CN107404779A - Electromagnetic Heating cooking system and its heating control apparatus - Google Patents
Electromagnetic Heating cooking system and its heating control apparatus Download PDFInfo
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- CN107404779A CN107404779A CN201610338701.5A CN201610338701A CN107404779A CN 107404779 A CN107404779 A CN 107404779A CN 201610338701 A CN201610338701 A CN 201610338701A CN 107404779 A CN107404779 A CN 107404779A
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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 invention discloses a kind of Electromagnetic Heating cooking system and its heating control apparatus, including：Resonance heating unit；For the power supply unit of resonance heating unit power supply；The power switch pipe being connected with resonance heating unit；To the driver element of driving power switching tube break-make；Differentiation element, it is connected with the colelctor electrode of power switch pipe, the voltage of the colelctor electrode for detecting power switch pipe, and carries out differential process to the collector voltage of power switch pipe to generate differential signal；Comparing unit, it is connected with differentiation element, and generates the lowest point detection signal according to differential signal；Control unit, it is connected respectively with comparing unit and driver element, and output opens control signal to driver element when judging that the voltage of colelctor electrode of power switch pipe is in trough according to the lowest point detection signal, with open-minded by driver element driving power switching tube, so as to ensure switching tube in collector voltage minimum point it is open-minded, the turn-on consumption of switching tube is effectively reduced, avoids energy waste.
Description
Technical field
The present invention relates to family's electro-technical field, more particularly to a kind of heating control apparatus of Electromagnetic Heating cooking system and a kind of tool
There is the Electromagnetic Heating cooking system of the heating control apparatus.
Background technology
Electromagnetic Heating cooking system in correlation technique typically controls power switch pipe to open or turn off by drive circuit, with
Realize Electromagnetic Heating control function.It is open-minded in drive circuit driving power switching tube but correlation technique has the drawback that
Or be not accurately controlled during shut-off, so as to ensure that power switch pipe is open-minded in collector voltage minimum point, and then
It may cause that the turning-on voltage of power switch pipe is too high, and turn-on consumption is big, cause energy waste, the service life of product shortens,
When serious even can breakdown power switching tube, potential safety hazard be present.
Therefore, the control technology of the Electromagnetic Heating cooking system in correlation technique needs to be improved.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.Therefore, one of the present invention
Purpose is to propose a kind of heating control apparatus of Electromagnetic Heating cooking system, and the circuit can accurately detect power switch pipe
Collector voltage minimum point, with ensure power switch pipe in collector voltage minimum point it is open-minded.
It is another object of the present invention to propose a kind of Electromagnetic Heating cooking system.
To reach above-mentioned purpose, a kind of heating control apparatus for Electromagnetic Heating cooking system that one aspect of the present invention embodiment proposes,
Including：Resonance heating unit；Power supply unit, said supply unit are connected with one end of the resonance heating unit, think institute
State the power supply of resonance heating unit；Power switch pipe, the colelctor electrode of the power switch pipe are another with the resonance heating unit
End is connected；Driver element, the driver element are connected with the gate pole of the power switch pipe, and the driver element is driving
The power switch pipe is switched on or off；Differentiation element, the differentiation element are connected with the colelctor electrode of the power switch pipe,
The differentiation element is used for the voltage for detecting the colelctor electrode of the power switch pipe, and to the colelctor electrode of the power switch pipe
Voltage carries out differential process to generate differential signal；Comparing unit, the comparing unit is connected with the differentiation element, described
Comparing unit generates the lowest point detection signal according to the differential signal；Control unit, described control unit respectively with the comparison
Unit is connected with the driver element, and described control unit is judging the current collection of power switch pipe according to the lowest point detection signal
Output opens control signal to the driver element when voltage of pole is in trough, to drive the work(by the driver element
Rate switching tube carries out open-minded.
The heating control apparatus of the Electromagnetic Heating cooking system proposed according to embodiments of the present invention, power is detected by differentiation element
The voltage of the colelctor electrode of switching tube, and differential process is carried out to generate differential signal to the collector voltage of power switch pipe, than
The lowest point detection signal is generated according to differential signal compared with unit, control unit judges the collection of power switch pipe according to the lowest point detection signal
Output opens control signal to driver element when the voltage of electrode is in trough, to be entered by driver element driving power switching tube
Row is open-minded, thereby may be ensured that power switch pipe is open-minded in collector voltage minimum point, effectively reduces opening for power switch pipe
Logical loss, avoids energy waste, and extends the service life of power switch pipe, ensures that Electromagnetic Heating cooking system is safe and reliable
Operation.
