CN201323669Y - Control device of continuous heating during low power period of electromagnetic oven - Google Patents
Control device of continuous heating during low power period of electromagnetic oven Download PDFInfo
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- CN201323669Y CN201323669Y CNU2008202043143U CN200820204314U CN201323669Y CN 201323669 Y CN201323669 Y CN 201323669Y CN U2008202043143 U CNU2008202043143 U CN U2008202043143U CN 200820204314 U CN200820204314 U CN 200820204314U CN 201323669 Y CN201323669 Y CN 201323669Y
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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Abstract
The utility model discloses a control device of continuous heating during low power period of an electromagnetic oven, comprising a power supply circuit (1), a central processing unit (2), a discharging circuit (3), a control circuit (4), a resonance circuit (5), a commercial power zero passage detecting circuit (6) and a power tube (IGBT); wherein the power supply circuit (1) respectively supplies power to the central processing unit (2), the discharging circuit (3), the control circuit (4), the resonance circuit (5), the commercial power zero passage detecting circuit (6) and the power tube (IGBT); a signal output terminal of the commercial power zero passage detecting circuit (6) is connected to the input terminal of the central processing unit (2), and the output terminal of the central processing unit (2) is respectively connected to input terminals of the discharging circuit (3) and the control circuit (4), and the output terminal of the control circuit (4) is connected to the input terminal of the resonance circuit (5), and the output terminal of the resonance circuit (5) is connected to the power tube (IGBT). The utility model not only solves the problem of low power continuous heating, but also reduces the cost and enhances cost performance of the product.
Description
Technical field
The utility model is the continuous heating control apparatus of a kind of electromagnetic oven low-power section, belongs to the renovation technique of the continuous heating control apparatus of electromagnetic oven low-power section.
Background technology
Electromagnetic oven with its flames of anger culinary art, environmental protection, multifunctionality, simple operation and other advantages, is subjected to consumers in general's favor as a kind of kitchen tools product of emerging fashion day by day.The power of present normal domestic use electromagnetic oven on the market is generally below 2200W, can both very reliablely and stablely realize for the function of these classes such as chafing dish, cooking based on high-power demand, but for Baoshang, this class such as cook congee, stew slowly for the function of low-power requirements, mode most or that lean on heat intermittence realizes that this all has a greatly reduced quality to food cooking effect and nutrition aspect.This mainly ascribes common single tube (i.e. 1 power tube IGBT) to, and when electromagnetic oven is operated in the continuous gear of small-power by normal power voltage power tube IGBT can't accomplish zero voltage switch, so switching loss is very big, heating is serious, can not the work of normal reliable ground.
Though, also there is automatically controlled plate producer that this low-power is heated a difficult problem continuously and made technical breakthrough, but mainly all still be that the method for controlling the input voltage of reduction resonant tanks such as halfwave rectifier or controllable silicon copped wave by relay realizes, the cost of its increase is higher, makes that product competitiveness aspect cost performance is influenced.
The utility model content
The purpose of this utility model is to consider the problems referred to above and a kind of low-power difficult problem of heating continuously that both solved is provided, and has reduced cost again as far as possible, has increased the continuous heating control apparatus of electromagnetic oven low-power section of cost performance of product.
The technical solution of the utility model is: include power circuit, CPU, discharge circuit, control circuit, resonant circuit, civil power zero cross detection circuit and power tube, wherein power circuit is given CPU respectively, discharge circuit, control circuit, resonant circuit, civil power zero cross detection circuit and power tube power supply, the signal output part of civil power zero cross detection circuit is connected with the input of CPU, the output of CPU is connected with the input of discharge circuit and control circuit respectively, the output of control circuit is connected with the input of resonant circuit, and the output of resonant circuit is connected with power tube.
Above-mentioned CPU is a single-chip microcomputer.
Above-mentioned civil power zero cross detection circuit includes resistance R 1, R2, RJ1, triode Q1, the wherein grounded emitter of triode Q1, the base stage of triode Q1 is connected with the end of resistance R J1 and an end of resistance R 1 respectively, the other end ground connection of resistance R J1, the other end of resistance R 1 is connected with power circuit by diode D3 and is connected with diode D1, D2, and the input of diode D1, D2 is electrically connected with the city, output is connected with rectifier bridge DB1, and the collector electrode of triode Q1 is connected with power supply by resistance R 2.
Above-mentioned discharge circuit includes resistance R 3, R6, R7, triode Q2, the wherein grounded emitter of triode Q2, the collector electrode of triode Q2 is connected with an end of choke L1 and capacitor C 1 by resistance R 3, and the other end ground connection of capacitor C 1 reaching is connected with the output of rectifier bridge DB1, and the other end of choke L1 is connected with the output of rectifier bridge DB1, the base stage of triode Q2 respectively with resistance R 6, R7 connects, the other end ground connection of resistance R 6, and the other end of resistance R 7 is connected with CPU.
