CN208754576U - Electromagnetic heating circuit and electromagnetic heating appliance - Google Patents
Electromagnetic heating circuit and electromagnetic heating appliance Download PDFInfo
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- CN208754576U CN208754576U CN201821195949.1U CN201821195949U CN208754576U CN 208754576 U CN208754576 U CN 208754576U CN 201821195949 U CN201821195949 U CN 201821195949U CN 208754576 U CN208754576 U CN 208754576U
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Abstract
The utility model provides an electromagnetic heating circuit (100) and electromagnetic heating utensil (10). The electromagnetic heating circuit (100) comprises: rectifier circuit (101), filter circuit (102), resonance circuit (103), IGBT module (104), drive circuit (106) that connect gradually and little processing unit (105) of being connected with filter circuit (102), resonance circuit (103), drive circuit (106) respectively the utility model discloses make IGBT module (104) zero passage switch on for the first time, the utility model provides a current electromagnetic heating circuit because the starting current of IGBT module is too big and cause the problem that the IGBT module damaged, reduced the loss of IGBT module, prolonged the life of IGBT module, improved the reliability of IGBT module.
Description
Technical field
The utility model relates to electromagentic furnace technology field more particularly to a kind of electromagnetic heating circuits 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.
Fig. 1 is the structural schematic diagram of existing electromagnetic heating circuit, as shown in Figure 1, existing electromagnetic heating circuit 200 includes:
Existing rectification circuit 201, existing filter circuit 202, existing resonance circuit 203, existing insulated gate bipolar transistor
(Insulated Gate Bipolar Transistor, IGBT) module 204, existing driving circuit 205, existing zero passage detection
Circuit 206, existing microprocessing unit 207.In general, when existing IGBT module 204 is when zero passage voltage is connected, electric current and loss
All very small, existing IGBT module 204 is in safety operation area.When existing IGBT module 204 high voltage be connected when, have
Very big pulse current, electric current is excessive, is more easily damaged existing IGBT module 204, so that influence existing IGBT module 204 can
By property.
However, in existing electromagnetic heating circuit 200, when filtering detection circuit detects that alternating voltage is zero, due to existing
There is filter circuit 202 that there is energy storage effect to lead to existing IGBT module so that having voltage in the drain electrode of existing IGBT module 204
204 can not zero crossing conducting, be easy to cause the starting current of existing IGBT module 204 excessive and lead to the damage of component.
Utility model content
In order to solve the problems, such as at least one mentioned in background technique, the utility model provide a kind of electromagnetic heating circuit and
Electromagnetic heating utensil, by reducing the drain voltage of IGBT module so that IGBT module when being connected for the first time can with zero crossing, thus
The starting current for reducing IGBT module reduces the conduction loss and conducting noise of IGBT module.
In a first aspect, the utility model provides a kind of electromagnetic heating circuit, comprising: rectification circuit, filter circuit, resonance electricity
Road, insulated gate bipolar transistor IGBT module, microprocessing unit and driving circuit；
Wherein, the rectification circuit is for rectifying the line voltage of input, the positive output of the rectification circuit
End connect with the first input end of the filter circuit, the first output end of the filter circuit respectively with the resonance circuit
Input terminal is connected with the first input end of the microprocessing unit, the output end of the resonance circuit respectively with the IGBT module
Drain electrode connected with the second input terminal of the microprocessing unit, the negative sense output end of the rectification circuit and the filter circuit
The second input terminal connection, the source grounding of the second output terminal of the filter circuit and the IGBT module, micro- place
The output end of reason unit is connect with the input terminal of the driving circuit, and the grid of the IGBT module is defeated with the driving circuit
Outlet connection.
Optionally, the electromagnetic heating circuit further include: adjust circuit；
Wherein, the adjustable side for adjusting circuit is connect with the control terminal of the microprocessing unit, the adjusting circuit
First end is connect with the grid of the IGBT module, and the output end of the second end for adjusting circuit and the driving circuit connects
It connects.
Optionally, the adjusting circuit includes: adjustable resistance and discharge module；
Wherein, the grid of the IGBT module respectively with the first end of the adjustable resistance and the discharge module first
End connection, the output end of the driving circuit connect with the second end of the adjustable resistance and the second end of the discharge module respectively
It connects, the control terminal of the microprocessing unit is connect with the adjustable side of the adjustable resistance.
Optionally, the microprocessing unit includes: zero cross detection circuit, sync detection circuit and PPG programme pulse generator
PPG；
Wherein, the first input end of the zero cross detection circuit inputs the predeterminated voltage, the zero cross detection circuit
Second input terminal is connect with the first input end of the sync detection circuit, the first input end of the sync detection circuit and institute
State the first output end connection of filter circuit, the second input terminal of the sync detection circuit and the output end of the resonance circuit
The output end of connection, the output end of the zero cross detection circuit and the sync detection circuit connects with the input terminal of the PPG
It connects, the output end of the PPG is connect with the input terminal of the driving circuit.
Optionally, the microprocessing unit includes: zero cross detection circuit, sync detection circuit and PPG programme pulse generator
PPG；
Wherein, the first input end of the zero cross detection circuit inputs the predeterminated voltage, the zero cross detection circuit
The first input end of second input terminal and the sync detection circuit the first output end with the filter circuit respectively, it is described same
Second input terminal of step detection circuit is connect with the output end of the resonance circuit, the output end of the zero cross detection circuit and institute
The output end for stating sync detection circuit is connect with the input terminal of the PPG, the output end of the PPG and the driving circuit
Input terminal connection.
Optionally, the electromagnetic heating circuit further includes；First bleeder circuit and the second bleeder circuit；
Wherein, first bleeder circuit and second bleeder circuit are the identical circuit of parameter；First partial pressure
The input terminal of circuit is connect with the first output end of the filter circuit, the input terminal and the resonance of second bleeder circuit
The output end of circuit connects, and the output end of first bleeder circuit is connect with the first input end of the microprocessing unit, institute
The output end for stating the second bleeder circuit is connect with the second input terminal of the microprocessing unit.
Optionally, the electromagnetic heating circuit further includes；Preventing jittering circuit；
Wherein, the first end of the preventing jittering circuit is connected to the output end of first bleeder circuit and described micro-
Between the first input end of processing unit, the second end of the preventing jittering circuit is connected to the defeated of second bleeder circuit
Between outlet and the second input terminal of the microprocessing unit.
Optionally, the resonance circuit includes: heating coil and resonant capacitance；
Wherein, the heater wire is connected in series between the first output end of filter circuit and the drain electrode of the IGBT module
Circle, the resonant capacitance are connected in parallel on the both ends of the heating coil.
Optionally, the filter circuit includes: filter inductance and filter capacitor；
Wherein, the positive output end of the rectification circuit is connect with the input terminal of the filter inductance, the filter capacitor
First end and second end be connected in parallel between the output end of the filter inductance and the negative sense output end of the rectification circuit, it is described
The first end of filter capacitor is also connect with the first input end of the input terminal of the resonance circuit and the microprocessing unit respectively.
