JPH10286174A - Electric rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a rice cooking error at the time of timer reservation rice cooking by utilizing a voltage applied to a timer motor and supplying a charge voltage to a memory capacitor for rice cooking at the time of the timer reservation rice cooking setting of a motor timer for supplying power to a rice cooking heater after the lapse of set time. SOLUTION: At the time of cooking rice, when a rice cooking switch is pressed, energizing is performed from a power supply input line through a terminal (a) and electric charges are charged to the capacitor for a rice cooking memory. Then, in the case that an input voltage is higher than a reference voltage, the output of a comparator for the rice cooking memory becomes at an H level, and when the output of the comparator for rice cooking temperature judgement is at the H level, the rice cooking heater H1 is energized and the rice cooking is started. Also, when the setting operation of the timer reservation rice cooking is performed, the voltage from a timer motor ON contact point terminal (c) voltage-divided by voltage dividing resistors R4 and R5 is charged to the capacitor for the rice cooking memory through a charge power supply line Lc provided with a diode D1 for rectification.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rice cooker having a timer rice cooking function.

[0002]

2. Description of the Related Art At present, a rice cooker control function via a microcomputer or an electronic circuit type control unit by operating a rice cooker switch and a timer switch O using a motor timer.
An electric rice cooker that uses a rice cooking control function based on N is provided.

FIG. 5 shows a configuration of a conventional example of a rice cooking circuit of this type of electric rice cooker. 5, reference numeral H ₁ is cooking heater, RL relay coil of cooking relays, RS relay switches the cooking relays, H ₂ is kept heater, TRC triac for controlling heat retaining heater, PL ₁ is cooking lamp,
PL ₂ is a heating lamp, TLR is a motor timer unit, M is a timer motor of a motor timer TLR, TS
Is a timer switch of the motor timer unit TLR, PL ₃ is a timer lamp, R ₁ and R ₂ are resistors, 20 is a control unit for controlling a rice cooking heater, SW ₁ is a rice cooking switch, SW ₂ is a warming switch, and 7 is a rice cooker A center sensor at the bottom, S ₁ is a thermistor for detecting the temperature of the rice cooker provided in the center sensor 7, and S ₂ is a reed switch for detecting the set of the rice cooker also provided in the center sensor 7, each of which is illustrated. And connected to the commercial power supply AC100 (V) via the temperature fuse F.

In the configuration shown in FIG. 5, the timer switch TS of the motor timer unit TLR includes a power OFF contact terminal A, a power ON contact terminal B, and a timer motor ON contact terminal C, as shown in FIG. When the timer motor M is turned ON by turning the movable contact piece from the power OFF contact terminal A side to the timer motor ON contact terminal C with a dial knob (not shown), the timer motor M It rotates in proportion to the frequency, and the timer operation starts.

When the timer motor M rotates a predetermined number of times for a set time determined according to the amount of rotation of the dial knob at that time, the movable piece of the timer switch TS moves from the timer motor ON contact terminal C to turn on the power supply. close contact terminal B, the power source AC to the cooking heater H ₁
100 (V) is supplied to start cooking rice at a reserved time.

[0006]

However, in the above-described configuration, once the timer is set, the power supply to the control unit 20 is cut off thereafter, so the rice cooker switch is pressed after the timer is set. However, the rice cook function cannot be stored in the rice cook memory capacitor in the control unit 20. Therefore, subsequent motor timer is not supplied power to the stove, heater H ₁ even became a time up to rice scheduled time, there has been a problem that results in a rice miss that rice does not cook.

The present invention has been made in order to solve such a problem. A charge power supply line capable of supplying a charge voltage to a rice cook memory capacitor on the control unit side even when a timer is set is provided. It is an object of the present invention to provide an electric rice cooker in which rice is cooked whenever a motor timer times out.

[0008]

Means for Solving the Problems Each of the inventions according to claims 1 to 3 of the present application is provided with the following means for solving the problems in order to achieve the above objects.

