Intelligent device for automatically switching off a cooking appliance when the user is absent from the cooking area for an extended period of time.

Abstract

Reliable device for automatically switching off a cooking appliance when the user is absent from the cooking area for an extended period of time, characterized in that it comprises: 3 ultrasonic sensors (CM), 1 gas flow detector (DG), 1 gas solenoid valve (VE), 1 buzzer (Bz), 1 power relay (19), 5 switching relays (29, 39, 60, 49, 59), 1 microcontroller (6), 1 current transformer (18), 1 diode bridge (16), 1 voltage transformer (17), 1 battery charging circuit (27), 1 12V battery (20), resistors and 2 capacitors (C21, C22), 2 changeover switches (C1, C2), 1 push button (S1) and transistors, etc.). The aforementioned elements work together to automatically shut off the gas supply between the household gas connection (gas cylinder) and the gas oven, and between the 220V mains supply and the electric hob, when the user is absent from the cooking area or in front of their cooking appliance for an extended period of time.

Description

[0001] The present invention relates to an intelligent device that enables a cooking appliance to be switched off whenever the user is absent from the cooking area or in front of the appliance for an extended period of time. This is intended to avoid certain risks associated with forgetfulness (burning or charring of food or dishes, production of additional smoke or fumes in a dwelling). State of the art

[0002] Devices are known in the prior art for switching off cooking appliances upon smoke detection or gas leaks, as well as electronic or mechanical timers for programming the end of the cooking time. These devices include thermostats, electronic and mechanical timers, and solenoid valves, but they cannot switch off the cooking appliances every time the user is absent from the cooking area for an extended period, nor can they emit an audible alarm to remind the user that the cooking appliance is still in operation. Purpose of the invention

[0003] The purpose of this invention is to create a system that makes it possible to emit an acoustic signal every 10 or 15 minutes when no one is in the cooking area, each time the cooking appliance (gas oven or electric hob) is in operation; and optionally to switch off the cooking appliance if no one has returned to the cooking area, even for a single second; or the purpose is to switch off the cooking appliance if the user has actually been absent from the cooking area for more than 15 or 20 minutes if the cooking appliance has been in operation. Overall, the aim is to create a system that compels the user to return to the cooking area at regular intervals to ensure the success of their cooking process (e.g., to check on the food).to check if the water has evaporated, and other things); to avoid certain risks associated with forgetfulness (burning or charring of food or its dish, production of additional smoke or steam in a dwelling, which can sometimes trigger smoke alarm systems). Brief description of the drawings Fig. Figure 1 is a schematic representation of the device. According to the invention, a mechanical part consisting of 1 solenoid valve for gas (EV), 1 detector for gas flow or gas flow sensor (DG), and an electronic part consisting of 1 microcontroller (6), 3 ultrasonic sensors (CM), a power relay (19), 5 switching relays (29, 39, 60, 49, 59), a buzzer (BZ), 1 current transformer (18), 10 transistors, 18 resistors, 1 diode bridge (16), 1 voltage transformer (17), 1 battery (20), 1 voltage regulator (27), 2 changeover switches (C1, C2), 1 push button (S1), etc. Commercial applicability

[0004] The device according to the invention is intended in particular for all natural or legal persons who use gas and electric cooktops in households, restaurants, hotels, etc. Detailed description of the device

