KR100187479B1 - Control instrument for discharge of pressure in electric pressure rice cooker - Google Patents

Abstract

According to the present invention, a transistor is turned on / off in accordance with a state of an object to be detected through a predetermined number of detection means and a control signal output from a microcomputer according to a pressure state inside a cooker, and a constant voltage source generated by a commercial power supply. The present invention relates to an electric pressure cooker having a solenoid valve for discharging the pressure inside the cooker to the outside during the turn-on operation of the transistor by a driving voltage generated in the above. In particular, an auxiliary constant voltage source different from the constant voltage source is provided, and the solenoid The valve receives a common voltage generated from the constant voltage source and the auxiliary constant voltage source as a driving power source, and has a switching means for opening and closing a path for transmitting the voltage generated from the auxiliary constant voltage source to the base terminal of the transistor. The switching means sleep to secure the lid to the cooker When providing a pressure release adjustment device for an electric pressure cooker characterized in that the device operates in response to the operation of the device, the power supply is not supplied for a specific reason during cooking, to remove the lid of the rice cooker or In case of unavoidable, there is an effect of preventing the risk of safety accidents caused by excessive pressure formed in the inside of the cooker when removing the lid of the cooker during cooking.

Description

Pressure release regulator of electric pressure cooker

The present invention relates to an electric pressure cooker, in particular, when the power supply is cut off due to power outage or removal of the power plug during cooking or when the lid is opened by the user during cooking, the inside of the cooker through the automatic operation of the solenoid at atmospheric pressure It relates to a discharge control device of the electric pressure cooker to be maintained.

In general, the pressure cooker uses a secondary heating method through the combustion of gas or the like, and attaches a metal having a good thermal conductivity to the bottom of the general pressure cooker and the pressure cooker to cook the cooked food therein, and then has a heater at the bottom thereof. And it is divided into electric pressure cooker of the way to cook the cooking inside by using electricity.

In the case of the above-described general pressure cooker, a pressure removing means is provided at a predetermined position on the lid to cook food inside by using combustion such as gas, for example, to stop supply of gas while cooking rice. When cooking is completed, the user maintains the pressure formed in the pressure cooker at atmospheric pressure by using the pressure removing means provided at the upper predetermined position of the lid.

However, in the latter electric pressure cooker, the pressure removing means for removing the pressure inside the cooker and maintaining the state at atmospheric pressure is controlled by a microcomputer, which can be detected as shown in FIG. When the microcomputer 1 outputs a predetermined control signal in a high or low state according to the state of the cooking object and the pressure inside the cooker, the output control signal is limited by the current of the transistor Q1 which is current limited by the resistor R1. Is applied to the base end.

Accordingly, the transistor Q1 is switched on / off in accordance with a signal applied to the base end to adjust the driving of the solenoid 2 connected in series with the power supply Vcc to the collector terminal to form a pressure formed inside the pressure cooker. The emission of the gas will be adjusted.

In the case of the conventional electric pressure cooker according to the above-described operation, if you want to remove the lid of the rice cooker during use, for example, if the power supply is not made due to a specific reason during cooking or if you want to remove the lid of the rice cooker or inevitable If you want to remove the lid of the rice cooker during the risk of safety accidents due to excessive pressure formed inside there is a problem that there is no special stabilizer to solve this problem.

An object of the present invention for solving the above problems is that when the power supply is cut off due to power outage or detachment of the power plug during cooking or when the lid is opened by the user during cooking, atmospheric pressure inside the cooker through the automatic driving of the solenoid It is to provide a discharge control device of the electric pressure cooker to maintain the state of.

In addition, the pressure relief device of Figure 1 using the solenoid valve to date structurally requires a considerable force to the user, looking at the reason, if you want to close the lid of the rice cooker close to the inner pot containing the cooking objects and the lid In addition, due to the compression action of the rubber parking provided on the inner pot or the lid, a pressure above the atmospheric pressure is generated in the inner pot, which also incurs the inconvenience of requiring considerable force to close the lid. It is easy to solve.

