CN205179404U - IGBT's overvoltage crowbar among electromagnetic heating device and electromagnetic heating device - Google Patents
IGBT's overvoltage crowbar among electromagnetic heating device and electromagnetic heating device Download PDFInfo
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- CN205179404U CN205179404U CN201520966122.6U CN201520966122U CN205179404U CN 205179404 U CN205179404 U CN 205179404U CN 201520966122 U CN201520966122 U CN 201520966122U CN 205179404 U CN205179404 U CN 205179404U
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Abstract
The utility model discloses a IGBT's overvoltage crowbar among electromagnetic heating device and electromagnetic heating device, wherein, IGBT is in open or turn -off under drive circuit's the drive among the electromagnetic heating device, overvoltage crowbar includes: voltage detection unit, voltage detection unit with IGBT's C extremely links to each other in order to detect IGBT's C pole tension, the overvoltage protection unit, the input of overvoltage protection unit with voltage detection unit's output links to each other, the output of overvoltage protection unit with drive circuit's input links to each other, the overvoltage protection unit is in IGBT is in off state just control signal was opened extremely to output when IGBT's C pole tension was more than or equal to the presupposition voltage threshold value drive circuit so that the drive circuit drive IGBT is open -minded, in order to reduce IGBT's C pole tension reaches the purpose of protecting IGBT, has improved electromagnetic heating device fail safe nature.
Description
Technical field
The utility model relates to electromagnetic heating technique field, particularly the overvoltage crowbar of IGBT and a kind of electromagnetic heater with this overvoltage crowbar in a kind of electromagnetic heater.
Background technology
At present, domestic electromagnetic heating products is in the course of the work because the reasons such as power network fluctuation are easy to cause IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor) to occur the too high phenomenon of C pole tension in turn off process.
But, if IGBT cannot be protected in time after the C pole tension of IGBT exceeds standard, easily cause IGBT over-voltage breakdown, domestic electromagnetic heating products damaged.
Utility model content
The utility model is intended to solve one of technical problem in above-mentioned technology at least to a certain extent.For this reason; an object of the present utility model is the overvoltage crowbar proposing IGBT in a kind of electromagnetic heater; open by control IGBT the C pole tension discharging IGBT when IGBT is in off state and the C pole tension of IGBT is too high; thus reduce the C pole tension of IGBT, reach the object of protection IGBT.
Another object of the present utility model is to propose a kind of electromagnetic heater.
For achieving the above object, the utility model proposes the overvoltage crowbar of IGBT in a kind of electromagnetic heater, wherein, carry out opening or turning off under the driving of described IGBT drive circuit in described electromagnetic heater, described overvoltage crowbar comprises: voltage detection unit, and described voltage detection unit is extremely connected with the C of described IGBT the C pole tension detecting described IGBT; Overvoltage protecting unit; the input of described Overvoltage protecting unit is connected with the output of described voltage detection unit; the output of described Overvoltage protecting unit is connected with the input of described drive circuit; described Overvoltage protecting unit exports when described IGBT is in off state and the C pole tension of described IGBT is more than or equal to predetermined voltage threshold to open and controls signal to described drive circuit and drive described IGBT open-minded to make described drive circuit, to reduce the C pole tension of described IGBT.
According to the overvoltage crowbar of IGBT in the electromagnetic heater that the utility model proposes; export to open by Overvoltage protecting unit when IGBT is in off state and the C pole tension of IGBT is more than or equal to predetermined voltage threshold and control signal to drive circuit and drive IGBT open-minded to make drive circuit; thus declined to make the C pole tension of IGBT by the C pole tension of release IGBT; reach the object of protection IGBT; avoid IGBT over-voltage breakdown, improve electromagnetic heater security reliability.
Further, when the C electrode drop of described IGBT is low to moderate below described predetermined voltage threshold, described Overvoltage protecting unit output shutoff controls signal to described drive circuit and drives described IGBT to keep off state to make described drive circuit.
Wherein, described Overvoltage protecting unit specifically comprises: the first resistance of series connection and the second resistance, and the first resistance of described series connection and the second resistance are connected to first and preset between power supply and ground, have first node between the first resistance of described series connection and the second resistance; Comparator, the positive input terminal of described comparator is connected with the output of described voltage detection unit, and the negative input end of described comparator is connected with described first node, and the output of described comparator is connected with the input of described drive circuit.
