CN108235481B - IGBT collector voltage protection method and device based on power supply input voltage and induction cooker - Google Patents
IGBT collector voltage protection method and device based on power supply input voltage and induction cooker Download PDFInfo
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- CN108235481B CN108235481B CN201611199172.1A CN201611199172A CN108235481B CN 108235481 B CN108235481 B CN 108235481B CN 201611199172 A CN201611199172 A CN 201611199172A CN 108235481 B CN108235481 B CN 108235481B
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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
Abstract
The invention relates to an IGBT collector voltage protection method and device based on power supply input voltage and an induction cooker, and relates to the field of IGBT collector voltage protection. The problem of IGBT collector protection reliability among the present electromagnetic heating system is poor is solved to aim at. The method comprises the following steps: collecting power supply input voltage in an electromagnetic heating system; collecting the collector voltage of an IGBT in an electromagnetic heating system; and comparing the input voltage of the power supply and the voltage of the collector, and controlling the on-off of the IGBT according to the comparison result. According to the IGBT collector voltage protection method provided by the invention, the heating is stopped as long as the target voltage is reached by directly comparing the collector sampling voltage with the power input sampling voltage. Because the collector voltages generated by the input voltages of each power supply are different, the IGBT power supply can accurately and effectively reliably protect the collector voltages of the IGBTs under different input voltages in real time.
Description
Technical Field
The invention relates to the field of IGBT collector voltage protection.
Background
In the existing electromagnetic heating system, in order to protect a collector of an IGBT from overvoltage breakdown, comparison of C voltage sampling is often added in hardware, and if the C voltage is too high, the hardware directly limits the maximum opening pulse width. However, due to the instability of the power grid, the protection effect under other voltages can be greatly sacrificed by using the reference voltage comparison of the 220V voltage of the reference power grid. For example, for an IGBT of 1200V, the protection voltage is 1100V, and for 220V, normal protection is performed, but for 180V, the current is increased, and the C voltage is relatively low, which may be only 1000V, and thus the protection effect is not performed.
Disclosure of Invention
The invention aims to solve the technical problem of providing an IGBT collector voltage protection method and device based on power supply input voltage and an induction cooker, and aims to solve the problem of poor IGBT collector protection reliability in the existing electromagnetic heating system.
The technical scheme for solving the technical problems is as follows: a method of IGBT collector voltage protection based on a power supply input voltage, the method comprising:
s1, collecting power supply input voltage in the electromagnetic heating system;
s2, collecting the collector voltage of the IGBT in the electromagnetic heating system;
and S3, comparing the power supply input voltage collected in S1 with the collector voltage collected in S2, and controlling the on-off of the IGBT according to the comparison result.
The invention has the beneficial effects that: according to the IGBT collector voltage protection method provided by the invention, the heating is stopped as long as the target voltage is reached by directly comparing the collector sampling voltage with the power input sampling voltage. Because the collector voltages generated by the input voltages of each power supply are different, the method can accurately and effectively carry out reliable protection on the collector voltages of the IGBTs under different input voltages in real time.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the power input voltage collected in S1 is a reference voltage for IGBT collector voltage protection.
Further, in S3, when the collector voltage is greater than the power input voltage, the IGBT driving module in the electromagnetic heating system is controlled to turn off the IGBT.
The beneficial effect of adopting the further scheme is that: the collected power input voltage is used as the reference voltage for IGBT collector voltage protection, when the sampling voltage of the IGBT collector is greater than the sampling value of the power input voltage, overvoltage protection is performed, the IGBT is controlled to be turned off, therefore, the protection precision of different voltages is matched by automatically adjusting the threshold value of the reference voltage in real time, and the reliability is improved.
In order to solve the above technical problem, the present invention further provides an IGBT collector voltage protection device based on a power supply input voltage, the device including:
the power input voltage acquisition module is used for acquiring power input voltage in the electromagnetic heating system;
the collector voltage acquisition module is used for acquiring the collector voltage of the IGBT in the electromagnetic heating system;
and the comparison module is used for comparing the input voltage of the power supply and the voltage of the collector and controlling the on-off of the IGBT according to the comparison result.
