CN110049589A - Determination method, electromagnetic heating circuit and the electromagnetic heating utensil of valley calibration - Google Patents
Determination method, electromagnetic heating circuit and the electromagnetic heating utensil of valley calibration Download PDFInfo
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- CN110049589A CN110049589A CN201811613605.2A CN201811613605A CN110049589A CN 110049589 A CN110049589 A CN 110049589A CN 201811613605 A CN201811613605 A CN 201811613605A CN 110049589 A CN110049589 A CN 110049589A
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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
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Abstract
The present invention provides determination method, electromagnetic heating circuit (100) and the electromagnetic heating utensil (10) of a kind of valley calibration.This method comprises: determining includes N number of probe signal for souning out pulse, each sending moment for souning out pulse is the sum of ac supply signal corresponding valley moment and calibration duration, and the corresponding valley moment at sending moment of any two exploration pulse and calibration duration are all different；The probe signal is input in driving circuit (103), so that driving circuit (103) generates the driving signal including N number of driving pulse of same size of driving IGBT (102) conducting, the initial time of N number of driving pulse is respectively N number of sending moment for souning out pulse；According to the minimum current in N number of conducting electric current of IGBT (102), determine the sending moment for souning out pulse corresponding with minimum current, to according to the sending moment corresponding calibration duration determined, the ac supply signal the surveyed corresponding valley moment is calibrated, ensure that driving circuit (103) driving IGBT (102) is connected when drain voltage is minimum, to reduce cost.
Description
Technical field
The present invention relates to the determination methods of electromagentic furnace technology field more particularly to a kind of calibration of valley, electromagnetic heating circuit
And electromagnetic heating utensil.
Background technique
Electromagnetic heating circuit can use electromagnetic induction principle and convert electrical energy into thermal energy, treats heating equipment and is added
Heat.Electromagnetic heating circuit application field is relatively broad, such as electric cooker, electric pressure cooker, soy bean milk making machine, coffee machine, blender are various
It needs in the utensil of heating function.
However, there are non-resistive elements in the major loop of existing electromagnetic heating circuit, so that the valley of ac supply signal
Moment and insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) drain voltage are minimum
When turn-on instant between there are phase differences, cause IGBT that can not be connected at the valley moment of ac supply signal, be easy to cause
The starting current of IGBT is excessive and leads to the damage of component, improves the component cost of circuit.
Summary of the invention
The present invention provides determination method, electromagnetic heating circuit and the electromagnetic heating utensil of a kind of valley calibration, existing to solve
There are phases between turn-on instant when having in technology due to the valley moment of ac supply signal and minimum IGBT drain voltage
Difference and cause IGBT that can not be connected at the valley moment of ac supply signal, cause the starting current of IGBT excessive and lead to first device
The problem of part damages.
In a first aspect, the present invention provides a kind of determination method of valley calibration, comprising:
Determine that probe signal, the probe signal include N number of exploration pulse, each sending moment for souning out pulse is exchange
The sum of power supply signal corresponding valley moment and calibration duration, any two sound out the corresponding valley moment at sending moment of pulse
All different with calibration duration, N is positive integer；
The probe signal is input in driving circuit, so that the driving circuit generates the driving of driving IGBT conducting
Signal, the driving signal include N number of driving pulse of same size, and the initial time of N number of driving pulse is respectively institute
State N number of sending moment for souning out pulse；
According to the minimum current in N number of conducting electric current of the IGBT, exploration arteries and veins corresponding with the minimum current is determined
The sending moment of punching；
Determine the sending moment corresponding calibration duration, wherein the calibration duration is used for the alternating current surveyed
The source signal corresponding valley moment is calibrated, so that the driving circuit drives the IGBT to lead when drain voltage is minimum
It is logical.
Optionally, the determining probe signal, comprising:
Using any one corresponding valley moment of the ac supply signal as initial time；
It is corresponding to the ac supply signal from the initial time according to the period of the ac supply signal
The valley moment is successively estimated, N number of exploration moment is obtained；
N number of calibration duration according to sequence from small to large is successively added to N number of exploration moment, obtains N number of examination
Visit the sending moment of pulse；
According to N number of sending moment for souning out pulse, the probe signal is determined.
Optionally, according to formula one, N number of sending moment for souning out pulse is obtained:
Tn=(t1+n × Δ T)-[M-n] × Δ t1 formula one；
Wherein, TnThe sending moment of pulse is soundd out for any one, t1 is the initial time, and n is positive integer, and n≤
N, Δ T are the half period of the ac supply signal,Or[M-n] × Δ t1 is calibration duration.
Optionally, corresponding minimum current is being connected according to the IGBT, is determining exploration corresponding with the minimum current
Before the sending moment of pulse, the method also includes:
Within the pulse width corresponding period of N number of driving pulse, the electric current when IGBT is connected is carried out
Detection, obtains N number of conducting electric current；
The minimum current is selected from N number of conducting electric current.
Optionally, described that corresponding minimum current is connected according to the IGBT, determine examination corresponding with the minimum current
Visit the sending moment of pulse, comprising:
Determine the initial time of driving pulse corresponding with the minimum current；
According to the initial time of the driving pulse, the corresponding sending moment for souning out pulse is determined.
Second aspect, the present invention provide a kind of electromagnetic heating circuit, comprising: major loop, insulated gate bipolar transistor
IGBT, driving circuit and micro-control unit MCU；
Wherein, the output end of the MCU is connect with the input terminal of the driving circuit, the output end of the driving circuit with
The input terminal of the IGBT connects, and the output end of the IGBT is connect with the output end of the major loop；
The MCU, for obtaining the ac supply signal corresponding valley moment；
The MCU is also used to determining probe signal, and the probe signal includes N number of exploration pulse, each exploration pulse
Issuing the moment is the sum of the ac supply signal corresponding valley moment and calibration duration, and any two sound out the sending of pulse
Corresponding valley moment at moment and calibration duration are all different, and N is positive integer；
The MCU is also used to for the probe signal being input in the driving circuit, so that the driving circuit generates
The driving signal of IGBT conducting is driven, the driving signal includes N number of driving pulse of same size, N number of driving pulse
Initial time be respectively it is described it is N number of sound out pulse the sending moment；
The MCU is also used within the pulse width corresponding period of N number of driving pulse, obtains the IGBT
N number of conducting electric current；
The MCU is also used to according to the minimum current in N number of conducting electric current, and determination is corresponding with the minimum current
Exploration pulse the sending moment；
The MCU is also used to determine the sending moment corresponding calibration duration, wherein the calibration duration for pair
The ac supply signal the surveyed corresponding valley moment is calibrated, so that the driving circuit drives the IGBT draining
It is connected when voltage is minimum.
