CN207354056U - The switch controlled circuit of electromagnetic heater - Google Patents

Abstract

The utility model provides a kind of switch controlled circuit of electromagnetic heater, the control circuit includes drive circuit and main control chip, the drive circuit includes driving power module and control module, the main control chip connects driving power module and control module respectively, driving power module output terminal link control module, to supply control module driving voltage, main control chip exports unlike signal to the driving power module, so that driving power module produces at least two driving voltages.This programme can reduce dash current and operating noise.

Description

The switch controlled circuit of electromagnetic heater

Technical field

It the utility model is related to field of kitchen electric appliance, more particularly to a kind of switch controlled circuit of electromagnetic heater.

Background technology

Currently used electromagnetic oven is more controlled electromagnetic resonant circuit using single IGBT, and in order to realize electromagnetic oven Low-power heating, frequently with the processing mode for losing ripple, i.e., carry out selectable intermittent-heating within each cycle of alternating current. This processing mode, IGBT turn on for big voltage firmly when opening, this dash current to IGBT is larger, causes IGBT to use the longevity Life reduces, and operating noise is larger.

In order to solve the problems, such as this, industry proposes a kind of improvement project, i.e., increases in existing IGBT control circuits One controlling brancher, when the controlling brancher does not work, IGBT control circuits carry out traditional cut-off and ON operation, in the control When branch works, which carries out partial pressure to the voltage of existing IGBT control circuits, so as to control IGBT decompression conductings.This Kind scheme can solve the problems, such as that above-mentioned IGBT dash currents are larger, operating noise is larger to a certain extent, but due to this The controlling brancher of scheme only plays a part of to be depressured the voltage in existing IGBT control circuits, when the controlling brancher not work When making, IGBT control circuits can still work normally, therefore when damaging occurs in the controlling brancher or occurs controlling by mistake, IGBT's Become traditional big voltage turns on situation firmly again for control, and is not easy to find in time.

Thus, it is necessory to provide a kind of technical solution, to overcome the problems of the above-mentioned prior art.

Utility model content

A kind of electromagnetic heating is provided the technical problem to be solved by the utility model is to overcome the deficiencies in the prior art The switch controlled circuit of device, to reduce dash current and operating noise, while can avoid when antihypertensive effect fails, switch Manage the risk that can still work and bring.

In order to achieve the above object, a kind of technical solution of the utility model is as follows：

A kind of switch controlled circuit of electromagnetic heater, the control circuit include drive circuit and main control chip, Wherein, the drive circuit includes driving power module and control module, and the main control chip connects driving power module respectively And control module, driving power module output terminal link control module, to supply control module driving voltage, main control chip output Unlike signal is to the driving power module, so that driving power module produces at least two driving voltages.

As the further improved technical solution of the utility model, the main control chip exports unlike signal to the control Module, to control the switching tube to be operated in cut-off state or conducting state.

As the further improved technical solution of the utility model, described two driving voltages include the first driving voltage and Second driving voltage, the magnitude of voltage of first driving voltage is 6V-12V, and the magnitude of voltage of second driving voltage is 15V- 18V。

As the further improved technical solution of the utility model, duration of the three level signal be more than 0 and Less than or equal to 3ms.The dash current and operating noise that switching tube is subject to when can both reduce inspection pot within this time or start, Can avoid working long hours in amplification region again causes switching tube loss excessive.

As the further improved technical solution of the utility model, the driving power module includes voltage regulation unit, first Conducting branches and the second conducting branches, first conducting branches conducting and second conducting branches are disconnected with by the voltage stabilizing Unit is accessed between the supply voltage and the output terminal of the driving power module, so that the output of the driving power module The first driving voltage of end output；First conducting branches shut-off and second conducting branches conducting are with by the voltage regulation unit Do not access between the supply voltage and the output terminal of the driving power module, so that the output terminal of the driving power module Export the second driving voltage.

