CN217427704U - Photovoltaic power generation energy storage control circuit - Google Patents

Abstract

The utility model relates to a photovoltaic power generation energy storage control circuit, which comprises a constant current control circuit, a voltage limiting control circuit and a current limiting switch circuit; the current limiting switch circuit is connected in series with the electric energy output end of an external solar energy drop/boost circuit and a battery. It is used to limit the charging current to the battery; both the constant current control circuit and the voltage limiting control circuit are connected to the current limiting switch circuit and the battery; the constant current control circuit intelligently controls the current limiting switch circuit according to the voltage of the battery to adjust the charging current to the battery The voltage limiting control circuit controls the current limiting switch circuit to charge or stop charging the battery according to the voltage of the battery; and the voltage reference circuit provides the reference voltage for the constant current control circuit, the voltage limiting control circuit and the charging state display circuit; and also through the charging state The display circuit displays the charging state of the battery; thus, the battery can be charged with constant current and voltage limiting, so as to protect the battery and improve the service life of the battery.

Description

A photovoltaic power generation energy storage control circuit

technical field

The utility model relates to the technical field of energy storage control, in particular to a photovoltaic power generation energy storage control circuit.

Background technique

Most of the existing photovoltaic charging circuits only step up or step down to charge the battery, and most of them do not perform charging and energy storage control, which often causes great damage to the battery and overcharge, which seriously affects the service life of the battery. .

Utility model content

The technical problem to be solved by the present invention is to provide a photovoltaic power generation energy storage control circuit with simple circuit, low cost and small volume, aiming at the above-mentioned defects of the prior art.

The technical scheme adopted by the utility model to solve its technical problems is:

A photovoltaic power generation energy storage control circuit is constructed, including a constant current control circuit, a voltage limiting control circuit and a current limiting switch circuit; wherein, the current limiting switch circuit is connected in series with the electric energy output end of an external solar buck/boost circuit and the battery used to limit the charging current to the battery;

The constant current control circuit intelligently controls the current limiting switch circuit to adjust the charging current of the battery according to the voltage of the battery;

The voltage limiting control circuit controls the current limiting switch circuit to charge or stop charging the battery according to the voltage of the battery;

The constant current control circuit and the voltage limiting control circuit are both connected to the current limiting switch circuit and the battery;

Also includes a charge state display circuit and a voltage reference circuit, the charge state display circuit is used to display the charge state of the battery, the voltage reference circuit is used for the constant current control circuit and the voltage limiting control circuit and the charging state display circuit provides a reference voltage;

The constant current control circuit, the voltage limiting control circuit and the charging state display circuit are all connected to the voltage reference circuit; the voltage reference circuit is connected to the power output end of the external solar power drop/boost circuit .

In the photovoltaic power generation energy storage control circuit of the utility model, the voltage reference circuit comprises: a three-terminal voltage stabilizer tube and a first diode;

The positive pole of the first diode is connected to the positive terminal of the power output terminal of the external solar buck/boost circuit, and the negative pole is connected to the VIN terminal of the three-terminal voltage regulator. The VOUT terminal is the output terminal of the voltage reference circuit;

The negative terminal of the electric energy output terminal of the external solar energy buck/boost circuit is grounded, and the GND terminal of the three-terminal voltage regulator is also grounded.

In the photovoltaic power generation energy storage control circuit of the utility model, the current limiting switch circuit comprises: a first transistor, a second transistor, a third transistor, a second diode and a third diode ;

The anode of the second diode is connected to the anode of the power output terminal of the external solar buck/boost circuit, and the cathode is connected to the emitter of the first triode, the first triode The collector of the tube is connected to the collector of the second triode and is also connected to the positive pole of the battery, and the negative pole of the battery is grounded;

The emitter of the second triode is connected with the base of the first triode and is also connected with a first capacitor, the base of the second triode is connected with a first resistor, the first Both the capacitor and the other end of the first resistor are connected to the collector of the third triode;

The emitter of the third transistor is grounded and the base is connected to the negative electrode of the third diode and is also connected to a second resistor, the other end of the second resistor is grounded, and the third diode is connected to the ground. The positive pole is the control terminal of the current-limiting switch circuit and is respectively connected to the constant-current control circuit and the voltage-limiting control circuit, and is also connected to a second capacitor, and the other end of the second capacitor is grounded.

