JP3055251B2 - Rice cooker control circuit - Google Patents

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, with the development of electronic devices, the causes of noise have been increasing, and devices that are strong against the noise have been demanded.

[0003] A conventional jar rice cooker temperature detecting device 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, 2 is a DC power supply circuit, and supplies a DC voltage to the circuit. Reference numeral 3 denotes a bottom heater and 4 denotes 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, respectively. 9 is a temperature detecting means connected to the thermistor 9a to detect the temperature, 10 is a counter for counting the number of times of measuring a certain temperature, 11 is a heating 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. Then, when the same temperature is continuously input several times, the temperature at that time is determined as the temperature. The heating power control means 12 controls the relay driving circuit 7 and the bidirectional thyristor driving circuit 8 to drive the relay 5 and the bidirectional thyristor 6 according to the temperature value determined in this way, and the bottom heater 3 and the body heater 4 Control.

[0005]

However, in the above-described conventional configuration, the temperature may not be determined unless the same temperature is continuously input several times. In particular, it is a common situation that the input temperature is fluctuated due to noise or the like, and it is a dangerous situation that the temperature is not determined forever.

An object of the present invention is to solve the above-mentioned conventional problems and to eliminate the situation that the temperature is not determined forever and to provide a control circuit of a rice cooker which is resistant to noise.

[0007]

In order to achieve this object, a control circuit for a rice cooker according to the present invention comprises a temperature detecting means for detecting the temperature of a food, a counter for counting the number of times of temperature measurement, Storage means for storing how many times has been measured, determination means for determining the temperature with the largest number of inputs among the measured temperatures as the temperature at that time, and control for controlling the heating unit based on the temperature of the determination means Part.

[0008]

With the above arrangement, the present invention measures the temperature several times and determines the temperature with the largest number of measurements as the temperature at that time. Therefore, a situation where the temperature is not determined forever cannot occur. Even if the measured temperature changes due to noise, the temperature at that time is determined by majority of the measured temperatures, so that the influence is small.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 13 denotes an AC power supply, and 14 denotes a DC power supply circuit, which supplies a DC voltage to the circuit. 15 is a bottom heater and 16 is a body heater.
5 and 16 constitute a heating unit. In addition, each heater 1
Reference numerals 5 and 16 denote relay 17 and bidirectional thyristor 1, respectively.
8 driven. The relay 17 is a relay driving circuit 1
9. The bidirectional thyristor 18 is driven by a bidirectional thyristor drive circuit 20, respectively. 21 is thermistor 21
a is connected, temperature detecting means for detecting temperature, 22 is a counter for counting the number of measurements, 23 is storage means for storing which temperature has been inputted and how many times, and 24 is storage means 23
Determining means for determining the temperature at that time based on the information recorded in the control section, a control section for controlling the operation of the relay drive circuit 19 and the bidirectional thyristor drive circuit 20 to control the heating power of the heating section, and The counter 22, the storage means 23, the determination means 24, and the thermal power control means 25 are constituted 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 detecting means 21, the counter 22 counts up, and the storage means 23 stores that the number of times of inputting the temperature 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 stored in the storage means 23 with the largest number of times of input 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 temperature value thus determined, drives the relay 17 and the bidirectional thyristor 18, and controls the bottom heater 15 and the body heater 16. Control.

Next, the operation of the microcomputer 26 in this embodiment will be described with reference to a flowchart. In FIG. 2, first, a temperature is input in step 27, and in step 28, a 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 exceeded a certain number N. If the temperature has not reached N or more, the process proceeds 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 not less than N, go to step 31 and determine the stored temperature with the largest number of measurements as the temperature at this point.
At 3, the counter and storage are initialized, and the process returns to step 27.

As described above, 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 not determined indefinitely cannot occur.

In the present embodiment, the heating unit is a heater. However, it is also possible to employ an induction heating system for generating heat in a container for storing the object to be cooked, or a heating unit using a gas combustor. Not even.

[0015]

As described above, according to the present invention, a situation in which the temperature is not determined indefinitely cannot occur, and the temperature at that time is determined by a majority decision of the measured temperatures. Even if it does, it has little effect. Therefore, there is no danger of performing a strange operation without determining the temperature forever, and a control circuit of the rice cooker which is resistant to noise can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit of a rice cooker in one 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]

 DESCRIPTION OF SYMBOLS 21 Temperature detection means 22 Counter 23 Determination means 24 Storage means 25 Control part

Continuation of the front page (72) Inventor Konzo, S.3, 1006, Kazuma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-63-54123 (JP, A) JP-A-62-284618 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47J 27/00 G05D 23/19

Claims (1)

(57) [Claims] 1. A temperature detecting means for detecting a temperature of an object to be cooked, a counter for counting the number of times of temperature measurement, a storage means for storing which temperature has been measured and how many times, A control circuit for a rice cooker, comprising: determining means for determining a temperature having a large number of inputs as a temperature at that time; and a control unit for controlling a heating unit based on the temperature of the determining means.