Charging anti-sparking circuit and device for sweeper and sweeper

Abstract

The utility model relates to the technical field of sweeper, especially a charging anti-sparking circuit, device and sweeper for sweeper. The circuit includes voltage detection unit, control unit and switch unit. The switch unit is connected in series between the L line and N line of charging socket and AC charger, the voltage detection unit connects L line and N line, and the control unit is connected with switch unit and voltage detection unit respectively. The voltage detection unit detects the voltage waveform between L line and N line when the charging gun is inserted into the socket, and outputs a low voltage signal to the control unit when the voltage value is less than the preset threshold. After receiving the low voltage signal, the control unit turns on the power supply connection between the charging socket and the AC charger through the switch unit, so that the charging gun charges the sweeper. The circuit detects the voltage waveform and turns on at the safe voltage point, avoiding current mutation and contact sparking, reducing electrode ablation and fire hazards.

Description

Technical Field

[0001] This utility model relates to the field of sweeper technology, and in particular to a charging anti-sparking circuit, device, and sweeper for use in sweepers. Background Technology

[0002] With the widespread use of small sweepers in urban sanitation, their charging safety has become an increasing concern. Currently, small sweepers are typically equipped with a manual charging port, allowing users to charge them using external charging guns (such as the Y30 and Y60 models with L, N, and PE lines). However, during operation, users often plug and unplug the charging gun while it is energized. This causes a surge current to be generated at the moment of insertion due to the energized L and N lines, leading to arcing at the contacts. This phenomenon not only causes electrode erosion on charging guns like the Y30 and Y60 but also increases contact resistance, leading to overheating and even melting of the charging head, posing a serious fire hazard.

[0003] In the automotive sector, existing DC and AC charging stations use communication protocols compliant with national standards to establish a handshake between charging devices before supplying power, thus providing anti-sparking functionality. However, these technologies are primarily applied to electric vehicles, are costly, and require complex control devices on the vehicle side. Due to commercial application and cost limitations, small sweepers cannot be directly connected to DC or AC charging stations, therefore these technologies cannot be directly adopted to avoid sparking issues during charging. Utility Model Content

[0004] The main purpose of this utility model is to provide a charging anti-sparking circuit, device and sweeper for sweepers, which aims to solve the technical problems of existing small sweepers where plugging and unplugging the charging gun while it is energized causes contact sparking, which poses the risk of electrode erosion and fire. The existing anti-sparking technology is also costly and not suitable for small sweepers.

[0005] To achieve the above objectives, this utility model provides a charging anti-sparking circuit for a sweeper, the circuit comprising: a voltage detection unit, a control unit, and a switching unit; The switching unit is connected in series between the charging socket of the sweeper and the AC charger, specifically the L line and N line. The voltage detection unit is connected to the L line and N line, and the control unit is connected to the switching unit and the voltage detection unit. The voltage detection unit is used to detect the voltage waveform between the L line and the N line when the user inserts the charging gun into the charging socket, and output a low voltage signal to the control unit when the voltage value corresponding to the voltage waveform is less than a preset voltage threshold. The control unit is configured to, upon receiving the low voltage signal, connect the power supply between the charging socket and the AC charger via the switching unit, so that the charging gun can charge the sweeper.

[0006] Optionally, the circuit further includes a power button, which supplies power to the voltage detection unit when pressed. The voltage detection unit is also used to detect the voltage waveform between the L line and the N line when the user inserts the charging gun into the charging socket and the user presses the power button.

[0007] Optionally, the circuit further includes: a current detection unit; The current detection unit is connected to the control unit; The current detection unit is used to detect the charging current of the charging gun, and when the charging current is less than a preset current threshold, it outputs a low current signal to the control unit. The control unit is also configured to disconnect the power supply connection between the charging socket and the AC charger via the switching unit when receiving the low current signal and the low voltage signal, so that the charging gun stops charging the sweeper.

