CN206353870U - Electromagnetic heating system and its protection device - Google Patents
Electromagnetic heating system and its protection device Download PDFInfo
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- CN206353870U CN206353870U CN201621383250.9U CN201621383250U CN206353870U CN 206353870 U CN206353870 U CN 206353870U CN 201621383250 U CN201621383250 U CN 201621383250U CN 206353870 U CN206353870 U CN 206353870U
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Abstract
The utility model discloses a kind of electromagnetic heating system and its protection device, the device includes：Voltage sampling circuit, it is connected with power supply, and it is used to generate voltage sampling signal according to the voltage of power supply, wherein, power supply is used to power for electromagnetic heating system；Voltage conversion circuit, it is connected with voltage sampling circuit, and it is used to carry out transformation processing to voltage sampling signal；Triggers circuit, it is connected with voltage conversion circuit, and it is used to generate trigger signal according to the voltage sampling signal after transformation；Control chip, it is connected with triggers circuit, and it is used for the control electromagnetic heating system when the voltage that power supply is judged according to trigger signal exceeds predetermined voltage range and stops heating.The utility model embodiment to voltage jump by detecting, it is possible to prevente effectively from electromagnetic heating system works in high voltage low power or low pressure high power state, it is to avoid switching tube excessively stream caused by abnormal current punctures, and is protected when electric voltage exception is fluctuated.
Description
Technical field
The utility model is related to household electrical appliance technical field, the protection device and one of more particularly to a kind of electromagnetic heating system
Plant electromagnetic heating system.
Background technology
In the related art, electromagnetic heating system controls the heating work(of output by adjusting the size of output pulse signal
Rate, and control chip control wave size depend on actual circuit sample voltage value.But, in heating process often
The phenomenon of the voltage pulsation of power supply occurs, and the power adjusting of control chip needs one section of reaction time, it is therefore, related
There are following two shortcomings in the electromagnetic heating system in technology：
First, when the voltage of power supply is in low pressure range, electromagnetic heating system is heated with lower-wattage, and voltage is such as
Fruit then occurs that high voltage low power heats transient process, now, the IGBT plumbers of electromagnetic heating system from low pressure mutation to high pressure
Make in high pressure opening state, there is the risk that excessively stream punctures.
Second, when the voltage of power supply is in high pressure range, electromagnetic heating system is heated with higher-wattage, and voltage is such as
Fruit sports low pressure from high pressure, then occurs that low pressure high power heats transient process, now, the IGBT plumbers of electromagnetic heating system
Make in serious hysteretic state, equally exist the risk that excessively stream punctures.
Therefore, correlation technique needs to be improved.
Utility model content
The utility model is intended at least solve one of technical problem in correlation technique to a certain extent.Therefore, this reality
It is to propose a kind of protection device of electromagnetic heating system with a new purpose, the device can be when electric voltage exception be fluctuated
Electromagnetic heating system is protected.
Another purpose of the present utility model is to propose a kind of electromagnetic heating system.
To reach above-mentioned purpose, on the one hand the utility model proposes a kind of protection device of electromagnetic heating system, including：
Voltage sampling circuit, the voltage sampling circuit is connected with power supply, and the voltage sampling circuit is used for according to the power supply
The voltage generation voltage sampling signal of power supply, wherein, the power supply is used to power for the electromagnetic heating system；Voltage becomes
Circuit is changed, the voltage conversion circuit is connected with the voltage sampling circuit, the voltage conversion circuit is used for the voltage
Sampled signal carries out transformation processing；Triggers circuit, the triggers circuit is connected with the voltage conversion circuit, the triggers circuit
For generating trigger signal according to the voltage sampling signal after transformation；Control chip, the control chip and the triggers circuit
It is connected, the control chip is used to exceed predetermined voltage range in the voltage for judging the power supply according to the trigger signal
When control the electromagnetic heating system to stop heating.
