JPH0137930B2 - - 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.

[Prior art]

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,
It is equipped with a test terminal and a mode selection means connected to this test terminal to realize three test modes according to the signal applied to the test terminal.For example, when a LOW signal is applied to the test terminal, , the mode is set to perform each process normally, and the High
When a signal is applied, the mode is set to omit the water absorption process, and when a pulse signal is applied, the time for the water absorption process and unevenness process is shortened to at least 1/60 or less, thereby eliminating the above-mentioned disadvantages of the conventional method. It has been resolved.

[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 the inner pot 1 and a test terminal 3, and a signal from the test terminal 3 is input to determine whether the rice cooker is normal or not. Mode 5,
It is configured to realize water absorption process omission mode 6 and time reduction mode 7, and to control the heating body 2 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; its input is connected to the power supply V _A terminal 13; its output 24 is input to the input terminal 29 of the input circuit 17; A reference time for time setting is provided to the microcomputer 16.

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 connected to a time base circuit 35, a test circuit 36, and a microcomputer 16.
, the V _C terminal 15 is a gate power source for the bidirectional thyristor 33, and 34 is a commercial frequency power source.

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

FIG. 4 is a flowchart showing the test mode selection program stored in the memory 18 of the microcomputer 16, 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, 42, and 43 are performed. In the normal mode, the heating element 2 heats the inner pot 1 to cook rice deliciously and keep it warm. .

Next, in step 37, if the test terminal 3 is not LOW, the process proceeds to step 38. Therefore, if test terminal 3 is continuously high, that is, if test terminal 3 is connected to terminal 26, step 40 is performed.
The water absorption process becomes labor saving mode, which skips the water absorption process and implements the process from step 41 onwards.

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 program proceeds to the time reduction program of step 39, and then proceeds to step 40. It will be in time saving mode to execute the following 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 warming, we have realized three test modes depending on the signal applied to the test terminal, making it easier to test and inspect the rice cooker itself and the control section. Improved workability and serviceability can be achieved.

[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 a diagram of the rice cooker according to the present embodiment. A flowchart showing the operation, 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, water absorption process omission mode, and 7
is a time saving mode.

Claims (1)

[Scope of Claims] 1. A rice cooker that automatically performs each process of water absorption, rice cooking, uneven cooking, and heat retention, including a test terminal, and a signal connected to the test terminal and applied to the test terminal. A rice cooker characterized by being provided with test mode selection means for realizing each mode of a normal mode, a water absorption process omission mode, and a time reduction mode. 2. The rice cooker according to claim 1, wherein the test mode selection means is implemented by a microcomputer.