Charging protection circuit and charging equipment

Abstract

The utility model provides a charging protection circuit and charging equipment, and the circuit compares the real-time voltage of a battery pack with a preset voltage threshold through a voltage comparison circuit, and outputs a first signal to a timing circuit and a control circuit when the real-time voltage reaches the preset voltage threshold. The timing circuit starts timing according to the first signal, and the control circuit controls a connection path between the power supply circuit and the charging interface to be disconnected according to the first signal. Afterwards, the voltage comparison circuit continues to compare the real-time voltage of the battery pack with a preset voltage threshold value, and when the control circuit continues to receive the first signal in the timing process of the timing circuit, it is indicated that the charging device still continues to charge the battery pack, so that the real-time voltage of the battery pack continues to increase. The control circuit controls the connection path between the power supply circuit and the input interface to be disconnected, so that the external power supply stops supplying power to the charging equipment, the charging equipment stops charging the battery pack, the battery pack is prevented from being overcharged, and the battery pack is further prevented from being damaged.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a charging protection circuit and a charging device. Background Art

[0002] A battery pack may include one or more cells. The fully charged voltage of a single cell is about 4.2V. If the overcharge protection voltage of a single cell is set to 4.2V or 4.25V, it is easy to misjudge the cell voltage due to insufficient voltage sampling accuracy, triggering the overvoltage protection in advance to stop charging the cell, which will cause the battery pack to be not fully charged. Therefore, the overcharge protection voltage of a single cell is set to a larger value, such as 4.4V, to overcome the misjudgment caused by insufficient voltage sampling accuracy.

[0003] In the related art, when a single cell of a battery pack reaches 4.2V, the battery pack sends information to the charger to stop charging. However, if the charger loses control, the charger will continue to charge the battery pack. Only when the voltage of a single cell reaches the overcharge protection voltage can the overcharge protection be triggered to disconnect the battery pack from the charger. However, at this time, the cell has been overcharged, which will damage the cell and shorten the service life of the cell. Utility Model Content

[0004] In view of this, the present application provides a charging protection circuit and a charging device, which can effectively prevent the battery pack from being overcharged and prevent damage to the battery pack.

[0005] In a first aspect, the present application provides a charging protection circuit of a charging device, the charging device comprising a power supply circuit, an input interface and a charging interface, wherein a first end of the power supply circuit is connected to the input interface, the input interface is used to connect to an external power supply, and a second end of the power supply circuit is connected to the charging interface, the charging interface is used to connect to a battery pack to charge the battery pack; the charging protection circuit comprises a voltage comparison circuit, a timing circuit and a control circuit, wherein the input end of the voltage comparison circuit is used to obtain the real-time voltage of the battery pack, the output end of the voltage comparison circuit is connected to the timing circuit and the control circuit, the voltage comparison circuit is used to obtain the real-time voltage of the battery pack, and compare the real-time voltage with a preset voltage threshold, when the real-time voltage exceeds the preset voltage threshold, the voltage comparison circuit outputs a first signal; the control circuit controls the connection path between the power supply circuit and the charging interface to be disconnected according to the first signal; the timing circuit starts timing according to the first signal; when the control circuit receives the first signal during the timing process of the timing circuit, the control circuit controls the connection path between the power supply circuit and the input interface to be disconnected.

[0006] In one embodiment, the charging protection circuit also includes a protection switch circuit, which is connected between the power supply circuit and the input interface, and the control circuit controls the protection switch circuit to disconnect so as to disconnect the connection path between the power supply circuit and the input interface.

[0007] In one embodiment, the charging device also includes a main control switch circuit, which is connected between the power supply circuit and the charging interface, and the control circuit controls the main control switch circuit to disconnect so as to disconnect the connection path between the power supply circuit and the charging interface.

[0008] In one embodiment, the voltage comparison circuit includes a Zener diode and an optocoupler, the anode of the Zener diode is connected to the positive terminal of the primary side of the optocoupler, the cathode of the Zener diode is connected to the charging interface, the negative terminal of the primary side of the optocoupler is grounded, and the secondary side of the optocoupler is connected to the control circuit and the timing circuit; when the real-time voltage is greater than the preset voltage threshold, the Zener diode turns on the connection between the positive terminal of the primary side of the optocoupler and the charging interface, and the secondary side of the optocoupler sends the first signal to the control circuit and the timing circuit.

