CN102332713B - Method for anti-surge circuit for electromagnetic induction heating appliance - Google Patents
Method for anti-surge circuit for electromagnetic induction heating appliance Download PDFInfo
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Abstract
The invention relates to an anti-surge circuit for an electromagnetic induction heating appliance. The anti-surge circuit comprises a disturbance waveform obtaining unit, a triggering signal forming unit and a triggering signal outputting unit; the duration of a triggering signal output by the triggering signal forming unit is more than that of a disturbance waveform, wherein the input end of the disturbance waveform obtaining unit is connected to a direct-current voltage output end of a rectification unit; the output end of the disturbance waveform obtaining unit is connected to the input end of the triggering signal forming unit; the output end of the triggering signal forming unit is connected to the input end of the triggering signal outputting unit; the output end of the triggering signal outputting unit is connected with a control end of a switch device; and the output end of the triggering signal forming unit is also connected with an interruption input end of a control unit. By utilizing the anti-surge circuit for the electromagnetic induction heating appliance, the heating appliance and the method disclosed by the invention, the switch device cannot be damaged.
Description
Technical field
The present invention relates to household electrical appliance, more particularly, relate to a kind of surge-proof method for electromagnetic induction heater tool.
Background technology
Surge interference is extensively present in reality, and the startup of such as thunder and lightning, motor and stopping etc. all can produce surge voltage in AC power or AC network.When surge voltage enters other consuming devices, the sharply change of its voltage can be brought, the normal work of other consuming devices is affected, time serious, even can damage the element in consuming device.People usually can take some measures and avoid it to disturb.As shown in Figure 1, in the prior art, when the input of electromagnetic oven power supply produces surge interference, this interference signal is by current transformer T1 level amplification and through D1, D2, D3, D4 rectification, at D1, the anode of D3 produces disturbing signal, this disturbing signal is by resistance R5, R6, R2 causes U1 the 7th pin potential change, a low-level output signal is produced at U1 comparator output terminal the 1st pin, this signal one tunnel is sent into single-chip microcomputer (microcontroller) and is produced interruption, switching device (being IGBT in Fig. 1) drive circuit is directly given on another road, by producing low level at IGBT grid after drive circuit, IGBT is ended, protection IGBT, the shortcoming of this circuit is that the low level time that surge detection signal exports is very short, the time that hardware turns off IGBT is very short, software is leaned on to turn off IGBT drive singal for a long time, when there being continuous print surge pulse interference signal in electrical network, because single-chip microcomputer reaction speed is fast not, cause the damage of above-mentioned switching device sometimes.
Summary of the invention
The technical problem to be solved in the present invention is, there will be for the above-mentioned of prior art the defect damaging switching device when continuous print surge pulse disturbs, provide a kind of and there will not be the anti-surge circuit for electromagnetic induction heater tool, heating appliances and the method for damaging switching device situation when continuous print surge pulse disturbs.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of anti-surge circuit for electromagnetic induction heater tool, described electromagnetic induction heater tool comprises heater members, alternating voltage is converted to the rectification unit of direct voltage, control described direct voltage by the switching device of described heater members and the control unit controlling described switch device conductive or cut-off, described control unit is microcontroller, described anti-surge circuit comprises disturbance waveform acquisition unit, the triggering signal duration of its output is greater than triggering signal forming unit and the triggering signal output unit of disturbance waveform duration, wherein, the input of described disturbance waveform acquisition unit connects the DC voltage output end of described rectification unit, and described disturbance waveform acquisition unit output is connected to described triggering signal forming unit input, the output of described triggering signal forming unit is connected to the input of described triggering signal output unit, and the output of described triggering signal output unit is connected with the control end of described switching device, the output of described triggering signal forming unit is also connected with the interrupting input end of described control unit.
In the anti-surge circuit for electromagnetic induction heater tool of the present invention, described triggering signal forming unit also comprise one for formed by the disturbance waveform inputted triggering signal time, make the time lengthening subelement of described triggering signal duration extension.
