CN104470014B - For step-up/step-down circuit and the control method thereof of electromagnetic heater - Google Patents
For step-up/step-down circuit and the control method thereof of electromagnetic heater Download PDFInfo
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- CN104470014B CN104470014B CN201310430991.2A CN201310430991A CN104470014B CN 104470014 B CN104470014 B CN 104470014B CN 201310430991 A CN201310430991 A CN 201310430991A CN 104470014 B CN104470014 B CN 104470014B
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Abstract
The present invention proposes a kind of step-up/step-down circuit for electromagnetic heater and control method thereof, wherein step-up/step-down circuit comprises: H bridge circuit, comprise an IGBT and the first switching tube, the 2nd IGBT and second switch pipe, the first inductance, the input of H bridge circuit is connected with the output of the rectifier bridge in electromagnetic heater; Be connected in parallel on the first electric capacity of the output of H bridge circuit; Resonance circuit, is connected with the first electric capacity; Controller, is connected respectively with the G utmost point of the 2nd IGBT with the G utmost point of an IGBT, and the dutycycle according to the duty of electromagnetic heater by controlling an IGBT and the 2nd IGBT is to adjust the voltage at the first electric capacity two ends. The present invention adjusts capacitance voltage by the dutycycle of controlling IGBT, thereby the voltage of rising or reduction resonance circuit, so that electromagnetic heater reduces the turn-on consumption of switching device in the time of high voltage low-power, in the time of low-voltage high power, make electromagnetic heater fast lifting power.
Description
Technical field
The present invention relates to living electric apparatus field, particularly a kind of step-up/step-down circuit for electromagnetic heater and control thereofMethod processed.
Background technology
In prior art, in the electromagnetic heater such as electromagnetic oven, apply single tube antiresonant circuit, but, electricityMagnetic heater in the time of high voltage low-power, IGBT(InsulatedGateBipolarTransistor, insulated gate bipolar crystalline substanceBody pipe) turning-on voltage is high, and turn-on consumption is large, and IGBT temperature rise easily damages; Electromagnetic heater is high in low-voltageWhen power,, therefore there are improved needs in power ascension difficulty.
Summary of the invention
Object of the present invention is intended to solve at least to a certain extent one of above-mentioned technological deficiency.
For this reason, one object of the present invention is to propose a kind of step-up/step-down circuit for electromagnetic heater, and this is used forThe step-up/step-down circuit of electromagnetic heater is adjusted capacitance voltage by the dutycycle of controlling IGBT, thereby raises or reduce humorousThe voltage of circuit that shakes, and then make electromagnetic heater in the time of high voltage low-power, reduce the turning-on voltage of switching device, fallLow turn-on consumption, reduces MOS switch dissipation, improves the life-span of switching device, in the time of low-voltage high power, electromagnetism is addedHot charging is put quick acquisition energy, hoisting power.
Another object of the present invention is to propose a kind of control method of the step-up/step-down circuit for electromagnetic heater.
For achieving the above object, the present invention proposes a kind of step-up/step-down circuit for electromagnetic heater, comprising: H bridgeCircuit, described H bridge circuit comprises an IGBT and the first switching tube, the 2nd IGBT and second switch pipe, firstInductance, the input of described H bridge circuit is connected with the output of the rectifier bridge in described electromagnetic heater; The first electricityHold, described the first Capacitance parallel connection is at the output of described H bridge circuit; And controller, described controller and describedThe G utmost point of one IGBT is connected respectively with the G utmost point of described the 2nd IGBT, and described controller fills according to described Electromagnetic HeatingThe dutycycle of the duty of putting by controlling a described IGBT and described the 2nd IGBT is to adjust described the first electric capacityThe voltage at two ends.
According to the step-up/step-down circuit for electromagnetic heater of the embodiment of the present invention, by controlling an IGBT and secondThe dutycycle of IGBT is to adjust the voltage at the first electric capacity two ends, thus the voltage of rising or reduction resonance circuit, and then makeElectromagnetic heater reduces the turning-on voltage of switching device in the time of high voltage low-power, reduces turn-on consumption, reduces switchDevice heating, the life-span of improving switching device, in the time of low-voltage high power, make electromagnetic heater obtain fast energy,Hoisting power. Wherein, in one embodiment of the invention, when described electromagnetic heater in the first predeterminated voltage,When the duty of the first default power, step-up/step-down circuit enters step-down mode of operation described in described controller control; WhenWhen described electromagnetic heater is preset the duty of power in the second predeterminated voltage, second, described controller controlDescribed step-up/step-down circuit enters the mode of operation of boosting, and wherein, described the second predeterminated voltage is less than described the first predeterminated voltage,The described second default power is greater than the described first default power.
