A DC-driven cleaning system

Abstract

This application provides a DC-driven cleaning system, including: a power board, a control board, an image acquisition unit, a drive unit, and cleaning components; the power board, control board, and image acquisition unit are electrically connected; the control board is equipped with an H-bridge motor drive chip, which is electrically connected to and controls the drive unit; the power board receives digital switch output signals related to image acquisition from the image acquisition unit, thereby controlling the power supply to the H-bridge motor drive chip, and thus controlling the start or stop of the drive unit; the drive unit is connected to and drives the cleaning components to perform rotation and cleaning operations. This application uses a motor-driven air brush to clean the cabinet glass, thereby achieving automatic dust removal, realizing timed cleaning of the cabinet glass in front of the camera, reducing reliance on manual cleaning, and ensuring that the camera can clearly capture road traffic conditions, improving the accuracy and quality of captured images.

Description

Technical Field

[0001] This application relates to the field of automatic control technology, and in particular to a DC-driven cleaning system. Background Technology

[0002] In intelligent transportation projects, video surveillance cameras require careful consideration of dust removal and heat dissipation; otherwise, prolonged operation can negatively impact image quality. This design addresses this issue by periodically cleaning the glass cabinet within the camera unit. In the field of surveillance cameras, the front glass of the cabinet is constantly exposed to the outdoor environment, easily accumulating dust. This severely affects the camera's accuracy in capturing road traffic conditions. Currently, mainstream solutions rely on regular manual cleaning, a process that is not only time-consuming and labor-intensive but can also negatively impact monitoring effectiveness if cleaning is not done promptly.

[0003] Therefore, there is an urgent need in this field for a time-saving and labor-saving technical solution that can automatically remove dust from glass at regular intervals without relying on manual cleaning. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a DC-driven cleaning system to solve the technical problem that the cleaning of existing video surveillance cameras relies on manual labor, which is time-consuming and labor-intensive.

[0005] To achieve the above and other related objectives, a first aspect of this application provides a DC-driven cleaning system, comprising: a power board, a control board, an image acquisition unit, a drive unit, and a cleaning component; the power board, control board, and image acquisition unit are electrically connected; the control board is provided with an H-bridge motor drive chip, which is electrically connected to and controls the drive unit; the power board receives digital output signals related to image acquisition from the image acquisition unit, thereby controlling the power supply to the H-bridge motor drive chip, and thus controlling the start or stop of the drive unit; the drive unit is connected to and drives the cleaning component to perform rotation and cleaning operations.

[0006] In some embodiments of the first aspect of this application, the drive unit includes a DC air brush motor and a DC air pump motor, and the cleaning component includes an air brush device; the DC air brush motor is connected to and drives the air brush device to rotate clockwise or counterclockwise within the range of the cleaning target, and the DC air pump motor is used to increase the inflation pressure of the air pump, which is connected to the air brush nozzle through a pipe, and the increased inflation pressure of the air pump is released from the air brush nozzle and blown toward the cleaning target.

[0007] In some embodiments of the first aspect of this application, the air brush device generates a corresponding operating status signal when it is in operation; the control board receives and detects the operating status signal of the air brush device, processes it into a signal format suitable for the image acquisition unit, and feeds back the DC air brush status signal to the image acquisition unit through the power board.

[0008] In some embodiments of the first aspect of this application, after receiving the working status signal of the air brush device, the image acquisition unit sends it to the server so that the user can monitor the working status of the air brush device in real time.

[0009] In some embodiments of the first aspect of this application, the power board provides a DC12V voltage and a DC3.3V voltage to the control board; the control board is also provided with a logic chip and a photoelectric sensor chip; the DC12V voltage powers the H-bridge motor drive chip on the control board, and the DC3.3V voltage powers the logic chip and the photoelectric sensor chip, and is provided to the H-bridge motor drive chip in the form of series resistor voltage division, as a reference voltage for the DC brush motor and the DC air pump motor.

[0010] With this design, the reference voltage Vref for the DC brush motor and DC air pump motor, when used for the Isen pin of the H-bridge motor driver chip, determines the speed of the DC brush motor and the amount of air pumped into the nozzle, which in turn determines the cleaning capability of the brush nozzle.

[0011] In some embodiments of the first aspect of this application, the power supply board includes: a power protection circuit, a step-down circuit, a logic inverting circuit, and an output control circuit; the power protection circuit is provided with overcurrent protection and short-circuit protection; the step-down circuit converts DC12V voltage to DC3.3V, and the voltage fluctuation is within 50mV; the logic inverting circuit is used to feed back the DC brush status signal to the camera; the output control circuit is used to control whether the DC12V voltage is output; the input signals of the power supply board include: DC12V positive and negative voltage signals from the system, digital switch output signals from the camera, and DC brush status signals from the control board; the output signals of the power supply board include: DC12V voltage signals output to the control board, DC3.3V voltage signals, and DC brush status signals output to the camera.

