CN109842308A - The control device and method of electromagnetism cooking pot and its power switch tube - Google Patents

The control device and method of electromagnetism cooking pot and its power switch tube Download PDF

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Publication number
CN109842308A
CN109842308A CN201711229326.1A CN201711229326A CN109842308A CN 109842308 A CN109842308 A CN 109842308A CN 201711229326 A CN201711229326 A CN 201711229326A CN 109842308 A CN109842308 A CN 109842308A
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circuit
power switch
signal
switch tube
resistance
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CN201711229326.1A
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CN109842308B (en
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江德勇
王云峰
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Abstract

The invention discloses a kind of electromagnetism cooking pot and its control devices and method of power switch tube, the electromagnetism cooking pot includes the first power switch tube and the second power switch tube parallel with one another, the device includes: main control module, and main control module is for exporting inceptive impulse signal；Drive module, drive module is for handling inceptive impulse signal to obtain the first driving signal and the second driving signal, and drive control is carried out to the first power switch tube by the first driving signal and drive control is carried out to the second power switch tube by the second driving signal, to control the first power switch tube and the second power switch tube turn-on and turn-off in turn.The apparatus according to the invention, two power switch tubes in parallel turn-on and turn-off in turn can be controlled, unbalanced phenomenon is distributed to avoid the electric current for occurring flowing through power switch tube, the reliability of power switch tube is improved, so as to guarantee the normal use of electromagnetism cooking pot.

Description

The control device and method of electromagnetism cooking pot and its power switch tube
Technical field
The present invention relates to living electric apparatus technical field, in particular to the control dress of power switch tube in a kind of electromagnetism cooking pot Set, in a kind of electromagnetism cooking pot and a kind of electromagnetism cooking pot power switch tube control method.
Background technique
The power of the electromagnetism cooking pot such as electromagnetic oven of household mainly has cooking, chafing dish, Baoshang, boils generally in 2000W or so The functions such as congee.In order to make user there are more functional experiences, two IGBT (Insulated in parallel can be set in electromagnetic oven Gate Bipolar Transistor, insulated gate bipolar transistor) to improve the heating power of electromagnetic oven.By in electromagnetism Two IGBT in parallel are set in furnace, the heating power of electromagnetic oven can be increased to 2600W, or even can be by the heating function of electromagnetic oven Rate is increased to 3000W.
However, when two IGBT in parallel being arranged in electromagnetic oven are simultaneously turned on, since the single characteristic of IGBT can Can be different, therefore each IGBT required time from turning off to opening is also different, and the conduction voltage drop of each IGBT is also different, It is easy to cause the electric current distribution for flowing through IGBT unbalanced, to influence the reliability of IGBT, or even will affect the normal of electromagnetic oven It uses.
Summary of the invention
The present invention is directed to solve one of the technical problem in above-mentioned technology at least to a certain extent.For this purpose, of the invention One purpose is to propose a kind of control device of power switch tube in electromagnetism cooking pot, can control two power in parallel and open Pipe turn-on and turn-off in turn are closed, unbalanced phenomenon is distributed to avoid the electric current for occurring flowing through power switch tube, improves power and open The reliability of pipe is closed, so as to guarantee the normal use of electromagnetism cooking pot.
Second object of the present invention is to propose a kind of electromagnetism cooking pot.
Third object of the present invention is to propose a kind of control method of power switch tube in electromagnetism cooking pot.
In order to achieve the above objectives, first aspect present invention embodiment proposes power switch tube in a kind of electromagnetism cooking pot Control device, the electromagnetism cooking pot include the first power switch tube and the second power switch tube parallel with one another, the control Device includes: main control module, and the main control module is for exporting inceptive impulse signal；Drive module, the drive module are used for The inceptive impulse signal is handled to obtain the first driving signal and the second driving signal, and driven by described first Signal carries out drive control and by second driving signal to second power switch to first power switch tube Pipe carries out drive control, to control first power switch tube and second power switch tube turn-on and turn-off in turn.
The control device of power switch tube in electromagnetism cooking pot according to an embodiment of the present invention, drive module can be to master control moulds The inceptive impulse signal of block output is handled to obtain the first driving signal and the second driving signal, and passes through the first driving letter Number to the first power switch tube carry out drive control and by the second driving signal to the second power switch tube carry out drive control, To control the first power switch tube and the second power switch tube turn-on and turn-off in turn, thereby, it is possible to control two function in parallel Rate switching tube turn-on and turn-off in turn distribute unbalanced phenomenon to avoid the electric current for occurring flowing through power switch tube, improve function The reliability of rate switching tube, so as to guarantee the normal use of electromagnetism cooking pot.
In addition, the control device of power switch tube can be in the electromagnetism cooking pot proposed according to that above embodiment of the present invention With following additional technical characteristic:
Specifically, the drive module includes: signal processing unit, and the signal processing unit includes inceptive impulse signal Receiving end, the signal processing unit are used to receive the inceptive impulse signal by the inceptive impulse signal receiving end, and The inceptive impulse signal is handled to obtain the first driving signal and the second driving signal；Driving unit, the driving Unit includes the first driving circuit and the second driving circuit, and first driving circuit is used to carry out first driving signal Drive amplification, and the first driving signal after drive amplification is exported into the driving end to first power switch tube to described First power switch tube carries out drive control, and second driving circuit is used to carry out second driving signal driving to put Greatly, and by the second driving signal after drive amplification it exports to the driving end of second power switch tube to second function Rate switching tube carries out drive control.
In one embodiment of the invention, when first driving signal is high level, second driving signal is Low level；When second driving signal is high level, first driving signal is low level.
Specifically, the signal processing unit includes: the first frequency-halving circuit, the input terminal of first frequency-halving circuit It is connected with the inceptive impulse signal receiving end；First not circuit, the input terminal of first not circuit and described first The output end of frequency-halving circuit is connected；First AND gate circuit, the first input end of first AND gate circuit and the initial arteries and veins Signal receiving end is rushed to be connected, the second input terminal of first AND gate circuit is connected with the output end of first not circuit, The output end of first AND gate circuit is for exporting first driving signal；Second AND gate circuit, described second is electric with door The first input end on road is connected with the inceptive impulse signal receiving end, the second input terminal of second AND gate circuit with it is described The output end of first frequency-halving circuit is connected, and the output end of second AND gate circuit is for exporting second driving signal.
Further, the signal processing unit further includes enable end, and the signal processing unit also passes through described enabled End receives the enable signal that the main control module is sent, wherein when the enable signal is low level, the signal processing list Member generates first driving signal and the second driving signal according to the inceptive impulse signal.
