Burner fan control circuit structure

Abstract

The utility model relates to a furnace end fan control circuit structure, which comprises a main control circuit, a power sampling circuit and a wind speed control circuit, wherein the power sampling circuit is used for collecting furnace end power; the wind speed control circuit is used for receiving a PWM (Pulse-Width Modulation) signal and controlling a furnace end fan; the main control circuit is respectively connected with the power sampling circuit and the wind speed control circuit so as to output a corresponding PWM (Pulse-Width Modulation) signal to the wind speed control circuit after receiving a signal from the power sampling circuit and further control the rotating speed of the furnace end fan; the rotating speed of the furnace end fan is controlled through PWM to control the power of the furnace end, on one hand, noise generated during ignition and flaming of the electric flame stove can be reduced, on the other hand, the furnace end obtains stable air pressure and air inlet amount, ozone is reduced, flames of the electric flame stove can be more stable, and conversion of heat efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of electric flame stove technology, and in particular to a burner fan control circuit structure, which is mainly used in electric flame stoves. Background Technology

[0002] As people's living standards continue to improve, various new and intelligent living devices are emerging. These intelligent living devices not only bring great convenience to people's lives and improve their quality of life, but also enable people to adopt a healthier lifestyle and achieve energy-saving effects.

[0003] Among them, electric flame stoves, as a new type of household appliance, have gradually become popular in people's daily lives. Electric flame stoves can cook food, replacing the traditional method of heating with chemical fuels such as natural gas. Electric flame stoves achieve the effect of cooking food only through energy conversion, which not only reduces people's dependence on fossil fuels, but also does not produce any toxic or harmful gases during the heating process, which is a completely clean combustion process, and greatly improves the utilization and conversion rate of electrical energy. Combining these many advantages, electric flame stoves will have a significant positive impact on people's home life in the future.

[0004] The burner intake fan of existing electric flame stoves uses a constant power supply voltage. Regardless of the load size and temperature of the anode needle, the fan speed remains unchanged, making it difficult to obtain relatively stable air pressure and air volume at the burner. For example, when the "firepower" is low, the large airflow can easily affect the normal generation of plasma, affecting the normal performance of the electric flame stove, and also causing loud noise during ignition and flame emission.

[0005] When the "firepower" is high, the small airflow is insufficient to ionize enough gas. At the same time, the ionized plasma is not ejected from the flame tube in time to heat the cookware, resulting in energy waste and overheating of the burner, which shortens the lifespan of the burner.

[0006] Therefore, in this utility model patent application, the applicant has carefully studied a stove fan control circuit structure to solve the above problems. Utility Model Content

[0007] This utility model addresses the shortcomings of the existing technology by providing a burner fan control circuit structure. It controls the burner power by controlling the speed of the burner fan through PWM. On the one hand, it can reduce the noise generated during the ignition and flame emission of the electric flame stove. On the other hand, it can provide the burner with stable air pressure and air volume, reduce ozone, and make the flame of the electric flame stove more stable, thereby improving the thermal efficiency conversion.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A stove fan control circuit structure includes a main control circuit, a power sampling circuit for collecting stove power, and a fan speed control circuit for receiving PWM signals and controlling the stove fan.

[0010] The main control circuit is connected to the power sampling circuit and the fan speed control circuit respectively. After receiving the signal from the power sampling circuit, it outputs the corresponding PWM signal to the fan speed control circuit, thereby controlling the speed of the burner fan.

[0011] As a preferred embodiment, the main control circuit includes a main control chip U3;

[0012] The FEN_PWM pin of the main control chip U3 is connected to the wind speed control circuit, and the IIC_SDA and IIC_SCL pins of the main control chip U3 are both connected to the power sampling circuit.

[0013] As a preferred option, the FEN_FG pin of the main control chip U3 is used to connect to the burner fan to obtain the burner fan speed signal.

[0014] As a preferred embodiment, the system also includes a fan interface circuit for connecting the burner fan, wherein the output of the wind speed control circuit is connected to the fan interface circuit to connect the burner fan via the fan interface circuit.

