CN107027202A - Electromagnetic Heating cooker and its heating control circuit and method for heating and controlling - Google Patents
Electromagnetic Heating cooker and its heating control circuit and method for heating and controlling Download PDFInfo
- Publication number
- CN107027202A CN107027202A CN201610074083.8A CN201610074083A CN107027202A CN 107027202 A CN107027202 A CN 107027202A CN 201610074083 A CN201610074083 A CN 201610074083A CN 107027202 A CN107027202 A CN 107027202A
- Authority
- CN
- China
- Prior art keywords
- heating
- power
- heating cooker
- electromagnetic
- electromagnetic heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/02—Induction heating
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Induction Heating Cooking Devices (AREA)
Abstract
The invention discloses a kind of Electromagnetic Heating cooker and its heating control circuit and method, methods described includes：Detect the voltage zero-crossing signal of AC power；When receiving low-power heating instructions, power gear is obtained according to low-power heating instructions, and the corresponding heat value of current desired heating power is obtained according to power gear；Heating interval is obtained according to heat value and stops heating interval；In heating interval, control discharge cell to stop electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker carries out heating work with predetermined power according to voltage zero-crossing signal；Stopping heating interval, discharge cell is controlled to carry out electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker stops heating work according to voltage zero-crossing signal, so as to be controlled according to the corresponding heat value of required heating power to Electromagnetic Heating cooker, reaching improves the purpose of power jitter when low-power is heated.
Description
Technical field
The present invention relates to electromagnetic heating technique field, more particularly to a kind of heating control circuit of Electromagnetic Heating cooker, a kind of method for heating and controlling of Electromagnetic Heating cooker and a kind of Electromagnetic Heating cooker.
Background technology
At present, Electromagnetic Heating cooker such as electromagnetic oven, electric cooker etc. is more realizes that low-power is heated using losing ripple mode.In low-power heating process, in view of IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) there is a situation where to turn in advance, therefore frequently with 1000W or so power, and heated within the cycle with certain dutycycle, so as to realize that low-power is heated.
In correlation technique, using the A cycle of laser heating within the fixed cycle, and stop heating B cycle realize low-power heat, i.e., heating power be A/ (A+B) * 1000W.Although this method is simple and is easily achieved, the phenomenon of easy emergent power shake.
The content of the invention
It is contemplated that at least solving one of technical problem in above-mentioned technology to a certain extent.For this, first purpose of the present invention is to propose a kind of method for heating and controlling of Electromagnetic Heating cooker, when low-power is heated, by obtaining the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker, and Electromagnetic Heating cooker is controlled according to heat value, the purpose of power jitter when improving low-power heating to reach.
Second object of the present invention is to propose a kind of heating control circuit of Electromagnetic Heating cooker.Third object of the present invention is to propose a kind of Electromagnetic Heating cooker.
To reach above-mentioned purpose, first aspect present invention embodiment proposes a kind of method for heating and controlling of Electromagnetic Heating cooker, the Electromagnetic Heating cooker includes resonance heating unit, for controlling the resonance heating unit to carry out the discharge cell that the power switch pipe of resonant operational, the driver element that the driving power switch pipe is switched on or off, the collector voltage to the power switch pipe carry out discharge process, the described method comprises the following steps：Detection is input to the voltage zero-crossing signal of the AC power of the Electromagnetic Heating cooker；When receiving low-power heating instructions, power gear is obtained according to the low-power heating instructions, and the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker is obtained according to the power gear；The heating interval of the Electromagnetic Heating cooker is obtained according to the heat value and stops heating interval；In the heating interval, control the discharge cell to stop electric discharge work according to the voltage zero-crossing signal, and the driver element is controlled so that the Electromagnetic Heating cooker carries out heating work with predetermined power according to the voltage zero-crossing signal；In the stopping heating interval, control the discharge cell to carry out electric discharge work according to the voltage zero-crossing signal, and the driver element is controlled so that the Electromagnetic Heating cooker stops heating work according to the voltage zero-crossing signal.
The method for heating and controlling of the Electromagnetic Heating cooker of the embodiment of the present invention, the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker is obtained according to power gear, and the heating interval of Electromagnetic Heating cooker is obtained according to heat value and stops heating interval, wherein, in heating interval, control discharge cell to stop electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker carries out heating work with predetermined power according to voltage zero-crossing signal；Stopping heating interval, electric discharge work is carried out according to voltage zero-crossing signal control discharge cell, and driver element is controlled so that Electromagnetic Heating cooker stops heating work, so that reaching improves the purpose of power jitter when low-power is heated according to voltage zero-crossing signal.
According to one embodiment of present invention, when receiving high power heating instructions, the driver element is controlled according to the voltage zero-crossing signal so that the Electromagnetic Heating cooker is run with the predetermined power laser heating, and controls the discharge cell to be in the state that is stopped.
According to one embodiment of present invention, the heat value is configured in binary form, wherein, it is described that the heating interval of the Electromagnetic Heating cooker is obtained according to the heat value and stops heating interval, including：Each position in the heat value is judged；When the present bit in the heat value is 1, the Electromagnetic Heating cooker is in the heating interval；When the present bit in the heat value is 0, the Electromagnetic Heating cooker is in the stopping heating interval.
According to one embodiment of present invention, the voltage over zero of the AC power is obtained according to the voltage zero-crossing signal, and controls the discharge cell to carry out electric discharge work in the voltage over zero or stops electric discharge work.
According to one embodiment of present invention, the power switch pipe is IGBT, and the driving control signal for controlling the driver element is PPG (Programmable Pulse Generator, programmable pulse generator) pulse.