(1) The invention of claim 1 The electric rice cooker of the invention of claim 1 includes a control switch,
A rice cooker that heats the rice cooker when power is supplied when the control switch is closed, a motor timer that supplies power to the rice cooker after a set time has elapsed, and an open / close state of a control switch of the rice cooker is controlled. An electric rice cooker comprising a control unit, a rice cooker switch operated during rice cooking, and a rice cooker memory capacitor charged when the rice cooker switch is operated and closing a control switch of the rice cooker heater via the control unit. At
A charge power supply line is provided for supplying a charge voltage to the rice cooking memory capacitor with a voltage applied to the timer motor of the motor timer when the timer reservation rice cooking of the motor timer is set.

Therefore, when the user rotates the dial of the motor timer to set the timer reservation rice cooking, even if the rice cooker switch is not operated before the rotation operation of the dial knob of the motor timer, even if the rice cooker switch is not operated, the user cannot use the rice cooking memory. The charge voltage is supplied to the capacitor via the charge power line in accordance with the supply of power to the timer motor power supply terminal of the timer switch of the motor timer, so that the rice cook memory capacitor is charged and the rice cook switch is operated. The control unit is set to the rice cooking state in the same manner as in the above case, and the control switch of the rice cooking heater is closed to enable the power supply to the rice cooking heater when the motor timer expires.

As a result, it is possible to reliably cook rice even when the user sets the motor timer without operating the rice cooker switch.

(2) An electric rice cooker according to a second aspect of the present invention, in the electric rice cooker according to the first aspect of the present invention, wherein the charge power supply line is a timer motor in a timer switch of a motor timer. Is connected to a power supply terminal via a voltage dividing resistor.

Accordingly, as described above, when the dial knob of the motor timer is rotated and power is supplied to the power supply terminal for the timer motor in the timer switch of the motor timer, the voltage is divided at that time. A predetermined charge voltage divided via the resistor is supplied to the rice cook memory capacitor, and the rice cook memory capacitor is charged.

(3) An electric rice cooker according to a third aspect of the present invention is the electric rice cooker according to the first or second aspect of the present invention, wherein the electric rice cooker further comprises: And a discharge circuit that discharges the rice cooking memory capacitor when the rice cooker temperature detecting means detects a predetermined rice cooker temperature.

Therefore, when the rice cooker temperature reaches a predetermined set rice cooker temperature, the rice cook memory capacitor is discharged and reset.

[0016]

As a result, according to the electric rice cooker of the present invention, there is no longer a mistake in rice cooking at the time of timer reservation rice cooking, and the usability and reliability as a product are improved.

[0017]

Embodiment

(Embodiment 1) Hereinafter, the configuration and operation of an electric rice cooker according to Embodiment 1 of the present invention will be described with reference to the accompanying drawings (FIGS. 1 to 3).

First, FIG. 1 shows a structure of a rice cooker main body of the electric rice cooker employing a heater as a heating means, for example.

The electric rice cooker according to the present embodiment is, for example, a so-called rice cooker of the so-called rice cooker type which serves both to cook rice and to keep heat. A container body comprising a bottomed cylindrical outer case 1 configured so that a rice cooker (inner pot) 3 can be set therein, and a lid unit 2 for covering the upper part of the outer case 1 is provided. It is configured.

The outer case 1 comprises a bottomed cylindrical cover member 4 made of a synthetic resin, and a synthetic resin shoulder member 5 connected to the upper end of the cover member 4. Is provided with a bottomed cylindrical inner case 6 for setting the rice cooker 3 so that it can be taken out.

The inner case 6 is made of a bottomed cylindrical metal plate, its upper end against the shoulder member 5 is coupled, on the outer circumferential surface vertically central portion of the side wall portion 6a is kept heater H ₂ Provided. A center sensor 7 is provided at the center of the bottom wall 6b of the inner case 6 so as to contact the bottom of the rice cooker 3.

