromagnetic Heating cooking system heating is 10ms, and controls Electromagnetic Heating culinary art system
System stopping 3 exchange half periods of heating are 30ms.
It should be noted that research shows, the vision reflection of people is relevant with the frequency that illumination is fluctuated：(1) flickering is perceived
Frequency range is 1 to 25Hz；(2) maximum of flickering perceives frequency range (its upper lower limit value is referred to as cutoff frequency for 0.05 to 35Hz
Rate, higher limit is also known as flicker-fusion frequency)；(3) flickering sensitive frequency scope is for 6 to 12Hz, and maximum sensitive frequency is 8.8Hz.
EMC test in would generally test voltage flickering (Voltage Flicker) short flickering level value Pst (Short
term Flicker Severity Value).Wherein, IEC (International Electrotechnical
Commission, International Electrotechnical Commission) to recommend to take Pst=1 as the short time flicker limit value of low-voltage power supply, referred to as unit is dodged
Become.Unit flickering is represented under standard laboratory conditions, and the 80% of experiment number has the flickering degree substantially felt.Work as Pst<When 0.7,
Typically it can not discover flickering；Work as Pst>When 1.3, flickering can make one not feeling well.
Thus, heating duty heating frequency more corresponding than N/M is ranged preferably from less than 25Hz, simultaneously, it is to avoid be in flickering
In sensitive frequency scope (i.e. 6 to 12Hz), and then it can show that maximum cycle value of the heating duty than N/M is 8, i.e. alternation
Cycle be 10ms when, the heating duty that periodic quantity is 8 than frequency be 1/8*100HZ=12.5Hz.
Tested according to laboratory, periodic quantity M for 5 to 8 heating duty ratio in, only 1/5,4/5,1/6,5/6,1/7,
6/7th, 7/8 PST values are less than 1, meet testing standard.And when with 1/4,2/4,3/4 heating duty than being heated PST values
Meet test request.
S3：Control Electromagnetic Heating cooking system according to heating duty than N/M carry out low-power heating so that harmonic current and
Short flickering level value meets EMC testing standards in voltage flicker.
That is, after suitable heating duty is selected than N/M, can control Electromagnetic Heating cooking system according to heating
Dutycycle N/M carries out low-power heating.Thus, it can control Electromagnetic Heating cooking system and carry out low-power heating, and by instantaneous work(
Rate is limited under 1300W, reduces operating current, and by rationally setting heating duty than N/M, may be such that EMC
Short flickering in harmonic current and voltage flicker in (Electro Magnetic Compatibility, Electro Magnetic Compatibility) test item
Level value meets EMC testing standards.
Further, according to one embodiment of present invention, zero passage inspection is carried out by the alternating current provided AC power
Survey to obtain the exchange half period.
Specifically, the zero crossing for the alternating current that can be provided AC power is detected to generate zero cross signal, arbitrarily
It it is an exchange half period between two adjacent zero cross signals, for example, as shown in Fig. 2 first zero cross signal A and the second mistake
It was the first exchange half period 1 between zero-signal B, is the second exchange half cycle between second zero crossing B and the 3rd zero cross signal C
It it is the 3rd exchange half period 3, the 4th zero cross signal D and the between phase 2, the 3rd zero cross signal C and the 4th zero cross signal D
It was the 4th exchange half period 4 between five zero cross signal E, is the 4th between the 5th zero cross signal E and the 6th zero cross signal F
Exchange the half period 5.
Wherein, can be as shown in Fig. 2 when controlling Electromagnetic Heating cooking system to be heated according to heating duty than 1/4
Control Electromagnetic Heating cooking system to be heated when detecting first zero cross signal A, and detect second zero cross signal B
When control Electromagnetic Heating cooking system stop heating.Stop 3 exchange half periods of heating, that is, detect the 5th zero passage letter
Control Electromagnetic Heating cooking system to be heated again during number E, so circulation, realize 1/4 heating duty than heating.
When controlling Electromagnetic Heating cooking system to be heated according to heating duty than 2/4, first mistake can detected
Control Electromagnetic Heating cooking system to be heated during zero-signal A, and Electromagnetic Heating is controlled when detecting the 3rd zero cross signal C
Cooking system stops heating.Stopping 2 exchange half periods of heating, i.e., the secondary control again when detecting the 5th zero cross signal E
Electromagnetic Heating cooking system is heated, so circulation, realizes 2/4 heating duty than heating.
