KR101743973B1 - Electric cooker having automated pressure locking function and controlling method for automated pressure locking function - Google Patents

Abstract

The present invention relates to an inner pot in which a catching jaw is formed; Outer pot; Lid; Wherein the latching plate is adapted to each of the plurality of latching jaws when the lid is in the second position with the lid covered by the outer pot (i. E., Pressure locked) A plurality of latches formed to be released from a plurality of latching jaws (i.e., in a pressure released state) A position sensing unit for sensing the latch plate; A driving unit for providing a rotational force for rotating the latch plate; Wherein the control unit is configured to perform a cooking operation and to reduce the rotational force of the driving unit to a predetermined acceleration when it is detected that the latch plate is rotated to approach the first position or the second position, The present invention relates to an electric rice cooker.

Description

TECHNICAL FIELD [0001] The present invention relates to an automatic cooker and an automatic rice cooker having an automatic pressure lock function,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic rice cooker having an automatic pressure locking function and a method for controlling the automatic pressure locking function of the rice cooker. More particularly, the present invention is to realize an automatic pressure locking function in an electromagnetic cooker.

BACKGROUND ART [0002] Generally, an electric pressure cooker is a device that cooks while keeping the inside of the inner pot at a constant pressure by electric heating using electricity. The device is largely composed of an outer pot on which the inner pot is seated and a lid configured to simultaneously cover the outer pot and the inner pot .

On the other hand, a conventional electromagnetic cooker having a lid automatic locking device is disclosed in Japanese Patent Application Laid-Open No. 1999-019510 (titled automatic lid locking device for electric pressure cooker).

1 is a view for explaining an electromagnetic cooker having a lid automatic locking device according to the prior art. Fig. 1 (a) is a perspective view showing a part of an oven and a rotator constituting a lid automatic locking apparatus according to the prior art, and Fig. 1 (b) 1 (c) is a longitudinal sectional view of an electric pressure cooker according to the prior art.

A plurality of oven engagement pieces 111 are formed on the upper surface of the oven 13 constituting the main body 1 so as to be bent outwardly while being spaced apart from each other by a predetermined distance and the inner cover 22 constituting the lid 2, Shaped rotating body 211 is rotatably supported on the outer circumferential surface of the upper heat plate 23 fixed to the upper heat plate 23. A plurality of rotating bodies 211 are formed in the lower circumferential surface of the rotating body, A motor 213 is attached to the inner cover 22 constituting the lid 2 so as to generate a unidirectional driving force by receiving a control signal of the controller, And a lever 215 is mounted on the inner cover 22 so as to rotate within a predetermined angle around the hinge point at one end in response to the rotational force of the rotary plate 214. [ And one end of the lever is hinged, The other end of the lever 215 is connected to the upper surface of the rotating body 211 as a connecting pin 216 so that the rotating body 211 is rotated according to the rotation of the rotating body 211. The rotating body 211 is connected to the inner cover 22, The cover cover 21 forms an inner cover elongated hole 217 so as to prevent the connection pin from interfering with rotation of the lever 215 through the connection pin 216. The top cover 21 constituting the lid 2, The first switch 218 and the second switch 219 are provided so as to transmit a signal corresponding to the contact of the lever 215 to be rotated to the controller so that the drive of the motor 213 can be controlled by the controller.

When the user selects the cooking mode, the motor 213 in the inner cover 22 constituting the lid 2 generates a unidirectional driving force by receiving a control signal of the controller, and the generated driving force is transmitted to the rotating plate The eccentric shaft 220 fixed to the rotary plate 214 is engaged with the lever cover 215 of the lever 215 having one end hinged to the inner cover 22, The lever 215 is rotated in the clockwise direction with respect to the hinge point in the state shown by the solid line in FIG. 1 (b), and is positioned as shown by the one-dot chain line.

The lever 215 is moved to the first switch 218 in the top cover 21 constituting the lid 2 at any moment when the rotating body 211 rotates in the clockwise direction in accordance with the clockwise rotation of the lever 215 The first switch is switched on and the signal is immediately transmitted to the controller, so that the driving of the motor 213 is stopped by the control of the controller. At this time, the oven striking pieces 111 formed in the oven 13, The lid 2 is locked to the main body 1 as each of the rotational holding lugs 212 formed on the whole body 211 is positioned vertically and vertically so that each of the rotational holding lugs is caught by the oven receiving piece 111 .

