CN111432512B - Electromagnetic heating equipment and heating control device and method thereof - Google Patents
Electromagnetic heating equipment and heating control device and method thereof Download PDFInfo
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Abstract
The invention relates to an electromagnetic heating device and a heating control device and method thereof, wherein the electromagnetic heating device comprises a plurality of furnace ends, the heating control device comprises a plurality of resonant circuits which are in one-to-one correspondence with the plurality of furnace ends, and the heating control device also comprises: the power acquisition module is used for acquiring the target output power of each burner to obtain a plurality of target output powers and acquiring the maximum value of the plurality of target output powers to obtain the maximum target output power; and the control module is connected with the power acquisition module and the plurality of resonant circuits respectively and is used for controlling the resonant circuit of the furnace end corresponding to the maximum target output power in a non-wave-loss mode according to the maximum target output power and controlling the resonant circuits of the rest furnace ends in a same-frequency wave-loss mode according to the maximum target output power and the rest target output power. Thereby not only can satisfy the power demand of all furnace ends, can effectively solve the problem that produces the noise because of the pan interval is too little when many furnace ends heat simultaneously moreover.
Description
Technical Field
The invention relates to the technical field of electromagnetic heating, in particular to electromagnetic heating equipment and a heating control device and method thereof.
Background
Electromagnetic induction heating, referred to as induction heating for short, is to generate eddy currents in the heated material by an electromagnetic induction method, and achieve the purpose of heating by means of the energy of the eddy currents.
Because the electromagnetic induction heating has the advantages of no open fire, environmental protection, safety, energy conservation and the like, the induction heating is more and more favored by consumers, and meanwhile, along with the development of social economy in all aspects, the living standard of people is improved, and the induction heating of the multiple furnace ends is more and more brought into the lives of people. However, when a plurality of burners heated simultaneously, because the operating frequency of each burner is different (but all in the super audio frequency district), when two pans were close to, the noise that can beat and fall into the people's ear audio frequency within range seriously influences user experience.
Disclosure of Invention
Accordingly, it is necessary to provide an electromagnetic heating apparatus, a heating control device and a method thereof, which are directed to the problem of noise generated due to too small space between cookers when a plurality of burners are heated simultaneously.
The utility model provides an electromagnetic heating equipment's heating control device, electromagnetic heating equipment includes a plurality of furnace ends, heating control device include with a plurality of furnace end one-to-one a plurality of resonant circuit, heating control device still includes:
the power acquisition module is used for acquiring the target output power of each burner to obtain a plurality of target output powers and acquiring the maximum value of the plurality of target output powers to obtain the maximum target output power;
and the control module is connected with the power acquisition module and the plurality of resonant circuits respectively and is used for controlling the resonant circuit of the furnace end corresponding to the maximum target output power in a non-wave-loss mode according to the maximum target output power and controlling the resonant circuits of the rest furnace ends in a same-frequency wave-loss mode according to the maximum target output power and the rest target output power.
In one embodiment, the controlling module controls the resonant circuit of the furnace end corresponding to the maximum target output power in a non-wave-loss manner according to the maximum target output power, and includes:
generating a first control signal according to the maximum target output power, and controlling a resonant circuit of the furnace end corresponding to the maximum target output power according to the first control signal;
the control module controls the resonant circuit of the rest furnace end in a same-frequency wave-dropping mode according to the maximum target output power and the rest target output power, and the method comprises the following steps:
sequentially obtaining power difference values between the maximum target output power and the residual target output power to obtain at least one power difference value;
obtaining at least one wave loss proportion according to the at least one power difference value;
and carrying out wave-dropping processing on the first control signal according to at least one wave-dropping proportion to generate at least one second control signal, and controlling the resonant circuits of the rest burners according to the at least one second control signal.
In one embodiment, the control module is further configured to control the resonant circuit of the furnace end corresponding to a target output power by using a no-wave-loss method according to the target output power when the power obtaining module obtains the target output power.
In one embodiment, the heating control device further comprises:
the voltage detection module is used for detecting a voltage signal of an alternating current power supply input to the electromagnetic heating equipment;
and the control module is also connected with the voltage detection module and used for acquiring a voltage zero-crossing signal of the alternating current power supply according to the voltage signal and controlling the plurality of resonant circuits according to the voltage zero-crossing signal.
In one embodiment, the resonant circuit includes one of a double power tube half-bridge inverter circuit and a four power tube full-bridge inverter circuit.
In one embodiment, the heating control device further comprises:
and the input end of the rectifying module is connected with an alternating current power supply input to the electromagnetic heating equipment, and the output end of the rectifying module is correspondingly connected with the plurality of resonant circuits and used for converting alternating current of the alternating current power supply into preset direct current to be supplied to the plurality of resonant circuits.
