Direct-current driving cleaning system

Abstract

The invention provides a direct-current driving cleaning system. The direct-current driving cleaning system comprises a power panel, a control panel, an image acquisition unit, a driving unit and a cleaning part, the power panel is electrically connected with the control panel and the image acquisition unit; an H-bridge motor driving chip is arranged on the control panel, and the H-bridge motor driving chip is electrically connected with and controls the driving unit; the power panel receives digital switching value output signals related to image acquisition from the image acquisition unit, so as to control the power supply of the H-bridge motor driving chip and further control the starting or stopping of the driving unit; and the driving unit is connected with the cleaning part and drives the cleaning part to rotate and clean. The air brush is driven by the motor to clean the cabinet glass, so that the function of automatic dust removal is achieved, the cabinet glass in front of the camera is cleaned regularly, dependence on manual cleaning is reduced, it is ensured that the camera can clearly capture road traffic conditions, and the accuracy and quality of captured images are improved.

Description

Technical Field

[0001] The present application relates to the field of automatic control technology, and in particular to a DC driven cleaning system. Background Art

[0002] Video surveillance cameras in smart transportation projects need to consider dust removal and heat dissipation issues during use, otherwise the picture quality will be affected after long-term operation. This design is used in the camera cabinet to remove dust from the cabinet glass regularly. In the field of surveillance cameras, the camera is installed in the cabinet, and the cabinet glass in front is exposed to the outdoor environment for a long time, which is easy to accumulate dust, which will seriously affect the camera's accurate capture of road traffic conditions. At present, the mainstream solutions on the market rely on manual regular cleaning, which is not only time-consuming and labor-intensive, but may also affect the monitoring effect due to untimely cleaning.

[0003] Therefore, there is an urgent need in the art for a technical solution that does not rely on manual regular cleaning, saves time and effort, and can automatically and regularly remove dust from glass. Summary of the invention

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

[0005] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present 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 is electrically connected to the control board and the image acquisition unit; an H-bridge motor drive chip is provided on the control board, and the H-bridge motor drive chip is electrically connected to and controls the drive unit; the power board receives a digital output signal related to image acquisition from the image acquisition unit, and controls the power supply of the H-bridge motor drive chip accordingly, thereby 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 the present application, the driving 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, and the air pump is connected to the air brush nozzle through a pipeline. The inflation pressure of the air pump is increased and released from the air brush nozzle to blow toward the cleaning target.

[0007] In some embodiments of the first aspect of the present application, the air brush device generates a corresponding working status signal when working; 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.

[0008] In some embodiments of the first aspect of the present application, after receiving the working status signal of the air brush device, the image acquisition unit sends the signal 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 the present application, the power board provides DC12V voltage and 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 driver 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 driver chip in the form of a series resistor voltage divider as a reference voltage for the DC air brush motor and the DC air pump motor.

[0010] Designed in this way, as the reference voltage Vref of the DC air brush motor and DC air pump motor, for the Isen pin of the H-bridge motor driver chip, selecting a suitable Rsense resistor and a suitable reference voltage Vref determines the speed of the DC air brush motor and the amount of air charged in the DC air pump drive nozzle, which also determines the cleaning ability of the air brush nozzle.

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

[0012] In some embodiments of the first aspect of the present application, the output control circuit includes: one end of the magnetic 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, 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, a DC12V voltage signal is output, and the DO-signal ALARM_OUT_REF of the camera is connected to DC3.3V through the magnetic bead LB2.

[0013] In some embodiments of the first aspect of the present application, the NPN transistor Q1 controls the gate voltage value of the high-power PMOS chip U3; when the camera sends a DC12V output enable signal, DO+ and DO- are short-circuited, the NPN transistor Q1 is turned on, the voltage difference between the gate and the 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 the source of the PMOS chip cannot reach the turn-on voltage Vgsth, the high-power PMOS chip U3 is not turned on, and the DC12V voltage has no output. .

