CN205430652U - Electromagnetic heating device and heating control circuit thereof - Google Patents
Electromagnetic heating device and heating control circuit thereof Download PDFInfo
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- CN205430652U CN205430652U CN201620106928.2U CN201620106928U CN205430652U CN 205430652 U CN205430652 U CN 205430652U CN 201620106928 U CN201620106928 U CN 201620106928U CN 205430652 U CN205430652 U CN 205430652U
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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
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
Abstract
The utility model discloses an electromagnetic heating device and heating control circuit thereof, wherein the heating control circuit includes: voltage zero -crossing detection unit for detect alternating current power supply's voltage zero crossing signal, the resonance heating unit, the rectifying and wave -filtering unit, the power switch pipe, drive unit, drive unit and continuous the opening and turn -offing with the drive power switch tube of the drive end of power switch pipe, drive transformation unit, drive transformation unit links to each other with the driving voltage who changes the power switch pipe with the drive end of power switch pipe, the main control unit, the main control unit judges according to voltage zero crossing signal that the control power switch tube carries out work under a driving voltage's the drive before alternating current power supply's zero crossing to vibrate to hour control power switch tube at the collector voltage of power switch pipe and carry out work under the 2nd driving voltage's the drive, make power switch pipe vary voltage start, thereby the risk that the reduced power switch tube damaged reduces and opens the noise.
Description
Technical field
This utility model relates to electromagnetic heating technique field, particularly to heating control circuit and a kind of electromagnetic heater of a kind of electromagnetic heater.
Background technology
At present, single IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor) electromagnetic resonant circuit generally use parallel resonance mode, and when using the resonant parameter realizing the high-power operation of electromagnetic oven, if run in continuous low power section, then occur the problem that
(1) IGBT voltage is the most open-minded, opens moment and IGBT transient current peak value can be caused high, be well over IGBT current peak specification and limit, damage IGBT；
(2) IGBT can generate heat seriously, needs to strengthen IGBT heat radiation (as increased fin, increasing rotation speed of fan etc.) to realize the temperature increase requirement of IGBT；
(3) if using under dutycycle mode of heating and realizing low-power, i.e. using intermittent heat mode, owing to filter capacitor exists, IGBT exists when next cycle opens and firmly opens phenomenon, is easily caused IGBT and burns.
Utility model content
One of technical problem that this utility model is intended to solve in above-mentioned technology the most to a certain extent.For this, first purpose of the present utility model is to propose the heating control circuit of a kind of electromagnetic heater, voltage transformation unit is driven to start open-minded can control power switch pipe transformation when electromagnetic heater heats by increasing, thus reduce the risk that power switch pipe damages, reduce and open noise.
Second purpose of the present utility model is to propose a kind of electromagnetic heater.
For reaching above-mentioned purpose, the heating control circuit of a kind of electromagnetic heater that this utility model first aspect proposes, including: voltage zero-cross detector unit, described voltage zero-cross detector unit is input to the voltage zero-crossing signal of the alternating current power supply of electromagnetic heater for detection；Resonance heating unit；Rectification filtering unit, described rectification filtering unit carries out resonance heating unit described in rectifying and wave-filtering treatment and supplied to described alternating current power supply；The power switch pipe of resonant operational is carried out for controlling described resonance heating unit；Driver element, described driver element is connected with the drive end of described power switch pipe to drive turning on and off of described power switch pipe；Drive voltage transformation unit, described driving voltage transformation unit be connected with the drive end of described power switch pipe with change described power switch pipe driving voltage；Main control unit, described main control unit respectively with described voltage zero-cross detector unit, described driver element is connected with described driving voltage transformation unit, described main control unit judges before the zero crossing of described alternating current power supply by controlling described driver element and described driving voltage transformation unit so that described power switch pipe is operated under the driving of the first driving voltage according to described voltage zero-crossing signal, and the described driving voltage transformation unit of described main control unit control quits work when the collector voltage of described power switch pipe oscillates to minimum, and by controlling described driver element so that described power switch pipe is operated under the driving of the second driving voltage, wherein, described second driving voltage is more than described first driving voltage.
nullHeating control circuit according to electromagnetic heater of the present utility model，By increasing the driving voltage driving voltage transformation unit to change power switch pipe，So main control unit judges before the zero crossing of alternating current power supply by controlling driver element and driving voltage transformation unit so that power switch pipe is operated under the driving of the first driving voltage according to voltage zero-crossing signal，And main control unit controls to drive voltage transformation unit to quit work when the collector voltage of power switch pipe oscillates to minimum，And by controlling driver element so that power switch pipe is operated under the driving of the second driving voltage，Thus in the way of transformation driving, realize power switch pipe when electromagnetic heater heats and start open-minded，The electric current of opening making power switch pipe reduces，Power switch pipe can be reduced and firmly open the infringement brought，The most also can reduce and open noise，Avoid power switch pipe heating serious，Improve the operational reliability of electromagnetic heater，And the heating power scope of electromagnetic heater can be widened.
