Cooker fan control circuit

Abstract

The utility model relates to a stove fan control circuit, belongs to household electrical appliance technical field, including master control circuit, detection circuit and drive circuit, the detection circuit includes connecting module (P2), potentiometer and divider resistance, the utility model discloses a setting up the potentiometer to identify the firepower, then adjust the fan speed according to the firepower, and the drive circuit is connected with the drive circuit. And the fuel gas can obtain a proper amount of air for premixing before combustion, so that the combustion efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of household appliance technology, specifically relating to a stove fan control circuit. Background Technology

[0002] Most household gas stoves are atmospheric type, with two plug valves on the left and right burners equipped with thermocouple solenoid valves or self-priming valves, which can easily lead to low combustion efficiency and incomplete combustion of gas. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a stove fan control circuit.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A stove fan control circuit includes a main control circuit, a detection circuit, and a drive circuit;

[0006] The detection circuit is used to detect the firepower of the stove and send a detection signal to the main control circuit.

[0007] The main control circuit is connected to the detection circuit and the driving circuit respectively. The main control circuit sends a driving signal to the driving circuit according to the detection signal of the detection circuit.

[0008] The drive circuit is used to drive the fan according to the drive signal from the main control circuit.

[0009] According to some embodiments of the present invention, the detection circuit includes a connection module, a potentiometer, and a voltage divider resistor;

[0010] The connection module includes a detection pin and a transmission pin. The detection pin is connected to the potentiometer, and the transmission pin is connected to the voltage divider resistor and the main control circuit respectively. The detection pin and the transmission pin are connected in series.

[0011] One end of the voltage divider resistor is connected to the transmission pin, and the other end of the voltage divider resistor is connected to the first power supply;

[0012] The potentiometer is installed on the rotary valve body of the stove, and the potentiometer is used to detect the degree of opening and closing.

[0013] According to some embodiments of this utility model, the number of potentiometers is not less than one, and the number of detection pins, transmission pins, and voltage divider resistors is equal to the number of potentiometers.

[0014] According to some embodiments of the present invention, a first filter circuit is also connected between the transmission pin and the main control circuit.

[0015] According to some embodiments of the present invention, the first filter circuit is an RC filter circuit, which includes a first filter resistor and a first filter capacitor. One end of the first filter resistor is connected to the transmission pin, and the other end of the first filter resistor is connected to the main control circuit. One end of the first filter capacitor is connected to one end of the first filter resistor, and the other end of the first filter capacitor is grounded.

[0016] According to some embodiments of the present invention, the main control circuit includes a main control chip and a second filter circuit. The positive power input terminal of the main control chip is connected to a first power supply, the negative power input terminal of the main control chip is grounded, and the positive power input terminal and the negative power input terminal of the main control chip are connected to the second filter circuit.

[0017] According to some embodiments of the present invention, the drive circuit includes a power supply control circuit, a power supply circuit, and a fan;

[0018] The power supply control circuit includes a first switch assembly, a second switch assembly, and a second resistor. The first port of the first switch assembly is connected to the main control circuit and is used to receive control signals from the main control circuit. The second port of the first switch assembly is grounded. The third port of the first switch assembly is connected to the first port of the second switch assembly.

[0019] The first port of the second switch assembly is also connected to the second power supply through the second resistor, the second port of the second switch assembly is connected to the second power supply, and the third port of the second switch assembly is connected to the power supply circuit.

[0020] The power supply circuit is connected to the control circuit and the fan respectively;

[0021] When the first port of the first switch component receives a high-level signal, the second port and the third port of the first switch component are connected, the first port of the second switch component is grounded through the second port of the first switch component, the second port and the third port of the second switch component are connected, and the second power supply supplies power to the power supply circuit; when the first port of the first switch component receives a low-level signal, the second port and the third port of the first switch component are cut off, the first port of the second switch component is connected to the second power supply through the second resistor (R2), the second port and the third port of the second switch component are cut off, and the second power supply stops supplying power to the power supply circuit.