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

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

[0016] As described above, a DC-driven cleaning system of the present application has the following beneficial effects: the present application uses a motor-driven air brush to clean the cabinet glass, thereby achieving the function of automatic dust removal, realizing the timed cleaning of the cabinet glass in front of the camera, reducing dependence on manual cleaning, and ensuring that the camera can clearly capture road traffic conditions, thereby improving the accuracy and quality of captured images. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a structural schematic diagram of a DC driven cleaning system in one embodiment of the present application.

[0018] Figure 2 Shown is a schematic diagram of a physical sample of a DC driven cleaning system in one embodiment of the present application.

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

[0020] Figure 4A Shown is a structural schematic diagram of a power protection circuit in an embodiment of the present application.

[0021] Figure 4B Shown is a partial circuit structure schematic diagram of a buck circuit in an embodiment of the present application.

[0022] Figure 4C Shown is a partial circuit structure schematic diagram of a buck circuit in an embodiment of the present application.

[0023] Figure 4D Shown is a circuit structure schematic diagram of a logic inversion circuit in an embodiment of the present application.

[0024] Figure 4E Shown is a circuit structure schematic diagram of an output control circuit in an embodiment of the present application.

[0025] Figure 4F Shown is a schematic diagram of the circuit structure of an indicator light in an embodiment of the present application.

[0026] Figure 5A , 5B 5C is a schematic diagram of a partial circuit structure of an H-bridge motor driver chip and its accessory circuits on a control board in one embodiment of the present application.

[0027] Fig. 6A , 6B 6C shows a partial structural circuit diagram of a control board in one embodiment of the present application. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0029] Before further describing the present invention in detail, the nouns and terms involved in the embodiments of the present invention are explained. The nouns and terms involved in the embodiments of the present invention are applicable 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 usually contains four switching elements (such as MOSFETs) to form an H-type structure, so that the motor can be rotated forward, reversed or stopped 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 being painted through a nozzle.

[0032] <3> Notch type photoelectric sensor: A sensor that detects the presence of an object by emitting light and detecting whether the object blocks the light. This sensor is usually used to detect the position, size or shape of an object and is widely used in automation equipment, robots, assembly lines, etc. Notch type sensors have a high ability to resist interference light and can work stably under various ambient light conditions.

[0033] Figure 1 The structural diagram of the DC drive cleaning system provided by the present application is shown, which includes: a power board, a control board, an image acquisition unit, a drive unit, and a cleaning component. The power board is electrically connected to the control board and the image acquisition unit; an H-bridge motor drive chip is provided on it, and the H-bridge motor drive chip is electrically connected to and controls the drive unit; the power board receives a digital switch output signal related to image acquisition from the image acquisition unit, and controls the power supply of the H-bridge motor drive chip accordingly, thereby 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.

[0034] Preferably, the driving 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, and the DC air pump motor is used to increase the inflation pressure of the air pump, and the air pump is connected to the air brush nozzle through a pipeline. The inflation pressure of the air pump is increased and released from the air brush nozzle to blow toward the cleaning target. The number of air brush nozzles can be one or more, and the preferred assembly method includes mirror-arranging pairs of air brush nozzles on the cleaning target.

[0035] It is understood that the DC air pump motor is used to drive the air pump, which starts working and sucks air from the atmosphere. The piston or rotor inside the air pump compresses the air, gradually increasing the pressure of the air. As the motor continues to operate, the air pump compresses the air to the required pressure level, such as from 0 to 300mmHg (500cc cylinder). The output end of the air pump is connected to the air brush nozzle through a pipe, and the release pressure and flow of the compressed air can be adjusted by controlling the switch of the valve or nozzle. When the compressed air is released through the nozzle, the high-pressure air flow can blow away the dust and other impurities on the cabinet glass to achieve the purpose of cleaning. The air pump is the power source of the nozzle, which provides the required pressure through compressed air. During the cleaning process, the air pump compresses the air and delivers it to the nozzle. This pressurized air is responsible for blowing away the dust on the surface of the cabinet glass. These nozzles can generate high-speed airflow to clean or paint the surface. The nozzle is designed so that the airflow can be ejected in a specific shape and pattern, such as a fan or a solid cone.

