CN213243577U

CN213243577U - Input constant-current light-operated booster circuit

Info

Publication number: CN213243577U
Application number: CN202021574040.4U
Authority: CN
Inventors: 陈长兴; 班福奎; 杨义凯
Original assignee: Shanghai Shiningic Electronic Technology Co ltd
Current assignee: Shanghai Shiningic Electronic Technology Co ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-05-18
Anticipated expiration: 2030-07-31

Abstract

An input constant-current light-operated booster circuit comprises a chip internal circuit and a peripheral circuit, wherein the chip internal circuit comprises a booster circuit, a solar charging control circuit, a battery low-power turn-off circuit, an enabling circuit, a driving circuit, a PFM control circuit, a PMOS transistor MP1, a PMOS transistor MP2, an NMOS transistor MN1 and a power supply switching circuit; the peripheral circuit only comprises an inductor L, a battery and a capacitor Cout which are required by the circuit boosting and a solar panel solar which is required by the solar light control. The utility model discloses a solar charging management is realized to solar charging control circuit, through the low electric quantity turn-off circuit of battery and enable control circuit control boost circuit open and close, the power supply switching circuit that especially increases can turn-off output voltage thoroughly when enabling control and light-operated charging. The utility model discloses the effectual loss of its electric quantity when having solved battery powered and reducing gradually, improvement battery live time that can be great improves the input wide range application through thoroughly turn-off output voltage simultaneously.

Description

Input constant-current light-operated booster circuit

Technical Field

The utility model belongs to the technical field of lighting circuit, a light-operated boost circuit of input constant current is related to.

Background

Under the big environment of green life advocated at present, outdoor lighting such as park, square, outdoor advertising lamp uses and begins to adopt solar energy supplementary energy and control mode generally, can not only make full use of present sustainable energy, has also saved the consumption of traditional energy simultaneously greatly, has reduced the emission of pollution. In practical applications, the LEDs such as lawn lamps and light strings often need to be powered more than their on-state voltage, which requires a boosting function when powered by a solar cell.

The LED controller circuit with the boosting function widely applied to the market mainly comprises the following circuit forms: a constant current control circuit, a constant voltage control circuit and the like. It is clear to those skilled in the art of solar lighting circuits that when a constant voltage circuit is operated, the output voltage is constant and specific, and although the LED load can be guaranteed to be constant in brightness all the time, the input current is larger and larger as the battery power decreases and the energy conservation is maintained, so that the battery voltage is powered down more and more quickly. This allows the input constant current application to be further developed, which is more convenient in calculating power consumption and battery life time and easier to determine the charging current due to the constant input current, thereby realizing charge-discharge balance.

However, as the output-off battery is adjusted back due to over-discharge, the boost circuit starts to operate again. This causes the output to be high or low after the battery power is low, and especially, when the constant current control circuit controls the LED load to work, the phenomenon becomes more obvious, which makes the battery low power detection and turn-off more important.

Specifically, when solar light accuse is stepped up and is used, when adopting two solar energy dry battery or lithium cell that establish ties, output voltage is the same with input voltage after the solar charging, and LED turn-on voltage is less than two dry battery and lithium cell voltage, this LED load is bright when will leading to solar charging, this phenomenon not only is not conform to customer's custom, the resource has also been wasted simultaneously, consequently, be applied to products such as lawn lamp, solar lamp cluster in the market often can meet the application and be restricted, under the condition of no external turn-off circuit, the solar charging that only can be used to a battery is stepped up and is used.

In addition, the conventional solar light-operated booster circuit is often formed by a booster chip, a solar charging control circuit and other circuits, so that the area of a PCB (printed circuit board) and the number of peripheral tubes are increased in the practical application process of a client, and the practical use cost is greatly increased.

