CN109905932A - A kind of Poewr control method of electromagnetic heater - Google Patents
A kind of Poewr control method of electromagnetic heater Download PDFInfo
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- CN109905932A CN109905932A CN201910186500.1A CN201910186500A CN109905932A CN 109905932 A CN109905932 A CN 109905932A CN 201910186500 A CN201910186500 A CN 201910186500A CN 109905932 A CN109905932 A CN 109905932A
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- wave
- rectification
- circuit
- electromagnetic heater
- control method
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
Abstract
The present invention provides a kind of Poewr control method of electromagnetic heater, it include: to judge whether target heating power is greater than preset value, when target heating power is greater than preset value, to control rectification circuit output current waveform in full-wave rectifier, controller issues control signal driving power pipe and is connected so that resonance circuit works adjustment switching circuit；When target heating power is less than preset value, adjustment switching circuit is to control rectification circuit output half wave rectification wave, and at the subsequent t1 moment, controller issues the conducting of control signal driving power pipe so that resonance circuit works, wherein the t1 moment be the half wave rectification wave without waveform output at the time of, or at the time of at least lived through after the half wave cycles without waveform for the half wave rectification wave.It can guarantee that IGBT is open-minded under no-voltage or low-voltage in low-power heating, the service life for reducing noise, promoting IGBT.
Description
Technical field
The present invention relates to kitchen appliance technical field more particularly to a kind of Poewr control methods of electromagnetic heater.
Background technique
The principle of heating of electromagnetic heater is to generate alternating magnetic field by electromagnetic heater, the iron being placed in alternating magnetic field
Magnetic material self-heating due to induction.It is relatively conventional using electromagnetic heating in cooking apparatus, such as electromagnetic oven, IH rice cooker, it adopts
With the cooking apparatus of electromagnetic heating because its thermal efficiency is high, cleaning, facilitate due to be greatly favored by consumers.The cooking apparatus of electromagnetic heating needs
EMR electromagnetic resonance is realized using IGBT alternating on-off, in high-power heating, IGBT working condition is preferable, but in low-power heating
When, there are relatively high voltages at the both ends of IGBT.The small-power stage is by the way of intermittent-heating, as shown in Figure 1, such as existing
In the previous section period of T1 and T2, IGBT is not open-minded, heats without EMR electromagnetic resonance, in the aft section period of T2
IGBT, which is opened, carries out EMR electromagnetic resonance heating, and the reduction of mean power is realized by way of this intermittent-heating, that is, realizes small function
Rate.Due within the T1 period, alternating current is to the capacitor charging of circuit, so that the voltage stabilization at the both ends IGBT is V1 at this time,
Theoretical value is 311V, and IGBT is opened at this voltage can generate very big electric current, to generate noise, influences user experience, together
When because of IGBT open the bigger service life that can greatly reduce IGBT of electric current.
Thus, it is necessory to provide a kind of technical solution, to overcome the problems of the above-mentioned prior art.
Summary of the invention
Technical problem to be solved by the present invention lies in overcome the deficiencies in the prior art, and provide a kind of electromagnetic heater
Poewr control method, can guarantee that IGBT is open-minded under no-voltage or low-voltage in low-power heating, reduce noise, promoted
The service life of IGBT.
In order to achieve the above object, technical scheme is as follows:
A kind of Poewr control method of electromagnetic heater, the electromagnetic heater includes controller, switching circuit, whole
Current circuit, resonance circuit and power tube, the rectification circuit is to AC rectification, the switching circuit and the rectification
Circuit is connected, and is switched with controlling the rectification circuit between output current waveform in full-wave rectifier and half wave rectification wave, the control
Method includes: to judge whether target heating power is greater than preset value, when target heating power is greater than preset value, adjusts switching electricity
To control rectification circuit output current waveform in full-wave rectifier, controller issues control signal driving power pipe conducting so that resonance circuit on road
Work；When target heating power is less than preset value, adjustment switching circuit exports half wave rectification wave to control rectification circuit, and
At the subsequent t1 moment, controller issues the conducting of control signal driving power pipe so that resonance circuit works, wherein the t1
Moment is that the half wave rectification wave at least lives through one at the time of output without waveform, or for the half wave rectification wave
At the time of after half wave cycles without waveform.
