KR101031787B1 - Apparatus for controlling overheating proctection of electric cooktop and method thereof - Google Patents

Abstract

In order to protect the control assembly from indirect heat generated from the heater, the present invention protects the control assembly by embedding a temperature sensor inside the control assembly and at the same time prevents overheating of the burner. It is to provide an overheat prevention control device and a control method of the electric cooktop which is provided with a monitoring circuit so that the product life time according to the On / Off is easy to understand the product replacement cycle.

The technical configuration includes a burner assembly driven at a constant temperature and time; A control assembly configured to receive and control an exothermic temperature or an exothermic time of the burner assembly; And a first temperature sensor built into the control assembly to prevent damage to the control assembly due to indirect heat of the burner assembly.

Electric Cooktop, Self Diagnosis, Overtemperature Protection, Circuit Protection, Double Protection

Description

Overheat prevention control device and control method of electric cooktop {APPARATUS FOR CONTROLLING OVERHEATING PROCTECTION OF ELECTRIC COOKTOP AND METHOD THEREOF}

The present invention relates to an overheat prevention control apparatus and a control method for an electric cooktop, and to an overheat prevention control apparatus and a control method for controlling a heat quantity of a heater and self-diagnosing the presence of a sensor to display a corresponding error state. It is about.

In general, an electronic electric cooktop is a device for cooking food by transferring heat to an upper portion of a heat source through a heat source that uses electricity as an energy source to generate heat.

In this case, a highlight heater, a coil-type radiant heater and a halogen heater are used as the heat source, and the upper end of the heater is covered with ceramic glass having high heat resistance for safety.

In addition, the heating element is a radiant type that is commonly used, and a current is applied to the heating wire of the heater to emit high-temperature radiant heat by self-heating of the heating wire. At this time, the radiated heat is transferred directly to the cooking vessel and cooking is performed.

1 is an exploded perspective view schematically showing a general electric cooktop. As shown in the figure, the electric cooktop 100 according to the prior art comprises a main body 110, a plurality of burner assembly 120, the power supply 130, the control assembly 140 and the top plate 150 do.

In addition, the main body 110 forms an exterior of the electric cooktop 100 and provides a predetermined space for mounting the burner assembly 120, the power supply 130, and the control assembly 140.

In addition, the control assembly 140 is provided with a built-in temperature sensor, serves to control the KEY input, temperature data input and heater output, the control assembly 140 is the respective burner assembly by the user's operation Configured to perform operation control of 120.

In addition, each burner assembly 120 is provided in the front space and the rear space in each of the main body, and serves to cook food while generating heat by power supply, wherein the heat source of the burner radiant heater or Any one of the induction heaters may be selectively used.

Here, the general burner control method stops cooking by cutting off the power supply to the burner immediately when the cooking temperature is detected above the set temperature, but after cutting off the power supply to the heater of the burner during cooking, There is a high level of heat.

Therefore, when the user does not recognize the residual heat of the burner or does not pay attention to the top plate, a safety accident such as a burn may occur, and since the self-diagnosis is not performed, the self-diagnosis is not performed. There is a problem that is difficult to diagnose the various errors occurred internally.

That is, if the temperature of the burner is sensed above the set temperature, the power supply to the burner is cut off immediately or the power is supplied to the minimum voltage, which causes the burner temperature to drop sharply, resulting in longer cooking time or incomplete cooking.

In addition, in controlling the heater for each thermal power during the heating of the heat of the burner, the power supply is controlled by the on average time by the on / off method. When doing so, there is a problem that may cause a fire and a user's risk due to the unintentional heating of the heater due to the failure and malfunction of the contacts.

In addition, the residual heat is present in the heater at the time of power failure and the end of operation during use, and if the user does not notice the residual heat of the burner or if the user touches the top plate without paying attention, a safety accident such as a burn may occur. There was this.

The present invention has been made to solve the above problems, in order to protect the control assembly from the indirect heat generated from the heater, by embedding a temperature sensor inside the control assembly to protect the control assembly and at the same time prevent overheating of the burner. An object of the present invention is to provide an overheat prevention control device and a control method of an electric cooktop.

