CN204795668U - Power supply circuit of electromagnetic heating culinary art device and electromagnetic heating culinary art device - Google Patents
Power supply circuit of electromagnetic heating culinary art device and electromagnetic heating culinary art device Download PDFInfo
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- CN204795668U CN204795668U CN201520503702.1U CN201520503702U CN204795668U CN 204795668 U CN204795668 U CN 204795668U CN 201520503702 U CN201520503702 U CN 201520503702U CN 204795668 U CN204795668 U CN 204795668U
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Abstract
The utility model discloses a power supply circuit of electromagnetic heating culinary art device and the electromagnetic heating culinary art device that has it, power supply circuit includes: the rectifier bridge, current -limiting filtering unit, the switching power supply chip, the second DC voltage of exporting current -limiting filtering unit carries out high frequency copped wave processing in order to obtain pulse voltage, a transformer, vary into a DC power supply in order to export through primary winding with pulse voltage, it exports with the secondary through the transformer to vary into the 2nd DC power supply with a DC power supply, the controllable switch circuit, voltage fluctuation feedback a to DC power supply with the 2nd DC power supply, power supply feedback Unit, give the power supply of switching power supply chip and feedback the switching power supply chip with a DC power supply's voltage fluctuation, so that a DC power supply's voltage and the 2nd DC power supply's voltage are adjusted simultaneously to the switching power supply chip. This power supply circuit can adjust multichannel DC power supply's voltage simultaneously and export the galvanic current and press.
Description
Technical field
The utility model relates to electromagnetic heating technique field, particularly a kind of power circuit of Electromagnetic Heating cooker and a kind of Electromagnetic Heating cooker.
Background technology
In electromagnetic oven electric-control system, usual employing BUCK or flyback topology structure circuit convert single high voltage source IC (electric main converts direct current to) to DC power supply that voltage is 18V, then after the voltage stabilizing of voltage stabilizing chip, exports the DC power supply that comparatively stable voltage is 5V through transformer transformation.
But the interaction capabilities of the DC power supply of 18V and the DC power supply of 5V is poor in this power-supply system.Such as, the DC power supply of 18V powers mainly to the blower fan in electromagnetic oven, when blower fan quits work, when namely system is in light load operation mode, voltage is that the load capacity of the DC power supply of 5V is extremely low, when electric current is more than 150mA, 5V voltage will drop to below 3V rapidly, causes power-supply system power supply instability, thus causes the button of electromagnetic oven insensitive, even there is the phenomenon that electromagnetic oven resets, affect user and use.
Utility model content
The utility model is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, an object of the present utility model is that proposition is a kind of and can regulates the voltage of multi-channel dc power supply and the power circuit of the Electromagnetic Heating cooker of the direct voltage of stable output simultaneously.
Another object of the present utility model is to propose a kind of Electromagnetic Heating cooker.
For achieving the above object, the utility model proposes a kind of power circuit of Electromagnetic Heating cooker on the one hand, comprising: for carrying out the rectifier bridge of full-wave rectification to the electric main of input; Current limliting filter unit, described current limliting filter unit is connected with described rectifier bridge, and described current limliting filter unit carries out current limliting filtering process to obtain the second direct voltage to the first direct voltage that described rectifier bridge exports; Switching power source chip, described switching power source chip is connected with described current limliting filter unit, and described switching power source chip carries out high frequency chopping process to obtain pulse voltage to described second direct voltage; Transformer, the armature winding of described transformer is connected with described switching power source chip, described pulse voltage is transformed into the first DC power supply to be exported by described armature winding by described transformer, and described first DC power supply is transformed into the second DC power supply to be exported by the secondary winding of described transformer; Gate-controlled switch circuit, described gate-controlled switch circuit is connected between the output of described first DC power supply and the output of described second DC power supply, by described first DC power supply and described second DC power supply, described controllable switch unit is by being associated that the voltage fluctuation of described second DC power supply is fed back to described first DC power supply; Power supply feedback unit, described power supply feedback unit is connected with described switching power source chip with the armature winding of described transformer respectively, described power supply feedback unit powers to described switching power source chip, and the voltage fluctuation of described first DC power supply is fed back to described switching power source chip, with the voltage making described switching power source chip regulate the voltage of described first DC power supply and described second DC power supply simultaneously.
