KR920004257B1 - Control method and device for electric pressure cooker - Google Patents

Abstract

A first reset section (108) detects an abnormally low voltage when the voltage is lower than a pre-set voltage. A second reset section (109) which detects an abnormally high voltage outputs its output signals to both a microprocessor (101) and a reset terminal (R). A temperature detecting section (103) detects low, medium and high temperatures, and outputs its output signals to a temperature detection input terminal (G2). A trigger synchronization signal generating section (110) outputs its output signals to both an input voltage discriminating terminal (G1) and a synchronization input terminal (1No). The apparatus eliminates user errors.

Description

Electric pressure cooker control method and device

1 is a circuit diagram of the present invention.

2A to 2D are flowcharts for explaining the present invention.

3 is a flowchart of a cold check subroutine.

4 is a flowchart of the mesophilic check subroutine.

5 is a flowchart of a hot check subroutine.

Fig. 6 is a flowchart of the steaming indication subroutine.

7 is a flowchart of a key sound subroutine.

8 is a flowchart of a buzzer subroutine.

9 is a power input state and temperature distribution curve in white rice cooker of less than 6 servings according to the present invention.

10 is a power input state and temperature distribution curve in white rice cooker of 6 servings or more according to the present invention.

11 is a power input state and temperature distribution curve in brown rice cooking according to the present invention.

12 is a power input state and temperature distribution curve in the steaming 1 according to the present invention.

13 is a power input state and temperature distribution curve in the steaming 2 according to the present invention.

* Explanation of symbols for main parts of the drawings

101: microprocessor 102: 100V / 220V detector

103: temperature detector 104: cancel display

105: key signal and alarm output unit 106: constant voltage unit

107: clock generator 108: first reset unit

109: second reset unit 110: trigger synchronization signal generator

111: first triac control unit 112: second triac control unit

TS ₁ : Thermistor REG: Voltage Stabilizer

IC ₁ -IC ₄ : Comparator Q ₁ -Q ₄ : Transistor

TRC ₁ , TRC ₂ : Triac H ₁ , H ₂ : First and second heaters

LED ₁ -LED ₇ : Light emitting diode P: Buzzer

R ₁ -R ₂₅ : Resistor C ₁ -C ₃ : Capacitor

SW ₁ : Inner pot detection switch SW ₂ : White rice cooking selection switch

SW ₃ : Canceling switch SW ₄ : Brown rice cooking selection switch

SW ₅ : Steam Selector

The present invention relates to a method and a device for controlling an electric pressure cooker, and in particular, a method for controlling an electric pressure cooker for controlling the sequence of heating the electric pressure cooker according to its heating time and temperature check through a program of a microprocessor and To the device.

Conventional pressure cookers can cook rice more deliciously than ordinary rice cookers, but compared to general rice cookers, not only thickens the pressure cooker to withstand the internal pressure, but also when cooking, especially when the rice is almost cooked. In the rice cooker, the internal temperature rises more rapidly than the general rice cooker. Therefore, if the pressure cooker such as an electric rice cooker to install the inner pot and check the temperature inside the inner pot by using a temperature control device of a conventional electric rice cooker to control the heating of the electric heater as described above the thickness of the inner pot In addition to thickening to withstand the internal pressure of the inner pot, the temperature rise in the inner pot occurs more rapidly than the general electric rice cooker when the rice is almost cooked. Corresponding to), it is not properly sensed, and the heating of the electric heater is not properly controlled, so the rice is not cooked properly. Due to this situation, the pressure cooker has not been put into practical use as an electric pressure cooker.

Accordingly, the present invention has been made in view of the above-described conventional problems, and to provide a method and apparatus for controlling an electric pressure cooker having the advantages of an electric rice cooker which is convenient for a user to use while having the advantages of a pressure cooker. .

Another object of the present invention is to provide a control apparatus for an electric pressure cooker in which a mode suitable for a corresponding function is automatically executed in sequence according to a function selection program of a user, and a control method thereof.

Still another object of the present invention is to provide a control device for an electric pressure cooker and a control method thereof in which the overall operation state of the rice cooker and the optimum rice taste maintaining time for checking a predetermined time after completion of the rice are known to the user with a sound and a display lamp. To provide.

Features of the present invention include the steps of: detecting a 100V / 220V AC input voltage and recognizing the input voltage state in a microprocessor; Providing a reset signal to the microprocessor at the time of low power supply voltage and abnormally high temperature of the rice cooker, and means thereof: Determining the presence of the inner pot and detecting the set temperature in the program according to the selection of each cooking mode, Providing a signal and means for causing the next processor to execute a sequence of programs; Using a trigger signal synchronized with an input power supply voltage, causing a plurality of triacs for driving a plurality of heaters to selectively trigger one or all of the triacs at zero cross point in accordance with an AC input voltage state; and Means; A step and means for causing the microprocessor to execute a corresponding program before the program execution by means of a key signal, an alarm and a light emitting diode; There is provided a control method and apparatus for an automatic electric pressure cooker.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, in the constant voltage unit 106, the AC input voltage is full-wave rectified through the voltage drop transformer T ₁ to the diodes D ₁ and D ₂ and the capacitor C ₁ so that the Vcc voltage is The Vcc voltage is further connected via the voltage stabilizer REG, the Vcc voltage is connected, and the light emitting diode LED ₂ is connected to the Vcc voltage output terminal to detect whether a power supply voltage is applied.

The microprocessor 101 is a one-chip microprocessor COP 420L manufactured by National Corporation. The sound output of the 17th terminal SO is connected to the key signal and the alarm output unit 105.