In the anti-surge circuit for electromagnetic induction heater tool of the present invention, described triggering signal forming unit is that its positive input terminal is connected with described disturbance waveform acquisition unit output, its negative input end by the comparator of grounding through resistance, between the output that described time lengthening subelement is connected to described comparator and positive input terminal.
In the anti-surge circuit for electromagnetic induction heater tool of the present invention, described time lengthening subelement comprises the first diode, the second diode, the first resistance, the first electric capacity and the second resistance; Wherein, described first electric capacity is the polar capacitor that its positive pole is connected with described comparator output terminal, its negative pole is connected with described first diode cathode; Described first diode cathode is connected with described comparator positive input terminal; Described first diode cathode is also connected with described second diode cathode, and described second diode cathode is connected to earth potential by described first resistance; Described second resistance one end is connected to the anode of described first electric capacity, and one end connects power positive end.
In the anti-surge circuit for electromagnetic induction heater tool of the present invention, described disturbance waveform acquisition unit comprises the 4th resistance, the 5th resistance, the 9th resistance, the 3rd electric capacity and the 3rd diode; Wherein, described 4th resistance and the 3rd Capacitance parallel connection, the one end after parallel connection is connected to described rectification unit direct current positive output end, and its other end is connected with the 5th resistance one end; The described 5th resistance other end is connected with described 3rd diode cathode, described 3rd diode cathode output disturbance waveform; Described 3rd diode cathode is also connected on earth potential by described 9th resistance.
In the anti-surge circuit for electromagnetic induction heater tool of the present invention, described triggering signal output unit comprises the 7th resistance and the first transistor, wherein said 7th resistance one end is connected with described triggering signal forming unit output, the other end of described 7th resistance is connected with the base stage of described the first transistor, the grounded emitter of described the first transistor, its collector electrode is connected with the control end of described switching device.
In the anti-surge circuit for electromagnetic induction heater tool of the present invention, described switching device comprises IGBT, field effect transistor.
The invention still further relates to a kind of electromagnetic induction heater tool, comprise anti-surge circuit, described anti-surge circuit is above-mentioned anti-surge circuit; Described electromagnetic induction heater tool is electromagnetic oven, electromagnet water heater or electromagnetic rice cooker.
The invention still further relates to the method for Anti-surging in electromagnetic induction heater tool, comprise the steps:
A) judge whether to occur disturbance waveform, in this way, perform next step; Otherwise, repeat this step;
B) hardware produces triggering signal shutdown switch device, produces interrupt signal simultaneously and is sent to control unit;
C) described control unit response interrupt signal, after arranging guard time, output protection waveform turns off described switching device;
D) described control unit makes described switching device normally work at described guard time to rear output normal heating drive waveforms;
Wherein, the holding time the time interval be greater than when described protection wave form output appears in described disturbance waveform of described triggering signal.
In the method for Anti-surging in electromagnetic induction heater tool of the present invention; described step B) in, adopt the time lengthening subelement time that described triggering signal the is maintained triggering signal formed by disturbance waveform being held time extend to be greater than time interval when described protection wave form output appears in described disturbance waveform.
Implement the anti-surge circuit for electromagnetic induction heater tool of the present invention, heating appliances and method, there is following beneficial effect: because disturbance waveform takes from the DC output end through over commutation, and the longer and duration triggering signal that formed of its triggering signal forming unit time lasting compared with surge pulse itself can regulate, can ensure that switching device can not work in case so deposit at continuous print surge pulse, thus there will not be the situation that switching device damages.
Accompanying drawing explanation
Fig. 1 is the structural representation of the surge protection circuit that in prior art, electromagnetic oven uses;
Fig. 2 is the anti-surge circuit of the present invention for electromagnetic induction heater tool and the logic diagram of heating appliances embodiment thereof;
Fig. 3 is the circuit theory diagrams of described embodiment;
Fig. 4 is the flow chart of anti-method for wave in electromagnetic induction heater tool in described embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is further illustrated.
