CN219086844U

CN219086844U - Lithium battery powered boost constant power output solar lighting circuit

Info

Publication number: CN219086844U
Application number: CN202223508435.6U
Authority: CN
Inventors: 王开; 殷飚; 卢其伟; 汤飞
Original assignee: Wuxi Yongjing Photoelectric Technology Co ltd
Current assignee: Wuxi Yongjing Photoelectric Technology Co ltd
Priority date: 2021-12-31
Filing date: 2022-12-27
Publication date: 2023-05-26
Anticipated expiration: 2032-12-27

Abstract

The utility model discloses a lithium battery powered boost constant power output solar lighting circuit, which comprises an MCU, wherein the MCU is connected with a power supply circuit, a charging circuit, a discharging circuit and a sampling circuit; the input end of the power supply circuit is connected with the photovoltaic panel and the battery, and the output end of the power supply circuit is connected with the 1 pin of the MCU through a low-dropout linear voltage regulator U4; the input end of the charging circuit is connected with the photovoltaic panel and the battery, and the output end of the charging circuit is connected with the 6 pins of the MCU; the input end of the discharging circuit is connected with the output end of the power supply circuit, the battery and 1 pin, 7 pin and 8 pin of the MCU, and the output end is connected with the sampling circuit and 14 pin of the MCU; the output end of the sampling circuit is connected with 10 pins, 11 pins, 13 pins and 15 pins of the MCU. The utility model can be matched with the high-voltage lamp bead plate used by the prior switching power supply, can also avoid the problem of large current voltage drop of the low-voltage lamp bead plate, can improve the output voltage and can reduce the output current.

Description

Lithium battery powered boost constant power output solar lighting circuit

Technical Field

The utility model relates to illumination, in particular to a lithium battery powered boost constant power output solar illumination circuit.

Background

In solar lighting systems, old LED lamps and circuits need to be replaced, but old circuit boards are different from new circuit boards, which cannot match the high voltage bead boards used by the previous switching power supplies, and the problem of large current drop of the loaded low voltage bead boards easily occurs.

Disclosure of Invention

In order to solve the defects in the prior art, the utility model provides the lithium battery powered boosting constant-power output solar lighting circuit, which can be matched with a high-voltage lamp bead plate used by a prior switching power supply, can also avoid the problem of large current voltage drop of a low-voltage lamp bead plate, and can reduce output current by improving output voltage.

In order to achieve the technical purpose, the utility model adopts the following technical scheme: the lithium battery powered boosting constant-power output solar lighting circuit comprises an MCU, wherein the MCU is connected with a power supply circuit, a charging circuit, a discharging circuit and a sampling circuit;

the input end of the power supply circuit is connected with the photovoltaic panel and the battery, and the output end of the power supply circuit is connected with the 1 pin of the MCU through a low-dropout linear voltage regulator U4; the input end of the charging circuit is connected with the photovoltaic panel and the battery, and the output end of the charging circuit is connected with the 6 pins of the MCU; the input end of the discharging circuit is connected with the output end of the power supply circuit, the battery and 1 pin, 7 pin and 8 pin of the MCU, and the output end is connected with the sampling circuit and 14 pin of the MCU; the output end of the sampling circuit is connected with 10 pins, 11 pins, 13 pins and 15 pins of the MCU.

Further, the power supply circuit includes a photovoltaic panel and a battery, the photovoltaic panel is connected with a diode D3, the battery is connected with a diode D2, the diode D3 and the diode D2 are commonly connected with the source electrode of the field effect transistor M1, the source electrode of the field effect transistor M1 is commonly connected with a resistor R6 through a resistor R5 and a grid electrode, the resistor R6 is grounded through a switch wire 1, the drain electrode of the field effect transistor M1 is connected with a capacitor C1 and a capacitor C2 which are connected in parallel, the capacitor C1 and the capacitor C2 are grounded after being connected in parallel, the drain electrode of the field effect transistor M1 is also connected with an inductor L1 and 4 pins, 5 pins and 6 pins of the boost chip U1, the pin 1 and the inductor L1 are commonly connected with the diode D1, the 3 pins of the boost chip U1 are connected with a capacitor C3 and a resistor R8 in parallel, the cathode of the resistor R8 is grounded through a resistor R7, the first path is grounded through a capacitor C4, the second path is grounded through a capacitor C5, and the third path is connected with the voltage difference of the low voltage regulator U4.

Further, the charging circuit comprises a field effect transistor M3, a field effect transistor M4, a field effect transistor M6 and a field effect transistor M7; the drain electrode of the field effect tube M3 is connected with the photovoltaic panel, the source electrode of the field effect tube M3 is connected with the source electrode of the field effect tube M6, the grid electrode of the field effect tube M3 is divided into three paths, the first path is connected with the grid electrode of the field effect tube M6, the second path is connected with the grid electrode of the field effect tube M4, and the third path is connected with the grid electrode of the field effect tube M7; the drain electrode of the field effect tube M4 is connected with the photovoltaic panel, the source electrode of the field effect tube M4 is divided into three paths, the first path is connected with the source electrode of the field effect tube M6, the second path is connected with the source electrode of the field effect tube M7, and the third path is connected with the grid electrode of the field effect tube M4 through a resistor R4; the grid electrode of the field effect transistor M4 is connected with the collector electrode of the triode Q4; the drain electrode of the field effect tube M6 and the drain electrode of the field effect tube M7 are both connected with the battery; the emitter of the triode Q4 is grounded, the base is grounded through a resistor R3, and the base is connected to the 6 pin of the MCU through a resistor R2.

