CN108668392A - The Drive Protecting Circuit and method of electromagnetic heating apparatus and its power switch tube - Google Patents
The Drive Protecting Circuit and method of electromagnetic heating apparatus and its power switch tube Download PDFInfo
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- CN108668392A CN108668392A CN201710195944.2A CN201710195944A CN108668392A CN 108668392 A CN108668392 A CN 108668392A CN 201710195944 A CN201710195944 A CN 201710195944A CN 108668392 A CN108668392 A CN 108668392A
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- power switch
- switch tube
- drive module
- electromagnetic heating
- heating apparatus
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 83
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
Abstract
Drive Protecting Circuit the invention discloses power switch tube in a kind of electromagnetic heating apparatus includes：Drive module, drive module are connected with the control pole of power switch tube, and drive module is used for driving power switching tube；Chip is controlled, control chip is connected with drive module, and control chip is for outputing control signals to drive module；Locking module, locking module is connected with drive module, locking module is used to export locking signal when electromagnetic heating apparatus powers on to drive module, so that drive module driving power switching tube turns off, and unlocking signal is exported after the preset lime to drive module, so that drive module is switched on or off according to control signal driving power switching tube, and it is logical to prevent power switch tube from opening by mistake in powered on moment, improve the stability of power switch tube.The invention also discloses the driving guard methods of a kind of electromagnetic heating apparatus and its power switch tube.
Description
Technical field
The present invention relates to living electric apparatus technical field, more particularly to a kind of electromagnetic heating apparatus, a kind of electromagnetic heating apparatus
The driving guard method of power switch tube in the Drive Protecting Circuit of middle power switch tube and a kind of electromagnetic heating apparatus.
Background technology
In relevant electromagnetic heating apparatus, usually by controlling chip output control signal with driving power switching tube example
Such as IGBT.But the relevant technologies the problem is that, in powered on moment, control chip plays pendulum, in fact it could happen that accidentally
Phenomenon is exported, and then it is logical that IGBT may be caused to open by mistake, and burns out the core devices IGBT of electromagnetic oven.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
First purpose is to propose a kind of Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus, prevents power switch tube from existing
Powered on moment opens by mistake logical, improves the stability of power switch tube.
Second object of the present invention is to propose a kind of electromagnetic heating apparatus.Third object of the present invention is to propose
The driving guard method of power switch tube in a kind of electromagnetic heating apparatus.
In order to achieve the above objectives, first aspect present invention embodiment proposes power switch tube in a kind of electromagnetic heating apparatus
Drive Protecting Circuit, including：Drive module, the drive module are connected with the control pole of the power switch tube, the drive
Dynamic model block is for driving the power switch tube；Chip is controlled, the control chip is connected with the drive module, the control
Chip is for outputing control signals to the drive module；Locking module, the locking module are connected with the drive module, institute
Locking module is stated for exporting locking signal when the electromagnetic heating apparatus powers on to the drive module, so that the driving
Power switch tube described in module drive turns off, and after the preset time exports unlocking signal to the drive module, with
The drive module is set to drive the power switch tube to be switched on or off according to the control signal.
The Drive Protecting Circuit of power switch tube in the electromagnetic heating apparatus proposed according to embodiments of the present invention, can pass through
Locking module exports locking signal when electromagnetic heating apparatus powers on to drive module, so that drive module driving power switching tube
Shutdown, and output unlocking signal is to drive module after the preset lime, so that drive module is believed according to the control of control chip
Number driving power pipe that opens the light is switched on or off, to make the power when electromagnetic heating apparatus powers on by the setting of locking module
Switching tube is held off, and is prevented power switch tube from being opened by mistake in powered on moment logical, is improved the stability of power switch tube.Also,
The circuit realizes that simple, reliability is high and cost is few.
