CN106714349A - Electromagnetic heating system and control method of electromagnetic heating system - Google Patents

Electromagnetic heating system and control method of electromagnetic heating system Download PDF

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Publication number
CN106714349A
CN106714349A CN201510432284.6A CN201510432284A CN106714349A CN 106714349 A CN106714349 A CN 106714349A CN 201510432284 A CN201510432284 A CN 201510432284A CN 106714349 A CN106714349 A CN 106714349A
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CN
China
Prior art keywords
electromagnetic heating
voltage zero
crossing signal
power
fan
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Pending
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CN201510432284.6A
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Chinese (zh)
Inventor
江德勇
李宝刚
曾露添
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Midea Group Co Ltd
Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Original Assignee
Midea Group Co Ltd
Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Priority to CN201510432284.6A priority Critical patent/CN106714349A/en
Publication of CN106714349A publication Critical patent/CN106714349A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a control method of an electromagnetic heating system and the electromagnetic heating system. The control method comprises a step of adding one to a voltage zero-crossing signal counter at the interval of a first preset time to obtain a voltage zero-crossing signal counting value, and resetting the voltage zero-crossing signal counter when a voltage zero-crossing signal of an AC power supply is detected, a step of judging whether the electromagnetic heating system suddenly loses power according to the voltage zero-crossing signal counting value, and a step of controlling a fan in the electromagnetic heating system to work so as to rapidly reduce the remaining voltage of the plug of the electromagnetic heating system if a condition that electromagnetic heating system suddenly loses power is judged. According to the control method, when the electromagnetic heating system suddenly loses power, the remaining voltage of the plug of the electromagnetic heating system can be rapidly reduced.

Description

The control method of electromagnetic heating system and electromagnetic heating system
Technical field
The present invention relates to living electric apparatus technical field, the control method and a kind of electromagnetism of more particularly to a kind of electromagnetic heating system Heating system.
Background technology
In order to meet requirement of the market to the Electro Magnetic Compatibility of electromagnetic oven, generally, EMC is had additional on the electric-controlled plate of electromagnetic oven (Electro Magnetic Compatibility, Electro Magnetic Compatibility) module is solving electromagnetic compatibility problem.But, increase If EMC modules can to control circuit bring certain influence, for example, due to including filter capacitor and filter in EMC modules Ripple inductance, after electromagnetism furnace power-off, still suffers from certain electric charge so that the voltage of the plug of electromagnetic oven is not allowed on filter capacitor Easily decline, cause to power off the residual voltage of the plug of electromagnetic oven after 1s still greater than 34V, and the 22.5th in GB4706.1-2005 Bar specifies that the voltage after power-off 1s between each pin of plug is not to be exceeded 34V.
In correlation technique, by the purpose for increasing the discharge resistance of appropriate resistance in main circuit to reach repid discharge, it is ensured that The residual voltage of the plug of electromagnetic oven is no more than 34V after power-off 1s, but because of discharge resistance connection on the main circuit, can consume Certain power, increased stand-by power consumption, therefore there is the exceeded risk of complete machine stand-by power consumption.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, one of the invention Purpose is to propose that one kind after electromagnetic heating system is powered off suddenly or plug is unplugged, can quickly reduce electromagnetic heating system Plug residual voltage electromagnetic heating system control method.
It is another object of the present invention to propose a kind of electromagnetic heating system.
To reach above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of control method of electromagnetic heating system, including with Lower step:Add one by voltage zero-crossing signal counter every the first Preset Time to obtain voltage zero-crossing signal count value, and When detecting the voltage zero-crossing signal of AC power, by the voltage zero-crossing signal counter O reset;According to the voltage zero-cross Signal-count value judges whether the electromagnetic heating system occurs power-off suddenly;If it is determined that the electromagnetic heating system occurs to dash forward So power-off, then control the fan in the electromagnetic heating system to be operated quickly to reduce the plug of the electromagnetic heating system Residual voltage.
The control method of electromagnetic heating system according to embodiments of the present invention, can be by the counting of voltage zero-crossing signal counter Value judges whether electromagnetic heating system occurs whether power-off or plug suddenly are unplugged, and occurs in electromagnetic heating system prominent After so power-off or plug are unplugged, the fan in control electromagnetic heating system is operated to accelerate to reduce electromagnetic heating system Plug residual voltage, it is ensured that power-off 1s after plug residual voltage be no more than 34V.