[0036] Exemplarily, the image acquisition unit may be a camera, and the power board receives the image acquisition-related digital switch output signal from the image acquisition unit as the DO signal of the camera. It should be understood that in the camera system, the DO signal refers to the Digital Output signal, that is, the digital output signal, and this embodiment specifically refers to the digital switch signal. The DO signal in this embodiment is used to control the power supply of the H-bridge motor driver chip, for example, DO+ and DO- are short-circuited, PMOS is turned on, DC12V output is allowed, DO+ and DO- are disconnected, PMOS is turned off, and DC12V output is prohibited.

[0037] The H-bridge motor driver chip is an integrated circuit for motor control, which can control the forward and reverse rotation and speed regulation of the motor. The H-bridge is composed of four main switching elements, which can be transistors, MOSFETs or IGBTs, which are distributed on the four vertical legs of the H-bridge, and the motor is connected in the middle of the H. By independently controlling these four switching elements, the H-bridge can change the direction of current flowing through the motor and realize the forward and reverse control of the motor. Specifically, the H-bridge motor driver chip selected in this embodiment, such as L298N, TB6612FNG, A4950, etc.

[0038] For ease of understanding, Figure 2 The DC-driven cleaning system on display is used as an example for explanation. The cleaning target is the cabinet glass. A camera is installed inside the cabinet. Two air brush nozzles are arranged in a mirror-like manner on the cabinet. The camera is turned on with timing control. The air brush nozzle rotates clockwise / counterclockwise within the cabinet glass range to spray air, thereby achieving the effect of dust removal on the glass, avoiding unclear camera images due to dust, which affects the camera shooting quality.

[0039] Preferably, the air brush generates corresponding working status signals when working, and these working status signals are used to indicate the operating status of the air brush, such as whether it is operating normally, whether it has encountered a fault, etc. The control board detects the working status signals of the DC air brush, processes these signals into a format suitable for the camera to receive, and then feeds them back to the camera through the power board; the camera uploads the received signals to the server (such as a local server or a cloud server); the server is responsible for storing video data and status signals, and provides remote access functions for users to log in and view through a client software or web interface, so that the working status of the air brush can be monitored in real time, and maintenance or repair measures can be taken in time when a fault is found.

[0040] In an embodiment of the present application, the power board provides a DC12V voltage and a DC3.3V voltage to the control board; a logic chip and a photoelectric sensor chip are also provided on the control board; the DC12V voltage powers the H-bridge motor driver 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 driver chip in the form of a series resistor voltage divider as a reference voltage for the DC air brush motor and the DC air pump motor.

[0041] As the reference voltage Vref of the DC air brush motor and DC air pump motor, for the Isen pin of the H-bridge motor driver chip, selecting the appropriate Rsense sampling resistor and the appropriate reference voltage Vref determines the speed of the DC air brush motor and the amount of air charged by the DC air pump drive nozzle, which also determines the cleaning capacity of the air brush nozzle. The Isen pin is usually used for current detection. By connecting a low-value, high-power rated resistor to ground (GND), a current detection loop can be formed. The working current of the motor flowing through this resistor will generate a voltage drop, which is proportional to the current, so the current can be detected by monitoring this voltage drop.

[0042] It should be understood that the DC3.3V of the control board is divided into two paths, which are respectively supplied to the A-phase and B-phase reference level input pins of the H-bridge driver chip after voltage division using series resistors, where A-phase is the DC air pump motor part and B-phase is the DC air brush motor part. One end of the two current limiting resistors is short-circuited to the ground, and the other end is respectively connected to the A-phase and B-phase current protection input pins of the H-bridge driver chip. The chip reference voltage and current limiting resistors jointly determine the maximum load current of the DC air pump motor and the DC air brush motor.

