CN110225608A - Electromagnetic heating system and its starting control device of power switch tube, method - Google Patents
Electromagnetic heating system and its starting control device of power switch tube, method Download PDFInfo
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- CN110225608A CN110225608A CN201810171923.1A CN201810171923A CN110225608A CN 110225608 A CN110225608 A CN 110225608A CN 201810171923 A CN201810171923 A CN 201810171923A CN 110225608 A CN110225608 A CN 110225608A
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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 system and its starting control devices of power switch tube, method, wherein starting control device includes: zero crossing detection module, and the zero crossing of the AC power source inputted by detection is to export zero cross signal；Driving voltage control module, is connected with protective module and drive module respectively；Main control module, after the instruction for receiving startup power switching tube, first control signal is inputted to driving voltage control module in the failing edge of zero cross signal, and second control signal is inputted to drive module, wherein, drive module provides the first driving signal according to second control signal for power switch tube, and make driving voltage control module according to first control signal by the amplification region driving voltage of the voltage clamp of the first driving signal to power switch tube, to be discharged by driving power switching tube resonance circuit, driving voltage control module controls protective module according to first control signal and stops obtaining protection parameters, to close overcurrent protection function.
Description
Technical field
The present invention relates to electromagnetic heating technique field, in particular to the starting of power switch tube in a kind of electromagnetic heating system
Control device, a kind of electromagnetic heating system, in a kind of electromagnetic heating system power switch tube starting control method.
Background technique
The control method that low-power heating is realized by losing wave, is one of electromagnetic heating low-power control method.Above-mentioned
In method, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) needs continually to open
It is dynamic.
When IGBT starting, generally can first be discharged with amplification region driving voltage driving IGBT resonance circuit.IGBT
In the starting of amplification region driving voltage, conducting voltage is higher, and accidentally overcurrent protection may be carried out to IGBT, i.e., is not required in IGBT
When wanting overcurrent protection, overcurrent protection is carried out to IGBT, influences the normal operation of electromagnetic heating system.
Summary of the invention
The present invention is directed to solve one of the technical problem in above-mentioned technology at least to a certain extent.For this purpose, of the invention
One purpose is to propose a kind of starting control device of power switch tube in electromagnetic heating system, can not only be in power switch
When pipe is with amplification region voltage starting, overcurrent protection function is closed, to prevent from accidentally protecting, it is ensured that electromagnetic heating system operates normally,
And it can reduce instantaneous loss and the electromagnetic noise of power switch tube.
Second object of the present invention is to propose a kind of electromagnetic heating system.
Third object of the present invention is to propose a kind of starting control method of power switch tube in electromagnetic heating system.
In order to achieve the above objectives, first aspect present invention embodiment proposes power switch tube in a kind of electromagnetic heating system
Starting control device, the electromagnetic heating system includes resonance circuit, to control the resonance circuit carries out resonant operational
The power switch tube, to drive the power switch tube to carry out the drive module of on or off and to obtain
The protection parameters of power switch tube are stated to open the protective module of overcurrent protection function, the starting control device includes:
Zero crossing detection module, the zero crossing detection module is by the zero crossing of the AC power source of detection input to export zero cross signal；It drives
Dynamic voltage control module, the driving voltage control module are connected with the protective module and the drive module respectively；Master control
Module, the main control module respectively with the zero crossing detection module, the driving voltage control module and the drive module phase
Even, the main control module is after receiving the instruction for starting the power switch tube, the zero cross signal failing edge to institute
Driving voltage control module input first control signal is stated, and inputs second control signal to the drive module, wherein is described
Drive module provides the first driving signal according to the second control signal for the power switch tube, and makes the driving voltage
Control module is according to the first control signal by voltage clamp the putting to the power switch tube of first driving signal
Great Qu driving voltage, with by driving the power switch tube to discharge the resonance circuit, the driving voltage is controlled
Module controls the protective module according to the first control signal and stops obtaining the protection parameters, to close overcurrent guarantor
Protective function.
The starting control device of power switch tube, passes through zero passage detection in electromagnetic heating system according to an embodiment of the present invention
The zero crossing of the AC power source of module detection input passes through driving voltage control module and protective module to export zero cross signal
It is connected with drive module, and through main control module after the instruction for receiving startup power switching tube, under zero cross signal
Drop inputs first control signal along to driving voltage control module, and inputs second control signal to drive module, and pass through
Drive module provides the first driving signal according to second control signal for power switch tube, and make driving voltage control module according to
First control signal is by the amplification region driving voltage of the voltage clamp of the first driving signal to power switch tube, to pass through driving function
Rate switching tube discharges to resonance circuit, and driving voltage control module controls protective module stopping according to first control signal and obtains
Protection parameters are taken, to close overcurrent protection function.It as a result, can not only be in power switch tube with amplification region voltage starting
When, overcurrent protection function is closed, to prevent from accidentally protecting, it is ensured that electromagnetic heating system operates normally, and can reduce power and open
Close instantaneous loss and the electromagnetic noise of pipe.
In addition, in the electromagnetic heating system proposed according to that above embodiment of the present invention power switch tube starting control device
It can also have the following additional technical features:
In one embodiment of the invention, the protective module includes: first diode, the yin of the first diode
Pole is connected with the collector of the power switch tube；First resistor, one end of the first resistor and the first diode
Anode is connected, test side of the other end of the first resistor as the protection parameters.