[0009] In one embodiment, the voltage comparison circuit further includes a current limiting resistor and a pull-down resistor, the cathode of the voltage regulator diode is connected to the charging interface through the current limiting resistor, and the pull-down resistor is connected in parallel between the positive terminal and the negative terminal of the primary side of the optocoupler.

[0010] In one embodiment, the battery pack includes at least two battery cell units connected in series, and the input end of the voltage comparison circuit is used to obtain the real-time voltage of each of the battery cell units to compare the real-time voltage of each of the battery cell units with the preset voltage threshold; when the real-time voltage of any one of the battery cell units reaches the preset voltage threshold, the voltage comparison circuit outputs the first signal.

[0011] In one embodiment, the preset voltage threshold is the fully charged voltage of the battery cell unit.

[0012] In one embodiment, the preset voltage threshold is the fully charged voltage of the battery pack.

[0013] The second aspect of the present application provides a charging device. The charging device includes a power supply circuit, an input interface, a charging interface, and a charging protection circuit as described above, wherein a first end of the power supply circuit is connected to the input interface, and the input interface is used to connect to an external power supply, and a second end of the power supply circuit is connected to the charging interface, and the charging interface is used to connect to a battery pack to charge the battery pack.

[0014] Compared with the prior art, this application has at least the following advantages:

[0015] In the charging protection circuit of the present application, the real-time voltage of the battery pack is compared with the preset voltage threshold through the voltage comparison circuit. When the real-time voltage reaches the preset voltage threshold, the first signal is output to the timing circuit and the control circuit. The timing circuit starts timing according to the first signal, and the control circuit controls the connection path between the power circuit and the charging interface to be disconnected according to the first signal. Then, the voltage comparison circuit continues to compare the real-time voltage of the battery pack with the preset voltage threshold. When the control circuit continues to receive the first signal during the timing process of the timing circuit, it means that the charging device is still charging the battery pack, causing the real-time voltage of the battery pack to continue to increase. The control circuit controls the connection path between the power circuit and the input interface to be disconnected, so that the external power supply stops supplying power to the charging device, ensuring that the charging device stops charging the battery pack, preventing the battery pack from being overcharged, and thus preventing damage to the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic block diagram of a charging device in the related art.

[0017] Figure 2 It is a schematic block diagram of a charging device with a charging protection circuit provided in an embodiment of the present application.

[0018] Figure 3 It is a schematic block diagram of a charging device with a charging protection circuit provided in another embodiment of the present application.

[0019] Figure 4 Schematic diagram of the circuit structure of the charging protection circuit provided in the embodiment of the present application.

[0020] Figure 5 It is a circuit structure diagram of a charging protection circuit and a battery pack provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application. In the absence of conflict, the following different embodiments and features in the embodiments can be combined with each other.

[0022] It should be noted that when a device is referred to as being “connected to” another device, it may be directly connected to the other device or may be indirectly connected (with an intervening device).

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0024] See also Figure 1 , Figure 1 1 is a schematic block diagram of a charging device 100 provided in an embodiment of the present application, wherein the charging device 100 includes a power supply circuit 101 , an input interface 102 and a charging interface 103 .

[0025] A first end of the power circuit 101 is connected to an input interface 102 , and the input interface 102 is used to be connected to an external power source 200 so that the external power source 200 supplies power to the power circuit 101 .

[0026] The second end of the power circuit 101 is connected to the charging interface 103, which is used to connect to the battery pack 300. The power circuit 101 is used to convert the voltage provided by the external power source 200 and output it to the charging interface 103 to charge the battery pack 300.

[0027] The battery pack 300 may be provided with a connection interface corresponding to the charging interface 103, and the charging interface 103 is connected to the connection interface to connect the battery pack 300 to the charging device 100. In the embodiment of the present application, the charging device 100 may include, for example, a charger, a generator, a charging pile, and the like.