Another object of the present invention, in the power supply for controlling the heat of the heater, it is easy to know the product replacement cycle by having a monitoring circuit to know the product life time according to the On / Off of the relay for constant temperature control It is to provide an overheat prevention control device and a control method of the electric cooktop.

Another object of the present invention is to provide an overheat prevention control apparatus and control method for an electric cooktop that can prevent a user from a safety accident in advance by using a bimetallic temperature controller to output a residual heat signal of a heater to a user. It is.

In order to achieve the above object, the present invention provides a burner assembly driven at a constant temperature and time; A control assembly configured to receive and control an exothermic temperature or an exothermic time of the burner assembly; And a first temperature sensor built into the control assembly to prevent damage to the control assembly due to indirect heat of the burner assembly.

Preferably, the first temperature sensor is characterized in that the burner assembly is spaced in an oblique direction in order to prevent damage due to direct heat of the burner assembly.

Preferably, the second temperature sensor is provided to measure the temperature of each burner assembly to prevent overheating of each burner assembly; It characterized in that it further comprises.

Preferably, the second temperature sensor is characterized in that it is provided to display the residual heat due to the heat output from the burner assembly when no power is applied to the control assembly and the burner assembly.

Preferably, the control assembly includes a first load driver for driving a load of the burner assembly; A second load driver configured to control on / off of the burner assembly to control heat quantity constantly; A load monitoring unit provided to prevent damage to the first load driving unit and the second load driving unit; Characterized in that it comprises a.

Preferably, the first load driver is characterized in that it is made to prevent a malfunction by generating a PWM signal.

Preferably, the second load driver is characterized in that it is provided to drive a relay that is turned on / off, in order to maintain the temperature of the burner assembly at a set temperature.

A first step of sensing temperature in a first temperature sensor for measuring indirect heat transferred from the burner assembly driven at a constant temperature and time to the control assembly; A second step of determining, by the indirect heat detected by the first temperature sensor, a short circuit or opening of the first temperature sensor based on a temperature according to an output level of the burner assembly; A third step of adjusting the temperature of each burner assembly when the temperature is not a short circuit or opening of the first temperature sensor, when the temperature of the burner assembly is greater than or equal to a predetermined temperature that causes damage to the control assembly by the indirect heat detected by the respective burner assemblies; It includes.

Preferably, the third step may include: generating a PWM output signal to a first load driver for preventing a malfunction of the first temperature sensor when an abnormal operation of the control assembly is performed; It characterized in that it further comprises.

Advantageously, said third step further comprises reading and sensing logic in a direct or indirect manner such that said burner assembly maintains a constant temperature; It characterized in that it further comprises.

Preferably, the direct or indirect method is characterized in that the method using a voltage detection or photo coupler.

Preferably, the third step includes driving a relay to stop the burner assembly if the read data is abnormal, and outputting an error message to the display unit so that the user can know it; It characterized in that it further comprises.

Preferably, in the third step, when the temperature sensed by the first temperature sensor is equal to or greater than the first set temperature, the calorie reduction control is performed such that the temperature of each burner assembly approaches the first set temperature.

Preferably, the third step may include: outputting, to a user, an operation state indicating that a safety mode for high temperature has been entered, when the temperature sensed by the first temperature sensor is equal to or greater than a first set temperature; It characterized in that it further comprises.

Preferably, the third step may include: shutting off power applied to each burner assembly and outputting an error message to a user when the temperature sensed by the first temperature sensor is greater than or equal to a second set temperature; It characterized in that it further comprises.

Preferably, the step of outputting a warning text when the temperature detected by the second temperature sensor for detecting the temperature of the upper surface of the burner assembly is above a predetermined temperature; It characterized in that it further comprises.

Preferably, the step is characterized in that when the power is not applied to the control assembly and the burner assembly in order to display the residual heat due to the heat output from the burner assembly.