[0012] In some embodiments of the first aspect of this application, the output control circuit includes: one end of the ferrite bead LB3 is connected to the DO signal of the camera, and the other end is connected to one end of the resistor R10. The other end of the resistor R10 is connected to the base of the NPN transistor Q1. The emitter of the NPN transistor Q1 is grounded. The collector is connected to the gate of the high-power PMOS chip U3 through the connecting resistor R11. After the source and drain of the high-power PMOS chip U3 are turned on, it outputs a DC12V voltage signal. The DO signal ALARM_OUT_REF of the camera is connected to DC3.3V through the ferrite bead LB2.

[0013] In some embodiments of the first aspect of this application, the NPN transistor Q1 controls the gate voltage of the high-power PMOS chip U3. When the camera sends a DC12V output enable signal, DO+ and DO- are shorted, the NPN transistor Q1 is turned on, the voltage difference between the gate and source of the PMOS chip reaches the turn-on voltage Vgsth, the high-power PMOS chip U3 is turned on, and the DC12V voltage is output. When the camera sends a DC12V output disable enable signal, DO+ and DO- are disconnected, the NPN transistor Q1 is turned off, the voltage difference between the gate and source of the PMOS chip cannot reach the turn-on voltage Vgsth, the high-power PMOS chip U3 is not turned on, and there is no DC12V voltage output.

[0014] In some embodiments of the first aspect of this application, the power board is further provided with a first indicator light and a second indicator light; the first indicator light represents the output state of DC12V voltage by the light being on or off; the second indicator light represents the output state of DC3.3V voltage by the light being on or off.

[0015] In some embodiments of the first aspect of this application, there is an H-bridge motor driver chip U1, photoelectric sensors U2-U3, logic inverters U4-U8, and logic AND gate chips U9-U10; the output terminals of photoelectric sensors U2 and U3 are connected to the input terminals of the inverter U4, the output terminal of the inverter U4 is connected to the input terminal of the inverter U5, the output terminal of the inverter U5 is connected to the input terminals of logic AND gate chips U9A and U9B, the output terminals of logic AND gate chips U9A and U9B are connected to the input terminals of the logic inverter U6, the output terminal of the logic inverter U6 is connected to the input terminals of logic AND gate chips U10A and U10B, and the output terminals of logic AND gate chips U10A and U10B are connected to the input terminals of the logic inverter U7.

[0016] As described above, the DC-driven cleaning system of this application has the following beneficial effects: This application uses a motor to drive an air brush to clean the cabinet glass, thereby achieving the function of automatic dust removal, realizing timed cleaning of the cabinet glass in front of the camera, reducing the reliance on manual cleaning, and ensuring that the camera can clearly capture the road traffic conditions, thus improving the accuracy and quality of the captured images. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic representation of a DC-driven cleaning system according to an embodiment of this application.

[0018] Figure 2 The diagram shown is a physical example of a DC-driven cleaning system according to one embodiment of this application.

[0019] Figure 3 The diagram shown is a schematic diagram of the circuit structure of the power board in one embodiment of this application.

[0020] Figure 4A The diagram shown is a schematic representation of a power protection circuit in one embodiment of this application.

[0021] Figure 4B The diagram shown is a partial circuit structure schematic of a step-down circuit in one embodiment of this application.

[0022] Figure 4C The diagram shown is a partial circuit structure schematic of a step-down circuit in one embodiment of this application.

[0023] Figure 4D The diagram shown is a schematic diagram of the circuit structure of a logic inverting circuit in one embodiment of this application.

[0024] Figure 4E The diagram shown is a schematic diagram of the output control circuit in one embodiment of this application.

[0025] Figure 4F The diagram shown is a schematic diagram of the circuit structure of an indicator light in one embodiment of this application.

[0026] Figure 5A , 5B Figure 5C shows a partial circuit structure diagram of the H-bridge motor drive chip and its accessory circuit on the control board in one embodiment of this application.

[0027] Figure 6A , 6B 6C shows a partial structural circuit diagram of the control board in one embodiment of this application. Detailed Implementation

[0028] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0029] Before providing a further detailed description of the present invention, the nouns and terms used in the embodiments of the present invention are explained, and the nouns and terms used in the embodiments of the present invention are subject to the following interpretations:

[0030] <1> H-bridge motor driver chip: An integrated circuit used to control the forward, reverse, and stop of a motor. It typically contains four switching elements (such as MOSFETs) arranged in an H-type structure, allowing the motor to rotate forward, reverse, or stop by changing the state of these switches.

[0031] <2> Air brush nozzle: A device that uses compressed air as power to spray paint in a mist form onto the surface of the object to be coated through a nozzle.

[0032] <3> Groove-type photoelectric sensor: A sensor that detects the presence of an object by emitting light and detecting whether the object blocks the light. This type of sensor is commonly used to detect the position, size, or shape of an object and is widely used in automated equipment, robots, assembly lines, etc. Groove-type sensors have high resistance to interference light and can operate stably under various ambient lighting conditions.