The key signal and the alarm output unit 105 is connected to the collector side of the buzzer (P) and the resistor (R ₁₁ ) is connected to the base of the transistor (Q ₁ ) connected in parallel to the input signal through the resistor (R ₁₂ ) Configure.

No. 28 terminal (D _o), the resistance (R ₁₀₎ and the light emitting diode by connecting the clear display unit 104 including the (LED _1), the terminal (D _o) from the low level output of the microprocessor 101 When the light emitting diode (LED ₁ ) is conducted to the V _DD voltage is configured to emit light.

This terminal D _O is a low active terminal.

9, 10, 21, and 24 terminals 1N ₁ , 1N ₂ , G _o , and G_ of the microprocessor 101 have ground levels through respective switches SW ₄ , SW ₅ , SW ₂ , and SW ₃ . Connect as authorized.

Here, the switch SW ₄ is a brown rice cooking selector switch, the switch SW ₅ is a steaming 1 and steaming 2 selecting switch, the switch SW ₂ is a nuclear rice cooking selecting switch, and the switch SW ₃ is an electric It is a cancellation switch for correcting the pressure cooker cooking selection mode, and the terminals 1N ₁ , 1N ₂ , G _o , and G ₃ are low active terminals.

Terminal 22 (G ₁ ) and terminal 23 (G ₂ ) of the microprocessor 101 are connected to each other so that the output of the 100V / 220V detector 102 and the output of the temperature detector 103 are applied.

The 100V / 220V detector 102 has a Vcc voltage divided by the resistors R ₁ and R ₂ and a V _DD voltage divided by the resistors R ₃ and R ₄ as the non-inverting input terminal of the comparator IC ₁ . It is configured to be connected to each of the butting particle terminals to be compared and output.

The temperature detector 103 includes a voltage V _DD divided by resistors R ₆ and R ₇ or resistors R ₆ and R ₈ or resistors R ₆ and R ₉ , and resistors R ₅ and thermistor TS. The V _DD voltage divided by the resistance value of ₁ ) is input to the non-inverting input terminal and the inverting input terminal of the comparator (IC ₂ ), respectively, to be configured to be compared and output.

Here, the non-inverting input terminal voltage of the comparator (IC ₂ ) is an optional low level output at terminals 27, 26, and 25 of the microprocessor 101 (D ₁ , D ₂ , D ₃ ). It is determined by the V _DD voltage distribution value by the resistor R ₆ of any one of the resistors R ₇ , R ₈ , and R ₉ selected according to the description of the operation).

The terminals D ₁ -D ₃ are low active terminals.

The thermistor TS ₁ is a negative resistance element, and both ends of the thermistor TS ₁ connect an inner pot presence / absence switch SW ₁ that is opened as a rain when the inner pot is placed in an electric pressure cooker in parallel. Place it.

)에는 제1, 2리세트부(108, 109)의 출력이 오어링되어 입력되게 연결한다.4th reset terminal of the microprocessor 101 (

) Is connected to the output of the first and second reset units 108 and 109 to be input.

The first reset unit 108 has a non-inverting input terminal of the comparator IC _{3 in} which the V _DD voltage divided by the resistors R ₁₅ and R ₁₆ and the Vcc voltage divided by the resistors R ₁₇ and R ₁₈ are equal to each other. It is composed by inputting with inverting input terminal and comparing output.

The second reset unit 109 is a resistance (R ₅₎ and sseoeo Mr (TS ₁₎ is a V _DD voltage division by V _DD voltage distributed by the resistance value and the resistance (R _19, R _20), a comparator (IC's ₄ ) The non-inverting input terminal and the inverting terminal of ₄ ) are respectively inputted and configured for comparison output.

The microprocessor 101 connects the clock generator 107 and the trigger synchronization signal generator 110 to the clock input terminal CKI and the synchronous input terminal 1N ₀ .

The clock generator 107 includes a resistor R ₁₄ and a capacitor C ₂ having a charge / discharge time constant due to a V _DD voltage.

The trigger synchronization signal generator 110 is connected to the AC input voltage is applied to the base side of the transistor Q ₂ through the capacitor C ₃ , the resistor R ₂₁ , and the zener diode Z ₁ to connect the transistor Q. ₂ ) The sync pulse is output from the collector side.

The outputs of the 15th trigger control terminal L ₆ and the 14th trigger control terminal L _{1 of} the microprocessor 101 are first and second row plates through the first and second triac control units 111 and 112, respectively. Connect to the trigger terminals of the triacs TRC ₁ and TRC ₂ for driving the heaters H ₁ and H ₂ .

And the first triac controller 11 is a resistance (R _22), a rough input signal is to be inputted toward the base of the transistor (Q _3), configured to be the V _DD voltage output from the emitter teocheuk of said transistor (Q ₃₎ .

The second triac control unit 112 is a resistance (R _24), a rough input signal is to be inputted toward the base of the transistor (Q _4), configured to be the V _DD voltage output from the emitter teocheuk of said transistor (Q ₄₎ . Each of the resistors R ₁₂ and R _{25 of} the first and second try liquid controllers 111 and 112 is a current limiting resistor.

13, 12, 8, 7, and 7 lamp control terminals L ₂ , L ₃ , L ₄ , L ₅ , and L _{6 of} the microprocessor 101 are connected to a function display unit 113 so that their respective output signals Each of the light emitting diodes (LED ₃ , LED ₄ , LED ₅ , LED ₆ , LED ₇ ) is grounded.