[0028] In some embodiments, the charging device 100 may further include a main control switch circuit 104 (eg Figure 3 As shown in FIG. 1 , the main control switch circuit 104 is connected between the power circuit 101 and the charging interface 103. When the charging device 100 needs to charge the battery pack 300, the main control switch circuit 104 can be controlled to conduct the connection path between the power circuit 101 and the charging interface 103, so that the charging device 100 can output electric energy to charge the battery pack 300. When the battery pack 300 is fully charged, the main control switch circuit 104 can be controlled to disconnect the connection path between the power circuit 101 and the charging interface 103, so that the charging device 100 stops outputting electric energy to charge the battery pack 300.

[0029] The main control switch circuit 104 may include a charging switch tube. When the battery pack 300 connected to the charging interface 103 needs to be charged, the charging switch tube is controlled to be turned on.

[0030] See also Figure 2 , Figure 2A module schematic diagram of a charging protection circuit 110 of a battery pack 300 provided in an embodiment of the present application is shown.

[0031] like Figure 2 As shown, the charging protection circuit 110 includes a voltage comparison circuit 111 , a timing circuit 112 and a control circuit 113 .

[0032] The input end of the voltage comparison circuit 111 is used to obtain the real-time voltage of the battery pack 300, and the output end of the voltage comparison circuit 111 is connected to the timing circuit 112 and the control circuit 113. The voltage comparison circuit 111 is used to obtain the real-time voltage of the battery pack 300 and compare the real-time voltage with a preset voltage threshold. When the real-time voltage exceeds the preset voltage threshold, the voltage comparison circuit 111 outputs a first signal.

[0033] It can be understood that the charging device 100 is connected to the battery pack 300 via the charging interface 103 , and the voltage comparison circuit 111 can obtain the real-time voltage of the battery pack 300 by performing voltage detection on the charging interface 103 .

[0034] In some specific examples, the charging interface 103 and the connection interface of the battery pack 300 may be provided with a charging terminal and a detection terminal, and the detection terminal of the connection interface is connected to the battery pack 300. When the connection interface of the battery pack 300 is connected to the charging interface 103, the charging terminal of the charging interface 103 is connected to the charging terminal of the connection interface, and the detection terminal of the charging interface 103 is connected to the detection terminal of the connection interface. The charging device 100 charges the battery pack 300 through the charging terminal, and the input end of the voltage comparison circuit 111 can be connected to the detection terminal to obtain the real-time voltage of the battery pack 300 through the detection terminal.

[0035] The preset voltage threshold can be set according to the full-charge voltage of the battery pack 300, that is, according to the voltage when the battery pack 300 is fully charged. The preset voltage threshold can be determined according to actual parameters of the battery pack 300, for example, it can be set to 4V, 8V, 12V, 20V, etc.

[0036] The control circuit 113 controls the connection path between the power circuit 101 and the charging interface 103 to be disconnected according to the first signal. The timing circuit 112 starts timing according to the first signal.

[0037] It can be understood that when the main control switch circuit 104 is connected between the power circuit 101 and the charging interface 103, the control circuit 113 controls the main control switch circuit 104 to be disconnected, so that the connection path between the power circuit 101 and the charging interface 103 is disconnected.

[0038] Specifically, when the main control switch circuit 104 includes a charging switch tube, the control circuit 113 controls the charging switch tube to be disconnected, thereby disconnecting the main control switch circuit 104, and further disconnecting the power circuit 101 from the charging interface 103. Among them, when the main control switch circuit 104 can be normally controlled to be disconnected by the control circuit 113, the power circuit 101 is disconnected from the charging interface 103, and the charging device 100 stops charging the battery pack 300. When the real-time voltage of the battery pack 300 reaches the preset voltage threshold, the charging stops, so that the battery pack 300 will not be overcharged. However, if the main control switch circuit 104 is out of control, although the control circuit 113 controls the main control switch circuit 104 to be disconnected, the main control switch circuit 104 is not actually disconnected, and the charging device 100 continues to charge the battery pack 300, which will cause the battery pack 300 to be overcharged and damage the cells in the battery pack 300.