Disclosure of Invention

The utility model aims to solve the technical problem mainly lie in providing a brand-new light-operated boost circuit of input constant current, not only solved the unstable condition of voltage in the solar charging steps up, can also reduce the quantity of PCB face area and peripheral pipe, great saving the consumption to energy saving and emission reduction's purpose has also been realized.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

an input constant-current light-operated booster circuit comprises a chip internal circuit and a peripheral circuit; the peripheral circuit comprises an inductor L, a solar panel solar, a battery and an output capacitor Cout; the chip internal circuit comprises a booster circuit, a solar charging control circuit, a PFM control circuit, a PMOS transistor MP1, a PMOS transistor MP2, an NMOS transistor MN1, a drive circuit and a power supply switching circuit; the solar panel solar is connected between a pin SOL and a ground terminal GND, the output capacitor Cout is connected between a power supply VDD and the ground terminal GND, the solar charging control circuit comprises a first input end, a second input end, a third input end, a first output end, a second output end and a third output end, the first input end and a source electrode of the PMOS transistor MP2 are connected with the pin BAT, the second input end and a drain electrode of the PMOS transistor MP2 are connected with the pin SOL, the third input end is connected with the PFM control circuit, the first output end is connected with a grid electrode of the PMOS transistor MP2, and the second output end and the third output end are respectively connected with the driving circuit and provide an enable signal EN1 for the power supply switching circuit; the driving circuit comprises a first input end, a second input end, a first output end and a second output end, the power supply switching circuit comprises a first input end, a second input end, a first output end and a second output end, the first output end and the second output end are connected with the grids of the PMOS transistor MP1 and the NMOS transistor MN1, the drains of the PMOS transistor MP1 and the NMOS transistor MN1 are connected with the pin LX, the source of the PMOS transistor MP1 is connected with the first output end of the power supply switching circuit, the second output end of the power supply switching circuit is connected with the power supply VDD, the first input end of the power supply switching circuit is connected with the ground terminal GND, the second input end of the power supply switching circuit is connected with the enable signal EN1, the inductor L is connected between the pin LX and the pin SOL, and the battery is connected between the pin SOL and the ground terminal GND;

the signal of the pin BAT and the signal of the pin SOL generate an enable signal EN1 through the solar charging control circuit, the output of the boost circuit is the same as the voltage of the power supply VDD under the normal work and no light control condition, and the output of the boost circuit is the same as the voltage of the ground terminal GND when the light control charging or the enabling is turned off.

Further, the input constant-current light-operated boost circuit further comprises an enable circuit, an input end of the enable circuit receives a signal received by a pin EN and outputs an enable signal EN2, and the power supply switching circuit further comprises a third input end, the third input end receives an enable signal EN2 and supplies the enable signal EN and the ground terminal GND signal to the power supply switching circuit so as to output the voltage of the power supply VDD or the voltage of the ground terminal GND.

Further, the power supply switching circuit includes a first switch key1, a second switch key2, a nor gate and an inverter; two input ends of the nor gate are respectively connected with the enable signal EN1 and the enable signal EN2, the first switch key1 is connected between an internal power supply pin VDD1 and the power supply VDD signal, and the second switch key2 is connected between the ground terminal GND signal and the power supply VDD signal; the nor gate controls the conduction of the first switch key1, the inverter controls the conduction of the first switch key2, and the output VDD is switched to the ground GND signal when the enable signal EN1 and the enable signal EN2 are turned off.

Furthermore, the input constant-current light-operated boost circuit further comprises a battery low-power turn-off circuit, the power supply switching circuit further comprises a fourth input end, the battery low-power turn-off circuit receives the pin BAT signal to generate a control signal CTL, the fourth input end receives the control signal CTL, and when the pin BAT signal indicates that the battery power is insufficient, the power supply switching circuit generates a turn-off signal; the signal of the pin LX, the enable signal EN1 and the control signal CTL generate the internal power supply pin VDD1 signal through the voltage boosting circuit and supply the internal power supply pin VDD1 signal to the power supply switching circuit so as to output the power supply VDD signal.