According to the power circuit of the Electromagnetic Heating cooker of the utility model embodiment, the electric main of rectifier bridge to input carries out full-wave rectification to export the first direct voltage, current limliting filter unit carries out current limliting filtering process to obtain the second direct voltage to the first direct voltage, switching power source chip carries out high frequency chopping process to obtain pulse voltage to the second direct voltage, pulse voltage is transformed into the first DC power supply to be exported by armature winding by transformer, and the first DC power supply is transformed into the second DC power supply exports with the secondary winding by transformer, by the first DC power supply and the second DC power supply, controllable switch unit is by being associated that the voltage fluctuation of the second DC power supply is fed back to the first DC power supply, power supply feedback unit is powered to switching power source chip, and the voltage fluctuation of the first DC power supply is fed back to switching power source chip, regulate the voltage of the first DC power supply and the voltage of the second DC power supply to make switching power source chip simultaneously, improve the interactivity of the voltage of multi-channel dc power supply, and this power circuit can the direct voltage of stable output, improve the stability of cooker.
Particularly, the voltage of described first DC power supply and the voltage of described second DC power supply are multiple proportion.
Particularly, described power supply feedback unit comprises: the first diode, and the anode of described first diode is connected with one end of described armature winding, and the negative electrode of described first diode is connected with the feeder ear of described switching power source chip; First voltage-stabiliser tube, the anode of described first voltage-stabiliser tube is connected with the feedback end of described switching power source chip, and the negative electrode of described first voltage-stabiliser tube is connected with the negative electrode of described first diode; First electric capacity, one end of described first electric capacity is connected with the feedback end of described switching power source chip with the anode of described first voltage-stabiliser tube respectively, and the other end of described first electric capacity is connected with the output of described switching power source chip with the other end of described armature winding; Second electric capacity, one end of described second electric capacity is connected with the negative electrode of described first voltage-stabiliser tube with the negative electrode of described first diode respectively, and the other end of described second electric capacity is connected with the output of described switching power source chip with the other end of described armature winding, the other end of described first electric capacity respectively.
Particularly, the power circuit of above-mentioned Electromagnetic Heating cooker, also comprise: fly-wheel diode, the negative electrode of described fly-wheel diode is connected with the output of described switching power source chip with the other end of described armature winding respectively, the anode of described second diode is connected with the second diode one end with described secondary winding by the first filter capacitor, and the plus earth of described fly-wheel diode, the other end ground connection of described secondary winding.
Particularly, the power circuit of above-mentioned Electromagnetic Heating cooker, also comprise: voltage-stabilizing device, the input of described voltage-stabilizing device is connected with one end of the first filter capacitor with the negative electrode of described second diode respectively, the other end ground connection of described first filter capacitor, described voltage-stabilizing device generates the 3rd DC power supply according to described second DC power supply and exports, and wherein, the voltage of described 3rd DC power supply is less than the voltage of described second DC power supply; Second filter capacitor, one end of described second filter capacitor is connected with the output of described voltage-stabilizing device, the other end ground connection of described second filter capacitor, and described second filter capacitor carries out filtering process to described 3rd DC power supply.
Particularly, described gate-controlled switch circuit comprises: the first triode, and the emitter of described first triode is connected with the output of described first DC power supply, and the collector electrode of described first triode is connected with the output of described second DC power supply; First resistance, one end of described first resistance is connected with the base stage of described first triode, and the other end of described first resistance is connected with the output of described second DC power supply.
Particularly, described gate-controlled switch circuit also comprises: the second triode, and the collector electrode of described second triode is connected with the other end of described first resistance, the grounded emitter of described second triode; Second resistance, one end of described second resistance is connected with the base stage of described second triode, the other end of described second resistance is connected with the controller of described Electromagnetic Heating cooker, wherein, described controller exports control signal to control described second triode ON when detecting that the voltage of described second DC power supply is less than predetermined voltage threshold.
For achieving the above object, the utility model proposes a kind of Electromagnetic Heating cooker on the other hand, and it comprises the power circuit of above-mentioned Electromagnetic Heating cooker.
This Electromagnetic Heating cooker, by the power circuit of above-mentioned Electromagnetic Heating cooker, can improve the interactivity of the voltage of multi-channel dc power supply and the direct voltage of stable output, improve the stability of cooker.
Accompanying drawing explanation
Fig. 1 is the block diagram of the power circuit of Electromagnetic Heating cooker according to the utility model embodiment.
