CN106851881A - Electromagnetic heating system and its heating control apparatus - Google Patents
Electromagnetic heating system and its heating control apparatus Download PDFInfo
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- CN106851881A CN106851881A CN201510895322.1A CN201510895322A CN106851881A CN 106851881 A CN106851881 A CN 106851881A CN 201510895322 A CN201510895322 A CN 201510895322A CN 106851881 A CN106851881 A CN 106851881A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a kind of electromagnetic heating system and its heating control apparatus, device includes：Resonance circuit；Power supply circuit；Power switch pipe；Signal generating circuit, signal generating circuit is used to produce self-oscillatory starting of oscillation signal；Signal modulation circuit, signal modulation circuit is connected with signal generating circuit, and signal modulation circuit is used for according to starting of oscillation signal and reference signal output drive signal；Signal amplification circuit, control pole of the signal amplification circuit respectively with signal modulation circuit and power switch pipe is connected, and signal amplification circuit is switched on or off for amplifying drive signal with by the drive signal driving power switching tube after amplification；Synchronous feedback circuit, synchronous feedback circuit is connected with resonance circuit and signal generating circuit respectively, and synchronous feedback circuit is used to adjust starting of oscillation signal according to the resonant condition of resonance circuit.Thus, the device can build resonant tank by minimum control backfeed loop, and circuit structure is simple, and control process is simple, and the device is reliable and stable.
Description
Technical field
The present invention relates to living electric apparatus technical field, the heating control apparatus and one kind of more particularly to a kind of electromagnetic heating system
Electromagnetic heating system.
Background technology
Generally there is problems with the electromagnetic heating circuit in correlation technique：
One is, circuit control process complexity carries out current sample, it is necessary to first pass through software, then by amplifier to sampling electricity
Stream is amplified, and then carries out software inhouse invariable power calculating according to the sample rate current after amplification.But, correlation technique is adopted
The accuracy of current sample element is not high enough, and it is larger to frequently can lead to current sample deviation, and then causes invariable power to calculate
Result error is larger, it is impossible to which effective controlled output power, power deviation are larger.
The second is, circuit system is complicated, and correlation technique needs to carry out different signal samplings, and backfeed loop could complete master control
The basic structure in loop is built.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, one of the invention
Purpose is to propose a kind of heating control apparatus of electromagnetic heating system, and the device can be built by minimum control backfeed loop
Resonant tank, circuit design is simply ingenious.
It is another object of the present invention to propose a kind of electromagnetic heating system.
To reach above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of heating control apparatus of electromagnetic heating system, bag
Include：Resonance circuit；Power supply circuit, the power supply circuit is connected with the input of the resonance circuit, thinks the resonance electricity
Road powers；Power switch pipe, the colelctor electrode of the power switch pipe is connected with the output end of the resonance circuit, the power
The grounded emitter of switching tube；Signal generating circuit, the signal generating circuit is used to produce self-oscillatory starting of oscillation signal；
Signal modulation circuit, the signal modulation circuit is connected with the signal generating circuit, and the signal modulation circuit is used for basis
The starting of oscillation signal and reference signal output drive signal；Signal amplification circuit, the signal amplification circuit respectively with the letter
Number modulation circuit is connected with the control pole of the power switch pipe, the signal amplification circuit be used to amplifying the drive signal with
The power switch pipe is driven to be switched on or off by the drive signal after amplification；Synchronous feedback circuit, the synchronous feedback electricity
Road is connected with the resonance circuit and the signal generating circuit respectively, and the synchronous feedback circuit is used for according to resonance electricity
The resonant condition on road adjusts the starting of oscillation signal.
The heating control apparatus of electromagnetic heating system according to embodiments of the present invention, self-oscillation is produced by signal generating circuit
Starting of oscillation signal to control the resonance circuit to carry out resonance automatically, signal modulation circuit is exported further according to starting of oscillation signal and reference signal
To adjust the power output of resonance circuit, then synchronous feedback circuit is used to be adjusted according to the resonant condition of resonance circuit drive signal
Whole starting of oscillation signal is forming close loop negative feedback.Thus, the device can build resonant tank by minimum control backfeed loop,
Circuit structure is simple, and control process is simple, and the device is reliable and stable.
According to some embodiments of the invention, the signal generating circuit includes：First comparator, the electricity of the first comparator
Source is connected with default power supply, the ground terminal ground connection of the first comparator；First resistor, one end of the first resistor with it is pre-
If power supply is connected；Second resistance, one end of the second resistance is connected with the other end of the first resistor, second electricity
The other end of resistance is connected with the output end of the first comparator, has the 6th between the second resistance and the first resistor
Node, the 6th node is connected with the positive input terminal of the first comparator；First electric capacity, one end of first electric capacity
Negative input end with the first comparator is connected, the other end of first electric capacity ground connection, the first comparator it is negative defeated
Enter end to be connected with the signal modulation circuit as the output end of the signal generating circuit；3rd resistor, the 3rd resistor
One end be connected with one end of first electric capacity and the negative input end of the first comparator respectively；4th resistance, described
One end of four resistance is connected with the other end of the 3rd resistor, and the other end of the 4th resistance is connected with the default power supply；
First diode, the anode of first diode other end respectively with the 3rd resistor and one end of the 4th resistance
It is connected, the negative electrode of first diode is connected with the output end of the first comparator.