In addition, the Drive Protecting Circuit of power switch tube may be used also in electromagnetic heating apparatus according to the above embodiment of the present invention
To have following additional technical characteristic：
According to one embodiment of present invention, the locking module includes：Partial pressure unit, the input terminal of the partial pressure unit
It is connected with default power supply, the partial pressure unit is used to divide to export with reference to electricity the predeterminated voltage of the default power supply
Pressure；Discharge cell, the input terminal of the discharge cell are connected with the default power supply, and the discharge cell is used in the electromagnetism
It is discharged when heating equipment powers on so that the output voltage of the discharge cell continuously decreases；Comparing unit, it is described relatively more single
The first input end of member is connected with the output end of the partial pressure unit, and the second input terminal of the comparing unit is single with the electric discharge
The output end of member is connected, and the output end of the comparing unit is connected with the drive module, and the comparing unit is used for described
The output voltage of discharge cell exports the locking signal when being more than the reference voltage, and in the output of discharge cell electricity
Pressure exports the unlocking signal when being less than the reference voltage.
According to one embodiment of present invention, the discharge cell includes concatenated first capacitance and first resistor, described
One end of first capacitance is connected with the default power supply, and one end of the first resistor is connected with the other end of first capacitance
And there is first node, the other end of the first resistor is grounded, the second input of the first node and the comparing unit
End is connected.
According to one embodiment of present invention, capacitance and the first resistor of the preset time with first capacitance
Resistance value it is related.
According to one embodiment of present invention, the partial pressure unit includes concatenated second resistance and 3rd resistor, described
One end of second resistance is connected with the default power supply, and one end of the 3rd resistor is connected with the other end of the second resistance
And there is second node, the other end of the 3rd resistor is grounded, the first input of the second node and the comparing unit
End is connected.
According to one embodiment of present invention, the comparing unit includes comparator, the positive input terminal of the comparator with
The partial pressure unit is connected, and the negative input end of the comparator is connected with the output end of the discharge cell, the comparator
Output end is connected with the drive module.
According to one embodiment of present invention, the drive module includes：4th resistance, one end of the 4th resistance with
The control chip is connected；One end of 5th resistance, the 5th resistance is connected and has with the other end of the 4th resistance
Third node, the other end ground connection of the 5th resistance；First triode, the base stage of first triode and the third section
Point is connected, and the collector of first triode is connected by the 6th resistance with default power supply, the transmitting of first triode
Pole is grounded；Second triode, the base stage of second triode are connected with the collector of second triode, and the described 2nd 3
The collector of pole pipe is connected by the 7th resistance with the default power supply, the emitter ground connection of second triode；Three or three
Pole pipe, the collector of the third transistor are connected with the default power supply；4th triode, the base stage of the 4th triode
It is connected with the base stage of the third transistor and there is fourth node, the emitter of the 4th triode to be grounded, the described 4th
Node is connected with the collector of second triode；8th resistance, one end and the third transistor of the 8th resistance
Emitter be connected, the other end of the 8th resistance is connected with the collector of the 4th triode, wherein the power is opened
The control pole for closing pipe is connected with the other end of the collector of the 4th triode and the 8th resistance respectively.
Wherein, first triode, second triode and the third transistor are NPN type triode, institute
It is PNP type triode to state the 4th triode.
According to one embodiment of present invention, the locking module is connected with the fourth node.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of electromagnetic heating apparatus, and described includes institute
The Drive Protecting Circuit of power switch tube in the electromagnetic heating apparatus stated.
The electromagnetic heating apparatus proposed according to embodiments of the present invention can be in electromagnetic heating apparatus by Drive Protecting Circuit
Power switch tube is held off when powering on, and is prevented power switch tube from being opened by mistake in powered on moment logical, is improved the steady of power switch tube
It is qualitative.
According to one embodiment of present invention, the electromagnetic heating apparatus can be electromagnetic oven, electromagnetic stove, electromagnetic rice cooker
Or prevention electromagnetic pressure cooker.