Described voltage detection unit specifically comprises: the 3rd resistance of series connection and the 4th resistance, one end of described 3rd resistance is extremely connected with the C of described IGBT, the other end of described 3rd resistance is connected with one end of described 4th resistance, the other end ground connection of described 4th resistance, have Section Point between the other end of described 3rd resistance and one end of described 4th resistance, described Section Point is as the output of described voltage detection unit.
Particularly, resonant capacitance in described IGBT and described electromagnetic heater and resonance coil form resonant circuit, described resonant capacitance is extremely connected with the C of described IGBT with after resonance coils from parallel connection of coils, and the G pole of described IGBT is connected with described drive circuit, the E pole ground connection of described IGBT.
Particularly, described electromagnetic heater also comprises rectifier bridge stack and filter circuit, the input of described rectifier bridge stack is connected with AC mains, the output of described rectifier bridge stack is connected with the input of described filter circuit, and the output of described filter circuit is connected with resonance coil with the resonant capacitance of parallel connection.
Wherein, described filter circuit specifically comprises: the first electric capacity, and described first Capacitance parallel connection is between the output of described rectifier bridge stack; First inductance, one end of described first inductance is connected with one end of described first electric capacity, and the other end of described first inductance is connected with resonance coil with the resonant capacitance of described parallel connection respectively; 5th resistance, one end of described 5th resistance is connected with the other end of described first electric capacity; Second electric capacity, one end of described second electric capacity is connected with the other end of described first inductance, ground connection after the other end of described second electric capacity is connected with the other end of described 5th resistance.
Particularly, described drive circuit specifically comprises: the first triode, the grounded emitter of described first triode, and the collector electrode of described first triode is preset power supply by the 6th resistance and second and is connected; 7th resistance of series connection and the 8th resistance, 7th resistance of described series connection and the 8th resistance are connected to described second and preset between power supply and the base stage of described first triode, have the 3rd node between 7th resistance of described series connection and the 8th resistance, described 3rd node is as the input of described drive circuit; Second triode, the base stage of described second triode is connected with the collector electrode of described first triode, the emitter of described second triode is extremely connected with the G of described IGBT by the 9th resistance, and the collector electrode of described second triode is preset power supply by the tenth resistance and described second and is connected; 3rd triode, the emitter of described 3rd triode is connected with the emitter of described second triode by the 11 resistance, the base stage of described 3rd triode is connected with the base stage of described second triode with the collector electrode of described first triode respectively, the grounded collector of described 3rd triode.
Further, described drive circuit also comprises: voltage stabilizing didoe, the plus earth of described voltage stabilizing didoe, and the negative electrode of described voltage stabilizing didoe is extremely connected with the G of described IGBT; 12 resistance, described 12 resistance is in parallel with described voltage stabilizing didoe.
In addition, the utility model also proposed a kind of electromagnetic heater, and it comprises the overvoltage crowbar of IGBT in above-mentioned electromagnetic heater.
The electromagnetic heater that the utility model proposes; by above-mentioned overvoltage crowbar; off state can be at IGBT and the C pole tension of IGBT is more than or equal to predetermined voltage threshold time drive IGBT open-minded by controlling drive circuit; thus declined to make the C pole tension of IGBT by the C pole tension of release IGBT; reach the object of protection IGBT; avoid IGBT over-voltage breakdown, security reliability obtains and greatly improves.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the overvoltage crowbar of IGBT in the electromagnetic heater according to the utility model embodiment; And
Fig. 2 is the block diagram of the electromagnetic heater according to the utility model embodiment.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Describe the overvoltage crowbar of IGBT in the electromagnetic heater proposed according to the utility model embodiment with reference to the accompanying drawings and there is the electromagnetic heater of this overvoltage crowbar.
Fig. 1 is the circuit diagram of the overvoltage crowbar of IGBT in the electromagnetic heater according to the utility model embodiment.As shown in Figure 1; resonant capacitance C0 in IGBT and electromagnetic heater and resonance coil L0 forms resonant circuit 20; and carry out opening or turning off under the driving of IGBT drive circuit 30 in electromagnetic heater, in this electromagnetic heater, the overvoltage crowbar 10 of IGBT comprises voltage detection unit 101 and Overvoltage protecting unit 102.