In one embodiment of the invention, the signal processing unit includes: the second frequency-halving circuit, and the described 2nd 2 The input terminal of frequency dividing circuit is connected with the inceptive impulse signal receiving end；Second not circuit, second not circuit Input terminal is connected with the output end of second frequency-halving circuit；Third AND gate circuit, the first of the third AND gate circuit are defeated Enter end to be connected with the inceptive impulse signal receiving end, the second input terminal of the third AND gate circuit and second NOT gate electricity The output end on road is connected；4th AND gate circuit, first input end and the inceptive impulse signal of the 4th AND gate circuit connect Receiving end is connected, and the second input terminal of the 4th AND gate circuit is connected with the output end of second frequency-halving circuit；Third is non- The input terminal of gate circuit, the third not circuit is connected with the enable end；5th AND gate circuit, the 5th AND gate circuit First input end be connected with the output end of the third AND gate circuit, the second input terminal of the 5th AND gate circuit with it is described The output end of third not circuit is connected；6th AND gate circuit, the first input end and the described 4th of the 6th AND gate circuit The output end of AND gate circuit is connected, the output end phase of the second input terminal and the third not circuit of the 6th AND gate circuit Even；The first input end of 7th AND gate circuit, the 7th AND gate circuit is connected with the enable end, the 7th AND gate circuit The second input terminal be connected with the inceptive impulse signal receiving end；First OR circuit, the first of first OR circuit Input terminal is connected with the output end of the 5th AND gate circuit, the second input terminal of first OR circuit with the described 7th with The output end of gate circuit is connected, and the output end of first OR circuit is for exporting first driving signal；Second or door Circuit, the first input end of second OR circuit are connected with the output end of the 6th AND gate circuit, and described second or door Second input terminal of circuit is connected with the output end of the 7th AND gate circuit, and the output end of second OR circuit is for defeated Second driving signal out.
In one embodiment of the invention, the main control module is also used to obtain the heating function of the electromagnetism cooking pot Rate, and judge whether the heating power is more than or equal to predetermined power threshold value, wherein it is more than or equal in the heating power described When predetermined power threshold value, the main control module sends the enabled letter of high level to the signal processing unit by the enable end Number, it simultaneously turns on and turns off to control first power switch tube and second power switch tube；In the heating power When less than the predetermined power threshold value, the main control module sends low level to the signal processing unit by the enable end Enable signal, to control first power switch tube and second power switch tube turn-on and turn-off in turn.
In one embodiment of the invention, first driving circuit includes: first resistor, and the one of the first resistor Hold the input terminal as first driving signal；First triode, the base stage and the first resistor of first triode The other end be connected；Second resistance, one end of the second resistance are connected with the other end of the first resistor, second electricity The other end of resistance is connected to default power supply；3rd resistor, the other end phase of one end of the 3rd resistor and the second resistance Even, the other end of the 3rd resistor is connected with the collector of first triode；Second triode, second triode Base stage be connected with the other end of the first resistor, the transmitting of the emitter of second triode and first triode Extremely it is connected, the grounded collector of second triode；4th resistance, one end of the 4th resistance and first triode Emitter be connected, the other end of the 4th resistance is connected with the driving end of first power switch tube；5th resistance, institute The one end for stating the 5th resistance is connected with the other end of the 4th resistance, the other end ground connection of the 5th resistance.
In one embodiment of the invention, second driving circuit includes: the 6th resistance, and the one of the 6th resistance Hold the input terminal as second driving signal；Third transistor, the base stage of the third transistor and the 6th resistance The other end be connected；One end of 7th resistance, the 7th resistance is connected with the other end of the 6th resistance, the 7th electricity The other end of resistance is connected to default power supply；8th resistance, one end of the 8th resistance and the other end phase of the 7th resistance Even, the other end of the 8th resistance is connected with the collector of the third transistor；4th triode, the 4th triode Base stage be connected with the other end of the 6th resistance, the transmitting of the emitter of the 4th triode and the third transistor Extremely it is connected, the grounded collector of the 4th triode；9th resistance, one end of the 9th resistance and the third transistor Emitter be connected, the other end of the 9th resistance is connected with the driving end of second power switch tube；Tenth resistance, institute The one end for stating the tenth resistance is connected with the other end of the 9th resistance, the other end ground connection of the tenth resistance.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of electromagnetism cooking pot comprising the present invention The control device of power switch tube in the electromagnetism cooking pot that first aspect embodiment proposes.
Electromagnetism cooking pot according to an embodiment of the present invention can control two power switch tubes in parallel and be connected and close in turn It is disconnected, unbalanced phenomenon is distributed to avoid the electric current for occurring flowing through power switch tube, improves the reliability of power switch tube, thus It can guarantee its normal use.
In order to achieve the above objectives, third aspect present invention embodiment proposes power switch tube in a kind of electromagnetism cooking pot Control method, the electromagnetism cooking pot include the first power switch tube and the second power switch tube parallel with one another, the control Method is the following steps are included: input inceptive impulse signal；The inceptive impulse signal is handled to obtain the first driving letter Number and the second driving signal, and first power switch tube drive control and pass through by first driving signal Second driving signal carries out drive control to second power switch tube, to control first power switch tube and institute State the second power switch tube turn-on and turn-off in turn.
The control method of power switch tube in electromagnetism cooking pot according to an embodiment of the present invention carries out inceptive impulse signal Processing drives the first power switch tube by the first driving signal with obtaining the first driving signal and the second driving signal Dynamic control and drive control is carried out to the second power switch tube by the second driving signal, to control the first power switch tube and the Two power switch tubes turn-on and turn-off in turn, thereby, it is possible to control two power switch tubes in parallel turn-on and turn-off in turn, with The unbalanced phenomenon of electric current distribution for flowing through power switch tube is avoided the occurrence of, the reliability of power switch tube is improved, so as to Guarantee the normal use of electromagnetism cooking pot.
Detailed description of the invention
Fig. 1 is the circuit structure diagram according to the electromagnetic heating system of one embodiment of the invention；
Fig. 2 is the block diagram according to the control device of power switch tube in the electromagnetism cooking pot of the embodiment of the present invention；
Fig. 3 is to be illustrated according to the box of the control device of power switch tube in the electromagnetism cooking pot of one embodiment of the invention Figure；
Fig. 4 is according to the first driving circuit of one embodiment of the invention and the circuit structure diagram of the second driving circuit；
Fig. 5 is to be shown according to the box of the control device of power switch tube in the electromagnetism cooking pot of another embodiment of the present invention It is intended to；
Fig. 6 is the output of the control device of power switch tube in the electromagnetism cooking pot according to a specific embodiment of the invention Waveform diagram；
Fig. 7 is that the box of the control device of power switch tube in the electromagnetism cooking pot according to another embodiment of the invention shows It is intended to；
Fig. 8 is to be shown according to the box of the control device of power switch tube in the electromagnetism cooking pot of further embodiment of the present invention It is intended to；
Fig. 9 is the output waveform according to the control device of power switch tube in the electromagnetism cooking pot of one embodiment of the invention Figure；
Figure 10 is the output according to the control device of power switch tube in the electromagnetism cooking pot of another embodiment of the present invention Waveform diagram；
Figure 11 is the flow chart according to the control method of power switch tube in the electromagnetism cooking pot of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawing come describe the embodiment of the present invention electromagnetism cooking pot and its power switch tube control device and Method.
The electromagnetism cooking pot of the embodiment of the present invention may include two the first power switch tubes and the second power parallel with one another Switching tube.Wherein, electromagnetism cooking pot can be electromagnetic oven, electromagnetism rice cooker etc..
In one embodiment of the invention, as shown in Figure 1, electromagnetic heating system may include being connected to by protective tube F1 The rectifier bridge D1 of mains supply, filter inductance L1, filter capacitor C1, resonant inductance L2, resonant capacitance C2, two it is parallel with one another First power switch tube and the second power switch tube, main control chip U1, voltage zero-crossing detection circuit module U2, power switch tube are driven Dynamic model block U3 and other circuit modules U4.Wherein, resonant inductance L2 is configured to heating spool rest, and resonant capacitance C2 constitute it is humorous Shake circuit, main control chip U1 to power switch tube drives module U3 issue pulse signal, power switch tube drives module U3 according to Pulse signal generates driving signal with driving power switching tube turn-on and turn-off, so that controlling resonance circuit carries out resonant operational, To realize the heating to the pot body POT of apparatus body.