Specifically, the work process of described power switch pipe includes first time period and the second time period, and wherein, in described first time period, the amplitude of described first driving voltage keeps constant or linearly increasing, and the pulse width of described first driving voltage is incremented by or wide；In described second time period, the amplitude of described second driving voltage keeps constant, and the pulse width of described second driving voltage is incremented by or wide.
Further, in described first time period, described power switch pipe is operated in magnifying state；In described second time period, described power switch pipe is operated on off state.
Wherein, at the zero crossing of described alternating current power supply, the collector voltage of described power switch pipe oscillates to minimum.
Specifically, in described first time period, described main control unit output described first controls signal to described driver element, output second simultaneously controls signal to described driving voltage transformation unit, so that described power switch pipe is operated under amplitude keeps the driving of constant the first driving voltage, the collector voltage of described power switch pipe carries out vibration and diminishes；In described second time period, described main control unit output described first controls signal to described driver element so that described power switch pipe is operated under the driving of described second driving voltage, and output the 3rd simultaneously controls signal to described driving voltage transformation unit so that described driving voltage transformation unit quits work.
Specifically, described power switch pipe is IGBT, and described power switch pipe is IGBT, and described first control signal is PPG pulse, and described second control signal is high level signal, and described 3rd control signal is low level signal.
Specifically, described driving voltage transformation unit includes: the first resistance, and one end of described first resistance is connected with described main control unit；First audion, the base stage of described first audion is connected with the other end of described first resistance, the grounded emitter of described first audion；Second resistance, described second resistance is connected between base stage and the emitter stage of described first audion；3rd resistance, one end of described first resistance is connected with the colelctor electrode of described first audion, and the other end of described 3rd resistance is connected with the drive end of described driving switching tube.
Further, described driver element includes: the 4th resistance, and one end of described 4th resistance is connected with described main control unit；5th resistance, one end of described 5th resistance is connected with one end and the described main control unit of described 4th resistance respectively, the other end ground connection of described 5th resistance；Second audion, the base stage of described second audion is connected with the other end of described 4th resistance, the grounded emitter of described second audion, and the colelctor electrode of described second audion is connected with the power supply of predeterminated voltage by the 6th resistance；3rd audion, the base stage of described 3rd audion is connected with the colelctor electrode of described second audion, the grounded emitter of described 3rd audion, and the colelctor electrode of described 3rd audion is connected with the power supply of described predeterminated voltage by the 7th resistance；4th audion, the base stage of described 4th audion is connected with the colelctor electrode of described 3rd audion, and the colelctor electrode of described 4th audion is connected with the power supply of described predeterminated voltage by the 8th resistance；5th audion, the base stage of described 5th audion is connected with the base stage of described 4th audion, the grounded collector of described 5th audion；9th resistance, one end of described 9th resistance is connected with the emitter stage of described 5th audion, and the other end of described 9th resistance is connected with the emitter stage of described 4th audion；Tenth resistance, one end of described tenth resistance is connected with the emitter stage of described 4th audion and the other end of described 9th resistance respectively, and the described other end of the tenth resistance is connected with the drive end of described power switch pipe.
Preferably, the heating control circuit of described electromagnetic heater also includes the first stabilivolt and the 11st resistance, the anode of described first stabilivolt be connected with the emitter stage of described IGBT after ground connection, the negative electrode of described first stabilivolt is connected with the gate pole of described IGBT, and described 11st resistance is in parallel with described first stabilivolt.
Additionally, this utility model also proposed a kind of electromagnetic heater, it includes the heating control circuit of above-mentioned electromagnetic heater.
The electromagnetic heater that the utility model proposes, by increasing the driving voltage driving voltage transformation unit to change power switch pipe in heating control circuit, so in the way of transformation driving, realize power switch pipe when electromagnetic heater enters heating interval and start open-minded, so that the electric current of opening of power switch pipe reduces, power switch pipe can be reduced and firmly open the infringement brought, the most also can reduce and open noise, avoid power switch pipe heating serious, improve operational reliability, and heating power scope can be widened.
Accompanying drawing explanation
Fig. 1 is the block diagram of the heating control circuit of the electromagnetic heater according to one embodiment of this utility model；
Fig. 2 is the oscillogram during electromagnetic heater low-power heating operation according to one embodiment of this utility model；
Fig. 3 is the oscillogram during electromagnetic heater low-power heating operation according to another embodiment of this utility model；
Fig. 4 A is the first driving voltage V1 according to one embodiment of this utility model and the change schematic diagram of the second driving voltage V2；
Fig. 4 B is the first driving voltage V1 according to another embodiment of this utility model and the change schematic diagram of the second driving voltage V2；
Fig. 5 is the driver element according to one specific embodiment of this utility model and the circuit diagram driving voltage transformation unit；And
Fig. 6 is the flow chart of the low-power method for heating and controlling of the electromagnetic heater according to this utility model embodiment.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, and the most same or similar label represents same or similar element or has the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary, it is intended to be used for explaining this utility model, and it is not intended that to restriction of the present utility model.