Second aspect, the utility model provide a kind of electromagnetic heating utensil, comprising: electromagnetic heating as described in relation to the first aspect
Circuit.
Electromagnetic heating circuit and electromagnetic heating utensil provided by the utility model is detecting electromagnetism by microprocessing unit
When having cookware on heating utensil, zero probe signal is transmitted across to driving circuit.Driving circuit can drive according to zero passage probe signal
Dynamic IGBT module is in amplification region, and the duration in amplification region is less than or equal to preset duration each time, to consume filter circuit
The energy of storage, to reduce the drain voltage of filter circuit both end voltage and IGBT module.Due to filter circuit and rectification circuit
Be connected in parallel, therefore, microprocessing unit the both end voltage of filter circuit can be less than or equal to for the first time predeterminated voltage it is corresponding when
It carves, is determined as the zero crossing of alternating voltage, and then be transmitted across zero interrupt signal to driving circuit, driving IGBT module is in full
And area, so that in the drain voltage minimum of IGBT module and the zero passage point moment IGBT module conducting for the first time of alternating voltage, from
And solve the problems, such as that existing electromagnetic heating circuit causes IGBT module to damage since the starting current of IGBT module is excessive, it drops
The low loss of IGBT module, extends the service life of IGBT module, improves the reliability of IGBT module.
Detailed description of the invention
In order to clearly demonstrate the utility model embodiment or technical solution in the prior art, below will to embodiment or
Attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is this
Some embodiments of utility model embodiment, for those of ordinary skill in the art, in not making the creative labor property
Under the premise of, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of existing electromagnetic heating circuit；
Fig. 2 is the structural schematic diagram of electromagnetic heating circuit provided by the utility model；
Fig. 3 is the structural schematic diagram of electromagnetic heating circuit provided by the utility model；
Fig. 4 is the circuit diagram of electromagnetic heating circuit provided by the utility model；
Fig. 5 is the circuit diagram of electromagnetic heating circuit provided by the utility model；
Fig. 6 is the circuit diagram of electromagnetic heating circuit provided by the utility model；
Fig. 7 (a) signal after rectification circuit for the mains supply in electromagnetic heating circuit provided by the utility model
Waveform diagram；
Fig. 7 (b) is the wave of signal on filter capacitor in filter circuit in electromagnetic heating circuit provided by the utility model
Shape schematic diagram；
Fig. 7 (c) is the waveform signal of signal on the output end of the PPG in electromagnetic heating circuit provided by the utility model
Figure；
Fig. 7 (d) is signal on the output end of the zero cross detection circuit in electromagnetic heating circuit provided by the utility model
Waveform diagram；
Fig. 8 is the structural schematic diagram of electromagnetic heating utensil provided by the utility model；
Fig. 9 is the flow chart of zero passage detection method provided by the utility model；
Figure 10 is the flow chart of zero passage detection method provided by the utility model；
Figure 11 is the flow chart of zero passage detection method provided by the utility model.
Appended drawing reference:
100-electromagnetic heating circuits；200-existing electromagnetic heating circuits；
101-rectification circuits；201-existing rectification circuits；
102-filter circuits；202-existing filter circuits；
103-resonance circuits；203-existing resonance circuits；
104-IGBT modules；204-existing IGBT modules；
105-microprocessing units；205-existing driving circuits；
1051-zero cross detection circuits；206-existing zero cross detection circuits；
1052-sync detection circuits；207-existing microprocessing units；
1053—PPG；106-driving circuits；
107-adjust circuit；1071-adjustable resistances；
1072-discharge modules；1081-the first bleeder circuit；
1082-the second bleeder circuit；1083-preventing jittering circuits；
10-electromagnetic heating utensils.
Specific embodiment
As shown in Figure 1, existing microprocessing unit 207 is detecting electromagnetic heating utensil in existing electromagnetic heating circuit 200
It, can be to existing drive after having cookware on 10, and when detecting the zero crossing of alternating voltage by existing zero cross detection circuit 206
Dynamic circuit 205 sends synchronous pulse, i.e. zero passage interrupt signal, to drive existing IGBT module 204 to work normally, so that existing
Electromagnetic heating circuit 200 is begun to warm up.However, due to being connected with existing filter circuit 202 after existing rectification circuit 201, it is existing
There is filter circuit 202 that there is energy-storage function, and the drain electrode of existing IGBT module 204 passes through existing resonance circuit 203 and existing filter
The connection of wave circuit 202 causes existing IGBT module 204 to be connected for the first time so that the drain voltage of existing IGBT module 204 is excessively high
It is difficult to be connected in the zero crossing of alternating voltage, causes the conduction loss of existing IGBT module 204, be easy to make a noise.For upper
Problem is stated, the electromagnetic heating circuit 100 of the present embodiment can be connected with zero crossing when IGBT module 104 is connected for the first time, be subtracted
The loss of few IGBT module 104.
In the following, the specific structure of the electromagnetic heating circuit 100 of the present embodiment is described in detail.Fig. 2 is that this is practical new
The structural schematic diagram for the electromagnetic heating circuit that type provides, as shown in Fig. 2, the electromagnetic heating circuit 100 of the present embodiment may include:
Rectification circuit 101, filter circuit 102, resonance circuit 103, IGBT module 104, microprocessing unit 105 and driving circuit 106.
Wherein, rectification circuit 101 is for rectifying the line voltage of input, the positive output end of rectification circuit 101
It is connect with the first input end of filter circuit 102, the input with resonance circuit 103 respectively of the first output end of filter circuit 102
End is connected with the first input end of microprocessing unit 105, the drain electrode with IGBT module 104 respectively of the output end of resonance circuit 103
It is connected with the second input terminal of microprocessing unit 105, the second of the negative sense output end of rectification circuit 101 and filter circuit 102 is defeated
Enter end connection, the second output terminal of filter circuit 102 and the source grounding of IGBT module 104, microprocessing unit 105 it is defeated
Outlet is connect with the input terminal of driving circuit 106, and the grid of IGBT module 104 is connect with the output end of driving circuit 106.
Microprocessing unit 105 when for having cookware on detecting electromagnetic heating utensil 10, is sent to driving circuit 106
Zero passage probe signal；After being transmitted across zero probe signal to driving circuit 106, when the both ends for determining filter circuit 102 for the first time
When voltage is less than or equal to predeterminated voltage, it is transmitted across zero interrupt signal to driving circuit 106, the pulse number of zero passage interrupt signal is small
In the pulse number of zero passage probe signal.
For driving IGBT module 104 to be in amplification region according to zero passage probe signal, and IGBT is arranged in driving circuit 106
The duration in amplification region is less than or equal to preset duration to module 104 each time；According to zero passage interrupt signal, IGBT module is driven
104 are in saturation region, so that IGBT module 104 first time passing zero trigger.