[0033] Figure 1 The diagram illustrates the structure of the DC-driven cleaning system provided in this application, which includes: a power supply board, a control board, an image acquisition unit, a drive unit, and cleaning components. The power supply board, control board, and image acquisition unit are electrically connected; an H-bridge motor drive chip is mounted on the power supply board, which is electrically connected to and controls the drive unit; the power supply board receives digital switch output signals related to image acquisition from the image acquisition unit, thereby controlling the power supply to the H-bridge motor drive chip, and thus controlling the start or stop of the drive unit; the drive unit is connected to and drives the cleaning components to perform rotation and cleaning operations.

[0034] Preferably, the drive unit includes a DC air brush motor and a DC air pump motor, and the cleaning component includes an air brush device; the DC air brush motor is connected to and drives the air brush to rotate clockwise or counterclockwise within the range of the cleaning target; the DC air pump motor is used to increase the inflation pressure of the air pump, which is connected to the air brush nozzle through a pipe; the increased inflation pressure from the air pump is released from the air brush nozzle and blown towards the cleaning target. The number of air brush nozzles can be one or more, and a preferred assembly method includes pairs of air brush nozzles arranged in a mirror image on the cleaning target.

[0035] Understandably, a DC air pump motor drives the air pump, which then draws in air from the atmosphere. Inside the pump, a piston or rotor compresses the air, gradually increasing its pressure. As the motor continues to run, the air pump compresses the air to the desired pressure level, for example, from 0 to 300 mmHg (500cc cylinder). The air pump's output is connected to the air brush nozzles via piping. By controlling valves or opening / closing the nozzles, the release pressure and flow rate of the compressed air can be adjusted. When the compressed air is released through the nozzles, the high-pressure airflow blows away dust and other impurities from the glass cabinet, achieving the cleaning purpose. The air pump is the power source for the nozzles, providing the required pressure through compressed air. During the cleaning process, the air pump compresses the air and delivers it to the nozzles. This pressurized air is responsible for blowing away dust from the glass cabinet surface. These nozzles can generate high-speed airflow to clean or coat surfaces. The nozzle design allows the airflow to be ejected in specific shapes and patterns, such as fan-shaped or solid cone-shaped.

[0036] For example, the image acquisition unit can be a camera, and the power board receives the digital switching output signal related to image acquisition from the image acquisition unit, which is the camera's DO signal. It should be understood that in a camera system, the DO signal refers to the Digital Output signal, and in this embodiment, it specifically refers to a digital switching signal. In this embodiment, the DO signal is used to control the power supply of the H-bridge motor driver chip. For example, when DO+ and DO- are shorted, the PMOS is turned on, and the DC12V output is enabled; when DO+ and DO- are disconnected, the PMOS is turned off, and the DC12V output is disabled.

[0037] H-bridge motor driver chips are integrated circuits used for motor control, enabling forward and reverse rotation and speed regulation of motors. An H-bridge consists of four main switching elements, which can be transistors, MOSFETs, or IGBTs, distributed across the four vertical legs of the H-bridge, with the motor connected in the middle. By independently controlling these four switching elements, the H-bridge can change the direction of current flow through the motor, achieving forward and reverse rotation control. Specifically, the H-bridge motor driver chips selected in this embodiment include, for example, L298N, TB6612FNG, and A4950.

[0038] For ease of understanding, Figure 2 Taking the DC-driven cleaning system on display as an example, the cleaning target is the glass of a cabinet. A camera is installed inside the cabinet, and two air brush nozzles are arranged in a mirror image on the cabinet. The camera is turned on at regular intervals, and the air brush nozzles rotate clockwise / counterclockwise within the range of the glass to spray air, thereby achieving the effect of removing dust from the glass and avoiding unclear images from the camera due to dust, which would affect the quality of the camera's shooting.

[0039] Preferably, the air brush generates corresponding operating status signals during operation. These signals indicate the air brush's running status, such as whether it is operating normally or has encountered a fault. The control board detects the DC air brush's operating status signals, processes them into a format suitable for the camera to receive, and then feeds them back to the camera via the power board. The camera uploads the received signals to a server (such as a local server or cloud server). The server is responsible for storing video data and status signals and provides remote access functionality, allowing users to log in through client software or a web interface to view the data. This enables real-time monitoring of the air brush's operating status and allows for timely maintenance or repair when a fault is detected.

[0040] In the embodiments of this application, the power board provides DC12V and DC3.3V voltages to the control board; the control board is also provided with a logic chip and a photoelectric sensor chip; the DC12V voltage powers the H-bridge motor drive chip on the control board, and the DC3.3V voltage powers the logic chip and the photoelectric sensor chip, and is provided to the H-bridge motor drive chip in the form of series resistor voltage division, as a reference voltage for the DC brush motor and the DC air pump motor.

