JPH05103722A - Control circuit for rice cooker - Google Patents

Abstract

PURPOSE:To provide a rice cooker control circuit having the capability of eliminating state where temperature cannot be set continuously due to the effect of a noise or the like, and providing high resistance against a noise. CONSTITUTION:Every time a temperature detection means 21 inputs a temperature signal, a counter 22 counts the signal, and a memory means 23 memories the fact that the input counts of the temperature increases by one. The temperature signals are inputted as mentioned, and when the counter 22 counts up to a certain value, a decision means 24 determines a temperature signal most frequently inputted and saved in the memory means 23 as current temperature. According to this construction, the control circuit of a rice cooker becomes free from state where temperature cannot be decided continuously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker control circuit.

[0002]

2. Description of the Related Art In recent years, factors of noise have been increasing with the development of electronic devices, and devices strong against the noise have been required.

A conventional temperature detecting device for a jar rice cooker will be described below. FIG. 3 shows a configuration of a control circuit of a conventional jar rice cooker. In FIG. 3, 1 is an AC power supply and 2 is a DC power supply circuit, which supplies a DC voltage to the circuit. 3 is a bottom heater and 4 is a body heater, which are driven by a relay 5 and a bidirectional thyristor 6, respectively. The relay 5 is driven by a relay drive circuit 7, and the bidirectional thyristor 6 is driven by a bidirectional thyristor drive circuit 8. Reference numeral 9 is a temperature detecting means to which the thermistor 9a is connected to detect the temperature, 10 is a counter for counting the number of times of measurement of a certain temperature, 11 is a thermal power control means for controlling the operation of the relay drive circuit 7, the bidirectional thyristor drive circuit 8, The counter 10 and the thermal power control means 11 are built in the microcomputer 12.

The operation of the control circuit of the jar rice cooker configured as described above will be described below. When the temperature is input from the temperature detecting means 9, the counter 10 counts up. When the same temperature is continuously input several times, the temperature at that time is determined as the temperature. The thermal power control means 12 controls the relay drive circuit 7 and the bidirectional thyristor drive circuit 8 to drive the relay 5 and the bidirectional thyristor 6 according to the value of the temperature thus determined, and the bottom heater 3, the body heater 4 To control.

[0005]

However, in the above-described conventional configuration, the temperature may not be determined unless the same temperature is continuously input several times. Especially, it is a common condition that the input temperature is fluctuated by noise or the like, and it is a dangerous situation that the temperature is not determined indefinitely.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a control circuit for a rice cooker that is resistant to noise by eliminating the situation where the temperature is never determined.

[0007]

In order to achieve this object, the control circuit of the rice cooker according to the present invention comprises a temperature detecting means for detecting the temperature of the food to be cooked, a counter for counting the number of times of temperature measurement, and which temperature. Storage means for storing how many times the temperature has been measured, determining means for determining the temperature with the highest number of inputs among the measured temperatures, and control for controlling the heating unit by the temperature of the determining means. Have a section.

[0008]

According to the present invention having such a configuration, the temperature is measured several times and the temperature with the largest number of measurements is determined as the temperature at that time. Therefore, a situation in which the temperature is never determined cannot occur. Even if only the measured temperature changes due to noise, the temperature at that time is determined by the majority vote of the measured temperatures, so the influence is small.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 13 is an AC power supply and 14 is a DC power supply circuit, which supplies a DC voltage to the circuit. Reference numeral 15 is a bottom heater and 16 is a body heater.
The heating units 5 and 16 are formed. Also, each heater 1
5 and 16 are a relay 17 and a bidirectional thyristor 1, respectively.
Driven by 8. The relay 17 is the relay drive circuit 1
9. The bidirectional thyristor 18 is driven by the bidirectional thyristor drive circuit 20, respectively. 21 is the thermistor 21
a is connected and temperature detection means for detecting the temperature, 22 is a counter for counting the number of times of measurement, 23 is a storage means for storing which temperature is input and how many times, 24 is a storage means 23
Determining means for determining the temperature at that time based on the information recorded in the above, 25 is a control part for controlling the operation of the relay drive circuit 19, the bidirectional thyristor drive circuit 20 to control the heating power of the heating part, and The counter 22, the storage means 23, the determination means 24, and the thermal power control means 25 are configured by a microcomputer 26.

The operation of the control circuit of the jar rice cooker configured as described above will be described below. When the temperature is input by the temperature detection means 21, the counter 22 counts up, and the storage means 23 stores that the number of times the temperature has been input is increased by one. Enter the temperature like this,
When the value of the counter 22 reaches a certain value, the determining means 24
Determines the temperature with the largest number of inputs stored in the storage means 23 as the temperature at that time. The thermal power control means 25 controls the relay drive circuit 19 and the bidirectional thyristor drive circuit 20 according to the thus determined temperature value to drive the relay 17 and the bidirectional thyristor 18, and the bottom heater 15 and the body heater 16 are connected. To control.

Next, the operation of the microcomputer 26 in this embodiment will be described using a flow chart. In FIG. 2, first, in step 27, the temperature is input, and in step 28, the counter that counts the number of times of temperature measurement is counted. In step 29, it is determined whether or not the value of the counter has reached a certain number N or more. If it has not reached N or more, the process goes to step 30, stores the input temperature and the fact that the number of times of input of this temperature has increased by 1, and returns to step 27. If it is equal to or higher than N, go to step 31, determine the one with the largest number of measurements among the stored temperatures as the temperature at this point, and execute steps 32 and 3
The counter and memory are initialized in step 3, and the process returns to step 27.

In this way, the temperature is measured several times, and the temperature with the largest number of measurements is determined as the temperature at that time.
A situation where the temperature is indefinite is impossible.

In this embodiment, the heater is used as the heater, but an induction heating system may be used in which a container containing the food to be cooked is heated, or a heating unit using a gas combustor may be used. There is no end.

[0015]

As described above, according to the present invention, a situation in which the temperature is not determined indefinitely does not occur, and the temperature at that time is determined by the majority decision of the measured temperature, so that the measured temperature may be changed. Even if it happens, it will have little impact. Therefore, it is possible to obtain a control circuit for a rice cooker that does not have a risk that the temperature will not be determined forever and that the operation will be strange and that is resistant to noise.

[Brief description of drawings]

FIG. 1 is a block diagram of a control circuit of a jar rice cooker according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the microcomputer.

FIG. 3 is a block diagram of a control circuit of a jar rice cooker in a conventional example.

[Explanation of symbols]

 21 temperature detection means 22 counter 23 determination means 24 storage means 25 control unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Konno Shozo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A temperature detecting means for detecting the temperature of an object to be cooked, a counter for counting the number of times the temperature is measured, a storage means for storing which temperature and how many times the temperature is measured, and one of the measured temperatures. A control circuit for a rice cooker, comprising: a determining unit that determines a temperature having a large number of inputs as the temperature at that time; and a control unit that controls the heating unit according to the temperature of the determining unit.