In the present embodiment, the mains supply of input can be rectified into pulsating dc voltage by rectification circuit 101, facilitate supply
103 operating voltage of resonance circuit.Wherein, mains supply can be the single-phase sinusoidal voltage of 220V, 50HZ, or warp
Mains supply after crossing transformation, the present embodiment do not limit this, and only needing the type of mains supply to can satisfy various work needs
It asks.And rectification circuit 101 can be full-bridge rectifier, or half bridge rectifier, the present embodiment also do not limit this
It is fixed.
In the present embodiment, driving circuit 106 can by the driving signal of output, come drive the conducting of IGBT module 104 and
Shutdown allows resonance circuit 103 to emit electromagnetic energy according to the switch state of IGBT module 104 and treats heating equipment progress
It heats, and can control the power rating of electromagnetic heating circuit 100 by the switch state of IGBT module 104.Also, driving electricity
It road 106 can also be by the driving signal of output, to drive IGBT module 104 to be in amplification region.Wherein, the present embodiment is to IGBT
The number of module 104 is without limitation.
It will be understood by those skilled in the art that existing electromagnetic heating circuit 100 can detect electromagnetic heating utensil 10
On have cookware after, and detect rectification circuit 101 exchange end alternating voltage zero-crossing point when, drive IGBT module 104
It starts to work.And in the electromagnetic heating circuit 100 of the present embodiment, microprocessing unit 105 can detecte on electromagnetic heating utensil 10
Whether there is cookware, and when having cookware on detecting electromagnetic heating utensil 10, zero exploration letter can be transmitted across to driving circuit 106
Number, not zero passage interrupt signal.
Wherein, the pulse number of zero passage probe signal is more than the pulse number of zero passage interrupt signal, is interrupted and is believed according to zero passage
Number generate driving signal can drive 104 saturation conduction of IGBT module.And microprocessing unit 105 can be integrated chip,
It can not limited this for the circuit that microprocessing unit 105 and multiple components are built in the prior art, the present embodiment.
Further, driving circuit 106, can be to 104 output driving of IGBT module when receiving zero passage probe signal
Signal.Since filter circuit 102 has energy storage effect, and rectification circuit 101 and filter circuit 102 are connected in parallel, IGBT module
104 drain electrode passes through the connection of resonance circuit 103 and filter circuit 102, so that the drain voltage of IGBT module 104 and filtering
The both end voltage of circuit 102 is equal.Again since the pulse number of zero passage probe signal is more than the pulse number of zero passage interrupt signal,
Therefore, the time of each pulse persistance is shorter in zero passage probe signal, so that driving signal only drives IGBT module 104 to be in
Amplification region, and noise is smaller at this time.Although IGBT module 104 is in amplification region, it, which drains, still has electric current stream between source electrode
It crosses, is returned in this way, filter circuit 102, resonance circuit 103, the drain electrode of IGBT module 104 and source electrode and ground may be constructed one
Road, filter circuit 102 can start to charge resonance circuit 103, the energy of itself storage be discharged, so that filter circuit 102
Both end voltage and the drain voltage of IGBT module 104 reduce.
It will be understood by those skilled in the art that the saturation of IGBT module 104 is led when the drain electrode of IGBT module 104 has voltage
The logical dash current generated is very big, and the electric current for easily leading to resonance circuit 103 and IGBT module 104 is excessive, even more than its safety
Working range, not only IGBT module 104 can generate noise, but also work long hours and be easily damaged component, therefore, driving circuit
106 under the control of zero passage probe signal, IGBT module 104 can be driven to be in amplification region, and IGBT module 104 is located each time
Duration in amplification region is needed to be less than equal to preset duration, so that IGBT module 104 has little time saturation conduction.And work as IGBT module
104 be in amplification region when, the both end voltage of filter circuit 102 can be reduced, due to IGBT module 104 can be repeated as many times and even
It is continuous to be in amplification region, the both end voltage of filter circuit 102 can be made to move closer to 0V or for 0V.
Wherein, preset duration is needed to be less than equal to IGBT module 104 usually from cut-off region to amplification region again to saturation region institute
Duration.General preset duration takes the arbitrary number between 500ns-1.5 μ s.
Further, variation is synchronized as alternating voltage constantly changes due to the both end voltage of filter circuit 102, because
This, whether microprocessing unit 105 can be less than or equal to predeterminated voltage by the both end voltage of detection filter circuit 102, to determine
The zero crossing of alternating voltage, and when alternating voltage passes through zero crossing, the both end voltage and IGBT module 104 of filter circuit 102
Drain voltage it is minimum, normally close to 0V, not only can be since alternating voltage will receive to avoid existing electromagnetic heating circuit 100
The factors such as system interference and cause zero-crossing examination inaccurate, cause to mislead IGBT module 104 the problem of, also reduce IGBT mould
Block 104 generated the loss of great start-up current due to saturation conduction.Wherein, predeterminated voltage can be set to be close to 0V, or
Person is 0V, and the present embodiment does not limit this.
Further, when the both end voltage of filter circuit 102 is less than or equal to predeterminated voltage for the first time, microprocessing unit 105
Zero interrupt signal can be transmitted across to driving circuit 106.It is driven in this way, driving circuit 106 can be exported according to zero passage interrupt signal
Dynamic signal, the driving signal can make IGBT mould in the drain voltage minimum and alternating voltage zero-crossing point of IGBT module 104
Block 104 is connected for the first time, to realize the normal work of IGBT module 104, slows down the calorific value of IGBT module 104, reduces
The loss of IGBT module 104 and noise.
Electromagnetic heating circuit provided in this embodiment has cookware on detecting electromagnetic heating utensil by microprocessing unit
When, zero probe signal is transmitted across to driving circuit.Driving circuit can drive IGBT module to be in and put according to zero passage probe signal
Great Qu, and the duration in amplification region is less than or equal to preset duration each time, to consume the energy of filter circuit storage, to reduce
The drain voltage of filter circuit both end voltage and IGBT module.Since filter circuit and rectification circuit are connected in parallel, micro- place
At the time of the both end voltage of filter circuit can be less than or equal to predeterminated voltage for the first time and corresponds to by reason unit, it is determined as alternating voltage
Zero crossing, and then it is transmitted across zero interrupt signal to driving circuit, driving IGBT module is in saturation region, so that in IGBT module
Drain voltage minimum and the conducting for the first time of the zero passage point moment IGBT module of alternating voltage, to solve existing electromagnetic heating electricity
Route the starting current in IGBT module it is excessive and the problem of cause IGBT module to damage, reduce the loss of IGBT module, prolong
The service life for having grown IGBT module improves the reliability of IGBT module.
Firstly, being carried out specifically in conjunction with Fig. 3 to the specific structure that the electromagnetic heating circuit 100 of the present embodiment may include
It is bright.Fig. 3 is the structural schematic diagram of electromagnetic heating circuit 100 provided by the utility model, as shown in figure 3, the electromagnetism of the present embodiment
For heater circuit 100 on the basis of Fig. 2, electromagnetic heating circuit 100 can also include: to adjust circuit 107.