According to one embodiment of present invention, the differentiation element includes：First bleeder circuit, first bleeder circuit
Input is connected with the colelctor electrode of the power switch pipe, and first bleeder circuit detects the colelctor electrode of the power switch pipe
Voltage to generate the first voltage division signal；Differential circuit, the input of the differential circuit are defeated with first bleeder circuit
Go out end to be connected, the output end of the differential circuit is connected with the comparing unit, and the differential circuit is used for described first point
Pressure signal carries out differential process to generate differential signal.
According to the specific embodiment of the present invention, the differential circuit can be passive differential circuit, the passive differential circuit
Including：First electric capacity, one end of first electric capacity are connected with the output end of first bleeder circuit；First resistor, institute
The one end for stating first resistor is connected with the other end of first electric capacity, the other end ground connection of the first resistor, and described first
There is first node, the first node is connected with the comparing unit between electric capacity and the first resistor.
According to another specific embodiment of the present invention, the differential circuit can also be active differentiator.
According to one embodiment of present invention, first bleeder circuit includes second resistance and 3rd resistor, second electricity
One end of resistance is connected with the colelctor electrode of the power switch pipe, one end of the 3rd resistor and the other end of the second resistance
It is connected, the other end ground connection of the 3rd resistor, there is section point, institute between the 3rd resistor and the second resistance
Section point is stated with the differential circuit to be connected.
According to one embodiment of present invention, the differentiation element also includes：Signal processing circuit, the signal processing circuit
It is connected between the output end of the differential circuit and the comparing unit, the signal processing circuit is used to believe the differential
Number handled, so that the comparing unit generates the lowest point detection signal according to the differential signal after processing.
According to one embodiment of present invention, the signal processing circuit includes：4th resistance, one end of the 4th resistance
It is connected with the output end of the differential circuit；First comparator, the negative input end of the first comparator and the 4th resistance
The other end be connected, the positive input terminal of first comparator ground connection, the output end of the first comparator with described compared with singly
Member is connected；5th resistance, one end of the 5th resistance are connected with the negative input end of the first comparator, the 5th electricity
The other end of resistance is connected with the output end of the first comparator.
According to one embodiment of present invention, the comparing unit includes：Reference voltage provides circuit；Second comparator, institute
The negative input end for stating the second comparator is connected with the differentiation element, and the positive input terminal of second comparator is with described with reference to electricity
Pressure provides circuit and is connected, and the output end of second comparator is connected with described control unit.
According to the specific embodiment of the present invention, the reference voltage, which provides circuit, to be included：6th resistance, the 6th electricity
One end of resistance is connected with one end of the resonance heating unit；7th resistance, one end of the 7th resistance and the described 6th electricity
The other end of resistance is connected, the other end of the 7th resistance ground connection, has the between the 7th resistance and the 6th resistance
Three nodes, the 3rd node are connected with the positive input terminal of second comparator.
According to another specific embodiment of the present invention, the reference voltage, which provides circuit, to be included：8th resistance, the described 8th
One end of resistance is connected with default power supply；9th resistance, one end of the 9th resistance and the other end phase of the 8th resistance
Even, the other end ground connection of the 9th resistance, has fourth node between the 9th resistance and the 8th resistance, described
Fourth node is connected with the positive input terminal of second comparator.
According to another specific embodiment of the present invention, said supply unit is connected with AC power, by the AC power
The alternating current of offer is converted to direct current and thinks the resonance heating unit power supply, and the reference voltage, which provides circuit, to be included：It is whole
Flow module, the input of the rectification module are connected with the AC power；Tenth resistance, one end of the tenth resistance with
The output end of the rectification module is connected；11st resistance, one end of the 11st resistance are another with the tenth resistance
End is connected, and the other end ground connection of the 11st resistance, has Section five between the 11st resistance and the tenth resistance
Point, the 5th node are connected with the positive input terminal of second comparator.
To reach above-mentioned purpose, a kind of Electromagnetic Heating cooking system that another aspect of the present invention embodiment proposes, including it is described
The heating control apparatus of Electromagnetic Heating cooking system.
The Electromagnetic Heating cooking system proposed according to embodiments of the present invention, passes through above-mentioned heating control apparatus, it is ensured that work(
Rate switching tube is open-minded in collector voltage minimum point, effectively reduces the turn-on consumption of power switch pipe, avoids energy waste,
And extend the service life of power switch pipe, ensure Electromagnetic Heating cooking system safe and reliable operation.