[0008] Optionally, the circuit further includes: a status indication unit; The control unit is also configured to output a status indication signal to the status indication unit when the charging gun is charging the sweeper; The status indication unit is used to indicate the charging status of the sweeper when it receives the status indication signal.

[0009] Optionally, the voltage detection unit includes: a first resistor, a second resistor, and an optocoupler; Wherein, the first end of the first resistor is connected to the L line, the second end of the first resistor is connected to the first input terminal of the optocoupler, the first end of the second resistor is connected to the N line, the second end of the second resistor is connected to the second input terminal of the optocoupler, the first output terminal of the optocoupler is grounded, and the second output terminal of the optocoupler is connected to the control unit.

[0010] Optionally, the switching unit includes: a magnetic switch, a relay coil, a first diode, a second diode, a first switching transistor, and a third resistor; The magnetic switch is connected in series on the L line and the N line. The first end of the relay coil and the positive terminal of the first diode are grounded. The second end of the relay coil and the negative terminal of the first diode are connected to the output terminal of the first switching transistor. The input terminal of the first switching transistor is connected to the power supply. The control terminal of the first switching transistor is connected to the positive terminal of the second diode. The negative terminal of the second diode is connected to the first end of the third resistor. The second end of the third resistor is connected to the control unit.

[0011] In addition, to achieve the above objectives, this utility model also proposes a charging anti-sparking device for a sweeper, which includes the charging anti-sparking circuit for a sweeper described above.

[0012] In addition, to achieve the above objectives, this utility model also proposes a sweeper vehicle, which includes the charging anti-sparking circuit for the sweeper vehicle described above.

[0013] In this invention, the anti-sparking circuit for a sweeper uses a voltage detection unit to detect the voltage waveform between the L and N lines. When the voltage value is less than a preset threshold (such as a zero-crossing point), the switching unit is activated, preventing sudden current changes and effectively preventing sparking during charging gun insertion and removal, thus reducing the risk of contact erosion. It also avoids electrode erosion and increased contact resistance caused by sparking, reducing fire hazards caused by overheating and significantly improving charging safety. The circuit has a simple structure, requiring no complex communication protocols or control devices, making it suitable for small sweepers and reducing implementation costs. Users only need to insert the charging gun and wait for the circuit to automatically detect and activate, requiring no additional operation, thus improving charging convenience and user experience. By reducing contact erosion and wear, the lifespan of the charging gun and charging socket is extended, reducing maintenance and replacement costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first embodiment of the anti-sparking charging circuit for a sweeper according to the present invention; Figure 2 This is a schematic diagram of the second embodiment of the anti-sparking charging circuit for a sweeper according to the present invention; Figure 3 This is a circuit diagram of one embodiment of the anti-sparking charging circuit for a sweeper according to this utility model; Figure 4 This is a circuit diagram of an embodiment of the voltage detection unit in the charging anti-sparking circuit of a sweeper according to this utility model; Figure 5 This is a circuit diagram of an embodiment of the control unit in the anti-sparking circuit for the charging of a sweeper according to this utility model; Figure 6 This is a circuit diagram of an embodiment of the switching unit in the anti-sparking circuit for a sweeper according to this utility model; Figure 7 This is a circuit diagram of an embodiment of the current detection unit in the charging anti-sparking circuit of a sweeper according to this utility model; Figure 8 This is a circuit diagram of an embodiment of the status indicator unit in the charging anti-sparking circuit of a sweeper according to this utility model.

[0015] Explanation of icon numbers:

[0016] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0019] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0021] This utility model embodiment provides a charging anti-sparking circuit for a sweeper, referring to... Figure 1 As shown, Figure 1 This is a structural block diagram of the first embodiment of the anti-sparking circuit for charging a sweeper according to this utility model. The anti-sparking circuit for charging a sweeper according to this utility model includes: a voltage detection unit 10, a control unit 20, and a switching unit 30; The switch unit 30 is connected in series between the charging socket of the sweeper and the AC charger, with the L line and N line connected in series. The voltage detection unit 10 is connected to the L line and N line. The control unit 20 is connected to the switch unit 30 and the voltage detection unit 10. The voltage detection unit 10 is used to detect the voltage waveform between the L line and the N line when the user inserts the charging gun into the charging socket, and output a low voltage signal to the control unit 20 when the voltage value corresponding to the voltage waveform is less than a preset voltage threshold. The control unit 20 is used to connect the power supply between the charging socket and the AC charger through the switching unit 30 when the low voltage signal is received, so that the charging gun can charge the sweeper.

