KR0141794B1 - Control method and apparatus for electronics industing heating rice cooker - Google Patents

Abstract

The present invention relates to a cooking control method and apparatus for an electromagnetic induction heating rice cooker, which continuously detects a momentary power failure state during a cooking process or a warming process, and if a power failure occurs, the current temperature of the rice cooker is detected to be below a predetermined temperature. If the process is canceled and the set temperature is higher or the power outage is less than the predetermined time, the process before the power failure is performed to prevent the rice from being unripe or cooked due to immature insulation.

The present invention as described above is a step of searching whether the current induction heating cooker is in progress of the cooking process or the warming process, and if the search result or the cooking process or the warming process, the step of determining the presence or absence of momentary power failure through the electrostatic detection means, If the instantaneous power outage is searched for the instantaneous power outage time to detect the internal temperature of the current cooker, and if the internal temperature is below the set temperature, cancel the cooking or warming process and the temperature is above the set temperature or the power failure time If the predetermined time or less, it is achieved by the step of performing the process before the electrostatic.

Description

Cooking control method and device of electromagnetic induction heating rice cooker

1 is a system configuration of the cooking control device of the present invention induction heating rice cooker.

2 is a signal flow diagram for the operation description of FIG.

** Explanation of symbols for main parts of drawings **

100: rectifying part 101: smoothing part

102: inverter unit 103: inverter control unit

104: switching driver 105: current detector

106: negative feedback amplifier 107: integrator

108: power failure detection unit 109: power supply unit

110: metal fan 111: key control unit

112: system control unit 113: fan drive unit

114: cooling fan

The present invention relates to the cooking control of the electromagnetic induction heating rice cooker, and more specifically, if a momentary power failure occurs during the cooking process or the warming process, the current temperature of the cooker is sensed if the temperature is below a predetermined temperature, and the process before the power failure is canceled. The present invention relates to a cooking control method and apparatus of an electromagnetic induction heating rice cooker to prevent rice frying and hoarseness caused by uncooked rice or heat insulation immature by performing a process before electrostatic discharge.

In general, in order to perform the cooking process with an electric rice cooker, put the rice soaked in the water in the container and supply the appropriate amount of water according to the number of servings and then press the cooked rice, the lower part to absorb the water of the rice initially The heater and the side heater are heated to 120 ° C. and 100 ° C., respectively, to perform the cooking process.

In this way, when the cooking process is performed, the temperature sensing elements installed at the bottom and the side of the rice cooker detect the lower temperature and the side temperature in the container, and when the temperature reaches the set temperature, the cooking process is stopped and the heating value of the lower heater and the side heater is lowered to perform the steaming process. Be sure to

After the moxibustion process is completed, the upper heater is heated to about 70 ° C. according to the user's choice to perform the warming process.

In order to perform the cooking process with the electromagnetic induction heating rice cooker, the user puts rice into the metal pan of the rice cooker, adjusts the amount of water according to the serving amount, and then presses the cooking key to perform the soaking process at the beginning. The working coil and the metal fan of the inverter means, which are heaters, generate heat at 58 ° C. required for the soaking process due to the thermal effect and perform the soaking process.

Thereafter, when the soaking process is completed, the cooking process, which is the next process, is performed to heat the metal pan to 120 ° C. required for the cooking process.

After the cooking process is completed, the cooking is completed by adjusting the temperature to the moxibustion process and the heat insulation process.

However, if a power failure occurs momentarily while cooking is being performed in such a general electric rice cooker and an electromagnetic induction heating rice cooker or during a warming process, and then supplied again after a certain time, the temperature inside the rice cooker is maintained to a certain degree. Despite having to perform the process of electrostatic discharge in the state, such a rice cooker was to perform the process of electrostatic discharge at all regardless of the internal temperature of the rice cooker.

Therefore, if a power failure occurs during cooking in the rice cooker, when the rice is uncooked due to lack of the heating temperature during the blackout time or reheating at a low temperature, or when the power is turned on again after power failure occurs during warming, Since the temperature is kept warm again, there was a problem that the rice floated and hoarse.