Fig. 2 is the circuit diagram of the power circuit of Electromagnetic Heating cooker according to the utility model embodiment.
Fig. 3 is the circuit diagram of the power circuit of Electromagnetic Heating cooker according to another embodiment of the utility model.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Power circuit and the Electromagnetic Heating cooker of the Electromagnetic Heating cooker of the utility model embodiment are described with reference to the accompanying drawings.
Fig. 1 is the block diagram of the power circuit of Electromagnetic Heating cooker according to the utility model embodiment.As shown in Figure 1, the power circuit of this Electromagnetic Heating cooker comprises rectifier bridge 10, current limliting filter unit 20, switching power source chip 30, transformer 40, power supply feedback unit 50 and gate-controlled switch circuit 60.
Wherein, rectifier bridge 10 is for carrying out full-wave rectification to the electric main of input.Current limliting filter unit 20 is connected with rectifier bridge 10, and the first direct voltage that current limliting filter unit 20 pairs of rectifier bridges 10 export carries out current limliting filtering process to obtain the second direct voltage.Switching power source chip 30 is connected with current limliting filter unit 20, and switching power source chip 30 carries out high frequency chopping process to obtain pulse voltage to the second direct voltage.The armature winding of transformer 40 is connected with switching power source chip 30, pulse voltage is transformed into the first DC power supply V1 to be exported by armature winding by transformer 40, and the first DC power supply V1 is transformed into the second DC power supply V2 to be exported by the secondary winding of transformer 40.Gate-controlled switch circuit 60 is connected between the output of the first DC power supply V1 and the output of the second DC power supply V2, by the first DC power supply V1 and the second DC power supply V2, controllable switch unit 60 is by being associated that the voltage fluctuation of the second DC power supply V2 is fed back to the first DC power supply V1.Power supply feedback unit 50 is connected with switching power source chip 30 with the armature winding of transformer 40 respectively, power supply feedback unit 50 powers to switching power source chip 30, and the voltage fluctuation of the first DC power supply V1 is fed back to switching power source chip, regulate the voltage of the first DC power supply and the voltage of the second DC power supply to make switching power source chip 30 simultaneously.
According to an embodiment of the present utility model, the voltage of the first DC power supply V1 and the voltage of the second DC power supply V2 are multiple proportion.
According to an embodiment of the present utility model, as shown in Figure 2, power supply feedback unit 50 comprises: the first diode D1, first voltage-stabiliser tube Z1, first electric capacity C1 and the second electric capacity C2, wherein, the anode of the first diode D1 is connected with one end of armature winding, the negative electrode of the first diode D1 is connected with the feeder ear of switching power source chip 30, the anode of the first voltage-stabiliser tube Z1 is connected with the feedback end of switching power source chip 30, the negative electrode of the first voltage-stabiliser tube Z1 is connected with the negative electrode of the first diode D1, one end of first electric capacity C1 is connected with the feedback end of switching power source chip 30 with the anode of the first voltage-stabiliser tube Z1 respectively, the other end of the first electric capacity C1 is connected with the output of switching power source chip 30 with the other end of armature winding, one end of second electric capacity C2 is connected with the negative electrode of the first voltage-stabiliser tube Z1 with the negative electrode of the first diode D1 respectively, the other end of the second electric capacity C2 respectively with the other end of armature winding, the other end of the first electric capacity C1 is connected with the output of switching power source chip 30.
Specifically, as shown in Figure 2, the pulse voltage that switching power source chip 30 exports is transformed into the first DC power supply V1 and exports by the armature winding of transformer 40, the first stable DC power supply V1 is obtained after the 4th electric capacity C4 filtering, the voltage of this DC power supply can be 18V (being generally 18V in Electromagnetic Heating cooker), power to give the blower fan in Electromagnetic Heating cooker and switching device such as the critical pieces such as IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor).Simultaneously, the pulse voltage that switching power source chip 30 exports is transformed to the second DC power supply V2 and exports by the secondary winding of transformer 40, after the second diode D2 and the first filter capacitor CL1, obtain the second stable DC power supply V2, the voltage of this DC power supply can be 8V.