In order to achieve the above objectives, third aspect present invention embodiment proposes power switch tube in a kind of electromagnetic heating apparatus
Driving guard method, include the following steps：When the electromagnetic heating apparatus powers on, locking signal is exported by locking module
To the drive module of the electromagnetic heating apparatus, so that the drive module drives the power switch tube shutdown；Described pre-
If after the time, unlocking signal is exported to the drive module, so that the drive module is according to control by the locking module
The control signal of coremaking piece output drives the power switch tube to be switched on or off.
The driving guard method of power switch tube in the electromagnetic heating apparatus proposed according to embodiments of the present invention, first in electricity
When magnetic heating equipment powers on, locking signal is exported to the drive module of electromagnetic heating apparatus, so that driving mould by locking module
Block driving power switching tube turns off, and then after the preset lime, unlocking signal is exported to drive module by locking module, with
Drive module is set to be switched on or off according to the control signal driving power switching tube of control chip output, to pass through locking module
Setting so that power switch tube is held off when electromagnetic heating apparatus powers on, and prevents power switch tube from being opened by mistake in powered on moment
It is logical, improve the stability of power switch tube.
Description of the drawings
Fig. 1 is that the box of the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to the ... of the embodiment of the present invention shows
It is intended to；
Fig. 2 is the side of the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to an embodiment of the invention
Frame schematic diagram；
Fig. 3 is the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus accord to a specific embodiment of that present invention
Circuit diagram；
Fig. 4 is the work of the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to an embodiment of the invention
Make principle schematic；
Fig. 5 is the block diagram of electromagnetic heating apparatus according to the ... of the embodiment of the present invention；And
Fig. 6 is the flow of the driving guard method of power switch tube in electromagnetic heating apparatus according to the ... of the embodiment of the present invention
Figure.
Specific implementation mode
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 for explaining the present invention, and is not considered as limiting the invention.
It is protected below in conjunction with the accompanying drawings to describe the electromagnetic heating apparatus of the embodiment of the present invention and its driving of power switch tube
Circuit and method.
Fig. 1 is that the box of the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to the ... of the embodiment of the present invention shows
It is intended to.As shown in Figure 1, the Drive Protecting Circuit 100 of power switch tube includes：Drive module 10, control chip 20 and locking mould
Block 30.
Wherein, drive module 10 is connected with the control pole G of such as IGBT of power switch tube 40, and drive module 10 is for driving
Power switch tube 40；Control chip 20 is connected with drive module 10, and control chip 20 is for outputing control signals to drive module
10；Locking module 30 is connected with drive module 10, and locking module 30 is used to export locking signal when electromagnetic heating apparatus powers on
To drive module 10, so that 10 driving power switching tube 40 of drive module turns off, and unlocking signal is exported after the preset lime
To drive module 10, so that drive module 10 is switched on or off according to control signal driving power switching tube 40.
That is, in electromagnetic heating apparatus powered on moment, the voltage instantaneous of drive module 10 rises to default electricity by 0V
The voltage VCC in source, for the locking signal of the output of locking module 30 at this time to drive module 10, locking signal can be such that drive module 10 shields
Control the control signal that chip 20 exports, i.e., the control signal driving power that drive module 10 can not be exported according to control chip 20
Switching tube 40 is switched on or off, and power switch tube 40 is constantly in off state.
After the preset lime, locking module 30 exports unlocking signal to drive module 10, and drive module 10 receives unlock
Signal, locking signal, which no longer shields, at this time controls the control signal that chip 20 exports, i.e., drive module 10 can be according to control chip
The control signal driving power switching tube 40 of 20 outputs is switched on or off, that is to say, that control chip 20 is output control signals to
Drive module 10, drive module 10 are switched on or off according to control signal driving power switching tube 40.
As a result, in electromagnetic heating apparatus powered on moment, power switch tube 40 is off state, effectively prevent power switch
Pipe 40 is logical in opening by mistake for powered on moment, after the preset lime, when control chip 20 is in stable state, then to power switch tube
40 are driven, and damage power switch tube is avoided.