The center sensor 7 is provided at the bottom 3 of the rice cooker 3.
is intended to act as a food unit temperature detecting means and rice instrument set detection means for detecting the temperature of a, rice instrument thermistor S ₁ and rice device 3 is a rice device temperature detecting means for detecting whether it is set known sensor structures housing the reed switch S ₂ is a set detecting means is employed.

Further, on the upper surface of the bottom wall 6b of the inner case 6, the heater plate 9 provided with a cooking heater H ₁ as rice vessel heating means so as to surround the thermistor S ₁ part of the center sensor 7 Are arranged. The heater plate 9 is closely adhered to the bottom 3a surface of the rice cooker 3 set in the inner case 6 without any gap.
And the outer peripheral surface thereof is heated with good heat conductivity.

On the other hand, the lid unit 2 has an outer cover 10 made of synthetic resin forming the outer peripheral surface thereof, and an inner frame 11 forming an annular frame on the inner peripheral surface of the outer cover 10.
And an inner cover 13 that removably covers an inner radial opening of the inner frame portion 11 via a poly cover packing 12 to form a hollow structure as illustrated. The lid unit 2 is attached to the rear end side of the shoulder member 5 via a hinge mechanism 14 so as to be freely rotatable in the vertical direction. A lock mechanism 15 that engages with the position and maintains the closed state of the lid unit 2 is provided.

Reference numeral 16 denotes a steam release passage, and reference numeral 26 denotes a steam discharge pipe provided at a lower portion of the steam release passage 16 and having a function of returning to the end.

Further, between the inner case 6 and the outer case 1, there is provided a control unit (reference numeral 20 in FIG. 2) for controlling the energization of each of the rice cooking heater H ₁ and the heat retaining heater H ₂ . The control board 24 is accommodated. On the upper end side of the front surface of the shoulder member 5, an R-shaped operation panel 21 constituting an operation unit is provided. The operation panel 21 includes various switch groups (eg, a rice cooker switch SW ₁ and a rice cooker cancel switch SW ₃ shown in FIGS. 2 and 3) necessary for cooking rice, and a switch operation state selected by each of the switches. And the like, and a display section 53 such as a lamp for displaying the information and the like to be visually recognized by the user.

On the back side of the operation panel 21, a component board (operation board) 25 provided with these components is provided.

The TLR is a motor timer unit similar to that of the above-described conventional example, and includes a dial knob 80 for setting a reservation time, a timer motor M, a timer switch (see FIG. 2), and the like. I have.

Next, based on FIGS. 2 and 3, a specific configuration of the rice cooking / heating control circuit in the electric rice cooker main body of FIG. 1 will be described. In FIGS. 2 and 3, parts corresponding to the respective parts shown in FIG. 1 are denoted by the same reference numerals.

First, in FIG. 2, a power supply voltage AC100 (V) from a household commercial AC power supply is supplied with a temperature fuse F for detecting an abnormal heating state of the rice cooker 6 and fusing it, and a timer of a motor timer unit TLR. The rice is supplied to the rice cooking heater H ₁ and the heat retention heater H ₂ via the switch TS, and the voltage drop resistor R ₆ and the rectifier diode D ₂ , the voltage dividing resistors R ₄ and R ₄ are further supplied from the timer switch TS. ₅ and diode operation power input terminal a of the control unit 20 D ₁ a through respectively, so as each is supplied as the operation power supply voltage to the capacitor charge voltage input terminal b for cooking memory. In addition,
The configuration of the control unit 20 will be described later.

The rice cooking heater H ₁ and the warming heater H ₂ are connected to each other in parallel.

[0032] Then, between the cooking heater H ₁ and the power source side ground line relay switch (control switch) RS-stove heater control relays between and kept the heater H ₂ and the power supply side ground line, Each triac TRC is connected in series. It said control unit relay switch RS is a rice device temperature detected by the thermistor S ₁ of the center sensor 7 at the time of cooking parameters 20
ON / OFF control is performed by a relay coil RL that is excited by an output from the side, while the triac TRC uses the parameter of the rice cooker temperature detected by the thermistor S ₁ of the center sensor 7 as a parameter during the heat retention. ON / OFF control is performed by the output of the firing angle control signal from the control unit 20.