[0039] When the timing circuit 112 is in the timing process, the voltage comparison circuit 111 continues to obtain the real-time voltage. If the real-time voltage obtained by the voltage comparison circuit 111 is still greater than the preset voltage threshold during the timing process, the voltage comparison circuit 111 continues to output the first signal. When the control circuit 113 receives the first signal during the timing process of the timing circuit 112, the control circuit 113 controls the connection path between the power supply circuit 101 and the input interface 102 to be disconnected.

[0040] It can be understood that the voltage comparison circuit 111 will continuously obtain the real-time voltage of the battery pack 300 and compare the real-time voltage with the preset voltage threshold, and the control circuit 113 will continuously receive the signal output by the voltage comparison circuit 111. Among them, the duration of the timing process of the timing circuit 112 can be set according to actual application requirements, such as 10ms, 20ms, 50ms, etc.

[0041] In the embodiment of the present application, the real-time voltage of the battery pack 300 is compared with a preset voltage threshold through the voltage comparison circuit 111, and when the real-time voltage exceeds the preset voltage threshold, a first signal is output to the timing circuit 112 and the control circuit 113. The timing circuit 112 starts timing according to the first signal, and the control circuit 113 controls the connection path between the power supply circuit 101 and the charging interface 103 to be disconnected according to the first signal. Then, the voltage comparison circuit 111 continues to compare the real-time voltage of the battery pack 300 with the preset voltage threshold. When the control circuit 113 continues to receive the first signal within the preset time period of the timing circuit 112, it indicates that the charging device 100 is still charging the battery pack 300, that is, the connection path between the power circuit 101 and the charging interface 103 has not been successfully disconnected, resulting in the real-time voltage of the battery pack 300 continuing to increase. The control circuit 113 controls the connection path between the power circuit 101 and the input interface 102 to be disconnected, so that the external power supply 200 stops supplying power to the charging device 100, ensuring that the charging device 100 stops charging the battery pack 300, preventing the battery pack 300 from overcharging, and further preventing damage to the battery pack 300.

[0042] In some embodiments, the timing circuit 112 may be provided with a plurality of timing periods, and the timing duration of each timing period is a preset duration. When the timing value of the timing circuit 112 in a timing period reaches the preset duration, the timing value is reset to zero, and then the next timing period is entered to start the timing again. The control circuit 113 receives the signal of the voltage comparison circuit 111 in a plurality of timing periods, and when the control circuit 113 receives the first signal in each timing period, the control power supply circuit 101 and the input interface 102 are disconnected.

[0043] See also Figure 3 In some embodiments, the charging protection circuit 110 may further include a protection switch circuit 114, which is connected between the power supply circuit 101 and the input interface 102. The control circuit 113 controls the protection switch circuit 114 to disconnect, so as to disconnect the connection path between the power supply circuit 101 and the input interface 102.

[0044] The protection switch circuit 114 may include a MOS tube or a triode, and the control circuit 113 is connected to the gate of the MOS tube or the base of the triode, and controls the on and off of the protection switch circuit 114 by controlling the on and off of the MOS tube or the triode.

[0045] Please also read Figure 4 The voltage comparison circuit 111 of the embodiment of the present application may include a voltage regulator diode D1 and an optical coupler U1.

[0046] The anode of the Zener diode D1 is connected to the positive terminal of the primary side of the optical coupler U1, the cathode of the Zener diode D1 is connected to the charging interface 103, the negative terminal of the primary side of the optical coupler U1 is grounded, and the secondary side of the optical coupler U1 is connected to the control circuit 113 and the timing circuit 112. When the real-time voltage is greater than the preset voltage threshold, the Zener diode D1 conducts the connection between the positive terminal of the primary side of the optical coupler U1 and the charging interface, and the secondary side of the optical coupler U1 sends a first signal to the control circuit 113 and the timing circuit 112.

[0047] The Zener diode D1 is a semiconductor device that has a very high resistance until the critical reverse breakdown voltage. When the reverse voltage reaches the reverse breakdown voltage, the reverse resistance of the Zener diode D1 is reduced to a very small value, and the current increases in this low resistance region while the voltage remains constant. In this way, the Zener diode D1 with the reverse breakdown voltage set to the preset voltage threshold has a very high resistance in the voltage comparison circuit when the real-time voltage does not reach the preset voltage threshold, that is, the Zener diode D1 is in a non-conducting state. When the real-time voltage reaches the preset voltage threshold, the reverse resistance of the Zener diode D1 is reduced to a very small value, and the Zener diode D1 is turned on.

