An atomizer control circuit

Abstract

The utility model provides a kind of atomizer control circuit, it is related to atomizer technical field, including: main control chip, atomization drive circuit, voltage reducing circuit, liquid level detection circuit, fan drive circuit, state display circuit, voice broadcast circuit and digital potentiometer circuit;Voltage reducing circuit is connected with main control chip;Liquid level detection circuit, atomization drive circuit and main control chip are sequentially connected;Main control chip is connected with fan drive circuit, state display circuit, voice broadcast circuit and digital potentiometer circuit respectively;When liquid level state is liquid level sufficient state, main control chip controls digital potentiometer circuit adjustment output resistance, controls the driving power of atomization piece;When liquid level state is liquid level insufficient state, main control chip controls digital potentiometer circuit to close output, stop atomization drive.The utility model can effectively prevent atomization piece dry burning damage, improve atomization efficiency and use safety.

Description

Technical Field

[0001] This utility model relates to the field of atomizer technology, and in particular to an atomizer control circuit. Background Technology

[0002] The atomizer control circuit is the core circuit system used for power management, power regulation, and operation control of various functional modules inside the atomizer. It is mainly used to achieve precise adjustment of the driving power of the atomizing plate, thereby ensuring the safety, stability, and user-friendliness of the atomization process.

[0003] With the widespread application of atomizers in medical, home humidification, and aromatherapy fields, there are precise requirements for the atomization volume, energy efficiency, and safety of atomizers. Therefore, developing an atomizer control circuit with digital power adjustment, automatic liquid level detection, fan linkage control, and status indication functions is a necessary technical approach to improve product performance and market competitiveness.

[0004] However, existing atomizer control circuits generally use mechanical potentiometers or fixed resistors to adjust the atomization power, resulting in low control accuracy. They are also greatly affected by component aging, mechanical errors, and environmental factors, leading to unstable atomization volume and difficulty in achieving precise control. At the same time, they lack liquid level detection and intelligent linkage functions, and will continue to drive the atomizing plate when the liquid storage is insufficient, which can easily cause dry burning damage and energy waste. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model embodiment is to provide an atomizer control circuit that can solve the problems of existing atomizer control circuits that generally use mechanical potentiometers or fixed resistors to adjust atomization power, resulting in low control accuracy and being greatly affected by component aging, mechanical errors and environmental factors, leading to unstable atomization volume and difficulty in achieving precise control. At the same time, they lack liquid level detection and intelligent linkage functions, and will continue to drive the atomizing plate when the liquid storage is insufficient, which can easily cause dry burning damage and energy waste.

[0006] This utility model embodiment proposes an atomizer control circuit, including: a main control chip, a step-down circuit, an atomization drive circuit, a liquid level detection circuit, a fan drive circuit, a status display circuit, a voice broadcast circuit, and a digital potentiometer circuit. The step-down circuit is connected to the main control chip; The liquid level detection circuit, the atomization drive circuit, and the main control chip are connected in sequence; The main control chip is connected to the fan drive circuit, the status display circuit, the voice broadcast circuit, and the digital potentiometer circuit, respectively. The liquid level detection circuit is used to detect the liquid level status; When the liquid level is sufficient, the main control chip controls the digital potentiometer circuit to adjust the output resistance, controls the driving power of the atomizing plate, the fan drive circuit controls the fan to run to generate airflow, the status display circuit displays the atomizer status, and the voice broadcast circuit outputs corresponding voice prompts according to the atomizer status. When the liquid level is insufficient, the main control chip controls the digital potentiometer circuit to shut off its output and stop the atomization drive. The fan drive circuit controls the fan to stop running. The status display circuit displays the atomizer status. The voice broadcast circuit outputs corresponding voice prompts based on the atomizer status.