Wherein, the adjustable side for adjusting circuit 107 is connect with the control terminal of microprocessing unit 105, adjusts the first of circuit 107
End is connect with the grid of IGBT module 104, and the second end for adjusting circuit 107 is connect with the output end of driving circuit 106.
Microprocessing unit 105, for adjust adjust circuit 107, with increase driving circuit 106 output driving signal it is upper
It rises edge and establishes duration.
Circuit 107 is adjusted, for reducing shutdown duration of the IGBT module 104 each time from amplification region to cut-off region.
In the present embodiment, electromagnetic heating circuit 100 can increase adjusting between driving circuit 106 and IGBT module 104
Circuit 107, the adjusting circuit 107 can increase the drive of the output of driving circuit 106 under the adjustment effect of microprocessing unit 105
The rising edge of dynamic signal establishes duration, so that driving signal becomes not precipitous, can guarantee IGBT module 104 each time in this way
Duration in amplification region be less than or equal to preset duration under the premise of, extend IGBT module 104 each time in amplification region when
It is long, to increase the electric discharge duration of filter circuit 102 so that the drain voltage of IGBT module 104 reduces, at the same also reduction or
Noise caused by the IGBT module 104 in amplification region is eliminated, the loss of IGBT module 104 is reduced.
Further, IGBT module 104 is increased under the adjustment effect of microprocessing unit 105 due to adjusting circuit 107
It is in the duration of amplification region each time, therefore, when IGBT module 104 has little time shutdown, easily leads to the saturation of IGBT module 104 and leads
It is logical, in this way, adjusting circuit 107 also needs to reduce the shutdown duration from amplification region to cut-off region each time of IGBT module 104, thus
The turn-off speed for ensuring IGBT module 104 avoids 104 saturation conduction of IGBT module.
IGBT module 104 is reduced from amplification region to cut-off region in addition to itself having it should be noted that adjusting circuit 107
The effect for turning off duration, can also be under the adjustment effect of microprocessing unit 105, to reduce IGBT module 104 from amplification region
To the shutdown duration of cut-off region.
In the following, the specific structure for adjusting circuit 107 in electromagnetic heating circuit 100 is described in detail in conjunction with Fig. 4.Fig. 4
For the circuit diagram of electromagnetic heating circuit provided by the utility model, as shown in figure 4, the electromagnetic heating circuit of the present embodiment
100 on the basis of Fig. 3, and optionally, adjusting circuit 107 includes: adjustable resistance 1071 and discharge module 1072.
Wherein, the grid of IGBT module 104 respectively with the first end of adjustable resistance 1071 and discharge module 1072 first
End connection, the output end of driving circuit 106 connect with the second end of adjustable resistance 1071 and the second end of discharge module 1072 respectively
It connects, the control terminal of microprocessing unit 105 is connect with the adjustable side of adjustable resistance 1071.
Microprocessing unit 105 establishes duration for increasing the resistance value of adjustable resistance 1071 to increase rising edge.
Discharge module 1072, for reducing shutdown duration of the IGBT module 104 each time from amplification region to cut-off region.
In the present embodiment, microprocessing unit 105 can be by the resistance value of adjusting adjustable resistance 1071, to adjust driving circuit
The rising edge of the driving signal of 106 outputs establishes duration.In general, the resistance value of adjustable resistance 1071 is bigger, rising edge establishes duration
It is longer, and guarantee that the duration in amplification region is not more than preset duration to IGBT module 104 each time, in this way, IGBT module 104
Just will not saturation conduction and generate biggish noise.
Further, since there are input filter capacitors between the grid and drain electrode of IGBT module 104, when conducting IGBT mould
It needs to charge to filter capacitor when block 104, so that filter capacitor voltage reaches the cut-in voltage of IGBT module 104；Work as shutdown
It needs to discharge to input filter capacitor when IGBT module 104, so that filter capacitor voltage drops to the unlatching electricity of IGBT module 104
Pressure.It therefore, can in order to guarantee that IGBT module 104 is reliable and shutdown in time, adjusting circuit 107 pass through setting discharge module 1072
To reduce shutdown duration of the IGBT module 104 each time from amplification region to cut-off region, IGBT module 104 is avoided to lead into saturation
Logical state increases adjustable resistance 1071 to rear, IGBT module to ensure that between IGBT module 104 and driving circuit 106
104 turn-off speed is constant.
Wherein, discharge module 1072 can be diode, or triode etc., the present embodiment does not limit this.
When discharge module 1072 is diode, diode is connected in parallel with adjustable resistance 1071, and the anode and IGBT mould of diode
The grid of block 104 connects, and the cathode of diode is connect with the output end of driving circuit 106.Wherein, for ease of description, Fig. 4
In with discharge module 1072 be diode illustrated.
Secondly, being carried out to the specific structure of microprocessing unit 105 in electromagnetic heating circuit 100 detailed in conjunction with Fig. 4 and Fig. 5-6
It describes in detail bright.Fig. 5 is the circuit diagram of electromagnetic heating circuit provided by the utility model, and Fig. 6 is electricity provided by the utility model
The circuit diagram of magnetic heater circuit, as shown in Fig. 4 and Fig. 5-6, the electromagnetic heating circuit 100 of the present embodiment is on the basis of Fig. 3
On, optionally, microprocessing unit 105 includes: that zero cross detection circuit 1051, sync detection circuit 1052 and pulse protocol occur
Device (Programme Pulse Generator, PPG) 1053.
In a kind of achievable connection type of microprocessing unit 105, as shown in figure 4, optionally, wherein zero passage inspection
The first input end of slowdown monitoring circuit 1051 inputs predeterminated voltage, and the second input terminal of zero cross detection circuit 1051 is electric with synchronous detection
The first input end on road 1052 connects, the first input end of sync detection circuit 1052 and the first output end of filter circuit 102
Connection, the second input terminal of sync detection circuit 1052 are connect with the output end of resonance circuit 103, zero cross detection circuit 1051
The output end of output end and sync detection circuit 1052 is connect with the input terminal of PPG1053, the output end of PPG1053 and driving
The input terminal of circuit 106 connects.
In the achievable connection type of another kind of microprocessing unit 105, as shown in figure 5, optionally, zero passage detection electricity
The first input end on road 1051 inputs predeterminated voltage, the second input terminal and sync detection circuit 1052 of zero cross detection circuit 1051
First input end respectively with the first output end of filter circuit 102, the second input terminal and resonance of sync detection circuit 1052
The output end of circuit 103 connects, the output end of the output end of zero cross detection circuit 1051 and sync detection circuit 1052 with
The input terminal of PPG1053 connects, and the output end of PPG1053 is connect with the input terminal of driving circuit 106.
In above two connection type, PPG1053, for sending inspection pot probe signal to sync detection circuit 1052.