Referring to the control method of the present invention configured as described above and the effect on the device in detail as follows.

When the AC voltage is input to the circuit of FIG. 1, the voltage down to the voltage-enhancing transformer T ₁ is full-wave rectified and smoothed to the diodes D ₁ and D ₂ and the capacitor C ₁ , and output as a Vcc voltage. the voltage Vcc is outputted as the voltage V _DD via a further voltage regulator (REG). Here, the Vcc voltage is changed according to the input state of AC 100V or AC 220V, but the V _DD voltage always has a constant voltage level even if the AC input voltage is different.

Since the V _DD voltage is applied to each circuit unit together with the Vcc voltage, it is also applied to the power supply terminal 1N _{3 of} the microprocessor 101 so that the microprocessor 101 performs initialization.

A description of this initialization is shown in the initialization step S101 of FIG. 2A. As can be seen here, the internal RAM of the microprocessor 101 is cleared, terminal 27 (D ₁ ) and terminal 28 (D _O ) are set to low level, and terminal 25 ( D ₃ ) and 26 terminals (D ₂ ) are set to the high level, and the terminals (L ₂ -L ₇ ) and the terminals (L ₀ , L ₁ ) to which the function display unit 113 is connected are set to the low level. Terminals -24 (G ₀ -G ₃ ) are all set to high level and initialized.

Accordingly, the light emitting diode LED ₁ of the cancel display unit 104 is turned on, and the V _DD voltage divided by the resistors R ₆ and R ₇ is applied to the non-inverting terminal of the comparator IC ₂ of the temperature detector 103. do.

In addition, since terminals 22 and 23 of the microprocessor 101, G ₁ and G ₂ are set to high level, the output of the 100V / 220V detector 102 and the output of the temperature detector 103 can be sensed. Will be placed in.

In addition, since the low level is output from terminals 14 and 15 (L ₁ and L ₀ ) and terminals 13, 12, 8, 7, and 6 (L _{2 and} L ₆ ), the first and second triac controllers 111 and 112 And the function display unit 113 is placed in the operation standby state.

After the initialization step S101 is executed, in step S102, the level of the terminal 22 G ₁ of the microprocessor 101 is checked. If it is a high level, it is determined as an AC220V input in step S103. In S104), it is determined as an AC 100V input.

The 100V / 220V determination is made by the 100V / 220V detector 102. That is, in case of AC 100V input, Vcc voltage divided by resistors R ₁ and R ₂ is designed to be input to comparator IC ₁ lower than V _DD voltage divided by resistors R ₃ and R ₄ . when the resistance (R _1, R ₂₎ to the Vcc voltage resistor divider (R _3, R ₄₎ by greater than the V _DD voltage division by the comparator high and designed to be input to the (IC _1), the comparator (IC ₁ ) it is determined in an AC 100V or 220V input voltage AV to be detected at 22 times jack (G ₁₎ of the output level of the microprocessor 101.

The microprocessor 101 which has determined the AC 220V input or the AV 100V input state in step S103 or step S104 then checks the level of the terminal 24 G ₃ .

Since the terminal G ₃ is initially set at a high level, the on / off state of the cancel switch SW ₃ connected to the terminal G ₃ can be monitored.

Thus, when the user presses the cancel switch SW ₃ , the microprocessor 101 commands the execution of the sound subroutine step S106 by detecting the low level of the terminal G ₃ in step S105.

The flowchart for the sound subroutine is shown as a seventh degree.

To explain this, the timer input Tin (not shown) in the microprocessor 101 is reset (low level), and a high level is output to the 17th terminal SO. This high level output is 200ms delayed, and this time the output of the terminal SO is made low level and 200ms delayed again. After the timer input reaches 2ms in this way, it resets when 2ms is reached.

At this time, since the key signal and the transistor Q ₁ of the alarm output unit 105 are turned on at the high level output from the terminal SO, the buzzer P generates a key sound.

On the other hand, if the low level is not input to the 24th terminal G ₃ of the microprocessor 101, that is, when the user does not use or presses and releases the cancel switch SW ₃ , the microprocessor 101 The timer step S107 is executed.

In the timer step S107, various timing outputs for controlling the present system are generated. For example, time counts are performed in units of microseconds, s (seconds), M (minutes), and H (hours). In particular, the S stage includes an S ₁ signal that continuously counts only from 1 second to 10 seconds.

After execution of the timer step S107, the controller enters a routine for determining and executing a key input signal corresponding to each mode selection switch SW ₂ , SW ₄ , and SW ₅ .

First, in step S108, it is determined whether the mode selection signal by the selection switches SW ₂ , SW ₄ , and SW ₅ is input.

Here KFR is a flag, which means the key mode of the selection switch, the selection switch _{(SW 2, SW 4, SW} 5) and for the case of that one switch in not input a key signal flag as KFR = 0 (0000) When the key signal by the white rice cooking switch (SW ₂ ) is input, the flag is set to KFE = 1 (00001), and the steaming 1 key signal by the steaming switch (SW ₅ ) by the brown rice cooking switch (SW ₄ ). When the steam switch (SW ₅ ) is first pressed, it is switched to steam 1 mode, press again to steam 2 mode, and press again to switch to steam 1 mode. When the steaming 2 key signal by the steaming switch SW ₅ is input, the flag is set to KFR = 8 (1000) to execute each food cooking mode.

Again, is described go to step 108, the flag's KFR = by 0, the step (S115) Rice Rice build selection switch (SW ₂₎ from the terminal (GO) has been at a low level microprocessor 101 determines do.