[0048] The primary side of the optical coupler U1 is a light emitting diode, and the secondary side is a light receiving device (such as a photosensitive diode, a phototransistor, etc.). The positive terminal of the primary side is the anode of the light emitting diode, and the negative terminal of the primary side is the cathode of the light emitting diode. Taking the light receiving device of the secondary side as a phototransistor as an example, the collector of the phototransistor is connected to the control circuit, and the emitter of the phototransistor is grounded. In this way, when the voltage stabilizing diode D1 is turned on, the light emitting diode of the primary side of the optical coupler U1 is turned on, the phototransistor receives the light source generated by the light emitting diode and turns on, and the collector connected to the control circuit 113 is pulled down to a low level. At this time, the first signal is a low-level signal. When the real-time voltage is less than the preset voltage threshold, the voltage stabilizing diode D1 is in a high-impedance state, that is, a disconnected state, the light emitting diode of the primary side of the optical coupler U1 is disconnected, the phototransistor of the secondary side is disconnected, and the optical coupler U1 does not generate a signal to the control circuit 113.

[0049] It can be understood that when the charging interface 103 includes a detection terminal, the cathode of the voltage regulator diode D1 is connected to the detection terminal of the charging interface 103 to obtain the real-time voltage.

[0050] Furthermore, the voltage comparison circuit 111 may also include a current limiting resistor R1 and a pull-down resistor R2, the cathode of the voltage regulator diode D1 is connected to the charging interface 103 through the current limiting resistor R1, and the pull-down resistor R2 is connected in parallel between the positive terminal and the negative terminal of the primary side of the optical coupler U1.

[0051] In this embodiment, the current is limited by the current limiting resistor R1 to prevent the current from being too large and damaging the voltage zener diode D1 and the optical coupler U1. When the voltage zener diode D1 is not turned on (that is, the real-time voltage is less than the preset voltage threshold), the anode of the light-emitting diode on the primary side of the optical coupler U1 is pulled down by the pull-down resistor R2 to ensure that the light-emitting diode on the primary side of the optical coupler U1 is disconnected when the real-time voltage is less than the preset voltage threshold, thereby ensuring that the optical coupler U1 will not output the first signal when the real-time voltage is less than the preset voltage threshold.

[0052] In some embodiments, the voltage comparison circuit may further include a first diode D2 and a first resistor R3, wherein the cathode of the first diode D2 is connected to the positive terminal of the primary side of the optical coupler U1, the anode of the first diode D2 is connected to the first end of the first resistor R3, and the second end of the first resistor R3 is grounded. The first diode D2 and the first resistor R3 are used to pull down the positive terminal of the primary side of the optical coupler U1 to a low level when the real-time voltage is less than the preset voltage threshold, further ensuring that the optical coupler U1 will not output the first signal when the real-time voltage is less than the preset voltage threshold, thereby improving the stability of the optical coupler U1.

[0053] In some embodiments, the control circuit 113 may include, for example, an MCU (Microcontroller Unit) controller U2.

[0054] Of course, in some other embodiments, the control circuit 113 may also be integrated into the battery management system of the battery pack 300. Alternatively, the timing circuit 112 and the control circuit 113 may be integrated into the battery management system of the battery pack 300, which is not limited in the present embodiment.

[0055] See also Figure 5 In some embodiments, the battery pack 300 may include at least two battery cells 310 connected in series. The input end of the voltage comparison circuit 111 may be connected to each battery cell 310 through the detection terminal of the charging interface 103, so that the input end of the voltage comparison circuit 111 can obtain the real-time voltage of each battery cell 310 to compare the real-time voltage of each battery cell 310 with the preset voltage threshold.

[0056] At this time, the preset voltage threshold is the full-charge voltage of the battery cell 310, that is, it is set according to the voltage when the battery cell 310 is fully charged. The preset voltage threshold can be determined according to the actual parameters of the battery cell 310, for example, it can be set to 4.2V, etc.

