CN1239768A

CN1239768A - Microwave oven

Info

Publication number: CN1239768A
Application number: CN99109309A
Authority: CN
Inventors: 武井保
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 1998-06-23
Filing date: 1999-06-23
Publication date: 1999-12-29
Anticipated expiration: 2019-06-23
Also published as: KR100395379B1; TW400423B; JP2000012211A; KR20000005638A; CN1191444C

Abstract

The present invention discloses a microwave oven. When a control device calculates the weight of the cook material according to the output signal from the weight sensor, then the cooking time T used for high power is calculated according to the weight. When 'cooking time T <= determined time T0' is detected, the cooking is carried out at high power. When 'cooking time T > determined time T0' is detected, '500W' is used to proceed the cooking after cooking time is corrected. When the cook material is light, the cooking can be accomplished within a short period of time, so the electrical components or the cooling mechanism for the rating temperature of '500W' continuous cooking can be continued using directly to proceed high power cooking.

Description

Micro-wave oven

The present invention relates to a kind of micro-wave oven (food heating generator), this micro-wave oven has the Weight detecting device that detects gratin weight.

In existing micro-wave oven, be to cook with the strong output of 700W to shorten the cooking time.Like this under the composition situation, meetings such as high-tension transformer and magnetron cause the corresponding power loss because of cooking power output different, high-tension transformer and magnetron etc. are generated heat along with cooking power output, therefore to use the high high-tension transformer and the magnetron of temperature rating of the continuous cooking of ability 700W, or the reinforcement cooling body, force high-tension transformer and magnetron etc. is blown cooling air.

But actual cooking content is to 1～2 bowl of rice heating mostly, closes (volume unit) wine to 1～2 and heats, and most of cooking time is below 3 minutes.Therefore, the high-tension transformer of the temperature rating that use consideration 700W cooks continuously and magnetron etc., or strengthen cooling body, aspect actual use, waste a lot.

The present invention is exactly In view of the foregoing and proposes, and its purpose is to provide a kind of micro-wave oven can use electric device and cooling body corresponding to the temperature rating of the continuous cooking of weak output, cooks with strong output.

In order to achieve the above object, the present invention takes following technical scheme.

A kind of micro-wave oven is characterized in that having:

The cooking room that holds gratin;

Magnetron to above-mentioned cooking room internal radiation microwave;

Detect the Weight detecting device of above-mentioned gratin weight;

Select the strong and weak output selection device of above-mentioned magnetron output according to the testing result of above-mentioned Weight detecting device.

The micro-wave oven of being put down in writing is characterized in that:

Has the temperature-detecting device that detects the electric device temperature;

Output selection device is selected the output of magnetron according to the testing result of Weight detecting device and the testing result of temperature-detecting device.

The micro-wave oven of being put down in writing is characterized in that:

When the testing result of temperature-detecting device during greater than setting, output selection device is selected weak magnetron output.

The micro-wave oven of being put down in writing is characterized in that:

Measuring device with the instrumentation duration of runs and dwell time;

Output selection device is selected the output of magnetron according to the instrumentation result of measuring device and the testing result of Weight detecting device.

The micro-wave oven of being put down in writing is characterized in that:

When the difference that detects the duration of runs and dwell time was bigger than setting, output selection device was selected weak magnetron output.

The micro-wave oven of being put down in writing is characterized in that:

When detecting the operation of button in gastronomical process, output selection device is considered the content of operation of button simultaneously when considering the testing result of Weight detecting device, select the output of magnetron.

The micro-wave oven of being put down in writing is characterized in that:

Has the cooking program options button of selecting cooking program;

After the handling time of cooking program key finished, output selection device was selected the output of magnetron according to the testing result of Weight detecting device.

The micro-wave oven of being put down in writing is characterized in that:

Has the fine finishining adjusting key of regulating the gratin completion status;

Behind the handling time of fine finishining adjusting key, output selection device is selected the output of magnetron according to the testing result of Weight detecting device.

The micro-wave oven of being put down in writing is characterized in that:

Output selection device shows the selection result of output on display unit.

Micro-wave oven of the present invention is characterized in that having: the cooking room that holds gratin; Magnetron to above-mentioned cooking room internal radiation microwave; Detect the Weight detecting device of above-mentioned gratin weight; Select the strong and weak output selection device of above-mentioned magnetron output according to the testing result of above-mentioned Weight detecting device.

According to said apparatus, when gratin is very light, can select strong output.At this moment because finish the cooking at short notice, therefore can use electric device and cooling body corresponding to the temperature rating of the continuous cooking of weak output.

Micro-wave oven of the present invention is characterized in that: have the temperature-detecting device that detects the electric device temperature, output selection device is selected the output of magnetron according to the testing result of Weight detecting device and the testing result of temperature-detecting device.