A resistor R ₂ , a rice cooker lamp PL ₁ , a warming lamp PL ₂ , and a resistor R ₃ are connected in parallel to the rice cooker H ₁ and the relay switch RS, respectively.

Also, the motor timer unit TLR is
The timer switch M includes a timer motor M that rotates in proportion to the power supply frequency and the timer switch TS. The timer switch TS includes a power-off contact terminal A and a power-on contact terminal B.
And a timer motor ON contact terminal C which is a power supply terminal for the timer motor M. When the timer switch TS switches the movable contact piece to the motor ON contact terminal C side by rotating the dial of the motor timer unit TLR at the time of setting the timer,
When the timer motor M is turned on and rotates in proportion to the power supply frequency, the amount of rotation of the dial knob (rotation operation angle)
After a lapse of time according to the above, the movable contact piece is turned on by the power ON
To supply power to the rice cooking heater H ₁ (and the heat retaining heater H ₂ ). Note that the timer motor M, a timer lamp PL ₃ via a resistor R ₁ are connected in parallel, the timer Sui Tutsi movable contact piece of the TS is switched to a timer motor ON contact terminal C timer motor M When turned on, the timer lamp PL ₃
Lights up to indicate that the timer motor M is operating.

On the other hand, the control unit 20 is connected to the thermistor S ₁ and the reed switch S _{2 of the} center sensor 7 via input terminals g and h as external devices.

Next, a specific control circuit configuration in the control unit 20 is shown in FIG. In the case of the present embodiment, the control unit 20 has an electronic circuit configuration without a microcomputer as shown, and is provided as a unit on a single control board.

On the control board of the control unit 20, eight input / output terminals a to h are provided as described above.

First, the terminal a is configured as an operating power supply input terminal of the control circuit of the control unit 20. As described above, the dc (step-down) and rectified DC (voltage) is reduced through the voltage drop resistor R ₆ and the rectifying diode D _2. enter the pulsating) voltage, after smoothed by the smoothing capacitor C _1, which is to obtain a constant voltage power supply with a constant voltage of Zener diode ZD.

Further, b terminals are charge voltage input terminal for supplying a memory voltage (charge voltage) to the cooking memory capacitor C ₂ when the timer motor M operation of the motor timer unit TLR, timer motor M
At the same time as the turning on of the timer motor, the direct current (pulsating current) from the charge power supply line Lc supplied after being divided and rectified from the timer motor ON contact terminal C via the voltage dividing resistors R ₄ and R ₅ and the rectifying diode D _1. ) enter the voltage to charge the cooking memory capacitor C _2. The該炊rice memory capacitor C _2, while the rice cancel switch SW ₃ is connected in parallel, further resistor R ₇ and cooking switch SW ₁ and the series between the operating supply input line from the terminal a It is connected to the.

Next, CP ₁ is a comparator for cooking memory, and its non-inverting input the terminal b to the terminal side, the rice cancel switch SW _3, and cooking switch SW _1, a capacitor C ₂ for cooking memory, the emitter are respectively connected discharge transistor Q _1. The inverting input terminal is connected to the middle point of the voltage dividing circuit of the voltage setting resistors R ₈ and R ₉ ,
A predetermined reference voltage is input.

The rice cooker memory comparator C
Output terminals of the P ₁ are respectively connected to the base and the resistor R ₁₆ of the cooking relay driving transistor Q ₂ through a diode D ₄ connected in the reverse direction. The collector of rice relay driving transistor Q ₂ are cooking heater control signal output terminal e, which is connected to the ground side f terminals of f, the rice relay dropped the same ground side f the terminal at the time of ON operation to ground relay A current is supplied to the coil RL to turn on the relay switch RS.