In one embodiment of the invention, the protection parameters include the voltage of the first resistor, described
The sum of the conduction voltage drop of one diode and the conducting voltage of the power switch tube.
In one embodiment of the invention, the drive module includes: driving chip, and the first of the driving chip is drawn
Foot is connected to receive the second control signal with the main control module, and the second pin and third pin of the driving chip are made
For the power supply end of the driving chip, the 4th pin of the driving chip be connected with the base stage of the power switch tube with
First driving signal, the 5th pin of the driving chip and the protection parameters are provided to the power switch tube
Test side be connected, the 6th pin of the driving chip be connected with the main control module so as to the main control module acquisition described in
Protection parameters.
In one embodiment of the invention, the driving voltage control module includes: amplifying unit, the amplifying unit
It is connected with the main control module to be amplified to the first control signal；Clamp units, the clamp units respectively with put
Big unit is connected with the base stage of the power switch tube, with according to amplified first control signal by first driving signal
Voltage clamp to the power switch tube amplification region driving voltage.
Specifically, the first control signal is high level signal, and the second control signal is PPG pulse signal.
In one embodiment of the invention, the main control module exports the time of the first control signal relative to defeated
The first preset time of time advance of the second control signal out.
In one embodiment of the invention, when discharging the power switch tube, if the zero passage detection
Module detects the zero crossing of the AC power source of input, then the main control module is believed to drive module input third control
Number, so that the drive module provides the second driving signal according to the second control signal for the power switch tube, wherein
The voltage of second driving signal is the saturation region driving voltage of the power switch tube.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of electromagnetic heating system comprising this hair
The starting control device of power switch tube in the electromagnetic heating system that bright first aspect embodiment proposes.
Electromagnetic heating system according to an embodiment of the present invention, can not only be in power switch tube with amplification region voltage starting
When, overcurrent protection function is closed, to prevent from accidentally protecting, it is ensured that electromagnetic heating system operates normally, and can reduce power and open
Close instantaneous loss and the electromagnetic noise of pipe.
In order to achieve the above objectives, third aspect present invention embodiment proposes power switch tube in a kind of electromagnetic heating system
Starting control method, the electromagnetic heating system includes resonance circuit, to control the resonance circuit carries out resonant operational
The power switch tube, to drive the power switch tube to carry out the drive module of on or off, described to obtain
The protection parameters of power switch tube with open overcurrent protection function protective module and respectively with the protective module and
The connected driving voltage control module of the drive module, the starting control method include: the alternating current by detection input
The zero crossing in source is to export zero cross signal；After receiving the instruction for starting the power switch tube, in the zero cross signal
Failing edge inputs first control signal to the driving voltage control module, and believes to the second control of drive module input
Number, wherein the drive module provides the first driving signal according to the second control signal for the power switch tube, and makes
The driving voltage control module is according to the first control signal by the voltage clamp of first driving signal to the function
The amplification region driving voltage of rate switching tube, it is described to be discharged by the driving power switch tube the resonance circuit
Driving voltage control module controls the protective module according to the first control signal and stops obtaining the protection parameters,
To close overcurrent protection function.
Specifically, the first control signal is high level signal, and the second control signal is PPG pulse signal.
In one embodiment of the invention, the time for exporting the first control signal is controlled relative to exporting described second
The first preset time of time advance of signal processed.
In one embodiment of the invention, when discharging the power switch tube, if detecting input
The zero crossing of AC power source then controls signal to drive module input third, so that the drive module is according to described the
Three control signals provide the second driving signal for the power switch tube, wherein the voltage of second driving signal is described
The saturation region driving voltage of power switch tube.
The starting control method of power switch tube in electromagnetic heating system according to an embodiment of the present invention is inputted by detection
AC power source zero crossing to export zero cross signal, and after the instruction for receiving startup power switching tube, believe in zero passage
Number failing edge to driving voltage control module input first control signal, and to drive module input second control signal,
In, drive module provides the first driving signal according to second control signal for power switch tube, and makes driving voltage control module
According to first control signal by the amplification region driving voltage of the voltage clamp of the first driving signal to power switch tube, driven with passing through
Dynamic power switch tube discharges to resonance circuit, and driving voltage control module controls protective module according to first control signal and stops
Protection parameters are obtained, only to close overcurrent protection function.It can not only be opened as a result, in power switch tube with amplification region voltage
When dynamic, overcurrent protection function is closed, to prevent from accidentally protecting, it is ensured that electromagnetic heating system operates normally, and can reduce power
The instantaneous loss of switching tube and electromagnetic noise.
Detailed description of the invention
Fig. 1 is the knot according to the electromagnetic heating system of the starting control device including power switch tube of the embodiment of the present invention
Structure schematic diagram；
Fig. 2 is the electromagnetic heating system according to the starting control device including power switch tube of one embodiment of the invention
Structural schematic diagram；
Fig. 3 is the waveform diagram according to multiple signals of one embodiment of the invention；
Fig. 4 is the waveform diagram according to multiple signals of another embodiment of the present invention；
Fig. 5 is the process according to the starting control method of power switch tube in the electromagnetic heating system of the embodiment of the present invention
Figure.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawing come describe the embodiment of the present invention electromagnetic heating system and its power switch tube starting control
Device, method.
Fig. 1 is the knot according to the electromagnetic heating system of the starting control device including power switch tube of the embodiment of the present invention
Structure schematic diagram.