[0007] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following: In this embodiment of the invention, the liquid level detection circuit monitors the liquid storage status in real time. The main control chip can automatically determine whether to start or stop the atomization function based on the liquid level signal line. The output resistance is adjusted by a digital potentiometer to achieve precise control of the atomization power. The fan drive circuit runs the fan synchronously during atomization to improve the diffusion efficiency of the atomized airflow. The status display circuit and voice broadcast circuit output working or low liquid prompts. By integrating the step-down circuit, liquid level detection circuit, fan drive circuit, status display circuit, voice broadcast circuit, and digital potentiometer circuit, this invention can effectively prevent the atomizing plate from burning out, improve atomization efficiency and safety, enhance the user interaction experience, and achieve high integration, intelligence, and reliable operation of the atomizer. Attached Figure Description

[0008] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention. Throughout the drawings, the same reference numerals denote the same components. Obviously, the drawings described below are merely some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of an atomizer control circuit provided in an embodiment of this utility model.

[0010] Figure 2 This is a schematic diagram of the structure of a first step-down circuit provided in an embodiment of this utility model.

[0011] Figure 3 This is a schematic diagram of a second step-down circuit provided in an embodiment of the present invention.

[0012] Figure 4 This is a schematic diagram of a third step-down circuit provided in an embodiment of this utility model.

[0013] Figure 5 This is a schematic diagram of a digital potentiometer circuit provided in an embodiment of this utility model.

[0014] Figure 6 This is a schematic diagram of the structure of an atomization driving circuit provided in an embodiment of this utility model.

[0015] Figure 7 This is a schematic diagram of the pin allocation structure of a main control chip provided in an embodiment of this utility model. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solutions in the embodiments of this utility model, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0017] Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts disclosed in this utility model.

[0018] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention.

[0019] Reference manual attached Figures 1 to 7 The present invention provides a structure for an atomizer control circuit, comprising: a main control chip, a step-down circuit, an atomization drive circuit, a liquid level detection circuit, a fan drive circuit, a status display circuit, a voice broadcast circuit, and a digital potentiometer circuit.

[0020] The step-down circuit is connected to the main control chip.

[0021] The liquid level detection circuit, atomization drive circuit, and main control chip are connected in sequence.

[0022] The main control chip is connected to the fan drive circuit, status display circuit, voice broadcast circuit, and digital potentiometer circuit, respectively.

[0023] The liquid level detection circuit is used to detect the liquid level status.

[0024] When the liquid level is sufficient, the main control chip controls the digital potentiometer circuit to adjust the output resistance, controls the driving power of the atomizing plate, the fan drive circuit controls the fan to run to generate airflow, the status display circuit displays the atomizer status, and the voice broadcast circuit outputs corresponding voice prompts according to the atomizer status.

[0025] When the liquid level is low, the main control chip controls the digital potentiometer circuit to shut off the output and stop the atomization drive. The fan drive circuit controls the fan to stop running. The status display circuit displays the atomizer status, and the voice broadcast circuit outputs corresponding voice prompts according to the atomizer status.

[0026] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following: In this embodiment of the invention, the liquid level detection circuit monitors the liquid storage status in real time. The main control chip can automatically determine whether to start or stop the atomization function based on the liquid level signal line. The output resistance is adjusted by a digital potentiometer to achieve precise control of the atomization power. The fan drive circuit runs the fan synchronously during atomization to improve the diffusion efficiency of the atomized airflow. The status display circuit and voice broadcast circuit output working or low liquid prompts. By integrating the step-down circuit, liquid level detection circuit, fan drive circuit, status display circuit, voice broadcast circuit, and digital potentiometer circuit, this invention can effectively prevent the atomizing plate from burning out, improve atomization efficiency and safety, enhance the user interaction experience, and achieve high integration, intelligence, and reliable operation of the atomizer.

[0027] In one possible implementation, the step-down circuit specifically includes: a first step-down circuit, a second step-down circuit, and a third step-down circuit.

[0028] It should be noted that by designing the step-down circuit as a first step-down circuit, a second step-down circuit, and a third step-down circuit in sequence, multi-stage voltage regulation can be achieved. This allows the high-voltage input to be stepped down step by step to provide matching voltages for different functional modules. This not only reduces the voltage drop and heat generation of individual components and improves the power utilization and stability of the system, but also effectively reduces electromagnetic interference and ensures the reliable operation of the entire atomizer control circuit.

