A solar photovoltaic charging control circuit

Abstract

The utility model relates to the technical field of photovoltaic charging, and discloses a control circuit for solar photovoltaic charging, including: a control module, a buck tube, a first diode pair, a first inductor, a boost tube, a second diode pair, a first electrolytic capacitor, a field effect tube, a voltage stabilizing circuit, a photovoltaic current monitoring circuit, and a battery current monitoring circuit. The control module sends a corresponding drive signal to the boost tube and / or the buck tube to realize the buck-boost function regulation, so as to be applicable to charging products with various input voltages, thereby improving the versatility and convenience of photovoltaic charging. The buck circuit is composed of the first diode pair, the buck tube, the first inductor, the boost tube, the second diode pair, and the first electrolytic capacitor, and the buck circuit is composed of the buck tube, the first inductor, the boost tube, the second diode pair, and the first electrolytic capacitor. The diode pair, the field effect tube, and the voltage stabilizing circuit are arranged in the buck-boost circuit to simplify the circuit layout while stabilizing the input current of the photovoltaic input end, thereby improving the stability of current monitoring.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic charging, in particular to a regulating circuit for solar photovoltaic charging. Background Art

[0002] In the prior art, when photovoltaic modules are used to charge charging products, the input voltage obtained by converting solar energy is mostly required to be greater than the battery voltage, and the input voltage needs to be input into the battery through a step-down circuit.

[0003] The existing photovoltaic charging buck-boost circuit has a complex structural control, which makes it difficult to accurately monitor the unstable input current converted by the photovoltaic module, resulting in low versatility of photovoltaic charging and difficulty in applying it to various charging products and photovoltaic conversion circuits. Utility Model Content

[0004] The purpose of the utility model is to provide a solar photovoltaic charging control circuit to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The utility model solves the technical problem by providing a solar photovoltaic charging control circuit, including a control module, a buck tube, a first diode pair tube, a first inductor, a boost tube, a second diode pair tube, a first electrolytic capacitor, a field effect tube, a voltage stabilizing circuit, a photovoltaic current monitoring circuit and a battery current monitoring circuit;

[0006] The drain of the buck tube and the drain of the field effect tube are both connected to the photovoltaic input terminal, the gate of the buck tube and the gate of the boost tube are both connected to the control module, and the source of the buck tube is respectively connected to the cathode of the first diode pair and the first inductor;

[0007] The drain of the boost tube is connected to the anode of the first inductor and the second diode pair tube respectively, and the source of the boost tube is connected to the input end of the battery current monitoring circuit;

[0008] The anodes of the first diode pair are respectively connected to the input end of the photovoltaic current monitoring circuit, and the cathodes of the second diode pair are connected to the charging end of the battery through the first electrolytic capacitor;

[0009] The source of the field effect tube and the gate of the field effect tube are both connected to the input end of the voltage stabilizing circuit, the input end of the photovoltaic current monitoring circuit and the input end of the battery current monitoring circuit are both connected to the output end of the voltage stabilizing circuit, the output end of the photovoltaic current monitoring circuit and the output end of the battery current monitoring circuit are both connected to the control module, and the input end of the battery current monitoring circuit is connected to the battery charging end.

[0010] Further, the voltage stabilizing circuit includes: a voltage stabilizing diode, a first voltage stabilizing resistor and a second voltage stabilizing resistor;

[0011] The anode of the voltage-stabilizing diode is respectively connected to the source of the field effect tube, the anode of the first diode pair, the input end of the photovoltaic current monitoring circuit and the input end of the battery current monitoring circuit, and the cathode of the voltage-stabilizing diode is connected to the gate of the field effect tube; the first voltage-stabilizing resistor is connected to the voltage-stabilizing diode in parallel, and the second voltage-stabilizing resistor is connected to the gate of the field effect tube.

[0012] Furthermore, a solar photovoltaic charging control circuit also includes: a photovoltaic voltage monitoring circuit;

[0013] The input end of the photovoltaic voltage monitoring circuit is connected to the photovoltaic input end and the output end of the voltage stabilizing circuit respectively, and the output end of the photovoltaic voltage monitoring circuit is connected to the control module.

