CN105451385A - Cooking device having function of over-current protection - Google Patents
Cooking device having function of over-current protection Download PDFInfo
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- CN105451385A CN105451385A CN201410387743.9A CN201410387743A CN105451385A CN 105451385 A CN105451385 A CN 105451385A CN 201410387743 A CN201410387743 A CN 201410387743A CN 105451385 A CN105451385 A CN 105451385A
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Abstract
The invention discloses a cooking device having the function of over-current protection. The cooking device includes: an electromagnetic energy conversion circuit which is provided with an electromagnetic coil and a power switch unit; a drive circuit which is connected to an input end of the electromagnetic energy conversion circuit and is used for driving on-off of the power switch unit; a current sampling circuit which is used for acquiring the current of the electromagnetic coil; an over-current protection circuit which is connected to the current sampling circuit and generates a trigger signal when the current of the electromagnetic coil is greater than a preset current value; and a controller which is connected to the drive circuit and the over-current protection circuit and closes a control signal being output to the drive circuit after receiving the trigger signal. The cooking device can perform real-time monitoring on the current of the electromagnetic coil through the current sampling circuit, and can timely stop output of a drive signal in the drive circuit during over-current, so that the power switch unit such as an IGBT, can be protected, and damage to the power switch unit such as an IGBT, due to over-current, can be prevented.
Description
Technical field
The present invention relates to living electric apparatus technical field, particularly a kind of cooking equipment possessing overcurrent protection function.
Background technology
In the cooking equipment adopting half-bridge topology or full-bridge topology, usual employing high power switch element IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor) construct half-bridge topology or full-bridge topology, in use, if the electric current flowing through IGBT is excessive, IGBT will be made to damage because of overcurrent.But, the electric current flowing through IGBT is not detected in the cooking equipment of correlation technique.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.
For this reason, the object of the invention is to propose a kind of cooking equipment possessing overcurrent protection function that can prevent IGBT from damaging because of overcurrent.
According to the cooking equipment possessing overcurrent protection function that the embodiment of the present invention proposes, comprising: electromagnetic energy change-over circuit, described electromagnetic energy change-over circuit has solenoid and power switch unit; Drive circuit, described drive circuit is connected with described electromagnetic energy change-over circuit input, for driving turning on and off of described power switch unit; Current sampling circuit, described current sampling circuit is for gathering the electric current of described solenoid; Current foldback circuit, described current foldback circuit is connected with described current sampling circuit, and described current foldback circuit generates triggering signal when the electric current of described solenoid is greater than pre-set current value; Controller, described controller is connected with described current foldback circuit with described drive circuit respectively, and described controller cuts out the control signal exporting described drive circuit to after receiving described triggering signal.
According to the cooking equipment possessing overcurrent protection function that the embodiment of the present invention proposes; the electric current of solenoid is gathered by current sampling circuit; current foldback circuit generates triggering signal when the electric current of solenoid is greater than pre-set current value, and controller cuts out the control signal exporting drive circuit to after receiving triggering signal.Thus; this cooking equipment carries out Real-Time Monitoring by current sampling circuit to the electric current of solenoid; and the output of drive singal in drive circuit is stopped in time when overcurrent; thus the power switch unit such as IGBT in protection cooker, prevent power switch unit such as IGBT from damaging because of overcurrent.
In addition, the cooking equipment possessing overcurrent protection function according to the above embodiment of the present invention can also have following additional technical characteristic:
Particularly, according to one embodiment of present invention, described current sample comprises: current transformer, and described current transformer generates corresponding detection electric current according to the electric current induction of described solenoid; Reshaper, described reshaper is connected with described current transformer, and described reshaper carries out shaping to described detection electric current.