[0005] The device is connected to the mains power supply via the 220 V mains plug with earth (26) and has an output socket (PT) for supplying the electric hob (EC), an output socket (PV) for supplying the gas solenoid valve (EV), an input socket (PD) for receiving the signal from the sensor or counter of the gas flow (DG), 03 ultrasonic sensors (CM) installed in the device, 01 buzzer (BZ) installed in the device, and it includes an electronic circuit board.The other components installed on the electronic circuit board are powered by a DC voltage (VCC) of 5V and by another DC voltage (vvv) of 12V to supply the solenoid valve (VE); the voltage is supplied by the 380V / 16V transformer (17), rectified by a diode bridge (16), filtered by a capacitor and regulated by the 5V voltage regulator (27), the current transformer (18) is connected in series to one of the supply conductors of the electric cooktop (EC), a power relay (19) with its normally closed contacts is connected in series to the O2 conductors of the supply conductors of the electric cooktop (EC); the output voltage of the secondary circuit of the current transformer (18) is connected to the input (T2) of the microcontroller (6).The microcontroller outputs (T5, T8, T1) are connected to the bases of the transistors (B6, B60, B13, B15). The signal outputs of the three ultrasonic sensors (CM) are connected to the microcontroller inputs (T6, T6, T6) of the microcontroller. The normally closed contact of relay (60) shorts capacitor (C21). The switch (C2) allows selection of the cooking appliance type. The TEC position is for the electric cooktop, and the TFG position is for the gas oven. The push button (S1) restarts the gas oven after automatic shutdown. The signal input from a gas flow detector or gas flow sensor (DG) is connected to input (T7) of the microcontroller. Input (T9) of the microcontroller is connected to the midpoint of a resistor (R20) and capacitor (C21), which are connected in series.The output (T4) of the microcontroller is connected to the base of a transistor (B20) to control the buzzer (BZ). A battery charging circuit (27) is connected to the output of the diode bridge (16) and charges the 12V battery (20) each time the device is powered. The normally closed contacts of the relay (39) (mounted in parallel with relays (29) and (19)) supply the solenoid valve with the 12V voltage (VVV) provided by the transformer (17) or by the battery (20), which recharges each time the device is powered. Rotating the toggle switch (CI) allows the user to change the capacitor charging time or the personalized shut-off time when the user is absent from the cooking area (position A1 = 15 minutes / position A2 = 30 minutes). Control of the shutdown of the electric hob

[0006] As soon as the user switches on the electric hob, the voltage received from the secondary circuit of the current transformer (18) supplies the input (T2); after analysis, the microcontroller sends a positive voltage of 5V to its output pin (T5) to saturate the transistor (B60), consequently the relay (60) is energized and opens its normally closed contact, then the capacitor (C21), which is connected in series with resistors R20 or R21, begins to charge, and each time the voltage at the terminals of the capacitor or at the input (T9) of the microcontroller reaches 3V, the microcontroller sends a positive voltage to its output (T4) to saturate the transistor (B20), consequently the buzzer (BZ) is activated and when this voltage at the input (T9) of the microcontroller simultaneously reaches 4.5V, the microcontroller removes the voltage at its output (T4) to stop the buzzer.and sends a positive voltage of 5V to its output (T8) to saturate transistor (B6), and transistor (B6) in turn saturates transistor (B11), consequently the parallel-connected relays (19 and 29) are supplied with a voltage VCC of 5V; the closing of the normally open contacts of relay (29) saturates transistor (B11) a second time, thus ensuring its self-holding, and the second normally open contact of relay (29) shorts capacitor (C21) to prevent it from charging, thus canceling the voltage (T9) at the microcontroller input, and the opening of the normally closed contacts of relay (19), when it is energized, leads to the interruption of the 220V supply to the electric cooktop (EC). The programming is designed so that every time a person is in the cooking area or every time one of the ultrasonic sensors 1, 2 or 3 (CM) detects the presence of a person in the cooking area,The microcontroller receives signals at its inputs (T6, T6, T6) and, after processing, sends a positive voltage to its output (T1) to simultaneously saturate transistors (B13 and B15). Transistor (B13) then blocks the charging of capacitor (C21) or sets the voltage at the microcontroller's input (T9) to 0V. Transistor (B15) saturates transistor (B50), which in turn blocks transistor (B11) to maintain the blocking of relays (29 and 19). Rotating the toggle switch (CI) allows the user to change the capacitor charging time or the personalized shut-off time when the user is absent from the cooking area (position A1 = 15 minutes / position A2 = 30 minutes). Controlling the gas oven shut-off: Once the device is energized, the solenoid valve coil (EV) is energized with a voltage (VVV) of 12V via the normally closed contacts of the Relay (39) is supplied, and as soon as the user switches on the gas oven,The microcontroller's input (T7) receives a positive voltage from the gas flow detector or gas flow sensor (DG). After processing, the microcontroller sends a positive voltage of 5V to its output pin (T5) to saturate transistor (B60). Consequently, relay (60) is energized and opens its normally closed contact. Then, capacitor (C21), connected in series with resistor R20 or R21, begins to charge. Each time the voltage at the capacitor terminals or at the microcontroller's input (T9) reaches 3V, the microcontroller sends a positive voltage to its output (T4) to saturate transistor (B20). Consequently, the buzzer (BZ) is activated. When this voltage at the microcontroller's input (T9) reaches 4.5V, the microcontroller simultaneously reduces the voltage at its output (T4) to stop the buzzer and sends a positive voltage of 5V to its output (T8).To saturate transistor (B6), and transistor (B6) in turn saturates transistor (B11), then the parallel-connected relays (39 and 29) are supplied with a voltage of 5V from VCC; the closing of the normally open contacts of relay (29) saturates transistor (B11) a second time, thus ensuring its latching, and the second normally open contact of relay (29) shorts capacitor (C21) to prevent it from charging, thus canceling the voltage (T9) at the microcontroller input. Energizing relay (39) interrupts the 12V supply to the solenoid valve (EV) (closing the gas valve).

