CN106287863B - Electromagnetic heater and its control method and control circuit - Google Patents
Electromagnetic heater and its control method and control circuit Download PDFInfo
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- CN106287863B CN106287863B CN201510317715.4A CN201510317715A CN106287863B CN 106287863 B CN106287863 B CN 106287863B CN 201510317715 A CN201510317715 A CN 201510317715A CN 106287863 B CN106287863 B CN 106287863B
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Abstract
The invention discloses a kind of control methods of electromagnetic heater, wherein, the electromagnetic heater includes resonance heating unit, and the resonance heating unit includes the switching switch of coil panel, multiple resonant capacitances and the multiple resonant capacitance switching of control, and the control method includes the following steps：S1 detects the voltage at resonance heating unit both ends, and generates pulse signal according to the voltage at resonance heating unit both ends；S2 obtains the current resonant frequency of the resonance heating unit according to the pulse signal；And S3, judge whether the switching switch fails according to the current resonant frequency of the resonance heating unit.The control method can be effectively protected power switch such as IGBT, ensure that electromagnetic heater is safely and reliably run.The invention also discloses a kind of control circuits of electromagnetic heater and a kind of electromagnetic heater with the control circuit.
Description
Technical field
The present invention relates to living electric apparatus technical field, more particularly to a kind of control method of electromagnetic heater, Yi Zhong electricity
The control circuit of magnetic heating device and a kind of electromagnetic heater with the control circuit.
Background technology
In the related technology, single tube electromagnetic oven resonance circuit generally use parallel resonance mode, when continuous low power is run,
Resonant frequency generally is improved by way of switching resonant capacitance, to reduce IGBT (Insulated Gate when low-power
Bipolar Transistor, insulated gate bipolar transistor) advanced conducting voltage realizes heating, it is therefore desirable to increase switching
Switching participates in the capacitance of resonance to realize the variation of resonant capacitance value, in high power using the resonant capacitance work of large capacity
Make, is worked using the resonant capacitance of low capacity in low-power.
But if run using the resonant capacitance of large capacity in small-power, the advanced conducting voltages of IGBT can improve
Very much, it causes IGBT fevers serious, or even burns IGBT；And it is run using the resonant capacitance of low capacity when high-power, then work
The C pole tensions of IGBT in work are excessively high, easily cause IGBT and burnt because of high pressure.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, first purpose of the present invention is to propose a kind of control method of electromagnetic heater, cut by judging
Change whether switch fails to realize the protection to power switch.
Second object of the present invention is to propose a kind of control method of electromagnetic heater.The third mesh of the present invention
Be propose a kind of electromagnetic heater.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of control method of electromagnetic heater,
Wherein, the electromagnetic heater includes resonance heating unit, and the resonance heating unit includes coil panel, multiple resonant capacitances
With the switching switch for controlling the multiple resonant capacitance switching, the control method includes the following steps：S1 detects the resonance
The voltage at heating unit both ends, and pulse signal is generated according to the voltage at resonance heating unit both ends；S2, according to the arteries and veins
Rush the current resonant frequency of resonance heating unit described in signal acquisition；And S3, according to the current humorous of the resonance heating unit
Vibration frequency judges whether the switching switch fails.
The control method of electromagnetic heater according to the ... of the embodiment of the present invention detects the electricity at resonance heating unit both ends first
Then pressure generates pulse signal according to the voltage at resonance heating unit both ends, it is single to obtain resonance heating then according to pulse signal
The current resonant frequency of member finally judges whether switching switch fails according to the current resonant frequency of resonance heating unit, to
Can be by judging whether the size of the current resonant frequency of resonance heating unit fails to judge that switching switchs, and then can avoid electricity
Magnetic heating device uses the resonant capacitance of large capacity to run in low-power heating because switching switch failure, prevents power switch
Such as the advanced conducting voltages of IGBT can improve a lot and IGBT fevers is caused seriously to cause to burn IGBT, and can avoid electromagnetic heating
Device uses the resonant capacitance of low capacity to run in high-power heating because switching switch failure, prevents the IGBT's in work
C pole tensions are excessively high and IGBT is caused to be burnt because of high pressure, therefore, can be effectively protected power switch such as IGBT, ensure electromagnetism
Heating device is safely and reliably run.
