Solar charging protection circuit and wireless communication product

Abstract

The embodiment of the utility model discloses a solar charging protection circuit and a wireless communication product. The solar charging protection circuit comprises a battery voltage sampling module, a charging control module, a switch module and a voltage over-discharge protection module, the input end of the battery voltage sampling module is electrically connected with a battery to be charged, and the input end of the charging control module is electrically connected with the output end of the battery voltage sampling module; the output end of the charging control module is electrically connected with the switch module; the switch module is connected in series between the to-be-charged battery and the solar panel; the output end of the battery voltage sampling module is also electrically connected with the control end of the voltage over-discharge protection module; the input end of the voltage over-discharge protection module is electrically connected with a battery to be charged; and the output end of the voltage over-discharge protection module is electrically connected with a load. According to the scheme, charging protection on the to-be-charged battery and over-discharge protection on the load by the to-be-charged battery are realized.

Description

Technical Field

[0001] This utility model embodiment relates to the technical field of solar charging, and particularly relates to a solar charging protection circuit and a wireless communication product. Background Art

[0002] Solar charging is a process of converting solar energy into electrical energy using solar panels, and is widely used in various portable electronic devices, household electricity, and large-scale power supply systems. The solar charging process is not only environmentally friendly but also renewable, and is an important part of new energy technologies. When designing a solar charging system, various factors need to be considered, such as the type and efficiency of solar panels, the capacity and type of energy storage system batteries, etc. Reasonable design of the energy storage system and charging control strategy is crucial for ensuring the stable and reliable operation of the solar charging system.

[0003] Currently, during the charging process of the energy storage battery in a solar charging system, there are problems such as imperfect charging control strategies, resulting in overcharging, insufficient charging, and over-discharging of the energy storage battery. Summary of the Utility Model

[0004] This utility model provides a solar charging protection circuit and a wireless communication product to achieve charging protection and over-discharge protection for the battery to be charged.

[0005] In a first aspect, an embodiment of this utility model provides a solar charging protection circuit, and this charging circuit includes: a battery voltage sampling module, a charging control module, a switching module, and a voltage over-discharge protection module;

[0006] The input end of the battery voltage sampling module is electrically connected to the battery to be charged, and is used to detect the voltage information at both ends of the battery to be charged, and output different drive control signals according to the magnitude of the voltage information;

[0007] The input end of the charging control module is electrically connected to the output end of the battery voltage sampling module; the output end of the charging control module is electrically connected to the switching module; the switching module is connected in series between the battery to be charged and the solar panel; the charging control module is used to output different switching control signals to the switching module according to different drive control signals to control whether the solar panel charges the battery to be charged;

[0008] The output end of the battery voltage sampling module is also electrically connected to the control end of the voltage over-discharge protection module; the input end of the voltage over-discharge protection module is electrically connected to the battery to be charged; the output end of the voltage over-discharge protection module is electrically connected to the load; the voltage over-discharge protection module is used to control whether the battery to be charged discharges to the load according to different drive control signals.

[0009] Optionally, the battery voltage sampling module includes: a current sensing and amplifying unit and an operational amplifying unit;

[0010] The input end of the current sensing and amplifying unit is electrically connected to the output end of the battery to be charged; the output end of the current sensing and amplifying unit is electrically connected to the first input end of the operational amplifying unit; the power supply end of the current sensing and amplifying unit is electrically connected to the second output end of the operational amplifying unit; the output end of the operational amplifying unit is electrically connected to the input end of the charging control module and the control end of the over-discharge protection module.

[0011] Optionally, the over-discharge protection module includes an over-discharge protection control unit and an over-discharge switch control unit;

[0012] The input end of the over-discharge protection control unit is electrically connected to the output end of the battery voltage sampling module; the output end of the over-discharge protection control unit is electrically connected to the control end of the over-discharge switch control unit; the input end of the over-discharge switch control unit is electrically connected to the battery to be charged; the output end of the over-discharge switch control unit is electrically connected to the load;

[0013] The over-discharge protection control unit is configured to output different protection control signals to the over-discharge switch control unit according to different driving control signals so as to control whether the battery to be charged discharges to the load.