According to the utility model proposes electromagnetic heating system protection device, voltage sampling circuit is according to power supply
Voltage generates voltage sampling signal, and voltage conversion circuit carries out transformation processing to voltage sampling signal, and triggers circuit is according to transformation
Afterwards voltage sampling signal generation trigger signal, and then, control chip according to trigger signal judge power supply voltage whether
Beyond predetermined voltage range, and when judging that voltage exceeds predetermined voltage range, control electromagnetic heating system stops heating.Thus,
The protection device of electromagnetic heating system of the present utility model to voltage jump by detecting, it is possible to prevente effectively from Electromagnetic Heating
System works in high voltage low power or low pressure high power state, it is to avoid the switch of electromagnetic heating system caused by abnormal current
Pipe excessively stream punctures, and electromagnetic heating system can be protected when electric voltage exception is fluctuated, improve the reliability of system.
Further, the voltage sampling circuit includes：Rectification unit, the input of the rectification unit and the power supply
Power supply is connected, and the rectification unit is used to carry out rectification to the alternating current that the power supply is provided；Partial pressure unit, the partial pressure
The input of unit is connected with the output end of the rectification unit, the output end of the partial pressure unit and the voltage conversion circuit
It is connected, the partial pressure unit is used to the alternating current after rectification is carried out partial pressure to generate the voltage sampling signal.
Further, the rectification unit includes：First diode, the anode of first diode and the power supply electricity
The first end in source is connected；Second diode, the anode of second diode is connected with the second end of the power supply, described
The negative electrode of second diode is connected with the negative electrode of first diode and has a first node, the first node with described point
The input of unit is pressed to be connected.
Further, the partial pressure unit includes：First resistor, second resistance and the 3rd resistor being sequentially connected in series, it is described
One end of first resistor is connected with the first node, one end of the second resistance and the other end phase of the first resistor
Even, one end of the 3rd resistor is connected with the other end of the second resistance and has Section Point, the 3rd resistor
The other end is grounded, and the Section Point is connected with the voltage conversion circuit.
Further, the partial pressure unit also includes：First electric capacity, first electric capacity is in parallel with the 3rd resistor；
Electrochemical capacitor, the electrochemical capacitor is in parallel with first electric capacity.
Further, the voltage conversion circuit includes：Operational amplifier；4th resistance, one end of the 4th resistance
Ground connection, the other end of the 4th resistance is connected with the negative input end of the operational amplifier；5th resistance, the 5th resistance
One end be connected with the voltage sampling circuit, the positive input terminal phase of the other end and the operational amplifier of the 5th resistance
Even；6th resistance, one end of the 6th resistance is connected with the positive input terminal of the operational amplifier, the 6th resistance it is another
One end is connected with the output end of the operational amplifier, and the output end of the operational amplifier is connected with the triggers circuit；The
Two electric capacity, one end of second electric capacity is connected with the positive input terminal of the operational amplifier, the other end of second electric capacity
Ground connection.
Further, the triggers circuit includes 555 timers, and the first pin of 555 timer is grounded, and described 555
The crus secunda of timer is connected after being connected with the 6th pin with the voltage conversion circuit, the 3rd pin of 555 timer and institute
State control chip to be connected, the 4th pin of 555 timer is connected after with octal being connected with the first default power supply, described 555
7th pin of timer is connected by the 7th resistance with the second predeterminated voltage.
Specifically, the control chip judges the power supply when the trigger signal is in rising edge or trailing edge
Voltage exceed the predetermined voltage range.
Preferably, the upper limit separation of the predetermined voltage range can be 240V, the lower limit point of the predetermined voltage range
Boundary's point can be 180V.
To reach above-mentioned purpose, a kind of electromagnetic heating system that on the other hand the utility model proposes, including described electricity
The protection device of magnetic heating system.
According to the utility model proposes electromagnetic heating system, by the protection device of above-mentioned electromagnetic heating system, to electricity
Pressure mutation is detected, it is possible to prevente effectively from electromagnetic heating system works in high voltage low power or low pressure high power state, is kept away
The switching tube excessively stream for having exempted from electromagnetic heating system caused by abnormal current punctures, can be when electric voltage exception is fluctuated to Electromagnetic Heating
System is protected, and improves the reliability of system.
Brief description of the drawings
Fig. 1 is the block diagram of the protection device of the electromagnetic heating system according to the utility model embodiment；
Fig. 2 is the circuit theory diagrams of the protection device of the electromagnetic heating system according to the utility model one embodiment；With
And
Fig. 3 is the block diagram of the electromagnetic heating system according to the utility model embodiment.