Technical solution as a further improvement of that present invention, the t1 moment are the defeated without waveform of the half wave rectification wave
At the time of out, and the t1 is less than 10ms.
Technical solution as a further improvement of that present invention, the controller issue control signal driving power pipe conducting
When, the voltage between the collector and emitter of the power tube is zero.
Technical solution as a further improvement of that present invention, the t1 moment are that the half wave rectification wave at least lives through
At the time of after one half wave cycles without waveform, and the controller issues when controlling the conducting of signal driving power pipe, described
Voltage between the collector and emitter of power tube is 100V-200V.
Technical solution as a further improvement of that present invention, the t1 moment are that the half wave rectification wave at least lives through
At the time of after one half wave cycles without waveform, and the controller issues when controlling the conducting of signal driving power pipe, described
Voltage between the collector and emitter of power tube is 140V-160V.
Technical solution as a further improvement of that present invention, the preset value are the rated power of the electromagnetic heater
Half.
Technical solution as a further improvement of that present invention, the switching circuit include relay or MOSFET pipe.
Technical solution as a further improvement of that present invention, the electromagnetic heater includes voltage detecting circuit, described
The input terminal of voltage detecting circuit is connected to the alternating current before the rectification circuit, and the output end of the voltage detecting circuit connects
It is connected to the controller.
Technical solution as a further improvement of that present invention, the rectification circuit include four diodes.
Technical solution as a further improvement of that present invention further includes inspection pot step, and the inspection pot step is in full-wave rectification
It is carried out under waveform.
The Poewr control method of electromagnetic heater provided by the invention has the following beneficial effects:
For the technical program by switching circuit, the waveform that rectification circuit is exported is current waveform in full-wave rectifier or half-wave
Rectified waveform, and power tube is opened into control in half wave rectification wave without waveform output time in the low-power heating stage,
Both end voltage is 0V when realizing that power tube is opened；Power tube is either opened into control in half-wave in the low-power heating stage
At the time of rectified waveform at least lives through after the half wave cycles without waveform, both end voltage when power tube is opened is lower,
So that power tube opens current reduction, there is the service life technical effect for reducing noise and promoting IGBT.
Control process includes inspection pot step, to ensure the presence of cookware；Inspection pot step carries out under current waveform in full-wave rectifier, can
To improve inspection pot efficiency and accuracy, avoid generating the inspection pot time because examining not cookware without the wave stage under half wave rectification wave
It is too long or make the erroneous judgement that cookware is not present.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to needed for embodiment
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is the alternating current of the Poewr control method of electromagnetic heater and power tube both end voltage waveform in the prior art
Figure.
Fig. 2 is the circuit diagram applied in one embodiment of Poewr control method of electromagnetic heater of the present invention.
Fig. 3 is the alternating current and power tube both end voltage of one embodiment of Poewr control method of electromagnetic heater of the present invention
Waveform diagram.
Fig. 4 is the alternating current and power tube both ends electricity of another embodiment of Poewr control method of electromagnetic heater of the present invention
Corrugating figure.
Appended drawing reference:
1- controller；2- switching circuit；3- rectification circuit；4- resonance circuit；5- power tube；6- voltage detecting circuit.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 2, it is the circuit diagram applied in one embodiment of Poewr control method of electromagnetic heater of the present invention.
The electromagnetic heater includes controller 1, switching circuit 2, rectification circuit 3, resonance circuit 4 and power tube 5, the rectification
Circuit 3 is existed with controlling the rectification circuit 3 to AC rectification, the switching circuit 2 is connected with the rectification circuit 3
Switch between output current waveform in full-wave rectifier and half wave rectification wave.