Further, according to one embodiment of present invention, described reshaper comprises: the first resistance, and the first end of described first resistance is connected with the first end of described current transformer, the second end ground connection of described first resistance; Second resistance, the first end of described second resistance is connected with the second end of described current transformer, the second end ground connection of described second resistance; Respectively with the first electric capacity and second electric capacity of described first resistance and the second resistor coupled in parallel; 3rd resistance, the first end ground connection of described 3rd resistance, the second end of described 3rd resistance is connected with the output of described reshaper; First diode and the second diode, described first diode is connected with the second end with the first end of described current transformer respectively with the anode of the second diode, and described first diode is connected with the output of described reshaper with the negative electrode of the second diode.
Particularly, according to one embodiment of present invention, described current foldback circuit comprises: the 4th resistance, and the first end of described 4th resistance is connected with the output of described current sampling circuit; 5th resistance and the 6th resistance, the first end ground connection of described 5th resistance, the second end of described 5th resistance is connected with the first end of described 6th resistance, has node between described 5th resistance and described 6th resistance; Comparator, the first input end of described comparator is connected with the second end of described 4th resistance, and the second input of described comparator is connected with described node, and the output of described comparator is connected with second end of described controller with described 6th resistance.
Particularly, according to one embodiment of present invention, described over-current detection circuit also comprises: the 7th resistance and the 8th resistance, the first end of described 7th resistance is connected with described node, second end of described 7th resistance is connected with power supply, the first end of described 8th resistance is connected with described power supply, and the second end of described 8th resistance is connected with the output of described comparator.
Particularly, according to one embodiment of present invention, described over-current detection circuit also comprises: the 3rd diode, and the anode of described 3rd diode is connected with the first input end of described comparator, and the negative electrode of described 3rd diode is connected with power supply.
According to one embodiment of present invention, the described cooking equipment possessing overcurrent protection function also comprises: be connected to the filter circuit between described controller and reshaper.
Particularly, according to one embodiment of present invention, described filter circuit comprises: the 9th resistance, and the first end of described 9th resistance is connected with the output of described reshaper, and the second end of described 9th resistance is connected with described controller; 3rd electric capacity, the first end of described 3rd electric capacity is connected with the second end of described 9th resistance, the second end ground connection of described 3rd electric capacity.
According to a specific embodiment of the present invention, described cooking equipment is electromagnetic oven, IH electric cooker, IH electric pressure cooker.
Accompanying drawing explanation
Fig. 1 is the block diagram possessing the cooking equipment of overcurrent protection function according to the embodiment of the present invention;
Fig. 2 is the block diagram of the cooking equipment possessing overcurrent protection function according to an embodiment of the invention; And
Fig. 3 is the circuit theory diagrams possessing the cooking equipment of overcurrent protection function according to the present invention's specific embodiment.
Reference numeral:
Solenoid 10, power switch unit 11, electromagnetic energy change-over circuit 20, drive circuit 30, testing circuit 40, over-current detection circuit 50, controller 60, filter circuit 70, current transformer 401, reshaper 402, first resistance R1, second resistance R2, first electric capacity C1, second electric capacity C2, 3rd resistance R3, first diode D1, second diode D2, 4th resistance R4, 5th resistance R5, 6th resistance R6, comparator CMP, 7th resistance R7, 8th resistance R8, 3rd diode D3, 9th resistance R9, 3rd electric capacity C3, one IGBT101, 2nd IGBT102, 4th electric capacity C4 and the 5th electric capacity C5.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The cooking equipment possessing overcurrent protection function proposed according to the embodiment of the present invention is described with reference to the accompanying drawings.
Fig. 1 is the block diagram possessing the cooking equipment of overcurrent protection function according to the embodiment of the present invention.As shown in Figure 1, this cooking equipment comprises: electromagnetic energy change-over circuit 20, drive circuit 30, current sampling circuit 40, current foldback circuit 50 and controller 60.
Wherein, electromagnetic energy change-over circuit 20 has solenoid 10 and power switch unit 11, and drive circuit 30 is connected with the input of electromagnetic energy change-over circuit 20, for turning on and off of driving power switch element 11; Current sampling circuit 40 is for gathering the electric current of solenoid 10; Current foldback circuit 50 is connected with current sampling circuit 40, and current foldback circuit 50 generates triggering signal when the electric current of solenoid 10 is greater than pre-set current value; Controller 60 is connected with current foldback circuit 50 with drive circuit 30 respectively, and controller 60 cuts out the control signal exporting drive circuit 30 to after receiving triggering signal.