Reference：
Protection device 100, power supply 200, resonance heating unit 300 and the rectification filtering module of electromagnetic heating system
400；
Voltage sampling circuit 10, voltage conversion circuit 20, triggers circuit 30 and control chip 40；
IGBT pipes 310, resonant capacitance C0 and heating coil L0；
Rectification unit 101 and partial pressure unit 102；
First diode D1 and the second diode D2；
First resistor R1, second resistance R2 and 3rd resistor R3；
First electric capacity C1 and electrochemical capacitor C10；
Operational amplifier 201, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the second electric capacity C2；
555 timers 301 and the 7th resistance R7；Rectification module 401 and filtration module 402.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
Below with reference to the accompanying drawings come describe the utility model embodiment proposition electromagnetic heating system and its protection device.
Fig. 1 is the block diagram of the protection device of the electromagnetic heating system according to the utility model embodiment.Such as Fig. 1 institutes
Show, the protection device 100 of electromagnetic heating system includes：Voltage sampling circuit 10, voltage conversion circuit 20, triggers circuit 30 and control
Coremaking piece 40.
Wherein, voltage sampling circuit 10 is connected with power supply 200, and voltage sampling circuit 10 is used for according to power supply
200 voltage generation voltage sampling signal, wherein, power supply unit 200 is used to power for electromagnetic heating system；Voltage conversion circuit
20 are connected with voltage sampling circuit 10, and voltage conversion circuit 20 is used to carry out transformation processing to voltage sampling signal；Triggers circuit
30 are connected with voltage conversion circuit 20, and triggers circuit 30 is used to generate trigger signal according to the voltage sampling signal after transformation；Control
Coremaking piece 40 is connected with triggers circuit 30, and control chip 40 is used to surpass in the voltage for judging power supply 200 according to trigger signal
Control electromagnetic heating system stops heating when going out predetermined voltage range.
Specifically, in the course of work of electromagnetic heating system, power supply 200 is powered for electromagnetic heating system, together
When, the voltage of the real-time sampling power supply 200 of voltage sampling circuit 10 simultaneously generates voltage sampling signal, 20 pairs of voltage conversion circuit
Voltage sampling signal carries out transformation processing, so that the voltage sampling signal after transformation matches with triggers circuit 30.In triggering electricity
Road 30 is received after the voltage sampling signal after transformation, if the level for the trigger signal that triggers circuit 30 is exported keeps not variants
High level or low level are such as in, control chip 40 then judges the voltage of power supply 200 without departing from predetermined voltage range, and controls
Electromagnetic heating system processed proceeds power output；If the trigger signal that triggers circuit 30 is exported is overturn, core is controlled
Piece 40 judges that the voltage of power supply 200 exceeds predetermined voltage range, and controls electromagnetic heating system to stop heating, and examines again
The voltage change of power supply 200 is surveyed, when fluctuation of the voltage in preset time of power supply 200 is less than default fluctuation model
Enclose, then judge that the voltage of power supply 200 is stablized again, control chip 40 controls electromagnetic heating system power output again.
According to one embodiment of the present utility model, control chip 40 is sentenced when trigger signal is in rising edge or trailing edge
The voltage of disconnected power supply 200 exceeds predetermined voltage range.
According to a specific embodiment of the present utility model, the upper limit separation of predetermined voltage range can be 240V, preset
The lower limit separation of voltage range can be 180V.
Specifically, control chip 40 is the core of electromagnetic heating system, and control chip 40 is used to control Electromagnetic Heating system
The power output of system.In embodiment of the present utility model, the external interrupt type of control chip 40 is set to be touched for two-way edge
Hair is rising edge and/or trailing edge triggering, when the trigger signal that triggers circuit 30 is generated is lasting high level or low level,
Control chip 40 judges that the voltage of power supply 200 keeps normal table, i.e. magnitude of voltage higher than lower limit separation 180V and is less than
Upper limit separation 240V, and control electromagnetic heating system to continue to output power；When the trigger signal that triggers circuit 30 is generated is in
When rising edge or trailing edge, control chip 40 judges that the voltage of power supply 200 is beyond predetermined voltage range, i.e. voltage jump
Low-voltage signal such as below 180V or voltage jump are high-voltage signal such as more than 240V, and control electromagnetic heating system to suspend
Heating suspends power output, and then control chip 40 detects the voltage change of power supply 200 again, when power supply 200
Fluctuation of the voltage in preset time be less than default fluctuation range, such as 5-10V then judges the voltage of power supply 200 again
Secondary stabilization, control chip 40 controls electromagnetic heating system power output again.
