JPS5858566B2 - heating cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking device that automatically sets a heating cooking time depending on the amount and type of food to be cooked, and operates a heating source within this time range.

Generally, in heating cooking devices such as microwave ovens, the cooking time is set by a timer.

Therefore, each time you set the cooking time,
It is necessary to find out the optimum cooking time required for the food to be cooked, which has the disadvantage that setting the cooking time is very troublesome and it is not possible to obtain an accurate cooking time for the food to be cooked.

Therefore, in order to solve this drawback, in the past, a device as shown in JP-A-49-129937, for example, has been invented. The structure is such that a pulse signal is output, the number of pieces is counted in accordance with the weight of the cooked food, and when this count reaches a predetermined value, the oscillation operation of the magnetron, which is the load, is stopped.

However, as described above, this conventional device has a structure in which a pulse signal with a different period is output for each cooked food, which makes the pulse signal output circuit complicated and increases the cost.

The present invention was invented based on such conventional drawbacks, and it outputs a pulse signal at a constant cycle regardless of the type of food, and on the other hand, it outputs a pulse signal at a constant cycle regardless of the type of food. The time is determined in advance based on experimental values, and the required heating time is calculated based on the total amount of food to be heated based on this heating time, and the pulse signal of the constant cycle is counted as the heating time value calculated by this calculation. When the numbers match, the output of the heating means such as a magnetron, which is the load, is stopped, and in addition, the above-mentioned load is intended to be operated intermittently at regular intervals. It is.

Hereinafter, a practical example of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a perspective view of a microwave oven embodying the present invention, Fig. 2 is its electrical circuit diagram, and Fig. 3 is a specific circuit diagram of the control circuit section included in this circuit. It shows.

1. In Figure 1, 1 is the microwave body, 2 is the door, and 3
is an operation panel, and this operation panel has a push-button food selection switch (provided for each food such as fish, meat, eggs, vegetables, etc.) 4, and a return switch for these. 5, cooking switch 6, stop switch 7, continuous/disconnect switch 8 applied during defrosting, etc., food amount setting means 9,
The food selection switch 4 is provided with heating time setting means 10 for basic unit amounts of food, cooking and thawing display lamps 11 and 12, etc., which are not provided in the food selection switch 4.

Similarly, the food amount setting means 9 is composed of a weight scale M marked in an annular shape and a knob 9' provided with a corresponding index m on the operation panel 3. The setting means 10 is comprised of a time scale T marked linearly on the operation panel 3 and a knob 10' that can be slid laterally and laterally along the time scale T.

Next, in Fig. 2, ■ is an AC power supply, TR is a high-voltage transformer, Mg is a magnetron, and 13 is a control circuit section. When the switch 6 is turned on, the control circuit section 13 operates according to a preset mode, turning on the thyristor SCR, and in conjunction with this, the high voltage transformer TR is turned on via the relay switch S1 of the first control relay R1. It is designed to perform oscillation operation in order to enable the application of power supply voltage to the primary side.

When the predetermined heating is completed, a termination signal S is applied from the control circuit section 13 to the base of the switch transistor Tr, which turns ON, energizes the second control relay R2, and turns off the relay switch R82.
By doing so, the power supply circuit of the high voltage transformer TR is opened.

Similarly, R3 is energized when the cooking switch 6 is turned on, and a self-holding switch R is inserted in parallel with this switch 6.
83 is a relay that forms a self-holding circuit.

14 is a rectifier inserted between the control circuit 13 and the AC power supply V.

Further, the stop switch 7 is inserted directly between the power source V and the control circuit section 13, and an interlocking switch 7' connected in parallel to the door switch DS is interlocked with the stop switch 7.

Now, next, the configuration of the above-mentioned control circuit section 13 will be described.

That is, it is shown in Fig. 3, where A is the basic heating time setting section per unit amount (weight, number, etc.) of food, and the above food selection switch 4 is set. These return switches 5 and the food selection switch 4...
ROM1 which stores the basic heating time value for each food recorded in . . . and outputs the basic heating time signal t1 of the selected food; this and the food selection switch 4.
. . . and a buffer register 15 provided between the .

B is a food amount setting section, which includes a variable resistor 16 linked to the food amount setting knob 9', and A/A which converts changes in current value based on the operation of this variable resistor 16 into a coded amount signal G. It consists of a D converter 17.

