CN1135909C - High-frequency heating cooker - Google Patents
High-frequency heating cooker Download PDFInfo
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- CN1135909C CN1135909C CNB971229651A CN97122965A CN1135909C CN 1135909 C CN1135909 C CN 1135909C CN B971229651 A CNB971229651 A CN B971229651A CN 97122965 A CN97122965 A CN 97122965A CN 1135909 C CN1135909 C CN 1135909C
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Abstract
This invention aims to provide a high-frequency heating cooker. This high-frequency heating cooker includes a microwave oscillator 16 for heating an article. A timer contact 14a is switched on after cooking time is set. A first power supply circuit 20 and a second power supply 25 are used in order to apply the commercial power when the timer contact 14a is plugged to generate a predetermined DC voltage. A control unit 40 has a sensor consisting of a potential setting unit 41, an inverse holding unit 43, and an inverse holding potential setting unit 44 to form a voltage division circuit. It is based on switching on/off operation of the transistors Q5, Q6. Also a switch 50 controls the power supplied to the microwave oscillator 16 depending on the controlled condition of the control unit 40 with a sensor.
Description
Technical field
The present invention relates to regulate the control device of the firepower of high-frequency cooker.
Background technology
So far, automatically control the automatic heating device practicability widely of the firepower of high-frequency cooker.For example, the detection of temperature/gas concentration that the heating chamber that uses thermistor equitemperature transducer and gas sensor, utilizes these detection meanss to carry out is interior is to decide total heating time by begin to measure the time and the multiplication by constants that reach control temperature/controlled concentration from heating.In addition, for example open and disclose in the flat 4-9042 communique simultaneously with temperature sensor and gas sensor control a heating with the corresponding rice of rice amount the spy.
In the above-mentioned high-frequency cooker that has earlier, the major part as control circuit is to use microprocessor, and still, microprocessor is from external tariff height when waiting import, and also can run into the trouble that import is incured loss through delay.These parts in addition, in utilizing the control circuit of microprocessor, also must adopt countermeasure and the microprocessor countermeasure out of control of handling noise, so will cause that cost improves.
In addition, owing to must check the misoperation that has or not microprocessor, so, with do not use microprocessor circuit and compare, development time is long, considers that from the aspect of delivery date and manpower expense the pressure of cost is also arranged, compare with the mechanical high-frequency cooker of unassembled microprocessor, cost an arm and a leg.
Summary of the invention
The present invention is motion in order to address these problems, purpose aims to provide such high-frequency cooker: be not only limited to and do not use the microprocessor that becomes expensive main cause even control the transformer that power supply uses and also do not use, and compare with the mechanical high-frequency cooker that has earlier, improve the versatility and the operability of the cooking significantly.
High frequency heating cooking utensil of the present invention has: the microwave oscillation portion that is used to heat the gratin in the heating chamber, have the normally opened contact that is inserted between industrial power and the above-mentioned microwave oscillation portion and specified the cooking during time just with the timer of this contacting, when above-mentioned contacting, apply thereby the direct voltage of appointment takes place industrial power the 1st power circuit part and the 2nd power circuit part, the control part of belt sensor and control the switch portion of the energising of above-mentioned microwave oscillation portion according to the control of the control part of this belt sensor; The control part of above-mentioned belt sensor keeps potential setting portion to constitute by potential setting portion, counter-rotating maintaining part and counter-rotating; Potential setting portion has when having applied the voltage of above-mentioned the 1st power circuit part to be detected because the heating of above-mentioned microwave oscillation portion and the gas sensor of the gas that takes place from gratin, this gas sensor has according to this gas detecting and internal resistance and heater that resistance value changes, sets current potential according to the value of the internal resistance of this gas sensor; The counter-rotating maintaining part has when the current potential of this potential setting portion surpasses the 1st current potential the 1st switch element connecting, disconnect and with the action interlock of the 1st switch element and keep the 2nd switch element of this state when above-mentioned current potential drops to the 2nd current potential; Counter-rotating keeps potential setting portion to form the 1st bleeder circuit when above-mentioned the 1st switch element disconnects, thereby the voltage of above-mentioned the 1st power circuit part is carried out dividing potential drop set above-mentioned the 1st current potential, when above-mentioned the 2nd switch element is connected, form the 2nd bleeder circuit, set above-mentioned the 2nd current potential thereby the voltage of above-mentioned the 1st power circuit part is carried out dividing potential drop.Above-mentioned switch portion has the 3rd switch element of connecting and applies the voltage of above-mentioned the 2nd power circuit part and apply the relay of industrial power to above-mentioned microwave oscillation portion when the 3rd switch element is connected when above-mentioned the 1st switch element disconnects.