Specifically, the rectification circuit 3 is connected to mains AC, rectification circuit 3 include four diode D1, D2, D3,
D4, wherein the anode of diode D1 is connected with the cathode of diode D3, the anode of diode D2 is connected with the cathode of diode D4,
The cathode of diode D1 and the cathode of diode D2 are connected, the anode of diode D3 is connected with the anode of diode D4, and alternating current is handed over
One end of galvanic electricity is connected to the cathode of the anode of the diode D1, diode D3, the other end be connected to diode D2 anode,
The cathode of diode D4.The switching circuit includes relay or MOSFET pipe, and the switching circuit includes that can select a connection
Two branches, one of branch are connected to the cathode of the anode of the diode D2, diode D4, and another branch is connected to two
The anode of the anode of pole pipe D3, diode D4.The cathode of the diode D1 be connected with the cathode of diode D2 after by inductance
It is connected to switching circuit after L1, capacitor C2, resistance R3, is formed into a loop.
The power tube 5 is IGBT in the present embodiment, in parallel with capacitor C2, the collector and capacitor C2 of power tube 5
One end between be connected with resonant capacitance C3, the emitter of power tube 5 is connected and is grounded with the other end of capacitor C2.Resonance circuit
4 include drum and the resonant capacitance C3, and the both ends of the drum are in parallel with the both ends of the resonant capacitance C3.
The electromagnetic induction heater further includes the conditioning circuit to carry out voltage sample, and to carry out zero electricity
Press the voltage detecting circuit of detection.The zero curve and firewire of the mains AC respectively after diode a D5 and D6, pass through
Divider resistance R1 and R2 ground connection, one end of conditioning circuit are connected between divider resistance R1 and R2, and the other end is connected to controller
1.The input terminal of the voltage detecting circuit 6 is connected to the mains AC before the rectification circuit 3, the voltage detecting electricity
The output end on road 6 is connected to the controller 1.
The controller 1 is MCU comprising multiple ports.In the present embodiment, the controller 1 includes current sample
Port, driving signal port, voltage sample port, no-voltage detection port, PPG signal port and two synchronization signal ends
Mouthful, the current sample port is connected to the tie point of resistance R3 Yu switching circuit 2, and the driving signal port is connected to switching
Circuit 2 switches between two branches to control switching circuit 2, and the voltage sample port is connected with conditioning circuit, described
No-voltage detection port is connected with the voltage detecting circuit 6, and the PPG signal port is connected to the control of the power tube 5
Pole, described two synchronous signal ports are then connected with the both ends of drum and resonant capacitance C3 respectively.
The Poewr control method of electromagnetic heater of the present invention, the controlling party are introduced referring to above-described circuit
Method includes: to judge whether target heating power is greater than preset value, when target heating power is greater than preset value, adjustment switching circuit
2 export current waveform in full-wave rectifier to control rectification circuit 3, and controller 1 issues the control conducting of signal driving power pipe 5 so that resonance is electric
Road 4 works；When target heating power is less than preset value, adjustment switching circuit 2 exports halfwave rectifier wave to control rectification circuit 3
Shape, and at the subsequent t1 moment, controller 1 issues the conducting of control signal driving power pipe 5 so that resonance circuit 4 works.
Referring to Fig. 3, alternating current is sine wave alternating current, when target power is greater than preset value, i.e., currently add to be high-power
Hot stage, switching circuit 2 connect the branch on the top in circuit as shown in Figure 2, and rectification circuit 3 exports full-wave rectification ripple at this time
Shape, controller 1 export opening for PPG signal control power tube 5 by PPG signal port and turn off to realize the humorous of resonance circuit 4
Vibration heating.Voltage V during this, between the collector and emitter of power tube 5CEHigh-power rank in waveform diagram such as Fig. 3
Shown in section.It when target power is less than preset value, i.e., is currently the low-power heating stage, switching circuit 2 is connected as shown in Figure 2
The branch of lower part in circuit, rectification circuit 3 exports half wave rectification wave, the i.e. wave of the negative half-cycle of mains AC at this time
Shape is filtered after rectified, the output of no waveform, by high-power first be switched to after small-power without waveform output when
Between section when, controller 1 by PPG signal port issue PPG signal control power tube 5 be connected, at this time the collector of power tube 5 with
Voltage V between emitterCEIt is zero, power tube 5 is open-minded under no-voltage, and electric current is smaller, noise is small, rush of current is small, power
Pipe long service life.Voltage V during this, between the collector and emitter of power tube 5CEIt is small in waveform diagram such as Fig. 3
Shown in power phase.Wherein the t1 moment is any moment in the T1 period.It is half wave rectification wave within the T1 period
Without waveform output period, T1 be half of ac period be 10ms, the t1 be less than 10ms.