According to one embodiment of present invention, as shown in Fig. 2, locking module 30 includes：Partial pressure unit 50, discharge cell
60 and comparing unit 70.
Wherein, the input terminal of partial pressure unit 50 is connected with default power supply VCC, and partial pressure unit 50 is used for presetting power supply VCC
Predeterminated voltage divided with output reference voltage；The input terminal of discharge cell 60 is connected with default power supply VCC, discharge cell
60 when electromagnetic heating apparatus powers on for being discharged so that the output voltage of discharge cell 60 continuously decreases；Comparing unit 70
First input end be connected with the output end of partial pressure unit 50, the output of the second input terminal and discharge cell 60 of comparing unit 70
End is connected, and the output end of comparing unit 70 is connected with drive module 10, and comparing unit 70 is used for the output electricity in discharge cell 60
Pressure exports locking signal, and the output unlock letter when the output voltage of discharge cell 60 is less than reference voltage when being more than reference voltage
Number.
A specific embodiment according to the present invention, as shown in figure 3, partial pressure unit 50 include concatenated second resistance R2 and
3rd resistor R3, one end of second resistance R2 are connected with default power supply VCC, and one end of 3rd resistor R3 is another with second resistance R2's
One end is connected and there is second node A2, the other end of 3rd resistor R3 to be grounded, and the first of second node A2 institutes comparing unit 70
Input terminal is connected.
Specifically, the second resistance R2 in partial pressure unit 50 and 3rd resistor R3 series connection, with to presetting the pre- of power supply VCC
If voltage is divided, and the voltage drop value at the voltage after partial pressure, that is, both ends second resistance R2 is provided to the first of comparing unit 70
Input terminal.
For example, second resistance R2 can be identical with the resistance value of 3rd resistor R3, for example, 10K Ω, then is provided to
The voltage of the first input end of comparing unit 70 is the 1/2 of the predeterminated voltage of default power supply VCC.
According to one embodiment of present invention, as shown in figure 3, discharge cell 60 includes concatenated first capacitance C1 and first
Resistance R1, one end of the first capacitance C1 are connected with default power supply VCC, the other end of one end of first resistor R1 and the first capacitance C1
It is connected and there is first node A1, the other end ground connection of first resistor R1, the second input of first node A1 and comparing unit 70
End is connected.
Specifically, in electromagnetic heating system powered on moment, the voltage of default power supply rises to VCC, discharge cell by 0V
The voltage at the first both ends capacitance C1 in 60 cannot be mutated, and the voltage drop value at the both ends C1 rapidly rises to the voltage of default power supply VCC
Value, therewith, the first capacitance C1 is discharged by the first resistor R1 being attached thereto, and one end of first resistor R1 and first
The other end of capacitance C1 is connected and there is first node A1, first node A1 to be connected with the second input terminal of comparing unit 70, then
The input voltage of second input terminal of comparing unit 70 is the voltage drop value at default VCC pairs of the first both ends capacitance C1 of power supply, due to the
One capacitance C1 is gradually discharged by R1 after fully charging, therefore, the input voltage of the second input terminal of comparing unit 70 be by
Gradually reduce.
According to one embodiment of present invention, as shown in figure 3, comparing unit 70 includes comparator 80, comparator 80 is just
Input terminal is connected with partial pressure unit 50, and the negative input end of comparator 80 is connected with the output end of discharge cell 60, comparator 80
Output end is connected with drive module 10.