[0029] In this embodiment of the invention, the step-down circuit uses LM2596 to step down 35V to 24V, L78M05 to step down 24V to 5V, and then AMS1117 to step down 5V to 3.3V to power the MCU and digital potentiometers.

[0030] The specific components of the LM2596 power supply section are as follows: Input filtering and overvoltage protection module: This module includes input connector CN8, transient voltage suppression diode D9, and input filter capacitors CIN and C11. Pin 1 of CN8 is connected to the positive input power supply, and pin 2 is grounded. D9 (SMBJ36CA) is connected between the positive input terminal and ground, and its breakdown voltage is 36V. A large-capacity electrolytic capacitor CIN (470uF / 35V) and a high-frequency decoupling capacitor C11 (1uF) are connected in parallel at the input terminal to jointly complete filtering and energy storage.

[0031] Core Module of Switching Regulator: This module is based on the switching regulator chip U9 (LM2596S-ADJ) and includes a freewheeling diode D2 (1N5821RLG) and an energy storage inductor L4 (47uH). The VIN pin of U9 is connected to the output of the input filter module, the OUT pin is connected to the output terminal through inductor L4, and the GND pin is grounded. The anode of the freewheeling diode D2 is connected between the OUT pin of U9 and the inductor L4, and the cathode is connected to the output terminal.

[0032] Adjustable Output and Feedback Module: This module includes an output filter capacitor COUT (470uF) and a feedback voltage divider network consisting of high-precision resistors R7 (1kΩ) and R8 (18.6kΩ). The center point of the voltage divider network (the connection point of R7 and R8) is connected to the feedback pin of U9. The output voltage Vout is determined by the formula Vout≈1.23V(1+R8 / R7). By selecting high-precision resistors (e.g., 1% accuracy), precise output voltage setting can be achieved.

[0033] Enable Control and Soft-Start Module: This module includes an enable control signal line interface (ON / OFF), pull-up resistor R4, current-limiting resistor R5 (10kΩ), capacitor C (100nF), and optional resistor R48 (0Ω). The U9's ON / OFF pin receives the control signal line through this module. When connected via resistor R48, the ON / OFF pin is pulled high, and the circuit operates normally. When external control is required, R48 is removed, and control is achieved via the ON / OFF signal line: high level enables, low level disables. Capacitor C and R5 form a soft-start circuit, slowing the rise time of the ON / OFF pin voltage upon power-up, thus achieving a soft start for the chip and effectively suppressing inrush current.

[0034] In one possible implementation, the first step-down circuit specifically includes: connector CN8, diode D9, step-down control chip U9, diode D2, inductor L4, filter capacitor CIN, filter capacitor C11, filter capacitor COUT, resistor R8, resistor R7, compensation capacitor C10, and resistor R48.

[0035] Pin 1 of connector CN8 is grounded, pin 2 of connector CN8 is connected to the cathode of diode D9, and the anode of diode D9 is grounded.

[0036] The positive terminal of the filter capacitor CIN is connected to a 35V input voltage, and the negative terminal of the filter capacitor CIN is grounded.

[0037] The filter capacitors CIN and C11 are connected in parallel.

[0038] The VIN pin of the buck controller chip U9 is connected to a 35V input voltage.

[0039] The OUT pin of the buck control chip U9 is connected to the first end of the inductor L4, the second end of the inductor L4 is connected to the positive terminal of the filter capacitor COUT, and the negative terminal of the filter capacitor COUT is grounded.

[0040] The filter capacitor COUT is connected in parallel between the output terminal and ground to smooth the output voltage.

[0041] The FB pin of the buck controller chip U9 is connected to the first end of resistor R7, and the second end of resistor R7 is grounded.

[0042] The ON / OFF pin of the step-down control chip U9 is connected to the first end of resistor R48, and the second end of resistor R48 is grounded.

[0043] The first terminal of resistor R8 is connected to the positive terminal of filter capacitor COUT, and the second terminal of resistor R8 is connected to the first terminal of resistor R7.

[0044] The compensation capacitor C10 is connected in parallel with the resistor R8.