Further, the low battery power shutdown circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a MOS transistor 3, a MOS transistor 4, and a schmitt trigger, wherein the resistor R8, the resistor R9, and the resistor R10 are sequentially connected in series between the pin BAT and the ground terminal GND, and the resistor R11 is connected to the internal power supply pin vdd1 and an input end of the schmitt trigger; the grid electrode of the MOS transistor 3 is connected with the connection point of the resistor R8 and the resistor R9, the drain electrode is connected with the input end of the Schmitt trigger, and the source electrode is connected with the grounding end GND; the grid of the MOS transistor 4 is connected with the output end of the Schmitt trigger, the drain of the MOS transistor 4 is connected with the connection point of the resistor R9 and the resistor R10, and the source of the MOS transistor 4 is connected with the ground end GND; the output of the schmitt trigger outputs the control signal CTL.

Further, the MOS transistor 3 and the MOS transistor 4 are NMOS transistors.

Further, the boost circuit comprises a resistor R1, a resistor R2, a resistor R3, an operational amplifier and a MOS transistor MN0, wherein the resistor R1, the resistor R2 and the resistor R3 are sequentially connected in series between the pin BAT and the ground terminal GND, the anode of the operational amplifier is connected to the pin SOL, the cathode of the operational amplifier is connected to the connection point of the resistor R1 and the resistor R2, the drain of the MOS transistor MN0 is connected to the connection point of the resistor R2 and the resistor R3, and the source of the MOS transistor MN0 is connected to the ground terminal GND; the gate of the MOS transistor MN0 is connected with the output end of the operational amplifier; the output terminal of the operational amplifier outputs the enable signal EN 1.

Further, the solar charging control circuit comprises a resistor R4, a resistor R5, an operational amplifier and a MOS transistor MP0, wherein the resistor R4 and the resistor R5 are sequentially connected in series between the pin SOL and the ground terminal GND, the anode of the operational amplifier is connected with the pin BAT, the cathode of the operational amplifier is connected with the connection point of the resistor R4 and the resistor R5, the drain of the MOS transistor MP0 is connected with the pin SOL, and the source of the MOS transistor MP0 is connected with the pin BAT; the gate of the MOS transistor MP0 is connected to the output terminal of the operational amplifier.

According to the above technical scheme, the utility model discloses a light-operated boost circuit of input constant current provides the scheme that can effectively solve solar charging and constant current output voltage, and it realizes solar charging management through solar charging control circuit, turns off circuit, the opening and closing that enable control circuit controlled boost circuit through the battery low-power, has especially added power supply switching circuit, can turn off output voltage thoroughly when enabling control and light-operated charging. Therefore, the utility model discloses the effectual loss of its electric quantity when having solved battery powered and reducing gradually, improvement battery live time that can be great improves the wide range application of input through thoroughly turn-off output voltage simultaneously. That is, the circuit can be used in a wide operating voltage range, and when the supply voltage is higher than the internally set minimum operating threshold voltage, the output voltage can be ensured to be kept constant without being affected by the supply voltage.

Furthermore, the utility model provides a mode of constant voltage output has adopted the low-power consumption design, has guaranteed the life of battery under the output load state of charging or not receiving to great saving the energy, having added the enable and having shut off the function, can turn off the output completely when not needing the output load, great sparingly consumption has also solved the problem that output voltage relapse when the battery turn-offs the opening process simultaneously.

Drawings

Fig. 1 shows the embodiment of the present invention is a schematic block diagram of an input constant-current light-operated boost circuit

FIG. 2 is a schematic diagram of a specific circuit of the boost circuit in the embodiment of the present invention

FIG. 3 is a schematic diagram of a solar charging circuit according to an embodiment of the present invention

FIG. 4 is a schematic diagram of the low battery turn-off circuit in the embodiment of the present invention

FIG. 5 is a schematic diagram of a power supply switching circuit according to an embodiment of the present invention

Detailed Description

The following description of the present invention will be made in detail with reference to the accompanying drawings 1 to 5.

