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In today that people's living standard is improved constantly, people require also more and more higher to taste of food.Taste of food, Foodstuff is depended not only on, it is also closely related with cooking level, and the height of cooking level, it is often depending on the palm of the duration and degree of heating Hold, and the grasp of the duration and degree of heating, it is often relevant with the control accurate of heating-up temperature.And for electric heating equipment, how to provide energy Enough be easier to the electric heating equipment product of accurate temperature control, then become product possess a material impact of the market competitiveness because Element.
In current kitchen firing equipment, mainly there are heated by natural gas and electric power heating two ways.Set in electric power heating In standby, and mainly there is the product of heating using microwave, Electromagnetic Heating and resistance heating three types.Wherein, although resistive is heated Have the shortcomings that heat transfer efficiency is relatively low, but, its pair can the material of heating vessel limit few, with preferable versatility.And it is micro- Ripple and Electromagnetic Heating have more special restriction to heating vessel material, and such as microwave can not heat metalware, Electromagnetic Heating pair Under the efficiency of heating surface of low-permeability material, etc..Therefore, the electric heating equipment product of resistance heating class, in family, kitchen In use it is more extensive.
Compared to prior art, technological merit of the utility model based on the electric heating equipment of pulsewidth modulation is that it passes through Increasing temperature sensor in the heating dish for laying heating wire carries out temperature acquisition and feedback, with reference to occupancy controller and pulsewidth Modulation circuit, is controlled by the average heating power of heating wire such that it is able to realize to specifying heating-up temperature to be precisely controlled, Solve the problems, such as that traditional electric heating equipment is difficult to accurate temperature control heating.Electric cooker with the electric heating equipment can not only Realize that electrical automation controls cooking rice, be also equipped with the advantage being precisely controlled of heating-up temperature.The electric heating equipment can be with In being applied to other electric heating function products, with good market application foreground.
In the above-mentioned electric heating equipment based on pulsewidth modulation, preferably, the heating wire for multigroup, respectively with it is inverse The output end for becoming circuit is in parallel, and each group heating wire is coiled in heating dish in concentric ring-shaped distribution, the TEMP Device is arranged in heating dish at the position being located therein between the heating wire of two groups of concentric ring-shaped coilings.
A kind of electric heating equipment based on pulsewidth modulation, including heating dish, are laid with for as heating source in heating dish Heating wire, temperature sensor is also equipped with the heating dish, also including pulsewidth modulation heating control circuit&#;The pulsewidth is adjusted Heating control circuit processed includes rectifier circuit, filter circuit, inverter circuit, pulse-width modulation circuit and occupancy controller, institute The input connection AC power of rectifier circuit is stated, the output end of rectifier circuit is connected with the input of inverter circuit, The output end of inverter circuit is connected with heating wire, and the reverse frequency control end of inverter circuit is believed with the modulation of pulse-width modulation circuit Number output end is connected, the pulse-width controlled input of pulse-width modulation circuit and the duty cycle signals output end phase of occupancy controller Connection, the signal input part of occupancy controller is connected with the induced signal output end of temperature sensor.
For above-mentioned deficiency present in prior art, the utility model purpose is to provide a kind of based on pulsewidth modulation Electric heating equipment, it can be based on pulsewidth modulation realization to specifying the control of heating-up temperature, so as to be more easily implemented accurate temperature control Operation, solves the problems, such as that traditional electric heating equipment is difficult to accurate temperature control heating.
Specific embodiment
When flowing through electric current in electrical resistance, heat can be produced, using resistance fuel factor as thermal source, can be heated for vessel.This Plant resistance and be also referred to as heating wire.The heat produced on heating wire is relevant with the power of resistance consumption&#;
P=UI=I2R&#; (1)
Every implication is in formula (1)&#;
P-heating wire average consumed power&#;
The resistance of R-heating wire&#;
U-supply voltage&#;
Electric current on I-heating wire.
In formula (1), if power supply is dc source, U represents the voltage of dc source, and I represents the electric current of dc source&#;If Power supply is that alternating current, then U and I then represent their virtual value.The power supply for using in daily life is alternating current, virtual value 220V, the resistance of heating wire is believed that approximate constant, and thus, once when heating wire resistance fixed, the power P for consuming thereon keeps It is constant.