Thus, control chip 40 to voltage jump by detecting, it is possible to prevente effectively from electromagnetic heating system is worked in
High voltage low power or low pressure high power state, it is to avoid the switching tube excessively stream of electromagnetic heating system caused by abnormal current is hit
Wear, electromagnetic heating system can be protected when electric voltage exception is fluctuated, improve the reliability of system.
According to one embodiment of the present utility model, as shown in Fig. 2 voltage sampling circuit 10 includes：The He of rectification unit 101
Partial pressure unit 102, wherein, the input of rectification unit 101 is connected with power supply 200, and rectification unit 101 is used for power supply electricity
The alternating current that source 200 is provided carries out rectification；The input of partial pressure unit 102 is connected with the output end of rectification unit 101, partial pressure list
The output end of member 102 is connected with voltage conversion circuit 20, and partial pressure unit 102 is used to carry out partial pressure to the alternating current after rectification with life
Into voltage sampling signal.
According to one embodiment of the present utility model, as shown in Fig. 2 rectification unit 101 includes：First diode D1 and
Two diode D2, wherein, the first diode D1 anode is connected with the first end AC1 of power supply 200；Second diode D2's
Anode is connected with the second end AC2 of power supply 200, and the second diode D2 negative electrode is connected simultaneously with the first diode D1 negative electrode
With first node, first node is connected with the input of partial pressure unit 102.
According to one embodiment of the present utility model, as shown in Fig. 2 partial pressure unit 102 includes：The first electricity being sequentially connected in series
R1, second resistance R2 and 3rd resistor R3 are hindered, wherein, first resistor R1 one end is connected with first node, second resistance R2's
One end is connected with the first resistor R1 other end, and 3rd resistor R3 one end is connected with the second resistance R2 other end and has
Two nodes, 3rd resistor R3 other end ground connection, Section Point is connected with voltage conversion circuit 20.
According to one embodiment of the present utility model, as shown in Fig. 2 partial pressure unit 102 also includes：First electric capacity C1 and electricity
Solve electric capacity C10, the first electric capacity C1 in parallel with 3rd resistor R3；Electrochemical capacitor C10 is in parallel with the first electric capacity C1, electrochemical capacitor C10
Positive pole be connected with Section Point, electrochemical capacitor C10 negative pole ground connection.
Specifically, voltage sampling circuit 10 is mainly using electric resistance partial pressure, the method for capacitance voltage stabilizing to power supply 200
Voltage is sampled, and the alternating current that power supply 200 is provided exports d. c. voltage signal after the rectification of rectification unit 101, should
The magnitude of voltage of d. c. voltage signal is Vdc.And then, the first resistor R1, the second resistance R2 that are connected in series in partial pressure unit 102 and
3rd resistor R3 carries out partial pressure, the voltage V1=Vdc*R3/ (R1+R2+R3) at 3rd resistor R3 two ends, the to d. c. voltage signal
One electric capacity C1 and electrochemical capacitor C10 is filtered and voltage stabilizing processing to the voltage at 3rd resistor R3 two ends, and by filtering voltage regulation
Voltage sampling signal after reason is exported to voltage conversion circuit 20.
According to one embodiment of the present utility model, as shown in Fig. 2 voltage conversion circuit 20 includes：Operational amplifier
201st, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the second electric capacity C2, the 4th resistance R4 one end ground connection GND, the 4th
The resistance R4 other end is connected with the negative input end of operational amplifier 201；5th resistance R5 one end and voltage sampling circuit 10
It is connected, the 5th resistance R5 other end is connected with the positive input terminal of operational amplifier 201；Put with computing 6th resistance R6 one end
The positive input terminal of big device 201 is connected, and the 6th resistance R6 other end is connected with the output end of operational amplifier 201, operation amplifier
The output end of device 201 is connected with triggers circuit 30；Second electric capacity C2 one end is connected with the positive input terminal of operational amplifier 201,
Second electric capacity C2 other end ground connection GND.