The invention has the beneficial effects that: the IGBT collector voltage protection device provided by the invention directly compares the collector sampling voltage with the power input sampling voltage, and stops heating as long as the target voltage is reached. Because the collector voltage that every power input voltage produced is different, this device can be accurate real-time effectual carries out reliable protection to the collector voltage of IGBT under the different input voltage.
Further, the power input voltage acquisition module comprises diodes D1 and D2, resistors R1 to R7, a capacitor C1 and an electrolytic capacitor EC1,
the anode of the diode D1 and the anode of the diode D2 are respectively connected with the live wire and the neutral wire of the power supply,
the resistors R1 to R5 are connected in series in sequence to form a series circuit,
one end of the series circuit is connected to the cathode of the diode D1 and the cathode of the diode D2,
the other end of the series circuit is connected with one end of a resistor R6, one end of a resistor R7 and the anode of an electrolytic capacitor EC 1;
the other end of the resistor R7 is used as the output end of the power supply input voltage acquisition module and is connected with one end of the capacitor C1,
the other end of the capacitor C1 is connected with the negative electrode of the electrolytic capacitor EC1 and the other end of the resistor R6 and grounded.
The beneficial effect of adopting the further scheme is that: the circuit structure can accurately collect the input voltage of the power supply.
Further, the voltage output by the output end of the power input voltage acquisition module is a reference voltage protected by the IGBT collector voltage.
The beneficial effect of adopting the further scheme is that: the collected power input voltage is used as the reference voltage for IGBT collector voltage protection, when the sampling voltage of the IGBT collector is greater than the sampling value of the power input voltage, overvoltage protection is performed, the IGBT is controlled to be turned off, therefore, the protection precision of different voltages is matched by automatically adjusting the threshold value of the reference voltage in real time, and the reliability is improved.
Further, the collector voltage acquisition module comprises resistors R8 to R10, one end of the resistor R8 is connected with the collector of the IGBT in the electromagnetic heating system, the other end of the resistor R8 is connected with one end of the resistor R9 as the output end of the collector voltage acquisition module, the other end of the resistor R9 is connected with one end of the resistor R10, and the other end of the resistor R10 is grounded.
The beneficial effect of adopting the further scheme is that: the IGBT collector voltage can be accurately acquired through the circuit structure.
Further, the comparison module comprises a comparator CMP1 and an AND gate chip, wherein a positive phase input end of the comparator CMP1 is connected with an output end of the collector voltage acquisition module, a negative phase input end of the comparator CMP1 is connected with an output end of the power input voltage acquisition module, an output end of the comparator CMP1 is connected with a first input end of the AND gate chip, a second input end of the AND gate chip is connected with an output end of an IGBT control comparator in the electromagnetic heating system, and an output end of the AND gate chip is connected with an input end of an IGBT driving module in the electromagnetic heating system.
The beneficial effect of adopting the further scheme is that: the comparator CMP1 compares the collector voltage output by the output end of the collector voltage acquisition module with the power input voltage output by the output end of the power input voltage acquisition module, when the collector voltage exceeds the power input voltage, the comparator CMP1 outputs a turnover level to enable the AND gate chip to stop outputting, and then the IGBT driving module in the electromagnetic heating system is controlled to enable the IGBT to be forcibly turned off, so that overvoltage protection is realized.
The invention also provides an induction cooker comprising the IGBT collector voltage protection device based on the power supply input voltage, which can match protection precision of different voltages and improve reliability.
Drawings
Fig. 1 is a flowchart of an IGBT collector voltage protection method according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of the IGBT collector voltage protection device according to the second embodiment of the present invention;
fig. 3 is a circuit diagram of a power input voltage acquisition module according to a second embodiment of the invention;
fig. 4 is a circuit diagram of a collector voltage acquisition module according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of a comparison module according to a second embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example one
In an electromagnetic heating system of an induction cooker, different input voltages, different collector voltages generated on IGBTs for the entire electromagnetic heating system, and if a reference voltage comparison of a 220V voltage of a reference grid is used, the protection effect under other voltages is greatly sacrificed, therefore, the present embodiment proposes a method for protecting the collector voltage of the IGBT based on the input voltage of a power supply as shown in fig. 1, the method comprising:
s1, collecting power supply input voltage in the electromagnetic heating system;
s2, collecting the collector voltage of the IGBT in the electromagnetic heating system;
and S3, comparing the power supply input voltage collected in S1 with the collector voltage collected in S2, and controlling the on-off of the IGBT according to the comparison result.