[0022] According to some embodiments of the present invention, the power supply circuit includes an inductor, a polarized capacitor, and a freewheeling diode;

[0023] The second port of the second switching assembly is connected to the second power supply; the third port of the second switching assembly is connected to one end of the inductor and the negative terminal of the freewheeling diode, respectively.

[0024] The first port of the fan is connected to the negative terminal of the polarized capacitor and the positive terminal of the freewheeling diode, the second port of the fan is connected to the positive terminal of the polarized capacitor and the other end of the inductor, and the first port of the fan is grounded.

[0025] According to some embodiments of this utility model, the third port of the fan is connected to the main control circuit for sending a speed signal to the main control circuit.

[0026] According to some embodiments of the present invention, the third port of the fan is also connected to the first power supply, and a third filter circuit is also connected between the third port of the fan and the main control circuit.

[0027] The beneficial effects of this utility model are as follows: by setting a potentiometer to identify the fire intensity, and then adjusting the fan speed according to the fire intensity, the gas can be premixed with an appropriate amount of air before combustion, thereby improving combustion efficiency. Attached Figure Description

[0028] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1 This is a circuit diagram of the detection circuit provided in one embodiment of the present invention;

[0030] Figure 2 This is a circuit diagram of the main control circuit provided in one embodiment of the present invention;

[0031] Figure 3 This is a circuit diagram of the driving circuit provided in one embodiment of the present invention;

[0032] Figure 4 This is a circuit diagram of the driving circuit provided in another embodiment of the present invention.

[0033] In the diagram: P1, right fan; P2, connecting module; P3, left fan; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; C6-C7, first filter capacitor; C8, eighth capacitor; C9, ninth capacitor; L1, first inductor; L2, second inductor; D1, first diode; D2, second diode; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor. Resistors; R7-R8, voltage divider resistors; R9-R10, first filter resistors; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; R14, fourteenth resistor; R15, fifteenth resistor; R16, sixteenth resistor; R17, first potentiometer; R18, second potentiometer; Q1, first MOSFET; Q3, second MOSFET; Q2, first transistor; Q4, second transistor; U1, main control chip; a1-a2, detection pins; b1-b2, transmission pins. Detailed Implementation

[0034] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0035] The stove fan control circuit provided in this embodiment includes a main control circuit, a detection circuit, and a drive circuit;

[0036] The detection circuit is used to detect the firepower of the stove and send a detection signal to the main control circuit.

[0037] The main control circuit is connected to both the detection circuit and the drive circuit. The main control circuit sends a drive signal to the drive circuit based on the detection signal from the detection circuit.

[0038] The drive circuit is used to drive the fan according to the drive signal from the main control circuit.

[0039] Please refer to Figure 1 In a further embodiment of this utility model, the detection circuit includes a connection module P2, a potentiometer, and a voltage divider resistor;

[0040] The connection module P2 includes a detection pin and a transmission pin. The detection pin is connected to a potentiometer, and the transmission pin is connected to the main control circuit via a voltage divider resistor. The detection pin and the transmission pin are connected in series.

[0041] One end of the voltage divider resistor is connected to the transmission pin, and the other end of the voltage divider resistor is connected to the first power supply;

[0042] The potentiometer is installed on the stopcock valve body of the stove and is used to detect the degree of opening and closing.

[0043] In this embodiment, detection pin a1 is connected to a first potentiometer R17, which is mounted on the rotary valve body of the stove and used to detect the degree of stove opening / closing. Transmission pin b1 is connected to one end of a voltage divider resistor R7 and the active circuit, respectively. The other end of the voltage divider circuit R7 is connected to a 5V power supply. Detection pin a1 and transmission pin b1 are connected in series, forming a voltage divider sampling circuit with the first potentiometer R17 and the voltage divider resistor R7. The main control circuit can accurately determine the firepower level through AD sampling. When the stove's firepower increases, the main control circuit increases the fan speed; when the stove's firepower decreases, the main control circuit decreases the fan speed.