In one embodiment, the heating control device further comprises:
and the input end of the EMC module is connected with an alternating current power supply, and the output end of the EMC module is connected with the input end of the rectifying module and used for suppressing interference.
In one embodiment, the heating control device further comprises:
the current surge detection module is used for collecting the working current of the electromagnetic heating equipment and outputting an overcurrent signal when the working current exceeds a preset current threshold;
and the control module is also connected with the current surge detection module and used for controlling the plurality of resonant circuits according to the overcurrent signals.
An electromagnetic heating device comprises the heating control device.
A heating control method of electromagnetic heating equipment comprises a plurality of furnace ends and a plurality of resonant circuits in one-to-one correspondence with the furnace ends, and comprises the following steps:
acquiring target output power of each burner to obtain a plurality of target output powers, and acquiring the maximum value of the plurality of target output powers to obtain the maximum target output power;
and controlling the resonant circuit of the furnace end corresponding to the maximum target output power by adopting a non-wave-loss mode according to the maximum target output power, and controlling the resonant circuits of the rest furnace ends by adopting a same-frequency wave-loss mode according to the maximum target output power and the rest target output power.
According to the electromagnetic heating equipment and the heating control device and method thereof, the target output power of each furnace end is obtained to obtain a plurality of target output powers, the maximum value of the plurality of target output powers is obtained to obtain the maximum target output power, the resonant circuit of the furnace end corresponding to the maximum target output power is controlled in a non-wave-loss mode according to the maximum target output power, and the resonant circuit of the rest furnace ends is controlled in a same-frequency wave-loss mode according to the maximum target output power and the rest target output power, so that the power requirements of all furnace ends can be met, and the problem of noise caused by too small interval of pots when a plurality of furnace ends are heated simultaneously can be effectively solved.
Drawings
FIG. 1 is a block diagram schematically illustrating a heating control device of an electromagnetic heating apparatus according to an embodiment;
FIG. 2 is an electrical schematic of a resonant circuit of the heating control device in one embodiment;
FIG. 3 is a waveform diagram illustrating the operation of an electromagnetic heating apparatus according to an embodiment;
FIG. 4 is an electrical schematic of a portion of the electrical circuit of the heating control device in one embodiment;
fig. 5 is a flowchart of a heating control method of the electromagnetic heating apparatus in one embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
In this application, electromagnetic heating equipment includes a plurality of furnace ends, and heating control device includes a plurality of resonant circuit with a plurality of furnace ends one-to-one. Specifically, electromagnetic heating equipment can be electromagnetism stove, electromagnetism kitchen etc. and the furnace end can be two, three or more, and resonant circuit can be for double-power pipe half-bridge inverter circuit or four-power pipe full-bridge inverter circuit, specifically do not do the restriction here.
For convenience of explanation, the following description will mainly use a double burner as an example. Referring to fig. 1, the electromagnetic heating device includes two burners, each burner has a corresponding resonant circuit, which is a first resonant circuit 11 and a second resonant circuit 12, and the two resonant circuits perform resonant heating on the corresponding burner.
Specifically, referring to fig. 2, the first resonant circuit 11 and the second resonant circuit 12 are both dual power transistor half-bridge inverter circuits. The first resonant circuit 11 comprises an upper bridge arm circuit and a lower bridge arm circuit, wherein the upper bridge arm circuit comprises a first power tube Q1, a first resonant capacitor CX1, a first capacitor C1 and a first resistor R1, a control end of the first power tube Q1 is connected with a first end of the first driving module 21, and a first end of the first power tube Q1 is connected with one end of the first resonant coil LX1 and a second end of the first driving module 21 respectively; one end of the first resonant capacitor CX1 is connected to the second end of the first power transistor Q1 and the first end (e.g., the positive pole 300V +) of the preset dc power supply (the voltage may be 300V) of the preset dc power supply, respectively, and the other end of the first resonant capacitor CX1 is connected to the other end of the first resonant coil LX 1; the first capacitor C1 and the first resistor R1 are connected in parallel between the first terminal and the second terminal of the first power transistor Q1. The first power Transistor Q1, the first resonant coil LX1 and the first resonant capacitor CX1 form a first series resonant tank, and the first power Transistor Q1 may be an IGBT (Insulated Gate Bipolar Transistor) or the like.