In addition, high frequency heating cooking utensil of the present invention has: the microwave oscillation portion that is used to heat the gratin in the heating chamber, has the normally opened contact that is inserted between industrial power and the above-mentioned microwave oscillation portion, and specified the cooking during time just with the timer of this contacting, when above-mentioned contacting, apply thereby the direct voltage of appointment takes place industrial power the 1st power circuit part and the 2nd power circuit part, the control part of the described belt sensor of claim 1 and switch portion, the current on time control part, make the effective function of control 2 configuration parts of the control part of above-mentioned belt sensor when making control effective function 1 configuration part of above-mentioned current on time control part when pressing function 1 options button and pressing function 2 options buttons; Above-mentioned current on time control part is made of potential setting portion, charging part and counter-rotating maintaining part; Potential setting portion has according to operation and the variable variable resistor of resistance value, and the voltage of above-mentioned the 1st power circuit part is carried out dividing potential drop according to variable-resistance value, charging part has the capacitor that the voltage with above-mentioned the 1st power circuit part discharges and recharges, and the counter-rotating maintaining part has the conducting when surpassing the partial pressure value of being set by above-mentioned potential setting portion of current potential in this charging part, the 4th switch element that ends and keeps the 5th switch element of its state with the action interlock of the 4th switch element when the current potential of charging part drops to above-mentioned partial pressure value; Above-mentioned functions 1 configuration part has: with function 1 options button push interlock and the 1st switch of conducting, when the 1st switch conduction moment output function 2 stop signals function 2 halt circuits, the 6th switch element of conducting with the conducting interlock of above-mentioned the 1st switch, when the 6th switch element conducting, 1LED lighted and keeps the 7th switch element of the illuminating state of the conducting of above-mentioned the 6th switch element and 1LED, when the 7th switch element conducting, make the 3rd switch element conducting of above-mentioned switch portion, thereby stop turn-on action at the 2nd switch element of the counter-rotating maintaining part setting of the control part of above-mentioned belt sensor to make effective the 8th switch element of control of above-mentioned current on time control part simultaneously and conducting during in input function 1 stop signal, thereby remove the 9th switch element of the conducting state of above-mentioned each switch element; Above-mentioned functions 2 configuration parts have: with function 2 options buttons push interlock and the 2nd switch of conducting, function 1 halt circuit of moment output above-mentioned functions 1 stop signal when the 2nd switch conduction, the 10th switch element of conducting with the conducting interlock of above-mentioned the 2nd switch, when the 10th switch element conducting, 2LED lighted and keeps the 11st switch element of the illuminating state of the conducting of above-mentioned the 10th switch element and 2LED, when the 11st switch element conducting, make the 3rd switch element conducting of above-mentioned switch portion, thereby stop turn-on action at the 4th switch element of the counter-rotating maintaining part setting of above-mentioned current on time control part to make effective the 12nd switch element of control and the conducting during in input above-mentioned functions 2 stop signals of the control part of above-mentioned belt sensor simultaneously, thereby remove the 13rd switch element of the conducting state of above-mentioned each switch element.
Thereby above-mentioned the 1st power circuit part comprises the stabilized power supply portion that certain voltage is exported in the output of the fan electromotor that is connected in series with industrial power and rectification circuit and level and smooth this rectification circuit.
In addition, the control of the control part of above-mentioned belt sensor is become when effective, when the 2nd switch element conducting of the counter-rotating maintaining part of the control part of this belt sensor, replace the 2nd bleeder circuit that the counter-rotating by the control part of belt sensor keeps potential setting portion to form in order to form the 3rd bleeder circuit, between above-mentioned counter-rotating maintenance potential setting portion and above-mentioned functions 3 configuration parts, resistance is set.
In addition, also have with the function stop key push interlock and the shutdown switch of conducting, and have the shunt down circuit of the 13rd switch element conducting of the 9th switch element that when this shutdown switch conducting, makes above-mentioned functions 1 configuration part respectively and function 2 configuration parts.
Description of drawings
Fig. 1 is the circuit diagram of the high-frequency cooker of the embodiment of the invention 1.
Fig. 2 is the oblique view of high-frequency cooker.
Fig. 3 is the power circuit diagram of high-frequency cooker of the present invention.
Fig. 4 is the circuit diagram of an example of expression the of the present invention the 1st and the 2nd power circuit part.
Fig. 5 is the correlation diagram of applied voltage 24 times to time change of internal resistance Rs, the reversal voltage Vr of gas sensor in the cooking and relay.
Fig. 6 is the circuit diagram of the high-frequency cooker of the embodiment of the invention 2.
Fig. 7 is the circuit diagram of the high-frequency cooker of the embodiment of the invention 3.
Fig. 8 is the circuit diagram of the high-frequency cooker of the embodiment of the invention 4.
Fig. 9 is the front elevation of operating portion of the present invention.
Embodiment
Fig. 1 is the circuit diagram of the high-frequency cooker of the embodiment of the invention 1, and Fig. 2 is the oblique view of high-frequency cooker.
Among the figure, the 1st, heating chamber, the 2nd, rotating disk, the 3rd, door, the 4th, the container of dress gratin.The 5th, with the operating portion that door 3 is adjacent to be provided with, the timer knob (referring to Fig. 2) that is used to set the cooking time can be installed freely to rotate.The 16th, to the microwave oscillation portion of heating chamber 1 internal radiation microwave, be connected with industrial power with relay contact 51a by timer contact 14a.20 is the 1st power circuits, and 25 is the 2nd power circuits, the 30th, and heating control section is by the control part 40 of the belt sensor with gas sensor 42 with have the switch portion 50 that makes relay contact 51a carry out the relay 51 of on/off and constitute.
Below, the power circuit of high-frequency cooker is described.Fig. 3 is the power circuit diagram of high-frequency cooker of the present invention, and this circuit is common for described other embodiment in back.
Among the figure, the 10th, be used to be taken into the attaching plug of industrial power, the 11st, fuse, the 12nd, the door sensor portion that switch 12a connected when door 3 was closed.The 13rd, the rotary tray motor that rotating disk 2 is rotated, the 14th, timer contact 14a is connected and mechanical timer to carrying out timing with this amount of spin cooking time corresponding, the 15th, to the lamp of heating chamber 1 intraoral illumination.
Below, illustrate the above-mentioned the 1st and the structure of the 2nd power circuit part.Fig. 4 is the circuit diagram of an example of expression the of the present invention the 1st and the 2nd power circuit part, among the figure, the 1st power circuit part 20 is made of bridge rectifier 22 and stabilized power supply portion 23, bridge rectifier 22 is made of fan electromotor 21 and 4 diodes of the cooling usefulness that is connected in series with industrial power, stabilized power supply portion 23 by the adjuster IC of positive pole one side that is inserted into bridge rectifier 22 and be arranged on positive pole one side of bridge rectifier 22 and negative pole one side between, smmothing capacitor C1, C2 that this adjuster IC is clipped in the middle constitute.
The fan electromotor 21 of the 1st power circuit part 20 plays dropping resistor, be added to by the alternating voltage after fan electromotor 22 step-downs on the negative pole of diode D1 of bridge rectifier 22, its impedance setting is that to make the cathode voltage of diode D1 be heating control section 30 needed voltages about more than 1.6 times, less than the rated voltage of adjuster IC.
