CN108809283A - The Drive Protecting Circuit of electromagnetic heating system and its IGBT - Google Patents
The Drive Protecting Circuit of electromagnetic heating system and its IGBT Download PDFInfo
- Publication number
- CN108809283A CN108809283A CN201710302264.6A CN201710302264A CN108809283A CN 108809283 A CN108809283 A CN 108809283A CN 201710302264 A CN201710302264 A CN 201710302264A CN 108809283 A CN108809283 A CN 108809283A
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- China
- Prior art keywords
- igbt
- temperature
- heating system
- electromagnetic heating
- signal
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K2017/0806—Modifications for protecting switching circuit against overcurrent or overvoltage against excessive temperature
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- Power Conversion In General (AREA)
Abstract
The invention discloses the Drive Protecting Circuits of a kind of electromagnetic heating system and its IGBT, wherein Drive Protecting Circuit includes：Main control chip, the main control chip is for exporting control signal；Driving chip, the driving chip is connected with the main control chip and the IGBT respectively, the driving chip is built-in with temperature detecting unit, trigger element and driving unit, the driving unit is used to generate drive pulse signal according to the control signal, to drive the IGBT to be switched on or off, the temperature detecting unit detects signal to the trigger element by detecting the temperature of the IGBT with output temperature, the trigger element exports trigger signal to the driving unit when judging that the temperature of the IGBT is more than preset temperature according to the temperature detection signal, so that the driving unit drives the IGBT shutdowns, it is sampled without temperature AD, the overheat protector of IGBT can be realized in time, substantially reduce the probability that IGBT excess temperatures are burnt.
Description
Technical field
The present invention relates to living electric apparatus technical field, more particularly to IGBT (Insulated in a kind of electromagnetic heating system
GateBipolar Transistor, insulated gate bipolar transistor) Drive Protecting Circuit and a kind of there is the driving to protect
The electromagnetic heating system of protection circuit.
Background technology
The electromagnetic heating system such as electromagnetic oven of usual list IGBT, opening or closing for IGBT is driven using driving chip
It is disconnected, and be that PPG pulses are exported to driving chip by main control chip, corresponding IGBT driving pulses are exported extremely by driving chip
IGBT。
And the temperature acquisition of general IGBT is then realized and (is measured indirectly) by being tightly attached to the thermistor beside IGBT.Wherein,
Under some specific environment (wind turbine stall or air inlet block) easily there is high temperature in IGBT, and main control chip is to pass through temperature
AD samplings export PPG pulses to detect the temperature of IGBT, and in the stopping when the temperature is excessively high for detecting IGBT, to stop
IGBT drives, and is simultaneously emitted by warning message, realizes IGBT overheat protectors.However, since temperature AD is sampled there are certain hysteresis quality,
It easily causes protection not in time, burns phenomenon to will appear IGBT.
Invention content
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, the present invention
One purpose is to propose that the Drive Protecting Circuit of IGBT in electromagnetic heating system a kind of can be timely without temperature AD samplings
The overheat protector for realizing IGBT, substantially reduces the probability that IGBT excess temperatures are burnt.
It is another object of the present invention to propose a kind of electromagnetic heating system.
In order to achieve the above objectives, the driving protection electricity of IGBT in a kind of electromagnetic heating system that the embodiment of the present invention proposes
Road, including：Main control chip, the main control chip is for exporting control signal；Driving chip, the driving chip respectively with it is described
Main control chip is connected with the IGBT, and the driving chip is built-in with temperature detecting unit, trigger element and driving unit, described
Driving unit is used to generate drive pulse signal, to drive the IGBT to be switched on or off, the temperature according to the control signal
It spends detection unit and signal is detected to the trigger element, the trigger element with output temperature by detecting the temperature of the IGBT
Output trigger signal is single to the driving when judging that the temperature of the IGBT is more than preset temperature according to the temperature detection signal
Member, so that the driving unit drives the IGBT shutdowns.
The Drive Protecting Circuit of IGBT in electromagnetic heating system according to the ... of the embodiment of the present invention, the built-in temperature in driving chip
Detection unit, trigger element and driving unit are spent, detects the temperature of IGBT, and trigger element by temperature detecting unit in this way
Trigger signal can be exported when the temperature of IGBT is more than preset temperature to driving unit, so that driving unit driving IGBT is closed
It is disconnected, to realize the overheat protector of IGBT in time.The Drive Protecting Circuit of the IGBT of the embodiment of the present invention as a result, is not necessarily to temperature
AD is sampled, and can be realized the excess temperature automatic protection of IGBT in time, be substantially reduced the probability that IGBT excess temperatures are burnt, and is improved reliable
Property, ensure electromagnetic heating system safe and reliable operation.