Specifically, the input voltage of the positive input terminal of comparator 80 is the reference voltage that partial pressure unit 50 exports, i.e., the
The voltage drop value (for fixed value) at two both ends resistance R2, the input voltage of the negative input end of comparator 80 is the defeated of discharge cell 60
Go out voltage, i.e. the voltage drop value of the first both ends capacitance C1 variation, and in electromagnetic heating system powered on moment, the negative input of comparator 80
The input voltage at end is the voltage that the voltage drop value at the first both ends capacitance C1 is default power supply VCC, at this point, comparator 80 is negative defeated
Enter end input voltage (voltage drop values at the first both ends capacitance C1) be more than positive input terminal input voltage (both ends second resistance R2
Voltage drop value), comparator 80 exports low level signal, that is, locking signal, and drive module 10 controls under the action of locking signal at this time
Power switch tube 40 is off state.
With the electric discharge of discharge cell 60, the voltage drop value at the first both ends capacitance C1 continuously decreases, after the preset lime, than
Compared with the input voltage (second that the input voltage (voltage drop values at the first both ends capacitance C1) of the negative input end of device 80 is less than positive input terminal
The voltage drop value at the both ends resistance R2), overturning i.e. output unlocking signal occurs for the output of comparator 80, and drive module 10 is believed in unlock at this time
It is switched on or off according to control signal control power switch tube 40 under the action of number.Wherein, the voltage at the first both ends capacitance C1
Change curve as shown in the curve a in Fig. 4, can preset the voltage of power supply VCC change curve can as shown in the curve b in Fig. 4,
The change curve of the output level of comparator 80 can be as shown in the curve c in Fig. 4.
Wherein, according to one embodiment of present invention, the capacitance of preset time and the first capacitance C1 and first resistor R1
Resistance value is related.
Specifically, the calculation formula of preset time t can be：T=R*C*ln [(V1-V0)/(V1-Vt)], wherein V1
The initial voltage value of one capacitance C1, V0 be the first capacitance C1 it is final can discharge voltage value, Vt be the first capacitance C1 in t moment
Discharge voltage value, C are the capacitance of the first capacitance C1, and R is the resistance value of first resistor R1, and when C is 0.1uF, R 500K
The resistance value of Ω, R2, R3 it is identical and for 10K Ω when, the value of preset time t is 35ms.That is, on electromagnetic heating apparatus
After electric 35ms, drive module 10 controls opening and closing for power switch tube 40 according to the control signal that control chip 20 exports
Disconnected, to avoid powered on moment, power switch tube opens by mistake logical, is damaged to power switch tube.
According to one embodiment of present invention, as shown in figure 3, drive module 10 includes：4th resistance R4, the 5th resistance
R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the first triode Q1, the second triode Q2, third transistor Q3 and
4th triode Q4.
Wherein, one end of the 4th resistance R4 is connected with control chip 30；One end of 5th resistance R5 is with the 4th resistance R4's
The other end is connected and there is the other end of third node A3, the 5th resistance R5 to be grounded；The base stage of first triode Q1 and third section
Point A3 is connected, and the collector of the first triode Q1 is connected by the 6th resistance R6 with default power supply VCC, the hair of the first triode Q1
Emitter grounding；The base stage of second triode Q2 is connected with the collector of the second triode Q2, and the collector of the second triode Q2 is logical
It crosses the 7th resistance R7 with default power supply VCC to be connected, the emitter ground connection of the second triode Q2；The collector of third transistor Q3 with
Default power supply VCC is connected；The base stage of 4th triode Q4 is connected with the base stage of third transistor Q3 and has fourth node A4, the
The emitter of four triode Q4 is grounded, and fourth node A4 is connected with the collector of the second triode Q2；One end of 8th resistance R8
It is connected with the emitter of third transistor Q3, the other end of the 8th resistance R8 is connected with the collector of the 4th triode Q4, wherein
The control pole G of power switch tube 40 is connected with the other end of the collector of the 4th triode Q4 and the 8th resistance R8 respectively.
Wherein, the first triode Q1, the second triode Q2 and third transistor Q3 are NPN type triode, the four or three pole
Pipe Q4 is PNP type triode.