As the further improved technical solution of the utility model, the voltage regulation unit includes the first zener diode, institute State the anode connection supply voltage of the first zener diode, the cathode of first zener diode and first conducting branches Connection, first conducting branches include the first triode, the second triode and the 3rd triode, first triode and institute State the control pole of the second triode with the second output terminal of the main control chip to be connected, first triode and the described 2nd 3 The emitter ground connection of pole pipe, the collector of first triode are connected to supply voltage, the collector of second triode The control pole of the 3rd triode is connected to, the emitter of the 3rd triode is connected to first zener diode Cathode, the collector of the 3rd triode are connected to the output terminal of the driving power module.

As the further improved technical solution of the utility model, second conducting branches include the 4th triode and the Five triodes, the control pole of the 4th triode are connected with the power circuit, the emitter ground connection of the 4th triode, The collector of 4th triode is connected with the control pole of the 5th triode, the emitter connection of the 5th triode To the power circuit, the collector of the 5th triode is connected to the output terminal of the driving power module.

As the further improved technical solution of the utility model, the driving power module, which further includes, is connected on described First resistor between the control pole of the collector of two triodes and the 3rd triode, is connected to the 3rd triode Second resistance between control pole and emitter, the 3rd electricity being connected between the control pole of the 4th triode and supply voltage Resistance, the 4th resistance being connected between the collector of the 4th triode and the control pole of the 5th triode, and it is connected to the 5th The 5th resistance between the control pole and emitter of triode.

As the further improved technical solution of the utility model, the driving power module further includes two pole of the second voltage stabilizing Pipe, the anode of second zener diode are connected to the emitter of the 3rd triode and first zener diode At the tie point of cathode, the plus earth of second zener diode, first zener diode and second voltage stabilizing Diode is 9V voltage-stabiliser tubes.

As the further improved technical solution of the utility model, the main control chip includes being connected to driving power module Two ports, to control the driving power module to produce the different driving voltage of at least three kinds of magnitudes of voltage.

In the technical solution of the utility model, driving power module is connected with supply voltage, is control by driving power module Module for power supply processed, when driving power module does not work because of failure, control module can not work because that can not be powered, and avoid In the prior art control module still can the hard conduction mode work of the big voltage of tradition the defects of；Further, the driving electricity Supply voltage can also be changed into two kinds of different driving voltages of magnitude of voltage by source module, be opened so as to fulfill with relatively low voltage driving Pipe is closed to be operated in amplification conducting state, with higher voltage-driven switch pipe be operated in saturation conduction state, inspection pot, start and During low-power heating, controlling switch pipe is operated in amplification conducting state, can reduce impact, reduction work of the electric current to IGBT and make an uproar Sound.

Brief description of the drawings

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Required attached drawing is briefly described, it should be apparent that, drawings in the following description are only the one of the utility model A little embodiments, for those of ordinary skill in the art, without creative efforts, can also be according to these Attached drawing obtains other attached drawings.

Fig. 1 is the block diagram representation of the switch controlled circuit of electromagnetic heater in one embodiment of the utility model；

Fig. 2 is the schematic diagram of the switch controlled circuit of electromagnetic heater in one embodiment of the utility model；

Fig. 3 is the physical circuit figure of the switch controlled circuit of electromagnetic heater in one embodiment of the utility model；

Fig. 4 is the switching tube work wave schematic diagram of electromagnetic heater in one embodiment of the utility model；

Fig. 5 is the control pole tension of switching tube and the graph of relation of collector current in one embodiment of the utility model.

Reference numeral：

100- switching tubes；200- control modules；300- main control chips；400- driving power modules；The conducting branch of 401- first Road；The second conducting branches of 402-；403- voltage regulation units；500- drive circuits.

Embodiment

The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without creative efforts All other embodiments obtained, shall fall within the protection scope of the present invention.