[0045] In one possible implementation, the second step-down circuit specifically includes: a voltage regulator chip U5, a resistor R11, an inductor L7, a filter capacitor C12, and a filter capacitor C13.

[0046] The first terminal of inductor L7 is connected to a 24V input voltage, and the second terminal of inductor L7 is connected to the first terminal of resistor R11.

[0047] The IN pin of voltage regulator chip U5 is connected to the second end of resistor R11, the GND pin of voltage regulator chip U5 is grounded, and the OUT pin of voltage regulator chip U5 is connected to the 5V output voltage.

[0048] One end of the filter capacitor C12 is connected to the IN pin of the voltage regulator chip U5, and the other end of the filter capacitor C12 is grounded.

[0049] One end of the filter capacitor C13 is connected to the OUT pin of the voltage regulator chip U5, and the other end of the filter capacitor C13 is grounded.

[0050] In one possible implementation, the third step-down circuit specifically includes: a voltage regulator chip U6, inductors L10 and L9, capacitors C14, C15, C16, C17, C18, and C19, a light-emitting diode LED3, and a resistor R14.

[0051] The first terminal of inductor L10 is connected to a 5V input voltage, and capacitors C15, C16, and C17 are all connected to the second terminal of inductor L10.

[0052] The positive terminal of capacitor C14 is connected to the first terminal of inductor L10, and the negative terminal of capacitor C14 is grounded.

[0053] The VIN pin of the voltage regulator chip U6 is connected to the second terminal of L10, and the GND pin of the voltage regulator chip U6 is grounded.

[0054] After capacitors C18 and C19 are connected in parallel, one end is connected to the VOUT pin of the voltage regulator chip U6, and the other end is grounded.

[0055] The first terminal of inductor L9 is connected to the 3.3V output voltage, the second terminal of inductor L9 is connected to the positive terminal of LED3, the negative terminal of LED3 is connected to the first terminal of resistor R14, and the second terminal of resistor R14 is grounded.

[0056] The second end of inductor L9 is connected to the VOUT pin of voltage regulator chip U6.

[0057] In one possible implementation, the digital potentiometer control circuit specifically includes: a digital potentiometer U11, a filter capacitor C21, a resistor R46, a resistor R47, a 3.3V power supply node, an I2C_SCL signal line, an I2C_SDA signal line, and a connector CN4.

[0058] The VDD pin of digital potentiometer U11 is connected to a 3.3V input voltage, and the GND pin of digital potentiometer U11 is grounded.

[0059] The SCL pin of digital potentiometer U11 is connected to the first end of resistor R46, and the second end of resistor R46 is connected to the I2C_SCL signal line.

[0060] The SDA pin of digital potentiometer U11 is connected to the first end of resistor R47, and the second end of resistor R47 is connected to the I2C_SDA signal line.

[0061] The W pin of digital potentiometer U11 is connected to the W pin of connector CN4.

[0062] The B pin of digital potentiometer U11 is connected to the B pin of connector CN4.

[0063] The first terminal of the filter capacitor C21 is connected to the 3.3V power supply node, and the second terminal of the filter capacitor C21 is grounded.

[0064] It should be noted that by using a digital potentiometer control circuit consisting of a digital potentiometer U11 and its matching filter capacitor and current-limiting resistor, the output resistance value can be precisely and programmably adjusted under the control of the I²C bus of the main control chip. Compared with traditional mechanical potentiometers, it has the advantages of high adjustment accuracy, good repeatability, long life and remote control. At the same time, with the addition of filtering and current-limiting design, communication interference can be effectively suppressed to ensure stable and reliable circuit operation.

[0065] In this embodiment of the invention, the SCL pin of the digital potentiometer U11 (AD5246BKSZ50-RL7SCL), i.e., the serial clock line, is connected to the I2C_SCL signal line of the main controller via a 0-ohm resistor R46. The SCL line is a clock signal line generated by the main controller for synchronous data transmission. The SDA pin of the digital potentiometer U11, i.e., the serial data line, is connected to the I2C_SDA signal line of the main controller via a 0-ohm resistor R47. The SDA line is used for bidirectional transmission of data and address information between the main controller and U11. R46 and R47 (0Ω) are for ease of debugging or production; in standard applications, they can be directly shorted with a wire. If it is necessary to troubleshoot I²C bus problems, these resistors can be removed to disconnect the device for measuring the bus signal lines. Sometimes they are also replaced with small-value resistors (such as 22Ω) for slight impedance matching or current limiting.