According to one embodiment of present invention, whether the electromagnetic heating system is judged according to the voltage zero-crossing signal count value There is power-off suddenly, specifically include:Judge the voltage zero-crossing signal count value whether more than the first predetermined threshold value;If institute Voltage zero-crossing signal count value is stated more than first predetermined threshold value, then judges that the electromagnetic heating system occurs power-off suddenly.
According to one embodiment of present invention, first Preset Time is 10ms, and first predetermined threshold value is 2.
To reach above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of electromagnetic heating system, including:EMC modules, The input of the EMC modules is connected with AC power;Voltage zero-cross detection unit, the voltage zero-cross detection unit and institute The output end for stating EMC modules is connected to detect the voltage zero-crossing signal of the AC power;Fan;Fan driving unit, institute Fan driving unit is stated to be connected to drive the fan to be operated with the fan;Main control unit, the main control unit difference It is connected with the voltage zero-cross detection unit and the fan driving unit, the main control unit includes voltage zero-cross counter, The voltage zero-crossing signal counter is added one to obtain voltage zero-crossing signal counting by the main control unit every the first Preset Time Value, and believe the voltage zero-cross when the voltage zero-cross detection unit detects the voltage zero-crossing signal of the AC power Number counter O reset, and to judge whether the electromagnetic heating system occurs according to the voltage zero-crossing signal count value disconnected suddenly Electricity, and when judging that the electromagnetic heating system occurs power-off suddenly, the main control unit is by the fan driving unit control The fan is made to be operated quickly to reduce the residual voltage of the plug of the electromagnetic heating system.
Electromagnetic heating system according to embodiments of the present invention, adds voltage zero-cross counter every the first Preset Time main control unit One to obtain voltage zero-crossing signal count value, while after the voltage zero-crossing signal for detecting AC power, by voltage zero-cross meter Number device resets, and main control unit judges whether electromagnetic heating system occurs power-off suddenly or slotting according to voltage zero-crossing signal count value Whether head is unplugged, and when judging that electromagnetic heating system occurs to power off suddenly or plug is unplugged, main control unit passes through wind Fan driver element control fan is operated to reach the purpose of the residual voltage of the quick plug for reducing electromagnetic heating system, is protected The residual voltage of plug is no more than 34V after card power-off 1s.
According to one embodiment of present invention, the main control unit judges the electromagnetism according to the voltage zero-crossing signal count value When whether heating system occurs to power off suddenly, if the voltage zero-crossing signal count value is more than the first predetermined threshold value, the master Control unit then judges that the electromagnetic heating system occurs power-off suddenly.
According to one embodiment of present invention, first Preset Time is 10ms, and first predetermined threshold value is 2.
In some embodiments of the invention, above-mentioned electromagnetic heating system, also including switching power supply, the switch electricity Source unit respectively with the main control unit, the fan driving unit and IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) driver element be connected with to the main control unit, the fan driving unit Powered with the IGBT driver elements.
Brief description of the drawings
Fig. 1 is the flow chart of the control method of electromagnetic heating system according to embodiments of the present invention.
Fig. 2 is the flow chart of fan control according to an embodiment of the invention.
Fig. 3 is the interrupt routine of voltage zero-crossing signal according to an embodiment of the invention.
Fig. 4 is the structural representation of electromagnetic heating system according to an embodiment of the invention.
Fig. 5 is the block diagram of electromagnetic heating system according to an embodiment of the invention.
Fig. 6 is the structural representation of electromagnetic heating system according to an embodiment of the invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein identical from start to finish Or similar label represents same or similar element or the element with same or like function.Retouched below with reference to accompanying drawing The embodiment stated is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
Add describing the control method and electromagnetism of the electromagnetic heating system of proposition according to embodiments of the present invention with reference to the accompanying drawings Hot systems.
Fig. 1 is the flow chart of the control method of electromagnetic heating system according to embodiments of the present invention.As shown in figure 1, the electromagnetism The control method of heating system is comprised the following steps:
S1, adds one to obtain voltage zero-crossing signal count value every the first Preset Time by voltage zero-crossing signal counter, and When detecting the voltage zero-crossing signal of AC power, by voltage zero-crossing signal counter O reset.Wherein, the first Preset Time can Demarcated with according to actual conditions, for example, the first Preset Time can be 10ms.
S2, judges whether electromagnetic heating system occurs power-off suddenly according to voltage zero-crossing signal count value.
S3, if it is determined that electromagnetic heating system occur suddenly power-off, then control electromagnetic heating system in fan be operated with The residual voltage of the quick plug for reducing electromagnetic heating system.