[0015] As a preferred embodiment, the fan interface circuit includes an interface J3, a diode D3, and a resistor R46;

[0016] Pin 1 of interface J3 is connected to the negative terminal of diode D3. The positive terminal of diode D3 is used to connect to the VDD12V voltage terminal. Pin 2 of interface J3 is grounded. Pin 3 of interface J3 is connected to the output terminal of the wind speed control circuit. Pin 4 of interface J3 is connected to the main control circuit through resistor R46.

[0017] As a preferred embodiment, the wind speed control circuit includes resistors R18, R25, R32, R25 and transistor Q8;

[0018] The collector of transistor Q8 is used to connect to the burner fan. One end of resistor R18 and one end of resistor R749 are both connected to the collector of transistor Q8. The other end of resistor R18 is used to connect to the VDD5V voltage terminal.

[0019] The emitter of transistor Q8 is grounded, and the base of transistor Q8 is connected to the main control circuit through resistor R25. The main control circuit is grounded through resistor R32.

[0020] As a preferred embodiment, the wind speed control circuit includes resistors R749, R25, R32, R25 and transistor Q8;

[0021] The collector of transistor Q8 is used to connect to the burner fan. One end of resistor R18 and one end of resistor R749 are both connected to the collector of transistor Q8. The other end of resistor R749 is used to connect to the VDD3V3 voltage terminal.

[0022] The emitter of transistor Q8 is grounded, and the base of transistor Q8 is connected to the main control circuit through resistor R25. The main control circuit is grounded through resistor R32.

[0023] This utility model has significant advantages and beneficial effects compared with the prior art, specifically:

[0024] Its main function is to have a power sampling circuit collect the power of the burner head and send it to the main control circuit. The main control circuit outputs a corresponding PWM signal to the fan speed control circuit, which in turn controls the speed of the burner head fan. This allows the power of the burner head to be controlled by the speed of the burner head fan through PWM control. On the one hand, it can reduce the noise generated when the electric flame stove is ignited and sprays flames. On the other hand, it can allow the burner head to obtain stable wind pressure and air volume, reduce ozone, and make the flame of the electric flame stove more stable, thereby improving the thermal efficiency conversion.

[0025] To more clearly illustrate the structural features and effects of the present invention, a detailed description is provided below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0026] Figure 1 This is a general control principle block diagram of an embodiment of the present invention.

[0027] Figure 2 This is a partial circuit diagram of an embodiment of the present invention (for a stove fan with a working voltage of 5V).

[0028] Figure 3 This is a partial circuit diagram of another embodiment of the present invention (for a stove fan with an operating voltage of 3.3V).

[0029] Figure 4 This is a schematic diagram of a 5V power supply circuit according to an embodiment of this utility model.

[0030] Figure 5 This is a schematic diagram of a 3.3V power supply circuit according to an embodiment of the present invention.

[0031] Explanation of icon numbers:

[0032] 11. Main control circuit 12. Power sampling circuit

[0033] 13. Wind speed control circuit 14. Fan interface circuit

[0034] 15. Power sampling interface circuit

[0035] 20. Stove head fan. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] like Figures 1 to 5 As shown, a control circuit structure for a burner fan 20 is mainly used in electric flame stoves. It includes a main control circuit 11, a power sampling circuit 12 for collecting burner power, and a wind speed control circuit 13 for receiving PWM signals and controlling the burner fan 20.

[0038] The main control circuit 11 is connected to the power sampling circuit 12 and the wind speed control circuit 13 respectively. After receiving the signal from the power sampling circuit 12, it outputs the corresponding PWM signal to the wind speed control circuit 13, thereby controlling the speed of the burner fan 20.

[0039] In this embodiment, as Figure 2 As shown, the main control circuit 11 includes a main control chip U3;

[0040] The FEN_PWM pin of the main control chip U3 is connected to the fan speed control circuit 13, and the IIC_SDA and IIC_SCL pins of the main control chip U3 are both connected to the power sampling circuit 12. The FEN_FG pin of the main control chip U3 is used to connect to the burner fan 20 to obtain the speed signal of the burner fan 20.