As shown in Figure 2, be used in the anti-surge circuit of electromagnetic induction heater tool and heating appliances embodiment thereof in the present invention, this electromagnetic induction heater tool is an electromagnetic oven, electromagnetic oven circuit comprises: heater members 22, alternating voltage is converted to direct voltage rectification unit 21, control the switching device 23 of above-mentioned direct voltage by heater members 22 and the control unit 24 of control switch device 23 conducting or cut-off, typically, control unit 24 adds oscillating circuit and drive circuit for microcontroller.During its work, alternating voltage in AC network is converted to the two ends output that direct voltage marks DC in fig. 2 by rectification unit 21, heater members 22 and switching device 23 are connected to the two ends of above-mentioned DC after connecting, when switching device 23 conducting, direct voltage, successively through heater members 22 and switching device 23, makes heater members 22 work (direct voltage of now rectification unit output is to the induction charging in resonant circuit); And when switching device 23 ends, direct voltage does not form loop, inductance in heater members 22 resonant circuit is first to resonant capacitance charging, and resonant capacitance charges to inductance again after being charged to ceiling voltage conversely, and resonant circuit charge and discharge process produces alternating magnetic field.What control the state (conducting or cut-off) of above-mentioned switching device 23 is control unit 24, its usual position is that microcontroller (i.e. single-chip microcomputer) adds oscillating circuit and drive circuit, the operating state of the output voltage control oscillating circuit of an input/output end port of this microcontroller, oscillating circuit passes through conducting or the cut-off of drive circuit control switch device 23.It is worth mentioning that, heater members 22 said here might not himself generate heat, and such as, in the present embodiment, this heater members 22 is exactly a resonant circuit, and it produces the magnetic field of alternation, and neighbouring canister is generated heat due to eddy current effect.In the present embodiment, this anti-surge circuit comprises disturbance waveform acquisition unit 25, triggering signal forming unit 26 and triggering signal output unit 27; Wherein, the input of disturbance waveform acquisition unit 25 connects the DC voltage output end (namely linking together with one end of heater members 22) of rectification unit 21, and the output of disturbance waveform acquisition unit 25 is connected to the input of triggering signal forming unit 26; The output of triggering signal forming unit 26 is connected to the input of triggering signal output unit 27, and the output of triggering signal output unit 27 is connected with the control end of switching device 23; The output of triggering signal forming unit 26 is also connected with the interrupting input end of control unit 24.Wherein, duration of triggering signal that above-mentioned triggering signal output unit 27 exports be greater than disturbance waveform duration of its input and duration of triggering signal of exporting of triggering signal output unit 27 adjustable.
In the present embodiment, the duration of the triggering signal exported in above-mentioned triggering signal output unit 27 is greater than its this function of disturbance waveform duration inputted and realizes by being arranged on one of them time lengthening subelement (not shown).The function of this time lengthening subelement makes described triggering signal duration extension exactly.In the present embodiment, triggering signal forming unit comprises that its positive input terminal is connected with disturbance waveform acquisition unit 25 output, its negative input end by the comparator of grounding through resistance, and time lengthening subelement is connected between the output of this comparator and positive input terminal.
Refer to Fig. 3, Fig. 3 is the electrical schematic diagram of anti-surge circuit in the present embodiment, in figure 3, bridge heap BR1 is the rectification unit 21 in Fig. 2, inductance L 1, electric capacity C4 is the heater members 22 in Fig. 2, IGBT is the switching device 23 in Fig. 2, resistance R4, resistance R5, resistance R9, electric capacity C3 and diode D3 is the disturbance waveform acquisition unit 25 in Fig. 2, resistance R1, resistance R2, resistance R3, resistance R8, resistance R10, electric capacity C1, electric capacity C2, diode D1, diode D2 and comparator U1 is the triggering signal generation unit 26 in Fig. 2, resistance R7 and triode TR1 is the triggering signal output unit 27 in Fig. 2, and the control unit 24 in Fig. 2 does not show in figure 3, only just show several ports of control unit 24.Therefore, in the present embodiment, time lengthening subelement comprises the first diode (diode D1), the second diode (diode D2), the first resistance (resistance R1), the first electric capacity (electric capacity C1) and the second resistance (resistance R2); Wherein, the first electric capacity (electric capacity C1) is its positive pole and comparator (U1) polar capacitor that output is connected, its negative pole is connected with the first diode (diode D1) negative pole; First diode (diode D1) negative pole is connected with comparator (U1) positive input terminal; First diode (diode D1) positive pole is also connected with the second diode (diode D2) negative pole, and the second diode (diode D2) positive pole is connected to earth potential by the first resistance (resistance R1); Second resistance (resistance R2) one end is connected to the anode of the first electric capacity (electric capacity C1), and one end connects power positive end (being denoted as the terminal of VCC in Fig. 3).