The heating control circuit of electromagnetic heater, the low-power method for heating and controlling of electromagnetic heater and the electromagnetic heater proposed according to this utility model embodiment is described with reference to the accompanying drawings.
Fig. 1 is the block diagram of the heating control circuit of the electromagnetic heater according to one embodiment of this utility model.As it is shown in figure 1, the heating control circuit of this electromagnetic heater includes: voltage zero-cross detector unit 10, resonance heating unit 20, rectification filtering unit 30, power switch pipe 40, driver element 50, driving voltage transformation unit 60 and main control unit 70.
Wherein, voltage zero-cross detector unit 10 is input to the voltage zero-crossing signal of the alternating current power supply (L, N) of electromagnetic heater for detection, such as it is shown in figure 1, voltage zero-cross detector unit 10 is connected with alternating current power supply (L, N).Rectification filtering unit 30 exports unidirectional current supply resonance heating unit 20 after alternating current power supply carries out rectifying and wave-filtering process, as shown in Figure 1, rectification filtering unit 30 includes rectifier bridge 301 and filter inductance L1 and filter capacitor C1, resonance heating unit 20 includes that resonance coil L2 and resonant capacitance C2, resonance coil L2 and resonant capacitance C2 are connected in parallel.Power switch pipe 40 is used for controlling resonance heating unit 20 and carries out resonant operational, and wherein, power switch pipe 40 can be that the colelctor electrode of IGBT, IGBT is connected to resonance coil L2 in parallel and resonant capacitance C2.
nullAs shown in Figure 1，Driver element 50 is connected with the gate pole of the drive end such as IGBT of power switch pipe 40 to drive turning on and off of power switch pipe 40，Drive voltage transformation unit 60 be connected with the gate pole of the drive end such as IGBT of power switch pipe 40 with change power switch pipe 40 driving voltage，Main control unit 70 such as main control chip respectively with voltage zero-cross detector unit 10、Driver element 50 is connected with driving voltage transformation unit 60，Main control unit 70 judges before the zero crossing of alternating current power supply by controlling driver element 50 and driving voltage transformation unit 60 so that power switch pipe 40 is operated under the driving of the first driving voltage V1 according to voltage zero-crossing signal，And main control unit 70 controls to drive voltage transformation unit 60 to quit work when the collector voltage of power switch pipe 40 oscillates to minimum such as zero，And simultaneously by controlling driver element 50 so that power switch pipe 40 is operated under the driving of the second driving voltage V2，Wherein，Second driving voltage V2 is more than the first driving voltage V1.
Further, according to an embodiment of the present utility model, as shown in Figure 2, oscillogram when running for the heating of electromagnetic heater low-power, the colelctor electrode C pole tension waveform of IGBT, the drive waveforms of IGBT when being followed successively by electric main waveform, low-power heating waveform (employing is lost the mode of ripple and carried out being interrupted heating, and dutycycle is 1/2), the heating of electromagnetic heater low-power from the top down.nullAs can be seen from Figure 2，When electromagnetic heater use lose the mode of ripple be i.e. interrupted mode of heating (heating duty ratio is 1/2) carry out low-power heating time，When stopping heating interval switching to heating interval，Main control unit 70 export first control signal to driver element 50 while，Output second controls signal to drive voltage transformation unit 60，IGBT is turned on and off under the driving of the first driving voltage，The C pole tension realizing IGBT vibrates，And when the C pole tension of IGBT oscillates to minimum main control unit 70 export first control signal to driver element 50 while，Export the 3rd to control signal to drive voltage transformation unit 60，IGBT is turned on and off under the driving of the second driving voltage，Thus the transformation realizing IGBT starts，The mode changing IGBT driving voltage is i.e. used to start IGBT.
According to another embodiment of the present utility model, as shown in Figure 3, oscillogram when running for the heating of electromagnetic heater low-power, the colelctor electrode C pole tension waveform of IGBT, the drive waveforms of IGBT when being followed successively by electric main waveform, low-power heating waveform (employing is lost the mode of ripple and carried out being interrupted heating, and dutycycle is 2/3), the heating of electromagnetic heater low-power from the top down.nullAs can be seen from Figure 3，When electromagnetic heater use lose the mode of ripple be i.e. interrupted mode of heating (heating duty ratio is 2/3) carry out low-power heating time，Similarly，When stopping heating interval switching to heating interval，Main control unit 70 export first control signal to driver element 50 while，Output second controls signal to drive voltage transformation unit 60，IGBT is turned on and off under the driving of the first driving voltage，The C pole tension realizing IGBT vibrates，And when the C pole tension of IGBT oscillates to minimum main control unit 70 export first control signal to driver element 50 while，Export the 3rd to control signal to drive voltage transformation unit 60，IGBT is turned on and off under the driving of the second driving voltage，Thus the transformation realizing IGBT starts，The mode changing IGBT driving voltage is i.e. used to start IGBT.