[0041] It also includes a fan interface circuit 14 for connecting the burner fan 20 and a power supply circuit for power supply. The output terminal of the wind speed control circuit 13 is connected to the fan interface circuit 14 to connect the burner fan 20 through the fan interface circuit 14.

[0042] In this embodiment, as Figure 2 As shown, the fan interface circuit 14 includes an interface J3, a diode D3, and a resistor R46;

[0043] Pin 1 of interface J3 is connected to the negative terminal of diode D3. The positive terminal of diode D3 is used to connect to the VDD12V voltage terminal. The positive terminal of diode D3 is connected to the VDD12V voltage terminal through ferrite bead FB4.

[0044] Pin 2 of interface J3 is grounded, and pin 3 of interface J3 is connected to the output of wind speed control circuit 13. Preferably, pin 3 of interface J3 is connected to the output of wind speed control circuit 13 through ferrite bead FB5.

[0045] Pin 4 of interface J3 is connected to the main control circuit 11 via resistor R46. Preferably, the FEN_FG pin of the main control chip U3 is connected to pin 4 of interface J3 via resistor R46 to obtain the speed signal of the stove fan 20.

[0046] In this embodiment, as Figure 2 As shown, for a stove fan with a working voltage of 5V, the wind speed control circuit 13 includes resistors R18, R25, R32, and transistor Q8.

[0047] The collector of transistor Q8 is used to connect to the burner fan 20. One end of resistor R18 and one end of resistor R749 are both connected to the collector of transistor Q8. The other end of resistor R18 is used to connect to the VDD5V voltage terminal of the power supply circuit.

[0048] The emitter of transistor Q8 is grounded, and the base of transistor Q8 is connected to the main control circuit 11 through resistor R25. The main control circuit 11 is grounded through resistor R32. Preferably, the base of transistor Q8 is connected to the FEN_PWM pin of the main control chip U3 through resistor R25, and the FEN_PWM pin of the main control chip U3 is grounded through resistor R32. The FEN_PWM pin of the main control chip U3 sends a PWM signal to the wind speed control circuit 13, and the collector of transistor Q8 sends a corresponding signal to pin 3 of interface J3 of the fan interface circuit 14.

[0049] In another embodiment, such as Figure 3 As shown, it is a stove fan with a working voltage of 3.3V. The difference is that the resistor R18 and the VDD5V voltage terminal are replaced with resistor R749 and VDD3V3 voltage terminal, respectively.

[0050] The power supply circuit includes a 5V power supply circuit for converting 12V to 5V and a 3.3V power supply circuit for converting 5V to 3.3V. The output terminal of the 5V power supply circuit is the VDD5V voltage terminal of the power supply circuit. The output terminal of the 5V power supply circuit is connected to the 3.3V power supply circuit. The output terminal of the 3.3V power supply circuit is the VDD3V3 voltage terminal of the power supply circuit.

[0051] In this embodiment, the power sampling circuit 12 acquires the burner head power through the power sampling interface circuit 15. For example... Figure 2 As shown, the IIC_SDA and IIC_SCL pins of the chip U9 in the power sampling circuit 12 are respectively connected to the IIC_SDA and IIC_SCL pins of the main control chip U3 to send the collected signals to the main control circuit 11.

[0052] like Figure 2As shown, pin 1 of interface J1 of power sampling interface circuit 15 is connected to chip U9 of power sampling circuit 12 through resistor R775, pin 2 of interface J1 of power sampling interface circuit 15 is connected to chip U9 of power sampling circuit 12 through resistor R776, pin 3 of interface J1 of power sampling interface circuit 15 is connected to the VBUS pin of chip U9 of sampling circuit through resistor R777, and the VBUS pin of chip U9 of sampling circuit is also grounded through capacitor C391.