Fig. 2 is the block diagram according to the control device of power switch tube in the electromagnetism cooking pot of the embodiment of the present invention.
As shown in Fig. 2, in the electromagnetism cooking pot of the embodiment of the present invention power switch tube control device, comprising: master control mould Block 10 and drive module 20.
Wherein, main control module 10 can be used for exporting inceptive impulse signal；Drive module 20 can be used for inceptive impulse signal Handled to obtain the first driving signal and the second driving signal, and by the first driving signal to the first power switch tube into Row drive control and by the second driving signal to the second power switch tube carry out drive control, to control the first power switch tube With the second power switch tube turn-on and turn-off in turn.
In one embodiment of the invention, main control module 10 can determine whether resonance circuit resonance potential whether zero crossing, And inceptive impulse signal is issued in the resonance potential zero crossing of resonance circuit.
In one embodiment of the invention, as shown in figure 3, drive module 20 may include signal processing unit 100 and drive Moving cell 200.Wherein, signal processing unit 100 includes inceptive impulse signal receiving end a, and signal processing unit 100 is for passing through Inceptive impulse signal receiving end a receives inceptive impulse signal, and is handled inceptive impulse signal to obtain the first driving letter Number and the second driving signal；Driving unit 200 may include the first driving circuit 210 and the second driving circuit 220, the first driving electricity Road 210 is used to carry out drive amplification to the first driving signal, and the first driving signal after drive amplification is exported to the first function To carry out drive control to the first power switch tube, the second driving circuit 220 is used to drive to second at the driving end of rate switching tube Signal carries out drive amplification, and the second driving signal after drive amplification is exported the driving end to the second power switch tube with right Second power switch tube carries out drive control.
In one embodiment of the invention, when the first driving signal is high level, the second driving signal is low level；The When two driving signal is high level, the first driving signal is low level.
That is, when the first driving signal be high level, and the second driving signal be low level when, the first driving signal By the drive amplification of the first driving circuit 210, and after being input to the first power switch tube, controllable first power switch tube is led Logical, the second driving signal passes through the drive amplification of the second driving circuit 220, and after being input to the second power switch tube, can control The shutdown of second power switch tube；When the first driving signal is low level, and the second driving signal is high level, the first driving letter Number by the first driving circuit 210 drive amplification, and after being input to the first power switch tube, can control the first power switch tube Shutdown, the second driving signal pass through the drive amplification of the second driving circuit 220, and after being input to the second power switch tube, controllably Make the conducting of the second power switch tube.
Wherein, as shown in figure 4, the first driving circuit 210 can include: first resistor R1, the first triode Q1, second resistance R2,3rd resistor R3, the second triode Q2, the 4th resistance R4 and the 5th resistance R5.Wherein, one end of first resistor R1 is as The input terminal of one driving signal；The base stage of first triode Q1 is connected with the other end of first resistor；One end of second resistance R2 It is connected with the other end of first resistor R1, the other end of second resistance R2 is connected to default power supply Vdd；One end of 3rd resistor R3 It is connected with the other end of second resistance R2, the other end of 3rd resistor R3 is connected with the collector of the first triode Q1；Two or three The base stage of pole pipe Q2 is connected with the other end of first resistor R1, the transmitting of the emitter of the second triode Q2 and the first triode Q1 Extremely it is connected, the grounded collector of the second triode Q2；One end of 4th resistance R4 is connected with the emitter of the first triode Q1, the The other end of four resistance R4 is connected with the driving end of the first power switch tube；One end of 5th resistance R5 is another with the 4th resistance R4's One end is connected, the other end ground connection of the 5th resistance R5.
Second driving circuit 220 may include the 6th resistance R6, third transistor Q3, the 7th resistance R7, the 8th resistance R8, Four triode Q4, the 9th resistance R9 and the tenth resistance R10.Wherein, one end of the 6th resistance R6 is as the defeated of the second driving signal Enter end；The base stage of third transistor Q3 is connected with the other end of the 6th resistance R6；One end of 7th resistance R7 and the 6th resistance R6 The other end be connected, the other end of the 7th resistance R7 is connected to default power supply Vdd；One end of 8th resistance R8 and the 7th resistance R7 The other end be connected, the other end of the 8th resistance R8 is connected with the collector of third transistor Q3；The base stage of 4th triode Q4 It is connected with the other end of the 6th resistance R6, the emitter of the 4th triode Q4 is connected with the emitter of third transistor Q3, and the 4th The grounded collector of triode Q4；One end of 9th resistance R9 is connected with the emitter of third transistor Q3, the 9th resistance R9's The other end is connected with the driving end of the second power switch tube；One end of tenth resistance R10 is connected with the other end of the 9th resistance R9, The other end of tenth resistance R10 is grounded.
In one embodiment of the invention, as shown in figure 5, signal processing unit 100 may include the first frequency-halving circuit A1, the first not circuit NG1, the first AND gate circuit AG1 and the second AND gate circuit AG2.Wherein, the first frequency-halving circuit A1's is defeated Enter end to be connected with inceptive impulse signal receiving end a；The input terminal of first not circuit NG1 and the output end of the first frequency-halving circuit B is connected；The first input end of first AND gate circuit AG1 is connected with inceptive impulse signal receiving end a, the first AND gate circuit AG1's Second input terminal is connected with the output end of the first not circuit NG1, and the output end of the first AND gate circuit AG1 drives for exporting first Dynamic signal；The first input end of second AND gate circuit AG2 is connected with inceptive impulse signal receiving end a, the second AND gate circuit AG2's Second input terminal is connected with the output end b of the first frequency-halving circuit A1, and the output end of the second AND gate circuit AG2 is for exporting second Driving signal.
In one particular embodiment of the present invention, main control module 10 can be the main control chip U1 in Fig. 1, drive module 20 The mode of d type flip flop can be used to as shown in Figure 6 for power switch tube drives the module U, the first frequency-halving circuit A1 in Fig. 1 Inceptive impulse signal (the corresponding signal of a in Fig. 6) handled, and from output end b export a two divided-frequency as shown in FIG. 6 Signal, the two divided-frequency signal can be input to the first input end of the first AND gate circuit AG1 after the first not circuit NG1, The second input terminal of the second AND gate circuit AG2 can be directly inputted to.
As shown in fig. 6, when inceptive impulse signal is high level, and the output end b output of the first frequency-halving circuit A1 When two divided-frequency signal is high level, the first input end of the first AND gate circuit AG1 can input high level signal, two divided-frequency signal warp Exportable low level signal after the first not circuit NG1 is crossed, which can be input to the second of the first AND gate circuit AG1 Input terminal, the first driving signal of the output end output of the first AND gate circuit AG1 is low level as a result,；Second AND gate circuit AG2 First input end can input high level signal, two divided-frequency signal can be directly inputted to the second AND gate circuit AG2 first input End, the second driving signal of the output end output of the second AND gate circuit AG2 is high level as a result,.