As shown in Figure 1, the starting control device of the embodiment of the present invention includes zero crossing detection module 10, driving voltage control mould
Block 20 and main control module 30.The electromagnetic heating system of the embodiment of the present invention, it may include resonance circuit 40, to control resonance circuit
It carries out the power switch tube 50 of resonant operational, carry out the drive module 60 and use of on or off to control R-T tube
The protective module 70 of overcurrent protection function is opened to obtain the protection parameters of power switch tube.Wherein, power switch tube
It can be IGBT.Resonance circuit 40 may include heating coil 41 and resonant capacitance 42.The collection of resonant capacitance 42 and power switch tube 50
Electrode C is connected and has first node A, and the resonant voltage waveforms of first node A can be as shown in Figure 3.Energy supply control module 80 is defeated
AC power source out can after the first filter module 90, rectification module 100, the second filter module 110 and smooth filter capacitor 120
Feed to heating coil 41.
Wherein, as shown in Fig. 2, the second filter module 110 may include filter capacitor C1 and filter inductance L1, filter capacitor C1
Both ends can be connected with rectification module 100 respectively, and one end of filter capacitor C1 can be grounded, and the other end of filter capacitor C1 can be with filter
Wave inductance L1 is connected, and the other end of filter inductance L1 can be connected with smothing filtering capacitor 120.
In one embodiment of the invention, zero crossing detection module 10 by detection input AC power source zero crossing with
Export zero cross signal；Driving voltage control module 20 is connected with protective module 70 and drive module 60 respectively；Main control module 30 divides
It is not connected with zero crossing detection module 10, driving voltage control module 20 and drive module 60, main control module 30 is receiving starting
After the instruction of power switch tube 50, first control signal is inputted to driving voltage control module 20 in the failing edge of zero cross signal,
And second control signal is inputted to drive module 60.Wherein, drive module 60 can be power switch tube according to second control signal
50 provide the first driving signals, and make driving voltage control module 20 according to first control signal by the voltage of the first driving signal
It clamps to the amplification region driving voltage of power switch tube, to be discharged by driving power switching tube resonance circuit 40, drives
Dynamic voltage control module 20 controls protective module according to first control signal and stops obtaining protection parameters, to close overcurrent guarantor
Protective function.
It is detected as shown in figure 3, zero crossing detection module 10 can be converted to ac supply signal by the zero volt in period of half-wave
Input signal, and input signal is detected according to zero volt and exports zero cross signal.In one embodiment of the invention, as shown in Fig. 2,
Protective module 70 may include first diode D1 and first resistor R1.Wherein, the cathode and power switch tube of first diode D1
50 collector is connected；One end of first resistor R1 is connected with the anode of first diode D1, and the other end of first resistor R1 can
Test side as protection parameters.Wherein, the test side of protection parameters has voltage detecting function.
Specifically, protection parameters may include the conduction voltage drop and function of the voltage of first resistor R1, first diode D1
The sum of the conducting voltage of rate switching tube 50.Wherein, by adjusting the resistance value of first resistor R1, the both ends first resistor R1 are adjusted
Voltage, thus adjustable protection parameters.
Wherein, first diode D1 can be high-voltage diode, i.e. the pressure voltage of first diode D1 can be greater than power switch
The maximum operating voltage of pipe 50.
In one embodiment of the invention, as shown in Fig. 2, drive module 60 includes driving chip 61.Wherein, core is driven
First pin a of piece is connected to receive second control signal with main control module 30, and the second pin b and third of driving chip 61 draw
Power supply end of the foot c as driving chip 61, the 4th pin d of driving chip 61 be connected with the base stage of power switch tube 50 with
The first driving signal, the 5th pin e and the test side phase of protection parameters of driving chip 61 are provided to power switch tube 50
Even, the 6th pin f of driving chip 61 is connected so that main control module 30 obtains protection parameters with main control module 30.
Specifically, as shown in Fig. 2, the first pin a of driving chip can pass through the function of second resistance R2 and main control module 30
Rate switching tube drives port to be connected to receive second control signal.The second pin b of driving chip 61 can be grounded.Driving chip 61
Third pin c can be connected with default power supply VCC, the third pin c of driving chip 61 can be also grounded by first capacitor C2.It drives
4th pin d of dynamic chip 61 can be connected by 3rd resistor R3 with the cathode of the 4th diode D4, the D4 sun of the 4th diode
Pole can be connected with the base stage of power switch tube 50, and one end of the 4th resistance R4 can be connected with the 4th pin d of driving chip 61, the
The other end of four resistance R4 can be connected with the D4 anode of the 4th diode, and the D4 anode of the 4th diode can also pass through the 5th resistance
R5 ground connection, the D4 anode of the 4th diode can also be connected with the cathode of the second voltage-stabiliser tube ZD2, and the anode of the second voltage-stabiliser tube ZD2 can
Ground connection.5th pin e of driving chip 61 can be connected with the test side of protection parameters, the 5th pin e of driving chip 61
It can be also grounded by the second capacitor C3.6th pin f of driving chip 61 can pass through the power switch of resistance and main control module 30
Protection of pipe detects port and is connected so that main control module 30 obtains protection parameters.