[0053] In this embodiment, the electric flame stove includes a burner head, a high-voltage transformer, and a drive board for driving the high-voltage transformer. The burner head includes a voltage doubler rectifier board and multiple plasma torches. The voltage doubler rectifier board is equipped with multiple sets of voltage doubler rectifier units, which are connected in parallel. Each set of voltage doubler rectifier units is electrically connected between a single plasma torch and the high-voltage transformer. On the drive board, the bus voltage directly drives the full bridge, which in turn drives the high-voltage transformer. Therefore, in this embodiment, the output power of the burner head can be determined by collecting the bus current and bus voltage of the drive board. Pins 1 and 2 of interface J1 of the power sampling interface circuit 15 are used to collect the bus current of the drive board, and pin 3 of interface J1 of the power sampling interface circuit 15 is used to collect the bus voltage of the drive board.

[0054] The key design features of this invention are as follows: the power sampling circuit collects the power of the burner head and sends it to the main control circuit. The main control circuit outputs a corresponding PWM signal to the fan speed control circuit, which then controls the speed of the burner head fan. This allows the power of the burner head to be controlled by the PWM-controlled fan speed. On the one hand, this reduces the noise generated during the ignition and flame emission of the electric flame stove. On the other hand, it allows the burner head to obtain stable air pressure and air volume, reduces ozone, and makes the flame of the electric flame stove more stable, thus improving the thermal efficiency conversion.

Claims

1. A stove head fan control circuit structure, characterized in that: It includes a main control circuit, a power sampling circuit for collecting the power of the burner head, and a fan speed control circuit for receiving PWM signals and controlling the burner head fan. The main control circuit is connected to the power sampling circuit and the fan speed control circuit respectively. After receiving the signal from the power sampling circuit, it outputs the corresponding PWM signal to the fan speed control circuit, thereby controlling the speed of the burner fan.

2. The burner fan control circuit structure according to claim 1, characterized in that: The main control circuit includes a main control chip U3; The FEN_PWM pin of the main control chip U3 is connected to the wind speed control circuit, and the IIC_SDA and IIC_SCL pins of the main control chip U3 are both connected to the power sampling circuit.

3. The burner fan control circuit structure according to claim 2, characterized in that: The FEN_FG pin of the main control chip U3 is used to connect to the burner fan to obtain the burner fan speed signal.

4. The burner fan control circuit structure according to claim 1, characterized in that: It also includes a fan interface circuit for connecting the burner fan, wherein the output of the wind speed control circuit is connected to the fan interface circuit to connect the burner fan through the fan interface circuit.

5. The burner fan control circuit structure according to claim 4, characterized in that: The fan interface circuit includes interface J3, diode D3 and resistor R46; Pin 1 of interface J3 is connected to the negative terminal of diode D3. The positive terminal of diode D3 is used to connect to the VDD12V voltage terminal. Pin 2 of interface J3 is grounded. Pin 3 of interface J3 is connected to the output terminal of the wind speed control circuit. Pin 4 of interface J3 is connected to the main control circuit through resistor R46.

6. The burner fan control circuit structure according to claim 1, characterized in that: The wind speed control circuit includes resistors R18, R25, R32, and R25, and transistor Q8. The collector of transistor Q8 is used to connect to the burner fan. One end of resistor R18 and one end of resistor R749 are both connected to the collector of transistor Q8. The other end of resistor R18 is used to connect to the VDD5V voltage terminal. The emitter of transistor Q8 is grounded, and the base of transistor Q8 is connected to the main control circuit through resistor R25. The main control circuit is grounded through resistor R32.

7. The burner fan control circuit structure according to claim 1, characterized in that: The wind speed control circuit includes resistors R749, R25, R32, and R25, and transistor Q8. The collector of transistor Q8 is used to connect to the burner fan. One end of resistor R18 and one end of resistor R749 are both connected to the collector of transistor Q8. The other end of resistor R749 is used to connect to the VDD3V3 voltage terminal. The emitter of transistor Q8 is grounded, and the base of transistor Q8 is connected to the main control circuit through resistor R25. The main control circuit is grounded through resistor R32.

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