Optionally, the electromagnetic heating circuit further include: current sampling circuit；The major loop includes: sequentially connected
Filter circuit, rectification circuit and resonance circuit, the output end of the resonance circuit are connect with the drain electrode of the IGBT；
Wherein, the first input end of the current sampling circuit is connect with the negative sense output end of the rectification circuit, described
Second input terminal of current sampling circuit is connect with the source electrode of the IGBT, the output end of the current sampling circuit with it is described
The first input end of MCU connects；
The current sampling circuit, it is right in the corresponding testing time section of pulse width in N number of driving pulse
The electric current when IGBT is connected is detected, and N number of conducting electric current is obtained；And N number of conducting electric current is sent to institute
State MCU.
Optionally, the current sampling circuit includes: first resistor, second resistance, 3rd resistor and first capacitor；
Wherein, the first end of the first resistor respectively with the negative sense output end of the rectification circuit and the second resistance
First end connection, the second end of the second resistance connect with the source electrode of the IGBT, and the second end of the second resistance is divided
It is not connect with the second end of the first input end of the MCU, the first end of the 3rd resistor and the first capacitor, it is described
The second end of 3rd resistor is connected with the first level, the second end ground connection of the first capacitor.
Optionally, the electromagnetic heating circuit further include: current sampling circuit；The major loop includes: filter circuit, whole
Current circuit and resonance circuit；
Wherein, the output end of the filter circuit is connect with the input terminal of the rectification circuit, and the rectification circuit is born
It is connect to output end with the source electrode of the IGBT, the output end of the resonance circuit is connect with the drain electrode of the IGBT；
The first input end of the current sampling circuit is connect with the positive output end of the rectification circuit, and the electric current is adopted
Second input terminal of sample circuit is connect with the input terminal of the resonance circuit, the output end of the current sampling circuit with it is described
The first input end of MCU connects；
The current sampling circuit, it is right in the corresponding testing time section of pulse width in N number of driving pulse
The electric current when IGBT is connected is detected, and N number of conducting electric current is obtained；And N number of conducting electric current is sent to described
MCU。
Optionally, the current sampling circuit includes: transformer, the 4th resistance, first diode, the 5th resistance, the 6th
Resistance and the second capacitor；
Wherein, the first input end of the transformer is connect with the positive output end of the rectification circuit, the transformer
Second output terminal connect with the input terminal of the resonance circuit, the first output end of the transformer respectively with it is described 4th electricity
The anode connection of the first end of resistance and the first diode, the first of the cathode of the first diode and the 5th resistance
End connection, the second end of the 5th resistance respectively with the first end of the 6th resistance, the first end of second capacitor with
And the first input end connection of the MCU, the second output terminal of the transformer, the second end of the 4th resistance, described the
The second end of six resistance and the second end of the second capacitor ground connection.
Optionally, the MCU is specifically used for using any one corresponding valley moment of the ac supply signal as just
Begin the moment；According to the period of the ac supply signal, from the initial time, paddy corresponding to the ac supply signal
The value moment is successively estimated, N number of exploration moment is obtained；N number of exploration moment is successively added according to sequence from small to large
N number of calibration duration, obtain it is described it is N number of sound out pulse the sending moment；According to N number of sending moment for souning out pulse, really
The fixed probe signal.
Optionally, according to formula one, N number of sending moment for souning out pulse is obtained:
Tn=(t1+n × Δ T)-[M-n] × Δ t1 formula one；
Wherein, TnThe sending moment of pulse is soundd out for any one, t1 is the initial time, and n is positive integer, and n≤
N, Δ T are the half period of the ac supply signal,Or[M-n] × Δ t1 is calibration duration.
Optionally, the MCU, also particularly useful for the initial time for determining driving pulse corresponding with the minimum current；
According to the initial time of the driving pulse, the corresponding sending moment for souning out pulse is determined.
Optionally, the electromagnetic heating circuit further include: AC power circuit and valley value detection circuit；
Wherein, the AC power circuit input with the input terminal of the major loop and the valley value detection circuit respectively
End connection；The output end of the valley value detection circuit is connect with the second input terminal of the MCU；
The AC power circuit, is used to provide the described ac supply signal；
The valley value detection circuit, for detecting the ac supply signal corresponding valley moment, and by the exchange
The power supply signal corresponding valley moment is sent to the MCU.
Optionally, the valley value detection circuit includes: the second diode, third diode, the 4th diode, the 7th electricity
Resistance, the 8th resistance and third capacitor；
Wherein, the anode of second diode is connect with the first input end of the AC power circuit, the third
The anode of diode is connect with the second input terminal of the AC power circuit, the cathode of second diode and the third
The cathode of diode is all connect with the first end of the 7th resistance, and the second end of the 7th resistance is electric with the described 8th respectively
The first end of resistance, the second input terminal of positive, the described MCU of the 4th diode and the first end of the third capacitor connect
It connecing, the cathode of the 4th diode is connected with second electrical level, and the of the second end of the 8th resistance and the third capacitor
Two ends ground connection.
Optionally, the valley value detection circuit include: the 5th diode, the 6th diode, the 9th resistance, the tenth resistance,
Eleventh resistor, third capacitor, triode and twelfth resistor；
Wherein, the anode of the 5th diode is connect with the first input end of the AC power circuit, and the described 6th
The anode of diode is connect with the second input terminal of the AC power circuit, the cathode and the described 6th of the 5th diode
The cathode of diode is all connect with the first end of the 9th resistance, and the second end of the 9th resistance is electric with the third respectively
The first end of appearance, the first end of the tenth resistance, the connection of the first end of the eleventh resistor, the of the eleventh resistor
Two ends are connect with the base stage of the triode, the collector of the triode respectively with the second input terminal of the MCU and described
The first end of twelfth resistor connects, and the second of the twelfth resistor is terminated with third level, and the second of the third capacitor
The emitter ground connection at end, the second end of the tenth resistance and the triode.
The third aspect, the present invention provide a kind of electromagnetic heating utensil, comprising: the electromagnetic heating electricity as described in second aspect
Road.