According to said apparatus, for example directly begin the cooking again from the cooking last time, under the very high situation of the temperature of electric device, also can select strong output when the weight of gratin is lighter.At this moment, owing to can in the shorter time, finish the cooking, so can prevent the temperature overrate of electric device.

Micro-wave oven of the present invention is characterized in that: when the testing result that detects temperature-detecting device during greater than setting, output selection device is selected weak magnetron output.

According to said apparatus, than setting height, in the time of can not selecting to export by force,,, the selection of output become simply so handling owing to not considering that gratin weight selects weak output in the temperature of electric device.

Micro-wave oven of the present invention is characterized in that: the measuring device with the instrumentation duration of runs and dwell time.Output selection device is selected the output of magnetron according to the instrumentation result of measuring device and the testing result of Weight detecting device.

According to said apparatus, can calculate the temperature of electric device according to the duration of runs and dwell time, foundation is calculated temperature selection output, so do not need the temperature-detecting device of actual measurement electric device temperature, makes and forms simply.

Micro-wave oven of the present invention is characterized in that: when the difference that detects the duration of runs and dwell time was bigger than setting, output selection device was selected weak magnetron output.

According to said apparatus, in the running between and the difference of dwell time very big, the temperature of electric device is than under the high situation of setting, owing to the weight of not considering gratin is selected weak output, so can make the selection processing of output become simple.

Micro-wave oven of the present invention is characterized in that: when detecting the operation of button in gastronomical process, output selection device adds the content of operation of button in the testing result of Weight detecting device, selects the output of magnetron.

According to said apparatus, in gastronomical process, during operation push-button, when considering the weight of gratin, consider the content of operation of button simultaneously, select the output of magnetron.Like this, even also can be in gastronomical process by operation push-button change cooking content, so improved ease of use.

Micro-wave oven of the present invention is characterized in that: have the cooking program key of selecting cooking program, after the handling time of cooking program key finished, output selection device was selected the output of magnetron according to the testing result of Weight detecting device.

According to said apparatus, owing to after cooking program is determined, can select the output of magnetron according to the weight of gratin, so can correctly select to be suitable for the output of cooking program.

Micro-wave oven of the present invention is characterized in that: have the fine finishining adjusting key of regulating the gratin completion status; Behind the handling time of fine finishining adjusting key, output selection device is selected the output of magnetron according to the testing result of Weight detecting device.

According to said apparatus, after determining the completion status of wishing, can select the output of magnetron according to the weight of gratin.Like this, owing to can correctly select to be suitable for the output of completion status, so gratin can be easy to finish by hope.

Micro-wave oven of the present invention is characterized in that: output selection device shows the selection result of output on display unit.

According to said apparatus, when considering the weight of gratin, consider that simultaneously the temperature of electric device waits under the situation of selecting to export, to set the different cooking time sometimes with a kind of gratin, but owing to the reason of cooking asynchronism(-nization) being notified to the user, so can prevent that from there is distrust in the user.

Can find out clearly that from above-mentioned explanation micro-wave oven of the present invention has following effect:

According to device of the present invention, set the output of magnetron according to the weight of gratin.Like this,, just can finish the cooking in the short time, so can use the electric device and the cooling body of the temperature rating of cooking continuously corresponding to weak output owing to when gratin is light, select strong output.

According to device of the present invention, selected the output of magnetron according to the temperature of the weight of gratin and electric device.Like this, because can be under the situation of electric device preheating, when the weight of gratin is lighter, select strong output, finish the cooking with the shorter time, so can prevent the temperature overrate of electric device.

According to device of the present invention, when the temperature of electric device is bigger than setting, select weak output.Like this, saved the trouble of when considering the temperature of electric device, considering the weight of gratin simultaneously, become simply so the selection of output is handled.

According to device of the present invention, according to the duration of runs of the weight of gratin and device, the output that dwell time is selected magnetron.Like this, under the situation of electric device preheating,, in the shorter time, finish the cooking, therefore can prevent the temperature overrate of electric device owing to select strong output when can be in the weight of gratin lighter.And, become simply so form owing to do not need the temperature-detecting device of actual measurement electric device temperature.

According to device of the present invention, in the running between and the difference of dwell time when bigger than setting, select weak output.Owing to need not when considering the temperature of electric device, consider the weight of gratin simultaneously,, the selection of output become simply like this so handling.

According to device of the present invention, in gastronomical process, during operation push-button, when considering the weight of gratin, consider the content of operation of button simultaneously, select magnetron.Like this, owing to also variable cooking content in gastronomical process, so improved the convenience of using.