The power input voltage collected in S1 is a reference voltage for IGBT collector voltage protection, and when the sampled voltage of the IGBT collector is greater than the sampled value of the power input voltage, overvoltage protection is performed to control turn-off of the IGBT.
According to the method provided by the embodiment, the collector voltage and the power supply input voltage are directly compared, heating is stopped as long as the target voltage is reached, and the collector voltage generated by each power supply input voltage is different, so that the power supply input voltage is used as the reference voltage for IGBT collector voltage protection, the protection precision of different voltages is matched by automatically adjusting the threshold value of the reference voltage in real time, and the reliability is improved.
Example two
The present embodiment proposes an IGBT collector voltage protection device based on a power supply input voltage, as shown in fig. 2, the device includes:
the power input voltage acquisition module is used for acquiring power input voltage in the electromagnetic heating system;
the collector voltage acquisition module is used for acquiring the collector voltage of the IGBT in the electromagnetic heating system;
and the comparison module is used for comparing the input voltage of the power supply and the voltage of the collector and controlling the on-off of the IGBT according to the comparison result.
Specifically, as shown in fig. 3, the power input voltage collecting module includes diodes D1 and D2, resistors R1 to R7, a capacitor C1 and an electrolytic capacitor EC1,
the anode of the diode D1 and the anode of the diode D2 are respectively connected with the live wire and the neutral wire of the power supply,
the resistors R1 to R5 are connected in series in sequence to form a series circuit,
one end of the series circuit is connected to the cathode of the diode D1 and the cathode of the diode D2,
the other end of the series circuit is connected with one end of a resistor R6, one end of a resistor R7 and the anode of an electrolytic capacitor EC 1;
the other end of the resistor R7 is used as the output end of the power supply input voltage acquisition module and is connected with one end of the capacitor C1,
the other end of the capacitor C1 is connected with the negative electrode of the electrolytic capacitor EC1 and the other end of the resistor R6 and grounded.
The collected power input voltage is used as the reference voltage for IGBT collector voltage protection, when the sampling voltage of the IGBT collector is greater than the sampling value of the power input voltage, overvoltage protection is performed, the IGBT is controlled to be turned off, therefore, the protection precision of different voltages is matched by automatically adjusting the threshold value of the reference voltage in real time, and the reliability is improved.
As shown in fig. 4, the collector voltage collecting module includes resistors R8 to R10, one end of the resistor R8 is connected to a collector of an IGBT in the electromagnetic heating system, the other end of the resistor R8 is connected to one end of a resistor R9 as an output end of the collector voltage collecting module, the other end of the resistor R9 is connected to one end of a resistor R10, and the other end of the resistor R10 is grounded.
As shown in fig. 5, the comparison module includes a comparator CMP1 and an and gate chip, a positive phase input terminal of the comparator CMP1 is connected to an output terminal of the collector voltage acquisition module, a negative phase input terminal of the comparator CMP1 is connected to an output terminal of the power input voltage acquisition module, an output terminal of the comparator CMP1 is connected to a first input terminal of the and gate chip, a second input terminal of the and gate chip is connected to an output terminal of an IGBT control comparator CMP4 in the electromagnetic heating system, and an output terminal of the and gate chip is connected to an input terminal of an IGBT driving module in the electromagnetic heating system.
The comparator CMP1 compares the collector voltage output by the output end of the collector voltage acquisition module with the power input voltage output by the output end of the power input voltage acquisition module, when the collector voltage exceeds the power input voltage, the comparator CMP1 outputs a turnover level to enable the AND gate chip to stop outputting, and then the IGBT driving module in the electromagnetic heating system is controlled to enable the IGBT to be forcibly turned off, so that overvoltage protection is realized.
