CN213780714U

CN213780714U - Intelligent cooking stove circuit adopting magnetic protection valve

Info

Publication number: CN213780714U
Application number: CN202120130316.8U
Authority: CN
Inventors: 肖玉振; 韦塘
Original assignee: Guangzhou Huiyuan Electronics Co ltd
Current assignee: Guangzhou Huiyuan Electronics Co ltd
Priority date: 2021-01-18
Filing date: 2021-01-18
Publication date: 2021-07-23
Anticipated expiration: 2031-01-18

Abstract

The utility model discloses an adopt magnetism to protect valve intelligence culinary art cooking utensils circuit, including MCU main control chip U1, drive circuit is protected with magnetism to pot temperature detection circuit, pot temperature probe NTC1 is through the temperature of a plurality of matching resistor subcircuits detection pots that can higher accuracy, and pot temperature probe NTC1 forms when standby state and opens circuit, it is not power consumptive, drive circuit is protected to magnetism and valve F1 is only being opened and closing just need the power consumption in the twinkling of an eye, a large amount of operation electric energy has been saved, this circuit adopts the dry battery to supply power, can realize intelligent upgrading under the current cooking utensils structure prerequisite not changing, the lower practicality of cost is strong.

Description

Intelligent cooking stove circuit adopting magnetic protection valve

Technical Field

The utility model relates to a cooking utensils circuit technical field, in particular to adopt magnetism to protect valve intelligence culinary art cooking utensils circuit.

Background

Traditional cooking utensils do not have unmanned on duty intelligent automatic cooking function. Even if a small part of cookers with intelligent cooking are controlled by a proportional valve, the proportional valve is high in cost and the matched electric control cost is high, particularly, because the operating power of the proportional valve is high and needs a power supply of more than 24V/1A, the electric cooker can only be powered by mains supply after voltage reduction, but because of historical and traditional reasons (common cookers all adopt dry batteries for power supply), a cooker socket is not reserved when many families decorate kitchens. The two factors cause great barriers to popularization and sale of the intelligent cooking stove, so that the stove is still the household appliance with the lowest intelligent popularization rate in kitchen household appliances.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an adopt valve intelligence culinary art cooking utensils circuit is protected to magnetism, including pot temperature detection circuit, its pot temperature probe NTC1 provides more reliable data through the temperature of a plurality of matching resistance subcircuits detection pot that can higher accuracy for intelligent culinary art, and pot temperature probe NTC1 forms when standby state and opens circuit, and is not power consumptive, has solved the not high problem of detection precision of current pot temperature probe. The cooker also comprises a magnetic protection driving circuit, and the magnetic protection valve F1 of the cooker needs to be powered only at the moment of opening and closing, so that a large amount of running electric energy is saved, and the problem that the conventional pot temperature probe or magnetic protection valve consumes much power is also solved.

To achieve the purpose, the utility model adopts the following technical proposal:

an intelligent cooking stove circuit adopting a magnetic protection valve comprises an MCU main control chip U1 and a pot temperature detection circuit;

a pin 1 of the MCU master control chip U1 is connected with a power supply;

the pot temperature detection circuit is provided with a pot temperature probe NTC1, one end of the pot temperature probe NTC1 is connected with a power supply, and the other end of the pot temperature probe NTC1 is connected with a resistor R28 and then connected with a pin 9 of an MCU main control chip U1; the connection point between the pot temperature probe NTC1 and the resistor R28 is connected with the resistor R29 and then connected with the pin 5 of the MCU main control chip U1; the connection point between the pot temperature probe NTC1 and the resistor R28 is connected with the resistor R30 and then connected with the 4 pins of the MCU main control chip U1.

From this, pot temperature probe NTC1 can detect the temperature of pot, and be equipped with corresponding resistance switching branch way, can switch different resistance according to the temperature section of difference, in order to improve the temperature acquisition precision, make cooking utensils can carry out the intelligent culinary art of different modes according to different temperatures, and simultaneously, when standby state, MCU main control chip U1's 4, 5, 9 feet all put the high level, make pot temperature probe NTC1 do not have the power supply circuit and form the outage, thereby reach the power saving and reduce the consumption mesh, the not high problem of detection precision of having solved current pot temperature probe, the power consumptive more problem of current pot temperature probe has also been solved.

