CN108235480A - Electromagnetic heating system and its protective device - Google Patents
Electromagnetic heating system and its protective device Download PDFInfo
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- CN108235480A CN108235480A CN201611162228.6A CN201611162228A CN108235480A CN 108235480 A CN108235480 A CN 108235480A CN 201611162228 A CN201611162228 A CN 201611162228A CN 108235480 A CN108235480 A CN 108235480A
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- voltage
- heating system
- electromagnetic heating
- power supply
- circuit
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/02—Induction heating
Abstract
The invention discloses a kind of electromagnetic heating system and its protective device, which includes：Voltage sampling circuit is connected with power supply, 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 is connected with voltage sampling circuit, is used to carry out transformation processing to voltage sampling signal；Trigger circuit is connected with voltage conversion circuit, is used to generate trigger signal according to the voltage sampling signal after transformation；Chip is controlled, is connected with trigger circuit, the control electromagnetic heating system when the voltage that power supply is judged according to trigger signal exceeds predetermined voltage range is used for and stops heating.The embodiment of the present invention is by being detected voltage jump; it is possible to prevente effectively from electromagnetic heating system works in high voltage low power or low pressure high power state; the switching tube overcurrent breakdown of electromagnetic heating system caused by avoiding abnormal current, and protected when electric voltage exception fluctuates.
Description
Technical field
The present invention relates to household electrical appliance technical field, the protective device of more particularly to a kind of electromagnetic heating system and a kind of electricity
Magnetic 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 the size of chip controls pulse signal is controlled to depend on the sample voltage value of actual circuit.But in heating process often
The phenomenon that will appear the voltage fluctuation of power supply, and the power regulation of chip is controlled to need one section of reaction time, it is therefore, related
There are following two shortcomings for 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 is mutated from low pressure to high pressure, then will appear high voltage low power heating transient process, at this point, the IGBT plumbers of electromagnetic heating system
Make in high pressure opening state, there are the risks of overcurrent breakdown.
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 will appear low pressure high power heating transient process, at this point, the IGBT plumbers of electromagnetic heating system
Make in serious hysteretic state, to equally exist the risk that overcurrent punctures.
Therefore, the relevant technologies needs are improved.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
One purpose is to propose a kind of protective device of electromagnetic heating system, which can add electromagnetism when electric voltage exception fluctuates
Hot systems are protected.
It is another object of the present invention to propose a kind of electromagnetic heating system.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of protective device of electromagnetic heating system, packet
It includes：Voltage sampling circuit, the voltage sampling circuit are connected with power supply, and the voltage sampling circuit is used for according to the confession
The voltage generation voltage sampling signal of power supply, wherein, the power supply is used to power for the electromagnetic heating system；Voltage
Translation circuit, the voltage conversion circuit are connected with the voltage sampling circuit, and the voltage conversion circuit is used for the electricity
Sampled signal is pressed to carry out transformation processing；Trigger circuit, the trigger circuit are connected with the voltage conversion circuit, the triggering electricity
Road is used to generate trigger signal according to the voltage sampling signal after transformation；Control chip, the control chip and the triggering electricity
Road is connected, and the control chip is used to exceed predeterminated voltage model in the voltage for judging the power supply according to the trigger signal
The electromagnetic heating system is controlled to stop heating when enclosing.
The protective device of the electromagnetic heating system proposed according to embodiments of the present invention, voltage sampling circuit is according to power supply
Voltage generation voltage sampling signal, voltage conversion circuit to voltage sampling signal carry out transformation processing, trigger circuit is according to change
Voltage sampling signal generation trigger signal after pressure, and then, control chip judges that the voltage of power supply is according to trigger signal
It is no to exceed predetermined voltage range, and control electromagnetic heating system stops heating when judging that voltage exceeds predetermined voltage range.By
This, the protective device of the electromagnetic heating system of the embodiment of the present invention is by being detected voltage jump, it is possible to prevente effectively from electric
Magnetic heating system works in high voltage low power or low pressure high power state, avoids electromagnetic heating system caused by abnormal current
Switching tube overcurrent breakdown, electromagnetic heating system can be protected when electric voltage exception fluctuates, improve the reliable of system
Property.