EXAMPLE III
According to the electromagnetic oven comprising the IGBT collector voltage protection device based on the power input voltage, the power input voltage and the collector voltage are directly compared through the comparator, the protection voltage of the IGBT collector under different input voltages is accurately, reliably and timely controlled, the protection precision of different voltages can be matched, and the reliability is improved. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. An IGBT collector voltage protection method based on power supply input voltage is characterized by comprising the following steps:
s1, collecting power supply input voltage in the electromagnetic heating system;
s2, collecting the collector voltage of the IGBT in the electromagnetic heating system;
s3, comparing the power supply input voltage collected in S1 with the collector voltage collected in S2, and controlling the on-off of the IGBT according to the comparison result;
and in S3, when the collector voltage is greater than the power input voltage, controlling an IGBT driving module in the electromagnetic heating system to turn off the IGBT.
2. The method according to claim 1, wherein the power input voltage collected in S1 is a reference voltage for IGBT collector voltage protection.
3. An IGBT collector voltage protection device based on a power supply input voltage, the device comprising:
the power input voltage acquisition module is used for acquiring power input voltage in the electromagnetic heating system;
the collector voltage acquisition module is used for acquiring the collector voltage of the IGBT in the electromagnetic heating system;
the comparison module is used for comparing the input voltage of the power supply and the voltage of the collector and controlling the on-off of the IGBT according to the comparison result;
the comparison module is specifically used for controlling the turn-off of the IGBT when the sampling voltage of the IGBT collector electrode is larger than the sampling value of the power supply input voltage.
4. The IGBT collector voltage protection device based on the power input voltage as claimed in claim 3, wherein the power input voltage acquisition module comprises diodes D1 and D2, resistors R1 to R7, a capacitor C1 and an electrolytic capacitor EC1,
the anode of the diode D1 and the anode of the diode D2 are respectively connected with the live wire and the neutral wire of the power supply,
the resistors R1 to R5 are connected in series in sequence to form a series circuit,
one end of the series circuit is connected to the cathode of the diode D1 and the cathode of the diode D2,
the other end of the series circuit is connected with one end of a resistor R6, one end of a resistor R7 and the anode of an electrolytic capacitor EC 1;
the other end of the resistor R7 is used as the output end of the power supply input voltage acquisition module and is connected with one end of the capacitor C1,
the other end of the capacitor C1 is connected with the negative electrode of the electrolytic capacitor EC1 and the other end of the resistor R6 and grounded.
5. The IGBT collector voltage protection device based on the power input voltage as claimed in claim 4, wherein the voltage outputted by the output terminal of the power input voltage acquisition module is a reference voltage for IGBT collector voltage protection.
6. The IGBT collector voltage protection device based on the power supply input voltage as claimed in claim 4 or 5, wherein the collector voltage collecting module comprises resistors R8 to R10, one end of the resistor R8 is connected with the collector of the IGBT in the electromagnetic heating system, the other end of the resistor R8 is connected with one end of a resistor R9 as the output end of the collector voltage collecting module, the other end of the resistor R9 is connected with one end of a resistor R10, and the other end of the resistor R10 is grounded.
7. The IGBT collector voltage protection device based on the input voltage of the power supply as claimed in claim 6, wherein the comparison module comprises a comparator CMP1 and an AND gate chip, the positive input terminal of the comparator CMP1 is connected with the output terminal of the collector voltage collection module, the negative input terminal of the comparator CMP1 is connected with the output terminal of the input voltage collection module of the power supply, the output terminal of the comparator CMP1 is connected with the first input terminal of the AND gate chip, the second input terminal of the AND gate chip is connected with the output terminal of the IGBT control comparator in the electromagnetic heating system, and the output terminal of the AND gate chip is connected with the input terminal of the IGBT drive module in the electromagnetic heating system.
8. An induction cooker, characterized in that the induction cooker comprises the IGBT collector voltage protection device based on the power supply input voltage according to any one of claims 3 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| 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 CN108235481A (en) | 2018-06-29 |
| CN108235481B true CN108235481B (en) | 2021-03-30 |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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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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