The lower bridge arm circuit comprises a second power tube Q2, a second resonant capacitor CX2, a second capacitor C2 and a second resistor R2, wherein a control end of the second power tube Q2 is connected with a third end of the first driving module 21, and a first end of the second power tube Q2 is connected with one end of the first resonant coil LX1, a second end of the first driving module 21 and a first end of the first power tube Q1 respectively; one end of the second resonance capacitor CX2 is connected to the second end of the second power tube Q2 and the second end of the preset dc power supply (for example, the negative GND of the preset dc power supply), and the other end of the second resonance capacitor CX2 is connected to the other end of the first resonance coil LX1 and the other end of the first resonance capacitor CX 1; the second capacitor C2 and the second resistor R2 are connected in parallel between the first terminal and the second terminal of the second power transistor Q2. The second power transistor Q2, the first resonant coil LX1 and the second resonant capacitor CX2 form a second series resonant circuit, and the second power transistor Q2 may be an IGBT or the like.
Further, the upper bridge arm circuit may further include a third resistor R3, a fourth resistor R4, and a first zener diode DW1, where the third resistor R3 is connected in series between the control terminal of the first power transistor Q1 and the first end of the first driving module 21, the fourth resistor R4 and the first zener diode DW1 are connected in parallel between the control terminal of the first power transistor Q1 and the first end of the first power transistor Q1, and a cathode of the first zener diode DW1 is connected to the control terminal of the first power transistor Q1. The lower bridge arm circuit may further include a fifth resistor R5, a sixth resistor R6, and a second zener diode DW2, wherein the fifth resistor R5 is connected in series between the control terminal of the second power transistor Q2 and the third terminal of the first driving module 21, the sixth resistor R6 and the second zener diode DW2 are connected in parallel between the control terminal of the second power transistor Q2 and the first terminal of the second power transistor Q2, and a cathode of the second zener diode DW2 is connected to the control terminal of the second power transistor Q2.
It should be noted that the second resonant circuit 12 and the first resonant circuit 11 have the same structure, and detailed description thereof is omitted here.
Further, referring to fig. 1, the heating control device further includes a rectifying module 30, an input end of the rectifying module 30 is connected to an ac power (L, N) input to the electromagnetic heating apparatus, and an output end of the rectifying module 30 is correspondingly connected to the plurality of resonant circuits, for converting an ac power of the ac power into a preset dc power and supplying the preset dc power to the plurality of resonant circuits.
Specifically, a filter capacitor, such as an eighth capacitor C8 shown in fig. 4, is also connected in parallel to the output end of the rectifier module 30 for filtering the dc power output by the rectifier module 30 to convert the pulsating dc power into a stable dc power, and the output end of the rectifier module 30 is also connected to the plurality of resonant circuits, for example, referring to fig. 2, the output end of the rectifier module 30 is connected to the power input end of the first resonant circuit 11 and the power input end of the second resonant circuit 12, and is used for converting the ac power of the ac power into a preset dc power to power the first resonant circuit 11 and the second resonant circuit 12. Because a plurality of resonant circuit connect the output at same rectifier module 30, therefore can effectively avoid when a plurality of resonant circuit do not connect the output at same rectifier module, because of the filter capacitor energy storage leads to when stopping power the filter capacitor charge to maximum voltage, can produce the problem emergence of noise during the start to realize the small-noise and start power.
Further, with continued reference to fig. 1, the heating control device further includes a power harvesting module (not specifically shown) and a control module 40. The power acquisition module is used for acquiring target output power of each furnace end to obtain a plurality of target output powers and acquiring the maximum value of the plurality of target output powers to obtain the maximum target output power; the control module 40 is connected to the power obtaining module and the plurality of resonant circuits respectively, and is configured to control the resonant circuit of the furnace end corresponding to the maximum target output power in a non-loss mode according to the maximum target output power, and control the resonant circuits of the remaining furnace ends in a same-frequency loss mode according to the maximum target output power and the remaining target output power.
Specifically, when the electromagnetic heating device includes a power selection key, the power obtaining module may be connected to the power selection key, so as to obtain a target output power of a corresponding furnace end by obtaining an output signal/state of the power selection key when a user sets the power of the furnace end of the electromagnetic heating device through the power selection key; when the electromagnetic heating equipment comprises the communication module and a user can set the power of the electromagnetic heating equipment through a mobile terminal (such as a mobile phone), the power acquisition module can communicate with the communication module, so that when the user sets the power of the furnace end of the electromagnetic heating equipment through the mobile terminal, the target output power of the corresponding furnace end is obtained through communication with the communication module. Of course, other manners may be adopted, and specific limitations are not limited herein as long as the target output power of each burner can be accurately obtained.