Therefore, the object of the present invention, in view of the conventional problems, such as during the cooking process or warming process continuously detects a momentary power failure state if the power failure occurs if the current temperature of the rice cooker below a certain temperature if the process of the power failure The method and apparatus for cooking rice of an electromagnetic induction heating cooker to prevent the cooking and cooking of rice caused by uncooked rice or unheated rice by performing the process before the blackout when the temperature is higher than the set temperature or the occurrence of the power failure is less than the predetermined time. In providing.

Such a method for achieving the object of the present invention includes the steps of searching whether the current electromagnetic induction heating cooker proceeds to the cooking process or the warming process, and if the search result is the cooking process or the warming process instantaneous through the electrostatic detection means Determining whether there is a power outage, if the instantaneous power failure, search the instantaneous power failure time and detect the internal temperature of the current cooker after a certain time, cancel the cooking or warming process if the internal temperature is less than the set temperature; When the temperature is above the set temperature or the power failure time is less than a predetermined time is achieved by the step of performing the process before the power failure.

Still another means for achieving the object of the present invention, the electrostatic detection means for determining whether or not the generation of the oscillation frequency of 60Hz according to the power supply from the power supply means, and the oscillation of 60Hz from the electrostatic detection means System control to control the whole system operation of the electromagnetic induction heating cooker to determine whether there is a power failure according to the frequency input and to cancel or perform the cooking process or the warming process according to the determined outage time and the internal temperature of the cooker obtained by the temperature sensing means. It is achieved by the configuration including the means, and will be described in detail below with reference to the accompanying drawings of the present invention.

1 is a system configuration diagram of the cooking control device of the electromagnetic induction heating rice cooker of the present invention. As shown in FIG. 1, the key control unit 111 for selecting and inputting the cooking function, the warming function, and various cooking times is provided. The upper heater 116 is installed in the upper portion and is heated in the warm mode to maintain the heat at a constant temperature, and is installed in the circumferential shape on the inner side of the rice cooker and selectively heats together with the upper heater 116 in the warm mode The side heater 118 to keep warm at a predetermined temperature, the metal fan 110 is seated between the side heater 118, and is installed in the lower portion of the rice cooker circumferentially by the electromagnetic induction effect 110 The working coil 102a, which is a lower heater for heating the upper and side surfaces of the rice cooker to measure the upper and side temperature of the inside of the rice cooker, the side temperature sensing members 120 and 122, and the lower portion of the rice cooker. niche Position temperature sensing member 123 for detecting the lower temperature and the respective temperature signals detected by the upper temperature sensing member 120, side temperature sensing member 122 and the lower temperature sensing member 123 as a digital signal First, second, and third analog / digital conversion units 119, 121, and 124 to be converted; a cooling fan 114 positioned at a lower portion of the rice cooker to cool the inside of the rice cooker; and an input AC power source. A power supply unit 109 for rectifying the voltage by dropping AC to a predetermined level, an electrostatic detection unit 108 for generating a square wave pulse of 60 Hz depending on whether power is supplied from the power supply unit 109, and the power supply unit Operated by the voltage generated from 109, the current temperature change value converted by the first to third analog / digital converters 119, 121, and 124 and the key signal of the key operator 111 And the electromagnetic induction according to the presence or absence of a square wave pulse input of 60 Hz generated by the electrostatic detection unit 108. The system controller 112 controls the overall system operation of the heat cooker, the rectifier 100 rectifies the input AC power source AC with a pulsating DC voltage, and the pulsating DC voltage rectified by the rectifier 100 is choked. The smoothing unit 101 to smoothly smooth the coil L1 and the condenser C1 and the voltage output from the smoothing unit 101 according to the pulse width modulation signal input from the outside are resonated by the resonance voltage. The working coil 102a for inducing vortices in the metal fan 110 to be heated by the electromagnetic induction effect due to the generated magnetic field to heat the food in the metal pan 100 to a desired heating temperature, and the working coil 102a and a series thereof. The pulse width modulation signal is generated in accordance with the inverter unit 102 including the resonant capacitor C2, the damping diode D1, and the switching element Q1 constituting the resonant circuit, and the resonant voltage generated by the inverter unit 102. Inverter control unit 103 and the inverter A switching driver 104 for controlling the switching element Q1 of the inverter unit 102 according to the pulse width modulation signal generated by the control unit 103, and a current for detecting the input current as a voltage in the input AC power source AC. A negative feedback for comparing the voltage level detected by the detector 105 and the current detector 105 with a reference level value set and input for each function from the system controller 112 and outputting a comparison deviation value. Integrating the amplification unit 106 and the comparison deviation value of the negative feedback amplifier 106 to control the output pulse width modulation signal of the inverter control unit 103 according to the integral value to switch the switching element through the switching driver 104 An integrator 107 that determines the on / off time of Q1 and an upper heater driver 115 that generates the upper heater 116 and the side heater 118 by the control signal output from the system controller 112. And the side heater driving unit 117 and the system control unit 112. It is composed of a display unit 125, which by the control signals to display various functional states of an electromagnetic induction heating cooker, a fan driving part 113 that drives a cooling fan 114 by the control signal from the system controller 112. The