Embodiment one

Fig. 1 to Fig. 2 is referred to, the utility model provides a kind of switch controlled circuit of electromagnetic heater, it includes Main control chip 300, the control module 200 being connected with switching tube 100, and the driving power being connected with the control module 200 Module 400, the driving power module 400 are connected with supply voltage VCC, and the main control chip 300 includes and the control mould The first connected output terminal 31 of block 200 and the second output terminal 32 being connected with the driving power module 400, described first is defeated Outlet 31 exports the first level signal or second electrical level signal, to control the control module 200 to drive 100 work of switching tube Make in cut-off state or conducting state, second output terminal 32 exports three level signal or the 4th level signal to the drive Dynamic power module 400, to control the driving power module 400 that the supply voltage VCC is changed into different the of magnitude of voltage One driving voltage or the second driving voltage are exported to the control module 200, in the on-state, the control module 200 The switching tube 100 is driven to be operated in amplification conducting state according to the first driving voltage, the control module 200 is according to the second driving Voltage drives the switching tube 100 to be operated in saturation conduction state.

The driving power module 400 of the utility model is connected with supply voltage VCC, by driving power module 400 in order to control Module 200 is powered, and when driving power module 400 does not work because of failure, control module 200 can not work because it can not be powered Make, avoid in the prior art control module 200 still can the hard conduction mode work of the big voltage of tradition the defects of.Further, The driving power module 400 supply voltage VCC can also be changed into the first different driving voltage of at least two magnitudes of voltage or Second driving voltage, amplification conducting state is operated in, with higher voltage so as to fulfill with relatively low voltage-driven switch pipe 100 Driving switch pipe 100 is operated in saturation conduction state, and when examining pot, startup and low-power heating, controlling switch pipe 100 is operated in Amplify conducting state, impact of the electric current to IGBT can be reduced, reduce operating noise.Further, the main control chip 300 may be used also It is arranged to include being connected to two ports of driving power module 400, to control the driving power module 400 to produce at least three The different driving voltage of kind magnitude of voltage, such as 9V is produced, tri- kinds of voltages of 12V, 18V or generation 6V, 9V, 12V, tetra- kinds of electricity of 18V Pressure, so as to realize the control mode that driving voltage incrementally increases on startup, preferably reduces dash current and operating noise.

Referring to Fig. 2, in the present embodiment, the driving power module 400 includes the conducting branch of voltage regulation unit 403, first 401 and second conducting branches 402 of road.The voltage regulation unit 403 and first conducting branches 401 are connected to the supply voltage Between the output terminals A of VCC and driving power module 400 point, second conducting branches 402 are connected to the supply voltage VCC Between the output terminals A point of driving power module 400.First conducting branches 401 and second conducting branches 402 with Second output terminal 32 of the main control chip 300 is connected, and when one control of the second output terminal 32 output of the main control chip 300 During signal, one of them in first conducting branches 401 and second conducting branches 402 is cut-off, another shut-off.Example Such as, when the three level signal that the second output terminal 32 of main control chip 300 exports is high level signal, the first conducting branch Road 401 turns on, the second conducting branches 402 turn off, at this time the supply voltage VCC, voltage regulation unit 403, the first conducting branches 401st, the output terminals A of driving power module 400 forms path, and the voltage of A points is the first driving voltage at this time, it is supply voltage VCC subtract by voltage regulation unit 403 decline after voltage (the first conducting branches 401 be arranged to decompression it is smaller, can ignore not Meter)；When the 4th level signal that the second output terminal 32 of main control chip 300 exports is low level signal, first conducting Branch 401 turns off, the second conducting branches 402 are open-minded, and the supply voltage VCC passes through the second conducting branches 402 and output at this time A is held to form path, the voltage of A points is the second driving voltage at this time, and (the second conducting branches 402 are arranged to for supply voltage VCC for it Decompression it is smaller, can be ignored), i.e., described driving power module 400 can produce the first different driving voltage of magnitude of voltage or Second driving voltage, when producing less first driving voltage of magnitude of voltage to the control module 200, controllable switch pipe 100 are operated in amplification conducting state, when larger the second driving voltage to the control module 200 of generation magnitude of voltage, then may be used Controlling switch pipe 100 is operated in saturation conduction state.Regardless of whether driving power module 400 produce be the first driving voltage or Second driving voltage, control module 200 need the power supply of driving power module 400 to work, and this guarantees switching tube 100 Work whether with driving power module 400 power supply whether be directly linked, it is only to avoid control module in the prior art It is vertical power bring the defects of can still being worked with the hard conduction mode of traditional big voltage.This programme passes through in driving power module 400 set supply voltage VCC, on the one hand power to module 200 in order to control, ensure that its driving switch pipe 100 is in work shape Supply voltage VCC, on the other hand can be changed into the different driving voltage of at least two magnitudes of voltage, with driving switch pipe 100 by state It is operated in amplification conducting or saturation conduction state.And it should be noted that the magnitude of voltage at 100 control pole of switching tube can not It is identical with the magnitude of voltage of the output terminals A point of driving power module 400, if there is clearly corresponding relation therewith, for example (,) it is defeated The exportable one high and one low voltage of outlet A points, the control pole of switching tube 100 is corresponding to be with one high and one low voltage Can, the magnitude of voltage without requiring 100 control pole of switching tube is identical with the magnitude of voltage of output terminals A point.