Specifically, the 5th resistance R5 and the second electric capacity C2 the composition RC filter circuits of voltage conversion circuit 20, voltage becomes
Circuit 20 is changed after voltage sampling signal is received, voltage sampling signal is filtered, and filtered voltage sample is believed
The positive amplifying circuit that number output is constituted to operational amplifier 201, wherein, the magnification ratio of operational amplifier 201 is Av=1+
R6/R5, operational amplifier 201 is amplified processing to voltage sampling signal, and the voltage sampling signal after enhanced processing is defeated
Go out to triggers circuit 30.
According to one embodiment of the present utility model, as shown in Fig. 2 triggers circuit 30 is fixed including 555 timers 301,555
When device 301 the first pin 1 ground connection GND, the crus secundas 2 of 555 timers 301 is connected afterwards and voltage conversion circuit 20 with the 6th pin 6
It is connected, the 3rd pin 3 of 555 timers 301 is connected with control chip 40, and the 4th pin 4 of 555 timers 301 is connected with octal 8
It is connected afterwards with the first default power supply VCC1, the 7th pin 7 of 555 timers 301 presets power supply by the 7th resistance R7 and second
VCC2 is connected.
Specifically, 555 timers 301 may make up Schmidt trigger, according to the characteristics of 555 timer, triggers circuit
30 have upper limit threshold voltage VT+With lower threshold voltage VT-, when triggers circuit 30 input signal magnitude of voltage from less than upper
Limit threshold voltage VT+It is mutated more than upper limit threshold voltage VT+Or from higher than lower threshold voltage VT-It is mutated less than lower limit threshold
Threshold voltage VT-When, the trigger signal that triggers circuit 30 is generated is overturn.
It should be noted that voltage conversion circuit 20 can be used for the voltage difference of matching voltage sampled signal and Schmidt to touch
The relation between the hysteresis voltage (difference i.e. between upper limit threshold voltage and lower threshold voltage) of device is sent out, so that triggers circuit
30 upper limit threshold voltage VT+The upper limit separation such as 240V of correspondence predetermined voltage range, and make the lower limit threshold of triggers circuit 30
Threshold voltage VT-The lower limit separation such as 180V of correspondence predetermined voltage range.
In a specific embodiment of the present utility model, it is assumed that voltage sampling circuit 10 uses+5V as reference voltage
Partial pressure sampling is carried out, by taking a certain dividing ratios as an example, the concrete operating principle of the protection device of the utility model embodiment is as follows：
When the magnitude of voltage for the alternating current that power supply 200 is provided is 180V, the voltage that voltage sampling circuit 10 is generated is adopted
The AD sampled values of sample signal are 80 (hexadecimal numbers), and corresponding decimal number is 128；The exchange provided when power supply 200
When the magnitude of voltage of electricity is 240V, the AD sampled values for the voltage sampling signal that voltage sampling circuit 10 is generated are 9D (hexadecimals
Number), corresponding decimal number is 157, and both corresponding voltage differences are 5* (157-128)/255=0.568.It is fixed according to 555
When device composition Schmidt trigger operation principle, the upper limit threshold voltage of triggers circuit 30Lower threshold
VoltageHysteresis voltage isIn embodiment of the present utility model, the first default power supply VCC1 voltage
It is worth for+5V, the hysteresis voltage of triggers circuit 30 isAccordingly, it would be desirable to adjust the amplification ratio of voltage conversion circuit 20
Example, between the voltage difference of voltage sampling signal and the hysteresis voltage of triggers circuit 30 that are generated with matching voltage sample circuit 10
Proportionate relationship, wherein, the magnification ratio Av=1.67/0.568=2.93 of the operational amplifier 201 of voltage conversion circuit 20.
Further, according to the characteristics of 555 timer 301, voltage sampling signal after transformation is from 555 timers 301
Crus secunda 2 input, and the voltage sampling signal after transformation magnitude of voltage from less thanIt is mutated and exceedesWhen, 555
The 3rd pin 3 output trailing edge trigger signal of timer 301；Voltage sampling signal after transformation is from the of 555 timers 301
Two pin 2 are inputted, and the voltage sampling signal after transformation magnitude of voltage from higher thanIt is mutated and is less thanWhen, 555 determine
When device 301 the 3rd pin 3 output rising edge trigger signal.So, when the voltage reduction of power supply 200, voltage sample electricity
The voltage sampling signal that road 10 is generated drops to low pressure from high pressure, and voltage conversion circuit 20 is carried out at transformation to voltage sampling signal
Reason, if the magnitude of voltage of the voltage sampling signal after transformation reaches lower threshold voltage VT-I.e.Then triggers circuit 30 is given birth to
Into trigger signal overturn, and produce a rising edge signal；When the voltage rise of power supply 200, voltage sample
The voltage sampling signal that circuit 10 is generated rises to high pressure from low pressure, and voltage conversion circuit 20 carries out transformation to voltage sampling signal
Processing, if the magnitude of voltage of the voltage sampling signal after transformation reaches upper limit threshold voltage VT+I.e.Then triggers circuit 30
The trigger signal of generation is overturn, and produces a trailing edge signal.