In the above, the inverter controller 103 detects the resonance voltage generated by the inverter unit 102 and determines a triangle wave generation time, and the triangle wave generator by the voltage detected by the voltage detector 103a. A triangle wave is generated at 103b1 and the generated triangle wave and the voltage integrated at the integrator 107 are compared through the comparing unit 103b2, and the switching element Q1 of the inverter unit 102 is turned on according to the comparison result. A pulse width modulated signal generator 103b for generating a pulse width modulated signal for deciding on / off time is shown. In the drawing, reference numeral D2 denotes a diode, R1 denotes a resistance, and 130 denotes a temperature sensing means.

In addition, the electrostatic detection unit 108 receives the 60 Hz power from the power supply unit 109 to charge and discharge and divide the capacitor (C3) and resistors (R2-R5) and the switching according to the divided voltage And a switching element Q2 for inputting the voltage of the power supply terminal Vcc through the resistor R6 to the system control unit 112 with a square wave of 60 Hz.

And, Figure 2 is a signal flow diagram for the operation description of Figure 1, as shown in the step (S1) for searching whether the electromagnetic induction heating cooker is currently in the cooking process, and the search results the current cooking process If not, the step S2 of retrieving whether the key is input from the key operation unit 111, and if the key is input from the key operation unit 111, analyzes the progress time of each mode and the electromagnetic induction heating rice cooker. In step (S4) (S9) to proceed to the general for cooking and to determine the current cooking row, and if there is no key input from the key operation unit 111 as a result of the search in the step (S2) current electromagnetic induction heating If it is not insulated by searching whether the cooker is performing the warming process, the process time and general matters of the respective modes are carried out (S3) (S9), and the searched in the step (S1) (S3). As a result of the current cooking or warming step (S5) (S7) to search for a momentary power outage through the power failure detection unit 108, and if the result of the instantaneous power failure if the cooking or warming process ( S6) (S8), and if the result of the search in the step (S5) (S7) is a momentary power failure, counting the momentary power failure time (S10), and searching whether the counted momentary power failure time has passed a predetermined time (S11) and when the momentary power failure has passed a predetermined time step (S12) to measure and compare the current temperature of the cooker with the set temperature, and the result of the comparison or more than the set temperature (50 ℃) or a predetermined time If it is not elapsed, the step (S13) of proceeding the process state before the blackout and the result of the comparison in the step (S12) and if the current temperature of the cooker is less than the set temperature is made of the step of canceling the cooking or warming step (S14) .

If described in detail with reference to Figures 1 and 2 the effect of the present invention configured as follows.

First, the input AC power source AC is rectified to the pulsating DC voltage through the rectifying unit 100, and then smoothed through the choke coil L1 and the capacitor C1 of the peace unit 101, and the AC power source AC. The voltage is lowered to a predetermined level through the transformer of the power supply unit 109 and input to the electrostatic detection unit 108, and is converted into a constant voltage of a predetermined level through the bridge diode and the zener diode and applied to the operating voltage of the system controller 112. do.