Assuming that the current user needs two burners of the electromagnetic heating device to heat simultaneously, the power obtaining module obtains two target output powers, which are the first target output power PS1 and the second target output power PS2, respectively, and then compares and determines the magnitude relationship between the two to determine the maximum target output power, assuming that the maximum target output power is PS1, and correspondingly transmits the maximum target output power PS1, the second target output power PS2, and the numbers of the corresponding burners to the control module 40. After receiving the data information, the control module 40 firstly controls the resonant circuit of the furnace end corresponding to the maximum target output power PS1 in a non-wave-loss manner according to the maximum target output power PS1, and simultaneously controls the resonant circuit of the furnace end corresponding to the second target output power PS2 in a same-frequency wave-loss manner according to the maximum target output power PS1 and the second target output power PS2, thereby realizing simultaneous resonant heating of the two furnace ends.
In this embodiment, because every furnace end all controls corresponding resonant circuit according to its target output who corresponds to realize the resonant heating, therefore can satisfy the power demand of all furnace ends, use the biggest target output as the basis simultaneously, adopt the same frequency to lose the ripples mode and control remaining furnace ends, make all resonant circuit's control signal's width the same, thereby effectively solved when many furnace ends heat simultaneously because of the pan interval too little problem that produces the noise, improved user experience greatly.
In one embodiment, the controlling module 40 controls the resonant circuit of the furnace end corresponding to the maximum target output power in a non-wave-loss manner according to the maximum target output power includes: and generating a first control signal according to the maximum target output power, and controlling the resonant circuit of the furnace end corresponding to the maximum target output power according to the first control signal. Further, the controlling module 40 controls the resonant circuit of the remaining burner in a same-frequency wave-dropping manner according to the maximum target output power and the remaining target output power, including: sequentially obtaining power difference values between the maximum target output power and the residual target output power to obtain at least one power difference value; obtaining at least one wave loss proportion according to the at least one power difference value; and carrying out wave-dropping processing on the first control signal according to at least one wave-dropping proportion to generate at least one second control signal, and controlling the resonant circuits of the rest burners according to the at least one second control signal.
Specifically, the two burners are heated simultaneously as an example. The control module 40 may generate a first control signal according to the maximum target output power PS1, where the first control signal may be a PWM (Pulse Width Modulation) driving signal or a PPG (Programmable Pulse Generator) driving signal, and the first control signal controls the resonant circuit of the burner corresponding to the maximum target output power PS 1. Meanwhile, the control module 40 calculates a power difference Δ PS2 between the obtained maximum target output power PS1 and the second target output power PS2 to be PS1-PS2, obtains a wave-dropping proportion according to the power difference Δ PS2, performs wave-dropping processing on the first control signal according to the wave-dropping proportion to generate a second control signal, and controls the resonant circuit of the furnace end corresponding to the second target output power PS2 according to the second control signal, thereby realizing the same-frequency resonant heating of the two furnace ends.
In practical application, the corresponding wave-loss proportion can be determined in advance according to the power difference, then the power difference and the wave-loss proportion are correspondingly stored in the control module 40 or a memory connected with the control module 40, and during heating control, the control module 40 directly reads the corresponding wave-loss proportion from the memory according to the power difference; or, a functional relation between the power difference and the wave-loss ratio is pre-established, and then stored in the control module 40, and the control module 40 calculates and obtains the corresponding wave-loss ratio according to the power difference during heating control. Of course, other acquisition manners may be adopted, and are not limited herein. In particular, when the target output powers of the plurality of burners are the same, the corresponding wave loss ratio is zero.
Fig. 3 is a waveform diagram illustrating the operation of the electromagnetic heating apparatus according to an embodiment, and referring to fig. 3, a waveform a is a voltage waveform of an ac power supply; the waveform B is the voltage waveform of the rectified resonant circuit when the resonant circuit does not work, namely the voltage waveform of the collector of the power tube when the resonant circuit does not work; the waveform C is the voltage waveform of the rectified resonant circuit during working, namely the voltage waveform of the collector of the power tube during working of the resonant circuit; the waveform D is a waveform of the first control signal (e.g., a PWM driving signal), that is, a driving waveform of the resonant circuit of the furnace end corresponding to the maximum target output power PS1, and the entire waveform is in a continuous state, that is, no wave loss occurs; the waveform E is a waveform of the second control signal, that is, a driving waveform of the resonant circuit of the furnace end corresponding to the second target output power PS2, and the entire waveform is in an intermittent state, that is, there is a wave loss and the wave loss ratio is 50%. As can be seen from fig. 3, the control module 40 may always output the PWM driving signal to the resonant circuit of the burner corresponding to the maximum target output power PS1, so as to achieve continuous power output of the burner, and at the same time intermittently output the PWM driving signal to the resonant circuit of the burner corresponding to the second target output power PS2, so as to achieve intermittent power output of the burner, such as 1/2 cycle output, where the output power is half of the maximum target output power PS1 when other conditions are the same. The widths of the PWM driving signals are the same, so that difference frequency noise cannot be generated, and the problem that noise is generated due to too small interval of a cooker when multiple burner are heated simultaneously is effectively solved.
