CN218386833U

CN218386833U - Charging protection circuit, charging protection device and solar charger

Info

Publication number: CN218386833U
Application number: CN202220521002.5U
Authority: CN
Inventors: 于军
Original assignee: DLight Technology Shenzhen Co ltd
Current assignee: DLight Technology Shenzhen Co ltd
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2023-01-24
Anticipated expiration: 2032-03-09

Abstract

This application is applicable to the protection technical field that charges, and this application embodiment provides a protection circuit, charging protection device and solar charger charge, and wherein, the protection circuit that charges includes: the device comprises a voltage input interface, a direct current charging module, a sampling module and a control module. The direct current charging module is used for generating a charging voltage signal according to a signal of the voltage input interface so as to charge the battery pack, the sampling module is used for sampling the voltage and the current of the output end of the direct current charging module to obtain a voltage sampling signal and a current sampling signal, the control module is used for generating a sampling voltage change signal according to the voltage sampling signal when the current sampling signal reaches a first preset current threshold value, comparing the sampling voltage change signal with the preset voltage change threshold value, and generating an interface identification signal according to a comparison result, so that the problems that the existing battery charging system cannot identify the type of a charging interface and cannot better protect the battery pack can be solved.

Description

Charging protection circuit, charging protection device and solar charger

Technical Field

The application belongs to the technical field of charging protection, and particularly relates to a charging protection circuit, a charging protection device and a solar charger.

Background

The existing battery charging system cannot identify the type of a charging interface and cannot better protect a battery pack.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the application provides a charging protection circuit, a charging protection device and a solar charger, which can solve the problems that the existing battery charging system cannot identify the type of a charging interface and cannot better protect a battery pack.

A first aspect of an embodiment of the present application provides a charging protection circuit, which is connected to a battery pack, and includes:

a voltage input interface;

the direct current charging module is connected with the voltage input interface and used for generating a charging voltage signal according to a signal of the voltage input interface so as to charge the battery pack;

the sampling module is connected with the direct current charging module and is used for sampling the voltage and the current at the output end of the direct current charging module to obtain a voltage sampling signal and a current sampling signal;

and the control module is connected with the sampling module and used for generating a sampling voltage change signal according to the voltage sampling signal when the current sampling signal reaches a first preset current threshold value, comparing the sampling voltage change signal with a preset voltage change threshold value and generating an interface identification signal according to a comparison result.

In one embodiment, the control module is further configured to set a reference overvoltage threshold according to the interface identification signal, and output the reference overvoltage threshold to the dc charging module when the voltage value of the battery pack is greater than or equal to a preset battery pack voltage threshold, so as to control the dc charging module to stop charging the battery pack;

and adjusting the preset battery pack voltage threshold according to the reference overvoltage threshold.

In one embodiment, the control module is further configured to calculate the charging power of the dc charging module according to the voltage sampling signal and the current sampling signal when the current sampling signal reaches a second preset current threshold.

In one embodiment, further comprising:

the direct current input module is used for accessing a solar cell panel, converting a direct current signal output by the solar cell panel, generating a direct current conversion signal and outputting the direct current conversion signal to the voltage input interface;

the alternating current input module is used for accessing an alternating current power supply, converting an alternating current signal output by the alternating current power supply, generating an alternating current conversion signal and outputting the alternating current conversion signal to the voltage input interface;

the direct current charging module is used for generating the charging voltage signal from the direct current conversion signal and the alternating current conversion signal.

In one embodiment, the dc charging module includes:

the first conduction unit is respectively connected with the voltage input interface and the control module, and is used for conducting when receiving a first conduction signal sent by the control module and generating the charging voltage signal from the direct current conversion signal;

the second conduction unit is respectively connected with the voltage input interface and the control module, and is used for conducting when receiving a second conduction signal sent by the control module, and generating the charging voltage signal from the alternating current conversion signal;

the first charging interface is connected with the first conduction unit and used for outputting the charging voltage signal output by the first conduction unit so as to charge the battery pack;

and the second charging interface is connected with the second conduction unit and used for outputting the charging voltage signal output by the second conduction unit so as to charge the battery pack.