In one embodiment of the invention, drive module 60 has overcurrent protection function.When power switch tube 50 is ended
When, first diode D1 cut-off, the test side of protection parameters can close overcurrent protection function.When power switch tube 50 is connected
When, be delayed the second preset time, the openable overcurrent protection function in the test side of protection parameters, the exportable perseverance of drive module 60
Galvanic electricity stream.Wherein, the second preset time is smaller than equal to 0.5 microsecond.At this point, can be detected by the test side of protection parameters
To protection parameters, the i.e. conducting of the voltage of first resistor R1, the conduction voltage drop of first diode D1 and power switch tube 50
The sum of voltage.The conducting electric current of power switch tube 50 is bigger, and the conducting voltage of power switch tube 50 is bigger, protection parameters
It is bigger.When protection parameters are greater than preset value, drive module 60 can immediately turn off power switch tube 50, to prevent power switch
The breakdown of 50 overcurrent of pipe.
In one embodiment of the invention, drive module 60 is in above-described embodiment other than overcurrent protection function,
Also there is power switch tube drives voltage range defencive function, can be detected the driving voltage of power switch tube 50, when power is opened
The driving voltage for closing pipe 50 exceeds the first preset range, such as when the voltage range beyond 12~25V, drive module 60 can stop
Output.Also, also there is 50 maximum pulse defencive function of power switch tube, i.e. the maximum pulse of power switch tube can
For the pulse width in 20kHZ that works, when exceeding the pulse width, drive module 60 can stop exporting.Moreover, also having function
Rate switching tube 50 protects signal feedback function, i.e. the protection signal of power switch tube 50 can be fed back to master control mould by drive module 60
Block 30.
In one embodiment of the invention, as shown in Fig. 2, driving voltage control module 20 includes amplifying unit and clamp
Unit.
Wherein, amplifying unit can be connected to amplify to first control signal with main control module；Clamp units can be distinguished
Be connected with the base stage of amplifying unit and power switch tube 50, with according to amplified first control signal by the first driving signal
Voltage clamp to power switch tube amplification region driving voltage.Specifically, amplifying unit can be the first triode Q1, the one or three pole
The base stage of pipe Q1 is connected to receive first control signal, the emitter ground connection of the first triode Q1 with main control module 30.Wherein,
The collector of one triode Q1 can be connected with the cathode of the second diode D2, and the anode of the second diode D2 is with first resistor R1's
One end is connected.Clamp units can be the first voltage-stabiliser tube ZD1, the collector of the anode of the first voltage-stabiliser tube ZD1 and the first triode Q1
Be connected, the cathode of the first voltage-stabiliser tube ZD1 is connected with the base stage of power switch tube 50, wherein the base stage of power switch tube 50 also with
The anode of third diode D3 is connected, and the cathode of third diode D3 is connected to default power supply VCC.
Specifically, the base stage of the first triode Q1 can pass through the power switch tube drives of the 7th resistance R7 and main control module 30
Voltage selects control port to be connected to receive first control signal.
In one embodiment of the invention, since there are smothing filtering capacitors in the resonant tank of electromagnetic heating system
120, therefore power switch tube 50 is on startup, conducting voltage is higher.As shown in figure 3, main control module 30 is receiving starting
It, can be to driving chip 61 in the failing edge for the zero cross signal that zero crossing detection module 10 exports after the instruction of power switch tube 50
First pin a inputs second control signal.After the frequency of the second control signal is amplified the first presupposition multiple by driving chip 61,
The first driving signal can be exported by the 4th pin d.Wherein, second control signal can be PPG (Program Pulse
Generator, PPG programme pulse generator) pulse signal.Meanwhile first zener diode can reverse-conducting so that driving chip
61 output the first driving signals voltage clamp to power switch tube 50 amplification region driving voltage, i.e., it is driving chip 61 is defeated
The voltage of the first driving signal out is limited in the amplification region driving voltage of power switch tube 50, it is made to keep opposite constant,
To be discharged by driving power switching tube 50 resonance circuit 40.Wherein, with amplification region driving voltage driving power switch
Pipe 50 and can be third preset time T 1 to the duration that resonance circuit 40 discharges.
Main control module 30 can input the first control letter to the base stage of the first triode Q1 in driving voltage control module 20
Number, i.e. high level signal, the emitter ground connection of the first triode Q1, thus the first triode Q1 can be made to be connected.Protective module is logical
The voltage of first resistor R1 and the sum of the conduction voltage drop of the second diode D2 can be detected in the test side for crossing protection parameters, and
It is pre- can not to detect that the sum of protection parameters, and conduction voltage drop of the voltage of first resistor R1 and the second diode D2 are less than
If value, is unsatisfactory for the condition of overcurrent protection, thus can close overcurrent protection function.It can avoid emergent power switching tube 50 as a result,
When with the starting of amplification region driving voltage, conducting voltage is higher and the phenomenon that carry out overcurrent protection.
When drive module 60 exports the driving signal of smaller pulse width with driving power switching tube 50, as shown in figure 4,
In AC power source zero crossing, the voltage of resonant capacitance B point can be gradually lowered to zero or close to zero.Function can be reduced as a result,
The instantaneous loss of rate switching tube 50, for example, the loss of 1 microsecond can be shared 1 millisecond, while can reduce electromagnetic noise.
In one embodiment of the invention, as shown in figure 3, the time of the output first control signal of main control module 30 is opposite
In the first preset time t of time advance 1 of output second control signal.Wherein, it is micro- can be more than or equal to 0.3 for the first preset time t 1
Second.Thus, it can be ensured that driving voltage control module 20 effectively drives, and makes power switch tube 50 can be in amplification region driving voltage work
Make.