Wherein, voltage detection unit 101 and the C of IGBT are extremely connected the C pole tension to detect IGBT, the input of Overvoltage protecting unit 102 is connected with the output of voltage detection unit 101, the output of Overvoltage protecting unit 102 is connected with the input of drive circuit 30, Overvoltage protecting unit 102 exports when IGBT is in off state and the C pole tension of IGBT is more than or equal to predetermined voltage threshold and when the C pole tension of IGBT is too high to open and controls signal to drive circuit 30 and drive described IGBT open-minded to make drive circuit 30, thus by release IGBT C pole tension to reduce the C pole tension of IGBT.
Further, when the C electrode drop of described IGBT is low to moderate below described predetermined voltage threshold, Overvoltage protecting unit 102 export shutoff control signal to drive circuit 30 with make drive circuit 30 drive described IGBT keep off state.
As shown in Figure 1, the input of drive circuit 30 is also connected with the controller 40 such as MCU in electromagnetic heater, when electromagnetic heater normally works, controller 40 such as MCU exports and opens control signal and turn off control signal such as low and high level to drive circuit 30, to drive turning on and off of IGBT by drive circuit 30.
In embodiment of the present utility model; when IGBT is in off state; if detect that the C pole tension of IGBT is too high be namely more than or equal to predetermined voltage threshold; Overvoltage protecting unit 102 outputs open control signal such as high level to drive circuit 30; IGBT is driven to open to discharge the C pole tension of IGBT by drive circuit 30; and when the C pole tension of IGBT is reduced to below predetermined voltage threshold; Overvoltage protecting unit 102 exports and turns off control signal such as low level to drive circuit 30, drives IGBT to keep turning off by drive circuit 30.That is, when IGBT is in normal turn-off state, what controller 40 such as MCU exported is turn off control signal such as low level, Overvoltage protecting unit 102 exports according to the C pole tension height of IGBT and opens control signal or turn off control signal such as low and high level, namely Overvoltage protecting unit 102 export high level and MCU output low level time, the high level exported with Overvoltage protecting unit 102 is effective, and drive circuit 30 drives IGBT open-minded; When IGBT is in normal opening state; what controller 40 such as MCU exported is open control signal such as high level; now the C pole tension of IGBT usually can not be too high; what therefore Overvoltage protecting unit 102 exported is turn off control signal such as low level; namely when Overvoltage protecting unit 102 output low level and MCU export high level; the high level exported with MCU is effective, and drive circuit 30 drives IGBT normally open-minded.
According to an embodiment of the present utility model, as shown in Figure 1, Overvoltage protecting unit 102 specifically comprises: the first resistance R1 of series connection and the second resistance R2 and comparator Comp1, first resistance R1 of series connection and the second resistance R2 is connected between the first power supply presetting power supply such as 5V and ground, between first resistance R1 of series connection and the second resistance R2, there is first node J1, the positive input terminal of comparator Comp1 is connected with the output of voltage detection unit 101, the negative input end of comparator Comp1 is connected with first node J1, the output of comparator Comp1 is connected with the input of drive circuit 30.
That is; when IGBT is in off state and voltage detection unit 101 detects that the C pole tension of IGBT is too high; comparator Comp1 exports high level to drive circuit 30; control drive circuit 30 and export high level to make IGBT open-minded; declined to make the C pole tension of IGBT by the C pole tension discharging IGBT; avoid IGBT over-voltage breakdown, thus reach the object of protection IGBT.
According to an embodiment of the present utility model, as shown in Figure 1, voltage detection unit 101 specifically comprises: the 3rd resistance R3 of series connection and the 4th resistance R4, one end of 3rd resistance R3 is extremely connected with the C of IGBT, the other end of the 3rd resistance R3 is connected with one end of the 4th resistance R4, the other end ground connection of the 4th resistance R4, have Section Point J2 between the other end of the 3rd resistance R3 and one end of the 4th resistance R4, Section Point J2 is as the output of voltage detection unit 101.
Further, as shown in Figure 1, the resonant capacitance C0 in IGBT and electromagnetic heater and resonance coil L0 forms resonant circuit 20, and resonant capacitance C0 is extremely connected with the C of IGBT with after resonance coil L0 parallel connection, and the G pole of IGBT is connected with drive circuit 30, the E pole ground connection of IGBT.Further, the control signal output of controller 40 such as MCU is also connected with the input of drive circuit 30.