If there is no operation of the switch SW ₂ , that is, if the high level state is maintained, the process goes to step S117 to determine whether the brown rice cooking selection switch SW ₄ is operated. If there is no operation of the selection switch SW ₄ , that is, if the high level is maintained at the terminal IN ₁ , the flow goes to step S119, and there is no key input signal following the operation of the steam selection switch SW ₅ . If so, return to the initial start phase.

However, if the low level is detected in step S115, it is recognized that it is a white rice cooking mode in step S116, and after outputting the key signal in the above-described sound subroutine SOUND step S121, step S102 is performed. Goes.

In addition, if it is confirmed in step S117 and step S118 that the brown rice cooking mode or the steaming mode by the step (S119) and step (S120) through the sound subroutine step (S121) to go to step (S102).

In this way, if the flag is not KFR = 0 in step S108, the process goes to step S109 to execute the white rice cooking routine shown in FIG. 2-2 when the rice cooking mode (KFR = 1).

If the rice cooking mode (KFR = 1) is not in the step (S109), it is determined whether the brown rice cooking mode (KFR = 2) in step S110, and if the KFR = 2, the brown rice cooking routine of FIG. Done.

In addition, if the KFR = 2 in the step (S110), if the key signal (IN ₂ = 0) by the steaming selection switch (SW ₅ ) in step (S111) determines whether the steaming 1 mode (KFR = 4) is correct In step S114, the steaming mode 2 is executed, or in step S113, the steaming mode 1 is executed as the routine of FIG. 2d. Even if the key signal of the steaming selection switch SW ₅ is not input in the step S111, The steaming routine shown in FIG. 2d is executed.

Next, the white rice cooking mode will be described with reference to FIGS. 1 and 2-2.

Steps S201, S202, S212, S216, S220, S223, and S225 of FIG. 2-2 all represent respective execution modes for the white rice cooking mode in the microprocessor 101 of FIG.

In the first running mode (MOD = 0) if the step (S203) in the step (S201), and outputs the high level to sixth terminal (L _6).

Accordingly, the light emitting diode LED ₇ for displaying the white rice cooking mode is turned on.

Thereafter, the low temperature check subroutine (LTF) of the next step (S204) is executed to check the low temperature of the electric pressure cooker.

The cold check subroutine (LTF) is shown in FIG.

In this case, first, terminal 27 (D ₁ ) of the microprocessor 101 is set to the low level, and terminals 26 and 25 (D ₂ and D ₃ ) are set to the high level, and then the level of terminal 23 (G ₂ ) is checked. do.

Therefore, the voltage V _DD divided by the resistance values of the resistor R ₅ and the thermistor S ₁ is applied to the inverting terminal of the comparator IC ₂ of the temperature detector 103, and the non-inverting of the comparator IC ₂ is applied. Since the voltage V _DD divided by the resistor R ₆ and the resistor R ₇ is applied to the terminal, the comparison value becomes the output of the temperature detector 103.

In this case, since the resistance R ₇ is set to a low temperature (90 ° C.) resistance value, the thermistor TS ₁ having a negative resistance characteristic installed outside the inner pot of the electric pressure cooker senses the temperature of the inner pot, and the temperature thereof. Reaches a 90 ° C., the high level is supplied to the terminal G ₂ of the microprocessor 101, otherwise the low level is supplied.

Therefore, when the low level output comes out in the low temperature check subroutine (LTF) step S204, in step S206 it is checked whether the timer has exceeded 15 minutes, and if it is exceeded, it is determined as an error, and again from the initialization step S101 of FIG. 2a. To start.

However, if the determination result timer in step S206 does not exceed 15 minutes, go to step S122 of FIG. 2A to determine the AC input voltage state, and execute step S124 at 100V and step S123 at 220V. ).

In step S124, the high level is output from the terminals L ₀ and L ₁ of the microprocessor 101, and in step S123, the high level is output only from the terminal L ₁ of the microprocessor 101, thereby generating a heater ( H ₁ ) and / or (H ₂ ) drive triac (TRC ₁ ) and / or (TRC ₂ ) are controlled by triac control 111 and / or 112.

At this time, the high level output from the terminal L ₀ and / or the terminal L ₁ is a kind of pulse output substantially synchronized to the synchronization signal after the generation of the trigger synchronization signal 110 and understands the ease of triggering at the zero cross point. Is designed to trigger triacs (TRC ₁ , TRC ₂ ).

In addition, the first and second heaters H ₁ and H ₂ allow the first and second heaters H ₁ and H ₂ to be heated at 1200 W / H in parallel when 100 V is input and at the 220 V input, the second heater ( only by the H ₂₎ to be heated to 1200W / H and determines the capacity of each to be heated to 1200W / H only by the second heater (H ₂₎ when 220V input.

Meanwhile, when the temperature of the inner pot reaches the set low temperature (900 ° C.) in step 2204 of FIG. 2-2, the key signal and the buzzer output part of FIG. 1 are passed through the sound subroutine step S205 described above. In step S207, the timer in the microprocessor 101 is reset and the next internal execution mode is designated (MOD ← MOD + 1), followed by the path described so far from step S102. A second internal run mode step 202 is executed. The second internal run mode (MOD = 1) is the middle temperature check mode.

Referring first to the middle temperature check subroutine (MTP) step, the low level is output from terminal 26 (D ₂ ) of the microprocessor 101, and thus V _DD decomposition according to the resistors R ₆ and R ₈ is performed. The temperature detector 103 is configured based on the voltage. In this case, the resistance R ₈ is determined as a resistance value for the temperature detector 103 to detect the medium temperature (l15 ° C.).