In one embodiment of the invention, when discharging power switch tube 50, if zero crossing detection module 10
Detect the zero crossing of the AC power source of input, then main control module inputs third to drive module 60 and controls signal, so that driving
It is that power switch tube 50 provides the second driving signal that module 60, which controls signal according to third, wherein the voltage of the second driving signal
For the saturation region driving voltage of power switch tube 50.
That is, when 60 driving power switching tube 50 of drive module discharges, zero crossing detection module 10 detects input
When the zero crossing of AC power source, main control module can input third to the first pin a of drive module 60 and control signal.Drive module
60 by third control signal frequency amplify the second presupposition multiple when, can by the 4th pin d export the second driving signal, and will
The base stage of the second driving signal input power switch pipe 50.The voltage of second driving signal can be the full of power switch tube 50
With area's driving voltage, to discharge power switch tube.
Further, as shown in figure 3, can the driving signal to power switch tube 50 lose wave processing, can be in millisecond
Stop the driving pulse of input preset quantity in the time of grade.When the driving signal to power switch tube 50 carries out losing wave processing
When, power switch tube 50 need to continually start, the starting control method of power switch tube 50 through the foregoing embodiment, can be effective
Ground prevents power switch tube 50 from entering overcurrent protection on startup.It can not only guarantee that electromagnetic heating system reaches continuous as a result,
The effect of low-power heating, and can reduce the operating temperature of power switch tube 50, it realizes to the effective of power switch tube 50
Protection.
The starting control device of power switch tube, passes through zero passage detection in electromagnetic heating system according to an embodiment of the present invention
The zero crossing of the AC power source of module detection input passes through driving voltage control module and protective module to export zero cross signal
It is connected with drive module, and through main control module after the instruction for receiving startup power switching tube, under zero cross signal
Drop inputs first control signal along to driving voltage control module, and inputs second control signal to drive module, and pass through
Drive module provides the first driving signal according to second control signal for power switch tube, and make driving voltage control module according to
First control signal is by the amplification region driving voltage of the voltage clamp of the first driving signal to power switch tube, to pass through driving function
Rate switching tube discharges to resonance circuit, and driving voltage control module controls protective module stopping according to first control signal and obtains
Protection parameters are taken, to close overcurrent protection function.It as a result, can not only be in power switch tube with amplification region voltage starting
When, overcurrent protection function is closed, to prevent from accidentally protecting, it is ensured that electromagnetic heating system operates normally, and can reduce power and open
Close instantaneous loss and the electromagnetic noise of pipe.
Corresponding above-described embodiment, the present invention also propose a kind of electromagnetic heating system.
The electromagnetic heating system of the embodiment of the present invention, including the above embodiment of the present invention propose electromagnetic heating system in function
The starting control device of rate switching tube, specific embodiment can refer to above-described embodiment, and details are not described herein.
Electromagnetic heating system according to an embodiment of the present invention, can not only be in power switch tube with amplification region voltage starting
When, overcurrent protection function is closed, to prevent from accidentally protecting, it is ensured that electromagnetic heating system operates normally, and can reduce power and open
Close instantaneous loss and the electromagnetic noise of pipe.
Corresponding above-described embodiment, the present invention also propose a kind of starting controlling party of power switch tube in electromagnetic heating system
Method.
Referring to Figures 1 and 2, the electromagnetic heating system of the embodiment of the present invention, it may include resonance circuit, to control resonance electricity
Road carry out resonant operational power switch tube, to control R-T tube carry out on or off drive module and to
The protection parameters of power switch tube are obtained to open the protective module of overcurrent protection function.Wherein, power switch tube can be
IGBT.Resonance circuit may include heating coil and resonant capacitance.Resonant capacitance is connected and has with the collector of power switch tube
First node A.The AC power source of energy supply control module output is through the first filter module, rectification module, the second filter module peace
Heating coil can be fed to after sliding filter capacitor.
Wherein, the second filter module may include filter capacitor and filter inductance, both ends of filter capacitor can respectively with rectification mould
Block is connected, and one end of filter capacitor can be grounded, and the other end of filter capacitor can be connected with filter inductance, filter inductance it is another
End can be connected with smothing filtering capacitor.
As shown in figure 5, in the electromagnetic heating system of the embodiment of the present invention power switch tube starting control method, including with
Lower step:
S1, the zero crossing of the AC power source inputted by detection is to export zero cross signal.
As shown in figure 3, ac supply signal can be converted to using half-wave as the zero volt in period detection input signal, and according to
Zero volt detects input signal and exports zero cross signal.
S2 controls mould to driving voltage in the failing edge of zero cross signal after the instruction for receiving startup power switching tube
Block inputs first control signal, and inputs second control signal to drive module, wherein drive module is according to second control signal
The first driving signal is provided for power switch tube, and believes that driving voltage control module by the first driving according to first control signal
Number voltage clamp to power switch tube amplification region driving voltage, to be put by driving power switching tube to resonance circuit
Electricity, driving voltage control module controls protective module according to first control signal and stops obtaining protection parameters, to close
Flow defencive function.
In one embodiment of the invention, protective module may include first diode and first resistor.Wherein, the one two
The cathode of pole pipe is connected with the collector of power switch tube；One end of first resistor is connected with the anode of first diode, and first
Test side of the other end of resistance as protection parameters.Wherein, the test side of protection parameters has voltage detecting function
Energy.
