PCBA cleaning control circuit and cleaner

Abstract

The utility model discloses a PCBA (Printed Circuit Board Assembly) cleaning control circuit and a cleaner. The circuit comprises a main control circuit for controlling the PCBA cleaning control circuit; the lithium battery charging and power supply circuit is controlled by a high-level enable signal output by the main control circuit to supply power to the PCBA cleaning control circuit; the step-up and step-down direct current conversion circuit is connected with the lithium battery charging and power supply circuit, the step-up and step-down direct current conversion circuit is connected with the main control circuit, and the step-up and step-down direct current conversion circuit is controlled by a PWM signal output by the main control circuit and boosts the voltage output by the lithium battery charging and power supply circuit to a preset working voltage to supply power to the atomization piece control circuit; the atomization sheet control circuit is connected with the main control circuit and the buck-boost direct current conversion circuit, is controlled by a PWM atomization signal output by the main control circuit, and atomizes board cleaning liquid for cleaning the PCBA under a preset working voltage; the cleaning driving circuit is controlled by a PWM cleaning signal of the main control circuit, and the atomized plate cleaning liquid is blown to a PCBA to be cleaned for cleaning.

Description

Technical Field

[0001] The present application relates to the field of semiconductor technology, and in particular to a PCBA cleaning control circuit and a cleaner. Background Art

[0002] With the development of modern electronic science and technology and electronic product manufacturing technology, various intelligent electronic devices, industrial equipment and consumer electronic products have become more colorful, bringing a technological life experience to people's lives, travel, study, work, office and tourism. These electronic products that affect human life and civilization will use the PCBA cleaning process in the electronic product manufacturing process during the research and development, sample production, batch production and after-sales technical maintenance. In particular, people's increasing attention to the environment and environmental protection has led to the development of PCBA automatic cleaning equipment.

[0003] Currently, PCBA automated cleaning equipment is mainly desktop machines, which are generally used in PCBA production factories or SMT factories and SMD factories. However, for enterprises in the early stage of electronic product R&D and sample production, the price of desktop PCBA cleaning equipment in the laboratory is relatively high. The PCBA cleaning of desktop machines requires a certain volume of board washing water to start cleaning, which will cause a certain amount of board washing water waste when cleaning R&D samples. It is also inconvenient for FAE on-site technical support engineers or after-sales engineers to carry it out to maintain and clean PCBA electronic products. Summary of the Invention

[0004] In view of this, the present application provides a PCBA cleaning control circuit and a cleaner in order to solve the above technical problems.

[0005] Specifically, the technical solution of this application is as follows:

[0006] A PCBA cleaning control circuit, comprising:

[0007] A main control circuit configured to control the PCBA cleaning control circuit;

[0008] A lithium battery charging and power supply circuit, controlled by a high-level enable signal output by the main control circuit, supplies power to the PCBA cleaning control circuit;

[0009] The voltage input terminal of the buck-boost DC conversion circuit is connected to the voltage output terminal of the lithium battery charging and power supply circuit. The voltage control terminal of the buck-boost DC conversion circuit is connected to the voltage enable terminal of the main control circuit. The buck-boost DC conversion circuit is controlled by or is controlled by the PWM signal output by the main control circuit to boost the voltage output by the lithium battery charging and power supply circuit to a preset operating voltage to power the atomizer control circuit.

[0010] The atomizing plate control circuit is connected to the main control circuit and the buck-boost DC conversion circuit, and is used to be controlled by the PWM atomization signal output by the main control circuit to atomize the cleaning liquid for cleaning the PCBA at the preset working voltage;

[0011] The cleaning drive circuit is controlled by the PWM cleaning signal output by the main control circuit, blows the atomized cleaning liquid onto the PCBA to be cleaned and cleans the PCBA to be cleaned.

[0012] In some implementations, the lithium battery charging and power supply circuit includes: a lithium battery interface wire, a USB Type C charging interface, a lithium battery charging management chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a third capacitor, and a first NMOS transistor;

[0013] The lithium battery interface wire is connected to the lithium battery;

[0014] The first charging protocol identification end of the USB Type-C charging interface is connected to the first resistor, and the second charging protocol identification end of the USB Type-C charging interface is connected to the second resistor; the first communication end of the USB Type-C charging interface is connected to the third resistor, and the second communication end of the USB Type-C charging interface is connected to the fourth resistor;

[0015] The input end of the lithium battery charging management chip is connected to the first capacitor, to the second capacitor and the fifth resistor in series, and to the sixth resistor and the seventh resistor in parallel, which are connected to the access charging detection end of the main control circuit; the setting end of the lithium battery charging management chip is connected to the eighth resistor; the control end of the lithium battery charging management chip is connected to the drain of the first NMOS tube, the gate of the first NMOS tube is connected to the battery charging enable control end of the main control circuit through the ninth resistor, the gate of the first NMOS tube is also connected to the first end of the tenth resistor, the source of the first NMOS tube is connected to the battery end of the lithium battery charging management chip through the third capacitor, and the source of the first NMOS tube is also connected to the second end of the tenth resistor.

[0016] In some implementations, the buck-boost DC converter circuit includes: a first inductor, a second NMOS transistor, a third NMOS transistor, a fourth NMOS transistor, and a fifth NMOS transistor; a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor; an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor;

[0017] The source of the second NMOS transistor is connected to the first inductor and the drain of the third NMOS transistor, the drain of the second NMOS transistor is connected to the fourth capacitor and the fifth capacitor connected in parallel, and the gate of the second NMOS transistor is connected to the voltage enable terminal of the main control circuit through the eleventh resistor;

[0018] The drain of the third NMOS transistor is connected to the first inductor and the source of the third NMOS transistor, the source of the third NMOS transistor is connected to the fourth capacitor and the fifth capacitor connected in parallel, and the gate of the third NMOS transistor is connected to the voltage enable terminal of the main control circuit through the twelfth resistor;

[0019] The source of the fourth NMOS transistor is connected to the first inductor and the drain of the fifth NMOS transistor, the drain of the fourth NMOS transistor is connected to the sixth capacitor and the seventh capacitor connected in parallel, and the gate of the fourth NMOS transistor is connected to the voltage enable terminal of the main control circuit through the thirteenth resistor;

[0020] The drain of the fifth NMOS transistor is connected to the first inductor and the source of the fourth NMOS transistor, the source of the fifth NMOS transistor is connected to the sixth capacitor and the seventh capacitor in parallel, and the gate of the fifth NMOS transistor is connected to the PWM signal end output by the main control circuit through the fourteenth resistor.

