CN204810577U - Electromagnetic heating system and current detection and protection controlling means thereof - Google Patents
Electromagnetic heating system and current detection and protection controlling means thereof Download PDFInfo
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- CN204810577U CN204810577U CN201520565553.1U CN201520565553U CN204810577U CN 204810577 U CN204810577 U CN 204810577U CN 201520565553 U CN201520565553 U CN 201520565553U CN 204810577 U CN204810577 U CN 204810577U
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Abstract
The utility model discloses an electromagnetic heating system's current detection and protection controlling means, include: convert the electric main into second two galvanic rectifier circuit, zero cross detection circuit, zero cross detection circuit detect the zero crossing of electric main according to the second direct current, current detection circuit for detect IGBT's electric current, the controller, the maximum current of controller in the zero crossing of electric main begins to acquire every cycle of switching on of IGBT to when maximum current in IGBT's the cycle of switching on at present is greater than electric current protection threshold value, turn -off with control IGBT through control drive circuit. This current detection and protection controlling means can the furthest reduction cause the damage because of the cumlative effect to IGBT. The utility model also discloses an electromagnetic heating system.
Description
Technical field
The utility model relates to electromagnetic heating system, particularly a kind of current detecting of electromagnetic heating system and protecting control device and a kind of electromagnetic heating system.
Background technology
Usually, the current detection scheme of electromagnetic heating system has three kinds: (1) detects electric main by current transformer; (2) rectifier bridge stack ground line current detects; (3) the E electrode current of IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor) detects.
In above-mentioned three kinds of detection schemes, if adopt current transformer to detect electric main, then cost compare is high, and cannot the pulse current of E pole of Real-time Obtaining IGBT, thus cannot provide real-time guard.If adopt rectifier bridge stack ground line current detection scheme, equally cannot the electric current of Real-time Obtaining IGBT, can not real-time guard be provided.And the E electrode current detection scheme of IGBT in correlation technique, as shown in Figure 1, although can the electric current of Real-time Obtaining IGBT, but need built-in discharge circuit to amplify current signal, and main control unit is sent to after RC filtering, required device is many, and circuit is complicated.
Therefore, need to improve the current detection scheme of electromagnetic heating system.
Utility model content
The utility model is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, an object of the present utility model is to propose a kind of can minimizing to greatest extent because cumulative effect to cause current detecting and the protecting control device of the electromagnetic heating system of damage to IGBT.
Another object of the present utility model is to propose a kind of electromagnetic heating system.
For achieving the above object, the utility model proposes a kind of current detecting and protecting control device of electromagnetic heating system on the one hand, described electromagnetic heating system comprise be made up of IGBT resonant circuit, electric main is converted to the first direct current to supply the first rectification circuit of described resonant circuit, to drive the drive circuit of described IGBT, described current detecting and protecting control device comprise: described electric main is converted to the second galvanic second rectification circuit; Zero cross detection circuit, described zero cross detection circuit is connected with described second rectification circuit, and described zero cross detection circuit detects the zero crossing of described electric main according to described second direct current; Current detection circuit, described current detection circuit is extremely connected with the E of described IGBT, and described current detection circuit is for detecting the electric current of described IGBT; Controller; described controller is connected with described drive circuit with described zero cross detection circuit, described current detection circuit respectively; described controller starts to obtain the maximum current in each turn-on cycle of described IGBT at the zero crossing of described electric main; and the maximum current in the current turn-on cycle of described IGBT is when being greater than current protection threshold value, described controller turns off to control described IGBT by controlling described drive circuit.
According to current detecting and the protecting control device of the electromagnetic heating system of the utility model embodiment, by the second rectification circuit, electric main is converted to the second direct current, zero cross detection circuit detects the zero crossing of electric main according to the second direct current, controller begins through the maximum current in each turn-on cycle of current detection circuit acquisition IGBT at the zero crossing of electric main, and the maximum current in the current turn-on cycle of IGBT is when being greater than current protection threshold value, turn off with control IGBT by controlling drive circuit, thus the IGBT damage reduced to greatest extent because cumulative effect causes, and it is simple to have structure, reliability is high, low cost and other advantages.