In above two connection type, sync detection circuit 1052, for obtaining default time according to inspection pot probe signal
Several and resonance circuit 103 resonance times；Judge whether resonance times are less than or equal to preset times, obtains synchronous judging result；
And synchronous judging result is sent to PPG1053.
In above two connection type, zero cross detection circuit 1051, for obtaining predeterminated voltage and filter circuit 102
Both end voltage；Judge whether both end voltage is less than or equal to predeterminated voltage, zero judging result is obtained；And it is transmitted across to PPG1053
Zero judging result.
In above two connection type, PPG1053 is also used to according to synchronous judging result and zero passage judging result, really
Directed driven circuit 106 is transmitted across zero probe signal or zero passage interrupt signal.
In the present embodiment, in above two connection type, as shown in Figure 4 and Figure 5, the connection of sync detection circuit 1052
Mode is identical, and the connection type of zero cross detection circuit 1051 is different.Wherein, since zero cross detection circuit 1051 is handed over for detecting
The zero crossing of galvanic electricity pressure, therefore, the first input end of zero cross detection circuit 1051 can input predeterminated voltage as benchmark electricity
Pressure, general predeterminated voltage is close to 0V or be in 0V, Fig. 4 and Fig. 5 with predeterminated voltage is that Vref is illustrated.That is micro process list
Member 105 can input predeterminated voltage or zero cross detection circuit 1051 to the first input end of zero cross detection circuit 1051
First input end can be directly grounded.Second input terminal of zero cross detection circuit 1051 can by direct or indirect mode with
First output end of filter circuit 102 connects.
Specifically, the second input terminal of zero cross detection circuit 1051 can directly with sync detection circuit 1052 first
Input terminal connection, is connect by the first input end of sync detection circuit 1052 with the first output end of filter circuit 102, can also be with
It is directly connect with the first output end of filter circuit 102, so that zero cross detection circuit 1051 can detecte the two of filter circuit 102
Whether end voltage is less than or equal to predeterminated voltage.
In addition, as shown in fig. 6, the second input terminal of zero cross detection circuit 1051 can also pass through first device such as divider resistance R
Part is connect with the first output end of filter circuit 102, to reduce the both end voltage of filter circuit 102, guarantees zero cross detection circuit
1051 will not cause the damage of zero cross detection circuit 1051 since the both end voltage of filter circuit 102 is excessive.
It will be understood by those skilled in the art that electromagnetic heating circuit 100 detects on electromagnetic heating utensil 10 whether have cookware
Mode include a variety of.One kind is feasible to be achieved in that, when there is no cookware on electromagnetic heating utensil 10, resonance circuit 103
The concussion time it is long, energy attenuation is slow, and the primary current for flowing through drum T1 in resonance circuit 103 is less, and T1 secondary voltage is with regard to low.
When having cookware on electromagnetic heating utensil 10, due to there is the addition of cookware, the concussion of resonance circuit 103, which damps, to be increased, and energy declines
Subtract fastly, the primary current for flowing through T1 in resonance circuit 103 is big, and T1 secondary voltage increases.Another kind is feasible to be achieved in that,
When not having cookware on electromagnetic heating utensil 10, the vibration time of resonance circuit 103 is long, and energy attenuation is slow, i.e., within the unit time,
The pulse number of signal is few.When having cookware on electromagnetic heating utensil 10, due to the addition of cookware, the concussion of resonance circuit 103
Damping increase, energy attenuation quickly, i.e., within the unit time, the pulse number of signal just than no cookware when it is more.
In the present embodiment, connection of the sync detection circuit 1052 by its output end and the input terminal of PPG1053, Ke Yijie
It receives PPG1053 and sends inspection pot probe signal (usually 5-8us).When sync detection circuit 1052 receives sync detection circuit
When 1052, sync detection circuit 1052 can be obtained by the connection of its first input end and the first output end of filter circuit 102
The signal on filter circuit 102 is taken, further according to the signal on filter circuit 102, obtains preset times.Sync detection circuit 1052
By the connection of its second input terminal and the output end of resonance circuit 103, signal on available resonance circuit 103, then root
According to the signal on resonance circuit 103, the resonance times of resonance circuit 103 are obtained.Then, sync detection circuit 1052 can pass through
Judge whether resonance times are less than or equal to preset times, obtains synchronous judging result, then synchronous judging result is sent to
PPG1053。
Wherein, when synchronous judging result is that resonance times are less than or equal to preset times, illustrate to detect electromagnetic heater
There is cookware on tool 10.When synchronous judging result is that resonance times are greater than preset times, illustrate to detect electromagnetic heating utensil 10
Upper no cookware.
It should be understood that sync detection circuit 1052 can also pass through the signal and resonance circuit on filter circuit 102
Signal on 103 obtains the primary current or secondary voltage of 103 coil of resonance circuit, to detect on electromagnetic heating utensil 10
Whether cookware is had.
Further, zero cross detection circuit 1051 can obtain predeterminated voltage by input predeterminated voltage.Zero passage detection electricity
Road 1051 by the directly or indirectly connection with the first output end of filter circuit 102 of its second input terminal, can be filtered again
The both end voltage of wave circuit 102.Then, zero cross detection circuit 1051 can be by judging it is pre- whether both end voltage is less than or equal to
If voltage, zero judging result is obtained, then zero passage judging result is sent to PPG1053.
Wherein, when zero passage judging result is that both end voltage is less than or equal to predeterminated voltage, illustrate alternating voltage by zero passage
Point.When zero passage judging result is that both end voltage is greater than predeterminated voltage, illustrate that alternating voltage does not pass through zero crossing.
Further, PPG1053 can be determined according to synchronous judging result and zero passage judging result to driving circuit 106
It is transmitted across zero probe signal or zero passage interrupt signal.
Specifically, when synchronous judging result is that resonance times are less than or equal to preset times and zero passage judging result is both ends electricity
When pressure is greater than predeterminated voltage, illustrate to detect have cookware on electromagnetic heating utensil 10, but alternating voltage does not pass through zero crossing, because
This, PPG1053, which can be determined to driving circuit 106, is transmitted across zero probe signal.
When synchronous judging result is that resonance times are less than or equal to preset times and zero passage judging result is that both end voltage is less than
When equal to predeterminated voltage, illustrate to detect have cookware on electromagnetic heating utensil 10, and alternating voltage passes through zero crossing, therefore,
PPG1053 can be transmitted across zero interrupt signal to driving circuit 106.
When synchronous judging result is that resonance times are greater than preset times, illustrate to detect do not have on electromagnetic heating utensil 10
There is cookware, therefore, PPG1053 does not need to be transmitted across zero probe signal and zero passage interrupt signal to driving circuit 106.
Wherein, zero cross detection circuit 1051 includes but is not limited to use zero-crossing comparator, and sync detection circuit 1052 includes
But it is not limited to using sync comparator.And the present embodiment to the concrete type of PPG1053 without limitation.