Brief description of the drawings
Fig. 1 is the block diagram of the heating control apparatus of Electromagnetic Heating cooking system according to embodiments of the present invention；
Fig. 2 is the circuit theory diagrams of the heating control apparatus of Electromagnetic Heating cooking system according to an embodiment of the invention, its
In, reference voltage is the partial pressure of the voltage at the out1 ends of resonance heating unit 1；
Fig. 3 is the waveform diagram of the heating control apparatus of Electromagnetic Heating cooking system according to an embodiment of the invention；
Fig. 4 is the circuit diagram of the heating control apparatus of Electromagnetic Heating cooking system in accordance with another embodiment of the present invention, wherein,
Reference voltage be commercial power rectification after voltage partial pressure；And
Fig. 5 be according to the circuit diagram of the heating control apparatus of the Electromagnetic Heating cooking system of another of the invention embodiment, wherein,
Reference voltage is predeterminated voltage VCC partial pressure.
Reference：
Resonance heating unit 1, power supply unit 2, power switch pipe 3, driver element 4, differentiation element 5, comparing unit 6,
Control unit 7, resonance coil L0 and resonant capacitance C0；
Rectifier bridge 21, filtration module 22, the first diode D1 to the 4th diode D4, filter inductance L20 and filter capacitor
C20；
First bleeder circuit 51, differential circuit 52, the first electric capacity C1, first resistor R1, second resistance R2,3rd resistor
R3, signal processing circuit 53, the 4th resistance R4, first comparator U1, the 5th resistance R5 and predeterminated voltage VCC；
Reference voltage provides circuit 61, the second comparator U2, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the
Nine resistance R9, rectification module 60, the tenth resistance R10 and the 11st resistance R11.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein identical from beginning to end
Or similar label represents same or similar element or the element with same or like function.Retouched below with reference to accompanying drawing
The embodiment stated is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings come describe the embodiment of the present invention proposition Electromagnetic Heating cooking system and its heating control apparatus.
Fig. 1 is the block diagram of the heating control apparatus of the Electromagnetic Heating cooking system proposed according to embodiments of the present invention.Such as
Shown in Fig. 1, the heating control apparatus of the Electromagnetic Heating cooking system includes：Resonance heating unit 1, power supply unit 2, power
Switching tube 3, driver element 4, differentiation element 5, comparing unit 6 and control unit 7.
Wherein, power supply unit 2 is connected with one end out1 of resonance heating unit 1, thinks that resonance heating unit 1 is powered；Work(
The colelctor electrode C of rate switching tube 3 is connected with the other end out2 of resonance heating unit 1；Driver element 4 and power switch pipe 3
Gate pole G be connected, driver element 4 is switched on or off to driving power switching tube 3；Differentiation element 5 and power switch
The colelctor electrode C of pipe 3 is connected, and differentiation element 5 is used for the voltage V for detecting the colelctor electrode C of power switch pipe 3, and to power
The colelctor electrode C of switching tube 3 voltage V carries out differential process to generate differential signal；Comparing unit 6 and the phase of differentiation element 5
Even, comparing unit 6 generates the lowest point detection signal according to differential signal；Control unit 7 is single with comparing unit 6 and driving respectively
Member 4 is connected, and control unit 7 is in ripple in the voltage V that the colelctor electrode C of power switch pipe 3 is judged according to the lowest point detection signal
Output opens control signal to driver element 4 during paddy, open-minded to be carried out by the driving power switching tube 3 of driver element 4.
Specifically, as shown in figure 1, resonance heating unit 1 may include the resonance coil L0 and resonant capacitance C0 of parallel connection.
Specifically, power switch pipe 3 can be that IGBT manages (Insulated Gate Bipolar Transistor, insulated gate
Bipolar transistor) or metal-oxide-semiconductor (Metal-Oxide-Semiconductor Field-Effect Transistor, golden oxygen
Half field effect transistor).
Specifically, as shown in Fig. 2, Fig. 4 and Fig. 5, power supply unit 2 is connected with AC power AC, and power supply unit 2 wraps
Rectifier bridge 21 and filtration module 22 are included, wherein, rectifier bridge 21 includes the first diode D1 for being connected in a manner of full-bridge to the
Four diode D4, filtration module 22 include filter inductance L20 and filter capacitor C20.When resonance heating unit 1 works,
The AC power AC alternating currents provided are converted to direct current and think that resonance heating unit 1 is powered by power supply unit 2, driver element
The 4 control signal such as high level driving power switching tubes 3 of opening sent according to control unit 7 are opened and according to control unit 7
The shut-off control signal sent such as low level driving power switching tube 3 turns off, and adds so that resonance heating unit 1 carries out resonance
Heat.