In this embodiment, through generating first control signal according to maximum target output power, in order to control the resonant circuit of corresponding furnace end, obtain the proportion of losing waves simultaneously according to the power difference, and lose the wave to handle and generate the second control signal to first control signal according to the proportion of losing waves, because this second control signal is the same with the width of first control signal, thereby can effectively solve the problem that produces the noise because of the pan interval is too little when many furnace ends heat simultaneously, simultaneously because the control signal of every furnace end all obtains according to corresponding target output power, therefore can satisfy the power demand of all furnace ends.
In one embodiment, the control module 40 is further configured to, when the power obtaining module obtains a target output power, control the resonant circuit of the furnace end corresponding to the target output power in a non-wave-loss manner according to the target output power. That is, when only one burner is required to heat, the control module 40 directly generates a control signal according to the target output power corresponding to the burner, and controls the resonant circuit of the corresponding burner according to the control signal, so as to realize resonant heating. For example, when only the burner corresponding to the first target output power PS1 is required to be heated, the control module 40 generates a first control signal according to the first target output power PS1, and controls the resonant circuit of the burner corresponding to the first target output power PS1 according to the first control signal.
In one embodiment, as shown with reference to fig. 1, the heating control device further includes: the control module 40 is further connected to the voltage detection module 50, and is configured to obtain a voltage zero-crossing signal of the ac power according to the voltage signal, and control the resonant circuit according to the voltage zero-crossing signal.
Further, referring to fig. 4, the voltage detection module 50 may include: the circuit comprises a full-wave rectifier bridge, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a third capacitor C3. The full-wave rectifier bridge comprises a first diode D1 and a second diode D2, wherein the anode of the first diode D1 is connected with one end (such as L) of an alternating current power supply input to the electromagnetic heating equipment, the anode of the second diode D2 is connected with the other end (such as N) of the alternating current power supply, the cathode of the first diode D1 is connected with the cathode of the second diode D2 to serve as an output end of the full-wave rectifier bridge, and the full-wave rectifier bridge is used for converting alternating current of the alternating current power supply into direct current; the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are connected in series between the output end of the full-wave rectifier bridge and the ground end GND, the third capacitor C3 is connected in parallel with the tenth resistor R10, a first connection point is arranged between the ninth resistor R9 and the tenth resistor R10, the first connection point is connected with the voltage detection end of the control module 40, and the control module 40 acquires a voltage zero-crossing signal according to the voltage of the first connection point.
It should be noted that the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the tenth resistor R10 are mainly used for voltage division, and the number of specific resistors may be selected according to actual requirements, which is not limited herein.
When the control module 40 controls the resonant circuit, the on-off control of the power tube in the resonant circuit is performed according to the voltage zero-crossing signal, so as to realize zero-voltage switching-on and zero-voltage switching-off of the power tube, effectively reduce switching-on noise and switching-off noise, and realize low-noise starting power.
Specifically, the two burners are heated simultaneously as an example. The control module 40 generates a first control signal according to the maximum target output power PS1, for example, a PWM driving signal corresponding to the waveform D shown in fig. 3, controls the power tube of the resonant circuit of the corresponding burner according to the first control signal to achieve continuous power output, meanwhile, obtains a corresponding wave-loss ratio according to a power difference Δ PS between the maximum target output power PS1 and the second target output power PS2, performs wave-loss processing on the first control signal according to the wave-loss ratio to generate a second control signal, for example, a PWM driving signal corresponding to the waveform E shown in fig. 3, and controls the power tube of the resonant circuit of the corresponding burner to be turned on and off at a voltage zero-crossing point of the ac power supply according to the second control signal to achieve intermittent power output.
In this embodiment, since the power tube of the resonant circuit of the furnace end corresponding to the second target output power is always turned on and off at the zero crossing point of the voltage of the ac power supply, the power generation with low noise can be realized, and since the control signals of the two furnace ends are the same as the width of the PWM driving signal, the difference frequency noise is not generated, thereby effectively solving the problem of noise generation caused by too small interval between cookers when the multiple furnace ends are simultaneously heated.
