CN108235481A - A kind of guard method of IGBT collector voltages, device and electromagnetic oven based on power input voltage - Google Patents
A kind of guard method of IGBT collector voltages, device and electromagnetic oven based on power input voltage Download PDFInfo
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- CN108235481A CN108235481A CN201611199172.1A CN201611199172A CN108235481A CN 108235481 A CN108235481 A CN 108235481A CN 201611199172 A CN201611199172 A CN 201611199172A CN 108235481 A CN108235481 A CN 108235481A
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- igbt
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- collector
- input voltage
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- 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
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- Protection Of Static Devices (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The present invention relates to a kind of guard method of IGBT collector voltages, device and electromagnetic ovens based on power input voltage, are related to IGBT collector voltages protection field.Purpose is to solve the problems, such as that the IGBT collector protection reliabilities in current electromagnetic heating system are poor.The method includes：Acquire the power input voltage in electromagnetic heating system；Acquire the collector voltage of IGBT in electromagnetic heating system；Compare power input voltage and collector voltage, the break-make of IGBT is controlled according to comparison result.IGBT collector voltages guard method proposed by the present invention is by directly comparing collector sampled voltage and power input sampled voltage, as long as reaching target voltage, that is, stops heating.Since the collector voltage that each power input voltage generates is different, the present invention precisely effectively can carry out reliably protecting to the collector voltage of IGBT under different input voltages in real time.
Description
Technical field
The present invention relates to IGBT collector voltages to protect field.
Background technology
In existing electromagnetic heating system, in order to which the collector of IGBT is protected by over-voltage breakdown, often not increase in hardware
The comparison of one C pole tensions sampling, if C pole tensions are excessively high, hardware directly limits maximum and opens pulsewidth.But due to power grid not
Stablize, the reference voltage using benchmark power grid 220V voltages compares, and can sacrifice the protective effect under other voltages significantly.Such as
The IGBT of 1200V is 1100V using protection voltage, 220V normally protected, but for 180V voltages, be that electric current increases,
And C pole tensions are relatively low may there was only 1000V, just do not have protective effect.
Invention content
The technical problems to be solved by the invention are to provide a kind of IGBT collector voltages based on power input voltage and protect
Maintaining method, device and electromagnetic oven, it is therefore intended that solve the IGBT collectors protection reliability difference in current electromagnetic heating system
Problem.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of IGBT collectors based on power input voltage
Voltage protection method, the method includes：
Power input voltage in S1, acquisition electromagnetic heating system；
The collector voltage of IGBT in S2, acquisition electromagnetic heating system；
S3, compare the collector voltage acquired in the power input voltage and S2 acquired in S1, controlled according to comparison result
The break-make of IGBT.
The beneficial effects of the invention are as follows：IGBT collector voltages guard method proposed by the present invention is by directly comparing current collection
Pole sampled voltage and power input sampled voltage as long as reaching target voltage, that is, stop heating.Due to each power input voltage
The collector voltage of generation is different, and the method can be precisely in real time effectively to the collector electricity of IGBT under different input voltages
Pressure carries out reliably protecting.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the power input voltage acquired in the S1 is the reference voltage of IGBT collector voltages protection.
Further, it in the S3, when collector voltage is more than power input voltage, controls in electromagnetic heating system
IGBT drive module carries out shutdown operation to IGBT.
Advantageous effect using above-mentioned further scheme is：Using the power input voltage of acquisition as IGBT collector voltages
The reference voltage of protection when the sampled voltage of IGBT collectors is more than the sampled value of power input voltage, that is, carries out over-pressed guarantor
Shield, controls the shutdown of IGBT, so as to the threshold value by adjusting reference voltage in real time automatically, to match the protection of different voltages essence
Degree promotes reliability.
In order to solve the above-mentioned technical problem, the invention also provides a kind of IGBT collectors electricity based on power input voltage
Protective device is pressed, described device includes：
Power input voltage acquisition module, for acquiring the power input voltage in electromagnetic heating system；
Collector voltage acquisition module, for acquiring the collector voltage of IGBT in electromagnetic heating system；
For comparing power input voltage and collector voltage, the break-make of IGBT is controlled according to comparison result for comparison module.