In the specific example of the present invention, as shown in figure 3, the colelctor electrode C of power switch pipe 3 voltage can be according to song
Line M changes, and differentiation element 5 is believed the colelctor electrode C of the power switch pipe 3 voltage V differential generated after differential process
Number voltage can change according to curve N, wherein, curve M waveform is damped oscillation waveform, and A points are power switch pipe 3
Colelctor electrode C voltage V crest, B points for power switch pipe 3 colelctor electrode C voltage V trough.According to differential
Principle and curve N are understood, when the colelctor electrode C of power switch pipe 3 voltage V is in crest, trough or zero crossing,
The voltage of differential signal is zero.
So, comparing unit 6 generates the lowest point detection signal when the voltage of differential signal is zero, now control unit 7
Judge that the colelctor electrode C of power switch pipe 3 voltage V is in trough according to the lowest point detection signal such as rising edge or trailing edge,
Judge that the colelctor electrode C of power switch pipe 3 voltage V is in minimum point, control unit 7 is exportable to open control signal
Carried out to driver element 4 with driving power switching tube 3 open-minded.
Thus, it is possible to ensure that power switch pipe is open-minded in collector voltage minimum point, the open-minded of power switch pipe is effectively reduced
Loss.
According to one embodiment of present invention, as shown in Fig. 2, Fig. 4 and Fig. 5, differentiation element 5 includes：First bleeder circuit
51 and differential circuit 52.
Wherein, the input of the first bleeder circuit 51 is connected with the colelctor electrode C of power switch pipe 3, the first bleeder circuit 51
The colelctor electrode C of power switch pipe 3 voltage V is detected to generate the first voltage division signal；The input of differential circuit 52 and first
The output end of bleeder circuit 51 is connected, and the output end of differential circuit 52 is connected with comparing unit 6, differential circuit 52 be used for pair
First voltage division signal carries out differential process to generate differential signal.
According to the specific embodiment of the present invention, differential circuit 52 can be passive differential circuit, and passive differential circuit includes：
First electric capacity C1 and first resistor R1.Wherein, the first electric capacity C1 one end is connected with the output end of the first bleeder circuit 51；
First resistor R1 one end is connected with the first electric capacity C1 other end, first resistor R1 other end ground connection, the first electric capacity
There is first node, first node is connected with comparing unit 6 between C1 and first resistor R1.
According to another specific embodiment of the present invention, differential circuit 52 can also be active differentiator.
According to one embodiment of present invention, as shown in Fig. 2, Fig. 4 and Fig. 5, the first bleeder circuit 51 includes second resistance
R2 and 3rd resistor R3, wherein, second resistance R2 one end is connected with the colelctor electrode C of power switch pipe 3,3rd resistor
R3 one end is connected with the second resistance R2 other end, 3rd resistor R3 other end ground connection, 3rd resistor R3 and second
There is section point, section point is connected with differential circuit 52 between resistance R2.
Specifically, the first bleeder circuit 51 carries out partial pressure to the colelctor electrode C of power switch pipe 3 voltage V, to generate first
Voltage division signal, wherein, the magnitude of voltage of the first voltage division signal is V*R3/ (R3+R4).Also, differential circuit 52 is to first point
Signal is pressed to carry out differential process to generate differential signal, the differential signal can be delivered directly to comparing unit 6, so as to compare
Unit 6 generates the lowest point detection signal when the voltage of differential signal is zero.
According to one embodiment of present invention, as shown in Fig. 2 differentiation element 5 can also include：Signal processing circuit 53,
Wherein, signal processing circuit 53 is connected between the output end of differential circuit 52 and comparing unit 6, signal processing circuit 53
For handling differential signal, so that comparing unit 6 generates the lowest point detection signal according to the differential signal after processing.
As shown in Fig. 2 signal processing circuit 53 includes：4th resistance R4, first comparator U1 and the 5th resistance R5.Its
In, the 4th resistance R4 one end is connected with the output end of differential circuit 52；First comparator U1 negative input end and the 4th electricity
The resistance R4 other end is connected, first comparator U1 positive input terminal ground connection, first comparator U1 output end and comparing unit
6 are connected；5th resistance R5 one end is connected with first comparator U1 negative input end, the 5th resistance R5 other end and
One comparator U1 output end is connected.
Specifically, the differential signal that differential circuit 52 generates passes through the 4th resistance R4 and first comparator U1 negative input end phase
Even, first comparator U1 positive input terminal ground connection, so, signal processing circuit 53 carries out anti-phase and upper to the differential signal
Processing is drawn to generate the i.e. anti-phase differential signal of WeChat ID after processing, and anti-phase differential signal is transported to comparing unit 6, with
Comparing unit 6 is set to generate the lowest point detection signal when the voltage of anti-phase differential signal is zero.