Particularly, as shown in Figure 1, electromagnetic heater also comprises rectifier bridge stack 60 and filter circuit 50, the input of rectifier bridge stack 60 is connected with AC mains, the output of rectifier bridge stack 60 is connected with the input of filter circuit 50, and the output of filter circuit 50 is connected with resonance coil L0 with the resonant capacitance C0 of parallel connection.
Wherein, filter circuit 50 specifically comprises: the first electric capacity C1, the first inductance L 1, the 5th resistance R5 and the second electric capacity C2, first electric capacity C1 is connected in parallel between the output of rectifier bridge stack 60, one end of first inductance L 1 is connected with one end of the first electric capacity C1, the other end of the first inductance L 1 is connected with resonance coil L0 with the resonant capacitance C0 of parallel connection respectively, one end of 5th resistance R5 is connected with the other end of the first electric capacity C1, one end of second electric capacity C2 is connected with the other end of the first inductance L 1, ground connection after the other end of the second electric capacity C2 is connected with the other end of the 5th resistance R5.
According to an embodiment of the present utility model, as shown in Figure 1, drive circuit 30 specifically comprises: the 7th resistance R7 of the first triode Q1, series connection and the 8th resistance R8, the second triode Q2, the 3rd triode Q3.Wherein, the grounded emitter (ground of single-chip microcomputer) of the first triode Q1, the collector electrode of the first triode Q1 is connected with the second power supply presetting power supply such as 18V by the 6th resistance R6,7th resistance R7 of series connection and the 8th resistance R8 is connected to second and presets between power supply and the base stage of the first triode Q1, have the 3rd node J3 between 7th resistance R7 of described series connection and the 8th resistance R8, the 3rd node J3 is as the input of drive circuit 30; The base stage of the second triode Q2 is connected with the collector electrode of the first triode Q1, the emitter of the second triode Q2 is extremely connected by the G of the 9th resistance R9 and IGBT, the collector electrode of the second triode Q2 is preset power supply by the tenth resistance R10 and second and is connected, the emitter of the 3rd triode Q3 is connected with the emitter of the second triode Q2 by the 11 resistance R11, the base stage of the 3rd triode Q3 is connected with the base stage of the second triode Q2 with the collector electrode of the first triode Q1 respectively, the grounded collector of the 3rd triode Q3.
Further, as shown in Figure 1, drive circuit 30 also comprises voltage stabilizing didoe ZD1 and the 12 resistance R12, the plus earth of voltage stabilizing didoe ZD1, and the negative electrode of voltage stabilizing didoe ZD1 is extremely connected with the G of described IGBT, and the 12 resistance R12 is in parallel with voltage stabilizing didoe ZD1.And, drive circuit 30 also comprise electrochemical capacitor EC1 and the 3rd electric capacity C3, electrochemical capacitor EC1 and the 3rd electric capacity C3 be connected in parallel on second preset between power supply and ground.
According to the overvoltage crowbar of IGBT in the electromagnetic heater of the utility model embodiment; export to open by Overvoltage protecting unit when IGBT is in off state and the C pole tension of IGBT is more than or equal to predetermined voltage threshold and control signal to drive circuit and drive IGBT open-minded to make drive circuit; thus declined to make the C pole tension of IGBT by the C pole tension of release IGBT; reach the object of protection IGBT; avoid IGBT over-voltage breakdown, improve electromagnetic heater security reliability.
In addition, as shown in Figure 2, embodiment of the present utility model also proposed a kind of electromagnetic heater 1000, and it comprises the overvoltage crowbar 10 of IGBT in above-mentioned electromagnetic heater.
Wherein, electromagnetic heater can be electromagnetic oven, electromagnetic rice cooker or prevention electromagnetic pressure cooker.
The electromagnetic heater that the utility model embodiment proposes; by above-mentioned overvoltage crowbar; off state can be at IGBT and the C pole tension of IGBT is more than or equal to predetermined voltage threshold time drive IGBT open-minded by controlling drive circuit; thus declined to make the C pole tension of IGBT by the C pole tension of release IGBT; reach the object of protection IGBT; avoid IGBT over-voltage breakdown, security reliability obtains and greatly improves.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In description of the present utility model, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment, revises, replace and modification in scope of the present utility model.