It should be noted that, when the resonant circuit is a double-power-tube half-bridge inverter circuit or a four-power-tube full-bridge inverter circuit, the on and off of a plurality of power tubes in the resonant circuit are controlled by outputting control signals in a complementary form, such as PWM driving signals, so as to achieve the balanced on and off of the power tubes, ensure the operational reliability of the power tubes, and further ensure the operational reliability of the resonant circuit.
In one embodiment, as shown with reference to fig. 1, the heating control device further includes: EMC module 60, the input of EMC module 60 links to each other with AC power supply, and the output of EMC module 60 links to each other with the input of rectifier module 30 for interference suppression to the filtering is from the external electromagnetic interference that AC power supply introduced, avoids electromagnetic heating equipment outwards to send noise interference simultaneously, influences the normal work of other electronic equipment under the same electromagnetic environment.
Further, referring to fig. 4, the EMC module 60 includes a common mode filter 61, and may specifically include a fourth capacitor C4, a fifth capacitor C5, an eleventh resistor R11, a twelfth resistor R12, a magnetic loop T1, and a sixth capacitor C6. The eleventh resistor R11 and the twelfth resistor R12 are connected in series and then connected between two ends of the alternating current power supply in parallel with the fourth capacitor C4 and the fifth capacitor C5; the first end of the magnetic ring T1 is connected with one end of an alternating current power supply, the second end of the magnetic ring T1 is connected with the other end of the alternating current power supply, and the third end and the fourth end of the magnetic ring T1 are correspondingly connected with the input end of the rectifying module 30; and the sixth capacitor C6 is connected in parallel between the third terminal and the fourth terminal of the magnetic ring T1. The common mode filter 61 is used to suppress common mode interference to meet the electromagnetic compatibility requirement.
Further, as shown in fig. 4, the EMC module 60 includes a differential mode filter 62, and specifically includes a first inductor L1 and a seventh capacitor C7, one end of the first inductor L1 is connected to the fourth end of the magnetic loop T1, the other end of the first inductor L1 is connected to the first input end of the rectifier module 30, one end of the seventh capacitor C7 is connected to the first input end of the rectifier module 30, and the other end of the seventh capacitor C7 is connected to the second input end of the rectifier module 30. The differential mode filter 62 is used to suppress differential mode interference to meet electromagnetic compatibility requirements.
Furthermore, the heating control device also comprises a plurality of filtering modules, and each filtering module is connected between the power supply input ends of the corresponding resonant circuits so as to filter the direct current input to the plurality of resonant circuits and reduce differential mode interference. Taking the first filtering module 71 as an example, the module is an LC filtering circuit composed of a second inductor L2 and a ninth capacitor C9.
In one embodiment, referring to fig. 1, the heating control apparatus further includes a current surge detection module 80 for collecting an operating current of the electromagnetic heating device and outputting an overcurrent signal when the operating current exceeds a preset current threshold, and the control module 40 is further connected to the current surge detection module 80 for controlling the plurality of resonant circuits according to the overcurrent signal to perform overcurrent protection on the electromagnetic heating device.
Further, referring to fig. 4, the current surge detection module 80 includes a plurality of first current detection circuits 81, a plurality of first voltage comparison circuits (not specifically shown in the figure) corresponding to the plurality of first current detection circuits 81, a second current detection circuit 82, a second voltage comparison circuit corresponding to the second current detection circuit 82, and an and logic circuit (not specifically shown in the figure). The input ends of the first current detection circuits 81 are correspondingly connected to the resonant circuits, and are used for detecting the resonant current of each resonant circuit; the input ends of the plurality of first voltage comparison circuits are correspondingly connected with the output ends of the plurality of first current detection circuits 81, and are used for comparing the resonant current of each resonant circuit and outputting a high-level signal when the resonant current is greater than a first preset current threshold; the input end of the second current detection circuit 82 is connected with the alternating current power supply input to the electromagnetic heating device and is used for detecting the total current of the electromagnetic heating device; the input end of the second voltage comparison circuit is connected with the output end of the second current detection circuit 82, and is used for outputting a high-level signal when the total current of the electromagnetic heating equipment is greater than a second preset current threshold value; the input end of the logic circuit is connected with the output ends of the plurality of first voltage comparison circuits and the output end of the second voltage comparison circuit, the output end of the logic circuit is connected with the current detection end of the control module 40 and used for outputting a high level signal to the control module 40 when at least one high level signal is received, the control module 40 judges that the electromagnetic heating equipment is in an overcurrent state according to the high level signal, and at the moment, the resonance circuit is controlled to stop working so as to perform overcurrent protection on the electromagnetic heating equipment.