According to device of the present invention, after the handling time of cooking program key finishes, select the output of magnetron according to the weight of gratin.Like this, owing to can correctly select to be suitable for the output of cooking program, so improved the completion status of gratin.

According to device of the present invention, after the handling time of fine finishining adjusting key finishes, selected the output of magnetron according to the weight of gratin.Like this, owing to can correctly select to be suitable for the output of desirable completion status, so gratin can be finished by hope.

According to device of the present invention, shown the selection result of output.Like this, under the situation of heating, even cooking asynchronism(-nization) also can be notified to the user with the reason of cooking asynchronism(-nization), so can prevent that from there is distrust in the user with a kind of gratin.

Below with reference to the accompanying drawings, the embodiment of the invention is elaborated.

Fig. 1 is the schematic diagram (flow chart of expression control device control content) of the 1st embodiment of the present invention.

Fig. 2 is the schematic diagram of electric formation.

Fig. 3 is the schematic diagram of guidance panel.

Fig. 4 is a schematic appearance.

Fig. 5 is the schematic diagram (flow chart of expression control device control content) of the 2nd embodiment of the present invention.

Fig. 6 is the schematic diagram of the memory contents of control device.

Fig. 7 is the schematic diagram of the 3rd embodiment of the present invention.

Fig. 8 is the schematic diagram (flow chart of expression control device control content) of the 4th embodiment of the present invention.

Fig. 9 is the schematic diagram (electric formation schematic diagram) of the 5th embodiment of the present invention.

Below with reference to Fig. 1 to Fig. 4 the 1st embodiment of the present invention is described.

In Fig. 4, cabinet 1 is the box-like body of front openings, forms cooking room 2 in the inside of cabinet 1.Rotary fire door 3 is installed in the left side of cabinet 1, and the front openings part of cooking room 2 opens and closes by the rotary manipulation of fire door 3.

In cabinet 1, the right side that is positioned at cooking room 2 forms the Machine Room (not shown).Inside in this Machine Room is equipped with magnetron 4 as shown in Figure 2, the plus earth of this magnetron 4.In addition, in the inside of Machine Room high-tension transformer 5 is installed.This high-tension transformer 5 has primary coil 5a, secondary coil 5b, secondary coil 5c.The two ends of secondary coil 5b are connected to the two ends of magnetron 4 negative electrodes.Simultaneously, the double heater of doing of the cathode of magnetron 4 uses.

The end of secondary coil 5b is connected the anode tap of high-voltage diode 6a.The anode tap that connects high-voltage diode 6b on the cathode terminal of this high-voltage diode 6a, the cathode terminal ground connection of high-voltage diode 6b.In addition, the end of secondary coil 5c is connected on the cathode terminal of high-voltage diode 6b, and the other end of secondary coil 5c is connected on the common tie point of high-voltage diode 6a and 6b by high-voltage capacitor 7.Parallel resistance 8 between the two ends of high-voltage capacitor 7.

The two ends of primary coil 5a connect and connect smmothing capacitor 10 between 9, two power lines 9 of power line, connect oscillating capacitor 11 between the two ends of primary coil 5a.In addition, two power lines 9 are connected on two outputs of rectification circuit 12.This rectification circuit 12 is connected on two power line 13a in AC mains source 13 of 100V, is added with series reactor (ヘぃかつリア Network ト Le) 14 on the power line 9 of primary coil 5a.

Connect IGBT15 on another power line 9 of primary coil 5a.This IGBT15 is the device with inertia diode 15a, and smmothing capacitor 11 discharges make primary coil 5a and IGBT15 have forward current Ia to flow through during the IGBT15 conducting.And when IGBT15 ends, on primary coil 5a, flow through forward lagging current Ia, make oscillating capacitor 11 chargings.When the lagging current Ia of forward disappeared, reversing the current Ib. was flow through in oscillating capacitor 11 discharges on primary coil 5a

In the internal configurations of Machine Room by with the microcomputer being the control device 16 that main body is formed.This control device 16 includes CPU16a, ROM16b, RAM16c, input interface 16d, output interface 16e.Output interface 16e goes up by drive circuit 17 and is connected with the grid of IGBT15.Control device 16 is equivalent to output selection device, measuring device.

As shown in Figure 3, in the front of cabinet 1 guidance panel 18 is installed.Guidance panel 18 install can pressing operation add hot key 19, hot wine key 20, fixed point add hot key 21, fine finishining adjusting key 22, fine finishining adjusting key 23, cancel key 24 etc.

As shown in Figure 2, the back of 19～24 each button is installed with switch 18a on guidance panel 18.When operation 19～24 each button, the switch 18a of corresponding back connects.These switches 18a is connected on the input interface 16d of control device 16, and control device 16 goes out the mode of operation of 19～24 each button according to the state-detection of switch 18a.Wherein add hot key 19, hot wine key 20 is equivalent to the cooking program key.