As described above, the present invention having the configuration as described above can prevent damage to the control assembly due to indirect heat of the heater by embedding a temperature sensor in the control assembly, thereby reducing the occurrence rate of failure due to indirect heat. Also, it is easy to know the on / off relay product replacement cycle that maintains a constant temperature in the heater, and it is possible to prevent the safety accident by outputting the residual heat signal to the user. have.

The present invention is a built-in temperature sensor in the control assembly so as to be spaced apart from the heater in a diagonal direction, it is made to prevent damage to the control assembly due to indirect heat of the heater by using a temperature sensor, a relay for maintaining a constant temperature in the heater By providing a circuit for monitoring the contact point of the contact, it is possible to know the product life and the replacement cycle according to the contact point of the relay and at the same time to know whether the relay is faulty, by using the temperature sensor installed in the control assembly It is made to prevent user's safety accident from indirect heat.

That is, in order to maintain the proper temperature of the burner assembly and to determine whether there is an abnormality of the product, the driver monitoring circuit and the temperature sensor provided in each burner and the temperature sensor of the control assembly are used. Outputs a signal, reads logic through the monitoring circuit of the drive unit before supplying power to the burner assembly, and if the read data is abnormal, stops the power supply to the burner, displays an error message and is embedded in the control assembly. If the temperature of the temperature sensor is higher than the first set temperature, the heat quantity of the heater is reduced, and if the temperature is higher than the second set temperature, the heater is turned off and an error message is displayed. If the temperature is above a certain temperature includes the step of outputting a character as a warning sign for the hot.

Hereinafter, with reference to the accompanying drawings, an embodiment according to the present invention will be described in detail.

Figure 2 is an exploded perspective view schematically showing an electric cooktop with a built-in electric cooktop overheat prevention control device according to the present invention. As shown in the drawings, the electric cooktop 1 according to the present invention comprises a main body 10, a plurality of burner assembly 20, the power supply unit 30, the control assembly 40 and the top plate 50 do.

In addition, the main body 10 forms an exterior of the electric cooktop 1 and provides a predetermined space for mounting the burner assembly 20, the power supply unit 30, and the control assembly 40.

In addition, the control assembly 40 is provided with a built-in temperature sensor, serves to control the KEY input, temperature data input and heater output, the control assembly 40 is the respective burner assembly by the user's operation Configured to perform operation control of 20.

In addition, each burner assembly 20 is provided in each of the front space and the rear space in each of the main body, and serves to cook food while generating heat by power supply, wherein the heat source of the burner radiant heater or Any one of the induction heaters may be selectively used.

Here, one end of the power supply unit 30 is exposed to the outside of the bottom of the main body 10, the other end of the power supply unit 30 is coupled to be exposed to the inside of the main body 10 is supplied with external power. .

In addition, external power is supplied to the burner assembly 20 and the control assembly 40 to supply power, and the control assembly 40 controls the operation of each burner assembly 20 by a user's manipulation. Is done.

In addition, the top plate 50 is configured to block the space formed by the main body 10 from the outside, and is formed of tempered glass such as ceramic glass, so that various cooking vessels correspond to the mounting position of each burner assembly 20. The upper surface of the burner is formed to be placed.

In addition, each burner assembly 20 has a temperature sensor for sensing a cooking temperature which is the surface temperature of each burner heated by a corresponding coil, and a temperature sensor for protecting a control circuit which is a component of the control assembly 40. It is provided.

Temperature sensor according to the present invention is to prevent the safety accidents due to the residual heat and high temperature of each burner, each burner is provided to maintain a constant temperature due to the user's operation, the control circuit itself as a component of the control assembly 40 Built-in temperature sensor to protect the made to prevent damage to the control assembly 40 at the same time as the user.

Figure 3 is a schematic view showing a circuit diagram according to the electric cooktop overheat prevention control apparatus according to the present invention. As shown in the figure, the control assembly 40 comprises a means for controlling and monitoring the amount of heat of each burner, outputting it to a user, and a control means capable of controlling it.