In some embodiments, the magnetic protection driving circuit is provided with a magnetic protection valve F1, one end of the magnetic protection valve F1 is connected to pin 1 of the driving chip U2, the other end of the magnetic protection valve F1 is connected to pin 3 of the driving chip U2, a pin 6 resistor R4 of the driving chip U2 is connected to pin 16 of the MCU main control chip U1, and a pin 5 resistor R5 of the driving chip U2 is connected to pin 17 of the MCU main control chip U1.

Therefore, the magnetic protection valve F1 does not need to be powered during the maintenance period, is maintained by the built-in magnetic field of the magnet, and only needs to be powered at the opening and closing moment, thereby saving a large amount of running electric energy and solving the problem of more power consumption of the existing magnetic protection valve.

In some embodiments, the voltage of the power source is 3.3V and is provided by a dry cell battery.

Therefore, the dry battery is used as a power supply, and the use is convenient.

In some embodiments, the boost circuit further comprises a socket CN1 connected to a power supply, the pin 2 of the socket CN1 is connected to the inductor L1 and then connected to the pin 3 of the boost chip U3, the pin 2 of the boost chip U3 is an output terminal, the pin 2 of the boost chip U3 is connected to the capacitor EC1 and then connected to ground, and the pin 1 of the boost chip U3 is connected to ground.

Therefore, the socket CN1 is connected with a power supply such as a dry battery, the power supply is boosted through the boosting chip U3 after being output, and the power supply supplies power to corresponding circuit elements such as the MCU main control chip U1, the pot temperature detection circuit, the magnetic protection driving circuit and the like.

In some embodiments, the device further comprises an instruction input and display circuit, wherein the instruction input and display circuit comprises a plurality of touch keys, and each touch key is correspondingly connected to an input end of the MCU main control chip U1;

the instruction input and display circuit further comprises a digital screen DS1 and a plurality of indicator lamps, the digital screen DS1 and the indicator lamps are connected to the output end of the MCU main control chip U1, and the digital screen DS1 is in tower-shaped driving connection with the indicator lamps.

Therefore, a large number of I/O ports can be saved through the tower-type driving connection, a special digital screen driving chip is saved, more indicating lamps can be driven through few I/O ports, the circuit is simple, the power consumption of the circuit is reduced, and the cost is reduced.

In some embodiments, a thermocouple detection circuit and an extinction protection circuit are further included, and the thermocouple detection circuit and the extinction protection circuit can be connected through a magnetic protection valve F2.

Therefore, when overtemperature, fault and timing end occur, the MCU main control chip U1 actively outputs a low level to control the Q2, and the Q2 outputs reverse current to the secondary coil of the shutdown valve F2, so that the magnetic field of the primary coil is neutralized or counteracted, and the valve shutdown is realized.

In some embodiments, the thermocouple detection circuit comprises a comparator chip U4, and the output end of the comparator chip U4 is connected with a resistor R9 and then connected with a pin 6 of the MCU main control chip U1;

the inverting input end of the comparator chip U4 is connected with the resistors R7 and R8 and the thermocouple RDO, the non-inverting input end of the comparator chip U4 is connected with the anode of the diode DW1, and the cathode of the diode DW1 is connected with the connection point between the resistors R7 and R8.

Therefore, the thermocouple RDO can detect the temperature of the combustor, and the detected numerical value change is transmitted to the MCU main control chip U1 after passing through the comparator chip U4.

In some embodiments, the stall protection circuit includes a transistor Q2, a collector of the transistor Q2 is connected to a resistor R10 and then to a secondary winding of a stall protection valve F2;

the main coil of the quench valve F2 is connected to thermocouple RDO.