The pulsating DC voltage smoothed by the smoothing unit 101 is input to the inverter unit 102.

At this time, after the user supplies the rice and the appropriate amount of water to the metal pan 110 in the rice cooker and selects and presses the cooking mode key through the key operation unit 111, the system control unit 112 displays the cooking function through the display unit 125. In addition to displaying and zooming, soaking process, cooking process, and pause / moxibustion process are performed.

That is, when the cooking mode key is selected from the key control unit 111, the system control unit 112 operates by the voltage input from the power supply unit 109, and initially through the fan drive unit 113 to the lower place of the rice cooker. The cooling fan 114 is placed for a predetermined time to maintain the internal temperature of the cooker in parallel with the external temperature.

Thereafter, when a predetermined time elapses, an internal timer is operated to input a reference voltage level value, for example, 58 ° C., appropriate for the soaking process to the negative feedback amplifier 106 for the set time, and to the display unit 125. The soaking process will be displayed.

Meanwhile, the base current of the inverter unit 102 to the switching element Q1 corresponds to the pulse width modulation control signal derived from the pulse width modulation signal generation unit 103b of the inverter control unit 103. Since the driving coil 102a and the resonant capacitor C2 are continuously driven by the pulsating DC voltage input from the smoothing unit 101, the driving coil 102a and the resonant capacitor C2 are driven.

Accordingly, a large resonance current flows through the working coil 102a.

As a result, eddy currents are induced in the metal fan 110 to be heated due to the electromagnetic induction effect due to the magnetic field generated from the working coil 102a. As a result, the metal fan 110 is heated and the food in the metal fan 110 is heated. It is heated to the desired heating temperature.

At this time, the resonant voltage generated by the working coil 102a and the resonant capacitor C2 of the inverter unit 102 is detected by the voltage detecting unit 103a of the inverter control unit 103 so that the pulse width modulated signal generator 103b The triangle wave generator 103b1 is controlled to determine the triangle wave generation point.

The triangular wave generator 103b1 generates a triangular wave signal for determining conduction and cutoff time of the switching element Q1 of the inverter unit 102 according to the voltage detected by the voltage detector 103a. It is input to the inverting terminal (-).

Meanwhile, when the current detector 105 detects an input current from an input AC power source AC and inputs the inverting terminal of the negative feedback amplifier 106, the negative feedback amplifier 106 is detected by the current detector 105. The comparison deviation value is input to the integrator 107 in comparison with the reference voltage level of the temperature (58 ° C.) corresponding to the soaking process of the system controller 112 driven by the voltage level and the drive voltage of the power supply unit 109. Done.

The integrator 107 integrates the input comparison deviation value to determine the conduction time of the switching element Q1 of the inverter unit 102. The non-inverting terminal of the comparison unit 103b2 via the diode D2 is integrated. Will be entered in +).

Accordingly, the comparison unit 103b2 compares the triangular wave pulse of the triangular wave generation unit 103b1 with the integral value of the integrator 107 to determine the conduction and cutoff time of the switching element Q1 of the inverter unit 102. By inputting and driving the modulated signal to the switching driver 104, the switching element Q1 of the inverter unit 102 is turned on and off to effectively drive the working coil 102a to heat food in the metal fan 110. The soaking process is performed.

As described above, the system control unit 112 performing the soaking process by heating the metal fan 110 by the working coil 102a of the inverter unit 102 has a lower temperature sensing member 123 installed under the metal fan 110. ) And the third analog / digital converter 124 to measure the current temperature of the metal fan 110 and compare it with the set soak temperature.

At this time, if the lower temperature measured by the lower temperature sensing member 123 does not reach the set soak temperature, the duty ratio of the conduction and shutdown time of the switching element Q1 configured in the inverter unit 102 is maximized. It is input to the feedback amplifier 106.

Accordingly, as described above, the negative feedback amplifier 106 compares the voltage level detected by the current detector 105 with the duty ratio value of the switching element Q1 input by the system controller 112, and compares the deviation. The value is entered into the integrator 107.