[0066] The main controller (such as a microcontroller or CPU) sends instruction data to the U11 chip via the I²C bus (I2C_SCL and I2C_SDA). This instruction data includes an 8-bit value (0-255) used to set the position of the tap (W) of the internal sliding rheostat. Based on the received value, the U11 chip internally changes the resistance between its B and W terminals. Ultimately, a programmable resistor is obtained between the B and W pins of connector CN4. Its resistance is R_BW = (D / 256)50kΩ, where D is the value (0-255) sent by the main controller. This allows for precise adjustment of the atomizer's base current limiting resistance, thus accurately reproducing the current at different atomization rates. This digital potentiometer is connected to the atomizer plate connector H1 via CN4.

[0067] In one possible implementation, the atomization driving circuit specifically includes: a power transistor Q1, a freewheeling diode D1, an atomizing plate TD1, an inductor L2, an inductor L3, a coupling capacitor C6, a filter capacitor C1, a filter capacitor C3, a filter capacitor C7, a filter capacitor C8, a filter capacitor C9, resistors R1, R2, R3, R4, R5, an adjustable resistor VR2, a resistor R6, a resistor R7, connectors CN1, CN2, CN3, and an interface H1.

[0068] The input terminal of connector CN1 is connected to an external DC power supply of 36V.

[0069] The emitter of power transistor Q1 is connected to the first terminal of resistor R6, the second terminal of resistor R6 is connected to the first terminal of resistor R7, the first terminal of resistor R7 is connected to the first terminal of inductor L3, and the second terminal of inductor L3 is grounded.

[0070] The positive terminal of the freewheeling diode D1 is connected to the emitter of the power transistor Q1, and the negative terminal of the freewheeling diode D1 is connected to the collector of the power transistor Q1.

[0071] Pin 1 of the atomizing plate TD1 is connected to the first terminal of the filter capacitor C3. The second terminal of the filter capacitor C3 is connected to the base of the power transistor Q1. The second terminal of the filter capacitor C3 is connected to the first terminal of the resistor R1. The second terminal of the resistor R1 is connected to pin 2 of the atomizing plate TD1.

[0072] Pin 2 of the atomizing plate TD1 is connected to the first terminal of the filter capacitor C7. The second terminal of the filter capacitor C7 is connected to the first terminal of the resistor R2. The second terminal of the resistor R2 is connected to the first terminal of the filter capacitor C8. The second terminal of the filter capacitor C8 is connected to the first terminal of the inductor L2.

[0073] The second end of inductor L2 is connected to the first end of coupling capacitor C6. The second end of coupling capacitor C6 is connected to pin 1 of connector CN2. Pin 2 of connector CN2 is connected to the first end of resistor R4. The second end of resistor R4 is connected to the sliding end of adjustable resistor VR2. The other end of adjustable resistor VR2 is connected to the first end of resistor R3. The second end of resistor R3 is connected to pin 1 of interface H1. Pin 2 of interface H1 is connected to the first end of resistor R5. The second end of resistor R5 is grounded.

[0074] Pin 1 of connector CN3 is grounded, and pin 2 of connector CN3 is connected to pin 2 of connector CN2.

[0075] In this circuit, power transistor Q1 is a high-frequency NPN power transistor and the core switching element, switching on and off at a high speed of 1.7MHz. The atomizing plate TD1 is a 1.7MHz atomizing plate; this piezoelectric ceramic atomizing plate oscillates at high frequency to break water into small droplets. R6 and R7 are 0-ohm resistors, typically used as jumpers or to provide space for circuit debugging (such as measuring current with a small resistor in series), and may provide a bias path to the base of Q1.