[0021] In some implementations, the atomizer control circuit includes:

[0022] An atomizer drive circuit, comprising: a sixth NMOS transistor, a first diode, a ceramic atomizer, a sixteenth resistor, and a seventeenth resistor;

[0023] The gate of the sixth NMOS tube is connected to the PWM control end of the main control circuit through the first diode and the sixteenth resistor in parallel. The gate of the sixth NMOS tube is also connected to the first end of the seventeenth resistor. The drain of the sixth NMOS tube is connected to the ceramic atomizer plate. The source of the sixth NMOS tube is connected to the second end of the seventeenth resistor.

[0024] In some implementations, the atomizer control circuit further includes:

[0025] an atomizer power control circuit, the atomizer power control circuit comprising a seventh NMOS transistor, an eighth PMOS transistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, and an eighth capacitor;

[0026] The gate of the seventh NMOS transistor is connected to the ceramic atomizer enable terminal of the main control circuit through the eighteenth resistor, the source of the seventh NMOS transistor is grounded, the drain of the seventh NMOS transistor is connected to the gate of the eighth PMOS transistor, and the nineteenth resistor is connected in parallel between the gate of the seventh NMOS transistor and the source of the seventh NMOS transistor;

[0027] The source of the eighth PMOS tube is connected to the voltage output end of the atomizer plate driving circuit, the drain of the eighth PMOS tube is connected to the working voltage input end of the sampling ceramic atomizer plate of the main control circuit through the twenty-first resistor, and the twenty-second resistor and the eighth capacitor are connected in parallel between the twenty-first resistor and the working voltage input end of the sampling ceramic atomizer plate of the main control circuit.

[0028] In some implementations, the method further includes:

[0029] A lithium battery power detection circuit, wherein the lithium battery power detection circuit includes a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a ninth NMOS transistor, a tenth NMOS transistor, and a tenth capacitor;

[0030] The gate of the ninth NMOS transistor is connected to the lithium battery power detection enable terminal of the main control circuit via the twenty-third resistor, the drain of the ninth NMOS transistor is connected to the gate of the tenth NMOS transistor, the source of the ninth NMOS transistor is grounded, and the twenty-fourth resistor is connected to the gate of the ninth NMOS transistor and the source of the ninth NMOS transistor;

[0031] The source of the tenth NMOS tube is connected to the voltage output end of the lithium battery charging and power supply circuit, and the drain of the tenth NMOS tube is connected to the battery voltage end of the sampling ceramic atomizer of the main control circuit through the twenty-sixth resistor.

[0032] In some implementations, the method further includes:

[0033] A low battery alarm circuit includes a twenty-eighth resistor and a first light-emitting diode, one end of the twenty-eighth resistor is connected to the power supply end of the lithium battery charging and power supply circuit, and the other end of the twenty-eighth resistor is connected to the first light-emitting diode to the battery power alarm end of the main control circuit.

[0034] In some implementations, the cleaning drive circuit further includes:

[0035] A DC fan drive circuit is connected to the first PWM drive output terminal of the main control circuit and the voltage output terminal of the lithium battery charging and power supply circuit, and is controlled by the fan drive signal output by the first PWM drive output terminal of the main control circuit to drive the DC fan to work;

[0036] a sweeping motor drive circuit connected to the second PWM drive output terminal of the main control circuit and the voltage output terminal of the lithium battery charging and power supply circuit, and controlled by the fan drive signal output by the second PWM drive output terminal of the main control circuit to drive the sweeping motor to work;

[0037] The DC motor drive circuit is connected to the third PWM drive output terminal of the main control circuit and the voltage output terminal of the lithium battery charging and power supply circuit, and is controlled by the fan drive signal output by the third PWM drive output terminal of the main control circuit to drive the DC motor to work.

[0038] In some implementations, the method further includes:

[0039] The key function input circuit is connected to the main control circuit and the lithium battery charging and power supply circuit, and transmits key pressing and key releasing signals to the main control circuit for detection.

[0040] In some implementations, the present application provides a PCBA cleaner, including: the PCBA cleaning control circuit described above.

[0041] Compared with the prior art, this application has at least one of the following beneficial effects:

[0042] This application is based on a closed-loop connection method of an H-bridge Buck-Boost step-down and step-up circuit and a piezoelectric ceramic atomizer drive circuit to achieve the purpose of adjusting the Buck-Boost step-down and step-up and synchronously detecting the output voltage of the piezoelectric ceramic atomizer drive circuit, thereby synchronously adjusting the output drive voltage of the piezoelectric ceramic atomizer drive circuit to achieve bidirectional synchronous control of the Buck-Boost step-up and step-down process and the output drive voltage of the ceramic atomizer drive circuit, and then synchronously controlling the DC fan to synchronously blow the atomized board washing water to the solder joints of the components on the surface of the PCBA, avoiding the waste of atomized board washing water, thereby achieving the resynchronization of the MCU microcontroller to promptly respond to control the DC motor drive circuit to drive the DC motor to drive the anti-static brush to scrub the flux substances and contaminants remaining on the solder joints on the surface of the PCBA, so as to achieve the best cleaning effect of the PCBA. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present application.

[0044] Figure 1 The exemplary structure of the first PCBA cleaning control circuit provided in some embodiments of the present application is shown;

[0045] Figure 2 1 shows an exemplary structure of a second PCBA cleaning control circuit provided in some embodiments of the present application;

[0046] Figure 3 Shown is a schematic diagram of the workflow in some embodiments of the present application;

[0047] Figure 4 Shows a schematic structural diagram of the main control circuit in some embodiments of the present application;

[0048] Figure 5 A schematic diagram of the structure of a lithium battery charging and power supply circuit in some embodiments of the present application is shown;

[0049] Figure 6 A schematic diagram of the structure of a buck-boost DC conversion circuit in some embodiments of the present application is shown;

[0050] Figure 7 A schematic diagram of the structure of the atomizer drive circuit in some embodiments of the present application is shown;

[0051] Figure 8 A schematic diagram of the structure of the atomizer power control circuit in some embodiments of the present application is shown;

[0052] Figure 9 The following is a schematic diagram showing the structure of a lithium battery power detection circuit in some embodiments of the present application;

[0053] Figure 10 Shows a schematic structural diagram of a low battery alarm circuit in some embodiments of the present application;

[0054] Figure 11 Shows a schematic structural diagram of a DC fan drive circuit in some embodiments of the present application;

[0055] Figure 12 A schematic diagram of the structure of a sweeping motor driving circuit in some embodiments of the present application is shown;

[0056] Figure 13 The following is a schematic diagram showing the structure of a DC motor drive circuit in some embodiments of the present application;

[0057] Figure 14 A structural schematic diagram of a key function input circuit in some embodiments of the present application is shown. DETAILED DESCRIPTION

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. The drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative work. Adjustments and improvements made without departing from the concept of the present application are all within the scope of protection of the present application.