The beneficial effects of the invention are as follows：IGBT collector voltages protective device proposed by the present invention is by directly comparing current collection
Pole sampled voltage and power input sampled voltage as long as reaching target voltage, that is, stop heating.Due to each power input voltage
The collector voltage of generation is different, this device can be precisely in real time effectively to the collector electricity of IGBT under different input voltages
Pressure carries out reliably protecting.
Further, the power input voltage acquisition module includes diode D1 and D2, resistance R1 to R7, capacitance C1 and electricity
Capacitance EC1 is solved,
The anode of the diode D1 and the anode of diode D2 connect the firewire and zero curve of power supply respectively,
The resistance R1 to R5 is sequentially connected in series series circuit,
One end of the series circuit is connect with the cathode of diode D1 and the cathode of diode D2,
The other end of the series circuit and the anode of one end of resistance R6, one end of resistance R7 and electrolytic capacitor EC1 connect
It connects；
The other end of the resistance R7 is connect as the output terminal of power input voltage acquisition module with one end of capacitance C1,
The other end of the capacitance C1 connect and is grounded with the other end of the cathode of electrolytic capacitor EC1 and resistance R6.
Advantageous effect using above-mentioned further scheme is：Power input voltage can be carried out by more than circuit structure
Accurate acquisition.
Further, the voltage of the output terminal output of the power input voltage acquisition module is protected for IGBT collector voltages
Reference voltage.
Advantageous effect using above-mentioned further scheme is：Using the power input voltage of acquisition as IGBT collector voltages
The reference voltage of protection when the sampled voltage of IGBT collectors is more than the sampled value of power input voltage, that is, carries out over-pressed guarantor
Shield, controls the shutdown of IGBT, so as to the threshold value by adjusting reference voltage in real time automatically, to match the protection of different voltages essence
Degree promotes reliability.
Further, the collector voltage acquisition module includes resistance R8 to R10, and one end of the resistance R8 adds with electromagnetism
The collector connection of IGBT in hot systems, the other end of resistance R8 is as the output terminal of collector voltage acquisition module and resistance R9
One end connection, the other end of resistance R9 connect with one end of resistance R10, and the other end of resistance R10 is grounded.
Advantageous effect using above-mentioned further scheme is：By more than circuit structure can to IGBT collector voltages into
The accurate acquisition of row.
Further, the comparison module include comparator CMP1 and with door chip, the positive of the comparator CMP1 inputs
End is connect with collector voltage acquisition module output terminal, inverting input and the power input voltage acquisition module of comparator CMP1
Output terminal connection, the output terminal of comparator CMP1 connect with the first input end of door chip, is inputted with the second of door chip
End is connect with the output terminal of IGBT controls comparator in electromagnetic heating system, and in the output terminal and electromagnetic heating system of door chip
The input terminal connection of IGBT drive module.
Advantageous effect using above-mentioned further scheme is：Comparator CMP1 compares collector voltage acquisition module output terminal
The power input voltage of the output terminal output of the collector voltage and power input voltage acquisition module of output, when collector electricity
When pressure is more than power input voltage, comparator CMP1 output switching activity level makes to stop exporting with door chip, and then electromagnetism is controlled to add
IGBT drive module makes IGBT be forced to turn off in hot systems, realizes overvoltage protection.
The present invention also proposes to include the IGBT collector voltage protective devices described above based on power input voltage
Electromagnetic oven, the protection precisions of different voltages can be matched, promote reliability.
Description of the drawings
Fig. 1 is the flow chart of the IGBT collector voltage guard methods described in the embodiment of the present invention one；
Fig. 2 is the principle schematic of the IGBT collector voltage protective devices described in the embodiment of the present invention two；
Fig. 3 is the circuit diagram of the power input voltage acquisition module described in the embodiment of the present invention two；
Fig. 4 is the circuit diagram of the collector voltage acquisition module described in the embodiment of the present invention two；
Fig. 5 is the principle schematic of the comparison module described in the embodiment of the present invention two.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
Embodiment one
In the electromagnetic heating system of electromagnetic oven, different input voltages produces entire electromagnetic heating system on IGBT
Raw collector voltage is different, if compared using the reference voltage of benchmark power grid 220V voltages, can significantly sacrifice at other
Protective effect under voltage, therefore, the present embodiment propose a kind of IGBT collectors based on power input voltage as shown in Figure 1
Voltage protection method, the method includes：
Power input voltage in S1, acquisition electromagnetic heating system；
The collector voltage of IGBT in S2, acquisition electromagnetic heating system；
S3, compare the collector voltage acquired in the power input voltage and S2 acquired in S1, controlled according to comparison result
The break-make of IGBT.