In addition, the the first DC power supply V1 exported through the armature winding of transformer 40 is not only as the power supply of switching power source chip 30, also as feedback signal back to switching power source chip 30 feedback end, and, gate-controlled switch circuit 60 is connected between the output of the first DC power supply V1 and the output of the second DC power supply V2, by the first DC power supply V1 and the second DC power supply V2, controllable switch unit 60 is by being associated that the voltage fluctuation of the second DC power supply V2 is fed back to the first DC power supply V1.When the voltage fluctuation of the second DC power supply V2, the voltage fluctuation of the second DC power supply V2 feeds back to the first DC power supply V1, and switching power source chip 30 adjusts according to the voltage of the first DC power supply V1 of feedback; When the voltage fluctuation of the first DC power supply V1, directly feed back to switching power source chip 30, switching power source chip 30 regulates according to the voltage signal of feedback, thus when making the voltage of the first DC power supply V1 and the second DC power supply V2 occur fluctuation, switching power source chip 30 can detect in real time and adjust the DC power supply exported, and ensures the DC power supply of stable output.
According to an embodiment of the present utility model, as shown in Figure 2, the power circuit of above-mentioned Electromagnetic Heating cooker also comprises sustained diode 5, the negative electrode of sustained diode 5 is connected with the output of switching power source chip 30 with the other end of armature winding respectively, the anode of the second diode D2 is connected with one end of secondary winding with the second diode D2 by the first filter capacitor CL1, and the plus earth GND of sustained diode 5, the other end ground connection GND of secondary winding.When the device of switching power source chip 30 inside turns off, carry out afterflow by sustained diode 5, provide discharge loop to give transformer 40.
According to an embodiment of the present utility model, as shown in Figure 2, gate-controlled switch circuit 60 comprises the first triode Q1 and the first resistance R1, wherein, the emitter of the first triode Q1 is connected with the output of the first DC power supply V1, the collector electrode of the first triode Q1 is connected with the output of the second DC power supply V2, and one end of the first resistance R1 is connected with the base stage of the first triode Q1, and the other end of the first resistance R1 is connected with the output of the second DC power supply V2.
According to an embodiment of the present utility model, as shown in Figure 2, gate-controlled switch circuit 60 also comprises: the second triode Q2 and the second resistance R2, the collector electrode of the second triode Q2 is connected with the other end of the first resistance R1, the grounded emitter GND of the second triode Q2, one end of second resistance R2 is connected with the base stage of the second triode Q2, the other end of the second resistance R2 is connected with the controller 70 of Electromagnetic Heating cooker, wherein, controller 70 exports control signal to control the second triode Q2 conducting when detecting that the voltage of the second DC power supply V2 is less than predetermined voltage threshold.Wherein, predetermined voltage threshold can be demarcated according to actual conditions.
Specifically, when there is voltage fluctuation in the second DC power supply V2, when voltage as the second DC power supply V2 reduces, controller 70 can export PWM (PulseWidthModulation, pulse width modulation) control signal or high level signal make the second triode Q2 conducting through the second resistance R2, after the second triode Q2 conducting, voltage between the collector electrode of the second triode Q2 and emitter reduces, the base voltage of the first triode Q1 is reduced, thus makes the first triode Q1 conducting.When the first triode Q1 conducting, the first DC power supply V1 supplements voltage to the second DC power supply V2 through the first triode Q1, effectively avoids the voltage of the second DC power supply V2 to be dragged down.Meanwhile, switching power source chip 30 detects that the voltage of the first DC power supply V1 reduces, switching power source chip 30 by the pulse duration of regulating impulse voltage to regulate the DC power supply exported.After the voltage stabilization of the second DC power supply V2, controller 70 controls the second triode Q2 and the first triode Q1 closes.
When voltage fluctuation appears in the first DC power supply V1, as switching power source chip 30 detects that the voltage of the first DC power supply V1 reduces, switching power source chip 30 by the pulse duration of regulating impulse voltage to regulate the DC power supply exported.
According to an embodiment of the present utility model, as shown in Figure 3, the power circuit of above-mentioned Electromagnetic Heating cooker also comprises: voltage-stabilizing device U1 and the second filter capacitor CL2, wherein, the input of voltage-stabilizing device U1 is connected with one end of the first filter capacitor CL1 with the negative electrode of the second diode D2 respectively, the other end ground connection GND of the first filter capacitor CL1, voltage-stabilizing device U1 generates the 3rd DC power supply V3 according to the second DC power supply V2 and exports, wherein, the voltage of the 3rd DC power supply V3 is less than the voltage of the second DC power supply V2, one end of second filter capacitor CL2 is connected with the output of voltage-stabilizing device U1, the other end ground connection GND of the second filter capacitor CL2, second filter capacitor CL2 carries out filtering process to the 3rd DC power supply V3.