According to one embodiment of present invention, the temperature detecting unit includes：Temperature sampling thermistor, the temperature
Sample one end ground connection of thermistor；First resistor, one end of the first resistor are another with the temperature sampling thermistor
One end is connected and there is first node, the other end of the first resistor to be connected with default power supply, and the first node is as institute
State the output end of temperature detecting unit.
Wherein, the temperature sampling thermistor is negative tempperature coefficient thermistor.
According to one embodiment of present invention, the trigger element includes：Comparator, the positive input terminal of the comparator with
The first node is connected, and negative input end and the reference voltage of the comparator provide end and be connected, and the comparator is according to
Reference voltage provides the reference voltage signal that end provides and is compared to the temperature detection signal to judge the temperature of the IGBT
Whether degree is more than preset temperature, and low level comparison signal is exported when the temperature of the IGBT is more than preset temperature；With door electricity
Road, the first input end of the AND gate circuit are connected with the output end of the comparator, the second input terminal of the AND gate circuit
It is connected with the output end of the main control chip, the output end of the AND gate circuit is connected with the input terminal of the driving unit, institute
It states AND gate circuit and low level trigger signal is exported to the driving unit according to the low level comparison signal.
Also, the trigger element further includes pull-up resistor, the output of one end of the pull-up resistor and the comparator
End is connected, and the other end of the pull-up resistor is connected with the default power supply.
According to one embodiment of present invention, the first node is also connected with the AD sampling ends of the main control chip, institute
Main control chip is stated also to sample the temperature detection signal by the AD sampling ends to obtain the temperature of the IGBT, and
Stop exporting the control signal when the temperature of the IGBT is more than preset temperature, with by described in driving unit driving
IGBT is turned off.
According to one embodiment of present invention, the IGBT is arranged at the electromagnetic heating system with the driving chip
Electric-controlled plate on, and the poles E of the IGBT are connect with the reference ground of the driving chip.
Specifically, the distance between the poles E of the IGBT and the reference ground of the driving chip are less than 20mm.
In addition, the embodiment of the present invention also proposed a kind of electromagnetic heating system comprising in above-mentioned electromagnetic heating system
The Drive Protecting Circuit of IGBT.
The electromagnetic heating system of the embodiment of the present invention is adopted by the Drive Protecting Circuit of above-mentioned IGBT without temperature AD
Sample can realize the excess temperature automatic protection of IGBT in time, substantially reduce the probability that IGBT excess temperatures are burnt, improve reliability.
Description of the drawings
Fig. 1 is the schematic diagram of the Drive Protecting Circuit of IGBT in electromagnetic heating system according to an embodiment of the invention；
Fig. 2 is the signal of the Drive Protecting Circuit of IGBT in electromagnetic heating system in accordance with another 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 with reference to the accompanying drawings to describe the driving of IGBT in the electromagnetic heating system proposed according to embodiments of the present invention
Circuit and electromagnetic heating system with the Drive Protecting Circuit.
In an embodiment of the present invention, electromagnetic heating system can be the electricity such as electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker
Magnetic heats product.
In one embodiment of the invention, as shown in Figure 1, in the electromagnetic heating system IGBT Drive Protecting Circuit packet
Include main control chip 10 and driving chip 20.
Wherein, main control chip 10 is for exporting control signal such as PPG pulses.Driving chip 20 respectively with main control chip 10
It is connected with IGBT, i.e., the input terminal of driving chip 20 is connected with the control signal output of main control chip 10, driving chip 20
Output end is extremely connected with the G of IGBT.Driving chip 20 is built-in with temperature detecting unit 201, trigger element 202 and driving unit
203, driving unit 203 is used to generate drive pulse signal according to control signal, to drive IGBT to be switched on or off, that is,
It says, the control signal that driving unit 203 exports main control chip 10 is converted, output driving pulse signal to IGBT, to
Driving IGBT's is switched on or off.Temperature detecting unit 201 by detect IGBT temperature with output temperature detect signal to touch
Bill member 202, trigger element 202 according to temperature detection signal judge IGBT temperature be more than preset temperature (i.e. IGBT occurred
Temperature) when output trigger signal to driving unit 203 so that driving unit 203 drives IGBT shutdowns, realize the excess temperature of IGBT in time
Protection.
According to one embodiment of present invention, as shown in Figure 1 or 2, temperature detecting unit 201 includes：Temperature sampling heat
One end of quick resistance RT and first resistor R1, temperature sampling thermistor RT are grounded, one end of first resistor R1 and temperature sampling
The other end of thermistor RT is connected and there is first node, the other end of first resistor R1 to be connected with default power supply VCC, and first
Output end of the node as temperature detecting unit 201.
Wherein, temperature sampling thermistor RT is negative tempperature coefficient thermistor, i.e., when the temperature of IGBT is higher, temperature is adopted
The resistance value of sample thermistor RT is smaller, and the corresponding sampled voltage of temperature detection signal of first node output is smaller.