Specifically, protection parameters may include that the voltage of first resistor, the conduction voltage drop of first diode and power are opened
Close the sum of the conducting voltage of pipe.Wherein, by the resistance value of adjusting first resistor, the voltage at first resistor both ends is adjusted, thus
Adjustable protection parameters.Wherein, first diode can be high-voltage diode, i.e. the pressure voltage of first diode can be greater than function
The maximum operating voltage of rate switching tube.
In one embodiment of the invention, drive module includes driving chip.Wherein, the first pin of driving chip with
Main control module is connected to receive second control signal, power supply of the second pin and third pin of driving chip as driving chip
Power end, the 4th pin of driving chip are connected to provide the first driving letter to power switch tube with the base stage of power switch tube
Number, the 5th pin of driving chip is connected with the test side of protection parameters, the 6th pin and main control module of driving chip
It is connected so that main control module obtains protection parameters.
Specifically, the first pin of driving chip can pass through the power switch tube drives port of second resistance and main control module
It is connected to receive second control signal.The second pin of driving chip can be grounded.The third pin of driving chip can be with default electricity
Source is connected, and the third pin of driving chip can be also grounded by first capacitor.4th pin of driving chip can pass through third electricity
Resistance is connected with the cathode of the 4th diode, and the anode of the 4th diode can be connected with the base stage of power switch tube, the 4th resistance
One end can be connected with the 4th pin of driving chip, and the other end of the 4th resistance can be connected with the anode of the 4th diode, and the 4th
The anode of diode can also can be also connected by the 5th resistance eutral grounding, the anode of the 4th diode with the cathode of the second voltage-stabiliser tube,
The anode of second voltage-stabiliser tube can be grounded.5th pin of driving chip can be connected with the test side of protection parameters, drive core
5th pin of piece can also pass through the second capacity earth.6th pin of driving chip can pass through the power of resistance and main control module
Protection of pipe test side mouthful is switched to be connected so that main control module obtains protection parameters.
In one embodiment of the invention, drive module has overcurrent protection function.That is, working as power switch tube
When cut-off, first diode cut-off, the test side of protection parameters can close overcurrent protection function.When power switch tube is connected
When, be delayed the second preset time, the openable overcurrent protection function in the test side of protection parameters, the exportable constant current of drive module
Electric current.Wherein, the second preset time is smaller than equal to 0.5 microsecond.At this point, can be detected by the test side of protection parameters
The sum of protection parameters, the i.e. voltage of first resistor, the conduction voltage drop of first diode and the conducting voltage of power switch tube.
The conducting electric current of power switch tube is bigger, and the conducting voltage of power switch tube is bigger, and protection parameters are also bigger.When overcurrent is protected
It protects parameter and is greater than preset value, drive module can immediately turn off power switch tube, to prevent power switch tube overcurrent from puncturing.
In one embodiment of the invention, drive module is in above-described embodiment other than overcurrent protection function, also
With power switch tube drives voltage range defencive function, it can be detected the driving voltage of power switch tube, work as power switch tube
Driving voltage exceed the first preset range, such as when the voltage range beyond 12~25V, drive module can stop exporting.And
And drive module also has power switch tube maximum pulse defencive function, i.e. the maximum pulse of power switch tube can
For the pulse width in 20kHZ that works, when exceeding the pulse width, drive module can stop exporting.Also, drive module function
Rate switchs protection of pipe signal feedback function, i.e. the protection signal of power switch tube can be fed back to main control module by drive module.
In one embodiment of the invention, driving voltage control module includes amplifying unit and clamp units.
Wherein, amplifying unit can be connected to amplify to first control signal with main control module；Clamp units can be distinguished
Be connected with the base stage of amplifying unit and power switch tube, with according to amplified first control signal by the electricity of the first driving signal
Pressure is clamped to the amplification region driving voltage of power switch tube.
Specifically, amplifying unit can be the first triode, and the base stage of the first triode is connected to receive the with main control module
One control signal, the emitter ground connection of the first triode.Wherein, the collector of the first triode can be with the cathode of the second diode
It is connected, the anode of the second diode is connected with one end of first resistor.Clamp units can be the first voltage-stabiliser tube, the first voltage-stabiliser tube
Anode is connected with the collector of the first triode, and the cathode of the first voltage-stabiliser tube is connected with the base stage of power switch tube, wherein power
The base stage of switching tube is also connected with the anode of third diode, and the cathode of third diode is connected to default power supply.
Specifically, the base stage of the first triode can be selected by the power switch tube drives voltage of the 7th resistance and main control module
Control port is selected to be connected to receive first control signal.
In one embodiment of the invention, in the resonant tank of electromagnetic heating system due to there are smothing filtering capacitor,
Therefore on startup, conducting voltage is higher for power switch tube.Main control module after the instruction for receiving startup power switching tube,
In the failing edge of the zero cross signal of zero crossing detection module output, second control signal can be inputted to the first pin of driving chip.
After the frequency of the second control signal is amplified the first presupposition multiple by driving chip, the first driving can be exported by the 4th pin and is believed
Number.Wherein, second control signal can be PPG pulse signal.Meanwhile first zener diode can reverse-conducting so that driving core
The voltage of first driving signal of piece output can be clamped to the amplification region driving voltage of power switch tube, i.e., export driving chip
The voltage of the first driving signal be limited in the amplification region driving voltage of power switch tube, so that it is kept opposite constant, with logical
Power switch tube of overdriving discharges to resonance circuit.Wherein, with amplification region driving voltage driving power switching tube and to humorous
The duration that vibration circuit discharges can be third preset time T 1.