Specifically, exportable PWM (the PulseWidthModulation of controller 60, pulse width modulation) control signal to drive circuit 30, drive circuit 30 sends drive singal to the power switch unit 11 in electromagnetic energy change-over circuit 20 after receiving pwm control signal, to make power switch unit 11 output AC electricity to solenoid 10, alternating current flows through solenoid 10 after solenoid 10 and produces magnetic field to heat cooking apparatus.Like this, time in the process that cooking equipment heats cooking apparatus, current sampling circuit 40 can the electric current of Real-time Collection solenoid 10, and the electric current of solenoid 10 is flowed to current foldback circuit 50, after current foldback circuit 50 receives the electric current of solenoid 10, the electric current of solenoid 10 is compared with pre-set current value, when the electric current of solenoid 10 is greater than pre-set current value, current foldback circuit 50 sends triggering signal to controller 60, controller 60 turns off PWM output fast by the mode of hardware or software control after receiving triggering signal, namely stop exporting pwm control signal to drive circuit 30.Thus; the cooking equipment of the embodiment of the present invention can carry out Real-Time Monitoring to the electric current of solenoid; and the output of drive singal is stopped in time when overcurrent, thus the power switch unit such as IGBT in protection cooking equipment, prevent power switch unit such as IGBT from damaging because of overcurrent.
In addition, it should be noted that, the lowest high-current value when pre-set current value IGBT that can be in electromagnetic energy change-over circuit 20 normally works.
According to one embodiment of present invention, electromagnetic energy change-over circuit 20 can be half-bridge topology circuit or the IGBT full-bridge topology circuit of IGBT.Particularly, as shown in Figure 3, electromagnetic energy change-over circuit 20 is half-bridge topology circuit, and power switch unit 11 comprises an IGBT101 and the 2nd IGBT102.
Wherein, half-bridge topology circuit as shown in Figure 3 comprises an IGBT101 and the 2nd IGBT102, the grid of the one IGBT101 is connected to receive drive singal with drive circuit 30 respectively with the grid of the 2nd IGBT102, the drain electrode of the one IGBT20 is connected with the first power supply Vdc, the source electrode of the one IGBT101 is connected with the drain electrode of the 2nd IGBT102, the source ground of the 2nd IGBT102, and, between the source electrode of the one IGBT101 and the drain electrode of the 2nd IGBT102, there is first node, first node is connected with the first end of solenoid 10, the drain electrode of the one IGBT20 is also all connected with the second end of solenoid 10 with the source electrode of the 2nd IGBT102.
As shown in Figure 3, electromagnetic energy change-over circuit 20 also can comprise the 4th electric capacity C4 and the 5th electric capacity C5.The drain electrode of the one IGBT20 is connected with the second end of solenoid 10 by the 4th electric capacity C4, and the source electrode of the 2nd IGBT102 is connected with the second end of solenoid 10 by the 5th electric capacity C5.Namely the first end of the 4th electric capacity C4 is connected with the drain electrode of an IGBT101, second end of the 4th electric capacity C4 is connected with the first end of the 5th electric capacity C5, second end of the 5th electric capacity C5 is connected with the source electrode of the 2nd IGBT102, and, between 4th electric capacity C4 and the 5th electric capacity C5, there is Section Point, Section Point is connected with the second end of solenoid 10, current sampling circuit 40 can sample first node and solenoid 10 first end between electric current.Wherein, the 4th electric capacity C4 and the 5th electric capacity C5 is resonant capacitance.
According to one embodiment of present invention, as shown in Figure 2, testing circuit 40 comprises: current transformer 401 and reshaper 402.Current transformer 401 generates corresponding detection electric current according to the electric current induction of solenoid 10; Reshaper 402 is connected with current transformer 401, and reshaper 402 carries out shaping to detection electric current.Wherein, current transformer 401 can be HF current transformer, and detection electric current is form of communication.