Determination method, electromagnetic heating circuit and the electromagnetic heating utensil of valley calibration provided by the invention, are determined by MCU
Including N number of probe signal for souning out pulse, wherein each sending moment for souning out pulse is the corresponding valley of ac supply signal
The sum of moment and calibration duration, the corresponding valley moment at sending moment of any two exploration pulse and calibration duration are all different,
The probe signal is input in driving circuit again, so that driving circuit generation driving IGBT conducting includes N of same size
The driving signal of a driving pulse, and the initial time of N number of driving pulse is respectively N number of sending moment for souning out pulse.Then,
MCU determines the sending moment for souning out pulse corresponding with minimum current according to the minimum current in N number of conducting electric current of IGBT,
It determines again and issues moment corresponding calibration duration, thus, MCU can believe the AC power source surveyed according to the calibration duration
Number corresponding valley moment is calibrated, it is ensured that driving circuit driving IGBT is connected when drain voltage is minimum, solves existing
Since IGBT can not cause the starting current of IGBT excessive in the conducting of the valley moment of ac supply signal and damage in technology
The problem of bad component, reduces the conduction loss and conducting noise of IGBT module, extends the service life of IGBT module, mention
The high reliability of IGBT module.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the present invention or technical solution in the prior art
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is of the invention one
A little embodiments for those of ordinary skill in the art without any creative labor, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram of electromagnetic heating circuit provided by the invention；
Fig. 2 a is that N number of waveform for souning out moment corresponding ac supply signal shows in electromagnetic heating circuit provided by the invention
It is intended to；
Fig. 2 b is the waveform diagram of probe signal in electromagnetic heating circuit provided by the invention；
Fig. 3 a is the structural schematic diagram of electromagnetic heating circuit provided by the invention；
Fig. 3 b is the circuit diagram of electromagnetic heating circuit provided by the invention；
Fig. 4 a is the structural schematic diagram of electromagnetic heating circuit provided by the invention；
Fig. 4 b is the circuit diagram of electromagnetic heating circuit provided by the invention；
Fig. 5 is the structural schematic diagram of electromagnetic heating circuit provided by the invention；
Fig. 6 a is the circuit diagram of electromagnetic heating circuit provided by the invention；
Fig. 6 b is the circuit diagram of electromagnetic heating circuit provided by the invention；
Fig. 7 is the structural schematic diagram of electromagnetic heating utensil provided by the invention；
Fig. 8 is the flow chart of the determination method of valley provided by the invention calibration.
Appended drawing reference:
100-electromagnetic heating circuits；101-major loops；
102—IGBT；103-driving circuits；
104—MCU；105-current sampling circuits；
1011-filter circuits；1012-rectification circuits；
1013-resonance circuits；106-AC power circuits；
107-valley value detection circuits；10-electromagnetic heating utensils.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the attached drawing in the present invention, to this
Technical solution in invention is clearly and completely described, it is clear that and described embodiments are some of the embodiments of the present invention,
Instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative labor
Every other embodiment obtained under the premise of dynamic, shall fall within the protection scope of the present invention.
Fig. 1 is the structural schematic diagram of electromagnetic heating circuit provided by the invention, as shown in Figure 1, the present embodiment electromagnetic heating
Circuit 100 may include: major loop 101, IGBT 102, driving circuit 103 and micro-control unit (Microcontroller
Unit, MCU) 104.
Wherein, the output end of MCU 104 is connect with the input terminal of driving circuit 103, the output end of driving circuit 103 with
The input terminal of IGBT 102 connects, and the output end of IGBT 102 is connect with the output end of major loop 101.
MCU 104, for obtaining the ac supply signal corresponding valley moment.
MCU 104 is also used to determining probe signal, and probe signal includes N number of exploration pulse, each sending for souning out pulse
Moment is the sum of ac supply signal corresponding valley moment and calibration duration, and the sending moment that any two sound out pulse is corresponding
The valley moment and calibration duration it is all different, N is positive integer.
MCU 104 is also used to for probe signal being input in driving circuit 103, so that driving circuit 103 generates driving
The driving signal that IGBT 102 is connected, driving signal include N number of driving pulse of same size, N number of driving pulse it is initial when
Carving is respectively N number of sending moment for souning out pulse.
MCU 104 was also used within the pulse width corresponding period of N number of driving pulse, obtained the N number of of IGBT 102
Conducting electric current.
MCU 104 is also used to be connected corresponding minimum current according to IGBT 102, determines exploration corresponding with minimum current
The sending moment of pulse.
MCU 104, be also used to determine and issue moment corresponding calibration duration, wherein calibration duration is used for surveying
The ac supply signal corresponding valley moment is calibrated, so that driving circuit 103 drives IGBT 102 minimum in drain voltage
When be connected.
In the present embodiment, driving circuit 103 can be by the driving signal of output, to drive IGBT 102 to be connected and close
It is disconnected, allow major loop 101 to emit electromagnetic energy according to the on state or off state of IGBT 102 and is set to be heated
Standby (such as cookware) is heated, and can control electromagnetic heating circuit by the on state or off state of IGBT 102
100 power rating.Also, driving circuit 103 can also be by the driving signal of output, to drive IGBT 102 to be in amplification
Area.Wherein, the present embodiment to the number of IGBT 102 without limitation.
It will be understood by those skilled in the art that electromagnetic heating circuit 100 can need on detecting electromagnetic heating utensil 10
After heating equipment, and when detecting ac supply signal is valley, driving IGBT 102 starts to work.And actual conditions
In, there are phase differences between the turn-on instant when valley moment of ac supply signal and minimum 102 drain voltage of IGBT.Cause
This, the present embodiment can first sound out electromagnetic heating circuit 100, determine accurate phase difference.In turn, MCU 104 can
First to determine probe signal, wherein including N number of exploration pulse in the probe signal, each sending moment for souning out pulse is
The sum of ac supply signal corresponding valley moment and calibration duration, any two sound out the sending moment corresponding valley of pulse
Moment and calibration duration are all different.
A kind of feasible MCU 104 determine probe signal in the specific implementation, MCU 104 can be by ac supply signal pair
Any one the valley moment answered as initial time t1, and according to 2 Δ T of the period of ac supply signal, from the initial time
T1 rises, and successively estimates the ac supply signal corresponding valley moment, obtains N number of exploration moment.For example, such as Fig. 2 a institute
Show, when N number of exploration moment can be t1+ Δ T moment, t1+2 Δ T moment, t1+3 Δ T moment, t1+4 Δ T moment, t1+5 Δ T
It carves ....
