CN213843815U

CN213843815U - Proportional valve control circuit and controller for gas stove and gas stove

Info

Publication number: CN213843815U
Application number: CN202022604047.2U
Authority: CN
Inventors: 钱意; 万晨; 周定冰
Original assignee: Shenzhen Huowang Gas Appliance Co ltd
Current assignee: Shenzhen Huowang Gas Appliance Co ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-07-30
Anticipated expiration: 2030-11-11

Abstract

The utility model provides a proportional valve control circuit, controller and gas-cooker for gas-cooker, proportional valve control circuit includes: the adjusting module comprises a triode, an MOS (metal oxide semiconductor) tube, a voltage stabilizing diode unit and a protective resistance unit; the amplifying module comprises a comparator, wherein the positive power supply end of the comparator is connected with a second power supply source, the negative power supply end of the comparator is connected with the system ground, the reverse input end of the comparator is connected with the second end of the proportional valve, and the forward input end of the comparator is used for being connected with the control center of the gas stove; the feedback module comprises a feedback resistance unit, and two ends of the feedback resistance unit are respectively connected with the second end of the proportional valve and the system ground; and the negative electrode of the freewheeling diode is connected between the first end of the proportional valve and the drain electrode of the MOS tube, and the positive electrode of the freewheeling diode is connected to the system ground. The utility model discloses can make the gas-cooker adjust the gas firepower accurately at the culinary art in-process, improve the taste and the color and luster of cooked food.

Description

Proportional valve control circuit and controller for gas stove and gas stove

Technical Field

The utility model relates to a gas-cooker technical field, concretely relates to proportional valve control circuit, controller and gas-cooker for gas-cooker.

Background

The gas stove is mainly characterized in that gas such as liquefied petroleum gas, artificial gas and natural gas is used for heating, the gas enters the stove from a gas inlet pipe, enters a stove head through the adjustment of a gas valve, mixes a part of air, and the mixed gas is sprayed out through an inner ring flame path and an outer ring flame path respectively and is combusted.

In the existing gas stove, the opening degree of a gas valve is adjusted through a mechanical knob and other structures, the air inflow is adjusted through manual operation and is too rough, and with the continuous improvement of the taste, color and luster and the like of dishes, people often want to cook dishes according to the cooking method of a cook, although different prompts are provided for the firepower in some navigation recipes, the firepower is difficult to reach during manual operation, and the firepower is adjusted too rough, so that the cooking grade taste is difficult.

SUMMERY OF THE UTILITY MODEL

Based on above-mentioned current situation, the utility model discloses a main aim at provides a proportional valve control circuit, controller and gas-cooker for gas-cooker to realize the culinary art in-process and accurately adjust the gas firepower, improve the taste and the color and luster of cooked food.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model discloses a first aspect provides a proportional valve control circuit for gas-cooker, the gas-cooker has the controllable electromagnetism proportional valve of aperture, include:

the adjusting module comprises a triode, an MOS (metal oxide semiconductor) tube, a voltage stabilizing diode unit and a protective resistance unit, wherein two ends of the protective resistance unit are connected with two ends of the voltage stabilizing diode unit and a source electrode and a grid electrode of the MOS tube, one end connected with the source electrode is connected with a first power supply source, and the other end connected with the grid electrode is connected with a collector electrode of the triode; the drain electrode of the MOS tube is connected with the first end of the electromagnetic proportional valve; the emitter of the triode is connected with the system ground, and the base of the triode is connected with the output end of the amplification power supply;

the amplifying module comprises a comparator, wherein the positive power supply end of the comparator is connected with a second power supply source, the negative power supply end of the comparator is connected with the system ground, the reverse input end of the comparator is connected with the second end of the electromagnetic proportional valve, and the forward input end of the comparator is used for being connected with the control center of the gas stove;

and the feedback module comprises a feedback resistance unit, and two ends of the feedback resistance unit are respectively connected with the second end of the electromagnetic proportional valve and the system ground.

And the negative electrode of the freewheeling diode is connected between the first end of the electromagnetic proportional valve and the drain electrode of the MOS tube, and the positive electrode of the freewheeling diode is connected to the system ground.

Preferably, the zener diode unit includes a first zener diode and a second zener diode, an anode of the first zener diode is connected to an anode of the second zener diode, and cathodes of the first zener diode and the second zener diode are respectively connected to two ends of the protection resistance unit.

Preferably, the protection resistance unit includes a first resistance and a second resistance connected in parallel.

Preferably, the feedback resistance unit includes a third resistance and a fourth resistance arranged in series.