Preferably, in one embodiment of the invention, described the first switching tube and described second switch pipe are respectively twoOne of utmost point pipe, IGBT, controllable silicon or metal-oxide-semiconductor.
Further, in one embodiment of the invention, when described the first switching tube is the first diode, describedWhen two switching tubes are the 3rd IGBT, the anode of described the first diode is connected with the negative output terminal of described rectifier bridge, described inThe negative electrode of the first diode is extremely connected with the E of a described IGBT, the negative electrode of described the first diode and described firstBetween the E utmost point of IGBT, have first node, the C utmost point of a described IGBT is connected with the positive output end of described rectifier bridge,The C utmost point of described the 3rd IGBT is connected with one end of described the first electric capacity, the E utmost point of described the 3rd IGBT and describedThe C of two IGBT is extremely connected, between the E utmost point of described the 3rd IGBT and the C utmost point of described the 2nd IGBT, has secondNode, the E utmost point of described the 2nd IGBT respectively with the other end of described the first electric capacity and the negative output terminal of described rectifier bridgeBe connected, described the first inductance is connected between described first node and described Section Point.
Further, in one embodiment of the invention, when described the first switching tube is the first diode, describedWhen two switching tubes are the 3rd IGBT, the anode of described the first diode is connected with the negative output terminal of described rectifier bridge, described inThe negative electrode of the first diode is extremely connected with the E of a described IGBT, the negative electrode of described the first diode and described firstBetween the E utmost point of IGBT, have first node, the C utmost point of a described IGBT is connected with the positive output end of described rectifier bridge,The G utmost point of described the 3rd IGBT is connected with described controller, the C utmost point of described the 3rd IGBT and described the first electric capacityOne end is connected, and the E utmost point of described the 3rd IGBT is extremely connected with the C of described the 2nd IGBT, the E of described the 3rd IGBTBetween the C utmost point of the utmost point and described the 2nd IGBT, have Section Point, the E utmost point of described the 2nd IGBT is respectively with describedThe other end of one electric capacity is connected with the negative output terminal of described rectifier bridge, described the first inductance be connected to described first node andBetween described Section Point.
In addition, in one embodiment of the invention, when described the first switching tube is the first diode, described second opensClose pipe while being the second diode, the anode of described the first diode is connected with the negative output terminal of described rectifier bridge, and described theThe negative electrode of one diode is extremely connected with the E of a described IGBT, the negative electrode of described the first diode and described firstBetween the E utmost point of IGBT, have first node, the C utmost point of a described IGBT is connected with the positive output end of described rectifier bridge,The negative electrode of described the second diode is connected with one end of described the first electric capacity, the anode of described the second diode and describedThe C of two IGBT is extremely connected, between the anode of described the second diode and the C utmost point of described the 2nd IGBT, has the 3rdNode, the E utmost point of described the 2nd IGBT respectively with the other end of described the first electric capacity and the negative output terminal of described rectifier bridgeBe connected, described the first inductance is connected between described first node and described the 3rd node.
Wherein, in one embodiment of the invention, the described step-up/step-down circuit for electromagnetic heater also comprisesChoking-winding, described choking-winding is connected between the positive output end of described rectifier bridge and the C utmost point of a described IGBT.
Further, in one embodiment of the invention, described resonance circuit comprises the second electric capacity and resonance in parallelCoil, one end of described the second electric capacity is connected with one end of described the first electric capacity respectively with one end of resonance coil, described inThe other end of the second electric capacity is connected with the switching device in described electromagnetic heater respectively with the other end of resonance coil.
Wherein, in one embodiment of the invention, described switching device is the 4th IGBT, described the 4th IGBT'sThe C utmost point is connected respectively with the other end of described the second electric capacity and the other end of resonance coil, the G utmost point of described the 4th IGBTBe connected with described controller, the E utmost point of described the 4th IGBT is connected with the other end of described the first electric capacity.
In addition, the present invention also proposes a kind of as the control of the step-up/step-down circuit for electromagnetic heater of above-described embodimentMethod, comprises the following steps:
Obtain the duty of described electromagnetic heater;
Pass through to control the IGBT and second in described H bridge circuit according to the duty of described electromagnetic heaterThe dutycycle of IGBT is to adjust the voltage at described the first electric capacity two ends.