To reach above-mentioned purpose, a kind of heating control circuit for Electromagnetic Heating cooker that the second aspect of the present invention embodiment is proposed, including：Voltage zero-cross detection unit, the voltage zero-cross detection unit is used for the voltage zero-crossing signal for detecting the AC power for being input to Electromagnetic Heating cooker；Resonance heating unit；Rectification filtering unit, the rectification filtering unit carries out resonance heating unit described in rectifying and wave-filtering treatment and supplied to the AC power；For controlling the resonance heating unit to carry out the power switch pipe of resonant operational；Driver element, the driver element is used to drive being switched on or off for the power switch pipe；The discharge cell of discharge process is carried out to the collector voltage of the power switch pipe；Main control unit, the main control unit respectively with the voltage zero-cross detection unit, the driver element is connected with the discharge cell, the main control unit is when receiving low-power heating instructions, power gear is obtained according to the low-power heating instructions, and the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker is obtained according to the power gear, and the heating interval of the Electromagnetic Heating cooker is obtained according to the heat value and stops heating interval, wherein, in the heating interval, the main control unit controls the discharge cell to stop electric discharge work according to the voltage zero-crossing signal, and the driver element is controlled so that the Electromagnetic Heating cooker carries out heating work with predetermined power according to the voltage zero-crossing signal；In the stopping heating interval, the main control unit controls the discharge cell to carry out electric discharge work according to the voltage zero-crossing signal, and controls the driver element so that the Electromagnetic Heating cooker stops heating work according to the voltage zero-crossing signal.
The heating control circuit of Electromagnetic Heating cooker according to embodiments of the present invention, main control unit obtains the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker according to power gear, and the heating interval of Electromagnetic Heating cooker is obtained according to heat value and stops heating interval, wherein, in heating interval, control discharge cell to stop electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker carries out heating work with predetermined power according to voltage zero-crossing signal；Stopping heating interval, electric discharge work is carried out according to voltage zero-crossing signal control discharge cell, and driver element is controlled so that Electromagnetic Heating cooker stops heating work, so that reaching improves the purpose of power jitter when low-power is heated according to voltage zero-crossing signal.
According to one embodiment of present invention, the main control unit is when receiving high power heating instructions, driver element is controlled always according to the voltage zero-crossing signal so that the Electromagnetic Heating cooker is run with the predetermined power laser heating, and controls the discharge cell to be in the state that is stopped.
According to one embodiment of present invention, the heat value is configured in binary form, the main control unit is by being judged each position in the heat value to obtain the heating interval and the stopping heating interval, wherein, when the present bit in the heat value is 1, the Electromagnetic Heating cooker is in the heating interval；When the present bit in the heat value is 0, the Electromagnetic Heating cooker is in the stopping heating interval.
According to one embodiment of present invention, the main control unit obtains the voltage over zero of the AC power according to the voltage zero-crossing signal, and controls the discharge cell to carry out electric discharge work in the voltage over zero or stop electric discharge work.
According to one embodiment of present invention, the power switch pipe is IGBT, and the main control unit controls the driving control signal of the driver element to be PPG pulses.
In addition, embodiments of the invention also proposed a kind of Electromagnetic Heating cooker, it includes the heating control circuit of above-mentioned Electromagnetic Heating cooker.
The Electromagnetic Heating cooker of the embodiment of the present invention, pass through above-mentioned heating control circuit, the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker can be obtained according to power gear, and the heating interval of Electromagnetic Heating cooker is obtained according to heat value and stops heating interval, wherein, in heating interval, control discharge cell to stop electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker carries out heating work with predetermined power according to voltage zero-crossing signal；Stopping heating interval, discharge cell is controlled to carry out electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker stops heating work according to voltage zero-crossing signal, the purpose of power jitter when improving low-power heating so as to reach, and the problem of efficiently solve the advanced conducting of power switch pipe and open firmly.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will be apparent and are readily appreciated that from the following description of the accompanying drawings of embodiments, wherein,
Fig. 1 is the structural representation of the heating control circuit of the Electromagnetic Heating cooker according to one embodiment of the invention；
Fig. 2 is oscillogram when being run according to the Electromagnetic Heating cooker high power laser heating of one embodiment of the invention；
Fig. 3 is the corresponding heating truth table of each power gear of the Electromagnetic Heating cooker according to one embodiment of the invention；
Fig. 4 is oscillogram when being interrupted heating operation according to the Electromagnetic Heating cooker low-power of one embodiment of the invention；
Fig. 5 is the computer heating control flow chart of the Electromagnetic Heating cooker according to one embodiment of the invention；And
Fig. 6 is the flow chart of the method for heating and controlling of the Electromagnetic Heating cooker according to the embodiment of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein same or similar label represents same or similar element or the element with same or like function from beginning to end.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Method for heating and controlling, the heating control circuit of Electromagnetic Heating cooker and the Electromagnetic Heating cooker of the Electromagnetic Heating cooker that propose according to embodiments of the present invention described with reference to the accompanying drawings.
Fig. 1 is the structural representation of the heating control circuit of the Electromagnetic Heating cooker according to one embodiment of the invention.As shown in figure 1, the heating control circuit of the Electromagnetic Heating cooker includes：Voltage zero-cross detection unit 10, resonance heating unit 20, rectification filtering unit, power switch pipe 40, driver element 50, discharge cell 60 and main control unit 70.