In addition, the 2nd power circuit part 25 by with the resistance R a of alternating voltage step-down, will carry out the bridge rectifier 26 of full-wave rectification by the alternating voltage after the resistance R a step-down and the smmothing capacitor C3 that smoothing processing generates for example about 24V direct voltage will be carried out in the output of bridge rectifier 26 constituting.
Below, the structure of heating control section is described according to Fig. 1.As previously mentioned, heating control section 30 is made of with the switch portion 50 that has applied the 24V voltage of the 2nd power circuit part 25 control part 40 of the belt sensor of the 5V voltage that has applied the 1st power circuit part 20.
The control part 40 of belt sensor keeps potential setting portion 44 to constitute by potential setting portion 41, counter-rotating maintaining part 43 and counter-rotating, wherein, potential setting portion 41 constitutes by the gas sensor 42 that is provided with highlightedly on heating chamber 1, have the Rh of heater portion that adds 5V voltage and internal resistance Rs with resistance R 10 that this internal resistance Rs is connected in series.
In addition, counter-rotating maintaining part 43 comprises: the transistor Q5 that the internal resistance Rs of emitter and gas sensor 42 and the contact of resistance R 10 are connected, one end and the resistance R 11 that the collector electrode of transistor Q5 is connected, the other end is connected with ground are with the transistor Q6 that tie point be connected, emitter with ground be connected of base stage with transistor Q5 and resistance R 11.This transistor Q5 is equivalent to the 1st switch element of the present invention, and transistor Q6 is equivalent to the 2nd switch element.
In addition, counter-rotating keeps potential setting portion 44 to comprise: an end and the resistance R 13 that positive pole one side of the 1st power circuit part 20 is connected, the other end is connected with the base stage of transistor Q5, the resistance R that contact is connected, the other end is connected with ground 14 of one end and this resistance R 13 and transistor Q5, the capacitor C4 that is connected in parallel with resistance R 14, and be inserted into resistance R 12 and diode D10 between the collector electrode of the contact of resistance R 13, R14 and transistor Q6; When transistor Q5 ends, form the 1st bleeder circuit, during transistor Q6 conducting, form the 2nd bleeder circuit by resistance R 12, R13 and R14 by resistance R 13 and R14.
Above-mentioned switch portion 50 comprises: have transistor Q4 that base stage is connected with the collector electrode of transistor Q6, be inserted into the emitter of transistor Q4 and the diode D9 between the ground and the relay drive division 52 of the resistance R 8 that is provided with between the base stage of transistor Q4 and emitter, when transistor Q4 conducting, apply the relay 51 of 24V voltage of the 2nd power circuit part 25 and diode D6 and the smmothing capacitor C5 that is connected in parallel with relay 51 respectively.The high-tension back electromotive force that this diode D6 takes place when being absorbed in the voltage of sever supply relay 51 is provided with.Above-mentioned transistor Q4 is equivalent to the 3rd switch element of the present invention.
Below, the gas detecting mechanism of above-mentioned gas transducer is described simply.Do not exist in the surrounding atmosphere of gas sensor under the state of oxygen, for example, this transducer is placed following time of high temperature of 40 ℃, free electron will be by tin oxide (SnO
2-x) the grain circle and flowing of particle.In the air of cleaning, oxygen is adsorbed on the surface of tin oxide, because oxygen has electron affinity, so, capture the free electron of tin oxide, form potential barrier at grain circle.Potential barrier hinders flowing of electronics, the result, and resistance increases.The oxidation reaction of these gases and adsorb oxygen just takes place when exposing to the open air on transducer in reducibility gas (for example, steam) on the surface of tin oxide, the result, and the lip-deep oxygen that is adsorbed on tin oxide reduces, and potential barrier reduces, thus electronics moves easily.Utilize such mechanism, gas sensor just can detect the gas concentration that comprises in the atmosphere according to resistance variations.
Particularly, the feature of the gas sensor 42 of Shi Yonging is fast to the answer speed of steam in the present embodiment, but little to the sensitivity of alcohol, and the sensitivity of imflammable gas is almost 0, so the internal resistance Rs of gas sensor 42 almost only changes with steam vapour amount.The incipient stability time after the energising is 3～5 minutes, and is shorter than the transducer that has earlier.
Below, the action of the high-frequency cooker of present embodiment is described.
1) for example, with the container 4 of having put into 1 glass a spot of rice and suitable quantity of water be put into heating chamber 1, with door 3 close, the timer knob 6 setting cookings of rotary manipulation portion 5 are during the time, the switch 12a of door sensor portion 12 connects, thereby timer contact 14a connects, and is respectively rotary tray motor 13, mechanical timer 14, lamp 15 and the 1st and the 2nd power circuit part 20,25 and adds industrial power.At this moment, the 1st power circuit part 20 utilizes fan electromotor 21 with the alternating voltage step-down, and exports the direct voltage of 5V to the control part 40 of the belt sensor of heating control section 30 through the level and smooth back of rectification.Fan electromotor 21 rotates when adding industrial power, with cooling in the heating chamber 1.
When 2) voltage of 5V is added on the control part 40 of belt sensor, the resistance R 10 that electric current flows through the Rh of heater portion of gas sensor 42 and internal resistance Rs and connects with this internal resistance Rs, by the Rh of heater portion with whole gas sensor 42 heating.
When utilizing gas sensor to cook control, in the past, for whenever gas sensor (for example can be replied, even the situation that the cooking just finishes about 30 seconds) switch on for the Rh of heater portion always, keep 1 thermal equilibrium state, but, in the present embodiment, so long as after cooking beginning, detect the cooking of controlling through the steam vapour amount in the moment more than 5 minutes, then just can perception steam when the Rh of heater portion energising begins to cook, only be the cooking time conduction time, so, both economical.
When 3) voltage of 5V is added on the gas sensor 42, under normal temperature (20 ℃, humidity 60%), because setting resistance R 10, R13, R14 make the emitter current potential of transistor Q5 be no more than base potential, so, this transistor Q5 keeps cut-off state, therewith correspondingly, transistor Q6 also keeps the state that ends, and the electric current of the 1st power circuit part 20 flows into the base stage of the transistor Q4 of switch portion 50 by diode D10 and resistance R 12.Therefore, this transistor Q4 conducting, electric current flows through relay 51, and relay contact 51a is connected, and industrial power is added in the microwave oscillation portion 16.At this moment, microwave oscillation portion 16 produces microwave, begins to carry out the heating of the gratin in the container 4.