According to the control method of the step-up/step-down circuit for electromagnetic heater of the embodiment of the present invention, according to Electromagnetic HeatingThe dutycycle of the duty of device by controlling an IGBT and the 2nd IGBT is to adjust the electricity at the first electric capacity two endsPress, thus the voltage of rising or reduction resonance circuit, and then electromagnetic heater is reduced out in the time of high voltage low-powerClose the turning-on voltage of device, reduce turn-on consumption, reduce MOS switch dissipation, improve the life-span of switching device, lowWhen voltage high power, make electromagnetic heater obtain fast energy, hoisting power. In addition, this control method is simple and reliable,Be easy to realize.
In one embodiment of the invention, the duty of described electromagnetic heater comprises described electromagnetic heaterOperating voltage and operating power, wherein, when the operating voltage of described electromagnetic heater higher than predetermined voltage threshold andThe operating power of described electromagnetic heater during lower than default power threshold, is controlled described H bridge circuit and is entered step-down workPattern; When the operating voltage of described electromagnetic heater is not higher than described predetermined voltage threshold and described electromagnetic heaterOperating power while being not less than described default power threshold, control described H bridge circuit and enter the mode of operation of boosting.
In one embodiment of the invention, described predetermined voltage threshold is 200-220V, and described default power threshold is1000-1400W。
The aspect that the present invention is additional and advantage in the following description part provide, and part will become from the following descriptionObtain obviously, or recognize by practice of the present invention.
Brief description of the drawings
The present invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments brightAobvious and easy understanding, wherein:
Fig. 1 is the circuit diagram for the step-up/step-down circuit of electromagnetic heater according to an embodiment of the invention;
Fig. 2 is the circuit diagram for the step-up/step-down circuit of electromagnetic heater in accordance with another embodiment of the present invention;
Fig. 3 is according to the flow chart of the control method of the step-up/step-down circuit for electromagnetic heater of the embodiment of the present invention.
Reference numeral:
H bridge circuit 1000, controller 2000, rectifier bridge 3000, resonance circuit 4000, switching device 5000, theOne IGBT101, the 2nd IGBT102, the 3rd IGBT103, the 4th IGBT104, the first switching tube 201, secondSwitching tube 202, the first inductance L 1, choking-winding L2, resonance coil L3, the first diode D1, the second diodeD2, the first capacitor C 1, the second capacitor C 2.
Detailed description of the invention
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, wherein from start to finishSame or similar label represents same or similar element or has the element of identical or similar functions. Below by ginsengThe embodiment that examines accompanying drawing description is exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
Disclosing below provides many different embodiment or example to be used for realizing different structure of the present invention. For letterChange of the present invention openly, hereinafter the parts to specific examples and setting are described. Certainly, they are only example,And object does not lie in restriction the present invention. In addition, the present invention can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and object clearly, itself do not indicate between discussed various embodiment and/or settingRelation. In addition the various specific technique the invention provides and the example of material, but ordinary skill people,Member can recognize the property of can be applicable to of other techniques and/or the use of other materials. In addition, the first spy described belowLevy Second Characteristic it " on " structure can comprise that the first and second Characteristics creations are the direct embodiment of contact, also canTo comprise the embodiment of other Characteristics creation between the first and second features, such the first and second features may be notIt is direct contact.
In description of the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected "," connection " should be interpreted broadly, and for example, can be mechanical connection or electrical connection, can be also the company of two element internalsLogical, can be to be directly connected, also can indirectly be connected by intermediary, for those of ordinary skill in the art andSay, can understand as the case may be the concrete meaning of above-mentioned term.
Describe with reference to the accompanying drawings according to the embodiment of the present invention propose the step-up/step-down circuit for electromagnetic heater andIts control method.
First the step-up/step-down circuit for the electromagnetic heater embodiment of the present invention being proposed is described.
As shown in Figure 1 and Figure 2, according to the step-up/step-down circuit for electromagnetic heater of the embodiment of the present invention, comprising:H bridge circuit 1000, the first capacitor C 1, resonance circuit 4000 and controller 2000.
Particularly, H bridge circuit 1000 comprises: an IGBT101 and the first switching tube 201, the 2nd IGBT102With second switch pipe 202, the first inductance L 1, the rectifier bridge in input and the electromagnetic heater of H bridge circuit 10003000 output is connected. The first capacitor C 1 is connected in parallel on the output of H bridge circuit 1000. Resonance circuit 4000 withThe first capacitor C 1 is connected, and the first capacitor C 1 provides power supply for resonance circuit 4000. Controller 2000 and an IGBT101The G utmost point be connected respectively with the G utmost point of the 2nd IGBT102, controller 2000 is according to the duty of electromagnetic heaterDutycycle by controlling an IGBT101 and the 2nd IGBT102 is to adjust the voltage at the first capacitor C 1 two ends.