Wherein, voltage zero-cross detection unit 10 is used for the voltage zero-crossing signal for detecting the AC power (L, N) for being input to Electromagnetic Heating cooker, such as shown in Fig. 1, voltage zero-cross detection unit 10 is connected with AC power (L, N).Rectification filtering unit carries out output direct current supply resonance heating unit 20 after rectifying and wave-filtering processing to AC power, in embodiments of the present invention, rectification filtering unit includes rectifier bridge 301 and filter inductance L1 and filter capacitor C1, resonance heating unit 20 includes resonance coil L2 and resonant capacitance C2, and resonance coil L2 and resonant capacitance C2 are connected in parallel.Power switch pipe 40 is used to control resonance heating unit 20 to carry out resonant operational, wherein, power switch pipe 40 can be IGBT, and IGBT colelctor electrode is connected to the resonance coil L2 and resonant capacitance C2 of parallel connection.
The turning on and off with driving power switching tube 40 as shown in figure 1, driver element 50 is connected with the drive end such as IGBT of power switch pipe 40 gate pole, discharge cell 60 is used to carry out discharge process to the collector voltage of power switch pipe 40.Main control unit 70 respectively with voltage zero-cross detection unit 10, driver element 50 is connected with the control end of discharge cell 60, main control unit 70 is when receiving low-power heating instructions, power gear is obtained according to low-power heating instructions, and the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker is obtained according to power gear, and the heating interval of Electromagnetic Heating cooker is obtained according to heat value and stops heating interval, wherein, in heating interval, main control unit 70 controls discharge cell 60 to stop electric discharge work according to voltage zero-crossing signal, and driver element 50 is controlled so that Electromagnetic Heating cooker carries out heating work with predetermined power according to voltage zero-crossing signal；Stopping heating interval, main control unit 70 controls discharge cell 60 to carry out electric discharge work according to voltage zero-crossing signal, and driver element 50 is controlled so that Electromagnetic Heating cooker stops heating work according to voltage zero-crossing signal.
Further, according to one embodiment of present invention, as shown in figure 1, discharge cell 60 includes：Discharge resistance R1 and discharge control switch S1, discharge resistance R1 one end is connected to the resonance coil L2 and resonant capacitance C2 of parallel connection, discharge control switch S1 one end is connected with the discharge resistance R1 other end, discharge control switch S1 other end ground connection, discharge control switch S1 control end is connected with main control unit 70.Wherein, when discharge control switch S1 is closed under the control of main control unit 70, discharge cell 60 carries out electric discharge work；When discharge control switch S1 disconnects under the control of main control unit 70, discharge cell 60 stops electric discharge work.
That is, the heating control circuit of the Electromagnetic Heating cooker of the embodiment of the present invention, by setting discharge control switch S1, is controlled whether with discharge resistance R1 electric discharges.When S1 disconnects, resistance R1 electric discharges are not enabled, and Electromagnetic Heating cooker carries out heating work with predetermined power；When S1 is closed, R1 electric discharges are enabled, Electromagnetic Heating cooker stops heating work.
According to one embodiment of present invention, main control unit 70 is when receiving high power heating instructions, for example receive 1000W and the heating instructions of the above, driver element 40 is controlled according to voltage zero-crossing signal so that Electromagnetic Heating cooker is run with predetermined power laser heating, and control discharge cell 60 to be in the state that is stopped, that is, control discharge control switch S1 to be off.
Specifically, as shown in Figure 2, when Electromagnetic Heating cooker is run with high power laser heating, S1 is off, R1 electric discharges are not enabled, and Electromagnetic Heating cooker is run in laser heating mode, that is, sayed, Fig. 2 is oscillogram when Electromagnetic Heating cooker high power heats operation, and S1 drive waveforms are controlled when being followed successively by electric main waveform, Electromagnetic Heating cooker complete period heating waveform, the heating of Electromagnetic Heating cooker complete period from the top down.Figure it is seen that during whole heating, S1 is off.
In embodiments of the present invention, main control unit 70 is when receiving low-power heating instructions, for example when receiving below 1000W heating instructions, power gear is obtained according to low-power heating instructions, and the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker is obtained according to power gear, wherein, heat value can be configured in binary form, main control unit 70 by being judged each position in heat value with obtain heating interval and stop heating interval, wherein, when the present bit in heat value is 1, Electromagnetic Heating cooker is in heating interval；When the present bit in heat value is 0, Electromagnetic Heating cooker, which is in, stops heating interval.
Specifically, as shown in Figure 3, the heating interval of Electromagnetic Heating cooker can be obtained by the heat value A pre-set, heat value A can be the binary value (amounting to 10 heating cycles) of 10, and each binary digit may be considered single heating cycle.The power of heat value A and Electromagnetic Heating cooker is in corresponding relation, for example, when the heating power of Electromagnetic Heating cooker is 100W, corresponding heat value A=(0000000001)2, i.e., in first heating cycle, main control unit 70 controls Electromagnetic Heating cooker to carry out heating work with power 1000W, and in second to the tenth heating cycle, the control Electromagnetic Heating cooker of main control unit 70 stops heating work.And for example, when the heating power of Electromagnetic Heating cooker is 600W, corresponding heat value A=(1101010101)2I.e. in the first, the three, the five, the seven, the 9th and the tenth heating cycle, main control unit 70 controls Electromagnetic Heating cooker to carry out heating work with power 1000W, and in remaining heating cycle, the control Electromagnetic Heating cooker of main control unit 70 stops heating work.With using laser heating several cycles in correlation technique, then stop heating several cycle phase ratios, run due to Electromagnetic Heating cooker with being interrupted mode of heating, it is thus possible to which reaching improves the purpose of power jitter when low-power is heated.When the heating power of Electromagnetic Heating cooker is more than 1000W, corresponding heat value A=(1111111111)2, i.e. the control of main control unit 70 Electromagnetic Heating cooker complete period heating, when the heating power of Electromagnetic Heating cooker is 0W, corresponding heat value A=0.