Therefore, if a state that has not yet reached the middle temperature (l15 ° C) is detected in step S208, as described above, the routine after step S122 of FIG. 2a is executed, and the temperature of the inner pot reaches the middle temperature (l15 ° C). If the time required to check is checked in step S209, and the temperature does not reach the medium temperature within the set time (T = 340S), the amount of rice is determined to be 6 servings or more in step S210, and when the temperature reaches the medium temperature within the set time, step S211 In step (2), the routine after step S205 is executed.

In the next third internal execution mode (MOD = 2), in step S212, the high temperature check subroutine (HTP) step S213 is executed.

In the step S213, as shown in FIG. 5, since the low level is output only to terminal 25 D ₃ of the microprocessor 101, the temperature detector 103 is determined by the value of the resistor R ₉ . The high temperature (135 ° C.) is detected and provided to the terminal G ₂ .

Here, when high temperature (135 ° C) is detected by thermistor TS ₁ of the temperature detector 103, the routine after step S205 is executed in step S213, but before reaching the high temperature (135 ° C) In step S214, it is determined whether the portion is 6 servings or less, and if it is 6 servings or less, step S215 is executed, and if the serving is 6 servings or more, step S122 of FIG.

The terminal executes the step (S215) in the microprocessor 101, the timer of the S ₁ timing that is by using a timer that repeatedly counts from 1 second up to 10 seconds of the 3 seconds after the first step 2a degrees (S122) during a routine in the ( The first heater H ₁ and / or the second heater H ₂ are heated at the output of L _O ) and / or the terminal L ₁ , and after the step S102 of FIG. 2a for the remaining 7 seconds. A routine is executed to stop heating of the first heater H ₁ and / or the second heater H ₂ .

Thus, step S215 is heated to 3 / 10X1200W / H = 360W / H.

Next, the fourth internal execution mode (MOD = 3) will be described (S216).

In the step S216, when the high temperature is detected in the high temperature check step S213, the timer count is checked immediately after the high temperature detection in step S217, and when 4 minutes elapse, the routine after the step S205 is executed, and 4 minutes is performed. Step S218 is executed until it reaches.

In step S218, it is determined whether or not 6 servings or more (QUN = 1), and if 6 servings or less, the routine after step S102 of FIG. 2a is executed, and if 1 serving or more, S ₁ of the timer in the microprocessor 101 is served. Using the timing, the routine after step S122 of FIG. 2a is executed for 2 seconds to allow the first heater H ₁ and / or the second heater H ₂ to be heated, and the second 2a for the remaining 8 seconds. After the high level is output at the 13th terminal L ₂ of the step 101 of FIG. 101, the routine after the step S102 of FIG. 2a is executed to execute the first heater H ₁ and / or the second heater H _2. ) Heating is stopped.

Therefore, in the step (S ₂₁₉ ), the heater is described as the next fifth internal execution mode (MOD = 4) step (S220) with 2 / 10X200W / H = 240W / H.

In this case, when the count of the timer is reached in step S221 and reaches 5 minutes, the step S207 is executed to proceed to the next mode (MOD = 5). The routine after the processor S102 is executed.

Therefore, the light emitting diode LED ₃ of the function display unit 113 is turned on.

The light emitting diode (LED ₃ ) has a function of informing the user that the moxibustion is running.

Next, the sixth internal execution mode (MOD = 5) will be described (S223).

In step S223, the terminal L _2- L ₆ and the terminal D ₆ of the microprocessor 101 to which all the light emitting diodes LED _{3 to} LED ₇ of the function display unit 113 are connected in step S224. After making the outputs of all of the output levels low, so that only the light emitting diode LED ₁ of the cancel display unit 104 is turned on and the buzzer subroutine BUZZER is executed, the step S207 is performed to the next mode (MOD = 6). Run

The buzzer subroutine BUZZER is executed with the eighth degree.

First, the timer Tin in the microprocessor 101 is reset and a high level is output to the terminal SO. The high level output is delayed by 220 kHz, and then the low level is output to the terminal SO. This low-level output, or 220ms delay, repeats the routine until the timer Tin reaches 16ms.

When the timer Tin reaches 16ms, the high level is output again to the terminal SO and delayed by 180ms. This time, the low level is delayed by the terminal SO for 180ms.

By repeating the routine, Tin = 2ms, Tin = 4ms, Tin = 6ms, and Tin = 8ms are sequentially checked and reset when Tin reaches 8ms.

Accordingly, since the key signal and the transistor Q ₁ of the buzzer output unit 105 pass through the short speed, the buzzer P is driven.

Next, the seventh internal execution mode (MOO = 6) will be described (S225).

If it is not the seventh execution mode (MOD = 6) in step S225, the buzzer subroutine (S226) is executed (S226), and the routine below the step (S102) of FIG. 2A is executed, but the seventh execution mode is executed. If (MOD = 6), the timer count is checked and the routine after step S102 is executed until 30 minutes are reached. If 30 minutes are reached, the routine enters step S207 to specify the next mode and resets the internal timer. Set it. Therefore, after the seventh mode (MOD = 6), the buzzer P is driven by the execution of the buzzer subroutine step S226.

The white rice cooking mode described above is divided into six servings or less and six servings.