That is, current transformer 401 is for the electric current of solenoid 10 of sampling, and by the electric current of solenoid 10 by predetermined current than being converted to corresponding detection electric current, namely detect the electric current that electric current equals solenoid 10 and be multiplied by predetermined current ratio, afterwards, detection electric current is sent to reshaper 402 by current transformer 401, and reshaper 402 carries out Shape correction to the waveform detecting electric current, comprise and the detection current conversion of alternating current form is become alternating voltage, then alternating voltage is changed into direct voltage.
Particularly, according to one embodiment of present invention, as shown in Figure 3, reshaper 402 comprises: the first resistance R1, the second resistance R2, the first electric capacity C1, the second electric capacity C2, the 3rd resistance R3, the first diode D1 and the second diode D2.First resistance R1, the second resistance R2 and the 3rd resistance R3 are load resistance, and the first electric capacity C1 and the second electric capacity C2 is filter capacitor, and the first diode D1 and the second diode D2 is rectifier diode.
Wherein, the first end of the first resistance R1 is connected with the first end of current transformer 401, the second end ground connection of the first resistance R1; The first end of the second resistance R2 is connected with the second end of current transformer 401, the second end ground connection of the second resistance R2; First electric capacity C1 and the second electric capacity C2 is in parallel with the first resistance R1 and the second resistance R2 respectively, namely the first end of the first electric capacity C1 is connected with the first end of the first resistance R1, second end of the first electric capacity C1 is connected with second end of the first resistance R1, the first end of the second electric capacity C2 is connected with the first end of the second resistance R2, and second end of the second electric capacity C2 is connected with second end of the second resistance R2; The first end ground connection of the 3rd resistance R3, second end of the 3rd resistance R3 is connected with the output of reshaper 402; First diode D1 is connected with the second end with the first end of current transformer 401 respectively with the anode of the second diode D2, first diode D1 is connected with the output of reshaper 402 with the negative electrode of the second diode D2, namely the negative electrode of the first diode D1 is connected with the first output OUT1 of reshaper 402, and the negative electrode of the second diode D2 is connected with the second output OUT2 of reshaper 402.
That is, current transformer 401 output detections electric current is to reshaper 402, the detection current conversion of alternating current form is become alternating voltage with the second resistance R2 by the first resistance R1 in reshaper 402, and alternating voltage changes into direct voltage by alternating voltage after the first diode D1 and the second diode D2.
Particularly, according to one embodiment of present invention, as shown in Figure 3, over-current detection circuit 50 comprises: the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and comparator CMP.
Wherein, the first end of the 4th resistance R4 and current sampling circuit 40, be namely connected with the first output OUT1 of reshaper 402; The first end ground connection of the 5th resistance R5, second end of the 5th resistance R5 is connected with the first end of the 6th resistance R6, has nodes X between the 5th resistance R5 and the 6th resistance R6; The first input end of comparator CMP and inverting input are connected with second end of the 4th resistance R4, and second input of comparator CMP and normal phase input end are connected with nodes X, and the output of comparator CMP is connected with second end of controller 60 with the 6th resistance R6.
As shown in Figure 3, controller 60 can be single-chip microcomputer, and the output of comparator CMP is connected with the INT pin of single-chip microcomputer, when single-chip microcomputer INT pin is high level, does not affect, export pwm control signal to drive circuit 30 to the output of pwm control signal; When single-chip microcomputer INT pin is low level, the INT pin triggering single-chip microcomputer interrupts, and the inner mode by hardware or software control of single-chip microcomputer turns off the output of pwm control signal fast, namely stops exporting pwm control signal to drive circuit 30.