Further, second driving voltage is 15V-18V；First driving voltage is 6V-12V, is preferably 9V. Referring to Fig. 5, when driving IGBT switching tubes with the driving voltage of 9V, IGBT switching tubes are operated in amplification conducting state, impact Electric current and operating noise are smaller.

It should be noted that the switching tube is in running order to specifically include cut-off state, amplification conducting state With saturation conduction state, which is all to be in the state in the case of being powered in switching tube, belongs to working status；And Off position refers to that switching tube is not powered on, itself and cut-off state are not same concepts.In addition, the example above is to work as master control core During the second output terminal 32 output high level signal of piece 300, the first conducting branches 401 turn on, the second conducting branches 402 turn off, Second output terminal 32 exports then opposite during low level signal；It is understood that it can certainly be arranged to work as main control chip 300 The second output terminal 32 output low level signal when, the first conducting branches 401 turn on, the second conducting branches 402 turn off, and second is defeated Outlet 32 exports then opposite during high level signal.I.e., it can be achieved that the first conducting branches 401 turn on and second conducting branches 402 disconnect so that voltage regulation unit 403 is accessed between the supply voltage VCC and the output terminals A of the driving power module, so that The output terminal of the driving power module 400 exports the first driving voltage；Or first conducting branches 401 turn off and described Second conducting branches 402 are turned on so that the voltage regulation unit 403 is not accessed the supply voltage VCC and the driving power module Output terminals A between so that the driving power module 400 output terminal export the second driving voltage.

Embodiment two

Fig. 3 and Fig. 4 are referred to, it implements electricity for the switch controlled circuit one of the utility model electromagnetic heater Road figure and switching tube work wave schematic diagram.Its circuit structure is described more fully below.

Wherein, main control chip 300 is specifically as follows miniature control chip MCU, driving power module 400 and control module 200 both cooperations form a complete drive circuit 500, and the output terminal of overall drive circuit 500 is connected to the control of switching tube 100 Pole processed is with driving switch pipe 100.First output terminal 31 of the main control chip 300 is connected to the control module 200, and second is defeated Outlet 32 is connected to driving power module 400.The driving power module 400 is connected with supply voltage VCC, the driving power Module 400 includes voltage regulation unit 403, the first conducting branches 401 and the second conducting branches 402, and the voltage regulation unit 403 includes the The anode connection supply voltage VCC of one zener diode ZD303, the first zener diode ZD303, first voltage stabilizing two The cathode of pole pipe ZD303 is connected with first conducting branches 401, and first conducting branches 401 include the first triode Q306, the second triode Q304 and the 3rd triode Q302, the first triode Q306 and the second triode Q304's Control pole is connected with the second output terminal 32 of the main control chip 300, the first triode Q306 and second triode The emitter ground connection of Q304, the collector of the first triode Q306 are connected to supply voltage VCC, second triode The collector of Q304 is connected to the control pole of the 3rd triode Q302, and the emitter of the 3rd triode Q302 is connected to The cathode of the first zener diode ZD303, emitter Q302 and first zener diode of the 3rd triode The connection of the cathode of ZD303, and be grounded through the second zener diode ZD302, the cathode of the second zener diode ZD302 connects Ground, the collector of the 3rd triode Q302 are connected to the output terminals A point of the driving power module 400.Preferably, it is described First zener diode ZD303 and the second zener diode ZD302 is 9V voltage-stabiliser tubes.Second conducting branches 402 Including the 4th triode Q305 and the 5th triode Q303, control pole and the power circuit of the 4th triode Q305 VCC is connected, the emitter ground connection of the 4th triode Q305, the collector and the described 5th 3 of the 4th triode Q305 The control pole of pole pipe Q303 is connected, and the emitter of the 5th triode Q303 is connected to the power circuit VCC, and the described 5th The collector of triode Q303 is connected to the output terminals A point of the driving power module 400.Wherein, first triode Q306, the second triode Q304, the 4th triode Q305 are NPN type triode, the 3rd triode Q302, the 5th triode Q303 is PNP type triode.