Claims (10)
1. an overvoltage crowbar of IGBT in electromagnetic heater, it is characterized in that, carry out opening or turning off under the driving of described IGBT drive circuit in described electromagnetic heater, described overvoltage crowbar comprises:
Voltage detection unit, described voltage detection unit is extremely connected with the C of described IGBT the C pole tension detecting described IGBT;
Overvoltage protecting unit; the input of described Overvoltage protecting unit is connected with the output of described voltage detection unit; the output of described Overvoltage protecting unit is connected with the input of described drive circuit; described Overvoltage protecting unit exports when described IGBT is in off state and the C pole tension of described IGBT is more than or equal to predetermined voltage threshold to open and controls signal to described drive circuit and drive described IGBT open-minded to make described drive circuit, to reduce the C pole tension of described IGBT.
2. the overvoltage crowbar of IGBT in electromagnetic heater according to claim 1; it is characterized in that; when the C electrode drop of described IGBT is low to moderate below described predetermined voltage threshold, described Overvoltage protecting unit output shutoff controls signal to described drive circuit and drives described IGBT to keep off state to make described drive circuit.
3. the overvoltage crowbar of IGBT in electromagnetic heater according to claim 1 and 2, it is characterized in that, described Overvoltage protecting unit specifically comprises:
First resistance of series connection and the second resistance, the first resistance of described series connection and the second resistance are connected to first and preset between power supply and ground, have first node between the first resistance of described series connection and the second resistance;
Comparator, the positive input terminal of described comparator is connected with the output of described voltage detection unit, and the negative input end of described comparator is connected with described first node, and the output of described comparator is connected with the input of described drive circuit.
4. the overvoltage crowbar of IGBT in electromagnetic heater according to claim 3, it is characterized in that, described voltage detection unit specifically comprises:
3rd resistance of series connection and the 4th resistance, one end of described 3rd resistance is extremely connected with the C of described IGBT, the other end of described 3rd resistance is connected with one end of described 4th resistance, the other end ground connection of described 4th resistance, have Section Point between the other end of described 3rd resistance and one end of described 4th resistance, described Section Point is as the output of described voltage detection unit.
5. the overvoltage crowbar of IGBT in electromagnetic heater according to claim 1; it is characterized in that; resonant capacitance in described IGBT and described electromagnetic heater and resonance coil form resonant circuit; described resonant capacitance is extremely connected with the C of described IGBT with after resonance coils from parallel connection of coils; the G pole of described IGBT is connected with described drive circuit, the E pole ground connection of described IGBT.
6. the overvoltage crowbar of IGBT in electromagnetic heater according to claim 5; it is characterized in that; described electromagnetic heater also comprises rectifier bridge stack and filter circuit; the input of described rectifier bridge stack is connected with AC mains; the output of described rectifier bridge stack is connected with the input of described filter circuit, and the output of described filter circuit is connected with resonance coil with the resonant capacitance of parallel connection.
7. the overvoltage crowbar of IGBT in electromagnetic heater according to claim 6, it is characterized in that, described filter circuit specifically comprises:
First electric capacity, described first Capacitance parallel connection is between the output of described rectifier bridge stack;
First inductance, one end of described first inductance is connected with one end of described first electric capacity, and the other end of described first inductance is connected with resonance coil with the resonant capacitance of described parallel connection respectively;
5th resistance, one end of described 5th resistance is connected with the other end of described first electric capacity;
Second electric capacity, one end of described second electric capacity is connected with the other end of described first inductance, ground connection after the other end of described second electric capacity is connected with the other end of described 5th resistance.
8. the overvoltage crowbar of IGBT in electromagnetic heater according to claim 1, it is characterized in that, described drive circuit specifically comprises:
First triode, the grounded emitter of described first triode, the collector electrode of described first triode is preset power supply by the 6th resistance and second and is connected;
7th resistance of series connection and the 8th resistance, 7th resistance of described series connection and the 8th resistance are connected to described second and preset between power supply and the base stage of described first triode, have the 3rd node between 7th resistance of described series connection and the 8th resistance, described 3rd node is as the input of described drive circuit;
Second triode, the base stage of described second triode is connected with the collector electrode of described first triode, the emitter of described second triode is extremely connected with the G of described IGBT by the 9th resistance, and the collector electrode of described second triode is preset power supply by the tenth resistance and described second and is connected;
3rd triode, the emitter of described 3rd triode is connected with the emitter of described second triode by the 11 resistance, the base stage of described 3rd triode is connected with the base stage of described second triode with the collector electrode of described first triode respectively, the grounded collector of described 3rd triode.