[0007] The programming is such that whenever a person is in the cooking area, or whenever one of the ultrasonic sensors 1, 2, or 3 (CM) detects a person's presence in the cooking area, the microcontroller receives signals at its inputs (T6, T6, T6) and, after analysis, outputs a positive voltage at its output (T1) to saturate transistors (B13 and B15). Consequently, transistor (B13) either blocks, discharges capacitor (C21), or sets the voltage at the microcontroller's input (T9) to 0V. Transistor (B15) then saturates transistor (850), which in turn blocks transistor (B11). The voltage at the terminals of relay (39) becomes or remains zero, thus keeping the gas solenoid valve powered. Rotating the toggle switch (CI) allows the user to change the capacitor charging time or the personalized shutdown time when the user is absent from the cooking area (position A1 = 15 minutes / position A2 = 30 minutes). Control of the gas oven reset after an automatic shutdown

[0008] Pressing the button (S1) when the oven's gas valve is closed energizes the relay (49), which then closes its normally open contact, thus energizing the solenoid valve (EV). The relay (49) then opens its normally closed contact, causing the capacitor (C22), connected in series with the resistor (R3), to begin charging. After 0.3 seconds, the transistor (B51) becomes saturated and in turn saturates the transistor (B52). Consequently, the relay (59) is energized, and its normally open contact blocks the transistor (B11) to reset the entire system.

[0009] Pressing the button (S1) when the oven's gas valve is open energizes the relay (49), which then closes its normally open contact, thus energizing the solenoid valve (EV). The gas flow for 0.3 seconds in the connecting hose is detected by the gas flow sensor (DG), which sends a positive voltage KT to saturate the transistor (B53). This, in turn, blocks the transistor (B51), so relay (59) remains in its initial position. As relay (39) remains energized, the solenoid valve (EV) remains unpowered, and the gas oven remains disconnected from the gas supply or gas cylinder, or blocked.