The integrator 107 integrates the input comparison deviation value to determine the conduction time of the switching element Q1 of the inverter unit 102. The non-inverting terminal of the comparison unit 103b2 via the diode D2 is integrated. Will be entered in +).

Accordingly, the comparison unit 103b2 compares the triangular wave pulse of the triangular wave generation unit 103b1 with the integral value of the integrator 107 to determine the conduction and cutoff time of the switching element Q1 of the inverter unit 102. By inputting and driving the modulated signal to the switching driver 104, the switching element Q1 of the inverter unit 102 is turned on and shut off, thereby driving the working coil 102a to the maximum to heat the metal fan 110. .

When the lower temperature of the metal fan 110 reaches the set soak temperature, it is determined that the soaking process is completed and the switching element Q1 of the inverter unit 102 is blocked to stop the operation of the working coil 102a. do.

When the so called process is completed as described above, the system control unit 112 performs the cooking process.

That is, in the cooking process, since the temperature of the metal fan 110 should be heated to a temperature (110 ° C.) required for cooking, the system control unit 112 conducts and cuts off time of the switching element Q1 configured in the inverter unit 102. The switching element Q1 is constant through the negative feedback amplifier 106 and the integrator 107, the diode D1, the resistor R1, the inverter controller 103, and the switching driver 104 to maximize the duty ratio of the circuit. It conducts for a time and cuts off for a predetermined time to maximize the heating of the metal fan 110 through the working coil 102a.

As a result, the internal temperature of the metal fan 110 is gradually increased, and water is cut off. As time passes, water vapor is evaporated and cooking is performed.

As such, the system control unit 112 performs the lower temperature sensing member 123 and the third analog / digital conversion during the cooking process while heating the metal fan 110 through the working coil 102a of the inverter unit 102. The lower temperature of the metal fan 110 is continuously measured through the unit 124 and compared with the set cooking temperature.

If the lower temperature does not reach the set cooking temperature as a result of the comparison, it is heated with full power until the cooking temperature is reached, and when the lower temperature of the metal pan 110 reaches the cooking temperature, the cooking process After completion of the moxibustion process to the next step.

In the moxibustion step, first, when the lower temperature of the metal pan 110 reaches the cooking temperature, the duty ratio is set to 0 level, and the working coil 102a of the working coil 102a is turned on through the switching element Q1 of the inverter unit 102. The operation is paused for a certain time.

At this time, even if the working coil 102a is paused for a certain time, the moxibustion is made by the residual heat in the metal fan 110 during that time.

Then, after a certain time elapses, since the heat in the metal fan 110 is lowered again, the system controller 112 increases the duty slightly to maintain the heat when the battery is idle. The process of conducting and interrupting Q1) is repeated and continuously to end the moxibustion process.

When the moxibustion process is completed, the upper heater 116 and the side heater 118 are periodically heated through the upper heater driving unit 115 and the side heater driving unit 117 to heat the 70 ° C to 80 ° C necessary for keeping warm. Keep warm while maintaining.

As such, in order to cope with the instantaneous power failure in the electromagnetic induction heating rice cooker which performs the soaking process, the cooking process, the moxibustion process, and the thermal insulation process, the system control unit 112, as shown in FIG. The key operation unit 111 searches whether the cooking process is in progress. (Step S1)

As a result of the search, if the current process is not in progress, it is searched whether another mode key is input from the key operation unit 111. (Step; S2)

If another mode key (for example, cooking mode, warming mode, soaking mode, etc.) from the key control unit 111 is inputted, this is analyzed and the progress time of each mode is determined. In the process, the moxibustion process and the soaking process, we will judge the current drinking behavior. (Step; S4, S9)

And, if there is no key input from the key operation unit 111 to search whether the current induction heating rice cooker is in progress (step; S3), if not in progress, proceed with the progress time and general details of each mode Try to determine the current drinking behavior. (Step; S9)

Then, if the result of the search in the step (S1) (S3) is currently cooking or keeping warm, it is searched whether the momentary power failure through the electrostatic detection unit 108.