Wherein, when the first comparator exports high level signal, first electric capacity, the 3rd resistor and described the
Four resistance constitute charge circuit；When the first comparator export low level when, first electric capacity, the 3rd resistor and
First diode constitutes discharge loop.
According to some embodiments of the invention, the signal modulation circuit includes：Resonant switch, one end of the resonant switch with
Default power supply is connected；5th resistance, one end of the 5th resistance is connected with the other end of the resonant switch；6th resistance,
One end of 6th resistance is connected with the other end of the 5th resistance, the other end ground connection of the 6th resistance, wherein,
There is first node between 5th resistance and the 6th resistance；3rd diode, the anode of the 3rd diode with
One end of 5th resistance is connected with the other end of the resonant switch；7th resistance, one end of the 7th resistance and institute
The negative electrode for stating the 3rd diode is connected；8th resistance, one end of the 8th resistance is connected with the other end of the 7th resistance,
The other end ground connection of the 8th resistance, wherein, there is Section Point between the 8th resistance and the 7th resistance；The
One triode, the emitter stage of first triode is connected with the Section Point, the grounded collector of first triode,
The base stage of first triode is connected with the first node；9th resistance, one end and described second of the 9th resistance
Node is connected；4th diode, the 4th diode and the 9th resistor coupled in parallel；Electrochemical capacitor, the electrochemical capacitor
Positive pole be connected with the other end of the 9th resistance, the negative pole of electrochemical capacitor ground connection, wherein, the electrochemical capacitor with it is described
There is the 3rd node, the 3rd node is used to provide the reference signal between 9th resistance；Second comparator, described
The positive input terminal of two comparators is connected with the 3rd node, and the negative input end of second comparator is used as the signal modulation
The input of circuit is connected with the output end of the signal generating circuit, and the output end of second comparator is used as the signal
The output end of modulation circuit is connected with the signal amplification circuit, and the power end of second comparator is connected with default power supply,
The ground terminal ground connection of second comparator.
Wherein, when the resonant switch disconnects, the resonance circuit is in the state that is stopped；When the resonant switch is closed
During conjunction, the resonance circuit is in running order.
Wherein, when the resistance of the 8th resistance is fixed, the reference signal is negatively correlated with the resistance of the 7th resistance
Resistance of the power output of relation, the service time of the power switch pipe and the resonance circuit also with the 7th resistance be in
Negative correlativing relation.
Or, when the resistance of the 7th resistance is fixed, the reference signal is proportionate with the resistance of the 8th resistance
Resistance of the power output of relation, the service time of the power switch pipe and the resonance circuit with the 8th resistance be in
Positive correlation.
According to some embodiments of the invention, the synchronous feedback circuit includes：Tenth resistance, one end of the tenth resistance with
The input of the resonance circuit is connected；11st resistance, one end of the 11st resistance is another with the tenth resistance
End is connected, the other end ground connection of the 11st resistance, has Section four between the tenth resistance and the 11st resistance
Point；12nd resistance, one end of the 12nd resistance is connected with one end of the power switch pipe；13rd resistance, institute
The one end for stating the 13rd resistance is connected with the other end of the 12nd resistance, the other end ground connection of the 13rd resistance, institute
Stating has the 5th node between the 12nd resistance and the 13rd resistance；3rd comparator, the 3rd comparator it is just defeated
Enter end to be connected with the fourth node, the negative input end of the 3rd comparator is connected with the 5th node, the 3rd ratio
Output end compared with device is connected with the output end of the first comparator.
According to some embodiments of the invention, the signal amplification circuit is included by pushing away that the second triode and the 3rd triode are constituted
Draw circuit.
To reach above-mentioned purpose, another aspect of the present invention embodiment also proposed a kind of electromagnetic heating system, including described electricity
The heating control apparatus of magnetic heating system.
Electromagnetic heating system according to embodiments of the present invention, can build resonant tank, circuit by minimum control backfeed loop
Simple structure, control process is simple.
Brief description of the drawings
Fig. 1 is the block diagram of the heating control apparatus of electromagnetic heating system according to embodiments of the present invention；
Fig. 2 is the circuit theory diagrams of the heating control apparatus of electromagnetic heating system according to an embodiment of the invention；
Fig. 3 and Fig. 4 are the waveform diagrams of signal generating circuit according to an embodiment of the invention；And
Fig. 5 and Fig. 6 are the waveform diagrams of signal modulation circuit according to an embodiment of the invention.
Reference：
Resonance circuit 10, power supply circuit 20, power switch pipe 30, signal generating circuit 40, signal modulation circuit 50, letter
Number amplifying circuit 60 and synchronous feedback circuit 70；
Heating coil L1 and resonant capacitance C1；
First comparator U1, first resistor R1, second resistance R2, the first electric capacity C1,3rd resistor R3, the 4th resistance
R4, the first diode D1 and the second diode D2；
Resonant switch K1, the 5th resistance R5, the 6th resistance R6, the 3rd diode D3, the 7th resistance R6, the 8th resistance
R8, the first triode Q1, the 9th resistance R9, the 4th diode D4, electrochemical capacitor EC and the second comparator U2；
Second triode Q2 and the 3rd triode Q3.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein identical from start to finish
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 be not considered as limiting the invention.