The above-mentioned resonant circuit that includes includes capacitor C 2 and inductance L 2, capacitor C 2 is connected with resistance R 3, choke L1 and capacitor C 1 respectively with an end of the parallel circuits that inductance L 2 is formed, capacitor C 2 is connected with power tube with the other end of the parallel circuits that inductance L 2 is formed, and capacitor C 2 is introduced control circuit by resistance R 4, R5 with the synchronizing signal of resonant circuit (5) respectively with the two ends of the parallel circuits of inductance L 2 compositions.
Go back and be connected to resistance R 8 and voltage stabilizing didoe ZD1 between the base stage of above-mentioned power tube and the emitter.
The utility model compared with prior art has following outstanding advantage:
1) the utility model switches fully by software control the high or low power section of electromagnetic oven complete machine, when need are exported when high-power, discharge circuit is not worked, the working method of other all circuit and parameter are fully consistent with traditional circuit, promptly can not increase extra energy loss (heat power consumption), keep traditional scheme high-power section advantage; When needs output low-power, control by scm software, change traditional cycle into discontinuous operation that the cycle is a Millisecond for second intermittent duty of level, the work of the discharge signal of single-chip microcomputer output simultaneously control discharge circuit, and the zero passage of the action of start-stop intermittently and input civil power and the work of discharge circuit are synchronous, i.e. the startup of resonant circuit and stop all to occur in the civil power near zero-crossing point.
When 2) the utility model made the electromagnetic oven complete machine be operated in the small-power section, the instantaneous electrical quantity of resonant circuit was identical in the time of can keeping with high power CW work, i.e. the work of IGBT can be satisfied the no-voltage turn-on condition, thereby guarantees that caloric value is little, and working stability is reliable.
3) the utility model is because its control method still is the discontinuous operation in Millisecond cycle in essence, so the evenly heat loss of IGBT itself is very little.
4) the utility model makes electromagnetic oven complete machine power output size change this intermittently used break-make by scm software recently to control, and also can change the pwm signal size of exporting to control circuit by scm software and control, and the power adjustment is very flexible.
5) the utility model is compared with traditional controlling schemes, owing to only increased zero cross detection circuit and discharge circuit, and the device of forming these circuit is very common cheap device, so the utlity model has good price advantage.
The utility model is that a kind of design is ingenious, function admirable, the control device of convenient and practical temperaturing control pressure pot.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model;
Fig. 3 is the waveform of civil power after full-wave rectification and the waveform schematic diagram of zero cross signal;
Fig. 4 be electromagnetic oven high-power section running hours IGBT back-pressure end (being the node side that its source electrode links to each other with resonant inductance L2) waveform envelope line (the first half among the figure) and when the low-power section is worked the contrast schematic diagram of waveform envelope line (the latter half among the figure).
Embodiment
Embodiment
Theory diagram of the present utility model as shown in Figure 1, include power circuit 1, CPU 2, discharge circuit 3, control circuit 4, resonant circuit 5, civil power zero cross detection circuit 6 and power tube IGBT, wherein power circuit 1 is given CPU 2 respectively, discharge circuit 3, control circuit 4, resonant circuit 5, civil power zero cross detection circuit 6 and power tube IGBT power supply, the signal output part of civil power zero cross detection circuit 6 is connected with the input of CPU 2, the output of CPU 2 is connected with the input of discharge circuit 3 and control circuit 4 respectively, the output of control circuit 4 is connected with the input of resonant circuit 5, and the output of resonant circuit 5 is connected with power tube IGBT.In the present embodiment, CPU 2 is a single-chip microcomputer.
Circuit theory diagrams of the present utility model as shown in Figure 2, above-mentioned civil power zero cross detection circuit 6 includes resistance R 1, R2, RJ1, triode Q1, the wherein grounded emitter of triode Q1, the base stage of triode Q1 is connected with the end of resistance R J1 and an end of resistance R 1 respectively, the other end ground connection of resistance R J1, the other end of resistance R 1 is connected with power circuit 1 by diode D3 and is connected with diode D1, D2, the input of diode D1, D2 is electrically connected with the city, and output is connected with rectifier bridge DB1, and the collector electrode of triode Q1 is connected with power supply by resistance R 2.