4) owing to heat, the moisture start vaporizer of the gratin in the container 4 is full of steam in heating chamber 1, and when near the water vapor concentrations the gas sensor 42 raise, the internal resistance Rs of gas sensor 42 reduced, thereby the emitter current potential of transistor Q5 rises.
When 5) this emitter current potential surpasses base potential, transistor Q5 conducting, therewith correspondingly, base current flows through transistor Q6, so, also conducting of transistor Q6.At this moment, because the base potential of transistor Q4 becomes ground state,, cut off the electric current that flows to relay 51, thereby stop energising to microwave oscillation portion 16 so transistor Q4 ends.
6) because the heating of gratin stops, from the steam minimizing of gratin generation, when near gas sensor 42 water vapor concentrations reduce, the internal resistance Rs of gas sensor 42 increases.Here, when transistor Q5, Q6 conducting, the emitter current potential of transistor Q5 is the dividing potential drop of internal resistance Rs and resistance R 10, and base potential is the combined resistance in parallel of resistance R 12, R14 and the dividing potential drop of resistance R 13.
7) therefore, when the emitter current potential of transistor Q5 is lower than base potential, internal resistance Rs increase (water vapor concentration reduction), transistor Q5 ends, and therewith correspondingly, transistor Q6 also ends, transistor Q4 conducting once more.Because the conducting of transistor Q4, electric current flows through relay 51, begins 16 energisings to microwave oscillation portion once more.At this moment, the gratin in the container 4 is heated once more, the result, and water vapor concentration begins to increase.
8) for example, when cooking congee, there is the problem that congee overflows owing to heat from container 4.Thereby controlled heating even want the on/off of utilizing time constant to heat, if the current on time height, congee also will overflow in the process of the cooking, also not overflow in order to make until end of cooking, just set current on time low, and still, the cooking time will prolong.
Therefore, in this circuit, establishing before overflowing is that water vapor concentration in the heating chamber 1 internal resistance Rs when high is Rsb, and the value that then preestablishes R10, R13, R14 is so that Rsb: R10=R13: R14.Therefore, transistor Q5 conducting before overflowing stops heating, prevents to overflow.
At this moment reversal voltage Vr becomes Vr=Vcc * R14/ (R13+R14)=Vcc * R10/ (Rs+R10).Wherein, Vcc is the direct voltage 5V of the 1st power circuit part 20.
If the combined resistance in parallel of resistance R 12, R14 is Rp1, thereby the base potential Vb of the transistor Q5 when then the vibration of transistor Q5, Q6 conducting microwave stops becomes Vb=Vcc * Rp1/ (Rp1+R13).Wherein, Rp1=R12 * R14/ (R12+R14).
In addition, because emitter current potential Ve is Ve=Vcc * R10/ (Rs+R13), so, stopping to the heating of gratin, water vapor concentration reduces, and internal resistance Rs increases gradually, and in the moment of Vb＞Ve, transistor Q5 ends, and transistor Q6 also ends immediately.Because this transistor Q6 ends, base current flows through transistor Q4 once more, thus also conducting of this transistor Q4.As a result, electric current flows through relay 51, so, 16 startings of microwave oscillation portion, the gratin in the container 4 was heated before overflowing once more.
If the internal resistance Rs the when water vapor concentration when transistor Q5 ends, in the heating chamber 1 is low is Rst, then in the scope of Rsb≤Rs≤Rst, microwave oscillation portion 16 alternately vibrates repeatedly and stops.Wherein, Rsb=R10 * R14/R13, Rst=R10 * Rp1/R13.As shown in Figure 5, the internal resistance Rs of gas sensor 42 changes (increase) time to Rst from Rsb, be exactly microwave oscillation portion 16 time of stopping be the time of relay 51 by (voltage 0V), internal resistance Rs changes (reducing) time to Rsb from Rst, and the time that is exactly microwave oscillation portion 16 generation microwaves is the time that relay 51 is connected (voltage 24V).
Because the internal resistance Rs of gas sensor 42 is in the relation of Rst＞Rsb, so, when R13＜R14, resistance R 12 must be set at and satisfy R12＞R13
2* R14/ (R14
2-R13
2) relation.
As mentioned above, owing to the regular transistor of not using microprocessor and IC etc. to utilize in the counter-rotating maintaining part 43 of the control part 40 of belt sensor to obtain easily constitutes, so, the parts that cheapness and delivery date are stable have been realized, in addition, using gases transducer 42 is at the corresponding current on time of steam vapour amount of each varying cyclically and gratin generation, so, can carry out more effective heating, and, keep each resistance R 13 of potential setting portion 44 owing to set the resistance R 10 and the counter-rotating of potential setting portion 41 respectively, heating can not take place in the value of R14, so, have the effect that can not overflow and can shorten the cooking time.
In addition, the output voltage as generating the 1st power circuit part 20 has utilized the impedance of fan electromotor 21, so, do not need transformer, therefore, thereby have the effect that control basal plate lightweight cost reduces.
In addition, as long as mechanical timer 14 is failure to actuate, electric current just can not flow through the Rh of heater portion of gas sensor 42, so, compare with the situation of energising always, reduced the power consumption in the standby, therewith correspondingly, the life-span of gas sensor 42 also prolongs, and therefore, has economy and has improved the effect of the reliability of gas sensor 42.
Embodiment 2
Embodiment 2 is that the current on time control part that can set current on time arbitrarily is connected with the relay drive division of switch portion in parallel with the control part of the belt sensor of embodiment 1, thus energising that can the controlled microwave oscillating portion.
Fig. 6 is the circuit diagram of the high-frequency cooker of the embodiment of the invention 2, and the part for identical or suitable with the embodiment that illustrated with Fig. 1～Fig. 41 is marked with identical symbol, and omits its explanation.