According to one embodiment of present invention, the step S3 is specifically included：When the electromagnetic heater is operated in height
When power heated condition, if the current resonant frequency of the resonance heating unit be more than the first predeterminated frequency, judge described in
Switching switch is in open failure state, wherein first predeterminated frequency is operated in Gao Gong higher than the electromagnetic heater
The resonant frequency of resonance heating unit when rate heated condition；When the electromagnetic heater is operated in low-power heated condition
When, if the current resonant frequency of the resonance heating unit is less than the second predeterminated frequency, judge that the switching switch is in
Short-circuit failure state, wherein when second predeterminated frequency is operated in low-power heated condition less than the electromagnetic heater
The resonant frequency of the resonance heating unit.
According to one embodiment of present invention, when judging the switching switch failure, alarm is also sent out, and control
The electromagnetic heater stops heating or switching heating power.
According to one embodiment of present invention, the step S3 is specifically included：S406, if need to judge that switching is opened
Road, if so, step S407 is executed, if not, executing step S410；S407, by current resonant frequency value and the first default frequency
Rate is compared；S408, judges whether current resonant frequency value is more than the first predeterminated frequency, if so, executing step S409, such as
Fruit is no, executes step S414；S409, judgement switching switch open, and send out open circuit alarm；S410, if need to judge switching
Switch short, if so, executing step S411；If not, executing step S414；S411, by current resonant frequency value and second
Predeterminated frequency is compared；S412, judges whether current resonant frequency value is less than the second predeterminated frequency, if so, executing step
S413；If not, executing step S414；S413, judgement switching switch short, and send out short-circuit alarming；S414, control electromagnetism add
Thermal normal heating.
According to one embodiment of present invention, the multiple resonant capacitance includes the first resonant capacitance and the second resonance electricity
Hold, in parallel with the coil panel after first resonant capacitance and the series connection of the second resonant capacitance, the switching switchs and described the
A parallel connection in one resonant capacitance and the second resonant capacitance.
According to another embodiment of the invention, the multiple resonant capacitance includes the first resonant capacitance and the second resonance electricity
Hold, in parallel with the coil panel after first resonant capacitance and the second resonant capacitance parallel connection, the switching switchs and described the
A series connection in one resonant capacitance and the second resonant capacitance.
In order to achieve the above objectives, a kind of control circuit for electromagnetic heater that second aspect of the present invention embodiment proposes,
Including：Resonance heating unit, the resonance heating unit include coil panel, multiple resonant capacitances and the multiple resonance electricity of control
Hold the switching switch of switching；Power switch；Pulse signal generates unit, and it is described humorous for detecting that the pulse signal generates unit
Shake the voltage at heating unit both ends, and generates pulse signal according to the voltage at resonance heating unit both ends；And master control list
Member, current resonant frequency of the main control unit for obtaining the resonance heating unit according to the pulse signal, and according to
The current resonant frequency of the resonance heating unit judges whether the switching switch fails.
The control circuit of electromagnetic heater according to the ... of the embodiment of the present invention generates unit by pulse signal and detects resonance
The voltage at heating unit both ends, and according to the voltage at resonance heating unit both ends generate pulse signal, then main control unit according to
Pulse signal obtains the current resonant frequency of resonance heating unit, and is cut according to the judgement of the current resonant frequency of resonance heating unit
It changes whether switch fails, is to judge switching switch so as to the size of the current resonant frequency by judging resonance heating unit
No failure, and then can avoid the resonance electricity that electromagnetic heater uses large capacity in low-power heating because switching switch failure
Hold operation, prevents the advanced conducting voltages of power switch such as IGBT from can improve a lot and IGBT fevers is caused seriously to cause to burn
IGBT, and can avoid electromagnetic heater and use the resonant capacitance of low capacity to transport because switching switch failure in high-power heating
Row, prevents the C pole tensions of the IGBT in work excessively high and IGBT is caused to be burnt because of high pressure, therefore, can be effectively protected power
Such as IGBT is switched, ensures that electromagnetic heater is safely and reliably run.