As shown in figures 2 and 3, the work process of power switch pipe 40 such as IGBT includes first time period T1 and the second time period T2, wherein, in first time period T1, the amplitude of the first driving voltage V1 keeps constant or linearly increasing, and the pulse width of the first driving voltage V1 is incremented by or wide；Amplitude at the second time period T2, the second driving voltage V2 keeps constant, and the pulse width of the second driving voltage V2 is incremented by or wide.I.e. saying, the driving voltage of IGBT can be to maintain the V2 that the constant V1 of amplitude changes to keep amplitude constant under the effect of driver element 50 and driving voltage transformation unit 60, as shown in Figure 4 A；Can also be the linear change of V1 to V2, as shown in Figure 4 B；Or the multiple spot changing value within V1 to V2 is worth.Further, it is incremented by or wide by the pulse width controlling the first driving voltage and the second driving voltage, gently controls the electric current of IGBT, such that it is able to be reduced as far as the dash current of IGBT, it is to avoid IGBT damages.
Further, when the gate drive voltage of IGBT is V1, IGBT is operated in magnifying state, and i.e. in first time period T1, power switch pipe such as IGBT is operated in magnifying state；When the gate drive voltage of IGBT is V2, IGBT is operated on off state, and i.e. at the second time period T2, power switch pipe such as IGBT is operated on off state.And when the gate drive voltage of IGBT is V1, IGBT is operated in magnifying state, the electric current now by IGBT is relevant to the size of driving voltage V1.
In embodiment of the present utility model, as shown in Figure 2 or Figure 3, at the zero crossing of alternating current power supply, the collector voltage of power switch pipe such as IGBT oscillates to minimum and such as oscillates to zero.
Specifically, in first time period T1, main control unit 70 exports first and controls signal to driver element 50, output second simultaneously controls signal to drive voltage transformation unit 60, so that power switch pipe is operated under amplitude keeps the driving of constant the first driving voltage V1, the collector voltage of power switch pipe carries out vibration and diminishes；At the second time period T2, main control unit 70 exports first and controls signal to driver element 50 so that power switch pipe is operated under the driving of the second driving voltage V2, output the 3rd simultaneously controls signal to drive voltage transformation unit 60, drive the audion cut-off in voltage transformation unit 60, so that driving voltage transformation unit to quit work.
According to an embodiment of the present utility model, the first control signal can be PPG pulse, and the second control signal can be high level signal, and the 3rd control signal can be low level signal.
Specifically, as shown in Figure 5, voltage transformation unit 60 is driven to include: the first resistance R1, the first audion Q1, the second resistance R2 and the 3rd resistance R3, wherein, one end of first resistance R1 is connected with main control unit 70, the base stage of the first audion Q1 is connected with the other end of the first resistance R1, the grounded emitter of the first audion Q2, second resistance R2 is connected between base stage and the emitter stage of the first audion Q1, one end of first resistance R2 is connected with the colelctor electrode of the first audion Q1, and the other end of the 3rd resistance R3 is connected with the gate pole of the drive end such as IGBT driving switching tube 40.
And, as it is shown in figure 5, driver element 50 includes: the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10 and the second audion Q2, the 3rd audion Q3, the 4th audion Q4, the 5th audion Q5.One end of 4th resistance R4 is connected with main control unit 70, one end of 5th resistance R5 is connected with one end and the main control unit 70 of the 4th resistance R4 respectively, the other end ground connection of the 5th resistance R5, the base stage of the second audion Q2 is connected with the other end of the 4th resistance R4, the grounded emitter of the second audion Q2, the colelctor electrode of the second audion Q2 is connected with the power vd D of predeterminated voltage by the 6th resistance R6；nullThe base stage of the 3rd audion Q3 is connected with the colelctor electrode of the second audion Q2，The grounded emitter of the 3rd audion Q3，The colelctor electrode of the 3rd audion Q3 is connected with the power vd D of predeterminated voltage by the 7th resistance R7，The base stage of the 4th audion Q4 is connected with the emitter stage of the 3rd audion Q3，The colelctor electrode of the 4th audion Q4 is connected with the power vd D of predeterminated voltage by the 8th resistance R8，The base stage of the 5th audion Q5 is connected with the base stage of the 4th audion Q4，The grounded collector of the 5th audion Q5，One end of 9th resistance R9 is connected with the emitter stage of the 5th audion Q5，The other end of the 9th resistance R9 and the emitter stage of the 4th audion Q4 are connected，One end of tenth resistance R10 is connected with the emitter stage of the 4th audion Q4 and the other end of the 9th resistance R9 respectively，The other end of the tenth resistance R10 is connected with the gate pole of the drive end such as IGBT of power switch pipe 40.