When inceptive impulse signal is low level, and the two divided-frequency signal of the output end b output of the first frequency-halving circuit A1 When for high level, the first input end of the first AND gate circuit AG1 can input low level signal, two divided-frequency signal passes through the first NOT gate Exportable low level signal after circuit NG1, the low level signal can be input to the second input terminal of the first AND gate circuit AG1, by This, the first driving signal of the output end output of the first AND gate circuit 130 is low level；The first of second AND gate circuit AG2 is defeated Enter end can input low level signal, two divided-frequency signal can be directly inputted to the first input end of the second AND gate circuit AG2, thus Second driving signal of the output end output of two AND gate circuit AG2 is low level.
When inceptive impulse signal is high level, and the two divided-frequency signal of the output end b output of the first frequency-halving circuit A1 When for low level, the first input end of the first AND gate circuit AG1 can input high level signal, two divided-frequency signal passes through the first NOT gate Exportable high level signal after circuit NG1, the high level signal can be input to the second input terminal of the first AND gate circuit AG1, by This, the first driving signal of the output end output of the first AND gate circuit AG1 is high level；The first of second AND gate circuit AG2 is defeated Enter end can input high level signal, two divided-frequency signal can be directly inputted to the first input end of the second AND gate circuit AG2, thus Second driving signal of the output end output of two AND gate circuit AG2 is low level.
When inceptive impulse signal is low level, and the two divided-frequency signal of the output end b output of the first frequency-halving circuit A1 When for low level, the first input end of the first AND gate circuit AG1 can input low level signal, two divided-frequency signal passes through the first NOT gate Exportable high level signal after circuit NG1, the high level signal can be input to the second input terminal of the first AND gate circuit AG1, by This, the first driving signal of the output end output of the first AND gate circuit AG1 is low level；The first of second AND gate circuit AG2 is defeated Enter end can input low level signal, two divided-frequency signal can be directly inputted to the first input end of the second AND gate circuit AG2, as a result, Second driving signal of the output end output of the second AND gate circuit AG2 is low level.
Based on foregoing circuit structure, signal processing unit 100 can be obtained two not after handling inceptive impulse signal Same driving signal, i.e. the first driving signal and the second driving signal.First driving signal drives by the first driving circuit 210 Amplification, and the second driving signal can control the first power switch tube and second after the drive amplification of the second driving circuit 220 Power switch tube is connected in turn, distributes unbalanced phenomenon to avoid the electric current for occurring flowing through power switch tube, improves power and open The reliability of pipe is closed, so as to guarantee the normal use of electromagnetism cooking pot.
In one embodiment of the invention, as shown in fig. 7, signal processing unit 100 further includes enable end EN, at signal Managing unit can also receive the enable signal that main control module 10 is sent by enable end EN, wherein when enable signal is low level, Signal processing unit 100 generates the first driving signal and the second driving signal according to inceptive impulse signal.
In one embodiment of the invention, as shown in figure 8, signal processing unit 100 may include the second frequency-halving circuit A2, the second not circuit NG2, third AND gate circuit AG3, the 4th AND gate circuit AG4, third not circuit NG3, the 5th and door electricity Road AG5, the 6th AND gate circuit AG6, the 7th AND gate circuit AG7, the first OR circuit OG1 and the second OR circuit OG2.Wherein, The input terminal of second frequency-halving circuit A2 is connected with inceptive impulse signal receiving end a；The input terminal of second not circuit NG2 and The output end c of two frequency-halving circuits is connected；The first input end of third AND gate circuit AG3 and inceptive impulse signal receiving end a phase Even, the second input terminal of third AND gate circuit NG2 is connected with the output end of the second not circuit NG2；4th AND gate circuit AG4's First input end is connected with inceptive impulse signal receiving end a, the second input terminal of the 4th AND gate circuit AG4 and the second two divided-frequency electricity The output end c of road A2 is connected；The input terminal of third not circuit NG3 is connected with enable end EN；The first of 5th AND gate circuit AG5 Input terminal is connected with the output end d1 of third AND gate circuit AG3, the second input terminal and third the NOT gate electricity of the 5th AND gate circuit AG5 The output end of road NG3 is connected；The first input end of 6th AND gate circuit AG6 is connected with the output end d2 of the 4th AND gate circuit AG4, The second input terminal of 6th AND gate circuit AG6 is connected with the output end e3 of third not circuit NG3；7th AND gate circuit AG7's First input end is connected with enable end EN, the second input terminal and the inceptive impulse signal receiving end a phase of the 7th AND gate circuit AG7 Even；The first input end of first OR circuit OG1 is connected with the output end e1 of the 5th AND gate circuit AG5, the first OR circuit OG1 The second input terminal be connected with the output end of the 7th AND gate circuit AG7, the output end of the first OR circuit OG1 is for exporting first Driving signal；The first input end of second OR circuit OG2 is connected with the output end e2 of the 6th AND gate circuit AG6, and second or door The second input terminal of circuit OG2 is connected with the output end of the 7th AND gate circuit AG7, and the output end of the second OR circuit OG2 is used for Export the second driving signal.
In one embodiment of the invention, main control module 10 is also used to obtain the heating power of electromagnetism cooking pot, and sentences Whether disconnected heating power is more than or equal to predetermined power threshold value, wherein when heating power is more than or equal to predetermined power threshold value, master control Module 10 by enable end EN to signal processing unit 100 send high level enable signal, with control the first power switch tube and Second power switch tube is simultaneously turned on and is turned off；When heating power is less than predetermined power threshold value, main control module 10 passes through enabled EN is held to send low level enable signal to signal processing unit 100, to control the first power switch tube and the second power switch tube Turn-on and turn-off in turn.Wherein, predetermined power threshold value can be demarcated according to the actual situation, such as predetermined power threshold value can be 1400W。
Specifically, when heating power is more than or equal to predetermined power threshold value, i.e., when heating power is excessively high, as shown in figure 9, master control Module 100 can send high level enable signal to signal processing unit 100 by enable end EN, which passes through Exportable low level signal after third not circuit NG3, the low level signal can be separately input to the of the 5th AND gate circuit AG5 Second input terminal of two input terminals and the 6th AND gate circuit AG6, so that the output end e1 and the 6th and door of the 5th AND gate circuit AG5 The output end e2 of circuit AG6 can export low level respectively, and be separately input to the first input end and of the first OR circuit OG1 The first input end of two OR circuit OG2；It is first defeated can be also directly inputted to the 7th AND gate circuit AG7 for high level enable signal Enter end, so that the signal that the output end e3 of the 7th AND gate circuit AG7 is exported is identical as inceptive impulse signal, the 7th AND gate circuit The signal of the output end output of AG7 can input the second input terminal and the second OR circuit OG2 of the first OR circuit OG1 respectively Second input terminal, as a result, the first driving signal and the second OR circuit OG2 of the output end output of the first OR circuit OG1 Second driving signal of output end output is identical as inceptive impulse signal, i.e. the first driving signal and the second driving signal phase Together.First driving signal and the second driving signal pass through the drive amplification of the first driving circuit 210 and the second driving circuit 220 The first power switch tube and the second power switch tube can control to simultaneously turn on and turn off afterwards.