So, when the colelctor electrode C of power switch pipe 3 voltage V is in the colelctor electrode C's of crest A and power switch pipe 3
When voltage V is in trough B, the voltage of differential signal or anti-phase differential signal is zero, comparing unit 6 in differential signal or
The lowest point detection signal is generated when the voltage of the anti-phase differential signal of person is zero.
According to one embodiment of present invention, as shown in Fig. 2 comparing unit 6 includes：Reference voltage provides circuit 61 and the
Two comparator U2, wherein, the second comparator U2 negative input end is connected with differentiation element 5, and the second comparator U2's is just defeated
Enter end with reference voltage offer circuit 61 to be connected, the second comparator U2 output end is connected with control unit 7.
Specifically, reference voltage provides circuit 61 and is used to provide reference voltage, the second comparator U2 to the second comparator U2
Differential signal and reference voltage can be contrasted, when the colelctor electrode C of power switch pipe 3 voltage V is in trough, the
Two comparator U2 export rising edge or trailing edge, the rising edge or trailing edge that control unit 7 exports according to the second comparator U2
It can determine whether the colelctor electrode C of power switch pipe 3 voltage V is in trough i.e. minimum point, and judging power switch
When the colelctor electrode C of pipe 3 voltage V is in trough, output opens control signal to driver element 300, with single by driving
First 300 driving power switching tubes 200 are open-minded.More specifically, reference voltage can be arranged to no-voltage, as shown in figure 3,
By taking differential signal as an example, before trough B, the colelctor electrode C of power switch pipe 3 voltage V is in decline state, differential
The voltage of signal is negative, the second comparator U2 output high level, and after trough B, the colelctor electrode C of power switch pipe 3
Voltage V be in propradation, differential signal is just, the second comparator U2 output low levels, control unit 7 then can basis
Trailing edge judges that the colelctor electrode C of power switch pipe 3 voltage V is in trough.
Again by taking reverse differential signal as an example, before trough B, the colelctor electrode C of power switch pipe 3 voltage V, which is in, to be declined
State, the voltage of reverse differential signal is just the second comparator U2 output low levels, and after trough B, power switch
The colelctor electrode C of pipe 3 voltage V is in propradation, and reverse differential signal is negative, the second comparator U2 output high level,
Control unit 7 can then judge that the colelctor electrode C of power switch pipe 3 voltage V is in trough according to rising edge.
According to Fig. 2 example, reference voltage, which provides circuit 61, to be included：6th resistance R6 and the 7th resistance R7.Wherein,
Six resistance R6 one end is connected with one end out1 of resonance heating unit 1；7th resistance R7 one end and the 6th resistance R6
The other end be connected, the 7th resistance R7 other end ground connection, there is the 3rd node between the 7th resistance R7 and the 6th resistance R6,
3rd node is connected with the second comparator U2 positive input terminal.
Specifically, as shown in Fig. 2 reference voltage offer circuit 61 enters to one end out1 of resonance heating unit 1 voltage
Row partial pressure sayed with to provide reference voltage, one end out1 of the 6th resistance R6 and the 7th resistance R7 to resonance heating unit 1
Voltage carry out partial pressure to generate the second voltage division signal, wherein, can pass through adjust the 6th resistance R6 and the 7th resistance R7 electricity
Resistance, it is almost equal to zero so that the voltage of the second voltage division signal is reference voltage, second voltage division signal is transported into second compares
Device U2 positive input terminal, after the second comparator U2 negative input end receives differential signal or the processing of the output of differentiation element 5
Differential signal, the second comparator U2 is by the differential signal after differential signal or processing compared with the second voltage division signal.
When the voltage of differential signal after differential signal or processing is zero, comparing unit 6 generate the lowest point detection signal such as rising edge or
Person's trailing edge, control unit 7 judge that the colelctor electrode C of power switch pipe 3 voltage is in trough according to the lowest point detection signal,
Now control unit 7 output open control signal carried out to driver element 4 with driving power switching tube 3 it is open-minded.
It is understood that the differential signal after differential signal or processing and the second voltage division signal are out1's by comparing unit 6
Voltage division signal is compared, it is ensured that at civil power zero crossing, control unit 7 still may determine that power switch pipe 3
Colelctor electrode C voltage V whether be in trough, so as to which effectively control power switch pipe 3 is operated in whole civil power envelope
Quasi-resonance state, improve the utilization rate of civil power.
According to Fig. 4 example, reference voltage, which provides circuit 61, to be included：8th resistance R8 and the 9th resistance R9.Wherein,
Eight resistance R8 one end is connected with default power supply VCC；9th resistance R9 one end is connected with the 8th resistance R8 other end,
9th resistance R9 other end ground connection, has a fourth node between the 9th resistance R9 and the 8th resistance R8, fourth node and the
Two comparator U2 positive input terminal is connected.