Briefly, step-down and filtering can be carried out, with the 5V voltage of stable output by voltage-stabilizing device U1 and the second filter capacitor CL2 to the voltage of the second DC power supply V2 that the secondary winding of transformer 40 exports such as 8V.
In embodiments more of the present utility model, as shown in Figure 3, the power circuit of above-mentioned Electromagnetic Heating cooker can also comprise power conversion unit 80, power conversion unit 80 comprises the 4th resistance R4 and the 5th electric capacity C5 of series connection, wherein, one end of 4th resistance R4 respectively with one end of the armature winding of transformer 40, one end of 4th electric capacity C4 is connected, the other end of the 4th resistance R4 is connected with one end of the 5th electric capacity C5, the other end ground connection GND of the 5th electric capacity C5, between the other end of the 4th resistance R4 and one end of the 5th electric capacity C5, there is first node J1, and as the output of the 4th DC power supply V4.
In addition, as shown in Figure 2 or Figure 3, rectifier bridge 10 comprises the 3rd diode D3 and the 4th diode D4, wherein, 3rd diode D3 is connected with wherein one end of electric main respectively with the anode of the 4th diode D4,3rd diode D3 is connected with the negative electrode of the 4th diode D4, and electric main exports the first direct voltage after the 3rd diode D3 and the 4th diode D4 full-wave rectification.
Current limliting filter unit 20 comprises the 3rd resistance R3 and the 3rd electric capacity C3 of series connection, wherein, one end of 3rd resistance R3 is connected with the output of rectifier bridge 10, the other end of the 3rd resistance R3 is connected with one end of the 3rd electric capacity C3, the other end ground connection GND of the 3rd electric capacity C3, have Section Point J2 between the other end of the 3rd resistance R3 and one end of the 3rd electric capacity C3, Section Point J2 is connected with switching power source chip 30.The first direct voltage that rectifier bridge 10 exports is after the 3rd resistance R3 and the 3rd electric capacity C3 current limliting filtering, obtain the second direct voltage that voltage compare is high and stable, this direct voltage is that switching power source chip 30 such as VIPER12 powers, and switching power source chip 30 carries out high frequency chopping process to obtain pulse voltage to the second direct voltage.
Illustrate that switching power source chip 30 regulates the operation principle of the voltage of multi-channel dc power supply simultaneously below in conjunction with Fig. 3.
When there is fluctuation as 18V in the voltage of the first DC power supply V1, voltage such as the 18V of the first DC power supply V1 directly feeds back to switching power source chip 30 by the first diode D1 and the first voltage-stabiliser tube Z1, switching power source chip 30 by the pulse duration of regulating impulse voltage to obtain the first stable DC power supply V1.In addition, according to the operation principle of transformer 40, while the first DC power supply V1 is regulated, also can obtain the second stable DC power supply V2.
And when the voltage of the second DC power supply V2, as 8V, fluctuation occurs, as the first DC power supply V1 be in light-load mode time, the voltage of the second DC power supply V2 is reduced, now, control the first triode Q1 and the second triode Q2 conducting by controller 70, carry out voltage to make the first DC power supply V1 to the second DC power supply V2 and supplement.Supplement because the first DC power supply V1 carries out voltage to the second DC power supply V2, the voltage of the first DC power supply V1 is reduced, after switching power source chip 30 detects that the voltage of the first DC power supply V1 reduces, switching power source chip 30 by the pulse duration of regulating impulse voltage to regulate the DC power supply exported, thus the first DC power supply V1 of stable output and the second DC power supply V2.When the voltage stabilization of the second DC power supply V2, controller 70 controls the first triode Q1 and the second triode Q2 closes.Because the first DC power supply V1 and the second DC power supply V2 is more stable, therefore, the 3rd DC power supply V3 and the 4th DC power supply V4 is also more stable.
To sum up, as long as the road DC power supply that transformer exports fluctuates, voltage fluctuation signal feeds back in switching power source chip by capital, PWM adjustment is carried out according to feedback signal by switching power source chip, thus make the multi-channel dc power supply of output more stable, and greatly improve the interacting strip loading capability of multi-channel dc power supply.