1 is a circuit diagram showing a solenoid driving device in a conventional electric pressure cooker,

Figure 2 is an illustration of the configuration of the pressure relief device according to the present invention in an electric pressure cooker

* Explanation of symbols for main parts of the drawings

1: microcomputer 2: solenoid

D1 to D4: Diodes R1 and R2: Resistance

Q1: transistor

Features of the present invention for achieving the above object is a transistor that is turned on / off in accordance with the state of the cooking object detected through a predetermined number of detection means and the state of the control signal output from the microcomputer according to the pressure state inside the rice cooker; In the electric pressure cooker having a solenoid valve for discharging the pressure inside the cooker to the outside during the turn-on operation of the transistor by a drive voltage generated from a constant voltage source generated by a commercial power source:

An auxiliary constant voltage source different from the constant voltage source is provided, and the solenoid valve receives a voltage generated from the constant voltage source and the auxiliary constant voltage source in common as a driving power source, and the voltage generated from the auxiliary constant voltage source is a base terminal of the transistor. It is provided with a switching means capable of opening and closing a path for transmitting to the switching means is to operate in response to the operation of the locking device for fixing the lid to the rice cooker.

An additional feature of the present invention for achieving the above object is provided with a diode for preventing the inflow of counter electromotive force, that is, between the constant voltage source or the signal at the voltage output path of the constant voltage source and the auxiliary constant voltage source and the control signal output terminal of the microcomputer. have.

An additional feature of the present invention for achieving the above object is that the switching means maintains the on-operation state when the lock is locked, and off when the lock is released.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram of a driving circuit of the pressure relief device according to the present invention, which is output from the microcomputer 1 according to the state of the cooked object detected through a predetermined number of detection means (not shown) and the pressure state inside the rice cooker. A first diode D1 for receiving and outputting a control signal in a predetermined state and a signal output from the first diode D1 to a base terminal through a first resistor R1 and according to the state of the signal. A transistor Q1 that operates on / off, a second diode D2 that receives and outputs a specific constant voltage Vcc converted from a commercial power source externally input, and a battery voltage (+ B) that generates a predetermined voltage ) Is jointly connected to the third diode (D3) for receiving and outputting, and the cathode terminal of the second diode (D2) and the third diode (D3) and the other end is connected to the collector terminal of the transistor (Q1). Connected During turn-on operation of the transistor Q1, the solenoid 2 for driving a valve for discharging the pressure generated inside the cooker by the voltage output through the diodes D2 and D3 and the third diode D3. One end is connected to the cathode terminal of the second resistor (R2) for receiving the output voltage of the third diode (D3) and the voltage applied to the other end of the second resistor (R2) to the anode terminal to receive the Ground potential when the voltage of the fourth diode (D4) applied to the cathode terminal of the first diode (D1) and the part where the anode terminal of the second resistor (R2) and the fourth diode (D4) are commonly connected are turned on Consists of lid lock detection switch (SW) to switch to.

At this time, the lid locking detection switch (SW) maintains the on-operation state in the state in which the lid of the pressure cooker is locked, the off operation in the state that the lid is released.

In addition, the third diode D3 of the configuration prevents the secondary constant voltage source + B from being discharged when the constant voltage source Vcc is supplied, and the second diode D2 is not supplied with the constant voltage source Vcc. If not, the auxiliary constant voltage source (+ B) is configured to prevent the flow to the constant voltage source (Vcc) side, the first diode (D1) and the fourth diode (D4) to prevent the collision between the control signal and the switch signal of the microcomputer. It is for.

Looking at the preferred operation of the drive circuit of the pressure relief device according to the present invention configured as described above are as follows.

Since the lid lock detection switch (SW) is in an off state after the user covers the lid of the rice cooker and operates the locking device, the battery resistor (+ B) output from the third diode (D3) is applied to the second resistor (R2). Through this to the anode terminal of the fourth diode (D4).

The fourth diode D4 outputs the voltage applied to the anode terminal to the cathode terminal. The voltage output from the fourth diode D4 is input to the base terminal of the transistor Q1 through the first resistor R1. Will be.

