Charging control circuit of sweeper and sweeper

Abstract

The utility model provides a charging control circuit of a sweeper and the sweeper. The charging control circuit is electrically connected with a charging circuit of the sweeper and comprises a positive charging end, a negative charging end, a voltage detection circuit, an overvoltage protection circuit and a control circuit. And the positive charging end and the negative charging end are electrically connected with the positive electrode and the negative electrode of the battery pack respectively. The voltage detection circuit is electrically connected with the anode of the battery pack through the anode charging end. The voltage detection circuit detects the charging voltage of the positive electrode of the battery pack. The overvoltage protection circuit is electrically connected with the voltage detection circuit; the overvoltage protection circuit provides an overvoltage protection threshold value and judges whether the charging voltage is higher than the overvoltage protection threshold value or not. The control circuit is electrically connected with the overvoltage protection circuit and the charging circuit; and when the charging voltage is higher than an overvoltage protection threshold value, the control circuit controls the charging circuit to be disconnected from the battery pack, so that the charging circuit stops charging the battery pack. The structure is simple, too many communication fractures do not need to be occupied, the material cost is low, and the device is suitable for being popularized in medium-end and low-end products.

Description

Technical Field

[0001] The present application relates to the technical field of sweeping machines, and in particular to a charging control circuit of a sweeping machine and the sweeping machine. Background Art

[0002] With the increasing application of lithium-ion batteries, lithium-ion batteries are increasingly used in power battery systems, such as sweepers, vacuum cleaners, etc. Multi-string power battery packs have a large capacity. If an irregular charging voltage is used, it will cause irreparable losses if it catches fire or explodes. In order to achieve safe use, it is very important to monitor the charging voltage and charging current in the lithium battery so that the entire battery management system can effectively manage the protection circuit and ensure the normal service life and safety performance of the lithium battery. In related technologies, the circuit design is complex, requires many communication ports, and has high material costs, making it difficult to promote in mid- and low-end products. Utility Model Content

[0003] The present application provides a charging control circuit of a sweeping machine and a sweeping machine with a simple circuit structure and low cost.

[0004] The present application provides a charging control circuit of a sweeping machine, which is electrically connected to a charging circuit, and includes:

[0005] A positive charging terminal and a negative charging terminal, respectively used to electrically connect to the positive electrode and the negative electrode of the battery pack;

[0006] A voltage detection circuit is electrically connected to the positive electrode of the battery pack through the positive electrode charging terminal; the voltage detection circuit detects the charging voltage of the positive electrode of the battery pack;

[0007] an overvoltage protection circuit, electrically connected to the voltage detection circuit; the overvoltage protection circuit provides an overvoltage protection threshold and determines whether the charging voltage is higher than the overvoltage protection threshold; and

[0008] The control circuit is electrically connected to the overvoltage protection circuit and the charging circuit; when the charging voltage is higher than the overvoltage protection threshold, the control circuit controls the charging circuit to be disconnected from the battery pack, so that the charging circuit stops charging the battery pack.

[0009] Optionally, the voltage detection circuit includes a first operational amplifier, a first voltage divider circuit, and a first feedback branch, wherein the first voltage divider circuit is electrically connected between the positive charging terminal and the ground terminal; the non-inverting input terminal of the first operational amplifier is electrically connected to the first voltage divider node of the first voltage divider circuit, the first feedback branch is electrically connected between the inverting input terminal and the output terminal of the first operational amplifier, the power supply terminal of the first operational amplifier is electrically connected to the DC power supply terminal, and the ground terminal of the first operational amplifier is electrically connected to the ground terminal;

[0010] The first voltage-dividing circuit comprises a first voltage-dividing resistor and a second voltage-dividing resistor connected in series, and the first voltage-dividing node is located between the first voltage-dividing resistor and the second voltage-dividing resistor; and / or

[0011] The first feedback branch comprises a first feedback resistor electrically connected between the inverting input terminal and the output terminal of the first operational amplifier; and / or

[0012] The voltage detection circuit also includes a first current limiting resistor, a first end of the first current limiting resistor is electrically connected to the output end of the first operational amplifier, and a second end of the first current limiting resistor is electrically connected to the output end of the voltage detection circuit.

[0013] Optionally, the overvoltage protection circuit includes a second operational amplifier and a second voltage divider circuit, the second voltage divider circuit is electrically connected between a DC power supply terminal and a ground terminal, a non-inverting input terminal of the second operational amplifier is electrically connected to an output terminal of the voltage detection circuit, an inverting input terminal of the second operational amplifier is electrically connected to a second voltage divider node of the second voltage divider circuit, a power supply terminal of the second operational amplifier is electrically connected to the DC power supply terminal, and a ground terminal of the second operational amplifier is electrically connected to a ground terminal;

[0014] The second voltage-dividing circuit comprises a third voltage-dividing resistor and a fourth voltage-dividing resistor connected in series, the second voltage-dividing node is located between the third voltage-dividing resistor and the fourth voltage-dividing resistor, and the second voltage-dividing circuit provides the overvoltage protection threshold through the second voltage-dividing node; and / or

[0015] The overvoltage protection circuit also includes a second current limiting resistor and a first diode, the anode of the first diode is electrically connected to the output end of the second operational amplifier through the second current limiting resistor, and the cathode of the first diode is electrically connected to the output end of the overvoltage protection circuit.

[0016] Optionally, the control circuit includes a controller and a first switch tube, the first switch tube is electrically connected to the output end of the overvoltage protection circuit, the controller includes a first detection end and a first control end, the controller is electrically connected to the first switch tube through the first detection end, and the controller is electrically connected to the charging circuit through the first control end;

[0017] The first electrode of the first switch tube is electrically connected to the output end of the overvoltage protection circuit, the second electrode of the first switch tube is electrically connected to the ground end, and the third electrode of the first switch tube is electrically connected to the first detection end; and / or

[0018] The control circuit further includes a first bias resistor electrically connected between the first electrode and the second electrode of the first switch tube; and / or

[0019] The first switch tube includes an N-type MOS tube or an NPN-type transistor.

[0020] Optionally, the charging control circuit also includes an enable control circuit, which is electrically connected between the positive charging terminal and the voltage detection circuit, and the control circuit is electrically connected to the enable control circuit. The control circuit controls the on-off of the voltage detection circuit and the positive charging terminal by controlling the on-off of the enable control circuit.

[0021] Optionally, the enabling control circuit includes a second switch tube and a third switch tube; the control circuit includes a controller, the controller includes a second control end, the controller is electrically connected to the second switch tube through the second control end, the third switch tube is electrically connected between the positive charging end and the voltage detection circuit, and is electrically connected to the second switch tube; the controller controls the on-off of the second switch tube through the second control end, controls the on-off of the third switch tube, so as to control the on-off between the voltage detection circuit and the positive charging end;

[0022] The enabling control circuit further includes a third current limiting resistor electrically connected between the second control terminal and the first electrode of the second switch tube; and / or

[0023] The enabling control circuit further includes a fourth current limiting resistor electrically connected between the second electrode of the second switch tube and the first electrode of the third switch tube; and / or

[0024] The enabling control circuit further includes a second bias resistor electrically connected between the first electrode of the third switch tube and the second electrode of the third switch tube; and / or

[0025] The second switch tube includes an N-type MOS tube or an NPN-type transistor; and / or

[0026] The third switch tube includes a P-type MOS tube or a PNP-type transistor.