18 is an arithmetic circuit which calculates the basic heating time value sent from the ROM 1 and the amount of food sent from the A/D converter, and outputs a total heating time signal T corresponding to the total amount of food to be heated. It is something to do.

That is, for example, if the basic heating time value t1 is X minutes per 100 grams of food weight and the total amount of food is 300 grams, the calculation is 300/100XX minutes=3X minutes.

C is a basic heating setting section for foods that are not recorded in the food selection switch 4, . Based on this operation, the A/D converter 20 converts the change in current value into a coded digital signal, and based on the signal obtained from this, the basic heating time signal t2 is sent to the arithmetic circuit 18 according to the stored contents. It consists of an output ROM2.

21 inputs the total heating time signal T outputted from the arithmetic circuit 18 through the storage circuit 22, and when the total heating time value matches the count time value from the heating time counter described later, the end signal is sent. This is a comparison/number construction circuit that outputs S to the switch transistor Tr.

D is a continuous/disconnection switching unit that switches between continuous and intermittent operation according to ON/OFF of the continuous/disconnection changeover switch 8, and a continuous pulse signal P with a constant period from an oscillator 23 provided in the preceding stage. A certain number m (for example, 10
m counter 24 which returns to O when counting (0) and repeats the operation of counting up to m again, and this counter 2.
Observe the count contents of 4 and find that the count contents are n (
For example, when the count value of the counter 24 is m Detects the count-over signal CO output when the count reaches 1, outputs a return signal f, and switches the flip-flops F-F.
The m detection circuit 26 deactivates the interrupt signal Q outputted from the oscillator 23 and returns the m counter 24 to O, and the oscillator 23 On the other hand, when the continuous changeover switch 8 is ON, if there is no interrupt signal Q, the pulse signal is continuously output, and if there is an interrupt signal Q, the pulse signal is output continuously. It is composed of a switch circuit section 27 having several gate circuit sections 1 to g that are stopped.

In addition, in this connection/disconnection switching section, the counter 24 is set to m counters, and each of the detection circuits 25 and 26 is fixed to n and m1, but it is not possible to fix such values. The value is not limited in any way, and it is conceivable to make the value variable as necessary by using an appropriate circuit configuration or the like.

28 is a detector that detects the pulse signal P from the connection/disconnection switching section and outputs the signal to the gate of the thyristor SCH; 29 is a detector for detecting the pulse signal P output from the connection/disconnection switching section; A frequency divider circuit outputs one pulse signal y every time 5 pulses are input, and 30 is a heating time counter that counts the pulse signal y output from this frequency divider circuit. The signal is converted into a time signal 7 and applied to the comparison/number generation circuit 21.

In addition, 32 is a continuous line when the stop switch 7 is turned on.
This is a switch circuit that cuts off between the disconnection switching section and the oscillator 23.

The present invention is constructed in a diagonal manner, and its operation will be explained below.

An example will be explained in which 500 grams of meat is cooked normally without being shredded.

When such meat is stored in the oven and door 2 is closed, the door switch DS is turned OFF in the electric circuit shown in FIG.
Do N.

In this state, the food selection switch 41 corresponding to meat is
At the same time as turning ON, set the index m to 50 Q: Durham on the weight scale M by operating the knob 9'.

In this state, when the cooking switch 6 is turned on, the control circuit 13 is energized through the rectifier 14, and the energization is continued through the relay R3 and the self-holding switch R83.

In this way, when the control circuit section 13 is energized, on the one hand, based on the start of operation of the oscillator 23, the connection/disconnection switching section transmits the pulse signal P to the heating time counter 30 via the frequency dividing circuit.
At the same time, it is applied to the gate of the thyristor SCR via the detector 28, making it conductive and energizing the first control relay R1.

Then, the relay switch R81 is turned on to close the power supply circuit of the high voltage transformer TR and cause the magnetron Mg to oscillate.

Of course, the counter 30 starts counting.

On the other hand, the arithmetic circuit 18 selects the selected food selection switch 4.
1 (basic heating time value = X minutes per 100 grams of meat)
and the amount signal G (500
A total heating time signal T indicating a heating time value of 5X is outputted, and this signal T is sent to a comparison/number construction circuit 21 via a storage circuit 22.