In the present embodiment, disturbance waveform acquisition unit 25 comprises the 4th resistance (resistance R4), the 5th resistance (resistance R5), the 9th resistance (resistance R9), the 3rd electric capacity (electric capacity C3) and the 3rd diode (diode D3); Wherein, the 4th resistance (resistance R4) and the 3rd electric capacity (electric capacity C3) parallel connection, the one end after parallel connection is connected to rectification unit 21 direct current positive output end, and its other end is connected with the 5th resistance (resistance R5) one end; 5th resistance (resistance R5) other end is connected with the 3rd diode (diode D3) positive pole, the 3rd diode (diode D3) negative pole output disturbance waveform; 3rd diode (diode D3) positive pole is also connected on earth potential by the 9th resistance (resistance R9).Triggering signal output unit 27 comprises the 7th resistance (resistance R7) and the first transistor (transistor TR1), wherein the 7th resistance (resistance R7) one end is connected with the output of triggering signal forming unit 26, the other end of the 7th resistance (resistance R7) is connected with the base stage of the first transistor (transistor TR1), the grounded emitter of the first transistor (transistor TR1), its collector electrode is connected with the control end of switching device 23.Triggering signal output unit 27 be arranged so that waveform is more stable when triggering wave form output to the control end of switching device 23.
In the present embodiment, switching device 23 is IGBT, but in other embodiments, switching device 23 also can be field effect transistor or transistor.
As seen from Figure 3, in the present embodiment, when the input of electromagnetic oven power supply produces surge interference, this interference signal through heap BR1 rectification of passing a bridge, electric capacity C3(high-voltage capacitance), resistance R4 filtering, produce disturbing signal; This disturbing signal is by resistance R5, R9 dividing potential drop, D3 rectification, after electric capacity C2 filtering, be added to the positive terminal (i.e. positive input terminal) of comparator U1 the 5th pin, cause U1 the 5th pin potential change, a high level output signal is produced at U1 comparator output terminal the 2nd pin, this signal makes triode TR1 conducting by resistance R7, if now IGBT grid is high level, due to triode TR1 conducting, IGBT grid will be dragged down as low level, thus available protecting IGBT is not damaged; If now IGBT grid is low level, IGBT is cut-off state.Under above-mentioned two states, IGBT can not conducting, thus IGBT can be protected fast and effectively not damaged.Simultaneously, when U1 comparator output terminal the 2nd pin is high, VCC voltage passes through R2, C1, D1, R3, form a charge circuit, electric capacity C1 is charged, the voltage of C1 adds the 5th pin of U1 by D1, the 2nd pin of comparator U1 is made to continue to maintain the high level of a period of time, make triode TR1 conducting, thus protect IGBT, the size of electric capacity C1 determines the time of delay protection, when surge disappears time, electric capacity C1 discharges, the 2nd pin output resume of U1 is high level, when C1 is discharged, 2nd pin of U1 exports as low level, now hardware no longer control IGBT drive circuit.When there is protection in hardware, software is by detecting the rising edge signal of U1 crus secunda, enter interrupt service routine, after entering above-mentioned interrupt service routine, control unit turns off the drive circuit of IGBT, IGBT is quit work under software (note, now hardware controls is also turn off IGBT, hardware turns off and can only continue for some time, so add software control, turn-off time length can be controlled arbitrarily, reliability is higher), simultaneously, software design patterns turns off time tag and the IGBT protective emblem of IGBT drive circuit, afterwards, main program judges whether setup times reaches, as do not reached, continue to stop heating, as reached, clear flag position also returns continuation heating.Software can turn off IGBT drive singal (the general turn-off time is set to 2 seconds) for a long time.Because the hardware self-lock protection time is longer, for the interference of continuous print surge, the method combined by software and hardware protection, this circuit can improve the reaction speed of protection and the reliability of protection greatly.