[0027] Optionally, the charging control circuit further includes a current detection circuit and an overcurrent protection circuit, wherein the current detection circuit is electrically connected to the negative electrode of the battery pack through the negative electrode charging terminal, the overcurrent protection circuit is electrically connected to the current detection circuit, and the control circuit is also electrically connected to the overcurrent protection circuit; wherein,

[0028] The current detection circuit detects the charging current of the negative electrode of the battery pack, the overcurrent protection circuit provides an overcurrent protection threshold, and determines whether the charging current is higher than the overcurrent protection threshold. When the charging current is higher than the overcurrent protection threshold, the control circuit controls the charging circuit to disconnect from the battery pack, so that the charging circuit stops charging the battery pack.

[0029] Optionally, the current detection circuit includes a detection resistor electrically connected between the negative charging terminal and the ground terminal;

[0030] The current detection circuit further includes a third operational amplifier, a fifth current limiting resistor, a sixth current limiting resistor, and a second feedback resistor, wherein the non-inverting input terminal of the third operational amplifier is electrically connected to the first end of the detection resistor through the fifth current limiting resistor, the inverting input terminal of the third operational amplifier is electrically connected to the second end of the detection resistor through the sixth current limiting resistor, and the second feedback resistor is electrically connected between the inverting input terminal and the output terminal of the third operational amplifier; and / or

[0031] The current detection circuit also includes a seventh current limiting resistor, a first end of the seventh current limiting resistor is electrically connected to the output end of the third operational amplifier, and a second end of the seventh current limiting resistor is electrically connected to the output end of the current detection circuit.

[0032] Optionally, the overcurrent protection circuit includes a fourth operational amplifier and a third voltage divider circuit, the third voltage divider circuit is electrically connected between a DC power supply terminal and a ground terminal, a non-inverting input terminal of the fourth operational amplifier is electrically connected to an output terminal of the current detection circuit, an inverting input terminal of the fourth operational amplifier is electrically connected to a third voltage divider node of the third voltage divider circuit, a power supply terminal of the fourth operational amplifier is electrically connected to the DC power supply terminal, and a ground terminal of the fourth operational amplifier is electrically connected to a ground terminal;

[0033] The third voltage-dividing circuit comprises a fifth voltage-dividing resistor and a sixth voltage-dividing resistor connected in series, the third voltage-dividing node is located between the fifth voltage-dividing resistor and the sixth voltage-dividing resistor, and the third voltage-dividing circuit provides the overcurrent protection threshold through the third voltage-dividing node; and / or

[0034] The overcurrent protection circuit also includes an eighth current limiting resistor and a second diode, wherein the anode of the second diode is electrically connected to the output end of the fourth operational amplifier through the eighth current limiting resistor, and the cathode of the second diode is electrically connected to the output end of the overcurrent protection circuit.

[0035] The present application also provides a sweeping machine, comprising:

[0036] Battery pack;

[0037] a charging circuit, electrically connected to the battery pack and supplying power to the battery pack; and

[0038] As in the charging control circuit of a sweeping machine as described in any of the above embodiments, the positive charging terminal of the charging control circuit is electrically connected to the battery pack and the charging circuit, and the charging control circuit is used to control the connection and disconnection of the charging circuit and the battery pack.

[0039] The embodiment of the present application provides a charging control circuit of a sweeper and a sweeper. The charging control circuit is provided with a voltage detection circuit, an overvoltage protection circuit and a control circuit, the voltage detection circuit is electrically connected to the positive electrode of the battery pack through the positive charging terminal, the voltage detection circuit is used to detect the charging voltage of the positive electrode of the battery pack, the overvoltage protection circuit is electrically connected to the voltage detection circuit, the overvoltage protection circuit is used to provide an overvoltage protection threshold, and it is determined whether the charging voltage is higher than the overvoltage protection threshold, the control circuit is electrically connected to the overvoltage protection circuit and the charging circuit, and the control circuit is used to control the charging circuit to disconnect from the battery pack when the charging voltage is higher than the overvoltage protection threshold, so that the charging circuit stops charging the battery pack. With such a configuration, when the charging circuit charges the battery pack, it is ensured that the charging voltage detected by the voltage detection circuit is not higher than the overvoltage protection threshold set by the overvoltage protection circuit, so as to avoid accidents and losses, and the safety is high. In addition, the charging control circuit has a simple structure, does not need to occupy too many communication ports, has low material costs, and is suitable for promotion in mid- and low-end products. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0041] Figure 1 The figure shows a principle block diagram of an embodiment of a charging control circuit of a sweeping machine of the present application.

[0042] Figure 2 Shown is a principle block diagram of another embodiment of the charging control circuit of the sweeping machine of the present application.

[0043] Figure 3 shown Figure 2 A partial circuit diagram of the charging control circuit of the sweeping machine shown. DETAILED DESCRIPTION

[0044] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0045] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one. "Multiple" or "several" means at least two. Unless otherwise specified, words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation and are not limited to a position or a spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect.

[0046] The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0047] The present application provides a charging control circuit of a sweeping machine and a sweeping machine. The charging control circuit is electrically connected to the charging circuit of the sweeping machine, and includes a positive charging terminal, a negative charging terminal, a voltage detection circuit, an overvoltage protection circuit and a control circuit. The positive charging terminal and the negative charging terminal are respectively used to electrically connect to the positive and negative poles of a battery pack. The voltage detection circuit is electrically connected to the positive pole of the battery pack through the positive charging terminal. The voltage detection circuit detects the charging voltage of the positive pole of the battery pack. The overvoltage protection circuit is electrically connected to the voltage detection circuit; the overvoltage protection circuit provides an overvoltage protection threshold and determines whether the charging voltage is higher than the overvoltage protection threshold. The control circuit is electrically connected to the overvoltage protection circuit and the charging circuit; when the charging voltage is higher than the overvoltage protection threshold, the control circuit controls the charging circuit to disconnect from the battery pack, so that the charging circuit stops charging the battery pack.