This operation can be similarly applied to the counterclockwise rotation of the rotating body.

On the other hand, in the above-described conventional technique, there is no control function for the rotation speed of the motor 213, so that when the motor 213 starts rotating or stops rotating, It may cause damage to various connected parts.

Further, in the above-described conventional technique, there is no countermeasure against the error situation of the first switch 218 or the second switch 219. [

On the other hand, in the above-described conventional technique, the first switch 218 and the second switch 219 are mechanically operated by being pushed by the lever 215. However, in recent years, A magnetic force sensor magnetically acting on a specific part of the rotating body 215 or the rotating body 211 is used. However, even in such an improvement, since the magnetic force sensor detects that the specific portion of the rotating body 211 approaches to some extent, rather than being able to sense the final state in which the rotating body 211 completely rotates to a specific point , And generates a magnetic sensing signal before the rotating body 211 reaches a specific point.

Published Patent Application No. 1999-019510

In order to solve the above problems, the present invention provides an electromagnetic rice cooker which automatically performs a pressure lock / unlock operation, wherein when detecting the rotation of the catch plate using a magnetic force sensor, And to provide a method capable of stopping the operation accurately.

According to an aspect of the present invention, there is provided an electromagnetic cooker having an automatic pressure locking function, comprising: an inner pot in which a plurality of locking protrusions are formed around an upper side; An outer pot on which the inner pot is seated; A lid which simultaneously covers the inner pot and the outer pot; And a latching plate having a ring shape and capable of reciprocating between a first position and a second position by being rotated inside the lid, the latching plate comprising: And a plurality of latches which are in a pressure-locked state, respectively, which are fitted to the plurality of latching jaws when in the second position, and into a pressure-released state in which they are released from the plurality of latching jaws when in the first position; A position sensing unit disposed at the first position or the second position for sensing a variation of a magnetic force interacting with a specific portion of the latch plate to sense that the latch plate is close to the first position or the second position; A driving unit for providing a rotational force for rotating the latch plate in one direction or another direction in accordance with an input of a rotation control signal to switch the pressure locking unit into a pressure locking state or a pressure releasing state; A cooking operation is performed by heating the inner pot by controlling the power supply to the heater disposed around the inner pot and the rotation control signal is outputted to the driving unit by the user's operation or at the start or completion of the cooking operation, Characterized in that the control unit continuously reduces or gradually reduces the rotational force of the driving unit by an arbitrary acceleration after the detection of the proximity of the latch plate to the first position or the second position. .

At this time, the control of the rotational force may be implemented by PWM control of the power supplied to the driving unit.

In addition, the control unit may stop the operation of the driving unit when a predetermined time elapses after reducing the rotational force by the acceleration.

Further, the control unit may cause the latch plate to rotate back to the first position if it is not detected that the latch plate is close to the second position by a predetermined time after the latch plate starts rotating at the first position, The latch plate may be reversely rotated for a predetermined time, and then rotated back toward the second position and the predetermined time may be timed.

According to another aspect of the present invention, there is provided a method for controlling an automatic pressure locking function of an electromagnetic cooker, including: an inner pot in which a plurality of latching jaws are formed on an upper side of a periphery; an outer pot on which the inner pot is seated; a lid that simultaneously covers the inner pot and the outer pot; And a controller for controlling the power supply to the heater disposed in the vicinity of the inner pot to perform the cooking operation by heating the inner pot, the electromagnetic cooker comprising: Receiving a signal for switching to a pressure-locked state or a pressure-released state; The latch plate having a plurality of latches which are formed in a ring shape and can be fitted or released to the plurality of latching jaws as the latching member rotates inside the lid is rotated from the first position to the second position by the rotational force of the driving unit, ; Sensing a proximity of the latch plate to the second position by sensing a variation in magnetic force disposed in the second position and interacting with a particular portion of the latch plate; And continuously reducing or stepwise decreasing the rotational force of the driving unit by an arbitrary acceleration after the latch plate is rotated and sensing the proximity of the latch plate to the second position.