When heating power is less than predetermined power threshold value, i.e., when heating temperature is too low, main control module 10 can pass through enable end EN Low level enable signal as shown in Figure 10 is sent to signal processing unit 100.As shown in Figure 10, when inceptive impulse signal is height When level, and the second frequency dividing circuit B1 output end c output two divided-frequency signal be high level when, third AND gate circuit AG3's First input end can input high level signal, the second frequency dividing circuit output end c output two divided-frequency signal by the second NOT gate electricity Exportable low level signal after the NG2 of road, the low level signal can be input to the second input terminal of third AND gate circuit AG3, as a result, The exportable low level signal of output end d1 of third AND gate circuit AG3, and the low level signal is input to the 5th AND gate circuit The first input end of AG5；The first input end of 4th AND gate circuit AG4 can input high level signal, the second frequency-halving circuit A2 The two divided-frequency signal of output end c output can be directly inputted to the first input end of the 4th AND gate circuit AG4, and as a result, the 4th and door The exportable high level signal of output end d2 of circuit AG4, and the high level signal is input to the first of the 6th AND gate circuit AG6 Input terminal.Low level enable signal exportable high level signal, the high level signal after third not circuit NG3 can be distinguished It is input to the second input terminal of the 5th AND gate circuit AG5 and the second input terminal of the 6th AND gate circuit AG6, so that the 5th is electric with door The signal of the first input end input of the signal and the 5th AND gate circuit AG5 of the output end output of road AG5 is identical, and the 6th and door Circuit AG6 output end output signal and the 6th AND gate circuit AG6 first input end input signal it is identical, i.e., the 5th with The exportable low level signal of the output end of gate circuit AG5, and the exportable high level signal of output end of the 6th AND gate circuit AG6, Wherein, the low level signal of the output end output of the 5th AND gate circuit AG5 can be input to the first input of the first OR circuit OG1 The high level signal at end, the output end output of the 6th AND gate circuit AG6 can be input to the first input of the second OR circuit OG2 End.Low level enable signal can also be directly inputted to the first input end of the 7th AND gate circuit AG7, so that the 7th AND gate circuit The output end e3 of AG7 exports low level signal, and the low level signal of the output end e3 output of the 7th AND gate circuit AG7 can be distinguished The second input terminal of the first OR circuit OG1 and the second input terminal of the second OR circuit OG2 are inputted, to make first or door electricity The signal that the first driving signal of output end output of road OG1 and the first input end of the first OR circuit OG1 input is identical, and The first input end input of the second driving signal and the second OR circuit OG2 of the output end output of second OR circuit OG2 Signal is identical, i.e. the first driving signal of the output end output of the first OR circuit OG1 is low level, the second OR circuit OG2 Output end output the second driving signal be high level, first driving signal and the second driving signal pass through the first drive respectively After the drive amplification of dynamic circuit 210 and the second driving circuit 220, the shutdown of the first power switch tube can control, and the second power is opened Close pipe conducting.
Similarly, when inceptive impulse signal is low level, and the two divided-frequency of the second frequency-halving circuit A2 output end c output When signal is high level, the first driving signal of the output end output of the first OR circuit OG1 is low level, the second OR circuit Second driving signal of the output end output of OG2 is low level；When inceptive impulse signal is high level, and the second two divided-frequency electricity When the two divided-frequency signal of road A2 output end c output is low level, the first driving letter of the output end output of the first OR circuit OG1 Number be high level, the second OR circuit OG2 output end output the second driving signal be low level, first driving signal and Second driving signal after the drive amplification of the first driving circuit 210 and the second driving circuit 220, can control the first function respectively The conducting of rate switching tube, and the second power switch tube turns off；When inceptive impulse signal is low level, and the second frequency-halving circuit A2 When the two divided-frequency signal of output end c output is low level, the first driving signal of the output end output of the first OR circuit OG1 is Second driving signal of low level, the output end output of the second OR circuit OG2 is low level.Control first can be passed through as a result, The change of driving signal and the second driving signal, and first driving signal and the second driving signal are separately input to the first drive It moves in circuit 210 and the second driving circuit 220, and is put by the driving of the first driving circuit 210 and the second driving circuit 220 The turn-on and turn-off in turn of controllable first power switch tube and the second power switch tube after big, cpable of lowering power switching tube is because super Temperature rise caused by preceding conducting, to improve the reliability of power switch tube.
The control device of power switch tube in electromagnetism cooking pot according to an embodiment of the present invention, drive module can be to master control moulds The inceptive impulse signal of block output is handled to obtain the first driving signal and the second driving signal, and passes through the first driving letter Number to the first power switch tube carry out drive control and by the second driving signal to the second power switch tube carry out drive control, To control the first power switch tube and the second power switch tube turn-on and turn-off in turn, thereby, it is possible to control two function in parallel Rate switching tube turn-on and turn-off in turn distribute unbalanced phenomenon to avoid the electric current for occurring flowing through power switch tube, improve function The reliability of rate switching tube, so as to guarantee the normal use of electromagnetism cooking pot.
Corresponding above-described embodiment, the present invention also propose a kind of electromagnetism cooking pot.
The electromagnetism cooking pot of the embodiment of the present invention, including the above embodiment of the present invention propose electromagnetism cooking pot in power open The control device of pipe is closed, specific embodiment can refer to above-described embodiment, and to avoid redundancy, details are not described herein.
Electromagnetism cooking pot according to the present invention can control two power switch tubes in parallel turn-on and turn-off in turn, with The unbalanced phenomenon of electric current distribution for flowing through power switch tube is avoided the occurrence of, the reliability of power switch tube is improved, so as to Guarantee the normal use of electromagnetism cooking pot.
Corresponding above-described embodiment, the present invention also propose a kind of control method of power switch tube in electromagnetism cooking pot.
As shown in figure 11, in the electromagnetism cooking pot of the embodiment of the present invention power switch tube control method, including following step It is rapid:
S1 inputs inceptive impulse signal.
In one embodiment of the invention, can be judged by main control module resonance circuit resonance potential whether zero passage Point, and inceptive impulse signal is issued in the resonance potential zero crossing of resonance circuit.
S2 handles inceptive impulse signal to obtain the first driving signal and the second driving signal, and passes through first Driving signal carries out drive control to the first power switch tube and is driven by the second driving signal to the second power switch tube Dynamic control, to control the first power switch tube and the second power switch tube turn-on and turn-off in turn.
Wherein, inceptive impulse signal can be handled by drive module to obtain the first driving signal and the second driving Signal, and drive control is carried out and by the second driving signal to the second function to the first power switch tube by the first driving signal Rate switching tube carries out drive control, to control the first power switch tube and the second power switch tube turn-on and turn-off in turn.
In one embodiment of the invention, drive module may include signal processing unit and driving unit.Wherein, signal Processing unit may include inceptive impulse signal receiving end, and inceptive impulse signal can be received by inceptive impulse signal receiving end, and Inceptive impulse signal is handled to obtain the first driving signal and the second driving signal；Driving unit may include the first driving Circuit and the second driving circuit can carry out drive amplification to the first driving signal by the first driving circuit, and by drive amplification The first driving signal afterwards is exported to the driving end of the first power switch tube to carry out drive control to the first power switch tube, and Drive amplification can be carried out to the second driving signal by the second driving circuit, and the second driving signal after drive amplification is exported To the driving end of the second power switch tube to carry out drive control to the second power switch tube.
In one embodiment of the invention, when the first driving signal is high level, the second driving signal is low level；The When two driving signal is high level, the first driving signal is low level.
That is, when the first driving signal be high level, and the second driving signal be low level when, the first driving signal By the amplification of the first driving circuit, and after being input to the first power switch tube, the conducting of the first power switch tube can control, second Driving signal passes through the amplification of the second driving circuit, and after being input to the second power switch tube, can control the second power switch tube Shutdown；When the first driving signal is low level, and the second driving signal is high level, the first driving signal is by the first driving The amplification of circuit, and after being input to the first power switch tube, it can control the shutdown of the first power switch tube, the second driving signal is passed through The amplification of second driving circuit, and after being input to the second power switch tube, it can control the conducting of the second power switch tube.