Wherein, in one embodiment of the invention, when electromagnetic heater is preset in the first predeterminated voltage, firstWhen the duty of power, controller 2000 is controlled H bridge circuit 1000 and is entered step-down mode of operation; Work as Electromagnetic HeatingWhen device is preset the duty of power in the second predeterminated voltage, second, controller 2000 is controlled H bridge circuit 1000Enter the mode of operation of boosting. Wherein, the second predeterminated voltage is less than the first predeterminated voltage, and the second default power is greater than firstDefault power. That is to say, controller 2000 is according to the working state control H bridge circuit 1000 of electromagnetic heaterEnter corresponding mode of operation. Particularly, in the time that electromagnetic heater is operated in high voltage, low power state, controlDevice 2000 is controlled H bridge circuit 1000 and is entered step-down mode of operation, when electromagnetic heater is operated in low-voltage, Gao GongWhen rate state, controller 2000 is controlled H bridge circuit 1000 and is entered the mode of operation of boosting.
Preferably, in one embodiment of the invention, the first switching tube 201 and second switch pipe 202 are respectively twoOne of utmost point pipe, IGBT, controllable silicon or metal-oxide-semiconductor.
In one embodiment of the invention, as shown in Figure 1, when the first switching tube 201 is the first diode D1, theWhen two switching tubes 202 are the 3rd IGBT103, the negative output terminal phase of the anode of the first diode D1 and rectifier bridge 3000Connect, the negative electrode of the first diode D1 is extremely connected with the E of an IGBT101, the negative electrode of the first diode D1 and theBetween the E utmost point of one IGBT101, there is first node a, the C utmost point of an IGBT101 and rectifier bridge 3000 just defeatedGo out end and be connected, the G utmost point of the 3rd IGBT103 is connected with controller 2000, the C utmost point of the 3rd IGBT103 and the first electricityThe one end that holds C1 is connected, and the E utmost point of the 3rd IGBT103 is extremely connected with the C of the 2nd IGBT102, the 3rd IGBT103The E utmost point and the C utmost point of the 2nd IGBT102 between there is Section Point b, the E utmost point of the 2nd IGBT102 is respectively with firstThe other end of capacitor C 1 is connected with the negative output terminal of rectifier bridge 3000, and the first inductance L 1 is connected to first node a andBetween two node b. It should be noted that, in the time that second switch pipe 202 is the 3rd IGBT103, the 3rd IGBT103The G utmost point also can not be connected with controller 2000, unsettled, now the 3rd IGBT103 uncontrolled device 2000Control.
In another embodiment of the present invention, as shown in Figure 2, when the first switch 201 is the first diode D1, theWhen two switching tubes are the second diode D2, the anode of the first diode D1 is connected with the negative output terminal of rectifier bridge 3000,The negative electrode of the first diode D1 is extremely connected with the E of an IGBT101, the negative electrode of the first diode D1 and firstBetween the E utmost point of IGBT101, there is first node a, the C utmost point of an IGBT101 and the positive output of rectifier bridge 3000End be connected, the negative electrode of the second diode D2 is connected with one end of the first capacitor C 1, the anode of the second diode D2 andThe C of the 2nd IGBT102 is extremely connected, has between the anode of the second diode D2 and the C utmost point of the 2nd IGBT102Three node c, the E utmost point of the 2nd IGBT102 respectively with the negative output of the other end and the rectifier bridge 3000 of the first capacitor C 1End is connected, and the first inductance L 1 is connected between first node a and the 3rd node c.
Further, as shown in Figure 1, 2, in one embodiment of the invention, above-mentioned for electromagnetic heaterStep-up/step-down circuit also comprise choking-winding L2, choking-winding L2 is connected to the positive output end and first of rectifier bridge 3000Between the C utmost point of IGBT101. Choking-winding L2 has the characteristic that suppresses curent change.
In addition, as shown in Figure 1, 2, in one embodiment of the invention, resonance circuit 4000 comprises in parallel theTwo capacitor C 2 and resonance coil L3, one end of one end of the second capacitor C 2 and resonance coil L3 respectively with the first electric capacityOne end of C1 is connected, the other end of the other end of the second capacitor C 2 and resonance coil L3 respectively with electromagnetic heater inSwitching device 5000 be connected.