Among the figure, the 60th, the current on time control part is made of charging part 61, counter-rotating maintaining part 62 and potential setting portion 63.Wherein, charging part 61 comprises: the transistor Q1 that emitter is connected with positive pole one side of the 1st power circuit part 20, the resistance R 2 that one end is connected with the base stage of transistor Q1, the other end is connected with the positive pole of the diode D6 of switch portion 50 by diode D7, the resistance R 3 that one end is connected with the collector electrode of transistor Q1, the smmothing capacitor C6 that the other end is connected, negative pole is connected with ground of anodal and this resistance R 3, the resistance R 4 that is connected with the contact of resistance R 3 and smmothing capacitor C6 with an end.
In addition, counter-rotating maintaining part 62 comprises: the transistor Q2 that emitter is connected with the other end of resistance R 4, one end and the resistance R 5 that the collector electrode of transistor Q2 is connected, the other end is connected with ground are connected with the contact of transistor Q2 and resistance R 5 with base stage, collector electrode and the base stage of transistor Q2 is connected, emitter is connected with ground transistor Q3.Transistor Q2 is equivalent to the 4th switch element of the present invention, and transistor Q3 is equivalent to the 5th switch element.
In addition, potential setting portion 63 comprises: the variable resistor VR and the resistance R 6 that are connected in series with the 1st power circuit part 20, one end and the capacitor C7 that the base stage of transistor Q2 is connected, the other end is connected with ground, the diode D8 that be connected with the contact of transistor Q2 and capacitor C7 with negative pole, positive pole is connected with the base stage of the transistor Q4 of relay drive division 52.
The 70th, have with described operating portion 5 in the back in function 1 configuration part of switch SW 1 of the function 1 options button 70a interlock that is provided with, comprise: an end and resistance R 1, the contact of smmothing capacitor C8 and Zener diode ZD connects, the resistance R 15 that the other end is connected with switch SW 1, one end is connected with an end of resistance R 15, the resistance R 16 that the other end is connected with the other end of switch SW 1, the resistance R 21 that one end is connected with the contact of switch SW 1 and resistance R 16, the capacitor C9 that is connected in parallel with resistance R 21, the transistor Q7 that emitter is connected with the end of this capacitor C9, collector electrode is connected with the collector electrode of transistor Q7, emitter is connected with ground, base stage is connected with the contact of resistance R 21 and capacitor C9, the transistor Q8 that while is connected with the base stage of the transistor Q11 of described function 2 configuration parts 71, back, the anodal diode D1 that is connected with the base stage of transistor Q7, collector electrode is connected with the negative pole of diode D1, base stage is connected with the collector electrode of transistor Q7 and transistor Q9 that emitter is connected with ground, the resistance R 18 that is connected in parallel with diode D1 and transistor Q9, one end is connected with an end of resistance R 15, the resistance R 17 that the other end is connected with an end of resistance R 18, the resistance R 19 and the LED1 that are connected in parallel with resistance R 17, emitter and resistance R 1, the contact of smmothing capacitor C8 and Zener diode ZD connects, the transistor Q16 that collector electrode is connected with the base stage of the transistor Q4 of relay drive division 52 by diode D4 and resistance R 7, an end is connected with the base stage of transistor Q16, the resistance R 20 that the other end is connected with the contact of diode D1 and transistor Q9.Above-mentioned transistor Q7 is equivalent to the 6th switch element of the present invention, and transistor Q8 is equivalent to the 9th switch element, and transistor Q9 is equivalent to the 7th switch element, and transistor Q16 is equivalent to the 8th switch element.
The 71st, have function 2 configuration parts with the switch SW 2 of the function 2 options button 71a interlocks that in operating portion 5, are provided with, circuit structure is identical with the circuit structure of above-mentioned functions 1 configuration part 70.Just the collector electrode of transistor Q17 is connected with the base stage of the transistor Q4 of relay drive division 52 by diode D5 and resistance R 7, and the base stage of while with the transistor Q2 of current on time control part 60 is connected.This is in order to stop the heating of being undertaken by the control of current on time control part 60 when the switch SW 2 of function 2 configuration parts 71 is connected.Above-mentioned capacitor C9 and resistance R 21 are equivalent to function 2 halt circuits of the present invention, and the capacitor C10 and the resistance R 28 of function 2 configuration parts 71 are equivalent to function 1 halt circuit.
Shown in Fig. 9 (a), the operating portion 5 of present embodiment except function 1 options button 70a and function 2 options button 71a, also have slide mass resistance 7, with the above-mentioned LED1 of function 1 options button 70a and function 2 options button 71a adjacency, 2 and the timer knob 6 used of cooking time set.Slide mass resistance 7 changes the resistance value of the variable resistor VR that is provided with at current on time control part 60, regulates output (current on time).
Below, its action is described.
1) utilize timer knob 6 to set the cooking times and when pressing function 1 options button 70a, the power supply of the 1st power circuit part 20 (5V) is added to respectively on the control part 40 and current on time control part 60 of belt sensor, simultaneously, the power supply of the 2nd power circuit part 25 (24V) is added on function 1 configuration part 70.At this moment, switch SW 1 is connected the just instantaneous base stage of passing through the transistor Q11 of capacitor C9 inflow transistor Q8 and function 2 configuration parts 71 of electric current owing to pushing of function 1 options button 70a.This is the thermal control of being undertaken by the setting of function 2 configuration parts 71 in order to remove that adds.
Then, because the capacitance of capacitor C9 is little, 0.01 μ F for example is so charging just has been full of immediately.Therefore, above-mentioned electric current makes this transistor Q7 conducting just as emitter current inflow transistor Q7.Therewith correspondingly, LED1 is lighted in transistor Q9 conducting, simultaneously, with the base stage short circuit of the transistor Q6 of the control part 40 of belt sensor, stops the heating of being undertaken by the control of the control part 40 of belt sensor.In addition, the turn-on action interlock of transistor Q16 and transistor Q9 and conducting.