Specifically, in embodiment of the present utility model, voltage transformation unit 60 is driven i.e. to add resistance R1, R2, R3 and audion Q1 by increasing, so when control IGBT startup is opened and heated so that electromagnetic heater, in the T1 stage, main control chip sends PPG pulse to driver element 50, it is simultaneously emitted by high level signal to resistance R1, Q1 is made to turn on, now due to resistance R3 dividing potential drop, nowThe driving voltage of point is V1, and IGBT turns on and off under the driving of V1 so that the C pole tension of IGBT vibrates；In the T2 stage, main control chip sends PPG pulse to driver element 50, is simultaneously emitted by low level signal to resistance R1, makes Q1 end, drive voltage transformation unit 60 to stop the driving voltage effect to IGBT, nowThe driving voltage of point is V2, and maintains the level of V2 at the driving voltage of T2 stage IGBT always, and electromagnetic heater heats.
Therefore, the heating control circuit of the electromagnetic heater of this utility model embodiment drives voltage transformation unit 60 by increasing, and when IGBT is in the T1 stage started, uses the first driving voltage V1 to drive work, when being in T2 stage, the second driving voltage V2 is used to drive work.During because IGBT starts, due to the existence of filter capacitor C1, now the C pole tension of IGBT is not 0, for 1.4 times of the magnitude of voltage after alternating current power supply rectifying and wave-filtering, about AC supply voltage.And when the driving voltage of IGBT is V1, IGBT is operated in magnifying state, the current value then flowing through IGBT is much smaller than switching current much smaller than the current value under the IGBT on off state under V2 voltage conditions, the amplification electric current i.e. flowing through IGBT.So this utility model uses IGBT transformation to start so that the electric current of opening of IGBT reduces, and can reduce IGBT and firmly open the infringement brought, and that can reduce IGBT opens noise simultaneously.
According to an embodiment of the present utility model, as shown in Figure 5, the heating control circuit of above-mentioned electromagnetic heater also includes the first stabilivolt Z1 and the 11st resistance R11, the anode of the first stabilivolt Z1 be connected with the emitter stage of IGBT after ground connection, the negative electrode of the first stabilivolt Z1 is connected with the gate pole of IGBT, and the 11st resistance R11 and the first stabilivolt Z1 is in parallel.
In embodiment of the present utility model, electromagnetic heater can be the electromagnetic product such as electromagnetic oven, prevention electromagnetic pressure cooker or electromagnetic rice cooker.
nullThe heating control circuit of the electromagnetic heater according to this utility model embodiment，By increasing the driving voltage driving voltage transformation unit to change power switch pipe，So main control unit judges before the zero crossing of alternating current power supply by controlling driver element and driving voltage transformation unit so that power switch pipe is operated under the driving of the first driving voltage according to voltage zero-crossing signal，And main control unit controls to drive voltage transformation unit to quit work when the collector voltage of power switch pipe oscillates to minimum，And by controlling driver element so that power switch pipe is operated under the driving of the second driving voltage，Thus in the way of transformation driving, realize power switch pipe when electromagnetic heater heats and start open-minded，The electric current of opening making power switch pipe reduces，Power switch pipe can be reduced and firmly open the infringement brought，The most also can reduce and open noise，Avoid power switch pipe heating serious，Improve the operational reliability of electromagnetic heater，And the heating power scope of electromagnetic heater can be widened.
Fig. 6 is the flow chart of the low-power method for heating and controlling of the electromagnetic heater according to this utility model embodiment.Wherein, this electromagnetic heater includes resonance heating unit, the power switch pipe carrying out resonant operational for controlling described resonance heating unit, the driver element driving described power switch pipe to turn on and off, the driving voltage transformation unit of driving voltage that changes described power switch pipe.As shown in Figure 6, the low-power method for heating and controlling of this electromagnetic heater comprises the following steps:
S1, when receiving low-power heating instructions, uses the mode losing ripple to control power switch pipe so that electromagnetic heater carries out being interrupted heating.
According to an embodiment of the present utility model, as shown in Figure 2 or Figure 3, the mode losing ripple can be used to control electromagnetic heater and carry out low-power heating, dutycycle is 1/2 or 2/3.Such as, when heating power is less than or equal to 1000W, main control chip is defaulted as low power state, is otherwise high power state.When user control electromagnetic heater run certain small-power (such as 600W) heating time, main control chip uses to be lost the mode of ripple and processes, and abandons the waveform of alternating current power supply 1/2 or 1/3, it is achieved electromagnetic heater low-power heats.
S2, detection is input to the voltage zero-crossing signal of the alternating current power supply of electromagnetic heater.Such as, the voltage over zero signal of alternating current power supply can be detected by voltage zero-cross detector unit.