Preferably, switching device 5000 can be the 4th IGBT104, the C utmost point of the 4th IGBT104 and the second electric capacityThe other end of C2 is connected respectively with the other end of resonance coil L3, the G utmost point of the 4th IGBT104 and controller 2000Be connected, the E utmost point of the 4th IGBT104 is connected with the other end of the first capacitor C 1.
The work of the step-up/step-down circuit for electromagnetic heater with the embodiment shown in Fig. 1, the present invention being proposed belowBe described as process. In this example, the first switching tube 201 is the first diode D1, and second switch pipe 202 isThe 3rd IGBT103, the G utmost point of the 3rd IGBT103 is connected with controller 2000, i.e. the controlled device of the 3rd IGBT1032000 control.
Specifically, when electromagnetic heater is in the time that the first predeterminated voltage, first is preset the duty of power, controlDevice 2000 for example enters step-down mode of operation for MCU controls H bridge circuit 1000, when electromagnetic heater is operated inWhen high voltage, low power state, controller 2000 is controlled H bridge circuit 1000 and is entered step-down mode of operation, now,The course of work of step-up/step-down circuit is: it is open-minded that controller 2000 is controlled an IGBT101, and the 3rd IGBT103 turn-offs, theTwo IGBT102 turn-off, and the direct current that rectifier bridge 3000 is exported flows through an IGBT101, choking-winding L2, second switchManaging 202 pairs of the first capacitor C 1 charges. Control an IGBT101 when controller 2000 and turn-off, the 3rd IGBT103 turn-offs,When the 2nd IGBT102 turn-offs, in the first inductance L 1, electric current keeps the sense of current constant, and electric current flows through the 3rd IGBT103Fly-wheel diode, the first capacitor C 1, the first switching tube 201, form loop, the first capacitor C 1 is discharged, voltage drop.In sum, the voltage of Duty ratio control first capacitor C 1 of controller 2000 by controlling an IGBT101 is realized step-downFunction. In the time that electromagnetic heater is operated in high voltage, low power state, controller 2000 is by controlling an IGBT101Dutycycle realize the decline of the first capacitor C 1 both end voltage, reduce the resonance that resonance coil L3 and the second capacitor C 2 formThe vibration initial voltage of circuit 4000, makes oscillating voltage can drop to a lower voltage, thereby reduces switching device5000 as the turning-on voltage of the 4th IGBT104, reduces turn-on consumption.
When electromagnetic heater is in the time that the second predeterminated voltage, second is preset the duty of power, controller 2000 is controlledH bridge circuit 1000 processed enters in the mode of operation of boosting. When electromagnetic heater is operated in low-voltage, high power stateTime, controller 2000 is controlled H bridge circuit 1000 and is entered the mode of operation of boosting, now, and the course of work of step-up/step-down circuitFor: it is lasting open-minded that controller 2000 is controlled an IGBT101, and control the 2nd IGBT102 when controller 2000 and turn-off,When the 3rd IGBT103 turn-offs, in the first inductance L 1, the energy flow of storage is to the first capacitor C 1, to the first capacitor C 1Charging; When controller 2000, to control the 2nd IGBT102 open-minded, and when the 3rd IGBT103 turn-offs, electric current flows through firstIGBT101, the first inductance L 1, the 2nd IGBT102. Owing to continuing the first electricity in opening process at an IGBT101Sense L1 electric current sharply rises, and the energy that the first inductance L 1 stores is large, can effectively charge to the first capacitor C 1, makes theOne capacitor C 1 voltage fast lifting. Controller 2000 is by controlling the dutycycle adjustment of the 2nd IGBT102 in sumThe voltage of the first capacitor C 1, realizes boost function. In the time that electromagnetic heater is operated in low-voltage, high power state,Controller 2000 makes resonance coil by controlling the raise voltage at the first capacitor C 1 two ends of the dutycycle of the 2nd IGBT102The resonance circuit 4000 that L3 and the second capacitor C 2 form obtains more energy in single cycle of oscillation, and electromagnetism is addedHot charging is put the power that reaches higher.
According to the step-up/step-down circuit for electromagnetic heater of the embodiment of the present invention, by controlling an IGBT and secondThe dutycycle of IGBT is to adjust the voltage at the first electric capacity two ends, thus the voltage of rising or reduction resonance circuit, and then makeElectromagnetic heater reduces the turning-on voltage of switching device in the time of high voltage low-power, reduces turn-on consumption, reduces switchDevice heating, the life-span of improving switching device, in the time of low-voltage high power, make electromagnetic heater obtain fast energy,Hoisting power.
