JPS603631B2 - Control method of register in microwave oven - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a register control system for a microwave oven in which a multi-step heating sequence can be programmed by key operation.

In order to defrost and cook frozen foods continuously in a microwave oven, perform low heating for defrosting in the first stage.
Subsequently, depending on the type of frozen food, intense heating (
For example, there are commercially available microwave ovens equipped with programmable microcomputers that can perform functions such as frozen Chinese steamed buns), medium heating (frozen hamburgers), and low heating (frozen chawan mushi). Applicant sells an R-900 type microwave oven. Also, as a reference, No. 7 of the magazine "Nikkei Electronics" published by Nikkei McGraw-Hill, 1977, 4, 4.
Please refer to the article ``One-chip microcomputer that controls a microwave oven'' introduced from pages 9 to 90. The above thawing and cooking of frozen food is an example of a heating sequence that can be executed by a microwave oven equipped with a programmable microcomputer. Optimal heating sequences can be programmed according to the type of food, such as heating sequences with three or more stages.

In general, a microcomputer-equipped kitchen appliance has a clock function that displays the time on a 4-digit display during programming or other times when the program is not running, and a timer function that uses this clock function to start cooking at a desired time. I can do it. In any case, when programming a multi-stage heating sequence using key operations, it is common for users to leave the area in the middle of the program, and while this is not a particular problem when programming a one- or two-stage heating sequence, In the stage heating sequence program, there were times when it became unclear what kind of information was input and up to which stage. In order to eliminate this drawback, methods such as providing an information monitoring function or automatically clearing input information after a certain period of time has passed after key operations in the program can be considered. The present invention is devised to prevent programming errors by automatically clearing the data after a certain period of time without providing a special key for clearing the data. Provides a register control method for ranges.

The figure is a block diagram of an example circuit implementing the present invention.

According to this, a household AC power supply (50/60Hz) is frequency-divided to create one pulse signal per second, and this is used as a reference signal, and even after two inkstone sand passes, key operations are required to set the program. If the cooking start button is not pressed or the cooking start button is not operated, the register 1 that stores the contents of the program is cleared. The 5/6 up counter 2 divides the frequency of the AC power supply (AC50/60Hz) and outputs one pulse signal every 5/6 cycles.
Further, the next stage IG Hayabusa up counter 3 is arranged to generate one pulse signal every second, and both counters 2 and 3 form a reference signal generation circuit block that generates a reference signal Po.

4 and 5 are IG Hayabusa down counters with a 4-bit configuration, where the former takes care of the 1st digit and the latter takes care of the IM position digit. ”, the latter is preset to “001”.

That is, in this embodiment, both counters 4 and 5 constitute a timer circuit block having a timer function for measuring a time of 2 hours. Therefore, every arrival of the reference signal Po output from the reference signal generation circuit block, that is, 1
Counts down every second, and when 2 seconds have passed, both decimal down counters 4 and 5 become "000", and the inverters 6a to 6f connected to the flip-flops of each bit
will all output “1”, and the AND gate 7,
The output of 8 becomes "1" based on the logical product. If the next program setting key operation is continued before this timer circuit block counts 20, the count contents will be cleared and the decimal down counter 4 will be set to "000''.
5 is preset to "001" and starts counting down again from 20. Here, both counters 2 and 3 of the reference signal generation circuit block mentioned above are configured to start frequency division in synchronization with the first program setting key operation. In addition, the program setting keys include numeric keys consisting of 10 keys for setting cooking time and cooking temperature, keys for selecting and setting high, medium, and low heating, and selecting and setting time heating control method or temperature heating control method. The key to
In a microwave oven with a fixed program for defrosting cooking, such as the one proposed in No. 0606 "Microwave oven with fixed program," there is a heating sequence such as a function key such as a defrost command key for instructing and setting the fixed program. refers to all keys involved in programming. As mentioned above, if you leave the device for a long time (more than 2 minutes in this example) while programming a heating sequence suitable for a certain food, of course the cooking start button will not have been operated at that time. Since the start signal Pstart is not generated and the output of the inverter 9 is "1", the AND gate 10 searches for a logical product with the output "1" of the AND gates 7 and 8 and clears the register. It generates a signal Pcl, clears the register 1 that stores the program contents, and automatically erases all the information stored up to that point.

Therefore, the user has to reprogram from the beginning, but this is safer than carelessly relying on memory and setting an incorrect program. Then, by setting the desired program and operating the cooking start button, the microwave starts operating according to the heating sequence.
Of course, even if the desired program is set, if the cooking start button is not operated, the program contents will automatically disappear after 2 hours. It is clear from the fact that Generally, a microwave oven with a microcomputer that can program the heating sequence is equipped with a 4-digit display device, which displays information such as cooking time and cooking temperature associated with program setting key operations, and also displays the microwave oven itself. When not in use, it is used as a clock display device.

Of course, a clock circuit is built in, and although it is not displayed while a program is being programmed, it switches to a clock display as soon as cooking is complete. Therefore, if the above-mentioned register clear signal Pcl is used as the switching signal, the user will see that the clock display has been switched.
It can be known that the program has been cleared, and serves as a kind of alarm device. Of course, a clear indicator lamp may be provided and blinked. As described above, according to the present invention, the program information is automatically erased when unnecessary time passes without the need for a dedicated clear key, so that the programmable electronic device can be used easily and safely. A range can be provided.

[Brief explanation of drawings]

The figure is an example of a circuit implementing the present invention. 1: Register, 2: 5/Hex up counter, 3:
1-bo Hayabusa up counter, 4,5: 1G ship down counter, Pri: preset signal, Po: reference signal, P
cl: Register clear signal.

Claims (1)

[Claims] 1. A key for setting a cooking program, a cooking start instruction means for executing the set cooking program, a register for storing the program set by the operation of the key, and counting pulses for counting. means for returning the contents of the counter to the initial state each time the key is operated; means for detecting that the contents of the counter have reached a predetermined value; and a register in response to the output of the detecting means. A control method for a register in a microwave oven, characterized by comprising: a means for clearing the memory contents of; and a register control method.