[0057] The present application embodiment also provides a charging device 100 (such as Figures 2 to 5), the charging device 100 includes a power circuit 101, an input interface 102, a charging interface 103 and the charging protection circuit 110 as described above, a first end of the power circuit 101 is connected to the input interface 102, the input interface 102 is used to connect to an external power source 200, a second end of the power circuit 101 is connected to the charging interface 103, the charging interface 103 is used to connect to the battery pack 300 to charge the battery pack 300.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A charging protection circuit of a charging device, the charging device comprising a power supply circuit, an input interface and a charging interface, wherein a first end of the power supply circuit is connected to the input interface, the input interface is used to connect to an external power supply, a second end of the power supply circuit is connected to the charging interface, and the charging interface is used to connect to a battery pack to charge the battery pack; characterized in that: The charging protection circuit includes a voltage comparison circuit, a timing circuit and a control circuit, wherein: The input end of the voltage comparison circuit is used to obtain the real-time voltage of the battery pack, and the output end of the voltage comparison circuit is connected to the timing circuit and the control circuit. The voltage comparison circuit is used to obtain the real-time voltage of the battery pack and compare the real-time voltage with a preset voltage threshold. When the real-time voltage exceeds the preset voltage threshold, the voltage comparison circuit outputs a first signal; the control circuit controls the connection path between the power supply circuit and the charging interface to be disconnected according to the first signal; and the timing circuit starts timing according to the first signal; When the control circuit receives the first signal during the timing process of the timing circuit, the control circuit controls the connection path between the power circuit and the input interface to be disconnected.

2. The charging protection circuit according to claim 1, characterized in that: The charging protection circuit also includes a protection switch circuit, which is connected between the power supply circuit and the input interface. The control circuit controls the protection switch circuit to disconnect so as to disconnect the connection path between the power supply circuit and the input interface.

3. The charging protection circuit according to claim 1, characterized in that: The charging device also includes a main control switch circuit, which is connected between the power circuit and the charging interface. The control circuit controls the main control switch circuit to disconnect so as to disconnect the connection path between the power circuit and the charging interface.

4. The charging protection circuit according to any one of claims 1 to 3, characterized in that: The voltage comparison circuit includes a voltage regulator diode and an optical coupler, wherein the anode of the voltage regulator diode is connected to the positive terminal of the primary side of the optical coupler, the cathode of the voltage regulator diode is connected to the charging interface, the negative terminal of the primary side of the optical coupler is grounded, and the secondary side of the optical coupler is connected to the control circuit and the timing circuit; When the real-time voltage is greater than the preset voltage threshold, the voltage regulator diode conducts the connection between the positive terminal of the primary side of the optocoupler and the charging interface, and the secondary side of the optocoupler sends the first signal to the control circuit and the timing circuit.

5. The charging protection circuit according to claim 4, characterized in that: The voltage comparison circuit also includes a current limiting resistor and a pull-down resistor. The cathode of the voltage regulator diode is connected to the charging interface through the current limiting resistor. The pull-down resistor is connected in parallel between the positive terminal and the negative terminal of the primary side of the optical coupler.

6. The charging protection circuit according to claim 1, characterized in that: The battery pack includes at least two battery cell units connected in series, and the input end of the voltage comparison circuit is used to obtain the real-time voltage of each of the battery cell units to compare the real-time voltage of each of the battery cell units with the preset voltage threshold; when the real-time voltage of any of the battery cell units reaches the preset voltage threshold, the voltage comparison circuit outputs the first signal.

7. The charging protection circuit according to claim 6, characterized in that: The preset voltage threshold is the full-charge voltage of the battery cell unit.

8. The charging protection circuit according to claim 1, characterized in that: The preset voltage threshold is the full-charge voltage of the battery pack.

9. The charging protection circuit according to claim 1, characterized in that: The control circuit includes an MCU controller.

10. A charging device, characterized in that: The charging device includes a power supply circuit, an input interface, a charging interface and a charging protection circuit as described in any one of claims 1 to 9, wherein a first end of the power supply circuit is connected to the input interface, and the input interface is used to connect to an external power supply, and a second end of the power supply circuit is connected to the charging interface, and the charging interface is used to connect a battery pack to charge the battery pack.

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