In this case, if the latch plate is not detected to be close to the second position by a predetermined time after the latch plate starts rotating at the first position, the latch plate is rotated backward to return to the first position Or rotating the latch plate in a reverse direction for a predetermined time, rotating the latch plate toward the second position, timing the predetermined time, and then stopping the driving unit.

According to the method for controlling the automatic pressure locking function of the electromagnetic cooker and the electromagnetic cooker with the automatic pressure locking function according to the present invention as described above, When the release operation is processed, the latch plate can be accurately stopped at the first position and the second position.

It is also possible to prevent the connecting parts from being damaged by the rapid acceleration and deceleration of the driving part at the initial stage and the late stage of rotating the latch plate.

Further, when the pressure lock / unlock operation is not normally performed, it can be processed in an optimum manner.

1 is a view for explaining an electromagnetic cooker having a lid automatic locking device according to the prior art.
2 is a block diagram schematically showing the configuration of an electromagnetic cooker having an automatic pressure locking function according to an embodiment of the present invention.
FIG. 3 is a view for explaining the sensors arranged relative to the latch plate, the positional relationship between the first position and the second position, and the action of each sensor in the electromagnetic rice cooker according to FIG.
4 is a graph for explaining the control of the rotational force by the driving unit in the electromagnetic rice cooker according to the embodiment of the present invention.
5 is a graph for explaining the control of the rotational force by the driving unit in order to solve a situation where an error occurs in the rotation of the latch plate when the pressure locking function is operated.
6 is a flowchart illustrating a method of controlling an automatic pressure locking function of an electromagnetic cooker according to another embodiment of the present invention.
7 is a flowchart of a procedure for processing an error situation occurring in operation of the automatic pressure lock function shown in Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an automatic rice cooker having an automatic pressure lock function and a method of controlling an automatic pressure lock function of an electromagnetic cooker according to the present invention will be described with reference to the accompanying drawings. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments of the invention only and is not intended to be limiting.

2 is a block diagram schematically showing the configuration of an electromagnetic cooker having an automatic pressure locking function according to an embodiment of the present invention. The rice cooker includes an inner pot (13), an outer pot (1), a lid (2), and a control unit (240). Furthermore, the electromagnetic rice cooker having the automatic pressure locking function according to an embodiment of the present invention may further include a pressure coupling part, a position sensing part 210, and a driving part 220.

The inner pot (13) can be filled with food for cooking or rice and water for cooking, and a plurality of outwardly-extending latching lugs (111) can be formed around the upper side.

The outer pot (1) is configured so that the inner pot (13) can be seated. In the outer pot 1, a heating section 14 for heating the inner pot 13 may be disposed. The heating unit 14 may be, for example, a heater that generates heat by input of a power source, or an induction heating coil for heating the inner pot.

The lid 2 is rotatably disposed on one side of the outer pot 1 and configured to cover the inner pot 13 and the outer pot 1 at the same time. The lid 2 can be fixed to the outer pot 1 with the outer pot and the inner pot covered.

When receiving a request for starting a predetermined cooking function from the user, the control unit 240 heats the inner pot 13 by controlling power supply to the heating unit 14. [ By heating the inner pot 13, the food contained in the inner pot is cooked or kept warm, or cooked using rice and water.

The pressure clamping portion includes a ring-shaped latch plate 211 configured to be rotatable within the lid 2 so as to be able to reciprocate between the first position and the second position.

The latch plate 211 is formed with a plurality of latches 212 that are directed in the ring-shaped circumferential direction. The latches 212 are configured to be aligned with or released from the latching jaws 111 of the inner pot.

Thus, when the lid 2 covers the inner pot 13 and the outer pot 1 and the latch plate 211 rotates in one direction and is in the second position, the latches 212 are engaged with a plurality of latching jaws (111), respectively. When the lid 2 is covered with the inner pot and the outer pot and the latch plate 211 rotates in the other direction and is in the first position, the latches 212 are released from the plurality of latching jaws 111, And is released.