2) conducting is added to power supply 24V on the relay 51 owing to make the collector current biasing of transistor Q16 at this moment, to be arranged on the transistor Q4 in the relay drive division 52 of switch portion 50.When electric current flow through this relay 51, relay contact 51a connected, and industrial power is added in the microwave oscillation portion 16.
3) on the other hand, when current on time control part 60 adds power supply, capacitor C6 charging, transistor Q2 ends owing to base potential (dividing potential drop of variable resistor VR and resistance R 6) is higher than the emitter current potential.Along with the charging of capacitor C6, the emitter current potential raises, when surpassing base potential, and transistor Q2 conducting, therewith correspondingly, also conducting of transistor Q3.Because the collector electrode of transistor Q2 is connected with the base stage of transistor Q3, the base stage of transistor Q2 is connected with the collector electrode of transistor Q3, so, keep conducting state mutually.Because the conducting of transistor Q3, above-mentioned partial pressure value becomes the state of short circuit, so this value becomes (sticking potential during transistor Q3 conducting) about 0.4V.
4) during transistor Q3 conducting, the transistor Q4 of relay drive division 52 is owing to stoping the bias current to base stage to end, the power supply of block system relay 51 linkedly therewith, thus relay contact 51a disconnects.
5) then, the electric charge of capacitor C6 is along the discharge of the path of resistance R 4 → transistor Q2 → transistor Q3, and transistor Q2 ends during less than above-mentioned 0.4V at the emitter current potential, interlock therewith, transistor Q3 also ends, after, carry out above-mentioned a series of action repeatedly by designated period.In this cycle, can utilize variable resistance VR to change and begin to the time of transistor Q2 conducting, promptly connect the back to the time that disconnects from relay contact 51a from the charging of capacitor C6, so, can at random set current on time.
When 6) having selected function 2 options button 71a, the switch SW 2 of function 2 configuration parts 71 is connected.At this moment, as previously mentioned, electric current moment is by the transistor Q8 of capacitor C10 inflow transistor Q11 and function 1 configuration part 70.Then, this action is followed in transistor Q10 conducting, and LED2 is lighted in transistor Q12 conducting, interlock therewith, and transistor Q17 conducting, thus make the transistor Q4 conducting of relay drive division 52.At this moment, because the conducting of transistor Q17, the base stage of the transistor Q2 of current on time control part 60 becomes 5V, so, stop by what current on time control part 60 carried out and add thermal control.At this moment, the transistor Q4 of relay drive division 52 moves according to the control of the control part 40 of belt sensor.This action is identical with the foregoing description 1.
As mentioned above, in embodiment 2, with the control part 40 of belt sensor the current on time control part 60 that can at random set current on time is set in parallel, do not use microprocessor and IC etc. just can select wherein either party, and when having selected a side function, just remove the opposing party's function reliably, so, can improve the versatility of the cooking, simultaneously, compare, have the effect of the operability of increasing substantially with the machine of not interior dress microprocessor.
Embodiment 3
Embodiment 3 is versatilities of the cooking control carried out for the control part that enlarges by belt sensor and can select the different mode of heating of control part with the belt sensor that illustrates in embodiment 2.
Fig. 7 is the circuit diagram of the high-frequency cooker of the embodiment of the invention 3, and the part for identical or suitable with the embodiment 2 that utilizes Fig. 6 to illustrate is marked with identical symbol, and omits its explanation.
Present embodiment is to have added diode D11 that is connected in series and the resistance R 9 that is connected with the collector electrode of the transistor Q5 of the control part 40 of belt sensor by function 3 configuration parts 72 that constitute with above-mentioned functions 2 configuration parts 71 identical circuit structures and base stage with the transistor Q13 of function 3 configuration parts 72.Shown in Fig. 9 (b), move when having selected function 3 options button 72a function 3 configuration parts 72.Because the insertion of resistance R 9, when the transistor Q6 conducting of the control part 40 of belt sensor, form the 3rd bleeder circuit of the present invention by resistance R 9, R12, R13 and R14.
Below, its action is described.
When 1) connecting by pressing function 3 options button 72a and switch SW 3, as previously mentioned, electric current moment flows into each transistor Q8, Q11 of function 1 and function 2 configuration parts 70,71 by capacitor C11.As previously mentioned, this is in order to remove based on the control part 40 of the belt sensor of the setting of function 1 configuration part 70 or function 2 configuration parts 71 or the action of current on time control part 60.
2) transistor Q13, Q15, the Q19 conducting of function 3 configuration parts 72 then.At this moment, LED3 lights, and makes the base stage of the transistor Q2 of current on time control part 60 become 5V, stops the control of being undertaken by current on time control part 60, simultaneously, makes the transistor Q4 conducting of the relay drive division 52 that is provided with in switch portion 50.This transistor Q4 is from being conducting to by promptly causing the action that this transistor Q4 ends to the conducting owing to the transistor Q6 of the control part 40 of belt sensor, and is identical with the foregoing description 1.
3) during the transistor Q6 conducting of the control part 40 of belt sensor, the base potential Vb of transistor Q5 becomes the dividing potential drop of resistance R 13 and the combined resistance in parallel of resistance R 12, R14 and R15.Because this parallel connection combined resistance is
R12 * R14 * R15/ (R14 * R15+R12 * R15+R12 * R14), so establishing this resistance value is Rp2, then
Vb＝Vcc×Rp2/(Rp2+R13)，
In addition, owing to emitter current potential Ve be
Ve＝Vcc×R10/(R10+Rs)，
So when Vb＞Ve, transistor Q5 reverses once more and ends, thereby the transistor Q4 conducting once more of relay drive division 52 is added to industrial power in the microwave oscillation portion 16.
4) promptly, thereby microwave oscillation portion 16 stops when the heating of gratin, the steam vapour amount that takes place from gratin reduces, so the internal resistance Rs of gas sensor 42 begins to increase from Rs=R10 * R13/R14, and, begin heating in the moment that is increased to Rs=R10 * R13/Rp2 to gratin, the internal resistance Rs of gas sensor 42 is reduced to Rs=R10 * R13/R14 once more, until end of cooking, carries out this circulation repeatedly.