In one embodiment, the dc charging module further includes: a filtering unit; the filtering unit is connected with the voltage input interface and is used for filtering the direct current conversion signal and/or the alternating current conversion signal.

In one embodiment, the first turn-on unit includes: the control end of the first switch tube is connected with the control module and used for being switched on when the first switching-on signal is received, the first end of the first switch tube is connected with the voltage input interface, and the second end of the first switch tube is connected with the first charging interface.

In one embodiment, the filtering unit includes: a first capacitor, a second capacitor and a third capacitor; wherein,

the first end of the first capacitor is connected with the voltage input interface, the second end of the first capacitor is grounded, the first end of the second capacitor is connected with the voltage input interface, the second end of the second capacitor is grounded, the first end of the third capacitor is connected with the voltage input interface, and the second end of the third capacitor is grounded.

A second aspect of embodiments of the present application provides a charge protection device including a charge protection circuit as described in any one of the above.

A third aspect of embodiments of the present application provides a solar charger, including:

a solar panel;

the adapter is used for connecting an alternating current power supply; further comprising: a charge protection circuit as claimed in any one of the above claims;

wherein,

the solar cell panel and the adapter are connected with the charging protection circuit.

The embodiment of the application provides a protection circuit, charging protection device and solar charger charge, and wherein, the protection circuit and the battery package of charging are connected, and the protection circuit that charges includes: the device comprises a voltage input interface, a direct current charging module, a sampling module and a control module. The direct current charging module is connected with the voltage input interface and used for generating a charging voltage signal according to a signal of the voltage input interface so as to charge a battery pack, the sampling module is connected with the direct current charging module and used for sampling voltage and current at the output end of the direct current charging module to obtain a voltage sampling signal and a current sampling signal, and the control module is used for generating a sampling voltage change signal according to the voltage sampling signal when the current sampling signal reaches a first preset current threshold value, comparing the sampling voltage change signal with the preset voltage change threshold value and generating an interface identification signal according to a comparison result.

Drawings

Fig. 1 is a schematic structural diagram of a charge protection circuit according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a charge protection circuit according to another embodiment of the present application;

fig. 3 is a schematic structural diagram of a charge protection circuit according to another embodiment of the present application;

fig. 4 is a schematic structural diagram of a charging protection circuit according to an embodiment of the present application.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means one or more unless specifically limited otherwise.

At present, most of traditional African household power supply systems adopt a solar panel and a lithium battery power supply system, the power supply system directly charges a battery for the solar panel, and a power supply of the solar panel is cut off when the battery is fully charged so as to achieve the function of charging and storing energy for the battery by the solar panel.

The existing power supply system of an African family controls the on and off of the charging of the battery by the solar panel through software so as to achieve the effect of charging the battery by solar energy, the charging method is a PWM (pulse-width modulation) direct charging method, and the existing battery charging system cannot identify the type of a charging interface and cannot better protect a battery pack.

In order to solve the above technical problem, an embodiment of the present invention provides a charging protection circuit, which is connected to a battery pack 100, and as shown in fig. 1, the charging protection circuit includes: the system comprises a voltage input interface 10, a direct current charging module 20, a sampling module 30 and a control module 40.

Specifically, the dc charging module 20 is connected to the voltage input interface 10, and the dc charging module 20 is configured to generate a charging voltage signal according to a signal of the voltage input interface 10, so as to charge the battery pack 100; the sampling module 30 is connected with the direct current charging module 20, and the sampling module 30 samples the voltage and the current at the output end of the direct current charging module 20 to obtain a voltage sampling signal and a current sampling signal; the control module 40 is connected to the sampling module 30, and the control module 40 is configured to generate a sampling voltage change signal according to the voltage sampling signal when the current sampling signal reaches a first preset current threshold, compare the sampling voltage change signal with a preset voltage change threshold, and generate an interface identification signal according to a comparison result.