Claims

[1] Reliable device for automatically switching off a cooking appliance when the user is absent from the cooking area for a longer period of time, characterized by , that it comprises: 3 ultrasonic sensors (CM), 1 gas flow detector (DG), 1 gas solenoid valve (VE), 1 buzzer (Bz), 1 power relay (19), 5 switching relays (29, 39, 60, 49, 59), 1 microcontroller (6), 1 current transformer (18), 1 diode bridge (16), 1 voltage transformer (17), 1 battery charging circuit (27), 1 12V battery (20), resistors and 2 capacitors (C21, C22), 2 changeover switches (C1, C2), 1 push button (S1) and transistors, etc.). The aforementioned components work together to automatically shut off the gas supply between the household gas connection (gas cylinder) and the gas oven, and between the 220V mains power supply and the electric cooktop, when the user is absent from the cooking area or in front of their cooking appliance for an extended period. [2] Device according to claim 1, characterized by, that for a direct connection the voltage of the 220 V mains supply and the electric hob (EC) are in contact via the normally closed contacts of the power relay (19) or when the electric hob is under voltage. [3] Device according to claim 1, characterized by, that if the electric hob (EC) is in operation when no one is in the cooking area or in the fields of the ultrasonic sensors; The voltage generated by the secondary circuit of the current transformer (18), whose primary circuit is connected in series to one of the supply conductors of the electric hob (EC), supplies the input (T2) of the microcontroller; After conditioning, the microcontroller sends a positive voltage of 5V to its output (T5) to saturate the transistors (B60), consequently the relay (60) is energized and the capacitor (C21) begins to charge via the resistor (R20 or R21) and the progressive charging voltage at the terminals of the capacitor supplies the input (T9) of the microcontroller and if this voltage (T9) is 3V, the microcontroller, after analysis, sends a positive voltage to its output (T4) to activate the buzzer (BZ) and if this voltage (T9) reaches 4.5V, the microcontroller cancels the voltage (T4),Consequently, the buzzer (BZ) stops and the microcontroller sends a positive voltage to its output (T8) to saturate the transistors (B6 and B11), and the parallel-connected relays (19 and 29) are energized. As a result, relay (19) interrupts the 220 V supply to the electric hotplate (EC), and relay (29) shorts the capacitor (C21) and again saturates transistor (B11), thus ensuring its self-holding; in this case, the electric hotplate is disconnected from the mains power supply. [4] Device according to claim 1, characterized by , that for a direct connection the mains voltage of the 220 V mains supply and the electric cooktop (EC) are in contact via the normally closed contacts of the power relay (19). [5] Device according to claim 1, characterized by, that if one of the ultrasonic sensors (CM) detects the presence of a person in the cooking area; The signals transmitted by the ultrasonic sensors to the inputs (T6, T6, T6") of the microcontroller are processed by the microcontroller and, after analysis, the microcontroller sends a positive voltage to its output (T1) to simultaneously saturate the transistors (B13, B50) so that (B13) short-circuits the capacitor (C21) or prevents its charging, and transistor (B50) blocks transistor (B11) to prevent the relays (19, 29) from being energized; In this case, the electric cooktop remains connected to the mains power supply. [6] Device according to claim 2, characterized by , that the solenoid valve (EV) is supplied with a voltage of 12 V as soon as the device is powered on. [7] Device according to claim 2, characterized by, that if the gas hob (FG) is in operation or in the absence of a person in the cooking area or in front of the ultrasonic sensors; the signals or pulses sent by the gas flow sensor (DG) to the input (T7) of the microcontroller are analyzed by the microcontroller and, after processing, the microcontroller sends a positive voltage of 5V to its output (T5) to saturate the transistor (B60), consequently energizing the relay (60), causing the capacitor (C21) to begin charging through the resistor (R20 or R21), and the progressive charging voltage at the capacitor terminals supplies the input (T9) of the microcontroller, and if this voltage (T9) reaches 0.3V, the microcontroller, after analysis, sends a positive voltage to its output (T4) to activate the buzzer (BZ), and if this voltage (T9) reaches 4.5V, the microcontroller cancels the voltage at its output (T4), consequently stopping the buzzer.The microcontroller sends a positive voltage to its output (T8) to saturate the transistors (B6 and B11), and the relays (29, 39) are energized, and via its normally open contacts, relay (29) shorts the capacitor (C21) and again saturates transistor (B11), thus ensuring its self-holding; in this case, the gas oven is disconnected from the gas supply or the gas supply is blocked. [8] Device according to claim 2, characterized by, that if one of the ultrasonic sensors (CM) detects the presence of a person in the cooking area or in front of the cooking appliance; the signals transmitted by the ultrasonic sensors to the inputs (T6, T6, T6") of the microcontroller are processed by the microcontroller and, after analysis, the microcontroller sends a positive voltage to its output (T1) to saturate the transistors (B13 and B15), so that transistor (B13) short-circuits the capacitor (C21) or prevents its charging, and transistor (B15) saturates and blocks transistor (B50), and transistor (B50) in turn blocks transistor (B11) to prevent the relays (29, 39) from being energized or to maintain the supply to the solenoid valve (EV); in this case, the gas oven remains connected to the gas supply. [9] Device according to claim 3, characterized by that the solenoid valve (EV) has automatically interrupted the gas supply to the gas oven. [10] Device according to claim 3, characterized by , that if the solenoid valve (EV) has shut off the gas and if the gas tap is closed; actuation of the push button (S1) energizes the relay (49) and the relay (49) closes its normally open contact, consequently the solenoid valve (EV) is energized; the relay (49) opens its normally closed contact, consequently the capacitor (C22), which is connected in series with the resistor (R3), begins to charge, and after 0.3 seconds the transistor (B51) is saturated and in turn saturates the transistor (B52), consequently the relay (59) is energized and through its normally open contact the relay (59) blocks the transistor (B11) to reset the entire system. [11] Device according to claim 3, characterized by that the solenoid valve (EV) has automatically interrupted the gas supply to the gas oven. [12] Device according to claim 3, characterized by, that if the solenoid valve (EV) has shut off the gas and if the gas tap is open; pressing the button (S1) energizes the relay (49) and the relay (49) closes its normally open contact, consequently the solenoid valve (EV) is energized; the flow of gas for 0.3 seconds in the connecting hose will rotate the gas flow sensor (DG) and it will send a positive voltage KT to saturate the transistor (B53), and in turn the transistor (B53) will block the transistor (B51), consequently the relay (59) remains in its initial position; the relay (39) remains energized, consequently the solenoid valve (EV) remains not supplied or the gas oven remains disconnected from the gas supply or gas cylinder or blocked.

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