[0044] Please refer to Figure 1 In a further embodiment of this utility model, the number of potentiometers is not less than one, and the number of detection pins, transmission pins and voltage divider resistors is equal to the number of potentiometers.

[0045] The detection circuit is equipped with multiple potentiometers for detecting different burners on the same stove. The specific number of potentiometers can be adjusted according to the number of burners on different stoves.

[0046] In this embodiment, the detection circuit is equipped with two potentiometers, suitable for detecting the firepower of a stove with two burners. Specifically, the first potentiometer R17, detection pin a1, transmission pin b1, and voltage divider resistor R7 are used to detect the firepower of the first burner; the second potentiometer R18, detection pin a2, transmission pin b2, and voltage divider resistor R8 are used to detect the firepower of the second burner.

[0047] In a further embodiment of this utility model, a first filter circuit is also connected between the transmission pin and the main control circuit.

[0048] Please refer to Figure 1 In a further embodiment of this utility model, the first filter circuit is an RC filter circuit. The first filter circuit includes a first filter resistor and a first filter capacitor. One end of the first filter resistor is connected to the transmission pin, and the other end of the first filter resistor is connected to the main control circuit. One end of the first filter capacitor is connected to one end of the first filter resistor, and the other end of the first filter capacitor is grounded.

[0049] In this embodiment, the first filter circuit formed by the first filter resistor R9 and the first filter capacitor C6 is connected between the main control circuit and the first potentiometer R17; the first filter circuit formed by the first filter resistor R10 and the first filter capacitor C7 is connected between the main control circuit and the second potentiometer R18.

[0050] Please refer to Figure 2In a further embodiment of this utility model, the main control circuit includes a main control chip U1 and a second filter circuit. The positive power input terminal of the main control chip U1 is connected to the first power supply, the negative power input terminal of the main control chip U1 is grounded, and the positive power input terminal and the negative power input terminal of the main control chip U1 are connected to the second filter circuit.

[0051] In this embodiment, the second filter circuit includes a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5; one end of the third capacitor C3, one end of the fourth capacitor C4, and one end of the fifth capacitor C5 are respectively connected to the first power supply 5V voltage source and the positive power input terminal (VDD) of the main control chip U1; the other end of the third capacitor C3, the other end of the fourth capacitor C4, and the other end of the fifth capacitor C5 are respectively connected to the power ground and the negative power input terminal (VSS) of the main control chip U1.

[0052] Please refer to Figure 3 In a further embodiment of this utility model, the drive circuit includes a power supply control circuit, a power supply circuit, and a fan;

[0053] The power supply control circuit includes a first switching assembly, a second switching assembly, and a second resistor R2. The first port of the first switching assembly is connected to the main control circuit and is used to receive the control signal from the main control circuit; the second port of the first switching assembly is grounded; and the third port of the first switching assembly is connected to the first port of the second switching assembly.

[0054] The first port of the second switch assembly is also connected to the second power supply through the second resistor R2, the second port of the second switch assembly is connected to the second power supply, and the third port of the second switch assembly is connected to the power supply circuit.

[0055] The power supply circuit is connected to the control circuit and the fan respectively;

[0056] When the first port of the first switch component receives a high-level signal, the second and third ports of the first switch component are connected, the first port of the second switch component is grounded through the second port of the first switch component, the second port of the second switch component is connected to the third port, and the second power supply supplies power to the power supply circuit; when the first port of the first switch component receives a low-level signal, the second and third ports of the first switch component are cut off, the first port of the second switch component is connected to the second power supply through the second resistor R2, the second port of the second switch component is cut off, and the second power supply stops supplying power to the power supply circuit.

