KR19980057545U - Short circuit detection device of rice cooker - Google Patents

Abstract

The present invention relates to a short-circuit alarm device of the rice cooker, comprising a heater for heating food and a temperature sensor for sensing the temperature of the heater, the first temperature value of the heater detected by the temperature sensor at the first set time (T1) ) And the second temperature value T2 of the heater at the second preset time for the heater driving time, and compares the stored first and second temperature values so that the first temperature value T1 is the second temperature value T2. If greater than or equal to the microcomputer that generates an error signal, and a buzzer that generates a buzzer sound in response to the error signal, the user can easily determine whether the short circuit of the rice cooker.

Description

Short circuit detection device of rice cooker

The present invention relates to an electric rice cooker, and more particularly to an apparatus for informing the short circuit of the heater of the electric rice cooker.

An electric rice cooker is an electric device having a function of heating moisture to properly cook food, for example, rice, and keeping warm by driving a heater, which is a heat source, and performs a multi-step cooking process sequentially. By doing so, predetermined food products, such as rice and barley rice, are cooked.

The cooking process of the electric rice cooker may be generally divided into a preheating step, a heating step, and a boiling step. Here, each step is divided according to the temperature change according to the driving of the heater mounted in the rice cooker.

The preheating step is set so that the temperature change is made smoothly for a sufficient time for the soaking of the rice, and the heating step refers to a step in which water is boiled by the heater to the end of the heating step while the rice is sufficiently preheated. The boiling step refers to a step in which rice is cooked properly by absorbing or evaporating moisture by stopping the heater.

As described above, the driving of the heater is essential in the preheating step and the heating step of the cooking process of the rice cooker. Therefore, it is obvious that the cooking process cannot be performed when an abnormality occurs in the heater.

However, the conventional electric rice cooker does not include a device or a method for determining in advance whether there is an abnormality of the heater. That is, even when the heater is short-circuited because the user does not recognize the fact that the desired cooking material can not be formed, furthermore, there was a problem that the inherent function of the rice cooker is lost.

Accordingly, the present invention has been made in order to solve the above problems, the object of the present invention is to provide a rice cooker short-circuit warning device.

In order to achieve the above object, the present invention, in an electric rice cooker having a heater for heating food and a temperature sensor for sensing the temperature of the heater, the first temperature value of the heater detected by the temperature sensor at a first set time ( The second temperature value T2 of the heater is stored during the heater driving time at T1) and the second set time, and the first and second temperature values T1 are compared to the second temperature value T2 by comparing the stored first and second temperature values. If greater than or equal to) provides an electric rice cooker comprising a microcomputer for generating an error signal and a buzzer for generating a buzzer sound in response to the error signal.

1 is a block diagram of a short circuit alarm device of the rice cooker according to the present invention

2 is a cooking process graph according to driving of the heater of FIG.

3 is a flowchart of a process of notifying a short circuit state according to the temperature value of the heater of FIG.

<Description of the code | symbol about the principal part of drawing>

10: key input unit 20: microcomputer

30: heater 40: temperature sensor

50: buzzer t1: first setting time

t2: second set time T1: temperature of t1

T2: t2 temperature e: Heating end time

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to Figure 1, a block diagram of a short circuit detection device of an electric rice cooker according to the present invention is shown.

The key input unit 10 is composed of a plurality of switches (not shown) for initially setting the cooking process of the rice cooker. The heater 30 is mounted on the lower surface (not shown) of the rice cooker to supply a heat source for heating the cooked food, and repeats the on-off operation according to each cooking step. The temperature sensor 40 senses heat according to the driving of the heater 30 and outputs a temperature value for each time to the microcomputer 20. The microcomputer 20 compares the temperature value of each heater 30 corresponding to each time that is progressed according to the present invention, and outputs an error signal to the buzzer 50 according to the comparison result. The buzzer 50 generates a buzzer sound outside in response to an error signal of the microcomputer 20.

In FIG. 2, a temperature change curve according to a running time of the heater 30 of FIG. 1 is illustrated.

'T1' represents the temperature of the heater 30 measured after the first set time t1, e.g., 30 minutes, and 'T2' represents the second set time t2, e.g., 60 minutes, The measured temperature of the heater 30 is then shown. In addition, 'e' indicates a heating end time when the driving of the heater is finished.

As shown in FIG. 2, if the heater 30 operates normally, the temperature of the heater 30 increases with time. Otherwise, for example, when a stop of the heater 30, a short circuit in the driving circuit (not shown), or the like occurs, T1 may be equal to T2 or T1 may be higher than T2.

Referring to the graph of FIG. 2 and the flowchart of FIG. 3 described above, a process of notifying a short circuit of the electric rice cooker according to the present invention will be described in detail.

Prior to the description, the first set time t1 and the second set time t2, which are points in time at which the temperatures of the heaters used in the present invention are respectively measured, are the range in which the heater 30 is driven, that is, the heating end time ( e) limited to. In other words, if there is no driving of the heater 30, since the temperature value detected by the temperature sensor 40 is lowered or there is no change, it can be confused with the temperature change according to the present embodiment.

When the heater 30 starts to be driven (step 100), the microcomputer 20 continuously counts time (step 101). When the counted time reaches the first set time t1, the microcomputer 20 temporarily stores the temperature value T1 detected by the temperature sensor 30 in the memory (not shown) at the first set time t1. Save (step 102).

When the elapsed time reaches the second set time t2 (step 103), the microcomputer 20 temporarily stores the temperature value T2 detected by the temperature sensor 30 in the memory at the second set time t2. Save (step 104). After storing the two different temperature values T1 and T2, the microcomputer 20 compares the measured temperatures T1 and T2 (step 106). As a result of comparison, if T1 is lower than T2, the microcomputer 20 determines that the heater 30 is in normal operation, and drives the rice cooker normally (step 108). If T1 and T2 are equal or T1 is higher than T2, the microcomputer 20 determines that the heater 30 is stopped and outputs an error signal to the buzzer 50 (step 110). When the error signal is input, the buzzer 50 sounds a buzzer sounding that the rice cooker is shorted to the outside (step 112).

The process of informing the short circuit of the rice cooker is completed through the above-described process.

As described above, the present invention compares the temperature of the heater mounted in the rice cooker over time and generates a buzzer according to the compared data, so that the user can easily determine whether the electric rice cooker is shorted. .

Claims (2)

In the rice cooker having a heater for heating food and a temperature sensor for sensing the temperature of the heater, The first temperature value T1 of the heater detected by the temperature sensor at a first set time and the second temperature value T2 of the heater are stored at a second set time, and the stored first and second temperature values are stored. A microcomputer generating an error signal when the first temperature value T1 is greater than or equal to the second temperature value T2; Electric rice cooker comprising a buzzer for generating a buzzer sound in response to the error signal. The method of claim 1, The first set time is an electric rice cooker, characterized in that the time preceding the second set time.