In the present embodiment, also relate to a kind of electromagnetic induction heater tool, this electromagnetic induction heater tool also comprises anti-surge circuit except the circuit realizing its function, and this anti-surge circuit is exactly above-mentioned anti-surge circuit.In the present embodiment, electromagnetic induction heater tool is electromagnetic oven, and in other embodiments, this electromagnetic induction heater tool also can be electromagnet water heater or electromagnetic rice cooker.
As shown in Figure 4, in the present embodiment, also relate to a kind of method of Anti-surging in electromagnetic induction heater tool, it comprises the steps:
Does step S11 disturbance waveform occur? as disturbance waveform occurs, perform step S13 and step S14; As disturbance waveform does not occur, perform step S12; In the present embodiment, above-mentioned disturbance waveform is the waveform formed after surge current or voltage occur, the appearance of disturbance waveform, the appearance of meaning surge current or voltage; So this step also can change a kind of describing method, namely surge current or voltage occur, perform step S13 and step S14; Otherwise, perform step S12.As for step S13 and S14, be parallel step in the present embodiment, there is no dividing of priority.Namely while execution step S13, perform step S14.
Step S12 performs other programs of Electromagnetic Heating: in this step; surge current or voltage is there is owing to there is no on alternating current, so, do not need to protect switching device (being IGBT in the present embodiment); that is, this electromagnetic heater normally works.And return step S11, judge next time.
Step S13 hardware turns off IGBT: when there is disturbance waveform; in the present embodiment; produce triggering signal by hardware (namely above-mentioned disturbance waveform acquisition unit 25, triggering signal forming unit 26 and triggering signal output unit 27) and output to the control end of switching device (being IGBT in the present embodiment); the state no matter IGBT is current turns off or is communicated with; all make IGBT turn off, play protection IGBT not by the effect of surge current or voltge surge.
Step S14 sends interrupt signal, call IGBT and protect subprogram: while execution above-mentioned steps S13, the triggering signal obtained by disturbance waveform is transported to control device (in the present embodiment, this control device is a MCU) interrupting input end, become the interrupt signal of a control device; Control device, after receiving this interrupt signal, calls the protection subprogram of IGBT.
Step S15 arranges protective emblem position, arranges guard time, exports and turns off IGBT waveform: in this step, control device calls the protection subprogram of switching device (IGBT), arranges protective emblem position, shielding heating or other operations; Guard time is set, and starts timing, meanwhile, the output of the driving switch device of control device exports the drive waveforms that this switching device is turned off, switching device is turned off.Why use hardware and software combination to realize shutdown switch device thus reach the object of the protection switch device when surge current or voltage arrive, because the speed of the triggering signal of hardware generation, but, its hold time can not oversize or be difficult to regulate, so, from angle fast, need hardware to produce triggering signal, make switching device enter guard mode as early as possible; But when there is continuous print surge current or voltage, the time of hardware protection is inadequate, still there is the danger that switching device damages; So adopt after hardware protection, call software and again protect switching device, and the guard time of software can be arranged, it both can reach longer guard time, be also convenient to regulate.But; the startup of software protection needs the regular hour; so; in the present embodiment; the triggering signal that above-mentioned hardware produces could terminate after must being maintained to the drive waveforms output of the shutdown switch device of software protection; that is, in the present embodiment, the holding time the time interval be greater than when described protection wave form output appears in described disturbance waveform of triggering signal.For reaching this object, in the present embodiment, the time adopting time lengthening subelement that described triggering signal is maintained is greater than time interval when described protection wave form output appears in described disturbance waveform.The triggering signal that this time lengthening subelement makes disturbance waveform be formed is held time prolongation.