Control device 16 is when detecting the operation that adds hot key 19 or hot wine key 20, and the grid by 17 couples of IGBT15 of drive circuit adds the driving signal, drives control IGBT15.Like this, driving power is added on the primary coil 5a of high-tension transformer 5, the secondary coil 5b of high-tension transformer 5 and 5C be by excitation, so high voltage is added to magnetron 4, from 4 pairs of cooking rooms of magnetron, 2 internal radiation microwaves.

As shown in Figure 2, between two power line 13a in AC mains source 13, normal opened contact 25a by motor relay 25 connects the RT motor 26 that drives rotating disk 28, and the coil 25b of motor relay 25 is connected on the output interface 16e of control device 16 by drive circuit 27.This RT motor 26 is installed in the bottom in the cabinet 1, and control device 16 is added to power supply on the coil 25b by drive circuit 27 when detecting the operation that adds hot key 19 or hot wine key 20.This is transformed into closure state to normal opened contact 25a, from AC mains source 13 power supply is added to RT motor 26.

As shown in Figure 4, the bottom in the cooking room 2 is equipped with and can moves up and down and rotatable rotating disk 28.The rotating shaft 28a of this rotating disk 28 is connected in the rotating shaft of RT motor 26 by the gear mechanism (not shown).When power supply is added on the RT motor 26 26 actions of RT motor, rotating disk 28 rotations.

In cabinet 1 cooking room 2 below, erection weight sensor 29.This weight sensor 29 is the electrostatic capacitive devices with movable electrode and fixed electrode (all not showing among the figure).When placing gratin 28b on the rotating disk 28, rotating disk 28 is owing to the weight of gratin 28b descends, and the rotating shaft 28a of rotating disk 28 oppresses movable electrode.At this moment, because movable utmost point change in location, the distance between movable electrode and fixed electrode changes, so the electrostatic capacitance of weight sensor 29 changes.Weight sensor 29 is equivalent to Weight detecting device.

As shown in Figure 2, weight sensor 29 is connected on the input interface 16d of control device 16 by output circuit 30.The weight signal of the corresponding frequency of electrostatic capacitance of these output circuit 30 outputs and weight sensor 29.Control device 16 to handling from the weight signal of output circuit 30 outputs, carries out computing to the weight W of gratin 28b according to the operational formula of being stored simultaneously in ROM16b.

Among the ROM16b of control device 16, the value of cooking constant " a ", " 1b " is stored respectively by each heating schedule.When control device 16 detects the operation that adds hot key 19 or hot wine key 20, read cooking constant " a " corresponding to " heating schedule ", " b " or corresponding to cooking constant " a ", " b " of " hot wine program ", below the substitution in (1) formula.

T＝a×W＋b ……(1)

(1) formula is the operational formula that is stored in the cooking time T among the ROM16b of control device 16 in advance.Control device 16 will be cooked constant " a ", " b " substitution (1) formula, and with operation result W substitution (1) formula of weight, computing is corresponding to the cooking time T of cooking program.

As shown in Figure 3, the liquid crystal indicator 31 that is equivalent to display unit is installed on the guidance panel 18.As shown in Figure 2, this display unit 31 is connected to by drive circuit 32 on the output interface 16e of control device 16, and control device 16 shows various cooking informations on liquid crystal indicator 31.

The temperature sensor 33 that is equivalent to temperature-detecting device is installed in the inside of Machine Room.This temperature sensor 33 is made up of thermistor, and output is corresponding to the temperature signal of the voltage level of magnetron 4 temperature.Control device 16 detects the temperature t m of magnetron 4 according to the output signal of temperature sensor 33.

On the input interface 16d of control device 16, connect microswitch 34.This microswitch 34 is connected when rotating disk 28 reaches the regulation anglec of rotation.Connect the timing that begins through the stipulated time from microswitch 34, the normal opened contact 25a of motor relay 25 is transformed into open mode from closed condition, and this timed unit 16 stops operating rotating disk 28 in the angle of setting.

As shown in Figure 2, between two power line 13a in AC mains source 13, by the normal opened contact 35a connection fan motor 36 of cooling fan relay 35.The coil 35b of cooling fan relay 35 is connected to by drive circuit 37 on the output interface 16e of control device 16.This fan motor 36 is installed in the inside of Machine Room.When control device 16 drove magnetron 4,37 couples of coil 35b added power supply by drive circuit, make normal opened contact 35a be transformed into closed condition, from AC mains source 13 power supply are added on the fan motor 36.