That is, in case of instantaneous power failure detection, when 60 Hz power from the power supply unit 109 is input, the capacitor C3 of the electrostatic detection unit 108 continuously charges and discharges the input 60 Hz power to generate the resistors R2 and R3. The voltage is divided through and the divided 60Hz power supply is divided again through the resistors R4 and R5 to periodically turn on / off the switching element Q2.

When the switching element Q2 is periodically turned on / off, the voltage of the power supply terminal Vcc is input to the system controller 112 with a square wave of 60 Hz through the resistor R6.

The system controller 112 determines the instantaneous power failure according to the presence or absence of a square wave input of 60 Hz from the power failure detector 108 (steps S5 and S7).

That is, if the result of the determination in the step (S5) (S7) is not a momentary power failure, that is, when a square wave of 60 Hz is input from the electrostatic detection unit 108, the cooking process or the warming process continues. (Step S6, S8)

If the result of the determination in step S5 and S7 is a momentary power failure, that is, a square wave of 60 Hz is not input from the electrostatic discharge unit 108, the time of the power failure is counted. (Step; S10)

Then, it is searched whether the counted instantaneous power failure time has elapsed for a predetermined time (about 4 hours) (step S11).

As a result of the search, if a predetermined time (about 4 hours) has elapsed, it is searched whether the internal temperature of the current cooker is above a predetermined temperature (50 ° C.) (step S12).

As a result of the search, if the internal temperature of the current cooker is lower than the set temperature, cancel the cooking process or the warming process that is currently in progress (step S14), to prevent unripe or frying of the rice, and search in the step S11 (S12). As a result, if the momentary power failure does not pass a certain time or if the current temperature of the rice cooker is above a certain temperature, the cooking and warming process of the blackout is continued because there is no effect on cooking and warming. (Step; S13)

As described in detail above, according to the present invention continuously detects a momentary power failure state during the cooking process or the warming process, if a power failure occurs, if the current temperature of the cooker is sensed below a certain temperature, cancel the process before the power failure and set temperature When abnormal or instantaneous blackout is less than or equal to a predetermined time, by performing the process before the blackout, there is an effect of preventing the cooking of the rice caused by uncooked rice or heat insulation immature.

Claims (6)

Step (S1, S3) for searching whether the cooking process or the warming process of the electromagnetic induction heating cooker is in progress, and if the cooking process or the warming process as a result of the search to determine the presence or absence of a momentary power failure through the detection unit 108 Step (S5, S7), and if the instantaneous power outage to search the instantaneous power outage time and detect the internal temperature of the current cooker when a certain time passes (S12), if the internal temperature is less than the set temperature cooking or warming process Canceling the cooking temperature control method of the electromagnetic induction heating rice cooker characterized in that the step (S14, S13) is carried out before the set temperature or the power failure time is less than a predetermined time. The method of claim 1, wherein the instantaneous blackout time is based on 4 hours. The method of claim 1, wherein the internal temperature of the rice cooker during blackout is based on 50 ° C. The presence or absence of power failure according to the presence or absence of power failure detection means 108 for determining whether a square wave pulse of 60 Hz is generated according to the presence or absence of a commercial power supply obtained by voltage drop to a predetermined level, System control means 112 for controlling the overall system operation of the electromagnetic induction heating rice cooker to determine or cancel or perform the cooking process or the warming process according to the determined outage time and the internal temperature of the cooker obtained through the temperature sensing means 130 The cooking control device of the electromagnetic induction heating rice cooker comprising a. The power supply detecting unit 108 of claim 4, wherein the power failure detecting unit 108 is switched according to the capacitor C3 and the resistor R2-R5 to charge and discharge the commercial power and divide the divided power according to the divided voltage. A cooking control apparatus for an electromagnetic induction heating rice cooker, comprising a switching element (Q1) input to the system control means (112) by a square wave pulse of 60 Hz. The method of claim 4, wherein the temperature sensing means 130 is composed of an upper temperature sensing member 120, a side temperature sensing member 122 and a lower temperature sensing member 123 for sensing the upper, side and lower temperatures, respectively. Cook control device of electric induction heating rice cooker.