Further, Fig. 4 is oscillogram when being interrupted heating operation according to the Electromagnetic Heating cooker low-power of one embodiment of the invention.As shown in figure 4, with 6/10 Duty ratio control S1 drive waveforms when being followed successively by electric main waveform, the heating waveform (6/10 dutycycle) of Electromagnetic Heating cooker, the interruption heating of Electromagnetic Heating cooker low-power from the top down.In Fig. 4, Electromagnetic Heating cooker is to be interrupted mode of heating operation, and heating power is 600W, and it is 6/10 that main control unit 70, which is exported to the dutycycle of the control signal of discharge cell 60,.That is, Electromagnetic Heating cooker is with low-power interruption heating operation, when heating power is 600W, main control unit controls S1 with certain break-make of duty ratio 6/10, and enabling resistance R1 during heating is stopped is discharged, and forbids S1 to close in heating interval.
As shown in Figure 4, low-power heating is realized with high power interruption mode of heating, problem is opened in advance so as to solve IGBT voltages well, S1 closures or disconnection are acted all near the voltage over zero of AC power simultaneously, due to R1 discharge process, IGBT is not present when voltage over zero starts to start and opens phenomenon firmly, it is to avoid IGBT is damaged.That is, stopping heating interval by controlling S1 closures so that IGBT collector voltage is discharged by discharge resistance R1, so that collector voltage reductions of the IGBT when starting next heating cycle, and then reducing IGBT pulse current, it is to avoid IGBT is firmly open-minded.
According to the specific example of the present invention, as shown in figure 5, the computer heating control process of Electromagnetic Heating cooker comprises the following steps：
S101, zero passage interrupt handling routine starts, i.e., when voltage zero-cross detection unit detects the voltage zero-crossing signal of AC power, and main control unit enters zero passage interrupt handling routine.
S102, heat value A is obtained according to power gear.
S103, judges whether heat value A is equal to 000H.If it is, performing step S104；If not, performing step S105.
S104, heats counter O reset, then performs step S115.That is, when heating power is 0W, main control unit control Electromagnetic Heating cooker stops heating.
S105, judges whether heat value A is equal to 3FFH.If it is, performing step S106；If not, performing step S107.
S106, heats counter O reset, then performs step S114.That is, when heating power is high power, otherwise main control unit control Electromagnetic Heating cooker complete period heating, in this embodiment, main control unit acquiescence being heated for low-power less than 1000W heat for high power.
S107, heating counter adds 1.
S108, judges whether heating counter is more than 10.If it is, performing step S109；If not, performing step S110.
S109, heating counter is equal to 1.
S110, judges whether heating counter is 1.If it is, performing step S111；If not, performing step S112.
S111, is assigned to binary number B by hexadecimal heat value A, i.e., is indicated hexadecimal number A with binary number B, each binary digit is judged with will pass through, to obtain heating interval and stop heating interval.
S112, binary number B is moved right one.
S113, whether the lowest order for judging binary number B is 1.If it is, performing step S114；If not, performing step S115.
S114, main control unit control Electromagnetic Heating cooker carries out heating work.
S115, main control unit control Electromagnetic Heating cooker stops carrying out heating work.
S116, zero passage interrupt handling routine terminates, and when voltage zero-cross detection unit detects the voltage zero-crossing signal of AC power again, main control unit is again introduced into zero passage interrupt handling routine, constantly circulation as procedure described above, to realize the computer heating control process of Electromagnetic Heating cooker.
According to one embodiment of present invention, the driving control signal that main control unit 70 is output to driver element 50 can be PPG pulses, and the control signal that main control unit 70 is output to discharge cell 60 can be low and high level signal.
In an embodiment of the present invention, Electromagnetic Heating cooker can be the electromagnetic products such as electromagnetic oven, prevention electromagnetic pressure cooker or electromagnetic rice cooker.
The heating control circuit of Electromagnetic Heating cooker according to embodiments of the present invention, main control unit obtains the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker according to power gear, and the heating interval of Electromagnetic Heating cooker is obtained according to heat value and stops heating interval, wherein, in heating interval, control discharge cell to stop electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker carries out heating work with predetermined power according to voltage zero-crossing signal；Stopping heating interval, discharge cell is controlled to carry out electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker stops heating work according to voltage zero-crossing signal, the purpose of power jitter when improving low-power heating so as to reach, and the problem of efficiently solve the advanced conducting of power switch pipe and open firmly.
Fig. 6 is the flow chart of the method for heating and controlling of the Electromagnetic Heating cooker according to the embodiment of the present invention.Wherein, the Electromagnetic Heating cooker includes resonance heating unit, for controlling resonance heating unit to carry out driver element that power switch pipe, the driving power switching tube of resonant operational are switched on or off, the discharge cell of discharge process being carried out to the collector voltage of power switch pipe.As shown in fig. 6, the method for heating and controlling of the Electromagnetic Heating cooker comprises the following steps：
S1, detection is input to the voltage zero-crossing signal of the AC power of Electromagnetic Heating cooker.For example, the voltage over zero signal of AC power can be detected by voltage zero-cross detection unit.
S2, when receiving low-power heating instructions, obtains power gear, and obtain the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker according to power gear according to low-power heating instructions.