On the rotating shaft of fan motor 36, connect the cooling fan (not shown).This cooling fan is installed in the inside of Machine Room.When adding power supply on the fan motor 36, the cooling fan rotation is blown cooling air to electric devices such as magnetron 4 and high-tension transformers 5.

Effect to above-mentioned composition describes below.Following action is that control device 16 is carried out according to the control program that is stored in advance among the ROM16b.Then is when adding the operation of hot key 19 or hot wine key 20 when control device 16 detects fixed point after adding the operation of hot key 21, set " fixed point heating schedule ", make rotating disk 28 remain on the state that set angle stops when gratin 28b being heated with following " 700W ".Then, be judged as " YES ", forward step S2 to, according to the weight signal of weight sensor 29 outputs, the weight W of computing gratin at the step S1 of Fig. 1.

After the weight W of control device 16 computing gratin 28b, forward step S3 to, by above-mentioned steps computing cooking time T.The setting of this cooking time T can obtain best completion status in strong output " 700W ".After the cooking time T that control device computing 700W uses, forward step S4 to, read from ROM16b and judge time T o.This judgement time T o is representing when cooking that with " 700W " temperature of magnetron 4, high-tension transformer 5, IGBT15 etc. is no more than the time of rated value.When control device 16 read judge time T o after, compare in the cooking time T of step S2 and setting.

When control device forwards step S5 to after step S4 detects " T≤To ", on display unit 31, be presented at the cooking time T and the cooking power output " 700W " of step S3 computing.Then, forward step S6 to, the duty factor of using by the 700W that stores among the ROM16b drives control IGBT15, with strong output " 700W " gratin 28b is heated.Meanwhile, the coil 35b of cooling fan relay 35 is added power supply, fan motor 36 is blown a cold wind over to magnetic control 4 and high-tension transformer 5 etc.

When not operation fixed point added hot key 21 before adding hot key 19 or 20 operations of hot wine key, control device 16 made the normal opened contact 25a of motor relay 26 keep closed condition, and rotating disk 28 is rotated continuously.Meanwhile output is set at " 500W ", gratin 28b is heated.

When control device when step S4 detects " T＞To ", forward step S7 to, carry out " 7T/5 → cooking time T ", will cook time T and be revised as weak output " 500W ".Then, forward step S8 to, on display unit 31, show cooking time T and cooking power output " 500W " usefulness revised by step S7, forward step S9 then to.

When control device 16 forwarded S9 to, the duty factor of using by the 500W that stores among the ROM16b drove control IGBT15, with weak output " 500W " cooking thing 28b.Meanwhile, power supply is added on the coil 35b of cooling fan relay 35, fan motor 36 is blown cooling air to magnetron 4 and high-tension transformer 5 etc.At this moment, owing to detect the setting of " fixed point heating schedule ", therefore reach " T/2 " before in the cooking time, the state that rotating disk is stopped with the set angle maintenance is reaching cooking time " T/2 " running continuously afterwards.

After control device 16 is carried out the cooking with " 700W " or " 500W ", forward step S10 to.At this, passed through setting-up time T if detect, then forward step S11 to, make IGBT15 and fan motor 36 keep closed condition.Meanwhile, when rotating disk 28 rotations, the power supply that cuts off the coil 25b of motor relay 25 stops RT motor 26, finishes the cooking.

When control device 16 began to cook on step S6 or step S9, the cooking time showing value process in time of display unit 31 was successively decreased, and display unit 31 shows the residue cooking time.In addition, when after step S6 or step S9 begin cooking, detecting the operation of cancel key 24, when keeping the IGBT15 closed condition, rotating disk 28 and cooling fan are stopped, the cancellation cooking.

The power that is used for microwave oscillation is about 50～55% of power.Therefore need the power of 910W～1000W for the weak output that obtains 500W, the power of about 250W such as loss such as magnetron 4 grades, the power of about 150W such as loss such as high-tension transformer 5 grades.Thereby, the about 1.4 times power in the time of will needing 500W for the strong output that obtains 700W, the power loss amount of magnetron 4 grades is about 350W, and the power loss amount of high-tension transformer 5 grades is about 210W, and the caloric value of magnetic control 4 and high-tension transformer 5 etc. is very high.

To this, in the foregoing description, when gratin 28b is very light, selected strong output " 700W ".At this moment, because therefore the cooking that just is through with at short notice adopts electric device and cooling body corresponding to the temperature rating of the continuous cooking of weak output " 500W ", under strong output " 700W ", also can fault-free cook.And when gratin 28b is very heavy, selected weak output " 500W ".At this moment, though the cooking time spent is long, implements the cooking and can not produce harmful effect magnetron 4 and high-tension transformer 5 etc.