Particularly, according to one embodiment of present invention, as shown in Figure 3, current foldback circuit 50 also comprises: the 7th resistance R7 and the 8th resistance R8.Wherein, the first end of the 7th resistance R7 is connected with nodes X, and second end of the 7th resistance R7 is connected with power supply VCC, and the first end of the 8th resistance R8 is connected with power supply VCC, and second end of the 8th resistance R8 is connected with the output of comparator CMP.Power supply VCC can be the DC power supply of+5V.
Wherein, the 4th resistance R4 is current-limiting resistance, and the 5th resistance R5 and the 7th resistance R7 is the sample resistance of the predeterminated voltage of comparator CMP normal phase input end, and the 6th resistance R6 is sluggish trigger resistance, and the 8th resistance R8 is pull-up resistor.
Particularly, according to one embodiment of present invention, as shown in Figure 3, over-current detection circuit 50 also comprises: the 3rd diode D3.The anode of the 3rd diode D3 is connected with the first input end of comparator CMP, and the negative electrode of the 3rd diode D3 is connected with power supply VCC.Wherein, the 3rd diode D3 is pressure limiting diode.
That is, after reshaper 402 carries out shaping to the waveform detecting electric current, by the direct voltage output that obtains after shaping to the inverting input of comparator CMP, the predeterminated voltage of the normal phase input end of this direct voltage and comparator CMP compares, if direct voltage is less than predeterminated voltage, then the output of comparator CMP exports the INT pin of high level signal to single-chip microcomputer, and single-chip microcomputer INT pin is high level, does not affect the output of pwm control signal; If direct voltage is greater than predeterminated voltage, then the output output low level signal of comparator CMP is to the INT pin of single-chip microcomputer, single-chip microcomputer INT pin is low level, the INT pin triggering single-chip microcomputer interrupts, and the inner mode by hardware or software control of single-chip microcomputer turns off the output of pwm control signal fast.Wherein, the lowest high-current value when predeterminated voltage of the normal phase input end of comparator CMP normally can be worked by predetermined current and IGBT determines, namely, when the electric current of solenoid 10 equals pre-set current value, the direct voltage of the inverting input of comparator CMP equals the predeterminated voltage of the normal phase input end of comparator CMP.Particularly, as shown in Figure 3, by setting the resistance setting predeterminated voltage of the 5th resistance R5 and the 7th resistance R7.
Thus, when the current anomaly of solenoid 10 increases, the detection electric current that current transformer 401 induced current generates will increase, and the direct voltage that reshaper 402 outputs to comparator CMP inverting input also will increase.Thus, along with the increase of the electric current of solenoid 10, when the electric current of solenoid 10 is greater than pre-set current value, the direct voltage of comparator CMP inverting input is also greater than the predeterminated voltage of comparator CMP normal phase input end thereupon, the output output low level signal of comparator CMP is to the INT pin of single-chip microcomputer, the INT pin triggering single-chip microcomputer interrupts, the inner mode by hardware or software control of single-chip microcomputer turns off the output of pwm control signal fast, thus power switch unit such as IGBT can be protected, prevent power switch unit such as IGBT from causing damage because of overcurrent.And when the electric current of solenoid 10 is less than pre-set current value, the direct voltage of comparator CMP inverting input is also less than the predeterminated voltage of comparator CMP normal phase input end, the output of comparator CMP will export the INT pin of high level signal to single-chip microcomputer, and the normal pwm control signal that exports is to drive circuit 30.
According to one embodiment of present invention, as shown in Figures 2 and 3, controller 60 is connected with reshaper 402, and controller 60 generates control signal according to detection electric current.
That is, after reshaper 402 carries out shaping to detection current waveform, the direct voltage output obtained after by shaping to current foldback circuit 50 while, also by direct voltage output to controller 60, due to this direct voltage size reflection power output size, controller 60 by according to this direct voltage generate pwm control signal to control the power output of cooking equipment, wherein, it should be noted that, when power output increases, direct voltage increases thereupon; When power output reduces, direct voltage reduces thereupon.