When controlling Electromagnetic Heating cooking system to be heated according to heating duty than 3/4, first mistake can detected
Control Electromagnetic Heating cooking system to be heated during zero-signal A, and Electromagnetic Heating is controlled when detecting the 4th zero cross signal D
Cooking system stops heating.Stopping 1 exchange half period of heating, i.e., the secondary control again when detecting the 5th zero cross signal E
Electromagnetic Heating cooking system is heated, so circulation, realizes 3/4 heating duty than heating.
When controlling Electromagnetic Heating cooking system to be heated according to heating duty than 1/5, first mistake can detected
Control Electromagnetic Heating cooking system to be heated during zero-signal A, and Electromagnetic Heating is controlled when detecting second zero cross signal B
Cooking system stops heating.Stopping 4 exchange half periods of heating, i.e., the secondary control again when detecting the 6th zero cross signal F
Electromagnetic Heating cooking system is heated, so circulation, realizes 1/5 heating duty than heating.
When controlling Electromagnetic Heating cooking system to be heated according to heating duty than 4/5, first mistake can detected
Control Electromagnetic Heating cooking system to be heated during zero-signal A, and Electromagnetic Heating is controlled when detecting the 5th zero cross signal E
Cooking system stops heating.Stopping 1 exchange half period of heating, i.e., the secondary control again when detecting the 6th zero cross signal F
Electromagnetic Heating cooking system is heated, so circulation, realizes 4/5 heating duty than heating.
Further, according to one embodiment of present invention, heating is carried out in every secondary control Electromagnetic Heating cooking system
Before, first pass through discharge circuit and discharge the electric charge in Electromagnetic Heating cooking system on filter capacitor, its voltage is dropped to no-voltage
Near, then control Electromagnetic Heating cooking system to be heated again.Reason for this is that in order to reduce pan in each heating
The electromagnetic force size that cycle is subject to when starting, so that noise be preferably minimized.
Concretely comprise the following steps：As shown in Fig. 2 the control module of the rising edge triggering Electromagnetic Heating cooking system of zero cross signal
External interrupt, control module exports discharge signal to discharge circuit immediately, to control discharge circuit to start to carry out filter capacitor
Electric discharge, starts simultaneously at timing, upon discharging between when reaching preset time or when the trailing edge of zero cross signal is reached, control module
Revocation discharge signal is to control discharge circuit to turn off immediately, and then control module control resonant tank work is added with carrying out resonance
Heat.
, can be when receiving first zero cross signal A rising edge so that 1/4 heating duty is than heating as an example, control electric discharge
Circuit turn-on is to discharge filter capacitor, and when discharge time reaching preset time or first zero cross signal A
When trailing edge is reached, control discharge circuit shut-off controls Electromagnetic Heating cooking system to be heated to stop electric discharge.With it is foregoing
Control mode is similar, between control Electromagnetic Heating cooking system is heated again, that is, is receiving the 5th zero cross signal E
Rising edge when, again discharge circuit can be controlled to discharge filter capacitor, and when discharge time reaching preset time or
When the 5th zero cross signal E of person trailing edge is reached, control discharge circuit stops electric discharge, and controls Electromagnetic Heating cooking system again
It is secondary to be heated.
To sum up, the method for heating and controlling of the Electromagnetic Heating cooking system proposed according to embodiments of the present invention, control electromagnetism adds
Heat cooking system is heated according to heating duty than N/M, and sets periodic quantity M of the heating duty than N/M to be more than or equal to 4
The alternation cycle, and set heating duty heating frequency more corresponding than N/M to be more than the first predeterminated frequency and less than or equal to second
Predetermined power.Thus, it by increasing periodic quantity, can be slowed by current waveform, reach the purpose of reduction harmonic current,
Meanwhile, by appropriate control heating duty than N/M, short flickering level value in voltage flicker can be improved, make harmonic current and electricity
Short flickering level value meets EMC testing standards in pressure flickering.
The embodiment of the present invention also proposed a kind of heating control apparatus of Electromagnetic Heating cooking system.
Fig. 3 is the block diagram of the heating control apparatus of Electromagnetic Heating cooking system according to embodiments of the present invention.Such as
Shown in Fig. 3, the heating control apparatus 100 includes the first acquisition module 101, the second acquisition module 102 and control module 103.