[0048] The charging control circuit of the sweeper of the present application is provided with a voltage detection circuit, an overvoltage protection circuit and a control circuit, the voltage detection circuit is electrically connected to the positive electrode of the battery pack through the positive charging terminal, the voltage detection circuit is used to detect the charging voltage of the positive electrode of the battery pack, the overvoltage protection circuit is electrically connected to the voltage detection circuit, the overvoltage protection circuit is used to provide an overvoltage protection threshold, and it is determined whether the charging voltage is higher than the overvoltage protection threshold, the control circuit is electrically connected to the overvoltage protection circuit and the charging circuit, and the control circuit is used to control the charging circuit to disconnect from the battery pack when the charging voltage is higher than the overvoltage protection threshold, so that the charging circuit stops charging the battery pack. With such a configuration, when the charging circuit charges the battery pack, it is ensured that the charging voltage detected by the voltage detection circuit is not higher than the overvoltage protection threshold set by the overvoltage protection circuit, so as to avoid accidents and losses, and the safety is high. In addition, the charging control circuit has a simple structure, does not need to occupy too many communication ports, has low material cost, and is suitable for promotion in mid- and low-end products.

[0049] The charging control circuit of the sweeping machine and the sweeping machine of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0050] Figure 1 FIG. 1 is a schematic block diagram of an embodiment of a charging control circuit 10 for a sweeping machine of the present application. Figure 1 As shown, the charging control circuit 10 of the sweeping machine is electrically connected to the charging circuit 20 of the sweeping machine, and the charging circuit 20 is electrically connected to the battery pack 30. The charging control circuit 10 is used to control the on-off between the charging circuit 20 and the battery pack 30. In some embodiments, when the charging control circuit 10 controls the charging circuit 20 to be connected to the battery pack 30, the charging circuit 20 charges the battery pack 30. When the charging control circuit 10 controls the charging circuit 20 to be disconnected from the battery pack 30, the charging circuit 20 stops charging the battery pack 30.

[0051] In the present application, the charging control circuit 10 includes a charging terminal 11, a voltage detection circuit 12, an overvoltage protection circuit 13 and a control circuit 14. The charging terminal 11 includes a positive charging terminal 111 and a negative charging terminal 112, which are respectively used to electrically connect to the positive electrode BAT+ and the negative electrode BAT- of the battery pack 30. Figure 1In the illustrated embodiment, the voltage detection circuit 12 is electrically connected to the positive electrode BAT+ of the battery pack 30 via the positive charging terminal 111, and the voltage detection circuit 12 is used to detect the charging voltage of the positive electrode BAT+ of the battery pack 30. The overvoltage protection circuit 13 is electrically connected to the voltage detection circuit 12, and the overvoltage protection circuit 13 is used to provide an overvoltage protection threshold and determine whether the charging voltage is higher than the overvoltage protection threshold. The control circuit 14 is electrically connected to the overvoltage protection circuit 13 and the charging circuit 20, and the control circuit 14 is used to control the charging circuit 20 to disconnect from the battery pack 30 when the charging voltage is higher than the overvoltage protection threshold, so that the charging circuit 20 stops charging the battery pack 30. The control circuit 14 is used to control the charging circuit 20 to remain connected to the battery pack 30 when the charging voltage is lower than the overvoltage protection threshold, so that the charging circuit 20 continues to charge the battery pack 30.

[0052] In the above scheme, the charging control circuit 10 sets a voltage detection circuit 12, an overvoltage protection circuit 13 and a control circuit 14, and electrically connects the voltage detection circuit 12 to the positive electrode BAT+ of the battery pack 30 through the positive charging terminal 111, uses the voltage detection circuit 12 to detect the charging voltage of the positive electrode BAT+ of the battery pack 30, and electrically connects the overvoltage protection circuit 13 to the voltage detection circuit 12, uses the overvoltage protection circuit 13 to provide an overvoltage protection threshold, and determines whether the charging voltage is higher than the overvoltage protection threshold, and electrically connects the control circuit 14 to the overvoltage protection circuit 13 and the charging circuit 20, and uses the control circuit 14 to control the charging circuit 20 to disconnect from the battery pack 30 when the charging voltage is higher than the overvoltage protection threshold, so that the charging circuit 20 stops charging the battery pack 30. With such an arrangement, when the charging circuit 20 charges the battery pack 30, it ensures that the charging voltage detected by the voltage detection circuit 12 is not higher than the overvoltage protection threshold set by the overvoltage protection circuit 13, thereby avoiding accidents and losses. The arrangement has high safety. In addition, the charging control circuit 10 has a simple structure, does not require the setting of a specific detection chip, does not occupy too many communication ports, has a low material cost, and is suitable for promotion in mid- and low-end products.

[0053] Figure 2 Shown is a principle block diagram of another embodiment of the charging control circuit 10 of the sweeping machine of the present application. Figure 2 The embodiment shown is Figure 1 The embodiment shown is similar, the main difference is that in Figure 2In the illustrated embodiment, the charging control circuit 10 further includes an enable control circuit 15, which is electrically connected between the positive charging terminal 111 and the voltage detection circuit 12, and the control circuit 14 is electrically connected to the enable control circuit 15. The control circuit 14 controls the on-off of the voltage detection circuit 12 and the positive charging terminal 111 by controlling the on-off of the enable control circuit 15. By setting the enable control circuit 15, the on-off of the voltage detection circuit 12 is controlled by controlling the on-off of the enable control circuit 15. By turning off the voltage detection circuit 12 by enabling the control circuit 15, it is possible to avoid frequent acquisition of the voltage signal of the battery pack, which causes excessive power consumption of the battery pack, and the voltage drop of the battery pack affects the inventory and standby time, thereby realizing circuit low power consumption protection and ensuring the safety and normal use of the battery pack.

[0054] exist Figure 2 In the illustrated embodiment, the charging control circuit 10 of the sweeping machine also includes a current detection circuit 16 and an overcurrent protection circuit 17. The current detection circuit 16 is electrically connected to the negative electrode BAT- of the battery pack 30 through the negative electrode charging terminal 112. The overcurrent protection circuit 17 is electrically connected to the current detection circuit 16, and the control circuit 14 is also used to be electrically connected to the overcurrent protection circuit 17. The current detection circuit 16 is used to detect the charging current of the negative electrode BAT- of the battery pack 30, and the overcurrent protection circuit 17 is used to provide an overcurrent protection threshold and determine whether the charging current is higher than the overcurrent protection threshold. The control circuit 14 is used to control the charging circuit 20 to disconnect from the battery pack 30 when the charging current is higher than the overcurrent protection threshold, so that the charging circuit 20 stops charging the battery pack 30. The control circuit 14 is used to control the charging circuit 20 to remain connected to the battery pack 30 when the charging current is lower than the overcurrent protection threshold, so that the charging circuit 20 continues to charge the battery pack 30. With such a configuration, when the charging circuit 20 charges the battery pack 30, it is ensured that the charging current detected by the overcurrent protection circuit 17 is not higher than the overcurrent protection threshold set by the overcurrent protection circuit 17, thereby avoiding accidents and losses, and providing high safety. Figure 2In the embodiment shown, the charging control circuit 10 is not only provided with a voltage detection circuit 12, but also provided with a current detection circuit 16. On the basis of ensuring that the charging voltage is not higher than the overvoltage protection threshold, it is also ensured that the charging current is not higher than the overcurrent protection threshold. This can be used as a double protection to avoid accidents and losses, and has high safety. In some other embodiments, the charging control circuit 10 can be provided with a current detection circuit 16 to ensure that the charging current detected by the overcurrent protection circuit 17 is not higher than the overcurrent protection threshold set by the overcurrent protection circuit 17, to avoid accidents and losses, and has high safety. In this embodiment, when the charging control circuit 10 controls the voltage detection circuit 12 to be disconnected by controlling the enable control circuit 15, the current detection circuit 16 is also disconnected from the negative electrode BAT- of the battery pack 30. In this way, by controlling the on and off of the enable control circuit 15, not only the on and off of the voltage detection circuit 12 can be controlled, but also the on and off of the current detection circuit 16 can be controlled. With such arrangement, when there is no need to detect voltage or current, the voltage detection circuit 12 or the current detection circuit 16 can be disconnected by controlling the enabling control circuit 15, thereby reducing power consumption, and the circuit structure is simple and the cost is low.