[0076] The coupling capacitor C6 (2A103J), where 2A represents a 100V withstand voltage and 103 represents 10nF (0.01uF), serves the following purpose: 1. Block DC and allow AC to pass through, to prevent DC components from damaging the atomizing plate.

[0077] 2. Impedance matching: Matches the capacitive impedance of the atomizing plate to enable more efficient energy transfer.

[0078] It should be noted that by employing an atomization drive circuit composed of a power transistor, a freewheeling diode, a coupling capacitor, an inductor, a multi-stage filter, and a resistor network, the atomizing plate can be stably driven under high-frequency conditions, achieving efficient energy transfer and smooth control of atomization output. The freewheeling diode effectively suppresses turn-off voltage spikes, the coupling capacitor achieves DC blocking and impedance matching, and the filter and current-limiting network improves the circuit's anti-interference capabilities and driving efficiency, thereby significantly enhancing the atomizer's stability, safety, and atomization effect.

[0079] In this embodiment of the invention, the pin assignment of the main control chip is as follows: Pin 1 of the main control chip is connected to the I2C_SCL signal line, used for communication with the AD5246 digital potentiometer. Pin 2 is connected to the I2C_SDA signal line, used for data exchange with the AD5246. Pin 3 is connected to the KEY_TIME- signal line. Pin 4 is connected to the 3.3V input voltage, used to provide power to the main control chip. Pin 5 is grounded. Pin 6 is connected to the REST signal line. Pin 7 is connected to the DIN signal line. Pin 8 is connected to the SIB signal line via resistor R53, and also to the SPI_SCK signal line via resistor R50. Pin 9 is connected to the SPI_CS signal line via resistor R51, and also to the BEEP signal line via resistor R54. Pin 10 is connected to the CLK signal line. Pin 11 of the main control chip is connected to the signal line LIQD_DETECT, used to receive the output signal line of the liquid level detection circuit. Pin 12 of the main control chip is connected to the signal line SPK_DATA, used to send control signal lines to the voice broadcast circuit. Pin 13 of the main control chip is connected to the signal line SPK_BUSY through resistor R52, and pin 13 is connected to the SPI_SI signal line through resistor R55. Pin 14 of the main control chip is connected to the signal line FAN, used to control the fan drive circuit. Pin 15 of the main control chip is connected to the signal line KEY_ATM. Pin 16 of the main control chip is connected to the signal line KEY_SPEED. Pin 17 of the main control chip is connected to the signal line KEY_TIME+. Pin 18 of the main control chip is connected to the signal line SWDIO. Pin 19 of the main control chip is connected to the signal line SWCLK. Pin 20 of the main control chip is connected to the signal line KEY_STARTSTOP.

[0080] The working principle of this utility model is as follows: Overvoltage protection: When a transient high voltage exceeding the breakdown voltage of D9 (approximately 36V) occurs at the input port, D9 quickly conducts, dissipating the energy to ground and protecting the U9 chip in the subsequent stage from damage.

[0081] Buck converter: The internal switching transistor of U9 operates in high-frequency switching mode, chopping the input DC voltage and filtering it through L4 and COUT to obtain a smooth, lower voltage output.

[0082] Output regulation: The feedback network samples the output voltage in real time and compares it with the 1.23V reference voltage inside U9. By adjusting the duty cycle of the switch, the output voltage is stabilized at the value set by R7 and R8. For example, when R7=1kΩ and R8=18.6kΩ, Vout≈1.23V(1+18.6 / 1)=24.1V.

[0083] Soft start and enable control: Upon power-on, capacitor C charges through resistor R5, causing the ON / OFF pin voltage to rise slowly. Consequently, the duty cycle of the internal switching transistor U9 increases gradually, resulting in a smooth output voltage build-up and avoiding large inrush currents. An external MCU can manage the power supply switching via the ON / OFF signal line.