Particularly, as shown in Figure 3, second output OUT2 of reshaper 402 and the ADC pin of single-chip microcomputer, reshaper 402 by direct voltage output to after single-chip microcomputer, first single-chip microcomputer carries out analog-to-digital conversion to direct voltage, analog voltage signal is converted to digital voltage signal, and single-chip microcomputer generates pwm control signal according to the direct voltage after conversion again.
Further, according to one embodiment of present invention, as shown in Figures 2 and 3, the cooking equipment possessing overcurrent protection function also comprises: filter circuit 70.Wherein, filter circuit 70 is connected between controller 60 and reshaper 402.
That is, filter circuit 70 carries out filtering process to obtain more straight direct voltage for the direct voltage exported reshaper 402, then, filter circuit 70 is by more straight direct voltage output to controller 60, and controller 60 carries out patten transformation to more straight direct voltage.
Particularly, according to one embodiment of present invention, as shown in Figure 3, filter circuit 70 comprises: the 9th resistance R9 and the 3rd electric capacity C3.The first end of the 9th resistance R9 is connected with the output of reshaper 402, second end of the 9th resistance R9 is connected with controller 60, namely the first end of the 9th resistance R9 is connected with the second output OUT2 of reshaper 402, and second end of the 9th resistance R9 is connected with the ADC pin of single-chip microcomputer; The first end of the 3rd electric capacity C3 is connected with second end of the 9th resistance R9, the second end ground connection of the 3rd electric capacity C3.
That is, filter circuit 70 can be RC filter circuit, and the direct voltage that reshaper 402 exports is converted to more straight direct voltage after RC filtering, exports to controller 60.
Generally speaking, current transformer 401 by the electric current of solenoid 10 (such as, the electric current of the one IGBT20 and the 2nd IGBT21) by after the conversion of predetermined current ratio, output detections electric current is to reshaper 402, the detection current conversion of alternating current form is become alternating voltage by reshaper 402, again alternating voltage is changed into direct voltage, then, two-way is divided to export respectively direct voltage: a road direct voltage output is to the inverting input of the comparator CMP in over-current detection circuit 50, and compare with the predeterminated voltage of the normal phase input end of comparator CMP, if direct voltage exports high level lower than the output of predeterminated voltage comparator CMP, controller 60 normally exports pwm control signal to drive circuit 30, if direct voltage exceeds predeterminated voltage, the then output output low level of comparator CMP, the inside of controller 60 turns off the output of pwm control signal fast by the mode of hardware or software control, stop exporting pwm control signal to drive circuit 30, thus the power switch unit such as IGBT unit in protection cooking equipment, prevent power switch unit such as IGBT unit from damaging because of overcurrent, another road outputs to filter circuit 70, converts level and smooth analog voltage signal to and export to controller 60 after RC filtering, and controller 60 generates pwm control signal to control the power output of cooking equipment according to level and smooth analog voltage signal.
In addition, according to embodiments of the invention, cooking equipment can be electromagnetic oven, IH electric cooker, IH electric pressure cooker etc.
To sum up; according to the cooking equipment possessing overcurrent protection function that the embodiment of the present invention proposes; the electric current of solenoid is gathered by current sampling circuit; current foldback circuit generates triggering signal when the electric current of solenoid is greater than pre-set current value, and controller cuts out the control signal exporting drive circuit to after receiving triggering signal.Thus; this cooking equipment carries out Real-Time Monitoring by current sampling circuit to the electric current of solenoid; and the output of drive singal in drive circuit is stopped in time when overcurrent; thus the power switch unit such as IGBT in protection cooker, prevent power switch unit such as IGBT from damaging because of overcurrent.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (9)
1. possess a cooking equipment for overcurrent protection function, it is characterized in that, comprising:
Electromagnetic energy change-over circuit, described electromagnetic energy change-over circuit has solenoid and power switch unit;
Drive circuit, described drive circuit is connected with the input of described electromagnetic energy change-over circuit, for driving turning on and off of described power switch unit;
Current sampling circuit, described current sampling circuit is for gathering the electric current of described solenoid;
Current foldback circuit, described current foldback circuit is connected with described current sampling circuit, and described current foldback circuit generates triggering signal when the electric current of described solenoid is greater than pre-set current value; And
Controller, described controller is connected with described current foldback circuit with described drive circuit respectively, and described controller cuts out the control signal exporting described drive circuit to after receiving described triggering signal.