First, Figure 9 shows the power input state and the temperature distribution curve (a) for cooking rice of less than 6 servings, if there is a cooking mode selection signal by the switch (SW ₂ ), the light emitting diode of the cancel display unit 104 The LED ₁ is turned off, the light emitting diode LED ₇ of the function display unit 113 is turned on, and a key sound is output from the buzzer P of the key signal and the alarm output unit 105.

At this time, if the inner pot is not placed in the electric pressure cooker of the present invention, since the reset signal is provided to the fourth step R of the microprocessor 101, the apparatus of the present invention does not operate. That is, for convenience, the resistance value of the thermistor TS ₁ included in the temperature detection unit 103 has a zero resistance value by the closed state of the inner pot presence detection switch SW ₁ , so that the output of the second reset unit 109 is output. Is at the low level. This is commonly performed in various cooking modes and steaming modes which will be described below.

On the other hand, if the microprocessor 101 recognizes the rice cooking mode of 6 servings or less (this recognition is determined by checking the time when the temperature of the inner pot reaches from 90 ° C to 115 ° C. The microprocessor 101 sets the first heater H ₁ and / or the second heater H ₂ to 1200W / H according to the input voltage discrimination signal of the 100V / 220V detection unit 102, thereby increasing the temperature of the inner pot. Continuous high temperature heating until reaching a medium temperature (115 ℃). In this way, when the temperature distribution curve a reaches the middle temperature (115 ° C), when the heaters H ₁ and H ₂ reach the temperature, the heating power of the heaters H ₁ and H ₂ is reduced to 360 W / H, thereby increasing the temperature (135 ° C). Turn on low power until you get to

When the inner pot reaches a high temperature, the timer is counted according to the program of the microprocessor to stop the heating of the heater until 4 minutes and count another 5 minutes, and then the rice cooking end alarm is issued.

On the other hand, in cooking rice of 6 or more servings, the first heater H ₁ and / or the second heater H ₂ are continuous until the temperature distribution curve b of the inner pot reaches a high temperature (135 ° C.) as in the tenth degree. After the low-temperature heating with a heater power of 240W / H for 4 minutes, and the low-temperature heating step of 4 minutes is completed, the end alarm is issued after executing the 5-minute steaming step.

Next, the brown rice cooking mode will be described based on FIGS. 2-3 and 1.

In step S110, the brown rice cooking mode is recognized by the microprocessor 101 by the program execution of FIG. 2A. This recognition is based on the user pressing the brown rice cooking selection switch SW ₄ .

In the first step 301 of the internal execution mode of this microprocessor 101 for brown rice cooking, step S303 is executed to output a high level at terminal 7 (L ₅ ).

Therefore, the light-emitting diode LED ₆ for cooking rice on the function display unit 113 is turned on. After the step S303 is executed, the process enters step S204 of FIG. 2-2 and is executed by a routine as described above.

Next, in the internal execution mode (MOD = 1) step (S302), enter the step S208 of FIG. 2-2, check the medium temperature check subroutine (MTP) and the cooking quantity, and then select the next mode (MOD = 2). Run

In the next third execution mode (MOD = 2) step (S304), if the set high temperature (135 ° C) is checked by executing the high temperature check subroutine (HTP) step (S305), the routine of step S205 of FIG. If the set high temperature is not reached, the timer in the microprocessor 101 is checked in step S306 to count 5 minutes, and then in step S307, the timing signal S ₁ is used for three seconds as shown in FIG. The high temperature is checked by executing the routine following step S102.

If the next fourth internal execution mode (MOD = 3) step S308, the internal timer of the microprocessor 101 is counted in step S309, and when the time reaches 4 minutes, the routine of step S205 of FIG. Run

In the next fifth internal execution mode (MOD = 4), step S310, if the timer is counted in step S311 and reaches five minutes, the routine following step S205 of FIG. 2-2 is executed, and in five minutes If not, the routine of step S122 of FIG. 2a is executed for the first 2 seconds using the timing signal S ₁ in step S3121, and the routine of step S102 of FIG. 2a of the second FIG. Is performed for the remaining 8 seconds. Run

When the next sixth internal execution mode (MOD = 5) is confirmed in step S313, the timer is counted in step S314, and when it reaches 15 minutes, the routine of step S205 of FIG. 2-2 is executed. Before reaching 15 minutes, step S315 is executed to output a high level to the terminal L ₂ of the microprocessor 101, and the routine below the waiting step S102 of FIG. 2A is executed.

Therefore, at this time, the light emitting diode (LED ₃ ) for displaying the moxibustion process of the function display unit 113 is turned on.

When the next seventh internal execution mode (MOD = 6) step S316 is confirmed, the step B224 of FIG. 2-2 is driven to drive the buzzer and all the light emitting diodes (LED ₃ -LED) of the function display unit 113 are performed. ₇ ) is turned off, and then the routine of step S207 and below is executed.

When the next eighth internal execution mode (MOD = 7) step S317 is confirmed, the routine below the step S227 of FIG. 2-2 is executed, and if the eighth internal execution mode (MOS = 7) is not the second step; The routine below the step S226 of -2 degrees is executed.

Brown rice cooking mode executed by the above-described sequence operation is shown in FIG.

Referring to this, the brown rice cooking step is summarized, initially, when the inner pot is heated to the maximum heater supply power (1200W / H), when the temperature of the inner pot reaches the set temperature (115 ℃), the heating is stopped for 5 minutes.

Since the input power of the heater is lowered to 360W / H is supplied, the temperature distribution curve (C) is generally maintained near the middle temperature, and reaches a set high temperature (135 ℃) of the inner pot after a certain time. Here the heating of the heater is stopped. Thereafter, the power supplied to the heater is lowered to 240W / H and further supplied for 5 minutes, and after 5 minutes, the power is again performed in a moxibustion step for 15 minutes while the power supply is stopped again. When the execution of the moxibustion step is finished, the end alarm is issued to inform the user that the brown rice is finished.