If increasing switch to the current supply circuit of heating wire, Us represents the dc source powered to heating wire, and R represents heating wire Resistance, S is switch, it is assumed that the S opening and closing of times are respectively T1 and T2, definition&#;
T=T1+T2&#; (2)
If the T in expression formula (2) is fixed value, have&#;
D=T2/T&#; (3)
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D in formula (3) is dutycycle, and the span of D is [0,1], and the mean power consumed on resistance R is&#;
In formula (4), I is to switch electric current when S is closed on resistance R, is certain value.It can thus be seen that being accounted for by change The empty size than D, can be to heating wire mean power [0, I2R] interval interior regulation, thus just can reach to heating-up temperature Precise control.
Based on above-mentioned know-why, the utility model provides a kind of electric heating equipment based on pulsewidth modulation, such as Fig. 1 Shown, it includes heating dish 100, is laid with heating dish 100 for as the heating wire 200 of heating source, going back in heating dish 100 It is provided with temperature sensor 300, and the electric heating equipment and also (does not show in FIG including pulsewidth modulation heating control circuit Go out).The structured flowchart of pulsewidth modulation heating control circuit is as shown in Fig. 2 it includes rectifier circuit, filter circuit, inversion electricity Road, pulse-width modulation circuit and occupancy controller, the input connection AC power of the rectifier circuit, rectifier circuit Output end is connected with the input of inverter circuit, and the output end of inverter circuit is connected with heating wire, the inversion of inverter circuit Frequency control terminal is connected with the modulated signal output end of pulse-width modulation circuit, the pulse-width controlled input of pulse-width modulation circuit with The duty cycle signals output end of occupancy controller is connected, the signal input part of occupancy controller and the sense of temperature sensor Induction signal output end is connected.
The utility model is based on the electric heating equipment of pulsewidth modulation, and its course of work is&#;AC power is by rectifier bridge electricity Road is rectified into direct current, and after filtering after circuit, being transformed into frequency and dutycycle by inverter circuit can connect within the specific limits Continue adjustable single phase ac electricity output to heating wire, this is exported can regard as with certain frequency to the single-phase alternating current of heating wire Rate carries out the direct current of on/off switching, and when being powered, heating wire has electric current to pass through, and heating wire produces heat, when power is off electric heating Line no current passes through, and heating wire does not produce heat, and then by occupancy controller by controlling what pulse-width modulation circuit was exported The dutycycle of pulse-width signal and realize to inverter circuit output single-phase alternating current dutycycle and frequency adjusted, from And reach the heating mean power of control heating wire, realize the purpose that heating-up temperature is adjusted&#;Simultaneously as also installing in heating dish There is temperature sensor, can detect in real time be heated in heating dish the temperature of vessel, and feed back to occupancy controller, therefore account for It is empty to be compared with the real time temperature of temperature sensor feedback according to the heating-up temperature that its setting is specified than controller, adjust it The duty cycle signals of output, so as to more accurately control the requirement that heating wire reaches specified heating-up temperature.
In electric heating equipment of the utility model based on pulsewidth modulation, when being embodied as, the heating wire in heating dish can So that using multigroup design, each group heating wire is in parallel respectively with the output end of inverter circuit, to carry to each group heating wire For supply voltage in a balanced way, and as a kind of preferred layout type, as shown in figure 1, each group heating wire 200 can be designed being in Concentric ring-shaped distribution is coiled in heating dish 100, while the design and installation of temperature sensor 300 is located at it in heating dish 100 In the coiling of two groups of concentric ring-shapeds heating wire between position at.The benefit of so design is that multigroup heating wire is in concentric circles Annular distribution is coiled in heating dish, forms a specific thermal treatment zone, and is powered in a balanced way because each group heating wire possesses Voltage, can cause the heating uniformity at each position in the thermal treatment zone good, while temperature sensor position can Accurately detect the temperature conditions of the thermal treatment zone, there is provided accurate temperature feedback information.Certainly, heating wire and temperature sensor are adding Layout type in hot plate can also adopt other designs, as long as disclosure satisfy that the tool of temperature feedback detection and computer heating control Body demand.
The concrete application structure of temperature sensor, then can adopt the armouring copper thermistor in heating dish, then Combined with Radiotherapy The form of big circuit realizing, temperature sensor output voltage can be amplified to into 0 using electric bridge and differential amplifier circuit&#; 5 volts of scopes, it is possible to so that the measurement temperature scope of temperature sensor reaches -50 DEG C to+150 DEG C.If necessary to design temperature The measurement temperature of sensor is higher than 150 DEG C, then its measurement resistance can adopt platinum resistance thermometer sensor,.