Wherein, the first acquisition module 101 is used for the target heating power for obtaining Electromagnetic Heating cooking system, wherein, target
Heating power is less than predetermined power threshold value；Second acquisition module 102 is used to compare N/ according to target heating power acquisition heating duty
M, wherein, periodic quantity M of the heating duty than N/M is more than or equal to 4 alternation cycles, and heating duty is more corresponding than N/M
Heating frequency is more than the first predeterminated frequency and less than or equal to the second predeterminated frequency, wherein, N, M are positive integer, and N is less than M；Control
Module 103 be used for control Electromagnetic Heating cooking system according to heating duty than N/M carry out low-power heating so that harmonic current and
Short flickering level value meets EMC testing standards in voltage flicker.
That is, will can control heating cycle in 4 alternations more than the cycle, so that by extending heating cycle,
Making the change of current waveform becomes slow, and then can reduce higher harmonic current value.In other words, as M >=4, harmonic current
Test passes.
Also, predetermined power threshold value can be 1300W., can be by the instantaneous heating of Electromagnetic Heating cooking system in low-power shelves
Below power limit 1300W.Thus, the operating current of Electromagnetic Heating cooking system under low-power gear can be reduced, voltage is reduced
Fluctuation amplitude, moreover, electric current during heating is smaller, can effectively reduce higher harmonic current value.
Specifically, after suitable heating duty is selected than N/M, control module 103 can control Electromagnetic Heating culinary art
System carries out low-power heating according to heating duty than N/M.Thus, control module 103 can control Electromagnetic Heating cooking system and enter
Row low-power is heated, and instantaneous power is limited under 1300W, reduces operating current, and by rationally setting heating to account for
Sky may be such that harmonic current in EMC (Electro Magnetic Compatibility, Electro Magnetic Compatibility) test item than N/M
Meet EMC testing standards with short flickering level value in voltage flicker.
It should be noted that N can refer to alternation amount of cycles when Electromagnetic Heating cooking system is heated, M can refer to
Alternation amount of cycles when Electromagnetic Heating cooking system is heated is with stopping half period quantity sum when heating, example
Such as, Electromagnetic Heating cooking system is heated 3 alternation cycles, and stops 1 exchange half period of heating, then heating duty ratio
N/M is that 3/ (3+1) is 3/4.Heating duty heating frequency more corresponding than N/M is alternation frequency and M ratio, for example, heat
The periodic quantity M of dutycycle is 4, and alternation frequency is 100Hz, then heating duty heating frequency more corresponding than N/4 can be
100/4=25Hz.
It should be noted that, Electromagnetic Heating cooking system can be powered by AC power, and the alternation cycle is alternating current
The exchange half period for the alternating current that source is provided, such as 50Hz mains electricity, the alternation cycle is 10ms.
According to one embodiment of present invention, the first predetermined power can be 12Hz, and the second predeterminated frequency can be 25Hz, plus
Hot dutycycle N/M periodic quantity M is less than or equal to 8 alternation cycles.
According to one embodiment of present invention, heating duty than N/M can for 1/4,2/4,3/4,1/5,4/5,1/6,5/6,
1/7th, 6/7 or 7/8.So that heating duty ratio is 1/4 as an example, the periodic quantity of heating cycle is 40ms for 4 exchange half periods, every
Individual heating cycle, control module 103 can control Electromagnetic Heating cooking system and heat 1 exchange half period i.e. 10ms, and control electricity
Magnetic heating cooking system stopping 3 exchange half periods of heating are 30ms.
It should be noted that research shows, the vision reflection of people is relevant with the frequency that illumination is fluctuated：(1) flickering is perceived
Frequency range is 1 to 25Hz；(2) maximum of flickering perceives frequency range (its upper lower limit value is referred to as cutoff frequency for 0.05 to 35Hz
Rate, higher limit is also known as flicker-fusion frequency)；(3) flickering sensitive frequency scope is for 6 to 12Hz, and maximum sensitive frequency is 8.8Hz.