The photovoltaic power generation energy storage control circuit of the utility model further comprises: a voltage dividing unit; the voltage dividing unit includes a third resistor and a fourth resistor;

A fifth resistor is connected to the positive pole of the battery, the other end of the fifth resistor is connected to the third resistor, the other end of the third resistor is connected to the fourth resistor, and the other end of the fourth resistor is grounded ;

The other end of the third resistor is the voltage dividing output end of the voltage dividing unit, which is respectively connected to the constant current control circuit and the voltage limiting control circuit.

In the photovoltaic power generation energy storage control circuit of the utility model, the constant current control circuit comprises: a first operational amplifier, a second operational amplifier, a fourth triode, a sixth resistor and an adjustable resistor;

The 1 pin of the adjustable resistor is connected with the output end of the voltage reference circuit and the 3 pin is connected with the reverse input end of the first operational amplifier and is also connected with the charging state display circuit;

The non-inverting input end of the first operational amplifier is connected to the voltage dividing output end of the voltage dividing unit and the output end is connected to the base electrode of the fourth triode, and the output end of the voltage reference circuit is also connected with a the seventh resistor, the eighth resistor and the sixth resistor; the other end of the seventh resistor is connected to the collector of the fourth triode, and the other end of the eighth resistor is connected to the fourth triode The base of the transistor is connected, and the other end of the sixth resistor is connected to the non-inverting input terminal of the second operational amplifier; the emitter of the fourth transistor is also connected to the non-inverting input of the second operational amplifier The end is connected and also connected with a ninth resistor, and the other end of the ninth resistor is grounded;

The reverse input end of the second operational amplifier is connected with a tenth resistor, an eleventh resistor and a third capacitor, and the other end of the tenth resistor is connected with the negative electrode of the battery and is also connected with a twelfth resistor, The other end of the twelfth resistor is grounded; the other ends of the eleventh resistor and the third capacitor are both connected to the output end of the second operational amplifier, and the output end of the second operational amplifier is also connected to The control terminal of the current limiting switch circuit is connected.

In the photovoltaic power generation energy storage control circuit of the present invention, the control end of the current limiting switch circuit is further connected with a thirteenth resistor, and the other end of the thirteenth resistor is connected with the negative electrode of the second diode .

In the photovoltaic power generation energy storage control circuit of the utility model, the voltage limiting control circuit comprises: a third operational amplifier;

The inverting input end of the third operational amplifier is connected with a fourteenth resistor and a fifteenth resistor, and the other end of the fourteenth resistor is connected with the voltage dividing output end of the voltage dividing unit. the other end of the resistor is connected to the output end of the third operational amplifier;

A sixteenth resistor is also connected to the non-inverting input end of the third operational amplifier, and the other end of the sixteenth resistor is connected to pin 2 of the adjustable resistor.

In the photovoltaic power generation energy storage control circuit of the utility model, the charging state display circuit comprises: a fourth operational amplifier, a first light emitting diode, a seventeenth resistor and an eighteenth resistor;

The seventeenth resistor and the eighteenth resistor are both connected to the same-direction input end of the fourth operational amplifier, and the other end of the seventeenth resistor is connected to the 3-pin of the adjustable resistor, so the The other end of the eighteenth resistor is grounded; the reverse input end of the fourth operational amplifier is also grounded;

The positive electrode of the first light-emitting diode is connected to the output end of the voltage reference circuit, and the negative electrode is connected to a nineteenth resistor, and the other end of the nineteenth resistor is connected to the output end of the fourth operational amplifier.

In the photovoltaic power generation energy storage control circuit of the utility model, the charging state display circuit further comprises: a second light-emitting diode and a twentieth resistor;

The anode of the second light emitting diode is connected to the cathode of the second diode and the cathode is connected to the twentieth resistor, and the other port of the twentieth resistor is grounded.