In this embodiment, the voltage input interface 10 is configured to receive an input signal, where the input signal may be a dc conversion signal input by an external dc power source, or may also be an ac conversion signal input by an external ac power source, where the dc conversion signal is input by the external dc power source, for example, a dc voltage output by a solar panel is converted into a low-voltage dc conversion signal suitable for the charging protection circuit, for example, 18V solar energy is converted into 12V low-voltage dc power, and then the dc conversion signal is 12V voltage. According to the same principle, the ac conversion signal may be a low-voltage ac conversion signal adapted to the charging protection circuit and converted from the ac output by the external ac power source, for example, 220V ac is converted into 18V-28V low-voltage ac, and the ac conversion signal is then 18V-28V voltage and output to the dc charging module 20.

In the present embodiment, the dc charging module 20 is configured to generate a charging voltage signal according to a signal of the voltage input interface 10 to charge the battery pack 100. Specifically, the dc charging module 20 is configured to receive the dc conversion signal and the ac conversion signal, and generate a charging voltage signal from the dc conversion signal and the ac conversion signal, so as to charge the battery pack 100.

In this embodiment, when the current sampling signal reaches the first preset current threshold, the control module 40 generates a sampling voltage variation signal according to the voltage sampling signal, compares the sampling voltage variation signal with the preset voltage variation threshold, and generates an interface identification signal according to the comparison result. Specifically, the sampling voltage variation signal is a variation range of the voltage sampling signal when the current sampling signal reaches a first preset current threshold, and then the variation range is compared with a preset voltage variation threshold to generate an interface identification signal, where the interface identification signal is used to identify whether the charging voltage signal output by the dc charging module 20 is generated by a dc conversion signal or generated by an ac conversion signal. If the dc conversion signal is generated, it can be recognized that an external dc power source, such as a solar cell panel, is charging the battery pack 100 at this time. If the ac conversion signal is generated, it can be recognized that the battery pack 100 is charged by an external ac power source, for example, 220V commercial power. Therefore, the problem that the existing battery charging system cannot identify the type of the charging interface can be solved by providing the sampling module 30 and the control module 40.

In one embodiment, the first predetermined current threshold is 300mA and the predetermined voltage variation threshold is 0.5V. Specifically, the sampling module 30 samples the current at the output end of the dc charging module 20, compares the sampling voltage variation signal with 0.5V when the current sampling signal reaches 300mA, and identifies that the external dc power supply is charging the battery pack 100 at this time when the sampling voltage variation signal is greater than or equal to 0.5V. On the contrary, when the current sampling signal reaches 300mA, the sampling voltage variation signal is compared with 0.5V, and when the sampling voltage variation signal is less than 0.5V, it is recognized that the external ac power is used to charge the battery pack 100 at this time. The problem that the type of a charging interface cannot be identified in the conventional battery charging system can be solved.

In one embodiment, the control module 40 is further configured to set a reference overvoltage threshold according to the interface identification signal, and output the reference overvoltage threshold to the dc charging module 20 when the voltage value of the battery pack 100 is greater than or equal to the preset voltage threshold of the battery pack 100, so as to control the dc charging module 20 to stop charging the battery pack 100; the preset voltage threshold of the battery pack 100 is adjusted according to the reference overvoltage threshold.

In this embodiment, the control module 40 is mainly used to control the dc charging module 20 to stop charging the battery pack 100 when the battery pack 100 is fully charged, so as to protect the battery pack 100. Specifically, when the control module 40 identifies that the external ac power supply is charging the battery pack 100 according to the interface identification signal, the voltage value of the battery is detected, and when the voltage value of the battery pack 100 is greater than or equal to the preset voltage threshold of the battery pack 100, the reference overvoltage threshold is output to the dc charging module 20 to control the dc charging module 20 to stop charging the battery pack 100, so as to protect the battery pack 100.