[0057] In this embodiment, an NPN transistor Q2 is used as the first switching component. The base of the first transistor Q2 is the first port of the first switching component, the emitter of the first transistor Q2 is the second port of the first switching component, and the collector of the first transistor Q2 is the third port of the first switching component. The second switching component is a PMOS transistor Q1. The gate of the first transistor Q1 is the first port of the second switching component, the source of the first transistor Q1 is the second port of the second switching component, and the drain of the first transistor Q1 is the third port of the second switching component. The base of the first transistor Q2 is connected to the main control circuit through a fifth resistor R5 to receive control signals from the main control circuit. The collector of the first transistor Q2 is connected to the power supply circuit through a fourth resistor R4. The emitter of the first transistor Q2 is grounded. The base of the first transistor Q2 is also connected to a pull-down resistor R6. The fourth resistor R4 and the fifth resistor R5 are current-limiting resistors.

[0058] When the base of the first transistor Q2 receives a high-level signal from the main control circuit, the first transistor Q2 turns on, and the power supply circuit is grounded through the first transistor Q2.

[0059] In a further embodiment of this utility model, the power supply circuit includes an inductor, a polarized capacitor, and a freewheeling diode;

[0060] The third port of the second switching assembly is connected to one end of the inductor and the negative terminal of the freewheeling diode, respectively.

[0061] The first port of the fan is connected to the negative terminal of the polarized capacitor and the positive terminal of the freewheeling diode, respectively. The second port of the fan is connected to the positive terminal of the polarized capacitor and the other end of the inductor, respectively. The first port of the fan is grounded.

[0062] In this embodiment, the gate of the first MOSFET Q1 is connected to the collector of the first transistor Q2, and is also connected to the second pull-up resistor R2; the source of the first MOSFET Q1 is connected to the second 12V power supply, and the drain of the first MOSFET Q1 is connected to the right fan P1 through the first inductor L1. When the first transistor Q2 receives a high-level signal from the main control circuit, the first transistor Q2 is turned on, the gate of the first MOSFET Q1 is grounded through the first transistor Q2, and the source and drain of the first MOSFET Q1 are connected. The second 12V power supply provides power to the fan.

[0063] The main control circuit controls the motor via a PWM signal. It includes a first inductor L1 and a polarized capacitor C2 to store energy. This allows it to supply power to the motor when the PWM signal is low (i.e., when the second power supply stops supplying power), maintaining motor operation and making it more stable. A freewheeling diode, the first diode D1, is included to prevent a reverse electromotive force from forming across the first inductor L1 and damaging the first MOSFET Q1 when it is turned off.

[0064] When a stove has multiple burners, the control circuit will also have multiple drive circuits, and the number of drive circuits will be the same as the number of burners.

[0065] In a further embodiment of this utility model, the third port of the fan is connected to the main control circuit for sending a speed signal to the main control circuit.

[0066] In this embodiment, the main control circuit detects the actual speed of the fan based on the speed signal sent by the fan through the third port, and adjusts the frequency of the PWM signal sent by the main control circuit to the drive circuit according to the actual speed of the fan, thereby changing the input voltage of the motor.

[0067] Meanwhile, the main control circuit determines whether the fan is in normal operating condition through the speed signal. It can also be equipped with alarm devices such as buzzers or display alarms. When the main control circuit detects that the fan is in an abnormal operating condition, it will issue an alarm in a timely manner.

[0068] Please refer to Figure 3-4 In a further embodiment of this utility model, the third port of the fan is also connected to the first power supply, and a third filter circuit is also connected between the third port of the fan and the main control circuit.

[0069] The third filter circuit is an RC filter circuit composed of the third resistor and the first capacitor; at the same time, the port of the main control circuit connected to the third port of the fan is also connected to the pull-up resistor R3 to prevent the IO from being floating and in an unstable state.