2. possess the cooking equipment of overcurrent protection function as claimed in claim 1, it is characterized in that, described current sampling circuit comprises:
Current transformer, described current transformer generates corresponding detection electric current according to the electric current induction of described solenoid; And
Reshaper, described reshaper is connected with described current transformer, and described reshaper carries out shaping to described detection electric current.
3. possess the cooking equipment of overcurrent protection function as claimed in claim 2, it is characterized in that, described reshaper comprises:
First resistance, the first end of described first resistance is connected with the first end of described current transformer, the second end ground connection of described first resistance;
Second resistance, the first end of described second resistance is connected with the second end of described current transformer, the second end ground connection of described second resistance;
Respectively with the first electric capacity and second electric capacity of described first resistance and the second resistor coupled in parallel;
3rd resistance, the first end ground connection of described 3rd resistance, the second end of described 3rd resistance is connected with the output of described reshaper; And
First diode and the second diode, described first diode is connected with the second end with the first end of described current transformer respectively with the anode of the second diode, and described first diode is connected with the output of described reshaper with the negative electrode of the second diode.
4. possess the cooking equipment of overcurrent protection function as claimed in claim 1, it is characterized in that, described current foldback circuit comprises:
4th resistance, the first end of described 4th resistance is connected with the output of described current sampling circuit;
5th resistance and the 6th resistance, the first end ground connection of described 5th resistance, the second end of described 5th resistance is connected with the first end of described 6th resistance, has node between described 5th resistance and described 6th resistance;
Comparator, the first input end of described comparator is connected with the second end of described 4th resistance, and the second input of described comparator is connected with described node, and the output of described comparator is connected with second end of described controller with described 6th resistance.
5. possess the cooking equipment of overcurrent protection function as claimed in claim 4, it is characterized in that, described over-current detection circuit also comprises:
7th resistance and the 8th resistance, the first end of described 7th resistance is connected with described node, second end of described 7th resistance is connected with power supply, and the first end of described 8th resistance is connected with described power supply, and the second end of described 8th resistance is connected with the output of described comparator.
6. possess the cooking equipment of overcurrent protection function as claimed in claim 4, it is characterized in that, described over-current detection circuit also comprises:
3rd diode, the anode of described 3rd diode is connected with the first input end of described comparator, and the negative electrode of described 3rd diode is connected with power supply.
7. possess the cooking equipment of overcurrent protection function as claimed in claim 3, it is characterized in that, also comprise:
Be connected to the filter circuit between described controller and described reshaper.
8. possess the cooking equipment of overcurrent protection function as claimed in claim 7, it is characterized in that, described filter circuit comprises:
9th resistance, the first end of described 9th resistance is connected with the output of described reshaper, and the second end of described 9th resistance is connected with described controller;
3rd electric capacity, the first end of described 3rd electric capacity is connected with the second end of described 9th resistance, the second end ground connection of described 3rd electric capacity.