It should be noted that the utility model discloses be applied to in the solar light-operated boost circuit based on constant current control circuit, this constant current control circuit can be PWM (pulse width modulation) type control circuit, also can be PFM (pulse frequency modulation) type control circuit. In the embodiment of the present invention, a PFM (pulse frequency modulation) type control circuit is described as an example.

Referring to fig. 1, fig. 1 is a schematic block diagram of an input constant-current light-controlled boost circuit according to an embodiment of the present invention. As shown in fig. 1, the input constant-current optically-controlled boost circuit includes a chip internal circuit and a peripheral circuit; the peripheral circuit comprises an inductor L, a solar panel solar, a battery and an output capacitor Cout; the chip internal circuit comprises a booster circuit, a solar charging control circuit, a PFM control circuit, a PMOS transistor MP1, a PMOS transistor MP2, an NMOS transistor MN1, a drive circuit and a power supply switching circuit. That is, the utility model discloses all concentrate on a chip all functional module, this just makes the quantity that has reduced PCB board area and peripheral pipe in the practical application process. Most importantly, through increasing the power supply switching circuit, make the utility model discloses can be used for the operating voltage scope of broad, turn-off the circuit through increasing the battery low power, can be in the lower back of solar cell electric quantity, directly turn-off output has avoided LED lamp output the condition that luminance is suddenly high suddenly low to appear, through increasing enable circuit, makes the utility model discloses can make the user need not under the condition of solar energy LED lamp for a period, can ensure that this input constant current light-operated boost circuit is out of work.

As shown in fig. 1, in an embodiment of the present invention, the solar panel solar is connected between a pin SOL and a ground terminal GND, the output capacitor Cout is connected between a power supply VDD and the ground terminal GND, the solar charging control circuit includes a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal and a third output terminal, the first input terminal and a source of the PMOS transistor MP2 are connected to the pin BAT, the second input terminal and a drain of the PMOS transistor MP2 are connected to the pin SOL, the third input terminal is connected to the PFM control circuit, the first output terminal is connected to a gate of the PMOS transistor MP2, and the second output terminal and the third output terminal are respectively connected to the driving circuit and provide an enable signal EN1 for the power supply switching circuit; the drive circuit comprises a first input end, a second input end, a first output end and a second output end, the power supply switching circuit comprises a first input end, a second input end, a first output end and a second output end, the first output end and the second output end are connected with the grids of the PMOS transistor MP1 and the NMOS transistor MN1, the drains of the PMOS transistor MP1 and the NMOS transistor MN1 are connected with the pin LX, the source of the PMOS transistor MP1 is connected with the first output end of the power supply switching circuit, the second output end of the power supply switching circuit is connected with the power supply VDD, the power supply switching circuit comprises a first input end connected with the ground terminal GND and a second input end connected with the enable signal EN1, the inductor L is connected between the pin LX and the pin SOL, and the battery is connected between the pin SOL and the ground terminal GND.

That is, in the above embodiment, the enable signal EN1 and the voltage information of the ground terminal GND determine the output of the input constant current photo-controlled booster circuit; under the condition that the booster circuit works normally and no light control exists, the output of the booster circuit is the same as the voltage of the power supply VDD, and when the light control charging or the enabling is turned off, the output of the booster circuit is the same as the voltage of the ground end GND.

Referring to fig. 2, fig. 2 is a schematic diagram of a circuit for generating an enable signal EN1 according to an embodiment of the present invention. As shown in fig. 2, the boost circuit includes a resistor R1, a resistor R2, a resistor R3, an operational amplifier and a MOS transistor MN0, wherein the resistor R1, the resistor R2 and the resistor R3 are sequentially connected in series between the pin BAT and the ground terminal GND, the anode of the operational amplifier is connected to the pin SOL, the cathode of the operational amplifier is connected to the connection point of the resistor R1 and the resistor R2, the drain of the MOS transistor MN0 is connected to the connection point of the resistor R2 and the resistor R3, and the source of the MOS transistor MN0 is connected to the ground terminal GND; the gate of the MOS transistor MN0 is connected with the output end of the operational amplifier; the output terminal of the operational amplifier outputs the enable signal EN 1.