Above-mentioned discharge circuit 3 includes resistance R 3, R6, R7, triode Q2, the wherein grounded emitter of triode Q2, the collector electrode of triode Q2 is connected with an end of choke L1 and capacitor C 1 by resistance R 3, and the other end ground connection of capacitor C 1 reaching is connected with the output of rectifier bridge DB1, and the other end of choke L1 is connected with the output of rectifier bridge DB1, the base stage of triode Q2 respectively with resistance R 6, R7 connects, the other end ground connection of resistance R 6, and the other end of resistance R 7 is connected with CPU 2.
The above-mentioned resonant circuit 5 that includes includes capacitor C 2 and inductance L 2, capacitor C 2 is connected with resistance R 3, choke L1 and capacitor C 1 respectively with an end of the parallel circuits that inductance L 2 is formed, capacitor C 2 is connected with power tube IGBT with the other end of the parallel circuits that inductance L 2 is formed, and capacitor C 2 is introduced control circuit 4 by resistance R 4, R5 with the synchronizing signal of resonant circuit 5 respectively with the two ends of the parallel circuits of inductance L 2 compositions.
Go back and be connected to resistance R 8 and voltage stabilizing didoe ZD1 between the base stage of above-mentioned power tube IGBT and the emitter.
Above-mentioned power circuit 1 and control circuit 4 can adopt existing circuit.
Fig. 3 is the waveform of civil power after full-wave rectification and the waveform schematic diagram of zero cross signal, and the waveform of zero cross signal is the square wave of a standard, and the width of its high level is mainly determined by the size of input voltage and the parameter of zero crossing circuitry.The maximum duration that single-chip microcomputer continues by the width decision discharge signal that detects this high level, only single-chip microcomputer is just exported discharge signal when zero cross signal is high level state.Fig. 4 be electromagnetic oven high-power section running hours IGBT back-pressure end (being the node side that its source electrode links to each other with resonant inductance L2) waveform envelope line (the first half among the figure) and when the low-power section is worked the contrast schematic diagram of waveform envelope line (the latter half among the figure).
The utility model extends the control thought of traditional heating at intermittence, the PWM control method is directly applied to the resonant circuit road: the interruption cycle foreshortened to several milliseconds to a few tens of milliseconds by several seconds to tens seconds, was about to chopper frequency and expanded as original hundred times.Like this, the work of resonant tank is intermittently several times to tens times within 1 second, the energy that obtains on pan (heat energy) also is to repeat by this frequency, and because the slow characteristics of variation of heat and this analoglike amount of temperature, its heat and temperature remain variation and corresponding with this make-to-break ratio equably, recently regulate power output so adjust this break-make by software.In foregoing circuit, C2 and inductance L 2 constitute the resonant circuit of power conversion; Discharge circuit is subjected to the discharge signal of single-chip microcomputer output to come C1 is discharged.Resistance R 4, R5 introduces control circuit with the synchronizing signal of resonant circuit, and the single-chip microcomputer output pwm signal is adjusted the ON time of IGBT to control circuit; Control the starting of The whole control circuit and resonant circuit and stop by the start-up control signal.
The key point that the utility model is implemented is:
1, the start-up control signal by single-chip microcomputer output is given to control circuit 4, and resonant circuit 5 is constantly stopped after the startup by a higher frequency, thereby produces the discontinuous operation in Millisecond cycle.Enabling signal by the control of the Control Software of single-chip microcomputer inside must satisfy: make and break period is the integral multiple of civil power cycle half, calculates the integral multiple that is 10 milliseconds by the civil power of 220VAC/50Hz, and synchronous with the civil power zero crossing.This be because civil power when zero crossing, rectifier bridge DB1 is in by state, energy stored is less in capacitor C 1 and the inductance L 1, it is less to the electromagnetic stress that pan produces to start or stop resonant tank this moment, the noise that pan produces is less.
2, before each resting period starts, must the electric charge on the C1 be discharged by discharge circuit 3, make its voltage drop below zero passage voltage, and then pass through the resonance work of a start-up control signal enabling new round.The reason of doing like this is in order to reduce the electromagnetic force size that pan is subjected to when each starts in cycle equally, thereby further noise is dropped to minimum.Concrete steps are: the rising edge of civil power zero cross signal triggers the external interrupt of single-chip microcomputer, it is exported discharge signal immediately and begins C1 is discharged, pick up counting simultaneously, the control program of single-chip microcomputer is by judging the size of voltage AD, draw optimum discharge time (being made as t) according to software algorithm, when reach t discharge time or the trailing edge of zero cross signal when arriving, single-chip microcomputer is cancelled discharge signal immediately, exports enabling signal then and starts resonant tank work.