The beneficial effects of the utility model are: the constant current control circuit intelligently controls the current-limiting switch circuit according to the voltage of the battery to adjust the charging current of the battery; the voltage-limiting control circuit controls the current-limiting switch circuit to charge or stop charging the battery according to the voltage of the battery ; And the voltage reference circuit provides the reference voltage for the constant current control circuit, the voltage limiting control circuit and the charging state display circuit; and also displays the charging state of the battery through the charging state display circuit; thus realizing the constant current and voltage limiting charging of the battery, In order to protect the battery and improve the service life of the battery.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the present utility model will be further described below with reference to the accompanying drawings and embodiments. The accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings:

FIG. 1 is a circuit schematic diagram of a photovoltaic power generation energy storage control circuit according to a preferred embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the following will describe clearly and completely the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are part of the implementation of the present utility model. examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The photovoltaic power generation energy storage control circuit of the preferred embodiment of the present invention is shown in FIG. 1; it includes a constant current control circuit 100, a voltage limiting control circuit 200 and a current limiting switch circuit 300; the current limiting switch circuit 300 is connected in series with the external solar energy drop / Between the power output terminal of the booster circuit and the battery (not shown in the figure) is used to limit the charging current to the battery;

The constant current control circuit 100 intelligently controls the current limiting switch circuit 300 according to the voltage of the battery to adjust the charging current of the battery;

The voltage limiting control circuit 200 controls the current limiting switch circuit 300 to charge or stop charging the battery according to the voltage of the battery;

The constant current control circuit 100 and the voltage limiting control circuit 200 are both connected to the current limiting switch circuit 300 and the battery;

It also includes a charging state display circuit 400 and a voltage reference circuit 500, the charging state display circuit 400 is used to display the charging state of the battery, and the voltage reference circuit 500 is used for the constant current control circuit 100, the voltage limiting control circuit 200 and the charging state display circuit. 400 provides the reference voltage;

The constant current control circuit 100, the voltage limiting control circuit 200, and the charging state display circuit 400 are all connected to the voltage reference circuit 500; the voltage reference circuit 500 is connected to the power output end of the external solar buck/boost circuit;

The constant current control circuit 100 intelligently controls the current limiting switch circuit 300 to adjust the charging current to the battery according to the voltage of the battery; the voltage limiting control circuit 200 controls the current limiting switch circuit 300 to charge or stop charging the battery according to the voltage of the battery; and the voltage reference The circuit 500 provides a reference voltage for the constant current control circuit 100, the voltage limiting control circuit 200 and the charging state display circuit 400; and also displays the charging state of the battery through the charging state display circuit 400; thereby realizing the constant current and voltage limiting charging of the battery , to protect the battery and improve the service life of the battery.

As shown in FIG. 1 , the voltage reference circuit 500 includes: a three-terminal voltage regulator tube U1 and a first diode D3;

The positive pole of the first diode D3 is connected to the positive terminal of the power output terminal of the external solar buck/boost circuit, and the negative pole is connected to the VIN terminal of the three-terminal regulator, and the VOUT terminal of the three-terminal regulator U1 is the voltage reference the output of circuit 500;

The negative terminal of the electric energy output terminal of the external solar buck/boost circuit is grounded, and the GND terminal of the three-terminal voltage regulator tube U1 is also grounded; the circuit is simple, the cost is low, and the volume is small.

As shown in FIG. 1 , the current limiting switch circuit 300 includes: a first transistor T1, a second transistor T2, a third transistor T3, a second diode D1 and a third diode D5;

The anode of the second diode D1 is connected to the anode of the power output terminal of the external solar buck/boost circuit (or directly connected to the anode output terminal of the solar power panel, wherein the power generation voltage of the solar panel needs to be in line with the voltage of the battery) Matching, the negative output end of the solar power panel is grounded) and the negative electrode is connected to the emitter of the first triode T1, the collector of the first triode T1 is connected to the collector of the second triode T2 and is also connected to the battery’s The positive pole is connected, and the negative pole of the battery is grounded; the negative pole of the power output terminal of the external solar power drop/boost circuit is grounded;

The emitter of the second transistor T2 is connected to the base of the first transistor T1 and is also connected to the first capacitor C6, the base of the second transistor T2 is connected to the first resistor R1, the first capacitor C6 and the The other end of the first resistor R1 is connected to the collector of the third transistor T3;

The emitter of the third transistor T3 is grounded and the base is connected to the negative electrode of the third diode D5 and is also connected to a second resistor R11, the other end of the second resistor R11 is grounded, and the positive electrode of the third diode D5 is limited The control end of the current switch circuit 300 is respectively connected with the constant current control circuit 100 and the voltage limiting control circuit 200, and is also connected with a second capacitor C5, and the other end of the second capacitor C5 is grounded; the circuit is simple, the cost is low, and the volume is small.