In turn, MCU 104 successively adds N number of calibration duration according to sequence from small to large to N number of exploration moment again, obtains
N number of sending moment for souning out pulse, to determine the probe signal according to N number of sending moment for souning out pulse.
Wherein, the difference of any two calibration duration can be equal, can not also wait, the present embodiment does not limit this.For
It is convenient for practical operation, it is Δ t1 that the present embodiment, which sets equal for the difference of any two calibration duration,.For example, N number of
Calibration duration can be ... -3 Δ t1, -2 Δ t1,-Δ t1,0, Δ t1,2 Δ t1,3 Δ t1 ....
Optionally, the present embodiment can obtain N number of sending moment for souning out pulse according to formula one:
Tn=(t1+n × Δ T)-[M-n] × Δ t1 formula one；
Wherein, TnThe sending moment of pulse is soundd out for any one, t1 is initial time, and n is positive integer, and n≤N, Δ T
For the half period of ac supply signal,Or[M-n] × Δ t1 is calibration duration.
For example, when in probe signal including 6 pulses, the sending moment of 6 exploration pulses can be t1+ Δ T-
2 Δ t1 moment, t1+2 Δ T- Δ t1 moment, t1+3 Δ T moment, t1+4 Δ T+ Δ t1 moment, t1+5 Δ T+2 Δ t1 moment, t1+
6 Δ T+3 Δ t1 moment.
When in probe signal include 5 pulses, andWhen, 5 exploration pulses the sending moment can be
T1+ Δ T-2 Δ t1 moment, t1+2 Δ T- Δ t1 moment, t1+3 Δ T moment, t1+4 Δ T+ Δ t1 moment, t1+5 Δ T+2 Δ t1
Moment, as shown in Figure 2 b.
When in probe signal include 5 pulses, andWhen, 5 exploration pulses the sending moment can be
T1+ Δ T- Δ t1 moment, t1+2 Δ T moment, t1+3 Δ T+ Δ t1 moment, t1+4 Δ T+2 Δ t1 moment, t1+5 Δ T+3 Δ t1
Moment.
Further, after MCU 104 obtains probe signal, which can be input to driving by MCU 104
In circuit 103, so that driving circuit 103 generates the driving signal that driving IGBT 102 is connected, in this way, the driving signal includes width
Identical N number of driving pulse is spent, and the initial time of N number of driving pulse is just respectively N number of sending moment for souning out pulse.
Also, while driving current sends driving signal to IGBT 102, the N of the available IGBT 102 of MCU104
A turning circuit, and minimum current is selected from N number of conducting electric current.Since driving signal is obtained based on probe signal,
Therefore, the initial time of the corresponding driving pulse of minimum current can be the minimum current corresponding sending moment for souning out pulse,
In turn, MCU 104 can determine the sending moment for souning out pulse corresponding with the minimum current.
Further, since the sending moment for souning out pulse N number of in probe signal is all valley in ac supply signal
Add what different calibration durations obtained on the basis of moment, therefore, MCU 104 can calibration that the sending moment is corresponding when
The optimum phase between turn-on instant when long valley moment and minimum IGBT102 drain voltage as ac supply signal
Difference.
It for example, include 6 pulses in probe signal, the sending moment of 6 exploration pulses is respectively t1+ Δ T-2
Δ t1 moment, t1+2 Δ T- Δ t1, t1+3 Δ T moment, t1+4 Δ T+ Δ t1 moment, t1+5 Δ T+2 Δ t1 moment, t1+6 Δ T+
When 3 Δ t1 moment, if the conducting electric current of t1+2 Δ T- Δ t1 moment corresponding IGBT 102 is minimum current, AC power source letter
Number the valley moment and turn-on instant when minimum 102 drain voltage of IGBT between phase difference be Δ t1.If when t1+3 Δ T
The conducting electric current for carving corresponding IGBT 102 is minimum current, then the valley moment of ac supply signal and IGBT 102 drain electricity
The phase difference between turn-on instant when pressing minimum is 0.
Further, during actually opening 102 IGBT, MCU 104 can be according to the sending moment corresponding school
It is punctual long, the ac supply signal the surveyed corresponding valley moment is calibrated, so that driving circuit 103 can be generated and lead
The driving signal of logical IGBT 102, so that the valley of turn-on instant and ac supply signal when 102 drain voltage of IGBT is minimum
It differs minimum between moment, so that it is guaranteed that IGBT 102 can be connected when drain voltage is minimum, reduces 102 module of IGBT
104 generated the loss of great start-up current due to saturation conduction, played protection IGBT 102 and extended 102 service life of IGBT
Effect, reduce the cost of component.
Electromagnetic heating circuit provided in this embodiment determines to include N number of probe signal for souning out pulse by MCU, wherein
Each sending moment for souning out pulse is the sum of ac supply signal corresponding valley moment and calibration duration, and any two are soundd out
Corresponding valley moment at the sending moment of pulse and calibration duration are all different, then the probe signal is input in driving circuit,
So that driving circuit generates the driving signal including N number of driving pulse of same size of driving IGBT conducting, and N number of driving arteries and veins
The initial time of punching is respectively N number of sending moment for souning out pulse.Then, MCU is according to the minimum in N number of conducting electric current of IGBT
Electric current determines the sending moment for souning out pulse corresponding with minimum current, then determines and issue moment corresponding calibration duration, from
And MCU can calibrate the ac supply signal the surveyed corresponding valley moment according to the calibration duration, it is ensured that drive
Dynamic circuit drives IGBT is connected when drain voltage is minimum, solves in the prior art since IGBT can not be in ac supply signal
The valley moment conducting and cause the starting current of IGBT excessive and damage component the problem of, reduce leading for IGBT module
Logical loss and conducting noise, extend the service life of IGBT module, improve the reliability of IGBT module.
In the following, the specific structure for including in the electromagnetic heating circuit 100 of the present embodiment is described in detail.
As shown in Fig. 3 a and Fig. 4 a, the major loop 101 of the present embodiment may include: filter circuit 1011, rectification circuit
1012 and resonance circuit 1013.
Wherein, the output end of filter circuit 1011 is connect with the input terminal of rectification circuit 1012, resonance circuit 1011 it is defeated
Outlet is connect with the drain electrode of IGBT 102.