[0059] To simplify the drawings, each figure schematically illustrates only the portions relevant to the corresponding embodiment and does not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, components with identical structures or functions are only partially schematically depicted; in practice, more or fewer components with identical structures or functions may exist.

[0060] In this application, unless otherwise clearly specified and limited, ordinal numbers such as "first" and "second" are only used to distinguish and describe related objects, and cannot be understood as indicating or implying the relative importance or order between related objects; in addition, they do not represent the number of related objects.

[0061] PCBA: PCBA is the abbreviation of Printed Circuit Board Assembly. The entire process of PCB printed circuit board blank board going through SMT mounting, or DIP plug-in or soldering is referred to as PCBA.

[0062] SMT: The abbreviation of Surface Mount Technology, the production line is called surface assembly technology.

[0063] SMD: The abbreviation of Surface Mounted Devices, called surface mount devices.

[0064] MCU: Microcontroller, commonly known as single-chip microcomputer.

[0065] Buck-Boost: Buck-boost converter.

[0066] NMOS: The full English name is N-Metal-Oxide-Semiconductor. It means N-type metal-oxide-semiconductor, and the transistor with this structure is called NMOS transistor.

[0067] PMOS: The full name is positive channel Metal Oxide Semiconductor, abbreviated as PMOS, which is a MOS tube with an n-type substrate and p-channel, relying on the flow of holes to transport current.

[0068] H-bridge: Because the circuit connection looks like the English letter H, it is called "H" bridge.

[0069] A printed circuit board (PCB), also known as a printed circuit board (PCB), is a crucial electronic component that supports and connects electronic components. PCBs are commonly referred to in the industry as "bare boards" or "substrates," meaning they are bare. PCBA (Printed Circuit Board Assembly) refers to the process of soldering electronic components (such as ICs, resistors, capacitors, inductors, LEDs, and crystal oscillators) onto a bare PCB to create a functional hardware board.

[0070] Existing PCBA cleaning equipment is primarily desktop, primarily used for cleaning PCBAs during high-volume production in SMD factories, and its applicability is limited. Field technical support engineers and after-sales engineers also need to perform some degree of cleaning when traveling to maintain PCBA circuit boards. However, desktop PCBA cleaning equipment is bulky and heavy, making it difficult to carry around, and requires a certain amount of cleaning water to start the cleaning process, making it very inconvenient to operate. Furthermore, engineers also need to clean PCBAs during initial soldering and production in the lab for product functional verification and testing. However, equipping a lab with PCBA cleaning equipment is relatively expensive for small businesses.

[0071] In order to solve the problems existing in the prior art, the present application provides a handheld PCBA electric cleaner, which is compact, lightweight, easy to carry, and cost-effective compared to desktop PCBA cleaning equipment. It does not require the addition of a large volume of board washing water, and has certain advantages in R&D sample production and technical support. It is convenient for FAE on-site technical support engineers and after-sales technical engineers to carry it with them to the client to perform technical support or product maintenance to clean PCBA boards. At the same time, compared with desktop PCBA cleaning equipment, it can save board washing water resources and thus save costs. Moreover, because it is handheld and portable and powered by a rechargeable lithium battery, it is not restricted by usage scenarios.

[0072] The PCBA cleaner provided in this application is a portable PCBA electric cleaner, which can include handheld and other portable PCBA electric cleaners. Specifically, it includes a PCBA cleaning control circuit, an atomizing plate, a fan, a brush motor, a cleaning brush, and a sweeping motor.

[0073] The PCBA cleaning control circuit receives the cleaning input instruction, then controls the atomizer and fan to work, and then controls the anti-static brush motor to drive the anti-static cleaning brush to brush the PCBA, and controls the sweeping motor to sweep the anti-static cleaning brush to achieve the purpose of cleaning the PCBA.

[0074] References Figure 1 The structural diagram of the PCBA cleaning control circuit shown in the figure, the present application provides a PCBA cleaning control circuit, specifically including:

[0075] The main control circuit 100 is configured to control the PCBA cleaning control circuit. The lithium battery charging and power supply circuit 200 is configured to receive the power supply control signal of the main control circuit 100 and supply power to the PCBA cleaning control circuit.

[0076] The voltage input terminal of the buck-boost DC conversion circuit 300 is connected to the voltage output terminal of the lithium battery charging and power supply circuit 200, and the voltage control terminal of the buck-boost DC conversion circuit 300 is connected to the voltage enable terminal of the main control circuit 100. Under the control of the PWM signal output by the main control circuit 100, the voltage output of the lithium battery charging and power supply circuit 200 is boosted to a preset operating voltage to power the atomizer control circuit 400.

[0077] The atomizer control circuit 400 is connected to the main control circuit 100 and the buck-boost DC converter circuit 300. Controlled by the PWM atomization signal output by the main control circuit 100, it atomizes the cleaning liquid for cleaning the PCBA at the preset operating voltage. The cleaning drive circuit 500, controlled by the PWM cleaning signal output by the main control circuit, blows the atomized cleaning liquid onto the PCBA to be cleaned, thereby cleaning the PCBA.

[0078] Figure 2 FIG1 shows a schematic diagram of another PCBA cleaning control circuit consistent with some embodiments disclosed in this application. Figure 2 The structural diagram of the PCBA cleaning control circuit shown in FIG. 1 is a schematic diagram of the PCBA cleaning control circuit shown in FIG. 1 . The present application provides a PCBA cleaning control circuit, further comprising:

[0079] The function key input circuit 600 receives the cleaning instruction through the function key input circuit 600 and transmits the cleaning instruction to the main control circuit 100, which controls the PCBA cleaning control circuit to automatically clean the PCBA. Figure 14 , the key function input circuit is connected to the main control circuit and the lithium battery charging and power supply circuit, and transmits the key pressing and key releasing signals to the main control circuit for detection.

[0080] Main program function flow reference of PCBA cleaner Figure 3The function key input circuit includes a two-speed key slide switch. When it slides to the 1-2 position for the first time, the power is turned on, the PCBA electric cleaner starts to be powered, and then the PCBA cleaner performs system initialization. After the PCBA cleaner system initialization is completed, it cyclically determines whether the function key is pressed, whether K2 is pressed for the first time or the second time (after the second press, the key logic counter is reset to restore the first count). If K2 is pressed for the first time, the ceramic atomizer and fan are executed, and then the anti-static brush motor and sweeping vibration motor are executed to achieve the purpose of cleaning the PCBA. If K2 is pressed for the second time, the function key counter is reset, the atomizer, fan, brush motor, and sweeping vibration motor stop working, and the judgment is executed in this cycle until the key slide switch slides to the 2-3 position and the device is shut down.