Next, the steaming mode will be described based on FIG. 2D and FIG. 1.

When the microprocessor 101 recognizes that the steaming mode is selected in steps S111, S114, and S113 of FIG. 2A, the steaming 1 or the steaming 2 mode is executed by executing the routine as shown in FIG. 2D.

The steaming mode selection recognition in the microprocessor 101 may be recognized based on the user pressing the steaming selection switch SW ₅ .

If the first internal execution mode (MOD = 0) by this steaming selection is confirmed in step S401, the steaming subroutine CHI is executed in step S402. A flowchart for the steaming subroutine CHI is shown in FIG. To explain this, if the steam 1 selection plug (KFR) is KFR = 4 (0100), the high level is output only at terminal 12 (L ₃ ) of the microprocessor 101, and if the steam 2 selection flag is not KFR = 4, that is, When KFR = 8 (1000), the high level is output only at the eighth terminal L ₄ of the microprocessor 101.

Therefore, the light emitting diode LED ₄ of the function display unit 113 is turned on in the steaming 1 mode, and the light emitting diode LED ₅ is turned on in the steaming 2 mode.

Since the above-described selection of the steaming 1 mode and the steaming 2 mode is performed by the routine below the step S111 of FIG. 2A, a detailed description thereof will be omitted.

When the steam 1 or steam 2 mode is determined in step S402, the routine after step S204, which is the low temperature check subroutine (LTF) of FIG. 2-2, is executed.

If the next second internal execution mode (MOD = 1) is confirmed in step S403, in step S404, the steam division subroutine CHI is executed, and then the routine of step S208 of FIG. 2-2 is executed. .

If the next third internal execution mode (MOD = 2) is confirmed in step S405, the routine of following the step S205 of FIG. 2-2 is executed after executing the steaming subroutine CHI in step S406 as well. do.

If the next fourth internal execution mode (MOD = 3) is confirmed in step S407, if the time of the internal timer is counted in step S408 and 2 minutes have not elapsed, the routine of step S102 of FIG. 2A or less is executed. Then, the time (2 minutes) check is continued, and when the above 2 minutes is reached, it is checked whether the steaming mode 1 (KFR = 4) is reached in step S409.

Here, if the steaming 1 mode (KFR = 4), run the step (S410) to check the 15-minute timer, if not steaming 1 mode, that is, if the steaming 2 mode (KFR = 8), run the step (S411) 25 minutes timer Check it.

If it is checked that each time set in the step S410 or step S411 is reached, the routine following step S205 of FIG. 2-2 is executed.

However, if the respective set time is not reached in step S410 or step S411, the high temperature check subroutine HTP is executed in step S412.

Here, if the actual high temperature (135 ° C.) is checked, the routine of step S205 of FIG. 2-2 is executed. If the set high temperature is not reached, the S ₁ timing (10) of the internal timer of the microprocessor 101 is reached. By using the herbivore time repetition), in step S413, power is supplied to the heater for the first 4 seconds and the heater power is cut off for the remaining 6 seconds to generate an average power of 480 W / H.

That is, the first four seconds in step S413 executes the routine below step S122 of FIG. 2A, and the wait routine of step S102 below FIG. 2A of FIG. 2A is executed for the remaining 6 seconds.

If the next fifth internal execution mode (MOD = 4) is checked in step S414, the time count of the internal timer is checked in step S415, and the number 13 terminal L of the microprocessor 101 is reached before reaching 5 minutes. _After outputting the high level in ₂ ), the routine below step S102 of FIG. 2a is executed, and if it is checked that 5 minutes has been reached, the routine of step S207 of FIG. 2-2 is executed.

Therefore, the moxibustion display light emitting diode LED ₃ of the function display unit 113 is turned on for 5 minutes, so that the user is informed that the moxibustion is in progress.

If the next sixth internal execution mode (MOD = 5) is checked in step S417, the routine below step S224 of FIG. 2-2 is executed, and the internal execution mode checked in step S417 is executed sixth. If the mode is not in the low-temperature check subroutine (LTP) of step S418 is executed.

Here, if the low temperature (90 ° C) or more is checked, the routine below step S102 of FIG. 2A is executed, and if the low temperature or less is checked, the routine below step S122 of FIG. 2A is executed. It will be kept at a constant temperature (90 ℃).

The temperature distribution curves (d, e) and the power input state for the set time or the temperature check according to the progress of the steaming 1 and steaming 2 modes are well illustrated in FIGS. 12 and 13, respectively.

As described above, the present invention, since 100V or 220V AC input voltage of the electric pressure cooker is automatically sensed internally and stably provided to a plurality of heaters, it is possible to prevent breakage of the electric pressure cooker due to a user mistake. In addition, since the heater heating plate is always heated at a constant power to any input voltage, and the supply of heater power is cut off under the input voltage below the set voltage, cooking is always performed under uniform conditions. The effect of being completely excluded is shown.

In addition, according to a user program, ie, a key input signal such as rice or brown rice cooking or steaming mode selection switch, the microprocessor sequentially executes its own program for the corresponding mode based on the internal temperature condition and internal timing of the rice cooker. It also detects itself on the basis of the heating time of the heater reaching the set temperature for cooking or steaming, and then executes a program suitable for the amount, so that it is possible to fully automate cooking.