9. the cooking equipment possessing overcurrent protection function as described in any one of claim 1-8, is characterized in that, described cooking equipment is electromagnetic oven, IH electric cooker, IH electric pressure cooker.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410387743.9A CN105451385B (en) | 2014-08-07 | 2014-08-07 | The cooking equipment for having overcurrent protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410387743.9A CN105451385B (en) | 2014-08-07 | 2014-08-07 | The cooking equipment for having overcurrent protection function |
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| CN201410387743.9A Active CN105451385B (en) | 2014-08-07 | 2014-08-07 | The cooking equipment for having overcurrent protection function |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106594990A (en) * | 2016-12-15 | 2017-04-26 | 广东美的暖通设备有限公司 | Control method and device for household appliances and household appliances |
| CN107277959A (en) * | 2017-06-27 | 2017-10-20 | 天津掌心众联科技有限公司 | A kind of electromagnetic heating system and method based on PID control |
| CN107461772A (en) * | 2017-06-14 | 2017-12-12 | 珠海格力电器股份有限公司 | Induction cooker control method, control device and computer readable storage medium |
| CN107635299A (en) * | 2016-07-18 | 2018-01-26 | 佛山市顺德区美的电热电器制造有限公司 | The driving chip of Electromagnetic Heating cooking system and its power switch pipe |
| CN108024405A (en) * | 2016-11-03 | 2018-05-11 | 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 |
| CN110446285A (en) * | 2018-05-02 | 2019-11-12 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooking device and electromagnetic heating system for electric cooking device |
| CN110613313A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
| CN111404112A (en) * | 2020-03-17 | 2020-07-10 | 海信（山东）空调有限公司 | PFC overcurrent protection circuit, air conditioner controller and air conditioner |
| CN111743424A (en) * | 2019-03-29 | 2020-10-09 | 佛山市顺德区美的电热电器制造有限公司 | Insulation board, control device, control method and electronic cooking appliance |
| CN112449445A (en) * | 2020-11-27 | 2021-03-05 | 广东美的厨房电器制造有限公司 | Electric heating circuit, cooking utensil, electric heating device, control method and storage medium |
| CN113133138A (en) * | 2019-12-31 | 2021-07-16 | 广东美的白色家电技术创新中心有限公司 | Heating circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107635299B (en) * | 2016-07-18 | 2021-06-18 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking system and driving chip of power switch tube thereof |
| CN107635299A (en) * | 2016-07-18 | 2018-01-26 | 佛山市顺德区美的电热电器制造有限公司 | The driving chip of Electromagnetic Heating cooking system and its power switch pipe |
| CN108024405A (en) * | 2016-11-03 | 2018-05-11 | 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 |
| CN108024405B (en) * | 2016-11-03 | 2021-12-21 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and protection device thereof |
| CN106594990A (en) * | 2016-12-15 | 2017-04-26 | 广东美的暖通设备有限公司 | Control method and device for household appliances and household appliances |
| CN107461772A (en) * | 2017-06-14 | 2017-12-12 | 珠海格力电器股份有限公司 | Induction cooker control method, control device and computer readable storage medium |
| CN107277959A (en) * | 2017-06-27 | 2017-10-20 | 天津掌心众联科技有限公司 | A kind of electromagnetic heating system and method based on PID control |
| CN110446285A (en) * | 2018-05-02 | 2019-11-12 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooking device and electromagnetic heating system for electric cooking device |
| CN110446285B (en) * | 2018-05-02 | 2022-02-25 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooking device and electromagnetic heating system for electric cooking device |
| CN110613313B (en) * | 2018-06-20 | 2021-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
| CN110613313A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
| CN111743424A (en) * | 2019-03-29 | 2020-10-09 | 佛山市顺德区美的电热电器制造有限公司 | Insulation board, control device, control method and electronic cooking appliance |
| CN113133138A (en) * | 2019-12-31 | 2021-07-16 | 广东美的白色家电技术创新中心有限公司 | Heating circuit |
| CN113133138B (en) * | 2019-12-31 | 2022-09-30 | 广东美的白色家电技术创新中心有限公司 | Heating circuit |
| CN111404112A (en) * | 2020-03-17 | 2020-07-10 | 海信（山东）空调有限公司 | PFC overcurrent protection circuit, air conditioner controller and air conditioner |
| CN111404112B (en) * | 2020-03-17 | 2022-11-11 | 海信空调有限公司 | PFC overcurrent protection circuit, air conditioner controller and air conditioner |
| CN112449445A (en) * | 2020-11-27 | 2021-03-05 | 广东美的厨房电器制造有限公司 | Electric heating circuit, cooking utensil, electric heating device, control method and storage medium |
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