[0041] As the reference voltage Vref for both the DC brush motor and the DC air pump motor, the selection of an appropriate Rsense sampling resistor and a suitable reference voltage Vref for the Isen pin of the H-bridge motor driver chip determines the speed of the DC brush motor and the air volume of the DC air pump-driven nozzle, thus determining the cleaning capability of the brush nozzle. The Isen pin is typically used for current sensing. By connecting a low-value, high-power rated resistor to ground (GND), a current sensing loop can be formed. The motor's operating current flowing through this resistor will generate a voltage drop, which is proportional to the current. Therefore, the current can be detected by monitoring this voltage drop.

[0042] It should be understood that the control board's DC 3.3V is divided into two paths, which are then divided using series resistors and supplied to the A-phase and B-phase reference level input pins of the H-bridge driver chip. Phase A is for the DC air pump motor, and phase B is for the DC brush motor. One end of each of the two current-limiting resistors is shorted to ground, and the other end is connected to the A-phase and B-phase current protection input pins of the H-bridge driver chip, respectively. The chip's reference voltage and the current-limiting resistors together determine the maximum load current of the DC air pump motor and the DC brush motor.

[0043] Furthermore, DC brush motors and DC air pump motors draw more current when starting or stalling, which can cause the power supply voltage to drop and affect the power supply of the entire DC12V system. Therefore, by using a current-limiting resistor to limit the maximum current of the motor, if the current is too large when the motor starts or stalls, exceeding the PWM chopping threshold (maximum current), the output H-bridge will be turned off, so as to achieve the purpose of not exceeding the maximum load current output.

[0044] Preferably, a recessed photoelectric sensor chip can be used for photoelectric conversion. The recessed photoelectric sensor consists of a light source, a photodiode, and a recessed reflector. Its principle is to use photoelectric sensing technology to detect the presence, position, speed, and direction of an object by observing whether the object blocks or reflects light. The recessed photoelectric sensor chip has significant advantages such as high precision, high repeatability, high anti-interference capability, and ease of installation and alignment.

[0045] The above section explained the overall structure and principle of the DC-driven cleaning system. The following section will further explain the power supply board and control board with reference to specific circuit diagrams.

[0046] like Figure 3 The diagram shows a schematic of the power board's circuit structure in an embodiment of the present invention. The power board includes: a power protection circuit, a step-down circuit, a logic inverting circuit, an output control circuit, and indicator lights. The power board's input signals include: positive and negative DC 12V voltage signals from the system (12VDC signal and GND signal), DO signals from the camera (DO+: ALARM_OUT_A signal and DO-: ALARM_OUT_REF signal), and a DC brush status signal (PI_WIP_IN) from the control board. The power board's output signals include: a DC 12V voltage signal (12V_WIP_OUT signal) output to the control board, a DC 3.3V voltage signal (V33_WIP_OUT signal), and a DC brush status signal (PI_CPU_OUT signal) output to the camera.

[0047] Figure 4AThe circuit structure of the power protection circuit is shown, which includes: fuse F1, diode D1, bidirectional transient voltage suppressor diode D2, capacitor C1, capacitor C10, and solid-state capacitor E1. One end of fuse F1 is connected to a DC12V+ voltage signal, and the other end is connected to one end of diode D1 and one end of bidirectional transient voltage suppressor diode D2; the other end of bidirectional transient voltage suppressor diode D2 is grounded; the cathode of diode D1 is connected to one end of capacitor C1, capacitor C10, and solid-state capacitor E1 and then connected to +DC12V; the other ends of capacitor C1, capacitor C10, and solid-state capacitor E1 are connected in parallel and grounded.

[0048] It should be understood that fuse F1 is used for overcurrent protection. If the current in the circuit exceeds the fuse's rated value, the fuse will melt, thus cutting off the circuit and preventing further damage. Diode D1 allows current to flow in one direction, preventing short circuits between the positive and negative terminals of DC 12V. The bidirectional transient suppression diode D2 can operate in both directions, limiting the voltage within a safe range. If the voltage exceeds its rated value, D2 will conduct regardless of whether it is forward or reverse, protecting the circuit from voltage spikes. Capacitors C1 and C2 are used to smooth voltage fluctuations and reduce noise and ripple. Solid-state capacitor E1 typically has a large capacitance value and is used for filtering and energy storage, providing a stable DC 12V voltage.

[0049] Figure 4B and 4C The circuit structure of the buck converter circuit is shown, including the DC-DC buck chip U1 and its associated circuitry, used to convert DC 12V voltage to DC 3.3V voltage with a ripple of less than 50mV. It should be understood that a ripple of less than 50mV refers to the fluctuation or noise level of the power supply output voltage. In a DC power supply, even if the output voltage is ideally constant, there will always be small voltage fluctuations in reality; these fluctuations are ripple. Ripple can be caused by various factors, such as the power supply design itself, load variations, and temperature changes. In this embodiment, a ripple of less than 50mV means that the fluctuation range of the output voltage will not exceed 50mV.