The position sensing unit 210 is disposed near the latch plate 211 or in the vicinity of the driving unit for rotating the latch plate 211 to detect that the latch plate 211 is close to the first position or the second position do.

The second position is a position where the latches 212 of the latch plate are aligned with the latching jaws 111 of the inner pot so that the inner pot 13 is pressure-locked. The first position is a position at which the latches 212 of the latch plate are completely released from the latching jaw 111 of the inner pot so that the inner pot 13 is brought into the pressure releasing state. These positions may be measured on the basis of the position of the specific portion of the latch plate 211, or on the basis of the position of the specific point of the driving portion.

The position sensing portion 210 may include, for example, a specific portion of the latch plate 211 or a magnetic force sensor magnetically interacting with the driving portion. This magnetic force sensor can sense a portion of the latch plate 211 at each position or a portion of the drive 220 that drives the latch plate when the latch plate 211 is positioned at the first and second positions, respectively (See FIG. 3). The position sensing unit 210 may include a first sensor 218 disposed at a first position and a second sensor 219 disposed at a second position. The first sensor 218 outputs a first signal, and the second sensor 219 outputs a second signal. The first signal and the second signal are transmitted to the control unit 240, and the control unit 240 controls the rotation of the latch plate 211 based on the signals transmitted.

The driving unit 220 provides a rotational force for rotating the latch plate 211 in any direction or in the opposite direction in accordance with the rotation control signal provided by the control unit 240. [

When the user directly inputs the pressure lock / unlock operation using a predetermined operating means (for example, a specific push button or a pressure lock / release manual knob or the like) When the inner pot (13) is automatically set to a pressure-locked state to start cooking according to the request for operation, or when the inner pot (13) is to be automatically put into a pressure-released state after cooking is completed, And outputs the generated rotation control signal to the driving unit 220. The rotation control signal generating unit 220 generates a rotation control signal for rotating or rotating the rotation unit 220,

The control unit 240 may output the rotation control signal to the first sensor 218 or the second sensor 219 based on a signal output from the first sensor 218 or the second sensor 219, It outputs a rotation control signal for reducing the rotational force of the driving unit 220 to a predetermined deceleration ratio. Thereafter, when the deceleration rate becomes 0, the rotation of the latch plate 211 is stopped. When the predetermined time has elapsed since the deceleration starts, the control unit 240 completely cuts off the rotation control signal to completely stop the rotation of the latch plate 211.

Furthermore, the control unit 240 can control the rotational force not only in the case of reducing the rotational force after rotating the catch plate 211 but also in accelerating at a predetermined rate even when the catch plate 211 starts to rotate. That is, the rotational force of the driving unit 220 may be continuously increased by a predetermined acceleration when the latch plate 211 starts to rotate in a stopped state.

At this time, the deceleration rate and / or the acceleration rate may be controlled to change continuously or stepwise by any variable acceleration.

In addition, the control of the rotational force may be implemented by PWM-controlling the power provided to the driving unit 220. [ Of course, it is also possible to control the rotational force by changing the magnitude of the current or voltage applied to the driving unit 220.

Next, with reference to Fig. 3, the sensors arranged relative to the latch plate, the positional relationship between the first position and the second position, and the action of each sensor will be described.

The driving force of the driving shaft 216 'is transmitted to the connecting pin 216' through a connecting pin 216 formed at one side of the latch plate 211, a driving shaft 216 ' And a lever 215 to which the lever 215 is applied. With this configuration, when the lever 215 is rotated in an arbitrary range by the driving force acting on the drive shaft 216 ', a rotational force acts on the latch plate 211 through the connection pin 216, ).

The rotation range of the latch plate 211 may be limited by the predetermined stopping members 231 and 232.

Magnetic force sensors 218 and 219 may be disposed at both ends of the range of rotation of the catch plate 211. These sensors may be disposed at one side of the lever 215 or at a portion of the catch plate 211 A portion of the latch protruding inwardly).

In the drawing, as an example, a structure in which a portion of a side surface (hatched portion) of the lever 215 interacts with the magnetic force sensors 218 and 219 is shown. Here, each of the magnetic force sensors 218 and 219 may have sensing ranges 218a and 219a, and each sensor 218 or 219 will output a sensing signal when a part of the lever 215 enters the range .