Below with reference to the accompanying drawings come describe the embodiment of the present invention proposition electromagnetic heating system heating control apparatus and with this
The electromagnetic heating system of device.
Fig. 1 is the block diagram of the heating control apparatus of electromagnetic heating system according to embodiments of the present invention.As shown in figure 1,
The heating control apparatus include：Resonance circuit 10, power supply circuit 20, power switch pipe 30, signal generating circuit 40, letter
Number modulation circuit 50, signal amplification circuit 60 and synchronous feedback circuit 70.
Wherein, resonance circuit 10 may include heating coil L1 and resonant capacitance C1, heating coil L1 and resonant capacitance
C1 can be connected in parallel to constitute antiresonant circuit；Power supply circuit 20 is connected with the input of resonance circuit 10, thinks humorous
The circuit 10 that shakes is powered, and specifically, power supply circuit 20 can carry out rectification, filtering process to export direct current to outside alternating current
To resonance circuit 10；The colelctor electrode of power switch pipe 30 is connected with the output end of resonance circuit 10, power switch pipe 30
Grounded emitter.
Signal generating circuit 40 is used to produce self-oscillatory starting of oscillation signal；Signal modulation circuit 50 and signal generating circuit 40
It is connected, signal modulation circuit 50 is used for according to starting of oscillation signal and reference signal output drive signal；60 points of signal amplification circuit
Control pole not with signal modulation circuit 50 and power switch pipe 30 is connected, and signal amplification circuit 60 is used to amplify drive signal
It is switched on or off with by the drive signal driving power switching tube 30 after amplification；Synchronous feedback circuit 70 is electric with resonance respectively
Road 10 is connected with signal generating circuit 40, and synchronous feedback circuit 70 is used to be adjusted according to the resonant condition of resonance circuit 10
Shake signal.
Specifically, after heating control apparatus energization, signal generating circuit 40 is exportable according to rising that default rule changes
Shake signal, and then be compared with output drive signal for starting of oscillation signal and reference signal by signal modulation circuit 50, the drive signal
Frequency it is related to reference signal, afterwards, signal amplification circuit 60 can be according to the drive signal driving power switching tube after amplification
30 are switched on or off, and so can control the power output of resonance circuit 10 by controlling the service time of power switch pipe 30,
Service time is more long, and power output is bigger, conversely, service time is shorter, power output is smaller.In addition, synchronous feedback is electric
The resonant condition of Real-time Collection resonance circuit 10 is gone back on road 70, and adjusts starting of oscillation signal according to resonant condition, so as to form closed loop
Negative-feedback, makes starting of oscillation signal continue to change according to default rule, and then power output is kept stabilization.
Thus, the heating control apparatus of the electromagnetic heating system of the embodiment of the present invention, exciting is produced from by signal generating circuit
The starting of oscillation signal for swinging is to control the resonance circuit to carry out resonance automatically, and signal modulation circuit is defeated further according to starting of oscillation signal and reference signal
Go out drive signal to adjust the power output of resonance circuit, then synchronous feedback circuit is used for the resonant condition according to resonance circuit
Starting of oscillation signal is adjusted to form close loop negative feedback.So, the device can build resonant tank by minimum control backfeed loop,
Circuit structure is simple, and control process is simple, and the device is reliable and stable.
Describe circuit structure, the operation principle of the heating control apparatus of the embodiment of the present invention in detail with reference to Fig. 2-6.
According to one embodiment of present invention, as shown in Fig. 2 signal generating circuit 40 includes：First comparator U1,
One resistance R1, second resistance R2, the first electric capacity C1,3rd resistor R3, the 4th resistance R4 and the first diode D1.
Wherein, the power end of first comparator U1 is connected with default power supply VCC, the ground terminal ground connection of first comparator U1；
One end of first resistor R1 is connected with default power supply VCC；The other end phase of one end of second resistance R2 and first resistor R1
Even, the other end of second resistance R2 is connected with the output end of first comparator U1, second resistance R2 and first resistor R1
Between there is the 6th node, the 6th node is connected with the positive input terminal of first comparator U1；One end of first electric capacity C1 and the
The negative input end of one comparator U1 is connected, and the other end ground connection of the first electric capacity C1, the negative input end of first comparator U1 is made
For the output end of signal generating circuit 40 is connected with signal modulation circuit 50；One end of 3rd resistor R3 respectively with the first electric capacity
One end of C1 is connected with the negative input end of first comparator U1；One end of 4th resistance R4 and the other end of 3rd resistor R3
It is connected, the other end of the 4th resistance R4 is connected with default power supply VCC；The anode of the first diode D1 is electric with the 3rd respectively
One end of the other end and the 4th resistance R4 that hinder R3 is connected, and the negative electrode of the first diode D1 is defeated with first comparator U1
Go out end to be connected.
Further, heating control apparatus also include：Second diode D2, the anode of the second diode D2 compares with first
The output end of device U1 is connected, and the negative electrode of the second diode D2 is connected with default power supply VCC.