[0081] The PCBA cleaning control circuit is further configured with a lithium battery monitoring circuit 700 for detecting the battery power signal of the lithium battery charging and power supply circuit, and can also be used to alarm when a low power signal is detected.

[0082] Specifically, the lithium battery monitoring circuit 700 includes a lithium battery circuit detection circuit and a low-battery alarm circuit. The lithium battery circuit detection circuit is used to detect the battery power signal of the lithium battery charging and power supply circuit 200, and the low-battery alarm circuit is used to alarm when the battery power signal of the lithium battery charging and power supply circuit 200 is lower than a preset battery power.

[0083] In some embodiments disclosed in this application, the structural diagram of the main control circuit 100 is shown in FIG. Figure 4 The main control circuit 100 includes an MCU microcontroller, exemplified by the MM32SPIN0230B3TV model. The MCU pins are connected to the functional modules of a handheld PCBA cleaning device via network labels, enabling the MCU to control the coordinated operation of the modules.

[0084] The fifteenth resistor R15 and the ninth capacitor C9 form the MCU reset circuit, providing a power-on reset for the MCU. The forty-first resistor R41 is used to configure the MCU program to boot from Flash upon power-on. The twelfth capacitor C12 and the thirteenth capacitor C13 provide power filtering for the MCU's power supply VBAT_VDD.

[0085] In this application, the MCU microcontroller MM32SPIN0230B3TV is used to achieve a closed-loop connection based on the H-bridge Buck-Boost buck and boost circuit and the piezoelectric ceramic atomizer drive circuit to adjust the Buck-Boost buck and boost and synchronously detect the output voltage of the piezoelectric ceramic atomizer drive circuit, so as to achieve the purpose of synchronously adjusting the output drive voltage of the piezoelectric ceramic atomizer drive circuit to realize the purpose of bidirectional synchronous control of the Buck-Boost buck-boost process and the output drive voltage of the ceramic atomizer drive circuit, and then synchronously control the DC fan to synchronously blow the atomized board washing water to the solder joints of the components on the surface of the PCBA, avoiding the waste of atomized board washing water, thereby achieving the resynchronization of the MCU microcontroller to respond in time to control the DC motor drive circuit to drive the DC motor to drive the anti-static brush to scrub the flux substances and contaminants remaining on the solder joints on the surface of the PCBA, so as to achieve the best cleaning effect of the PCBA.

[0086] In some embodiments disclosed in this application, the structural diagram of the lithium battery charging and power supply circuit 200 is shown in the attached Figure 5 A 3.7V lithium battery power supply and charging circuit is used. The pin VBAT of the lithium battery charging and power supply circuit 200 is connected to the first pin VBAT of the SW1 key slide switch of the key function input circuit. The SW1 key slide switch of the key function input circuit slides to the second pin VBAT_VDD to power a handheld PCBA cleaning solution.

[0087] The lithium battery charging and power supply circuit includes: a lithium battery interface wire H1, a charging interface USB Type CU2, a lithium battery charging management chip U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first capacitor C1, a second capacitor C2 and a third capacitor C3, and a first NMOS transistor Q1.

[0088] The lithium battery interface wire H1 is connected to the lithium battery and is plugged into the lithium battery.

[0089] The first charging protocol identification terminal CC1 of the charging interface USB TypeC is connected to the first resistor, and the second charging protocol identification terminal CC2 of the charging interface USB TypeC is connected to the second resistor; the first communication terminal DN2 of the charging interface USB TypeC is connected to the third resistor, and the second communication terminal DP1 of the charging interface USB TypeC is connected to the fourth resistor.

[0090] Among them, the charging interface USB TypeC U2 can be a USB TypeC charging interface USB TypeC, or it can be other types of charging interfaces USB TypeC, and no specific restrictions are made here.

[0091] The input end of the lithium battery charging management chip U3 is connected to the first capacitor C1, to the second capacitor C2 and the fifth resistor R5 connected in series, and to the sixth resistor R6 and the seventh resistor R7 connected in parallel, connected to the access charging detection terminal USB_IN of the main control circuit 100; the setting terminal ISET of the lithium battery charging management chip U3 is connected to the eighth resistor; the control terminal EN of the lithium battery charging management chip is connected to the drain of the first NMOS tube Q1, and the gate of the first NMOS tube Q1 is connected to the battery charging enable control terminal CHARGE_EN of the main control circuit 100 through the ninth resistor R9. The gate of the first NMOS tube Q1 is also connected to the first end of the tenth resistor R10, and the source of the first NMOS tube Q1 is connected to the battery terminal CHARGE_STATE of the lithium battery charging management chip U3 through the third capacitor C3. The source of the first NMOS tube Q1 is also connected to the second end of the tenth resistor R10.

[0092] Specifically, the input terminal of the lithium battery charging management chip U3 of the lithium battery charging circuit is input via a USB Type-C input interface. A high level is output via pin PB8 of the MCU microcontroller to control the lithium battery charging management chip U3 to enable charging of the lithium battery. Pin PB8 of the MCU microcontroller is connected to the gate drive terminal of the first NMOS transistor Q1 of the lithium battery charging circuit via the network labeled CHARGE_EN. The ninth resistor R9 outputs a high level to enable the lithium battery charging circuit 200. Pin 7 of the lithium battery charging management chip U3 is connected to pin PA15 of the MCU microcontroller via the network labeled CHARGE_STATE. When the MCU microcontroller reads a high level, the battery is fully charged. When it reads a low level, the battery continues to be enabled for charging.

[0093] Among them, the first resistor R1 and the second resistor R2 are used for TypeC interface PD charging protocol identification, the third resistor R3 and the fourth resistor R4 act as TypeC communication buffers, the fifth resistor R5 and the second capacitor C2 are used for lithium battery charging input matching of the lithium battery charging management chip U3, the sixth resistor R6 and the seventh resistor R7 are used by the MCU microcontroller to detect TypeC access charging, the eighth resistor R8 is used to set the lithium battery charging current, and the ninth resistor R9 and the tenth resistor R10 are NMOS tube gate drive resistors to limit current and divide the voltage to turn on the NMOS tube.