Below with reference to Fig. 5 and Fig. 6 the 2nd example of the present invention is described.As shown in Figure 6, in the ROM16b of control device 16, the relation of storage magnetron 4 temperature t m and judgement time T o.When these storage data are cooked, represent all that at the temperature t m of each magnetron 4 temperature of magnetron 4 and high-tension transformer 5 etc. is no more than the judgement time T o of rated value under strong output " 700W ".After the control device 16 computings cooking time T, forward the step S20 of Fig. 5 to, detect the temperature t m. of magnetron 4 according to the output signal of temperature sensor 33.

When control device 16 detects the temperature t m of magnetron 4, forward step S21 to, set in the scope of " To "～" Tmax " according to detected temperatures tm and judge time T, forward step S4 to.At this, the cooking time T of step S3 setting and the judgement time T o of step S21 setting are compared, export the cooking of " 700W " or weak output " 500W " by force according to comparative result.

According to the foregoing description, last time restarting the cooking immediately after the cooking, owing to when the temperature t m of magnetron 4 is high, judge that time T o shortens (comprising the judgement time 0), so the weight of gratin 28b is selected strong output " 700W " when lighter.At this moment because of finishing the cooking, so can prevent the temperature overrate of electric device with the shorter time.

In addition, actual measurement the temperature t m of magnetic control 4.Like this, no matter because environment etc. is set how can both correctly detects the temperature t m of magnetron 4 of cabinet 1 exported " 700W " by force so can prevent wrong choice, the temperature of electric device is crossed rated value.

Numeral has shown output " 500W " or " 700W " on display unit 31.For this reason, to same gratin 28b heating the time, even it is short to be set at cooking time last time, the time of the cooking specifically is long, also the reason of cooking asynchronism(-nization) can be announced to the user, so can be prevented that the user from producing and do not believe sense.

In the 2nd above-mentioned embodiment, selected the output of magnetron 4 according to the temperature t m of the weight W of gratin 28b and magnetic control 4, but also be not limited only to this, for example when the temperature t m of magnetron 4 is also bigger than the maximum tmax of Fig. 6, to cook time T and be revised as after " 500W " usefulness, also can on " 500W ", cook.When constituting like this, do not consider the weight W of gratin 28b and select weak output " 500W ", so that the selection of output is handled is just simple.

In addition, in above-mentioned the 2nd embodiment, detected the temperature t m of magnetron 4 by temperature sensor 33.But also be not limited only to this, for example also can detect primary coil 5a, the secondary coil 5b of high-tension transformer 5, the temperature of secondary coil 5c, IGBT15 etc.Temperature sensor 33 also can be installed in the relevant position of each device temperature.

Below with reference to Fig. 5 and Fig. 7 the 3rd embodiment is described.Control device 16 has up-down counter.This up-down counter is equivalent to measuring device.As shown in Figure 7, control device 16 is when carrying out the cooking running, and every process certain time interval T a just makes up-down counter N add 1.And when stopping not carrying out cooking, whenever through certain time interval T b (＞just make up-down counter N subtract 1 Ta) time.

In the ROM16b of control device 16, store the relation of the temperature t m of the value N of up-down counter and magnetron 4.When on the step S3 of control device 16 at Fig. 5 the cooking after time T carries out computing, being forwarded to step S20, read the value N of up-down counter.Then, the value N to up-down counter handles according to the storage data of ROM16b, forwards step 21 to after calculating the temperature t m of magnetron 4.At this, set when the reckoning temperature t m of magnetron 4 being handled and judge after the time T o according to the storage data of Fig. 6, according to setting-up time T with judge the comparative result of time T o, selecting output " 700W " still is " 500W ".

According to the foregoing description, by the temperature t m that the duration of runs and the dwell time of device are calculated magnetron 4, m has selected output according to the reckoning temperature t.So just no longer need to have measured the temperature sensor 33 of magnetron 4 temperature t m, make to constitute simply.

In above-mentioned the 3rd embodiment, selected the output of magnetron 4 according to the value N of the weight W of gratin 28b and up-down counter, but also be not limited thereto, for example when up-down counter N is bigger than maximum Nmax (=calculate when temperature t m is bigger than the maximum tmax of Fig. 6, when the difference of the dwell time and the duration of runs is bigger than setting), also can will cook time T change into " 500W " with after, go up to carry out the cooking at " 500W ".When constituting like this, owing to do not consider the weight W of gratin 28b, therefore the selection of output is handled and has been become simply.

In addition, in above-mentioned the 3rd embodiment, with the up-down counter instrumentation duration of runs and dwell time.But also be not limited only to this, for example can use in the running whenever just adding 1 the counter duration of runs through certain time interval T a, with when stopping whenever just adding 1 time count halted device through certain time interval T b, calculate the temperature t m. of magnetron 4 according to the difference of two Counter Values.