According to one embodiment of present invention, when the electromagnetic heater is operated in high power heated condition, if
The current resonant frequency of the resonance heating unit is more than the first predeterminated frequency, and the main control unit then judges the switching switch
In open failure state, wherein first predeterminated frequency is operated in high power higher than the electromagnetic heater and heats shape
The resonant frequency of resonance heating unit when state；When the electromagnetic heater is operated in low-power heated condition, if
The current resonant frequency of the resonance heating unit is less than the second predeterminated frequency, and the main control unit then judges the switching switch
In short-circuit failure state, wherein second predeterminated frequency is operated in low-power less than the electromagnetic heater and heats shape
The resonant frequency of resonance heating unit when state.
According to one embodiment of present invention, when judging the switching switch failure, the main control unit also sends out report
Alert prompt, and control the electromagnetic heater and stop heating or switching heating power.According to one embodiment of present invention, institute
It states multiple resonant capacitances and includes the first resonant capacitance and the second resonant capacitance, first resonant capacitance and the second resonant capacitance string
In parallel with the coil panel after connection, one in the switching switch and first resonant capacitance and the second resonant capacitance is simultaneously
Connection.
According to another embodiment of the invention, the multiple resonant capacitance includes the first resonant capacitance and the second resonance electricity
Hold, in parallel with the coil panel after first resonant capacitance and the second resonant capacitance parallel connection, the switching switchs and described the
A series connection in one resonant capacitance and the second resonant capacitance.
In addition, the embodiment of the present invention also proposed a kind of electromagnetic heater comprising above-mentioned control circuit.
The electromagnetic heater of the embodiment of the present invention can by judge resonance heating unit current resonant frequency it is big
It is small whether to fail to judge that switching switchs, to can avoid using large capacity because switching switch failure in low-power heating
Resonant capacitance is run, and prevents the advanced conducting voltages of power switch such as IGBT from can improve a lot and IGBT fevers is caused seriously to cause
IGBT is burnt, and can avoid using the resonant capacitance of low capacity to run because switching switch failure in high-power heating, is prevented
The C pole tensions of IGBT in work are excessively high and IGBT is caused to be burnt because of high pressure, therefore, can be effectively protected power switch for example
IGBT, realization are safely and reliably run.
Description of the drawings
Fig. 1 is the schematic diagram according to the control circuit of the electromagnetic heater of one embodiment of the invention；
Fig. 2 is the schematic diagram according to the control circuit of the electromagnetic heater of another embodiment of the present invention；
Fig. 3 is the flow chart according to the control method of the electromagnetic heater of the embodiment of the present invention；And
Fig. 4 is the flow chart according to the control method of the electromagnetic heater of a specific embodiment of the invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawings come the control method of the electromagnetic heater proposed according to embodiments of the present invention is described, electromagnetism adds
The control circuit of thermal and electromagnetic heater with the control circuit.
As shown in Figure 1 or 2, the control circuit of the electromagnetic heater of the embodiment of the present invention includes rectification filtering unit
10, resonance heating unit 20, pulse signal generate unit 30, power switch such as IGBT, IGBT driving unit 40, switch control
Unit 50 and main control unit 60 etc..Also, electromagnetic heater can be electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker etc.
Household electrical appliance.
Further, rectification filtering unit 10 include to input AC electricity carry out rectification processing rectifier bridge stack 101 and
The filter circuit 102 being made of filter inductance L0 and filter capacitor C0, resonance heating unit 20 include coil panel L1, multiple resonance
Capacitance such as the first resonant capacitance C1 and the second resonant capacitance C2 and the switching switch S1 of the multiple resonant capacitance switchings of control,
It includes first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 and comparator that pulse signal, which generates unit 30,
U1。
In an embodiment of the present invention, the resonant frequency of resonance heating unit and resonant inductance (i.e. coil panel) and resonance electricity
Hold correlation, in the case where resonant inductance (coil panel) is constant, resonant capacitance is smaller, and resonant frequency is bigger, and resonant capacitance is bigger,
Resonant frequency is smaller.