Further, referring to fig. 4, the first current detection module 81 includes: a first current transformer ET1, a thirteenth resistor R13 and a fourteenth resistor R14. A first input end of a first current transformer ET1 is connected with the other end of the first resonance coil LX1, a second input end of a first current transformer ET1 is respectively connected with the other end of the first resonance capacitor CX1 and the other end of the second resonance capacitor CX2, and a first output end and a second output end of a first current transformer ET1 are connected with input ends of corresponding first voltage comparison circuits; a thirteenth resistor R13 and a fourteenth resistor R14 are connected in parallel between the first output terminal and the second output terminal of the first current transformer ET 1.
The second current detection module 82 includes: a second current transformer ET2, a fifteenth resistor R15 and a sixteenth resistor R16. A first input end and a second input end of a second current transformer ET2 are connected in series in an alternating current loop of an alternating current power supply, and a first output end and a second output end of a second current transformer ET2 are connected with an input end of a second voltage comparison circuit; a fifteenth resistor R15 and a sixteenth resistor R16 are connected in parallel between the first output terminal and the second output terminal of the second current transformer ET 2.
The first voltage comparison circuit and the second voltage comparison circuit may be formed by a voltage divider circuit, a comparator and peripheral circuits thereof, the logic circuit may be formed by an or gate circuit, and of course, other circuit structures may be adopted, which is not limited herein. In addition, a first voltage comparison circuit, a second voltage comparison circuit and a logic circuit may also be omitted, and then the first voltage comparison circuit, the second voltage comparison circuit and the logic circuit are respectively connected with the control module 40 through voltage division circuits, and the control module 40 realizes the acquisition, conversion and comparison of the voltage, and specifically which mode is adopted is not limited here.
In this embodiment, the overcurrent protection of the resonant circuit is realized by detecting the working current of the electromagnetic heating device and controlling the resonant circuit to stop working when the working current is greater than the preset current threshold.
To sum up, the heating control device of the electromagnetic heating equipment of this application not only can satisfy the power demand of all furnace ends, can effectively solve the problem that produces the noise because of the pan interval is too little when many furnace ends heat simultaneously moreover, can realize the overcurrent protection to electromagnetic heating equipment simultaneously to and accord with the electromagnetic compatibility requirement.
The application also provides an electromagnetic heating device which comprises the heating control device.
The present application further provides a heating control method of an electromagnetic heating device, where the electromagnetic heating device includes a plurality of furnace ends and a plurality of resonant circuits corresponding to the plurality of furnace ends one to one, and as shown in fig. 5, the heating control method of the electromagnetic heating device includes:
s502, obtaining a target output power of each burner to obtain a plurality of target output powers, and obtaining a maximum value of the plurality of target output powers to obtain a maximum target output power.
S504, controlling the resonant circuit of the furnace end corresponding to the maximum target output power in a non-wave-loss mode according to the maximum target output power, and correspondingly controlling the resonant circuits of the rest furnace ends in a same-frequency wave-loss mode according to the maximum target output power and the rest target output power.
In one embodiment, the controlling the resonant circuit of the furnace end corresponding to the maximum target output power in a non-wave-loss manner according to the maximum target output power includes: and generating a first control signal according to the maximum target output power, and controlling the resonant circuit of the furnace end corresponding to the maximum target output power according to the first control signal. Further, controlling the resonant circuit of the rest burner by adopting a same-frequency wave-dropping mode according to the maximum target output power and the rest target output power, comprising the following steps: sequentially obtaining power difference values between the maximum target output power and the residual target output power to obtain at least one power difference value; obtaining at least one wave loss proportion according to the at least one power difference value; and carrying out wave-dropping processing on the first control signal according to at least one wave-dropping proportion to generate at least one second control signal, and controlling the resonant circuits of the rest burners according to the at least one second control signal.
In one embodiment, the heating control method further includes: and when a target output power is obtained, controlling the resonant circuit of the furnace end corresponding to the target output power in a non-wave-loss mode according to the target output power.
In one embodiment, the heating control method further includes: detecting a voltage zero-crossing signal of an alternating current power supply input to the electromagnetic heating device; the plurality of resonant circuits are controlled in accordance with the voltage zero crossing signal.
In one embodiment, the heating control method further includes: collecting the working current of the electromagnetic heating equipment, and outputting an overcurrent signal when the working current exceeds a preset current threshold; the plurality of resonant circuits are controlled in accordance with an overcurrent signal.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides an electromagnetic heating equipment's heating control device, its characterized in that, electromagnetic heating equipment includes a plurality of furnace ends, heating control device include with a plurality of resonant circuit of a plurality of furnace ends one-to-one, heating control device still includes:
the power acquisition module is used for acquiring the target output power of each burner to obtain a plurality of target output powers and acquiring the maximum value of the target output powers to obtain the maximum target output power;
and the control module is connected with the power acquisition module and the plurality of resonant circuits respectively and is used for controlling the resonant circuit of the furnace end corresponding to the maximum target output power in a non-wave-loss mode according to the maximum target output power and controlling the resonant circuits of the rest furnace ends in a same-frequency wave-loss mode according to the maximum target output power and the rest target output power.