In some embodiments, the MCU control system further comprises a power supply voltage acquisition circuit, wherein an input end of the power supply voltage acquisition circuit is a + VPP end, and the + VPP end is connected to a resistor R31 and then connected to a pin 15 of the MCU main control chip U1.

In some embodiments, the intelligent MCU alarm circuit further comprises an alarm circuit, wherein the alarm circuit comprises a buzzer BUZ1, one end of the buzzer BUZ1 is connected with the + VPP end, the other end of the buzzer BUZ1 is connected with the collector of a triode Q1, and the base of the triode Q1 is connected with a resistor R3 and then connected with a pin 19 of the MCU main control chip U1.

Therefore, the buzzer BUZ1 can give out corresponding prompting sound or warning sound according to instruction input, mode switching, failure and other conditions.

The utility model has the advantages that: the pot temperature probe NTC1 of the pot temperature detection circuit can detect the temperature of the pot with higher precision through a plurality of matched resistance sub-circuits, and more reliable data is provided for intelligent cooking; and the pot temperature probe NTC1 forms an open circuit in the standby state without consuming power

In addition, the magnetic protection valve F1 of the magnetic protection driving circuit needs to be powered only at the opening and closing moments, so that a large amount of running electric energy is saved;

moreover, this circuit adopts the dry battery to supply power, when voltage is less than 2.1V, can close intelligent culinary art function, and ordinary cooking utensils function operation can still be maintained to the electric quantity that remains.

Drawings

FIG. 1 is a connecting structure diagram of the intelligent cooking stove circuit using the magnetic latching valve of the present invention;

FIG. 2 is a diagram of the connection structure of the pot temperature detection circuit and the magnetic protection driving circuit of the present invention;

FIG. 3 is a diagram of the connection structure of the command input and display circuit of the present invention;

FIG. 4 is a diagram of the thermocouple detection circuit, the flameout protection circuit, the power supply voltage acquisition circuit and the alarm circuit of the present invention;

fig. 5 is a structural diagram of the booster circuit of the present invention;

wherein: 1-pot temperature detection circuit; 2-thermocouple detection circuit; 3-a magnetic protection driving circuit; 4-a flameout protection circuit; 5-command input and display circuit; 6-a boost circuit; 7-a power supply voltage acquisition circuit; 8-alarm circuit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 to 5, an intelligent cooking stove circuit using a magnetic protection valve comprises an MCU main control chip U1 and a pot temperature detection circuit 1;

a pin 1 of the MCU master control chip U1 is connected with a power supply;

the pot temperature detection circuit 1 is provided with a pot temperature probe NTC1, one end of the pot temperature probe NTC1 is connected with a power supply, and the other end of the pot temperature probe NTC1 is connected with a resistor R28 and then connected with a pin 9 of an MCU main control chip U1; the connection point between the pot temperature probe NTC1 and the resistor R28 is connected with the resistor R29 and then connected with the pin 5 of the MCU main control chip U1; the connection point between the pot temperature probe NTC1 and the resistor R28 is connected with the resistor R30 and then connected with the 4 pins of the MCU main control chip U1.

Further, the magnetic protection driving circuit 3 is provided with a magnetic protection valve F1, one end of a magnetic protection valve F1 is connected to pin 1 of the driving chip U2, the other end of the magnetic protection valve F1 is connected to pin 3 of the driving chip U2, a pin 6 resistor R4 of the driving chip U2 is connected to pin 16 of the MCU main control chip U1, and a pin 5 resistor R5 of the driving chip U2 is connected to pin 17 of the MCU main control chip U1.

Further, the driver chip U2 may be M113, which may be a high current bridge driver chip.

Further, the voltage of the power source was 3.3V and was supplied by a dry cell.

Further, the boost circuit 6 is further included, the boost circuit 6 includes a socket CN1 connected to a power supply, a pin 2 of the socket CN1 is connected to the inductor L1 and then connected to a pin 3 of the boost chip U3, a pin 2 of the boost chip U3 is an output terminal, a pin 2 of the boost chip U3 is connected to the capacitor EC1 and then connected to the ground, and a pin 1 of the boost chip U3 is connected to the ground.