According to one embodiment of present invention, the voltage sampling circuit includes：Rectification unit, the rectification unit it is defeated
Enter end with the power supply to be connected, the rectification unit is used to carry out rectification to the alternating current that the power supply provides；Point
Press unit, the input terminal of the partial pressure unit is connected with the output terminal of the rectification unit, the output terminal of the partial pressure unit and
The voltage conversion circuit is connected, and the partial pressure unit is adopted for being divided to the alternating current after rectification with generating the voltage
Sample signal.
According to one embodiment of present invention, the rectification unit includes：First diode, the sun of first diode
Pole is connected with the first end of the power supply；Second diode, anode and the power supply of second diode
Second end is connected, and the cathode of second diode is connected with the cathode of first diode and has first node, described
First node is connected with the input terminal of the partial pressure unit.
According to one embodiment of present invention, the partial pressure unit includes：The first resistor that is sequentially connected in series, second resistance and
3rd resistor, one end of the first resistor are connected with the first node, one end of the second resistance and the described first electricity
The other end of resistance is connected, and one end of the 3rd resistor is connected with the other end of the second resistance and has second node, institute
The other end ground connection of 3rd resistor is stated, the second node is connected with the voltage conversion circuit.
According to one embodiment of present invention, the partial pressure unit further includes：First capacitance, first capacitance with it is described
3rd resistor is in parallel；Electrolytic capacitor, the electrolytic capacitor are in parallel with first capacitance.
According to one embodiment of present invention, the voltage conversion circuit includes：Operational amplifier；4th resistance, it is described
One end ground connection of 4th resistance, the other end of the 4th resistance are connected with the negative input end of the operational amplifier；5th electricity
Resistance, one end of the 5th resistance are connected with the voltage sampling circuit, and the other end of the 5th resistance is put with the operation
The positive input terminal of big device is connected；6th resistance, one end of the 6th resistance are connected with the positive input terminal of the operational amplifier,
The other end of 6th resistance is connected with the output terminal of the operational amplifier, the output terminal of the operational amplifier with it is described
Trigger circuit is connected；Second capacitance, one end of second capacitance are connected with the positive input terminal of the operational amplifier, and described
The other end ground connection of two capacitances.
According to one embodiment of present invention, the trigger circuit include 555 timers, the first of 555 timer
Foot is grounded, and the crus secunda of 555 timer is connected after being connected with the 6th foot with the voltage conversion circuit, and described 555 periodically
The third foot of device is connected with the control chip, the 4th foot of 555 timer be connected with octal after with it is first default electric
Source is connected, and the 7th foot of 555 timer is connected by the 7th resistance with the second predeterminated voltage.
According to one embodiment of present invention, the control chip is when the trigger signal is in rising edge or failing edge
Judge that the voltage of the power supply exceeds the predetermined voltage range.
A specific embodiment according to the present invention, the upper limit separation of the predetermined voltage range can be 240V, described
The lower limit separation of predetermined voltage range can be 180V.
In order to achieve the above objectives, a kind of electromagnetic heating system that another aspect of the present invention embodiment proposes, including the reality
Apply the protective device of the electromagnetic heating system of example.
The electromagnetic heating system proposed according to embodiments of the present invention, it is right by the protective device of above-mentioned electromagnetic heating system
Voltage jump is detected, it is possible to prevente effectively from electromagnetic heating system works in high voltage low power or low pressure high power state,
The switching tube overcurrent breakdown of electromagnetic heating system caused by avoiding abnormal current, can add electromagnetism when electric voltage exception fluctuates
Hot systems are protected, and improve the reliability of system.
Description of the drawings
Fig. 1 is the block diagram of the protective device of electromagnetic heating system according to embodiments of the present invention；
Fig. 2 is the circuit diagram of the protective device of electromagnetic heating system according to an embodiment of the invention；And
Fig. 3 is the block diagram of electromagnetic heating system according to embodiments of the present invention.
Reference numeral：
Protective 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, trigger 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 capacitance C1 and electrolytic capacitor C10；
Operational amplifier 201, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the second capacitance C2；
555 timers 301 and the 7th resistance R7；Rectification module 401 and filter module 402.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings come describe the embodiment of the present invention proposition electromagnetic heating system and its protective device.