Again, continuing with Fig. 4 or Fig. 5-Fig. 6, the specific knot that the electromagnetic heating circuit 100 of the present embodiment may include
Structure is described in detail.Optionally, electromagnetic heating circuit 100 further include: the first bleeder circuit 1081 and the second bleeder circuit
1082。
Wherein, the first bleeder circuit 1081 and the second bleeder circuit 1082 are the identical circuit of parameter.First bleeder circuit
1081 input terminal is connect with the first output end of filter circuit 102, the input terminal and resonance circuit of the second bleeder circuit 1082
103 output end connection, the output end of the first bleeder circuit 1081 are connect with the first input end of microprocessing unit 105, and second
The output end of bleeder circuit 1082 is connect with the second input terminal of microprocessing unit 105.
First bleeder circuit 1081, for reducing the both end voltage of filter circuit 102.
Second bleeder circuit 1082, for reducing the tie point between resonance circuit 103 and the drain electrode of IGBT module 104
Voltage.
In the present embodiment, since the amplitude of the DC voltage generated by rectification circuit 101 is larger, filter circuit 102
The amplitude of the signal of signal and resonance circuit 103 is also larger, and therefore, the electromagnetic heating circuit 100 of the present embodiment can be in Wei Chu
Reason unit 105, which is separately connected on filter circuit 102 and the corresponding channel of resonance circuit 103, to be respectively set with parameter phase
Same the first bleeder circuit 1081 and the second bleeder circuit 1082, allows the first bleeder circuit 1081 to reduce filter circuit
102 both end voltage, the second bleeder circuit 1082 can reduce the company between resonance circuit 103 and the drain electrode of IGBT module 104
The voltage of contact, and the voltage swing that the first bleeder circuit 1081 and the second bleeder circuit 1082 respectively reduce is identical, not only protects
The service life for having demonstrate,proved each component in microprocessing unit 105 also allows microprocessing unit 105 to obtain reduction identical big
The signal on signal and resonance circuit 103 on small filter circuit 102, to guarantee that microprocessing unit 105 detects electromagnetic heating
Whether have whether the both end voltage of cookware and filter circuit 102 is less than or equal to the accuracy of predeterminated voltage on utensil 10.Wherein,
One bleeder circuit 1081 and the second bleeder circuit 1082 can include but is not limited to multiple divider resistances.For ease of description, scheme
The first bleeder circuit 1081 and the second bleeder circuit 1082 are illustrated by taking two groups of identical resistance as an example respectively in 4-Fig. 6.
Further, continuing with Fig. 4 or Fig. 5-Fig. 6, optionally, electromagnetic heating circuit 100 further include: preventing jittering circuit
1083.Wherein, the first end of preventing jittering circuit 1083 is connected to the output end and micro process list of the first bleeder circuit 1081
Between the first input end of member 105, the second end of preventing jittering circuit 1083 is connected to the output of the second bleeder circuit 1082
Between end and the second input terminal of microprocessing unit 105.
In the present embodiment, respectively corresponded to since microprocessing unit 105 is separately connected filter circuit 102 and resonance circuit 103
Channel on signal amplitude it is larger, therefore, the electromagnetic heating circuit 100 of the present embodiment can be arranged between the two channels
Preventing jittering circuit 1083, preventing jittering circuit 1083 have the shake for removing signal in each channel, it is ensured that microprocessing unit 105
The standard for whether thering is the both end voltage of cookware and filter circuit 102 whether to be less than or equal to predeterminated voltage on detection electromagnetic heating utensil 10
True property.Wherein, preventing jittering circuit 1083 can be integrated chip, or the circuit of component composition, such as filter capacitor group
At preventing jittering circuit 1083, the present embodiment does not limit this.Wherein, for ease of description, stabilization electricity in Fig. 4-Fig. 6
Road 1083 is that capacitor C is illustrated.
Again, continuing with Fig. 4 or Fig. 5-Fig. 6, optionally, resonance circuit 103 includes: heating coil and resonant capacitance.
Wherein, heating coil, resonance electricity are connected in series between the first output end of filter circuit 102 and the drain electrode of IGBT module 104
Hold the both ends for being connected in parallel on heating coil.Optionally, the magnetic material of heating coil is ferrite, iron silicon or iron sial.
Then, in the present embodiment, filter circuit 102 includes a variety of ways of realization, and need to only meet filter circuit 102 has storage
It can effect.Continuing with Fig. 4 or Fig. 5-Fig. 6, in a kind of specific implementation form of filter circuit 102, optionally, filtered electrical
Road 102 includes: filter inductance and filter capacitor.
Wherein, the input terminal of the positive output end of rectification circuit 101 and filter inductance connect, the first end of filter capacitor and
Second end is connected in parallel between the output end of filter inductance and the negative sense output end of rectification circuit 101, and the first end of filter capacitor is also
It is connect respectively with the first input end of the input terminal of resonance circuit 103 and microprocessing unit 105.
In the present embodiment, filter inductance and filter capacitor play the role of filtering, when IGBT module 104 does not turn on, by
It is connected in parallel in filter capacitor and finishing circuit, therefore, filter capacitor voltage can synchronize variation with the variation of alternating voltage.
Wherein, the number and numerical value of filter inductance and filter capacitor can be selected according to the actual situation.
It should be understood that filter circuit 102, in addition to above-mentioned form, filter circuit 102 can also only include filter capacitor.
Fig. 7 (a) signal after rectification circuit for the mains supply in electromagnetic heating circuit provided by the utility model
Waveform diagram, Fig. 7 (b) are signal on filter capacitor in the filter circuit in electromagnetic heating circuit provided by the utility model
Waveform diagram, Fig. 7 (c) are that the waveform of signal on the output end of the PPG in electromagnetic heating circuit provided by the utility model shows
It is intended to, Fig. 7 (d) is the waveform of signal on the output end of the zero cross detection circuit in electromagnetic heating circuit provided by the utility model
Schematic diagram.Continuing with Fig. 4 or Fig. 5-Fig. 6, for ease of description, mains supply is in the present embodiment with the single-phase of 220V, 50HZ
For sinusoidal voltage, as shown in Fig. 7 (a), Fig. 7 (b), Fig. 7 (c) and Fig. 7 (d), Fig. 7 (a), Fig. 7 (b), Fig. 7 (c) and Fig. 7
(d) abscissa in is time t, and unit ms, ordinate is respectively voltage U1-U4, unit V.Fig. 7 (a) is mains supply
The waveform of signal after rectification circuit 101, Fig. 7 (b) are the waveform of signal on filter capacitor in filter circuit 102, Fig. 7 (c)
For the waveform of signal on the output end of PPG1053, Fig. 7 (d) is the waveform of signal on the output end of zero cross detection circuit 1051.
In a specific embodiment, it is using the specific implementation process that the electromagnetic heating circuit of the present embodiment is started to work:
1, PPG1053 issues inspection pot probe signal to sync detection circuit 1052, and sync detection circuit 1052 detects resonance
Whether the resonance times of resonant inductance and resonant capacitance in circuit 103 have cookware on electromagnetic heating utensil 10 to detect.