According to one embodiment of present invention, as shown in Figure 1 or 2, trigger element 202 include comparator U1 and with door electricity
The positive input terminal of road U2, comparator U1 are connected with first node, and negative input end and the reference voltage of comparator U1 provide end and be connected,
Comparator U1 provides the reference voltage signal Vref that end provides according to reference voltage and is compared temperature detection signal to judge
Whether the temperature of IGBT is more than preset temperature, and low level comparison signal is exported when the temperature of IGBT is more than preset temperature；With
The first input end of gate circuit U2 is connected with the output end of comparator U1, the second input terminal and the main control chip U1 of AND gate circuit U2
Output end be connected, the output end of AND gate circuit U2 is connected with the input terminal of driving unit 203, and AND gate circuit U2 is according to low level
Comparison signal exports low level trigger signal to driving unit 203 so that driving unit 203 stops driving output.
That is, increase comparator in trigger element 202, in this way when the temperature of IGBT is more than preset temperature, than
Low level comparison signal is exported compared with device, AND gate circuit exports low level trigger signal so that IGBT is turned off, and realizes IGBT mistakes in time
Temperature protection, and sampled without temperature AD, save the port resource of main control chip 10.
According to one embodiment of present invention, as shown in Figure 1 or 2, trigger element 202 further includes pull-up resistor R2, on
One end of pull-up resistor R2 is connected with the output end of comparator U1, and the other end of pull-up resistor R2 is connected with default power supply VCC.
In conclusion in an embodiment of the present invention, by be integrated in the thermistor element in driving chip 20 come pair
The temperature of IGBT is detected, and when the temperature of IGBT is more than preset temperature, that is, IGBT excess temperatures, trigger drive unit 203 stops
The driving of IGBT exports, and realizes the overheat protector of IGBT.
The Drive Protecting Circuit of IGBT in electromagnetic heating system according to the ... of the embodiment of the present invention, the built-in temperature in driving chip
Detection unit, trigger element and driving unit are spent, detects the temperature of IGBT, and trigger element by temperature detecting unit in this way
Trigger signal can be exported when the temperature of IGBT is more than preset temperature to driving unit, so that driving unit driving IGBT is closed
It is disconnected, to realize the overheat protector of IGBT in time.The Drive Protecting Circuit of the IGBT of the embodiment of the present invention as a result, is not necessarily to temperature
AD is sampled, and can be realized the excess temperature automatic protection of IGBT in time, be substantially reduced the probability that IGBT excess temperatures are burnt, and is improved reliable
Property, ensure electromagnetic heating system safe and reliable operation.
According to one embodiment of present invention, as shown in Fig. 2, first node also with the AD sampling end phases of main control chip 10
Even, main control chip 10 also samples to obtain the temperature of IGBT, and IGBT's temperature detection signal by AD sampling ends
Temperature stops output control signal when being more than preset temperature, to drive IGBT shutdowns by driving unit 203.
That is, in the present embodiment, by being integrated in the thermistor element in driving chip 20 come to IGBT's
Temperature is detected, and when the temperature of IGBT is more than preset temperature, that is, IGBT excess temperatures, trigger drive unit 203 stops IGBT's
Driving output, while main control chip 10 also judges whether the temperature of IGBT is more than preset temperature by temperature AD sampling, and
The temperature of IGBT stops output control signal when being more than preset temperature, to drive IGBT shutdowns by driving unit 203, so as to
It is enough to realize to the dual overheat protectors of IGBT, substantially increase reliability.
Also, as shown in Fig. 2, first node is also connected to ground by the first capacitance C1, the first capacitance C1 realizes AD samplings
Filter action.
According to one embodiment of present invention, IGBT is arranged at the electric-controlled plate of the electromagnetic heating system with driving chip
On, and the poles E of the IGBT are connect with the reference ground GND of the driving chip, also, the poles E of IGBT and the driving chip
The distance between reference ground be less than 20mm, it is accurate to thereby may be ensured that the temperature of IGBT measures, substantially increases overheat protector
Precision.
In addition, the embodiment of the present invention also proposed a kind of electromagnetic heating system comprising in above-mentioned electromagnetic heating system
The Drive Protecting Circuit of IGBT.
The electromagnetic heating system of the embodiment of the present invention is adopted by the Drive Protecting Circuit of above-mentioned IGBT without temperature AD
Sample can realize the excess temperature automatic protection of IGBT in time, substantially reduce the probability that IGBT excess temperatures are burnt, improve reliability.