As in pulsewidth modulation heating control circuit, rectifier circuit can adopt single phase bridge type rectifier circu, and can AC power is connected to by transformer coupled with the input for designing single phase bridge type rectifier circu, to realize that transformation is changed. Inverter circuit can (Insulated Gate Bipolar Transistor, be abbreviated as using insulated gate bipolar transistor IGBT), correspondingly, pulse-width modulation circuit then can be designed as IGBT drive module, and occupancy controller can then be designed and adopted With the microprocessor for being integrated with pulse width modulation duty control unit, such as conventional PIC16F877A type microprocessors, AVR The single-chip microcomputer that Mega series microprocessors etc. are 8, or the 32-bit microprocessor of STM32 series etc., according to practical situations Demand and determine&#;Since so, microprocessor just can control IGBT drive module by way of photoelectric coupling, finally reach The function of pulse width modulation controlled, the more stable reliability of control process are realized to control IGBT break-makes, and insulated gate bipolar is brilliant The fault rate of body pipe is low, long service life, so as to contribute to lifting the resistance to overturning of the utility model electric heating equipment product Energy.
Electric heating equipment of the utility model based on pulsewidth modulation, can also be various to be applied to by further design Different application scenarios.For example, the temperature control curve for storing various different heating patterns can be preset in its occupancy controller, And in electric heating equipment increase man-machine interaction display unit, for example digital display tube with input button integrated unit, touch Screen input display unit etc. is touched, for providing the selection operation of presentation of information and different heating pattern, and certain heating is selected After pattern, occupancy controller is just according to the real-time specified heating temperature for adjusting not in the same time of temperature control curve of corresponding heating mode Angle value, and compare with the real time temperature of temperature sensor feedback, the computer heating control that heating-up temperature changes with time graph is realized, And also further can be performed using pid control algorithm or FUZZY ALGORITHMS FOR CONTROL in occupancy controller specify plus Contrast calculation process between hot temperature and the real time temperature of temperature sensor feedback, so as to further improve with temperature control curve Carry out the precision of heating-up temperature regulation.Meanwhile, the utility model is based on the heating wire in the electric heating equipment of pulsewidth modulation also Different specifications can be selected according to actual demand.Since so, the utility model is set based on the electrical heating of pulsewidth modulation It is standby, it becomes possible to suitable for various different application scenarios&#;For example, pre-set in electric heating equipment for chafing dish heated mould Formula, cooking heating mode, the different temperature control curves of boiling heating mode, so as to control automatically when user selects different heating pattern The heating-up temperature of different periods processed, compared to traditional heating equipment, just need not re-recognize for the temperature of the whole heating process of control Adjust, and also can further combine some intelligent, Functional Designs of Internet of Things networking, such as voice broadcast menu and stream Journey, selected by the long-range computer heating control of networked realization and heating mode, etc..
Additionally, the utility model is also applied to other electric heating functions based on the electric heating equipment of pulsewidth modulation producing In product.For example, the utility model can apply to electric cooker based on the electric heating equipment of pulsewidth modulation, add as the electricity of electric cooker Hot cell.As a kind of specific embodiment of the electric cooker with the electric heating equipment, as shown in figure 3, it includes that overall is in bucket The entirety arranged in pot 2 of the shape upper end with pot cover 1, the inner chamber on the top of pot 2 is in the inner bag 3 of tubbiness and is arranged in pot Electric heating unit, the electric heating unit be utility model based on pulsewidth modulation electric heating equipment, electric heating unit include position In the heating dish 4 that the laminating of inner bag lower section is arranged, wherein, the bottom surface of the inner bag 3 middle part is provided with water hole, water hole bottom patch Closing linking has an outlet pipe 5 for being fixed on pot straight down, and electromagnetic valve switch 6 is provided with outlet pipe 5, and heating dish 4 sets The surrounding of outlet pipe 5 is placed in, also installation settings has a meal ware 7 in inner bag 3, meal ware 7 includes a column and positioned at column bottom Filter screen, distillation space is left between the lower section of meal ware 7 and inner bag inner bottom surface.So, when cooking, rice is put in meal ware, closes The electromagnetic valve switch closed on outlet pipe, is subsequently adding water and enters inner bag, floods the height of rice.Open electric heating unit and be heated to boiling Rise, then open electromagnetic valve switch, release a part of thin rice gruel, stay a part of thin rice gruel in inner bag, continue to heat, until meal is steamed It is ripe.Drip rice boiling is achieved in that, easy to operate with simple structure, time saving and energy saving advantage, the thin rice gruel of releasing can be collected It is edible.