As shown in FIG. 1, it further includes: a voltage dividing unit 600; the voltage dividing unit 600 includes a third resistor R3 and a fourth resistor R4;

A fifth resistor R2 is connected to the positive pole of the battery, the other end of the fifth resistor R2 is connected to the third resistor R3, the other end of the third resistor R3 is connected to the fourth resistor R4, and the other end of the fourth resistor R4 is grounded;

The other end of the third resistor R3 is the voltage dividing output end of the voltage dividing unit 600, which is respectively connected to the constant current control circuit 100 and the voltage limiting control circuit 200; the circuit is simple, the cost is low, and the volume is small.

As shown in FIG. 1 , the constant current control circuit 100 includes: a first operational amplifier U1C, a second operational amplifier U1D, a fourth transistor T4, a sixth resistor R17 and an adjustable resistor RV1;

The 1 pin of the adjustable resistor RV1 is connected with the output end of the voltage reference circuit 500 and the 3 pin is connected with the inverting input end of the first operational amplifier U1C and is also connected with the charging state display circuit 400;

The non-inverting input end of the first operational amplifier U1C is connected to the voltage dividing output end of the voltage dividing unit 600 and the output end is connected to the base electrode of the fourth transistor T4, and the output end of the voltage reference circuit 500 is also connected to a seventh resistor R18 and the eighth resistor R19 and the sixth resistor R17; the other end of the seventh resistor R18 is connected to the collector of the fourth transistor T4, the other end of the eighth resistor R19 is connected to the base of the fourth transistor T4, and the third The other end of the six resistors R17 is connected to the non-directional input terminal of the second operational amplifier U1D; the emitter of the fourth transistor T4 is also connected to the non-directional input terminal of the second operational amplifier U1D and is also connected to the ninth resistor R16, The other end of the ninth resistor R16 is grounded;

The inverting input end of the second operational amplifier U1D is connected with the tenth resistor R15, the eleventh resistor R14 and the third capacitor C4, the other end of the tenth resistor R15 is connected with the negative electrode of the battery and is also connected with the twelfth resistor R12, The other end of the twelfth resistor R12 is grounded; the other ends of the eleventh resistor R14 and the third capacitor C4 are both connected to the output end of the second operational amplifier U1D, and the output end of the second operational amplifier U1D is also connected to the current limiting switch circuit 300 control terminal connection;

When the voltage of the battery is lower than 9V, the photovoltaic power generation energy storage control circuit works in a small current maintenance charging state. Low potential, the fourth transistor T4 is turned off, the potential of the non-inverting input terminal of the second operational amplifier U1D is about 0.18V, at this time, the current limiting switch circuit 300 is controlled (controlled by the constant current control circuit 100) The charging current of the battery is about 250mA ;

As the maintenance charging continues, the voltage of the battery gradually increases. When the voltage of the battery exceeds 9V, the photovoltaic power generation energy storage control circuit switches to the high-current fast charging mode. At this time, the potential of the non-inverting input terminal of the first operational amplifier U1C is higher than Invert the potential of the input terminal, the output terminal outputs a high potential, the fourth transistor T4 is turned on, and the potential of the non-inverting input terminal of the second operational amplifier U1D is about 0.48V. At this time, the control (controlled by the constant current control circuit 100) is limited. The current switching circuit 300 constantly charges the battery with a charging current of about 1A.

As shown in FIG. 1 , the control end of the current limiting switch circuit 300 is also connected with a thirteenth resistor R10, and the other end of the thirteenth resistor R10 is connected with the negative electrode of the second diode D1; so as to realize that after the battery is fully charged The charging current of the control current limiting switch circuit 300 to the battery is only 10-30 mA, which is used to supplement the power lost by the battery due to self-discharge.

As shown in FIG. 1 , the voltage limiting control circuit 200 includes: a third operational amplifier U1B;

The inverting input end of the third operational amplifier U1B is connected with a fourteenth resistor R7 and a fifteenth resistor R9, and the other end of the fourteenth resistor R7 is connected with the voltage dividing output end of the voltage dividing unit 600. The other end is connected to the output end of the third operational amplifier U1B;

A sixteenth resistor R8 is also connected to the non-inverting input end of the third operational amplifier U1B, and the other end of the sixteenth resistor R8 is connected to the 2 pin of the adjustable resistor RV1; wherein, the adjustable resistor RV1 is used to adjust the voltage limiting charging voltage/float voltage;

When the power of the battery is close to fully charged, the photovoltaic power generation energy storage control circuit automatically switches to the voltage-limited floating charging state (the voltage-limiting floating charging voltage is set to 13.8V), and the charging current at this time will gradually decrease from the fast charging state. After the battery is fully charged, the current limiting switch circuit 300 is controlled (controlled by the voltage limiting control circuit 200) to disconnect the charging of the battery.