[0043] Furthermore, the DC air brush motor and DC air pump motor will draw more current when starting or stalling, which will 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, when the motor starts or stalls, if the current is too large and exceeds the PWM chopping threshold (maximum current), the output H-bridge is shut down, so as to achieve the purpose of not exceeding the maximum load current output.

[0044] Preferably, a groove-type photoelectric sensor chip can be used for photoelectric conversion. The groove-type photoelectric sensor is composed of a light source, a photodiode and a groove reflector. Its principle is to use photoelectric sensing technology to detect the existence, position, speed and direction of an object by blocking or reflecting light. The groove-type photoelectric sensor chip has significant advantages such as high precision, high repeatability, high anti-interference ability, and easy installation and alignment.

[0045] The overall structure and principle of the DC drive cleaning system have been explained above. The power board and the control board will be further explained below in conjunction with the specific circuit diagram.

[0046] like Figure 3 As shown, a schematic diagram of the circuit structure of the power board in the embodiment of the present invention is shown. The power board includes: a power protection circuit, a step-down circuit, a logic inversion circuit, an output control circuit and an indicator light. The input signals of the power board include: DC12V positive and negative voltage signals from the system (12VDC signal, GND signal), DO signals from the camera (DO+: ALARM_OUT_A signal and DO-: ALARM_OUT_REF signal), and a DC air brush status signal (PI_WIP_IN) from the control board. The output signals of the power board include: a DC12V voltage signal (12V_WIP_OUT signal) output to the control board, a DC3.3V voltage signal (V33_WIP_OUT signal), and a DC air 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 suppression diode D2, capacitor C1, capacitor C10, and solid-state capacitor E1. One end of the fuse F1 is connected to the DC12V+ voltage signal, and the other end is connected to one end of the diode D1 and one end of the bidirectional transient suppression diode D2 respectively; the other end of the bidirectional transient suppression diode D2 is grounded; the cathode of the diode D1 is connected to one end of the capacitor C1, capacitor C10, and solid-state capacitor E1 and connected to +DC12V, and the other ends of the capacitor C1, capacitor C10, and solid-state capacitor E1 are connected in parallel to the ground.

[0048] It should be understood that fuse F1 is used for overcurrent protection. If the current in the circuit exceeds the rated value of the fuse, the fuse will melt, thereby cutting off the circuit and preventing further damage. Diode D1 allows current to flow in one direction to prevent the positive and negative poles of DC12V from being short-circuited. Bidirectional transient suppression diode D2 can work in both directions to limit the voltage within a safe range. If the voltage exceeds its rated value, D2 will turn on in both forward and reverse directions to protect the circuit from voltage spikes. Capacitors C1 and C2 are used to smooth voltage fluctuations and reduce noise and ripples. Solid-state capacitor E1 usually has a larger capacitance value and is used for filtering and energy storage to provide a stable DC12V voltage.

[0049] Figure 4B and 4C The circuit structure of the buck circuit is shown, which includes a DCDC buck chip U1 and its accessory circuits, which are used to convert a DC12V voltage into a DC3.3V voltage with a ripple within 50mV. It should be understood that the ripple within 50mV refers to the fluctuation or noise level of the power supply output voltage. In a DC power supply, even if the output should be a constant voltage ideally, there will always be slight voltage fluctuations in practice, and these fluctuations are ripples. Ripple can be caused by a variety of factors, such as the design of the power supply itself, load changes, temperature changes, etc. The ripple referred to in this embodiment is within 50mV, which means that the fluctuation range of the output voltage will not exceed 50mV.

[0050] Exemplarily, the models of DCDC step-down chip U1 that can be selected include, but are not limited to, LM2675, LM3668, etc. from Texas Instruments, LT8705, LT8706, LT8640, LT8690, etc. from Analog Devices, TLE9871, TLE9863, TLE4206, etc. from Infineon, TPS54331, TPS54333, etc. from NXP, but the embodiments of the present application do not limit this.