According to one embodiment of present invention, judge whether electromagnetic heating system occurs suddenly according to voltage zero-crossing signal count value Power-off, specifically includes:Judge voltage zero-crossing signal count value whether more than the first predetermined threshold value;If voltage zero-crossing signal meter Numerical value is more than the first predetermined threshold value, then judge that electromagnetic heating system occurs power-off suddenly.Wherein, the first predetermined threshold value can be with root Demarcated according to actual conditions, for example, the first predetermined threshold value can be 2.
If that is, be not detected by the voltage zero-crossing signal of AC power, every the first Preset Time by voltage zero-cross The count value of counter adds 1, and after the voltage zero-crossing signal for detecting AC power, then by voltage zero-cross counter O reset. Whether the count value of voltage zero-cross counter is judged more than the first predetermined threshold value, if count value is more than the first predetermined threshold value, Judge that the plug (attaching plug) that electromagnetic heating system occurs power-off or electromagnetic heating system suddenly is unplugged.
In one particular embodiment of the present invention, as shown in Fig. 2 fan control process is comprised the following steps:
S101, judges whether fan needs work.If it is, performing step S106;If not, performing step S102.
It is understood that the fan generally in electromagnetic heating system is used to radiate, i.e., when component in electromagnetic heating system When temperature reaches uniform temperature value or electromagnetic heating system is heated, control fan is operated and is radiated with to component, Effectively prevent component temperature too high and damage, now, even if electromagnetic heating system occurs power-off suddenly, due to component Temperature is higher or electromagnetic heating system is in heated condition, and fan therefore, it can add electromagnetism still in working condition The plug of hot systems carries out reduction of blood pressure in high-speed, and is detected without the working condition to electromagnetic heating system.
And when fan need not work, it may be possible to the temperature of component when electromagnetic heating system works less than uniform temperature value or Electromagnetic heating system is in holding state, and electromagnetic heating system occurs power-off or user suddenly and pulls out electromagnetic heating system Plug, in order to prevent from powering off the residual voltage of the plug of electromagnetic heating system after 1s more than 34V, in embodiments of the invention In, when electromagnetic heating system occurs to power off suddenly or plug is unplugged, fast prompt drop is reached by controlling fan to be operated The purpose of the residual voltage of undershoot head, at this time, it may be necessary to judge the current operating state of electromagnetic heating system, so as to Electromagnetic heating system occurs to perform corresponding actions instruction during power-off suddenly.
S102, the count value of voltage zero-cross counter adds 1 per 10ms.That is, every 10ms by voltage zero-cross counter Count value add 1.
Whether S103, judge the count value of voltage zero-cross counter more than 2.If it is, performing step S105;If not, Perform step S104.
S104, control fan is stopped.
S105, the count value of voltage zero-cross counter is equal to 3.
S106, control fan is operated.
Knowable to step S103 to S106, if the count value of voltage zero-cross counter be more than 2, i.e., more than 20ms when The interior voltage zero-crossing signal interrupt routine being all introduced into shown in Fig. 3 is to voltage zero-cross counter O reset, then judging that electromagnetism adds Hot systems are in off-position, at this time, it may be necessary to control fan to be operated to consume the electricity on main circuit, reach fast prompt drop The purpose of the residual voltage of undershoot head.When voltage zero-crossing signal is detected, show that the AC power of electromagnetic heating system is in Normal operating conditions, now the voltage zero-crossing signal interrupt routine shown in Fig. 3 is with to voltage zero-cross counter O reset.
Further, a specific example of the invention, as shown in figure 4, when electromagnetic heating system energization work, The count value of the voltage zero-cross counter in main control unit adds 1 every 10ms, when main control unit detects voltage zero-crossing signal, Voltage zero-crossing signal interrupt routine shown in Fig. 3, by voltage zero-cross counter O reset.
And after working as electromagnetic heating system generation power-off suddenly, due to the presence of switching power supply, switching power supply will continue Powered to main control unit, the count value of voltage zero-cross counter still adds 1 every 10ms, but nothing after electromagnetic heating system power-off Voltage zero-crossing signal, therefore the voltage zero-crossing signal interrupt routine shown in Fig. 3 can not be entered, voltage zero-cross counter will not be clear Zero, when the count value of voltage zero-cross counter is more than 2, main control unit judges electromagnetic heating system power-off or Electromagnetic Heating The plug of system is unplugged, and sends fan working signal to fan driving unit, to drive fan to be operated, so that logical The power consumption of increase switching power supply is crossed to reach the purpose of the quick residual voltage for reducing plug.In addition, can from Fig. 4 Go out, the discharge resistance R1 being arranged in correlation technique in main circuit is eliminated (here by the control method of the embodiment of the present invention Discharge resistance R1 is drawn merely for convenience of description, and in an embodiment of the present invention, not comprising discharge resistance R1), from And stand-by power consumption is effectively reduced, reduces cost.