EMC test in would generally test voltage flickering (Voltage Flicker) short flickering level value Pst (Short
term Flicker Severity Value).Wherein, IEC (International Electrotechnical
Commission, International Electrotechnical Commission) to recommend to take Pst=1 as the short time flicker limit value of low-voltage power supply, referred to as unit is dodged
Become.Unit flickering is represented under standard laboratory conditions, and the 80% of experiment number has the flickering degree substantially felt.Work as Pst<When 0.7,
Typically it can not discover flickering；Work as Pst>When 1.3, flickering can make one not feeling well.
Thus, heating duty heating frequency more corresponding than N/M is ranged preferably from less than 25Hz, simultaneously, it is to avoid be in flickering
In sensitive frequency scope (i.e. 6 to 12Hz), and then it can show that maximum cycle value of the heating duty than N/M is 8, i.e. alternation
Cycle be 10ms when, the heating duty that periodic quantity is 8 than frequency be 1/8*100HZ=12.5Hz.
Tested according to laboratory, periodic quantity M for 5 to 8 heating duty ratio in, only 1/5,4/5,1/6,5/6,1/7,
6/7th, 7/8 PST values are less than 1, meet testing standard.And when with 1/4,2/4,3/4 heating duty than being heated PST values
Meet test request.
According to one embodiment of present invention, as shown in figure 4, control module 103 passes through 104 pairs of exchanges of zero cross detection circuit
The alternating current that power supply is provided carries out zero passage detection, to determine to exchange the half period.
Specifically, the zero crossing for the alternating current that zero cross detection circuit 104 can be provided AC power is detected with life
It it is an exchange half period between the adjacent zero cross signal of any two, for example, as shown in Fig. 2 first mistake into zero cross signal
Exchange the half period 1 between zero-signal A and the second zero cross signal B for first, second zero crossing B and the 3rd zero cross signal C it
Between for the second exchange half period 2, be the 3rd exchange half period 3 between the 3rd zero cross signal C and the 4th zero cross signal D, the
It it is the 4th exchange half period 4, the 5th zero cross signal E and the 6th mistake between four zero cross signal D and the 5th zero cross signal E
It it was the 4th exchange half period 5 between zero-signal F.
Wherein, as shown in Fig. 2 when the control Electromagnetic Heating cooking system of control module 103 is carried out according to heating duty than 1/4
During heating, when zero cross detection circuit 104 detects first zero cross signal A Electromagnetic Heating cooking system can be controlled to be added
Heat, and control Electromagnetic Heating cooking system to stop heating when zero cross detection circuit 104 detects second zero cross signal B.
Stop 3 exchange half periods of heating, i.e., control module 103 is again when zero cross detection circuit 104 detects the 5th zero cross signal E
Secondary control Electromagnetic Heating cooking system is heated, so circulation, realizes 1/4 heating duty than heating.
, can be in zero passage when the control Electromagnetic Heating cooking system of control module 103 is heated according to heating duty than 2/4
Control Electromagnetic Heating cooking system is heated when detection circuit 104 detects first zero cross signal A, and in zero passage detection electricity
Control Electromagnetic Heating cooking system stops heating when road 104 detects the 3rd zero cross signal C.Stopping 2 exchanges of heating half
Cycle, i.e., when zero cross detection circuit 104 detects the 5th zero cross signal E, control module 103 controls Electromagnetic Heating to cook again
The system of preparing food is heated, so circulation, realizes 2/4 heating duty than heating.
, can be in zero passage when the control Electromagnetic Heating cooking system of control module 103 is heated according to heating duty than 3/4
Control Electromagnetic Heating cooking system is heated when detection circuit 104 detects first zero cross signal A, and in zero passage detection electricity
Control Electromagnetic Heating cooking system stops heating when road 104 detects the 4th zero cross signal D.Stopping 1 exchange of heating half
Cycle, i.e., when zero cross detection circuit 104 detects the 5th zero cross signal E, control module 103 controls Electromagnetic Heating to cook again
The system of preparing food is heated, so circulation, realizes 3/4 heating duty than heating.
, can be in zero passage when the control Electromagnetic Heating cooking system of control module 103 is heated according to heating duty than 1/5
Control Electromagnetic Heating cooking system is heated when detection circuit 104 detects first zero cross signal A, and in zero passage detection electricity
Control Electromagnetic Heating cooking system stops heating when road 104 detects second zero cross signal B.Stopping 4 exchanges of heating half
Cycle, i.e., when zero cross detection circuit 104 detects the 6th zero cross signal F, control module 103 controls Electromagnetic Heating to cook again
The system of preparing food is heated, so circulation, realizes 1/5 heating duty than heating.