Like this, in embodiment 3, between the control part 40 of belt sensor and function 3 configuration parts 72, insert resistance R 9, change is from the time that is disconnected to connection of relay 51, so, compare with above-mentioned other embodiment, have the effect of the versatility of the further expansion cooking.In addition, because this function just changes the value of resistance R 9, so, also have the effect that can add function at an easy rate.
Embodiment 4
Thereby embodiment 4 be with 1 switch just the conducting of release relay immediately stop the situation of cooking.
Fig. 8 is the circuit diagram of the high-frequency cooker of the embodiment of the invention 4, for being marked with identical symbol with the embodiment 3 identical or suitable parts of utilizing Fig. 7 to illustrate, and omits its explanation.
Present embodiment has the shutdown switch SW4 that pushes the interlock conducting with the function stop key 80 that is provided with in operating portion 5.The end of shutdown switch SW4 is connected with power supply one side of the 2nd power circuit part 25 by resistance R 36, and the other end is connected with function 1, function 2 and each transistor Q8, Q11 of function 3 configuration parts 70,71,72, the base stage of Q14.This circuit structure is equivalent to shunt down circuit of the present invention.
When this shutdown switch SW4 connected, electric current flowed into the base stage of each transistor Q8, Q11, Q14.At this moment, for example, during 72 actions of function 3 configuration parts, transistor Q13, Q15 end, and LED3 is extinguished, and simultaneously, transistor Q19 ends, and the transistor Q4 of the relay drive division 52 of switch portion 50 is ended, and stops electric current to flow into relay 51.
In addition, utilize timer knob after the 6 setting cooking times, during selection function stop key 80, do not carry out energising to microwave oscillation portion 16, still, owing to have only the timing function action, so, can the timing when finishing regularly finish sound and use as cooking notice timer.
Like this, when utilizing function notice key will notify switch SW 4 to connect, although do not use microprocessor and IC etc., under with door 3 closing state, can stop cooking function yet, obtain 0% energising, and, at this moment, owing to have only mechanical timer 14 actions, so, have and can obtain so-called cooking timing function.
As mentioned above, according to the present invention, counter-rotating for the control part of belt sensor keeps, and does not use microprocessor and IC etc., constitutes with the switch element of the regular transistor that obtains easily, so, can realize cheapness and delivery date stable parts, in addition, the using gases transducer is to each varying cyclically and the corresponding current on time of steam vapour amount that takes place from gratin, so, can carry out the most effective heating.
In addition, if timer is failure to actuate, the electric current heater portion of inflow gas transducer not then, so, compare with the situation of energising always, the life-span of gas sensor prolongs, and the power consumption in the standby is few, and is both economical, and, because the life-span of gas sensor prolongs, fault reduces, thereby can obtain to improve the effect of reliability.
In addition, according to the present invention, the current on time control part that can set current on time arbitrarily is set in parallel with the control part of belt sensor, do not use microprocessor and IC etc. just can select wherein a certain side, and, when having selected a side function, just remove the opposing party's function reliably, so, compare with foregoing invention, further improved the versatility of the cooking, and, compare with the machine of not interior dress microprocessor, can obtain to increase substantially the effect of operability.
In addition, owing to will be used for fan electromotor that industrial power is reduced as one of parts of the 1st power circuit part, so, do not need transformer, therefore, can obtain the effect that control basal plate lightweight and cost reduce.
In addition, and function 2 configuration parts between resistance is set, so that: when the control of the control part that is made belt sensor by function 2 configuration parts is effective, during the 2nd switch element conducting of the counter-rotating maintaining part of the control part of this belt sensor, form the 2nd bleeder circuit that counter-rotating that the 3rd bleeder circuit is substituted in the control part of belt sensor keeps potential setting portion to form, so, can utilize the mode of heating different to heat with function 2 configuration parts, in addition, because this function only changes the value of resistance, so, can also obtain to add at an easy rate the effect of function.
Owing to have the shunt down circuit of the 13rd switch element conducting of the 9th switch element that makes function 1 configuration part when stopping at switch connection respectively and function 2 configuration parts by the pressing function stop key, so, although do not use microprocessor and IC etc., thereby also can under door closing state, stop cooking function and obtain 0% current on time heater body, and, at this moment, owing to have only the timer action, so, have the effect that can obtain so-called cooking timing function.
Claims (5)
1. high-frequency cooker is characterized in that:
Have: the microwave oscillation portion that is used to heat the gratin in the heating chamber, have the normally opened contact that is inserted between industrial power and the above-mentioned microwave oscillation portion and specified the cooking during time just with the timer of this contacting, when above-mentioned contacting, apply thereby the direct voltage of appointment takes place industrial power the 1st power circuit part and the 2nd power circuit part, the control part of belt sensor and control the switch portion of the energising of above-mentioned microwave oscillation portion according to the control of the control part of this belt sensor;
The control part of above-mentioned belt sensor keeps potential setting portion to constitute by potential setting portion, counter-rotating maintaining part and counter-rotating; Potential setting portion has when having applied the voltage of above-mentioned the 1st power circuit part to be detected because the heating of above-mentioned microwave oscillation portion and the gas sensor of the gas that takes place from gratin, this gas sensor has according to this gas detecting and internal resistance and heater that resistance value changes, sets current potential according to the value of the internal resistance of this gas sensor; The counter-rotating maintaining part has when the current potential of this potential setting portion surpasses the 1st current potential the 1st switch element connecting, disconnect and with the action interlock of the 1st switch element and keep the 2nd switch element of this state when above-mentioned current potential drops to the 2nd current potential; Counter-rotating keeps potential setting portion to form the 1st bleeder circuit when above-mentioned the 1st switch element disconnects, thereby the voltage of above-mentioned the 1st power circuit part is carried out dividing potential drop set above-mentioned the 1st current potential, when above-mentioned the 2nd switch element is connected, form the 2nd bleeder circuit, set above-mentioned the 2nd current potential thereby the voltage of above-mentioned the 1st power circuit part is carried out dividing potential drop;
Above-mentioned switch portion has the 3rd switch element of connecting and applies the voltage of above-mentioned the 2nd power circuit part and apply the relay of industrial power to above-mentioned microwave oscillation portion when the 3rd switch element is connected when above-mentioned the 1st switch element disconnects.