2, when sync detection circuit 1052 detects that resonance times are less than or equal to preset times, electromagnetic heating utensil is determined
There is cookware on 10.At this point, sync detection circuit 1052 sends synchronous judging result to PPG1053.PPG1053 is receiving synchronization
Judging result and when not receiving zero passage judging result, can be transmitted across zero probe signal to driving circuit 106, such as Fig. 7 (c).
3, zero passage probe signal is by meeting after the amplification of driving circuit 106 so that IGBT module 104 is in amplification region.Due to
Time is short, and IGBT module 104 has little time to be saturated, so when noise it is lighter, although the work of IGBT module 104 at this time in amplification region,
But electric current is still had between the drain electrode and source electrode of IGBT module 104 to flow through, since filter circuit 102 is in parallel with mains supply,
Therefore, filter circuit 102 can be to the resonant inductance and resonance capacitor charging in resonance circuit 103, in this way, filter circuit 102
Both end voltage can be reduced as mains supply is synchronous, such as Fig. 7 (b).When mains supply passes through zero crossing, zero cross detection circuit
1051 detect the both end voltage of filter circuit 102 close to 0V, at this point, the meeting of zero cross detection circuit 1051 PPG1053 is transmitted across zero
Judging result, such as Fig. 7 (d), and then PPG1053 is transmitted across zero interrupt signal to driving circuit 106, such as Fig. 7 (c)
4, zero passage interrupt signal by meeting after the amplification of driving circuit 106 so that IGBT module 104 is in saturation region so that
IGBT module 104 first time passing zero trigger, at this point, electromagnetic heating circuit 100 starts normal heating.
Fig. 8 is the structural schematic diagram of electromagnetic heating utensil 10 provided by the utility model, as shown in figure 8, the present embodiment
Electromagnetic heating utensil 10 includes: electromagnetic heating circuit 100 as described above.
Electromagnetic heating utensil provided in this embodiment includes electromagnetic heating circuit as described above, and above-mentioned implementation can be performed
Example implements principle and technical effect, reference can be made to above-mentioned Fig. 2-Fig. 7 (a), Fig. 7 (b), Fig. 7 (c) and Fig. 7 (d) embodiment
Technical solution, details are not described herein again for the present embodiment.
Fig. 9 is the flow chart of zero passage detection method provided by the utility model, as shown in figure 9, the zero passage of the present embodiment is examined
Survey method is applied to the electromagnetic heating circuit 100 as shown in Fig. 2-Fig. 7 (a), Fig. 7 (b), Fig. 7 (c) and Fig. 7 (d).The present embodiment
Zero passage detection method may include:
S901, when having cookware on detecting electromagnetic heating utensil, be transmitted across zero probe signal；Zero passage probe signal is used for
Driving circuit driving IGBT module is in amplification region, and IGBT module is arranged and is in the duration of amplification region each time less than or equal to pre-
If duration.
S902, determine that the both end voltage of filter circuit is less than or equal to default electricity after being transmitted across zero probe signal and for the first time
When pressure, stopping is transmitted across zero probe signal, and starts to be transmitted across zero interrupt signal；The pulse number of zero passage interrupt signal was less than
The pulse number of zero probe signal, zero passage interrupt signal is in saturation region for driving circuit driving IGBT module, so that IGBT
Module first time passing zero trigger.
Zero passage detection method provided in this embodiment, can be performed the embodiment of electromagnetic heating circuit described above, specific
Implementing principle and technical effect, reference can be made to the technical solution of above-mentioned embodiment illustrated in fig. 2, details are not described herein again.
Figure 10 is the flow chart of zero passage detection method provided by the utility model, as shown in Figure 10, to S901 in Fig. 9
Detailed process is described in detail.May include: in the zero passage detection method of the present embodiment
S1001, inspection pot probe signal is sent；It examines pot probe signal and obtains preset times and resonance for sync detection circuit
The resonance times of circuit.
S1002, synchronous judging result and zero passage judging result are received；Synchronous judging result judges humorous for sync detection circuit
Whether shake frequency number is less than or equal to what preset times obtained, and zero passage judging result is that zero cross detection circuit obtains predeterminated voltage and filtering
The both end voltage of circuit simultaneously judges whether both end voltage is less than or equal to what predeterminated voltage obtained.
S1003, when synchronizing, judging result is resonance times less than or equal to preset times and zero passage judging result is both ends electricity
When pressure is greater than predeterminated voltage, determination is transmitted across zero probe signal.
Zero passage detection method provided in this embodiment, can be performed the embodiment of electromagnetic heating circuit described above, specific
Implementing principle and technical effect, reference can be made to the skill of above-mentioned Fig. 2-Fig. 7 (a), Fig. 7 (b), Fig. 7 (c) and Fig. 7 (d) illustrated embodiment
Art scheme, details are not described herein again.
Figure 11 is the flow chart of zero passage detection method provided by the utility model, as shown in figure 11, to S902 in Fig. 9
Detailed process is described in detail.May include: in the zero passage detection method of the present embodiment
S1101, inspection pot probe signal is sent；It examines pot probe signal and obtains preset times and resonance for sync detection circuit
The resonance times of circuit.
S1102, synchronous judging result and zero passage judging result are received；Synchronous judging result judges humorous for sync detection circuit
Whether shake frequency number is less than or equal to what preset times obtained, and zero passage judging result is that zero cross detection circuit obtains predeterminated voltage and filtering
The both end voltage of circuit simultaneously judges whether both end voltage is less than or equal to what predeterminated voltage obtained.
S1103, when synchronizing, judging result is resonance times less than or equal to preset times and zero passage judging result is both ends electricity
When pressure is less than or equal to predeterminated voltage, determination is transmitted across zero interrupt signal.
Zero passage detection method provided in this embodiment, can be performed the embodiment of electromagnetic heating circuit described above, specific
Implementing principle and technical effect, reference can be made to the skill of above-mentioned Fig. 2-Fig. 7 (a), Fig. 7 (b), Fig. 7 (c) and Fig. 7 (d) illustrated embodiment
Art scheme, details are not described herein again.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type.
Claims (10)
1. a kind of electromagnetic heating circuit (100) characterized by comprising rectification circuit (101), filter circuit (102), resonance
Circuit (103), insulated gate bipolar transistor IGBT module (104), microprocessing unit (105) and driving circuit (106)；
Wherein, the rectification circuit (101) is for rectifying the line voltage of input, and the rectification circuit (101) is just
It is connect to output end with the first input end of the filter circuit (102), the first output end difference of the filter circuit (102)
It is connect with the first input end of the input terminal of the resonance circuit (103) and the microprocessing unit (105), the resonance circuit
(103) output end connects with the second input terminal of the drain electrode of the IGBT module (104) and the microprocessing unit (105) respectively
It connects, the negative sense output end of the rectification circuit (101) is connect with the second input terminal of the filter circuit (102), the filtering
The second output terminal of circuit (102) and the source grounding of the IGBT module (104), the microprocessing unit (105) it is defeated
Outlet is connect with the input terminal of the driving circuit (106), the grid and the driving circuit of the IGBT module (104)
(106) output end connection.