In the present embodiment, filter circuit 1011 can play the role of being filtered ac supply signal.Rectification circuit
Filtered ac supply signal (such as mains supply) can be rectified into pulsating dc voltage by 1012, facilitate supply resonance circuit
1013 operating voltages.Wherein, ac supply signal can be the single-phase sinusoidal voltage of 220V, 50HZ, or pass through
Mains supply after transformation, the present embodiment do not limit this, and the type of ac supply signal is only needed to can satisfy various work
Demand.And rectification circuit 1012 can be full-bridge rectifier, or half bridge rectifier, the present embodiment also do not do this
It limits.
In the present embodiment, driving circuit 103 can be by the driving signal of output, to drive IGBT 102 to be connected and close
It is disconnected, allow resonance circuit 1013 to treat heating equipment according to the switch state of IGBT 102 transmitting electromagnetic energy and is added
Heat.
Wherein, filter circuit 1011, rectification circuit 1012 and resonance circuit 1013 can be integrated chip, or
The circuit that multiple components are built, the present embodiment do not limit this.For example, filter circuit 1011 may include: filter inductance
And filter capacitor.Resonance circuit 1013 may include: heating coil and resonant capacitance.Wherein, the first of filter circuit 1011 is defeated
Heating coil is connected in series between outlet and the drain electrode of IGBT 102, resonant capacitance is connected in parallel on the both ends of heating coil.
Further, continue Fig. 3 a and Fig. 4 a, the present embodiment electromagnetic heating circuit 100 may be used also on the basis of Fig. 1 structure
To include: current sampling circuit 105.Wherein, current sampling circuit 105, it is corresponding for the pulse width in N number of driving pulse
In testing time section, electric current when IGBT 102 is connected is detected, and obtains N number of conducting electric current；And N number of conducting electric current is sent out
Give MCU 104.
Wherein, current sampling circuit 105 can be integrated chip, or the circuit that multiple components are built, this reality
Example is applied not limit this.And the connection that the present embodiment is linked into electromagnetic heating circuit 100 to current sampling circuit 105 does not limit
It is fixed.For ease of description, in conjunction with Fig. 3 a and Fig. 4 a, two kinds of connections of current sampling circuit 105 are shown.
In a kind of feasible implementation, as shown in Figure 3a, the positive output end and resonance circuit of rectification circuit 1012
1013 input terminal connection, the first input end of current sampling circuit 105 are connect with the negative sense output end of rectification circuit 1012, electricity
Second input terminal of stream sample circuit 105 is connect with the source electrode of IGBT 102, the output end and MCU of current sampling circuit 105
104 first input end connection.
Specifically, one end of current sampling circuit 105 is connected to the negative sense output end of rectification circuit 1012, other end connection
In the source electrode of IGBT 102, in the corresponding testing time section of pulse width of N number of driving pulse, i.e., driving circuit 103 to
While IGBT 102 sends driving signal, electric current when can be to the conducting of IGBT 102 is measured in real time, and obtains N number of lead
Galvanization.And N number of conducting electric current can be sent to MCU 104, be made by current sampling circuit 105 by the connection with MCU 104
It obtains MCU 104 and selects minimum current from N number of conducting electric current.
Wherein, the present embodiment to the specific structure of current sampling circuit 105 without limitation.A kind of feasible specific structure
In, as shown in Figure 3b, current sampling circuit 105 may include: first resistor, second resistance, 3rd resistor and first capacitor.
Wherein, the first end of first resistor respectively with the negative sense output end of rectification circuit 1012 and the first end of second resistance
Connection, the second end of second resistance connect with the source electrode of IGBT 102, the second end of second resistance respectively with MCU 104 first
The first end of input terminal, the first end of 3rd resistor and first capacitor connects, and the second end of 3rd resistor is connected with the first electricity
It is flat, the second end ground connection of first capacitor.
For ease of description, in Fig. 3 b, first resistor is labeled as R1, and second resistance is labeled as R2, and 3rd resistor is labeled as
R3, first capacitor are labeled as C1, and the first level flag is V1, illustrate to current sampling circuit 105.
In another feasible implementation, as shown in fig. 4 a, the negative sense output end and IGBT 102 of rectification circuit 1012
Source electrode connection, the first input end of current sampling circuit 105 connect with the positive output end of rectification circuit 1012, current sample
Second input terminal of circuit 105 is connect with the input terminal of resonance circuit 1013, the output end and MCU of current sampling circuit 105
104 first input end connection.
Specifically, one end of current sampling circuit 105 is connected to the positive output end of rectification circuit 1012, other end connection
In the input terminal of resonance circuit 1013, in the corresponding testing time section of pulse width of N number of driving pulse, i.e. driving circuit
103 while send driving signal to IGBT 102, and electric current when can be to the conducting of IGBT 102 is measured in real time, and is obtained
N number of conducting electric current.And N number of conducting electric current can be sent to MCU by the connection with MCU 104 by current sampling circuit 105
104, so that MCU 104 selects minimum current from N number of conducting electric current.
Wherein, the present embodiment to the specific structure of current sampling circuit 105 without limitation.A kind of feasible specific structure
In, as shown in Figure 4 b, current sampling circuit 105 may include: transformer, the 4th resistance, first diode, the 5th resistance,
Six resistance and the second capacitor.
Wherein, the first input end of transformer is connect with the positive output end of rectification circuit 1012, and the second of transformer is defeated
Outlet is connect with the input terminal of resonance circuit 1013, the first output end of transformer first end and first with the 4th resistance respectively
The anode connection of diode, the cathode of first diode are connect with the first end of the 5th resistance, the second end difference of the 5th resistance
It is connect with the first end of the 6th resistance, the first end of the second capacitor and the first input end of MCU104, the second of transformer is defeated
Outlet, the second end of the 4th resistance, the second end of the second end of the 6th resistance and the second capacitor ground connection.
For ease of description, in Fig. 4 b, transformer is labeled as CT, and the 4th resistance mark is R4, and first diode is labeled as
D1, the 5th resistance mark are R5, and the 6th resistance mark is R6, and the second capacitor is labeled as C2, shows current sampling circuit 105
Meaning.
In addition, as shown in figure 5, the electromagnetic heating circuit 100 of the present embodiment on the basis of Fig. 1, can also include: exchange
Power circuit 106 and valley value detection circuit 107.
