JPH0323164B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a rice cooker that automatically performs each process of water absorption, rice cooking, shading, and heat retention, and is provided with a test terminal to facilitate testing and inspection. This is related to a rice cooker.

[Conventional technology]

Conventional rice cookers have realized two different modes depending on the signal applied to the test terminal.

For example, when applying a LOW signal to the test terminal,
When the mode is in the normal mode that realizes each process of water absorption, rice cooking, cooking, and heat retention, and a High signal is applied,
The mode is now set to omit the water absorption process.

However, while this method has the advantage of applying a high signal to the test terminal and omitting the water absorption process when inspecting rice cooking on the assembly line, it is difficult to check all processes during control circuit testing, inspection, or service. Therefore, the above method alone has the disadvantage that it takes a lot of time.

[Summary of the invention]

This invention was made in view of the above points,
A test terminal, which is connected to the test terminal, and which performs at least one of the water absorption, rice cooking, uneven cooking, and heat retention processes according to a predetermined signal applied to the test terminal.
It is equipped with a test mode means that realizes the process in a time reduction mode that is shorter than the normal mode. For example, when a pulse signal is applied to the test terminal, the time of the water absorption process and unevenness process is at least 1/60 or less. The above-mentioned conventional disadvantages are solved by shortening the time to .

[Embodiments of the invention]

An embodiment of this invention will be described below.

FIG. 1 is an overall configuration diagram of an embodiment of a rice cooker according to the present invention.

As is clear from FIG. 1, the rice cooker of this embodiment is provided with a heating element 2 for heating an inner pot 1 and a test terminal 3, and a signal from the test terminal 3 is input to select a normal mode by a test mode selection means 4. 5, water absorption step omission mode 6, and time reduction mode 7 are realized, and the heating body 2 is controlled according to each mode.

FIG. 2 is a sectional view of the rice cooker main body used in the embodiment of FIG. 1.

In the figure, 8 is an outer pot, and an inner pot 1 containing rice and water is placed inside the outer pot. 3 is a test terminal provided on the control board 9 on which the control circuit is mounted. 10 is an outer lid, and 11 is a removable inner lid. 1
2 is the outer casing.

FIG. 3 is a circuit diagram showing the electrical connections of the embodiment of FIG. 1.

In the figure, 16 is an input circuit 17, a memory 18,
It is a microcomputer with a built-in CPU 19 and an output circuit 20.

35 is a time base circuit, which is composed of a resistor 21, a transistor 22, and a resistor 23, and its input is connected to the power supply V _A terminal 13, and its output 24 is input to the input terminal 29 of the input circuit 17, and is used for each process. Microcomputer 1 is the reference time for time setting.
Provided at 6.

36 is a test circuit, test terminal 3, power supply V _SS
It is composed of a terminal 26 connected to the terminal 14, a terminal 25 connected to the output 24 of the time base circuit 35, and a resistor 27. The test terminal 3 is connected to the input terminal 28 of the input circuit 17.

A resistor 30 , a transistor 31 , a resistor 32 , and a bidirectional thyristor 33 are connected to the output of the output circuit 20 to control the heating body 2 .

The V _SS terminal 14 is the power supply for the time base circuit 35, the test circuit 36, and the microcomputer 16, the V _C terminal 15 is the gate power supply for the bidirectional thyristor 33, and 34 is the commercial frequency power supply.

Next, the operation of the above embodiment will be explained with reference to FIGS. 4 and 5.

Figure 4 shows the memory 1 of the microcomputer 16.
8 is a flowchart showing the test mode selection program stored in the test terminal 8, and FIG. 5 is a waveform diagram showing the process of generating the pulse voltage applied to the test terminal 3.

First, when cooking rice, when the power is turned on, if test terminal 3 is LOW in steps 37 and 38, that is, if test terminal 3 is not connected to terminals 25 and 26, steps 40, 41, and 4 are performed.
Proceed to step 2, 43 and return to normal mode, that is, output circuit 20, resistor 30, transistor 31, resistor 3
2. The heating body 2 heats the inner pot 1 by the control section composed of the bidirectional thyristor 33 to deliciously cook rice and keep it warm.

Next, in step 37, if the test terminal 3 is not LOW, the process proceeds to step 38. Therefore, if the test terminal 3 is continuously high, that is, if the test terminal 3 is connected to the terminal 26, the water absorption process labor-saving mode is entered in which the water absorption process in step 40 is omitted and the processes in and after step 41 are realized. .

Further, in step 38, if the test terminal 3 is a pulse voltage, that is, if the test terminal 3 is connected to the terminal 25 connected to the output 24 of the time base circuit 35, the process proceeds to step 39, which is a time reduction program. It becomes a time saving mode that executes 40 or less steps.

Here, the time required for the water absorption and smearing processes is reduced to at least 1/60 of the normal time.
This pulse voltage is generated by the time base circuit 35, and as shown in FIG.
The voltage waveform shown in C is obtained via the transistor 22 by inputting the voltage B of the V _A terminal 13 which is synchronized with the voltage A of 4.

〔Effect of the invention〕

As described above, according to this invention, water absorption, rice cooking,
In a rice cooker that automatically performs each process of heating and heating, we have realized a time-saving mode that is shorter than the normal mode in response to a predetermined signal applied to the test terminal, and can test the rice cooker itself and the control section. Since inspection is made easier, workability and serviceability can be improved.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of an embodiment of a rice cooker according to the present invention, Fig. 2 is a sectional view of the main body of the rice cooker, Fig. 3 is a circuit diagram showing its electrical connections, and Fig. 4 is the operation of this example. FIG. 5 is a waveform diagram showing the process of generating the pulse voltage applied to the test terminal. In the figure, 3 is a test terminal, 4 is a test mode selection means, 5 is a normal mode, 6 is a water absorption process omission mode, and 7 is a time reduction mode.

Claims (1)

[Claims] 1. In a rice cooker that automatically performs the processes of water absorption, rice cooking, heating, and heat retention, the rice cooker automatically performs water absorption, rice cooking, and heat retention according to a test terminal and a predetermined signal connected to the test terminal and applied to the test terminal. A rice cooker characterized by being provided with test mode means for realizing at least one of the unevenness and heat retention processes in a time reduction mode that is shorter than the normal mode.