[0084] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details are described in detail in the preferred embodiments; however, those skilled in the art can fully understand this utility model without these details. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, and not to limit it. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An atomizer control circuit, characterized in that, include: Main control chip, step-down circuit, atomization drive circuit, liquid level detection circuit, fan drive circuit, status display circuit, voice broadcast circuit, and digital potentiometer circuit; The step-down circuit is connected to the main control chip; The liquid level detection circuit, the atomization drive circuit, and the main control chip are connected in sequence; The main control chip is connected to the fan drive circuit, the status display circuit, the voice broadcast circuit, and the digital potentiometer circuit, respectively. The liquid level detection circuit is used to detect the liquid level status; When the liquid level is sufficient, the main control chip controls the digital potentiometer circuit to adjust the output resistance and control the driving power of the atomizing plate; the fan drive circuit controls the fan to run and generate airflow; the status display circuit displays the atomizer status; and the voice broadcast circuit outputs corresponding voice prompts according to the atomizer status. When the liquid level is insufficient, the main control chip controls the digital potentiometer circuit to shut off its output and stop the atomization drive; the fan drive circuit controls the fan to stop running; the status display circuit displays the atomizer status; and the voice broadcast circuit outputs corresponding voice prompts based on the atomizer status.

2. The atomizer control circuit according to claim 1, characterized in that, The step-down circuit specifically includes: a first step-down circuit, a second step-down circuit, and a third step-down circuit.

3. The atomizer control circuit according to claim 2, characterized in that, The first step-down circuit specifically includes: connector CN8, diode D9, step-down control chip U9, diode D2, inductor L4, filter capacitor CIN, filter capacitor C11, filter capacitor COUT, resistor R8, resistor R7, compensation capacitor C10, and resistor R48. Pin 1 of connector CN8 is grounded, pin 2 of connector CN8 is connected to the cathode of diode D9, and the anode of diode D9 is grounded. The positive terminal of the filter capacitor CIN is connected to a 35V input voltage, and the negative terminal of the filter capacitor CIN is grounded. The filter capacitor CIN and the filter capacitor C11 are connected in parallel; The VIN pin of the buck control chip U9 is connected to the 35V input voltage; The OUT pin of the buck control chip U9 is connected to the first end of the inductor L4, the second end of the inductor L4 is connected to the positive terminal of the filter capacitor COUT, and the negative terminal of the filter capacitor COUT is grounded. The filter capacitor COUT is connected in parallel between the output terminal and ground to smooth the output voltage. The FB pin of the buck control chip U9 is connected to the first end of the resistor R7, and the second end of the resistor R7 is grounded. The ON / OFF pin of the step-down control chip U9 is connected to the first end of the resistor R48, and the second end of the resistor R48 is grounded. The first end of the resistor R8 is connected to the positive terminal of the filter capacitor COUT, and the second end of the resistor R8 is connected to the first end of the resistor R7. The compensation capacitor C10 is connected in parallel with the resistor R8.

4. The atomizer control circuit according to claim 2, characterized in that, The second step-down circuit specifically includes: a voltage regulator chip U5, a resistor R11, an inductor L7, a filter capacitor C12, and a filter capacitor C13; The first terminal of the inductor L7 is connected to a 24V input voltage, and the second terminal of the inductor L7 is connected to the first terminal of the resistor R11. The IN pin of the voltage regulator chip U5 is connected to the second end of the resistor R11, the GND pin of the voltage regulator chip U5 is grounded, and the OUT pin of the voltage regulator chip U5 is connected to a 5V output voltage. One end of the filter capacitor C12 is connected to the IN pin of the voltage regulator chip U5, and the other end of the filter capacitor C12 is grounded. One end of the filter capacitor C13 is connected to the OUT pin of the voltage regulator chip U5, and the other end of the filter capacitor C13 is grounded.