As shown in FIG. 1 , the charging state display circuit 400 includes: a fourth operational amplifier U1A, a first light-emitting diode D7, a seventeenth resistor R5 and an eighteenth resistor R6;

The seventeenth resistor R5 and the eighteenth resistor R6 are both connected to the non-inverting input terminal of the fourth operational amplifier U1A, the other end of the seventeenth resistor R5 is connected to the 3 pin of the adjustable resistor RV1, and the eighteenth resistor R6 The other end is grounded; the reverse input terminal of the fourth operational amplifier U1A is also grounded;

The positive pole of the first light-emitting diode D7 is connected to the output terminal of the voltage reference circuit 500 and the negative pole is connected to a nineteenth resistor R13, and the other end of the nineteenth resistor R13 is connected to the output terminal of the fourth operational amplifier U1A; during charging, the first The light-emitting diode D7 lights up, and goes out after entering the floating state, indicating that the charging is over.

As shown in FIG. 1 , the charging state display circuit 400 further includes: a second light emitting diode (not shown in the figure) and a twentieth resistor (not shown in the figure);

The anode of the second light-emitting diode is connected to the cathode of the second diode D1 and the cathode is connected to the twentieth resistor, and the other port of the twentieth resistor is grounded; it is used to display the power input status of the upper-level circuit to the photovoltaic power generation energy storage control circuit .

It should be understood that, for those skilled in the art, improvements or transformations can be made according to the above description, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.

Claims (9)