, can be in zero passage when the control Electromagnetic Heating cooking system of control module 103 is heated according to heating duty than 4/5
Control Electromagnetic Heating cooking system is heated when detection circuit 104 detects first zero cross signal A, and in zero passage detection electricity
Control Electromagnetic Heating cooking system stops heating when road 104 detects the 5th zero cross signal E.Stopping 1 exchange of heating half
Cycle, i.e., Electromagnetic Heating cooking system is controlled to be added again when zero cross detection circuit 104 detects the 6th zero cross signal F
Heat, so circulation, realize 4/5 heating duty than heating.
Specifically, according to one embodiment of present invention, as shown in figure 5, zero cross detection circuit 104 may include the one or two pole
Pipe D1, the second diode D2, first resistor R1, second resistance R2, the first triode Q1 and 3rd resistor R3.
Wherein, the first diode D1 anode is connected with the live wire L of AC power；Second diode D2 anode is with exchanging
The zero line N of power supply is connected, and the second diode D2 negative electrode is connected with the first diode D1 negative electrode and has a first node；First
Resistance R1 one end is connected with first node；Second resistance R2 one end is connected with the first resistor R1 other end and has second
Node, second resistance R2 other end ground connection；First triode Q1 base stage is connected with Section Point, the first triode Q1 hair
Emitter grounding, the first triode Q1 colelctor electrode is connected with 3rd resistor R3 one end, the first triode Q1 colelctor electrode and control
Molding block 103 is connected to export zero cross signal；The 3rd resistor R3 other end is connected with default power vd D.
First diode D1 and the second diode D2 is used to carry out rectification to the alternating current of AC power, as shown in Fig. 2 working as
When alternating current is not near zero-crossing point, the partial pressure on second resistance R2 can turn on the first triode Q1, the first triode Q1
The voltage of colelctor electrode be pulled down to 0V；When alternating current is near zero-crossing point, the partial pressure on second resistance R2 can not make the
One triode Q1 is turned on, the first triode Q1 shut-offs, and the voltage of the first triode Q1 colelctor electrode is pulled up to preset power vd D
Voltage, zero cross detection circuit 104 output zero cross signal.
Further, according to one embodiment of present invention, as shown in Figures 4 and 5, control module 103 is in every secondary control electricity
Before magnetic heating cooking system is heated, discharge circuit 105 is first passed through by Electromagnetic Heating cooking system on filter capacitor C1
Electric charge release, its voltage is dropped near no-voltage, then control module 103 controls Electromagnetic Heating cooking system to be added again
Heat.Reason for this is that in order to reduce the electromagnetic force size that pan is subject to when starting each heating cycle, so that by noise
It is preferably minimized.
Concretely comprise the following steps：As shown in Fig. 2 the external interrupt of the rising edge trigger control module 103 of zero cross signal, controls mould
Block 103 exports discharge signal to discharge circuit 105 immediately, to control discharge circuit 105 to start to discharge to filter capacitor C1,
Start simultaneously at timing, upon discharging between when reaching preset time or when the trailing edge of zero cross signal is reached, control module 103 is stood
That is revocation discharge signal is to control discharge circuit 105 to turn off, and then the control of control module 103 resonant tank 201 works to carry out
Resonance is heated.
So that 1/4 heating duty is than heating as an example, control module 103 can receive first zero cross signal A rising edge
When, control discharge circuit 105 is turned on to discharge filter capacitor C1, and when discharge time reaching preset time or the
When one zero cross signal A trailing edge is reached, control discharge circuit 105 is turned off to stop electric discharge, and controls resonant tank 201 to enter
Row resonance is heated.It is similar with foregoing control mode, control Electromagnetic Heating cooking system to carry out heating again in control module 103
Between, i.e., when receiving the 5th zero cross signal E rising edge, discharge circuit 105 can be controlled to carry out filter capacitor C1 again
Electric discharge, and when discharge time reaching preset time or when the 5th zero cross signal E trailing edge is reached, control discharge circuit
105 stop electric discharge, and control resonant tank 201 to be heated again.