Particularly; the current detecting of above-mentioned electromagnetic heating system and protecting control device; also comprise alarm; described alarm is connected with described controller; wherein; when maximum current in the current turn-on cycle of described IGBT is greater than current protection threshold value, described controller also controls described alarm and sends information warning, and controls the shutdown of described electromagnetic heating system.
Particularly, when obtain time that the number of times of described maximum current is greater than preset times or obtains described maximum current reach Preset Time time, if the maximum current in each turn-on cycle of described IGBT is all less than or equal to described current protection threshold value, described controller the maximum current in each turn-on cycle obtained is carried out cumulative after be averaged to obtain average current, and the power of described electromagnetic heating system is calculated according to described average current, and the power of described electromagnetic heating system and target power are compared to regulate the ON time of described IGBT in next turn-on cycle.
Particularly, if the power of described electromagnetic heating system is greater than described target power, described controller is by controlling described drive circuit to reduce the ON time of described IGBT in next turn-on cycle; If the power of described electromagnetic heating system is less than described target power, described controller is by controlling described drive circuit to increase the ON time of described IGBT in next turn-on cycle.
Preferably, described Preset Time is a half wave cycles of described electric main.
Particularly, described current detection circuit specifically comprises: sampling resistor, and one end of described sampling resistor is extremely connected with the E of described IGBT, the other end ground connection of described sampling resistor; Filter resistance, one end of described filter resistance is connected with one end of described sampling resistor with the E pole of described IGBT respectively; Filter capacitor, one end of described filter capacitor is connected with the other end of described filter resistance, the other end ground connection of described filter capacitor, have first node between one end of described filter capacitor and the other end of described filter resistance, described first node is connected with described controller.
For achieving the above object, the utility model proposes a kind of electromagnetic heating system on the other hand, and it comprises current detecting and the protecting control device of above-mentioned electromagnetic heating system.
This electromagnetic heating system, by the current detecting of above-mentioned electromagnetic heating system and protecting control device, can reduce the IGBT caused because of cumulative effect to greatest extent and damage, and has that structure is simple, reliability is high, low cost and other advantages.
Accompanying drawing explanation
Fig. 1 is the current detection circuit figure of IGBT in traditional electromagnetic heating system.
Fig. 2 is the block diagram of current detecting according to the electromagnetic heating system of the utility model embodiment and protecting control device.
Fig. 3 is the circuit diagram of current detecting according to the electromagnetic heating system of the utility model embodiment and protecting control device.
Fig. 4 is the workflow diagram of current detecting according to the electromagnetic heating system of the utility model embodiment and protecting control device.
Fig. 5 a-Fig. 5 f is the current waveform figure of the IGBT according to the utility model embodiment.
Fig. 6 is the flow chart of current detecting according to the electromagnetic heating system of the utility model embodiment and protecting control method.
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.
The current detecting of electromagnetic heating system and protecting control device and electromagnetic heating system that the utility model embodiment proposes are described with reference to the accompanying drawings.
Fig. 2 is the block diagram of current detecting according to the electromagnetic heating system of the utility model embodiment and protecting control device; wherein, electromagnetic heating system comprise be made up of IGBT resonant circuit 10, electric main is converted to the first direct current to supply the first rectification circuit 20 of resonant circuit 10, to drive the drive circuit 30 of IGBT.As shown in Figure 2, the current detecting of electromagnetic heating system and protecting control device comprise the second rectification circuit 40, zero cross detection circuit 50, current detection circuit 60 and controller 70.