[0050] For example, the DC-DC step-down chip U1 can be selected from models including but not limited to Texas Instruments' LM2675, LM3668, Analog Devices' LT8705, LT8706, LT8640, LT8690, Infineon's TLE9871, TLE9863, TLE4206, NXP's TPS54331, TPS54333, etc., but this application embodiment does not limit it.

[0051] Furthermore, a ferrite bead LB4 is installed at the power output port of the power board, ultimately outputting a DC 3.3V voltage. One end of the ferrite bead LB4 is connected to the DC 3.3V voltage and then connected to one end of a capacitor C26. The other end of capacitor C26 is grounded. The other end of the ferrite bead LB4 is connected to capacitors C7 and C15 in parallel. The other ends of capacitors C7 and C15 are shorted to ground and output the V33_WIP_OUT signal. It should be understood that the function of the ferrite bead is to suppress high-frequency noise and spike current. It is made of ferrite material, which has high resistivity and permeability, giving it excellent impedance characteristics at high frequencies.

[0052] Figure 4D The circuit structure of the logic inverting circuit is shown, including the logic inverting chip U2 and its accessory circuitry, which is used to feed back the DC brush rotation state to the camera after inversion. The logic inverting chip U2 is an integrated circuit that implements the logic inversion function, reversing the state of the input logic signal; that is, a high input (HIGH) outputs a low output (LOW), and a low input outputs a high output. Pin A1 of the logic inverting chip U2 is connected to one end of resistor R15, and the other end of resistor R15 is connected to the DC brush status signal (PI_WIP_IN) from the control board. Pin Y1 of the logic inverting chip U2 is connected to one end of resistor R14, and the other end of resistor R14 outputs an inverted DC brush status signal (PI_CPU_OUT signal) to the camera.

[0053] Explained, if the rotation state of the air brush changes rapidly, jitter may occur in the output signal. The logic inverting circuit can provide a certain degree of jitter reduction, ensuring signal stability. The logic inverting circuit also provides isolation and protection, i.e., it provides electrical isolation to protect the camera's circuitry from electrical interference or overvoltage generated by the air brush drive circuit. Furthermore, there is a mismatch between the camera's input signal level and the output level of the DC air brush drive motor. For example, the air brush drive circuit outputs a low level to indicate that the air brush is rotating, while the camera requires a high level to represent the same state. Therefore, a logic inverting circuit is needed to reverse the signal level to ensure that the signal meaning is correctly expressed. The logic inverting chip in this embodiment can be a 74 series TTL logic chip (such as 74LS04), a 4000 series CMOS logic chip (such as 74HC04), or a high-speed CMOS series chip (such as SN74HC04, CD74HC04, etc.), and this embodiment does not limit this to any particular type.

[0054] Figure 4EThe circuit structure of the output control circuit is shown, which includes a high-power PMOS chip U3 and its accessory circuitry. One end of the ferrite bead LB3 is connected to the camera's DO+ signal (ALARM_OUT_A signal), and the other end is connected to one end of resistor R10. The other end of resistor R10 is connected to the base of NPN transistor Q1. The emitter of NPN transistor Q1 is grounded, and the collector is connected to the gate (G1 and G2 pins) of the high-power PMOS chip U3 through resistor R11. The source (S1 and S2 pins) and drain (D1 and D2 pins) of the high-power PMOS chip U3 are shorted and connected to the 12V_WIP signal. The 12V_WIP signal, after being connected to the ferrite bead LB1, outputs a DC 12V voltage signal (12V_WIP_OUT signal). The main function of the ferrite bead LB1 is to suppress current surges and protect against faults such as short circuits, as explained above and will not be repeated here.

[0055] NPN transistor Q1 acts as a switch, controlling the gate voltage of the high-power PMOS chip U3. When the camera sends a DC12V output enable signal, DO+ (ALARM_OUT_A) and DO- (ALARM_OUT_REF) are shorted, turning on NPN transistor Q1 and providing the appropriate voltage to the gate of the PMOS chip, thus controlling the switching state of the PMOS. More specifically, the high-power PMOS chip U3 controls the output of the DC12V power supply. When NPN transistor Q1 is on, the voltage difference between the gate and source of the PMOS chip reaches the turn-on voltage Vgsth, the PMOS is on, and a 12V_WIP signal is output. Conversely, if NPN transistor Q1 is not on, the voltage difference between the gate and source of the PMOS chip cannot reach the turn-on voltage Vgsth, the PMOS is off, the high-power PMOS chip U3 is not on, and there is no DC12V output.