Specifically, as shown in figure 5, Electromagnetic Heating cooking system also includes rectifier bridge 202, filtration module 203, resonant tank
201st, IGBT pipes 204 and drive module 205.
Wherein, the first input end of rectifier bridge 202 is connected with the live wire L of AC power, the second input of rectifier bridge 202
It is connected with the zero line N of AC power, the alternating current that rectifier bridge 202 is used to provide AC power is converted to direct current；Filter mould
Block 203 includes filter inductance L1 and filter capacitor C1, and filter inductance L1 one end is connected with the second output end of rectifier bridge 202,
First output head grounding of rectifier bridge 202, filter capacitor C1 one end is connected with the filter inductance L1 other end, filter capacitor C1
The other end ground connection；Resonant tank 201 is used to carry out pan resonance heating, and resonant tank 201 includes resonant capacitance in parallel
C2 and resonant inductance L2, resonant capacitance C2 in parallel and resonant inductance L2 one end are connected with the filter inductance L1 other end, and
The resonant capacitance C2 and resonant inductance L2 of the connection other end are connected with the colelctor electrode of IGBT pipes 204, and the emitter stage of IGBT pipes 204 connects
Ground, the grid of IGBT pipes 204 is connected with drive module 205.The computer heating control of the Electromagnetic Heating cooking system of the embodiment of the present invention
Device 100 be used for by drive module 205 to IGBT pipes 204 be switched on or off be controlled, with the resonance to resonant tank
Heating is controlled.
Specifically, as shown in figure 5, discharge circuit 105 includes 3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and the
Two triode Q2.
Wherein, the second triode Q2 grounded emitter, the second triode Q2 colelctor electrode passes through 3rd resistor R3 and filter
The ripple inductance L1 other end and filter capacitor C1 one end are connected, the second triode Q2 base stage respectively with the 4th resistance R4 one
End is connected with the 5th resistance R5 one end；4th resistance R4 other end ground connection, the 5th resistance the R5 other end and computer heating control
Control module 103 in device 100 is connected.
Specifically, control module 103 can control the second triode Q2 conductings by exporting high level, to control electric discharge electricity
Filter capacitor C1 is discharged on road 105；And can be by exporting the second triode of low level control Q2 shut-offs, to control electric discharge electricity
Road 105 stops electric discharge.
To sum up, the heating control apparatus of the Electromagnetic Heating cooking system proposed according to embodiments of the present invention, control module control
Electromagnetic Heating cooking system processed is heated according to heating duty than N/M, and sets periodic quantity M of the heating duty than N/M to be more than
Or equal to 4 alternation cycles, and set heating duty to be more than the first predeterminated frequency than N/M correspondence heating frequencies and be less than etc.
In the second predetermined power.Thus, it by increasing periodic quantity, can be slowed by current waveform, reach reduction harmonic current
Purpose, meanwhile, by appropriate control heating duty than N/M, short flickering level value in voltage flicker can be improved, make harmonic wave electricity
Short flickering level value meets EMC testing standards in stream and voltage flicker.
The present invention has also been proposed a kind of Electromagnetic Heating cooking system, and the Electromagnetic Heating cooking system includes above-described embodiment
Electromagnetic Heating cooking system includes heating control apparatus.
According to the specific embodiment of the present invention, Electromagnetic Heating cooking system can be electromagnetic oven, electromagnetic rice cooker or electricity
Magnetic pressure pot.
The Electromagnetic Heating cooking system proposed according to embodiments of the present invention, passes through adding for the above-mentioned Electromagnetic Heating cooking system
Heat control device, can make short flickering level value in harmonic current and voltage flicker meet EMC testing standards.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than indicate or imply that the device or element of meaning must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (10)
1. a kind of method for heating and controlling of Electromagnetic Heating cooking system, it is characterised in that comprise the following steps：
The target heating power of the Electromagnetic Heating cooking system is obtained, wherein, the target heating power is less than predetermined power
Threshold value；
Heating duty is obtained than N/M according to the target heating power, wherein, periodic quantity M of the heating duty than N/M is more than
Or equal to 4 alternation cycles, and the heating duty than corresponding heating frequency be more than the first predeterminated frequency and less than etc.
In the second predeterminated frequency, wherein, N, M are positive integer, and N is less than M；
The Electromagnetic Heating cooking system is controlled to carry out low-power heating than N/M according to the heating duty, so that harmonic current
Meet EMC testing standards with short flickering level value in voltage flicker.