On the other hand, since the magnetic force sensor 217 is used, any one of the magnetic force sensors 218 and 219 can be used before the rotation of the catch plate 211 is completed and completely blocked by the stopping members 231 and 232 It is possible to sense the approach of the lever 215 and output a detection signal. Actually, the sensing range of the magnetic force sensor is not always constant but may be variable depending on various variables.

Therefore, even if the sensing unit 210 receives the sensing signal from the magnetic force sensor 218 or 219, the controller 240 advances the operation of the driving unit 220 to some extent and moves the latch plate 211 to the latching member 231 or 232 You need to turn it further until it reaches.

4 is a graph for explaining the control of the rotational force by the driving unit in the electromagnetic rice cooker for controlling the rotation of the catch plate by the magnetic force sensor as an example.

Fig. 4 (a) shows a control method in which the rotational force is gradually increased or gradually decreased at the beginning of rotation of the catch plate 211 and at the end thereof before the rotation is completed.

That is, when the user inputs a pressure locking operation or inputs a pressure release operation, the control unit 240 applies power to the driving unit 220 to rotate the latch plate 211 that is stopped at an arbitrary position.

At this time, the voltage or current of the power source applied to the driving unit 220 may be gradually increased or PWM controlled so that the rotational force gradually increases or gradually decreases as shown in the graph.

The control unit 240 rotates the latch plate 211 by maintaining the rotational force when the rotational force increases according to the constant acceleration or the variable acceleration to reach the maximum rotational force. When the magnetic force sensor 218 or 219 outputs a sensing signal, the controller 240 regards the rotation as being almost completed and applies a constant acceleration or a variable acceleration to reduce the rotational force.

The rotational force will be zero after a predetermined time. Alternatively, the control unit 240 may reduce the rotational force by outputting a detection signal from the magnetic force sensor, and immediately turn the rotational force to zero after a predetermined time elapses.

As described above, by gradually increasing the rotational force at the initial stage of rotation, the driving unit 220 starts to rotate rapidly, and the driving force is transmitted to various driving members (for example, driving shafts, levers, connecting pins, etc.) It is possible to prevent a sudden strong force from being applied and to prevent the motor of the driving unit 220 from being overloaded.

On the other hand, in the structure for detecting the position of the latch plate using the magnetic force sensor, even if the magnetic force sensor 218 or 219 outputs a sensing signal, the driving force continues to be applied for a predetermined period of time. It may be in a state in which the guide member 211 reaches the arrival position and is regulated by the engagement blocking member 218 or 219.

In the present invention, when the rotational force is gradually reduced at the end of the rotation of the catch plate 211 (the time from when the detection signal is input), thereby maintaining the driving force even though the catch plate 211 has already reached the arrival position , The load generated by the motor can be reduced, and the force acting on various driving members for generating rotational force can be reduced.

4 (b) shows an example in which the rotational force is not continuously controlled as shown in FIG. 4 (a) when the rotational force is increased or decreased, but is increased or decreased in a predetermined step. As such, the increase or decrease of the rotational force can be controlled in various ways.

Furthermore, it is also possible to apply a combination of continuous control and step control in various ways to each other.

5 is a graph for explaining the control of the rotational force by the driving unit in order to solve a situation where an error occurs in the rotation of the latch plate when the pressure lock function is operated.

The rice cooker according to the present invention automatically performs a pressure locking or releasing operation by rotating the catch plate 211 so that it is required to be configured to automatically handle a catching situation during rotation of the catch plate 211. [ When the pressure lock / unlock operation is performed in a state in which the lid 2 is not completely closed, when the foreign matter is caught between the latch 212 and the latching jaw 111, A case where an operation of the magnetic sensor 220 temporarily causes an error, a case where an error occurs in a part of the magnetic force sensors of the position sensing unit 210, and the like.

First, the control unit 240 operates the driving unit 220 to start rotating the latch plate 211 in an arbitrary direction (forward direction). At this time, it is possible to control by increasing the rotational force gradually. If the latching condition of the latch plate 211 occurs during the rotation of the latch plate 211 while the rotational force is maintained at the maximum (or the prescribed amount), the control unit 240 immediately , Gradually).