In sum, the control method of electromagnetic heating system according to embodiments of the present invention, first will every the first Preset Time Voltage zero-crossing signal counter adds one to obtain voltage zero-crossing signal count value, and believes in the voltage zero-cross for detecting AC power Number when, by voltage zero-crossing signal counter O reset, whether electromagnetic heating system is then judged according to voltage zero-crossing signal count value Whether the plug that power-off or electromagnetic heating system suddenly occur is unplugged, and power-off suddenly occurs in electromagnetic heating system or inserts When head is unplugged, the fan in control electromagnetic heating system is operated to reach the quick plug for reducing electromagnetic heating system The purpose of residual voltage, it is ensured that the residual voltage of plug is no more than 34V after power-off 1s, meanwhile, can save and be arranged on main electricity Discharge resistance in road, so that stand-by power consumption is effectively reduced, reduces cost.
Fig. 5 is the block diagram of electromagnetic heating system according to embodiments of the present invention.As shown in figure 5, the Electromagnetic Heating system System includes:EMC modules 10, voltage zero-cross detection unit 20, fan 30, fan driving unit 40 and main control unit 60.
Wherein, the input of EMC modules 10 is connected with AC power, voltage zero-cross detection unit 20 and EMC modules 10 Output end is connected to detect the voltage zero-crossing signal of AC power, and fan driving unit 40 is connected to drive fan with fan 30 30 are operated, and main control unit 60 is connected with voltage zero-cross detection unit 20 and fan driving unit 40 respectively, master control list Unit 60 includes voltage zero-crossing signal counter, and main control unit 60 adds voltage zero-crossing signal counter every the first Preset Time One to obtain voltage zero-crossing signal count value, and detects the voltage zero-crossing signal of AC power in voltage zero-cross detection unit 20 When by voltage zero-crossing signal counter O reset, and judge whether electromagnetic heating system occurs according to voltage zero-crossing signal count value Suddenly power-off, and when judging that electromagnetic heating system occurs power-off suddenly, main control unit 60 is controlled by fan driving unit 40 Fan processed 30 is operated quickly to reduce the residual voltage of the plug of electromagnetic heating system.Wherein, the first Preset Time can be with It is 10ms.
According to one embodiment of present invention, main control unit 60 judges that electromagnetic heating system is according to voltage zero-crossing signal count value During no generation power-off suddenly, if voltage zero-crossing signal count value is more than the first predetermined threshold value, main control unit 60 then judges electromagnetism There is power-off suddenly in heating system.Wherein, the first predetermined threshold value can be 2.
If that is, main control unit 60 is not detected by the voltage zero-crossing signal of AC power, every the first Preset Time The count value of the voltage zero-cross counter in main control unit 60 adds 1, and if main control unit 60 detects the electricity of AC power Zero-signal is pressed through, then main control unit 60 is by voltage zero-cross counter O reset.Main control unit 60 also judges voltage zero-cross counter Count value whether be more than the first predetermined threshold value, and count value be more than the first predetermined threshold value when, main control unit 60 judges electromagnetism The plug that heating system occurs power-off or electromagnetic heating system suddenly is unplugged.
Specifically, as shown in Fig. 2 main control unit 60 first determines whether whether fan 30 needs work, if fan 30 needs Work, then the control of main control unit 60 fan 30 is operated;If fan 30 starts according to voltage zero-cross without work Signal-count value judges whether the plug whether electromagnetic heating system occurs power-off or electromagnetic heating system suddenly is unplugged.Specifically For, if the count value of voltage zero-cross counter is more than 2, i.e., all it is introduced into shown in Fig. 3 within the time more than 20ms With to voltage zero-cross counter O reset, then to judge that electromagnetic heating system is in disconnected for main control unit 60 for voltage zero-crossing signal interrupt routine Electricity condition, at this time, it may be necessary to the control fan 30 of main control unit 60 is operated to consume the electricity on main circuit, reaches quick Reduce the purpose of the residual voltage of plug.When main control unit 60 detects voltage zero-crossing signal, show electromagnetic heating system AC power is in normal operating conditions, now into the voltage zero-crossing signal interrupt routine shown in Fig. 3 in terms of to voltage zero-cross Number device resets.