5. The atomizer control circuit according to claim 2, characterized in that, The third step-down circuit specifically includes: a voltage regulator chip U6, inductors L10 and L9, capacitors C14, C15, C16, C17, C18, and C19, an LED3, and a resistor R14. The first terminal of the inductor L10 is connected to a 5V input voltage, and the capacitors C15, C16 and C17 are all connected to the second terminal of the inductor L10. The positive terminal of capacitor C14 is connected to the first terminal of inductor L10, and the negative terminal of capacitor C14 is grounded. The VIN pin of the voltage regulator chip U6 is connected to the second terminal of L10, and the GND pin of the voltage regulator chip U6 is grounded. After capacitors C18 and C19 are connected in parallel, one end of the parallel circuit is connected to the VOUT pin of the voltage regulator chip U6, and the other end is grounded. The first terminal of the inductor L9 is connected to a 3.3V output voltage, the second terminal of the inductor L9 is connected to the positive terminal of the light-emitting diode LED3, the negative terminal of the light-emitting diode LED3 is connected to the first terminal of the resistor R14, and the second terminal of the resistor R14 is grounded. The second end of the inductor L9 is connected to the VOUT pin of the voltage regulator chip U6.

6. The atomizer control circuit according to claim 1, characterized in that, The digital potentiometer circuit specifically includes: digital potentiometer U11, filter capacitor C21, resistor R46, resistor R47, 3.3V power supply node, I2C_SCL signal line, I2C_SDA signal line, and connector CN4; The VDD pin of the digital potentiometer U11 is fed with a 3.3V input voltage, and the GND pin of the digital potentiometer U11 is grounded. The SCL pin of the digital potentiometer U11 is connected to the first end of the resistor R46, and the second end of the resistor R46 is connected to the I2C_SCL signal line. The SDA pin of the digital potentiometer U11 is connected to the first end of the resistor R47, and the second end of the resistor R47 is connected to the I2C_SDA signal line; The W pin of the digital potentiometer U11 is connected to the W pin of the connector CN4; The B pin of the digital potentiometer U11 is connected to the B pin of the connector CN4; The first terminal of the filter capacitor C21 is connected to the 3.3V power supply node, and the second terminal of the filter capacitor C21 is grounded.

7. The atomizer control circuit according to claim 1, characterized in that, The atomization drive circuit specifically includes: power transistor Q1, freewheeling diode D1, atomizing plate TD1, inductor L2, inductor L3, coupling capacitor C6, filter capacitor C1, filter capacitor C3, filter capacitor C7, filter capacitor C8, filter capacitor C9, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, adjustable resistor VR2, resistor R6, resistor R7, connector CN1, connector CN2, connector CN3, and interface H1; The input terminal of connector CN1 is connected to an external DC power supply of 36V; The emitter of the power transistor Q1 is connected to the first terminal of the resistor R6, the second terminal of the resistor R6 is connected to the first terminal of the resistor R7, the first terminal of the resistor R7 is connected to the first terminal of the inductor L3, and the second terminal of the inductor L3 is grounded. The positive terminal of the freewheeling diode D1 is connected to the emitter of the power transistor Q1, and the negative terminal of the freewheeling diode D1 is connected to the collector of the power transistor Q1. Pin 1 of the atomizing plate TD1 is connected to the first terminal of the filter capacitor C3, the second terminal of the filter capacitor C3 is connected to the base of the power transistor Q1, the second terminal of the filter capacitor C3 is connected to the first terminal of the resistor R1, and the second terminal of the resistor R1 is connected to pin 2 of the atomizing plate TD1. Pin 2 of the atomizing plate TD1 is connected to the first terminal of the filter capacitor C7, the second terminal of the filter capacitor C7 is connected to the first terminal of the resistor R2, the second terminal of the resistor R2 is connected to the first terminal of the filter capacitor C8, and the second terminal of the filter capacitor C8 is connected to the first terminal of the inductor L2. The second end of the inductor L2 is connected to the first end of the coupling capacitor C6. The second end of the coupling capacitor C6 is connected to pin 1 of the connector CN2. Pin 2 of the connector CN2 is connected to the first end of the resistor R4. The second end of the resistor R4 is connected to the sliding end of the adjustable resistor VR2. The other end of the adjustable resistor VR2 is connected to the first end of the resistor R3. The second end of the resistor R3 is connected to pin 1 of the interface H1. Pin 2 of the interface H1 is connected to the first end of the resistor R5. The second end of the resistor R5 is grounded. Pin 1 of connector CN3 is grounded, and pin 2 of connector CN3 is connected to pin 2 of connector CN2.

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