The driving power module 400 further includes the collector and the described 3rd 3 for being connected on the second triode Q304 First resistor R309 between the control pole of pole pipe Q302, be connected to the 3rd triode Q302 control pole and emitter it Between second resistance R308, the 3rd resistor R311 being connected between the control pole of the 4th triode Q305 and supply voltage VCC, The 4th resistance R312 being connected between the collector of the 4th triode Q305 and the control pole of the 5th triode Q303, is connected to The 5th resistance R313 between the control pole and emitter of 5th triode Q305, and it is connected to the second of main control chip 300 The 6th resistance R307 between 32 and first triode Q306 of output terminal.The driving power module, which further includes, is connected in parallel in electricity Ground capacity C301 and electrolytic capacitor C300 between source voltage VCC and earth point.

The control module 200 includes the 6th triode Q201, the 7th triode Q300 and the 8th triode Q301, described The control pole of 6th triode Q201 is connected to the first output terminal 31 of the main control chip 300, institute by the 7th resistance R304 The emitter ground connection of the 6th triode Q201 is stated, the collector of the 6th triode Q201 is connected to the 7th triode The control pole of Q300 and the 8th triode Q301.The emitter of the 7th triode Q300 is with the 8th triode Q301's Emitter is connected, and the control pole of switching tube 100 is connected to by the 8th resistance R310, and the control module 200 further includes negative Pole is connected to the switch control pole of control 100, the 3rd voltage-stabiliser tube ZD301 of plus earth, and with the 3rd voltage stabilizing 9th resistance R6 of pipe ZD301 parallel connections.The collector of the 7th triode Q300 by a pair of in parallel resistance R305 and R305-1 is grounded, and the control pole of the 8th triode Q301 is connected to driving power module 400 by the tenth resistance R302 Output terminals A point, the collector of the 8th triode Q301 are connected to driving by a pair of resistance R306 and R306-1 in parallel The output terminals A point of power module 400.The control module 200 further includes the output terminals A point for being connected to driving power module 400 The 11st resistance R303 between the first output terminal 31 of main control chip 300, and anode are connected to the of main control chip 300 4th voltage-stabiliser tube ZD300 of one output terminal 31, plus earth.Wherein, the 6th triode Q201 and the 8th triode Q301 For NPN type triode, the 7th triode Q300 is PNP type triode.

Also referring to Fig. 4, when electromagnetic heater is in high-power heated condition, the second of main control chip 300 is defeated The output of outlet 32 is low level 4th level signal, and triode Q306, Q304, Q302 ends at this time, triode Q305, Q303 Conducting, the voltage of output terminals A point is the second driving voltage at this time, and about supply voltage VCC (because Q303 conduction voltage drops are smaller, can Ignore)；31 output pulse signal of the first output terminal of main control chip 300, the pulse signal can be that PPG signals or PWM believe Number, illustrated below by taking PPG signals as an example, when PPG signals are the first level signal of high level, control module 200 Triode Q201, Q300 are turned on, and Q301 cut-offs, the voltage of B points is low level at the control pole of switching tube 100 at this time, switching tube IGBT is in cut-off state；When PPG signals are low level second electrical level signal, triode Q201, Q300 cut-off, Q301 are led It is logical, at this time B points voltage be about supply voltage VCC (because triode Q301 and resistance R306, R306-1, R310 pressure drop are smaller, can Ignore), the supply voltage VCC is arranged to 15V-18V, the IGBT characteristic curves according to Fig. 5, and IGBT is in saturation at this time Conducting state.