[0055] Figure 3 shown Figure 2 The partial circuit diagram of the charging control circuit of the sweeping machine shown in FIG. Figure 2 and Figure 3 In the illustrated embodiment, the battery pack 30 includes a plurality of battery cells 301 connected in series. The battery cells 301 may be lithium battery cells. Lithium battery cells have high energy density, high power conversion efficiency, and long service life.

[0056] exist Figure 2 and Figure 3 In the illustrated embodiment, the voltage detection circuit 12 includes a first operational amplifier 121, a first voltage divider circuit 122, and a first feedback branch 123. The first voltage divider circuit 122 is electrically connected between the positive charging terminal 111 and the ground terminal GND. The non-inverting input terminal of the first operational amplifier 121 is electrically connected to the first voltage divider node M1 of the first voltage divider circuit 122. The first feedback branch 123 is electrically connected between the inverting input terminal and the output terminal of the first operational amplifier 121. The power supply terminal of the first operational amplifier 121 is electrically connected to the DC power supply terminal VCC. The ground terminal GND of the first operational amplifier 121 is electrically connected to the ground terminal GND. The voltage detection circuit 12 detects the voltage at both ends of the battery pack 30 through the first operational amplifier, and sends the detected voltage value to the overvoltage protection circuit 13.

[0057] exist Figure 2 and Figure 3In the illustrated embodiment, the first voltage-dividing circuit 122 includes a first voltage-dividing resistor R1 and a second voltage-dividing resistor R2 connected in series, and the first voltage-dividing node M1 is located between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2. The first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 play a voltage-dividing role. In the present embodiment, the first feedback branch 123 includes a first feedback resistor R3, which is electrically connected between the inverting input terminal and the output terminal of the first operational amplifier 121. The first feedback resistor R3 plays a role in reducing the output offset voltage and improving the accuracy. In the present embodiment, the voltage detection circuit 12 also includes a first current-limiting resistor R4, a first end of the first current-limiting resistor R4 is electrically connected to the output terminal of the first operational amplifier 121, and a second end of the first current-limiting resistor R4 is electrically connected to the output terminal of the voltage detection circuit 12. The first current-limiting resistor R4 plays a current-limiting role.

[0058] exist Figure 2 and Figure 3 In the illustrated embodiment, the voltage detection circuit 12 forms a voltage follower through the first operational amplifier 121, the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, the first feedback resistor R3 and the first current-limiting resistor R4. The first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 divide the voltage of the positive electrode BAT+ of the battery pack 30 in series and input it to the non-inverting input terminal of the first operational amplifier 121, and form a voltage follower through the first operational amplifier 121 and the first feedback resistor R3, and output it to the input terminal of the overvoltage protection circuit 13 through the output terminal of the first operational amplifier 121. The output voltage of the voltage detection circuit 12 follows the input voltage of the voltage detection circuit 12 and is output to the overvoltage protection circuit 13.

[0059] exist Figure 2 and Figure 3 In the illustrated embodiment, the overvoltage protection circuit 13 includes a second operational amplifier 131 and a second voltage divider circuit 132. The second voltage divider circuit 132 is electrically connected between the DC power supply terminal VCC and the ground terminal GND. The non-inverting input terminal of the second operational amplifier 131 is electrically connected to the output terminal of the voltage detection circuit 12. The inverting input terminal of the second operational amplifier 131 is electrically connected to the second voltage divider node M2 ​​of the second voltage divider circuit 132. The power supply terminal of the second operational amplifier 131 is electrically connected to the DC power supply terminal VCC. The ground terminal GND of the second operational amplifier 131 is electrically connected to the ground terminal GND. The overvoltage protection circuit 13 detects the voltage of the battery pack 30 within a safe range.

[0060] exist Figure 2 and Figure 3In the illustrated embodiment, the second voltage divider circuit 132 includes a third voltage divider resistor R5 and a fourth voltage divider resistor R6 connected in series, the second voltage divider node M2 ​​is located between the third voltage divider resistor R5 and the fourth voltage divider resistor R6, and the second voltage divider circuit 132 provides an overvoltage protection threshold through the second voltage divider node M2. The DC power supply terminal VCC provides a 5V power supply voltage. The third voltage divider resistor R5 and the fourth voltage divider resistor R6 play a role in voltage division. Figure 2 and Figure 3 In the illustrated embodiment, the overvoltage protection circuit 13 further includes a second current limiting resistor R7 and a first diode D1, the anode of the first diode D1 is electrically connected to the output terminal of the second operational amplifier 131 through the second current limiting resistor R7, and the cathode of the first diode D1 is electrically connected to the output terminal of the overvoltage protection circuit 13. The second current limiting resistor R7 plays a current limiting role. In this embodiment, the first diode D1 can be a Schottky diode, which has the characteristics of small forward conduction voltage, large current carrying capacity, fast reverse recovery time, and high switching frequency.

[0061] exist Figure 2 and Figure 3 In the illustrated embodiment, the third voltage-dividing resistor R5 and the fourth voltage-dividing resistor R6 divide the 5V power supply voltage provided by the DC power supply terminal VCC in series as an overvoltage protection threshold, which can be a reference voltage. It is input to the inverting input terminal of the second operational amplifier 131 through the second voltage-dividing node M2. The non-inverting input terminal of the second operational amplifier 131 receives the voltage output from the voltage detection circuit 12. The second operational amplifier 131 can be a comparator, which compares the reference voltage with the voltage output by the voltage detection circuit 12, and outputs the comparison result to the control circuit 14. When the voltage of the positive electrode BAT+ of the battery pack 30 is lower than the overvoltage protection threshold, the voltage output by the output terminal of the voltage detection circuit 12 is lower than the overvoltage protection threshold, and therefore, the output terminal of the second operational amplifier 131 outputs a low level. At this time, it indicates that the voltage detection circuit 12 is within the safe detection range and the battery pack 30 will not be burned due to overvoltage charging. When the voltage of the positive electrode BAT+ of the battery pack 30 is higher than the overvoltage protection threshold, the voltage of the output terminal of the voltage detection circuit 12 is higher than the overvoltage protection threshold, so the output terminal of the second operational amplifier 131 outputs a high level. This indicates that the voltage detection circuit 12 exceeds the safety detection range, and the battery pack 30 may be burned or other accidents may occur due to overvoltage charging.