[0056] It should be understood that a PMOS chip is a PMOS transistor switch. A PMOS transistor is a field-effect transistor that uses a positive voltage to control the flow of current. It is made of a P-type semiconductor material and contains three main regions: the source, the drain, and the gate. In the off state, when the gate-source voltage (V_GS) is less than or equal to 0, the oxide layer between the gate and the P-type semiconductor prevents the flow of electrons. Therefore, there is no conductive path between the source and the drain, and the transistor is in the off state, with the drain-source current almost zero. In the on state, when the gate-source voltage (V_GS) is greater than a certain threshold voltage, the gate attracts holes in the P-type semiconductor, forming an inversion layer. This creates a conductive path between the source and the drain, and the transistor is in the on state, allowing current to flow from the source to the drain.

[0057] Figure 4FThe circuit structure of the indicator lights is shown, including: a first indicator light (RUN1) and a second indicator light (RUN2). The anode of the first indicator light is connected to a DC 12V voltage signal, and the cathode is grounded after being connected in series with resistor R18. The anode of the second indicator light is connected to a DC 3.3V voltage signal, and the cathode is grounded after being connected in series with resistor R19. When the first indicator light is on, it indicates a 12V DC voltage output; when it is off, the 12V DC voltage output is disabled. Similarly, when the second indicator light is on, it indicates a 3.3V DC voltage output; when it is off, the 3.3V DC voltage output is disabled.

[0058] Figure 5A , 5B 5C represents the H-bridge motor driver chip and its accessory circuitry on the control board. U1 is the H-bridge motor driver chip, capable of driving two independent motors. Pins AOUT1 and AOUT2 provide circuits for the DC brush motor coils, while pins BOUT1 and BOUT2 provide circuits for the DC air pump motor coils. The signal from pin AOUT1 of the H-bridge motor driver chip U1 passes through ferrite bead LB4, and the signal from pin AOUT2 passes through ferrite bead LB5 before being transmitted to pins AOUT1 and AOUT2 of the DC brush motor control circuit J2. The signal from pin BOUT1 of the H-bridge motor driver chip U1 passes through ferrite bead LB3, and the signal from pin BOUT2 passes through ferrite bead LB6 before being transmitted to pins BOUT1 and BOUT2 of the DC air pump motor control circuit J3.

[0059] Pin 12 of U1 is the DC brush motor channel reference voltage (VREFA), which, together with resistor R4 connected to pin 6 of U1, determines the maximum load current of the DC brush motor. Specifically, resistor R4 is connected to the AISEN pin. When the motor is running, the current flowing through the DC brush motor will generate a voltage drop across resistor R4. If this voltage drop reaches the voltage value set on the VREFA pin, the U1 chip will detect this voltage change and limit further current increase, thereby protecting the motor from damage due to overcurrent.

[0060] Pin U1-13 is the DC air pump motor channel reference voltage (VREFB), which, together with resistor R5 connected to pin U1-7, determines the maximum load current of the DC air pump motor. Specifically, resistor R5 is connected to the BISEN pin. When the motor is running, the current flowing through the DC air pump motor will generate a voltage drop across resistor R5. If this voltage drop reaches the voltage value set on the VREFB pin, the U1 chip will detect this voltage change and limit further current increase, thereby protecting the motor from damage due to overcurrent.

[0061] Pins U1-21 (AENBL) and U1-22 (BENBL) are the chip enable pins, with a fixed pull-up voltage of DC 3.3V. The chip controls the DC brush motor and DC air pump motor to always be in working condition.

[0062] Pin U1-20 (APHASE) is the floating input, controlling the bidirectional flow of current in the brush motor, meaning the motor rotates in both directions. Pin U1-23 (BPHASE) has a fixed pull-up voltage of DC 3.3V, causing the air pump current to be directed in one direction, meaning the nozzle is always in an air-purifying state, rather than an air-inhaling state.

[0063] Pins U1-26 (BI0) and U1-27 (BI1) are fixed at low level (GND). This combination determines that the DC air pump motor operates at its maximum load current. Pins U1-24 (AI0) and U1-25 (AI1) are fixed at high level (DC 3.3V). This combination determines that the DC brush motor operates at 38% of its maximum load current. Of course, to change the speed, only the combination of AI1 and AI0 needs to be changed. Pin U1-16 ( / MOTOR RESET) is fixed at high level; the chip does not require a reset. Pin U1-19 (DECAY) is floating, representing the hybrid decay mode, which includes fast decay and full decay. In fast decay mode, once the PWM chopper current threshold is reached, the H-bridge reverses conduction, causing the motor coil current to reverse. When the coil current approaches 0, the H-bridge turns off to prevent reverse current. In slow decay mode, the motor coil current freewheels by enabling the two FETs on the low side.

[0064] Figure 6 shows a partial circuit diagram of the control board. U2 and U3 are recessed photoelectric sensors, each containing a pair of photodiodes located opposite each other with a gap between them. These photodiodes can be a light-emitting diode (LED) and a photodiode, or two photodiodes, one for emitting light and the other for receiving light. The sensor's working principle is as follows:

[0065] When the air brush is not rotated to the obstruction position, meaning no object blocks the path between the photodiodes, the emitting photodiode emits light, which is received by the receiving photodiode. In this case, the light intensity detected by the sensor is sufficient, thus the circuit is in a conductive state.