Further, CP ₂ is a rice cooking temperature judging comparator, and a rice cooker temperature detection signal from the thermistor S ₁ of the center sensor 7 is inputted to an inverting input terminal thereof through a resistor R _14. and that one, so that the reference voltage for cooking temperature determination, which is the partial pressure set by the voltage setting resistor R ₁₁ and R ₁₃ are inputted to the non-inverting input terminal.
Then, the output terminal via a resistor R ₁₅ to the base of the discharge transistor Q _1, also reverse diode D ₃
They are respectively connected to the base and the resistor R ₁₆ of the cooking relay driving transistor Q ₂ through.

Further, CP ₃ is a heat retention comparator, and a rice cooker temperature detection signal from the thermistor S ₁ of the center sensor 7 is input to an inverting input terminal thereof via a resistor R ₁₄ . on the other hand, so that the reference voltage for insulation temperature determination, which is the partial pressure set by the voltage setting resistor R ₁₀ and R ₁₂ are inputted to the non-inverting input terminal. Then, the output terminal is connected to the triac firing angle control signal output terminal e through a resistor R _17.

Therefore, in the case of the above configuration, first, in the mode in which the timer switch TS is connected to the power ON contact terminal B (normal rice cooking and warming mode other than timer reserved rice cooking), the following operation is performed.

Now, for example, in a state before rice cooking is started,
Thermistor S ₁ normal The center sensor 7 has become the temperature is low to a high resistance state, and since the charge is in the cooking memory capacitor C ₂ is not charged, the voltage across is almost 0V state .

Therefore, at this time, the rice cooker switch S
Press the W ₁ and (ON to), the terminal a current flows through the resistor R ₇ than the operating power input line via a charge to the cooking memory capacitor C ₂ is charged (this time rice cancel switch SW ₃ And discharge transistor Q ₁
Is OFF state). Then, the reference voltage (threshold voltage) the non-inverting input terminal than set by the voltage divider circuit of the voltage setting resistor R ₈ and R _9, which is connected to the inverting input terminal of the comparator CP ₁ for the cooking memory Side voltage is higher, so the above rice cooker memory comparator C
The output of the P ₁ becomes the H level.

Further, whereas since the inverting input terminal of the cooking temperature determining comparator CP ₂ is towards the temperature of the thermistor S ₁ of the center sensor 7 is lower has a high resistance state, the input voltage for determination cooking temperature Comparator CP
_The voltage setting resistor R ₁₁ connected to the non-inverting input terminal ₂
And it becomes lower than the voltage dividing circuit by the reference voltage for the cooking temperature determination set of R ₁₃ (threshold voltage), the output of the cooking temperature determining comparator CP ₂ becomes H level. For this reason, the rice cooker relay driving transistor Q ₂
The base voltage by the resistor R ₁₆ becomes H level, so rice relay driving transistor Q ₂ is turned ON, a current flows to the relay coil RL, the relay coil RL
And excited, the relay switch (function as a cooking heater control switch) is ON, the current flows to the cooking heater H _1, by heating the rice device 3 starts cooking.

On the other hand, as the rice cooking nears the end, rice absorbs water by heat and β-starch becomes α-starch.
Of the bottom 3a of the rice cooker 3
The temperature rises and the heat is transferred to the bottom portion 3a and the heat bonded to that center sensor 7 of the same rice unit 3, and increase the temperature of the thermistor S ₁ that is in the center sensor 7, of the thermistor S ₁ The resistance value decreases. Then, the voltage at the non-inverting input terminal of the cooking temperature determining comparator CP ₂ is because it is determined by the resistance value of the thermistor S ₁ of the resistance value and the voltage setting resistor R ₁₄ of the cooking termination detection, the Thermistor S caused by temperature rise of center sensor 7
Increases with decrease in the _first resistance value, from the cooking temperature determination reference voltage at the non-inverting input terminal of the cooking temperature determining comparator CP ₂ (voltage set by the voltage setting resistor R ₁₁ and R ₁₃₎ Will also be higher. This rice cooking temperature determination reference voltage is
Although set by the thermistor S ₁ and the resistor R ₁₄ as described above, the resistance value of the thermistor S ₁ is being the value at about 130 ° C..