2. The heating control device of the electromagnetic heating apparatus according to claim 1, wherein the control module controls the resonant circuit of the burner corresponding to the maximum target output power in a non-wave-loss manner according to the maximum target output power, and includes:
generating a first control signal according to the maximum target output power, and controlling a resonant circuit of the furnace end corresponding to the maximum target output power according to the first control signal;
the control module controls the resonant circuit of the rest furnace end in a same-frequency wave-dropping mode according to the maximum target output power and the rest target output power, and the control module comprises:
sequentially obtaining power difference values between the maximum target output power and the residual target output power to obtain at least one power difference value;
obtaining at least one wave loss proportion according to the at least one power difference value;
and carrying out wave-dropping processing on the first control signal according to the at least one wave-dropping proportion to generate at least one second control signal, and controlling the resonant circuits of the rest burners according to the at least one second control signal.
3. The heating control device of the electromagnetic heating apparatus as claimed in claim 1, wherein the control module is further configured to control the resonant circuit of the burner corresponding to the target output power in a non-wave-loss manner according to the target output power when the power obtaining module obtains the target output power.
4. A heating control device of an electromagnetic heating apparatus according to any one of claims 1 to 3, characterized by further comprising:
the voltage detection module is used for detecting a voltage signal of an alternating current power supply input to the electromagnetic heating equipment;
the control module is also connected with the voltage detection module and used for acquiring a voltage zero-crossing signal of the alternating current power supply according to the voltage signal and controlling the plurality of resonant circuits according to the voltage zero-crossing signal.
5. The heating control device of an electromagnetic heating apparatus according to claim 1, wherein the resonant circuit comprises one of a double power tube half-bridge inverter circuit and a four power tube full-bridge inverter circuit.
6. A heating control device of an electromagnetic heating apparatus according to claim 1, characterized by further comprising:
and the input end of the rectifying module is connected with an alternating current power supply input to the electromagnetic heating equipment, and the output end of the rectifying module is correspondingly connected with the plurality of resonant circuits and used for converting alternating current of the alternating current power supply into preset direct current to be supplied to the plurality of resonant circuits.
7. The heating control device of an electromagnetic heating apparatus according to claim 6, characterized by further comprising:
and the input end of the EMC module is connected with the alternating current power supply, and the output end of the EMC module is connected with the input end of the rectifying module and used for suppressing interference.
8. A heating control device of an electromagnetic heating apparatus according to claim 1, characterized by further comprising:
the current surge detection module is used for collecting the working current of the electromagnetic heating equipment and outputting an overcurrent signal when the working current exceeds a preset current threshold;
the control module is further connected with the current surge detection module and used for controlling the plurality of resonant circuits according to the overcurrent signal.
9. An electromagnetic heating apparatus, characterized by comprising a heating control device according to any one of claims 1-8.
10. A heating control method of an electromagnetic heating device, wherein the electromagnetic heating device comprises a plurality of furnace ends and a plurality of resonant circuits corresponding to the furnace ends one to one, the control method comprising:
acquiring a target output power of each burner to obtain a plurality of target output powers, and acquiring a maximum value of the plurality of target output powers to obtain a maximum target output power;
and controlling the resonant circuit of the furnace end corresponding to the maximum target output power in a non-wave-loss mode according to the maximum target output power, and controlling the resonant circuits of the rest furnace ends in a same-frequency wave-loss mode according to the maximum target output power and the rest target output power.
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| CN112113246A (en) * | 2020-08-27 | 2020-12-22 | 中山爱它电器科技有限公司 | Noise reduction method and control device for multi-head induction cooker |
| CN114698172B (en) * | 2020-12-29 | 2023-01-24 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment and power control method and power control device thereof |
| CN114698170B (en) * | 2020-12-29 | 2024-05-17 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment, power distribution method and power distribution device thereof |
| CN114390737B (en) * | 2021-12-17 | 2024-06-07 | 广东美的白色家电技术创新中心有限公司 | Power control circuit and power control method of electromagnetic heating device |
| CN116546682B (en) * | 2023-06-19 | 2024-01-09 | 昂策(佛山)电子有限公司 | Induction cooker resonance power control method and device and induction cooker |
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