Duty ratio with Fig. 4 is an example, presses the input of 220VAC/50Hz civil power, and the operating state of circuit and major parameter are:
Be the t moment discharge time, capacitor C
1On voltage be: U
C=311*e
(-t/R3*C1), actual parameter is got the cement resistor that R3 is 90 Ω/4W, and C1 is a 4uF metal film electric capacity, when discharge time, t was 1ms, can calculate U
C=19.3V, the average power that consumes on the whole resting period 100ms content resistance R 3 is: 1.9W, the instantaneous maximum current among the triode Q2 is U
C/ R3=3.45A.
When the low-power section is worked, single-chip microcomputer whenever detects 10 zero cross signals and produces the single step of releasing signal of telecommunication, difference according to input voltage, do not wait discharge time between 0.5ms-1.2ms, discharge starts resonant circuit after finishing immediately, stop behind the resonant circuit work 30ms, when treating that first zero cross signal behind the 70ms arrives, produce the operating state that discharge signal repeats one-period once more.Like this, when the 2000W of corresponding high-power section of single-chip microcomputer input PWM value, actual power is 600W, and when the 800W of high-power section of PWM value correspondence, actual power is 240W.
Claims (6)
1, the continuous heating control apparatus of a kind of electromagnetic oven low-power section, it is characterized in that including power circuit (1), CPU (2), discharge circuit (3), control circuit (4), resonant circuit (5), civil power zero cross detection circuit (6) and power tube (IGBT), wherein power circuit (1) is given CPU (2) respectively, discharge circuit (3), control circuit (4), resonant circuit (5), civil power zero cross detection circuit (6) and power tube (IGBT) power supply, the signal output part of civil power zero cross detection circuit (6) is connected with the input of CPU (2), the output of CPU (2) is connected with the input of discharge circuit (3) and control circuit (4) respectively, the output of control circuit (4) is connected with the input of resonant circuit (5), and the output of resonant circuit (5) is connected with power tube (IGBT).
2, the continuous heating control apparatus of electromagnetic oven low-power section according to claim 1 is characterized in that above-mentioned CPU (2) is single-chip microcomputer.
3, the continuous heating control apparatus of electromagnetic oven low-power section according to claim 1 and 2, it is characterized in that above-mentioned civil power zero cross detection circuit (6) includes resistance R 1, R2, RJ1, triode Q1, the wherein grounded emitter of triode Q1, the base stage of triode Q1 is connected with the end of resistance R J1 and an end of resistance R 1 respectively, the other end ground connection of resistance R J1, the other end of resistance R 1 is connected with power circuit (1) by diode D3 and reaches and diode D1, D2 connects, diode D1, the input of D2 is electrically connected with the city, and output is connected with rectifier bridge DB1, and the collector electrode of triode Q1 is connected with power supply by resistance R 2.
4, the continuous heating control apparatus of electromagnetic oven low-power section according to claim 3, it is characterized in that above-mentioned discharge circuit (3) includes resistance R 3, R6, R7, triode Q2, the wherein grounded emitter of triode Q2, the collector electrode of triode Q2 is connected with an end of choke L1 and capacitor C 1 by resistance R 3, the other end ground connection of capacitor C 1 reaching is connected with the output of rectifier bridge DB1, the other end of choke L1 is connected with the output of rectifier bridge DB1, the base stage of triode Q2 respectively with resistance R 6, R7 connects, the other end ground connection of resistance R 6, the other end of resistance R 7 is connected with CPU (2).
5, the continuous heating control apparatus of electromagnetic oven low-power section according to claim 4, it is characterized in that the above-mentioned resonant circuit (5) that includes includes capacitor C 2 and inductance L 2, capacitor C 2 is connected with resistance R 3, choke L1 and capacitor C 1 respectively with an end of the parallel circuits that inductance L 2 is formed, capacitor C 2 is connected with power tube (IGBT) with the other end of the parallel circuits that inductance L 2 is formed, and capacitor C 2 is introduced control circuit (4) by resistance R 4, R5 with the synchronizing signal of resonant circuit (5) respectively with the two ends of the parallel circuits of inductance L 2 compositions.
6, the continuous heating control apparatus of electromagnetic oven low-power section according to claim 5 is characterized in that between the base stage of above-mentioned power tube (IGBT) and the emitter also and is connected to resistance R 8 and voltage stabilizing didoe ZD1.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008202043143U CN201323669Y (en) | 2008-11-28 | 2008-11-28 | Control device of continuous heating during low power period of electromagnetic oven |
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| CNU2008202043143U CN201323669Y (en) | 2008-11-28 | 2008-11-28 | Control device of continuous heating during low power period of electromagnetic oven |
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| CNU2008202043143U Expired - Fee Related CN201323669Y (en) | 2008-11-28 | 2008-11-28 | Control device of continuous heating during low power period of electromagnetic oven |
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