[0062] exist Figure 2 and Figure 3In the embodiment shown, the control circuit 14 includes a controller 141 and a first switch tube Q1, the first switch tube Q1 is electrically connected to the output end of the overvoltage protection circuit 13, the controller 141 includes a first detection end 1411 and a first control end 1412, the controller 141 is electrically connected to the first switch tube Q1 through the first detection end 1411, and the controller 141 is electrically connected to the charging circuit 20 through the first control end 1412. The first switch tube Q1 is controlled by the overvoltage protection circuit 13. When the controller 141 receives the protection alarm signal sent by the overvoltage protection circuit 13 and the overcurrent protection circuit 17, it cuts off the charging circuit 20 by outputting the protection alarm signal to achieve overvoltage protection and overcurrent protection of the entire battery, and enables the control circuit 15 to turn on or off the battery voltage collection end by outputting a control signal to achieve low power consumption of the circuit. In this embodiment, the control circuit can also be electrically connected to the voltage detection circuit 12 and the current detection circuit 16, and can receive the charging voltage output by the voltage detection circuit 12 and the charging current output by the current detection circuit 16. According to the acquired detection value of the charging voltage and the detection value of the charging current, reconfirmation is performed to determine whether the currently detected charging voltage and charging current are within the set range, and a secondary judgment is performed to prevent misjudgment with higher accuracy. In the present embodiment, the first switch tube Q1 includes an N-type MOS tube (MOS is the abbreviation of Metal-Oxide-SemiconductorField-Effect Transistor, MOSFET, which is a metal-oxide semiconductor field effect transistor, referred to as gold-oxide-semiconductor field effect transistor). The first electrode of the first switch tube Q1 is electrically connected to the output end of the overvoltage protection circuit 13, the second electrode of the first switch tube Q1 is electrically connected to the ground terminal GND, and the third electrode of the first switch tube Q1 is electrically connected to the first detection terminal 1411. The gate of the first switch tube Q1 is electrically connected to the output end of the overvoltage protection circuit 13, the source of the first switch tube Q1 is electrically connected to the ground terminal GND, and the drain of the first switch tube Q1 is electrically connected to the first detection terminal 1411. Figure 2 and Figure 3 In the illustrated embodiment, the control circuit 14 further includes a first bias resistor R8, which is electrically connected between the first electrode and the second electrode of the first switch tube Q1. The first bias resistor R8 mainly serves to discharge static electricity and protect the first switch tube Q1. In some other embodiments, the first switch tube Q1 includes an NPN transistor. The NPN transistor can replace the N-type MOS transistor.

[0063] exist Figure 2 and Figure 3In the illustrated embodiment, when the output terminal of the second operational amplifier 131 outputs a low level, the gate of the first switch tube Q1 is pulled down to a low level through the first bias resistor R8, and the first switch tube Q1 is in a disconnected state, with no output signal, indicating that there is no voltage overcharge risk at this time. The first detection terminal 1411 of the controller 141 cannot detect a signal, and the controller 141 keeps controlling the charging circuit 20 to be connected with the battery pack 30 through the first control terminal 1412, so that the charging circuit 20 charges the battery pack 30. When the output terminal of the second operational amplifier 131 outputs a high level, the gate of the first switch tube Q1 is set to a high level through the first diode D1, and the first switch tube Q1 is in a conducting state, and a signal is output at this time. When the first detection terminal 1411 of the controller 141 detects a low level output, it indicates that there is a voltage overcharge risk at this time, and the controller 141 controls the charging circuit 20 to be disconnected from the battery pack 30 through the first control terminal 1412, so that the charging circuit 20 stops charging the battery pack 30. In this way, the battery overvoltage protection is achieved. In this way, by setting the voltage detection circuit 12, the overvoltage protection circuit 13 and the control circuit 14, the charging voltage of the battery pack 30 can be detected in real time. When it is detected that the voltage of the positive electrode BAT+ of the battery pack 30 exceeds the overvoltage protection threshold, an alarm signal is issued and the charging circuit is cut off in time to achieve overvoltage protection of the battery, which is highly safe.

[0064] exist Figure 2 and Figure 3 In the illustrated embodiment, the enabling control circuit 15 includes a second switch tube Q2 and a third switch tube Q3. The controller 141 includes a second control terminal 1413, and the controller 141 is electrically connected to the second switch tube Q2 through the second control terminal 1413. The third switch tube Q3 is electrically connected between the positive charging terminal 111 and the voltage detection circuit 12, and is electrically connected to the second switch tube Q2. The controller 141 controls the on-off of the second switch tube Q2 and the on-off of the third switch tube Q3 through the second control terminal 1413 to control the on-off between the voltage detection circuit 12 and the positive charging terminal 111. The controller 141 controls the on-off of the third switch tube Q3 by controlling the on-off of the second switch tube Q2. The circuit structure is simple and the control method is fast. Figure 2 and Figure 3 In the illustrated embodiment, the second switch tube Q2 includes an N-type MOS tube. The gate of the N-type MOS tube has the characteristics of being turned on at a high level and being cut off at a low level. The third switch tube Q3 includes a P-type MOS tube. The gate of the P-type MOS tube has the characteristics of being turned on at a low level and being cut off at a high level. In this embodiment, the controller 141 controls the on and off of the P-type MOS tube by controlling the on and off of the N-type MOS tube, and the circuit structure is simple and the switching is accurate and fast. In some other embodiments, the second switch tube Q2 includes an NPN-type transistor. The NPN-type transistor can replace the N-type MOS tube. The third switch tube Q3 includes a PNP-type transistor. The PNP-type transistor can replace the P-type MOS tube.

[0065] exist Figure 2 and Figure 3 In the embodiment shown, the enabling control circuit 15 further includes a third current limiting resistor R9, which is electrically connected between the second control terminal 1413 and the first electrode of the second switch tube Q2. The third current limiting resistor R9 is electrically connected between the second control terminal 1413 and the gate of the second switch tube Q2 to play a current limiting role. Figure 2 and Figure 3 In the embodiment shown, the enabling control circuit 15 further includes a fourth current limiting resistor R10, which is electrically connected between the second electrode of the second switch tube Q2 and the first electrode of the third switch tube Q3. The fourth current limiting resistor R10 is electrically connected between the source electrode of the second switch tube Q2 and the gate electrode of the third switch tube Q3 to play a current limiting role. The drain electrode of the second switch tube Q2 is electrically connected to the ground terminal GND. Figure 2 and Figure 3 In the illustrated embodiment, the enabling control circuit 15 further includes a second bias resistor R11, which is electrically connected between the first electrode of the third switch tube Q3 and the second electrode of the third switch tube Q3. The second bias resistor R11 is electrically connected between the gate of the third switch tube Q3 and the source of the third switch tube Q3. The drain of the third switch tube Q3 is electrically connected to one end of the first voltage divider resistor R1 of the first voltage divider circuit 122. The second bias resistor R11 mainly plays the role of electrostatic discharge and protects the third switch tube Q3.