In addition, the present invention can be known through the key signal, the buzzer and the display lamp to the user program input state and the entire process of the operation of the mode, it is possible to eliminate the malfunction due to the user operation miss.

Claims (8)

In an electric pressure cooker control device using a microprocessor. Inner pot by abnormal high temperature and inner pot detection switch SW ₁ by the first reset unit 108 and thermistor TS ₁ for detecting the set input voltage below from the Vcc voltage and V _DD of the constant voltage unit 106 The output of the second reset unit 109 for detecting absence is commonly connected to the reset terminal R of the microprocessor 101, and the output of the temperature detector 103 for sequentially detecting low, medium and high temperatures is provided. The output is connected to the corresponding temperature detection input terminal (G ₂ ), and the low-active key signal input terminals (G ₀ , G ₃ , 1N ₁ , 1N ₂ ) are respectively prepared with white rice cooking selector switch (SW ₂ ) and cancel. Connect the ground level by the switch SW ₃ , the brown rice cooking selection switch SW ₄ , and the steaming selection switch SW ₅ , and output the low level when the key signal is input by the cancellation switch SW ₃ . To the cancel output terminal (D ₀ ) is connected to the cancel display unit 104, by comparing the Vcc voltage and V _DD voltage 10 The output of the 100V / 220V detector 102 for detecting the 0V / 220V input voltage and the output of the trigger sync signal generator 110 are respectively applied to the input voltage determination terminal G ₁ and the synchronization input terminal 1N ₀ . The output of the trigger terminals L ₀ and L ₁ to selectively output a control signal of zero cross point based on the input signal to the input voltage determination terminal G ₁ and the synchronization input terminal 1N ₀ . It is connected to the first and second triac (TRC ₁ , TRC ₂ ) control first and second triac control unit (111, 112) connected to the first and second heaters (H ₁ , H _{2, respectively} ) to be applied as a trigger signal, The sound output terminal SO and the lamp output terminals L _{2 to} L ₆ which output high levels according to the key input of the mode selection switch SW ₂ , SW ₄ and SW ₅ are respectively a key signal and an alarm output unit 105. ) And the control device of the electric pressure cooker, characterized in that configured to connect the function display unit 113. The method of claim 1, wherein the temperature estimation unit 103, a temperature detection terminal (G ₂₎ terminals that sequentially output a low level according to the temperature detection signal of the comparator (IC ₂₎ provided in the (D ₁ -D ₃₎ Low and medium temperature by thermistor TS ₁ by connecting the V _DD divider voltage between any one of the resistors R ₇ -R ₉ connected to the resistor R _{6 to} the reference voltage of the comparator IC ₂ . , The high pressure detection signal is output from the comparator (IC ₂ ) characterized in that the control device of the electric pressure cooker. 3. The control apparatus of an electric pressure cooker according to claim 1 or 2, wherein the thermistor (TS ₁ ) is installed outside the inner pot for accurate temperature detection. An electric pressure cooker control method using a microprocessor, the method comprising: initializing a microprocessor in a low active state; Selecting, by the microprocessor, the first heater and / or the second heater according to the 100V / 220V detection signal; Checking the cancel keystroke and setting an internal timer; White rice cooking mode, brown rice cooking mode and steaming 1, 2 modes can be checked sequentially to execute rice rice cooking mode, brown rice cooking mode, steaming 1 mode and steaming 2 mode, but in rice cooking mode, heater heating plate Determining the small amount of cooking and the large amount of cooking by checking whether it reaches the set temperature from the set low temperature to the set medium temperature within a predetermined time, and in the small amount cooking mode, the maximum supply power of the heater heating plate at medium temperature is determined. After turning on the power of 3/10, the power supply is cut off when it reaches a high temperature and steamed for 9 minutes.In the mass cooking mode, the maximum supply power is input to the heater heating plate from the beginning and then the maximum supply power is reached when the temperature is reached. After 2/10 of additional power for 4 minutes, perform the next 5 minutes of steaming. In the brown rice cooking mode, the heater heating plate is heated to medium temperature at maximum supply power. Cutting off the power supply for 5 minutes, and then turning on 3/10 of the maximum supply power to heat up to a high temperature, and then shutting off the power supply for 4 minutes, and then further 5 minutes at 2/10 power of the maximum supply power. Heating and steaming for 15 minutes, in the steaming mode, heating the heater heating plate to the middle temperature at the maximum power supply and shutting off the power supply for 2 minutes, and then steaming 1 mode of 4/10 of the maximum power supply Control method of electric pressure cooker which is heated for 15 minutes with electric power and performs steaming step for 5 minutes, and if steaming 2 mode, heating for 25 minutes with power of 4/10 of the maximum supply power and performing steaming step for 5 minutes. 5. The control method according to claim 4, wherein the low temperature is set at 90 ° C, the medium temperature is 115 ° C, and the high temperature is 135 ° C. 5. The control method of an electric pressure cooker according to claim 4, wherein the input power of the heater heating plate is controlled using a 10-second repetition timing S ₁ inside the microprocessor. 5. The electric apparatus according to claim 4, wherein the first and second heaters are controlled at the AV 100V input and the second heaters are controlled by the trigger signal of the microprocessor synchronized to the zero cross point at the AC 220V input. Control method of pressure cooker. 8. The method of claim 7, wherein the capacity of the first and second heaters is set such that the sum of the heating powers by the first and second heaters when the AC 100V is input and the heating power by the second heaters when the AC 220V input is the same power. Control method of electric pressure cooker characterized in that.

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