Therefore, in this state, the magnetron Mg oscillates to heat the meat as described above, and the heating time counter 3
0 counts the pulse signal Bi and sends the count information via the decoder 31 to the comparison/number construction circuit 21. The detection circuit 21 receives the time signal 7 from the decoder 31 and the total heating time signal T. compare.

Then, when the heating progresses and the time signal 7 matches the total heating time signal T, the comparison-number circuit 21 outputs the end signal S to the base of the switch transistor Tr and turns it on.
By energizing the second control relay R2, the relay R82 is set to 0FFL and the power supply circuit of the high voltage transformer TR is opened.

That is, the oscillation operation of the magnetron is stopped.

Incidentally, during such heating cooking, if it is necessary to stop the heating for some reason, the stop switch 7 can be turned on.

That is, when the switch 7 is turned on, the switch circuit 32 is operated accordingly, and the pulse signal P output from the oscillator 23 is not sent to the subsequent connection/disconnection switching section, so that each counter 24.30 I memorized what I had counted so far 1
Stop counting at 1.

On the other hand, since the signal to the gate terminal of the thyristor SCR also stops, its conduction is stopped and the first control relay R1
, the power circuit of the high-voltage transformer TR is temporarily opened via the relay switch R81, and the oscillation operation of the magnetron Mg is stopped.In this state, when the door 2 is opened, the door switch DS is turned OFF and the oscillation operation of the magnetron Mg is stopped. As a result, relay R3 is no longer energized and relay switch R83
is OF'F.

However, at this time, since the control circuit section 13 is kept energized via the stop switch 7 and the interlocking switch 7',
Each of the counters 24, 30 continues to store the contents of the counter, and the storage circuit 22 continues to store the total heating time value.

Therefore, if you close the door 2 again and turn on the cooking switch 6, the stop switch 7 (and the interlocking switch 7) will return to OFF and the relay switch R83 will self-hold the relay R3. In conjunction with this, in the control circuit section 13, the switch circuit 32 is turned on, and the pulse signal P from the oscillator 23 is sent again to the detector 28 and the frequency dividing circuit 29 via the connection/disconnection switching section. , the oscillation operation of the magnetron Mg is restarted, and the counter 30 starts counting again and adds the number of pulses to the above-mentioned stored content.

This operation is performed when the comparison and number construction circuit 21 receives the same signals from the decoder 31 and the storage circuit 22.

The above explanation is the operation for the food recorded in the food selection switch 4.
If the food is not recorded in the table, set the basic heating time for the basic amount of the food to the desired value on the time scale T on the operation panel 3 by operating the knob 10', and set the total amount of the food to be heated using the knob 9. This can be done by setting .

That is, when the knob 10' is operated, the variable resistor 19 changes its resistance value and the current changes accordingly.
The signal is applied to the D converter 20.

The converter accordingly sends a coded digital signal to the ROM 2, and the ROM 2 sends a basic heating time signal t2 to the arithmetic circuit 18 based on the signal.

The calculation circuit 18 calculates the basic heating time indicated by the signal t2 and the total food amount indicated by the rice amount signal G sent from the A/D converter 17 as described above, and generates the total heating time signal T. Output.

Other operations are the same as those for heating using the food selection switch described above.

Next, intermittent operation required for thawing and heating will be explained.

In this case, when setting the basic heating time of the food, the operation knob 10' of the heating time setting means 10 may be operated to set the basic heating time of the food even if the food is recorded in the food selection switch.

Now, a case will be explained in which a frozen fish is to be thawed.

When the basic heating time is set with the knob 10' and the total amount of food is set with the knob, and the cooking switch 6 and the defrosting switch 8 are turned on, the calculation circuit 18 calculates the required total heating time as described above and displays the results. The comparison signal is sent to the number configuration circuit 21.

On the other hand, in the connection/disconnection switching section, the counter 24 starts counting, but if the count does not reach n, the interrupt signal Q is not output from the Noritsubu flop FF, so the gate circuits g1+g2 are decompressed. When the switch 8 is turned ON, one input terminal receives a signal of Lebel, but the output is turned OFF.
keep it level.