[0051] Furthermore, a magnetic bead LB4 is provided at the output port of the power line of the power board, and finally outputs a DC3.3V voltage. One end of the magnetic bead LB4 is connected to the DC3.3V voltage and connected to one end of the capacitor C26, the other end of the capacitor C26 is grounded, and the other end of the magnetic bead LB4 is connected to the parallel capacitors C7 and C15, and the other ends of the capacitors C7 and C15 are short-circuited to the ground and output the V33_WIP_OUT signal. It should be understood that the role of the magnetic beads is to suppress high-frequency noise and spike currents. They are made of ferrite materials and have high resistivity and permeability, which makes them show good impedance characteristics at high frequencies.

[0052] Figure 4D The circuit structure of the logic inversion circuit is shown, which includes a logic inversion chip U2 and its accessory circuits, which are used to invert the rotation state of the DC air brush and feed it back to the camera. The logic inversion chip U2 is an integrated circuit used to realize the logic inversion function, which inverts the input logic signal state, that is, when the input is high level (HIGH), the output is low level (LOW), and when the input is low level, the output is high level. The A1 pin of the logic inversion chip U2 is connected to one end of the resistor R15, and the other end of the resistor R15 is connected to the DC air brush state signal (PI_WIP_IN) from the control board. The Y1 pin of the logic inversion chip U2 is connected to one end of the resistor R14, and the other end of the resistor R14 outputs the inverted DC air brush state signal (PI_CPU_OUT signal) to the camera.

[0053] Explanatory, if the rotation state of the air brush changes quickly, jitter may be generated in the output signal, and the logic inversion circuit can provide a certain de-jitter function to ensure signal stability. The logic inversion circuit also has a certain isolation and protection function, that is, it provides electrical isolation to protect the camera circuit from electrical interference or overvoltage generated by the air brush drive circuit. In addition, there is a mismatch between the input signal level of the camera 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 indicate the same state. Therefore, a logic inversion circuit is required to invert the signal level to ensure that the meaning of the signal is correctly expressed. The logic inversion chip in the embodiment of the present application can be a 74 series TTL logic chip (such as 74LS04, etc.), a 4000 series CMOS logic chip (such as 74HC04, etc.), a high-speed CMOS series (such as SN74HC04, CD74HC04, etc.), and this embodiment does not limit this.

[0054] Figure 4EThe circuit structure of the output control circuit is shown, which includes a high-power PMOS chip U3 and its accessory circuit. One end of the magnetic bead LB3 is connected to the DO+ signal (ALARM_OUT_A 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, and the collector is connected to the gate (G1 pin and G2 pin) of the high-power PMOS chip U3 through the resistor R11. The source (S1 pin and S2 pin are short-circuited) and the drain (D1 pin and D2 pin are short-circuited) of the high-power PMOS chip U3 are connected to the 12V_WIP signal. After the 12V_WIP signal is connected to the magnetic bead LB1, a DC12V voltage signal (12V_WIP_OUT signal) is output. The function of the magnetic bead LB1 is mainly to suppress current mutations and protect against circuit short circuits and other faults. This has been explained above and will not be repeated here.