Wherein, the input terminal with the input terminal of major loop 101 and valley value detection circuit 107 respectively of AC power circuit 106
Connection.The output end of valley value detection circuit 107 is connect with the second input terminal of MCU 104.
AC power circuit 106, for providing ac supply signal.
Valley value detection circuit 107, for detecting the ac supply signal corresponding valley moment, and by ac supply signal pair
The valley moment answered is sent to MCU 104.
In the present embodiment, valley value detection circuit 107 can detecte alternating current by the connection with AC power circuit 106
The ac supply signal corresponding valley moment in source circuit 106, and by the connection with MCU104, it can be by the AC power source
The signal corresponding valley moment is sent to MCU 104.
Wherein, valley value detection circuit 107 can be integrated chip, or the circuit that multiple components are built, this reality
Example is applied not limit this.And the present embodiment to the specific implementation of valley value detection circuit 107 without limitation.For the ease of saying
It is bright, in conjunction with Fig. 6 a and Fig. 6 b, the specific structure of valley value detection circuit 107 is described in detail.
In a kind of feasible embodiment, as shown in Figure 6 a, valley value detection circuit 107 may include: the second diode,
Three diodes, the 4th diode, the 7th resistance, the 8th resistance and third capacitor.
Wherein, the anode of the second diode is connect with the first input end of AC power circuit 106, and third diode is just
Pole is connect with the second input terminal of AC power circuit 106, and the cathode of the cathode of the second diode and third diode is all with
The first ends of seven resistance connects, the second end of the 7th resistance respectively with the first end of the 8th resistance, the 4th diode anode,
The first end connection of the second input terminal and third capacitor of MCU 104, the cathode of the 4th diode are connected with second electrical level, the
The second end of eight resistance and the second end ground connection of third capacitor.
For ease of description, in Fig. 6 a, the second diode is labeled as D2, and third diode is labeled as D3, the 4th diode
Labeled as D4, the 7th resistance mark is R7, and the 8th resistance mark is R8, and third capacitor is labeled as C3, and second electrical level is labeled as V2,
Valley value detection circuit 107 is illustrated.
In another feasible embodiment, as shown in Figure 6 b, valley value detection circuit 107 may include: the 5th diode,
6th diode, the 9th resistance, the tenth resistance, eleventh resistor, third capacitor, triode and twelfth resistor.
Wherein, the anode of the 5th diode is connect with the first input end of AC power circuit 106, and the 6th diode is just
Pole is connect with the second input terminal of AC power circuit 106, and the cathode of the cathode of the 5th diode and the 6th diode is all with
The first ends of nine resistance connects, the second end of the 9th resistance respectively with the first end of the 4th capacitor, the first end of the tenth resistance, the
The first end of 11 resistance connects, and the second end of eleventh resistor and the base stage of triode connect, the collector difference of triode
It being connect with the first end of the second input terminal of MCU104 and twelfth resistor, the second of twelfth resistor is terminated with third level,
The emitter of the second end of 4th capacitor, the second end of the tenth resistance and triode is grounded.
For ease of description, in Fig. 6 b, the 5th diode is labeled as D5, and the 6th diode is labeled as D6, the 9th resistance mark
It is denoted as R9, the tenth resistance mark is R10, and eleventh resistor is labeled as R11, and the 4th capacitor is labeled as Q1 labeled as C4, triode,
Twelfth resistor is labeled as R12, and third level flag is V3, illustrates to valley value detection circuit 107.
Fig. 7 is the structural schematic diagram of electromagnetic heating utensil provided by the invention, as shown in fig. 7, the electromagnetism of the present embodiment adds
Hot utensil 10 includes: the electromagnetic heating circuit 100 as shown in above-mentioned Fig. 1-Fig. 6 b.
Wherein, electromagnetic heating utensil 10 can include but is not limited to electric cooker, electric pressure cooker, soy bean milk making machine, coffee machine, stirring
The various utensils for needing to heat such as machine.
Electromagnetic heating utensil 10 provided in this embodiment includes that above-mentioned reality can be performed such as above-mentioned electromagnetic heating circuit 100
Example is applied, principle and technical effect are implemented, reference can be made to the technical solution of above-mentioned Fig. 1-Fig. 6 b illustrated embodiment, the present embodiment
Details are not described herein again.
Fig. 8 is the flow chart of the determination method of valley provided by the invention calibration, as shown in figure 8, the valley of the present embodiment
The determination method of calibration is applied to electromagnetic heating circuit 100 shown in above-mentioned Fig. 1-Fig. 6 b.The valley calibration of the present embodiment is really
The method of determining may include:
S101, determine that probe signal, probe signal include N number of exploration pulse, each sending moment for souning out pulse is to hand over
Galvanic electricity source signal corresponding valley moment and calibration the sum of duration, when any two sound out the sending moment corresponding valley of pulse
It carves and calibration duration is all different, N is positive integer.
S102, probe signal is input in driving circuit, so that driving circuit generates the driving letter of driving IGBT conducting
Number, driving signal includes N number of driving pulse of same size, and the initial time of N number of driving pulse is respectively N number of exploration pulse
Issue the moment.
S103, corresponding minimum current is connected according to IGBT, when determining the sending for souning out pulse corresponding with minimum current
It carves.
S104, sending moment corresponding calibration duration is determined, wherein calibration duration is used to believe the AC power source surveyed
Number corresponding valley moment is calibrated, so that driving circuit driving IGBT is connected when drain voltage is minimum.
In conjunction with Fig. 1-Fig. 6 b, the determination method of the valley calibration of the present embodiment can be with micro- in electromagnetic heating circuit 100
Processing unit MCU 104 is executing subject, and above-described embodiment can be performed in detailed process, implements principle and technical effect,
It can be found in the technical solution of above-mentioned Fig. 1-Fig. 6 b illustrated embodiment, details are not described herein again.
On the basis of above-mentioned Fig. 8 embodiment, one of S101 specific implementation can be that optionally, will exchange
Any one corresponding valley moment of power supply signal is as initial time；
According to the period of ac supply signal, from initial time, successively to the ac supply signal corresponding valley moment
Estimated, obtains N number of exploration moment；
N number of calibration duration according to sequence from small to large is successively added to N number of exploration moment, obtains N number of exploration pulse
Issue the moment；
According to N number of sending moment for souning out pulse, probe signal is determined.