In addition, the present invention also proposes a kind of as the control of the step-up/step-down circuit for electromagnetic heater of above-described embodimentMethod, as shown in Figure 3, this control method that is used for the step-up/step-down circuit of electromagnetic heater comprises the following steps:
S301, obtains the duty of electromagnetic heater.
S302, passes through to control the IGBT and second in H bridge circuit according to the duty of electromagnetic heaterThe dutycycle of IGBT is to adjust the voltage at the first electric capacity two ends.
Specifically, controller 2000, after obtaining the duty of electromagnetic heater, and carries out dutyJudgement, with according to the duty of electromagnetic heater by control an IGBT101 in H bridge circuit 1000 andThe dutycycle of the 2nd IGBT102 is to adjust the voltage at the first capacitor C 1 two ends, thus rising or reduction resonance circuit 4000Voltage.
Further, in one embodiment of the invention, the duty of electromagnetic heater comprises Electromagnetic Heating dressThe operating voltage of putting and operating power, wherein, when the operating voltage of electromagnetic heater is higher than predetermined voltage threshold and electricityThe operating power of magnetic heater during lower than default power threshold, is controlled H bridge circuit and is entered step-down mode of operation; Work as electricityThe operating voltage of magnetic heater is not not less than default merit higher than the operating power of predetermined voltage threshold and electromagnetic heaterWhen rate threshold value, control H bridge circuit and enter the mode of operation of boosting. Preferably, in one embodiment of the invention, pre-If voltage threshold can be 200-220V, default power threshold can be 1000-1400W. Alternatively, predeterminated voltage thresholdValue is 220V, and default power threshold can be 1300W.
Particularly, when the operating voltage of electromagnetic heater higher than the operating power of 220V and electromagnetic heater lower thanWhen 1300W,, in the time that electromagnetic heater is operated in high voltage, low power state, controller 2000 is controlled H bridgeCircuit 1000 enters step-down mode of operation, and controller 2000 is by controlling Duty ratio control the first electricity of an IGBT101Hold the voltage at C1 two ends and realize buck functionality. In the time that electromagnetic heater is operated in high voltage, low power state, controller2000 realize the decline of the first capacitor C 1 both end voltage by controlling the dutycycle of an IGBT101, reduce resonance circuit4000 vibration initial voltage, makes oscillating voltage can drop to a lower voltage, thereby reduces switching device 5000Turning-on voltage, reduces turn-on consumption.
When the operating voltage of electromagnetic heater is not not less than higher than the operating power of 220V and electromagnetic heaterWhen 1300W,, in the time that electromagnetic heater is operated in low-voltage, high power state, controller 2000 is controlled H bridgeCircuit 1000 enters the mode of operation of boosting, and controller 2000 adjusts first by the dutycycle of controlling the 2nd IGBT102The voltage at capacitor C 1 two ends is realized boost function. In the time that electromagnetic heater is operated in low-voltage, high power state, controlDevice 2000 processed makes resonance circuit by controlling the raise voltage at the first capacitor C 1 two ends of the dutycycle of the 2nd IGBT1024000 obtain more energy in single cycle of oscillation, make electromagnetic heater reach higher power.
According to the control method of the step-up/step-down circuit for electromagnetic heater of the embodiment of the present invention, according to Electromagnetic HeatingThe dutycycle of the duty of device by controlling an IGBT and the 2nd IGBT is to adjust the electricity at the first electric capacity two endsPress, thus the voltage of rising or reduction resonance circuit, and then electromagnetic heater is reduced out in the time of high voltage low-powerClose the turning-on voltage of device, reduce turn-on consumption, reduce MOS switch dissipation, improve the life-span of switching device, lowWhen voltage high power, make electromagnetic heater obtain fast energy, hoisting power. In addition, this control method is simple and reliable,Be easy to realize.
In the description of this description, reference term " embodiment ", " some embodiment ", " example ", " specifically showExample " or the description of " some examples " etc. the specific features that means to describe in conjunction with this embodiment or example, structure, material orPerson's feature is contained at least one embodiment of the present invention or example. In this manual, the signal to above-mentioned termProperty statement not necessarily refers to identical embodiment or example. And, the specific features of description, structure, material orFeature can be with suitable mode combination in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, canUnderstand without departing from the principles and spirit of the present invention can to these embodiment carry out multiple variation, amendment,Replace and modification, scope of the present invention is by claims and be equal to and limit.