Accordingly, the transistor Q1 is turned on, and the solenoid 2 is operated by the battery voltage + B output from the third diode D3 to drive the solenoid valve to generate air pressure inside the cooker. To the outside.

Subsequently, when the user drives the locking device, the lid lock detection switch SW is switched to an on-operation state, and the battery voltage + B output from the third diode D3 is grounded through the second resistor R2. Turn on.

Therefore, the voltage applied to the base terminal for the turn-on / off operation of the transistor Q1 is made by the voltage generated by the microcomputer 1.

Since the above-described operation process is performed using a battery provided inside even in a situation where the initial power supply for cooking is not performed, user convenience may be increased.

In addition, when the user releases the lock device for checking whether or not to take the cooked contents during cooking, the lid lock detection switch SW detects this and switches to the off operation state so that the third diode D3 is detected. ) Is transferred to the base terminal of the transistor Q1 through the second resistor R2 and the fourth diode D4.

Accordingly, by performing the operation as described above, it is discharged to the outside at the pressure formed therein.

Providing a pressure discharge control device of the electric pressure cooker according to the present invention that operates as described above, if the power supply is not made by a specific reason during cooking, or if you want to remove the lid of the rice cooker or unavoidable of the cooker during cooking If the lid is to be removed, there is an effect of preventing the risk of a safety accident that can be caused by the excessive pressure formed inside.

Claims (4)

The transistors are turned on and off according to the state of the cooked object detected by the predetermined number of detection means and the control signal output from the microcomputer according to the pressure state inside the rice cooker, and the constant voltage source generated by the commercial power source. In an electric pressure cooker having a solenoid valve for discharging the pressure inside the cooker to the outside during the turn-on operation of the transistor by a driving voltage: an auxiliary constant voltage source different from the constant voltage source, the solenoid valve is a drive power source And a switching means for receiving a voltage generated by the constant voltage source and the auxiliary constant voltage source in common and opening and closing a path for transmitting the voltage generated by the auxiliary constant voltage source to the base terminal of the transistor. With locking device for securing lid to rice cooker Discharge pressure adjustment of the electric pressure cooker apparatus which is characterized in that the rebound motion. 2. The apparatus for controlling pressure release of an electric pressure cooker according to claim 1, wherein a diode is provided at a voltage output path of the constant voltage source and the auxiliary constant voltage source and a control signal output terminal of the microcomputer to prevent the inflow of smoke power. The pressure discharging control device of an electric pressure cooker according to claim 1, wherein the switching means maintains an on-operation state when the locking device is locked, and turns off when the locking device is released. A first diode (D1) for receiving and outputting a control signal of a predetermined state output from the microcomputer (1) according to the state of the cooked object detected through the predetermined number of detection means and the pressure state inside the rice cooker; A transistor (Q1) receiving a signal output from the first diode (D1) to a base terminal through a first resistor (R1) and turning on / off according to the state of the signal; A second diode D2 for receiving and outputting a specific constant voltage Vcc converted from a commercial power input from the outside; A third diode D3 for receiving and outputting a battery voltage + B for generating a predetermined voltage; One end is jointly connected to the cathode terminals of the second diode D2 and the third diode D3, and the other end is connected to the collector terminal of the transistor Q1, so that each turn-on operation of the transistor Q1 is performed. A solenoid 2 for driving a valve for discharging the pressure generated inside the cooker by the voltage output through the diodes D2 and D3; A second resistor R2 having one end connected to a cathode terminal of the third diode D3 and receiving an output voltage of the third diode D3; A fourth diode (D4) receiving a voltage applied to the other end of the second resistor (R2) to an anode terminal and applying a voltage to the cathode terminal of the first diode (D1); And in response to the locking device for switching the voltage of the part where the anode terminal of the second resistor (R2) and the fourth diode (D4) are commonly connected to the ground potential during the on-operation, and for operating the lid to the rice cooker. Pressure discharge adjusting device of the electric pressure cooker, characterized in that consisting of a lid locking detection switch (SW).

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