In the embodiment of the utility model, as the illumination becomes stronger

When the enable signal EN1 is high, the light control signal is detectedThe booster circuit can be controlled to be switched off, and the output power supply VDD is pulled to the grounding end GND through the power supply switching circuit; as the illumination becomes weaker

When the enable signal EN1 is low, the light control signal is detected to be invalid, and the booster circuit and the output power supply VDD can be restored. In the circuit, a charge delay is made through the NMOS transistor MN0, so that the critical state encountered during solar charging and discharging is prevented.

Referring to fig. 3, fig. 3 is a schematic circuit diagram of a solar charging circuit according to an embodiment of the present invention. As shown in the figure, the solar charging control circuit comprises a resistor R4, a resistor R5, an operational amplifier and a MOS transistor MP0, wherein the resistor R4 and the resistor R5 are sequentially connected in series between the pin SOL and the ground terminal GND, the anode of the operational amplifier is connected to the pin BAT, the cathode of the operational amplifier is connected to the connection point of the resistor R4 and the resistor R5, the drain of the MOS transistor MP0 is connected to the pin SOL, and the source of the MOS transistor MP0 is connected to the pin BAT; the gate of the MOS transistor MP0 is connected to the output terminal of the operational amplifier.

In the embodiment of the present invention, when

When the voltage of the gate of the PMOS transistor MP2 is low, the output information of the pin SOL charges the pin BAT; when in use

At this time, the gate voltage of the PMOS transistor MP2 is high, and the charging is ended.

It can be seen from the above that, through the above circuit, the level values of the pin BAT and the pin SOL can be detected, so as to obtain the result of whether the solar energy charges the battery, thereby implementing the solar charging management function.

Referring to fig. 1, as shown in the figure, the input constant current light-operated boost circuit further includes a low battery shutdown circuit, the low battery shutdown circuit receives the pin BAT signal to generate a control signal CTL, and when the pin BAT signal indicates that the battery capacity is insufficient, the power supply switching circuit generates a shutdown signal; the signal of the pin LX, the enable signal EN1 and the control signal CTL generate the internal power supply pin VDD1 signal through the voltage boost circuit and supply the signal to the power supply switching circuit, so as to output the voltage of the power supply VDD or the voltage of the ground GND.

Referring to fig. 4 in conjunction with fig. 1, fig. 4 is a schematic diagram illustrating a low-battery shutdown circuit according to an embodiment of the present invention. The low battery power turn-off circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a MOS transistor 3, a MOS transistor 4 and a Schmitt trigger, wherein the resistor R8, the resistor R9 and the resistor R10 are sequentially connected between the pin BAT and the ground terminal GND in series, and the resistor R11 is connected with the internal power supply pin vdd1 and the input end of the Schmitt trigger; the grid electrode of the MOS transistor 3 is connected with the connection point of the resistor R8 and the resistor R9, the drain electrode is connected with the input end of the Schmitt trigger, and the source electrode is connected with the grounding end GND; the grid of the MOS transistor 4 is connected with the output end of the Schmitt trigger, the drain of the MOS transistor 4 is connected with the connection point of the resistor R9 and the resistor R10, and the source of the MOS transistor 4 is connected with the ground end GND; the output of the schmitt trigger outputs the control signal CTL.

The low-battery turn-off circuit in the above embodiment operates on the principle that the boost circuit and the power supply switching circuit are controlled by the control signal CTL output from the voltage at the detection pin BAT. As the power supplied by the battery is gradually increased,

V_{TH_MN3}the voltage is the turn-on voltage of the NMOS transistor MN3, and the output control signal CTL at this time is low; as the battery operates, its supply voltage gradually decreases as