Wherein, the first driving circuit can include: first resistor, the first triode, second resistance, 3rd resistor, the two or three Pole pipe, the 4th resistance and the 5th resistance.Wherein, input terminal of the one end of first resistor as the first driving signal；One or three pole The base stage of pipe is connected with the other end of first resistor；One end of second resistance is connected with the other end of first resistor, second resistance The other end be connected to default power supply；One end of 3rd resistor is connected with the other end of second resistance, the other end of 3rd resistor It is connected with the collector of the first triode；The base stage of second triode is connected with the other end of first resistor, the second triode Emitter is connected with the emitter of the first triode, the grounded collector of the second triode；One end and the one or three of 4th resistance The emitter of pole pipe is connected, and the other end of the 4th resistance is connected with the driving end of the first power switch tube；One end of 5th resistance It is connected with the other end of the 4th resistance, the other end ground connection of the 5th resistance.
Second driving circuit may include the 6th resistance, third transistor, the 7th resistance, the 8th resistance, the 4th triode, Nine resistance and the tenth resistance.Wherein, input terminal of the one end of the 6th resistance as the second driving signal；The base stage of third transistor It is connected with the other end of the 6th resistance；One end of 7th resistance is connected with the other end of the 6th resistance, the other end of the 7th resistance It is connected to default power supply；One end of 8th resistance is connected with the other end of the 7th resistance, the other end and the three or three of the 8th resistance The collector of pole pipe is connected；The base stage of 4th triode is connected with the other end of the 6th resistance, the emitter of the 4th triode with The emitter of third transistor is connected, the grounded collector of the 4th triode；One end of 9th resistance and the hair of third transistor Emitter-base bandgap grading is connected, and the other end of the 9th resistance is connected with the driving end of the second power switch tube；One end of tenth resistance and the 9th electricity The other end of resistance is connected, the other end ground connection of the tenth resistance.
In one embodiment of the invention, signal processing unit may include the first frequency-halving circuit, the first not circuit, First AND gate circuit and the second AND gate circuit.Wherein, the input terminal of the first frequency-halving circuit and inceptive impulse signal receiving end phase Even；The input terminal of first not circuit is connected with the output end of the first frequency-halving circuit；The first input end of first AND gate circuit It is connected with inceptive impulse signal receiving end, the second input terminal of the first AND gate circuit is connected with the output end of the first not circuit, The output end of first AND gate circuit is for exporting the first driving signal；The first input end and inceptive impulse of second AND gate circuit are believed Number receiving end is connected, and the second input terminal of the second AND gate circuit is connected with the output end of the first frequency-halving circuit, second and door it is electric The output end on road is for exporting the second driving signal.
In one particular embodiment of the present invention, the mode of d type flip flop can be used to such as Fig. 6 institute in the first frequency-halving circuit The inceptive impulse signal (the corresponding signal of a in Fig. 6) shown is handled, and exports one two points as shown in FIG. 6 from output end b Frequency signal, the two divided-frequency signal can be input to the first input end of the first AND gate circuit after the first not circuit, can also be straight Connect the second input terminal for being input to the second AND gate circuit.
As shown in fig. 6, when inceptive impulse signal is high level, and the two of the output end b output of the first frequency-halving circuit When fractional frequency signal is high level, the first input end of the first AND gate circuit can input high level signal, two divided-frequency signal is by the Exportable low level signal after one not circuit, the low level signal can be input to the second input terminal of the first AND gate circuit, by This, the first driving signal of the output end output of the first AND gate circuit is low level；The first input end of second AND gate circuit can Input high level signal, two divided-frequency signal can be directly inputted to the first input end of the second AND gate circuit, and second is electric with door as a result, Second driving signal of the output end output on road is high level.
When inceptive impulse signal is low level, and the two divided-frequency signal of the output end b output of the first frequency-halving circuit is When high level, the first input end of the first AND gate circuit can input low level signal, two divided-frequency signal passes through the first not circuit Exportable low level signal afterwards, the low level signal can be input to the second input terminal of the first AND gate circuit, and as a result, first and door First driving signal of the output end output of circuit 130 is low level；The first input end of second AND gate circuit can input low electricity Ordinary mail number, two divided-frequency signal can be directly inputted to the first input end of the second AND gate circuit, thus the output of the second AND gate circuit Second driving signal of end output is low level.
When inceptive impulse signal is high level, and the two divided-frequency signal of the output end b output of the first frequency-halving circuit is When low level, the first input end of the first AND gate circuit can input high level signal, two divided-frequency signal passes through the first not circuit Exportable high level signal afterwards, the high level signal can be input to the second input terminal of the first AND gate circuit, and as a result, first and door First driving signal of the output end output of circuit is high level；The first input end of second AND gate circuit can input high level letter Number, two divided-frequency signal can be directly inputted to the first input end of the second AND gate circuit, and thus the output end of the second AND gate circuit is defeated The second driving signal out is low level.
When inceptive impulse signal is low level, and the two divided-frequency signal of the output end b output of the first frequency-halving circuit is When low level, the first input end of the first AND gate circuit can input low level signal, two divided-frequency signal passes through the first not circuit Exportable high level signal afterwards, the high level signal can be input to the second input terminal of the first AND gate circuit, and as a result, first and door First driving signal of the output end output of circuit is low level；The first input end of second AND gate circuit can input low level letter Number, two divided-frequency signal can be directly inputted to the first input end of the second AND gate circuit, and the output end of the second AND gate circuit is defeated as a result, The second driving signal out is low level.
In one embodiment of the invention, signal processing unit further includes enable end, and signal processing unit can also pass through Enable end receives the enable signal that main control module is sent, wherein when enable signal is low level, signal processing unit is according to just Initial pulse signal generates the first driving signal and the second driving signal.
In one embodiment of the invention, signal processing unit may include the second frequency-halving circuit, the second not circuit, Third AND gate circuit, the 4th AND gate circuit, third not circuit, the 5th AND gate circuit, the 6th AND gate circuit, the 7th and door electricity Road, the first OR circuit and the second OR circuit.Wherein, the input terminal of the second frequency-halving circuit and inceptive impulse signal receiving end It is connected；The input terminal of second not circuit is connected with the output end of the second frequency-halving circuit；First input of third AND gate circuit End is connected with inceptive impulse signal receiving end, the output end phase of the second input terminal and the second not circuit of third AND gate circuit Even；The first input end of 4th AND gate circuit is connected with inceptive impulse signal receiving end, the second input terminal of the 4th AND gate circuit It is connected with the output end of the second frequency-halving circuit；The input terminal of third not circuit is connected with enable end；5th AND gate circuit First input end is connected with the output end of third AND gate circuit, the second input terminal and the third not circuit of the 5th AND gate circuit Output end is connected；The first input end of 6th AND gate circuit is connected with the output end of the 4th AND gate circuit, the 6th AND gate circuit Second input terminal is connected with the output end of third not circuit；The first input end of 7th AND gate circuit is connected with enable end, the Second input terminal of seven AND gate circuits is connected with inceptive impulse signal receiving end；The first input end of first OR circuit and the 5th The output end of AND gate circuit is connected, and the second input terminal of the first OR circuit is connected with the output end of the 7th AND gate circuit, and first The output end of OR circuit is for exporting the first driving signal；The first input end of second OR circuit and the 6th AND gate circuit Output end is connected, and the second input terminal of the second OR circuit is connected with the output end of the 7th AND gate circuit, the second OR circuit Output end is for exporting the second driving signal.