S3, obtains the heating interval of Electromagnetic Heating cooker according to heat value and stops heating interval.
S4, in heating interval, controls discharge cell to stop electric discharge work according to voltage zero-crossing signal, and controls driver element so that Electromagnetic Heating cooker carries out heating work with predetermined power according to voltage zero-crossing signal.
S5, is stopping heating interval, controls discharge cell to carry out electric discharge work according to voltage zero-crossing signal, and controls driver element so that Electromagnetic Heating cooker stops heating work according to voltage zero-crossing signal.
According to one embodiment of present invention, when receiving high power heating instructions, such as power is 1000W and the heating instructions of the above, driver element is controlled according to voltage zero-crossing signal so that Electromagnetic Heating cooker is run with predetermined power laser heating, and controls discharge cell to be in the state that is stopped.
Specifically, as shown in figure 1, discharge cell includes discharge resistance R1 and discharge control switch S1.As shown in Fig. 2 when control Electromagnetic Heating cooker is run with high power laser heating, S1 is off, R1 electric discharges are not enabled, and Electromagnetic Heating cooker is run in laser heating mode.Figure it is seen that during whole heating, S1 is off.
According to one embodiment of present invention, when receiving low-power heating instructions, first power gear is obtained according to low-power heating instructions, and the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker is obtained according to power gear, heat value can be configured in binary form, wherein, the heating interval of Electromagnetic Heating cooker is obtained according to heat value and stops heating interval, including：Each position in heat value is judged；When the present bit in heat value is 1, Electromagnetic Heating cooker is in heating interval；When the present bit in heat value is 0, Electromagnetic Heating cooker, which is in, stops heating interval.
Specifically, as shown in Figure 3, the heating interval of Electromagnetic Heating cooker can be obtained by the heat value A pre-set, heat value A can be the binary value (amounting to 10 heating cycles) of 10, and each binary digit may be considered single heating cycle.The power of heat value A and Electromagnetic Heating cooker is in corresponding relation, for example, when the heating power of Electromagnetic Heating cooker is 100W, corresponding heat value A=(0000000001)2, i.e., in first heating cycle, control Electromagnetic Heating cooker carries out heating work with power 1000W, and in second to the tenth heating cycle, control Electromagnetic Heating cooker stops heating work.And for example, when the heating power of Electromagnetic Heating cooker is 600W, corresponding heat value A=(1101010101)2, i.e., in the first, the three, the five, the seven, the 9th and the tenth heating cycle, control Electromagnetic Heating cooker carries out heating work with power 1000W, and in remaining heating cycle, control Electromagnetic Heating cooker stops heating work.With using laser heating several cycles in correlation technique, then stop heating several cycle phase ratios, run due to Electromagnetic Heating cooker with being interrupted mode of heating, it is thus possible to which reaching improves the purpose of power jitter when low-power is heated.When the heating power of Electromagnetic Heating cooker is more than 1000W, corresponding heat value A=(1111111111)2, that is, the heating of Electromagnetic Heating cooker complete period is controlled, when the heating power of Electromagnetic Heating cooker is 0W, corresponding heat value A=0.
Further, as shown in figure 4, when Electromagnetic Heating cooker is run with being interrupted mode of heating, it is 6/10 to export to the dutycycle of the control signal of discharge cell.That is, when controlling Electromagnetic Heating cooker with low-power interruption heating operation, control S1 enables resistance R1 with certain duty such as 6/10 break-make, in stopping heating interval and discharged, and forbids S1 to close in heating interval.Wherein, low-power heating is realized with high power interruption mode of heating, problem is opened in advance so as to solve IGBT voltages well, S1 closures or disconnection are acted all near the voltage over zero of AC power simultaneously, due to R1 discharge process, IGBT is not present when voltage over zero starts to start and opens phenomenon firmly, IBGT is avoided to damage, say, in embodiments of the present invention, after detection is input to the voltage zero-crossing signal of the AC power of Electromagnetic Heating cooker, need the voltage over zero according to voltage zero-crossing signal acquisition AC power, and carry out electric discharge work in voltage over zero control discharge cell or stop electric discharge work.
Specifically, according to the example of the present invention, when heating power is less than 1000W, main control unit is defaulted as low power state, is otherwise high power state.When user's control Electromagnetic Heating cooker runs the heating of certain small-power (such as 600W), main control unit control S1 can be with the mode break-make of dutycycle 6/10, Electromagnetic Heating cooker is spaced with high-power (such as 1800W) and heated, as shown in Figure 4；When user's control Electromagnetic Heating cooker runs certain high-power (such as 1800W) heating, main control unit control S1 is off, as shown in Figure 2.
According to one embodiment of present invention, power switch pipe can be IGBT, and the driving control signal for controlling driver element can be PPG pulses, and the control signal for being output to discharge cell can be low and high level signal.
The method for heating and controlling of the Electromagnetic Heating cooker of the embodiment of the present invention, the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker is obtained according to power gear, and the heating interval of Electromagnetic Heating cooker is obtained according to heat value and stops heating interval, wherein, in heating interval, control discharge cell to stop electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker carries out heating work with predetermined power according to voltage zero-crossing signal；Stopping heating interval, discharge cell is controlled to carry out electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker stops heating work according to voltage zero-crossing signal, the purpose of power jitter when improving low-power heating so as to reach, and the problem of efficiently solve the advanced conducting of power switch pipe and open firmly.
In addition, embodiments of the invention also proposed a kind of Electromagnetic Heating cooker, it includes the heating control circuit of above-mentioned Electromagnetic Heating cooker.