Main control module can input first control signal to the base stage of the first triode in driving voltage control module, i.e., high
Level signal, the emitter ground connection of the first triode, thus the first triode ON can be made.Protective module is joined by overcurrent protection
The sum of voltage and conduction voltage drop of the second diode of first resistor can be detected in several test sides, and can not detect overcurrent and protect
Parameter is protected, and the sum of conduction voltage drop of the voltage of first resistor and the second diode is less than preset value, is unsatisfactory for overcurrent protection
Condition, thus overcurrent protection function can be closed.It can avoid emergent power switching tube as a result, with the starting of amplification region driving voltage
When, conducting voltage is higher and the phenomenon that carrying out overcurrent protection.
When the driving signal of drive module output smaller pulse width is with driving power switching tube, in AC power source zero passage
When point, the voltage of resonant capacitance B point can be gradually lowered to zero or close to zero.Cpable of lowering power switching tube is instantaneous as a result,
Loss, for example, the loss of 1 microsecond can be shared 1 millisecond, while can reduce electromagnetic noise.
In one embodiment of the invention, the time of main control module output first control signal is controlled relative to output second
The first preset time of time advance of signal processed.Wherein, the first preset time can be more than or equal to 0.3 microsecond.Thus, it can be ensured that drive
Dynamic voltage control module effectively drives, so that power switch tube can work in amplification region driving voltage.
In one embodiment of the invention, when discharging power switch tube, if zero crossing detection module detects
To the zero crossing of the AC power source of input, then main control module controls signal to drive module input third, so that drive module root
The second driving signal is provided for power switch tube according to third control signal, wherein the voltage of the second driving signal is power switch
The saturation region driving voltage of pipe.
That is, when drive module driving power switchs tube discharge, zero crossing detection module detects the alternating current of input
When the zero crossing in source, main control module can input third to the first pin of drive module and control signal.Drive module is by third control
When the frequency of signal processed amplifies the second presupposition multiple, the second driving signal can be exported by the 4th pin, and this second is driven
The base stage of signal input power switch pipe.The voltage of second driving signal can be the saturation region driving voltage of power switch tube,
To discharge power switch tube.
Further, as shown in figure 3, can the driving signal to power switch tube lose wave processing, i.e., in Millisecond
Stop the driving pulse of input preset quantity in time.When the driving signal to power switch tube carries out losing wave processing, power
Switching tube need to continually start, and power can be effectively prevented in the starting control method of power switch tube through the foregoing embodiment
Switching tube enters overcurrent protection on startup.It can not only guarantee that electromagnetic heating system reaches continuous low power heating as a result,
Effect, and can reduce the operating temperature of power switch tube, realize the effective protection to power switch tube.
The starting control method of power switch tube in electromagnetic heating system according to an embodiment of the present invention is inputted by detection
AC power source zero crossing to export zero cross signal, and after the instruction for receiving startup power switching tube, believe in zero passage
Number failing edge to driving voltage control module input first control signal, and to drive module input second control signal,
In, drive module provides the first driving signal according to second control signal for power switch tube, and makes driving voltage control module
According to first control signal by the amplification region driving voltage of the voltage clamp of the first driving signal to power switch tube, driven with passing through
Dynamic power switch tube discharges to resonance circuit, and driving voltage control module controls protective module according to first control signal and stops
Protection parameters are obtained, only to close overcurrent protection function.It can not only be opened as a result, in power switch tube with amplification region voltage
When dynamic, overcurrent protection function is closed, to prevent from accidentally protecting, it is ensured that electromagnetic heating system operates normally, and can reduce power
The instantaneous loss of switching tube and electromagnetic noise.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (13)
1. the starting control device of power switch tube in a kind of electromagnetic heating system, which is characterized in that the electromagnetic heating system
The power switch tube of resonant operational is carried out including resonance circuit, to control the resonance circuit, to drive the function
The drive module and the protection parameters to obtain the power switch tube that rate switching tube carries out on or off are to open
The protective module of overcurrent protection function is opened, the starting control device includes:
Zero crossing detection module, the zero crossing detection module export zero passage letter by the zero crossing of the AC power source of detection input
Number；
Driving voltage control module, the driving voltage control module respectively with the protective module and the drive module phase
Even；
Main control module, the main control module respectively with the zero crossing detection module, the driving voltage control module and the drive
Dynamic model block is connected, and the main control module is after receiving the instruction for starting the power switch tube, under the zero cross signal
Drop inputs first control signal along to the driving voltage control module, and inputs second control signal to the drive module,
Wherein, the drive module provides the first driving signal according to the second control signal for the power switch tube, and
Make the driving voltage control module according to the first control signal by the voltage clamp of first driving signal to described
The amplification region driving voltage of power switch tube, to be discharged by the driving power switch tube the resonance circuit, institute
It states driving voltage control module and the protective module stopping acquisition overcurrent protection ginseng is controlled according to the first control signal
Number, to close overcurrent protection function.