[0066] exist Figure 2 and Figure 3In the illustrated embodiment, the third switch tube Q3 is a switch tube that turns off the voltage sampling loop of the battery pack 30. The second bias resistor R11 is a pull-up resistor of the gate of the third switch tube Q3, and also serves as a discharge. The fourth current limiting resistor R10 and the second switch tube Q2 are connected in series between the gate of the second switch tube Q2 and the ground terminal GND. The gate of the second switch tube Q2 is electrically connected to the second control terminal 1413 of the controller 141 through the third current limiting resistor R9. The second switch tube Q2 can control the conduction and disconnection of the third switch tube Q3. The second switch tube Q2 is controlled to be turned on or off according to the enable control signal sent by the second control terminal 1413 of the controller 141. When the voltage detection of the battery pack 30 is required, the second control terminal 1413 of the controller 141 sends a high-level enable control signal, at which time the gate of the second switch tube Q2 is high, and the drain and source of the second switch tube Q2 are in a conductive state. The gate of the third switch tube Q3 is pulled down to a low level by the second switch tube Q2, and the drain and source of the third switch tube Q3 are in a conducting state. The voltage of the positive electrode BAT+ of the battery pack 30 is input to the non-inverting input terminal of the voltage detection circuit 12 after being divided in series by the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, and the voltage detection circuit 12 and the overvoltage protection circuit 13 work normally. When the voltage detection of the battery pack 30 is not required, the second control terminal 1413 of the controller 141 sends a low-level enable control signal, at which time the gate of the second switch tube Q2 is at a low level, and the drain and source of the second switch tube Q2 are in a disconnected state. The gate of the third switch tube Q3 is pulled up to a high level by the second bias resistor R11, and the drain and source of the third switch tube Q3 are in a disconnected state. The voltage of the positive electrode BAT+ of the battery pack 30 cannot be input to the non-inverting input terminal of the voltage detection circuit 12 after being divided in series by the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, and the voltage detection circuit 12 and the overvoltage protection circuit 13 have no output value. With such a configuration, the controller 141 controls the enable control circuit 15, controls the collection end of the voltage detection circuit 12, and sends an enable signal through the second control end 1413 of the controller 141 to control whether the collection signal is valid or invalid, thereby achieving low power consumption protection and avoiding excessive power consumption of the battery cell caused by frequent collection of the battery pack 30 voltage signal.

[0067] exist Figure 2 and Figure 3 In the embodiment shown, the current detection circuit 16 includes a detection resistor RS, which is electrically connected between the negative charging terminal 112 and the ground terminal GND. The detection resistor RS is used to detect the current of the negative electrode BAT- of the battery pack 30, and the circuit structure is simple and the cost is low. Figure 2 and Figure 3In the illustrated embodiment, the current detection circuit 16 also includes a third operational amplifier 161, a fifth current limiting resistor R12, a sixth current limiting resistor R13, and a second feedback resistor R14. The in-phase input terminal of the third operational amplifier 161 is electrically connected to the first end of the detection resistor RS through the fifth current limiting resistor R12, the inverting input terminal of the third operational amplifier 161 is electrically connected to the second end of the detection resistor RS through the sixth current limiting resistor R13, and the second feedback resistor R14 is electrically connected between the inverting input terminal and the output terminal of the third operational amplifier 161. The current detection circuit 16 detects the charging current of the negative electrode BAT- of the battery pack 30 through the third operational amplifier 161, and sends the detected current to the overcurrent protection circuit 17. The fifth current limiting resistor R12 and the sixth current limiting resistor R13 both play a role in current limiting. The second feedback resistor R14 plays a role in reducing the output offset voltage and improving the accuracy. Figure 2 and Figure 3 In the illustrated embodiment, the current detection circuit 16 further includes a seventh current limiting resistor R15, a first end of the seventh current limiting resistor R15 is electrically connected to the output end of the third operational amplifier 161, and a second end of the seventh current limiting resistor R15 is electrically connected to the output end of the current detection circuit 16. The seventh current limiting resistor R15 plays a current limiting role.

[0068] exist Figure 2 and Figure 3 In the illustrated embodiment, the current detection circuit 16 forms a common-phase proportional amplifier through a third operational amplifier 161, a detection resistor RS, a fifth current limiting resistor R12, a sixth current limiting resistor R13 and a second feedback resistor R14. The input and output of the common-phase proportional amplifier are in phase. One end of the detection resistor RS is electrically connected to the negative electrode BAT- of the lowest cell of the battery pack 30 and the common-phase input terminal of the third operational amplifier 161, and the other end of the detection resistor RS is electrically connected to the ground terminal GND and the inverting input terminal of the third operational amplifier 161. When the battery pack 30 is charged, the charging current will flow from the negative electrode BAT- of the battery pack 3 to the ground terminal GND. At this time, a voltage difference will be generated across the two ends of the detection resistor RS. The voltage difference is input to the common-phase input terminal of the third operational amplifier 161, and after amplification, the output terminal of the third operational amplifier 161 outputs a proportionally amplified voltage value, and outputs it to the input terminal of the overcurrent protection circuit 17.

[0069] exist Figure 2 and Figure 3In the illustrated embodiment, the overcurrent protection circuit 17 includes a fourth operational amplifier 171 and a third voltage divider circuit 172, wherein the third voltage divider circuit 172 is electrically connected between the DC power supply terminal VCC and the ground terminal GND, the non-inverting input terminal of the fourth operational amplifier 171 is electrically connected to the output terminal of the current detection circuit 16, the inverting input terminal of the fourth operational amplifier 171 is electrically connected to the third voltage divider node M3 of the third voltage divider circuit 172, the power supply terminal of the fourth operational amplifier 171 is electrically connected to the DC power supply terminal VCC, and the ground terminal GND of the fourth operational amplifier 171 is electrically connected to the ground terminal GND. The overcurrent protection circuit 17 is used to detect the charging current of the battery pack 30 within a safe range.

[0070] exist Figure 2 and Figure 3 In the illustrated embodiment, the third voltage-dividing circuit 172 includes a fifth voltage-dividing resistor R16 and a sixth voltage-dividing resistor R17 connected in series, the third voltage-dividing node M3 is located between the fifth voltage-dividing resistor R16 and the sixth voltage-dividing resistor R17, and the third voltage-dividing circuit 172 provides an overcurrent protection threshold through the third voltage-dividing node M3. The fifth voltage-dividing resistor R16 and the sixth voltage-dividing resistor R17 both play a voltage-dividing role. Figure 2 and Figure 3 In the illustrated embodiment, the overcurrent protection circuit 17 further includes an eighth current limiting resistor R18 and a second diode D2, the anode of the second diode D2 is electrically connected to the output terminal of the fourth operational amplifier 171 through the eighth current limiting resistor R18, and the cathode of the second diode D2 is electrically connected to the output terminal of the overcurrent protection circuit 17. The eighth current limiting resistor R18 plays a current limiting role. The second diode D2 can be a Schottky diode, which has the characteristics of small forward conduction voltage, large current carrying capacity, fast reverse recovery time, and high switching frequency.

[0071] exist Figure 2 and Figure 3In the illustrated embodiment, the fifth voltage-dividing resistor R16 and the sixth voltage-dividing resistor R17 divide the 5V power supply voltage provided by the DC power supply VCC in series, which can be set as the overcurrent protection threshold as the reference current and input into the inverting input terminal of the fourth operational amplifier 171. The charging current output by the current detection circuit 16 is input into the non-inverting input terminal of the fourth operational amplifier 171. The fourth operational amplifier 171 can be a comparator, which compares the reference current with the current output by the current detection circuit 16, and outputs the comparison result to the control circuit 14. When the detected charging current of the negative electrode BAT- of the battery pack 30 is lower than the overcurrent protection threshold, the current output by the output terminal of the current detection circuit 16 is lower than the overcurrent protection threshold, and therefore, the output terminal of the fourth operational amplifier 171 is at a low level. At this time, it indicates that the current detection circuit 16 is within the safety detection range and the battery pack 30 will not be burned due to overvoltage charging. When the output terminal of the fourth operational amplifier 171 outputs a low level, the gate of the first switch tube Q1 is pulled down to a low level through the first bias resistor R8, and the first switch tube Q1 is in a disconnected state, with no output signal, indicating no overcharging risk at this time. The first detection terminal 1411 of the controller 141 cannot detect a signal, and the controller 141 keeps controlling the charging circuit 20 to be connected with the battery pack 30 through the first control terminal 1412, so that the charging circuit 20 charges the battery pack 30. When the detected charging current of the negative electrode BAT- of the battery pack 30 is higher than the overcurrent protection threshold, the current output by the output terminal of the current detection circuit 16 is higher than the overcurrent protection threshold, so the output terminal of the fourth operational amplifier 171 is a high level. At this time, it means that the current detection circuit 16 exceeds the safety detection range, and the battery pack 30 may be burned or other accidents may occur due to overcurrent charging. When the output terminal of the fourth operational amplifier 171 outputs a high level, the gate of the first switch tube Q1 is set to a high level through the first diode D1, and the first switch tube Q1 is in a conducting state, and a signal is output at this time. When the first detection terminal 1411 of the controller 141 detects a low-level output, it indicates that there is a risk of current overcharging at this time. The controller 141 controls the charging circuit 20 to disconnect from the battery pack 30 through the first control terminal 1412, so that the charging circuit 20 stops charging the battery pack 30. In this way, the battery overvoltage protection is achieved. In this way, by setting the current detection circuit 16, the overcurrent protection circuit 17 and the control circuit 14, the charging current of the battery pack 30 can be detected in real time. When it is detected that the current of the negative electrode BAT- of the battery pack 30 exceeds the overcurrent protection threshold, an alarm signal is issued, and the charging circuit is cut off in time to achieve overcurrent protection of the battery, which is highly safe.

[0072] The present application also provides a sweeping machine, including a battery pack 30, a charging circuit 20 and Figures 1 to 3The charging control circuit 10 of the sweeping machine shown in the embodiment. The charging circuit 20 is electrically connected to the battery pack 30 and supplies power to the battery pack 30. The positive charging terminal 111 of the charging control circuit 10 is electrically connected to the battery pack 30 and the charging circuit 20, and the charging control circuit 10 is used to control the connection and disconnection of the charging circuit 20 and the battery pack 30. In some embodiments, when the charging control circuit 10 controls the charging circuit 20 to be connected to the battery pack 30, the charging circuit 20 charges the battery pack 30. When the charging control circuit 10 controls the charging circuit 20 to be disconnected from the battery pack 30, the charging circuit 20 stops charging the battery pack 30.

[0073] In some other embodiments, the sweeping machine may also be a vacuum cleaner. Figures 1 to 3 The charging control circuit 10 of the sweeping machine shown in the embodiment can detect and compare the voltage of the battery pack 30 through the voltage detection circuit 12 and the overvoltage protection circuit 13, and can also detect and compare the charging current of the battery pack 30 through the current detection circuit 16 and the overcurrent protection circuit 17. At the same time, it confirms whether the current battery voltage and charging current are within the set range according to the obtained voltage detection value and current detection value, and performs detection and control to achieve the protection state of the charging voltage and charging current of the battery pack 30. In this way, the circuit does not need to occupy too many port resources, and only needs to use a small number of ports, which effectively solves the problem of high management cost of the charging voltage and charging current of multiple strings of battery packs 30, and also increases the safety of the battery during use, avoiding accidents and losses. At the same time, it can effectively adjust the overvoltage and overcurrent protection thresholds according to different batteries, and it also has the advantages of low cost and low power consumption. In some other embodiments, the charging control circuit 10 of the sweeping machine can also be applied to other rechargeable sweeping machines, which is not limited in this application.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A charging control circuit of a sweeping machine, electrically connected to a charging circuit of the sweeping machine, characterized in that: include: A positive charging terminal and a negative charging terminal, respectively used to electrically connect to the positive electrode and the negative electrode of the battery pack; A voltage detection circuit is electrically connected to the positive electrode of the battery pack through the positive electrode charging terminal; the voltage detection circuit detects the charging voltage of the positive electrode of the battery pack; an overvoltage protection circuit, electrically connected to the voltage detection circuit; the overvoltage protection circuit provides an overvoltage protection threshold and determines whether the charging voltage is higher than the overvoltage protection threshold; and A control circuit, electrically connected to the overvoltage protection circuit and the charging circuit; When the charging voltage is higher than the overvoltage protection threshold, the control circuit controls the charging circuit to be disconnected from the battery pack, so that the charging circuit stops charging the battery pack; Among them, the voltage detection circuit includes a first operational amplifier, a first voltage divider circuit, and a first feedback branch, the first voltage divider circuit is electrically connected between the positive charging terminal and the ground terminal; the non-inverting input terminal of the first operational amplifier is electrically connected to the first voltage divider node of the first voltage divider circuit, the first feedback branch is electrically connected between the inverting input terminal and the output terminal of the first operational amplifier, the power supply terminal of the first operational amplifier is electrically connected to the DC power supply terminal, and the ground terminal of the first operational amplifier is electrically connected to the ground terminal; the overvoltage protection circuit includes a second operational amplifier and a second voltage divider circuit, the second voltage divider circuit is electrically connected between the DC power supply terminal and the ground terminal, the non-inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the voltage detection circuit, the inverting input terminal of the second operational amplifier is electrically connected to the second voltage divider node of the second voltage divider circuit, the power supply terminal of the second operational amplifier is electrically connected to the DC power supply terminal, and the ground terminal of the second operational amplifier is electrically connected to the ground terminal.

2. The charging control circuit according to claim 1, characterized in that: The first voltage-dividing circuit comprises a first voltage-dividing resistor and a second voltage-dividing resistor connected in series, and the first voltage-dividing node is located between the first voltage-dividing resistor and the second voltage-dividing resistor; and / or The first feedback branch comprises a first feedback resistor electrically connected between the inverting input terminal and the output terminal of the first operational amplifier; and / or The voltage detection circuit also includes a first current limiting resistor, a first end of the first current limiting resistor is electrically connected to the output end of the first operational amplifier, and a second end of the first current limiting resistor is electrically connected to the output end of the voltage detection circuit.

3. The charging control circuit according to claim 1, characterized in that: The second voltage-dividing circuit comprises a third voltage-dividing resistor and a fourth voltage-dividing resistor connected in series, the second voltage-dividing node is located between the third voltage-dividing resistor and the fourth voltage-dividing resistor, and the second voltage-dividing circuit provides the overvoltage protection threshold through the second voltage-dividing node; and / or The overvoltage protection circuit also includes a second current limiting resistor and a first diode, the anode of the first diode is electrically connected to the output end of the second operational amplifier through the second current limiting resistor, and the cathode of the first diode is electrically connected to the output end of the overvoltage protection circuit.

4. The charging control circuit according to claim 1, characterized in that: The control circuit includes a controller and a first switch tube, the first switch tube is electrically connected to the output end of the overvoltage protection circuit, the controller includes a first detection end and a first control end, the controller is electrically connected to the first switch tube through the first detection end, and the controller is electrically connected to the charging circuit through the first control end; The first electrode of the first switch tube is electrically connected to the output end of the overvoltage protection circuit, the second electrode of the first switch tube is electrically connected to the ground end, and the third electrode of the first switch tube is electrically connected to the first detection end; and / or The control circuit further includes a first bias resistor electrically connected between the first electrode and the second electrode of the first switch tube; and / or The first switch tube includes an N-type MOS tube or an NPN-type transistor.

5. The charging control circuit according to claim 1, characterized in that: The charging control circuit also includes an enable control circuit, which is electrically connected between the positive charging terminal and the voltage detection circuit. The control circuit is electrically connected to the enable control circuit. The control circuit controls the on-off of the voltage detection circuit and the positive charging terminal by controlling the on-off of the enable control circuit.

6. The charging control circuit according to claim 5, characterized in that: The enabling control circuit includes a second switch tube and a third switch tube; the control circuit includes a controller, the controller includes a second control terminal, the controller is electrically connected to the second switch tube through the second control terminal, the third switch tube is electrically connected between the positive charging terminal and the voltage detection circuit, and is electrically connected to the second switch tube; the controller controls the on-off of the second switch tube through the second control terminal, controls the on-off of the third switch tube, so as to control the on-off between the voltage detection circuit and the positive charging terminal; The enabling control circuit further includes a third current limiting resistor electrically connected between the second control terminal and the first electrode of the second switch tube; and / or The enabling control circuit further includes a fourth current limiting resistor electrically connected between the second electrode of the second switch tube and the first electrode of the third switch tube; and / or The enabling control circuit further includes a second bias resistor electrically connected between the first electrode of the third switch tube and the second electrode of the third switch tube; and / or The second switch tube includes an N-type MOS tube or an NPN-type transistor; and / or The third switch tube includes a P-type MOS tube or a PNP-type transistor.

7. The charging control circuit according to claim 1 or 5, characterized in that: The charging control circuit also includes a current detection circuit and an overcurrent protection circuit, wherein the current detection circuit is electrically connected to the negative electrode of the battery pack through the negative electrode charging terminal, the overcurrent protection circuit is electrically connected to the current detection circuit, and the control circuit is also electrically connected to the overcurrent protection circuit; wherein, The current detection circuit detects the charging current of the negative electrode of the battery pack, the overcurrent protection circuit provides an overcurrent protection threshold, and determines whether the charging current is higher than the overcurrent protection threshold. When the charging current is higher than the overcurrent protection threshold, the control circuit controls the charging circuit to disconnect from the battery pack, so that the charging circuit stops charging the battery pack.

8. The charging control circuit according to claim 7, characterized in that: The current detection circuit includes a detection resistor electrically connected between the negative charging terminal and the ground terminal; The current detection circuit further includes a third operational amplifier, a fifth current limiting resistor, a sixth current limiting resistor, and a second feedback resistor, wherein the non-inverting input terminal of the third operational amplifier is electrically connected to the first end of the detection resistor through the fifth current limiting resistor, the inverting input terminal of the third operational amplifier is electrically connected to the second end of the detection resistor through the sixth current limiting resistor, and the second feedback resistor is electrically connected between the inverting input terminal and the output terminal of the third operational amplifier; and / or The current detection circuit also includes a seventh current limiting resistor, a first end of the seventh current limiting resistor is electrically connected to the output end of the third operational amplifier, and a second end of the seventh current limiting resistor is electrically connected to the output end of the current detection circuit.

9. The charging control circuit according to claim 7, characterized in that: The overcurrent protection circuit comprises a fourth operational amplifier and a third voltage-dividing circuit, wherein the third voltage-dividing circuit is electrically connected between a DC power supply terminal and a ground terminal, a non-inverting input terminal of the fourth operational amplifier is electrically connected to an output terminal of the current detection circuit, an inverting input terminal of the fourth operational amplifier is electrically connected to a third voltage-dividing node of the third voltage-dividing circuit, a power supply terminal of the fourth operational amplifier is electrically connected to the DC power supply terminal, and a ground terminal of the fourth operational amplifier is electrically connected to a ground terminal; The third voltage-dividing circuit comprises a fifth voltage-dividing resistor and a sixth voltage-dividing resistor connected in series, the third voltage-dividing node is located between the fifth voltage-dividing resistor and the sixth voltage-dividing resistor, and the third voltage-dividing circuit provides the overcurrent protection threshold through the third voltage-dividing node; and / or The overcurrent protection circuit also includes an eighth current limiting resistor and a second diode, wherein the anode of the second diode is electrically connected to the output end of the fourth operational amplifier through the eighth current limiting resistor, and the cathode of the second diode is electrically connected to the output end of the overcurrent protection circuit.

10. A sweeping machine, characterized in that: include: Battery pack; a charging circuit, electrically connected to the battery pack and supplying power to the battery pack; and The charging control circuit of the sweeping machine as described in any one of claims 1 to 9, wherein the positive charging terminal of the charging control circuit is electrically connected to the battery pack and the charging circuit, and the charging control circuit is used to control the on-off of the charging circuit and the battery pack.

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