Specifically, as shown in figure 4, reference voltage provides circuit 61 carries out partial pressure to provide reference voltage to default power supply VCC,
Saying, the 8th resistance R8 and the 9th resistance R9 carry out partial pressure to generate the 3rd voltage division signal to default power supply VCC, wherein,
Can be by adjusting the 8th resistance R8 and the 9th resistance R9 resistance value so that the voltage of the 3rd voltage division signal is that reference voltage is intimate
It is zero, the 3rd voltage division signal is transported to the second comparator U2 positive input terminal, the second comparator U2 negative input termination
Receive differentiation element 5 output differential signal, the second comparator U2 by differential signal compared with the 3rd voltage division signal,
When the voltage of differential signal after differential signal or processing is zero, comparing unit 6 generate the lowest point detection signal such as rising edge or
Person's trailing edge, control unit 7 judge that the colelctor electrode C of power switch pipe 3 voltage V is in trough according to the lowest point detection signal,
The now output of control unit 7 opens control signal to driver element 4, to be entered by the driving power switching tube 3 of driver element 4
Row is open-minded.
According to Fig. 5 example, reference voltage, which provides circuit 61, to be included：Rectification module 60, the electricity of the tenth resistance R10 and the 11st
Hinder R11.Wherein, the input of rectification module 60 is connected with AC power AC；Tenth resistance R10 one end and rectification mould
The output end of block 60 is connected；11st resistance R11 one end is connected with the tenth resistance R10 other end, the 11st resistance
R11 other end ground connection, has the 5th node, the 5th node and second between the 11st resistance R11 and the tenth resistance R10
Comparator U2 positive input terminal is connected.
Specifically, as shown in figure 5, reference voltage provides circuit 61 carries out partial pressure to provide reference to the electric main after rectification
Voltage, that is, say, the tenth resistance R10 and the 11st resistance R11 carry out partial pressure to generate the 4th point to the electric main after rectification
Signal is pressed, can be by adjustment the tenth resistance R10 and the 11st resistance R11 resistance value, so that the voltage of the 4th voltage division signal
I.e. reference voltage is almost equal to zero, and the 4th voltage division signal is transported to the second comparator U2 positive input terminal, the second comparator
U2 negative input end receives the differential signal of the output of differentiation element 5, and the second comparator U2 is by differential signal and the 4th partial pressure
Signal is compared, and when the voltage of the differential signal after differential signal or processing is zero, comparing unit 6 generates the lowest point detection
Signal such as rising edge or trailing edge, control unit 7 judge the colelctor electrode C of power switch pipe 3 according to the lowest point detection signal
Voltage V be in trough, now control unit 7 output open control signal to driver element 4, to pass through driver element 4
Driving power switching tube 3 carries out open-minded.
Specifically, as shown in Fig. 2, Fig. 4 and Fig. 5, reference voltage provides circuit 61 can be to the out1 of resonance heating unit 1
The voltage at end carries out partial pressure, can also carry out partial pressure to the alternating current after rectification, can also carry out partial pressure to predeterminated voltage.
It should be noted that the partial pressure that reference voltage provides circuit 61 can be adjusted, to control power switch pipe in colelctor electrode C
Voltage V minimum points it is advanced nearby or hysteresis is open-minded, by taking Fig. 2 as an example, can pass through and change the 6th resistance R6 and the 7th resistance
R7 resistance value come adjust reference voltage provide circuit 61 partial pressure.
As described above, the specific work process of the heating control apparatus of the embodiment of the present invention is as follows：
When resonance heating unit 1 works, differentiation element 5 detects the colelctor electrode C of power switch pipe 3 voltage V to generate
Differential signal, specifically, when the colelctor electrode C of power switch pipe 3 voltage V is in crest, trough or zero crossing,
The voltage for the differential signal that differentiation element 5 generates is zero, and differential signal is transported to the second comparator U2 negative input end.Together
When, the second comparator U2 positive input terminal and reference voltage provide circuit 61 and are connected, and reference voltage provides circuit 61 and provides ginseng
Voltage is examined, the voltage of differential signal and reference voltage are compared by the second comparator U2, after differential signal or processing is judged
The voltage of differential signal when being zero, comparing unit 6 generates the lowest point detection signal such as rising edge or trailing edge signal, control
Unit 7 processed is in trough, this time control according to the voltage V that the lowest point detection signal is the colelctor electrode C that can determine whether power switch pipe 3
The output of unit 7 processed opens control signal to driver element 4, open-minded to be carried out by the driving power switching tube 3 of driver element 4.