[0094] In some embodiments disclosed in this application, the structural diagram of the buck-boost DC conversion circuit 300 is shown in FIG. Figure 6 The buck-boost DC converter circuit 300 includes: a first inductor L1, a second NMOS transistor Q2, a third NMOS transistor Q3, a fourth NMOS transistor Q4, and a fifth NMOS transistor Q5; a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7; an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14.

[0095] The source of the second NMOS transistor is connected to the first inductor and the drain of the third NMOS transistor, the drain of the second NMOS transistor is connected to the fourth capacitor and the fifth capacitor in parallel, and the gate of the second NMOS transistor is connected to the voltage enable terminal of the main control circuit through the eleventh resistor.

[0096] The drain of the third NMOS transistor is connected to the first inductor and the source of the third NMOS transistor, the source of the third NMOS transistor is connected to the fourth capacitor and the fifth capacitor in parallel, and the gate of the third NMOS transistor is connected to the voltage enable terminal of the main control circuit through the twelfth resistor.

[0097] The source of the fourth NMOS transistor is connected to the first inductor and the drain of the fifth NMOS transistor, the drain of the fourth NMOS transistor is connected to the sixth capacitor and the seventh capacitor in parallel, and the gate of the fourth NMOS transistor is connected to the voltage enable terminal of the main control circuit through the thirteenth resistor.

[0098] The drain of the fifth NMOS transistor is connected to the first inductor and the source of the fourth NMOS transistor, the source of the fifth NMOS transistor is connected to the sixth capacitor and the seventh capacitor in parallel, and the gate of the fifth NMOS transistor is connected to the PWM signal end output by the main control circuit through the fourteenth resistor.

[0099] In some embodiments, the buck-boost DC converter circuit 300 is a Buck-Boost circuit that is controlled by an MCU microcontroller to boost the VBAT 3.7V lithium battery power supply to 12V to power the ceramic atomizer, operating in the Boost function.

[0100] The working process during boosting includes:

[0101] Pin PB3 of the MCU microcontroller is connected to the gate R11 of the second NMOS tube Q2 through the network label CTRL_LEFT_HIG, and the high level controls Q2 to be normally open. Pin PB4 of the MCU microcontroller is connected to the gate R12 of the third NMOS tube Q3 through the network label CTRL_LEFT_LOW, and the low level controls the third NMOS tube Q3 to be normally closed. Pin PB5 of the MCU microcontroller is connected to the gate of Q4 through the network label CTRL_RIGHT_HIG, and the high level turns on the thirteenth resistor R13 to control the boost output to power the ceramic atomizer. Pin PB6 of the MCU microcontroller is connected to the gate of the fifth NMOS tube Q5 through the network label CTRL_RIGHT_LOW, and the high level turns on the fourteenth resistor R14, and the low level turns off. The PWM waveform of a specific frequency and pulse width is alternately output through pin PB6 to control the Boost boost circuit to output 12V to power the piezoelectric ceramic atomizer.

[0102] Set the PWM specific frequency to 100KHz, the duty cycle voltage of the alternating output of pin PB6 is: Uduty_ctrl_right_low / 100, and the output of port Vout is 12V, then:

[0103] U 2 out=U 2 adc_vco x Uduty_ctrl_right_low / 100;

[0104] From this formula, we can see that pin PB6 can be controlled to alternately output a PWM waveform with a specific frequency of 100KHz and a pulse width of Uduty_ctrl_right_low, which is used to control the Boost circuit to work at 12V and power the piezoelectric ceramic atomizer.

[0105] Uduty_ctrl_right_low=V 2 out / (U 2 adc_vco / 100).

[0106] The capacitor in this circuit plays the role of filtering, storing and stabilizing the power supply voltage. The resistor in this circuit plays the role of current limiting and buffering the NMOS switching process. The first inductor L1 is a power inductor that plays the role of energy storage and voltage boosting.

[0107] In some embodiments disclosed in this application, the structural diagram of the atomizer control circuit 400 is shown in the attached Figure 7 ,include:

[0108] Atomizer drive circuit 401, comprising: a sixth NMOS transistor Q6, a first diode D1, a ceramic atomizer VCO, a sixteenth resistor R16, and a seventeenth resistor R17;

[0109] The gate of the sixth NMOS transistor Q6 is connected to the PWM control end of the main control circuit 100 through the first diode D1 and the sixteenth resistor R16 connected in parallel. The gate of the sixth NMOS transistor Q6 is also connected to the first end of the seventeenth resistor R17. The drain of the sixth NMOS transistor Q6 is connected to the ceramic atomizer plate VCO. The source of the sixth NMOS transistor Q6 is connected to the second end of the seventeenth resistor R17.

[0110] The piezoelectric ceramic atomizer driving circuit and the ADC sampling piezoelectric ceramic atomizer voltage are used as a power control circuit to control the atomization power of the ceramic atomizer.

[0111] In this embodiment, the sixteenth resistor R16 is used to limit current. The sixteenth resistor R16 and the seventeenth resistor R17 constitute an NMOS gate drive circuit to provide a drive voltage for the NMOS transistor. The first diode D1 is used to quickly turn off the NMOS transistor.

[0112] In some embodiments disclosed in this application, the structural diagram of the atomizer control circuit 400 is shown in the attached Figure 8 , also includes:

[0113] The atomizer power control circuit 402 includes a seventh NMOS transistor Q7, an eighth PMOS transistor Q8, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, and an eighth capacitor C8.

[0114] The gate of the seventh NMOS transistor Q7 is connected to the ceramic atomizer enable terminal CHECK_VCO_EN of the main control circuit 100 through the eighteenth resistor R18. The source of the seventh NMOS transistor Q7 is grounded. The drain of the seventh NMOS transistor Q7 is connected to the gate of the eighth PMOS transistor Q8. The nineteenth resistor R19 is connected in parallel between the gate of the seventh NMOS transistor Q7 and the source of the seventh NMOS transistor Q7.

[0115] The source of the eighth PMOS transistor Q8 is connected to the voltage output terminal of the atomizer plate driving circuit. The drain of the eighth PMOS transistor Q8 is connected to the working voltage input terminal ADC_VCO_P of the sampling ceramic atomizer plate of the main control circuit 100 through the twenty-first resistor R21. The twenty-second resistor R22 and the eighth capacitor C8 are connected in parallel between the twenty-first resistor R21 and the working voltage input terminal ADC_VCO_P of the sampling ceramic atomizer plate of the main control circuit 100.