[0014] Optionally, the charging circuit further includes: an anti-backflow module; the anti-backflow module is connected in series between the switch module and the battery to be charged.

[0015] Optionally, the current sensing and amplifying unit includes: a current sensing chip, a first resistor, a second resistor and a first capacitor;

[0016] The input end of the current sensing chip is the input end of the current sensing and amplifying unit, and is electrically connected to the first end of the first resistor and the first end of the first capacitor; the second end of the first capacitor is electrically connected to the first end of the second resistor; the second end of the second resistor is electrically connected to one end of the battery to be charged; the second end of the first resistor is electrically connected to the other end of the battery to be charged; the output end of the current sensing chip is the output end of the current sensing and amplifying unit;

[0017] The operational amplifying unit includes: a third resistor, a fourth resistor, an operational amplifier and a second capacitor; the first end of the third resistor is the first input end of the operational amplifying unit, and is electrically connected to the output end of the current sensing chip; the second end of the third resistor is electrically connected to the first input end of the operational amplifier;

[0018] The first end of the second capacitor is the second output end of the operational amplifier unit and is electrically connected to the power supply end of the current sensing chip; the second end of the second capacitor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the second input end of the operational amplifier; the output end of the operational amplifier is the output end of the operational amplifier unit.

[0019] Optionally, the charging control module includes a first transistor, a fifth resistor, and a sixth resistor;

[0020] The first end of the fifth resistor is the input end of the charging control module and is electrically connected to the output end of the battery voltage sampling module; the second end of the fifth resistor is electrically connected to the control end of the first transistor; the first end of the first transistor is the output end of the charging control module and is electrically connected to the input end of the switching module; the second end of the first transistor is electrically connected to the first end of the sixth resistor; the second end of the sixth resistor is grounded.

[0021] Optionally, the switching module includes: a second transistor, a seventh resistor, and a third capacitor; the control end of the second transistor is electrically connected to the output end of the charging control module; the first end of the second transistor is electrically connected to the first ends of the solar panel and the seventh resistor; the second end of the second transistor is electrically connected to the battery to be charged;

[0022] The second end of the seventh resistor is electrically connected to the control end of the second transistor and the first end of the third capacitor; the second end of the third capacitor is electrically connected to the input end of the charging control module.

[0023] Optionally, the over-discharge voltage protection control unit includes: a third transistor, an eighth resistor, and a ninth resistor;

[0024] The first end of the eighth resistor is the input end of the over-discharge voltage protection control unit and is electrically connected to the output end of the battery voltage sampling module; the second end of the eighth resistor is electrically connected to the control end of the third transistor; the second end of the third transistor is electrically connected to the first end of the ninth resistor; the second end of the ninth resistor is grounded; the first end of the third transistor is the output end of the over-discharge voltage protection control unit;

[0025] The over-discharge voltage switch control unit includes: a fourth transistor, a tenth resistor, and a fourth capacitor;

[0026] The first end of the tenth resistor is the control end of the fourth capacitor and the control end of the overvoltage discharge switch control unit, and is electrically connected to the first end of the third transistor; the second end of the tenth resistor is electrically connected to the control end of the fourth transistor; the first end of the fourth capacitor is electrically connected to the first end of the eighth resistor, the first end of the fourth transistor is the input end of the overvoltage discharge switch control unit, and is electrically connected to the battery to be charged; the second end of the fourth transistor is the output end of the overvoltage discharge switch control unit, and is electrically connected to the load.

[0027] Optionally, the anti-backflow module includes: a first one-way diode and a second one-way diode;

[0028] The first end of the first one-way diode is electrically connected to the switch module; the second end of the first one-way diode is electrically connected to one end of the second one-way diode; the second end of the second one-way diode is electrically connected to the battery to be charged.