[0022] It should be noted that the voltage detection unit 10 is used to detect the voltage waveform between the L (live) wire and the N (neutral) wire in the charging socket. When the user inserts the charging gun into the charging socket, the voltage detection unit 10 monitors the voltage change between the L and N wires in real time. When the voltage value corresponding to the detected voltage waveform is less than a preset voltage threshold (e.g., near the zero-crossing point of AC power), a low-voltage signal is output to the control unit 20. By accurately detecting the voltage waveform, the voltage detection unit 10 ensures that the circuit conducts at the lowest voltage point (such as the zero-crossing point), avoiding arcing caused by voltage surges. The control unit 20 receives the signal from the voltage detection unit 10 and controls the switching unit 30 to open and close based on the signal. When the control unit 20 receives the low-voltage signal output by the voltage detection unit 10, it determines that the current voltage is within a safe range (such as the zero-crossing point), and then sends a conduction command to the switching unit 30 to connect the power supply between the charging socket and the AC charger. As the core control part of the circuit, the control unit 20 ensures that the switching unit 30 operates at a safe voltage point, avoiding current surges and contact arcing. The switching unit 30 controls the power supply connection between the charging socket and the AC charger. The switching unit 30 is connected in series on the L and N lines and receives commands from the control unit 20. When the control unit 20 issues a conduction command, the switching unit 30 closes, allowing current to flow and charging the sweeper; when the control unit 20 does not issue a command or issues a disconnect command, the switching unit 30 remains open. With the coordinated action of the voltage detection unit 10 and the control unit 20, the switching unit 30 ensures that the power supply connection is maintained at a safe voltage point, preventing sparking caused by sudden current changes.

[0023] It should be understood that the L line (live wire) is the live line in AC power, responsible for transmitting electrical energy. The N line (neutral wire) is the neutral line in AC power, forming a complete circuit loop together with the L line. The voltage detection unit 10 monitors the voltage waveform between the L and N lines to ensure the circuit operates under safe conditions, providing a path for power transmission to the charging gun. The charging socket connects the charging gun to the sweeper's charging circuit, serving as an interface between the two and ensuring that electrical energy can be transferred to the sweeper's battery. The AC charger converts AC power into DC power suitable for charging the sweeper's battery, providing the necessary power for charging. The charging gun connects the external power source to the sweeper's charging socket, acting as a medium for power transmission, transferring electrical energy from the external power source to the sweeper's charging circuit. All these components work together; the voltage detection unit 10 detects the voltage waveform, and the control unit 20 controls the switching unit 30 at a safe voltage point, thus preventing arcing during charging gun insertion and removal, improving charging safety and equipment reliability.

[0024] Furthermore, the voltage detection unit 10 may include a voltage sensor, a comparator, and a signal conditioning circuit. The voltage sensor is used to detect the voltage waveform between the L line and N line in real time, for example, using a voltage divider resistor or a dedicated voltage detection chip. The comparator compares the detected voltage value with a preset voltage threshold, and outputs a low-voltage signal when the voltage is below the threshold. The signal conditioning circuit filters, amplifies, and processes the detected voltage signal to ensure signal stability and reliability. The signal conditioning circuit may include a voltage divider resistor, an operational amplifier, and an ADC (analog-to-digital converter). The control unit 20 may include a microcontroller, logic circuitry, and a drive circuit. The microcontroller receives signals from the voltage detection unit 10 and controls the switching unit 30 to open and close according to preset logic. The logic circuitry, such as AND gates and OR gates, is used to implement simple control logic. The drive circuitry amplifies the control signal to drive the operation of the switching unit 30. The switching unit 30 may include a relay, a solid-state relay, and a MOSFET or IGBT. The relay is controlled by the signal from the control unit 20 and is suitable for low-power applications. The solid-state relay is used for applications without mechanical contacts and has a fast response speed, making it suitable for high-frequency switching. The MOSFET or IGBT is used for high-power applications and is controlled by the signal from the control unit 20 to achieve fast switching.

