JPS5927494A - Electronic range - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave oven that automatically controls defrosting and cooking time according to the weight of defrosted food.

In general, good thawing means that the thawed food has a uniform finish and is not partially discolored or overcooked, and the advent of microwave ovens that can thaw food evenly even if the weight of the food changes. I was wanted.

By the way, in the defrosting cooking sequence in a conventional microwave oven, the total microwave heating time (in seconds) is calculated as follows: T=KG+A (K, A: constant, G: food weight) (1
) is set in proportion to the edible weight G, and further, this total heating time T is divided into the first stage A and the second stage B as shown in the following formula, and the heating time for each is set as tl = KIT (Kl: constant) (2) t2
= 2T (K2, constant) (3) As shown in Fig. 1, the heating time t1 of the first stage A is "strong" heating due to the continuous oscillation of the magnetron, and the heating time t2 of the second stage B is the heating time t2 of the magnetron. Due to intermittent operation of
"Weak" heating is carried out, each proportional to the total heating time T.

In this case, the output of the second stage B is fixed, that is, the ratio of ON and OFF of the magnetron is constant, so if the output of the second stage B is set high, one intermittent zero
If the microwave energy irradiated to the food during the 8 hours is large and the weight of the food is light, it is likely to be partially cooked and over-thawed, and the output of the second stage B should be set low. If the weight of the food is heavy, it will take a long time to reach the desired thawing state, and the finished product of the thawed food will not be uniform depending on the weight.The present invention was made in view of the above-mentioned points. The purpose of the present invention is to control the output of the second stage B according to the weight of the food to irradiate desired microwave energy in accordance with the weight of the food. In order to achieve this, the ON time of the magnetron in the second stage B is proportional to the weight of the food.
It is characterized by having been set.

Hereinafter, one embodiment of the present invention will be described based on illustrations.

FIG. 2 is an explanatory diagram showing a microwave oven according to an embodiment of the present invention.

In the figure, 1 is a microcomputer that includes a memory for storing various cooking sequences, data, etc., CPt], etc.
It stores and performs calculations based on input signals from the operating section 2 by the user, and outputs necessary information to the display section 3. At the same time, an output is applied to a first relay 6 that controls a cooling fan motor 5 that cools the magnetron 4 and a second relay 8 that controls energization of the primary side of the high voltage transformer 7 of the magnetron 4. 0, 9 is AC power supply, 1
0 is a fuse, 11 is a latch switch, 12 is a high voltage capacitor, and 13 is a high voltage diode.

Next, a thawing cooking sequence according to an embodiment of the present invention will be explained with reference to FIG. 3 above.

After measuring the weight of the thawed cooked food in advance, the user places it in a heating chamber (not shown), closes the door of the heating chamber, and inputs the weight of the food, heating conditions, etc. from the operation section 3; The microcomputer 1 calculates the total heating time T and the energizing time tl of the first stage A based on constants recorded in advance.

(4) The heating time of the second stage B is t2 and the second stage heat mode is entered, and thawing cooking begins. When the heating mode is entered, the first relay 6 that controls the cooling fan motor 5 that cools the symmagnetron 4 from the output terminal a of the microcomputer 1 is turned on.
At the same time, a signal is output to turn on the second relay 8 for the heating time 1 of the first stage A across the output terminal to control the energization of the high voltage transformer 7. Therefore, the magnetron 4 is heated for the heating time tl of the first stage A.
oscillates continuously.

Next, when the heating time tl has elapsed, the process moves to the second stage B, and the weight G of the food is transferred to the output terminal of the microcomputer 1.
υon time t2O due to the signal output intermittently according to
The ratio of N and off time t2OFF is t2oN=KaG (0<Ka<1) (4
) to continue heating operation.

In addition, during the heating time tl of the first stage A mentioned above, the magnetron 4 performs continuous oscillation, so there is no reed due to ring heating.
During the heating time t2 of the second stage B, the magnetron 4 is in an intermittent oscillation state, resulting in "weak" heating.

Also, the total heating time T.

The heating time t1 of the first stage A and the heating time t2 of the second stage B are set by the relational expressions shown in equations (1), (2), and (3), which are implemented in the above-mentioned conventional technology, respectively. Ru.

In this way, the heating time of the second stage B can be automatically set as the ON time t2ON of the magnetron 4 according to the weight of the food, and if the weight of the food is light, t2ON can be set automatically.
By shortening N, the output can be lowered, and if the weight is heavy, the output can be increased by lengthening t2ON.

As explained above, the present invention defrosts the food by setting the total heating time according to the weight of the food, and sets the total heating time to the "strong" output time of the microphone/double wave energy.
In a microwave oven that heats the microwave separately for the "low" output time t2 and the "low" output time t2:N>, ? Since the magnetron is equipped with a control means that can automatically set the on-time of the magnetron according to the weight of the food, if the food is light, the on-time of the magnetron at the output time t2 will be shorter and the output will be lower. At the same time, when the weight of the food is heavy, the on time at the "weak" output time t2 becomes longer and the output can be set higher, so when the weight of the food is light, the food may be partially over-thawed. All the inconveniences of partially boiled food are eliminated, and even if the weight of the food changes, a uniform thawing state can always be obtained, making it highly useful.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a decompression sequence showing a conventional example;
The figure is a main part electric circuit diagram of a microwave oven showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram showing a defrosting sequence of the present invention.

Claims (1)

[Claims] l1 In a microwave oven that thaws food by setting a total heating time according to the weight of the food, and divides the total heating time into a "strong" output time and a "low" output time of microwave energy, Microwave oven 0 characterized in that it is equipped with a control means that can automatically set the on-time of the magnetron in accordance with the weight of the food at the output time of 1 or less.