Below with reference to Fig. 8 the 4th embodiment of the present invention is described.When control device 16 is detecting fixed point when then detecting the operation that adds hot key 19 after adding hot key 21 on the step S30, be judged as " YES " and forward step S31 to, after setting " hot meal program ", forward step S32 to.And when on step S30, being judged as " NO ", forward step S33 to.At this, detect the operation of hot wine key 20, then forward to and set " hot wine program " behind the step S34, forward step S32 to.

When control device 16 forwarded step S32 to, the duty factor driving control IGBT15 by " 500W " usefulness began to forward step S35 to after the cooking with weak output " 500W ".At this, the latency counter that starting is inner, beginning instrumentation stand-by period tw forwards step S36 to.

When forwarding step S36 to, control device 16 forwards step S37 to according to the weight W of the weight signal computing gratin 28b of weight sensor 29 outputs.After the output signal of exporting according to temperature sensor 33 detects the temperature t m of magnetron 4 then, forward step S38 to.At this, when detecting the setting of " hot meal program ", forward step S39 to, judge " stand-by period tw＞5 second ".

When control device 16 detects " stand-by period tw≤5 second " at step S39, forward step S40 to, judge the operation that adds hot key 19.At this,, turn back to step S39, repeating step S39 and S40 when detecting when adding hot key 19 and not operating.And, when during repeating step S39 and S40, detecting " stand-by period tw＞5 second ", forward step S41 to from step S39, after reading cooking constant " a " and " b " corresponding to " hot meal program ", weight W according to cooking constant " a ", " b " and gratin, the cooking time T of computing " 700W " usefulness forwards step S42 to.

When control device 16 detected the operation that adds hot key 19 during repeating step S39 and S40, S40 forwarded S43 to from step, made " hot meal program " become " Hot dishes program ".Then, forward step S41 to, read cooking constant " a " and " b ", after the cooking time T according to weight W computing " 700W " usefulness of cooking constant " a ", " b " and gratin, forward step S42 to corresponding to " Hot dishes program ".

When control device 16 detects the setting of " hot wine program " at step S38, forward step S44 to, read cooking constant " a " and " b " corresponding to " hot wine program ", cooking time T according to weight W computing " 700W " usefulness of cooking constant " a ", " b " and gratin, forward step S45 then to, judge " stand-by period tw＞5 second ".

When control device 16 detects " stand-by period tw≤5 second " at step S45, forward step S46 to.When detecting the operation of fine finishining adjusting key 22 and 23, forward step S47 to, increase and decrease the cooking time T of " 700W " usefulness according to the content of operation of fine finishining adjusting key 22 and 23.Return step S45, when detecting " stand-by period tw＞5 second ", forward step S42 to thereafter.

When forwarding step S42 to, control device 16 is set judgement time T o according to the temperature t m of magnetron 4.Then, forward the step S4 of Fig. 1 to, the corresponding comparative result of judging time T o and cooking time T will be cooked power output and be set to " 700W " or " 500W ".

When detecting the operation of fine finishining adjusting key 22 on the step S46 of control device 16 at Fig. 8, the operation of each key 22 all adds certain value on the cooking time T of " 700W " usefulness.In addition, when detecting the operation of fine finishining adjusting key 23, the operation of each key 23 all deducts certain value from the cooking time T of " 700W " usefulness.

According to the foregoing description, when button 19,22,23 is operated, when considering the weight W of gratin 28b, consider the content of operation of button 19,22,23 simultaneously in gastronomical process, select the output of magnetron 4.Therefore, even in gastronomical process, also can change cooking content, improved ease of use.

In addition, after the handling time that adds hot key 19 finishes, selected the output of magnetron 4 according to the weight W of gratin 28b.Like this, owing to after " hot meal program " or " Hot dishes program " determined, select the output of magnetron 4,, improve the completion status of gratin 28b so correctly select to be fit to the output of " hot meal program " or " Hot dishes program " according to the weight W of gratin 28b.

In addition, fine finishining adjusting key 22 and 23 handling time have been selected the output of magnetron 4 after finishing according to the weight W of gratin 28b.Like this, because after the completion status of hope is determined, select the output of magnetron 4 according to the weight W of gratin 28b, so the correct output of selecting to be fit to completion status makes gratin 28b finish by hope.

In addition, because the output in the time of will cooking beginning is set at " 500W ", because in the handling time process of button 19,22,23, output is remained on " 500W ", so at the detected temperatures tm of magnetron 4 height, (cooking time T of strong output " 700W " be in the handling time 5 seconds time) also can cook when gratin 28b was heavy.And different when after the handling time of button 19,22,23 finishes, beginning to heat again, can suppress waste of time.