Fig. 1 is the block diagram of the protective device of electromagnetic heating system according to embodiments of the present invention.As shown in Figure 1,
The protective device 100 of electromagnetic heating system includes：Voltage sampling circuit 10, voltage conversion circuit 20, trigger circuit 30 and control
Chip 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；Trigger circuit
30 are connected with voltage conversion circuit 20, and trigger circuit 30 is used to generate trigger signal according to the voltage sampling signal after transformation；Control
Coremaking piece 40 is connected with trigger circuit 30, and control chip 40 is used to judge that the voltage of power supply 200 surpasses 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 10 real-time sampling power supply 200 of voltage sampling circuit simultaneously generates voltage sampling signal, and voltage conversion circuit 20 is right
Voltage sampling signal carries out transformation processing, so that the voltage sampling signal after transformation matches with trigger circuit 30.In triggering electricity
After road 30 receives the voltage sampling signal after transformation, if the level for the trigger signal that trigger circuit 30 exports remains unchanged example
Such as in high level or low level, control chip 40 then judges the voltage of power supply 200 without departing from predetermined voltage range, and controls
Electromagnetic heating system processed continues power output；If the trigger signal that trigger circuit 30 exports is overturn, core is controlled
Piece 40 judges the voltage of power supply 200 beyond predetermined voltage range, and electromagnetic heating system is controlled to stop heating, and examine 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
It encloses, then judges that the voltage of power supply 200 is stablized again, control chip 40 controls electromagnetic heating system output power again.
According to one embodiment of present invention, control chip 40 judges to supply when trigger signal is in rising edge or failing edge
The voltage of power supply 200 exceeds predetermined voltage range.
A specific embodiment according to the present invention, the upper limit separation of predetermined voltage range can be 240V, predeterminated voltage
The lower limit separation of 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 an embodiment of the present invention, the external interrupt type of setting control chip 40 is for two-way edging trigger
Rising edge and/or failing edge triggering, when the trigger signal that trigger circuit 30 generates is lasting high level or low level, control
Chip 40 judges that the voltage of power supply 200 keeps normal table, i.e., voltage value is higher than lower limit separation 180V and less than the upper limit
Separation 240V, and electromagnetic heating system is controlled to continue to output power；Rise when the trigger signal that trigger circuit 30 generates is in
When edge or failing edge, control chip 40 judges the voltage of power supply 200 beyond predetermined voltage range, i.e. voltage jump is low pressure
Signal such as below 180V or voltage jump are high-voltage signal such as more than 240V, and control electromagnetic heating system pause heating
Suspend output power, chip 40 is then controlled to detect the voltage change of power supply 200 again, when the electricity of power supply 200
The fluctuation being pressed in preset time is less than default fluctuation range, such as 5-10V, then judges that the voltage of power supply 200 is steady again
Fixed, control chip 40 controls electromagnetic heating system output power again.
Control chip 40 is by being detected voltage jump as a result, it is possible to prevente effectively from electromagnetic heating system works in
High voltage low power or low pressure high power state, the switching tube overcurrent of electromagnetic heating system caused by avoiding abnormal current are hit
It wears, electromagnetic heating system can be protected when electric voltage exception fluctuates, improve the reliability of system.
According to one embodiment of present invention, as shown in Fig. 2, voltage sampling circuit 10 includes：Rectification unit 101 and partial pressure
Unit 102, wherein, the input terminal of rectification unit 101 is connected with power supply 200, and rectification unit 101 is used for power supply
200 alternating currents provided carry out rectification；The input terminal of partial pressure unit 102 is connected with the output terminal of rectification unit 101, partial pressure unit
102 output terminal is connected with voltage conversion circuit 20, and partial pressure unit 102 is used to that the alternating current after rectification to be divided to generate
Voltage sampling signal.
According to one embodiment of present invention, as shown in Fig. 2, rectification unit 101 includes：First diode D1 and the two or two
Pole pipe D2, wherein, the anode of the first diode D1 is connected with the first end AC1 of power supply 200；The anode of second diode D2
It is connected with the second end AC2 of power supply 200, the cathode of the second diode D2 is connected and has with the cathode of the first diode D1
First node, first node are connected with the input terminal of partial pressure unit 102.