Wherein, as shown in Figure 1, when electromagnetic heater is with high power operation, main control unit 60 sends out switch S1 and is closed
Signal is closed switching switch S1 to switch control unit 50, at this time the first resonant capacitance C1 and the second resonant capacitance C2 parallel connections ginseng
With resonance, capacitance that resonant capacitance value is C1 and C2 and, the capacitance of C1 and C2 and more than C1 capacitances；When electromagnetic heater is with low
When Power operation, main control unit 60 sends out switch S1 cut-off signals to switch control unit 50, disconnects switching switch S1, at this time only
There is the first resonant capacitance C1 to participate in resonance, the second resonant capacitance C2 does not work.
Alternatively, as shown in Fig. 2, when electromagnetic heater is with low power run, main control unit 60 sends out switch S1 and disconnects
Signal disconnects switching switch S1 to switch control unit 50, at this time the first resonant capacitance C1 and the second resonant capacitance C2 series connection ginsengs
With resonance, resonant capacitance value is C1*C2/C1+C2, and C1*C2/C1+C2 is less than the capacitance of C1 or C2；When electromagnetic heater is with height
When Power operation, main control unit 60 sends out switch S1 closure signals to switch control unit 50, is closed switching switch S1, at this time only
There is the first resonant capacitance C1 to participate in resonance, the second resonant capacitance C2 is short-circuited, does not work.
Therefore it says, in an embodiment of the present invention, when electromagnetic heater is operated in high power heated condition, participates in resonance
Resonant capacitance value it is larger, the resonant frequency of resonance heating unit is smaller；Electromagnetic heater is operated in low-power heated condition
When, the resonant capacitance value for participating in resonance is smaller, and the resonant frequency of resonance heating unit is larger.
As shown in figure 3, the control method of above-mentioned electromagnetic heater includes the following steps：
S1, the voltage at detection resonance heating unit both ends, and pulse letter is generated according to the voltage at resonance heating unit both ends
Number.
In an embodiment of the present invention, unit can be generated by pulse signal to detect the electricity at resonance heating unit both ends
Then pressure generates pulse signal according to the voltage at resonance heating unit both ends, and pulse signal is sent to main control unit.
S2 obtains the current resonant frequency of resonance heating unit according to pulse signal.
S3 judges whether switching switch fails according to the current resonant frequency of resonance heating unit.
According to one embodiment of present invention, step S3 is specifically included：When electromagnetic heater is operated in high power heating
When state, if the current resonant frequency F of resonance heating unit is more than the first predeterminated frequency M, judges that switching switch is in and open
Road failure state, wherein the first predeterminated frequency M when being operated in high power heated condition higher than electromagnetic heater the resonance add
The resonant frequency of hot cell；When electromagnetic heater is operated in low-power heated condition, if the resonance heating unit
Current resonant frequency F is less than the second predeterminated frequency N, then judges that switching switch is in short-circuit failure state, wherein the second default frequency
Rate N is operated in the resonant frequency of resonance heating unit when low-power heated condition less than the electromagnetic heater.
Wherein, the first predeterminated frequency M and the second predeterminated frequency N can be pre-stored in main control unit.
That is, when electromagnetic heater carries out resonance heating work, pulse signal generates unit and generates pulse letter
Number, pulse signal is converted to the current resonant frequency value F of resonance heating unit by main control unit, while main control unit sets Gao Gong
The second predeterminated frequency N when the first predeterminated frequency M and low-power when rate.Main control unit is needing to judge whether switching switch loses
Under conditions of effect, when electromagnetic heater carries out heating work with high power, if F>M then judges switch S1 open circuits；In electricity
If magnetic heating device is with F when low-power progress heating work<N then judges switch S1 short circuits.