In above-mentioned the 4th embodiment, after the handling time of button 19,22,23 finishes, selected the output of magnetron 4 according to the weight W of gratin 28b, but also be not limited only to this, for example also the handling time that adds hot key 19 can be set at 5 seconds after the cooking begins, and the handling time of fine finishining adjusting key 22 and 23 is set at 10 seconds of cooking after beginning.

Under such formation situation, when adding the handling time end of hot key 19, select the output of magnetron 4 according to the first step of the weight W of content of operation that adds hot key 19 and gratin 28b, and when the handling time end of fine finishining adjusting key 22 and 23, select the output of magnetron 4 to get final product once more according to the content of operation of fine finishining adjusting key 22 and 23 and the weight W of gratin 28b.

In addition, in above-mentioned the 4th embodiment, the handling time of button 19,22,23 is set 5 fixing seconds, but also be not limited only to this, for example also can be set at the cooking time " T/5 ".

In above-mentioned the 4th embodiment, the output of the magnetron 4 during with cooking beginning is set in " 500W ", but also is not limited only to this, for example also can be set at strong output " 700W ".

In addition in above-mentioned the 1st to the 4th embodiment, the output of magnetron 4 is divided into " 500W " and " 700W " two class conversions, but also be not limited only to this, for example also can be divided into " 500W ", " 700W ", " 800W " three class conversions, perhaps be divided into " 300W ", " 500W ", " 700W ", " 800W " four class conversions.At this moment be provided with two kinds judge time T o1 and To2 (＜To1), when " cooking time T＜To2 ", select strong output " 800W ", select strong output " 700W " when " To1＞cooking time T 〉=To2 ", when " To1≤cooking time T ", select weak output " 500W " or " 300W ".

Implement to describe to the of the present invention the 5th below with reference to Fig. 9.The series circuit of the high-voltage capacitor 38 on high-voltage capacitor 7 and resistance 8 and the normally closed contact 39a of capacitor relay 39 is connected in parallel.In addition, on a power line 13a of mains ac power supply 13, be connected with the normal opened contact 40a of main relay 40.

Under the situation of above-mentioned formation, control device 16 is added to power supply on the coil 40b of main relay 40 by drive circuit 41 when detecting the operation that adds hot key 19 or hot wine key 20.Normal opened contact 40a with main relay 40 is converted to closed condition then, and the primary coil 5a from the AC mains source to high-tension transformer 5 supplies power supply.At this moment, power supply is selectively supplied with the coil 39b of capacitor relay 39, the normal opened contact 39a of capacitor relay 39 is selectively connected, select cooking power output by drive circuit 42.In this case, owing to the expensive phase inverter that can abolish based on IGBT15, so reduced installation cost.

In addition, in above-mentioned the 1st to the 5th embodiment, be to adopt electrostatic capacitive weight sensor 29, but also be not limited only to this, for example also can adopt the inductance type weight sensor.

In addition, in above-mentioned the 1st to the 5th embodiment, be on liquid crystal indicator 31, to show output " 500W " and " 700W " with numeral, but also be not limited only to this, for example also can adopt scale to represent to cook power output " 500W " and " 700W ", perhaps cook power output with representing that the signs such as indicator lamp of " 700W " show.

In addition, in above-mentioned the 1st to the 5th embodiment, be the selection result that on display unit 31, shows output " 500W " and " 700W ", still also be not limited only to this, sound notification such as loudspeaker for example also can be installed.

In addition, in above-mentioned the 1st to the 5th embodiment, be that the present invention is used for microwave cooked special machine, but also be not limited only to this, for example also can be used for having the food heating generator of heater cooking function.

Claims

1, a kind of micro-wave oven is characterized in that having:

The cooking room that holds gratin;

Magnetron to above-mentioned cooking room internal radiation microwave;

Detect the Weight detecting device of above-mentioned gratin weight;

2, the micro-wave oven of putting down in writing as claim 1 is characterized in that:

3, the micro-wave oven of putting down in writing as claim 2 is characterized in that:

4, the micro-wave oven of putting down in writing as claim 1 is characterized in that:

Measuring device with the instrumentation duration of runs and dwell time;

5, the micro-wave oven of putting down in writing as claim 4 is characterized in that:

6, the micro-wave oven of putting down in writing as claim 1 is characterized in that:

7, the micro-wave oven of putting down in writing as claim 1 is characterized in that:

Has the cooking program options button of selecting cooking program;

8, the micro-wave oven of putting down in writing as claim 1 is characterized in that:

9, as each micro-wave oven of putting down in writing in claim 1 or 2 or 4, it is characterized in that:

Output selection device shows the selection result of output on display unit.