[0055] The NPN transistor Q1 acts as a switch to control the gate voltage of the high-power PMOS chip U3. When the camera sends out a DC12V output enable signal, DO+ (ALARM_OUT_A) and DO- (ALARM_OUT_REF) are short-circuited, and the NPN transistor Q1 is turned on, so that the gate of the PMOS chip obtains an appropriate voltage, thereby controlling the switching state of the PMOS. More specifically, the high-power PMOS chip U3 is used to control the output of the DC12V power supply. When the NPN transistor Q1 is turned on, the voltage difference between the gate and the source of the PMOS chip reaches the turn-on voltage Vgsth, the PMOS is turned on, and the 12V_WIP signal is output. On the contrary, if the NPN transistor Q1 is not turned on, the voltage difference between the gate and the source of the PMOS chip cannot reach the turn-on voltage Vgsth, the PMOS is turned off, the high-power PMOS chip U3 is not turned on, and there is no DC12V voltage 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 composed of a P-type semiconductor material and contains three main regions, namely the source, drain, and gate. In the cut-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, so there is no conductive channel between the source and the drain, the transistor is in the cut-off state, and the drain-source current is almost 0. 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 to form an inversion layer, so that a conductive channel is formed between the source and the drain. At this time, 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 light is shown, which includes: a first indicator light (RUN1) and a second indicator light (RUN2). The anode of the first indicator light is connected to a DC12V voltage signal, and the cathode is connected to a series resistor R18 and then to ground. The anode of the second indicator light is connected to a DC3.3V voltage signal, and the cathode is connected to a series resistor R19 and then to ground. The first indicator light is on when there is a 12V DC voltage output, and the first indicator light is off when the 12V DC voltage is prohibited from being output. Similarly, the second indicator light is on when there is a 3.3V DC voltage output, and the second indicator light is off when the 3.3V DC voltage is prohibited from being output.

[0058] Figure 5A , 5B , 5C are the H-bridge motor driver chip and its accessory circuits on the control board, U1 is the H-bridge motor driver chip, which can drive 2 independent motors, AOUT1 and AOUT2 provide loops for the DC air brush motor coils, and BOUT1 and BOUT2 provide loops for the DC air pump motor coils. The signal of the AOUT1 pin of the H-bridge motor driver chip U1 passes through the magnetic bead LB4, and the signal of the AOUT2 pin passes through the magnetic bead LB5 and then is transmitted to the AOUT1 pin and AOUT2 pin of the DC air brush motor control circuit J2. The signal of the BOUT1 pin of the H-bridge motor driver chip U1 passes through the magnetic bead LB3, and the BOUT2 pin passes through the magnetic bead LB6 and then is transmitted to the BOUT1 pin and BOUT2 pin of the DC air pump motor control circuit J3.

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

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

[0061] U1-21 pin (AENBL) and U1-22 pin (BENBL) are chip enable pins, with a fixed pull-up voltage of DC3.3V. The chip controls the DC air brush motor and DC air pump motor to always be in working state.

[0062] U1-20 pin (APHASE) is a floating input, which controls the current flow of the air brush motor in both directions, that is, the motor rotates in both directions. U1-23 pin (BPHASE), the fixed pull-up voltage is DC3.3V, which makes the air pump current turn in a single direction, that is, the nozzle is always in the jet state, not the suction state.

[0063] U1-26 pin (BI0) is fixed to low level (GND), U1-27 pin (BI1) is fixed to low level, this level combination determines that the DC air pump motor works at the maximum load current; U1-24 pin (AI0) is fixed to low level, U1-25 pin (AI1) is fixed to high level (DC3.3V), this level combination determines that the DC air brush motor works at 38% of the maximum load current. Of course, in order to change the speed, you only need to change the level combination of AI1 and AI0; U1-16 pin ( / MOTOR RESET) is fixed to high level, and the chip has no reset requirement; U1-19 pin (DECAY) is floating, which is recorded as attenuation mixed mode, including fast attenuation and full attenuation. In fast attenuation mode, once the PWM chopping current threshold is reached, the H bridge is reversed, causing the motor coil current to reverse. When the coil current is close to 0, the H bridge is turned off to prevent reverse current. In slow attenuation mode, the motor coil current is allowed to continue to flow by enabling the two FETs on the low side.

[0064] Figure 6 shows a partial structural circuit diagram of the control board. U2 and U3 are notch-type photoelectric sensors. The notch-type photoelectric sensor includes a pair of photodiodes, which are located opposite each other with a gap in the middle. The two photodiodes can be a light-emitting diode (LED) and a photodiode, or two photodiodes, one of which is used to emit light and the other is used to receive light. The working principle of the sensor is:

[0065] When the air brush is not rotated to the blocking position, that is, there is no object blocking the pair of photodiodes, the photodiode at the transmitting end will emit light, and the photodiode at the receiving end can receive the light. In this case, the light intensity detected by the sensor is sufficient, so the circuit is in the on state.