[0116] Among them, the PA7 pin of the MCU microcontroller is connected to the gate of the seventh NMOS transistor Q7 through the network label CHECK_VCO_EN, and outputs a high level through the eighteenth resistor R18 to enable the eighth PMOS transistor Q8 to be turned on. After the voltage is divided by the twenty-first resistor R21 and the twenty-second resistor R22, it is connected to the PA6 pin of the MCU microcontroller through the network label ADC_VCO_P to input the working voltage of the piezoelectric ceramic atomizer to the ADC of the MCU microcontroller.

[0117] In this circuit, the operating power of the piezoelectric ceramic atomizer is controlled by the PWM signal PWM_VCO output by the main control. The duty cycle of PWM_VCO can be derived by the formula. Assume that the PWM_VCO duty cycle voltage pulse width is Upwm_vco, the ADC_VCO voltage is Uadc_vco, and the target voltage for Q6 to turn on is Ut (the target voltage Ut is set to 12V or 10V). Then:

[0118] U 2 t=U 2 adc_vco x(Upwm_vco / 100);

[0119] From the above formula we can get:

[0120] U 2 tx 100=U 2 adc_vco x Upwm_vco;

[0121] U 2 t=(U 2 adc_vco / 100)x Upwm_vco;

[0122] That is, the Upwm_vco duty cycle pulse width voltage is: Upwm_vco=U 2 t / (U 2 adc_vco / 100);

[0123] And because the power calculation formula of the piezoelectric ceramic atomizer is P=1 / 2x C x U 2 xf; where P is the power of the piezoelectric ceramic atomizer, in watts; C is the capacitance of the piezoelectric ceramic atomizer, in farads, which can be obtained from the specifications of the piezoelectric ceramic atomizer; U is the operating voltage of the piezoelectric ceramic atomizer; f is the operating frequency of the piezoelectric ceramic. 2 Substituting t into the formula, we can get the power of the piezoelectric ceramic atomizer as P = 1 / 2 x C x U 2 txf.

[0124] In some embodiments disclosed in this application, the structural diagram of the lithium battery power detection circuit is shown in the attached Figure 9The lithium battery circuit detection circuit includes a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a ninth NMOS transistor Q9, a tenth NMOS transistor Q10, and a tenth capacitor C10;

[0125] The gate of the ninth NMOS transistor Q9 is connected to the battery charging enable control terminal CHECK_VBAT_EN of the main control circuit 100 via the twenty-third resistor R23. The drain of the ninth NMOS transistor Q9 is connected to the gate of the tenth NMOS transistor Q10. The source of the ninth NMOS transistor Q9 is grounded. The twenty-fourth resistor R24 ​​is connected to the gate of the ninth NMOS transistor Q9 and the source of the ninth NMOS transistor Q9.

[0126] The source of the tenth NMOS transistor Q9 is connected to the voltage output terminal of the lithium battery charging and power supply circuit 200, and the drain of the tenth NMOS transistor Q10 is connected to the battery voltage terminal VBAT of the sampling ceramic atomizer of the main control circuit 100 through the twenty-sixth resistor R26.

[0127] The twenty-third and twenty-fourth resistors R23 and R24 form a bias voltage for the ninth NMOS transistor Q9 to start the NMOS transistor. The twenty-fifth resistor R25 provides a bias voltage for the tenth NMOS transistor Q10, keeping it in the off state. The twenty-sixth and twenty-seventh resistors R26 and R27 form a resistor divider to provide a sampling voltage for the MCU. The tenth capacitor C10 provides filtering.

[0128] In this embodiment, the PA8 pin of the MCU microcontroller is connected to the gate of the ninth NMOS transistor Q9 through the network label CHECK_VBAT_EN. The twenty-third resistor R23 outputs a high level to enable the PMOS Q10 to turn on. The lithium battery voltage network label VBAT is divided by the twenty-sixth resistor R26 and the twenty-seventh resistor R27 and connected to the PA9 pin of the MCU microcontroller through the network label ADC_VBAT to be input to the ADC for acquisition, input detection and conversion of battery power.

[0129] In some embodiments disclosed in this application, the structural diagram of the low battery alarm circuit is shown in the attached Figure 10 ,

[0130] The low battery alarm circuit includes a twenty-eighth resistor R28 and a first light-emitting diode LED1, one end of the twenty-eighth resistor R28 is connected to the power supply end of the lithium battery charging and power supply circuit 100, and the other end of the twenty-eighth resistor R28 is connected to the first light-emitting diode LED1 to the battery power alarm end of the main control circuit 100.

[0131] When the battery level is detected to be lower than 3.3 V, the first light emitting diode LED1 flashes cyclically every second to indicate a low battery alarm. The twenty-eighth resistor R28 provides current limiting for the first light emitting diode LED1.

[0132] In some embodiments disclosed in this application, the structural diagram of the DC fan drive circuit is shown in the attached Figure 11 The DC fan drive circuit is connected to the first PWM drive output terminal MOTOR_PW1 of the main control circuit and the voltage output terminal of the lithium battery charging and power supply circuit 200, and is controlled by the fan drive signal output by the first PWM drive output terminal MOTOR_PW1 of the main control circuit 100 to drive the DC fan to work.

[0133] Among them, the PA1 pin of the MCU microcontroller is connected to the gate of the eleventh NMOS tube Q11 through the network label MOTOR_PW1, and the thirtieth resistor R30 controls the output of PWM with a certain frequency and duty cycle to control the eleventh NMOS tube Q11 to drive the DC fan synchronously with the piezoelectric ceramic atomizer to achieve atomization.

[0134] The 30th resistor R30 and the 31st resistor R31 provide a bias voltage for switching operation to the gate of the 11th NMOS transistor Q11. The third diode D3 is a freewheeling diode that protects the 11th NMOS transistor Q11.

[0135] In some embodiments disclosed in this application, the structural diagram of the sweeping motor driving circuit is shown in the attached Figure 12 The sweeping motor drive circuit is connected to the second PWM drive output terminal MOTOR_PWM2 of the main control circuit 100 and the voltage output terminal of the lithium battery charging and power supply circuit 200, and is controlled by the fan drive signal output by the second PWM drive output terminal MOTOR_PWM2 of the main control circuit 100 to drive the sweeping motor to work.

[0136] Specifically, the PA2 pin of the MCU microcontroller is connected to the gate of the twelfth NMOS transistor Q12 through the network label MOTOR_PWM2, and the thirty-second resistor R32 controls the PWM output of a certain frequency and duty cycle to control the twelfth NMOS transistor Q12 to drive the DC sweeping motor synchronous DC motor drive circuit. The driving motor drives the anti-static brush to sweep the PCBA to clean the flux residue and contaminants on the surface of the PCBA.