When electromagnetic oven, which is in small-power, to be started or examine pot state, the second output terminal 32 output of main control chip 300 is The three level signal of high level, at this time triode Q306, Q304, Q302 conductings, Q305, Q303 cut-off, the electricity of output terminals A point Press as the first driving voltage, about supply voltage VCC subtract voltage-stabiliser tube ZD303 magnitude of voltage (because Q302 conduction voltage drops are smaller, can Ignore)；The first output terminal 31 output PPG signals of main control chip 300, when PPG signals are the first level signal of high level, Q201, Q300 are turned on, and Q301 cut-offs, B points voltage is low level at this time, and IGBT is in cut-off state；When PPG signals are low level Second electrical level signal when, Q201, Q300 cut-off, Q301 conducting, B points voltage is about A point voltages VCC-ZD303 at this time, described First driving voltage may be configured as 6V-12V, preferably 9V, the IGBT characteristic curves according to Fig. 5, and IGBT is in and puts at this time Big conducting state.After IGBT is operated in amplification conducting state for a period of time under the control in three level signal, second is defeated Outlet 32 can export low level 4th level signal again, electromagnetic oven is heated a period of time under IGBT saturation conduction states, Ensure overall heating power；The duration of the three level signal is more than 0 and is less than or equal to 5ms, preferably 1ms, 2ms, 3ms, dash current and operating noise during because can not only reduce startup within this time, but also can avoid in amplification region for a long time Work causes switching tube loss excessive.

By the explanation of above example, the switch controlled electricity of electromagnetic heater provided by the utility model Road, its driving power module 400 are connected with supply voltage VCC, and by driving power module 400, module 200 is powered in order to control, works as drive Dynamic power module 400 because failure do not work when, control module 200 can not work because that can not be powered, and avoid existing skill In art control module 200 still can the hard conduction mode work of the big voltage of tradition the defects of.Further, the driving power module 400 can also change into supply voltage VCC magnitude of voltage different the first driving voltage or the second driving voltage, so as to fulfill with compared with Low voltage-driven switch pipe 100 is operated in amplification conducting state, is operated in saturation with higher voltage-driven switch pipe 100 and leads Logical state, when examining pot, startup and low-power heating, controlling switch pipe 100 is operated in amplification conducting state, can reduce electric current pair The impact of IGBT, reduce operating noise.The switch controlled circuit of the electromagnetic heater can be used in electromagnetic oven, electromagnetic heating lunch Stew, electromagnetic heating pressure pot, and in the culinary cuisine electric appliance such as electromagnetic heating cooking machine.

In the description of the utility model, it is to be understood that term " " center ", " transverse direction ", " thickness ", " on ", " under ", The orientation or position relationship of the instruction such as " vertical ", " level ", " top ", " bottom ", " interior ", " outer ", " radial direction ", " circumferential direction " are based on attached Orientation or position relationship shown in figure, are for only for ease of and describe the utility model and simplify to describe, rather than instruction or hint Signified device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this The limitation of utility model.

In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or Implicitly include one or more this feature.In the description of the utility model, " multiple " are meant that two or two More than, unless otherwise specifically defined.

In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be It is connected directly, can also be indirectly connected by intermediary, can is the mutual of connection inside two elements or two elements Interactively.For the ordinary skill in the art, it can understand that above-mentioned term is new in this practicality as the case may be Concrete meaning in type.

In the utility model, unless otherwise clearly defined and limited, fisrt feature is "above" or "below" second feature Can be that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, first is special Sign second feature " on ", " top " and " above " can be fisrt feature directly over second feature or oblique upper, or only Represent that fisrt feature level height is higher than second feature.