Further explaining, the device also comprises an instruction input and display circuit 5, wherein the instruction input and display circuit 5 comprises a plurality of touch keys, and each touch key is correspondingly connected with the input end of the MCU main control chip U1;

the instruction input and display circuit 5 further comprises a digital screen DS1 and a plurality of indicator lamps, the digital screen DS1 and the plurality of indicator lamps are connected to the output end of the MCU main control chip U1, and the digital screen and the plurality of indicator lamps are in tower-shaped driving connection.

Further, the touch keys include keys K1-K5, which are an AI cooking key, a decrease key, an increase key, a timing key and a temperature setting key, respectively, and can input different cooking modes, and the five keys are respectively connected to 10 pins to 14 pins of the MCU main control chip U1.

Further, the digital screen DS1 and a plurality of indicator lamps are in tower-shaped driving connection with pins 21-28 of the MCU main control chip U1, the digital screen DS1 is four-position 8-shaped, and the indicator lamps are provided with 9 LED lamps.

Further, the flame-out protection circuit also comprises a thermocouple detection circuit 2 and a flame-out protection circuit 4, and the thermocouple detection circuit 2 and the flame-out protection circuit 4 can be connected through a magnetic protection valve F2.

Further, the thermocouple detection circuit 2 comprises a comparator chip U4, and the output end of the comparator chip U4 is connected with a resistor R9 and then connected with a pin 6 of the MCU main control chip U1;

Further illustrated, a thermocouple RDO is provided in the burner region.

Further, the flameout protection circuit 4 comprises a transistor Q2, wherein the collector of the transistor Q2 is connected with a resistor R10 and then connected with the secondary coil of the flameout protection valve F2;

the main coil of the quench valve F2 is connected to thermocouple RDO.

Further, the MCU master control circuit further comprises a power supply voltage acquisition circuit 7, wherein the input end of the power supply voltage acquisition circuit 7 is a + VPP end, and the + VPP end is connected with a resistor R31 and then connected with a pin 15 of the MCU master control chip U1.

Further, the 2 pin of the jack of the boost circuit 6 is connected to the + VPP terminal.

Further explaining, the warning sound circuit 8 is further included, the warning sound circuit 8 comprises a buzzer BUZ1, one end of the buzzer BUZ1 is connected with the + VPP end, the other end of the buzzer BUZ1 is connected with the collector of a triode Q1, and the base of the triode Q1 is connected with a resistor R3 and then connected with a pin 19 of the MCU main control chip U1.

The working principle is as follows:

this circuit includes MCU main control chip U1, pot temperature detection circuit 1, thermocouple detection circuit 2, magnetism protects drive circuit 3, flame-out protection circuit 4, instruction input and display circuit 5, boost circuit 6 and mains voltage acquisition circuit 7 constitute, wherein this circuit is by 3.3V voltage supply, preferably regard as the power with the dry battery, and boost through boost circuit 6 and form stable 3.3V voltage, mains voltage acquisition circuit 7 can regard as the collection mouth with + VPP end, gather and monitor mains voltage numerical value, show low-power when voltage is less than 2.1V, and can close partial intelligent culinary art function, avoid the electric quantity not enough to cause the culinary art risk, promote intelligent degree.

The circuit is applied to a cooker, the cooker is provided with a burner, the burner is divided into an outer ring fire burner and an inner ring fire burner, a plug valve, a blowout protection valve F2 and a magnetic protection valve F1 are arranged on an air passage of the cooker, and a pot temperature probe NTC1 and a thermocouple RDO are arranged in the burner region.

The pot temperature probe NTC1 of the pot temperature detection circuit 1 is provided with three output sub-circuits, each sub-circuit is respectively provided with three resistors R28, R29 and R30, and is respectively connected to

pins

9, 5 and 4 of the MCU main control chip U1.