According to one embodiment of present invention, as shown in Fig. 2, partial pressure unit 102 includes：The first resistor being sequentially connected in series
R1, second resistance R2 and 3rd resistor R3, wherein, one end of first resistor R1 is connected with first node, and the one of second resistance R2
End is connected with the other end of first resistor R1, and one end of 3rd resistor R3 is connected with the other end of second resistance R2 and has second
Node, the other end ground connection of 3rd resistor R3, second node are connected with voltage conversion circuit 20.
According to one embodiment of present invention, as shown in Fig. 2, partial pressure unit 102 further includes：First capacitance C1 and electrolysis electricity
Hold C10, the first capacitance C1 is in parallel with 3rd resistor R3；Electrolytic capacitor C10 is in parallel with the first capacitance C1, and electrolytic capacitor C10 is just
Pole is connected with second node, the cathode ground connection of electrolytic capacitor C10.
Specifically, voltage sampling circuit 10 mainly uses the method for electric resistance partial pressure, capacitance voltage stabilizing to power supply 200
Voltage is sampled, and the alternating current that power supply 200 provides exports d. c. voltage signal after 101 rectification of rectification unit, should
The voltage value 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 divides d. c. voltage signal, the voltage V1=Vdc*R3/ (R1+R2+R3) at 3rd resistor R3 both ends, the
The voltage at 3rd resistor R3 both ends is filtered one capacitance C1 and electrolytic capacitor C10 and voltage stabilizing processing, and will be at filtering voltage regulation
Voltage sampling signal after reason is exported to voltage conversion circuit 20.
According to one embodiment of present invention, as shown in Fig. 2, voltage conversion circuit 20 includes：Operational amplifier 201,
Four resistance R4, the 5th resistance R5, the 6th resistance R6 and the second capacitance C2, one end the ground connection GND, the 4th resistance R4 of the 4th resistance R4
The other end be connected with the negative input end of operational amplifier 201；One end of 5th resistance R5 is connected with voltage sampling circuit 10, the
The other end of five resistance R5 is connected with the positive input terminal of operational amplifier 201；One end of 6th resistance R6 and operational amplifier 201
Positive input terminal be connected, the other end of the 6th resistance R6 is connected with the output terminal of operational amplifier 201, operational amplifier 201
Output terminal is connected with trigger circuit 30；One end of second capacitance C2 is connected with the positive input terminal of operational amplifier 201, the second capacitance
The other end ground connection GND of C2.
Specifically, the 5th resistance R5 and the second capacitance C2 the composition RC filter circuits of voltage conversion circuit 20, voltage become
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 form to operational amplifier 201, wherein, the magnification ratio of operational amplifier 201 is Av=1+
R6/R5, operational amplifier 201 are amplified voltage sampling signal processing, and the voltage sampling signal after enhanced processing is defeated
Go out to trigger circuit 30.
According to one embodiment of present invention, as shown in Fig. 2, trigger circuit 30 includes 555 timer, 301,555 timer
301 the first foot 1 ground connection GND, the crus secunda 2 of 555 timers 301 is connected with the 6th foot 6 to be connected afterwards with voltage conversion circuit 20,
The third foot 3 of 555 timers 301 is connected with control chip 40, the 4th foot 4 of 555 timers 301 be connected with octal 8 afterwards and
First default power supply VCC1 is connected, and the 7th foot 7 of 555 timers 301 passes through the 7th resistance R7 and the second default power supply VCC2 phases
Even.
Specifically, 555 timers 301 may make up Schmidt trigger, according to the characteristics of 555 timer, trigger circuit
30 have upper limit threshold voltage VT+With lower threshold voltage VT-, when trigger circuit 30 input signal voltage value 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 trigger circuit 30 generates 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 relationship between the hysteresis voltage (difference i.e. between upper limit threshold voltage and lower threshold voltage) of device is sent out, so that trigger circuit
30 upper limit threshold voltage VT+The upper limit separation such as 240V of corresponding predetermined voltage range, and make the lower limit threshold of trigger circuit 30
Threshold voltage VT-The lower limit separation such as 180V of corresponding predetermined voltage range.