In a specific embodiment of the present utility model, according to the difference of upset point, rational predeterminated voltage model is set
Enclose and the reasonably trigger point of Schmidt trigger, and adjust the magnification ratio of voltage conversion circuit 20, so that predeterminated voltage
The upper limit separation of scope such as 240V corresponding voltages value isTrailing edge upset point；And make predetermined voltage range
Lower limit separation such as 180V corresponding voltages value beRising edge upset point.So, triggers circuit 30 can root
Trigger signal is generated according to the voltage detection signal after transformation.
According to a specific embodiment of the present utility model, voltage sampling circuit 10 is carried out to the voltage of power supply 200
Sampling, and obtain the AD sampled values of voltage sampling signal, if in preset time the AD sampled values of voltage sampling signal ripple
Dynamic scope is less than 5 AD points, then illustrates that fluctuation of the voltage of power supply 200 in preset time is less than default fluctuation range,
Such as 5-10V, now, control chip 40 can determine whether that the voltage of power supply 200 is stablized again, and control electromagnetic heating system weight
New power output.
According to one embodiment of the present utility model, as shown in Fig. 2 electromagnetic heating system includes resonance heating unit 300
With rectification filtering module 400, wherein, rectification filtering module 400 include rectification module 401 and filtration module 402, rectification module
401 first input end is connected with the first end AC1 of power supply 200, the second input and power supply of rectification module 401
200 the second end AC2 is connected, and the first output end of rectification module 401 is connected with the first end of filtration module 402, rectification module
401 the second output end is grounded GND after being connected with the 3rd end of filtration module 402.Resonance heating unit 300 is managed including IGBT
(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) the 310 and resonant capacitance C0 of parallel connection
It is connected with heating coil L0, resonant capacitance C0 and heating coil L0 one end in parallel with the second end of filtration module 402, it is in parallel
Resonant capacitance C0 and the heating coil L0 other ends be extremely connected with the C of IGBT pipes 310, the E poles of IGBT pipes 310 ground connection GND, IGBT
The G poles of pipe 310 are connected with control chip 40.
Specifically, rectification filtering module 400 is used to carry out rectifying and wave-filtering to the alternating current that power supply 200 is provided, with
Galvanic current source is provided for resonance heating unit 300, resonance heating unit 300 is under the control of control chip 40 by electric energy
It is converted into heat energy.
As described above, in the utility model embodiment, according to the characteristics of Schmidt trigger, setting rational default electricity
Press the trigger point of scope and rational Schmidt trigger.In the course of work of electromagnetic heating system, power supply 200 is
Resonance heating unit 300 is powered, meanwhile, voltage sampling circuit 10 carries out real-time sampling to the voltage of power supply 200, and voltage becomes
Change circuit 20 and transformation processing is carried out to voltage sampling signal, and then, triggers circuit 30 is given birth to according to the voltage sampling signal after transformation
Into trigger signal.When the trigger signal that control chip 40 is received is lasting high level or low level, control chip 40 is sentenced
The voltage of disconnected power supply 200 keeps normal table, and sends pulse control signal control IGBT pipes 301 and be switched on or off, with
Control electromagnetic heating system continues to output power；When control chip 40 receives the trigger signal of rising edge or trailing edge, control
Coremaking piece 40 judges that the voltage of power supply 200 exceeds predetermined voltage range, and stops exporting pulse control signal, to control electricity
Magnetic heating system pause heating i.e. pause power output, and the voltage change of power supply 200 is detected again, work as power supply
Fluctuation of 200 voltage in preset time is less than default fluctuation range, then judges that the voltage of power supply 200 is stablized again,
Control chip 40 controls electromagnetic heating system power output again.