According to one embodiment of present invention, locking module 30 is connected with fourth node A4.It should be understood that locking mould
Block 30 can neatly be connected with drive module 10, be not limited at fourth node A4, can only realize shielding control signal
Effect.
Specifically, as shown in Figure 3 and Figure 4, in electromagnetic heating apparatus the Drive Protecting Circuit of power switch tube work
Principle is as follows：In electromagnetic heating apparatus powered on moment, the voltage of power supply VCC (i.e. the supply voltage of drive module 10) is preset by 0
VCC is risen to, and is charged to the first capacitance C1, since the voltage at the first both ends capacitance C1 can not mutate, so the
The voltage drop value at one both ends capacitance C1 rises to the voltage of default power supply VCC with default power supply VCC, at this point, the negative sense of comparator 80
The input voltage at end is higher than the input voltage of forward end, and comparator 80 exports low level, and third transistor Q3 is in cut-off state,
And then 10 driving power of drive module open the light pipe 40 shutdown, later, discharged by R1 couples of the first capacitance C1 of first resistor,
After preset time such as 35ms, the voltage drop value at the first both ends capacitance C1 deteriorates to less than the voltage drop value at the both ends second resistance R2,
The input voltage of the negative end of comparator 80 is less than the input voltage of forward end, and the output end of comparator 80 is overturn, by low
Level becomes high-impedance state, at this point, third transistor Q3 is no longer by the control of comparator 80, and then drive module 10 is according to control
The square-wave signal that chip 20 exports controls power switch tube 40, so that drive of the power switch tube 40 in square-wave pulse signal
It is switched on or off under dynamic.
In addition, as shown in figure 3, the power end of comparator 80 is connected with default power supply VCC, the ground terminal of comparator 80 with connect
Ground.It should be noted that the power end of comparator 80 can also be connected with other power supplys, i.e., comparator 80 can be adopted with drive module 10
With identical power supply, different power supplys can also be used, such as default power supply VCC is 18V, drive module 10 is powered using 18V, than
18V power supplies may be used compared with device 80,5V power supplies can also be used.
In conclusion the driving protection of power switch tube is electric in the electromagnetic heating apparatus proposed according to embodiments of the present invention
Road can export locking signal to drive module, so that drive module is driven by locking module when electromagnetic heating apparatus powers on
Dynamic power switch tube shutdown, and output unlocking signal is to drive module after the preset lime, so that drive module is according to control
The control signal driving power of the chip pipe that opens the light is switched on or off, to set in electromagnetic heating by the setting of locking module
It is held off for power switch tube when powering on, prevents power switch tube from being opened by mistake in powered on moment logical, improve power switch tube
Stability.Also, the circuit realizes that simple, reliability is high and cost is few.
Fig. 5 is the block diagram of electromagnetic heating apparatus according to the ... of the embodiment of the present invention.As shown in figure 5, the electromagnetic heating
Equipment 200 includes the Drive Protecting Circuit 100 of power switch tube in electromagnetic heating apparatus.
According to one embodiment of present invention, electromagnetic heating apparatus 200 can be electromagnetic oven, electromagnetic stove, electromagnetic rice cooker
Or prevention electromagnetic pressure cooker.
In conclusion the electromagnetic heating apparatus proposed according to embodiments of the present invention can be in electromagnetism by Drive Protecting Circuit
Power switch tube is held off when heating equipment powers on, and is prevented power switch tube from being opened by mistake in powered on moment logical, is improved power and open
Close the stability of pipe.
Fig. 6 is the flow of the driving guard method of power switch tube in electromagnetic heating apparatus according to the ... of the embodiment of the present invention
Figure.As shown in fig. 6, this approach includes the following steps：
S101：When electromagnetic heating apparatus powers on, drive of the locking signal to electromagnetic heating apparatus is exported by locking module
Dynamic model block, so that drive module driving power switching tube turns off.