The above, is only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to In this, any one skilled in the art is in the technical scope that the utility model discloses, the change that can readily occur in Change or replace, should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with right It is required that protection domain subject to.

Claims (10)

1. a kind of switch controlled circuit of electromagnetic heater, the control circuit includes drive circuit and main control chip, its It is characterized in that, the drive circuit includes driving power module and control module, and the main control chip connects driving power respectively Module and control module, driving power module output terminal link control module, to supply control module driving voltage, main control chip Unlike signal is exported to the driving power module, so that driving power module produces at least two driving voltages.

2. the switch controlled circuit of electromagnetic heater as claimed in claim 1, it is characterised in that the main control chip is defeated Go out unlike signal to the control module, to control the switching tube to be operated in cut-off state or conducting state.

3. the switch controlled circuit of electromagnetic heater as claimed in claim 1, it is characterised in that described two driving electricity Briquetting includes the first driving voltage and the second driving voltage, and the magnitude of voltage of first driving voltage is 6V-12V, and described second drives The magnitude of voltage of dynamic voltage is 15V-18V.

4. the switch controlled circuit of electromagnetic heater as claimed in claim 3, it is characterised in that the first driving electricity The duration each time of pressure is more than 0 and is less than or equal to 3ms.

5. the switch controlled circuit of electromagnetic heater according to any one of claims 1 to 4, it is characterised in that institute Stating driving power module includes voltage regulation unit, the first conducting branches and the second conducting branches, the first conducting branches conducting and Second conducting branches disconnect with by the output terminal of voltage regulation unit access supply voltage and the driving power module it Between, so that the output terminal of the driving power module exports the second driving voltage；First conducting branches shut-off and described the Two conducting branch are turned on so that the voltage regulation unit is not accessed between supply voltage and the output terminal of the driving power module, so that The output terminal of the driving power module exports the first driving voltage.

6. the switch controlled circuit of electromagnetic heater as claimed in claim 5, it is characterised in that the voltage regulation unit bag The first zener diode is included, the anode connection supply voltage of first zener diode, first zener diode is just Pole is connected with first conducting branches, and first conducting branches include the first triode, the second triode and the three or three pole Pipe, first triode and the control pole of second triode are connected with the second output terminal of the control module, described The emitter of first triode and second triode is grounded, and the collector of first triode is connected to supply voltage, The collector of second triode is connected to the control pole of the 3rd triode, the emitter connection of the 3rd triode To the cathode of first zener diode, the collector of the 3rd triode is connected to the output of the driving power module End.

7. the switch controlled circuit of electromagnetic heater as claimed in claim 6, it is characterised in that the second conducting branch Road includes the 4th triode and the 5th triode, and the control pole of the 4th triode is connected with the supply voltage, and described The emitter ground connection of four triodes, the collector of the 4th triode is connected with the control pole of the 5th triode, described The emitter of 5th triode is connected to the supply voltage, and the collector of the 5th triode is connected to the driving power The output terminal of module.

8. the switch controlled circuit of electromagnetic heater as claimed in claim 7, it is characterised in that the driving power mould Block further includes the first resistor between the collector for being connected on second triode and the control pole of the 3rd triode, even The second resistance being connected between the control pole of the 3rd triode and emitter, is connected to the control pole and electricity of the 4th triode 3rd resistor between the voltage of source, the 4th electricity being connected between the collector of the 4th triode and the control pole of the 5th triode Resistance, and the 5th resistance being connected between the control pole of the 5th triode and emitter.

9. the switch controlled circuit of electromagnetic heater as claimed in claim 6, it is characterised in that the driving power mould Block further includes the second zener diode, the anode of second zener diode be connected to the emitter of the 3rd triode with At the tie point of the cathode of first zener diode, the plus earth of second zener diode, wherein described first Zener diode and second zener diode are 9V voltage-stabiliser tubes.

10. the switch controlled circuit of electromagnetic heater as claimed in claim 1, it is characterised in that the main control chip Two ports including being connected to driving power module, to control the driving power module to produce at least three kinds of magnitude of voltage differences Driving voltage.