[0066] When the air brush rotates to a certain angle, the baffle on it enters the detection area of ​​the sensor and blocks the pair of photodiodes. The light emitted by the transmitting end is blocked by the baffle and cannot reach the photodiode at the receiving end. Since the receiving end cannot detect enough light, the sensor will think that the environment has become darker, so the circuit is cut off.

[0067] U4-U8 are logic inverters, U9-U10 are logic AND gate chips, and the power supply voltage of U3-U10 is DC3.3V. They and the accessory circuits work together to control the bidirectional rotation of the DC air brush and output the DC air brush status feedback. Fig. 6A , 6B , 6C for explanation.

[0068] Figures 6A to 6C The working principle is as follows: When the U1-20 pin PHASE ( Figure 5AWhen the U1 chip in the circuit is at a high level, the DC air brush rotates counterclockwise. At this time, the baffle of the DC air brush motor does not block U2, nor does it block the U3 photoelectric sensor. U2 and U3 are both turned on, U4-1 and U4-3 are both at a low level. After inversion by U4, U5-1 and U5-3 are both at a high level. After inversion by U5, U5-6 and U5-4 are both at a low level. After passing through the AND gates of U9A and U9B, U9B-3 and U9A-7 are both at a low level. After inversion by U6, U6-6 and U6-4 are both at a high level. After passing through the AND gates of U10A and U10B, U7-1 and U7-3 are respectively at a low level and a high level. The DC air brush motor rotates counterclockwise to the end, the motor baffle blocks U2, but does not block U3, U2 is cut off, U3 is still on, U4-1 and U4-3 are high level and low level respectively, after inversion by U4, U5-1 and U5-3 are low level and high level respectively, after inversion by U5, U5-6 and U5-4 are high level and low level respectively, after passing through the AND gate of U9, U9-B3 and U9A-7 are low level and high level respectively, after inversion by U6, U6-6 and U6-4 are high level respectively , low level, after U10 AND gate, U7-1, U7-3 are high level, low level respectively, after U7 inversion, U7-6, that is, U1-20 becomes low level, the DC air brush turns to clockwise rotation, after a short distance rotation, the air brush motor baffle does not block U2, at this time U2, U3 are both turned on, U4-1, U4-3 are both low level, after U4 inversion, U5-1, U5-3 are both high level, after U5 inversion, U5-6, U5-4 are both low level, after U9 AND gate After that, U9-B3 and U9A-7 are both low level. After inversion by U6, U6-6 and U6-4 are both high level. After AND gate by U10, U7-1 and U7-3 are high level and low level respectively. The level of U7-6, i.e., U1-20, has not changed, so the direction of the air brush motor remains unchanged. Similarly, when the DC air brush motor rotates clockwise to the bottom, the photoelectric sensor U3 is blocked, U2 is turned on, U3 is turned off, U4-1 and U4-3 are low level and high level respectively. After inversion by U4, After the phase, U5-1 and U5-3 are high level and low level respectively. After U5 inversion, U5-6 and U5-4 are low level and high level respectively. After U9 and gate, U9-B3 and U9A-7 are high level and low level respectively. After U6 inversion, U6-6 and U6-4 are low level and high level respectively. After U10 and gate, U7-1 and U7-3 are both low level. After U7 inversion, U7-6, namely U1-20, becomes high level, and the DC air brush turns counterclockwise again. In this way, this part controls the DC air brush motor to rotate clockwise and counterclockwise alternately.

[0069] In the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with substantially the same functions and effects. For example, the first XX and the second XX are only used to distinguish different XXs, and do not limit their order. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different.

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

[0071] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers 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, 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 represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process, a processor, an object, an executable file, an execution thread, a program and / or a computer running on a processor. By way of illustration, both applications and computing devices running on a computing device can be components. One or more components may reside in a process and / or an execution thread, and a component may be located on a computer and / or distributed between two or more computers. In addition, these components may be executed from various computer-readable media having various data structures stored thereon. Components may, for example, communicate through local and / or remote processes according to 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 through signals).

