Intelligent charging power system

Abstract

The utility model relates to the technical field of direct current power supply, and proposes an intelligent charging power supply system, including an AC / DC module, a photovoltaic panel, a charging switching module, a first protection module, and a second protection module; the first end of the AC / DC module is used to connect to the mains, and the second end of the AC / DC module is connected to the first end of the charging switching module; the photovoltaic panel is connected to the second end of the charging switching module, and the photovoltaic panel is used to convert solar energy into electrical energy; the third end of the charging switching module is connected to the first end of the first protection module, and the second end of the first protection module is used to connect to the battery; the second end of the first protection module is connected to the second protection module; the first protection module is used for overcurrent protection, and the second protection module is used for surge protection. Through the above technical solution, the problem of poor reliability of the traditional charging power supply system in the process of charging the battery is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current power supplies, and in particular to an intelligent charging power supply system. Background Art

[0002] A charging power system is a system that provides power to various types of battery-powered devices. It usually includes one or more batteries, a charger, and an inverter that converts direct current (DC) into alternating current (AC) for use in the power grid. The main function of a charging power system is to charge the battery by receiving power from the power grid. The charger converts AC power into DC power to charge the battery. When a battery is connected to a charger, a short-term spike current may occur, resulting in a short high-current pulse caused by the difference between the battery charge and the charger charge. If this continues for a long time, it will affect the service life of the battery and may cause safety problems in severe cases. Utility Model Content

[0003] The utility model provides an intelligent charging power supply system, which solves the problem of poor reliability of the traditional charging power supply system in the process of charging the storage battery.

[0004] The technical solution of the utility model is as follows:

[0005] An intelligent charging power supply system, comprising an AC / DC module, a photovoltaic panel, a charging switching module, a first protection module and a second protection module;

[0006] The first end of the AC / DC module is used to connect to the mains, and the second end of the AC / DC module is connected to the first end of the charging switching module;

[0007] The photovoltaic panel is connected to the second end of the charging switching module, and the photovoltaic panel is used to convert solar energy into electrical energy;

[0008] The third end of the charging switching module is connected to the first end of the first protection module, and the second end of the first protection module is used to connect to the battery;

[0009] The second end of the first protection module is connected to the second protection module;

[0010] The first protection module is used for overcurrent protection, and the second protection module is used for surge protection.

[0011] Furthermore, the utility model also includes a light intensity detection module, which is connected to the fourth end of the charging switching module and is used to convert the optical signal into an electrical signal.

[0012] Furthermore, the charging switching module in the present invention includes a NOT gate U5, a NOT gate U7, a switch tube Q3 and a switch tube Q4;

[0013] The input end of the NOT gate U5 is connected to the light intensity detection module, the output end of the NOT gate U5 is connected to the control end of the switch tube Q4, the first end of the switch tube Q4 is connected to the second end of the AC / DC module, and the second end of the switch tube Q4 is connected to the first end of the first protection module;

[0014] The output end of the NOT gate U5 is connected to the input end of the NOT gate U7, the output end of the NOT gate U7 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the photovoltaic panel, and the second end of the switch tube Q3 is connected to the second end of the switch tube Q4.

[0015] Furthermore, the first protection module in the present invention includes a resistor R2, a resistor R3, a current sensor U1, a resistor R1, a variable resistor RP1, an amplifier U2 and a switch tube Q1;

[0016] The first end of the resistor R2 is connected to the third end of the charging switching module, the second end of the resistor R2 is grounded through the resistor R3, and the second end of the resistor R2 is connected to the inverting input end of the amplifier U2;

[0017] The first input end of the current sensor U1 is connected to the third end of the charging switching module, the second input end of the current sensor U1 is used to connect to the positive electrode of the battery, the output end of the current sensor U1 is connected to the first end of the variable resistor RP1 through the resistor R1, the second end of the variable resistor RP1 is grounded, and the sliding end of the variable resistor RP1 is connected to the non-inverting input end of the amplifier U2;

[0018] The output end of the amplifier U2 is connected to the control end of the switch tube Q1 , the first end of the switch tube Q1 is connected to the second input end of the current sensor U1 , and the second end of the switch tube Q1 is grounded.