To sum up, the heating control apparatus of the Electromagnetic Heating cooking system proposed according to embodiments of the present invention, is examined by differentiation element
The voltage of the colelctor electrode of power scale switching tube, and differential process is carried out to generate differential letter to the collector voltage of power switch pipe
Number, comparing unit generates the lowest point detection signal according to differential signal, and control unit judges power switch according to the lowest point detection signal
Output opens control signal to driver element when the voltage of the colelctor electrode of pipe is in trough, to be opened by driver element driving power
Close pipe and carry out open-minded, thereby may be ensured that power switch pipe is open-minded in collector voltage minimum point, effectively reduce power switch
The turn-on consumption of pipe, energy waste is avoided, and extend the service life of power switch pipe, ensure Electromagnetic Heating cooking system peace
Full reliability service.
The invention also provides a kind of Electromagnetic Heating cooking system.The Electromagnetic Heating cooking system includes the heating of above-described embodiment
Control device.Wherein, Electromagnetic Heating cooking system can be electromagnetic oven, electromagnetic stove, IH (Electromagnetic Heating) electric cookers or IH (electricity
Magnetic heats) the Electromagnetic Heating product such as pressure cooker.
To sum up, the Electromagnetic Heating cooking system proposed according to embodiments of the present invention, can be with by above-mentioned heating control apparatus
Ensure that power switch pipe is open-minded in collector voltage minimum point, effectively reduce the turn-on consumption of power switch pipe, avoid the energy
Waste, and extend the service life of power switch pipe, ensure Electromagnetic Heating cooking system safe and reliable operation.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ",
" width ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ",
" level ", " top ", " bottom " " interior ", " outer ", " clockwise ", " counterclockwise ", " axial direction ", " footpath
To ", the orientation of the instruction such as " circumference " or position relationship be based on orientation shown in the drawings or position relationship, merely to just
In the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation, with
Specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relatively important
Property or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be with
Express or implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two,
Such as two, three etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can be with
It is connection or the interaction relationship of two elements of two element internals, is limited unless otherwise clear and definite.For this area
For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can "above" or "below" second feature
To be that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, the
One feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or
Oblique upper, or be merely representative of fisrt feature level height and be higher than second feature.Fisrt feature second feature " under ",
" lower section " and " following " can be fisrt feature immediately below second feature or obliquely downward, or to be merely representative of first special
Sign level height is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " tool
The description of body example " or " some examples " etc. means to combine specific features, structure, material that the embodiment or example describe
Material or feature are contained at least one embodiment or example of the present invention.In this manual, to the signal of above-mentioned term
Property statement be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can combine in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting,
Those skilled in the art can be by the different embodiments or example described in this specification and the spy of different embodiments or example
Sign is combined and combined.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment be it is exemplary,
It is not considered as limiting the invention, one of ordinary skill in the art within the scope of the invention can be to above-described embodiment
It is changed, changes, replacing and modification.
Claims (12)
- A kind of 1. heating control apparatus of Electromagnetic Heating cooking system, it is characterised in that including：Resonance heating unit；Power supply unit, said supply unit are connected with one end of the resonance heating unit, think that the resonance heating unit supplies Electricity；Power switch pipe, the colelctor electrode of the power switch pipe are connected with the other end of the resonance heating unit；Driver element, the driver element are connected with the gate pole of the power switch pipe, and the driver element is described to drive Power switch pipe is switched on or off；Differentiation element, the differentiation element are connected with the colelctor electrode of the power switch pipe, and the differentiation element is used to detect institute The voltage of the colelctor electrode of power switch pipe is stated, and differential process is carried out to generate to the voltage of the colelctor electrode of the power switch pipe Differential signal；Comparing unit, the comparing unit are connected with the differentiation element, and the comparing unit generates according to the differential signal The lowest point detection signal；Control unit, described control unit are connected with the comparing unit and the driver element respectively, and described control unit exists Judge that output opens control signal to institute when the voltage of the colelctor electrode of power switch pipe is in trough according to the lowest point detection signal Driver element is stated, it is open-minded to drive the power switch pipe to carry out by the driver element.
- 2. the heating control apparatus of Electromagnetic Heating cooking system according to claim 1, it is characterised in that the differential Unit includes：First bleeder circuit, the input of first bleeder circuit are connected with the colelctor electrode of the power switch pipe, and described One bleeder circuit detects the voltage of the colelctor electrode of the power switch pipe to generate the first voltage division signal；Differential circuit, the input of the differential circuit are connected with the output end of first bleeder circuit, the differential circuit Output end be connected with the comparing unit, the differential circuit be used for first voltage division signal carry out differential process with life Into differential signal.