Then, a cooking rice temperature judging comparator C
The point in time when the voltage of the inverting input terminal of P ₂ becomes higher than the above-mentioned reference voltage of the non-inverting input terminal (that is, the end of rice cooking)
In the output of the cooking temperature determining comparator CP ₂ becomes L level. And, whereby a current flows from resistor R ₁₆ through the diode D _3, since correspondingly turned OFF from the rice relay driving transistor TR ₂ is ON, the relay switch RS of the cooking relay OF
At F, the rice cooker stops heating and the rice cooker ends.

On the other hand, kept start determination reference voltage at the non-inverting input terminal of the temperature-maintaining comparator CP ₃ is set by the voltage setting resistor R ₁₀ and R _12, also the input voltage of the inverting input terminal is the center is set by the resistance value of the thermistor S ₁ of the sensor 7 and the resistance value of the resistor R _14, incubated start determination reference voltage (threshold voltage) output of the temperature-maintaining comparator CP ₃ at this time is reversed from about 72 ° C. When the temperature detected by the thermistor S ₁ of the center sensor 7 is 72 ° C. or higher, the output of the heat retention comparator CP ₃ is L, and the heat retention heater control is performed. Triac TRC is OFF, and the heater H ₂
Does not generate heat. Conversely, if the temperature of the rice cooker detected by the thermistor S ₁ of the center sensor 7 is 72 ° C. or less, the output of the heat retaining comparator CP ₃ becomes H, and the above-mentioned heat retaining heater control triac TRC turns ON.
₂ generates heat and performs heat retention control.

By the way, as already described in the section of the prior art, in the configuration of the conventional rice cooking circuit shown in FIG. 5, in the case of timer-reserved rice cooking, the movable contact piece of the timer switch TS is connected to the power ON contact terminal B. leave this state, first, the cooking switch SW ₁ is turned oN to charge the capacitor cooking memory, then the dial knob of the timer motor M rotates the operation, the timer Sui Tutsi TS timer motor oN contact terminal C of the movable contact piece of In this case, the time is up after the set time has elapsed, and when the movable contact becomes the power-on contact terminal B, normal rice cooking is started. On the contrary, the dial of the motor timer unit TLR is first turned. Turn, when the movable contact piece of the motor timer unit TLR timer motor oN contact terminal C, and then cooking the switch SW ₁ O to Even if it is N, the power supply on the control unit 20 side is substantially 0 V, so that the rice cooking memory capacitor cannot be charged. Therefore, the motor timer unit T
There is a disadvantage that the rice cooker is not started even if the LR times out and the movable contact of the timer switch TS returns to the power ON contact terminal B.

[0052] However, in the configuration of the above present embodiment, when even if the above-mentioned (even forget the operation of the cooking switch SW ₁₎ the timer reservation cooking setting operation is performed, voltage dividing resistors R ₄ since the voltage from the divided timer motor oN contact terminal c by R ₅ is always charged to the rectifying diode cooking memory capacitor C ₂ through the charge power supply line Lc with D _1, the conventional such problems occur do not do. And the motor timer unit T
LR is at the output of the cooking temperature determining comparator CP ₂ with the time-up becomes L lowers the base voltage of the discharge transistor Q ₁ through automatically resistors R _15, ON the same discharge transistor Q ₁ to to to reset the cooking memory capacitor C ₂ by flowing the electric charge charged in the cooking memory capacitor C ₂ to the earth line.

As described above, in the configuration of the electric rice cooker according to the first embodiment of the present invention, the timer is set automatically by turning the dial knob 80 of the motor timer unit TLR for timer reservation rice cooking. because it is charged to the cooking memory capacitor C _2, even forgets pressing the cooking switch SW _1, when the motor timer unit TLR has timed can reliably initiate a cooking.