Also, when judging to switch switch failure, alarm is also sent out, while making corresponding treatment measures, such as
It controls electromagnetic heater and stops heating or switching heating power.
According to one embodiment of present invention, as shown in Figure 1, multiple resonant capacitances include the first resonant capacitance C1 and second
It is in parallel with coil panel L1 after resonant capacitance C2, the first resonant capacitance C1 and the second resonant capacitance C2 parallel connections, switch switch S1 and the
A such as second resonant capacitance C2 series connection in one resonant capacitance and the second resonant capacitance.
According to another embodiment of the invention, as shown in Fig. 2, multiple resonant capacitances include the first resonant capacitance C1 and the
It is in parallel with coil panel L1 after two resonant capacitance C2, the first resonant capacitance C1 and the second resonant capacitance C2 series connection, switch switch S1 and
A parallel connection in first resonant capacitance C1 and the second resonant capacitance C2 is for example in parallel with the second resonant capacitance C2.
Specifically, according to one embodiment of present invention, as shown in figure 4, the control method of above-mentioned electromagnetic heater
Include the following steps：
S401, the power (high power or low-power) that main control unit is currently needed according to electromagnetic heater send out control letter
Number switch control unit is given, control switching switch S1 is closed or disconnection, is simultaneously emitted by PPG or pwm signal and gives IGBT driving units.
S402, IGBT driving unit driving power switch such as IGBT, and such resonance heating unit is proceeded by with IGBT
Resonance heating work.
S403, pulse signal generate unit output pulse signal.
Pulse signal is converted into resonant frequency value F by S404, main control unit.
S405, if need to judge the S1 failures of switching switch.If so, executing step S406；If not, executing step
S414。
S406, if need to judge switching switch S1 open circuits.If so, executing step S407；If not, executing step
S410。
Current resonant frequency value F is compared by S407 with the first predeterminated frequency M.
S408, judges whether current resonant frequency value F is more than the first predeterminated frequency M.If so, executing step S409；Such as
Fruit is no, executes step S414.
S409, switching switch S1 open circuits, and send out S1 open circuit alarms.
S410, if need to judge the S1 short circuits of switching switch.If so, executing step S411；If not, executing step
S414。
Current resonant frequency value F is compared by S411 with the second predeterminated frequency N.
S412, judges whether current resonant frequency value F is less than the second predeterminated frequency N.If so, executing step S413；Such as
Fruit is no, executes step S414.
S413, the S1 short circuits of switching switch, and send out S1 short-circuit alarmings.
S414 controls electromagnetic heater normal heating.
In the example of the present invention, when the heating power of electromagnetic heater is less than or equal to 1000W, main control unit
It is defaulted as low-power heated condition, is otherwise high power heated condition, while when main control unit setting high power heated condition
First predeterminated frequency M and the second predeterminated frequency N when low-power heated condition.When user's operation electromagnetic heater runs certain greatly
When power (such as 2000W) heats, main control unit sends out S1 closure signals to switch control unit, and switch control unit control is cut
It changes switch S1 to be closed, resonance heating unit can run (as shown in Figure 1) with resonant capacitance C1, C2 parallel way, and main control unit will
Pulse signal is converted into current resonant frequency value F, while comparing the size of F and M, if F>M then judges that switching switch S1 opens
Road；When user's operation electromagnetic heater runs the heating of certain small-power (such as 500W), main control unit sends out S1 cut-off signals
To switch control unit, switch control unit control switching switch S1 is disconnected, and resonance heating unit can be with resonant capacitance C1 and L1
Parallel resonance mode is run (as shown in Figure 1), and main control unit converts pulse signal to current resonant frequency value F, while comparing F
Judge to switch switch S1 short circuits if F ＜ N with the size of N.
Also, after switching switch S1 failures (short circuit or open circuit), main control unit sends out corresponding warning message and makes phase
It should act (such as shutdown or switching heating power).