Wherein, electric main is converted to the second direct current by the second rectification circuit 40, zero cross detection circuit 50 is connected with the second rectification circuit 40, zero cross detection circuit 50 detects the zero crossing of electric main according to the second direct current, current detection circuit 60 is extremely connected with the E of IGBT, current detection circuit 60 is for detecting the electric current of IGBT, controller 70 respectively with zero cross detection circuit 50, current detection circuit 60 is connected with drive circuit 30, controller 70 starts to obtain the maximum current in each turn-on cycle of IGBT at the zero crossing of electric main, and the maximum current in the current turn-on cycle of IGBT is when being greater than current protection threshold value, controller 70 turns off with control IGBT by controlling drive circuit 30.
In embodiment of the present utility model, current protection threshold value can be demarcated according to actual conditions.
According to an embodiment of the present utility model; the current detecting of above-mentioned electromagnetic heating system and protecting control device also comprise alarm (not specifically illustrating in figure); alarm is connected with controller 70; wherein; maximum current in the current turn-on cycle of IGBT is greater than current protection threshold value Time Controller 70 and also controls alarm and send information warning, and controls electromagnetic heating system shutdown.
Briefly, zero cross detection circuit 50 detects in real time electric main whether zero crossing, and when zero cross detection circuit 50 detects electric main zero crossing, current detection circuit 60 starts to obtain the maximum current in each turn-on cycle of IGBT.If the maximum current in the current turn-on cycle of the IGBT obtained is greater than current protection threshold value; then controller 70 turns off IGBT by controlling drive circuit 30; thus the damage reduced to greatest extent because cumulative effect causes IGBT; simultaneously; controller 70 controls alarm and sends information warning; and control electromagnetic heating system shutdown to stop heating, thus overcurrent protection is carried out to electromagnetic heating system.
According to an embodiment of the present utility model; when the time that the number of times obtaining maximum current is greater than preset times or acquisition maximum current reaches Preset Time; if the maximum current in each turn-on cycle of IGBT is all less than or equal to current protection threshold value; controller 70 maximum current in each turn-on cycle obtained is carried out cumulative after be averaged to obtain average current; and calculate the power of electromagnetic heating system according to average current, and the power of electromagnetic heating system and target power are compared regulate the ON time of IGBT in next turn-on cycle.
Wherein, preset times and Preset Time can be demarcated according to actual conditions, and preferably, Preset Time can be a half wave cycles of electric main.
According to an embodiment of the present utility model, if the power of electromagnetic heating system is greater than target power, controller 70 is by controlling drive circuit 30 to reduce the ON time of IGBT in next turn-on cycle; If the power of electromagnetic heating system is less than target power, controller 70 is by controlling drive circuit 30 to increase the ON time of IGBT in next turn-on cycle.
Wherein, target power can be demarcated according to actual conditions.
Specifically, when zero cross detection circuit 50 detects electric main zero crossing, current detection circuit 60 starts to obtain the maximum current in each turn-on cycle of IGBT.If the maximum current in the current turn-on cycle of the IGBT that current detection circuit 60 obtains is less than or equal to current protection threshold value, then controller 70 records this maximum current, and current detection circuit 60 continues to obtain the maximum current in next turn-on cycle of IGBT.When the time that current detection circuit 60 obtains maximum current be greater than Preset Time be greater than preset times as electric main half wave cycles or the number of times that obtains maximum current time, controller 70 calculates in Preset Time or the mean value of maximum current of preset times and average current, and according to following formula (1) calculating current effective value:
Y＝A+BX(1)
Wherein, Y is current effective value, A and B is coefficient, and X is average current.
Then the current effective value of calculating is multiplied by the power that voltage effective value obtains electromagnetic heating system by controller 70, and the power of electromagnetic heating system and target power is compared.If the power of the electromagnetic heating system calculated is greater than target power, then controller 70 is by controlling drive circuit 30 to reduce the ON time of IGBT in next turn-on cycle; If the power of the electromagnetic heating system calculated is less than target power, then controller 70 is by controlling drive circuit 30 to increase the ON time of IGBT in next turn-on cycle, thus the power adjustments realized electromagnetic heating system, ensure that electromagnetic heating system is according to target power stable operation.