Wherein, when first comparator U1 exports high level signal, the first electric capacity C1,3rd resistor R3 and the 4th resistance
R4 constitutes charge circuit；When first comparator U1 exports low level, the first electric capacity C1,3rd resistor R3 and the one or two
Pole pipe D1 constitutes discharge loop.
The course of work of the signal generating circuit 40 of the embodiment of the present invention is as follows：
After heating control apparatus are powered, a1 lines are in 0-T1 in the voltage such as Fig. 3 of the positive input terminal A1 of first comparator U1
Shown in carving, i.e. A1 points are in high level, and the voltage of the negative input end B1 of first comparator U1 is less than first comparator U1's
The voltage of positive input terminal A1, the output end C1 output high level of first comparator U1, c1 lines are in 0-T1 in such as Fig. 4
Shown in carving.In the electric capacity charging stage, power supply VCC is preset by 3rd resistor R3 and the 4th resistance R4 to the first electric capacity C1
Charge, the negative input end B1 of first comparator U1 is that the voltage of one end of the first electric capacity C1 is constantly raised, and voltage waveform is such as
B1 lines are shown in the 0-T1 moment in Fig. 3.
At T1 moment, the positive input of the voltage higher than first comparator U1 of the negative input end B1 of first comparator U1
The voltage of A1, first comparator U1 upset output low level, as in Fig. 4 c1 lines at the T1-T2 moment shown in, when first ratio
When exporting low level compared with device U1, according to comparator characteristic, the output end C1 shorted to earths of first comparator U1, the first ratio
The voltage of the positive input A1 compared with device U1 is default power supply VCC by after first resistor R1 and second resistance R2 partial pressures
Branch pressure voltage, as in Fig. 3 a1 lines at the T1-T2 moment shown in, now A1 points voltage be V1 volts.Simultaneously as
The output end C shorted to earths of comparator U1, the first electric capacity C1 is put over the ground by 3rd resistor R3 and the first diode D1
Electricity, the voltage of the negative input end B1 of first comparator U1 is persistently reduced, as in Fig. 3 b1 lines at the T1-T2 moment shown in.
At the T2 moment, the first electric capacity C1 discharges over the ground causes the voltage of the negative input end B1 of first comparator U1 less than the
The voltage of the positive input terminal A1 of one comparator U1, first comparator U1 overturns output high level, first comparator again
The voltage of the output end C1 of U1 be high level, as in Fig. 4 c1 lines at the T2-T3 moment shown in.First comparator U1 is just
The voltage of input A1 is high level, as in Fig. 3 a1 lines at the T2-T3 moment shown in, preset power supply VCC and pass through the 3rd
Resistance R3 and the 4th resistance R4 charges to the first electric capacity C1, and the negative input end B1 of first comparator U1 is the first electric capacity
The voltage of one end of C1 is constantly raised, voltage waveform as in Fig. 3 b1 lines at the T2-T3 moment shown in.
So repeatedly, the negative input end B1 of first comparator U1 is that one end of the first electric capacity C1 is produced in Fig. 3 shown in b lines
Starting of oscillation signal.
According to one embodiment of present invention, as shown in Fig. 2 signal modulation circuit 50 includes：Resonant switch K1, the 5th
Resistance R5, the 6th resistance R6, the 3rd diode D3, the 7th resistance R6, the 8th resistance R8, the first triode Q1,
Nine resistance R9, the 4th diode D4, electrochemical capacitor EC and the second comparator U2.
Wherein, one end of resonant switch K1 is connected with default power supply VCC；One end of 5th resistance R5 and resonant switch K1
The other end be connected；One end of 6th resistance R6 is connected with the other end of the 5th resistance R5, the other end of the 6th resistance R6
Ground connection, wherein, there is first node between the 5th resistance R5 and the 6th resistance R6；The anode of the 3rd diode D3 and
One end of five resistance R5 is connected with the other end of resonant switch K1；One end of 7th resistance R7 is with the 3rd diode D3's
Negative electrode is connected；One end of 8th resistance R8 is connected with the other end of the 7th resistance R7, the other end ground connection of the 8th resistance R8,
Wherein, there is Section Point between the 8th resistance R8 and the 7th resistance R7；The emitter stage and second section of the first triode Q1
Point is connected, and the grounded collector of the first triode Q1, the base stage of the first triode Q1 is connected with first node, the one or three pole
Pipe Q1 can be PNP type triode；One end of 9th resistance R9 is connected with Section Point；The electricity of 4th diode D4 and the 9th
Resistance R9 is in parallel；The positive pole of electrochemical capacitor EC is connected with the other end of the 9th resistance R9, the negative pole ground connection of electrochemical capacitor EC,
Wherein, there is the 3rd node, the 3rd node is used to provide reference signal between electrochemical capacitor EC and the 9th resistance C9；Second
The positive input terminal of comparator U2 is connected with the 3rd node, and the negative input end of the second comparator U2 is used as signal modulation circuit 50
Input be connected with the output end of signal generating circuit 40, the output end of the second comparator U2 is used as signal modulation circuit 50
Output end be connected with signal amplification circuit 60, the power end of the second comparator U2 is connected with default power supply VCC, second
The ground terminal ground connection of comparator U2.