The control method of electromagnetic heater according to the ... of the embodiment of the present invention detects the electricity at resonance heating unit both ends first
Then pressure generates pulse signal according to the voltage at resonance heating unit both ends, it is single to obtain resonance heating then according to pulse signal
The current resonant frequency of member finally judges whether switching switch fails according to the current resonant frequency of resonance heating unit, to
Can be by judging whether the size of the current resonant frequency of resonance heating unit fails to judge that switching switchs, and then can avoid electricity
Magnetic heating device uses the resonant capacitance of large capacity to run in low-power heating because switching switch failure, prevents power switch
Such as the advanced conducting voltages of IGBT can improve a lot and IGBT fevers is caused seriously to cause to burn IGBT, and can avoid electromagnetic heating
Device uses the resonant capacitance of low capacity to run in high-power heating because switching switch failure, prevents the IGBT's in work
C pole tensions are excessively high and IGBT is caused to be burnt because of high pressure, therefore, can be effectively protected power switch such as IGBT, ensure electromagnetism
Heating device is safely and reliably run.
As shown in Figure 1 or 2, the control circuit of the electromagnetic heater of the embodiment of the present invention includes：Resonance heating unit
20, power switch such as IGBT, pulse signal generates unit 30 and main control unit 60.
Wherein, resonance heating unit 20 includes coil panel L1, multiple resonant capacitances and the multiple resonant capacitance switchings of control
Switch switch S1.
According to one embodiment of present invention, as shown in Figure 1, multiple resonant capacitances include the first resonant capacitance C1 and second
It is in parallel with coil panel L1 after resonant capacitance C2, the first resonant capacitance C1 and the second resonant capacitance C2 parallel connections, switch switch S1 and the
A such as second resonant capacitance C2 series connection in one resonant capacitance and the second resonant capacitance.
According to another embodiment of the invention, as shown in Fig. 2, multiple resonant capacitances include the first resonant capacitance C1 and the
It is in parallel with coil panel L1 after two resonant capacitance C2, the first resonant capacitance C1 and the second resonant capacitance C2 series connection, switch switch S1 and
A parallel connection in first resonant capacitance C1 and the second resonant capacitance C2 is for example in parallel with the second resonant capacitance C2.
As shown in Figure 1 or 2, pulse signal generates the voltage that unit 30 is used to detect 20 both ends of resonance heating unit, and
Pulse signal is generated according to the voltage at 20 both ends of resonance heating unit, main control unit 60 is used to obtain according to the pulse signal humorous
It shakes the current resonant frequency of heating unit 20, and judges that switching switch S1 is according to the current resonant frequency of resonance heating unit 20
No failure.Wherein, it includes first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 that pulse signal, which generates unit 30,
And comparator U1.
According to one embodiment of present invention, when electromagnetic heater is operated in high power heated condition, if resonance
The current resonant frequency F of heating unit is more than the first predeterminated frequency M, and main control unit 60 then judges that switching switch S1 is in open circuit mistake
Effect state, wherein the resonance heating is single when the first predeterminated frequency M is operated in high power heated condition higher than electromagnetic heater
The resonant frequency of member；When electromagnetic heater is operated in low-power heated condition, if the resonance heating unit is current
Resonant frequency F is less than the second predeterminated frequency N, and main control unit 60 then judges that switching switch S1 is in short-circuit failure state, wherein the
Two predeterminated frequency N are operated in the resonance frequency of resonance heating unit when low-power heated condition less than the electromagnetic heater
Rate.
Also, when judging the S1 failures of switching switch, main control unit 60 also sends out alarm, while making corresponding place
Reason measure, and control electromagnetic heater and stop heating or switching heating power.