[0029] In a second aspect, an embodiment of the present invention provides a wireless communication product, which includes the solar charging protection circuit described in the first aspect above; it further includes a solar panel and a battery to be charged; the solar charging protection circuit is connected in series between the solar panel and the battery to be charged.

[0030] In the embodiment of the present invention, the battery voltage sampling module detects the voltage information at both ends of the battery to be charged, and outputs different drive control signals according to the magnitude of the voltage information; the charging control module then outputs different switch control signals to the switch module according to different drive control signals to control whether the solar panel charges the battery to be charged; at the same time, the overvoltage protection module also controls whether the battery to be charged discharges to the load according to different drive control signals, thus realizing the charging protection of the battery to be charged and the over-discharge protection of the battery to be charged to the load. Description of the Drawings

[0031] Figure 1 is a schematic structural diagram of a solar charging protection circuit provided by an embodiment of the present invention;

[0032] Figure 2 is a specific structural diagram of a solar charging protection circuit provided by an embodiment of the present invention;

[0033] Figure 3 is a circuit structural diagram of a solar charging protection circuit provided by an embodiment of the present invention. Detailed Embodiments

[0034] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present utility model and not for limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0035] Figure 1 is a schematic structural diagram of a solar charging protection circuit provided by an embodiment of the present utility model. As Figure 1 shown, the solar charging protection circuit includes: a battery voltage sampling module 10, a charging control module 20, a switch module 30, and an over-discharge protection module 40; the input end of the battery voltage sampling module 10 is electrically connected to the battery BAT to be charged, and is used to detect the voltage information at both ends of the battery BAT to be charged, and output different drive control signals according to the magnitude of the voltage information;

[0036] the output end of the battery voltage sampling module 10 is electrically connected to the input end of the charging control module 20; the output end of the charging control module 20 is electrically connected to the switch module 30; the switch module 30 is connected in series between the battery BAT to be charged and the solar panel L; the charging control module 20 is used to output different switch control signals to the switch module 30 according to different drive control signals to control whether the solar panel L charges the battery BAT to be charged;

[0037] the output end of the battery voltage sampling module 10 is also electrically connected to the control end of the over-discharge protection module 40; the input end of the over-discharge protection module 40 is electrically connected to the battery BAT to be charged; the output end of the over-discharge protection module 40 is electrically connected to the load Load; the over-discharge protection module 40 is used to control whether the battery BAT to be charged discharges to the load Load according to different drive control signals.

[0038] The specific working principle of the solar charging protection circuit in this embodiment is as follows: when the voltage information detected by the battery voltage sampling module 10 at both ends of the battery to be charged is less than the preset voltage information, a first drive control signal is output; wherein, the preset voltage information can be determined according to the power supply capacity of the actual battery BAT to be charged; the charging control module 20 then outputs a first switch control signal to the switch module 30 according to the first drive control signal, so as to control the solar panel L to charge the battery BAT to be charged; at the same time, the over-discharge protection module 40 controls the battery BAT to be charged to disconnect from discharging to the load Load according to the first drive control signal, avoiding over-discharge when the voltage of the battery to be charged is insufficient, and preventing the battery BAT to be charged from being damaged by over-discharge;

[0039] When the voltage information detected by the battery voltage sampling module 10 across the battery to be charged is greater than the preset voltage information, a second drive control signal is output; the charging control module 20 then outputs a second switch control signal to the switch module 30 according to the second drive control signal, so as to control the solar panel L to stop charging the battery to be charged BAT, avoiding overcharging of the battery to be charged; at the same time, the over-discharge protection module 40 controls the battery to be charged BAT to discharge to the load Load according to the second drive control signal; thus, this solution realizes the dual protection of charging protection for the battery to be charged BAT and over-discharge of the battery to be charged BAT to the load Load.