S3, when control electromagnetic heater switches to heating interval from stopping heating interval, judge before the zero crossing of alternating current power supply by controlling driver element and driving voltage transformation unit so that power switch pipe is operated under the driving of the first driving voltage according to voltage zero-crossing signal, and control to drive voltage transformation unit to quit work when the collector voltage of power switch pipe oscillates to minimum, simultaneously by controlling driver element so that power switch pipe is operated under the driving of the second driving voltage, wherein, the second driving voltage is more than the first driving voltage.I.e. say, when switching to heating interval from stopping heating interval every time, use the mode of the driving voltage changing power switch pipe such as IGBT to start IGBT and heat, the dash current value of IGBT can be reduced, reduce switch noise.
According to an embodiment of the present utility model, as shown in Figure 2 or Figure 3, the work process of power switch pipe such as IGBT includes first time period T1 and the second time period T2, wherein, in first time period T1, the amplitude of the first driving voltage V1 keeps constant or linearly increasing, and the pulse width of the first driving voltage V1 is incremented by or wide；Amplitude at the second time period T2, the second driving voltage V2 keeps constant, and the pulse width of the second driving voltage V2 is incremented by or wide.I.e. saying, the driving voltage of IGBT can be to maintain the V2 that the constant V1 of amplitude changes to keep amplitude constant under the effect of driver element and driving voltage transformation unit, as shown in Figure 4 A；Can also be the linear change of V1 to V2, as shown in Figure 4 B；Or the multiple spot changing value within V1 to V2 is worth.Further, it is incremented by or wide by the pulse width controlling the first driving voltage and the second driving voltage, gently controls the electric current of IGBT, such that it is able to be reduced as far as the dash current of IGBT, it is to avoid IGBT damages.
Further, when the gate drive voltage of IGBT is V1, IGBT is operated in magnifying state, and i.e. in first time period T1, power switch pipe such as IGBT is operated in magnifying state；When the gate drive voltage of IGBT is V2, IGBT is operated on off state, and i.e. at the second time period T2, power switch pipe such as IGBT is operated on off state.And when the gate drive voltage of IGBT is V1, IGBT is operated in magnifying state, the electric current now by IGBT is relevant to the size of driving voltage V1.
In embodiment of the present utility model, as shown in Figure 2 or Figure 3, at the zero crossing of alternating current power supply, the collector voltage of power switch pipe such as IGBT oscillates to minimum and such as oscillates to zero.
Specifically, in first time period T1, output first controls signal to driver element, output second simultaneously controls signal to drive voltage transformation unit, so that power switch pipe is operated under amplitude keeps the driving of constant the first driving voltage V1, the collector voltage of power switch pipe carries out vibration and diminishes；At the second time period T2, output first controls signal to driver element so that power switch pipe is operated under the driving of the second driving voltage V2, output the 3rd simultaneously controls signal to drive voltage transformation unit, drives the audion cut-off in voltage transformation unit, so that driving voltage transformation unit to quit work.
According to an embodiment of the present utility model, the first control signal can be PPG pulse, and the second control signal can be high level signal, and the 3rd control signal can be low level signal.
It is to say, in embodiment of the present utility model, when control electromagnetic heater runs with certain heating power such as 600W, the mode being interrupted heating can be used, realize low-power heating.Stopping heating interval, owing to filter capacitor C1 exists, the C pole tension of IGBT maintains the magnitude of voltage after alternating current power supply rectifying and wave-filtering.When B point before the voltage over zero of alternating current power supply starts, using driving voltage is that V1 starts, and makes IGBT turn on, and multiple PPG pulses make oscillation circuit produce vibration, and the C pole tension vibration of IGBT diminishes.IGBT driving pulse amplitude is V1, pulse width is the pulse width of PPG, the width of PPG can be set constant or increase in regularity, after multiple vibrations, when the C pole tension arriving the voltage over zero C i.e. IGBT of point oscillates to minimum, the voltage making electric capacity C1 is close to 0V, the startup stage of now, T1 terminates, entering back into the T2 stage, the driving voltage of IGBT is changed into V2, IGBT and is in normal on off state, hereafter the driving voltage maintaining IGBT is V2, its pulse width is constant or adds and subtracts in regularity, and when next zero crossing D point, closes IGBT and drive.