[0014] Furthermore, a solar photovoltaic charging control circuit also includes: a battery voltage monitoring circuit;

[0015] The input end of the battery voltage monitoring circuit is connected in parallel with the first electrolytic capacitor, and the output end of the battery voltage monitoring circuit is connected to the control module.

[0016] Further, the photovoltaic current monitoring circuit includes: a first sampling resistor and a first amplification circuit;

[0017] The first sampling resistor is connected to the anode of the first diode pair and the output end of the voltage stabilizing circuit respectively, the input end of the first amplifier circuit is connected to the first sampling resistor, and the output end of the first amplifier circuit is connected to the control module.

[0018] Further, the battery current monitoring circuit includes: a second sampling resistor and a second amplification circuit;

[0019] The second sampling resistor is connected to the battery charging end and the source of the boost tube respectively, the input end of the second amplifier circuit is connected to the output end of the voltage stabilizing circuit and the second sampling resistor respectively, and the output end of the second amplifier circuit is connected to the control module.

[0020] Further, the photovoltaic voltage monitoring circuit includes: a second electrolytic capacitor, a first resistor, a second resistor and a third resistor;

[0021] The second electrolytic capacitor is connected to the photovoltaic input end, one end of the first resistor is connected to the positive electrode of the second electrolytic capacitor, the other end of the first resistor is connected to one end of the second resistor and one end of the third resistor, the other end of the second resistor is connected to the control module, and the other end of the third resistor is connected to the negative electrode of the second electrolytic capacitor.

[0022] Furthermore, a solar photovoltaic charging control circuit also includes: a first RC series circuit and a second RC series circuit;

[0023] The first RC series circuit is connected to the drain of the buck tube and the source of the buck tube respectively, and the second RC series circuit is connected to the drain of the boost tube and the source of the boost tube respectively.

[0024] Furthermore, the first diode pair and the second diode pair are both common cathode fast recovery diode pairs.

[0025] Furthermore, the models of the boost tube and the buck tube are both IRFB3306.

[0026] The beneficial effect of the utility model is that the control module sends corresponding drive signals to the boost tube and / or the buck tube to realize the boost and buck function regulation when the low-voltage photovoltaic charges the high-input voltage battery. It is not limited to high-voltage or low-voltage solar panels or photovoltaic conversion circuits, and can be applied to charging products with various input voltages, thereby improving the versatility and convenience of photovoltaic charging.

[0027] A step-down circuit is formed by a first diode pair, a step-down tube, a first inductor and a first electrolytic capacitor; a step-up circuit is formed by a step-down tube, a first inductor, a step-up tube, a second diode pair and a first electrolytic capacitor; a diode pair is arranged in the step-up and step-down circuit, and a field effect tube and a voltage stabilizing circuit are arranged to simplify the circuit layout while stabilizing the current input to the photovoltaic input end, thereby improving the stability of current monitoring and ensuring the stability of solar photovoltaic charging regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a partial circuit diagram of a solar photovoltaic charging control circuit provided by an embodiment of the utility model;

[0029] Figure 2 This is a partial circuit diagram of a solar photovoltaic charging control circuit provided by another embodiment of the utility model;

[0030] Figure 3 This is a partial circuit diagram of a solar photovoltaic charging control circuit provided by another embodiment of the utility model. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and cannot be understood as limiting the present utility model.

[0032] It should be noted that although the functional module division is performed in the schematic diagram, in some cases, the module division can be different from that in the system.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0035] Conventionally, when most photovoltaic modules are used to charge charging products, the input voltage obtained by solar energy conversion is mostly required to be greater than the battery voltage, and the input voltage needs to be input into the battery through a step-down circuit. When low-voltage solar panels or low-voltage photovoltaic conversion circuits are used for charging, it is difficult to provide a suitable supply voltage to the high-input voltage battery.

[0036] In the prior art, the structure control of the buck-boost circuit in photovoltaic charging is relatively complex, and the current stability of the photovoltaic charging system is affected by many factors. It is difficult to accurately monitor the unstable input current. The complex circuit structure also leads to low versatility of the photovoltaic charging circuit, which is difficult to apply to various charging products and photovoltaic conversion circuits.

[0037] Reference Figures 1 to 3 In some embodiments of the present invention, a solar photovoltaic charging control circuit includes: a buck tube M1, a boost tube M2, a field effect tube M3, a first inductor L1, a voltage stabilizing circuit 100, a control module, a first electrolytic capacitor CE1, a first diode pair D1, a second diode pair D2, a photovoltaic current monitoring circuit 200 and a battery current monitoring circuit 300.

[0038] The drain of the buck tube M1 is electrically connected to the photovoltaic input terminal, the gate of the buck tube M1 is electrically connected to the control module, the source of the buck tube M1 is electrically connected to the cathode of the first diode D1, and the source of the buck tube M1 is also electrically connected to one end of the first inductor L1.

[0039] The anode of the first diode pair D1 is electrically connected to the input end of the photovoltaic current monitoring circuit 200, the other end of the first inductor L1 is electrically connected to the drain of the boost tube M2, the gate of the boost tube M2 is electrically connected to the control module, and the source of the boost tube M2 is electrically connected to the input end of the battery current monitoring circuit 300.

[0040] The other end of the first inductor L1 is also electrically connected to the anode of the second diode pair D2, the cathode of the second diode pair D2 is electrically connected to the positive electrode of the first electrolytic capacitor CE1, and both ends of the first electrolytic capacitor CE1 are connected to the charging end of the battery, so that the cathode of the second diode pair D2 is electrically connected to the charging end of the battery through the first electrolytic capacitor CE1.

[0041] Among them, the first diode pair D1 and the second diode pair D2 are both common cathode fast recovery diode pairs. By using diode pairs, the circuit layout is simplified, the efficient conversion of the charging power supply is achieved, the loss is reduced, and the stability of the charging power supply is improved. The model of the boost tube M2 and the buck tube M1 are both IRFB3306. Its fast switching characteristics and stable performance can ensure the efficient and stable operation of the control circuit.

[0042] In one embodiment, a step-down circuit is formed by the first diode pair D1, the buck tube M1, the first inductor L1 and the first electrolytic capacitor CE1, and the control module sends a step-down drive signal to the buck tube M1, and the control module also sends a cut-off signal to the boost tube M2. The buck tube M1 is in the on state, and the boost tube M2 is in the off state. Among them, the step-down drive signal is a PWM signal, and the control module can adjust the on-time of the buck tube M1 through the step-down drive signal.

[0043] In one embodiment, a boost circuit is formed by a buck tube M1, a first inductor L1, a boost tube M2, a second diode pair tube D2, and a first electrolytic capacitor CE1, and a control module sends a boost drive signal to the boost tube M2. The control module also sends a closing signal to the buck tube M1. The buck tube M1 is in a closed state, and the boost tube M2 is in a conducting state. Among them, the boost drive signal is a PWM signal, and the control module can adjust the conduction time of the boost tube M2 through the boost drive signal.

[0044] The control module sends the corresponding drive signal to the boost tube M2 and / or the buck tube M1 to achieve the buck-boost function when the low-voltage photovoltaic charges the high-input voltage battery. When charging with a low-voltage solar panel or a low-voltage photovoltaic conversion circuit, the buck-boost tube can be regulated by the control module to supply a suitable supply voltage to the high-input voltage battery. The photovoltaic charging control circuit of the utility model is not limited to high-voltage or low-voltage solar panels or photovoltaic conversion circuits, and can be applied to charging products with various input voltages, thereby improving the versatility and convenience of photovoltaic charging.

[0045] The drain of the field effect transistor M3 is electrically connected to the photovoltaic input terminal, the gate of the field effect transistor M3 is electrically connected to the input terminal of the voltage stabilizing circuit 100 , and the drain of the field effect transistor M3 is electrically connected to the input terminal of the voltage stabilizing circuit 100 .

[0046] The output end of the voltage stabilizing circuit 100 is electrically connected to the input end of the photovoltaic current monitoring circuit 200. The output end of the photovoltaic current monitoring circuit 200 is electrically connected to the control module.

[0047] The input end of the battery current monitoring circuit 300 is also electrically connected to the battery charging end, the output end of the voltage stabilizing circuit 100 is also electrically connected to the input end of the battery current monitoring circuit 300, and the output end of the battery current monitoring circuit 300 is electrically connected to the control module.

[0048] By setting up the voltage stabilizing circuit 100 and the field effect transistor M3, the current inputted at the photovoltaic input terminal is stabilized, so that the battery current monitoring circuit 300 and the photovoltaic current can monitor the stable current, improve the stability and accuracy of the current monitoring, and ensure the stability of the solar photovoltaic charging regulation. The voltage stabilizing circuit 100 can help the field effect transistor M3 stabilize its operating voltage, and prevent the field effect transistor M3 from being unstable or damaged due to the voltage fluctuation inputted at the photovoltaic input terminal.

[0049] Through the scheme of the above-mentioned embodiment, the utility model realizes the buck-boost function regulation when the low-voltage photovoltaic charges the high-input voltage battery by sending the corresponding driving signal to the boost tube M2 and / or the buck tube M1 through the control module. It is not limited to high-voltage or low-voltage solar panels or photovoltaic conversion circuits, and can be applied to charging products with various input voltages, thereby improving the versatility and convenience of photovoltaic charging.

[0050] A step-down circuit is formed by a first diode pair D1, a buck tube M1, a first inductor L1 and a first electrolytic capacitor CE1; a step-down circuit is formed by a buck tube M1, a boost tube M2, a first inductor L1, a second diode pair D2 and a first electrolytic capacitor CE1; a diode pair is arranged in the step-up and step-down circuit, and a field effect tube M3 and a voltage stabilizing circuit 100 are arranged to simplify the circuit layout while stabilizing the current input to the photovoltaic input terminal, thereby improving the stability of current monitoring and ensuring the stability of solar photovoltaic charging regulation.

[0051] Reference Figures 1 to 3 In some embodiments of the present invention, the voltage stabilizing circuit 100 includes: a voltage stabilizing diode ZD1, a first voltage stabilizing resistor R4 and a second voltage stabilizing resistor R5.

[0052] One end of the first voltage-stabilizing resistor R4 is electrically connected to the source of the field effect transistor M3, and the other end of the first voltage-stabilizing resistor R4 is electrically connected to the gate of the field effect transistor M3. The anode of the voltage-stabilizing diode ZD1 is electrically connected to the source of the field effect transistor M3, and the cathode of the voltage-stabilizing diode ZD1 is electrically connected to the gate of the field effect transistor M3. That is, the first voltage-stabilizing resistor R4 is connected in parallel with the voltage-stabilizing diode ZD1.

[0053] The anode of the Zener diode ZD1 is also electrically connected to the input terminal of the photovoltaic current monitoring circuit 200 , and is also electrically connected to the input terminal of the battery current monitoring circuit 300 .

[0054] One end of the second voltage-stabilizing resistor R5 is electrically connected to the gate of the field effect transistor M3 , and the other end of the second voltage-stabilizing resistor R5 is electrically connected to the auxiliary power supply.

[0055] The voltage-stabilizing diode ZD1 can help the field effect transistor M3 stabilize its operating voltage, prevent the field effect transistor M3 from being unstable or damaged due to voltage fluctuations at the photovoltaic input end, thereby stabilizing the current at the photovoltaic input end, making it easier for the battery current monitoring circuit 300 and the photovoltaic current to monitor a stable current, improving the stability and accuracy of current monitoring, and ensuring the stability of solar photovoltaic charging regulation.

[0056] Reference Figures 1 to 3 In some embodiments of the present invention, the control circuit further includes: a second inductor L2, a photovoltaic voltage monitoring circuit 400, a battery voltage monitoring circuit 500, a first RC series circuit 600 and a second RC series circuit 700.

[0057] One end of the second inductor L2 is electrically connected to the photovoltaic input end, the other end of the second inductor L2 is electrically connected to the drain of the buck tube M1, and the other end of the second inductor L2 is also electrically connected to the input end of the photovoltaic voltage detection circuit.

[0058] The input end of the photovoltaic voltage monitoring circuit 400 is electrically connected to the photovoltaic input end. The input end of the photovoltaic voltage monitoring circuit 400 is also connected to one end of the first voltage stabilizing resistor R4 to achieve electrical connection with the input end of the voltage stabilizing circuit 100 .

[0059] The output end of the photovoltaic voltage monitoring circuit 400 is electrically connected to the control module, and the photovoltaic voltage monitoring circuit 400 is used to output a photovoltaic voltage monitoring signal to the control module.

[0060] The input end of the battery voltage monitoring circuit 500 is electrically connected to the first electrolytic capacitor CE1 to be connected in parallel with the first electrolytic capacitor CE1. The output end of the battery voltage monitoring circuit 500 is electrically connected to the control module. The battery voltage monitoring circuit 500 is used to output a battery voltage monitoring signal to the control module.

[0061] One end of the first RC series circuit 600 is electrically connected to the drain of the buck tube M1, and the other end of the first RC series circuit 600 is electrically connected to the source of the buck tube M1. One end of the second RC series circuit 700 is electrically connected to the drain of the boost tube M2, and the other end of the first RC series circuit 600 is electrically connected to the source of the boost tube M2.

[0062] The first RC series circuit 600 is composed of a second capacitor C2 and a sixth resistor R6, and the second RC series circuit 700 is composed of a third capacitor C3 and a seventh resistor R7.

[0063] Reference Figures 1 to 3 In some embodiments of the present invention, the photovoltaic current monitoring circuit 200 includes: a first sampling resistor RS1 and a first amplifier circuit 210 .

[0064] One end of the first sampling resistor RS1 is electrically connected to the output end of the voltage stabilizing circuit 100 , and one end of the first sampling resistor RS1 is also electrically connected to the input end of the first amplifying circuit 210 .

[0065] The other end of the first sampling resistor RS1 is electrically connected to the anode of the first diode D1 , and the other end of the first sampling resistor RS1 is also electrically connected to the input end of the first amplifier circuit 210 .

[0066] The output end of the first amplifier circuit 210 is electrically connected to the control module, and the first amplifier circuit 210 is used to output a photovoltaic current monitoring signal.

[0067] The first amplifier circuit 210 includes: a first amplifier chip U1 , an eleventh resistor R11 , a thirteenth resistor R13 , a fourteenth resistor R14 , a seventh capacitor C7 and a sixteenth resistor R16 .

[0068] In this embodiment, the first pin of the first amplifier chip U1 is electrically connected to the other end of the first sampling resistor RS1 and the anode of the first diode D1 through the eleventh resistor R11, and the second pin of the first amplifier chip U1 is grounded.

[0069] One end of the first sampling resistor RS1 is electrically connected to the third pin of the first amplifier chip U1 through the thirteenth resistor R13, the third pin of the first amplifier chip U1 is electrically connected to the fourth pin of the first amplifier chip U1 through the fourteenth resistor R14, the seventh capacitor C7 is connected in parallel with the fourteenth resistor R14. The fourth pin of the first amplifier chip U1 is electrically connected to the control module through the sixteenth resistor R16.

[0070] Reference Figures 1 to 3 In some embodiments of the present invention, the battery current monitoring circuit 300 includes: a second sampling resistor RS2 and a second amplifier circuit 310 .

[0071] One end of the second sampling resistor RS2 is electrically connected to the battery charging end, the other end of the second sampling resistor RS2 is electrically connected to the negative end of the first electrolytic capacitor CE1, and the other end of the second sampling resistor RS2 is also electrically connected to the source of the boost tube M2.

[0072] The input end of the second amplifier circuit 310 is electrically connected to the output end of the voltage stabilizing circuit 100, and the input end of the second amplifier circuit 310 is also electrically connected to the source of the boost tube M2. The input end of the second amplifier circuit 310 is also electrically connected to one end of the second sampling resistor RS2, and the input end of the second amplifier circuit 310 is also electrically connected to the battery charging end.

[0073] The second amplifier circuit 310 includes: a second amplifier chip U2 , an RC parallel circuit, a nineteenth resistor R19 , a twentieth resistor R20 , an eleventh capacitor C11 , and a twenty-second resistor R22 .

[0074] In one embodiment, the first pin of the second amplifier chip U2 is electrically connected to one end of the second sampling resistor RS2 and the battery charging end through an RC parallel circuit. The second pin of the second amplifier chip U2 is grounded. The RC parallel circuit is composed of a seventeenth resistor R17, an eighteenth resistor R18 and a ninth capacitor C9 connected in parallel.

[0075] Through the nineteenth resistor R19, the third pin of the second amplifier chip U2 is electrically connected to the source of the boost tube M2 and the output end of the voltage stabilizing circuit 100. The third pin of the second amplifier chip U2 is electrically connected to the fourth pin of the second amplifier chip U2 through the twentieth resistor R20, and the fourth pin of the second amplifier chip U2 is electrically connected to the control module through the twenty-second resistor R22. The eleventh capacitor C11 is connected in parallel with the twentieth resistor R20.

[0076] Reference Figures 1 to 3 In some embodiments of the present utility model, the photovoltaic voltage monitoring circuit 400 includes: a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a second electrolytic capacitor CE2;

[0077] The second electrolytic capacitor CE2 is connected in parallel with the photovoltaic input end, one end of the first resistor R1 is electrically connected to the positive electrode of the second electrolytic capacitor CE2, the other end of the first resistor R1 is electrically connected to one end of the second resistor R2 and one end of the third resistor R3, the other end of the second resistor R2 is electrically connected to the control module, and the other end of the third resistor R3 is electrically connected to the negative electrode of the second electrolytic capacitor CE2.

[0078] One end of the first capacitor C1 is electrically connected to the control module, one end of the first capacitor C1 is also electrically connected to the other end of the second resistor R2, and the other end of the first capacitor C1 is electrically connected to the other end of the third resistor R3.

[0079] Reference Figures 1 to 3 In some embodiments of the present invention, the battery voltage monitoring circuit 500 includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a fourth capacitor C4.

[0080] One end of the eighth resistor R8 is electrically connected to the positive electrode of the first electrolytic capacitor CE1, the other end of the eighth resistor R8 is electrically connected to one end of the ninth resistor R9 and one end of the tenth resistor R10 respectively, the other end of the ninth resistor R9 is electrically connected to the negative electrode of the first electrolytic capacitor CE1, and the other end of the tenth resistor R10 is electrically connected to the control module.

[0081] One end of the fourth capacitor C4 is electrically connected to the other end of the tenth resistor R10 and the control module respectively, and the other end of the fourth capacitor C4 is electrically connected to the other end of the ninth resistor R9.

[0082] Through the scheme of the above-mentioned embodiment, the control module in the utility model sends the corresponding drive signal to the boost tube M2 and / or the buck tube M1 to realize the boost and buck function regulation when the low-voltage photovoltaic charges the high-input voltage battery. It is not limited to high-voltage or low-voltage solar panels or photovoltaic conversion circuits, and can be applied to charging products with various input voltages, thereby improving the versatility and convenience of photovoltaic charging.

[0083] A step-down circuit is formed by a first diode pair D1, a buck tube M1, a first inductor L1 and a first electrolytic capacitor CE1; a step-up circuit is formed by a buck tube M1, a first inductor L1, a boost tube M2, a second diode pair D2 and a first electrolytic capacitor CE1; a diode pair is arranged in the step-up and step-down circuit, and a field effect tube M3 and a voltage stabilizing circuit 100 are arranged to simplify the circuit layout while stabilizing the current input to the photovoltaic input terminal, thereby improving the stability of current monitoring and ensuring the stability of solar photovoltaic charging regulation.

[0084] The preferred implementation methods of the utility model are specifically described above, but the invention of the utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the utility model. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A solar photovoltaic charging control circuit, characterized in that: include: A control module, a buck tube, a first diode pair, a first inductor, a boost tube, a second diode pair, a first electrolytic capacitor, a field effect tube, a voltage stabilizing circuit, a photovoltaic current monitoring circuit, and a battery current monitoring circuit; The drain of the buck tube and the drain of the field effect tube are both connected to the photovoltaic input terminal, the gate of the buck tube and the gate of the boost tube are both connected to the control module, and the source of the buck tube is respectively connected to the cathode of the first diode pair and the first inductor; The drain of the boost tube is connected to the anode of the first inductor and the second diode pair tube respectively, and the source of the boost tube is connected to the input end of the battery current monitoring circuit; The anodes of the first diode pair are respectively connected to the input end of the photovoltaic current monitoring circuit, and the cathodes of the second diode pair are connected to the charging end of the battery through the first electrolytic capacitor; The source of the field effect tube and the gate of the field effect tube are both connected to the input end of the voltage stabilizing circuit, the input end of the photovoltaic current monitoring circuit and the input end of the battery current monitoring circuit are both connected to the output end of the voltage stabilizing circuit, the output end of the photovoltaic current monitoring circuit and the output end of the battery current monitoring circuit are both connected to the control module, and the input end of the battery current monitoring circuit is connected to the battery charging end.

2. A solar photovoltaic charging control circuit according to claim 1, characterized in that: The voltage stabilizing circuit comprises: a voltage stabilizing diode, a first voltage stabilizing resistor and a second voltage stabilizing resistor; The anode of the voltage-stabilizing diode is respectively connected to the source of the field effect tube, the anode of the first diode pair, the input end of the photovoltaic current monitoring circuit and the input end of the battery current monitoring circuit, and the cathode of the voltage-stabilizing diode is connected to the gate of the field effect tube; the first voltage-stabilizing resistor is connected to the voltage-stabilizing diode in parallel, and the second voltage-stabilizing resistor is connected to the gate of the field effect tube.

3. A solar photovoltaic charging control circuit according to claim 1, characterized in that: Also included: photovoltaic voltage monitoring circuit; The input end of the photovoltaic voltage monitoring circuit is connected to the photovoltaic input end and the output end of the voltage stabilizing circuit respectively, and the output end of the photovoltaic voltage monitoring circuit is connected to the control module.

4. A solar photovoltaic charging control circuit according to claim 1, characterized in that: Also includes: Battery voltage monitoring circuit; The input end of the battery voltage monitoring circuit is connected in parallel with the first electrolytic capacitor, and the output end of the battery voltage monitoring circuit is connected to the control module.

5. A solar photovoltaic charging control circuit according to claim 1, characterized in that: The photovoltaic current monitoring circuit comprises: a first sampling resistor and a first amplifying circuit; The first sampling resistor is connected to the anode of the first diode pair and the output end of the voltage stabilizing circuit respectively, the input end of the first amplifier circuit is connected to the first sampling resistor, and the output end of the first amplifier circuit is connected to the control module.

6. A solar photovoltaic charging control circuit according to claim 1, characterized in that: The battery current monitoring circuit comprises: a second sampling resistor and a second amplifying circuit; The second sampling resistor is connected to the battery charging end and the source of the boost tube respectively, the input end of the second amplifier circuit is connected to the output end of the voltage stabilizing circuit and the second sampling resistor respectively, and the output end of the second amplifier circuit is connected to the control module.

7. A solar photovoltaic charging control circuit according to claim 3, characterized in that: The photovoltaic voltage monitoring circuit comprises: a second electrolytic capacitor, a first resistor, a second resistor and a third resistor; The second electrolytic capacitor is connected to the photovoltaic input end, one end of the first resistor is connected to the positive electrode of the second electrolytic capacitor, the other end of the first resistor is connected to one end of the second resistor and one end of the third resistor, the other end of the second resistor is connected to the control module, and the other end of the third resistor is connected to the negative electrode of the second electrolytic capacitor.

8. A solar photovoltaic charging control circuit according to claim 1, characterized in that: Also includes: a first RC series circuit and a second RC series circuit; The first RC series circuit is connected to the drain of the buck tube and the source of the buck tube respectively, and the second RC series circuit is connected to the drain of the boost tube and the source of the boost tube respectively.

9. A solar photovoltaic charging control circuit according to claim 1, characterized in that: The first diode pair and the second diode pair are both common cathode fast recovery diode pairs.

10. A solar photovoltaic charging control circuit according to claim 1, characterized in that: The models of the boost tube and the buck tube are both IRFB3306.

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