[0040] Optionally, on the basis of the above embodiment, each module is further refined. Figure 2 It is a schematic structural diagram of a solar charging protection circuit provided by an embodiment of the present invention; as Figure 2 shown, the battery voltage sampling module 10 includes: a current sensing and amplifying unit 11 and an operational amplifying unit 12; the input end of the current sensing and amplifying unit 11 is electrically connected to the output end of the battery to be charged BAT; the output end of the current sensing and amplifying unit 11 is electrically connected to the first input end of the operational amplifying unit 12; the power supply end of the current sensing and amplifying unit 11 is electrically connected to the second output end of the operational amplifying unit 12; the output end of the operational amplifying unit 12 is electrically connected to the input end of the charging control module 20 and the control end of the over-discharge protection module 40.

[0041] Among them, the current sensing and amplifying unit 11 converts the voltage information output across the battery to be charged BAT into current information for inductive output, and amplifies and processes the inductively output current information and outputs it to the operational amplifying unit 12. The operational amplifying unit 12 then converts the amplified current information into amplified voltage information, and compares it with the reference voltage information input at the second input end and outputs different drive signals; specifically, when the amplified voltage information is less than the reference voltage information input at the second input end (corresponding to the voltage across the battery to be charged being less than the preset voltage information), a first drive signal is output as a low-level signal to the input end of the charging control module 20 and the control end of the over-discharge protection module 40; when the amplified voltage information is greater than the reference voltage information input at the second input end (corresponding to the voltage across the battery to be charged being greater than the preset voltage information), a second drive signal is output as a high-level signal to the input end of the charging control module 20 and the control end of the over-discharge protection module 40. In some embodiments, the model of the current sensing and amplifying unit 11 can be: INA199A1DCKR; the model of the operational amplifying unit 12 can be: OPA354AIDBVR; this embodiment does not make specific limitations on this.

[0042] Optionally, in some embodiments, continue to refer to Figure 2, the overvoltage discharge protection module 40 includes an overvoltage discharge protection control unit 41 and an overvoltage discharge switch control unit 42; the input end of the overvoltage discharge protection control unit 41 is electrically connected to the output end of the battery voltage sampling module 10; the output end of the overvoltage discharge protection control unit 41 is electrically connected to the control end of the overvoltage discharge switch control unit 42; the input end of the overvoltage discharge switch control unit 42 is electrically connected to the battery BAT to be charged; the output end of the overvoltage discharge switch control unit 42 is electrically connected to the load Load.

[0043] Wherein, both the overvoltage discharge protection control unit 41 and the overvoltage discharge switch control unit 42 can be a transistor or a combination of multiple transistors; the overvoltage discharge protection control unit 41 outputs different protection control signals to the overvoltage discharge switch control unit 42 according to different drive control signals, and the overvoltage discharge switch control unit 42 thereby controls whether the battery BAT to be charged discharges to the load Load; specifically, when the overvoltage discharge protection control unit 41 outputs a first protection control signal to the overvoltage discharge switch control unit 42 according to the first drive control signal, the overvoltage discharge switch control unit 42 thereby controls the battery BAT to be charged to disconnect from discharging to the load Load; when the overvoltage discharge protection control unit 41 outputs a second protection control signal to the overvoltage discharge switch control unit 42 according to the second drive control signal, the overvoltage discharge switch control unit 42 thereby controls the battery BAT to be charged to discharge to the load Load.

[0044] Optionally, in some embodiments, continue to refer to Figure 2 , the solar charging protection circuit further includes: a backflow prevention module 50; the backflow prevention module 50 is serially connected between the switch module 30 and the battery BAT to be charged. Among them, the backflow prevention module 50 can prevent the current from flowing back to the solar panel L when there is no light, thereby damaging the solar panel L, so as to improve the reliability of the overall solar charging protection circuit.

[0045] The following will be described with a specific circuit diagram. Figure 3 is a specific circuit schematic diagram of a solar charging protection circuit provided by the present invention; as Figure 3As shown in the figure, the current sensing and amplifying unit 11 includes: a current sensing chip U1, a first resistor R1, a second resistor R2, and a first capacitor C1; the input end of the current sensing chip U1 is electrically connected to the first end of the first resistor R1 and the first end of the first capacitor C1; the second end of the first capacitor C1 is electrically connected to the first end of the second resistor R2; the second end of the second resistor R2 is electrically connected to one end of the battery BAT to be charged; the second end of the first resistor R1 is the input end of the current sensing and amplifying unit U1, and is electrically connected to the other end of the battery BAT to be charged; the output end OUT of the current sensing chip U1 is the output end of the current sensing and amplifying unit 11; wherein, the second resistor R2 and the first capacitor C1 are connected to the negative electrode end of the battery BAT to be charged and grounded; the first resistor R1 can convert the voltage at the positive electrode end of the battery BAT to be charged into a current signal and output it to the input end of the current sensing chip U1, and the current sensing chip U1 amplifies and processes the current signal and then outputs it.

[0046] The operational amplifying unit 12 includes: a third resistor R3, a fourth resistor R4, an operational amplifier U2, and a second capacitor C2; the first end of the third resistor R3 is the first input end of the operational amplifying unit 12, and is electrically connected to the output end of the current sensing chip U1; the second end of the third resistor R3 is electrically connected to the first input end of the operational amplifier U2; the first end of the second capacitor C2 is the second output end of the operational amplifying unit 12, and is electrically connected to the power supply terminal V+ of the current sensing chip U1; the second end of the second capacitor C2 is electrically connected to the first end of the fourth resistor R4; the second end of the fourth resistor R4 is electrically connected to the second input end of the operational amplifier U2; the output end of the operational amplifier U2 is the output end of the operational amplifying unit 12. Among them, the third resistor R3 can convert the current signal amplified by the current sensing chip U1 into an amplified voltage signal and output it to the first input end of the operational amplifier U2; the fourth resistor R4 divides the voltage output from the power supply terminal of the current sensing chip U1 to obtain a reference voltage and outputs it to the second input end of the operational amplifier U2, then the operational amplifier U2 outputs different drive signals according to the magnitudes of the amplified voltage signal and the reference voltage; when the amplified voltage signal is less than the magnitude of the reference voltage, the output drive signal is a low-level signal, and when the amplified voltage signal is greater than the magnitude of the reference voltage, the output drive signal is a high-level signal; the second capacitor C2 functions to stabilize the voltage output from the power supply terminal of the current sensing chip U1.

[0047] Optionally, continue to refer to Figure 3, the charging control module 20 includes a first transistor Q1, a fifth resistor R5, and a sixth resistor R6; the first end of the fifth resistor R5 is the input end of the charging control module 20 and is electrically connected to the output end of the battery voltage sampling module 10, that is, electrically connected to the output end of the operational amplifier U2 in this embodiment; the second end of the fifth resistor R5 is electrically connected to the control end of the first transistor Q1; the first end of the first transistor Q1 is the output end of the charging control module 20 and is electrically connected to the input end of the switch module 30; the second end of the first transistor Q1 is electrically connected to the first end of the sixth resistor R6; the second end of the sixth resistor R6 is grounded.

[0048] Optionally, continue to refer to Figure 3 , the switch module 30 includes: a second transistor Q2, a seventh resistor R7, and a third capacitor C3; the control end of the second transistor Q2 is electrically connected to the output end of the charging control module 20, that is, electrically connected to the first end of the first transistor Q1 in this embodiment; the first end of the second transistor Q2 is electrically connected to the solar panel L and the first end of the seventh resistor R7; the second end of the second transistor Q2 is electrically connected to the battery BAT to be charged; the second end of the seventh resistor R7 is electrically connected to the control end of the second transistor Q2 and the first end of the third capacitor C3; the second end of the third capacitor C3 is electrically connected to the input end of the charging control module 20, that is, electrically connected to the first end of the fifth resistor R5 in this embodiment.

[0049] Among them, both the first transistor Q1 and the second transistor Q2 are PMOS transistors; when the operational amplifier U2 outputs a first drive signal as a low-level signal, the first transistor Q1 conducts, then the potential of the first end of the first transistor Q1 is pulled low, and the second transistor Q2 conducts, so that the solar panel L charges the battery BATE to be charged; when the voltage of the battery BATE to be charged increases, the operational amplifier U2 outputs a first drive signal as a high-level signal. At this time, the first transistor Q1 is cut off, and the seventh resistor R7 ensures that the voltage at the control end of the second transistor Q2 is high level, then the second transistor Q2 is cut off, so that the solar panel L is disconnected from charging the battery BATE to be charged; when the second transistor Q2 works, the third capacitor C3 can play a filtering role; when the first transistor Q1 works, both the fifth resistor R5 and the sixth resistor R6 play a current-limiting role. Of course, in some embodiments, the charging control module 20 further includes a first filtering resistor and a second filtering capacitor. The first end of the first filtering resistor is electrically connected to the first end of the fifth resistor R5, and the second end of the first filtering resistor is electrically connected to the first end of the first filtering capacitor; the second end of the first filtering capacitor is grounded; when the first transistor Q1 works, the first filtering resistor and the second filtering capacitor play a filtering role.

[0050] Optionally, continue to refer to Figure 3, the over-discharge protection control unit 41 includes: a third transistor Q3, an eighth resistor R8, and a ninth resistor R9; the first end of the eighth resistor R8 is the input end of the over-discharge protection control unit 42, and is electrically connected to the output end of the battery voltage sampling module 10, that is, electrically connected to the output end of the operational amplifier U2 in this embodiment; the second end of the eighth resistor R8 is electrically connected to the control end of the third transistor Q3; the second end of the third transistor Q3 is electrically connected to the first end of the ninth resistor R9; the second end of the ninth resistor R9 is grounded; the first end of the third transistor Q3 is the output end of the over-discharge protection control unit 41;

[0051] The over-discharge switch control unit 42 includes: a fourth transistor Q4, a tenth resistor R10, and a fourth capacitor C4; the first end of the tenth resistor R10 and the second end of the fourth capacitor C4 are the control ends of the over-discharge switch control unit 42, and are electrically connected to the first end of the third transistor Q3; the second end of the tenth resistor R10 is electrically connected to the control end of the fourth transistor Q4; the first end of the fourth capacitor C4 is electrically connected to the first end of the eighth resistor R8; the first end of the fourth transistor Q4 is the input end of the over-discharge switch control unit 42, and is electrically connected to the battery to be charged BAT; the second end of the fourth transistor Q4 is the output end of the over-discharge switch control unit 42, and is electrically connected to the load Load.

[0052] Among them, the third transistor Q3 is a PMOS transistor, and the fourth transistor Q2 is an NMOS transistor; when the first driving signal output by the operational amplifier U2 is a low-level signal, the third transistor Q3 is turned on, then the first end of the third transistor Q3 is pulled low, and the fourth transistor Q4 is turned off, so as to avoid discharging the load when the battery BATE to be charged has insufficient power; since when the first driving signal output by the operational amplifier U2 is a low-level signal, at the same time the solar panel L charges the battery BATE to be charged, as the voltage of the battery BATE to be charged increases, the first driving signal output by the operational amplifier U2 is a high-level signal. At this time, the third transistor Q3 is turned off, then the first end of the third transistor Q3 remains at a high level, and the fourth transistor Q4 is turned on. At this time, the battery BATE to be charged discharges to the load;

[0053] When the third transistor Q3 is working, the eighth resistor R8 can play a current-limiting role, and the ninth resistor R9 plays a voltage-stabilizing role; when the fourth transistor Q1 is working, the fourth capacitor C4 plays a filtering role; the tenth resistor plays a current-limiting role.

[0054] Optionally, continue to refer to Figure 3, the anti-backflow module 50 includes: a first one-way diode D1 and a second one-way diode D2; a first end of the first one-way diode D1 is electrically connected to the switch module 10, which is electrically connected to the second end Q2 of the second transistor in this embodiment; a second end of the first one-way diode D1 is electrically connected to one end of the second one-way diode D2; a second end of the second one-way diode D2 is electrically connected to the battery BAT to be charged. Wherein, both the first one-way diode D1 and the second one-way diode D2 have unidirectional conductivity, so as to prevent the current from flowing back to the solar panel L when there is no light, thereby damaging the solar panel, so that the reliability of the overall solar charging protection circuit can be improved. Of course, in some embodiments, filter capacitors can be connected in parallel to both the first one-way diode D1 and the second one-way diode D2 to play a filtering role.

[0055] Based on the same inventive concept, an embodiment of the present invention also provides a wireless communication product, which includes a solar charging protection circuit; it also includes a solar panel and a battery to be charged; the solar charging protection circuit is connected in series between the solar panel and the battery to be charged; the wireless communication product can include a Bluetooth audio product, etc.; since the wireless communication product includes a solar charging protection circuit, it also has the beneficial effects of the above embodiments, which will not be elaborated here; in addition, the wireless communication product uses solar renewable energy, and as the power supply system of the wireless communication product, it can charge and store the battery to be charged in the wireless communication product at any time to maintain the normal working power consumption requirements, thereby extending its working and standby time, reducing the frequency of charging the wireless communication product with a fixed power supply, and being free from the limitations of the use environment and scenario, greatly improving the user experience.

[0056] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the inventive concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A solar charging protection circuit, characterized in that, Including: A battery voltage sampling module, a charging control module, a switching module, and an over-discharge protection module; The input end of the battery voltage sampling module is electrically connected to the battery to be charged, and is used to detect the voltage information at both ends of the battery to be charged, and output different drive control signals according to the magnitude of the voltage information; The input end of the charging control module is electrically connected to the output end of the battery voltage sampling module; the output end of the charging control module is electrically connected to the switching module; the switching module is connected in series between the battery to be charged and the solar panel; the charging control module is used to output different switching control signals to the switching module according to different drive control signals to control whether the solar panel charges the battery to be charged; The output end of the battery voltage sampling module is also electrically connected to the control end of the over-discharge protection module; the input end of the over-discharge protection module is electrically connected to the battery to be charged; the output end of the over-discharge protection module is electrically connected to the load; the over-discharge protection module is used to control whether the battery to be charged discharges to the load according to different drive control signals.

2. The solar charging protection circuit according to claim 1, wherein The battery voltage sampling module includes: a current sensing and amplifying unit and an operational amplifying unit; The input end of the current sensing and amplifying unit is electrically connected to the output end of the battery to be charged; the output end of the current sensing and amplifying unit is electrically connected to the first input end of the operational amplifying unit; the power supply end of the current sensing and amplifying unit is electrically connected to the second output end of the operational amplifying unit; the output end of the operational amplifying unit is electrically connected to the input end of the charging control module and the control end of the over-discharge protection module.

3. The solar charging protection circuit according to claim 1, characterized in that The over-discharge protection module includes an over-discharge protection control unit and an over-discharge switch control unit; The input end of the over-discharge protection control unit is electrically connected to the output end of the battery voltage sampling module; the output end of the over-discharge protection control unit is electrically connected to the control end of the over-discharge switch control unit; the input end of the over-discharge switch control unit is electrically connected to the battery to be charged; the output end of the over-discharge switch control unit is electrically connected to the load; The over-discharge protection control unit is used to output different protection control signals to the over-discharge switch control unit according to different drive control signals to control whether the battery to be charged discharges to the load.

4. The solar charging protection circuit according to claim 1, characterized in that, It further includes: An anti-backflow module; the anti-backflow module is connected in series between the switching module and the battery to be charged.

5. The solar charging protection circuit according to claim 2, wherein The current sensing and amplifying unit includes: a current sensing chip, a first resistor, a second resistor, and a first capacitor; The input end of the current sensing chip is electrically connected to the first end of the first resistor and the first end of the first capacitor; the second end of the first capacitor is electrically connected to the first end of the second resistor; the second end of the second resistor is electrically connected to one end of the battery to be charged; the second end of the first resistor is the input end of the current sensing and amplifying unit and is electrically connected to the other end of the battery to be charged; the output end of the current sensing chip is the output end of the current sensing and amplifying unit; The operational amplifying unit includes: a third resistor, a fourth resistor, an operational amplifier, and a second capacitor; The first end of the third resistor is the first input end of the operational amplifying unit and is electrically connected to the output end of the current sensing chip; the second end of the third resistor is electrically connected to the first input end of the operational amplifier; The first end of the second capacitor is the second output end of the operational amplifying unit and is electrically connected to the power supply end of the current sensing chip; the second end of the second capacitor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the second input end of the operational amplifier; the output end of the operational amplifier is the output end of the operational amplifying unit.

6. The solar charging protection circuit according to claim 1, wherein, The charging control module includes a first transistor, a fifth resistor, and a sixth resistor; The first end of the fifth resistor is the input end of the charging control module and is electrically connected to the output end of the battery voltage sampling module; the second end of the fifth resistor is electrically connected to the control end of the first transistor; the first end of the first transistor is the output end of the charging control module and is electrically connected to the input end of the switching module; the second end of the first transistor is electrically connected to the first end of the sixth resistor; the second end of the sixth resistor is grounded.

7. The solar charging protection circuit according to claim 1, characterized in that, The switching module includes: a second transistor, a seventh resistor, and a third capacitor; The control end of the second transistor is electrically connected to the output end of the charging control module; the first end of the second transistor is electrically connected to the solar panel and the first end of the seventh resistor; the second end of the second transistor is electrically connected to the battery to be charged; The second end of the seventh resistor is electrically connected to the control end of the second transistor and the first end of the third capacitor; the second end of the third capacitor is electrically connected to the input end of the charging control module.

8. The solar charging protection circuit according to claim 3, wherein, The over-discharge voltage protection control unit includes: a third transistor, an eighth resistor, and a ninth resistor; The first end of the eighth resistor is the input end of the over-discharge voltage protection control unit and is electrically connected to the output end of the battery voltage sampling module; the second end of the eighth resistor is electrically connected to the control end of the third transistor; the second end of the third transistor is electrically connected to the first end of the ninth resistor; the second end of the ninth resistor is grounded; the first end of the third transistor is the output end of the over-discharge voltage protection control unit; The over-discharge switch control unit includes: a fourth transistor, a tenth resistor, and a fourth capacitor; The first end of the tenth resistor is the control end of the fourth capacitor and the control end of the voltage over-discharge switch control unit, and is electrically connected to the first end of the third transistor; the second end of the tenth resistor is electrically connected to the control end of the fourth transistor; the first end of the fourth capacitor is electrically connected to the first end of the eighth resistor, and the first end of the fourth transistor is the input end of the voltage over-discharge switch control unit and is electrically connected to the battery to be charged; the second end of the fourth transistor is the output end of the voltage over-discharge switch control unit and is electrically connected to the load.

9. The solar charging protection circuit according to claim 4, characterized in that, The anti-backflow module includes: a first one-way diode and a second one-way diode; The first end of the first one-way diode is electrically connected to the switch module; the second end of the first one-way diode is electrically connected to one end of the second one-way diode; the second end of the second one-way diode is electrically connected to the battery to be charged.

10. A wireless communication product, characterized in that, It includes the solar charging protection circuit according to any one of claims 1-9 above; it further includes a solar panel and a battery to be charged; the solar charging protection circuit is connected in series between the solar panel and the battery to be charged.

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