Therefore, when using the mode losing ripple to control the heating of electromagnetic heater low-power, the mode that change IGBT can be used to start voltage starts IGBT heating, and IGBT startup stage (T1 stage), the amplitude of IGBT driving voltage V1 is constant or variable, and pulse width is constant or increases, in the formal heating period (T2 stage) according to certain regularity, the amplitude perseverance of IGBT driving voltage is V2, but pulse width is constant or adds and subtracts according to certain Changing Pattern.Wherein, the startup stage of IGBT, point is before the voltage over zero of alternating current power supply, to ensure that when the voltage zero-cross of the alternating current power supply voltage of electric capacity C1 can decline the C pole tension of the i.e. IGBT of minimum and oscillate to close to 0V, after the voltage over zero of alternating current power supply, the driving voltage of IGBT is V2 simultaneously.It is possible to make the electric current of opening of IGBT reduce, can reduce IGBT and firmly open the infringement brought, that can reduce IGBT opens noise simultaneously.
nullThe low-power method for heating and controlling of the electromagnetic heater according to this utility model embodiment，Use the mode losing ripple to control power switch pipe when receiving low-power heating instructions so that electromagnetic heater carries out being interrupted heating，And when control electromagnetic heater switches to heating interval from stopping heating interval，Judge before the zero crossing of alternating current power supply by controlling driver element and driving voltage transformation unit so that power switch pipe is operated under the driving of the first driving voltage according to voltage zero-crossing signal，And control to drive voltage transformation unit to quit work when the collector voltage of power switch pipe oscillates to minimum，Simultaneously by controlling driver element so that power switch pipe is operated under the driving of the second driving voltage，Thus in the way of transformation driving, realize power switch pipe when electromagnetic heater enters heating interval and start open-minded，The electric current of opening making power switch pipe reduces，Power switch pipe can be reduced and firmly open the infringement brought，The most also can reduce and open noise，Avoid power switch pipe heating serious，Improve the operational reliability of electromagnetic heater，And the heating power scope of electromagnetic heater can be widened.
Additionally, embodiment of the present utility model also proposed a kind of electromagnetic heater, it includes the heating control circuit of above-mentioned electromagnetic heater.
The electromagnetic heater of this utility model embodiment, by increasing the driving voltage driving voltage transformation unit to change power switch pipe in heating control circuit, so in the way of transformation driving, realize power switch pipe when electromagnetic heater enters heating interval and start open-minded, so that the electric current of opening of power switch pipe reduces, power switch pipe can be reduced and firmly open the infringement brought, the most also can reduce and open noise, avoid power switch pipe heating serious, improve operational reliability, and heating power scope can be widened.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " length ", " width ", " thickness ", on " ", D score, " front ", " afterwards ", " left ", " right ", " vertically ", " level ", " push up ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axially ", " radially ", orientation or the position relationship of the instruction such as " circumferential " are based on orientation shown in the drawings or position relationship, it is for only for ease of description this utility model and simplifies description, rather than indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two, three etc., unless otherwise expressly limited specifically.
In this utility model, unless otherwise clearly defined and limited, term " is installed ", " being connected ", " connection ", the term such as " fixing " should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be connection or the interaction relationship of two elements of two element internals, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in this utility model can be understood as the case may be.
In this utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of fisrt feature level height 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, the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means that the specific features, structure, material or the feature that combine this embodiment or example description are contained at least one embodiment of the present utility model or example.In this manual, the schematic representation of above-mentioned term is necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be to combine in one or more embodiments in office or example in an appropriate manner.Additionally, in the case of the most conflicting, the feature of the different embodiments described in this specification or example and different embodiment or example can be combined and combine by those skilled in the art.
Although above it has been shown and described that embodiment of the present utility model, it is understandable that, above-described embodiment is exemplary, it is not intended that to restriction of the present utility model, above-described embodiment can be changed in the range of this utility model, revises, replace and modification by those of ordinary skill in the art.
Claims (10)
1. the heating control circuit of an electromagnetic heater, it is characterised in that including:
Voltage zero-cross detector unit, described voltage zero-cross detector unit is input to the voltage zero-crossing signal of the alternating current power supply of electromagnetic heater for detection；
Resonance heating unit；
Rectification filtering unit, described rectification filtering unit carries out resonance heating unit described in rectifying and wave-filtering treatment and supplied to described alternating current power supply；
The power switch pipe of resonant operational is carried out for controlling described resonance heating unit；
Driver element, described driver element is connected with the drive end of described power switch pipe to drive turning on and off of described power switch pipe；
Drive voltage transformation unit, described driving voltage transformation unit be connected with the drive end of described power switch pipe with change described power switch pipe driving voltage；
Main control unit, described main control unit respectively with described voltage zero-cross detector unit, described driver element is connected with described driving voltage transformation unit, described main control unit judges before the zero crossing of described alternating current power supply by controlling described driver element and described driving voltage transformation unit so that described power switch pipe is operated under the driving of the first driving voltage according to described voltage zero-crossing signal, and the described driving voltage transformation unit of described main control unit control quits work when the collector voltage of described power switch pipe oscillates to minimum, and by controlling described driver element so that described power switch pipe is operated under the driving of the second driving voltage, wherein, described second driving voltage is more than described first driving voltage.