The power input voltage acquired in wherein S1 is the reference voltage of IGBT collector voltages protection, when IGBT collectors
Sampled voltage be more than power input voltage sampled value when, that is, carry out overvoltage protection, control the shutdown of IGBT.
The method that the present embodiment is proposed is by directly comparing collector voltage and power input voltage, as long as reaching target
Voltage stops heating, since the collector voltage that each power input voltage generates is different, by power input voltage
As the reference voltage of IGBT collector voltages protection, so as to the threshold value by adjusting reference voltage in real time automatically, to match not
With the protection precision of voltage, reliability is promoted.
Embodiment two
The present embodiment proposes a kind of IGBT collector voltage protective devices based on power input voltage, as shown in Fig. 2, should
Device includes：
Power input voltage acquisition module, for acquiring the power input voltage in electromagnetic heating system；
Collector voltage acquisition module, for acquiring the collector voltage of IGBT in electromagnetic heating system；
For comparing power input voltage and collector voltage, the break-make of IGBT is controlled according to comparison result for comparison module.
Specifically, as shown in figure 3, the power input voltage acquisition module include diode D1 and D2, resistance R1 to R7,
Capacitance C1 and electrolytic capacitor EC1,
The anode of the diode D1 and the anode of diode D2 connect the firewire and zero curve of power supply respectively,
The resistance R1 to R5 is sequentially connected in series series circuit,
One end of the series circuit is connect with the cathode of diode D1 and the cathode of diode D2,
The other end of the series circuit and the anode of one end of resistance R6, one end of resistance R7 and electrolytic capacitor EC1 connect
It connects；
The other end of the resistance R7 is connect as the output terminal of power input voltage acquisition module with one end of capacitance C1,
The other end of the capacitance C1 connect and is grounded with the other end of the cathode of electrolytic capacitor EC1 and resistance R6.
The reference voltage that the power input voltage of acquisition is protected as IGBT collector voltages, when adopting for IGBT collectors
When sample voltage is more than the sampled value of power input voltage, that is, overvoltage protection is carried out, controls the shutdown of IGBT, so as to by automatic real
When adjust the threshold value of reference voltage, to match the protection precision of different voltages, promote reliability.
As shown in figure 4, the collector voltage acquisition module includes resistance R8 to R10, one end and the electricity of the resistance R8
The collector connection of IGBT in magnetic heating system, the other end of resistance R8 as collector voltage acquisition module output terminal with it is electric
One end connection of R9 is hindered, the other end of resistance R9 is connect with one end of resistance R10, the other end ground connection of resistance R10.
As shown in figure 5, the comparison module include comparator CMP1 and with door chip, the positive of the comparator CMP1 is defeated
Enter end to connect with collector voltage acquisition module output terminal, inverting input and the power input voltage of comparator CMP1 acquire mould
The output terminal connection of block, the output terminal of comparator CMP1 is connect with the first input end of door chip, defeated with the second of door chip
Enter end controls the output terminal of comparator to connect with IGBT in electromagnetic heating system, output terminal and electromagnetic heating system with door chip
The input terminal connection of middle IGBT drive module.
Comparator CMP1 compares the collector voltage of collector voltage acquisition module output terminal output and power input electricity
Press the power input voltage of the output terminal output of acquisition module, when collector voltage is more than power input voltage, comparator
CMP1 output switching activity level makes to stop exporting with door chip, and then IGBT drive module in electromagnetic heating system is controlled to make IGBT quilts
It is forced shutdown, realizes overvoltage protection.
Embodiment three
The present embodiment proposition is a kind of to include the IGBT collector voltages protection described above based on power input voltage
The electromagnetic oven of device is directly compared power input voltage and collector voltage by comparing device, precisely reliable in real time
The protection voltage of IGBT collectors under different input voltages is controlled, the protection precision of different voltages can be matched, is promoted reliable
Property.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of IGBT collector voltage guard methods based on power input voltage, which is characterized in that the method includes：
Power input voltage in S1, acquisition electromagnetic heating system；
The collector voltage of IGBT in S2, acquisition electromagnetic heating system；
S3, compare the collector voltage acquired in the power input voltage and S2 acquired in S1, IGBT is controlled according to comparison result
Break-make.