According to an embodiment of the present utility model, as shown in Figure 3, current detection circuit 60 specifically comprises sampling resistor RK1, filter resistance R1 and filter capacitor C1, wherein, one end of sampling resistor RK1 is extremely connected with the E of IGBT, the other end ground connection GND of sampling resistor RK1, one end of filter resistance R1 is connected with one end of sampling resistor RK1 with the E pole of IGBT respectively, one end of filter capacitor C1 is connected with the other end of filter resistance RK1, the other end ground connection GND of filter capacitor C1, between one end of filter capacitor C1 and the other end of filter resistance R1, there is first node J1, first node J1 is connected with controller 70.This current detection circuit can in real time and the electric current of Obtaining Accurate IGBT, and circuit structure is simple, Reliability comparotive is high, and is conducive to the current detecting of electromagnetic heating system and the integrated of protecting control device and reduces costs.
In addition, other circuit structure shown in Fig. 3 is just not described in detail here.Below by Fig. 4, the current detecting of electromagnetic heating system and the course of work of protecting control device are described, specifically comprise the following steps:
S101, judges electric main whether zero crossing.If so, step S102 is performed; If not, return step S101, continue to judge.
S102, initialization electric current reads parameter, and the maximum current read functions in the turn-on cycle of enable IGBT.
S103, reads the maximum current in the current turn-on cycle of IGBT.As shown in Figure 5 a, start to obtain the maximum current in each turn-on cycle of IGBT at the zero crossing place of electric main.It should be noted that, Fig. 5 b-Fig. 5 f is the partial enlarged drawing of the current waveform figure to the IGBT shown in Fig. 5 a, can have a clear understanding of the current waveform in the current turn-on cycle of IGBT.
S104, judges whether the maximum current in the current turn-on cycle of IGBT is less than current protection threshold value.If so, step S105 is performed; If not, step S108 is performed.
S105, judges whether the half wave cycles reaching preset times or reach electric main.If so, step S106 is performed; If not, return step S103, continue to read.
S106, enters the process of current conversion function, calculates the power of average current and electromagnetic heating system, and according to the ON time in next turn-on cycle of power control IGBT of electromagnetic heating system.
S107, judges whether shutdown.If so, step S108 is performed; If not, return step S101, continue to judge.
S108, shutdown.
In sum, according to current detecting and the protecting control device of the electromagnetic heating system of the utility model embodiment, by the second rectification circuit, electric main is converted to the second direct current, zero cross detection circuit detects the zero crossing of electric main according to the second direct current, controller begins through the maximum current in each turn-on cycle of current detection circuit acquisition IGBT at the zero crossing of electric main, and the maximum current in the current turn-on cycle of IGBT is when being greater than current protection threshold value, turn off with control IGBT by controlling drive circuit, thus the IGBT damage reduced to greatest extent because cumulative effect causes, and it is simple to have structure, reliability is high, low cost and other advantages.
In addition, embodiment of the present utility model also proposed a kind of electromagnetic heating system, and it comprises current detecting and the protecting control device of above-mentioned electromagnetic heating system.
This electromagnetic heating system, by the current detecting of above-mentioned electromagnetic heating system and protecting control device, can reduce the IGBT caused because of cumulative effect to greatest extent and damage, and has that structure is simple, reliability is high, low cost and other advantages.
Fig. 6 is the flow chart of current detecting according to the electromagnetic heating system of the utility model embodiment and protecting control method; wherein, electromagnetic heating system comprise be made up of IGBT resonant circuit, electric main is converted to the first direct current to supply the first rectification circuit of resonant circuit, to drive the drive circuit of IGBT.As shown in Figure 6, the current detecting of this electromagnetic heating system and protecting control method comprise the following steps:
S1, detects the electric current of IGBT.