At this time, the control signal CTL output is high. Thereby passing through the detection leadThe voltage of the foot BAT controls the booster circuit and the output voltage. When the battery power displayed by the pin BAT is insufficient, the input constant-current light-operated boost circuit is turned off.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating a power supply switching circuit according to an embodiment of the present invention. As shown, the power switching circuit includes a first switch key1, a second switch key2, a nor gate, and an inverter; two input ends of the nor gate are respectively connected with the enable signal EN1 and an enable signal EN2, the first switch key1 is connected between the internal power supply pin VDD1 and the power supply VDD signal, and the second switch key2 is connected between the ground terminal GND signal and the power supply VDD signal; the nor gate controls the conduction of the first switch key1, the inverter controls the conduction of the first switch key2, and the output VDD is switched to the ground GND signal when the enable signal EN1 and the enable signal EN2 are turned off.

The working principle of the circuit is that under the condition that the booster circuit works normally and no light control exists, the output power supply VDD voltage is the same as the voltage of the internal power supply pin VDD1, and when the light control is charged or the enable is turned off, the voltage of the ground end GND is output. The output voltage can be effectively cut off through the power supply switching circuit. Above-mentioned technical scheme has solved the problem of this light-operated product that steps up in the existing market well, and when light-operated charging, its output voltage equals with input voltage, and this when input voltage is greater than LED and switches on threshold voltage, can make LED thoroughly turn-off when being applied to LED relevant product and use.

To sum up, the utility model discloses a this power supply switching circuit, this problem that can effectual solution on the market like product meet has not only expanded the width in the application scene, has also reduced the consumption of chip simultaneously.

What has just been said is the preferred embodiment of the present invention, the embodiment is not used for limiting the patent protection scope of the present invention, therefore all the equivalent structural changes made by the contents of the description and the drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. An input constant-current light-operated booster circuit is characterized by comprising a chip internal circuit and a peripheral circuit; the peripheral circuit comprises an inductor L, a solar panel solar, a battery and an output capacitor Cout; the chip internal circuit comprises a booster circuit, a solar charging control circuit, an enabling circuit, a PFM control circuit, a PMOS transistor MP1, a PMOS transistor MP2, an NMOS transistor MN1, a drive circuit and a power supply switching circuit; the solar panel solar is connected between a pin SOL and a ground terminal GND, the output capacitor Cout is connected between a power supply VDD and the ground terminal GND, the solar charging control circuit comprises a first input end, a second input end, a third input end, a first output end, a second output end and a third output end, the first input end and a source electrode of the PMOS transistor MP2 are connected with the pin BAT, the second input end and a drain electrode of the PMOS transistor MP2 are connected with the pin SOL, the third input end is connected with the PFM control circuit, the first output end is connected with a grid electrode of the PMOS transistor MP2, and the second output end and the third output end are respectively connected with the driving circuit and provide an enable signal EN1 for the power supply switching circuit; the driving circuit comprises a first input end, a second input end, a first output end and a second output end, the power supply switching circuit comprises a first input end, a second input end, a first output end and a second output end, the first output end and the second output end are connected with the grids of the PMOS transistor MP1 and the NMOS transistor MN1, the drains of the PMOS transistor MP1 and the NMOS transistor MN1 are connected with a pin LX, the source of the PMOS transistor MP1 is connected with the first output end of the power supply switching circuit, the second output end of the power supply switching circuit is connected with a power supply VDD, the first input end of the power supply switching circuit is connected with a ground terminal GND, the second input end of the power supply switching circuit is connected with an enable signal EN1, the inductor L is connected between the pin LX and the pin SOL, and the battery is connected between the pin SOL and the ground terminal GND;

the power supply switching circuit comprises a solar charging control circuit, an enable signal EN1, an enable signal EN2 and a third input end, wherein the signal BAT and the signal SOL are generated by the solar charging control circuit, the input end of the enable circuit receives the signal EN received by the pin EN and outputs the enable signal EN2, the power supply switching circuit further comprises the third input end, the third input end receives the enable signal EN2 and supplies the enable signal EN and the signal GND of the grounding end to the power supply switching circuit, the output of the power supply switching circuit is the same as the voltage of the power supply VDD under the conditions that the boosting circuit normally works and no light control exists, and when the light control charging or the enabling is turned off, the output voltage of the power supply VDD is the same as the voltage of the grounding end GN.