- 3. the heating control apparatus of Electromagnetic Heating cooking system according to claim 2, it is characterised in that the differential Circuit is passive differential circuit, and the passive differential circuit includes：First electric capacity, one end of first electric capacity are connected with the output end of first bleeder circuit；First resistor, one end of the first resistor are connected with the other end of first electric capacity, the first resistor it is another End ground connection, there is first node, the first node and the comparing unit between first electric capacity and the first resistor It is connected.
- 4. the heating control apparatus of Electromagnetic Heating cooking system according to claim 2, it is characterised in that the differential Circuit is active differentiator.
- 5. the heating control apparatus of Electromagnetic Heating cooking system according to claim 2, it is characterised in that described first Bleeder circuit includes second resistance and 3rd resistor, and one end of the second resistance is connected with the colelctor electrode of the power switch pipe, One end of the 3rd resistor is connected with the other end of the second resistance, the other end of 3rd resistor ground connection, and described the There is section point, the section point is connected with the differential circuit between three resistance and the second resistance.
- 6. the heating control apparatus of the Electromagnetic Heating cooking system according to any one of claim 2-5, it is characterised in that The differentiation element also includes：Signal processing circuit, the signal processing circuit are connected between the output end of the differential circuit and the comparing unit, The signal processing circuit is used to handle the differential signal, so that the comparing unit is believed according to the differential after processing Number generation the lowest point detection signal.
- 7. the heating control apparatus of Electromagnetic Heating cooking system according to claim 6, it is characterised in that the signal Process circuit includes：4th resistance, one end of the 4th resistance are connected with the output end of the differential circuit；First comparator, the negative input end of the first comparator are connected with the other end of the 4th resistance, first ratio Positive input terminal compared with device is grounded, and the output end of the first comparator is connected with the comparing unit；5th resistance, one end of the 5th resistance are connected with the negative input end of the first comparator, the 5th resistance The other end is connected with the output end of the first comparator.
- 8. the heating control apparatus of Electromagnetic Heating cooking system according to claim 1, it is characterised in that the comparison Unit includes：Reference voltage provides circuit；Second comparator, the negative input end of second comparator are connected with the differentiation element, and second comparator is just Input provides circuit with the reference voltage and is connected, and the output end of second comparator is connected with described control unit.
- 9. the heating control apparatus of Electromagnetic Heating cooking system according to claim 8, it is characterised in that the reference Circuit for providing voltage includes：6th resistance, one end of the 6th resistance are connected with one end of the resonance heating unit；7th resistance, one end of the 7th resistance are connected with the other end of the 6th resistance, the 7th resistance it is another End ground connection, has the 3rd node, the 3rd node is compared with described second between the 7th resistance and the 6th resistance The positive input terminal of device is connected.
- 10. the heating control apparatus of Electromagnetic Heating cooking system according to claim 8, it is characterised in that the ginseng Examining circuit for providing voltage includes：8th resistance, one end of the 8th resistance are connected with default power supply；9th resistance, one end of the 9th resistance are connected with the other end of the 8th resistance, the 9th resistance it is another End ground connection, has fourth node, the fourth node is compared with described second between the 9th resistance and the 8th resistance The positive input terminal of device is connected.
- 11. the heating control apparatus of Electromagnetic Heating cooking system according to claim 8, it is characterised in that the confession Electric unit is connected with AC power, and the alternating current that the AC power provides is converted into direct current thinks that the resonance heats Unit is powered, and the reference voltage, which provides circuit, to be included：Rectification module, the input of the rectification module are connected with the AC power；Tenth resistance, one end of the tenth resistance are connected with the output end of the rectification module；11st resistance, one end of the 11st resistance are connected with the other end of the tenth resistance, the 11st resistance Other end ground connection, there is the 5th node between the 11st resistance and the tenth resistance, the 5th node with it is described The positive input terminal of second comparator is connected.
- 12. a kind of Electromagnetic Heating cooking system, it is characterised in that including the electricity according to any one of claim 1-11 The heating control apparatus of magnetic heating cooking system.
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| CN201610338701.5A CN107404779B (en) | 2016-05-19 | 2016-05-19 | Electromagnetic heating cooking system and heating control device thereof |
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| CN201610338701.5A CN107404779B (en) | 2016-05-19 | 2016-05-19 | Electromagnetic heating cooking system and heating control device thereof |
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| CN110049588A (en) * | 2018-01-15 | 2019-07-23 | 佛山市顺德区美的电热电器制造有限公司 | Cookware detection method, device and the electromagnetic oven of electromagnetic oven |
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| CN107404779B (en) | 2020-09-18 |
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