[0025] In one embodiment, reference is made to Figure 3 The voltage detection unit includes: a first resistor R1, a second resistor R2, and an optocoupler U1; Wherein, the first end of the first resistor R1 is connected to the L line, the second end of the first resistor R1 is connected to the first input end of the optocoupler U1, the first end of the second resistor R2 is connected to the N line, the second end of the second resistor R2 is connected to the second input end of the optocoupler U1, the first output end of the optocoupler U1 is grounded, and the second output end of the optocoupler U1 is connected to the control unit.

[0026] It should be noted that the voltage detection unit achieves zero-crossing detection of the voltage waveform between the L and N lines through the combination of the first resistor R1, the second resistor R2, and the optocoupler U1. The first resistor R1 and the second resistor R2 are used for voltage division and current limiting, reducing the high voltage on the L and N lines to a range that the optocoupler U1 can safely handle. The optocoupler U1 isolates the high-voltage side (L and N lines) from the low-voltage side (control unit), while converting the voltage signal into an optical signal, and then into an electrical signal for output. The input terminal of the optocoupler U1 is connected to the high-voltage side, and the output terminal is connected to the low-voltage side, achieving electrical isolation. The voltage waveform of alternating current is a sine wave, and its voltage value changes periodically from positive to negative; the zero-crossing point is the moment when the voltage value is zero. When the voltage between the L and N lines is greater than the conduction voltage of the optocoupler U1, the input terminal of the optocoupler U1 conducts, and a low-level signal is generated at the output terminal. When the voltage between the L and N lines is less than the turn-on voltage of optocoupler U1, the input of optocoupler U1 is cut off, and a high-level signal is generated at the output. During the positive and negative half-cycles of the AC voltage waveform, when the voltage value is close to zero, the input voltage of optocoupler U1 is insufficient to turn it on, and the output changes from low to high. When the voltage value is far from zero, the input of optocoupler U1 turns on, and the output changes from high to low. By detecting the high-low level changes at the output of optocoupler U1, it can be determined whether the voltage waveform is at a zero-crossing point.

[0027] In one embodiment, reference is made to Figure 3 The switching unit includes: a magnetic switch K, a relay coil L1, a first diode D1, a second diode D2, a first switching transistor Q1, and a third resistor R3; The magnetic switch K is connected in series on the L line and the N line. The first end of the relay coil L1 and the positive terminal of the first diode D1 are grounded. The second end of the relay coil L1 and the negative terminal of the first diode D1 are connected to the output terminal of the first switch Q1. The input terminal of the first switch Q1 is connected to the power supply V1. The control terminal of the first switch Q1 is connected to the positive terminal of the second diode D2. The negative terminal of the second diode D2 is connected to the first end of the third resistor R3. The second end of the third resistor R3 is connected to the control unit.