2. a kind of IGBT collector voltage guard methods based on power input voltage according to claim 1, feature
It is, the power input voltage acquired in the S1 is the reference voltage of IGBT collector voltages protection.
3. a kind of IGBT collector voltage guard methods based on power input voltage according to claim 1 or 2, special
Sign is, in the S3, when collector voltage is more than power input voltage, controls the IGBT driving moulds in electromagnetic heating system
Block carries out shutdown operation to IGBT.
4. a kind of IGBT collector voltage protective devices based on power input voltage, which is characterized in that described device includes：
Power input voltage acquisition module, for acquiring the power input voltage in electromagnetic heating system；
Collector voltage acquisition module, for acquiring the collector voltage of IGBT in electromagnetic heating system；
For comparing power input voltage and collector voltage, the break-make of IGBT is controlled according to comparison result for comparison module.
5. a kind of IGBT collector voltage protective devices based on power input voltage according to claim 4, feature
It is, the power input voltage acquisition module includes diode D1 and D2, resistance R1 to R7, capacitance C1 and electrolytic capacitor EC1,
The anode of the diode D1 and the anode of diode D2 connect the firewire and zero curve of power supply respectively,
The resistance R1 to R5 is sequentially connected in series series circuit,
One end of the series circuit is connect with the cathode of diode D1 and the cathode of diode D2,
The other end of the series circuit is connect with the anode of one end of resistance R6, one end of resistance R7 and electrolytic capacitor EC1；
The other end of the resistance R7 is connect as the output terminal of power input voltage acquisition module with one end of capacitance C1,
The other end of the capacitance C1 connect and is grounded with the other end of the cathode of electrolytic capacitor EC1 and resistance R6.
6. a kind of IGBT collector voltage protective devices based on power input voltage according to claim 5, feature
It is, the voltage of the output terminal output of the power input voltage acquisition module is electric for the reference of IGBT collector voltages protection
Pressure.
7. a kind of IGBT collector voltage protective devices based on power input voltage according to claim 5 or 6, special
Sign is, the collector voltage acquisition module includes resistance R8 to R10, in one end and electromagnetic heating system of the resistance R8
The collector connection of IGBT, the other end of resistance R8 connect as the output terminal of collector voltage acquisition module and one end of resistance R9
It connects, the other end of resistance R9 is connect with one end of resistance R10, the other end ground connection of resistance R10.
8. a kind of IGBT collector voltage protective devices based on power input voltage according to claim 7, feature
Be, the comparison module include comparator CMP1 and with door chip, the normal phase input end and collector of the comparator CMP1
Voltage acquisition module output terminal connects, and the inverting input of comparator CMP1 connects with the output terminal of power input voltage acquisition module
It connects, the output terminal of comparator CMP1 is connect with the first input end of door chip, is added with the second input terminal and the electromagnetism of door chip
IGBT controls the output terminal connection of comparator in hot systems, and mould is driven with IGBT in the output terminal and electromagnetic heating system of door chip
The input terminal connection of block.
9. a kind of electromagnetic oven, which is characterized in that it is defeated based on power supply that the electromagnetic oven includes claim 4 to 8 any one of them
Enter the IGBT collector voltage protective devices of voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611199172.1A CN108235481B (en) | 2016-12-22 | 2016-12-22 | IGBT collector voltage protection method and device based on power supply input voltage and induction cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611199172.1A CN108235481B (en) | 2016-12-22 | 2016-12-22 | IGBT collector voltage protection method and device based on power supply input voltage and induction cooker |
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| CN108235481A true CN108235481A (en) | 2018-06-29 |
| CN108235481B CN108235481B (en) | 2021-03-30 |
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| CN201571006U (en) * | 2009-11-16 | 2010-09-01 | 肖海乐 | Brake unit |
| CN202260995U (en) * | 2011-10-14 | 2012-05-30 | 广东易事特电源股份有限公司 | IGBT (Insulated Gate Bipolar Transistor) driving circuit |
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