Wherein, main control unit 60 also needs to judge whether fan 30 needs when judging whether electromagnetic heating system occurs to power off suddenly Work, reason is:Fan 30 in usual electromagnetic heating system is used to radiate, i.e., when component in electromagnetic heating system Temperature when reaching uniform temperature value or electromagnetic heating system and being in heating, the control fan 30 of main control unit 60 be operated with Radiated to component, effectively prevent component temperature too high and damage, now, even if electromagnetic heating system occurs suddenly Power-off, because fan 30 is still in working condition, therefore, it can carry out the plug of electromagnetic heating system reduction of blood pressure in high-speed, and Detected without the working condition to electromagnetic heating system.And when fan 30 need not work, it may be possible to electromagnetic heating system The temperature of component during work is less than uniform temperature value;Or electromagnetic heating system is in holding state, and Electromagnetic Heating There is the plug that power-off or user suddenly pull out electromagnetic heating system in system.In order to prevent power off 1s after electromagnetic heating system insert The residual voltage of head is more than 34V, in an embodiment of the present invention, power-off or plug suddenly occurs in electromagnetic heating system and is pulled out When falling, main control unit 60 by the purpose that controls fan 30 to be operated to reach the quick residual voltage for reducing plug, this When, it is necessary to judge the current operating state of electromagnetic heating system, so as to when there is power-off suddenly in electromagnetic heating system Perform corresponding actions instruction.
According to one embodiment of present invention, as shown in fig. 6, above-mentioned electromagnetic heating system also includes switching power supply 50, Switching power supply 50 is connected with to master control with main control unit 60, fan driving unit 40 and IGBT driver elements 70 respectively Unit 60, fan driving unit 40 and IGBT driver elements 70 are powered.
Specifically, as shown in fig. 6, when electromagnetic heating system energization work, the voltage zero-cross counter in main control unit 60 Count value add 1 every 10ms, when main control unit 60 detects voltage zero-crossing signal, the voltage mistake shown in Fig. 3 Zero-signal interrupt routine, by voltage zero-cross counter O reset.
And after working as electromagnetic heating system generation power-off suddenly, due to the presence of switching power supply 50, switching power supply 50 To continue to be powered to main control unit 60, the count value of voltage zero-cross counter still adds 1 every 10ms, but Electromagnetic Heating system No-voltage zero cross signal after system power-off, therefore the voltage zero-crossing signal interrupt routine shown in Fig. 3, voltage zero-cross meter can not be entered Number device will not reset, and when the count value of voltage zero-cross counter is more than 2, main control unit 60 judges that electromagnetic heating system is powered off Or the plug of electromagnetic heating system is unplugged, and fan working signal is sent to fan driving unit 40, to drive fan 30 It is operated, so as to reach the purpose of the quick residual voltage for reducing plug by increasing the power consumption of switching power supply 50, The residual voltage of plug is no more than 34V after guarantee power-off 1s.In addition, from fig. 6, it can be seen that in the electricity of the embodiment of the present invention In magnetic heating system, eliminate the discharge resistance R1 being arranged in main circuit in correlation technique and (here draw discharge resistance R1 Go out merely for convenience of description, and in an embodiment of the present invention, not comprising discharge resistance R1), so as to effectively reduce standby Power consumption, reduces cost.
Electromagnetic heating system according to embodiments of the present invention, adds voltage zero-cross counter every the first Preset Time main control unit One to obtain voltage zero-crossing signal count value, while after the voltage zero-crossing signal for detecting AC power, by voltage zero-cross meter Number device resets, and main control unit judges whether electromagnetic heating system occurs power-off suddenly or slotting according to voltage zero-crossing signal count value Whether head is unplugged, and when judging that electromagnetic heating system occurs to power off suddenly or plug is unplugged, main control unit passes through wind Fan driver element control fan is operated to reach the purpose of the residual voltage of the quick plug for reducing electromagnetic heating system, is protected The residual voltage of plug is no more than 34V after card power-off 1s.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", the orientation or position relationship of the instruction such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on Orientation shown in the drawings or position relationship, are for only for ease of and describe of the invention and simplify description, rather than instruction or hint institute The device or element of finger must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this hair Bright limitation.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, " first " is defined, the feature of " second " can be expressed Or implicitly include at least one this feature.In the description of the invention, " multiple " is meant that at least two, such as two It is individual, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " Should be interpreted broadly Deng term, for example, it may be fixedly connected, or be detachably connected, or integrally;Can be Mechanically connect, or electrically connect;Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two The connection of individual element internal or two interaction relationships of element, unless otherwise clearly restriction.It is common for this area For technical staff, above-mentioned term concrete meaning in the present invention can be as the case may be understood.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can Being the first and second feature directly contacts, or the first and second features pass through intermediary mediate contact.And, the One feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or Oblique upper, or fisrt feature level height is merely representative of higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or to be merely representative of first special Level height is levied less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. mean to combine the specific features of the embodiment or example description, structure, material or Feature is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term Necessarily it is directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be with Combined in an appropriate manner in any one or more embodiments or example.Additionally, in the case of not conflicting, ability The technical staff in domain can enter the feature of the different embodiments or example described in this specification and different embodiments or example Row is combined and combined.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment be it is exemplary, It is not considered as limiting the invention, one of ordinary skill in the art within the scope of the invention can be to above-described embodiment It is changed, changes, replacing and modification.