The pot temperature probe NTC1 can monitor the real-time cooking temperature of pot, and resistance R29 and R30 form two sub-circuits matching the resistance switching port respectively, switch different resistances according to different temperature sections, thereby improving the temperature acquisition precision. For example, in a low-temperature section from-20 ℃ to +80 ℃, the conduction of the pin 4 of the MCU main control chip U1 is set to be low, the pin 5 of the MCU main control chip U1 is high-resistance, the matching resistor R29 does not work, only the R30 works, the high-precision detection of the low-temperature section is realized, and the open-circuit fault of the boiler temperature probe NTC1 is detected. In a high-temperature section from +80 ℃ to +350 ℃, the conduction of the pin 4 of the MCU master control chip U1 is set to be low, the conduction of the pin 5 of the MCU master control chip U1 is also set to be low, the matching resistors R29 and R30 play a role simultaneously, the high-precision detection of the high-temperature section is realized, and the short-circuit fault of the boiler temperature probe NTC1 is detected. In addition, in a standby state, the three interfaces of

pins

4, 5 and 9 of the MCU main control chip U1 are set to high level (1) at the same time, so that the pot temperature probe NTC1 is powered off without a power supply loop, thereby achieving the purpose of saving power and reducing power consumption.

Pot temperature probe NTC1 can the temperature of the detection pot of higher accuracy, can carry out the setting of multiple culinary art mode according to this detection temperature, realize intelligent culinary art.

The magnetic protection driving circuit 3 comprises a magnetic protection valve F1 and a driving chip U2, pins 16 and 17 of an MCU main control chip U1 are control ports of the driving chip U2 and control the opening and closing of the magnetic protection valve F1, when the levels of the

pins

16 and 17 of the MCU main control chip U1 are respectively 0 and 1, the driving chip U2 drives the magnetic protection valve F1 to open and maintain, and when the levels of the

pins

16 and 17 of the MCU main control chip U1 are respectively 1 and 0, the driving chip U2 drives the magnetic protection valve F1 to close and maintain. During the sustain period, the levels of

pins

16 and 17 of the MCU master chip U1 are 0 and 0, respectively, i.e., no current is output from

pins

1 and 3 of the driver chip U2.

The magnetic protection valve F1 is also called a bistable valve, and has the characteristics that the valve is different from the self-sucking valve which is used in large quantity at present and needs power supply, the valve does not need power supply during the maintenance period, the valve is maintained by a built-in magnet magnetic field, and the valve only needs power supply in short time of opening and closing, thereby saving a large amount of running electric energy and being particularly important for battery power supply products.

The driving chip U2 is a high-current bridge driving chip, and the

pins

5 and 6 of the driving chip U2 receive different level states, so that the

pins

1 and 2 of the driving chip U2 output reversible driving current to drive the magnetic latching valve F1 to open and close.

The comparator chip U4 is a high-precision comparator chip, and can detect mV level signals of the thermocouple RDO to realize level inversion and output to 6 pins of the MCU main control chip U1, so that the flame combustion state can be monitored in real time.

The boost chip U3 is a DC-DC boost chip, and realizes the boosting and stabilizing of the battery voltage between 1.5V and 3.3V to 3.3V, so as to supply power for each chip and ensure the stable and reliable operation of the circuit.

The circuit realizes intelligent upgrading on the premise of not changing the structure of the existing cooker, can adopt 2 batteries (3V) for power supply, has low cost and strong practicability, and is particularly applied to the field of kitchen products with the requirement of unattended cooking.

What has been disclosed above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. An intelligent cooking stove circuit adopting a magnetic protection valve is characterized by comprising an MCU (microprogrammed control Unit) main control chip U1 and a pot temperature detection circuit (1);

a pin 1 of the MCU main control chip U1 is connected with a power supply;

the pot temperature detection circuit (1) is provided with a pot temperature probe NTC1, one end of the pot temperature probe NTC1 is connected with a power supply, and the other end of the pot temperature probe NTC1 is connected with a resistor R28 and then connected with a pin 9 of an MCU main control chip U1; the connecting point between the pot temperature probe NTC1 and the resistor R28 is connected with the resistor R29 and then connected with the pin 5 of the MCU main control chip U1; and a connection point between the pot temperature probe NTC1 and the resistor R28 is connected with the resistor R30 and then connected with 4 pins of the MCU main control chip U1.