Wherein, resonant switch K1 is used to control resonance circuit 10 to be operated or be stopped.When resonant switch K1 disconnects
When, resonance circuit 10 is in the state that is stopped；When resonant switch K1 is closed, resonance circuit 10 is in running order.
The course of work of the signal modulation circuit 50 of the embodiment of the present invention is as follows：
After heating control apparatus are powered, resonant switch K1 is off, the positive input terminal A2's of the second comparator U2
Voltage is zero, the voltage of the voltage of the negative input end B2 of the second comparator U2 and the negative input end B1 of first comparator U1
It is identical, the voltage waveform of B2 points as shown in a2 in a1 in Fig. 3 and Fig. 5, the electricity of the negative input end B2 of the second comparator U2
Voltage of the pressure higher than its positive input terminal A2, the output end C2 output low levels of the second comparator U2, the not work of resonance circuit 10
Make.After resonant switch K1 is closed, the base voltage of the first triode Q1 is the 5th resistance R5 and the 6th resistance R6 pairs
The partial pressure of default power supply VCC, base stage is high level, and according to PNP type triode characteristic, the first triode Q1 is off
State, presets power supply VCC by resonant switch K1, the 3rd diode D3, the 7th resistance R7, and the 9th resistance R9 is to electricity
Solution electric capacity EC is charged, and the voltage of the positive input terminal B2 of the second comparator U2 is persistently raised and stabilization is in voltage V2, such as Fig. 5
Shown in middle b2 lines, voltage V2 is reference signal, and its magnitude of voltage is the 8th resistance R8 and the 7th resistance R7 to default electricity
The partial pressure of source VCC.Now the voltage of the negative input end B2 of the second comparator U2 is less than the positive input terminal of the second comparator U2
The voltage V2, the second comparator U2 of B2 output end C3 output high level, as in Fig. 5 c2 lines at the t0-t1 moment shown in.
Second comparator U2 exports high level, and the high level after the amplification of signal amplification circuit 60 by driving power switch pipe 30 to open
Logical, resonance circuit 10 is operated, and power supply circuit 20 is discharged over the ground by heating coil L1 and power switch pipe Q1.
And because the voltage of the negative input end B2 of the second comparator U2 is identical with the voltage of the negative input end B1 of first comparator U1,
The voltage of the negative input end B2 of the second comparator U2 persistently increases after powered up, as shown in a2 lines in Fig. 5, so when the
During the voltage V2 of positive input terminal B2 of the voltage of the negative input end B2 of two comparator U2 higher than the second comparator U2, second
Comparator U2 upset output low level, as in Fig. 5 c2 lines at the t1-t2 moment shown in.Second comparator U2 exports low level,
The low level is turned off by driving power switch pipe 30 after signal amplification circuit 60, the heating coil L1 in resonance circuit 10
Start vibration with resonant capacitance C1, in a harmonic period, complete heating coil L1 to the charging of resonant capacitance C1 with
And resonant capacitance C1 discharges heating coil L1.
Afterwards, the T1 moment in figure 3, the voltage of the negative input end B1 of first comparator U1 is higher than first comparator U1
Positive input A1 voltage, first comparator U1 upset output low level, the first electric capacity C1 pass through 3rd resistor R3
Discharged over the ground with the first diode D1, the voltage of the negative input end B1 of first comparator U1 is persistently reduced, therefore second compares
The voltage of the negative input end B2 of device U2 is also persistently reduced, as shown in figure 5, as the negative input end B2 of the second comparator U2
Voltage less than the second comparator U2 positive input terminal B2 voltage V2 when, the second comparator U2 upset output high level,
As in Fig. 5 c2 lines at the t2-t3 moment shown in.Second comparator U2 exports high level, and the high level is by signal amplification circuit
Driving power switch pipe 30 is open-minded after 60 amplifications, and resonance circuit 10 is operated, and power supply circuit 20 passes through heating coil L1
And power switch pipe Q1 discharges over the ground.And so on, the continuous firing of resonance circuit 10.
And during the continuous firing of resonance circuit 10, if control resonant switch K1 disconnects, the first triode Q1's
Base stage is low level, and according to PNP type triode characteristic, the first triode Q1 is open-minded, and electrochemical capacitor EC passes through the four or two
The emitter stage and colelctor electrode of pole pipe D4 and the first triode Q1 discharge over the ground, after electrochemical capacitor EC voltage drops are as low as zero, the
The positive input terminal A2 point voltages of two comparator U2 are zero, the negative input end B1 point voltages less than first comparator U1, the
Two comparator U2 export low level, and power switch pipe Q1 shut-offs, resonance circuit 10 is stopped.
It should be noted that when the resistance of the 8th resistance R8 is fixed, reference signal is in negative with the resistance of the 7th resistance R7
Pass relation, the service time of power switch pipe 30 and the power output of resonance circuit 10 are also in negative with the resistance of the 7th resistance R7
Dependency relation.