In one particular embodiment of the present invention, it is assumed that voltage sampling circuit 10 uses+5V to be carried out as reference voltage
Partial pressure sampling, by taking a certain dividing ratios as an example, the concrete operating principle of the protective device of the embodiment of the present invention is as follows：
When the voltage value for the alternating current that power supply 200 provides is 180V, the voltage that voltage sampling circuit 10 generates is adopted
The AD sampled values of sample signal are 80 (hexadecimal numbers), and corresponding decimal number is 128；When the exchange that power supply 200 provides
When the voltage value of electricity is 240V, the AD sampled values for the voltage sampling signal that voltage sampling circuit 10 generates are 9D (hexadecimals
Number), corresponding decimal number is 157, and the corresponding voltage difference of the two is 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 trigger circuit 30Lower threshold
VoltageHysteresis voltage isIn an embodiment of the present invention, the voltage value of the first default power supply VCC1 is
+ 5V, the hysteresis voltage of trigger circuit 30 areTherefore, it is necessary to adjust the magnification ratio of voltage conversion circuit 20,
Between the voltage difference of voltage sampling signal and the hysteresis voltage of trigger 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 value of the voltage sampling signal after transformation from less thanIt is mutated and is more thanWhen,
The third foot 3 of 555 timers 301 exports failing edge trigger signal；Voltage sampling signal after transformation is from 555 timers 301
Crus secunda 2 input, and the voltage value of the voltage sampling signal after transformation from higher thanIt is mutated and is less thanWhen, 555
The third foot 3 of timer 301 exports rising edge trigger signal.In this way, when the voltage of power supply 200 reduces, voltage sample
The voltage sampling signal that circuit 10 generates drops to low pressure from high pressure, and voltage conversion circuit 20 carries out transformation to voltage sampling signal
Processing, if the voltage value of the voltage sampling signal after transformation reaches lower threshold voltage VT-I.e.Then trigger circuit 30
The trigger signal of generation is overturn, and generates a rising edge signal；When the voltage raising of power supply 200, voltage is adopted
The voltage sampling signal that sample circuit 10 generates rises to high pressure from low pressure, and voltage conversion circuit 20 becomes voltage sampling signal
Pressure processing, if the voltage value of the voltage sampling signal after transformation reaches upper limit threshold voltage VT+I.e.Then trigger circuit
The trigger signal of 30 generations is overturn, and generates a failing edge signal.
In one particular embodiment of the present invention, according to overturning point difference, set rational predetermined voltage range with
And the trigger point of rational Schmidt trigger, and the magnification ratio of voltage conversion circuit 20 is adjusted, so that predetermined voltage range
Upper limit separation such as 240V corresponding voltages value beFailing edge overturning point；And make under predetermined voltage range
Limiting separation such as 180V corresponding voltages value isRising edge overturning point.In this way, trigger circuit 30 can basis
Voltage detection signal generation trigger signal after transformation.
A specific embodiment according to the present invention, voltage sampling circuit 10 sample the voltage of power supply 200,
And obtain the AD sampled values of voltage sampling signal, if in preset time the AD sampled values of voltage sampling signal fluctuation range
Less than 5 AD points then illustrate that fluctuation of the voltage of power supply 200 in preset time is less than default fluctuation range, such as 5-
10V, at this point, control chip 40 can determine whether that the voltage of power supply 200 is stablized again, and electromagnetic heating system is controlled to export again
Power.
According to one embodiment of present invention, as shown in Fig. 2, electromagnetic heating system includes resonance heating unit 300 and whole
Filter module 400 is flowed, wherein, rectification filtering module 400 includes rectification module 401 and filter module 402, rectification module 401
First input end is connected with the first end AC1 of power supply 200, the second input terminal and the power supply 200 of rectification module 401
Second end AC2 is connected, and the first output terminal of rectification module 401 is connected with the first end of filter module 402, rectification module 401
Second output terminal is grounded GND after being connected with the third end of filter module 402.Resonance heating unit 300 is managed including IGBT
(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) 310 and the resonant capacitance C0 of parallel connection
It is connected with one end of heating coil L0, resonant capacitance C0 in parallel and heating coil L0 with the second end of filter 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 provides, with
Stable DC 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 thermal energy.