1. A photovoltaic power generation energy storage control circuit, comprising a constant-current control circuit, a voltage-limiting control circuit and a current-limiting switch circuit; it is characterized in that, the current-limiting switch circuit is connected in series with the power output of an external solar buck/boost circuit between the terminal and the battery to limit the charging current to the battery; The constant current control circuit intelligently controls the current limiting switch circuit to adjust the charging current of the battery according to the voltage of the battery; The voltage limiting control circuit controls the current limiting switch circuit to charge or stop charging the battery according to the voltage of the battery; The constant current control circuit and the voltage limiting control circuit are both connected to the current limiting switch circuit and the battery; Also includes a charge state display circuit and a voltage reference circuit, the charge state display circuit is used to display the charge state of the battery, the voltage reference circuit is used for the constant current control circuit and the voltage limiting control circuit and the charging state display circuit provides a reference voltage; The constant current control circuit, the voltage limiting control circuit and the charging state display circuit are all connected to the voltage reference circuit; the voltage reference circuit is connected to the power output end of the external solar power drop/boost circuit . 2 . The photovoltaic power generation energy storage control circuit according to claim 1 , wherein the voltage reference circuit comprises: a three-terminal voltage regulator and a first diode; 2 . The positive pole of the first diode is connected to the positive terminal of the power output terminal of the external solar buck/boost circuit, and the negative pole is connected to the VIN terminal of the three-terminal voltage regulator. The VOUT terminal is the output terminal of the voltage reference circuit; The negative terminal of the electric energy output terminal of the external solar energy buck/boost circuit is grounded, and the GND terminal of the three-terminal voltage regulator is also grounded. 3. The photovoltaic power generation energy storage control circuit according to claim 2, wherein the current limiting switch circuit comprises: a first transistor, a second transistor, a third transistor and a second diode tube and a third diode; The anode of the second diode is connected to the anode of the power output terminal of the external solar buck/boost circuit, and the cathode is connected to the emitter of the first triode. The collector is connected to the collector of the second triode and is also connected to the positive electrode of the battery, and the negative electrode of the battery is grounded; The emitter of the second triode is connected with the base of the first triode and is also connected with a first capacitor, the base of the second triode is connected with a first resistor, the first Both the capacitor and the other end of the first resistor are connected to the collector of the third triode; The emitter of the third transistor is grounded and the base is connected to the negative electrode of the third diode and is also connected to a second resistor, the other end of the second resistor is grounded, and the third diode is connected to the ground. The positive pole is the control terminal of the current-limiting switch circuit and is respectively connected to the constant-current control circuit and the voltage-limiting control circuit, and is also connected to a second capacitor, and the other end of the second capacitor is grounded. 4 . The photovoltaic power generation energy storage control circuit according to claim 3 , further comprising: a voltage dividing unit; the voltage dividing unit comprises a third resistor and a fourth resistor; 5 . A fifth resistor is connected to the positive pole of the battery, the other end of the fifth resistor is connected to the third resistor, the other end of the third resistor is connected to the fourth resistor, and the other end of the fourth resistor is grounded ; The other end of the third resistor is the voltage dividing output end of the voltage dividing unit, which is respectively connected to the constant current control circuit and the voltage limiting control circuit. 5 . The photovoltaic power generation energy storage control circuit according to claim 4 , wherein the constant current control circuit comprises: a first operational amplifier, a second operational amplifier, a fourth transistor and a sixth resistor and adjustable resistance; The 1 pin of the adjustable resistor is connected with the output end of the voltage reference circuit and the 3 pin is connected with the reverse input end of the first operational amplifier and is also connected with the charging state display circuit; The non-inverting input end of the first operational amplifier is connected to the voltage dividing output end of the voltage dividing unit and the output end is connected to the base electrode of the fourth triode, and the output end of the voltage reference circuit is also connected with a the seventh resistor, the eighth resistor and the sixth resistor; the other end of the seventh resistor is connected to the collector of the fourth triode, and the other end of the eighth resistor is connected to the fourth triode The base of the transistor is connected, and the other end of the sixth resistor is connected to the non-inverting input terminal of the second operational amplifier; the emitter of the fourth transistor is also connected to the non-inverting input of the second operational amplifier The end is connected and also connected with a ninth resistor, and the other end of the ninth resistor is grounded; The reverse input end of the second operational amplifier is connected with a tenth resistor, an eleventh resistor and a third capacitor, and the other end of the tenth resistor is connected with the negative electrode of the battery and is also connected with a twelfth resistor, The other end of the twelfth resistor is grounded; the other ends of the eleventh resistor and the third capacitor are both connected to the output end of the second operational amplifier, and the output end of the second operational amplifier is also connected to The control terminal of the current limiting switch circuit is connected. 6 . The photovoltaic power generation energy storage control circuit according to claim 5 , wherein the control end of the current limiting switch circuit is further connected with a thirteenth resistor, and the other end of the thirteenth resistor is connected to the thirteenth resistor. 7 . The negative poles of the two diodes are connected. 7 . The photovoltaic power generation energy storage control circuit according to claim 5 , wherein the voltage limiting control circuit comprises: a third operational amplifier; 7 . The inverting input end of the third operational amplifier is connected with a fourteenth resistor and a fifteenth resistor, and the other end of the fourteenth resistor is connected with the voltage dividing output end of the voltage dividing unit. The other end of the resistor is connected to the output end of the third operational amplifier; A sixteenth resistor is also connected to the non-inverting input end of the third operational amplifier, and the other end of the sixteenth resistor is connected to pin 2 of the adjustable resistor. 8. The photovoltaic power generation energy storage control circuit according to claim 5, wherein the charging state display circuit comprises: a fourth operational amplifier, a first light emitting diode, a seventeenth resistor and an eighteenth resistor; The seventeenth resistor and the eighteenth resistor are both connected to the same-direction input end of the fourth operational amplifier, and the other end of the seventeenth resistor is connected to the 3-pin of the adjustable resistor, so the The other end of the eighteenth resistor is grounded; the reverse input end of the fourth operational amplifier is also grounded; The positive electrode of the first light-emitting diode is connected to the output end of the voltage reference circuit, and the negative electrode is connected to a nineteenth resistor, and the other end of the nineteenth resistor is connected to the output end of the fourth operational amplifier. 9 . The photovoltaic power generation energy storage control circuit according to claim 3 , wherein the charging state display circuit further comprises: a second light-emitting diode and a twentieth resistor; 10 . The anode of the second light emitting diode is connected to the cathode of the second diode and the cathode is connected to the twentieth resistor, and the other port of the twentieth resistor is grounded.

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