Preferably, the feedback module further includes a fifth resistor and a sixth resistor connected in series, two ends of the fifth resistor and the sixth resistor connected in series are respectively connected to the second end of the electromagnetic proportional valve and the second power supply, and the inverting input end of the comparator is connected between the fifth resistor and the sixth resistor.

Preferably, the amplifying module further includes a first filter capacitor, a second filter capacitor, a third filter capacitor, a first current limiting resistor, and a pull-up resistor, where the first filter capacitor is connected between the positive input end of the comparator and the system ground; the second filter capacitor is connected between the negative input end of the comparator and the system ground, and the third filter capacitor is connected between the second power supply and the positive power supply end of the comparator; the pull-up resistor is connected between the output end of the comparator and a second power supply; the first current limiting resistor is connected between the control end of the electromagnetic proportional valve and the positive input end of the comparator.

Preferably, the adjusting module further includes a second current limiting resistor and a third current limiting resistor, and the second current limiting resistor is connected between the output end of the amplifying module and the base of the triode; the third current limiting resistor is connected between the collector of the triode and the grid of the MOS tube.

A second aspect of the utility model provides a controller for gas-cooker, the gas-cooker has the controllable electromagnetism proportional valve of aperture, a serial communication port, the controller include control center and according to any one of the aforesaid electromagnetism proportional valve control circuit, control center has proportional valve control port, among the proportional valve control circuit the positive input of comparator with proportional valve control port connects, and is used for right the aperture of electromagnetism proportional valve is controlled.

Preferably, the control center further comprises a stop valve control port, a flame detection port, a touch display port and a wireless signal acquisition port;

the controller further includes:

the stop valve control circuit is connected with the stop valve control port to control the on-off of the stop valve;

the flame detection control circuit is connected with the flame detection port so as to transmit the flame detection result to the control center;

the touch display driving circuit is connected with the touch display port and used for controlling the touch display screen to work and transmitting a touch instruction of the touch display screen to the control center;

the wireless module is connected with the wireless signal acquisition port through a wireless signal acquisition port, and the control center can acquire the temperature information of cooked food through a wireless communication signal and control the touch display screen to display the temperature information.

A third aspect of the utility model provides a gas stove, including the top of a kitchen range with install in the combustor of top of a kitchen range, the combustor has the controllable electromagnetism proportional valve of aperture, a serial communication port, the gas stove still includes according to the aforesaid the controller.

In the utility model, on the first hand, the combination of the triode and the MOS tube is adopted in the adjusting module to realize the control of the electromagnetic proportional valve, so that the efficiency is higher and the power is lower; and outside interference can be kept apart to whole proportional valve control circuit, increases the stability of proportional valve work to improve the control accuracy to the electromagnetic proportional valve, with the improvement to the accurate adjustment of gas stove firepower, promote the taste of the cooked dish of cooking. The second aspect, the utility model discloses in, the adjustment module is still including zener diode unit and protective resistance unit, and the two sets up between the grid and the source electrode of MOS pipe, can restrict the electric current that flows through zener diode unit through protective resistance unit, so, can the steady voltage through the combination of the two, prevent that the grid of MOS pipe from opening a way work, protection MOS pipe, and then improve the reliability of whole electromagnetic proportional valve control circuit. The third aspect, the utility model discloses an adjustment module is still including feedback resistance unit, and it is connected between the second end of electromagnetism proportional valve and system earthing terminal, forms sampling circuit, and the reverse input of comparator is fed back to the electric current among the sampling circuit, compares with the PWM signal of forward input, and then realizes accurate control to whole proportional valve control circuit 22, improves the precision to the electromagnetic proportional valve control, further improves the accurate control to the gas stove firepower, promotes the taste of the cooked food that cooks out.

Other advantages of the present invention will be described in the detailed description, and those skilled in the art can understand the technical advantages brought by the technical features and technical solutions through the descriptions of the technical features and the technical solutions.

Drawings

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure:

fig. 1 is a schematic diagram of a preferred embodiment of a proportional valve control circuit in a control circuit provided by the present invention;

fig. 2 is a system diagram of a preferred embodiment of the controller provided by the present invention;

fig. 3 is a system diagram of a preferred embodiment of a gas range provided by the present invention;

fig. 4 is a schematic diagram of a preferred embodiment of an ignition control circuit in the controller provided by the present invention.