That is, the 7th resistance R7 can be adjustable resistance, and if the resistance of the 7th resistance R7 turned down, the 8th resistance
On R8, the 7th resistance R7 and the circuit of the 3rd diode D3 series connection, partial pressures of the 8th resistance R8 to default power supply VCC
Increase, presets charging voltage increases of the power supply VCC to electrochemical capacitor EC, as shown in a3 lines in Fig. 6, the second comparator
The voltage of the positive input terminal B2 of U2 can be stablized in voltage V3, wherein, voltage V3 is more than voltage V2 in Fig. 5.Due to electricity
Pressure V3 is more than voltage V2 in Fig. 5, so, c3 lines 0-t1.2 and t2.2-t3.2 times are more than c3 lines 0-t1 in Fig. 5 in Fig. 6
And the t2-t3 times, that is, say, turn the resistance of the 7th resistance R7, the service time increase of power switch pipe Q1, resonance electricity down
The power output increase on road 10, conversely, tuning up the resistance of the 7th resistance R7, the service time of power switch pipe Q1 reduces,
The power output of resonance circuit 10 reduces.
Or, when the resistance of the 7th resistance R7 is fixed, the resistance correlation of reference signal and the 8th resistance R8,
The service time of power switch pipe 30 and the power output of resonance circuit 10 are proportionate pass with the resistance of the 8th resistance R8
System.
Similarly, the 8th resistance R8 can be set to adjustable resistance, if the resistance of the 8th resistance R8 turned down, the 8th electricity
On resistance R8, the circuit of the 7th resistance R7 and the 3rd diode D3 series connection, the 8th resistance R8 divides default power supply VCC
Pressure reduces, and presets power supply VCC and the charging voltage of electrochemical capacitor EC is reduced, and the service time of power switch pipe Q1 reduces,
The power output of resonance circuit 10 reduces, conversely, the resistance of the 8th resistance R8 is tuned up, when opening of power switch pipe Q1
Between increase, the increase of the power output of resonance circuit 10.
According to one embodiment of present invention, as shown in Fig. 2 synchronous feedback circuit 70 includes：Tenth resistance R10, the tenth
One resistance R11, the 12nd resistance R12, the 13rd resistance R13 and the 3rd comparator U3.
Wherein, one end of the tenth resistance R10 is connected with the input of resonance circuit 10；One end of 11st resistance R11 with
The other end of the tenth resistance R10 is connected, the other end ground connection of the 11st resistance R11, the tenth resistance R10 and the 11st resistance
There is fourth node between R11；One end of 12nd resistance R12 is connected with one end of power switch pipe 30；13rd resistance
One end of R13 is connected with the other end of the 12nd resistance R12, the other end ground connection of the 13rd resistance R13, the 12nd resistance
There is the 5th node between R12 and the 13rd resistance R13；The positive input terminal of the 3rd comparator U3 is connected with fourth node,
The negative input end of the 3rd comparator U3 is connected with the 5th node, and the output end of the 3rd comparator U3 is with first comparator U1's
Output end is connected.
That is, one end of the tenth resistance R10 is connected with the dc bus end of power supply circuit 20, the tenth resistance R10's
The other end is connected with the positive input terminal of the 3rd comparator U3, to constitute the sampling of DC bus-bar voltage.12nd resistance R12
One end be connected with the colelctor electrode of power switch pipe 30, the other end of the 12nd resistance R12 is negative defeated with the 3rd comparator U3
Enter end connection, to constitute the colelctor electrode high-pressure sampling of power switch pipe 30.
In a harmonic period, the voltage at the two ends of resonance circuit 10 is electric by the synchronous feedback being made up of the 3rd comparator U3
Road 70, feeds back to the output end of first comparator U1 in signal generating circuit 40, to form close loop negative feedback.By negative anti-
Feedback, when the power output of resonance circuit 10 is higher than predetermined power by adjusting starting of oscillation signal, and then can adjust drive signal,
Turned down with by the power output of resonance circuit 10, and when the power output of resonance circuit 10 is less than predetermined power by adjustment
Starting of oscillation signal, drive signal, the power output of resonance circuit 10 is heightened.The output of resonance circuit 10 can thus be made
Power stability is in predetermined power.
According to one embodiment of present invention, as shown in Fig. 2 signal amplification circuit 60 is included by the second triode Q2 and the
The push-pull circuit that three triode Q3 are constituted.The particular circuit configurations of push-pull circuit as shown in Fig. 2 repeat no more here.
According to one embodiment of present invention, as shown in Fig. 2 power switch pipe 30 can manage (Insulated Gate for IGBT
Bipolar Transistor, insulated gate bipolar transistor), resonance circuit 10 may include the heating coil L1 and resonance of parallel connection
Electric capacity C1, wherein, the colelctor electrode of IGBT pipes is connected with the heating coil L1 and resonant capacitance C1 of parallel connection, IGBT pipes
Grounded emitter, the grid of IGBT pipes is connected with signal amplification circuit 60.
In sum, the heating control apparatus of electromagnetic heating system according to embodiments of the present invention, are produced by signal generating circuit
, to control the resonance circuit to carry out resonance automatically, signal modulation circuit is further according to starting of oscillation signal and base for the self-oscillatory starting of oscillation signal of life
To adjust the power output of resonance circuit, then synchronous feedback circuit is used for according to resonance circuit calibration signal output drive signal
Resonant condition adjusts starting of oscillation signal to form close loop negative feedback.Thus, the device can be built by minimum control backfeed loop
Resonant tank, circuit structure is simple, and control process is simple, and the device is reliable and stable.