Claims (12)
1. for a step-up/step-down circuit for electromagnetic heater, it is characterized in that, comprising:
H bridge circuit, described H bridge circuit comprise an IGBT and the first switching tube, the 2nd IGBT and second switch pipe,The first inductance, the input of described H bridge circuit is connected with the output of the rectifier bridge in described electromagnetic heater;
The first electric capacity, described the first Capacitance parallel connection is at the output of described H bridge circuit;
Resonance circuit, described resonance circuit is connected with described the first electric capacity, and described the first electric capacity is that described resonance circuit is carriedPower supply source; And
Controller, described controller is connected respectively with the G utmost point of described the 2nd IGBT with the G utmost point of a described IGBT,Described controller passes through to control a described IGBT and described second according to the duty of described electromagnetic heaterThe dutycycle of IGBT is to adjust the voltage at described the first electric capacity two ends.
2. the step-up/step-down circuit for electromagnetic heater as claimed in claim 1, is characterized in that,
When described electromagnetic heater is in the time that the first predeterminated voltage, first is preset the duty of power, described controlDescribed in device control, H bridge circuit enters step-down mode of operation;
When described electromagnetic heater is in the time that the second predeterminated voltage, second is preset the duty of power, described controlDescribed in device control, H bridge circuit enters the mode of operation of boosting, and wherein, described the second predeterminated voltage is less than described first to be presetVoltage, the described second default power is greater than the described first default power.
3. the step-up/step-down circuit for electromagnetic heater as claimed in claim 1, is characterized in that, described firstSwitching tube and described second switch pipe are respectively one of diode, IGBT, controllable silicon or metal-oxide-semiconductor.
4. the step-up/step-down circuit for electromagnetic heater as claimed in claim 3, is characterized in that, when describedOne switching tube is the first diode, when described second switch Guan Wei tri-IGBT, and the anode of described the first diode and instituteThe negative output terminal of stating rectifier bridge is connected, and the negative electrode of described the first diode is extremely connected with the E of a described IGBT, instituteState between the negative electrode of the first diode and the E utmost point of a described IGBT and there is first node, the C of a described IGBTThe utmost point is connected with the positive output end of described rectifier bridge, and the C utmost point of described the 3rd IGBT is connected with one end of described the first electric capacity,The E utmost point of described the 3rd IGBT is extremely connected with the C of described the 2nd IGBT, the E utmost point of described the 3rd IGBT and describedBetween the C utmost point of two IGBT, there is Section Point, the E utmost point of described the 2nd IGBT another with described the first electric capacity respectivelyThe negative output terminal of one end and described rectifier bridge is connected, and described the first inductance is connected to described first node and described second sectionPoint between.
5. the step-up/step-down circuit for electromagnetic heater as claimed in claim 3, is characterized in that, when describedOne switching tube is the first diode, when described second switch Guan Wei tri-IGBT, and the anode of described the first diode and instituteThe negative output terminal of stating rectifier bridge is connected, and the negative electrode of described the first diode is extremely connected with the E of a described IGBT, instituteState between the negative electrode of the first diode and the E utmost point of a described IGBT and there is first node, the C of a described IGBTThe utmost point is connected with the positive output end of described rectifier bridge, and the G utmost point of described the 3rd IGBT is connected with described controller, and describedThe C utmost point of three IGBT is connected with one end of described the first electric capacity, the E utmost point of described the 3rd IGBT and described the 2nd IGBTC extremely connected, between the E utmost point of described the 3rd IGBT and the C utmost point of described the 2nd IGBT, there is Section Point, instituteThe E utmost point of stating the 2nd IGBT is connected with the other end of described the first electric capacity and the negative output terminal of described rectifier bridge respectively, instituteStating the first inductance is connected between described first node and described Section Point.
6. the step-up/step-down circuit for electromagnetic heater as claimed in claim 3, is characterized in that, when describedOne switching tube is the first diode, when described second switch pipe is the second diode, the anode of described the first diode withThe negative output terminal of described rectifier bridge is connected, and the negative electrode of described the first diode is extremely connected with the E of a described IGBT,Between the E utmost point of the negative electrode of described the first diode and a described IGBT, there is first node, a described IGBT'sThe C utmost point is connected with the positive output end of described rectifier bridge, one end phase of the negative electrode of described the second diode and described the first electric capacityConnect, the anode of described the second diode is extremely connected with the C of described the 2nd IGBT, the anode of described the second diode andBetween the C utmost point of described the 2nd IGBT, there is the 3rd node, the E utmost point of described the 2nd IGBT respectively with described the first electricityHold the other end and the negative output terminal of described rectifier bridge be connected, described the first inductance be connected to described first node with described inBetween the 3rd node.