[0066] When the air brush rotates to a specific angle, its baffle enters the sensor's detection area, blocking the light emitted from the transmitter and preventing it from reaching the receiver's photodiodes. Because the receiver cannot detect sufficient light, the sensor interprets the environment as darkening, and the circuit enters a cutoff state.

[0067] U4-U8 are logic inverters, U9-U10 are logic AND gate chips, and U3-U10 are all powered by DC 3.3V. Together with their accessory circuitry, they control the bidirectional rotation of the DC brush and provide feedback on the brush's status. (Specific details are not provided in the original text.) Figure 6A , 6B 6C will be explained.

[0068] Figures 6A-6C The working principle is as follows: When pin PHASE (U1-20) is pressed... Figure 5AWhen the U1 chip is at a high level, the DC brush rotates counterclockwise. At this time, the baffle of the DC brush motor does not block U2 or the U3 photoelectric sensor. U2 and U3 are both conducting, and U4-1 and U4-3 are both at a low level. After U4 is inverted, U5-1 and U5-3 are both at a high level. After U5 is inverted, U5-6 and U5-4 are both at a low level. After passing through the AND gates U9A and U9B, U9B-3 and U9A-7 are both at a low level. After U6 is inverted, U6-6 and U6-4 are both at a high level. After passing through the AND gates U10A and U10B, U7-1 and U7-3 are at a low level and a high level, respectively. When the DC air brush motor rotates counterclockwise to its full position, the motor baffle blocks U2 but not U3. U2 is cut off, while U3 remains conducting. U4-1 and U4-3 are at high and low levels, respectively. After being inverted by U4, U5-1 and U5-3 are at low and high levels, respectively. After being inverted by U5, U5-6 and U5-4 are at high and low levels, respectively. After passing through the AND gate U9, U9-B3 and U9A-7 are at low and high levels, respectively. After being inverted by U6, U6-6 and U6-4 are at high levels, respectively. After passing through the AND gate U10, U7-1 and U7-3 become high and low respectively. After being inverted by U7, U7-6 (i.e., U1-20) becomes low, and the DC brush rotates clockwise. After rotating a short distance, the brush motor baffle no longer blocks U2. At this time, both U2 and U3 are conducting, and U4-1 and U4-3 are both low. After being inverted by U4, U5-1 and U5-3 are both high. After being inverted by U5, U5-6 and U5-4 are both low. After passing through the AND gate U9... Afterwards, U9-B3 and U9A-7 are both at low level. After being inverted by U6, U6-6 and U6-4 are both at high level. After being ANDed by U10, U7-1 and U7-3 are at high and low level respectively. The level of U7-6, i.e., U1-20, does not change, so the direction of the brush motor remains unchanged. Similarly, when the DC brush motor rotates clockwise to the end, it blocks the U3 photoelectric sensor, U2 is turned on, U3 is turned off, and U4-1 and U4-3 are at low and high level respectively. After being inverted by U4... After phase inversion, U5-1 and U5-3 are at high and low levels respectively. After inversion by U5, U5-6 and U5-4 are at low and high levels respectively. After AND gate U9, U9-B3 and U9A-7 are at high and low levels respectively. After inversion by U6, U6-6 and U6-4 are at low and high levels respectively. After AND gate U10, U7-1 and U7-3 are both at low levels. After inversion by U7, U7-6 (i.e., U1-20) becomes high, and the DC brush rotates counterclockwise again. In this way, this part controls the DC brush motor to rotate alternately clockwise and counterclockwise.

[0069] In the embodiments of this application, terms such as "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. For example, "first XX" and "second XX" are merely used to distinguish different XXs and do not limit their order. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or execution order, and that terms such as "first" and "second" do not necessarily imply that they are different.

[0070] It should be noted that, in the embodiments of this application, the words "exemplary" or "for example" indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0071] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0072] It should be noted that the terms "component," "module," "system," etc., used in this specification are used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or a computer. As illustrated, applications running on computing devices and computing devices can both be components. One or more components may reside in a process and / or an execution thread, and components may be located on a single computer and / or distributed among two or more computers. Furthermore, these components can be executed from various computer-readable media on which various data structures are stored. Components can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system, and / or a network, such as the Internet interacting with other systems via signals).

[0073] Those skilled in the art will recognize that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this application.

[0074] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0076] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0077] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0078] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0079] In summary, this application provides a DC-driven cleaning system. This system uses a motor-driven air brush to clean the glass of a cabinet, achieving automatic dust removal. It enables timed cleaning of the glass in front of the camera, reducing reliance on manual cleaning and ensuring the camera can clearly capture road traffic conditions, thus improving the accuracy and quality of captured images. Therefore, this application effectively overcomes the various shortcomings of existing technologies and has high industrial applicability.