Finally, the embodiment of the present invention also propose can a kind of electromagnetic heating system, including above-described embodiment electromagnetic heating system
Heating control apparatus.
Electromagnetic heating system according to embodiments of the present invention, can build resonant tank, circuit by minimum control backfeed loop
Simple structure, control process is simple.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ",
The orientation or position relationship of the instruction such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " are based on shown in the drawings
Orientation or position relationship, are for only for ease of the description present invention and simplify and describe, rather than indicate or imply signified device or
Element with specific orientation, with specific azimuth configuration and operation, therefore must be not considered as limiting the invention.
Additionally, term " first ", " second " be only used for describe purpose, and it is not intended that indicate or imply relative importance or
The implicit quantity for indicating indicated technical characteristic.Thus, " first " is defined, the feature of " second " can be expressed or hidden
Include at least one this feature containing ground.In the description of the invention, " multiple " is meant that at least two, such as two, three
It is individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the art such as term " installation ", " connected ", " connection ", " fixation "
Language should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integrally；Can be machinery
Connection, or electrical connection；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two units
Connection or two interaction relationships of element inside part, unless otherwise clearly restriction.For the ordinary skill of this area
For personnel, above-mentioned term concrete meaning in the present invention can be as the case may be understood.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be
First and second feature directly contacts, or the first and second features pass through intermediary mediate contact.And, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below "
Can be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second
Feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specific example ",
Or the description of " some examples " etc. means to combine specific features, structure, material or feature bag that the embodiment or example are described
It is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term necessarily
It is directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
Combined in an appropriate manner in individual or multiple embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Can be combined for the feature of the different embodiments or example described in this specification and different embodiments or example by art personnel
And combination.
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 (10)
1. a kind of heating control apparatus of electromagnetic heating system, it is characterised in that including：
Resonance circuit；
Power supply circuit, the power supply circuit is connected with the input of the resonance circuit, thinks that the resonance circuit is powered；
Power switch pipe, the colelctor electrode of the power switch pipe is connected with the output end of the resonance circuit, the power switch
The grounded emitter of pipe；
Signal generating circuit, the signal generating circuit is used to produce self-oscillatory starting of oscillation signal；
Signal modulation circuit, the signal modulation circuit is connected with the signal generating circuit, and the signal modulation circuit is used for
According to the starting of oscillation signal and reference signal output drive signal；
Signal amplification circuit, the signal amplification circuit respectively with the control of the signal modulation circuit and the power switch pipe
Extremely it is connected, the signal amplification circuit is used to amplify the drive signal with by the drive signal driving power after amplification
Switching tube is switched on or off；And
Synchronous feedback circuit, the synchronous feedback circuit is connected with the resonance circuit and the signal generating circuit respectively, institute
Synchronous feedback circuit is stated for adjusting the starting of oscillation signal according to the resonant condition of the resonance circuit.
2. heating control apparatus of electromagnetic heating system according to claim 1, it is characterised in that the signal occurs
Circuit includes：
First comparator, the power end of the first comparator is connected with default power supply, the ground terminal ground connection of the first comparator；
First resistor, one end of the first resistor is connected with default power supply；
Second resistance, one end of the second resistance is connected with the other end of the first resistor, the second resistance it is another
End is connected with the output end of the first comparator, has the 6th node, institute between the second resistance and the first resistor
The 6th node is stated to be connected with the positive input terminal of the first comparator；
First electric capacity, one end of first electric capacity is connected with the negative input end of the first comparator, first electric capacity
The other end is grounded, the negative input end of the first comparator as the signal generating circuit output end and the signal modulation
Circuit is connected；
3rd resistor, one end of the 3rd resistor is negative defeated with one end of first electric capacity and the first comparator respectively
Enter end to be connected；
4th resistance, one end of the 4th resistance is connected with the other end of the 3rd resistor, the 4th resistance it is another
End is connected with the default power supply；
First diode, the anode of first diode respectively with the other end of the 3rd resistor and the 4th resistance
One end is connected, and the negative electrode of first diode is connected with the output end of the first comparator.
3. heating control apparatus of electromagnetic heating system according to claim 2, it is characterised in that wherein,
When the first comparator exports high level signal, first electric capacity, the 3rd resistor and the 4th resistance
Constitute charge circuit；
When the first comparator exports low level, first electric capacity, the 3rd resistor and the first diode structure
Into discharge loop.