S2, detects the zero crossing of electric main, and starts to obtain the maximum current in each turn-on cycle of IGBT at the zero crossing of electric main.As shown in Figure 5 a, start to obtain the maximum current in each turn-on cycle of IGBT at the zero crossing place of electric main.
S3, when the maximum current in the current turn-on cycle of IGBT is greater than current protection threshold value, turns off with control IGBT by controlling drive circuit.
According to an embodiment of the present utility model, when the maximum current in the current turn-on cycle of IGBT is greater than current protection threshold value, also send information warning, and control electromagnetic heating system shutdown.
Briefly, detecting in real time electric main whether zero crossing, when electric main zero crossing being detected, starting to obtain the maximum current in each turn-on cycle of IGBT.If the maximum current in the current turn-on cycle of the IGBT obtained is greater than current protection threshold value; then turn off IGBT by controlling drive circuit; send information warning simultaneously, and control electromagnetic heating system shutdown to stop heating, thus overcurrent protection is carried out to electromagnetic heating system.
According to an embodiment of the present utility model; when the time that the number of times obtaining maximum current is greater than preset times or acquisition maximum current reaches Preset Time; if the maximum current in each turn-on cycle of IGBT is all less than or equal to current protection threshold value; maximum current in each turn-on cycle obtained is carried out cumulative after be averaged to obtain average current; and calculate the power of electromagnetic heating system according to average current, and the power of electromagnetic heating system and target power are compared regulate the ON time of IGBT in next turn-on cycle.
According to an embodiment of the present utility model, if the power of electromagnetic heating system is greater than target power, by controlling drive circuit to reduce the ON time of IGBT in next turn-on cycle; If the power of electromagnetic heating system is less than target power, by controlling drive circuit to increase the ON time of IGBT in next turn-on cycle.
Preferably, Preset Time is a half wave cycles of electric main.
Specifically, when electric main zero crossing being detected, start to obtain the maximum current in each turn-on cycle of IGBT.If the maximum current in the current turn-on cycle of the IGBT obtained is less than or equal to current protection threshold value, then records this maximum current and continue to obtain the maximum current in next turn-on cycle of IGBT.When obtain time of maximum current be greater than Preset Time be greater than preset times as electric main half wave cycles or the number of times that obtains maximum current time, calculate in Preset Time or the mean value of the maximum current of preset times and average current, and according to above-mentioned formula (1) calculating current effective value, then the current effective value of calculating is multiplied by the power that voltage effective value obtains electromagnetic heating system, and the power of electromagnetic heating system and target power are compared.If the power of the electromagnetic heating system calculated is greater than target power, then by controlling drive circuit to reduce the ON time of IGBT in next turn-on cycle; If the power of the electromagnetic heating system calculated is less than target power, then by controlling drive circuit to increase the ON time of IGBT in next turn-on cycle, thus the power adjustments realized electromagnetic heating system, ensure that electromagnetic heating system is according to target power stable operation.
Further, the current detecting of the electromagnetic heating system of one embodiment of the present of invention and the flow chart of protecting control method as shown in Figure 4, are not described in detail here.
According to current detecting and the protecting control method of the electromagnetic heating system of the utility model embodiment; the real-time detection electric current of IGBT and the zero crossing of electric main; and start to obtain the maximum current in each turn-on cycle of IGBT at the zero crossing of electric main; when maximum current in the current turn-on cycle of IGBT is greater than current protection threshold value; turn off with control IGBT by controlling drive circuit; thus reduce the IGBT caused because of cumulative effect to greatest extent and damage, and have that method is simple, high reliability.