As described above, in embodiments of the present invention, according to the characteristics of Schmidt trigger, rational predeterminated voltage model is set
It encloses and the trigger point of 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 the voltage of power supply 200 real-time sampling, voltage transformation electricity
Road 20 carries out voltage sampling signal transformation processing, and then, trigger circuit 30 is generated according to the voltage sampling signal after transformation and is touched
It signals.When controlling the trigger signal that chip 40 receives for lasting high level or low level, control chip 40 judges to supply
The voltage of power supply 200 keeps normal table, and sends out pulse control signal control IGBT pipes 301 and be switched on or off, with control
Electromagnetic heating system continues to output power；When chip 40 is controlled to receive the trigger signal of rising edge or failing edge, core is controlled
Piece 40 judges the voltage of power supply 200 beyond predetermined voltage range, and stops exporting pulse control signal, electromagnetism to be controlled to add
Hot systems pause heating i.e. pause output power, and the voltage change of power supply 200 is detected again, when power supply 200
Fluctuation of the voltage in preset time is less than default fluctuation range, then judges that the voltage of power supply 200 is stablized again, controls core
Piece 40 controls electromagnetic heating system output power again.
To sum up, the protective device of the electromagnetic heating system proposed according to embodiments of the present invention, voltage sampling circuit is according to confession
The voltage generation voltage sampling signal of power supply, voltage conversion circuit carry out transformation processing, trigger circuit to voltage sampling signal
Trigger signal is generated according to the voltage sampling signal after transformation, and then, control chip judges power supply according to trigger signal
Whether voltage is beyond predetermined voltage range, and control electromagnetic heating system stops adding when judging that voltage exceeds predetermined voltage range
Heat.The protective device of the electromagnetic heating system of the embodiment of the present invention can effectively be kept away by being detected to voltage jump as a result,
Exempt from electromagnetic heating system and work in high voltage low power or low pressure high power state, avoid electromagnetic heating caused by abnormal current
The switching tube overcurrent breakdown of system, can protect electromagnetic heating system when electric voltage exception fluctuates, improve system
Reliability.
Fig. 3 is the block diagram of electromagnetic heating system according to embodiments of the present invention.As shown in figure 3, the electromagnetic heating
System 50 includes the protective device 100 of electromagnetic heating system.
To sum up, the electromagnetic heating system proposed according to embodiments of the present invention is filled by the protection of above-mentioned electromagnetic heating system
It puts, voltage jump is detected, it is possible to prevente effectively from electromagnetic heating system works in high voltage low power or low pressure high power
State, the switching tube overcurrent breakdown of electromagnetic heating system caused by avoiding abnormal current, can be when electric voltage exception fluctuates pair
Electromagnetic heating system is protected, and improves the reliability of system.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be based on orientation shown in the drawings or
Position relationship is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, " multiple " are meant that at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
It connects or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature right over second feature or oblique upper or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " example ", " is specifically shown " some embodiments "
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It is combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the different embodiments or examples described in this specification and the feature of different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of protective device of electromagnetic heating system, which is characterized in that including：
Voltage sampling circuit, the voltage sampling circuit are connected with power supply, and the voltage sampling circuit is used for according to
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 are connected with the voltage sampling circuit, and the voltage conversion circuit is used for
Transformation processing is carried out to the voltage sampling signal；
Trigger circuit, the trigger circuit are connected with the voltage conversion circuit, after the trigger circuit is used for according to transformation
Voltage sampling signal generates trigger signal；
Chip is controlled, the control chip is connected with the trigger circuit, and the control chip is used to believe according to the triggering
Number judge the electromagnetic heating system to be controlled to stop heating when the voltage of the power supply exceeds predetermined voltage range.