2. the method for heating and controlling of Electromagnetic Heating cooking system according to claim 1, it is characterised in that described first is pre-
If power is 12Hz, second predeterminated frequency is 25Hz, and periodic quantity M of the heating duty than N/M is less than or equal to 8 friendships
Flow half wave cycles.
3. the method for heating and controlling of Electromagnetic Heating cooking system according to claim 2, it is characterised in that the heating is accounted for
Empty is 1/4,2/4,3/4,1/5,4/5,1/6,5/6,1/7,6/7 or 7/8 than N/M.
4. the method for heating and controlling of Electromagnetic Heating cooking system according to claim 1, it is characterised in that by exchange
The alternating current that power supply is provided carries out zero passage detection to obtain the exchange half period.
5. a kind of heating control apparatus of Electromagnetic Heating cooking system, it is characterised in that including：
First acquisition module, the target heating power for obtaining the Electromagnetic Heating cooking system, wherein, the target heating
Power is less than predetermined power threshold value；
Second acquisition module, for obtaining heating duty than N/M according to the target heating power, wherein, the heating duty
Periodic quantity M than N/M is more than or equal to 4 alternation cycles, and the heating duty is more than the than corresponding heating frequency
One predeterminated frequency and less than or equal to the second predeterminated frequency, wherein, N, M are positive integer, and N is less than M；
Control module, for controlling the Electromagnetic Heating cooking system according to the heating duty than N/M progress low-power heating,
So that short flickering level value meets EMC testing standards in harmonic current and voltage flicker.
6. the heating control apparatus of Electromagnetic Heating cooking system according to claim 5, it is characterised in that described first is pre-
If power is 12Hz, second predeterminated frequency is 25Hz, and periodic quantity M of the heating duty than N/M is less than or equal to 8 friendships
Flow half wave cycles.
7. the heating control apparatus of Electromagnetic Heating cooking system according to claim 6, it is characterised in that the heating is accounted for
Empty is 1/4,2/4,3/4,1/5,4/5,1/6,5/6,1/7,6/7 or 7/8 than N/M.
8. the heating control apparatus of Electromagnetic Heating cooking system according to claim 5, it is characterised in that the control mould
The alternating current that block is provided AC power by zero cross detection circuit carries out zero passage detection, to determine the exchange half period.
9. a kind of Electromagnetic Heating cooking system, it is characterised in that add including the electromagnetism according to any one of claim 5-8
The heating control apparatus of heat cooking system.
10. Electromagnetic Heating cooking system according to claim 9, it is characterised in that the Electromagnetic Heating cooking system is
Electromagnetic oven, electromagnetic rice cooker or prevention electromagnetic pressure cooker.
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| CN201610694080.4A CN107302809B (en) | 2016-08-18 | 2016-08-18 | Electromagnetic heating cooking system and heating control device and control method thereof |
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| CN201610694080.4A CN107302809B (en) | 2016-08-18 | 2016-08-18 | Electromagnetic heating cooking system and heating control device and control method thereof |
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| WO2019119641A1 (en) * | 2017-12-21 | 2019-06-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic cookware and power control method therefor |
| CN109951909A (en) * | 2017-12-21 | 2019-06-28 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic cooking appliance and its intermittent-heating control method |
| CN112083747A (en) * | 2020-06-30 | 2020-12-15 | 海益（厦门）建材工业有限公司 | Heating control method and device for inhibiting flicker interference |
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| WO2022229695A1 (en) * | 2021-04-30 | 2022-11-03 | Zhejiang Supor Electrical Appliances Manufacturing Co., Ltd. | A heating control method and device and an electromagnetic heating cooking utensil |
| CN113382492A (en) * | 2021-06-21 | 2021-09-10 | 广东美的厨房电器制造有限公司 | Control method of microwave generating device, cooking device and readable storage medium |
| CN113382492B (en) * | 2021-06-21 | 2024-01-23 | 广东美的厨房电器制造有限公司 | Control method of microwave generating device, cooking device and readable storage medium |
| CN114183769A (en) * | 2021-12-16 | 2022-03-15 | 珠海格力电器股份有限公司 | Control method and control device for gas proportional valve |
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