In one embodiment of the invention, main control module is also used to obtain the heating power of electromagnetism cooking pot, and judges Whether heating power is more than or equal to predetermined power threshold value, wherein when heating power is more than or equal to predetermined power threshold value, master control mould Block sends high level enable signal to signal processing unit by enable end, is opened with controlling the first power switch tube and the second power Pipe is closed to simultaneously turn on and turn off；When heating power is less than predetermined power threshold value, main control module passes through enable end to signal processing Unit sends low level enable signal, to control the first power switch tube and the second power switch tube turn-on and turn-off in turn.Its In, predetermined power threshold value can be demarcated according to the actual situation, such as predetermined power threshold value can be 1400W.
Specifically, when heating power is more than or equal to predetermined power threshold value, i.e., as shown in Figure 10, main when heating power is excessively high High level enable signal can be sent to signal processing unit by enable end by controlling module, and the high level enable signal is non-by third Exportable low level signal after gate circuit, the low level signal can be separately input to the second input terminal and of the 5th AND gate circuit Second input terminal of six AND gate circuits, so that the output end e1 of the 5th AND gate circuit and the output end e2 of the 6th AND gate circuit can divide Not Shu Chu low level, and be separately input to the first input end of the first OR circuit and the first input end of the second OR circuit； High level enable signal can also be directly inputted to the first input end of the 7th AND gate circuit, so that the output end of the 7th AND gate circuit The signal of e3 output is identical with inceptive impulse signal, the signal that the output end of the 7th AND gate circuit exports can input respectively first or Second input terminal of gate circuit and the second input terminal of the second OR circuit, the output end of the first OR circuit exports as a result, Second driving signal of the output end of the first driving signal and the second OR circuit output is identical as inceptive impulse signal, i.e., and the One driving signal is identical with the second driving signal.First driving signal and the second driving signal are by the first driving circuit and the The first power switch tube and the second power switch tube can control to simultaneously turn on and turn off after the drive amplification of two driving circuits.
When heating power is less than predetermined power threshold value, i.e., when heating temperature is too low, main control module can be by enable end to letter Number processing unit sends low level enable signal as shown in figure 11.As shown in figure 11, when inceptive impulse signal is high level, And second frequency dividing circuit output end c output two divided-frequency signal be high level when, the first input end of third AND gate circuit can The two divided-frequency signal of input high level signal, the second frequency dividing circuit output end c output is exportable low after the second not circuit Level signal, the low level signal can be input to the second input terminal of third AND gate circuit, the output of third AND gate circuit as a result, The exportable low level signal of d1 is held, and the low level signal is input to the first input end of the 5th AND gate circuit；4th and door The first input end of circuit can input high level signal, the second frequency-halving circuit output end c output two divided-frequency signal can be straight The first input end for being input to the 4th AND gate circuit is connect, as a result, the exportable high level signal of output end d2 of the 4th AND gate circuit, And the high level signal is input to the first input end of the 6th AND gate circuit.Low level enable signal passes through third not circuit Exportable high level signal afterwards, the high level signal can be separately input to the second input terminal and the 6th and door of the 5th AND gate circuit Second input terminal of circuit, so that the first input end of signal and the 5th AND gate circuit that the output end of the 5th AND gate circuit exports The signal of input is identical, and the first input end input of the signal of the output end output of the 6th AND gate circuit and the 6th AND gate circuit Signal it is identical, i.e. the exportable low level signal of output end of the 5th AND gate circuit, and the output end of the 6th AND gate circuit can be defeated High level signal out, wherein the low level signal of the output end output of the 5th AND gate circuit can be input to the first OR circuit The high level signal of first input end, the output end output of the 6th AND gate circuit can be input to the first input of the second OR circuit End.Low level enable signal can also be directly inputted to the first input end of the 7th AND gate circuit, so that the 7th AND gate circuit is defeated Outlet e3 export low level signal, the 7th AND gate circuit output end e3 output low level signal can input respectively first or Second input terminal of gate circuit and the second input terminal of the second OR circuit, so that the output end of the first OR circuit be made to export The signal that the first input end of first driving signal and the first OR circuit inputs is identical, and the output end of the second OR circuit is defeated The signal that the first input end of the second driving signal out and the second OR circuit inputs is identical, i.e. the output of the first OR circuit First driving signal of end output is low level, and the second driving signal of the output end output of the second OR circuit is high level, First driving signal and the second driving signal, can respectively after the drive amplification of the first driving circuit and the second driving circuit The shutdown of the first power switch tube is controlled, and the second power switch tube is connected.Similarly, when inceptive impulse signal is low level, And second frequency-halving circuit output end c output two divided-frequency signal be high level when, the first OR circuit output end output First driving signal is low level, and the second driving signal of the output end output of the second OR circuit is low level；When initial arteries and veins Rush signal be high level when, and the second frequency-halving circuit output end c output two divided-frequency signal be low level when, first or door electricity First driving signal of the output end output on road is high level, and the second driving signal of the output end output of the second OR circuit is The driving that low level, first driving signal and the second driving signal pass through the first driving circuit and the second driving circuit respectively is put After big, the conducting of the first power switch tube can control, and the second power switch tube turns off；When inceptive impulse signal is low level, And second frequency-halving circuit output end c output two divided-frequency signal be low level when, the first OR circuit output end output First driving signal is low level, and the second driving signal of the output end output of the second OR circuit is low level.It can lead to as a result, The change of control the first driving signal and the second driving signal is crossed, and first driving signal and the second driving signal difference is defeated Enter into the first driving circuit and the second driving circuit, and by the drive amplification of the first driving circuit and the second driving circuit It can control the turn-on and turn-off in turn of the first power switch tube and the second power switch tube afterwards, cpable of lowering power switching tube is because advanced Temperature rise caused by conducting, to improve the reliability of power switch tube.
The control method of power switch tube in electromagnetism cooking pot according to an embodiment of the present invention carries out inceptive impulse signal Processing drives the first power switch tube by the first driving signal with obtaining the first driving signal and the second driving signal Dynamic control and drive control is carried out to the second power switch tube by the second driving signal, to control the first power switch tube and the Two power switch tubes turn-on and turn-off in turn, thereby, it is possible to control two power switch tubes in parallel turn-on and turn-off in turn, with It avoids power switch tube from the phenomenon that current-unbalance occur, improves the reliability of power switch tube, so as to guarantee that electromagnetism is cooked It prepares food the normal use of device.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more, Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below " One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned Embodiment is changed, modifies, replacement and variant.

Claims (11)

1. the control device of power switch tube in a kind of electromagnetism cooking pot, which is characterized in that the electromagnetism cooking pot includes mutual First power switch tube and the second power switch tube in parallel, the control device include:
Main control module, the main control module is for exporting inceptive impulse signal；
Drive module, the drive module obtain the first driving signal and for being handled the inceptive impulse signal Two driving signal, and drive control carried out to first power switch tube by first driving signal and by described the Two driving signal carries out drive control to second power switch tube, to control first power switch tube and described second Power switch tube turn-on and turn-off in turn.