2. the protective device of electromagnetic heating system according to claim 1, which is characterized in that the voltage sampling circuit packet
It includes：
Rectification unit, the input terminal of the rectification unit are connected with the power supply, and the rectification unit is used for the confession
The alternating current that power supply provides carries out rectification；
Partial pressure unit, the input terminal of the partial pressure unit are connected with the output terminal of the rectification unit, the partial pressure unit it is defeated
Outlet is connected with the voltage conversion circuit, and the partial pressure unit is used to divide with described in generation the alternating current after rectification
Voltage sampling signal.
3. the protective device of electromagnetic heating system according to claim 2, which is characterized in that the rectification unit includes：
First diode, the anode of first diode are connected with the first end of the power supply；
Second diode, the anode of second diode are connected with the second end of the power supply, second diode
Cathode be connected with the cathode 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 protective device of electromagnetic heating system according to claim 3, which is characterized 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 second node, and the other end of the 3rd resistor is grounded, the second node and the electricity
Pressure translation circuit is connected.
5. the protective device of electromagnetic heating system according to claim 4, which is characterized in that the partial pressure unit is also wrapped
It includes：
First capacitance, first capacitance are in parallel with the 3rd resistor；
Electrolytic capacitor, the electrolytic capacitor are in parallel with first capacitance.
6. the protective device of electromagnetic heating system according to claim 1, which is characterized in that the voltage conversion circuit packet
It includes：
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 terminal is connected；
5th resistance, one end of the 5th resistance are 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 are connected with the positive input terminal of the operational amplifier, the 6th resistance
The other end is connected with the output terminal of the operational amplifier, and the output terminal of the operational amplifier is connected with the trigger circuit；
Second capacitance, one end of second capacitance are connected with the positive input terminal of the operational amplifier, second capacitance
The other end is grounded.
7. the protective device of electromagnetic heating system according to claim 1, which is characterized in that the trigger circuit includes
555 timers, the first foot ground connection of 555 timer, the crus secunda of 555 timer be connected with the 6th foot after with it is described
Voltage conversion circuit is connected, and the third foot of 555 timer is connected with the control chip, and the 4th of 555 timer the
Foot is connected after being connected with octal with the first default power supply, and the 7th foot of 555 timer is pre- by the 7th resistance and second
If voltage is connected.
8. the protective device of the electromagnetic heating system according to claim 1 or 7, which is characterized 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 failing edge.
9. the protective device of electromagnetic heating system according to claim 8, which is characterized 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, which is characterized in that including the electromagnetic heating according to any one of claim 1-9
The protective device of system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611162228.6A CN108235480A (en) | 2016-12-15 | 2016-12-15 | Electromagnetic heating system and its protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611162228.6A CN108235480A (en) | 2016-12-15 | 2016-12-15 | Electromagnetic heating system and its protective device |
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| Publication Number | Publication Date |
|---|---|
| CN108235480A true CN108235480A (en) | 2018-06-29 |
Family
ID=62651567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611162228.6A Pending CN108235480A (en) | 2016-12-15 | 2016-12-15 | Electromagnetic heating system and its protective device |
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| Country | Link |
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| CN (1) | CN108235480A (en) |
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| WO2004068904A2 (en) * | 2003-01-31 | 2004-08-12 | Matsushita Electric Industrial Co., Ltd. | Electric power apparatus for an electromagnetic induction fixing apparatus and for an image forming apparatus using the same |
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| CN103845025A (en) * | 2012-11-28 | 2014-06-11 | 佛山市顺德区美的洗涤电器制造有限公司 | Dish washing machine and input voltage detection and protection circuit and method thereof |
| CN206353870U (en) * | 2016-12-15 | 2017-07-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its protection device |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2004068904A2 (en) * | 2003-01-31 | 2004-08-12 | Matsushita Electric Industrial Co., Ltd. | Electric power apparatus for an electromagnetic induction fixing apparatus and for an image forming apparatus using the same |
| CN1979006A (en) * | 2005-11-30 | 2007-06-13 | 海尔集团公司 | Microwave-oven power-supply voltage monitoring circuit and method for protecting abnormal power-supply voltage |
| KR20090046419A (en) * | 2007-11-06 | 2009-05-11 | 웅진쿠첸 주식회사 | Apparatus for controlling off time of inverter heating circuit |
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