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

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

[0075] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

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

[0077] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0078] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0079] In summary, the present application provides a DC-driven cleaning system, which cleans the cabinet glass by a motor-driven air brush, thereby achieving the function of automatic dust removal, realizing the 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, thereby improving the accuracy and quality of the captured images. Therefore, the present application effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0080] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present 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 is electrically connected to the control board and the image acquisition unit; an H-bridge motor driver chip is provided on the control board, and the H-bridge motor driver chip is electrically connected to and controls the drive unit; the power board receives a digital switch output signal related to image acquisition from the image acquisition unit, and controls the power supply of the H-bridge motor driver chip accordingly, thereby 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.

2. The DC driven cleaning system according to claim 1, characterized in that: The driving 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 pipeline. The inflation pressure of the air pump is increased and released from the air brush nozzle to blow toward the cleaning target.

3. The DC driven cleaning system according to claim 2, characterized in that: The air brush device generates a corresponding working status signal when working; 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.

4. The DC driven cleaning system according to claim 3, characterized in that: After receiving the working status signal of the air brush device, the image acquisition unit sends the signal to the server so that the user can monitor the working status of the air brush device in real time.

5. The DC driven cleaning system according to claim 2, characterized in that: The power board provides DC12V voltage and 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 driver 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 driver chip in the form of a series resistor voltage divider as a reference voltage for the DC air brush motor and the DC air pump motor.

6. The DC driven cleaning system according to claim 1, characterized in that: The power board comprises: Power protection circuit, step-down circuit, logic inverter circuit, output control circuit; The power protection circuit is provided with over-current protection and short-circuit protection; the step-down circuit converts the DC12V voltage into DC3.3V, and the voltage fluctuation is within 50mV; the logic inversion circuit is used to feed back the DC air brush state signal to the camera; the output control circuit is used to control whether the DC12V voltage is output; The input signals of the power board include: DC12V positive and negative voltage signals from the system, digital switch output signals from the camera, and DC air brush status signals from the control board; the output signals of the power board include: DC12V voltage signal output to the control board, DC3.3V voltage signal, and DC air brush status signal output to the camera.

7. The DC driven cleaning system according to claim 6, characterized in that: The output control circuit includes: one end of the magnetic bead LB3 is connected to the DO+ signal ALARM_OUT_A 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, 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, a DC12V voltage signal is output, and the DO- signal ALARM_OUT_REF of the camera is connected to DC3.3V through the magnetic bead LB2.

8. The DC driven cleaning system according to claim 7, characterized in that: The NPN transistor Q1 controls the gate voltage value of the high-power PMOS chip U3; When the camera sends out a DC12V output enable signal, DO+ and DO- are short-circuited, 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.

9. The DC driven cleaning system according to claim 6, characterized in that: The power board is also provided with a first indicator light and a second indicator light; the first indicator light represents the output state of the DC12V voltage by turning on or off; the second indicator light represents the output state of the DC3.3V voltage by turning on or off.

10. The DC driven cleaning system according to claim 1, characterized in that: The control panel comprises: H-bridge motor driver chip U1, photoelectric sensors U2-U3, logic inverters U4-U8, and logic AND gate chips U9-U10; the output ends of the photoelectric sensors U2 and U3 are connected to the input ends of the inverting logic device U4, the output end of the inverting logic device U4 is connected to the input end of the inverting logic device U5, the output end of the inverting logic device U5 is connected to the input ends of the logic AND gate chips U9A and U9B, the output ends of the logic AND gate chips U9A and U9B are connected to the input end of the logic inverter U6, the output end of the logic inverter U6 is connected to the input ends of the logic AND gate chips U10A and U10B, and the output ends of the logic AND gate chips U10A and U10B are connected to the input end of the logic inverter U7.

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