When the microcomputer 47 receives a PWM (Pulse Width Modulation), which is a square wave, it passes through a capacitor connected in series and reaches the point "D", and the signal is placed in a low state, and a 12V constant voltage is formed by driving the PNP-type transistor. .

In addition, when the load driver 42 receives an output signal from the microcomputer 47, a 0 V power is formed by driving the transistor, and the heater can be driven by a contact on by driving the relay 44.

Here, the failure of the microcomputer 47 occurs, and the output of the high or low is formed, and the contact point of the relay 44 is ON because the input signal at the point "D" is always maintained "HIGH" which is 12V. Therefore, no power is applied to the heater.

Therefore, the logic is read out through the monitoring circuit of the load driver 42 before supplying power to the heater, and when the heater is turned on like the circuit shown in the load monitoring unit 43 and the load unit, the microcomputer ( &Quot; HIGH " input to the microcomputer 47 at " LOW " input to the microcomputer 47 when the heater is turned off is processed as a normal signal.

In this case, when the opposite signal of the above signal is input, it is determined that the relay is broken or the wire of the wire is broken. The output of the heater is immediately turned off and an error message is displayed.

In addition, the first temperature sensor 48a is installed inside the printed circuit board in case the PCB of the control assembly 40 is damaged by indirect heat by each burner. When sensing the heat to the extent that the printed circuit board disturbs or damages the operation, the relay 44 is driven to turn off the burner.

In addition, the first temperature sensor 48a is configured to detect indirect heat of each burner to prevent damage to the printed circuit board and to detect an overheat state of each burner.

In addition, the first temperature sensor 48a is installed on the printed circuit board of the control assembly 40, but is installed in a diagonal direction instead of being installed in a linear direction so as not to receive direct heat from each burner, thereby receiving in a linear direction. It is made to eliminate the cause of failure due to heat.

In addition, the second temperature sensor 48b may be provided as a bi-metal temperature controller provided by a heater, and the signal of the second temperature sensor 48b may indicate whether there is residual heat in each burner. When the signal of the second temperature sensor 48b is generated, “H” is output to the display unit 60 to inform the user that the top plate 50 is hot, thereby preventing a safety accident.

In addition, the load driver 41 is driven according to Table 1 below.

division A B C D E F Normal signal Square wave (Vin) Square wave (1/2 Vout) Smooth voltage (1 / 2V) Low (0V) HIGH (12V) LOW (0V) Abnormal signal (HIGH) Smooth voltage (Low) (Low) High (12V) Low (0V) Low (0V) Abnormal signal (LOW) Smooth voltage (Low) (Low) High (12V) Low (0V) Low (0V) Abnormal Signal (OPEN) (Open) (Low) (Low) High (12V) Low (0V) Low (0V)

Figure 4 is a plan view schematically showing a display unit of the overheat prevention control apparatus of the electric cooktop according to the present invention. As shown in the figure, the display unit 60 is configured to start or end the operation of the system using the power key 61b.

Here, the power key 61b is made to be applied to the power supply when the key input is more than 3 seconds to prevent the operation of the child, when the power is turned off using the power key 61b LED ( Drive 61a).

The lock key 62a is locked as soon as an input is applied to the touch pad. When the lock key 62a is released, the lock key 62a is inputted to the touch pad for at least 3 seconds to be released. With

In addition, the first crater (63b) and the second crater (64b) for receiving a key input to select which burner of each burner is provided, and is configured to correspond one-to-one to each burner, each time the key of each burner is pressed Powell levels may be entered.

That is, when the first press is applied, the seven-stage fire power is applied, and after that, the cycle increases in the order of 7-> 8-> 9-> 1-> 2-> 3-> 4-> 5-> 6 .. And 7-segments 63a and 64a are provided to indicate the selected power level.

In addition, the selection of the power level can also be set by the up / down keys 68 and 69, and the power level represented by the 7-segments 63a and 64a prevents a safety accident caused by the residual heat of each burner to the user after stopping operation. Output 『H』 to do this.

When the cooking time is set, the timer key 65b may be set in units of 1 minute, and may be set up to 90 minutes, and the time may be set by the up / down keys 68 and 69.