[0019] Furthermore, the second protection module in the present invention includes a resistor R5, a resistor R6, a capacitor C3 and a switch tube Q2;

[0020] The first end of the resistor R5 is connected to the second end of the first protection module, the second end of the resistor R5 is grounded through the resistor R6, the second end of the resistor R5 is grounded through the capacitor C3, the second end of the resistor R5 is connected to the control end of the switch tube Q2, the first end of the switch tube Q2 is used to connect the negative electrode of the battery, and the second end of the switch tube Q2 is grounded.

[0021] Further, the light intensity detection module in the utility model includes a variable resistor RP2, a phototransistor U6, a resistor R10, an amplifier U4, a resistor R12, an optical coupler U3 and a resistor R13;

[0022] The first end of the variable resistor RP2 is connected to a 5V power supply, the second end of the variable resistor RP2 is connected to the first end of the phototransistor U6, the second end of the phototransistor U6 is grounded through the resistor R10, the second end of the phototransistor U6 is connected to the in-phase input end of the amplifier U4, the output end of the amplifier U4 is connected to the inverting input end of the amplifier U4, the output end of the amplifier U4 is connected to the first input end of the optocoupler U3 through the resistor R12, the second input end of the optocoupler U3 is grounded, the first output end of the optocoupler U3 is connected to the 5V power supply through the resistor R13, and the second output end of the optocoupler U3 is connected to the fourth end of the charging switching module.

[0023] The working principle and beneficial effects of the utility model are:

[0024] In the utility model, the intelligent charging power supply system integrates two energy inputs, namely, mains electricity and solar energy, and flexibly switches through the charging switching module to ensure that the battery can be effectively charged under different conditions. At the same time, it combines the dual safety measures of overcurrent protection and surge protection, aiming to achieve intelligent, safe and efficient charging management of the battery, protect the battery and other components of the system from damage, and solve the problem of poor reliability of the traditional charging power supply system in the process of charging the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Figure 1 It is a structural block diagram of the intelligent charging power supply system in the utility model;

[0027] Figure 2 A circuit diagram of an embodiment of the intelligent charging power supply system of the utility model;

[0028] Figure 3 This is a circuit diagram of another embodiment of the intelligent charging power supply system in the utility model. DETAILED DESCRIPTION

[0029] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0030] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment proposes an intelligent charging power supply system, including an AC / DC module, a photovoltaic panel, a charging switching module, a first protection module and a second protection module;

[0033] The first end of the AC / DC module is used to connect to the mains, and the second end of the AC / DC module is connected to the first end of the charging switching module;

[0034] The photovoltaic panel is connected to the second end of the charging switching module, and the photovoltaic panel is used to convert solar energy into electrical energy;

[0035] The third end of the charging switching module is connected to the first end of the first protection module, and the second end of the first protection module is used to connect to the battery;

[0036] The second end of the first protection module is connected to the second protection module;

[0037] The first protection module is used for overcurrent protection, and the second protection module is used for surge protection.

[0038] In this embodiment, the first end of the AC / DC module is directly connected to the mains power grid, and the second end is connected to the first end of the charging switching module, thereby forming a mains charging path. The AC / DC module is used to convert the mains power into a suitable direct current to provide a stable direct current power supply for the subsequent charging process.

[0039] The photovoltaic panel is connected to the second end of the charging switching module, and the DC power generated by the photovoltaic panel can directly charge the battery through the charging switching module. The photovoltaic panel is a device that uses solar cells to convert sunlight energy into electrical energy, providing green and renewable energy for the intelligent charging power supply system.

[0040] The charging switching module is the energy routing center of the intelligent charging power supply system, and automatically selects the appropriate power input (mains power or photovoltaic power) to charge the battery according to the set conditions. In this embodiment, when the intensity of sunlight is sufficient during the day, the charging switching module will connect the charging circuit corresponding to the photovoltaic panel, and preferentially charge the battery through the direct current output by the photovoltaic panel. Photovoltaic panels are highly dependent on the sun. When it is rainy or at night, the output DC voltage cannot reach the normal charging voltage of the battery. At this time, the charging circuit corresponding to the photovoltaic panel is disconnected, and the charging switching module automatically switches to the charging circuit provided by the mains.