[0028] It should be noted that the magnetic switch K is connected in series on the L and N lines to control the on / off state of the L and N lines. The on / off state of the magnetic switch K is controlled by the magnetic field of the relay coil L1. The relay coil L1 is used to generate the magnetic field to control the on / off state of the magnetic switch K. The on / off state of the relay coil L1 is controlled by the first switching transistor Q1. The first diode D1 is used for freewheeling to protect the first switching transistor Q1 from the reverse voltage surge generated when the relay coil L1 is de-energized. The first switching transistor Q1 is used to control the on / off state of the relay coil L1. The on / off state of the first switching transistor Q1 is controlled by the control unit through the second diode D2 and the third resistor R3. The second diode D2 is used to isolate the control signal to prevent reverse current from affecting the control unit. The third resistor R3 is used for current limiting to protect the output terminal of the control unit. The control unit outputs a high-level signal, which drives the first switching transistor Q1 to conduct through the third resistor R3 and the second diode D2. The control unit outputs a low-level signal to turn off the first switching transistor Q1. When the first switching transistor Q1 is turned on, the relay coil L1 is energized, generating a magnetic field that closes the magnetic switch K, connecting the L and N lines. When the first switching transistor Q1 is turned off, the relay coil L1 is de-energized, the magnetic field disappears, the magnetic switch K opens, and the L and N lines are disconnected. When the first switching transistor Q1 is turned off, the reverse voltage generated by the relay coil L1 is released through the first diode D1, preventing damage to the first switching transistor Q1.

[0029] Furthermore, referring to Figure 2 The circuit further includes a power button 40, which supplies power to the voltage detection unit 10 when the power button 40 is pressed. The voltage detection unit 10 is also used to detect the voltage waveform between the L line and the N line when the user inserts the charging gun into the charging socket and the user presses the power button 40.

[0030] It should be noted that the power button 40 provides a start signal to the voltage detection unit 10, ensuring that the voltage detection unit 10 only starts working after the user presses the button. The power button 40 may include a mechanical button and an electronic switch; the mechanical button is used to connect the circuit when pressed and disconnect the circuit when released. The electronic switch, such as a MOSFET or a relay, is used to control the power supply to the voltage detection unit 10. When the user presses the power button 40, the circuit supplies power to the voltage detection unit 10, causing it to start detecting the voltage waveform between the L line and N line, increasing the user's initiative in operation, ensuring that the voltage detection unit 10 only works when needed, and reducing standby power consumption.

[0031] Furthermore, referring to Figure 2 The circuit further includes: a current detection unit 50; The current detection unit 50 is connected to the control unit 20; The current detection unit 50 is used to detect the charging current of the charging gun, and when the charging current is less than a preset current threshold, it outputs a low current signal to the control unit 20. The control unit 20 is also configured to disconnect the power supply connection between the charging socket and the AC charger via the switching unit 30 when it receives the low current signal and the low voltage signal, so that the charging gun stops charging the sweeper.

[0032] It should be noted that during the charging process of the sweeper, the charging current gradually decreases as the battery charge increases. When the battery is nearly fully charged, the charging current drops significantly. The current detection unit 50 sets a preset current threshold (e.g., when the charging current is less than 0.1A) to determine whether charging is complete. The current detection unit 50 monitors the charging current in real time, and considers charging complete when the detected charging current is less than the preset threshold. If the charging connection is directly disconnected during charging, sudden current changes may cause arcing (sparking) between the contacts, which could damage the equipment and pose a safety hazard. The voltage detection unit 10 outputs a low-voltage signal when the voltage waveform crosses zero (minimum voltage value) to ensure a safe timing for disconnection. The current detection unit 50 outputs a low-current signal when the charging current is less than the preset threshold, indicating that charging is complete or the current is abnormal. When the control unit 20 receives both the low-voltage and low-current signals simultaneously, it disconnects the power supply at a safe voltage point via the switching unit 30 to prevent sparking.

[0033] Furthermore, referring to Figure 2 The circuit further includes: a status indication unit 60; The control unit 20 is also used to output a status indication signal to the status indication unit 60 when the charging gun is charging the sweeper; The status indication unit 60 is used to indicate the charging status of the sweeper when it receives the status indication signal.

[0034] It should be noted that the status indicator unit 60 can receive status indicator signals from the control unit 20, and illuminate indicator lights, update the display screen, or trigger a buzzer according to the signal content, providing users with intuitive charging status feedback so that users can understand the charging progress and abnormal situations.