The control circuit of electromagnetic heater according to the ... of the embodiment of the present invention generates unit by pulse signal and detects resonance
The voltage at heating unit both ends, and according to the voltage at resonance heating unit both ends generate pulse signal, then main control unit according to
Pulse signal obtains the current resonant frequency of resonance heating unit, and is cut according to the judgement of the current resonant frequency of resonance heating unit
It changes whether switch fails, is to judge switching switch so as to the size of the current resonant frequency by judging resonance heating unit
No failure, and then can avoid the resonance electricity that electromagnetic heater uses large capacity in low-power heating because switching switch failure
Hold operation, prevents the advanced conducting voltages of power switch such as IGBT from can improve a lot and IGBT fevers is caused seriously to cause to burn
IGBT, and can avoid electromagnetic heater and use the resonant capacitance of low capacity to transport because switching switch failure in high-power heating
Row, prevents the C pole tensions of the IGBT in work excessively high and IGBT is caused to be burnt because of high pressure, therefore, can be effectively protected power
Such as IGBT is switched, ensures that electromagnetic heater is safely and reliably run.
In addition, the embodiment of the present invention also proposed a kind of electromagnetic heater comprising above-mentioned control circuit.
The electromagnetic heater of the embodiment of the present invention can by judge resonance heating unit current resonant frequency it is big
It is small whether to fail to judge that switching switchs, to can avoid using large capacity because switching switch failure in low-power heating
Resonant capacitance is run, and prevents the advanced conducting voltages of power switch such as IGBT from can improve a lot and IGBT fevers is caused seriously to cause
IGBT is burnt, and can avoid using the resonant capacitance of low capacity to run because switching switch failure in high-power heating, is prevented
The C pole tensions of IGBT in work are excessively high and IGBT is caused to be burnt because of high pressure, therefore, can be effectively protected power switch for example
IGBT, realization are safely and reliably run.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply 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 at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., 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；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct 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
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of control method of electromagnetic heater, which is characterized in that the electromagnetic heater includes resonance heating unit,
The resonance heating unit includes the switching switch of coil panel, multiple resonant capacitances and the multiple resonant capacitance switching of control,
The control method includes the following steps：
S1 detects the voltage at resonance heating unit both ends, and generates arteries and veins according to the voltage at resonance heating unit both ends
Rush signal；
S2 obtains the current resonant frequency of the resonance heating unit according to the pulse signal；And
S3 judges whether the switching switch fails, wherein specific packet according to the current resonant frequency of the resonance heating unit
It includes：
When the electromagnetic heater is operated in high power heated condition, if the current resonance frequency of the resonance heating unit
Rate is more than the first predeterminated frequency, then judges that the switching switch is in open failure state, wherein first predeterminated frequency is high
The resonant frequency of the resonance heating unit when electromagnetic heater is operated in high power heated condition；
When the electromagnetic heater is operated in low-power heated condition, if the current resonance frequency of the resonance heating unit
Rate is less than the second predeterminated frequency, then judges that the switching switch is in short-circuit failure state, wherein second predeterminated frequency is low
The resonant frequency of the resonance heating unit when electromagnetic heater is operated in low-power heated condition.
2. the control method of electromagnetic heater as described in claim 1, which is characterized in that lost when judging that the switching switchs
When effect, alarm is also sent out, and controls the electromagnetic heater and stops heating or switching heating power.
3. the control method of electromagnetic heater as described in claim 1, which is characterized in that the step S3 is specifically included：
S406, if need to judge switching switch open, if so, step S407 is executed, if not, executing step S410；
Current resonant frequency value is compared by S407 with the first predeterminated frequency；
S408, judges whether current resonant frequency value is more than the first predeterminated frequency, if so, step S409 is executed, if not, holding
Row step S414；
S409, judgement switching switch open, and send out open circuit alarm；
S410, if need to judge switching switch short, if so, executing step S411；If not, executing step S414；
Current resonant frequency value is compared by S411 with the second predeterminated frequency；
S412, judges whether current resonant frequency value is less than the second predeterminated frequency, if so, executing step S413；If not, holding
Row step S414；
S413, judgement switching switch short, and send out short-circuit alarming；
S414 controls electromagnetic heater normal heating.
4. the control method of electromagnetic heater as described in claim 1, which is characterized in that the multiple resonant capacitance includes
After first resonant capacitance and the second resonant capacitance, first resonant capacitance and the series connection of the second resonant capacitance simultaneously with the coil panel
Connection, the switching switch are in parallel with one in first resonant capacitance and the second resonant capacitance.