2. by the described high-frequency cooker of claim 1, it is characterized in that:
Have: the current on time control part makes the effective function of control 2 configuration parts of the control part of above-mentioned belt sensor when making control effective function 1 configuration part of above-mentioned current on time control part when pressing function 1 options button and pressing function 2 options buttons;
Above-mentioned current on time control part is made of potential setting portion, charging part and counter-rotating maintaining part; Potential setting portion has according to operation and the variable variable resistor of resistance value, and the voltage of above-mentioned the 1st power circuit part is carried out dividing potential drop according to variable-resistance value, charging part has the capacitor that the voltage with above-mentioned the 1st power circuit part discharges and recharges, and the counter-rotating maintaining part has the conducting when surpassing the partial pressure value of being set by above-mentioned potential setting portion of current potential in this charging part, the 4th switch element that ends and keeps the 5th switch element of its state linkedly with the action of the 4th switch element when the current potential of charging part drops to above-mentioned partial pressure value;
Above-mentioned functions 1 configuration part has: with function 1 options button push interlock and the 1st switch of conducting, when the 1st switch conduction moment output function 2 stop signals function 2 halt circuits, the 6th switch element of conducting with the conducting interlock of above-mentioned the 1st switch, when the 6th switch element conducting, 1LED lighted and keeps the 7th switch element of the illuminating state of the conducting of above-mentioned the 6th switch element and 1LED, when the 7th switch element conducting, make the 3rd switch element conducting of above-mentioned switch portion, thereby stop turn-on action at the 2nd switch element of the counter-rotating maintaining part setting of the control part of above-mentioned belt sensor to make effective the 8th switch element of control of above-mentioned current on time control part simultaneously and conducting during in input function 1 stop signal, thereby remove the 9th switch element of the conducting state of above-mentioned each switch element;
Above-mentioned functions 2 configuration parts have: with function 2 options buttons push interlock and the 2nd switch of conducting, function 1 halt circuit of moment output above-mentioned functions 1 stop signal when the 2nd switch conduction, the 10th switch element of conducting with the conducting interlock of above-mentioned the 2nd switch, when the 10th switch element conducting, 2LED lighted and keeps the 11st switch element of the illuminating state of the conducting of above-mentioned the 10th switch element and 2LED, when the 11st switch element conducting, make the 3rd switch element conducting of above-mentioned switch portion, thereby stop turn-on action at the 4th switch element of the counter-rotating maintaining part setting of above-mentioned current on time control part to make effective the 12nd switch element of control and the conducting during in input above-mentioned functions 2 stop signals of the control part of above-mentioned belt sensor simultaneously, thereby remove the 13rd switch element of the conducting state of above-mentioned each switch element.
3. by claim 1 or 2 described high-frequency cookers, it is characterized in that: thus above-mentioned the 1st power circuit part comprises the fan electromotor that is connected in series with industrial power, rectification circuit and the level and smooth output of this rectification circuit stabilized power supply portion that exports certain voltage.
4. by the described high-frequency cooker of claim 2, it is characterized in that: also have function 3 configuration parts that constitute by the circuit identical with above-mentioned functions 2 configuration parts, keep between potential setting portion and above-mentioned functions 3 configuration parts resistance being set in above-mentioned counter-rotating, so that make in these function 3 configuration parts under the effective situation of control of control part of above-mentioned belt sensor, when the 2nd switch element conducting of the counter-rotating maintaining part of the control part of this belt sensor, form the 3rd bleeder circuit, the 2nd bleeder circuit that keeps potential setting portion to form with the counter-rotating of the control part that is substituted in belt sensor.
5. by claim 2 or 4 described high-frequency cookers, it is characterized in that: also have by the pushing and the shutdown switch of interlock conducting of function stop key, and have the shunt down circuit of the 13rd switch element conducting of the 9th switch element that when this shutdown switch conducting, makes above-mentioned functions 1 configuration part respectively and function 2 configuration parts.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP234504/97 | 1997-08-29 | ||
| JP234504/1997 | 1997-08-29 | ||
| JP23450497A JPH1183023A (en) | 1997-08-29 | 1997-08-29 | High-frequency heating cooker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1211410A CN1211410A (en) | 1999-03-24 |
| CN1135909C true CN1135909C (en) | 2004-01-21 |
Family
ID=16972073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971229651A Expired - Fee Related CN1135909C (en) | 1997-08-29 | 1997-11-27 | High-frequency heating cooker |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH1183023A (en) |
| CN (1) | CN1135909C (en) |
| TW (1) | TW394837B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030013181A (en) | 2001-08-07 | 2003-02-14 | 삼성전자주식회사 | Microwave oven with rice cooking function and controlling method thereof |
| JP2003332039A (en) | 2002-03-04 | 2003-11-21 | Sharp Corp | High frequency heating device |
| JP4256810B2 (en) | 2003-05-28 | 2009-04-22 | オーディオ・ラボ有限会社 | Back electromotive force prevention unit |
| JP2009072061A (en) * | 2003-05-28 | 2009-04-02 | Audio Labo Corp | Unit for preventing counter-electromotive force |
| CN105193244B (en) * | 2014-05-29 | 2017-10-27 | 佛山市顺德区美的电热电器制造有限公司 | Pressure cooking appliance |
| US11013075B2 (en) * | 2018-12-20 | 2021-05-18 | Nxp Usa, Inc. | RF apparatus with arc prevention using non-linear devices |
-
1997
- 1997-08-29 JP JP23450497A patent/JPH1183023A/en active Pending
- 1997-10-09 TW TW86114819A patent/TW394837B/en not_active IP Right Cessation
- 1997-11-27 CN CNB971229651A patent/CN1135909C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1211410A (en) | 1999-03-24 |
| JPH1183023A (en) | 1999-03-26 |
| TW394837B (en) | 2000-06-21 |
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