In the present embodiment, also there is the lower chamber positioned at bottom in the pot 2, a rice is shelved with lower chamber Soup container 8, the lower end of outlet pipe 5 is right against the setting of the upper port of thin rice gruel container 8, and lower chamber side opens up and is equipped with chamber door and supplies thin rice gruel Container 8 takes out.So, facilitate thin rice gruel to collect thin rice gruel container directly to eat.During enforcement, outlet pipe directly exhausting type can also set Put.
In the present embodiment, interior gallbladder intracavity lower surface middle part has circle drip ring 9 upwards, and water hole is located at drip ring 9 It is interior.So, release thin rice gruel when, retain part thin rice gruel automatically by drip ring and steamed rice completed in inner bag, it is ensured that thin rice gruel it is quantitative Retention, it is ensured that the reliability of follow-up steamed rice.When implementing certainly, it is also possible to right by being realized by the switch control rule to electromagnetic switch valve The retention of thin rice gruel.
In the present embodiment, the circumferential surface of internal cavity of meal ware 7 has the draw-in groove of a circle indent, card in draw-in groove near upper end position Connect and be provided with a bamboo filter disc 10, the both sides of the peripheral outer wall of meal ware 7 are radially horizontally outward extended to be had rotating shaft and lean on Rotating shaft is installed in rotation in the inner chamber on pot top, and rotating shaft controlling organization is additionally provided with pot.As such, it is possible to cook When rice be immersed in water by meal ware cook, during steamed rice, meal ware can be controlled and overturn 180 °, rice grain is dropped into into bamboo filter disc In realize steamed rice, so remain the bamboo fragrance of steamed rice so that steamed rice grain more it is good to eat also more conforms to part like bamboo Steam the eating habit of the person of missing old times or old friends of cylinder steamed rice.When bamboo filter disc is provided with meal ware, inner bag can be fixed as one with pot Arrange, facilitate the installation of rotating shaft.When implementing certainly, it is also possible to be not provided with bamboo filter disc, in this case can by inner bag Releasably insert and be shelved in pot.
In the present embodiment, the meal ware 7 is obtained for stainless steel material.So, convenient boiling in water is boiled.Certainly, during enforcement, Can also be using other materials such as ceramic materials.
In the present embodiment, the rotating shaft controlling organization includes a stepper motor 11 being located in pot, stepper motor 11 It is connected and is controlled with the control module in pot, the output shaft of stepper motor 11 and rotating shaft transmission connects.So, by stepping Motor facilitates the upset of control realization meal ware.When implementing certainly, it would however also be possible to employ other rotating shaft controlling organizations, such as directly set Put a rotating handles for extending pot to be manually controlled.In addition, when implementing, can be straight between stepper motor and rotating shaft Connect connected, it is also possible to make its convenient control to adjust gearratio by gear drive connection.
In the present embodiment, the control module rocks control circuit unit including one, for controlling stepper motor output Crankmotion.As such, it is possible in steamed rice, reciprocal vibration can be produced with meal ware or be rocked, allow the grain of rice is full and uniform to be received Heat, expansion is full, drastically increases the mouthfeel and quality of the rice for steaming.
In the present embodiment, the electromagnetic valve switch 6 is connected with heating dish 4 with control module.
In sum, it can be seen that electric heating equipment of the utility model based on pulsewidth modulation is by laying heating wire Heating dish on increase temperature sensor carry out temperature acquisition and feedback, it is right with reference to occupancy controller and pulse-width modulation circuit The average heating power of heating wire is controlled by such that it is able to realize, to specifying heating-up temperature to be precisely controlled, solving tradition Electric heating equipment is difficult to the problem of accurate temperature control heating, and also can be based on electricity of the utility model based on pulsewidth modulation Firing equipment can be applied to various different application scenarios by further design, meet different demand for heat, With good market application foreground.
Finally illustrate, above example is only unrestricted to illustrate the technical solution of the utility model, although ginseng The utility model has been described in detail according to preferred embodiment, it will be understood by those within the art that, can be to this The technical scheme of utility model is modified or equivalent, without deviating from the objective and model of technical solutions of the utility model Enclose, it all should cover in the middle of right of the present utility model.
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