Referring to Fig. 4, it is the waveform diagram of another embodiment of Poewr control method.Its with embodiment shown in Fig. 3 not
Same to be, the present embodiment is the situation for the time that power tube 5 turns off being greater than 10ms.In the present embodiment, the t1 moment is warp
At the time of having gone through after T1, T2, T3, i.e., it is later that the described half wave rectification wave at least lives through the half wave cycles without waveform
At the moment, when the controller 1 issues the control conducting of signal driving power pipe 5 at this time, due to living through in the T2 period, alternating current is handed over
Galvanic electricity charges to stable state to capacitor C2, and the both ends of power tube 5 have had voltage at this time, but exported due to rectification circuit 3
For half wave rectification wave, the voltage at 5 both ends of power tube is about half of current waveform in full-wave rectifier voltage.Referring to FIG. 1, being handed over 220V
For flowing alternating current, the voltage stabilization at 5 both ends of power tube is V1, theoretical value 311V；And by the control method of this embodiment,
When power tube 5 is connected, the voltage V2 between the collector and emitter of power tube 5 is 100V-200V, preferably 140V-160V,
Specific such as 145V, 150V, 155V.As it can be seen that both end voltage when power tube 5 is opened is lower, so that power tube 5 is open-minded
Current reduction has the service life technical effect for reducing noise and promoting IGBT.
Preferably, the preset value be the electromagnetic heater rated power half, the preset value it
It is upper to use high-power computer heating control, it is controlled under the preset value using low-power heating.If electromagnetic heater is specified function
Rate is the electromagnetic oven of 2200W, then preset value is set as 1100W.The control method further includes inspection pot step, the inspection pot step
It is carried out under current waveform in full-wave rectifier.Control process includes inspection pot step, to ensure the presence of cookware；Pot step is examined in full-wave rectification
Carried out under waveform, inspection pot efficiency and accuracy can be improved, avoid under half wave rectification wave without the wave stage because examining not cookware
And it generates inspection pot overlong time or makes the erroneous judgement that cookware is not present.
It can be electromagnetic oven, electromagnetic heating rice cooker, electromagnetic heating pressure using above-mentioned Poewr control method electromagnetic heater
Power pot, electromagnetic heating cooking machine, electromagnetic heating soybean milk making machine, electromagnetic heating cooking machine, electromagnetic heating juice extractor etc..
As can be seen from the above description, the Poewr control method of electromagnetic heater provided by the invention passes through switching circuit,
The waveform that rectification circuit is exported is current waveform in full-wave rectifier or half wave rectification wave, and in the low-power heating stage by function
Rate pipe opens control in half wave rectification wave without waveform output time, and both end voltage is 0V when realizing that power tube is opened；
The control of opening of power tube is at least either lived through one without waveform in half wave rectification wave in the low-power heating stage
At the time of after half wave cycles, both end voltage when power tube is opened is lower, so that power tube opens current reduction, tool
There is the service life technical effect for reducing noise and promoting IGBT.