2. the starting control device of power switch tube in electromagnetic heating system according to claim 1, which is characterized in that institute
Stating protective module includes:
First diode, the cathode of the first diode are connected with the collector of the power switch tube；
First resistor, one end of the first resistor are connected with the anode of the first diode, the first resistor it is another
Hold the test side as the protection parameters.
3. the starting control device of power switch tube in electromagnetic heating system according to claim 2, which is characterized in that institute
State voltage, the first diode that protection parameters include the first resistor conduction voltage drop and the power switch tube
The sum of conducting voltage.
4. the starting control device of power switch tube in electromagnetic heating system according to claim 2, which is characterized in that institute
Stating drive module includes:
Driving chip, the first pin of the driving chip are connected to receive the second control signal with the main control module,
Power supply end of the second pin and third pin of the driving chip as the driving chip, the of the driving chip
Four pins are connected to provide first driving signal, the drive to the power switch tube with the base stage of the power switch tube
5th pin of dynamic chip is connected with the test side of the protection parameters, the 6th pin of the driving chip and the master
Module is controlled to be connected so that the main control module obtains the protection parameters.
5. the starting control device of power switch tube in electromagnetic heating system according to claim 4, which is characterized in that institute
Stating driving voltage control module includes:
Amplifying unit, the amplifying unit are connected to amplify to the first control signal with the main control module；
Clamp units, the clamp units are connected with the base stage of the amplifying unit and the power switch tube respectively, with basis
Amplified first control signal drives the amplification region of the voltage clamp of first driving signal to the power switch tube
Voltage.
6. the starting control device of power switch tube in electromagnetic heating system according to claim 5, which is characterized in that institute
Stating first control signal is high level signal, and the second control signal is PPG pulse signal.
7. the starting control device of power switch tube in electromagnetic heating system according to claim 6, which is characterized in that institute
It states main control module and exports the time of the first control signal relative to the time advance first for exporting the second control signal
Preset time.
8. the starting control device of power switch tube in electromagnetic heating system according to claim 1, which is characterized in that
When discharging the power switch tube, if the zero crossing detection module detects the zero crossing of the AC power source of input,
Then the main control module controls signal to drive module input third, so that the drive module is controlled according to the third
Signal provides the second driving signal for the power switch tube, wherein the voltage of second driving signal is that the power is opened
Close the saturation region driving voltage of pipe.
9. a kind of electromagnetic heating system, which is characterized in that including electromagnetic heating system according to claim 1 to 8
The starting control device of power switch tube in system.
10. the starting control method of power switch tube in a kind of electromagnetic heating system, which is characterized in that the electromagnetic heating system
The power switch tube of resonant operational is carried out including resonance circuit, to control the resonance circuit, to drive the function
Rate switching tube carries out the drive module of on or off, to obtain the protection parameters of the power switch tube to open
The driving voltage control mould for flowing the protective module of defencive function and being connected respectively with the protective module and the drive module
Block, the starting control method include:
The zero crossing of the AC power source inputted by detection is to export zero cross signal；
After receiving the instruction for starting the power switch tube, the zero cross signal failing edge to the driving voltage control
Molding block input first control signal, and to the drive module input second control signal, wherein the drive module according to
The second control signal provides the first driving signal for the power switch tube, and make the driving voltage control module according to
The first control signal by the amplification region driving voltage of the voltage clamp of first driving signal to the power switch tube,
With by driving the power switch tube to discharge the resonance circuit, the driving voltage control module is according to described the
One control signal, which controls the protective module, to be stopped obtaining the protection parameters, to close overcurrent protection function.
11. the starting control method of power switch tube in electromagnetic heating system according to claim 10, which is characterized in that
The first control signal is high level signal, and the second control signal is PPG pulse signal.
12. the starting control method of power switch tube in electromagnetic heating system according to claim 11, which is characterized in that
The time of the first control signal is exported relative to the first preset time of time advance for exporting the second control signal.
13. the starting control method of power switch tube in electromagnetic heating system according to claim 10, which is characterized in that
When discharging the power switch tube, if detecting the zero crossing of the AC power source of input, to the driving mould
Block inputs third and controls signal, so that the drive module, which controls signal according to the third, provides for the power switch tube
Two driving signal, wherein the voltage of second driving signal is the saturation region driving voltage of the power switch tube.
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| CN201810171923.1A CN110225608B (en) | 2018-03-01 | 2018-03-01 | Electromagnetic heating system and starting control device and method of power switch tube of electromagnetic heating system |
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| CN201810171923.1A CN110225608B (en) | 2018-03-01 | 2018-03-01 | Electromagnetic heating system and starting control device and method of power switch tube of electromagnetic heating system |
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| CN107027206A (en) * | 2016-02-02 | 2017-08-08 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its heating control circuit and low-power method for heating and controlling |
| CN107041026A (en) * | 2015-07-29 | 2017-08-11 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its current detecting and protection control device, method |
| CN107404778A (en) * | 2016-05-18 | 2017-11-28 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating cooking system and its drive control circuit, detection method |
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| CN107041026A (en) * | 2015-07-29 | 2017-08-11 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its current detecting and protection control device, method |
| CN107027204A (en) * | 2016-02-02 | 2017-08-08 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its heating control circuit and low-power method for heating and controlling |
| CN107027206A (en) * | 2016-02-02 | 2017-08-08 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its heating control circuit and low-power method for heating and controlling |
| CN107404778A (en) * | 2016-05-18 | 2017-11-28 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating cooking system and its drive control circuit, detection method |
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