To sum up, the protection device of the electromagnetic heating system proposed according to the utility model embodiment, voltage sampling circuit root
Voltage sampling signal is generated according to the voltage of power supply, voltage conversion circuit carries out transformation processing, triggering to voltage sampling signal
Circuit generates trigger signal according to the voltage sampling signal after transformation, and then, control chip judges power supply electricity according to trigger signal
Whether the voltage in source exceeds predetermined voltage range, and control electromagnetic heating system stops when judging that voltage exceeds predetermined voltage range
Only heat.Thus, the protection device of the electromagnetic heating system of the utility model embodiment, can by being detected to voltage jump
To be prevented effectively from electromagnetic heating system work in high voltage low power or low pressure high power state, it is to avoid caused by abnormal current
The switching tube excessively stream of electromagnetic heating system punctures, and electromagnetic heating system can be protected when electric voltage exception is fluctuated, and improves
The reliability of system.
Fig. 3 is the block diagram of the electromagnetic heating system according to the utility model embodiment.As shown in figure 3, the electromagnetism
Heating system 50 includes the protection device 100 of electromagnetic heating system.
To sum up, the electromagnetic heating system proposed according to the utility model embodiment, passes through the guarantor of above-mentioned electromagnetic heating system
Protection unit, is detected to voltage jump, it is possible to prevente effectively from electromagnetic heating system works in high voltage low power or low pressure is high
Power rating, it is to avoid the switching tube excessively stream of electromagnetic heating system caused by abnormal current punctures, and can be fluctuated in electric voltage exception
When electromagnetic heating system is protected, improve the reliability of system.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " suitable
The orientation or position relationship of the instruction such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " are based on orientation shown in the drawings
Or position relationship, be for only for ease of description the utility model and simplify and describe, rather than indicate or imply signified device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limit of the present utility model
System.
In addition, 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, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two
It is individual, three etc., unless otherwise specifically defined.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. term should be interpreted broadly, 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, can also be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the common skill of this area
For art personnel, concrete meaning of the 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 is "above" or "below" second feature
Can be that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, first is special
Levy 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 ", " lower section " and " below " can be with
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height 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. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term
State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with
Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area
Technical staff the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification can be entered
Row is combined and combined.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in scope of the present utility model
It is interior above-described embodiment to be changed, changed, replaced and modification.
Claims (10)
1. a kind of protection device of electromagnetic heating system, it is characterised in that including：
Voltage sampling circuit, the voltage sampling circuit is connected with power supply, and the voltage sampling circuit is used for according to described
The voltage generation voltage sampling signal of power supply, wherein, the power supply is used to power for the electromagnetic heating system；
Voltage conversion circuit, the voltage conversion circuit is connected with the voltage sampling circuit, and the voltage conversion circuit is used for
Transformation processing is carried out to the voltage sampling signal；
Triggers circuit, the triggers circuit is connected with the voltage conversion circuit, after the triggers circuit is used for according to transformation
Voltage sampling signal generates trigger signal；
Control chip, the control chip is connected with the triggers circuit, and the control chip is used to believe according to the triggering
Number judge to control the electromagnetic heating system to stop heating when the voltage of the power supply exceeds predetermined voltage range.
2. the protection device of electromagnetic heating system according to claim 1, it is characterised in that the voltage sampling circuit bag
Include：
Rectification unit, the input of the rectification unit is connected with the power supply, and the rectification unit is used to supply described
The alternating current that power supply is provided carries out rectification；
Partial pressure unit, the input of the partial pressure unit is connected with the output end of the rectification unit, the partial pressure unit it is defeated
Go out end with the voltage conversion circuit to be connected, the partial pressure unit is used for described to generate to the alternating current progress partial pressure after rectification
Voltage sampling signal.
3. the protection device of electromagnetic heating system according to claim 2, it is characterised in that the rectification unit includes：
First diode, the anode of first diode is connected with the first end of the power supply；
Second diode, the anode of second diode is connected with the second end of the power supply, second diode
Negative electrode be connected with the negative electrode of first diode and there is first node, the first node is defeated with the partial pressure unit
Enter end to be connected.