Then, the control unit 240 controls the driving unit 220 to rotate the latch plate 211 in the reverse direction for a predetermined time or by a predetermined angle, and to rotate the latch plate 211 in the forward direction again. The control unit 240 checks the latching condition again while the latch plate 211 is rotated in the forward direction. When the latch plate 211 arrives at the arrival position and a detection signal is input, And then the rotation is completed.

On the other hand, if a latching condition occurs during the normal rotation of the latch plate 211, the control unit 240 may return the latch plate 211 to the start position by reversing the latch plate 211, and notify the user of the latching condition.

Here, the latching condition measures the elapsed time from when the detection signal of the arrival point is outputted after the start of rotation or until the latch plate 211 is completely stopped, and when the measured time exceeds the predetermined reference time As shown in FIG. Alternatively, an arbitrary sensor may be disposed in each part to be driven, and it may be determined based on the output of the sensors 218 or 219 whether the rotating plate is caught by an error situation.

According to this configuration, when a flexible foreign matter is caught between the latch 212 and the latching jaw 111 and the operation of the driving unit 220 is temporarily caused to fail, the position sensing unit 210 A case where a temporary error occurs in some of the magnetic force sensors, and the like can be handled.

Since other error conditions may not be automatically processed, the control unit 240 may guide the user through the predetermined display means.

6 is a flowchart illustrating a method of controlling an automatic pressure locking function of an electromagnetic cooker according to another embodiment of the present invention. At any point in time, if a pressure lock or a pressure release is requested by a user's operation or by a predetermined control algorithm, the control unit generates a rotation control signal for pressure lock or release (S10). The generated rotation control signal is applied to the driving unit, and the driving unit rotates the latch plate with the rotation force corresponding to the rotation control signal (S20).

During the rotation of the latch plate, any one of the magnetic force sensors constituting the position sensing unit detects that the latch plate approaches the arrival position and outputs a detection signal (S30). When the control unit receives the detection signal, it reduces the rotational force (S40). Then, when a predetermined time elapses while maintaining the rotation while applying the reduced rotational force, the rotation is stopped (S50).

The time for maintaining the rotation may be set to, for example, 1 second. In actual operation, for example, after 0.5 seconds after receiving the detection signal, the latch plate reaches the arrival position and rotation can be regulated. Therefore, while the rotational force is applied for the remaining 0.5 seconds, the latch plate will be in the stopped state, and during this time, the load will be applied to the driving unit and various driving members. However, since the rotational force is sufficiently reduced, the load to be actuated is not large, so that the driving unit and the driving parts are not damaged.

On the other hand, even when the rotation is started in step S20, the rotational force may be controlled to be gradually increased.

7 is a flowchart of a procedure for processing an error situation occurring in operation of the automatic pressure lock function shown in Fig. In a state in which the driving unit is operated and the latch plate is rotated (S21), the control unit checks whether a latching condition occurs (S22).

The engagement condition can be checked, for example, in such a manner as to determine whether the elapsed time since the start of rotation exceeds the reference time, as described above. The jamming condition is, for example, 3 seconds. Thus, if the detection signal is not received from the magnetic force sensor at the arrival position until three seconds elapse after the control unit outputs the rotation control signal to operate the driving unit, it can be regarded as an error condition in which the catch plate can not rotate, The rotation of the latch plate is stopped.

Then, the driving unit is driven in reverse to rotate the latch plate in reverse (S23). The control portion can either return the latch plate to its starting position, or retract it slightly.

Then, the control unit can normally drive the driving unit to rotate the latch plate in the forward direction, thereby enabling to overcome the previous error situation (S24).

With this operation, the fragile foreign matter caught by the driving portion or the latch plate can be removed. In addition, the situation caused by temporary error of the electric circuit can be solved.

After the latch plates are driven again in the forward direction, the process returns to step S21, measures the elapsed time again, and repeats the operation of comparing the elapsed time with the preceding reference time.