According to the power circuit of the Electromagnetic Heating cooker of the utility model embodiment, the electric main of rectifier bridge to input carries out full-wave rectification to export the first direct voltage, current limliting filter unit carries out current limliting filtering process to obtain the second direct voltage to the first direct voltage, switching power source chip carries out high frequency chopping process to obtain pulse voltage to the second direct voltage, pulse voltage is transformed into the first DC power supply to be exported by armature winding by transformer, and the first DC power supply is transformed into the second DC power supply exports with the secondary winding by transformer, by the first DC power supply and the second DC power supply, controllable switch unit is by being associated that the voltage fluctuation of the second DC power supply is fed back to the first DC power supply, power supply feedback unit is powered to switching power source chip, and the voltage fluctuation of the first DC power supply is fed back to switching power source chip, regulate the voltage of the first DC power supply and the voltage of the second DC power supply to make switching power source chip simultaneously, improve the interactivity of the voltage of multi-channel dc power supply, and this power circuit can the direct voltage of stable output, improve the stability of cooker.
In addition, embodiment of the present utility model also proposed a kind of Electromagnetic Heating cooker, and it comprises the power circuit of above-mentioned Electromagnetic Heating cooker.
This Electromagnetic Heating cooker, by the power circuit of above-mentioned Electromagnetic Heating cooker, can improve the interactivity of the voltage of multi-channel dc power supply and the direct voltage of stable output, improve the stability of cooker.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In description of the present utility model, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment, revises, replace and modification in scope of the present utility model.
Claims (8)
1. a power circuit for Electromagnetic Heating cooker, is characterized in that, comprising:
For carrying out the rectifier bridge of full-wave rectification to the electric main of input;
Current limliting filter unit, described current limliting filter unit is connected with described rectifier bridge, and described current limliting filter unit carries out current limliting filtering process to obtain the second direct voltage to the first direct voltage that described rectifier bridge exports;
Switching power source chip, described switching power source chip is connected with described current limliting filter unit, and described switching power source chip carries out high frequency chopping process to obtain pulse voltage to described second direct voltage;
Transformer, the armature winding of described transformer is connected with described switching power source chip, described pulse voltage is transformed into the first DC power supply to be exported by described armature winding by described transformer, and described first DC power supply is transformed into the second DC power supply to be exported by the secondary winding of described transformer;
Gate-controlled switch circuit, described gate-controlled switch circuit is connected between the output of described first DC power supply and the output of described second DC power supply, by described first DC power supply and described second DC power supply, described controllable switch unit is by being associated that the voltage fluctuation of described second DC power supply is fed back to described first DC power supply;
Power supply feedback unit, described power supply feedback unit is connected with described switching power source chip with the armature winding of described transformer respectively, described power supply feedback unit powers to described switching power source chip, and the voltage fluctuation of described first DC power supply is fed back to described switching power source chip, with the voltage making described switching power source chip regulate the voltage of described first DC power supply and described second DC power supply simultaneously.
2. the power circuit of Electromagnetic Heating cooker as claimed in claim 1, it is characterized in that, the voltage of described first DC power supply and the voltage of described second DC power supply are multiple proportion.
3. the power circuit of Electromagnetic Heating cooker as claimed in claim 1, it is characterized in that, described power supply feedback unit comprises:
First diode, the anode of described first diode is connected with one end of described armature winding, and the negative electrode of described first diode is connected with the feeder ear of described switching power source chip;
First voltage-stabiliser tube, the anode of described first voltage-stabiliser tube is connected with the feedback end of described switching power source chip, and the negative electrode of described first voltage-stabiliser tube is connected with the negative electrode of described first diode;
First electric capacity, one end of described first electric capacity is connected with the feedback end of described switching power source chip with the anode of described first voltage-stabiliser tube respectively, and the other end of described first electric capacity is connected with the output of described switching power source chip with the other end of described armature winding;
Second electric capacity, one end of described second electric capacity is connected with the negative electrode of described first voltage-stabiliser tube with the negative electrode of described first diode respectively, and the other end of described second electric capacity is connected with the output of described switching power source chip with the other end of described armature winding, the other end of described first electric capacity respectively.
4. the power circuit of Electromagnetic Heating cooker as claimed in claim 3, is characterized in that, also comprise:
Fly-wheel diode, the negative electrode of described fly-wheel diode is connected with the output of described switching power source chip with the other end of described armature winding respectively, the anode of described second diode is connected with the second diode one end with described secondary winding by the first filter capacitor, and the plus earth of described fly-wheel diode, the other end ground connection of described secondary winding.