In the figure, the position of the upper end of the main shaft,

10. a burner; 11. an ignition mechanism; 12. a flame detection mechanism; 13. a first electromagnetic proportional valve; 14. A second electromagnetic proportional valve; 15. a stop valve;

20. a controller; 21. a control center; 22. a proportional valve control circuit; 221. an amplifying module; 222. an adjustment module; 223. a feedback module; 23. a stop valve control circuit; 24. an ignition control circuit; 25. a flame detection control circuit; 26. a touch display driving circuit;

30. touch-control display screen.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the spirit of the present invention, well-known methods, procedures, flows, and components have not been described in detail.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The utility model provides a gas stove, as shown in figure 3, including top of a kitchen range and combustor 10, combustor 10 is installed in the top of a kitchen range. The burner 10 has an opening-controllable electromagnetic proportional valve (including a first electromagnetic proportional valve 13 and a second electromagnetic proportional valve 14).

As shown in fig. 1, the proportional valve control circuit 22 includes an amplifying module 221, an adjusting module 222, and a feedback module 223, where the adjusting module 222 includes a transistor Q1, a field effect transistor Q2, a zener diode unit, and a protection resistor unit; the two ends of the protection resistance unit are connected with the two ends of the voltage stabilizing diode unit, and are also connected with the source electrode and the grid electrode of the field effect transistor Q2, one end connected with the source electrode is also connected with a first power supply VC1, and one end connected with the grid electrode is also connected with the collector electrode of the triode Q1; the drain electrode of the field effect tube Q2 is connected with the first end of the electromagnetic proportional valve; the emitter of the transistor Q1 is connected to system ground, and the base is connected to the output of the amplifying module 221. The amplifying module 221 comprises a comparator U1, wherein a positive power supply of the comparator U17 is connected with the second power supply VC2, a negative power supply is connected with the system ground, a positive input end is connected with a control port of the electromagnetic proportional valve, and a negative input end is connected with a second end of the electromagnetic proportional valve. The feedback module 223 includes a feedback resistance unit, and two ends of the feedback resistance unit are respectively connected with the second end of the electromagnetic proportional valve and the system ground.

When the gas stove is in operation, when the control center 21 extracts a fire power adjustment command, a PWM signal corresponding to the fire power adjustment command is obtained through processing, the PWM signal has a certain duty ratio, the PWM signal is output to the proportional valve control port, the proportional valve control circuit 22 compares the voltage of the feedback module receiving the PWM signal and the input current of the electromagnetic proportional valve through the comparator U1, and controls the output of the comparator U1, specifically, when the opening degree of the electromagnetic proportional valve is too large (i.e., the input current value is too large), the output end of the comparator U1 outputs a signal to control the triode Q1 and the MOS tube Q2 to be closed, so as to reduce the input current flowing through the electromagnetic proportional valve, i.e., reduce the opening degree of the electromagnetic proportional valve. On the contrary, when the opening of the electromagnetic proportional valve is too small, the output end of the comparator U1 outputs a control signal to control the transistor Q1 and the MOS transistor Q2 to open, so as to increase the input current of the electromagnetic proportional valve, i.e., increase the opening of the electromagnetic proportional valve, and finally, maintain the opening of the electromagnetic proportional valve at a small fluctuation from top to bottom corresponding to the fire power value of the fire power command, i.e., to be in a stable state. In the present invention, in the first aspect, the combination of the transistor Q1 and the MOS transistor Q2 is adopted in the adjustment module 222 to control the electromagnetic proportional valve, so that the efficiency is higher and the power is lower; and the whole proportional valve control circuit 22 can isolate external interference, and the working stability of the electromagnetic proportional valve is increased, so that the control precision of the proportional valve is improved. In a second aspect, if the impedance between the gate and the source of the MOS transistor Q2 is too high, the sudden change in the drain-source voltage can be coupled to the gate through the inter-electrode capacitance to generate a relatively high voltage overshoot between the gate and the source, which can cause permanent damage to the gate oxide layer and, if the voltage is transient in the positive direction, can also cause mis-conduction of the device. Therefore, the impedance of the gate driving circuit is properly reduced, and the utility model discloses in, the adjusting module 222 is still including zener diode unit and protection resistance unit, the two sets up between MOS pipe Q2's grid and source electrode, can restrict the electric current that flows through zener diode unit through the protection resistance unit, so, can the steady voltage through the combination of the two, prevent MOS pipe Q2's grid open circuit work, protection MOS pipe Q2, and then improve the reliability of whole electromagnetic proportional valve control circuit 22. Third aspect, the utility model discloses an adjustment module 222 is still including feedback resistance unit, and it is connected between the second end of electromagnetism proportional valve and system ground, forms sampling circuit, and the reverse input of comparator U1 is fed back to the electric current among the sampling circuit, compares with the PWM signal of forward input, and then realizes accurate control to whole electromagnetism proportional valve control circuit 22, improves the precision to the electromagnetism proportional valve control.