The Electromagnetic Heating cooker of the embodiment of the present invention, pass through above-mentioned heating control circuit, the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker can be obtained according to power gear, and the heating interval of Electromagnetic Heating cooker is obtained according to heat value and stops heating interval, wherein, in heating interval, control discharge cell to stop electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker carries out heating work with predetermined power according to voltage zero-crossing signal；Stopping heating interval, discharge cell is controlled to carry out electric discharge work according to voltage zero-crossing signal, and driver element is controlled so that Electromagnetic Heating cooker stops heating work according to voltage zero-crossing signal, the purpose of power jitter when improving low-power heating so as to reach, and the problem of efficiently solve the advanced conducting of power switch pipe and open firmly.
In the description of the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", " under ", " preceding ", " rear ", " left side ", " right side ", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", the orientation or position relationship of instructions such as " circumferences " are based on orientation shown in the drawings or position relationship, it 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 have specific orientation, with specific azimuth configuration and operation, therefore it is 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, " first " is defined, at least one this feature can be expressed or be implicitly included to the feature of " second ".In the description of the invention, " multiple " are meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " connected ", " connection ", " fixation " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, can be connection or the interaction relationship of two elements of two element internals, unless otherwise clear and definite restriction.For the ordinary skill in the art, 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 that the first and second features are directly contacted "above" or "below" second feature, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature second feature " on ", " top " and " above " but fisrt feature or is merely representative of fisrt feature level height higher than second feature directly over second feature or oblique upper.Fisrt feature second feature " under ", " lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In the description of this specification, the description of reference term " one embodiment ", " some embodiments ", " example ", " specific example " or " some examples " etc. means to combine specific features, structure, material or the feature that the embodiment or example describe and is contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are necessarily directed to the schematic representation of above-mentioned term.Moreover, specific features, structure, material or the feature of description can in an appropriate manner be combined in any one or more embodiments or example.In addition, in the case of not conflicting, 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 can be combined and combined by those skilled in the art.
Although embodiments of the invention have been shown and described above, it is appreciated that, above-described embodiment is exemplary, it is impossible to be interpreted as limitation of the present invention, and one of ordinary skill in the art can be changed to above-described embodiment, change, replacing and modification within the scope of the invention.
Claims (11)
1. a kind of method for heating and controlling of Electromagnetic Heating cooker, it is characterised in that the Electromagnetic Heating cooker includes
Resonance heating unit, the power switch pipe for controlling the resonance heating unit progress resonant operational, the driving power are opened
Close driver element that pipe is switched on or off, the discharge cell of discharge process carried out to the collector voltage of the power switch pipe,
It the described method comprises the following steps：
Detection is input to the voltage zero-crossing signal of the AC power of the Electromagnetic Heating cooker；
When receiving low-power heating instructions, power gear is obtained according to the low-power heating instructions, and according to the work(
Rate gear obtains the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker；
The heating interval of the Electromagnetic Heating cooker is obtained according to the heat value and stops heating interval；
In the heating interval, the discharge cell is controlled to stop electric discharge work according to the voltage zero-crossing signal, and according to institute
State voltage zero-crossing signal and control the driver element so that the Electromagnetic Heating cooker carries out heating work with predetermined power；
In the stopping heating interval, the discharge cell is controlled to carry out electric discharge work, and root according to the voltage zero-crossing signal
The driver element is controlled according to the voltage zero-crossing signal so that the Electromagnetic Heating cooker stops heating work.
2. method for heating and controlling according to claim 1, it is characterised in that when receiving high power heating instructions,
The driver element is controlled so that the Electromagnetic Heating cooker is continuous with the predetermined power according to the voltage zero-crossing signal
Heating operation, and control the discharge cell to be in the state that is stopped.
3. method for heating and controlling according to claim 1 or 2, it is characterised in that the heat value is with binary shape
Formula is configured, wherein, it is described that the heating interval of the Electromagnetic Heating cooker is obtained according to the heat value and stops adding
Between hot-zone, including：
Each position in the heat value is judged；
When the present bit in the heat value is 1, the Electromagnetic Heating cooker is in the heating interval；
When the present bit in the heat value is 0, the Electromagnetic Heating cooker is in the stopping heating interval.
4. method for heating and controlling according to claim 1 or 2, it is characterised in that obtained according to the voltage zero-crossing signal
The voltage over zero of the AC power is taken, and controls the discharge cell to carry out electric discharge work or stop in the voltage over zero
Only discharge work.
5. method for heating and controlling according to claim 1, it is characterised in that the power switch pipe is IGBT, control
The driving control signal for making the driver element is PPG pulses.
6. a kind of heating control circuit of Electromagnetic Heating cooker, it is characterised in that including：
Voltage zero-cross detection unit, the voltage zero-cross detection unit is used to detect the exchange for being input to Electromagnetic Heating cooker
The voltage zero-crossing signal of power supply；
Resonance heating unit；
Rectification filtering unit, the rectification filtering unit carries out resonance described in rectifying and wave-filtering treatment and supplied to the AC power
Heating unit；
For controlling the resonance heating unit to carry out the power switch pipe of resonant operational；
Driver element, the driver element is used to drive being switched on or off for the power switch pipe；
The discharge cell of discharge process is carried out to the collector voltage of the power switch pipe；
Main control unit, the main control unit respectively with the voltage zero-cross detection unit, the driver element and the electric discharge list
Member is connected, and the main control unit obtains power shelves when receiving low-power heating instructions according to the low-power heating instructions
Position, and the corresponding heat value of the current desired heating power of Electromagnetic Heating cooker is obtained according to the power gear, with
And the heating interval of the Electromagnetic Heating cooker is obtained according to the heat value and stops heating interval, wherein,
In the heating interval, the main control unit controls the discharge cell to stop electric discharge work according to the voltage zero-crossing signal
Make, and the driver element is controlled so that the Electromagnetic Heating cooker is entered with predetermined power according to the voltage zero-crossing signal
Row heating work；
In the stopping heating interval, the main control unit controls the discharge cell to be put according to the voltage zero-crossing signal
Electricity work, and the driver element is controlled so that the Electromagnetic Heating cooker stops heating according to the voltage zero-crossing signal
Work.