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 (7)
1. the current detecting of an electromagnetic heating system and protecting control device; it is characterized in that; described electromagnetic heating system comprise be made up of IGBT resonant circuit, electric main is converted to the first direct current to supply the first rectification circuit of described resonant circuit, to drive the drive circuit of described IGBT, described current detecting and protecting control device comprise:
Described electric main is converted to the second galvanic second rectification circuit;
Zero cross detection circuit, described zero cross detection circuit is connected with described second rectification circuit, and described zero cross detection circuit detects the zero crossing of described electric main according to described second direct current;
Current detection circuit, described current detection circuit is extremely connected with the E of described IGBT, and described current detection circuit is for detecting the electric current of described IGBT;
Controller; described controller is connected with described drive circuit with described zero cross detection circuit, described current detection circuit respectively; described controller starts to obtain the maximum current in each turn-on cycle of described IGBT at the zero crossing of described electric main; and the maximum current in the current turn-on cycle of described IGBT is when being greater than current protection threshold value, described controller turns off to control described IGBT by controlling described drive circuit.
2. the current detecting of electromagnetic heating system as claimed in claim 1 and protecting control device; it is characterized in that; also comprise alarm; described alarm is connected with described controller; wherein; when maximum current in the current turn-on cycle of described IGBT is greater than current protection threshold value, described controller also controls described alarm and sends information warning, and controls the shutdown of described electromagnetic heating system.
3. the current detecting of electromagnetic heating system as claimed in claim 1 and protecting control device, it is characterized in that, when obtain time that the number of times of described maximum current is greater than preset times or obtains described maximum current reach Preset Time time, if the maximum current in each turn-on cycle of described IGBT is all less than or equal to described current protection threshold value, described controller the maximum current in each turn-on cycle obtained is carried out cumulative after be averaged to obtain average current, and the power of described electromagnetic heating system is calculated according to described average current, and the power of described electromagnetic heating system and target power are compared to regulate the ON time of described IGBT in next turn-on cycle.
4. the current detecting of electromagnetic heating system as claimed in claim 3 and protecting control device, is characterized in that,
If the power of described electromagnetic heating system is greater than described target power, described controller is by controlling described drive circuit to reduce the ON time of described IGBT in next turn-on cycle;
If the power of described electromagnetic heating system is less than described target power, described controller is by controlling described drive circuit to increase the ON time of described IGBT in next turn-on cycle.
5. the current detecting of electromagnetic heating system as claimed in claim 3 and protecting control device, it is characterized in that, described Preset Time is a half wave cycles of described electric main.
6. the current detecting of electromagnetic heating system as claimed in claim 1 and protecting control device, it is characterized in that, described current detection circuit specifically comprises:
Sampling resistor, one end of described sampling resistor is extremely connected with the E of described IGBT, the other end ground connection of described sampling resistor;
Filter resistance, one end of described filter resistance is connected with one end of described sampling resistor with the E pole of described IGBT respectively;
Filter capacitor, one end of described filter capacitor is connected with the other end of described filter resistance, the other end ground connection of described filter capacitor, have first node between one end of described filter capacitor and the other end of described filter resistance, described first node is connected with described controller.
7. an electromagnetic heating system, is characterized in that, comprises current detecting and the protecting control device of the electromagnetic heating system according to any one of claim 1-6.
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| CN107041026A (en) * | 2015-07-29 | 2017-08-11 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its current detecting and protection control device, method |
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| CN108076546B (en) * | 2016-11-15 | 2021-12-21 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and protection device and protection method thereof |
| CN108076543A (en) * | 2016-11-18 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its zero crossing detection device and method |
| CN108076547A (en) * | 2016-11-18 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its zero crossing detection device and method |
| CN108738180A (en) * | 2017-04-14 | 2018-11-02 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its control method |
| CN112888099A (en) * | 2019-11-29 | 2021-06-01 | 浙江绍兴苏泊尔生活电器有限公司 | IGBT control method of half-bridge electromagnetic appliance and half-bridge electromagnetic heating appliance |
| CN112888099B (en) * | 2019-11-29 | 2022-08-30 | 浙江绍兴苏泊尔生活电器有限公司 | IGBT control method of half-bridge electromagnetic appliance and half-bridge electromagnetic heating appliance |
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