[0137] The 32nd resistor R32 and the 33rd resistor R33 provide a bias voltage for switching operation to the gate of the twelfth NMOS transistor Q12. The third diode D3 and the fourth diode D4 are freewheeling diodes, which play a role in protecting the twelfth NMOS transistor Q12.

[0138] In some embodiments disclosed in this application, the structural diagram of the DC motor drive circuit is shown in the attached Figure 13 The DC motor drive circuit is connected to the third PWM drive output terminal MOTOR_PWM3 of the main control circuit 100 and the voltage output terminal of the lithium battery charging and power supply circuit 200, and is controlled by the fan drive signal output by the third PWM drive output terminal MOTOR_PWM3 of the main control circuit 100 to drive the DC motor to work.

[0139] The seventeenth capacitor C17 and the sixteenth capacitor C16 perform filtering and storage voltage stabilization functions, the fifth diode D5 and the fourteenth capacitor C14 perform voltage bootstrapping functions, and the same applies to the sixth diode D6 and the fifteenth capacitor C15. The thirty-seventh resistor R37 and the thirty-eighth resistor R38 limit current and provide buffering for the gate drive of the thirteenth and fourteenth NMOS transistors Q13 and Q14, and the thirty-ninth resistor R39 and the fortieth resistor R40 limit current and provide buffering for the gate drive of the fifteenth and sixteenth NMOS transistors Q15 and Q16.

[0140] The seventh diode D7, the eighth diode D8, the ninth diode D9 and the twelfth diode D10 are freewheeling diodes, which discharge the reverse electromotive force generated by the discharger U10 and protect the thirteenth NMOS transistor Q13, the fourteenth NMOS transistor Q14, the fifteenth NMOS transistor Q15 and the sixteenth NMOS transistor Q16.

[0141] The eighteenth capacitor C18 provides filtering and voltage stabilization for the input power supply VBAT_VDD, and the thirty-sixth resistor R36 regulates the current.

[0142] The thirty-fourth resistor R34 and the thirty-fifth resistor R35 form a resistor voltage divider, which serves to sample and feed back the voltage to the driver chip U5.

[0143] The second diode D2 is a rectifier diode, the second inductor L2 is a power inductor that performs a voltage boosting function, and the nineteenth capacitor C19 is a load filter capacitor that performs a filtering and voltage stabilization function.

[0144] Specifically, the PA3 pin of the MCU microcontroller is connected to the 2nd pin IN of the pre-driver chip U6 through the network label MOTOR_PWM3. The MCU microcontroller controls PA3 to output a PWM with a certain frequency and duty cycle to drive the 7th pin HO and the 5th pin LO of the pre-driver chip U6 to output signals to drive the half-bridge circuit composed of the 13th NMOS tube Q13 and the 14th NMOS tube Q14 to control the upper and lower bridges to drive the DC motor to work.

[0145] Pin PA4 of the MCU microcontroller is connected to pin 2 (IN) of pre-driver chip U7 via the network label MOTOR_PWM4. The MCU microcontroller controls PA4 to output PWM signals with the same frequency and duty cycle as PA3, driving the pre-driver chip U7's pins 7 (HO) and 5 (LO). This output signals drive the half-bridge circuit composed of the fourteenth NMOS transistor Q14 and the fifteenth NMOS transistor Q15, controlling the upper and lower bridges of the DC motor. Pins PA3 and PA4 of the MCU microcontroller alternately output PWM signals with the same frequency and adjustable duty cycle, driving pre-driver chips U6 and U7 to drive the H-bridge circuit composed of the thirteenth NMOS transistor Q13, the fourteenth NMOS transistor Q14, and the fifteenth NMOS transistor Q15 and the sixteenth NMOS transistor Q16, controlling the forward and reverse rotation of the DC motor, thereby driving the anti-static brush to clean residual flux and contaminants from the PCBA surface.

[0146] The MCU microcontroller detects the output power of the piezoelectric ceramic atomizer and the synchronous fan to synchronously adjust the specific PWM duty cycle of PA3 and PA4, control the power of the DC motor to drive the anti-static brush to scrub the PCBA, and synchronize the sweeping power of the sweeping motor to achieve a specific power and sweeping force for scrubbing the PCBA, so as to achieve a more ideal cleaning effect and remove residual flux and contaminants on the PCBA surface.

[0147] The working process in the PCBA electric washer is as follows: the SW1 key sliding switch of the key function input circuit 700 slides to the 1-2 pin, the lithium battery voltage VBAT is turned on, and is connected to the 5th pin VIN pin of the driver chip U5 through the network label VBAT_VDD, boosting the 3.7V lithium battery to 10-12V, and the second diode D2 outputs 10-12V through the network label VBAT_VCC and is connected to the 1st pin of the pre-driver chip U6 and the pre-driver chip U7 respectively to provide power, providing pre-drive working conditions for driving the H-bridge DC motor drive circuit composed of the thirteenth NMOS tube Q13, the fourteenth NMOS tube Q14, the fifteenth NMOS tube Q15, and the sixteenth NMOS tube Q16.

[0148] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments. In addition, the above embodiments can be freely combined as needed.

Claims

1. A PCBA cleaning control circuit, characterized in that: include: A main control circuit configured to control the PCBA cleaning control circuit; A lithium battery charging and power supply circuit, controlled by a high-level enable signal output by the main control circuit, supplies power to the PCBA cleaning control circuit; The voltage input terminal of the buck-boost DC converter circuit is connected to the voltage output terminal of the lithium battery charging and power supply circuit. The voltage control terminal of the buck-boost DC converter circuit is connected to the voltage enable terminal of the main control circuit. The buck-boost DC converter circuit is controlled by the PWM signal output by the main control circuit to boost the voltage output of the lithium battery charging and power supply circuit to a preset operating voltage to power the atomizer control circuit. The atomizing plate control circuit is connected to the main control circuit and the buck-boost DC conversion circuit, and is controlled by the PWM atomizing signal output by the main control circuit to atomize the cleaning liquid for cleaning the PCBA at the preset working voltage; The cleaning drive circuit is controlled by the PWM cleaning signal output by the main control circuit, blows the atomized cleaning liquid onto the PCBA to be cleaned and cleans the PCBA to be cleaned.