Structure shown in specific embodiment description and attached drawing is preferred structure.In the description of the present invention, it is to be understood that
It is term " center ", " transverse direction ", " thickness ", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outside", " diameter
To ", the orientation or positional relationship of the instructions such as " circumferential direction " be to be based on the orientation or positional relationship shown in the drawings, be merely for convenience of retouching
It states the present invention and simplifies description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific
Orientation construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be direct phase
Even, can also indirectly connected through an intermediary, the interaction that can be connection or two elements inside two elements is closed
System.For the ordinary skill in the art, above-mentioned term in the present invention specific can be understood as the case may be
Meaning.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of Poewr control method of electromagnetic heater, the electromagnetic heater includes controller, switching circuit, rectification
Circuit, resonance circuit and power tube, the rectification circuit is to AC rectification, the switching circuit and the rectified current
Road is connected, and is switched with controlling the rectification circuit between output current waveform in full-wave rectifier and half wave rectification wave, which is characterized in that
The control method includes: to judge whether target heating power is greater than preset value, when target heating power is greater than preset value, is adjusted
Section switching circuit with control rectification circuit output current waveform in full-wave rectifier, controller issue control signal driving power pipe be connected so that
Resonance circuit work；When target heating power is less than preset value, adjustment switching circuit is whole to control rectification circuit output half-wave
Waveform being flowed, and at the subsequent t1 moment, controller issues the conducting of control signal driving power pipe so that resonance circuit works,
Described in the t1 moment be the half wave rectification wave without waveform output at the time of, or at least pass through for the half wave rectification wave
At the time of going through after the half wave cycles without waveform.
2. a kind of Poewr control method of electromagnetic heater as described in claim 1, which is characterized in that the t1 moment is
At the time of output without waveform of the half wave rectification wave, and the t1 is less than 10ms.
3. a kind of Poewr control method of electromagnetic heater as claimed in claim 2, which is characterized in that the controller hair
Out when the conducting of control signal driving power pipe, the voltage between the collector and emitter of the power tube is zero.
4. a kind of Poewr control method of electromagnetic heater as described in claim 1, which is characterized in that the t1 moment is
At the time of the half wave rectification wave at least lives through after the half wave cycles without waveform, and the controller issues control
When signal driving power pipe is connected, the voltage between the collector and emitter of the power tube is 100V-200V.
5. a kind of Poewr control method of electromagnetic heater as described in claim 1, which is characterized in that the t1 moment is
At the time of the half wave rectification wave at least lives through after the half wave cycles without waveform, and the controller issues control
When signal driving power pipe is connected, the voltage between the collector and emitter of the power tube is 140V-160V.
6. a kind of Poewr control method of electromagnetic heater as described in claim 1, which is characterized in that the preset value is
The half of the rated power of the electromagnetic heater.
7. a kind of Poewr control method of electromagnetic heater as described in claim 1, which is characterized in that the switching circuit
It is managed including relay or MOSFET.
8. a kind of Poewr control method of electromagnetic heater as described in claim 1, which is characterized in that the electromagnetic heating
Device includes voltage detecting circuit, and the input terminal of the voltage detecting circuit is connected to the alternating current before the rectification circuit,
The output end of the voltage detecting circuit is connected to the controller.
9. a kind of Poewr control method of electromagnetic heater as described in claim 1, which is characterized in that the rectification circuit
Including four diodes.
10. a kind of Poewr control method of electromagnetic heater as described in claim 1, which is characterized in that further include inspection pot
Step, the inspection pot step carry out under current waveform in full-wave rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910186500.1A CN109905932A (en) | 2019-03-12 | 2019-03-12 | A kind of Poewr control method of electromagnetic heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910186500.1A CN109905932A (en) | 2019-03-12 | 2019-03-12 | A kind of Poewr control method of electromagnetic heater |
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| CN109905932A true CN109905932A (en) | 2019-06-18 |
Family
ID=66946981
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| CN201910186500.1A Pending CN109905932A (en) | 2019-03-12 | 2019-03-12 | A kind of Poewr control method of electromagnetic heater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112512150A (en) * | 2020-11-23 | 2021-03-16 | 广东瑞德智能科技股份有限公司 | Control method for electromagnetic induction heating power control device |
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Application publication date: 20190618 |