5. the control method of electromagnetic heater as described in claim 1, which is characterized in that the multiple resonant capacitance includes
After first resonant capacitance and the second resonant capacitance, first resonant capacitance and the second resonant capacitance parallel connection simultaneously with the coil panel
Connection, the switching switch are connected with one in first resonant capacitance and the second resonant capacitance.
6. a kind of control circuit of electromagnetic heater, which is characterized in that including：
Resonance heating unit, the resonance heating unit include coil panel, multiple resonant capacitances and the multiple resonance electricity of control
Hold the switching switch of switching；
Power switch；
Pulse signal generates unit, and the pulse signal generates the voltage that unit is used to detect resonance heating unit both ends,
And pulse signal is generated according to the voltage at resonance heating unit both ends；And
Main control unit, the main control unit are used to obtain the current resonance frequency of the resonance heating unit according to the pulse signal
Rate, and judge whether the switching switch fails according to the current resonant frequency of the resonance heating unit, wherein
When the electromagnetic heater is operated in high power heated condition, if the current resonance frequency of the resonance heating unit
Rate is more than the first predeterminated frequency, and the main control unit then judges switching switch in open failure state, wherein described the
One predeterminated frequency is operated in the resonance frequency of resonance heating unit when high power heated condition higher than the electromagnetic heater
Rate；
When the electromagnetic heater is operated in low-power heated condition, if the current resonance frequency of the resonance heating unit
Rate is less than the second predeterminated frequency, and the main control unit then judges switching switch in short-circuit failure state, wherein described the
Two predeterminated frequencies are operated in the resonance frequency of resonance heating unit when low-power heated condition less than the electromagnetic heater
Rate.
7. the control circuit of electromagnetic heater as claimed in claim 6, which is characterized in that lost when judging that the switching switchs
When effect, the main control unit also sends out alarm, and controls the electromagnetic heater and stop heating or switching heating power.
8. the control circuit of electromagnetic heater as claimed in claim 6, which is characterized in that the multiple resonant capacitance includes
After first resonant capacitance and the second resonant capacitance, first resonant capacitance and the series connection of the second resonant capacitance simultaneously with the coil panel
Connection, the switching switch are in parallel with one in first resonant capacitance and the second resonant capacitance.
9. the control circuit of electromagnetic heater as claimed in claim 6, which is characterized in that the multiple resonant capacitance includes
After first resonant capacitance and the second resonant capacitance, first resonant capacitance and the second resonant capacitance parallel connection simultaneously with the coil panel
Connection, the switching switch are connected with one in first resonant capacitance and the second resonant capacitance.
10. a kind of electromagnetic heater, which is characterized in that include the control circuit as described in any one of claim 6-9.
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| CN201510317715.4A CN106287863B (en) | 2015-06-10 | 2015-06-10 | Electromagnetic heater and its control method and control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109104781B (en) * | 2017-06-20 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooker and heating control device and method thereof |
| CN110582135B (en) * | 2018-06-08 | 2022-03-22 | 佛山市顺德区美的电热电器制造有限公司 | Method and device for judging type of cookware and electric cooking appliance |
| CN109640424A (en) * | 2018-12-18 | 2019-04-16 | 珠海格力电器股份有限公司 | Electromagnetic heating system abnormity detection method and device and readable storage medium |
| CN113939052B (en) * | 2020-07-14 | 2024-04-19 | 佛山市顺德区美的电热电器制造有限公司 | Ironing device, heating control system, heating control method and storage medium thereof |
| CN114062779B (en) * | 2020-07-31 | 2023-06-27 | 浙江绍兴苏泊尔生活电器有限公司 | Heating frequency detection method, device, equipment and storage medium |
| CN114062908B (en) * | 2020-08-06 | 2023-07-04 | 浙江绍兴苏泊尔生活电器有限公司 | Relay state detection method, device and equipment of electromagnetic heating appliance |
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