7. the step-up/step-down circuit for electromagnetic heater as described in claim 4-6 any one, is characterized in that,Also comprise choking-winding, described choking-winding is connected to the positive output end of described rectifier bridge and the C of a described IGBTBetween the utmost point.
8. the step-up/step-down circuit for electromagnetic heater as described in claim 4-6 any one, is characterized in that,Described resonance circuit comprises the second electric capacity and resonance coil in parallel, one of one end of described the second electric capacity and resonance coilEnd is connected with one end of described the first electric capacity respectively, and the other end of described the second electric capacity and the other end of resonance coil are respectivelyBe connected with the switching device in described electromagnetic heater.
9. the step-up/step-down circuit for electromagnetic heater as claimed in claim 8, is characterized in that, described switchDevice is the 4th IGBT, another of the C utmost point of described the 4th IGBT and the other end of described the second electric capacity and resonance coilEnd is connected respectively, and the G utmost point of described the 4th IGBT is connected with described controller, the E utmost point of described the 4th IGBT and instituteThe other end of stating the first electric capacity is connected.
As described in claim 1-9 any one for the control method of the step-up/step-down circuit of electromagnetic heater,It is characterized in that, comprise the following steps:
Obtain the duty of described electromagnetic heater;
Pass through to control the IGBT and second in described H bridge circuit according to the duty of described electromagnetic heaterThe dutycycle of IGBT is to adjust the voltage at described the first electric capacity two ends.
The control method of 11. step-up/step-down circuits for electromagnetic heater as claimed in claim 10, its feature existsIn, the duty of described electromagnetic heater comprises operating voltage and the operating power of described electromagnetic heater, itsIn,
When the operating voltage of described electromagnetic heater is higher than the work merit of predetermined voltage threshold and described electromagnetic heaterRate during lower than default power threshold, is controlled described H bridge circuit and is entered step-down mode of operation;
When the operating voltage of described electromagnetic heater not higher than described predetermined voltage threshold and described electromagnetic heaterWhen operating power is not less than described default power threshold, controls described H bridge circuit and enter the mode of operation of boosting.
The control method of 12. step-up/step-down circuits for electromagnetic heater as claimed in claim 11, its feature existsIn, described predetermined voltage threshold is 200-220V, described default power threshold is 1000-1400W.
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| CN201310430991.2A CN104470014B (en) | 2013-09-18 | 2013-09-18 | For step-up/step-down circuit and the control method thereof of electromagnetic heater |
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| CN201310430991.2A CN104470014B (en) | 2013-09-18 | 2013-09-18 | For step-up/step-down circuit and the control method thereof of electromagnetic heater |
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| CN106211394B (en) * | 2015-04-30 | 2019-05-31 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its switching tube open control device and method |
| CN106786416A (en) * | 2016-12-02 | 2017-05-31 | 国网四川省电力公司成都供电公司 | A kind of two-way variable-pressure HVDC tripper and short trouble cutting method |
| CN114421581B (en) * | 2022-03-31 | 2022-07-08 | 苏州浪潮智能科技有限公司 | Control circuit, method and device for backup battery unit and storage system |
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| CN1874621A (en) * | 2005-05-30 | 2006-12-06 | 日立家用电器公司 | Induction heating device |
| CN101232752A (en) * | 2008-01-18 | 2008-07-30 | 佛山市顺德区瑞德电子实业有限公司 | Microwave oven supply power soft switch high-frequency converter |
| CN102300349A (en) * | 2011-08-22 | 2011-12-28 | 河海大学常州校区 | Electromagnetic sensing heating device and method thereof |
| CN203504788U (en) * | 2013-09-18 | 2014-03-26 | 美的集团股份有限公司 | Buck-boost circuit for electromagnetic heating apparatus |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1874621A (en) * | 2005-05-30 | 2006-12-06 | 日立家用电器公司 | Induction heating device |
| CN101232752A (en) * | 2008-01-18 | 2008-07-30 | 佛山市顺德区瑞德电子实业有限公司 | Microwave oven supply power soft switch high-frequency converter |
| CN102300349A (en) * | 2011-08-22 | 2011-12-28 | 河海大学常州校区 | Electromagnetic sensing heating device and method thereof |
| CN203504788U (en) * | 2013-09-18 | 2014-03-26 | 美的集团股份有限公司 | Buck-boost circuit for electromagnetic heating apparatus |
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