2. the control device of power switch tube in electromagnetism cooking pot according to claim 1, which is characterized in that the driving Module includes:
Signal processing unit, the signal processing unit include inceptive impulse signal receiving end, and the signal processing unit is used for Receive the inceptive impulse signal by the inceptive impulse signal receiving end, and to the inceptive impulse signal handled with Obtain the first driving signal and the second driving signal；
Driving unit, the driving unit include the first driving circuit and the second driving circuit, and first driving circuit is used for Drive amplification is carried out to first driving signal, and the first driving signal after drive amplification is exported to first power To carry out drive control to first power switch tube, second driving circuit is used for described the at the driving end of switching tube Two driving signal carries out drive amplification, and the second driving signal after drive amplification is exported to second power switch tube End is driven to carry out drive control to second power switch tube.
3. the control device of power switch tube in electromagnetism cooking pot according to claim 2, which is characterized in that wherein, institute State the first driving signal be high level when, second driving signal be low level；When second driving signal is high level, First driving signal is low level.
4. the control device of power switch tube in electromagnetism cooking pot according to claim 2, which is characterized in that the signal Processing unit includes:
First frequency-halving circuit, the input terminal of first frequency-halving circuit are connected with the inceptive impulse signal receiving end；
First not circuit, the input terminal of first not circuit are connected with the output end of first frequency-halving circuit；
First AND gate circuit, the first input end of first AND gate circuit are connected with the inceptive impulse signal receiving end, institute The second input terminal for stating the first AND gate circuit is connected with the output end of first not circuit, first AND gate circuit it is defeated Outlet is for exporting first driving signal；
Second AND gate circuit, the first input end of second AND gate circuit are connected with the inceptive impulse signal receiving end, institute The second input terminal for stating the second AND gate circuit is connected with the output end of first frequency-halving circuit, second AND gate circuit Output end is for exporting second driving signal.
5. the control device of power switch tube in electromagnetism cooking pot according to claim 2, which is characterized in that the signal Processing unit further includes enable end, and the signal processing unit also passes through the enable end and receives making for the main control module transmission Energy signal, wherein when the enable signal is low level, the signal processing unit is generated according to the inceptive impulse signal First driving signal and the second driving signal.
6. the control device of power switch tube in electromagnetism cooking pot according to claim 5, which is characterized in that the signal Processing unit includes:
Second frequency-halving circuit, the input terminal of second frequency-halving circuit are connected with the inceptive impulse signal receiving end；
Second not circuit, the input terminal of second not circuit are connected with the output end of second frequency-halving circuit；
Third AND gate circuit, the first input end of the third AND gate circuit are connected with the inceptive impulse signal receiving end, institute The second input terminal for stating third AND gate circuit is connected with the output end of second not circuit；
The first input end of 4th AND gate circuit, the 4th AND gate circuit is connected with the inceptive impulse signal receiving end, institute The second input terminal for stating the 4th AND gate circuit is connected with the output end of second frequency-halving circuit；
The input terminal of third not circuit, the third not circuit is connected with the enable end；
The first input end of 5th AND gate circuit, the 5th AND gate circuit is connected with the output end of the third AND gate circuit, Second input terminal of the 5th AND gate circuit is connected with the output end of the third not circuit；
The first input end of 6th AND gate circuit, the 6th AND gate circuit is connected with the output end of the 4th AND gate circuit, Second input terminal of the 6th AND gate circuit is connected with the output end of the third not circuit；
The first input end of 7th AND gate circuit, the 7th AND gate circuit is connected with the enable end, and the described 7th is electric with door Second input terminal on road is connected with the inceptive impulse signal receiving end；
First OR circuit, the first input end of first OR circuit are connected with the output end of the 5th AND gate circuit, Second input terminal of first OR circuit is connected with the output end of the 7th AND gate circuit, first OR circuit Output end is for exporting first driving signal；
Second OR circuit, the first input end of second OR circuit are connected with the output end of the 6th AND gate circuit, Second input terminal of second OR circuit is connected with the output end of the 7th AND gate circuit, second OR circuit Output end is for exporting second driving signal.
7. the control device of power switch tube in electromagnetism cooking pot according to claim 6, which is characterized in that the master control Module is also used to obtain the heating power of the electromagnetism cooking pot, and judges whether the heating power is more than or equal to predetermined power Threshold value, wherein
When the heating power is more than or equal to the predetermined power threshold value, the main control module is by the enable end to described Signal processing unit sends high level enable signal, same to control first power switch tube and second power switch tube When turn-on and turn-off；
When the heating power is less than the predetermined power threshold value, the main control module passes through the enable end to the signal Processing unit sends low level enable signal, to control first power switch tube and the second power switch tube wheel conductance Logical and shutdown.
8. the control device of power switch tube in electromagnetism cooking pot according to claim 2, which is characterized in that described first Driving circuit includes:
First resistor, input terminal of the one end of the first resistor as first driving signal；
The base stage of first triode, first triode is connected with the other end of the first resistor；
Second resistance, one end of the second resistance are connected with the other end of the first resistor, the second resistance it is another End is connected to default power supply；
3rd resistor, one end of the 3rd resistor are connected with the other end of the second resistance, the 3rd resistor it is another End is connected with the collector of first triode；
The base stage of second triode, second triode is connected with the other end of the first resistor, second triode Emitter be connected with the emitter of first triode, the grounded collector of second triode；
One end of 4th resistance, the 4th resistance is connected with the emitter of first triode, the 4th resistance it is another One end is connected with the driving end of first power switch tube；
One end of 5th resistance, the 5th resistance is connected with the other end of the 4th resistance, the 5th resistance it is another End ground connection.
9. the control device of power switch tube in electromagnetism cooking pot according to claim 8, which is characterized in that described second Driving circuit includes:
6th resistance, input terminal of the one end of the 6th resistance as second driving signal；
Third transistor, the base stage of the third transistor are connected with the other end of the 6th resistance；
One end of 7th resistance, the 7th resistance is connected with the other end of the 6th resistance, the 7th resistance it is another End is connected to default power supply；
One end of 8th resistance, the 8th resistance is connected with the other end of the 7th resistance, the 8th resistance it is another End is connected with the collector of the third transistor；
The base stage of 4th triode, the 4th triode is connected with the other end of the 6th resistance, the 4th triode Emitter be connected with the emitter of the third transistor, the grounded collector of the 4th triode；
One end of 9th resistance, the 9th resistance is connected with the emitter of the third transistor, the 9th resistance it is another One end is connected with the driving end of second power switch tube；
One end of tenth resistance, the tenth resistance is connected with the other end of the 9th resistance, the tenth resistance it is another End ground connection.
10. a kind of electromagnetism cooking pot, which is characterized in that including electromagnetism cooking pot according to claim 1 to 9 The control device of middle power switch tube.
11. the control method of power switch tube in a kind of electromagnetism cooking pot, which is characterized in that the electromagnetism cooking pot includes mutual The first power switch tube and the second power switch tube in parallel, the control method the following steps are included:
Input inceptive impulse signal；
The inceptive impulse signal is handled to obtain the first driving signal and the second driving signal, and passes through described first Driving signal carries out drive control and by second driving signal to second power to first power switch tube Switching tube carries out drive control, is connected and closes in turn to control first power switch tube and second power switch tube It is disconnected.
CN201711229326.1A 2017-11-29 2017-11-29 Electromagnetic cooker and control device and method of power switch tube of electromagnetic cooker Active CN109842308B (en)

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