The heating control circuit of electromagnetic heater the most according to claim 1, it is characterised in that the work process of described power switch pipe includes first time period and the second time period, wherein,
In described first time period, the amplitude of described first driving voltage keeps constant or linearly increasing, and the pulse width of described first driving voltage is incremented by or wide；
In described second time period, the amplitude of described second driving voltage keeps constant, and the pulse width of described second driving voltage is incremented by or wide.
The heating control circuit of electromagnetic heater the most according to claim 2, it is characterised in that in described first time period, described power switch pipe is operated in magnifying state；In described second time period, described power switch pipe is operated on off state.
The heating control circuit of electromagnetic heater the most according to claim 1, it is characterised in that at the zero crossing of described alternating current power supply, the collector voltage of described power switch pipe oscillates to minimum.
The heating control circuit of electromagnetic heater the most according to claim 2, it is characterised in that
In described first time period, described main control unit output first controls signal to described driver element, output second simultaneously controls signal to described driving voltage transformation unit, so that described power switch pipe is operated under amplitude keeps the driving of constant the first driving voltage, the collector voltage of described power switch pipe carries out vibration and diminishes；
In described second time period, described main control unit output described first controls signal to described driver element so that described power switch pipe is operated under the driving of described second driving voltage, and output the 3rd simultaneously controls signal to described driving voltage transformation unit so that described driving voltage transformation unit quits work.
The heating control circuit of electromagnetic heater the most according to claim 5, it is characterized in that, described power switch pipe is IGBT, and described first control signal is PPG pulse, described second control signal is high level signal, and described 3rd control signal is low level signal.
7. according to the heating control circuit of the electromagnetic heater according to any one of claim 1-6, it is characterised in that described driving voltage transformation unit includes:
First resistance, one end of described first resistance is connected with described main control unit；
First audion, the base stage of described first audion is connected with the other end of described first resistance, the grounded emitter of described first audion；
Second resistance, described second resistance is connected between base stage and the emitter stage of described first audion；
3rd resistance, one end of described first resistance is connected with the colelctor electrode of described first audion, and the other end of described 3rd resistance is connected with the drive end of described driving switching tube.
The heating control circuit of electromagnetic heater the most according to claim 7, it is characterised in that described driver element includes:
4th resistance, one end of described 4th resistance is connected with described main control unit；
5th resistance, one end of described 5th resistance is connected with one end and the described main control unit of described 4th resistance respectively, the other end ground connection of described 5th resistance；
Second audion, the base stage of described second audion is connected with the other end of described 4th resistance, the grounded emitter of described second audion, and the colelctor electrode of described second audion is connected with the power supply of predeterminated voltage by the 6th resistance；
3rd audion, the base stage of described 3rd audion is connected with the colelctor electrode of described second audion, the grounded emitter of described 3rd audion, and the colelctor electrode of described 3rd audion is connected with the power supply of described predeterminated voltage by the 7th resistance；
4th audion, the base stage of described 4th audion is connected with the colelctor electrode of described 3rd audion, and the colelctor electrode of described 4th audion is connected with the power supply of described predeterminated voltage by the 8th resistance；
5th audion, the base stage of described 5th audion is connected with the base stage of described 4th audion, the grounded collector of described 5th audion；
9th resistance, one end of described 9th resistance is connected with the emitter stage of described 5th audion, and the other end of described 9th resistance is connected with the emitter stage of described 4th audion；
Tenth resistance, one end of described tenth resistance is connected with the emitter stage of described 4th audion and the other end of described 9th resistance respectively, and the described other end of the tenth resistance is connected with the drive end of described power switch pipe.
The heating control circuit of electromagnetic heater the most according to claim 6, it is characterized in that, also include the first stabilivolt and the 11st resistance, the anode of described first stabilivolt be connected with the emitter stage of described IGBT after ground connection, the negative electrode of described first stabilivolt is connected with the gate pole of described IGBT, and described 11st resistance is in parallel with described first stabilivolt.
10. an electromagnetic heater, it is characterised in that include the heating control circuit according to the electromagnetic heater according to any one of claim 1-9.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620106928.2U CN205430652U (en) | 2016-02-02 | 2016-02-02 | Electromagnetic heating device and heating control circuit thereof |
| EP16888971.5A EP3297396B1 (en) | 2016-02-02 | 2016-05-31 | Electromagnetic heating device and heating control circuit thereof, and low power heating control method |
| JP2018504860A JP6480083B2 (en) | 2016-02-02 | 2016-05-31 | Electromagnetic heating device, heating control circuit thereof, and low power heating control method |
| PCT/CN2016/084172 WO2017133150A1 (en) | 2016-02-02 | 2016-05-31 | Electromagnetic heating device and heating control circuit thereof, and low power heating control method |
| US15/921,396 US10085305B2 (en) | 2016-02-02 | 2018-03-14 | Electromagnetic heating device and heating control circuit thereof, and low power heating control method |
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| CN201620106928.2U CN205430652U (en) | 2016-02-02 | 2016-02-02 | Electromagnetic heating device and heating control circuit thereof |
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