[0035] Furthermore, to achieve the above objectives, this utility model also proposes a charging anti-sparking device for a sweeper, which includes the charging anti-sparking circuit for a sweeper described above. The specific structure of this charging anti-sparking circuit for a sweeper is as described in the above embodiments. Since this charging anti-sparking device for a sweeper adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0036] Furthermore, to achieve the above objectives, this utility model also proposes a sweeper vehicle, which includes the charging anti-sparking circuit for the sweeper vehicle described above. The specific structure of this charging anti-sparking circuit for the sweeper vehicle is as described in the above embodiments. Since this sweeper vehicle adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0037] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A charging anti-sparking circuit for a sweeper vehicle, characterized in that, The circuit includes: a voltage detection unit, a control unit, and a switching unit; The switching unit is connected in series between the charging socket of the sweeper and the AC charger, specifically the L line and N line. The voltage detection unit is connected to the L line and N line, and the control unit is connected to the switching unit and the voltage detection unit. The voltage detection unit is used to detect the voltage waveform between the L line and the N line when the user inserts the charging gun into the charging socket, and output a low voltage signal to the control unit when the voltage value corresponding to the voltage waveform is less than a preset voltage threshold. The control unit is configured to, upon receiving the low voltage signal, connect the power supply between the charging socket and the AC charger via the switching unit, so that the charging gun can charge the sweeper.

2. The anti-sparking charging circuit for a sweeper as described in claim 1, characterized in that, The circuit further includes a power button, which supplies power to the voltage detection unit when the power button is pressed. The voltage detection unit is also used to detect the voltage waveform between the L line and the N line when the user inserts the charging gun into the charging socket and the user presses the power button.

3. The anti-sparking charging circuit for a sweeper as described in claim 1, characterized in that, The circuit also includes: a current detection unit; The current detection unit is connected to the control unit; The current detection unit is used to detect the charging current of the charging gun, and when the charging current is less than a preset current threshold, it outputs a low current signal to the control unit. The control unit is further configured to disconnect the power supply connection between the charging socket and the AC charger via the switching unit when receiving the low current signal and the low voltage signal, so that the charging gun stops charging the sweeper.

4. The anti-sparking charging circuit for a sweeper as described in claim 1, characterized in that, The circuit further includes: a status indication unit; The control unit is also configured to output a status indication signal to the status indication unit when the charging gun is charging the sweeper; The status indication unit is used to indicate the charging status of the sweeper when it receives the status indication signal.

5. The anti-sparking charging circuit for a sweeper as described in claim 1, characterized in that, The voltage detection unit includes: a first resistor, a second resistor, and an optocoupler; Wherein, the first end of the first resistor is connected to the L line, the second end of the first resistor is connected to the first input terminal of the optocoupler, the first end of the second resistor is connected to the N line, the second end of the second resistor is connected to the second input terminal of the optocoupler, the first output terminal of the optocoupler is grounded, and the second output terminal of the optocoupler is connected to the control unit.

6. The anti-sparking charging circuit for a sweeper as described in claim 1, characterized in that, The switching unit includes: a magnetic switch, a relay coil, a first diode, a second diode, a first switching transistor, and a third resistor; The magnetic switch is connected in series on the L line and the N line. The first end of the relay coil and the positive terminal of the first diode are grounded. The second end of the relay coil and the negative terminal of the first diode are connected to the output terminal of the first switching transistor. The input terminal of the first switching transistor is connected to the power supply. The control terminal of the first switching transistor is connected to the positive terminal of the second diode. The negative terminal of the second diode is connected to the first end of the third resistor. The second end of the third resistor is connected to the control unit.

7. A charging anti-sparking device for a sweeper vehicle, characterized in that, The anti-sparking charging device for the sweeper includes the anti-sparking charging circuit for the sweeper as described in any one of claims 1 to 6.

8. A sweeper vehicle, characterized in that, The sweeper includes the anti-sparking circuit for charging the sweeper as described in any one of claims 1 to 6.

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