Optionally, according to formula one, N number of sending moment for souning out pulse is obtained:
Tn=(t1+n × Δ T)-[M-n] × Δ t1 formula one；
Wherein, TnThe sending moment of pulse is soundd out for any one, t1 is initial time, and n is positive integer, and n≤N, Δ T
For the half period of ac supply signal,Or[M-n] × Δ t1 is calibration duration.
On the basis of above-mentioned Fig. 8 embodiment, before S103, this method can also include:
Within the pulse width corresponding period of N number of driving pulse, electric current when IGBT is connected is detected, and is obtained
N number of conducting electric current；
Minimum current is selected from N number of conducting electric current.
On the basis of above-mentioned Fig. 8 embodiment, a kind of specific implementation is in S103, optionally it is determined that with minimum electricity
Flow the initial time of corresponding driving pulse；
According to the initial time of driving pulse, the corresponding sending moment for souning out pulse is determined.
In conjunction with Fig. 1-Fig. 6 b, the determination method of the valley calibration of the present embodiment can be with micro- in electromagnetic heating circuit 100
Processing unit MCU 104 is executing subject, and above-described embodiment can be performed in detailed process, implements principle and technical effect,
It can be found in the technical solution of above-mentioned Fig. 1-Fig. 6 b illustrated embodiment, details are not described herein again.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (17)
1. a kind of determination method of valley calibration characterized by comprising
Determine that probe signal, the probe signal include N number of exploration pulse, each sending moment for souning out pulse is AC power source
The sum of signal corresponding valley moment and calibration duration, any two sound out corresponding valley moment at sending moment and the school of pulse
Punctual long all different, N is positive integer；
The probe signal is input in driving circuit (103), so that the driving circuit (103) generates driving IGBT
(102) driving signal be connected, the driving signal include N number of driving pulse of same size, N number of driving pulse just
Moment beginning is respectively N number of sending moment for souning out pulse；
According to the minimum current in N number of conducting electric current of the IGBT (102), exploration arteries and veins corresponding with the minimum current is determined
The sending moment of punching；
Determine the sending moment corresponding calibration duration, wherein the calibration duration is used to believe the AC power source surveyed
Number corresponding valley moment is calibrated, so that the driving circuit (103) drives the IGBT (102) minimum in drain voltage
When be connected.
2. the method according to claim 1, wherein the determining probe signal, comprising:
Using any one corresponding valley moment of the ac supply signal as initial time；
According to the period of the ac supply signal, from the initial time, valley corresponding to the ac supply signal
Moment is successively estimated, N number of exploration moment is obtained；
N number of calibration duration according to sequence from small to large is successively added to N number of exploration moment, obtains N number of exploration arteries and veins
The sending moment of punching；
According to N number of sending moment for souning out pulse, the probe signal is determined.
3. according to the method described in claim 2, it is characterized in that, according to formula one, when obtaining N number of sending for souning out pulse
It carves:
Tn=(t1+n × Δ T)-[M-n] × Δ t1 formula one；
Wherein, TnThe sending moment of pulse is soundd out for any one, t1 is the initial time, and n is positive integer, and n≤N, Δ T
For the half period of the ac supply signal,Or[M-n] × Δ t1 is calibration duration.
4. method according to claim 1-3, which is characterized in that corresponded to being connected according to the IGBT (102)
Minimum current, determine it is corresponding with the minimum current exploration pulse the sending moment before, the method also includes:
Within the pulse width corresponding period of N number of driving pulse, the electric current when IGBT (102) are connected is carried out
Detection, obtains N number of conducting electric current；
The minimum current is selected from N number of conducting electric current.
5. method according to claim 1-3, which is characterized in that described according to the IGBT (102) conducting pair
The minimum current answered determines the sending moment for souning out pulse corresponding with the minimum current, comprising:
Determine the initial time of driving pulse corresponding with the minimum current；
According to the initial time of the driving pulse, the corresponding sending moment for souning out pulse is determined.
6. a kind of electromagnetic heating circuit (100) characterized by comprising major loop (101), insulated gate bipolar transistor
IGBT (102), driving circuit (103) and micro-control unit MCU (104)；
Wherein, the output end of the MCU (104) is connect with the input terminal of the driving circuit (103), the driving circuit
(103) output end is connect with the input terminal of the IGBT (102), the output end and the major loop of the IGBT (102)
(101) output end connection；
The MCU (104), for obtaining the ac supply signal corresponding valley moment；
The MCU (104) is also used to determining probe signal, and the probe signal includes N number of exploration pulse, each exploration pulse
The sending moment be the ac supply signal corresponding valley moment and calibration the sum of duration, any two sound out the hair of pulse
Corresponding valley moment at moment and calibration duration are all different out, and N is positive integer；
The MCU (104) is also used to for the probe signal being input in the driving circuit (103), so that the driving is electric
Road (103) generates the driving signal of driving IGBT (102) conducting, and the driving signal includes N number of driving pulse of same size,
The initial time of N number of driving pulse is respectively N number of sending moment for souning out pulse；
The MCU (104) is also used within the pulse width corresponding period of N number of driving pulse, obtains the IGBT
(102) N number of conducting electric current；
The MCU (104) is also used to according to the minimum current in N number of conducting electric current, and determination is corresponding with the minimum current
Exploration pulse the sending moment；
The MCU (104) is also used to determine the sending moment corresponding calibration duration, wherein the calibration duration for pair
The ac supply signal the surveyed corresponding valley moment is calibrated, so that the driving circuit (103) drives the IGBT
(102) it is connected when drain voltage is minimum.
7. electromagnetic heating circuit (100) according to claim 6, which is characterized in that the electromagnetic heating circuit (100) is also
It include: current sampling circuit (105)；The major loop (101) includes: sequentially connected filter circuit (1011), rectification circuit
(1012) and resonance circuit (1013), the output end of the resonance circuit (1011) are connect with the drain electrode of the IGBT (102)；
Wherein, the first input end of the current sampling circuit (105) and the negative sense output end of the rectification circuit (1012) connect
It connects, the second input terminal of the current sampling circuit (105) is connect with the source electrode of the IGBT (102), the current sample electricity
The output end on road (105) is connect with the first input end of the MCU (104)；
The current sampling circuit (105), in the corresponding testing time section of pulse width in N number of driving pulse,
Electric current when to the IGBT (102) conducting detects, and obtains N number of conducting electric current；And N number of conducting electric current is sent out
Give the MCU (104).