9. the overvoltage crowbar of IGBT in electromagnetic heater according to claim 8, it is characterized in that, described drive circuit also comprises:
Voltage stabilizing didoe, the plus earth of described voltage stabilizing didoe, the negative electrode of described voltage stabilizing didoe is extremely connected with the G of described IGBT;
12 resistance, described 12 resistance is in parallel with described voltage stabilizing didoe.
10. an electromagnetic heater, is characterized in that, comprises the overvoltage crowbar of IGBT in the electromagnetic heater according to any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520966122.6U CN205179404U (en) | 2015-11-26 | 2015-11-26 | IGBT's overvoltage crowbar among electromagnetic heating device and electromagnetic heating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520966122.6U CN205179404U (en) | 2015-11-26 | 2015-11-26 | IGBT's overvoltage crowbar among electromagnetic heating device and electromagnetic heating device |
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| CN205179404U true CN205179404U (en) | 2016-04-20 |
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| CN201520966122.6U Expired - Fee Related CN205179404U (en) | 2015-11-26 | 2015-11-26 | IGBT's overvoltage crowbar among electromagnetic heating device and electromagnetic heating device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106793223A (en) * | 2017-03-31 | 2017-05-31 | 杨作峰 | A kind of single tube drives electromagnetic heating circuit |
| CN107404308A (en) * | 2016-05-18 | 2017-11-28 | 佛山市顺德区美的电热电器制造有限公司 | The protection circuit of switching tube and there is its Electromagnetic Heating cooking equipment |
| CN107528289A (en) * | 2016-06-20 | 2017-12-29 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its protection device |
| CN107801263A (en) * | 2016-09-07 | 2018-03-13 | 佛山市顺德区美的电热电器制造有限公司 | A kind of protection circuit of switching tube and guard method |
| CN108631269A (en) * | 2017-03-20 | 2018-10-09 | 万国半导体(开曼)股份有限公司 | Smart Power Module for resonance inverter |
| CN108811215A (en) * | 2017-05-04 | 2018-11-13 | 佛山市顺德区美的电热电器制造有限公司 | The protective device of electromagnetic rice cooker, electromagnetic heating system and its power switch tube |
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2015
- 2015-11-26 CN CN201520966122.6U patent/CN205179404U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404308A (en) * | 2016-05-18 | 2017-11-28 | 佛山市顺德区美的电热电器制造有限公司 | The protection circuit of switching tube and there is its Electromagnetic Heating cooking equipment |
| CN107404308B (en) * | 2016-05-18 | 2020-11-20 | 佛山市顺德区美的电热电器制造有限公司 | Protection circuit of switch tube and electromagnetic heating cooking equipment with same |
| CN107528289A (en) * | 2016-06-20 | 2017-12-29 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its protection device |
| CN107528289B (en) * | 2016-06-20 | 2020-04-03 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and protection device thereof |
| CN107801263A (en) * | 2016-09-07 | 2018-03-13 | 佛山市顺德区美的电热电器制造有限公司 | A kind of protection circuit of switching tube and guard method |
| CN107801263B (en) * | 2016-09-07 | 2021-04-13 | 佛山市顺德区美的电热电器制造有限公司 | Protection circuit and protection method of switching tube |
| CN108631269A (en) * | 2017-03-20 | 2018-10-09 | 万国半导体(开曼)股份有限公司 | Smart Power Module for resonance inverter |
| CN108631269B (en) * | 2017-03-20 | 2020-12-08 | 万国半导体(开曼)股份有限公司 | Intelligent power module for resonant inverter |
| CN106793223A (en) * | 2017-03-31 | 2017-05-31 | 杨作峰 | A kind of single tube drives electromagnetic heating circuit |
| CN108811215A (en) * | 2017-05-04 | 2018-11-13 | 佛山市顺德区美的电热电器制造有限公司 | The protective device of electromagnetic rice cooker, electromagnetic heating system and its power switch tube |
| CN108811215B (en) * | 2017-05-04 | 2021-04-20 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic rice cooker, electromagnetic heating system and protection device of power switch tube of electromagnetic heating system |
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