2. The intelligent cooking stove circuit adopting the magnetic protection valve as claimed in claim 1, further comprising a magnetic protection driving circuit (3), wherein the magnetic protection driving circuit (3) is provided with a magnetic protection valve F1, one end of the magnetic protection valve F1 is connected to 1 pin of a driving chip U2, the other end of the magnetic protection valve F1 is connected to 3 pins of the driving chip U2, a 6-pin resistor R4 of the driving chip U2 is connected to 16 pins of an MCU main control chip U1, and a 5-pin resistor R5 of the driving chip U2 is connected to 17 pins of the MCU main control chip U1.

3. An intelligent cooking stove circuit with a magnetic protective valve according to claim 1 or 2, characterized in that the voltage of the power supply is 3.3V and is provided by dry batteries.

4. The intelligent cooking stove circuit adopting the magnetic protection valve as claimed in claim 3, further comprising a voltage boosting circuit (6), wherein the voltage boosting circuit (6) comprises a socket CN1 connected with a power supply, a pin 2 of the socket CN1 is connected with a pin 3 of a voltage boosting chip U3 after being connected with an inductor L1, a pin 2 of the voltage boosting chip U3 is an output end, a pin 2 of the voltage boosting chip U3 is connected with a capacitor EC1 and then is grounded, and a pin 1 of the voltage boosting chip U3 is grounded.

5. The intelligent cooking stove circuit adopting the magnetic latching valve as claimed in claim 1, further comprising an instruction input and display circuit (5), wherein the instruction input and display circuit (5) comprises a plurality of touch keys, and each touch key is correspondingly connected to an input end of the MCU main control chip U1;

the instruction input and display circuit (5) further comprises a digital screen DS1 and a plurality of indicator lamps, the digital screen DS1 and the indicator lamps are connected to the output end of the MCU main control chip U1, and the digital screen DS1 is in tower-shaped driving connection with the indicator lamps.

6. The intelligent cooking stove circuit with the magnetic protective valve according to claim 1, characterized by further comprising a thermocouple detection circuit (2) and a flameout protection circuit (4), wherein the thermocouple detection circuit (2) and the flameout protection circuit (4) can be connected through the magnetic protective valve F2.

7. The intelligent cooking stove circuit with the magnetic protection valve according to claim 6, characterized in that the thermocouple detection circuit (2) comprises a comparator chip U4, and the output end of the comparator chip U4 is connected with a resistor R9 and then connected with the 6 pins of an MCU main control chip U1;

the inverting input end of the comparator chip U4 is connected with the resistors R7 and R8 and the thermocouple RDO, the non-inverting input end of the comparator chip U4 is connected with the anode of a diode DW1, and the cathode of the diode DW1 is connected with the connection point between the resistors R7 and R8.

8. An intelligent cooking stove circuit with a magnetic protection valve according to claim 7, characterized in that the extinguishing protection circuit (4) comprises a transistor Q2, the collector of the transistor Q2 is connected with a resistor R10 and then connected with the secondary coil of an extinguishing valve F2;

the main coil of the quench valve F2 is connected to thermocouple RDO.

9. The intelligent cooking stove circuit with the magnetic protection valve according to claim 1, further comprising a power supply voltage acquisition circuit (7), wherein an input end of the power supply voltage acquisition circuit (7) is a + VPP end, and the + VPP end is connected with a resistor R31 and then connected with a pin 15 of an MCU main control chip U1.

10. The intelligent cooking stove circuit adopting the magnetic protection valve as set forth in claim 1, further comprising a warning circuit (8), wherein the warning circuit (8) comprises a buzzer BUZ1, one end of the buzzer BUZ1 is connected to the + VPP end, the other end of the buzzer BUZ1 is connected to the collector of a triode Q1, and the base of the triode Q1 is connected with a resistor R3 and then connected to the 19 pins of the MCU main control chip U1.