Specifically, the zener diode unit may only include one zener diode, in a preferred embodiment of the present invention, the zener diode unit includes a first zener diode D1 and a second zener diode D2, the anode of the first zener diode is connected to the anode of the second zener diode, and the cathodes of the first and second zener diodes are respectively disposed at two ends of the protection resistance unit. Considering that the MOS transistor Q2 is connected with an electromagnetic proportional valve, the electromagnetic proportional valve generates a relatively high instantaneous voltage when being suddenly powered on and suddenly powered off, the two reverse series-connected zener diodes can perform a bidirectional voltage stabilizing function on the MOS transistor Q2, and when an overvoltage occurs between the source and the gate of the MOS transistor Q2, the first zener diode D1 and the second zener diode D2 are firstly broken down to generate a short circuit, so as to better protect the MOS transistor Q2.

The protection resistance unit can only include a resistance in the utility model discloses in, including parallelly connected first resistance R1 and second resistance R2, through the combination of these two resistances, can play the effect of partial pressure, protect the MOS pipe better.

The feedback resistance unit comprises a third resistor R3 and a fourth resistor R4 which are arranged in series, and the feedback current of the electromagnetic proportional valve can be limited through the series connection of the two resistors, so that the reliability of the whole proportional valve control circuit 22 is protected. Of course, the feedback resistance unit may include only one resistance, three or more resistances.

With continued reference to fig. 1, the feedback module 223 further includes a fifth resistor R5 and a sixth resistor R6 connected in series, where two ends of the fifth resistor R5 and the sixth resistor R6 connected in series are respectively connected to the second end of the electromagnetic proportional valve and the second power supply VC2, and at this time, the inverting input end of the comparator U1 is connected between the fifth resistor R5 and the sixth resistor R6, so as to limit the voltage input to the comparator U1, and ensure the reliability of the operation of the comparator U1.

Further, the adjusting module 222 further includes a second current limiting resistor R8 and a third current limiting resistor R9, wherein the second current limiting resistor R8 is connected between the output terminal of the amplifying module 221 and the base of the transistor Q1; the third current limiting resistor R9 is connected between the collector of the transistor Q1 and the gate of the MOS transistor Q2, and the current of the circuit in which the third current limiting resistor R9 is located is limited by adding the current limiting resistor, so that the reliability of the entire electromagnetic proportional valve control circuit 22 is ensured.

The amplifying module 221 further includes a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, a first current limiting resistor R7, and a pull-up resistor R10, wherein the first filter capacitor C1 is connected between the positive input terminal of the comparator Q1 and the system ground; the second filter capacitor C2 is connected between the negative input terminal of the comparator Q1 and the system ground, and the third filter capacitor C3 is connected between the second power supply VC2 and the positive power supply terminal of the comparator Q1; the pull-up resistor R10 is connected between the output end of the comparator Q1 and the second power supply VC 2; first current-limiting resistor R7 is connected between the positive input of proportional valve control port and comparator Q1, the utility model discloses in, can reduce the signal that gets into positive input and the negative-going input of comparator Q1 more level and smooth through first filter capacitor C1 and second filter capacitor C2, make the signal that gets into comparator Q1 more level and smooth, make the feeder ear signal of comparator Q1 more stable level and smooth through third filter capacitor C3; the pull-up resistor R10 can ensure that the level of the output of the comparator Q1 is high, and the output drive current can be increased.

Specifically, the first current limiting resistor R7, the second current limiting resistor R8, and the third current limiting resistor R9 may include one, two, or more, respectively, and the blocking of the current limiting resistors may be equal or unequal.

The proportional valve control circuit 22 further includes a freewheeling diode D3, a negative electrode of the freewheeling diode D3 is connected between the first end of the electromagnetic proportional valve and the drain of the MOS transistor Q2, and a positive electrode is connected to the system ground. When current passes through the electromagnetic proportional valve, induced electromotive force is generated at two ends of the electromagnetic proportional valve, and when the current disappears, the induced electromotive force generates reverse voltage on elements in a circuit. When the reverse voltage is higher than the reverse breakdown voltage of the device, the transistor Q1, the MOS transistor Q2, etc. in the regulation control circuit may be damaged. The utility model discloses a proportional valve control circuit 22 increases has freewheeling diode D3, and freewheeling diode D3 connects in parallel at the both ends of electromagnetism proportional valve, and when the electric current that flows through the electromagnetism proportional valve disappeared, the induced electromotive force that the electromagnetism proportional valve produced worked through the return circuit that freewheeling diode D3 and electromagnetism proportional valve constitute and consumed to triode Q1, MOS pipe Q2's among the adjustment module safety has been protected.

The gas stove further comprises a controller 20, the controller 20 comprises a control center 21 and a proportional valve control circuit 22 according to any one of the embodiments, the control center 21 is provided with a proportional valve control port, and a positive input end of a comparator in the proportional valve control circuit is connected with the proportional valve control port so as to control the opening degree of an electromagnetic proportional valve connected with the proportional valve.

The burner 10 further includes an ignition mechanism 11, a flame detection mechanism 12, an inner ring flame path, an outer ring flame path, and a stop valve 15, and in order to adjust the inner ring flame path and the outer ring flame path respectively and control the fire more accurately, an electromagnetic proportional valve (denoted as a first electromagnetic proportional valve 13) communicating with the inner ring flame path and an electromagnetic proportional valve (denoted as a second electromagnetic proportional valve 14) communicating with the outer ring flame path are provided, the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 communicate with a gas supply end through the stop valve 15, specifically, the burner 10 may be provided with only one, or may be provided with a plurality of, such as two, three, or more, the gas supply end is connected with the stop valve 15 of each burner 10 through a gas inlet manifold, and two outlets of the stop valve 15 are connected with the first proportional valve 13 and the second proportional valve 14, so that the gas needs to enter the inner ring flame path, the second flame path, and the first proportional valve 13 and the second proportional valve 14 through the stop valve 15, An outer ring flame path.

The gas stove further comprises a touch display screen 30, and the controller 20 further comprises a control center 21, a stop valve control circuit 23, an ignition control circuit 24, a flame detection control circuit 25 and a touch display driving circuit 26; the control center 21 is provided with a proportional valve control port, a stop valve control port, an ignition control port, a flame detection port and a touch display port; the stop valve control circuit 23 is connected with the stop valve control port to control the on-off of the stop valve 15; the flame detection control circuit 25 is connected with the flame detection port to transmit the flame detection result to the control center 21; the touch display driving circuit 26 is connected to the touch display port, and is configured to control the touch display screen 30 to work, and transmit a touch instruction of the touch display screen 30 to the control center 21.

It should be noted that each electromagnetic proportional valve is connected to the proportional valve control port through a corresponding proportional valve control circuit, that is, a first proportional valve control circuit and a second proportional valve control circuit are connected to the corresponding first electromagnetic proportional valve 13 and the corresponding second electromagnetic proportional valve 14, respectively, the control center has a corresponding first proportional valve control end and a corresponding second proportional valve control port, the first electromagnetic proportional valve 13 is connected to the first proportional valve control port through the first proportional valve control circuit, and the second electromagnetic proportional valve 14 is connected to the second proportional valve control port through the second proportional valve control circuit. The stop valve 15 is connected with the stop valve control port through the stop valve control circuit 23, the ignition mechanism 11 is connected with the ignition control port through the ignition control circuit 24, the flame detection mechanism 12 is connected with the flame detection port through the flame detection control circuit 25, and the touch display screen 30 is connected with the touch display port through the touch display drive circuit 26. When a plurality of burners 10 are provided, a set of a first electromagnetic proportional valve 13, a second electromagnetic proportional valve 14, a first proportional valve control circuit, a second proportional valve control circuit, a first proportional valve control port and a second proportional valve control port, a stop valve 15, a stop valve control circuit 23, an ignition mechanism 11, an ignition control circuit 24, a flame detection mechanism 12, and a flame detection control circuit is provided for each burner 10. Even when a plurality of burners 10 are provided, only one set of the touch display panel 30 and the touch display driving circuit 26 may be provided, and different burners 10 can be controlled by the same touch display panel 30.

Specifically, the touch display screen 30 is configured to obtain a touch instruction and send the touch instruction to the control center 21, that is, the touch display screen 30 is an interface between a user and the gas stove, and the user can control the gas stove in a touch manner. When the touch display screen 30 is touched, a touch instruction is generated, and after receiving the touch instruction through the touch display driving circuit 26, the control center 21 executes corresponding control according to the touch instruction:

if the touch instruction comprises an ignition instruction, the control center 21 controls the stop valve 15 to open according to the ignition instruction and controls the ignition mechanism 11 to ignite, that is, the control center 21 outputs a stop valve opening signal to the stop valve control port according to the ignition instruction, the stop valve control circuit 23 receives the stop valve opening signal and then controls the stop valve 15 to open, and at the same time, outputs a control signal (which may be a certain preset PWM signal corresponding to the opening degree of the proportional solenoid valve) to the proportional valve control port, and the proportional valve control circuit 22 controls the proportional solenoid valve to open; the control center 21 outputs an ignition signal to the ignition control port, and the ignition control circuit 24 receives the ignition signal and controls the ignition mechanism 11 to ignite;

if the touch control instruction comprises a fire power adjusting instruction, the control center 21 determines respective input current values of the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 according to the fire power adjusting instruction, and outputs PWM signals to proportional valve control ports corresponding to the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 based on the respective input current values, that is, the control center 21 determines an input current value (marked as a first current value) of the first electromagnetic proportional valve 13 and an input current value (marked as a second current value) of the second electromagnetic proportional valve 14 according to the fire power adjusting instruction, and then outputs a first PWM signal to the first proportional valve control port based on the first current value, and the first electromagnetic proportional valve control circuit operates and controls the opening degree of the first electromagnetic proportional valve 13 after receiving the first PWM signal; and outputting a second PWM signal to a second proportional valve control port based on the second current value, and controlling the opening degree of the second electromagnetic proportional valve 14 after the second electromagnetic proportional valve control circuit receives the second PWM signal.

The ignition instruction and the fire power adjustment instruction may be directly input by the user through the touch display screen 30, and the touch instruction directly includes the ignition instruction and the fire power adjustment instruction, that is, the instructions are the touch instructions formed by the direct touch display screen 30 through the user touch operation. The instructions may also be instructions indirectly included in the touch instructions, specifically, in some cases, the gas stove may operate by itself through the navigation recipe, in this case, the user may select the navigation recipe only through the touch display screen 30, and then the gas stove may automatically operate according to the navigation recipe to cook, in this embodiment, the touch instructions are actually the selection of the navigation recipe, and the navigation recipe may include a plurality of cooking stages, each cooking stage may have an ignition instruction, a fire power adjustment instruction, and the like, after receiving the touch instructions, the control center 21 may sequentially execute each cooking stage of the navigation recipe, and when the cooking stage where the ignition instruction is located is operated, the control center 21 generates a stop valve opening signal according to the ignition instruction of the cooking stage; when the cooking stage in which the fire power adjustment instruction is executed, the control center 21 generates the first current value and the second current value according to the fire power adjustment instruction of the cooking stage.

It is understood that after the ignition is completed, the control center 21 will also generate and output a stop ignition signal to the ignition control port to control the ignition mechanism 11 to stop working through the ignition control circuit 24. Whether the ignition is successful or not can be detected through the flame detection mechanism 12, when the flame detection mechanism 12 detects that flame exists, a flame signal is sent to the flame detection port, and the control center 21 generates an ignition signal or stops the ignition signal according to the flame signal.

The gas stove is provided with a touch display screen 30, the controller 20 further comprises a touch display driving circuit 26, the control center 21 is connected with the touch display screen 30, the ignition mechanism 11, the flame detection mechanism 12, the electromagnetic proportional valves (including the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14) and the stop valve 15 through respective control circuits, and therefore when ignition or fire adjustment is needed, the gas stove can be controlled through touch operation of the touch display screen 30, so that fire information prompted by a menu and the like can be accurately adjusted, and even when a navigation menu is automatically operated after the navigation menu is selected through touch operation, accurate adjustment can be performed according to the temperature in the navigation menu or the opening of the fire proportional valve.

In fact, the control center 21 also generates a stop valve closing signal when receiving the fire shut-off command, and sends it to the stop valve control port to control the stop valve 15 to close through the stop valve control circuit 23. The fire-off instruction may be generated by directly touching the touch display screen 30, or may be an instruction included in a navigation menu generated by touching the touch display screen 30.

Specifically, the connection manner of the first electromagnetic proportional valve 13 and the first proportional valve control circuit is the same as the connection manner of the second electromagnetic proportional valve 14 and the second proportional valve control circuit, and therefore, the first electromagnetic proportional valve and the proportional valve control circuit 22 corresponding to the first electromagnetic proportional valve are taken as an example for description, for convenience of description, the first electromagnetic proportional valve is simply referred to as an electromagnetic proportional valve, and the first proportional valve control circuit is simply referred to as a proportional valve control circuit, and the specific connection manner is described in the foregoing with reference to fig. 1, and will not be described again here.

For the comparators U1 in the two proportional valve control circuits 22 of the same burner 10, independent comparator elements may be selected respectively, or the same comparator element may be selected, when the same comparator element is selected, two sets of positive input terminal, negative input terminal, positive power supply terminal, and negative power supply terminal are provided, and when the third filter capacitor C3 is connected between the positive power supply terminal and the second power supply source VC2, only one of the positive power supply terminals may be connected to the third filter capacitor C3.

The control center 21 can be a single chip microcomputer, and the specific model can be selected according to the requirement.

As shown in fig. 4, in the ignition control circuit 25, MOS transistors Q17 and Q20 are connected to a primary coil of an ignition transformer T3, a secondary coil of the ignition transformer T3 is connected to diodes D22 and D29, and diodes D22 and D29 are connected to a high-voltage pack T4 of the ignition mechanism 11 through a discharge capacitor C27, and when the MOS transistor Q17 receives a control signal output from an ignition control port, the MOS transistors Q17 and Q20 are turned on, the ignition transformer T3 causes a secondary coil to periodically charge and discharge a discharge capacitor C27 through diodes D22 and D29, and when the discharge capacitor C27 discharges the high-voltage pack T4, a secondary coil of the high-voltage pack T4 generates a high voltage and discharges through air to achieve ignition.

The flame detection control circuit 25 comprises a flame analog signal detection circuit and a flame analog digital signal conversion circuit which are connected with each other, wherein the flame analog signal detection circuit is connected with the flame detection control port and converts the fire ion signal of the flame detection mechanism 12 into an electric analog signal; the flame analog-to-digital signal conversion circuit converts the electrical analog signal to a signal required by the control center 21.

The stop valve control circuit 23 comprises a MOS transistor Q19, and the signal output from the stop valve control port controls the MOS transistor Q19 to open or close, thereby controlling the on-off of the stop valve 15 connected with the MOS transistor Q19.

It should be noted that specific values of the capacitors and the resistors can be set according to circuit requirements, and the present invention is not limited thereto. The specific values of the first power supply VC1 and the second power supply VC2 can also be set as required, for example, in an embodiment, the value of the first power supply VC1 is selected to be 30V, and the value of the second power supply VC2 is selected to be 5V. Further, the controller 20 further includes a wireless module, the control center 21 is further provided with a wireless signal acquisition port connected to the wireless signal acquisition port, and the control center 21 can acquire temperature information of cooked food through a wireless communication signal and control the touch display screen 30 to display the temperature information.

Just in the foregoing, the utility model discloses a gas-cooker not only can realize manual culinary art, in each stage of culinary art promptly, through manual touch-control display screen 30 with each parameter to in the culinary art regulation and control, also can realize automatic culinary art through the navigation menu. When the automatic cooking is realized through the navigation recipe, the navigation recipe may be the navigation recipe directly stored in the controller 20, for example, the controller 20 further includes a storage module, and the navigation recipe is stored in the storage module. Sometimes, the user wants to select a richer menu, and the user can operate the menu through a mobile phone, a cloud and the like, and at the moment, the gas stove can be in wireless communication with the mobile phone and the cloud through the wireless module. In the cooking process, especially in the automatic cooking process, temperature information in the pot is often required to be acquired, for some intelligent pots, a temperature sensor and a wireless transmitting module which are connected with each other are arranged on the intelligent pot, and at the moment, the gas stove can acquire the temperature information of the temperature sensor on the intelligent pot through the wireless module. Specifically, the control center 21 performs corresponding control according to the acquired wireless signal:

if the wireless signal includes temperature data, the control center 21 controls the touch display screen 30 to display the temperature data;

if the wireless signal comprises menu data, the control center controls the display screen to display the menu data, and the menu data can be the navigation menu.

Specifically, in the automatic cooking process, the cooking stage in the navigation recipe may also include some ideal temperatures, or in the manual cooking, the user may also input some ideal temperatures, specifically, if the touch instruction includes an ideal temperature value (including an ideal temperature value input by the direct manual touch operation and an ideal temperature value of the cooking stage obtained through the navigation recipe), the control center 21 further determines an input current value of the electromagnetic proportional valve according to the ideal temperature value and the temperature information obtained through the wireless module, and outputs a PWM signal to the proportional valve control circuit based on the input current value to control the electromagnetic proportional valve to operate. That is, the control center 21 may also determine the input current value of the electromagnetic proportional valve according to the ideal temperature value and the actual temperature information, and of course, determine the input current values of the first electromagnetic proportional valve and the second electromagnetic proportional valve, respectively. Therefore, the accurate control of the whole gas stove on food in the cooking process is improved, and the taste of cooked dishes is improved.

When the gas-cooker includes a plurality of combustors 10, the user can also confirm its combustor 10 of selecting the culinary art according to the touch-control operation to touch-control display screen 30, specifically, if touch-control instruction includes combustor selection instruction, control center 21 sends the control command that ignition instruction, firepower regulation instruction formed for ignition mechanism 11, the proportional valve control circuit 22 of corresponding combustor 10 according to combustor selection instruction, promptly the utility model discloses can adopt same touch-control display screen 30 to control a plurality of combustors 10, correspond a touch-control display screen 30 respectively for each combustor 10, the space of gas-cooker can obviously be saved to this kind of mode to and convenience of customers' operation.

Of course, the control center 30 can touch the display driving circuit 26 through the touch display port input value for the specific fire value, temperature information and the acquired navigation menu in the fire adjustment command, so as to control the touch display screen 30 to display these information.

The utility model discloses a concrete working process of gas-cooker as follows: when a user inputs a start-up instruction through the touch display screen 30, and the control center 21 receives the touch instruction, the flame detection control circuit 25 is controlled to detect whether a flame signal is present or not, and if so, the flame signal is abnormal, and if not, the flame signal is normal. When the ignition control circuit 24 works normally, the high-voltage packet T4 on the ignition control circuit discharges to generate electric arc to air, then the control center 21 controls the control circuits of all valve bodies (including the stop valve 15 and the electromagnetic proportional valve) to work, the stop valve control circuit 23 opens the stop valve 15 to open the total air path, the proportional valve control circuit 22 correspondingly opens the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 in sequence, at the moment, the flame detection control circuit 25 detects a flame signal, if flame exists, the control center 21 controls the ignition control circuit 24 to close ignition according to the flame information, and then the working mode is entered; if no flame signal is detected after a certain time, the control center 21 controls the ignition control circuit 24 to close the ignition and stop valve control circuit 23 to close the stop valve 15, the proportional valve control circuit 22 to close the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14, then the steps are repeated, if flame is still not detected, the control center 21 outputs an abnormal state, and the information can be displayed through the touch display screen.

Additionally, the utility model also provides a control circuit for having touch-control display screen's gas-cooker, this circuit can encapsulate for above-mentioned controller, specifically includes each part of above-mentioned controller 20, consequently, just does not give unnecessary details here.

It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

It will be understood that the above-described embodiments are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions may be made in the details described herein by those skilled in the art without departing from the basic principles of the invention.

Claims

1. A proportional valve control circuit for a gas range having an electromagnetic proportional valve with a controllable opening degree, comprising:

the feedback module comprises a feedback resistance unit, and two ends of the feedback resistance unit are respectively connected with the second end of the electromagnetic proportional valve and the system ground;

2. The proportional valve control circuit of claim 1, wherein the zener diode unit comprises a first zener diode and a second zener diode, an anode of the first zener diode is connected to an anode of the second zener diode, and cathodes of the first zener diode and the second zener diode are respectively connected to two ends of the protection resistor unit.

3. The proportional valve control circuit of claim 1, wherein the protective resistance unit comprises a first resistance and a second resistance connected in parallel.

4. The proportional valve control circuit of claim 1, wherein the feedback resistance unit comprises a third resistor and a fourth resistor arranged in series.

5. The proportional valve control circuit of claim 1, wherein the feedback module further comprises a fifth resistor and a sixth resistor connected in series, the fifth resistor and the sixth resistor are connected in series and connected to the second end of the electromagnetic proportional valve and the second power supply, respectively, and the inverting input terminal of the comparator is connected between the fifth resistor and the sixth resistor.

6. The proportional valve control circuit of any of claims 1-5, wherein the amplification module further comprises a first filter capacitor, a second filter capacitor, a third filter capacitor, a first current limiting resistor, and a pull-up resistor, the first filter capacitor being connected between the positive input of the comparator and system ground; the second filter capacitor is connected between the negative input end of the comparator and the system ground, and the third filter capacitor is connected between the second power supply and the positive power supply end of the comparator; the pull-up resistor is connected between the output end of the comparator and a second power supply; the first current limiting resistor is connected between the control end of the electromagnetic proportional valve and the positive input end of the comparator.

7. The proportional valve control circuit of any of claims 1-5, wherein the regulation module further comprises a second current limiting resistor and a third current limiting resistor, the second current limiting resistor coupled between the output of the amplification module and the base of the transistor; the third current limiting resistor is connected between the collector of the triode and the grid of the MOS tube.

8. A controller for a gas stove with an electromagnetic proportional valve with controllable opening degree, characterized in that the controller comprises a control center and a proportional valve control circuit according to any one of claims 1-5, the control center is provided with an electromagnetic proportional valve control port, and a positive input end of the comparator in the electromagnetic proportional valve control circuit is connected with the electromagnetic proportional valve control port for controlling the opening degree of the electromagnetic proportional valve.

9. The controller of claim 8,

the control center also comprises a stop valve control port, a flame detection port, a touch display port and a wireless signal acquisition port;

the controller further includes:

10. A gas range comprising a cooktop and a burner mounted to the cooktop, the burner having an electromagnetic proportional valve with a controllable opening degree, characterized in that the gas range further comprises a controller according to claim 8 or 9.