[0070] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A stove fan control circuit, characterized in that, Includes main control circuit, detection circuit and drive circuit; The detection circuit is used to detect the firepower of the stove and send a detection signal to the main control circuit. The main control circuit is connected to the detection circuit and the driving circuit respectively. The main control circuit sends a driving signal to the driving circuit according to the detection signal of the detection circuit. The drive circuit is used to drive the fan according to the drive signal of the main control circuit; The detection circuit includes a connection module (P2), a potentiometer, and a voltage divider resistor; The connection module (P2) includes a detection pin and a transmission pin. The detection pin is connected to the potentiometer, and the transmission pin is connected to the voltage divider resistor and the main control circuit respectively. The detection pin and the transmission pin are connected in series. One end of the voltage divider resistor is connected to the transmission pin, and the other end of the voltage divider resistor is connected to the first power supply; The potentiometer is installed on the rotary valve body of the stove, and the potentiometer is used to detect the degree of opening and closing.

2. The stove fan control circuit according to claim 1, characterized in that, The number of potentiometers shall be no less than one, and the number of detection pins, transmission pins, and voltage divider resistors shall be equal to the number of potentiometers.

3. The stove fan control circuit according to claim 1, characterized in that, A first filter circuit is also connected between the transmission pin and the main control circuit.

4. A stove fan control circuit according to claim 3, characterized in that, The first filter circuit is an RC filter circuit, which includes a first filter resistor and a first filter capacitor. One end of the first filter resistor is connected to the transmission pin, and the other end of the first filter resistor is connected to the main control circuit. One end of the first filter capacitor is connected to one end of the first filter resistor, and the other end of the first filter capacitor is grounded.

5. A stove fan control circuit according to claim 1, characterized in that, The main control circuit includes a main control chip U1 and a second filter circuit. The positive power input terminal of the main control chip U1 is connected to a first power source, and the negative power input terminal of the main control chip U1 is grounded. The positive power input terminal and the negative power input terminal of the main control chip U1 are connected to the second filter circuit.

6. A stove fan control circuit according to claim 1, characterized in that, The drive circuit includes a power supply control circuit, a power supply circuit, and a fan; The power supply control circuit includes a first switch assembly, a second switch assembly, and a second resistor (R2). The first port of the first switch assembly is connected to the main control circuit and is used to receive control signals from the main control circuit. The second port of the first switch assembly is grounded. The third port of the first switch assembly is connected to the first port of the second switch assembly. The first port of the second switch assembly is also connected to the second power supply through the second resistor (R2), the second port of the second switch assembly is connected to the second power supply, and the third port of the second switch assembly is connected to the power supply circuit. The power supply circuit is connected to the power supply control circuit and the fan respectively; When the first port of the first switch component receives a high-level signal, the second port and the third port of the first switch component are connected, the first port of the second switch component is grounded through the second port of the first switch component, the second port and the third port of the second switch component are connected, and the second power supply supplies power to the power supply circuit; when the first port of the first switch component receives a low-level signal, the second port and the third port of the first switch component are cut off, the first port of the second switch component is connected to the second power supply through the second resistor (R2), the second port and the third port of the second switch component are cut off, and the second power supply stops supplying power to the power supply circuit.

7. A stove fan control circuit according to claim 6, characterized in that, The power supply circuit includes an inductor, a polarized capacitor, and a freewheeling diode; The third port of the second switching assembly is connected to one end of the inductor and the negative terminal of the freewheeling diode, respectively. The first port of the fan is connected to the negative terminal of the polarized capacitor and the positive terminal of the freewheeling diode, the second port of the fan is connected to the positive terminal of the polarized capacitor and the other end of the inductor, and the first port of the fan is grounded.

8. A stove fan control circuit according to claim 6, characterized in that, The third port of the fan is connected to the main control circuit and is used to send a speed signal to the main control circuit.

9. A stove fan control circuit according to claim 8, characterized in that, The third port of the fan is also connected to the first power supply, and a third filter circuit is also connected between the third port of the fan and the main control circuit.

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