2. The PCBA cleaning control circuit according to claim 1, characterized in that: The lithium battery charging and power supply circuit includes: a lithium battery interface wire, a USB Type C charging interface, a lithium battery charging management chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a third capacitor, and a first NMOS transistor; The lithium battery interface wire is connected to the lithium battery; The first charging protocol identification end of the USB Type-C charging interface is connected to the first resistor, and the second charging protocol identification end of the USB Type-C charging interface is connected to the second resistor; the first communication end of the USB Type-C charging interface is connected to the third resistor, and the second communication end of the USB Type-C charging interface is connected to the fourth resistor; The input end of the lithium battery charging management chip is connected to the first capacitor, to the second capacitor and the fifth resistor in series, and to the sixth resistor and the seventh resistor in parallel, which are connected to the access charging detection end of the main control circuit; the setting end of the lithium battery charging management chip is connected to the eighth resistor; the control end of the lithium battery charging management chip is connected to the drain of the first NMOS tube, the gate of the first NMOS tube is connected to the battery charging enable control end of the main control circuit through the ninth resistor, the gate of the first NMOS tube is also connected to the first end of the tenth resistor, the source of the first NMOS tube is connected to the battery end of the lithium battery charging management chip through the third capacitor, and the source of the first NMOS tube is also connected to the second end of the tenth resistor.

3. The PCBA cleaning control circuit according to claim 1, characterized in that: The buck-boost DC conversion circuit includes: a first inductor, a second NMOS transistor, a third NMOS transistor, a fourth NMOS transistor, and a fifth NMOS transistor; a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor; an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor; The source of the second NMOS transistor is connected to the first inductor and the drain of the third NMOS transistor, the drain of the second NMOS transistor is connected to the fourth capacitor and the fifth capacitor connected in parallel, and the gate of the second NMOS transistor is connected to the voltage enable terminal of the main control circuit through the eleventh resistor; The drain of the third NMOS transistor is connected to the first inductor and the source of the third NMOS transistor, the source of the third NMOS transistor is connected to the fourth capacitor and the fifth capacitor connected in parallel, and the gate of the third NMOS transistor is connected to the voltage enable terminal of the main control circuit through the twelfth resistor; The source of the fourth NMOS transistor is connected to the first inductor and the drain of the fifth NMOS transistor, the drain of the fourth NMOS transistor is connected to the sixth capacitor and the seventh capacitor connected in parallel, and the gate of the fourth NMOS transistor is connected to the voltage enable terminal of the main control circuit through the thirteenth resistor; The drain of the fifth NMOS transistor is connected to the first inductor and the source of the fourth NMOS transistor, the source of the fifth NMOS transistor is connected to the sixth capacitor and the seventh capacitor in parallel, and the gate of the fifth NMOS transistor is connected to the PWM signal end output by the main control circuit through the fourteenth resistor.

4. The PCBA cleaning control circuit according to claim 1, characterized in that: The atomizer control circuit includes: An atomizer drive circuit, comprising: a sixth NMOS transistor, a first diode, a ceramic atomizer, a sixteenth resistor, and a seventeenth resistor; The gate of the sixth NMOS tube is connected to the PWM control end of the main control circuit through the first diode and the sixteenth resistor in parallel. The gate of the sixth NMOS tube is also connected to the first end of the seventeenth resistor. The drain of the sixth NMOS tube is connected to the ceramic atomizer plate. The source of the sixth NMOS tube is connected to the second end of the seventeenth resistor.

5. The PCBA cleaning control circuit according to claim 4, characterized in that: The atomizer control circuit further includes: an atomizer power control circuit, the atomizer power control circuit comprising a seventh NMOS transistor, an eighth PMOS transistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, and an eighth capacitor; The gate of the seventh NMOS transistor is connected to the ceramic atomizer enable terminal of the main control circuit through the eighteenth resistor, the source of the seventh NMOS transistor is grounded, the drain of the seventh NMOS transistor is connected to the gate of the eighth PMOS transistor, and the nineteenth resistor is connected in parallel between the gate of the seventh NMOS transistor and the source of the seventh NMOS transistor; The source of the eighth PMOS tube is connected to the voltage output end of the atomizer plate driving circuit, the drain of the eighth PMOS tube is connected to the working voltage input end of the sampling ceramic atomizer plate of the main control circuit through the twenty-first resistor, and the twenty-second resistor and the eighth capacitor are connected in parallel between the twenty-first resistor and the working voltage input end of the sampling ceramic atomizer plate of the main control circuit.

6. The PCBA cleaning control circuit according to claim 1, characterized in that: Also includes: A lithium battery power detection circuit, wherein the lithium battery power detection circuit includes a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a ninth NMOS transistor, a tenth NMOS transistor, and a tenth capacitor; The gate of the ninth NMOS transistor is connected to the lithium battery power detection enable terminal of the main control circuit via the twenty-third resistor, the drain of the ninth NMOS transistor is connected to the gate of the tenth NMOS transistor, the source of the ninth NMOS transistor is grounded, and the twenty-fourth resistor is connected to the gate of the ninth NMOS transistor and the source of the ninth NMOS transistor; The source of the tenth NMOS tube is connected to the voltage output end of the lithium battery charging and power supply circuit, and the drain of the tenth NMOS tube is connected to the battery voltage end of the sampling ceramic atomizer of the main control circuit through the twenty-sixth resistor.

7. The PCBA cleaning control circuit according to claim 6, characterized in that: Also includes: A low battery alarm circuit includes a twenty-eighth resistor and a first light-emitting diode, one end of the twenty-eighth resistor is connected to the power supply end of the lithium battery charging and power supply circuit, and the other end of the twenty-eighth resistor is connected to the first light-emitting diode to the battery power alarm end of the main control circuit.

8. The PCBA cleaning control circuit according to claim 1, characterized in that: The cleaning drive circuit further includes: A DC fan drive circuit is connected to the first PWM drive output terminal of the main control circuit and the voltage output terminal of the lithium battery charging and power supply circuit, and is controlled by the fan drive signal output by the first PWM drive output terminal of the main control circuit to drive the DC fan to work; a sweeping motor drive circuit connected to the second PWM drive output terminal of the main control circuit and the voltage output terminal of the lithium battery charging and power supply circuit, and controlled by the fan drive signal output by the second PWM drive output terminal of the main control circuit to drive the sweeping motor to work; The DC motor drive circuit is connected to the third PWM drive output terminal of the main control circuit and the voltage output terminal of the lithium battery charging and power supply circuit, and is controlled by the fan drive signal output by the third PWM drive output terminal of the main control circuit to drive the DC motor to work.

9. The PCBA cleaning control circuit according to any one of claims 1 to 8, characterized in that: Also includes: The key function input circuit is connected to the main control circuit and the lithium battery charging and power supply circuit, and transmits key pressing and key releasing signals to the main control circuit for detection.

10. A PCBA cleaner, characterized in that: include: The PCBA cleaning control circuit according to any one of claims 1 to 9.

Images