[0054] (Modification 1) In the configuration of the first embodiment, for example, even if tentatively set the above-mentioned motor timer unit TLR the timer reservation state, unless you press cooking switch SW _1, a timer reservation rice is to not realized, for example, the power oN contact contact terminal b may be so connected to the power supply side point P of the cooking switch SW ₁ of FIG 3. That way, when the timer reservation rice, by operating the motor timer unit TLR, and the first timer reservation cooking function by pressing the cooking switch SW ₁ can be configured to be realized.

[0055] (Modification 2) In addition, the capacitor C ₂ for cooking the memory in the first embodiment, for example above the control unit 20, not of the electronic control circuit types, such as 3, those of the microcomputer type The same applies to the case where In this case, the rice cooker switch SW ₁ and the rice cooker cancel switch SW ₃ shown in FIG. 3 are externally connected to the microcomputer type control unit 20, and the rice cooker memory capacitor C ₂ is replaced with the rectifier diode D ₁ shown in FIG. It is sufficient to insert the external power supply between the charge power supply line Lc and the ground power supply line, that is, between the b terminal and the d terminal.

(Embodiment 2) Next, FIG. 4 shows a configuration of a rice cooking / heat keeping control circuit of an electric rice cooker according to Embodiment 2 of the present invention.

In the configuration of the present embodiment, unlike the configuration of the first embodiment, the power input terminal a of the control unit 20
Is directly connected to the temperature fuse F side via the voltage drop resistor R ₁₉ and the diode D ₁ without passing through the timer switch TS, thereby enabling the power to be supplied at all times. With such a configuration, the first embodiment
Compared to that of, albeit necessary to always turn ON the cooking switch SW ₁ to the pre- or post, whereas it is possible to prevent the cooking mistakes in the case where the timer setting substantially Similarly, in the first embodiment There is an advantage that the charge power supply line Lc for the rice cook memory capacitor via the voltage dividing resistors R ₄ and R ₅ and the b terminal, the resistor R ₆ and the rectifying diode D ₂ becomes unnecessary.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a rice cooker main body of an electric rice cooker according to Embodiment 1 of the present invention.

FIG. 2 is an electric circuit diagram showing a configuration of a rice cooking / heat keeping control circuit of the electric rice cooker.

FIG. 3 is an electric circuit diagram showing a specific circuit configuration of a control unit of the electric rice cooker.

FIG. 4 is an electric circuit diagram showing a configuration of a rice cooking / heating control circuit of the electric rice cooker according to Embodiment 2 of the present invention.

FIG. 5 is an electric circuit diagram showing a configuration of a conventional rice cooking / heating control circuit of the electric rice cooker.

[Description of Signs] 7 is a center sensor, 20 is a control unit, H ₁ is a rice cooking heater, H ₂ is a warming heater, TLR is a motor timer unit, TS is a timer switch of a motor timer,
TRC triac, C ₂ is rice memory capacitors, CP ₁ is rice comparator, CP ₂ is a cooking temperature determining comparator.

Claims (3)

[Claims] 1. A rice cooker comprising a control switch, for heating a rice cooker when power is supplied in a closed state of the control switch, a motor timer for supplying power to the rice cooker after a lapse of a set time, and the rice cooker A control unit for controlling the open / close state of the control switch of the heater; a rice cooker switch operated during rice cooking; and a rice cooker memory which is charged when the rice cooker switch is operated and closes the control switch of the rice cooker heater via the control unit. An electric rice cooker comprising: a charge power line for supplying a charge voltage to the rice cooking memory capacitor by a voltage applied to the timer motor of the motor timer when timer reservation rice cooking of the motor timer is set. An electric rice cooker, characterized in that: 2. The electric rice cooker according to claim 1, wherein the charge power supply line is connected to a power supply terminal to a timer motor of a timer switch of the motor timer via a voltage dividing resistor. 3. A rice cooker temperature detecting means for detecting a rice cooker temperature, and a discharge circuit for discharging a rice cooking memory capacitor when the rice cooker temperature detector detects a predetermined set rice cooker temperature. The electric rice cooker according to claim 1 or 2, wherein: