Charging protection circuit, cleaning device and base station

Abstract

The embodiment of the utility model discloses a charging protection circuit, a cleaning device and a base station, the charging protection circuit is provided with an input end and an output end, the charging protection circuit comprises a comparison module and a switch module, the comparison module is provided with a first sampling end, a second sampling end and a control end, the first sampling end is connected with the input end, and the second sampling end is connected with the output end; the switch module is connected between the input end and the output end, the switch module is provided with a controlled end, and the controlled end is connected with the control end. When the voltage of the input end is lower than that of the output end, the switch module is controlled to be closed to prevent the current of the output end from flowing back to the input end; the voltage drop of the switch module is relatively small, and the change amplitude of the voltage drop is relatively small, so that the output end can output stable voltage.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to a charging protection circuit, a cleaning device, and a base station. Background Art

[0002] In related technologies, cleaning devices need to be charged frequently. In some accidental situations, short circuits or power outages may occur at the charger end, which may cause the current of the battery in the cleaning device to flow back to the charger, thereby damaging the battery or the charger of the cleaning device. Summary of the Utility Model

[0003] Embodiments of this application provide a charging protection circuit, a cleaning device, and a base station, which can avoid the phenomenon of current backflow.

[0004] In a first aspect, an embodiment of this application provides a charging protection circuit. The charging protection circuit has an input end and an output end. The charging protection circuit includes a comparison module and a switching module. The comparison module has a first sampling end, a second sampling end, and a control end. The first sampling end is connected to the input end, and the second sampling end is connected to the output end. The switching module is connected between the input end and the output end. The switching module has a controlled end, and the controlled end is connected to the control end. Wherein, when the voltage at the input end is higher than the voltage at the output end, the control end of the comparison module outputs a first level, and the switching module closes when the controlled end is at the first level. When the voltage at the input end is lower than the voltage at the output end, the control end of the comparison module outputs a second level, and the switching module disconnects when the controlled end is at the second level. The first level is greater than or less than the second level.

[0005] In a second aspect, an embodiment of this application provides a cleaning device. The cleaning device includes a charging protection circuit, a charging interface, and a battery. The charging interface is connected to the input end; the battery is connected to the output end.

[0006] In a third aspect, an embodiment of this application provides a base station. The base station includes a charging protection circuit, a rectification module, and an output interface. The rectification module is connected to the input end; the output interface is connected to the output end.

[0007] Advantageous Effects: Embodiments of this application provide a charging protection circuit, a cleaning device, and a base station. By setting a comparison module to judge the voltage levels of the input end and the output end, when the voltage at the input end is higher than the voltage at the output end, the switching module is controlled to conduct to charge the battery connected to the output end. When the voltage at the input end is lower than the voltage at the output end, the switching module is controlled to close to avoid the current at the output end from flowing back to the input end. Description of the Drawings

[0008] To more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0009] Figure 1 It is a schematic block diagram of a charging protection circuit in an embodiment of the present application;

[0010] Figure 2 It is a schematic block diagram of a charging protection circuit in another embodiment of the present application;

[0011] Figure 3 It is a schematic block diagram of a charging protection circuit in yet another embodiment of the present application;

[0012] Figure 4 It is a schematic circuit diagram of a charging protection circuit in an embodiment of the present application;

[0013] Figure 5 It is a schematic circuit diagram of a charging protection circuit in another embodiment of the present application;

[0014] Figure 6 It is a schematic block diagram of a charging protection circuit in yet another embodiment of the present application;

[0015] Figure 7 It is a schematic block diagram of a charging protection circuit in still another embodiment of the present application.

[0016] Description of reference numerals: 100, charging protection circuit; 110, input terminal; 120, output terminal; 130, comparison module; 131, comparator; 132, field effect transistor controller; 133, first sampling terminal; 134, second sampling terminal; 135, control terminal; 140, switch module; 141, transistor; R4, current limiting resistor; Q2, zener diode; R1, pull-down resistor; R2, pull-up resistor; R9, first power supply resistor; R8, second power supply resistor; 160, battery; 170, protection module; 180, filtering module; 190, potential auxiliary unit; 210, charging interface; 310, rectification module; 320, output interface. Detailed implementation manners

[0017] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] As Figures 1-3As shown, in the first aspect of the embodiment of the present application, a charging protection circuit 100 is provided. The charging protection circuit 100 has an input end 110 and an output end 120. The input end 110 is the end where current is input under normal circumstances. In some embodiments, the input end 110 can be used to connect to the rectification module 310. The connection manner between the input end 110 and the rectification module 310 can be, for example, wire connection, plug connection, contact connection, elastic sheet connection, etc. The output end 120 is used to connect to the battery 160. The connection manner between the output end 120 and the battery 160 can be, for example, plug connection, contact connection, elastic sheet connection, etc. Of course, for some embodiments using AC charging, the rectification module 310 can also be omitted.

[0019] The charging protection circuit 100 includes a comparison module 130 and a switching module 140.

[0020] The comparison module 130 has a first sampling end 133, a second sampling end 134, and a control end 135. The first sampling end 133 is connected to the input end 110, and the second sampling end 134 is connected to the output end 120. The comparison module 130 can compare the voltages of the first sampling end 133 and the second sampling end 134, and according to the comparison result, output a corresponding level at the control end 135. Exemplarily, when the voltage of the input end 110 is higher than the voltage of the output end 120, the control end 135 of the comparison module 130 outputs a first level. When the voltage of the input end 110 is lower than the voltage of the output end 120, the control end 135 of the comparison module 130 outputs a second level. The first level can be greater than or less than the second level, that is, when the first level is a high level, the second level is a low level; when the first level is a low level, the second level is a high level.

[0021] The switching module 140 is connected between the input end 110 and the output end 120. The switching module 140 has a controlled end, and the controlled end is connected to the control end 135. The control end 135 can control the switching module 140 to close or open. Exemplarily, when the control end 135 of the comparison module 130 outputs a first level, the switching module 140 closes, the input end 110 and the output end 120 are connected, and the rectification module 310 can rectify the alternating current into direct current to charge the battery 160. When the control end 135 of the comparison module 130 outputs a second level, the switching module 140 opens, the input end 110 and the output end 120 are disconnected, and the current of the battery 160 is prevented from flowing back to the rectification module 310.

[0022] In the embodiment of the present application, a comparison module 130 is provided to determine the voltage levels of the input terminal 110 and the output terminal 120. When the voltage of the input terminal 110 is higher than that of the output terminal 120, the switch module 140 is controlled to conduct to charge the battery 160; when the voltage of the input terminal 110 is lower than that of the output terminal 120, the switch module 140 is controlled to close to prevent the current of the battery 160 from flowing back to the rectification module 310.

[0023] In the related art, by setting a Schottky diode between the battery and the charger, the current of the battery can be prevented from flowing back to the charger. However, there is a certain voltage drop across both ends of the Schottky diode, and this voltage drop will cause the battery not to be fully charged, resulting in a loss of a part of the battery life of the cleaning device. Moreover, this voltage drop will vary with the charging current, charging temperature, and individual differences of the Schottky diode. Since the heat generated by the voltage drop loss of the Schottky diode will further increase the surrounding temperature, and the temperature change will change the voltage drop of the Schottky diode, the voltage drop of the Schottky diode is dynamically changing and is difficult to solve by pre-increasing the output voltage of the charger.

[0024] In addition, the reverse leakage current of the Schottky diode is relatively large, and the larger the package of the Schottky diode, the larger the reverse leakage current, and the higher the temperature, the larger the reverse leakage current. In order to avoid the detected voltage being too high due to the reverse leakage current of the Schottky diode, a resistor with a smaller resistance value and a larger package needs to be selected as the discharge resistor, which further occupies the area of the PCB.

[0025] As Figures 4-5 shown, in some embodiments, the first connection end of the transistor 141 is connected to the input terminal 110, the second connection end of the transistor 141 is connected to the output terminal 120, and the controlled end of the transistor 141 is connected to the output terminal OUT of the comparator 131. The control terminal 135 of the comparison module 130 outputs a first level, and the transistor 141 is closed; the control terminal 135 of the comparison module 130 outputs a second level, and the transistor 141 is cut off. The embodiment of the present application only needs one transistor 141 to control the on-off between the input terminal and the output terminal, and the structure is relatively simple and the cost is relatively low.

[0026] Compared with the Schottky diode, the voltage drop of the transistor 141 is lower and the change range with temperature is smaller, that is, the voltage drop change of the transistor 141 is more stable, which is beneficial to the output terminal 120 to output a stable voltage, so as to make the battery 160 fully charged as much as possible. Moreover, compared with the Schottky diode, the reverse leakage current of the transistor 141 is smaller, so a resistor with a smaller package can be selected as the discharge resistor, which can reduce the space occupation and is beneficial to reducing the volume. The transistor 141 can be, for example, a field effect transistor, a MOS transistor, a bipolar transistor, etc.

[0027] In some embodiments, the switch module 140 may exemplarily be an electromagnetic switch. Compared with a Schottky diode, the electromagnetic switch has basically no voltage drop and basically no reverse leakage current. Therefore, it is more conducive to the output terminal 120 to output a stable voltage, and can further reduce the occupation of air and further reduce the volume.

[0028] As Figure 3 shown, in some embodiments, the charging protection circuit 100 further includes a potential assisting unit 190. The potential assisting unit 190 is connected to the comparison module 130 and is used to assist the control terminal 135 of the comparison module 130 to output a first level.

[0029] As Figure 4 shown, in some embodiments, the comparison module 130 includes a comparator 131. At this time, the first sampling terminal 133 is the negative input terminal IN- of the comparator 131, and the second sampling terminal 134 is the positive input terminal IN+ of the comparator 131. The model of the comparator 131 may exemplarily be LM393, LM339, etc. When the voltage of the negative input terminal IN- of the comparator 131 is higher than the voltage of the positive input terminal IN+, the output terminal OUT of the comparator 131 outputs a low level. When an abnormal situation occurs, such as the rectification module 310 is damaged or the interface is dirty, the voltage of the input terminal 110 is lower than the voltage of the output terminal 120, the voltage of the negative input terminal IN- of the comparator 131 is lower than the voltage of the positive input terminal IN+, and the output terminal OUT of the comparator 131 outputs a high level. The power supply terminal VCC of the comparator 131 is connected to the output terminal 120, and the output terminal 120 supplies power to the comparator 131.

[0030] When the voltage of the input terminal 110 is higher than the voltage of the output terminal 120, the output terminal OUT of the comparator 131 outputs a low level, and the transistor 141 is closed; when the voltage of the input terminal 110 is lower than the voltage of the output terminal 120, the output terminal OUT of the comparator 131 outputs a high level, and the transistor 141 is cut off.

[0031] Exemplarily, the transistor 141 is a PMOS transistor Q1. The drain of the PMOS transistor Q1 is connected to the input terminal 110, the source of the PMOS transistor Q1 is connected to the output terminal 120, and the gate of the PMOS transistor Q1 is connected to the output terminal OUT of the comparator 131. When the voltage of the input terminal 110 is higher than the voltage of the output terminal 120, the output terminal OUT of the comparator 131 outputs a low level, and the voltage difference between the gate and the source of the PMOS transistor Q1 is negative, and the PMOS transistor Q1 is turned on. When the voltage of the input terminal 110 is lower than the voltage of the output terminal 120, the output terminal OUT of the comparator 131 outputs a high level, and the voltage difference between the gate and the source of the PMOS transistor Q1 is zero, and the PMOS transistor Q1 is turned off.

[0032] It can be understood that the transistor 141 can also be a triode. The collector of the triode is connected to the input terminal 110, the emitter of the triode is connected to the output terminal 120, and the base of the triode is connected to the output terminal OUT of the comparator 131. At this time, it is necessary to swap the connection modes of the input terminal 110 and the output terminal 120 with the comparator 131, so that the negative input terminal IN- of the comparator 131 is connected to the output terminal 120, and the positive input terminal IN+ of the comparator 131 is connected to the input terminal 110. When the voltage of the input terminal 110 is higher than the voltage of the output terminal 120, the output terminal OUT of the comparator 131 outputs a high level and the triode conducts. When the voltage of the input terminal 110 is lower than the voltage of the output terminal 120, the output terminal OUT of the comparator 131 outputs a low level and the triode disconnects.

[0033] As Figure 4 shown, the potential assistance unit 190 includes a current-limiting resistor R4 and a voltage-regulator diode Q2.

[0034] One end of the current-limiting resistor R4 is connected to the ground terminal GND of the comparator 131, and the other end is grounded. The positive electrode of the voltage-regulator diode Q2 is connected to the ground terminal GND of the comparator 131, and the negative electrode of the voltage-regulator diode Q2 is connected to the output terminal 120. The voltage-regulator diode Q2 is used to assist the output terminal OUT of the comparator 131 to output the first level. The voltage-regulator diode Q2 is the Figure 3 diode Q2 in

[0035] Exemplarily, the breakdown voltage of the voltage-regulator diode Q2 is 15V, and the VGS(MAX) of the PMOS transistor Q1 is less than or equal to 15V. When the output terminal OUT of the comparator 131 outputs a low level, the voltage of the low level is the voltage of the output terminal 120 minus 15V, that is, the gate voltage of the PMOS transistor Q1 is the voltage of the output terminal 120 minus 15V, and the source voltage of the PMOS transistor Q1 is the voltage of the output terminal 120. Therefore, the voltage difference VGS between the gate and the source of the PMOS transistor Q1 is -15V, which further causes the drain and the source of the PMOS transistor Q1 to conduct. When the output terminal OUT of the comparator 131 outputs a high level, the voltage of the high level is equal to the voltage of the output terminal 120. Therefore, the voltage difference between the gate and the source of the PMOS transistor Q1 is 0V, which further causes the drain and the source of Q1 to be cut off, thus playing a role in protecting the battery 160 and the rectification module 310.

[0036] As Figure 4 shown, in some embodiments, the charging protection circuit 100 further includes a pull-down resistor R1 and a pull-up resistor R2.

[0037] One end of the pull-down resistor R1 is connected to the output end of the comparator 131, and the other end of the pull-down resistor R1 is connected to the controlled end of the transistor 141. The pull-down resistor R1 can keep the gate of the PMOS transistor Q1 at a low potential and can play a role in voltage division.

[0038] One end of the pull-up resistor R2 is connected to the controlled end of the transistor 141, and the other end of the pull-up resistor R2 is connected to the output end 120. The pull-up resistor R2 can keep the source of the PMOS transistor Q1 at a high potential, and the pull-up resistor R2 can also play a role in current limiting.

[0039] As Figure 4 shown, in some embodiments, the charging protection circuit 100 further includes a resistor R3, a capacitor C2, and a capacitor C3. The resistor R3 is connected between the input end 110 and the negative input terminal IN- of the comparator 131. The resistor R3 plays a role in current limiting, so that the current flowing from the input end 110 into the comparator 131 is small, improving the charging efficiency. One end of the capacitor C2 is connected to the power supply terminal VCC of the comparator 131, and the other end is grounded. The capacitor C2 is used to filter the power supply terminal VCC of the comparator 131. The capacitor C3 is connected in parallel across both ends of the zener diode Q2Q2. The capacitor C3 is used to filter the zener diode Q2Q2.

[0040] As Figure 5 shown, in some embodiments, the comparison module 130 includes a field effect transistor controller 132. At this time, the first sampling terminal 133 is the first input pin IN of the field effect transistor controller 132, and the second sampling terminal 134 is the second input pin OUT of the field effect transistor controller 132. The field effect transistor controller 132 is also a high-side OR-ing FET controller. The model of the field effect transistor controller 132 can be exemplarily LM5050.

[0041] When the voltage of the first input pin IN of the field effect transistor controller 132 is higher than the voltage of the second input pin OUT, the gate pin GATE of the field effect transistor controller 132 outputs a high level, and the transistor 141 is turned on. When the voltage of the first input pin IN of the field effect transistor controller 132 is lower than the voltage of the second input pin OUT, the gate pin GATE of the field effect transistor controller 132 outputs a high level, and the transistor 141 is turned off. The power supply pin VS of the field effect transistor controller 132 is connected to the input terminal 110 and the output terminal 120, and either the input terminal 110 or the output terminal 120 can supply power to the field effect transistor controller 132. The ground pin GND of the field effect transistor controller 132 is grounded, and the shutdown pin OFF of the field effect transistor controller 132 is grounded. The field effect transistor controller 132 is integrated with a charge pump (not shown in the figure), and the charge pump serves as the potential auxiliary unit 190, and the charge pump is used to assist the gate pin GATE of the field effect transistor controller 132 to output the first level.

[0042] The switch module 140 includes a transistor 141. The first connection end of the transistor 141 is connected to the input terminal 110, the second connection end of the transistor 141 is connected to the output terminal 120 and the second input pin OUT, and the controlled end of the transistor 141 is connected to the gate pin GATE of the field effect transistor controller 132. When the gate pin GATE of the field effect transistor controller 132 outputs a high level, the transistor 141 is turned on; when the gate pin GATE of the field effect transistor controller 132 outputs a low level, the transistor 141 is turned off.

[0043] Exemplarily, the transistor 141 is an NMOS transistor Q3. The source of the NMOS transistor Q3 is connected to the input terminal 110. The drain of the NMOS transistor Q3 is connected to the output terminal 120 and the second input pin OUT. The gate of the NMOS transistor Q3 is connected to the gate pin GATE of the field effect transistor controller 132. When the voltage of the input terminal 110 is higher than the voltage of the output terminal 120, the voltage of the first input pin IN is higher than the voltage of the second input pin OUT. The gate pin GATE of the field effect transistor controller 132 outputs a high level. Since a charge pump with a preset voltage value higher than that of the first input pin IN is integrated inside the field effect transistor controller 132, the high level is the voltage of the charge pump at this time. The preset voltage value can be 12V exemplarily. The gate voltage of the NMOS transistor Q3 is the same as the voltage of the gate pin GATE of the field effect transistor controller 132, and the source voltage of the NMOS transistor Q3 is the same as the voltage of the input terminal 110. Therefore, the voltage difference VGS between the gate and the source of the NMOS transistor Q3 is the preset voltage value (12V), and the source and the drain of the NMOS transistor Q3 are conducting. When the voltage of the input terminal 110 is lower than the voltage of the output terminal 120, the voltage of the first input pin IN is lower than the voltage of the second input pin OUT. The gate pin GATE of the field effect transistor controller 132 outputs a low level. The output voltage of the gate pin GATE of the field effect transistor controller 132 is equal to the voltage of the first input pin IN. Therefore, the voltage difference VGS between the gate and the source of the NMOS transistor Q3 is 0V, and the source and the drain of the NMOS transistor Q3 are cut off.

[0044] It can be understood that the transistor 141 can also be a triode. The collector of the triode is connected to the input terminal 110. The emitter of the triode is connected to the output terminal 120. The base of the triode is connected to the gate pin GATE of the field effect transistor controller 132. When the voltage of the input terminal 110 is higher than the voltage of the output terminal 120, the gate pin GATE of the field effect transistor controller 132 outputs a high level, and the triode conducts. When the voltage of the input terminal 110 is lower than the voltage of the output terminal 120, the gate pin GATE of the field effect transistor controller 132 outputs a low level, and the triode disconnects.

[0045] As Figure 5 shown, in some embodiments, the charging protection circuit 100 further includes a first power supply resistor R9 and a second power supply resistor R8.

[0046] One end of the first power supply resistor R9 is connected to the power supply pin VS of the field effect transistor controller 132. The other end of the first power supply resistor R9 is connected to the input terminal 110. The input terminal 110 supplies power to the field effect transistor controller 132 through the first power supply resistor R9, and the first power supply resistor R9 has a current limiting effect.

[0047] One end of the second power supply resistor R8 is connected to the power supply pin VS of the field effect transistor controller 132, and the other end of the second power supply resistor R8 is connected to the output terminal 120. The output terminal 120 supplies power to the field effect transistor controller 132 through the second power supply resistor R8, and the second power supply resistor R8 has a current limiting effect.

[0048] As Figure 5 shown, in some embodiments, the charging protection circuit 100 further includes a resistor R5, a capacitor C5, a capacitor C6, a resistor R6, a resistor R7, and a resistor R10.

[0049] Both ends of the resistor R5 are respectively connected to the input terminal 110 and the gate of the NMOS transistor Q3. The capacitor C5 is connected in parallel with the resistor R5, and the resistor R5 and the capacitor C5 form an RC filter circuit. Both ends of the capacitor C6 are connected between the power supply pin VS and the ground pin GND of the field effect transistor controller 132, and the capacitor C6 is used to filter the power supply pin VS of the field effect transistor controller 132. One end of the resistor R6 is connected to the gate of the NMOS transistor Q3, and the other end is grounded. The resistor R6 is used for ground protection. The resistor R7 is connected in series between the gate pin GATE of the field effect transistor controller 132 and the gate of the NMOS transistor Q3. The resistor R7 is used for current limiting to reduce the loss of the NMOS transistor Q3. One end of the resistor R10 is connected to the shutdown pin OFF of the field effect transistor controller 132, and the other end is grounded. The resistor R10 is used to make the shutdown pin OFF of the field effect transistor controller 132 at a low level.

[0050] As Figures 1-3 shown, in some embodiments, the charging protection circuit 100 further includes a protection module 170. The protection module 170 is connected to the input terminal 110 and is used to absorb the surge of the input terminal 110, so as to be able to play a certain protection role for the charging protection circuit 100 and the battery 160. As Figure 3 shown, the protection module 170 is a TVS tube D1. As Figure 4 shown, the protection module 170 is a TVS tube D2.

[0051] As Figures 1-3 shown, in some embodiments, the charging protection circuit 100 further includes a filtering module 180. The filtering module 180 is connected to the input terminal 110 and is used to filter out the clutter of the input terminal 110, so that the current of the input terminal 110 is more pure. As Figure 3 shown, the filtering module 180 is a capacitor C1. As Figure 4 shown, the filtering module 180 is a capacitor C4.

[0052] As Figure 6As shown in the figure, in the second aspect of the embodiments of the present application, a cleaning device 200 is provided. The cleaning device 200 can be, for example, a cleaning robot, a vacuum cleaner, a floor washer, etc. The cleaning device 200 includes a charging protection circuit 100, a charging interface 210, and a battery 160. The battery 160 can provide off-line endurance for the cleaning device 200. When the battery power is low, the battery can be charged through the charging interface 210.

[0053] The charging interface 210 is connected to the input terminal 110 of the charging protection circuit 100, and the battery 160 is connected to the output terminal 120 of the charging protection circuit 100. By setting the charging protection circuit 100 in the cleaning device 200, the reverse current of the battery 160 can be prevented, thereby protecting the battery 160 of the cleaning device 200.

[0054] As Figure 7 shown in the figure, in the third aspect of the embodiments of the present application, a base station 300 is provided. The base station 300 can be docked with the cleaning robot. When the base station 300 is docked with the cleaning robot, the base station 300 can charge the cleaning robot. In some embodiments, the base station 300 can also perform at least one of the following operations on the cleaning robot: cleaning the dust box, replenishing clean water, sucking sewage, washing the mop, and drying the mop. The base station 300 includes a charging protection circuit 100, a rectification module 310, and an output interface 320.

[0055] The rectification module 310 is connected to the input terminal 110. The rectification module 310 is used to rectify the alternating current into direct current to charge the battery 160 of the cleaning robot.

[0056] The output interface 320 is connected to the output terminal 120. The output interface 320 is used to connect to the charging interface 210 of the cleaning device 200. By setting the charging protection circuit 100 in the base station 300, the reverse current of the battery 160 can be prevented from flowing back into the base station 300, thereby protecting the battery 160 and the base station 300.

[0057] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation of the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0058] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A charging protection circuit, characterized in that: The charging protection circuit has an input terminal and an output terminal, and includes: A comparison module, comprising a first sampling terminal, a second sampling terminal and a control terminal, wherein the first sampling terminal is connected to the input terminal, and the second sampling terminal is connected to the output terminal; A switch module, connected between the input end and the output end, the switch module having a controlled end, the controlled end being connected to the control end; A filtering module, connected to the input end, and used to filter out clutter at the input end; Among them, when the voltage of the input end is higher than the voltage of the output end, the control end of the comparison module outputs a first level, and the switch module is closed when the controlled end is at the first level; when the voltage of the input end is lower than the voltage of the output end, the control end of the comparison module outputs a second level, and the switch module is disconnected when the controlled end is at the second level, and the first level is greater than or less than the second level.

2. The charging protection circuit according to claim 1, characterized in that: The switch module comprises a transistor, a first connection end of the transistor is connected to the input end, a second connection end of the transistor is connected to the output end, and a controlled end of the transistor is connected to the control end of the comparison module; Wherein, the control end of the comparison module outputs a first level, and the transistor is closed; the control end of the comparison module outputs a second level, and the transistor is cut off.

3. The charging protection circuit according to claim 1, characterized in that: The charging protection circuit also includes: A potential auxiliary unit, the potential auxiliary unit is connected to the comparison module, and is used to assist the control end of the comparison module to output the first electrical level.

4. The charging protection circuit according to claim 3, characterized in that: The comparison module includes a comparator, the first sampling end is a negative input end of the comparator, and the second sampling end is a positive input end of the comparator; The potential auxiliary unit comprises: A current limiting resistor, one end of which is connected to the ground terminal of the comparator and the other end of which is grounded; A voltage stabilizing diode, wherein the positive electrode of the voltage stabilizing diode is connected to the ground terminal of the comparator, and the negative electrode of the voltage stabilizing diode is connected to the output terminal.

5. The charging protection circuit according to claim 3, characterized in that: The comparison module includes a field effect transistor controller, the first sampling end is a first input pin of the field effect transistor controller, the second sampling end is a second input pin of the field effect transistor controller, and the control end is a gate pin of the field effect transistor controller; The field effect transistor controller is integrated with a charge pump, and the charge pump serves as the potential auxiliary unit.

6. The charging protection circuit according to claim 5, characterized in that: The charging protection circuit also includes: A first power supply resistor, one end of which is connected to the power supply pin of the field effect transistor controller, and the other end of which is connected to the input terminal; A second power supply resistor has one end connected to the power supply pin of the field effect transistor controller and the other end connected to the output end.

7. The charging protection circuit according to any one of claims 1 to 6, characterized in that: The charging protection circuit also includes: The protection module is connected to the input end and is used to absorb the surge of the input end.

8. A cleaning device, characterized in that: include: The charging protection circuit according to any one of claims 1 to 7; A charging interface connected to the input end; and A battery is connected to the output terminal.

9. A base station, characterized in that: include: The charging protection circuit according to any one of claims 1 to 7; A rectifier module connected to the input end; and An output interface is connected to the output end.

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