Claims (7)

1. a kind of control method of electromagnetic heating system, it is characterised in that comprise the following steps:
Voltage zero-crossing signal counter is added one every the first Preset Time to obtain voltage zero-crossing signal count value, and in detection To AC power voltage zero-crossing signal when, by the voltage zero-crossing signal counter O reset;
Judge whether the electromagnetic heating system occurs power-off suddenly according to the voltage zero-crossing signal count value;
If it is determined that the electromagnetic heating system occurs power-off suddenly, then the fan in the electromagnetic heating system is controlled to carry out work Make quickly to reduce the residual voltage of the plug of the electromagnetic heating system.
2. the method for claim 1, it is characterised in that the electricity is judged according to the voltage zero-crossing signal count value Whether magnetic heating system there is power-off suddenly, specifically include:
Judge the voltage zero-crossing signal count value whether more than the first predetermined threshold value;
If the voltage zero-crossing signal count value is more than first predetermined threshold value, judge that the electromagnetic heating system occurs Suddenly power-off.
3. method as claimed in claim 2, it is characterised in that first Preset Time is 10ms, described first presets Threshold value is 2.
4. a kind of electromagnetic heating system, it is characterised in that including:
EMC modules, the input of the EMC modules is connected with AC power;
Voltage zero-cross detection unit, the voltage zero-cross detection unit is connected described to detect with the output end of the EMC modules The voltage zero-crossing signal of AC power;
Fan;
Fan driving unit, the fan driving unit is connected to drive the fan to be operated with the fan;
Main control unit, the main control unit is connected with the voltage zero-cross detection unit and the fan driving unit respectively, institute Stating main control unit includes voltage zero-crossing signal counter, and the main control unit believes the voltage zero-cross every the first Preset Time Number counter adds one to obtain voltage zero-crossing signal count value, and detects the alternating current in the voltage zero-cross detection unit By the voltage zero-crossing signal counter O reset during voltage zero-crossing signal in source, and according to the voltage zero-crossing signal count value Judge whether the electromagnetic heating system occurs power-off suddenly, and when judging that the electromagnetic heating system occurs power-off suddenly, The main control unit controls the fan to be operated quickly to reduce the electromagnetic heating system by the fan driving unit Plug residual voltage.
5. electromagnetic heating system as claimed in claim 4, it is characterised in that the main control unit is according to the voltage zero-cross When signal-count value judges whether the electromagnetic heating system occurs to power off suddenly, if the voltage zero-crossing signal count value is big In the first predetermined threshold value, the main control unit then judges that the electromagnetic heating system occurs power-off suddenly.
6. electromagnetic heating system as claimed in claim 5, it is characterised in that first Preset Time is 10ms, described First predetermined threshold value is 2.
7. the electromagnetic heating system as any one of claim 4-6, it is characterised in that also including switching power supply, The switching power supply is connected with to described with the main control unit, the fan driving unit and IGBT driver elements respectively Main control unit, the fan driving unit and the IGBT driver elements are powered.
CN201510432284.6A 2015-07-21 2015-07-21 Electromagnetic heating system and control method of electromagnetic heating system Pending CN106714349A (en)

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CN109425777A (en) * 2017-09-05 2019-03-05 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating apparatus and its power failure detection method and device
CN109425777B (en) * 2017-09-05 2021-04-20 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating equipment and power failure detection method and device thereof
CN109699097A (en) * 2017-10-24 2019-04-30 佛山市顺德区美的电热电器制造有限公司 The overheat abnormality eliminating method and device of electromagnetic heating cooking utensil and its IGBT

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