[0041] Whether it is powered by photovoltaic panels or batteries, the power supply current may be unstable. If the current of the battery is too large during charging, it will have an adverse effect on the battery and other related components. For example:

[0042] Battery overheating: Excessive charging current means that the battery needs to absorb more energy, which will cause the battery temperature to rise rapidly. Long-term overheating may reduce the service life of the battery and may even cause thermal runaway, resulting in battery explosion or fire.

[0043] Battery damage: Excessive charging current may accelerate the chemical reaction inside the battery, thereby increasing the consumption of electrolyte and causing a decrease in battery capacity.

[0044] Efficiency reduction: When the load is too large, the efficiency of the charging system may decrease. This means that more energy is wasted instead of being stored in the battery.

[0045] Safety issues: Battery overheating and damage may cause fire or explosion. In addition, excessive current may also cause electrical fire or electric shock accidents.

[0046] Therefore, a first protection module is added in this embodiment, and the first end of the first protection module is connected to the third end of the charging switching module to receive the power from the switching module; the second end is connected to the battery to provide it with a controlled and safe charging current. This prevents the battery from being damaged or causing a safety accident due to excessive current during the charging process. When it is detected that the charging current exceeds the preset threshold, the module will immediately cut off the charging current to protect the battery.

[0047] When the battery is connected to a charger or is affected by the external environment, a brief spike current may occur, resulting in a brief high current pulse (surge) due to the difference between the battery charge and the charger charge. If this continues for a long time, it will affect the battery's service life.

[0048] To this end, the present embodiment adds a second protection module to prevent instantaneous high current pulses (surges) from impacting the battery. Such surges may be caused by grid failures, lightning strikes or other external interferences. If not protected, they may damage the charging system or the battery. The second protection module is connected in parallel with the first protection module, that is, they are connected between the second end of the first protection module and the battery. In this way, regardless of whether the charging current passes through the first protection module, the surge protection always covers the entire path to the battery, providing comprehensive surge protection.

[0049] The design of the entire system enables each module to work together, not only effectively utilizing electricity from different sources (mains electricity and solar energy), but also ensuring the safety of electricity during transmission and storage. This design is suitable for occasions that require backup power, such as homes, hospitals or any critical infrastructure, and can provide necessary power support in the event of a power outage.

[0050] In this embodiment, the intelligent charging power supply system integrates two energy inputs, namely, mains electricity and solar energy, and flexibly switches through the charging switching module to ensure that the battery can be effectively charged under different conditions. At the same time, it combines the dual safety measures of overcurrent protection and surge protection to achieve intelligent, safe and efficient charging management of the battery, protect the battery and other components of the system from damage, and solve the problem of poor reliability of the traditional charging power supply system in the process of charging the battery.

[0051] like Figure 1 As shown, the intelligent charging power supply system in this embodiment further includes a light intensity detection module, which is connected to the fourth end of the charging switching module and is used to convert the optical signal into an electrical signal.

[0052] Photovoltaic panels are more dependent on the intensity of sunlight. When the intensity of sunlight meets the requirements, the photovoltaic panels can output normal DC voltage. When the intensity of sunlight is weak, the voltage output by the photovoltaic panels will be lower than the minimum charging voltage of the battery. If the battery continues to be charged at this time, the battery cannot be charged normally, resulting in low energy utilization. If the battery is charged at a voltage lower than the specified voltage for a long time, it may cause sulfation of the battery, shorten its service life, or even damage the battery.

[0053] In order to solve the above problems, a light intensity detection circuit is added in this embodiment to monitor the light intensity in the environment in real time and convert the light signal into an electrical signal to transmit to the charging switching module. The light intensity detection module is connected to the fourth end of the charging switching module to provide the switching module with light intensity information as a basis for judging whether to use AC power or photovoltaic power for charging. The charging switching module can select the appropriate power input (AC power or photovoltaic power) to charge the battery according to the electrical signal output by the light intensity detection circuit.

[0054] In this embodiment, the addition of the light intensity detection module enables the system to automatically switch the power input according to the lighting conditions, thereby enhancing its intelligent and adaptive characteristics.

[0055] like Figure 2As shown, in this embodiment, the charging switching module includes a NOT gate U5, a NOT gate U7, a switch tube Q3 and a switch tube Q4; the input end of the NOT gate U5 is connected to the light intensity detection module, the output end of the NOT gate U5 is connected to the control end of the switch tube Q4, the first end of the switch tube Q4 is connected to the second end of the AC / DC module, and the second end of the switch tube Q4 is connected to the first end of the first protection module; the output end of the NOT gate U5 is connected to the input end of the NOT gate U7, the output end of the NOT gate U7 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the photovoltaic panel, and the second end of the switch tube Q3 is connected to the second end of the switch tube Q4.

[0056] In this embodiment, when the sunlight is normal during the day, the light intensity detection module outputs a high level, which is added to the input end of the NOT gate U5. After being inverted by the NOT gate U5, the NOT gate U5 outputs a low level, and the switch tube Q4 is turned off. The first end of the switch tube Q4 is connected to the second end of the AC / DC module, and the charging circuit of the mains is disconnected. The low level output by the NOT gate U5 is inverted again by the NOT gate U7 and turned into a high level, and the switch tube Q3 is turned on. The first end of the switch tube Q3 is connected to the photovoltaic panel. At this time, the DC signal output by the photovoltaic panel passes through the switch tube Q3 to charge the battery.

[0057] At night or in rainy weather, the light intensity detection module outputs a low level, which is added to the input of the NOT gate U5. After being inverted by the NOT gate U5, the NOT gate U5 outputs a high level, and the switch tube Q4 is turned on, and the charging circuit of the mains is connected. The AC power provided by the mains is converted into DC power by the AC / DC module, and then the DC power output by the AC / DC module is charged by the switch tube Q4. The high level output by the NOT gate U5 is inverted again by the NOT gate U7 and converted to a low level. The switch tube Q3 is turned off, and the charging circuit corresponding to the photovoltaic panel is disconnected.

[0058] In this embodiment, the charging switching module controls the opening and closing of the switch tube Q3 (photovoltaic charging path) and the switch tube Q4 (mains charging path) respectively according to the signal of the light intensity detection module through the logic circuit composed of the NOT gate U5 and the NOT gate U7, thereby realizing the function of automatically switching to mains charging when the light intensity is low and using photovoltaic power for charging when the light intensity is high. This design effectively utilizes renewable energy and ensures that the battery can still be reliably charged when the light conditions are poor.

[0059] like Figure 2As shown, in this embodiment, the first protection module includes a resistor R2, a resistor R3, a current sensor U1, a resistor R1, a variable resistor RP1, an amplifier U2 and a switch tube Q1; the first end of the resistor R2 is connected to the third end of the charging switching module, the second end of the resistor R2 is grounded through the resistor R3, and the second end of the resistor R2 is connected to the inverting input end of the amplifier U2; the first input end of the current sensor U1 is connected to the third end of the charging switching module, the second input end of the current sensor U1 is used to connect the positive electrode of the battery, the output end of the current sensor U1 is connected to the first end of the variable resistor RP1 through the resistor R1, the second end of the variable resistor RP1 is grounded, and the sliding end of the variable resistor RP1 is connected to the in-phase input end of the amplifier U2; the output end of the amplifier U2 is connected to the control end of the switch tube Q1, the first end of the switch tube Q1 is connected to the second input end of the current sensor U1, and the second end of the switch tube Q1 is grounded.

[0060] During the battery charging process, the charging current first passes through the first input terminal of the current sensor U1, then flows out from the second input terminal of the current sensor U1 and is sent to the positive electrode of the battery to charge the battery. The current sensor U1 is used to detect the charging current during the battery charging process, and converts the detected current signal into a voltage signal and outputs it through the output terminal of the current sensor U1. When the charging current increases, the voltage output by the current sensor U1 also increases.

[0061] Resistors R2 and R3 form a voltage divider circuit, which reduces the voltage output by the charging switching module (the third terminal) to a suitable level and sends it to the inverting input terminal of amplifier U2 as a reference voltage. Among them, the voltage regulator D1 is used to stabilize the voltage and provide a stable reference voltage for the inverting input terminal of amplifier U2 to improve the stability of the circuit.

[0062] Resistor R1 and variable resistor RP1 also form a voltage divider circuit, which reduces the voltage output by current sensor U1 to a suitable level and sends it to the non-inverting input terminal of amplifier U2. By adjusting the sliding end of variable resistor RP1, the threshold voltage of overcurrent protection can be set. Amplifier U2 constitutes a comparator, which is used to compare the voltage between the inverting input terminal of amplifier U2 and the non-inverting input terminal of amplifier U2. When the charging current is normal, the voltage at the non-inverting input terminal of amplifier U2 is lower than the voltage at the inverting input terminal, amplifier U2 outputs a low level, switch tube Q1 is cut off, and the battery can be charged normally. When the charging current exceeds the set threshold, the voltage at the non-inverting input terminal of amplifier U2 increases, exceeding the voltage at the inverting input terminal of amplifier U2, and amplifier U2 outputs a high level. At this time, switch tube Q1 is turned on, and the current flowing out from the second input terminal of current sensor U1 passes through switch tube Q1 to ground, thereby cutting off the charging current of the battery and achieving overcurrent protection.

[0063] In this embodiment, the first protection module detects the charging current of the battery through the current sensor U1, and the amplifier U2 compares and drives the switch tube Q1 to perform overcurrent protection. By adjusting the variable resistor RP1, the threshold of overcurrent protection can be set to ensure that the battery provides effective overcurrent protection during the charging process.

[0064] like Figure 2 As shown, in this embodiment, the second protection module includes a resistor R5, a resistor R6, a capacitor C3 and a switch tube Q2; the first end of the resistor R5 is connected to the second end of the first protection module, the second end of the resistor R5 is grounded through the resistor R6, the second end of the resistor R5 is grounded through the capacitor C3, the second end of the resistor R5 is connected to the control end of the switch tube Q2, the first end of the switch tube Q2 is used to connect the negative electrode of the battery, and the second end of the switch tube Q2 is grounded.

[0065] The second protection module is used for surge protection. The resistor R5 and the resistor R6 form a voltage divider circuit. When the battery is connected to the charging power supply, a high current pulse may be generated. Since the voltage across the capacitor cannot change suddenly, the voltage across the capacitor C3 is 0 when the charging power supply is connected, and the switch tube Q2 is turned off. The first end of the switch tube Q2 and the second end of the switch tube Q2 are connected between the negative electrode of the battery and the ground. When the charging power supply is connected, the charging circuit of the battery is not connected, and then the capacitor C3 starts to charge. When the voltage on the capacitor C3 is higher than the start voltage of the switch tube Q2, the switch tube Q2 is turned on. At this time, the charging circuit of the battery is connected and charging starts.

[0066] In this embodiment, in order to prevent the high current pulse from impacting the battery, the characteristic that the voltage across the capacitor cannot change suddenly is utilized. When the battery is connected to the power supply, the high current pulse is absorbed by the capacitor C3 to ensure that the battery is provided with effective surge protection during the charging process.

[0067] like Figure 3 As shown, the light intensity detection module in this embodiment includes a variable resistor RP2, a phototransistor U6, a resistor R10, an amplifier U4, a resistor R12, an optical coupler U3 and a resistor R13; the first end of the variable resistor RP2 is connected to a 5V power supply, the second end of the variable resistor RP2 is connected to a first end of the phototransistor U6, the second end of the phototransistor U6 is grounded through the resistor R10, the second end of the phototransistor U6 is connected to the in-phase input end of the amplifier U4, the output end of the amplifier U4 is connected to the inverting input end of the amplifier U4, the output end of the amplifier U4 is connected to the first input end of the optical coupler U3 through the resistor R12, the second input end of the optical coupler U3 is grounded, the first output end of the optical coupler U3 is connected to the 5V power supply through the resistor R13, and the second output end of the optical coupler U3 is connected to the fourth end of the charging switching module.

[0068] In this embodiment, the light intensity detection module is used to detect sunlight signals and convert the detected light signals into electrical signals for output.

[0069] Specifically, the phototransistor U6 is used to detect sunlight signals and convert the detected light signals into electrical signals. The stronger the sunlight, the greater the current flowing through the phototransistor U6. The resistor R10 is connected in series with the phototransistor U6. Therefore, the stronger the sunlight, the greater the voltage on the resistor R10. The amplifier U4 forms a follower, which sends the voltage on the resistor R10 to the first input terminal of the optocoupler U3.

[0070] When the intensity of sunlight is sufficient, the voltage output by amplifier U4 is greater than the conduction voltage of optocoupler U3, optocoupler U3 is turned on, and the second output terminal of optocoupler U3 outputs a high level to the input terminal of NOT gate U5. When the intensity of sunlight is insufficient, the voltage output by amplifier U4 is less than the conduction voltage of optocoupler U3, optocoupler U3 is turned off, and the second output terminal of optocoupler U3 outputs a low level to the input terminal of NOT gate U5.

[0071] The optocoupler U3 serves to isolate the signal, thereby avoiding malfunction of the charging switching module and improving the reliability of the circuit operation.

[0072] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. Intelligent charging power system, characterized in that: It includes an AC / DC module, a photovoltaic panel, a charging switching module, a first protection module and a second protection module; The first end of the AC / DC module is used to connect to the mains, and the second end of the AC / DC module is connected to the first end of the charging switching module; The photovoltaic panel is connected to the second end of the charging switching module, and the photovoltaic panel is used to convert solar energy into electrical energy; The third end of the charging switching module is connected to the first end of the first protection module, and the second end of the first protection module is used to connect to the battery; The second end of the first protection module is connected to the second protection module; The first protection module is used for overcurrent protection, and the second protection module is used for surge protection.

2. The intelligent charging power supply system according to claim 1, characterized in that: It also includes a light intensity detection module, which is connected to the fourth end of the charging switching module and is used to convert the optical signal into an electrical signal.

3. The intelligent charging power supply system according to claim 2, characterized in that: The charging switching module includes a NOT gate U5, a NOT gate U7, a switch tube Q3 and a switch tube Q4; The input end of the NOT gate U5 is connected to the light intensity detection module, the output end of the NOT gate U5 is connected to the control end of the switch tube Q4, the first end of the switch tube Q4 is connected to the second end of the AC / DC module, and the second end of the switch tube Q4 is connected to the first end of the first protection module; The output end of the NOT gate U5 is connected to the input end of the NOT gate U7, the output end of the NOT gate U7 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the photovoltaic panel, and the second end of the switch tube Q3 is connected to the second end of the switch tube Q4.

4. The intelligent charging power supply system according to claim 1, characterized in that: The first protection module includes a resistor R2, a resistor R3, a current sensor U1, a resistor R1, a variable resistor RP1, an amplifier U2 and a switch tube Q1; The first end of the resistor R2 is connected to the third end of the charging switching module, the second end of the resistor R2 is grounded through the resistor R3, and the second end of the resistor R2 is connected to the inverting input end of the amplifier U2; The first input end of the current sensor U1 is connected to the third end of the charging switching module, the second input end of the current sensor U1 is used to connect to the positive electrode of the battery, the output end of the current sensor U1 is connected to the first end of the variable resistor RP1 through the resistor R1, the second end of the variable resistor RP1 is grounded, and the sliding end of the variable resistor RP1 is connected to the non-inverting input end of the amplifier U2; The output end of the amplifier U2 is connected to the control end of the switch tube Q1 , the first end of the switch tube Q1 is connected to the second input end of the current sensor U1 , and the second end of the switch tube Q1 is grounded.

5. The intelligent charging power supply system according to claim 1, characterized in that: The second protection module includes a resistor R5, a resistor R6, a capacitor C3 and a switch tube Q2; The first end of the resistor R5 is connected to the second end of the first protection module, the second end of the resistor R5 is grounded through the resistor R6, the second end of the resistor R5 is grounded through the capacitor C3, the second end of the resistor R5 is connected to the control end of the switch tube Q2, the first end of the switch tube Q2 is used to connect the negative electrode of the battery, and the second end of the switch tube Q2 is grounded.

6. The intelligent charging power supply system according to claim 2, characterized in that: The light intensity detection module includes a variable resistor RP2, a phototransistor U6, a resistor R10, an amplifier U4, a resistor R12, an optical coupler U3 and a resistor R13; The first end of the variable resistor RP2 is connected to a 5V power supply, the second end of the variable resistor RP2 is connected to the first end of the phototransistor U6, the second end of the phototransistor U6 is grounded through the resistor R10, the second end of the phototransistor U6 is connected to the in-phase input end of the amplifier U4, the output end of the amplifier U4 is connected to the inverting input end of the amplifier U4, the output end of the amplifier U4 is connected to the first input end of the optocoupler U3 through the resistor R12, the second input end of the optocoupler U3 is grounded, the first output end of the optocoupler U3 is connected to the 5V power supply through the resistor R13, and the second output end of the optocoupler U3 is connected to the fourth end of the charging switching module.

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