Therefore, the subsequent gate circuit ga t g< and g5 are O
N, the pulse signal P is sent from the oscillator 23 to the detector 28 to oscillate the magnetron Mg, and the counter 30
The number of pulses is counted, and the resulting heating time is applied to the comparison/number calculation circuit 21.

When such an action progresses and the count value of the counter 24 reaches n, the n-number detector 25 detects this and immediately sends a signal to the flip-flop FF, which outputs an interrupt signal Q.

Then, based on this, the gate circuit g1 outputs the Lebel signal, so the output of the gate circuit g3 becomes 0 level, and the gate circuit g stops outputting the pulse signal P and interrupts the oscillation operation of the magnetron Mg. At the same time, the counter 30 stores the number of pulses counted up to that point.
Interrupts force und action.

Such an interrupted state continues while the counter 24 counts up to m (m - n). Therefore, when the counter 24 reaches m counts, the counter 2
4 outputs the count over signal CO to the gate circuit g2 and the m detectors 26.

Then, the m-number detector 26 detects that the counter 24 has counted m, and based on this, it outputs a return signal f to return the counter 24 to O and reset the flip-flop FF. to deactivate the interrupt signal Q.

Therefore, the counter 24 starts counting again and the output of the gate circuit g1 returns to the O level, so a pulse signal is output from the gate circuit g, and the output of the gate circuit g1 returns to the O level.
adds and counts pulses to the above-mentioned number of stored pulses, and successively sends the result to the comparison/number construction circuit 21. On the other hand, the detector 28 restarts the oscillation of the magnetron via the thyristor SCR or the like.

Thereafter, such actions are repeated, and the magnetron Mg performs intermittent oscillation to thaw the frozen fish.

This effect also occurs when the count number of the counter 30 and the total heating time sent from the arithmetic circuit 18 are compared.
Finish by matching a number of circuits.

As shown diagonally above, the present invention calculates the basic heating time per unit amount of food set in the basic heating time setting section and the total food amount set in the food amount setting section using an arithmetic circuit, and calculates the total amount of food that is the result. The heating time signal is sent to the comparison circuit, and on the other hand, the oscillator continuously sends a constant period pulse signal to the heating time counter, and the counter uses the counted number as the heating time signal to perform the comparison circuit described above. The comparison circuit is configured to output an end signal when the total heating time and the heating time from the heating time counter match, and thus the load which is the heating means Since the oscillator is designed to open from the time when the pulse signal output from the oscillator starts until the end signal is output, the structure can be easily broken down since only one oscillator is required, and the pulse signal from this oscillator is Reliable operation can be expected because the signals are added and counted and the count a and the total heating time required to heat the food are compared and matched as a heating time value.

Further, in the present invention, a continuous/disconnect switching section is further provided between the oscillator and the heating time counter, so that when the core section is set to continuous, the pulse signal from the oscillator is passed continuously, and when the core section is set to intermittent, the pulse signal is passed through continuously. This is an excellent invention that allows intermittent operation of the load as required by passing the load intermittently.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heating cooking device according to the present invention, FIG. 2 is an electrical circuit diagram of the device, and FIG. 3 is a diagram showing the components included in the electrical circuit.
FIG. 2 is a block electrical circuit diagram showing the contents of a control circuit section. A(C)... Basic heating time setting section, B... Food amount setting section, D... Continuation/disconnection switching section, 18... Arithmetic circuit, 2
1... Comparison-number construction circuit, 23... Oscillator, 30.
... Heating time counter, Mg... Magnetron.

Claims (1)

[Claims] 1 Calculates the basic heating time per unit amount of food set in the basic heating time setting section and the total amount of food set in the food amount setting section, and compares the resulting total heating time signal with a coincidence detection circuit. On the other hand, the oscillator continuously sends a constant period pulse signal to the heating time counter, and the counter sends the counted number as a heating time signal to the comparison-number construction circuit, and the comparison-number The circuit is configured to output an end signal when the total heating time and the heating time from the heating time counter match, and the load, which is the heating means, outputs the end signal from the time when the output of the pulse signal from the oscillation starts. Further, a quick cut switching section is provided between the oscillator and the heating time counter, and when the switching section is set to continuous, the pulse signal is passed continuously, and the pulse signal is passed intermittently. A heating cooking device characterized in that during setting, the load is passed intermittently and the load is switched between continuous and intermittent operation.