4. heating control apparatus of electromagnetic heating system according to claim 1, it is characterised in that the signal modulation
Circuit includes：
Resonant switch, one end of the resonant switch is connected with default power supply；
5th resistance, one end of the 5th resistance is connected with the other end of the resonant switch；
6th resistance, one end of the 6th resistance is connected with the other end of the 5th resistance, the 6th resistance it is another
End ground connection, wherein, there is first node between the 5th resistance and the 6th resistance；
3rd diode, anode and one end of the 5th resistance and the other end of the resonant switch of the 3rd diode
It is connected；
7th resistance, one end of the 7th resistance is connected with the negative electrode of the 3rd diode；
8th resistance, one end of the 8th resistance is connected with the other end of the 7th resistance, the 8th resistance it is another
End ground connection, wherein, there is Section Point between the 8th resistance and the 7th resistance；
First triode, the emitter stage of first triode is connected with the Section Point, the current collection of first triode
Pole is grounded, and the base stage of first triode is connected with the first node；
9th resistance, one end of the 9th resistance is connected with the Section Point；
4th diode, the 4th diode and the 9th resistor coupled in parallel；
Electrochemical capacitor, the positive pole of the electrochemical capacitor is connected with the other end of the 9th resistance, the negative pole ground connection of the electrochemical capacitor,
Wherein, there is the 3rd node, the 3rd node is used to provide the benchmark between the electrochemical capacitor and the 9th resistance
Signal；
Second comparator, the positive input terminal of second comparator is connected with the 3rd node, second comparator it is negative
Input is connected as the input of the signal modulation circuit with the output end of the signal generating circuit, and described second compares
The output end of device is connected as the output end of the signal modulation circuit with the signal amplification circuit, second comparator
Power end is connected with default power supply, the ground terminal ground connection of second comparator.
5. heating control apparatus of electromagnetic heating system according to claim 4, it is characterised in that wherein,
When the resonant switch disconnects, the resonance circuit is in the state that is stopped；
When the resonant switch is closed, the resonance circuit is in running order.
6. heating control apparatus of electromagnetic heating system according to claim 4, it is characterised in that wherein, when described
When the resistance of the 8th resistance is fixed, the negatively correlated relation of resistance of the reference signal and the 7th resistance, the power is opened
Close pipe service time and the resonance circuit power output also with the negatively correlated relation of resistance of the 7th resistance.
7. heating control apparatus of electromagnetic heating system according to claim 4, it is characterised in that wherein, when described
When the resistance of the 7th resistance is fixed, the resistance correlation of the reference signal and the 8th resistance, the power is opened
Close pipe service time and the resonance circuit power output with the resistance correlation of the 8th resistance.
8. heating control apparatus of electromagnetic heating system according to claim 2, it is characterised in that the synchronous feedback
Circuit includes：
Tenth resistance, one end of the tenth resistance is connected with the input of the resonance circuit；
11st resistance, one end of the 11st resistance is connected with the other end of the tenth resistance, the 11st resistance
The other end ground connection, between the tenth resistance and the 11st resistance have fourth node；
12nd resistance, one end of the 12nd resistance is connected with one end of the power switch pipe；
13rd resistance, one end of the 13rd resistance is connected with the other end of the 12nd resistance, the 13rd electricity
The other end ground connection of resistance, has the 5th node between the 12nd resistance and the 13rd resistance；
3rd comparator, the positive input terminal of the 3rd comparator is connected with the fourth node, the 3rd comparator it is negative
Input is connected with the 5th node, and the output end of the 3rd comparator is connected with the output end of the first comparator.
9. heating control apparatus of the electromagnetic heating system according to any one of claim 1-8, it is characterised in that institute
Stating signal amplification circuit includes the push-pull circuit being made up of the second triode and the 3rd triode.
10. a kind of electromagnetic heating system, it is characterised in that add including the electromagnetism according to any one of claim 1-9
The heating control apparatus of hot systems.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510895322.1A CN106851881B (en) | 2015-12-07 | 2015-12-07 | Electromagnetic heating system and heating control device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510895322.1A CN106851881B (en) | 2015-12-07 | 2015-12-07 | Electromagnetic heating system and heating control device thereof |
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| CN106851881B CN106851881B (en) | 2023-11-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114390737A (en) * | 2021-12-17 | 2022-04-22 | 广东美的白色家电技术创新中心有限公司 | Power control circuit and power control method of electromagnetic heating device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203136220U (en) * | 2013-02-21 | 2013-08-14 | 美的集团股份有限公司 | Electromagnetic heating device |
| CN104010399A (en) * | 2013-02-21 | 2014-08-27 | 美的集团股份有限公司 | Electromagnetic heating apparatus and control method thereof |
| CN204442725U (en) * | 2015-03-04 | 2015-07-01 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and breaker in middle pipe thereof opens checkout gear |
| CN205232487U (en) * | 2015-12-07 | 2016-05-11 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and heating control device thereof |
-
2015
- 2015-12-07 CN CN201510895322.1A patent/CN106851881B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203136220U (en) * | 2013-02-21 | 2013-08-14 | 美的集团股份有限公司 | Electromagnetic heating device |
| CN104010399A (en) * | 2013-02-21 | 2014-08-27 | 美的集团股份有限公司 | Electromagnetic heating apparatus and control method thereof |
| CN204442725U (en) * | 2015-03-04 | 2015-07-01 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and breaker in middle pipe thereof opens checkout gear |
| CN205232487U (en) * | 2015-12-07 | 2016-05-11 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and heating control device thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114390737A (en) * | 2021-12-17 | 2022-04-22 | 广东美的白色家电技术创新中心有限公司 | Power control circuit and power control method of electromagnetic heating device |
| CN114390737B (en) * | 2021-12-17 | 2024-06-07 | 广东美的白色家电技术创新中心有限公司 | Power control circuit and power control method of electromagnetic heating device |
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| CN106851881B (en) | 2023-11-03 |
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