That is, in electromagnetic heating apparatus powered on moment, the voltage instantaneous of drive module rises to default power supply by 0V
Voltage VCC, for the locking signal of locking module output at this time to drive module, locking signal can make drive module shielding control chip defeated
The control signal gone out, i.e. drive module can not opening or closing according to the control signal driving power switching tube of control chip output
Disconnected, power switch tube is constantly in off state.
S102：After the preset lime, unlocking signal is exported to drive module, so that drive module root by locking module
It is switched on or off according to the control signal driving power switching tube of control chip output.
That is, after the preset lime, locking module exports unlocking signal to drive module, and drive module receives solution
Lock signal, locking signal, which no longer shields, at this time controls the control signal that chip exports, i.e., drive module can be defeated according to control chip
The control signal driving power switching tube gone out is switched on or off, that is to say, that and control chip outputs control signals to drive module,
Drive module is switched on or off according to control signal driving power switching tube.
As a result, in electromagnetic heating apparatus powered on moment, power switch tube is off state, effectively prevent power switch tube
It is logical in opening by mistake for powered on moment, after the preset lime, when control chip is in stable state, then power switch tube is driven
It is dynamic, avoid damage power switch tube.
In conclusion in the electromagnetic heating apparatus proposed according to embodiments of the present invention power switch tube driving protection side
Method, first when electromagnetic heating apparatus powers on, by locking module export locking signal to electromagnetic heating apparatus drive module,
So that drive module driving power switching tube turns off, then after the preset lime, unlocking signal is exported extremely by locking module
Drive module, so that drive module is switched on or off according to the control signal driving power switching tube that control chip exports, to
So that power switch tube is held off when electromagnetic heating apparatus powers on, and prevents power switch tube from existing by the setting of locking module
Powered on moment opens by mistake logical, improves the stability of power switch tube.
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 ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply 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 at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., 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；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct 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
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is 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 embodiments or example.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, changes, replacing and modification.
Claims (11)
1. the Drive Protecting Circuit of power switch tube in a kind of electromagnetic heating apparatus, which is characterized in that including：
Drive module, the drive module are connected with the control pole of the power switch tube, and the drive module is for driving institute
State power switch tube；
Chip is controlled, the control chip is connected with the drive module, and the control chip is for outputing control signals to institute
State drive module；
Locking module, the locking module are connected with the drive module, and the locking module in the electromagnetic heating for setting
For output locking signal when powering on to the drive module, so that the drive module drives the power switch tube shutdown, and
Unlocking signal is exported after the preset time to the drive module, so that the drive module is according to the control signal
The power switch tube is driven to be switched on or off.
2. the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to claim 1, which is characterized in that institute
Stating locking module includes：
Partial pressure unit, the input terminal of the partial pressure unit are connected with default power supply, and the partial pressure unit is used for the default electricity
The predeterminated voltage in source is divided with output reference voltage；
Discharge cell, the input terminal of the discharge cell are connected with the default power supply, and the discharge cell is used in the electricity
Magnetic heating equipment is discharged when powering on so that the output voltage of the discharge cell continuously decreases；
Comparing unit, the first input end of the comparing unit are connected with the output end of the partial pressure unit, the comparing unit
The second input terminal be connected with the output end of the discharge cell, the output end of the comparing unit and the drive module phase
Even, the comparing unit is used to export the locking letter when the output voltage of the discharge cell is more than the reference voltage
Number, and export the unlocking signal when the output voltage of the discharge cell is less than the reference voltage.
3. the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to claim 2, which is characterized in that institute
It includes concatenated first capacitance and first resistor to state discharge cell, and one end of first capacitance is connected with the default power supply,
One end of the first resistor is connected with the other end of first capacitance and has a first node, the first resistor it is another
End ground connection, the first node are connected with the second input terminal of the comparing unit.
4. the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to claim 3, which is characterized in that institute
It is related to the capacitance of first capacitance and the resistance value of the first resistor to state preset time.