Here, in the safety mode 67, when a temperature higher than the temperature set by the first temperature sensor 48a is sensed, in order to prevent overheating, when the temperature of the temperature is maintained by lowering the currently operating power below the level. Is made to continue driving.

For example, when operating at 9-stage thermal power, if the temperature detected by the temperature sensor has risen to 70 ℃, it is possible to operate by lowering the thermal power level to 6-stage, and the abnormal temperature is detected at the temperature sensor or at the drive unit. If a voltage occurs, display it first.

In addition, when the user is using the electric cooktop (1), the user is aware that the temperature is high, so the high temperature display is not performed. Do it.

5 is a flowchart schematically illustrating a method for controlling overheating of an electric cooktop according to the present invention. As shown in the figure, the first step (S10) of detecting the temperature in the first temperature sensor for measuring the indirect heat transferred to the control assembly from the burner assembly driven at a constant temperature and time, in the first temperature sensor In the case where the detected indirect heat is not the short circuit or the opening of the first temperature sensor and the second step S20 of determining the short circuit or the opening of the first temperature sensor based on the temperature according to the output level of the burner assembly, And a third step S30 of adjusting the temperature of each burner assembly when the temperature of the burner assembly is greater than or equal to a predetermined temperature at which the control assembly is damaged by the indirect heat sensed by each burner assembly.

The third step S30 may further include generating a PWM output signal to the first load driver for preventing a malfunction of the first temperature sensor when an abnormal operation of the control assembly is performed.

In addition, the third step S30 may further include reading and sensing logic in a direct or indirect manner so that the burner assembly maintains a constant temperature, and the direct or indirect method may be performed using voltage detection or a photo coupler. It is characterized by the manner.

In addition, if the read data is abnormal, the relay is driven to stop the burner assembly, and an error message is output to the display unit for the user to know, and if the temperature detected by the first temperature sensor is equal to or greater than the first set temperature, The calorie reduction control is performed such that the temperature of the burner assembly approaches the first set temperature.

In addition, when the temperature detected by the first temperature sensor is greater than or equal to the first set temperature, an operation state indicating that the safety mode for high temperature has been entered is displayed to the user, and the temperature detected by the first temperature sensor is 2 If the set temperature is over, cut off the power applied to each burner assembly and output error message to the user.

When the temperature detected by the second temperature sensor sensing the temperature of the upper surface of the burner assembly is a predetermined temperature or more, a warning letter is output. In order to display the residual heat due to the heat output from the burner assembly, Characterized in that the power is not applied.

In the above described exemplary embodiments of the present invention by way of example, the scope of the present invention is not limited to this specific embodiment, and those skilled in the art within the scope described in the claims of the present invention Changes may be made as appropriate.

1 is an exploded perspective view schematically showing a general electric cooktop;

2 is an exploded perspective view schematically showing the electric cooktop according to the present invention.

3 is a circuit diagram schematically showing an electric cooktop control device according to the present invention.

Figure 4 is a plan view schematically showing a display unit according to the overheat prevention control device of the electric cooktop of the present invention.

5 is a flow chart schematically showing a method for controlling overheating of an electric cooktop according to the present invention.

<Brief description of reference numerals for the main parts of the drawings>

1: electric cooktop

20: burner assembly 30: power supply

40: control assembly 41: first load drive unit

42: second load driver 43: load monitor

44: relay 45: overheat protector

47: microcomputer 48a: first temperature sensor

48b: second temperature sensor 49a: DC power supply circuit

50: upper panel, KEY input unit 60: display unit

70: alarm generating unit

Claims (19)