In one embodiment, the reference overvoltage threshold is set to 3.3V, for example, when the voltage value of the battery pack 100 is greater than or equal to the preset voltage threshold of the battery pack 100, a voltage of 3.3V is output to the dc charging module 20, and when the dc control module 40 receives the voltage of 3.3V, the switch tube in the dc control module 40 is in an off state to stop charging the battery pack 100.

In one embodiment, the control module 40 is further configured to calculate the charging power of the dc charging module 20 according to the voltage sampling signal and the current sampling signal when the current sampling signal reaches the second preset current threshold.

Specifically, in this embodiment, when the control module 40 identifies that the external dc power supply is charging the battery pack 100 according to the interface identification signal, the current sampling signal is compared with the second preset current threshold, when the current sampling signal reaches the second preset current threshold, the current sampling signal is recorded, and the maximum charging power of the external dc power supply is calculated according to the current sampling signal and the voltage sampling signal.

In one embodiment, referring to fig. 2, the charge protection circuit further includes: a dc input module 50 and an ac input module 60.

Specifically, the dc input module 50 is configured to be connected to a solar panel, convert a dc signal output by the solar panel, generate a dc conversion signal, and output the dc conversion signal to the voltage input interface 10; the ac input module 60 is configured to access an ac power source, convert an ac signal output by the ac power source, generate an ac conversion signal, and output the ac conversion signal to the voltage input interface 10; the dc charging module 20 is configured to generate a charging voltage signal from the dc conversion signal and the ac conversion signal.

In this embodiment, the charging protection circuit may support two different types of signals, i.e., a direct current signal and an alternating current signal, to be input, for example, the direct current signal is input through the direct current input module 50, the direct current input module 50 converts the direct current signal to generate a direct current conversion signal and outputs the direct current conversion signal to the voltage input interface 10, the alternating current signal is input through the alternating current input module 60, the alternating current input module 60 converts the direct current signal to generate an alternating current conversion signal and outputs the alternating current conversion signal to the voltage input interface 10, and by providing the direct current input module 50 and the alternating current input module 60, input of different types of current signals may be supported, adaptability of the charging protection circuit is improved, and application scenarios of the charging protection circuit are widened.

In one embodiment, referring to fig. 3, the dc charging module 20 includes: the first and

second conduction units

21 and 23, the first and second charging interfaces 22 and 24.

Specifically, the first conducting unit 21 is connected to the voltage input interface 10 and the control module 40, respectively, and the first conducting unit 21 is configured to conduct when receiving a first conducting signal sent by the control module 40, and generate a charging voltage signal from the dc conversion signal; the second conduction unit 23 is respectively connected with the voltage input interface 10 and the control module 40, the second conduction unit 23 is used for conducting when receiving a second conduction signal sent by the control module 40, the second conduction unit 23 generates a charging voltage signal from the alternating current conversion signal, the first charging interface 22 is connected with the first conduction unit 21, and the first charging interface 22 is used for outputting the charging voltage signal output by the first conduction unit 21 so as to charge the battery pack 100; the second charging interface 24 is connected to the second conducting unit 23, and the second charging interface 24 is configured to output a charging voltage signal output by the second conducting unit 23, so as to charge the battery pack 100.

Specifically, the first conducting unit 21 is turned on when receiving the first conducting signal sent by the control module 40, and generates the charging voltage signal from the dc conversion signal. In this embodiment, the first conducting signal is generated by the control module 40 according to the interface identification signal and the voltage condition of the battery pack 100, for example, when the control module 40 identifies that the external dc power supply is charging the battery pack 100 according to the interface identification signal and the voltage value of the battery pack 100 is greater than or equal to the preset voltage threshold of the battery pack 100, the first conducting signal is generated to control the first conducting unit 21 to be conducted, and the dc conversion signal is generated into the charging voltage signal and output to the first charging interface 22, so as to charge the battery pack 100. According to the same principle, the second conduction signal is generated by the control module 40 according to the interface identification signal and the voltage condition of the battery pack 100, for example, when the control module 40 identifies that the external ac power source is charging the battery pack 100 according to the interface identification signal, and the voltage value of the battery pack 100 is greater than or equal to the preset voltage threshold of the battery pack 100, the second conduction signal is generated, the second conduction unit 23 is controlled to be conducted, and the ac conversion signal is generated into a charging voltage signal to be output to the second charging interface 24, so as to charge the battery pack 100. Through setting up two solitary units that switch on, can make outside DC power supply and outside AC power supply charge for battery package 100 alone, each other does not influence.

In one embodiment, as shown with reference to fig. 4, the first turn-on unit 21 includes: the first inductor comprises a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first control chip U1, a first switch tube Q1, a first inductor L1 and a first diode D1.

Specifically, a first end of the first resistor R1 is connected to the voltage input interface 10, a second end of the first resistor R1 is connected in series with the second resistor R2 and then grounded, and the fourth capacitor C4 is connected in parallel with the first resistor R1. A first end of a third resistor R3 is connected to the voltage input interface 10, a second end of the third resistor R3 is connected to a fifth end of the first control chip U1, a first end of a fourth resistor R4 is connected to the voltage input interface 10, a second end of the fourth resistor R4 is connected to an eighth end of the first control chip U1, a fifth capacitor C5 is connected in parallel to the fourth resistor R4, a first end of the first switch Q1 is connected to the voltage input interface 10, a control end of the first switch Q1 is connected to a sixth end of the first control chip U1 after being connected to the fifth resistor R5 in series, two second ends of the first switch Q1 are connected to a first end of the first control chip U1, a second end of the first switch Q1 is also connected to a first end of the first inductor L1 in common with a first end of the first diode D1 after being connected to the fifth resistor R6 in series, a second end of the first diode D1 is connected to a seventh end of the first inductor U1, a sixth capacitor C6 is connected to a first end of the first diode D1 in series, a ninth capacitor C9 is connected to a ninth capacitor C9, and a ninth capacitor C9 connected to a ninth capacitor C9.

Further, a first end of the eighth resistor R8 is connected to a first end of the ninth capacitor C9, a second end of the eighth resistor R8, a first end of the tenth resistor R10, and a first end of the ninth resistor R9 are connected to the fourth end of the first control chip U1, a second end of the ninth resistor R9 is grounded, a second end of the tenth resistor R10 and a first end of the eleventh resistor R11 are connected to a first end of the eighth capacitor C8, a second end of the eighth capacitor C8 is grounded, and a second end of the eleventh capacitor C11 is connected to the control module 40 through the SET interface.

In this embodiment, referring to fig. 4, when the circuit needs to control the first conduction unit 21 to be conducted, the control module 40 outputs a first conduction signal through the SET interface, and at this time, the first control chip U1 controls the first switch tube Q1 to be conducted, and outputs a charging voltage signal through the first charging interface 22 to charge the battery pack 100.

In one embodiment, the first control chip U1 is an LM3485 chip, and specifically, the LM3485 is an efficient PFET switching regulator controller, which can be used to develop a small, low-cost switching buck regulator with a wide application range, quickly and easily. The PFET architecture also allows for low component count and ultra-low voltage drop, 100% duty cycle operation, among other things, and also has the advantage of operating efficiently under light load conditions without increasing output ripple.

In one embodiment, as shown in fig. 4, the second turn-on unit 23 includes: a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a second control chip U2, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, and a second diode D2.

Specifically, a first end of a second control chip U2 is connected to a first conducting unit 21, a second end of the second control chip U2 is connected to a 3.3V power supply, a first end of a tenth capacitor C10 is connected to a second end of the second control chip U2, a second end of the tenth capacitor C10 is grounded, a first end of a twelfth resistor R12 and a first end of a thirteenth resistor R13 are commonly connected to a PWM interface, a second end of a thirteenth resistor R13 is grounded, a second end of the twelfth resistor R12 and a first end of an eleventh capacitor C11 are commonly connected to a first end of a fourteenth resistor R14, a second end of an eleventh capacitor C11 is grounded, a second end of a fourteenth resistor R14 and a first end of a twelfth capacitor C12 are commonly connected to a third end of the second control chip U2, a second end of a twelfth capacitor C12 is grounded, a fourth end of the second control chip U2 is grounded, a fifth end of the second control chip U2 is connected to a fifth end of the second switch Q2, a fifth end of the second switch Q2 is connected to a fifteenth switch Q2, a fifteenth resistor Q2 is connected to a fifteenth switch Q3, a fifteenth resistor Q4, a fifteenth resistor Q3 is connected in series with a second switch Q3, a fifteenth switch Q4, a second switch Q3 is connected to a second switch Q4, a second switch in series connection with a second switch Q2, a fifteenth switch control module, a fifteenth switch Q3 is connected to a second switch in series connection, a charge control terminal, a fifteenth switch Q2 is connected to a second switch in series connection, a fifteenth switch in series connection, a charge control terminal of a fifteenth switch Q2, a second switch Q2 is connected to a second switch in series connection, a fifteenth switch in series connection with a second switch control terminal of a charge control module, a second switch Q16, the first end of the nineteenth resistor R19 is connected to the second charging interface 24, the second end of the twentieth resistor R20 is connected to the first end of the fifth switch tube Q5, the second end of the fifth switch tube Q5 is grounded, the control end of the fifth switch tube Q5, the first end of the thirteenth capacitor C13 and the first end of the twenty-second resistor R22 are connected to the control module 40 in common, the second end of the twenty-second resistor R22 is grounded, and the second end of the thirteenth capacitor C13 is grounded.

In this embodiment, when the circuit needs to control the second conduction unit 23 to be conducted, the control module 40 outputs a second conduction signal through the EN interface, and at this time, the second conduction signal controls the second switch tube Q2 and the third switch tube Q3 to be conducted, and outputs a charging voltage signal through the second charging interface 24 to charge the battery pack 100.

In one embodiment, the second control chip U2 employs NCX2200, specifically, NCX2200 provides a single low voltage low power comparator. The supply current of NCX2200 is very low, only 6A, ensuring an operating voltage of 1.3V at low voltage, up to 5.5V, which makes the chip very suitable for use in 3.0V and 5.0V systems.

In one embodiment, the PWM interface is configured to input a voltage control signal outputted by the control module 40, specifically, in this implementation, when the control module 40 identifies that the external dc power supply is charging the battery pack 100 according to the interface identification signal, the current sampling signal is compared with a second preset current threshold value through the second control chip U2, when the current sampling signal reaches the second preset current threshold value, the voltage sampling signal at this time is recorded, and the maximum charging power of the external dc power supply is calculated according to the voltage sampling signal and the current sampling signal at this time.

In one embodiment, referring to fig. 4, the dc charging module 20 further includes: a filtering unit 25; the filtering unit 25 is connected to the voltage input interface 10, and is configured to perform filtering processing on the dc converted signal and/or the ac converted signal.

Specifically, when the dc conversion signal is connected to the circuit, the filtering unit 25 is configured to filter noise in the dc conversion signal and output the filtered dc conversion signal, and when the ac conversion signal is connected to the circuit, the filtering unit 25 is configured to filter noise in the ac conversion signal and output the filtered ac conversion signal, and noise in the dc conversion signal and/or the filtered ac conversion signal can be filtered by setting the filtering unit 25.

In one embodiment, the first turn-on unit 21 includes: a first switching tube Q1. The control end of the first switch tube Q1 is connected to the control module 40, and is configured to be turned on when receiving the first turn-on signal, the first end of the first switch tube Q1 is connected to the voltage input interface 10, and the second end of the first switch tube Q1 is connected to the first charging interface 22.

In this embodiment, when the control module 40 identifies that the external dc power supply is charging the battery pack 100 according to the interface identification signal, and the voltage value of the battery pack 100 is greater than or equal to the preset voltage threshold of the battery pack 100, a first turn-on signal is generated to control the first switch Q1 to be turned on, and a charging voltage signal is output to the first charging interface 22 to charge the battery pack 100.

In one embodiment, as shown with reference to fig. 4, the filtering unit 25 includes: a first capacitor C1, a second capacitor C2 and a third capacitor C3.

Specifically, a first end of the first capacitor C1 is connected to the voltage input interface 10, a second end of the first capacitor C1 is connected to ground, a first end of the second capacitor C2 is connected to the voltage input interface 10, a second end of the second capacitor C2 is connected to ground, a first end of the third capacitor C3 is connected to the voltage input interface 10, and a second end of the third capacitor C3 is connected to ground.

In this embodiment, the first capacitor C1, the second capacitor C2, and the third capacitor C3 are used for filtering the dc conversion signal and/or the ac conversion signal. Noise in the dc converted signal and/or the ac converted signal can be filtered by providing the first capacitor C1, the second capacitor C2, and the third capacitor C3.

The embodiment of the application also provides a charging protection device, which comprises the charging protection circuit.

The embodiment of the present application further provides a solar charger, including: a solar panel and an adapter. The adapter is used for accessing an alternating current power supply; the solar charger further comprises: a charge protection circuit as in any above; wherein, solar cell panel and adapter all are connected with charge protection circuit.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the data shown or discussed can be coupled or directly coupled or communicatively connected to each other through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and the parts displaying data as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A charge protection circuit for connection to a battery pack, the charge protection circuit comprising:

a voltage input interface;

the direct current charging module is connected with the voltage input interface and used for generating a charging voltage signal according to the signal of the voltage input interface so as to charge the battery pack;

the sampling module is connected with the direct current charging module and used for sampling the voltage and the current of the output end of the direct current charging module to obtain a voltage sampling signal and a current sampling signal;

2. The charging protection circuit of claim 1, wherein the control module is further configured to set a reference over-voltage threshold according to the interface identification signal, and output the reference over-voltage threshold to the dc charging module when the voltage value of the battery pack is greater than or equal to a preset battery pack voltage threshold, so as to control the dc charging module to stop charging the battery pack;

3. The charging protection circuit of claim 1, wherein the control module is further configured to calculate the charging power of the dc charging module according to the voltage sampling signal and the current sampling signal when the current sampling signal reaches a second preset current threshold.

4. The charge protection circuit of claim 1, further comprising:

5. The charge protection circuit of claim 4, wherein the DC charging module comprises:

6. The charge protection circuit of claim 5, wherein the DC charging module further comprises: a filtering unit; the filtering unit is connected with the voltage input interface and is used for filtering the direct current conversion signal and/or the alternating current conversion signal.

7. The charge protection circuit of claim 5, wherein the first pass unit comprises: the control end of the first switch tube is connected with the control module and used for being switched on when the first switching-on signal is received, the first end of the first switch tube is connected with the voltage input interface, and the second end of the first switch tube is connected with the first charging interface.

8. The charge protection circuit of claim 6, wherein the filtering unit comprises: a first capacitor, a second capacitor and a third capacitor; wherein,

9. A charge protection device, characterized in that it comprises a charge protection circuit according to any one of claims 1 to 8.

10. A solar charger, comprising:

a solar panel;

the adapter is used for connecting an alternating current power supply; further comprising: the charge protection circuit according to any one of claims 1 to 8; wherein,