5. the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to claim 2, which is characterized in that institute
It includes concatenated second resistance and 3rd resistor to state partial pressure unit, and one end of the second resistance is connected with the default power supply,
One end of the 3rd resistor is connected with the other end of the second resistance and has a second node, the 3rd resistor it is another
End ground connection, the second node are connected with the first input end of the comparing unit.
6. the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to claim 2, which is characterized in that institute
It includes comparator to state comparing unit, and the positive input terminal of the comparator is connected with the partial pressure unit, and bearing for the comparator is defeated
Enter end with the output end of the discharge cell to be connected, the output end of the comparator is connected with the drive module.
7. the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to claim 1, which is characterized in that institute
Stating drive module includes：
4th resistance, one end of the 4th resistance are connected with the control chip；
One end of 5th resistance, the 5th resistance is connected with the other end of the 4th resistance and has third node, described
The other end of 5th resistance is grounded；
First triode, the base stage of first triode are connected with the third node, the collector of first triode
It is connected with default power supply by the 6th resistance, the emitter ground connection of first triode；
Second triode, the base stage of second triode are connected with the collector of second triode, the two or three pole
The collector of pipe is connected by the 7th resistance with the default power supply, the emitter ground connection of second triode；
Third transistor, the collector of the third transistor are connected with the default power supply；
The base stage of 4th triode, the 4th triode is connected with the base stage of the third transistor and has a fourth node,
The emitter of 4th triode is grounded, and the fourth node is connected with the collector of second triode；
One end of 8th resistance, the 8th resistance is connected with the emitter of the third transistor, the 8th resistance it is another
One end is connected with the collector of the 4th triode, wherein the control pole of the power switch tube is respectively with the described 4th 3
The collector of pole pipe is connected with the other end of the 8th resistance.
8. the Drive Protecting Circuit of power switch tube in electromagnetic heating apparatus according to claim 7, which is characterized in that institute
Locking module is stated with the fourth node to be connected.
9. a kind of electromagnetic heating apparatus, which is characterized in that include that electromagnetic heating according to any one of claim 1-8 is set
The Drive Protecting Circuit of standby middle power switch tube.
10. electromagnetic heating apparatus according to claim 9, which is characterized in that the electromagnetic heating apparatus is electromagnetic oven, electricity
Magnetic stove, electromagnetic rice cooker or prevention electromagnetic pressure cooker.
11. the driving guard method of power switch tube in a kind of electromagnetic heating apparatus, which is characterized in that include the following steps：
When the electromagnetic heating apparatus powers on, driving of the locking signal to the electromagnetic heating apparatus is exported by locking module
Module, so that the drive module drives the power switch tube shutdown；
After the preset time, unlocking signal is exported to the drive module, so that the drive by the locking module
Dynamic model root tuber drives the power switch tube to be switched on or off according to the control signal of control chip output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710195944.2A CN108668392A (en) | 2017-03-29 | 2017-03-29 | The Drive Protecting Circuit and method of electromagnetic heating apparatus and its power switch tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710195944.2A CN108668392A (en) | 2017-03-29 | 2017-03-29 | The Drive Protecting Circuit and method of electromagnetic heating apparatus and its power switch tube |
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| CN108668392A true CN108668392A (en) | 2018-10-16 |
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| CN201710195944.2A Pending CN108668392A (en) | 2017-03-29 | 2017-03-29 | The Drive Protecting Circuit and method of electromagnetic heating apparatus and its power switch tube |
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| CN111076629A (en) * | 2020-01-17 | 2020-04-28 | 杭州晋旗电子科技有限公司 | Discharge control circuit and electronic detonator |
| CN114336269A (en) * | 2020-09-29 | 2022-04-12 | 深圳市帝迈生物技术有限公司 | Drive circuit and laser device |
| CN114641099A (en) * | 2022-03-09 | 2022-06-17 | 广东精装照明有限公司 | Electric ceramic stove integrated circuit and electric ceramic stove |
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