A burner assembly 20 driven at a constant temperature and time; A control assembly 40 configured to receive and control an exothermic temperature or an exothermic time of the burner assembly 20; And, In order to prevent damage to the control assembly 40 due to indirect heat of the burner assembly 20, the first temperature sensor 48a which is built in the control assembly 40, The control assembly 40, A first load driver for driving a load of the burner assembly 20; A second load driver configured to control on / off of the burner assembly 20 to constantly control the amount of heat; And, And a load monitoring unit (43) provided to prevent damage to the first load driving unit and the second load driving unit. The method according to claim 1, The first temperature sensor 48a is provided to be spaced apart in an oblique direction from the burner assembly 20 in order to prevent damage due to direct heat of the burner assembly 20. Device. The method according to claim 2, A second temperature sensor (48b) provided to measure the temperature of each burner assembly (20) to prevent overheating of each burner assembly (20); Overheat prevention control device for an electric cooktop, characterized in that it further comprises. The method of claim 3, The second temperature sensor 48b is provided to display residual heat due to heat output from the burner assembly 20 when power is not applied to the control assembly 40 and the burner assembly 20. Overheat prevention control device of the electric cooktop. delete The method according to claim 1, The first load driving unit generates a PWM signal to prevent the malfunction of the electric cooktop, characterized in that made to prevent malfunction. The method according to claim 6, The second load driving unit is provided to drive the relay (44) on / off, in order to maintain the temperature of the burner assembly (20) at a set temperature, overheat prevention control device of the electric cooktop. A first step of sensing temperature in a first temperature sensor 48a for measuring indirect heat transferred from the burner assembly 20 driven to a constant temperature and time to the control assembly 40; A second step of determining whether the indirect heat detected by the first temperature sensor 48a is short or open of the first temperature sensor 48a based on a temperature according to the output level of the burner assembly 20; When the first temperature sensor 48a is not shorted or opened, the burner assembly 20 when the temperature is greater than or equal to a predetermined temperature at which the control assembly 40 is damaged by indirect heat detected by the burner assemblies 20. Adjusting the temperature of c); Overheat prevention control method of the electric cooktop comprising a. The method according to claim 8, The third step is Generating a PWM output signal to a first load driver for preventing a malfunction of the first temperature sensor 48a when an abnormal operation of the control assembly 40 is performed; Overheat prevention control method of the electric cooktop, characterized in that it further comprises. The method according to claim 9, The third step is Reading and sensing logic in a direct or indirect manner such that the burner assembly 20 maintains a constant temperature; Overheat prevention control method of the electric cooktop, characterized in that it further comprises. The method according to claim 10, The direct or indirect method is an overheat prevention control method of an electric cooktop, characterized in that the method using a voltage detection or photo coupler. The method of claim 11, The third step is Driving the relay 44 to stop the burner assembly 20 if the read data is abnormal, and outputting an error message to the display unit 60 for the user to know; Overheat prevention control method of the electric cooktop, characterized in that it further comprises. The method according to claim 12, The third step is When the temperature sensed by the first temperature sensor 48a is equal to or greater than the first set temperature, the calorie reduction control is performed such that the temperature of each burner assembly 20 approaches the first set temperature. Prevention control method. 14. The method of claim 13, The third step is If the temperature sensed by the first temperature sensor 48a is equal to or greater than a first set temperature, outputting an operation state indicating to the user that the safety mode for high temperature has been entered; Overheat prevention control method of the electric cooktop, characterized in that it further comprises. 14. The method of claim 13, The third step is If the temperature sensed by the first temperature sensor 48a is greater than or equal to a second set temperature, shutting off power applied to each burner assembly 20 and outputting an error message to a user; Overheat prevention control method of the electric cooktop, characterized in that it further comprises. 16. The method of claim 15, Outputting a warning text when the temperature detected by the second temperature sensor 48b sensing the temperature of the upper surface of the burner assembly 20 is greater than or equal to a predetermined temperature; Overheat prevention control method of the electric cooktop, characterized in that it further comprises. 18. The method of claim 16, The step of performing overheating of the electric cooktop, characterized in that when the power is not applied to the control assembly 40 and the burner assembly 20 in order to display the residual heat due to the heat output from the burner assembly 20. Prevention control method. The method according to claim 17, The first set temperature is 70 ℃ overheat prevention control method of the electric cooktop, characterized in that. 19. The method of claim 18, The second set temperature is 90 ° C overheat prevention control method, characterized in that the electric cooktop.

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