7. the heating control circuit of Electromagnetic Heating cooker according to claim 6, it is characterised in that the master control
Unit controls driver element so that the electromagnetism adds when receiving high power heating instructions always according to the voltage zero-crossing signal
Heat cooking device is run with the predetermined power laser heating, and controls the discharge cell to be in the state that is stopped.
8. the heating control circuit of the Electromagnetic Heating cooker according to claim 6 or 7, it is characterised in that described
Heat value is configured in binary form, the main control unit by each position in the heat value is judged with
The heating interval and the stopping heating interval being obtained, wherein,
When the present bit in the heat value is 1, the Electromagnetic Heating cooker is in the heating interval；
When the present bit in the heat value is 0, the Electromagnetic Heating cooker is in the stopping heating interval.
9. the heating control circuit of the Electromagnetic Heating cooker according to claim 6 or 7, it is characterised in that described
Main control unit obtains the voltage over zero of the AC power according to the voltage zero-crossing signal, and in the voltage over zero control
The discharge cell is made to carry out electric discharge work or stop electric discharge work.
10. the heating control circuit of Electromagnetic Heating cooker according to claim 6, it is characterised in that the work(
Rate switching tube is IGBT, and the main control unit controls the driving control signal of the driver element to be PPG pulses.
11. a kind of Electromagnetic Heating cooker, it is characterised in that including the electricity according to any one of claim 6-10
The heating control circuit of magnetic heating cooking device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610074083.8A CN107027202B (en) | 2016-02-02 | 2016-02-02 | Electromagnetic heating cooking device and heating control circuit and heating control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610074083.8A CN107027202B (en) | 2016-02-02 | 2016-02-02 | Electromagnetic heating cooking device and heating control circuit and heating control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107027202A true CN107027202A (en) | 2017-08-08 |
| CN107027202B CN107027202B (en) | 2021-04-20 |
Family
ID=59525031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610074083.8A Active CN107027202B (en) | 2016-02-02 | 2016-02-02 | Electromagnetic heating cooking device and heating control circuit and heating control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107027202B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108903673A (en) * | 2018-08-15 | 2018-11-30 | 珠海格力电器股份有限公司 | Cooking appliance control method and cooking appliance |
| CN109838819A (en) * | 2017-11-24 | 2019-06-04 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic cooking appliance and its control method and control device |
| CN109936883A (en) * | 2017-12-15 | 2019-06-25 | 佛山市顺德区美的电热电器制造有限公司 | Method for heating and controlling, device, heating utensil and computer readable storage medium |
| CN110267381A (en) * | 2019-06-24 | 2019-09-20 | 深圳市驰创达科技有限公司 | Inexpensive continuous low power IH heater circuit and its control method |
| CN110618622A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device of cooking equipment, storage medium and cooking equipment |
| EP3890436A1 (en) * | 2020-04-02 | 2021-10-06 | LG Electronics, Inc. | Method for discharging capacitor of resonant power conversion apparatus at initiating operation and resonant power conversion apparatus thereof |
| CN113518479A (en) * | 2021-06-02 | 2021-10-19 | 孝感华工高理电子有限公司 | Multi-mode compatible control method and system based on electric automobile heater |
| CN113923810A (en) * | 2020-07-08 | 2022-01-11 | 台达电子工业股份有限公司 | Heating device and control method thereof |
| WO2022096122A1 (en) * | 2020-11-06 | 2022-05-12 | Intell Properties B.V. | Circuit arrangement for an induction cooker, induction cooker and method for operating an induction cooker |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201323669Y (en) * | 2008-11-28 | 2009-10-07 | 佛山市顺德区瑞德电子实业有限公司 | Control device of continuous heating during low power period of electromagnetic oven |
| CN201491306U (en) * | 2009-09-04 | 2010-05-26 | 东莞市前锋电子有限公司 | Low-power continuously heating circuit device of electromagnetic heating apparatus |
| WO2013064331A1 (en) * | 2011-11-03 | 2013-05-10 | Arcelik Anonim Sirketi | An induction heating cooker |
| CN103199831A (en) * | 2013-02-19 | 2013-07-10 | 刘德军 | Electric heating interval control device |
| JP5275783B2 (en) * | 2008-12-24 | 2013-08-28 | ホシザキ電機株式会社 | Control device for electromagnetic induction heating device |
| JP5506547B2 (en) * | 2010-06-01 | 2014-05-28 | 三菱電機株式会社 | Induction heating cooker |
| CN204538995U (en) * | 2015-04-07 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | The electromagnetic heater of cooking apparatus and cooking apparatus |
-
2016
- 2016-02-02 CN CN201610074083.8A patent/CN107027202B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201323669Y (en) * | 2008-11-28 | 2009-10-07 | 佛山市顺德区瑞德电子实业有限公司 | Control device of continuous heating during low power period of electromagnetic oven |
| JP5275783B2 (en) * | 2008-12-24 | 2013-08-28 | ホシザキ電機株式会社 | Control device for electromagnetic induction heating device |
| CN201491306U (en) * | 2009-09-04 | 2010-05-26 | 东莞市前锋电子有限公司 | Low-power continuously heating circuit device of electromagnetic heating apparatus |