2. The input constant current photo-controlled booster circuit as claimed in claim 1, wherein said power supply switching circuit comprises a first switch key1, a second switch key2, a nor gate and an inverter; two input ends of the nor gate are respectively connected with the enable signal EN1 and the enable signal EN2, the first switch key1 is connected between an internal power supply pin VDD1 and the power supply VDD signal, and the second switch key2 is connected between the ground terminal GND signal and the power supply VDD signal; the nor gate controls the conduction of the first switch key1, the inverter controls the conduction of the first switch key2, and the output VDD is switched to the ground GND signal when the enable signal EN1 and the enable signal EN2 are turned off.

3. The input constant-current optically-controlled booster circuit of claim 1, further comprising a low-battery turn-off circuit, wherein the power supply switching circuit further comprises a fourth input terminal, the low-battery turn-off circuit receives the pin BAT signal to generate a control signal CTL, the fourth input terminal receives the control signal CTL, and the power supply switching circuit generates a turn-off signal when the pin BAT signal indicates that the battery is low; the signal of the pin LX, the enable signal EN1 and the control signal CTL generate an internal power supply pin VDD1 signal through the voltage boosting circuit and supply the internal power supply pin VDD1 signal to the power supply switching circuit so as to output the power supply VDD signal.

4. The input constant-current light-operated voltage boosting circuit according to claim 3, wherein the battery low-power turn-off circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a MOS transistor 3, a MOS transistor 4 and a Schmitt trigger, wherein the resistor R8, the resistor R9 and the resistor R10 are sequentially connected in series between the pin BAT and the ground terminal GND, and the resistor R11 is connected to the internal power supply pin vdd1 and an input end of the Schmitt trigger; the grid electrode of the MOS transistor 3 is connected with the connection point of the resistor R8 and the resistor R9, the drain electrode is connected with the input end of the Schmitt trigger, and the source electrode is connected with the grounding end GND; the grid of the MOS transistor 4 is connected with the output end of the Schmitt trigger, the drain of the MOS transistor 4 is connected with the connection point of the resistor R9 and the resistor R10, and the source of the MOS transistor 4 is connected with the ground end GND; the output of the schmitt trigger outputs the control signal CTL.

5. The input constant-current optically-controlled booster circuit according to claim 4, wherein the MOS transistor 3 and the MOS transistor 4 are NMOS transistors.

6. The input constant-current optically-controlled booster circuit of claim 1, wherein the booster circuit comprises a resistor R1, a resistor R2, a resistor R3, an operational amplifier and a MOS transistor MN0, wherein the resistor R1, the resistor R2 and the resistor R3 are sequentially connected in series between the pin BAT and the ground terminal GND, the anode of the operational amplifier is connected to the pin SOL, the cathode of the operational amplifier is connected to the connection point of the resistor R1 and the resistor R2, the drain of the MOS transistor MN0 is connected to the connection point of the resistor R2 and the resistor R3, and the source of the MOS transistor MN0 is connected to the ground terminal GND; the gate of the MOS transistor MN0 is connected with the output end of the operational amplifier; the output terminal of the operational amplifier outputs the enable signal EN 1.

7. The input constant-current light-operated boost circuit according to claim 1, wherein the solar charging control circuit comprises a resistor R4, a resistor R5, an operational amplifier and a MOS transistor MP0, the resistor R4 and the resistor R5 are sequentially connected in series between the pin SOL and the ground terminal GND, the anode of the operational amplifier is connected to the pin BAT, the cathode of the operational amplifier is connected to the connection point of the resistor R4 and the resistor R5, the drain of the MOS transistor MP0 is connected to the pin SOL, and the source of the MOS transistor MP0 is connected to the pin BAT; the gate of the MOS transistor MP0 is connected to the output terminal of the operational amplifier.