2. electromagnetic heating circuit (100) according to claim 1, which is characterized in that the electromagnetic heating circuit (100) is also
It include: to adjust circuit (107)；
Wherein, the adjustable side for adjusting circuit (107) is connect with the control terminal of the microprocessing unit (105), the adjusting
The first end of circuit (107) is connect with the grid of the IGBT module (104), the second end for adjusting circuit (107) and institute
State the output end connection of driving circuit (106).
3. electromagnetic heating circuit (100) according to claim 2, which is characterized in that the adjusting circuit (107) includes:
Adjustable resistance (1071) and discharge module (1072)；
Wherein, the grid of the IGBT module (104) respectively with the first end of the adjustable resistance (1071) and the electric discharge mould
The first end of block (1072) connects, the output end of the driving circuit (106) respectively with the adjustable resistance (1071) second
End is connected with the second end of the discharge module (1072), the control terminal of the microprocessing unit (105) and the adjustable resistance
(1071) adjustable side connection.
4. electromagnetic heating circuit (100) according to claim 1-3, which is characterized in that the microprocessing unit
It (105) include: zero cross detection circuit (1051), sync detection circuit (1052) and PPG programme pulse generator PPG (1053)；
Wherein, the first input end of the zero cross detection circuit (1051) inputs predeterminated voltage, the zero cross detection circuit
(1051) the second input terminal is connect with the first input end of the sync detection circuit (1052), the sync detection circuit
(1052) first input end is connect with the first output end of the filter circuit (102), the sync detection circuit (1052)
The second input terminal connect with the output end of the resonance circuit (103), the output end of the zero cross detection circuit (1051) and
The output end of the sync detection circuit (1052) is connect with the input terminal of the PPG (1053), the PPG (1053) it is defeated
Outlet is connect with the input terminal of the driving circuit (106).
5. electromagnetic heating circuit (100) according to claim 1-3, which is characterized in that the microprocessing unit
It (105) include: zero cross detection circuit (1051), sync detection circuit (1052) and PPG programme pulse generator PPG (1053)；
Wherein, the first input end of the zero cross detection circuit (1051) inputs predeterminated voltage, the zero cross detection circuit
(1051) first input end of the second input terminal and the sync detection circuit (1052) respectively with the filter circuit (102)
The first output end, the output end of the second input terminal of the sync detection circuit (1052) and the resonance circuit (103) connects
Connect, the output end of the output end of the zero cross detection circuit (1051) and the sync detection circuit (1052) with the PPG
(1053) input terminal connection, the output end of the PPG (1053) are connect with the input terminal of the driving circuit (106).
6. electromagnetic heating circuit (100) according to claim 1-3, which is characterized in that the electromagnetic heating electricity
Road (100) further includes；First bleeder circuit (1081) and the second bleeder circuit (1082)；
Wherein, first bleeder circuit (1081) and second bleeder circuit (1082) are the identical circuit of parameter；It is described
The input terminal of first bleeder circuit (1081) is connect with the first output end of the filter circuit (102), the second partial pressure electricity
The input terminal on road (1082) is connect with the output end of the resonance circuit (103), the output of first bleeder circuit (1081)
End connect with the first input end of the microprocessing unit (105), the output end of second bleeder circuit (1082) with it is described
Second input terminal of microprocessing unit (105) connects.
7. electromagnetic heating circuit (100) according to claim 6, which is characterized in that the electromagnetic heating circuit (100) is also
Including；Preventing jittering circuit (1083)；
Wherein, the first end of the preventing jittering circuit (1083) is connected to the output end of first bleeder circuit (1081)
Between the first input end of the microprocessing unit (105), the second end of the preventing jittering circuit (1083) is connected to
Between the output end of second bleeder circuit (1082) and the second input terminal of the microprocessing unit (105).
8. electromagnetic heating circuit (100) according to claim 1, which is characterized in that the resonance circuit (103) includes:
Heating coil and resonant capacitance；
Wherein, it is connected in series between the first output end of filter circuit (102) and the drain electrode of the IGBT module (104) described
Heating coil, the resonant capacitance are connected in parallel on the both ends of the heating coil.
9. electromagnetic heating circuit (100) according to claim 1, which is characterized in that the filter circuit (102) includes:
Filter inductance and filter capacitor；
Wherein, the positive output end of the rectification circuit (101) is connect with the input terminal of the filter inductance, the filter capacitor
First end and second end be connected in parallel on the filter inductance output end and the rectification circuit (101) negative sense output end it
Between, the first end of the filter capacitor also respectively with the input terminal of the resonance circuit (103) and the microprocessing unit (105)
First input end connection.
10. a kind of electromagnetic heating utensil (10) characterized by comprising such as the described in any item electromagnetic heatings of claim 1-9
Circuit (100).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821195949.1U CN208754576U (en) | 2018-07-26 | 2018-07-26 | Electromagnetic heating circuit and electromagnetic heating appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821195949.1U CN208754576U (en) | 2018-07-26 | 2018-07-26 | Electromagnetic heating circuit and electromagnetic heating appliance |
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| Publication Number | Publication Date |
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| CN208754576U true CN208754576U (en) | 2019-04-16 |
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ID=66057797
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| CN201821195949.1U Active CN208754576U (en) | 2018-07-26 | 2018-07-26 | Electromagnetic heating circuit and electromagnetic heating appliance |
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| Country | Link |
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| CN (1) | CN208754576U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110972344A (en) * | 2019-09-16 | 2020-04-07 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic heating circuit, electromagnetic heating appliance and protection method of electromagnetic heating circuit |
| CN111567899A (en) * | 2020-04-07 | 2020-08-25 | 深圳麦时科技有限公司 | Electronic atomization device, use state detection method and device and readable storage medium |
-
2018
- 2018-07-26 CN CN201821195949.1U patent/CN208754576U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110972344A (en) * | 2019-09-16 | 2020-04-07 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic heating circuit, electromagnetic heating appliance and protection method of electromagnetic heating circuit |
| CN110972344B (en) * | 2019-09-16 | 2022-02-11 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic heating circuit, electromagnetic heating appliance and protection method of electromagnetic heating circuit |
| CN111567899A (en) * | 2020-04-07 | 2020-08-25 | 深圳麦时科技有限公司 | Electronic atomization device, use state detection method and device and readable storage medium |
| JP2023519622A (en) * | 2020-04-07 | 2023-05-11 | 深▲せん▼麦時科技有限公司 | ELECTRONIC ATOMIZER, USAGE DETECTION METHOD, APPARATUS AND READABLE STORAGE MEDIUM |
| JP7427806B2 (en) | 2020-04-07 | 2024-02-05 | 深▲せん▼麦時科技有限公司 | Electronic atomization device, usage state detection method, device, and readable storage medium |
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