[0080] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A DC-driven cleaning system, characterized in that, include: Power board, control board, image acquisition unit, drive unit, cleaning components; The power board, control board, and image acquisition unit are electrically connected; the control board is equipped with an H-bridge motor drive chip, which is electrically connected to and controls the drive unit; the power board receives digital switch output signals related to image acquisition from the image acquisition unit, thereby controlling the power supply to the H-bridge motor drive chip, and thus controlling the start or stop of the drive unit; the drive unit is connected to and drives the cleaning component to perform rotation and cleaning operations; the image acquisition unit is a camera. The drive unit includes a DC air brush motor and a DC air pump motor, and the cleaning component includes an air brush device. The DC air brush motor is connected to and drives the air brush device to rotate clockwise or counterclockwise within the range of the cleaning target. The DC air pump motor is used to increase the air pump's inflation pressure. The air pump is connected to the air brush nozzle through a pipe. After the air pump's inflation pressure is increased and released from the air brush nozzle, it is blown toward the cleaning target. When the air brush device is working, it generates a corresponding working status signal; the control board receives and detects the working status signal of the air brush device, processes it into a signal format suitable for the image acquisition unit, and feeds back the DC air brush status signal to the image acquisition unit through the power board. The power board provides DC12V and DC3.3V voltages to the control board. The control board is also equipped with a logic chip and a photoelectric sensor chip. The DC12V voltage powers the H-bridge motor drive chip on the control board, and the DC3.3V voltage powers the logic chip and the photoelectric sensor chip. It is also provided to the H-bridge motor drive chip by series resistor voltage division as a reference voltage for the DC brush motor and the DC air pump motor. The power board includes: a power protection circuit, a step-down circuit, a logic inverting circuit, and an output control circuit; the power protection circuit is equipped with overcurrent protection and short-circuit protection; the step-down circuit converts DC12V voltage to DC3.3V, and the voltage fluctuation is within 50mV; the logic inverting circuit is used to feed back the DC air brush status signal to the camera; the output control circuit is used to control whether DC12V voltage is output. The power board's input signals include: positive and negative DC12V voltage signals from the system, digital switch output signals from the camera, and DC brush status signals from the control board; the power board's output signals include: DC12V voltage signals and DC3.3V voltage signals output to the control board, and DC brush status signals output to the camera.

2. The DC-driven cleaning system according to claim 1, characterized in that, After receiving the working status signal of the air brush device, the image acquisition unit sends it to the server so that users can monitor the working status of the air brush device in real time.

3. The DC-driven cleaning system according to claim 1, characterized in that, The output control circuit includes: one end of the ferrite bead LB3 is connected to the camera's DO+ signal ALARM_OUT_A, and the other end is connected to one end of the resistor R10. The other end of the resistor R10 is connected to the base of the NPN transistor Q1. The emitter of the NPN transistor Q1 is grounded, and the collector is connected to the gate of the high-power PMOS chip U3 through the connecting resistor R11. After the source and drain of the high-power PMOS chip U3 are turned on, it outputs a DC12V voltage signal. The camera's DO- signal ALARM_OUT_REF is connected to DC3.3V through the ferrite bead LB2.

4. The DC-driven cleaning system according to claim 3, characterized in that, The NPN transistor Q1 controls the gate voltage of the high-power PMOS chip U3; When the camera sends a DC12V output enable signal, DO+ and DO- are shorted, NPN transistor Q1 is turned on, the voltage difference between the gate and source of the PMOS chip reaches the turn-on voltage Vgsth, the high-power PMOS chip U3 is turned on, and DC12V voltage is output. When the camera sends a DC12V output disable signal, DO+ and DO- are disconnected, NPN transistor Q1 is turned off, the voltage difference between the gate and source of the PMOS chip cannot reach the turn-on voltage Vgsth, the high-power PMOS chip U3 is not turned on, and there is no DC12V output.

5. The DC-driven cleaning system according to claim 1, characterized in that, The power board is also equipped with a first indicator light and a second indicator light; the first indicator light indicates the output status of DC12V voltage by turning the light on or off; the second indicator light indicates the output status of DC3.3V voltage by turning the light on or off.

6. The DC-driven cleaning system according to claim 1, characterized in that, The control panel includes: The system consists of an H-bridge motor driver chip U1, photoelectric sensors U2-U3, logic inverters U4-U8, and logic AND gate chips U9A, U9B, U10A, and U10B. The outputs of photoelectric sensors U2 and U3 are connected to the inputs of the inverter U4, the output of inverter U4 is connected to the input of inverter U5, the output of inverter U5 is connected to the inputs of logic AND gate chips U9A and U9B, the outputs of logic AND gate chips U9A and U9B are connected to the inputs of the inverter U6, the output of inverter U6 is connected to the inputs of logic AND gate chips U10A and U10B, and the outputs of logic AND gate chips U10A and U10B are connected to the input of the inverter U7.

Images