5. the power circuit of Electromagnetic Heating cooker as claimed in claim 4, is characterized in that, also comprise:
Voltage-stabilizing device, the input of described voltage-stabilizing device is connected with one end of the first filter capacitor with the negative electrode of described second diode respectively, the other end ground connection of described first filter capacitor, described voltage-stabilizing device generates the 3rd DC power supply according to described second DC power supply and exports, wherein, the voltage of described 3rd DC power supply is less than the voltage of described second DC power supply;
Second filter capacitor, one end of described second filter capacitor is connected with the output of described voltage-stabilizing device, the other end ground connection of described second filter capacitor, and described second filter capacitor carries out filtering process to described 3rd DC power supply.
6. the power circuit of Electromagnetic Heating cooker as claimed in claim 1, it is characterized in that, described gate-controlled switch circuit comprises:
First triode, the emitter of described first triode is connected with the output of described first DC power supply, and the collector electrode of described first triode is connected with the output of described second DC power supply;
First resistance, one end of described first resistance is connected with the base stage of described first triode, and the other end of described first resistance is connected with the output of described second DC power supply.
7. the power circuit of Electromagnetic Heating cooker as claimed in claim 6, it is characterized in that, described gate-controlled switch circuit also comprises:
Second triode, the collector electrode of described second triode is connected with the other end of described first resistance, the grounded emitter of described second triode;
Second resistance, one end of described second resistance is connected with the base stage of described second triode, the other end of described second resistance is connected with the controller of described Electromagnetic Heating cooker, wherein, described controller exports control signal to control described second triode ON when detecting that the voltage of described second DC power supply is less than predetermined voltage threshold.
8. an Electromagnetic Heating cooker, is characterized in that, comprises the power circuit of the Electromagnetic Heating cooker according to any one of claim 1-7.
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| CN201520503702.1U CN204795668U (en) | 2015-07-13 | 2015-07-13 | Power supply circuit of electromagnetic heating culinary art device and electromagnetic heating culinary art device |
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| CN201520503702.1U CN204795668U (en) | 2015-07-13 | 2015-07-13 | Power supply circuit of electromagnetic heating culinary art device and electromagnetic heating culinary art device |
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| CN204795668U true CN204795668U (en) | 2015-11-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107066005A (en) * | 2017-04-18 | 2017-08-18 | 深圳市菲菱科思通信技术股份有限公司 | A kind of power switch and voltage regulating and controlling circuit |
| CN107592690A (en) * | 2016-07-06 | 2018-01-16 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating cooker, the drive circuit of power switch pipe and its method |
| CN108258978A (en) * | 2018-03-07 | 2018-07-06 | 深圳市沃特沃德股份有限公司 | Motor control assembly |
| CN109417836A (en) * | 2016-12-27 | 2019-03-01 | 惠而浦公司 | Inexpensive solid-state RF generating system for electromagnetism culinary art |
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2015
- 2015-07-13 CN CN201520503702.1U patent/CN204795668U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592690A (en) * | 2016-07-06 | 2018-01-16 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating cooker, the drive circuit of power switch pipe and its method |
| CN107592690B (en) * | 2016-07-06 | 2020-09-01 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking device, power switch tube driving circuit and method thereof |
| CN109417836A (en) * | 2016-12-27 | 2019-03-01 | 惠而浦公司 | Inexpensive solid-state RF generating system for electromagnetism culinary art |
| CN109417836B (en) * | 2016-12-27 | 2021-04-16 | 惠而浦公司 | Solid state radio frequency generation system and electromagnetic cooking device |
| US11057969B2 (en) | 2016-12-27 | 2021-07-06 | Whirlpool Corporation | Low cost solid state RF generation system for electromagnetic cooking |
| CN107066005A (en) * | 2017-04-18 | 2017-08-18 | 深圳市菲菱科思通信技术股份有限公司 | A kind of power switch and voltage regulating and controlling circuit |
| CN107066005B (en) * | 2017-04-18 | 2019-11-08 | 深圳市菲菱科思通信技术股份有限公司 | A kind of power switch and voltage regulating and controlling circuit |
| CN108258978A (en) * | 2018-03-07 | 2018-07-06 | 深圳市沃特沃德股份有限公司 | Motor control assembly |
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