4. the protection device of electromagnetic heating system according to claim 3, it is characterised in that the partial pressure unit includes：
First resistor, second resistance and the 3rd resistor being sequentially connected in series, one end of the first resistor and the first node phase
Even, one end of the second resistance is connected with the other end of the first resistor, one end of the 3rd resistor and described second
The other end of resistance is connected and has Section Point, and the other end of the 3rd resistor is grounded, the Section Point and the electricity
Translation circuit is pressed to be connected.
5. the protection device of electromagnetic heating system according to claim 4, it is characterised in that the partial pressure unit is also wrapped
Include：
First electric capacity, first electric capacity is in parallel with the 3rd resistor；
Electrochemical capacitor, the electrochemical capacitor is in parallel with first electric capacity.
6. the protection device of electromagnetic heating system according to claim 1, it is characterised in that the voltage conversion circuit bag
Include：
Operational amplifier；
4th resistance, one end ground connection of the 4th resistance, the other end of the 4th resistance and bearing for the operational amplifier
Input is connected；
5th resistance, one end of the 5th resistance is connected with the voltage sampling circuit, the other end of the 5th resistance with
The positive input terminal of the operational amplifier is connected；
6th resistance, one end of the 6th resistance is connected with the positive input terminal of the operational amplifier, the 6th resistance
The other end is connected with the output end of the operational amplifier, and the output end of the operational amplifier is connected with the triggers circuit；
Second electric capacity, one end of second electric capacity is connected with the positive input terminal of the operational amplifier, second electric capacity
The other end is grounded.
7. the protection device of electromagnetic heating system according to claim 1, it is characterised in that the triggers circuit includes
555 timers, the first pin ground connection of 555 timer, the crus secunda of 555 timer be connected with the 6th pin afterwards with it is described
Voltage conversion circuit is connected, and the 3rd pin of 555 timer is connected with the control chip, and the 4th of 555 timer the
Pin is connected after being connected with octal with the first default power supply, and the 7th pin of 555 timer is pre- by the 7th resistance and second
If voltage is connected.
8. the protection device of the electromagnetic heating system according to claim 1 or 7, it is characterised in that the control chip exists
The trigger signal judges that the voltage of the power supply exceeds the predetermined voltage range when being in rising edge or trailing edge.
9. the protection device of electromagnetic heating system according to claim 8, it is characterised in that the predetermined voltage range
Upper limit separation is 240V, and the lower limit separation of the predetermined voltage range is 180V.
10. a kind of electromagnetic heating system, it is characterised in that including the Electromagnetic Heating according to any one of claim 1-9
The protection device of system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621383250.9U CN206353870U (en) | 2016-12-15 | 2016-12-15 | Electromagnetic heating system and its protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621383250.9U CN206353870U (en) | 2016-12-15 | 2016-12-15 | Electromagnetic heating system and its protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206353870U true CN206353870U (en) | 2017-07-25 |
Family
ID=59348014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621383250.9U Expired - Fee Related CN206353870U (en) | 2016-12-15 | 2016-12-15 | Electromagnetic heating system and its protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206353870U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108235480A (en) * | 2016-12-15 | 2018-06-29 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its protective device |
| CN108377587A (en) * | 2018-01-15 | 2018-08-07 | 浙江绍兴苏泊尔生活电器有限公司 | Power control method and device and electromagnetic heating equipment |
| CN109561518A (en) * | 2017-09-25 | 2019-04-02 | 佛山市顺德区美的电热电器制造有限公司 | Heating control apparatus and cooking apparatus |
-
2016
- 2016-12-15 CN CN201621383250.9U patent/CN206353870U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108235480A (en) * | 2016-12-15 | 2018-06-29 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its protective device |
| CN108235480B (en) * | 2016-12-15 | 2024-07-05 | 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 |
| CN109561518A (en) * | 2017-09-25 | 2019-04-02 | 佛山市顺德区美的电热电器制造有限公司 | Heating control apparatus and cooking apparatus |
| CN109561518B (en) * | 2017-09-25 | 2023-02-24 | 佛山市顺德区美的电热电器制造有限公司 | Heating control device and cooking utensil |
| CN108377587A (en) * | 2018-01-15 | 2018-08-07 | 浙江绍兴苏泊尔生活电器有限公司 | Power control method and device and electromagnetic heating equipment |
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Granted publication date: 20170725 Termination date: 20211215 |