It should be appreciated that each section of the present invention can be realized with hardware, software, firmware or combination thereof.Above-mentioned
In embodiment, software that multiple steps or method can in memory and by suitable instruction execution system be executed with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit application-specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In addition, in the description of the present invention, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ",
"upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " clockwise ", " inverse time
The orientation or positional relationship of the instructions such as needle ", " axial direction ", " radial direction ", " circumferential direction " is to be based on the orientation or positional relationship shown in the drawings,
Be merely for convenience of description of the present invention and simplification of the description, do not indicate or imply the indicated device or element must have it is 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 (9)
1. the Drive Protecting Circuit of IGBT in a kind of electromagnetic heating system, which is characterized in that including：
Main control chip, the main control chip is for exporting control signal；
Driving chip, the driving chip are connected with the main control chip and the IGBT respectively, and the driving chip is built-in with
Temperature detecting unit, trigger element and driving unit, the driving unit are used to generate driving pulse according to the control signal
Signal, to drive the IGBT to be switched on or off, the temperature detecting unit is by detecting the temperature of the IGBT to export temperature
For degree detection signal to the trigger element, the trigger element judges that the temperature of the IGBT is big according to the temperature detection signal
Trigger signal is exported when preset temperature to the driving unit, so that the driving unit drives the IGBT shutdowns.
2. the Drive Protecting Circuit of IGBT in electromagnetic heating system as described in claim 1, which is characterized in that the temperature inspection
Surveying unit includes：
Temperature sampling thermistor, one end ground connection of the temperature sampling thermistor；
First resistor, one end of the first resistor are connected with the other end of the temperature sampling thermistor and have first segment
Point, the other end of the first resistor are connected with default power supply, output of the first node as the temperature detecting unit
End.
3. the Drive Protecting Circuit of IGBT in electromagnetic heating system as claimed in claim 2, which is characterized in that the triggering is single
Member includes：
Comparator, the positive input terminal of the comparator are connected with the first node, the negative input end of the comparator and reference
Voltage provides end and is connected, and the comparator provides the reference voltage signal that end provides according to the reference voltage and examined to the temperature
It surveys signal to be compared to judge whether the temperature of the IGBT is more than preset temperature, and is more than in the temperature of the IGBT and presets
Low level comparison signal is exported when temperature；
AND gate circuit, the first input end of the AND gate circuit are connected with the output end of the comparator, the AND gate circuit
Second input terminal is connected with the output end of the main control chip, the input of the output end of the AND gate circuit and the driving unit
End is connected, and the AND gate circuit exports low level trigger signal to the driving unit according to the low level comparison signal.
4. the Drive Protecting Circuit of IGBT in electromagnetic heating system as claimed in claim 3, which is characterized in that the triggering is single
Member further includes pull-up resistor, and one end of the pull-up resistor is connected with the output end of the comparator, the pull-up resistor it is another
One end is connected with the default power supply.
5. the Drive Protecting Circuit of IGBT in electromagnetic heating system as claimed in claim 2, which is characterized in that the first segment
Point is also connected with the AD sampling ends of the main control chip, and the main control chip is also by the AD sampling ends to the temperature detection
Signal is sampled to obtain the temperature of the IGBT, and is stopped described in output when the temperature of the IGBT is more than preset temperature
Signal is controlled, to drive the IGBT to turn off by the driving unit.
6. the Drive Protecting Circuit of IGBT in electromagnetic heating system as claimed in claim 2, which is characterized in that the temperature is adopted
Sample thermistor is negative tempperature coefficient thermistor.
7. the Drive Protecting Circuit of IGBT in the electromagnetic heating system as described in any one of claim 1-6, which is characterized in that
The IGBT is arranged at the driving chip on the electric-controlled plate of the electromagnetic heating system, and the poles E of the IGBT and institute
State the reference ground connection of driving chip.
8. the Drive Protecting Circuit of IGBT in electromagnetic heating system as claimed in claim 7, which is characterized in that the IGBT's
The distance between the poles E and the reference ground of the driving chip are less than 20mm.
9. a kind of electromagnetic heating system, which is characterized in that include the electromagnetic heating system as described in any one of claim 1-8
The Drive Protecting Circuit of middle IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710302264.6A CN108809283A (en) | 2017-05-02 | 2017-05-02 | The Drive Protecting Circuit of electromagnetic heating system and its IGBT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710302264.6A CN108809283A (en) | 2017-05-02 | 2017-05-02 | The Drive Protecting Circuit of electromagnetic heating system and its IGBT |
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| Publication Number | Publication Date |
|---|---|
| CN108809283A true CN108809283A (en) | 2018-11-13 |
Family
ID=64054158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710302264.6A Pending CN108809283A (en) | 2017-05-02 | 2017-05-02 | The Drive Protecting Circuit of electromagnetic heating system and its IGBT |
Country Status (1)
| Country | Link |
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| CN (1) | CN108809283A (en) |
Cited By (1)
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| CN110489308A (en) * | 2019-09-17 | 2019-11-22 | 天津天地伟业信息系统集成有限公司 | A kind of method of control CPU heating under low temperature |
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Application publication date: 20181113 |