If the detection signal from the arrival position is received within the reference time without the occurrence of the engagement condition, the control unit controls the operation of the driving unit for a certain period of time to reduce the rotational force and finally terminates the operation (S25).

In the above description, the pressure lock / unlock structure having the latch plate 211 rotated in the lid 2 has been described as an example, but the present invention is not limited to this structure.

That is, there is provided a retaining piece which protrudes and retracts individually by using a solenoid, a rack / pinion, etc., and a structure in which the retaining piece is protruded or retracted toward the retaining jaw of the inner pot, thereby making the lid and the inner pot into a pressure- It can be assumed.

Also in this structure, the protruding operation and / or the retracting operation of the engagement piece may be controlled so as to gradually increase and / or decrease the movement speed based on the detection signal of the magnetic force sensor.

The embodiments of the present invention described above are merely illustrative of the technical idea of the present invention, and the scope of protection of the present invention should be interpreted according to the claims. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the essential characteristics thereof, It is to be understood that the invention is not limited thereto.

Claims (6)

An inner pot in which a plurality of catching jaws are formed around the upper side;
An outer pot on which the inner pot is seated;
A lid which simultaneously covers the inner pot and the outer pot;
And a latching plate which is formed in a ring shape and rotates inside the lid so that a specific portion can reciprocate between the first position and the second position, the latching plate comprising: When the specific portion is in the first position, the pressure-releasing state is released from the plurality of latching jaws when the specific portion is in the first position, And a plurality of clasps;
By sensing a variation in magnetic force disposed in the first or second position and interacting with the particular portion of the catch plate, the particular portion of the catch plate is proximate to the first or second position A position sensing unit for sensing a position of the subject;
A driving unit for providing a rotational force for rotating the latch plate in one direction or another direction in accordance with an input of a rotation control signal to switch the pressure locking unit into a pressure locking state or a pressure releasing state; And
A cooking operation is performed by heating the inner pot by controlling the power supply to the heater disposed around the inner pot and the rotation control signal is outputted to the driving unit by the user's operation or at the start or completion of the cooking operation, The rotation force of the driving unit is continuously reduced or stepwise reduced by an arbitrary acceleration after the latch plate is rotated and it is detected that the specific portion is close to the first position or the second position, And a control unit for controlling the rotation control signal. The method according to claim 1,
Wherein the rotational force is controlled by PWM control of the electric power provided to the driving unit. The method according to claim 1,
Wherein the control unit controls the rotation unit so that the reduced rotational force is maintained for a predetermined time even when rotation of the specific portion of the latch plate reaches the first position or the second position, And an automatic pressure lock function. The method according to claim 1,
Wherein,
When the specific portion of the latch plate is not detected to be close to the second position by a predetermined time after starting the rotation at the first position, the latch plate is rotated backward to return the specific portion to the first position Or the latch plate is rotated in a reverse direction for a predetermined time and then rotated toward the second position, and the predetermined time is timed. A lid for covering the inner pot and the outer pot at the same time and a power supply for the heater disposed around the inner pot to control heating of the inner pot to heat the inner pot, And a controller for performing a cooking operation, wherein:
Receiving a signal for switching the inner pot to a pressure-locked state or a pressure-released state by a user operation or at the start or completion of the cooking operation;
The latch plate having a plurality of latches formed in a ring shape and being rotatable in the lid and adapted to be fitted or released to the plurality of latching jaws is rotated by the rotational force of the driving unit, Rotating from the first position toward the second position;
Sensing a proximity of the particular portion of the latch plate to the second position by sensing a variation in magnetic force disposed in the second position and interacting with the particular portion of the latch plate; And
And continuously reducing or stepwise decreasing the rotational force of the driving unit by an arbitrary acceleration after finally detecting that the specific portion is close to the second position by rotation of the latch plate The automatic pressure lock function control method of the electromagnetic cooker. 6. The method of claim 5,
In the rotating step,
And returning the specific portion to the first position by reversely rotating the latch plate if it is not detected that the specific portion of the latch plate is close to the second position by a predetermined time after starting the rotation at the first position Further comprising rotating the latch plate in a reverse direction for a predetermined time, rotating the latch plate toward the second position again, and stopping the driving unit after timing the predetermined time.

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