Step S16 keeps IGBT to turn off: keep IGBT to turn off in this step; It is worth mentioning that, in this step, the triggering signal that possible hardware exports is also in the shutoff maintaining IGBT, but, the state of the triggering signal no matter hardware exports, in this step, by the waveform of the output of control device driving switch device, it must make switching device turn off.That is, in this step, may be that the drive waveforms that triggering signal and control device export makes switching device turn off simultaneously, also may be that the drive waveforms that control device exports makes separately above-mentioned switching device turn off.
Does step S17 setup times arrive? as arrived setup times, perform step S18; Otherwise, return step S16.
Step S18 removes protective emblem position, starts normal heating.
Like this, both achieved quick protection when surge current in electromagnetic heating device or voltage arrive, also achieved adjustment or the prolongation of guard time.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (1)
1. the method for Anti-surging in electromagnetic induction heater tool, is characterized in that, comprise the steps:
A) judge whether to occur disturbance waveform, in this way, perform next step; Otherwise, repeat this step;
B) hardware and disturbance waveform acquisition unit, triggering signal forming unit and triggering signal output unit produce triggering signal shutdown switch device, produce interrupt signal simultaneously and are sent to control unit;
C) described control unit response interrupt signal, after arranging guard time, output protection waveform turns off described switching device;
D) described control unit makes described switching device normally work at described guard time to rear output normal heating drive waveforms;
Wherein, the holding time the time interval be greater than when described protection wave form output appears in described disturbance waveform of described triggering signal;
Described step B) in, adopt the time lengthening subelement time that described triggering signal the is maintained triggering signal formed by disturbance waveform being held time extend to be greater than time interval when described protection wave form output appears in described disturbance waveform;
Described triggering signal forming unit is that its positive input terminal is connected with described disturbance waveform acquisition unit output, its negative input end is by the comparator of grounding through resistance;
Described time lengthening subelement comprises the first diode, the second diode, the first resistance, the first electric capacity and the second resistance; Wherein, described first electric capacity is the polar capacitor that its positive pole is connected with described comparator output terminal, its negative pole is connected with described first diode cathode; Described first diode cathode is connected with described comparator positive input terminal; Described first diode cathode is also connected with described second diode cathode, and described second diode cathode is connected to earth potential by described first resistance; Described second resistance one end is connected to the anode of described first electric capacity, and one end connects power positive end.
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| CN201110255404.1A CN102332713B (en) | 2011-08-31 | 2011-08-31 | Method for anti-surge circuit for electromagnetic induction heating appliance |
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| CN201110255404.1A CN102332713B (en) | 2011-08-31 | 2011-08-31 | Method for anti-surge circuit for electromagnetic induction heating appliance |
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| CN102332713B true CN102332713B (en) | 2015-02-25 |
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| CN105990824B (en) * | 2015-02-02 | 2018-10-02 | 佛山市顺德区美的电热电器制造有限公司 | Surge protection circuit |
| CN105305784B (en) * | 2015-12-01 | 2018-05-01 | 珠海格力电器股份有限公司 | Surge protection method and circuit, IGBT circuit and heater |
| CN109963367A (en) * | 2017-12-25 | 2019-07-02 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetism cooking pot and its lightning surge protection control method and device |
| CN109212433B (en) * | 2018-10-18 | 2024-03-26 | 中国科学院电工研究所 | Inverter IGBT fault early warning and protection circuit |
| CN111505946B (en) * | 2019-01-31 | 2021-11-19 | 华为终端有限公司 | Equipment control method and equipment |
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| CN201178498Y (en) * | 2008-04-03 | 2009-01-07 | 深圳和而泰智能控制股份有限公司 | Surge protection circuit for electromagentic furnace |
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| JP3249294B2 (en) * | 1994-05-31 | 2002-01-21 | 株式会社東芝 | Inverter for induction heating cooker |
| US6717785B2 (en) * | 2000-03-31 | 2004-04-06 | Denso Corporation | Semiconductor switching element driving circuit |
| CN100574031C (en) * | 2007-04-06 | 2009-12-23 | 广州金升阳科技有限公司 | A kind of power convertor output protection circuit |
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