| JP5506547B2 (en) * | 2010-06-01 | 2014-05-28 | 三菱電機株式会社 | Induction heating cooker |
| WO2013064331A1 (en) * | 2011-11-03 | 2013-05-10 | Arcelik Anonim Sirketi | An induction heating cooker |
| CN103199831A (en) * | 2013-02-19 | 2013-07-10 | 刘德军 | Electric heating interval control device |
| CN204538995U (en) * | 2015-04-07 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | The electromagnetic heater of cooking apparatus and cooking apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 《家电维修》工作室: "《新型电磁炉维修手册》", 30 November 2006, 哈尔滨工程大学出版社 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109838819A (en) * | 2017-11-24 | 2019-06-04 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic cooking appliance and its control method and control device |
| CN109936883A (en) * | 2017-12-15 | 2019-06-25 | 佛山市顺德区美的电热电器制造有限公司 | Method for heating and controlling, device, heating utensil and computer readable storage medium |
| CN109936883B (en) * | 2017-12-15 | 2021-10-26 | 佛山市顺德区美的电热电器制造有限公司 | Heating control method, heating control device, heating appliance and computer-readable storage medium |
| CN110618622A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device of cooking equipment, storage medium and cooking equipment |
| CN110618622B (en) * | 2018-06-20 | 2022-08-26 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device of cooking equipment, storage medium and cooking equipment |
| CN108903673A (en) * | 2018-08-15 | 2018-11-30 | 珠海格力电器股份有限公司 | Cooking appliance control method and cooking appliance |
| CN110267381A (en) * | 2019-06-24 | 2019-09-20 | 深圳市驰创达科技有限公司 | Inexpensive continuous low power IH heater circuit and its control method |
| EP3890436A1 (en) * | 2020-04-02 | 2021-10-06 | LG Electronics, Inc. | Method for discharging capacitor of resonant power conversion apparatus at initiating operation and resonant power conversion apparatus thereof |
| US11233446B2 (en) | 2020-04-02 | 2022-01-25 | Lg Electronics Inc. | Method for discharging capacitor of resonant power conversion apparatus at initiating operation and resonant power conversion apparatus thereof |
| EP3937593A1 (en) * | 2020-07-08 | 2022-01-12 | Delta Electronics, Inc. | Heating device and control method thereof |
| CN113923810A (en) * | 2020-07-08 | 2022-01-11 | 台达电子工业股份有限公司 | Heating device and control method thereof |
| CN113923810B (en) * | 2020-07-08 | 2024-09-06 | 台达电子工业股份有限公司 | Heating device and control method thereof |
| WO2022096122A1 (en) * | 2020-11-06 | 2022-05-12 | Intell Properties B.V. | Circuit arrangement for an induction cooker, induction cooker and method for operating an induction cooker |
| CN113518479A (en) * | 2021-06-02 | 2021-10-19 | 孝感华工高理电子有限公司 | Multi-mode compatible control method and system based on electric automobile heater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107027202B (en) | 2021-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107027202A (en) | Electromagnetic Heating cooker and its heating control circuit and method for heating and controlling | |
| CN205491254U (en) | Electromagnetic heating device and heating control circuit thereof | |
| CN107155230A (en) | Electromagnetic Heating cooker and its heating control circuit and low-power method for heating and controlling | |
| CN107027204A (en) | Electromagnetic heater and its heating control circuit and low-power method for heating and controlling | |
| CN106160534B (en) | The electromagnetic heater and its method for heating and controlling of cooking apparatus, cooking apparatus | |
| CN107561349A (en) | The zero passage detection and voltage sampling method and circuit of electromagnetic heater | |
| CN108024404B (en) | Electromagnetic heating system and its control method and device | |
| CN104279587A (en) | Control method of intelligent cloud convection heating and electromagnetic heating device | |
| CN106287863A (en) | Electromagnetic heater and control method thereof and control circuit | |
| CN106413160B (en) | The control method of relay, device in electromagnetic heating system and electromagnetic heating system | |
| EP3612004B1 (en) | Induction heating apparatus | |
| CN107087321B (en) | Method for adjusting hard turn-on voltage of IGBT and induction cooker | |
| CN205408198U (en) | Electromagnetic heating cooks device and heating control circuit thereof | |
| CN106211392B (en) | Electromagnetic heating system and its switching tube open control device and method | |
| CN105307293B (en) | The electric rice cooker heated circuit of 220V AC voltage power supply | |
| CN215345126U (en) | Heating detection circuit | |
| CN107027200A (en) | Electromagnetic heater and its heating control circuit and method for heating and controlling | |
| CN106714354A (en) | Electromagnetic heating device and control method thereof | |
| CN107155229A (en) | Electromagnetic Heating cooker and its heating control circuit and control method | |
| CN107070190A (en) | A kind of supply unit and its electric capacity method for heating and controlling | |
| CN205481176U (en) | Electromagnetic oven | |
| CN1135684C (en) | Electromagnetic cooker | |
| CN108419321A (en) | Electromagnetic heating apparatus, electromagnetic heating system and its method for heating and controlling and device | |
| CN204014133U (en) | A kind of electromagnetic heating circuit | |
| CN109699095A (en) | Electromagnetic heating apparatus and its method for heating and controlling and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |