CN114784943B - Solar energy storage control circuit - Google Patents

Abstract

The invention discloses a solar energy storage control circuit, comprising: DC input circuit, input protection circuit, input detection and filter circuit, PWM circuit for controlling output power, MCU, output detection and protection circuit, filter circuit, automatic charging Detection module and battery; the DC input circuit, input protection circuit, input detection and filter circuit, PWM circuit, output detection and protection circuit, filter circuit and battery are connected in sequence, and the MCU is connected to the PWM circuit and battery respectively; The automatic charging detection module includes an input sampling unit for sampling the input current and an output sampling unit for adopting the output current, the input sampling unit is connected between the PWM circuit and the input detection and filter circuit, and the output sampling unit is connected to Between the PWM circuit and the output detection and protection circuit. The invention can realize real-time intelligent control of maximum power charging, and shortens charging time for users.

Description

A solar energy storage control circuit

technical field

The invention relates to the technical field of solar energy, in particular to a solar energy storage control circuit.

Background technique

With the rapid development of fast charging technology, especially in the case of outdoor or power failure, energy storage power supply has brought great convenience to people. "Caring for the environment is everyone's responsibility." With the release of the concept of carbon neutrality, more and more people choose clean energy, such as electric vehicles, wind power, solar power, etc. Under the premise of this general direction, The combination of fast charging technology and the concept of carbon neutrality produces our solar energy storage control circuit. As an important clean energy, solar energy is developing rapidly with its advantages of inexhaustibility and no pollution. At present, the solar charging efficiency of most energy storage power sources on the market is very low. Due to the influence of various aspects of the environment (mainly including sunlight intensity, temperature, and humidity), its output has obvious nonlinear characteristics, so the maximum efficiency of solar energy cannot be maximized. converted into electrical output.

Therefore, the prior art still needs to be improved and developed.

Contents of the invention

The object of the present invention is to provide a solar energy storage control circuit, aiming at solving the technical problem of low charging efficiency in the existing solar energy storage control technology.

In order to achieve the above object, the technical solution of the present invention is: a solar energy storage control circuit, which includes: a DC input circuit, an input protection circuit, an input detection and filtering circuit, a PWM circuit for controlling output power, an MCU, an output Detection and protection circuit, filter circuit, automatic charging detection module and battery; the DC input circuit, input protection circuit, input detection and filter circuit, PWM circuit, output detection and protection circuit, filter circuit and battery are connected in sequence, and the MCU respectively connected with the PWM circuit and the battery; the automatic charging detection module includes an input sampling unit for sampling the input current and an output sampling unit for adopting the output current, and the input sampling unit is connected between the PWM circuit and the input detection and filtering Between the circuits, the output sampling unit is connected between the PWM circuit and the output detection and protection circuit.

The solar energy storage control circuit, wherein the input protection circuit includes an anti-reverse connection unit for preventing reverse connection and an overvoltage protection unit for preventing excessive input voltage, and the anti-reverse connection unit is connected to the overvoltage Guard unit connection.

The solar energy storage control circuit, wherein the anti-reverse connection unit includes a field effect transistor Q2, a resistor R8 and a resistor R9, the D pole of the field effect transistor Q2 is connected to the negative pole of the DC input circuit, and the field effect transistor The G pole of Q2 is connected to the positive pole of the DC input circuit through the resistor R8, and the S pole of the field effect transistor Q2 is connected between the G pole of the field effect transistor Q2 and the resistor R8 through the resistor R9.

The solar energy storage control circuit, wherein the overvoltage protection unit includes a voltage regulator diode ZV1, a voltage regulator diode TVS1, a transistor Q9, a field effect transistor Q11, a field effect transistor Q10, a resistor R36, a resistor R37, a resistor R38, Resistor R39, resistor R40 and resistor R41; the anode of the Zener diode ZV1 is connected to the S pole of the field effect transistor Q2, and the negative pole of the Zener diode ZV1 is connected to the transistor Q9 through the resistor R37 and the resistor R36 respectively, and the transistor Q9 passes through Resistor R38 is connected to the G pole of the field effect transistor Q10; the G pole of the field effect transistor Q10 is connected to the positive pole of the Zener diode ZV1 and the S pole of the field effect transistor Q2 through the resistor R39; the S pole of the field effect transistor Q10 is respectively Connect the S pole of the field effect transistor Q11 and the S pole of the field effect transistor Q11; the D pole of the field effect transistor Q10 is connected with the S pole of the field effect transistor Q11 through a resistor 41, and the D pole of the field effect transistor Q10 is connected through a resistor R40 is connected to the negative pole of the voltage stabilizing diode TVS1; the positive pole of the voltage stabilizing diode TVS1 is connected to the D pole of the field effect transistor Q11, and the G pole of the field effect transistor Q11 is connected between the resistor R40 and the resistor R41.

The solar energy storage control circuit, wherein the PWM circuit includes an SC8886 voltage conversion chip, an inductor L1, a field effect transistor Q3, a field effect transistor Q4, a field effect transistor Q5, and a field effect transistor Q6; the field effect transistor Q3 The D pole of the field effect transistor Q6 is connected to the D pole of the field effect transistor Q6 through the inductance L1, the D pole of the field effect transistor Q3 is connected to the S pole of the field effect transistor Q4, and the D pole of the field effect transistor Q6 is connected to the D pole of the field effect transistor Q5. The S pole is connected; the G pole of the field effect transistor Q3, the G pole of the field effect transistor Q4, the G pole of the field effect transistor Q5, and the G pole of the field effect transistor Q6 are respectively connected to the SC8886 voltage conversion chip; the field effect transistor The S pole of Q3 is connected with the S pole of the field effect transistor Q6.

The solar energy storage control circuit, wherein the input detection and filter circuit includes an input detection unit and an input filter unit, one end of the input filter unit is connected to the overvoltage protection unit, and the other end of the input filter unit is connected to the input detection unit. unit connection.

The solar energy storage control circuit, wherein the input detection unit includes a resistor R10, a resistor R11, a resistor R12, a capacitor C8, and a capacitor C9; one end of the resistor R10 is connected to the output end of the input filter unit, and the resistor The other end of R10 is connected to the D pole of the field effect transistor Q4; one end of the resistor R10 is connected to the pin 3 of the SC8886 voltage conversion chip through the resistor R11, and the other end of the resistor R10 is connected to the pin 2 of the SC8886 voltage conversion chip through the resistor R12. pin connection; the end of the resistor R11 connected to the SC8886 voltage conversion chip is grounded through the capacitor C8; the end of the resistor R12 connected to the SC8886 voltage conversion chip is grounded through the capacitor C9.

The solar energy storage control circuit, wherein the output detection and protection circuit includes: an output detection unit and a protection unit, one end of the protection unit is connected to the D pole of the field effect transistor Q5, and the other end of the protection unit connected to the output detection unit; the output detection unit is connected to one end of the filter circuit;

The output detection unit includes: a resistor R19, a resistor R20, a resistor R21 and a capacitor C22; the positive pole of the resistor R19 is connected to the 20 pin of the SC8886 voltage conversion chip through the resistor R20; the negative pole of the resistor R19 is connected to the SC8886 voltage through the resistor R21 Pin 19 of the conversion chip is connected; a capacitor C22 is connected between the positive pole of the resistor R20 and the positive pole of the resistor R21.

The solar energy storage control circuit, wherein the input sampling unit includes a capacitor C25 and a resistor R22, the positive pole of the resistor R22 is connected to the negative pole of the resistor R10; the negative pole of the resistor R22 is connected to pin 1 of the SC8886 voltage conversion chip , and the negative electrode of the resistor R22 is grounded through the capacitor C25;

The output sampling unit includes a capacitor C28, one end of the capacitor C28 is grounded, and the other end is connected to the pin 22 of the SC8886 voltage conversion chip and the D pole of the field effect transistor Q5.

The solar energy storage control circuit, wherein the filtering circuit includes a capacitor C23 and a capacitor C24, the capacitor C23 and the capacitor C24 are connected in parallel, and one end of the capacitor C23 and the capacitor C24 is connected in parallel to the negative pole of the resistor R19, so The other end of the parallel connection of the capacitor C23 and the capacitor C24 is grounded.

Beneficial effects: the invention adopts MCU to cooperate with PWM circuit and automatic charging detection module to realize real-time intelligent control of maximum power charging, which greatly shortens the user's charging time, meets the urgent needs of users for electricity, and has strong versatility and practicability.

Description of drawings

Fig. 1 is a structural block diagram of the present invention.

Fig. 2 is a circuit diagram of the present invention.

Fig. 3 is the MCU connection circuit diagram of the present invention.

Fig. 4 is a circuit diagram of the input protection circuit, input detection and filtering circuit in the present invention.

Fig. 5 is a circuit diagram of the output detection and protection circuit of the present invention.

FIG. 6 is a circuit diagram of a PWM circuit of the present invention.

Fig. 7 is a connection circuit diagram of the filter circuit and the battery of the present invention.

In the figure: 1. DC input circuit; 2. Input protection circuit; 3. Input detection and filter circuit; 4. PWM circuit; 5. Output detection and protection circuit; 6. Filter circuit; 7. MCU; 8. Battery; 9 10. Output sampling unit; 20. Anti-reverse connection unit; 21. Overvoltage protection unit; 30. Input detection unit; 31. Input filter unit; 50. Output detection unit; 51. Protection unit.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

As shown in Figures 1-7, the present invention discloses a solar energy storage control circuit, which includes: a DC input circuit 1, an input protection circuit 2, an input detection and filtering circuit 3, a PWM circuit 4 for controlling output power, MCU 7, output detection and protection circuit 5, filter circuit 6, automatic charging detection module and battery 8; the DC input circuit 1, input protection circuit 2, input detection and filter circuit 3, PWM circuit 4, output detection and protection circuit 5. The filter circuit 6 is connected to the battery 8 in turn, and the MCU7 is connected to the PWM circuit 4 and the battery 8 respectively; the automatic charging detection module includes an input sampling unit 9 for sampling the input current and an output for adopting the output current A sampling unit 10 , the input sampling unit 9 is connected between the PWM circuit 4 and the input detection and filtering circuit 3 , and the output sampling unit 10 is connected between the PWM circuit 4 and the output detection and protection circuit 5 .

After adopting the above-mentioned structure, the present invention uses the input protection circuit 2 to protect the input current and voltage of the DC input circuit 1 from being too large to cause damage to the components of the back-end load. Because solar energy storage will have different light intensities, and photovoltaic panels convert The current and voltage of the incoming electric energy will also change due to the change of light intensity; for example, the voltage and current of the solar circuit on cloudy and sunny days vary greatly, so the charging power also varies greatly. The automatic charging and automatic detection module can automatically identify whether there is an external device connected; through the input detection and filter circuit 3 and the output detection and protection circuit 5, the voltage and current during the charging process can be collected synchronously; and fed back to the MCU through the PWM circuit 4 7. Real-time monitoring by MCU 7, once the set value is exceeded, it will immediately enter the protection state. The input and output voltage and current are controlled by the PWM circuit 4. When the power at the input terminal changes rapidly, the MCU 7 can be used to control the SC8886 voltage conversion chip to quickly obtain the maximum power output at the output terminal and maintain the maximum power continuously. Therefore, the PWM circuit 4 , MCU 7 and the automatic charging detection module cooperate with each other to control whether an external device is connected to the solar energy storage control circuit, and to control and monitor the maximum output power by the PWM circuit 4 and MCU 7 .

Preferably, the input protection circuit 2 includes an anti-reverse connection unit 20 for preventing reverse connection and an overvoltage protection unit 21 for preventing excessive input voltage, the anti-reverse connection unit 20 and the overvoltage protection unit 21 connect.

Preferably, the anti-reverse connection unit 20 includes a field effect transistor Q2, a resistor R8 and a resistor R9, the D pole of the field effect transistor Q2 is connected to the negative pole of the DC input circuit 1, and the G pole of the field effect transistor Q2 passes through The resistor R8 is connected to the positive pole of the DC input circuit 1, and the S pole of the field effect transistor Q2 is connected between the G pole of the field effect transistor Q2 and the resistor R8 through the resistor R9.

After the above-mentioned structure is adopted, the resistor R8 of the present invention, the resistor R9 and the field effect transistor Q2 jointly form a reverse connection protection circuit; Q2 is normally turned on; when it is reversed, after the resistor R8 and resistor R9 divide the voltage, the field effect transistor Q2 cannot be turned on, so as to protect the following components from damage.

Preferably, the overvoltage protection unit 21 includes a voltage regulator diode ZV1, a voltage regulator diode TVS1, a triode Q9, a field effect transistor Q11, a field effect transistor Q10, a resistor R36, a resistor R37, a resistor R38, a resistor R39, a resistor R40 and Resistor R41; the anode of the Zener diode ZV1 is connected to the S pole of the field effect transistor Q2, the negative pole of the Zener diode ZV1 is connected to the triode Q9 through the resistor R37 and the resistor R36 respectively, and the triode Q9 is connected to the field effect transistor through the resistor R38 The G pole of Q10 is connected; the G pole of the field effect transistor Q10 is connected with the positive pole of the Zener diode ZV1 and the S pole of the field effect transistor Q2 through the resistor R39; the S poles of the field effect transistor Q10 are respectively connected to the field effect transistor Q11 The S pole and the S pole of the field effect transistor Q11; the D pole of the field effect transistor Q10 is connected to the S pole of the field effect transistor Q11 through a resistor 41, and the D pole of the field effect transistor Q10 is connected to the Zener diode TVS1 through a resistor R40 The positive pole of the Zener diode TVS1 is connected to the D pole of the field effect transistor Q11, and the G pole of the field effect transistor Q11 is connected between the resistor R40 and the resistor R41.

The overvoltage state in the solar energy storage control circuit is divided into two types: one is the transient voltage is too high, and the other is the continuous voltage is too high. If the transient voltage is too high, a Zener diode TVS1 is added to the circuit to absorb the instantaneous voltage spike; if the continuous voltage is too high, the transistor Q9 is turned on through the Zener diode ZV1, and Q10 is turned on through the voltage dividing resistor R38 and R39. Turn on, after Q10 is turned on, the gate of Q11 is shorted to the ground, so that the field effect transistor Q11 will be turned off, so as to achieve the purpose of input protection.

Preferably, the PWM circuit 4 includes a SC8886 voltage conversion chip, an inductor L1, a field effect transistor Q3, a field effect transistor Q4, a field effect transistor Q5 and a field effect transistor Q6; the D pole of the field effect transistor Q3 passes through the inductor L1 It is connected with the D pole of the field effect transistor Q6, the D pole of the field effect transistor Q3 is connected with the S pole of the field effect transistor Q4, and the D pole of the field effect transistor Q6 is connected with the S pole of the field effect transistor Q5; The G pole of the field effect transistor Q3, the G pole of the field effect transistor Q4, the G pole of the field effect transistor Q5, and the G pole of the field effect transistor Q6 are respectively connected to the SC8886 voltage conversion chip; the S pole of the field effect transistor Q3 is connected to the field The S pole of the effect transistor Q6 is connected.

After adopting the above structure, the SC8886 voltage conversion chip controls the buck-boost to control the input and output voltage and current. When the power at the input terminal changes rapidly, the MCU 7 can control the SC8886 voltage conversion chip to quickly obtain the maximum power output at the output terminal, and continuously Maintain maximum power. Pin 1 of the SC8886 voltage conversion chip is a power input terminal, which is a pin for supplying power to the SC8886 voltage conversion chip, and detects the input voltage at the same time; 16 pins and 17 pins of the SC8886 voltage conversion chip are used as loop voltage compensation and connected to peripheral circuits; SC8886 PIN23, PIN24, PIN26, PIN29, PIN31, and PIN32 of the voltage conversion chip are respectively connected to synchronous power tubes (that is, FET Q3, FET Q4, FET Q5, and FET Q6) to increase the power at the end of the circuit. Current input and output, so as to meet the high power output, thereby shortening the charging time of the charging equipment.

Preferably, the input detection and filtering circuit 3 includes an input detection unit 30 and an input filter unit 31, one end of the input filter unit 31 is connected to the overvoltage protection unit 21, and the other end of the input filter unit 31 is connected to the input detection unit 30 connections.

Preferably, the input detection unit 30 includes a resistor R10, a resistor R11, a resistor R12, a capacitor C8, and a capacitor C9; one end of the resistor R10 is connected to the output end of the input filter unit 31, and the other end of the resistor R10 is connected to the output end of the input filter unit 31. The D pole of the field effect transistor Q4 is connected; one end of the resistor R10 is connected to the 3-pin of the SC8886 voltage conversion chip through the resistor R11, and the other end of the resistor R10 is connected to the 2-pin of the SC8886 voltage conversion chip through the resistor R12; The end of the resistor R11 connected to the SC8886 voltage conversion chip is grounded through the capacitor C8; the end of the resistor R12 connected to the SC8886 voltage conversion chip is grounded through the capacitor C9.

After adopting the above structure, the SC8886 voltage conversion chip detects the voltage at both ends of the resistor R10, thereby calculating the input current through the voltage difference at both ends.

Preferably, the output detection and protection circuit 5 includes: an output detection unit 50 and a protection unit 51, one end of the protection unit 51 is connected to the D pole of the field effect transistor Q5, and the other end of the protection unit 51 is connected to the output The detection unit 50 is connected; the output detection unit 50 is connected to one end of the filter circuit 6;

The output detection unit 50 includes: a resistor R19, a resistor R20, a resistor R21 and a capacitor C22; the positive pole of the resistor R19 is connected to the pin 20 of the SC8886 voltage conversion chip through the resistor R20; the negative pole of the resistor R19 is connected to the SC8886 through the resistor R21 Pin 19 of the voltage conversion chip is connected; a capacitor C22 is connected between the positive pole of the resistor R20 and the positive pole of the resistor R21.

After adopting the above structure, the SC8886 voltage conversion chip samples the output current by detecting the voltage drop of the resistor R19.

Specifically, the SC8886 voltage conversion chip detects the input and output currents through the detection resistor R10 and the resistor R19, and the SC8886 voltage conversion chip feeds back to the MCU 7 through pins 12 and 13. Once the set value of the MCU 7 is exceeded, the MCU 7 can The SC8886 voltage conversion chip is notified to close the field effect transistor Q7 in the output detection and protection circuit through the 12 pins and 13 pins of the SC8886 voltage conversion chip.

The resistors R10 and R19 are used as sampling resistors to detect input current and output current, and have a current limiting function to protect components.

Preferably, the input sampling unit 9 includes a capacitor C25 and a resistor R22, the positive pole of the resistor R22 is connected to the negative pole of the resistor R10; the negative pole of the resistor R22 is connected to pin 1 of the SC8886 voltage conversion chip, and the negative pole of the resistor R22 Ground through capacitor C25;

The output sampling unit 10 includes a capacitor C28, one end of the capacitor C28 is grounded, and the other end is connected to the pin 22 of the SC8886 voltage conversion chip and the D pole of the field effect transistor Q5.

Preferably, the filter circuit 6 includes a capacitor C23 and a capacitor C24, the capacitor C23 and the capacitor C24 are connected in parallel, and one end of the capacitor C23 and the capacitor C24 is connected in parallel to the negative pole of the resistor R19, and the capacitor C23 and the capacitor C24 The other end of the parallel connection is grounded.

The SC8886 voltage conversion chip samples input and output voltages through pins 1 and 22.

As shown in Figures 2 and 3, the MCU 7 is connected to pins 16 and 17 of the SC8886 voltage conversion chip through PIN3 and PIN4 to achieve the purpose of controlling the SC8886 voltage conversion chip; and through algorithm optimization, the SC8886 voltage conversion chip can always output the maximum Power, in order to achieve the highest charging efficiency, thereby shortening the charging time and improving the charging efficiency; even in the case of changeable weather, it can still quickly charge other electronic devices through the output terminal.

The invention adopts MCU 7 to cooperate with PWM circuit 4 and automatic charging detection module to realize real-time intelligent control of maximum power charging, which greatly shortens charging time for users, meets the urgent needs of users for urgent power consumption, and has strong versatility and practicability.

The above is only the preferred embodiment of the present invention, and of course the scope of rights of the present invention cannot be limited by this. It should be pointed out that for those skilled in the art, any modification or equivalent replacement of the technical solution of the present invention without creative work is acceptable. Do not depart from the scope of protection of the technical solution of the present invention.

Claims (6)

1. A solar energy storage control circuit, characterized in that, comprising: a DC input circuit, an input protection circuit, an input detection and filter circuit, a PWM circuit for controlling output power, an MCU, an output detection and protection circuit, a filter circuit, The automatic charging detection module and the battery; the DC input circuit, the input protection circuit, the input detection and filter circuit, the PWM circuit, the output detection and protection circuit, the filter circuit and the battery are sequentially connected, and the MCU is respectively connected to the PWM circuit and the battery; The automatic charging detection module includes an input sampling unit for sampling the input current and an output sampling unit for sampling the output current, the input sampling unit is connected between the PWM circuit and the input detection and filtering circuit, and the output sampling unit Connected between the PWM circuit and the output detection and protection circuit; The input protection circuit includes an anti-reverse connection unit for preventing reverse connection and an overvoltage protection unit for preventing excessive input voltage, and the anti-reverse connection unit is connected to the overvoltage protection unit; The anti-reverse connection unit includes a field effect transistor Q2, a resistor R8 and a resistor R9, the D pole of the field effect transistor Q2 is connected to the negative pole of the DC input circuit, and the G pole of the field effect transistor Q2 is connected to the DC input circuit through the resistor R8 The positive pole of the field effect transistor Q2 is connected between the G pole of the field effect transistor Q2 and the resistor R8 through the resistor R9; The overvoltage protection unit includes a voltage regulator diode ZV1, a voltage regulator diode TVS1, a triode Q9, a field effect transistor Q11, a field effect transistor Q10, a resistor R36, a resistor R37, a resistor R38, a resistor R39, a resistor R40 and a resistor R41; The anode of the Zener diode ZV1 is connected to the S pole of the field effect transistor Q2, the negative pole of the Zener diode ZV1 is connected to the triode Q9 through the resistor R37 and the resistor R36 respectively, and the triode Q9 is connected to the G pole of the field effect transistor Q10 through the resistor R38 The G pole of the field effect transistor Q10 is connected with the positive pole of the Zener diode ZV1 and the S pole of the field effect transistor Q2 through the resistor R39; the S pole of the field effect transistor Q10 is connected with the S pole and the field effect transistor Q11 respectively. The S pole of the effect transistor Q11; the D pole of the field effect transistor Q10 is connected to the S pole of the field effect transistor Q11 through a resistor 41, and the D pole of the field effect transistor Q10 is connected to the negative pole of the Zener diode TVS1 through a resistor R40; The anode of the Zener diode TVS1 is connected to the D pole of the field effect transistor Q11, and the G pole of the field effect transistor Q11 is connected between the resistor R40 and the resistor R41; The PWM circuit includes a SC8886 voltage conversion chip, an inductor L1, a field effect transistor Q3, a field effect transistor Q4, a field effect transistor Q5 and a field effect transistor Q6; the D pole of the field effect transistor Q3 is connected to the field effect transistor Q6 through the inductor L1 The D pole of the field effect transistor Q3 is connected to the S pole of the field effect transistor Q4, and the D pole of the field effect transistor Q6 is connected to the S pole of the field effect transistor Q5; The G pole and the G pole of the field effect transistor Q4, the G pole of the field effect transistor Q5, and the G pole of the field effect transistor Q6 are respectively connected to the SC8886 voltage conversion chip; the S pole of the field effect transistor Q3 is connected to the S pole of the field effect transistor Q6 The MCU 7 is connected to the 16 pins and 17 pins of the SC8886 voltage conversion chip through PIN3 and PIN4 to achieve the purpose of controlling the SC8886 voltage conversion chip; and through algorithm optimization, the SC8886 voltage conversion chip can always output the maximum power. 2. The solar energy storage control circuit according to claim 1, wherein the input detection and filter circuit includes an input detection unit and an input filter unit, one end of the input filter unit is connected to the overvoltage protection unit, and the input The other end of the filter unit is connected with the input detection unit. 3. The solar energy storage control circuit according to claim 2, wherein the input detection unit includes a resistor R10, a resistor R11, a resistor R12, a capacitor C8, and a capacitor C9; one end of the resistor R10 is connected to the input filter unit The other end of the resistor R10 is connected to the D pole of the field effect transistor Q4; one end of the resistor R10 is connected to the pin 3 of the SC8886 voltage conversion chip through the resistor R11, and the other end of the resistor R10 is connected through the resistor R12 is connected to pin 2 of the SC8886 voltage conversion chip; one end of the resistor R11 connected to the SC8886 voltage conversion chip is grounded through a capacitor C8; one end of the resistor R12 connected to the SC8886 voltage conversion chip is grounded through a capacitor C9. 4. The solar energy storage control circuit according to claim 2, wherein the output detection and protection circuit comprises: an output detection unit and a protection unit, one end of the protection unit is connected to D of the field effect transistor Q5 pole connection, the other end of the protection unit is connected to the output detection unit; the output detection unit is connected to one end of the filter circuit; The output detection unit includes: a resistor R19, a resistor R20, a resistor R21 and a capacitor C22; the positive pole of the resistor R19 is connected to the 20 pin of the SC8886 voltage conversion chip through the resistor R20; the negative pole of the resistor R19 is connected to the SC8886 voltage through the resistor R21 Pin 19 of the conversion chip is connected; a capacitor C22 is connected between the positive pole of the resistor R20 and the positive pole of the resistor R21. 5. The solar energy storage control circuit according to claim 4, wherein the input sampling unit includes a capacitor C25 and a resistor R22, the positive pole of the resistor R22 is connected to the negative pole of the resistor R10; the negative pole of the resistor R22 is Connect pin 1 of the SC8886 voltage conversion chip, and the negative pole of the resistor R22 is grounded through the capacitor C25; The output sampling unit includes a capacitor C28, one end of the capacitor C28 is grounded, and the other end is connected to the pin 22 of the SC8886 voltage conversion chip and the D pole of the field effect transistor Q5. 6. The solar energy storage control circuit according to claim 4, wherein the filter circuit includes a capacitor C23 and a capacitor C24, the capacitor C23 and the capacitor C24 are connected in parallel, and one end of the capacitor C23 and the capacitor C24 is connected in parallel It is connected with the negative electrode of the resistor R19, and the other end of the parallel connection of the capacitor C23 and the capacitor C24 is grounded.

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