8. electromagnetic heating circuit (100) according to claim 7, which is characterized in that current sampling circuit (105) packet
It includes: first resistor, second resistance, 3rd resistor and first capacitor；
Wherein, the first end of the first resistor respectively with the negative sense output end of the rectification circuit (1012) and it is described second electricity
The first end of resistance connects, and the second end of the first resistor is connect with the source electrode of the IGBT (102), and the of the second resistance
Two ends respectively with the first input end of the MCU (104), the first end of the 3rd resistor and the first capacitor second
End connection, the second end of the 3rd resistor are connected with the first level, the second end ground connection of the first capacitor.
9. electromagnetic heating circuit (100) according to claim 6, which is characterized in that the electromagnetic heating circuit (100) is also
It include: current sampling circuit (105)；The major loop (101) include: filter circuit (1011), rectification circuit (1012) and
Resonance circuit (1013)；
Wherein, the output end of the filter circuit (1011) is connect with the input terminal of the rectification circuit (1012), the rectification
The negative sense output end of circuit (1012) is connect with the source electrode of the IGBT (102), the output end of the resonance circuit (1011) with
The drain electrode of the IGBT (102) connects；
The first input end of the current sampling circuit (105) is connect with the positive output end of the rectification circuit (1012), institute
The second input terminal for stating current sampling circuit (105) is connect with the input terminal of the resonance circuit (1013), the current sample
The output end of circuit (105) is connect with the first input end of the MCU (104)；
The current sampling circuit (105), in the corresponding testing time section of pulse width in N number of driving pulse,
Electric current when to the IGBT (102) conducting detects, and obtains N number of conducting electric current；And N number of conducting electric current is sent to
The MCU (104).
10. electromagnetic heating circuit (100) according to claim 9, which is characterized in that the current sampling circuit (105)
It include: transformer, the 4th resistance, first diode, the 5th resistance, the 6th resistance and the second capacitor；
Wherein, the first input end of the transformer is connect with the positive output end of the rectification circuit (1012), the transformation
The second output terminal of device is connect with the input terminal of the resonance circuit (1013), the first output end of the transformer respectively with institute
State the anode connection of the first end and the first diode of the 4th resistance, the cathode of the first diode and the 5th electricity
The first end of resistance connects, the second end of the 5th resistance respectively with the first end of the 6th resistance, second capacitor
The connection of the first input end of first end and the MCU (104), the second output terminal of the transformer, the 4th resistance
The second end of second end, the second end of the 6th resistance and the second capacitor is grounded.
11. according to the described in any item electromagnetic heating circuits of claim 6-10 (100), which is characterized in that the MCU (104),
Specifically for using any one corresponding valley moment of the ac supply signal as initial time；According to the AC power source
The period of signal successively estimates the ac supply signal corresponding valley moment, obtains from the initial time
N number of exploration moment；N number of calibration duration according to sequence from small to large is successively added to N number of exploration moment, obtains the N
A sending moment for souning out pulse；According to N number of sending moment for souning out pulse, the probe signal is determined.
12. electromagnetic heating circuit (100) according to claim 11, which is characterized in that according to formula one, obtain N number of examination
Visit the sending moment of pulse:
Tn=(t1+n × Δ T)-[M-n] × Δ t1 formula one；
Wherein, TnThe sending moment of pulse is soundd out for any one, t1 is the initial time, and n is positive integer, and n≤N, Δ T
For the half period of the ac supply signal,Or[M-n] × Δ t1 is calibration duration.
13. according to the described in any item electromagnetic heating circuits of claim 6-10 (100), which is characterized in that the MCU (104),
Also particularly useful for the initial time for determining driving pulse corresponding with the minimum current；According to the driving pulse it is initial when
It carves, determines the corresponding sending moment for souning out pulse.
14. according to the described in any item electromagnetic heating circuits of claim 6-10 (100), which is characterized in that the electromagnetic heating
Circuit (100) further include: AC power circuit (106) and valley value detection circuit (107)；
Wherein, the AC power circuit (106) respectively with the input terminal and the valley value detection circuit of the major loop (101)
(107) input terminal connection；The output end of the valley value detection circuit (107) and second input terminal of the MCU (104) connect
It connects；
The AC power circuit (106), is used to provide the described ac supply signal；
The valley value detection circuit (107), for detecting the ac supply signal corresponding valley moment, and by the exchange
The power supply signal corresponding valley moment is sent to the MCU (104).
15. electromagnetic heating circuit (100) according to claim 14, which is characterized in that the valley value detection circuit (107)
It include: the second diode, third diode, the 4th diode, the 7th resistance, the 8th resistance and third capacitor；
Wherein, the anode of second diode is connect with the first input end of the AC power circuit (106), the third
The anode of diode is connect with the second input terminal of the AC power circuit (106), the cathode of second diode and institute
The cathode for stating third diode is all connect with the first end of the 7th resistance, the second end of the 7th resistance respectively with it is described
The first end of 8th resistance, the 4th diode positive, the described MCU (104) the second input terminal and the third electricity
The first end of appearance connects, and the cathode of the 4th diode is connected with second electrical level, the second end of the 8th resistance and described
The second end of third capacitor is grounded.
16. electromagnetic heating circuit (100) according to claim 14, which is characterized in that the valley value detection circuit (107)
It include: the 5th diode, the 6th diode, the 9th resistance, the tenth resistance, eleventh resistor, third capacitor, triode and
12 resistance；
Wherein, the anode of the 5th diode is connect with the first input end of the AC power circuit (106), and the described 6th
The anode of diode is connect with the second input terminal of the AC power circuit (106), the cathode of the 5th diode and institute
The cathode for stating the 6th diode is all connect with the first end of the 9th resistance, the second end of the 9th resistance respectively with it is described
The first end of third capacitor, the first end of the tenth resistance, the connection of the first end of the eleventh resistor, the 11st electricity
The second end of resistance is connect with the base stage of the triode, and the collector of the triode is defeated with the second of the MCU (104) respectively
Enter end to connect with the first end of the twelfth resistor, the second of the twelfth resistor is terminated with third level, the third
The emitter of the second end of capacitor, the second end of the tenth resistance and the triode is grounded.
17. a kind of electromagnetic heating utensil characterized by comprising such as the described in any item electromagnetic heating electricity of claim 6-16
Road (100).
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