Further, a capacitor C6 and a capacitor C7 are connected in parallel between the 1 pin and the 3 pin of the low dropout linear voltage regulator U4, the capacitor C6 and the capacitor C7 are grounded after being connected in parallel, and the positive electrode of the capacitor C7 is connected with the 1 pin of the MCU; the 1 pin of the MCU is also connected with a resistor R13, the resistor R13 is connected with a thermistor RT1 and a capacitor C9 which are connected in parallel, the thermistor RT1 and the capacitor C9 are connected in parallel and then grounded, and the resistor R13 is also connected with the 9 pin of the MCU; the pin 5 of the MCU is grounded through a resistor R9; the 2 pin of the MCU is connected with a resistor R16 and a red indicator light RL1 which are connected in series, and the red indicator light RL1 is grounded; the 3 pin of the MCU is connected with a resistor R15 and a yellow indicator lamp YL1 which are connected in series, and the yellow indicator lamp YL1 is grounded; the 4 feet of the MCU are connected with a resistor R14 and a green indicator light GL1 which are connected in series, and the green indicator light GL1 is grounded.

Further, the discharging circuit comprises a load light source LED1, a triode Q2, a triode Q3, a field effect tube M8, a field effect tube M2 and a field effect tube M5; the emitter of the triode Q1 is connected with the output end of a diode D1 of the power supply circuit, one path of the base of the diode D1 is connected with the output end of the diode D1 of the power supply circuit through a resistor R25, and the other path of the base of the diode D1 is connected with the collector of the triode Q2; the base electrode of the triode Q2 is connected with the pin 1 of the MCU through a resistor R22, and the emitter electrode of the triode Q2 is connected with the pin 7 of the MCU through a resistor R23; the collector of the triode Q1 is divided into three paths, the first path is connected with a diode D4 and a resistor R10 which are connected in series, the resistor R10 is connected with the emitter of the triode Q3, the second path is connected with the base of the triode Q3, and the third path is grounded through a resistor R26; one path of the emitter of the triode Q3 is connected with the resistor R24 and then grounded, and the other path of the emitter of the triode Q3 is connected with the grid electrode of the field effect transistor M2; the grid electrode of the field effect transistor M2 is grounded through a voltage stabilizing diode DZ 1; the source electrode of the field effect transistor M2 is grounded, one path of the drain electrode is connected with the inductor L2, and the other path of the drain electrode is connected with the diode D5; one path of the inductor L2 is grounded through the electrolytic capacitor E1, the other path of the inductor L2 is connected with the source electrode of the field effect tube M8, the drain electrode of the field effect tube M8 is connected with the battery, and the grid electrode is grounded through the resistor R1; the diode D5 is connected with an electrolytic capacitor E2, a resistor R19 and a capacitor C11 which are connected in parallel, and the electrolytic capacitor E2, the resistor R19 and the capacitor C11 are connected in parallel and then grounded; the diode D5 is also connected with the positive electrode of the load light source LED1 and the resistor R21, the negative electrode of the resistor R21 is connected with the resistor R20 and the capacitor C12 which are connected in parallel, the resistor R20 and the capacitor C12 are connected in parallel and then grounded, and the resistor R21 is also connected with the 14 pin of the MCU; the negative electrode of the load light source LED1 is connected to the drain electrode of the field effect tube M5, the source electrode of the field effect tube M5 is grounded through a resistor R18, one path of the grid electrode is grounded through a resistor R11, and the other path of the grid electrode is connected to the 8 pin of the MCU through a resistor R12.

Further, the sampling circuit comprises a two-way operational amplifier U2-A, a pin 1 of the U2-A is connected to a pin 13 of the MCU through a resistor R36, the resistor R36 is grounded through a capacitor C19, a resistor R37 and a capacitor C20 are connected in parallel between the pin 1 and the pin 2 of the U2-A, a capacitor C10 is connected in series between the pin 2 and the pin 3 of the U2-A, the pin 2 is grounded through a resistor R38, a resistor R39 and a capacitor C21 which are connected in parallel are connected to each other, the resistor R39 and the capacitor C21 are grounded after being connected in parallel, and the pin 3 is connected to a drain electrode of a field effect transistor M5 of the discharging circuit through a resistor R40; the pin 8 of the U2-A is connected with the output end of the diode D1 of the power supply circuit, and the pin 4 is grounded.

Further, the sampling circuit further comprises a double-circuit operational amplifier U2-B, the 7 pin of the U2-B is connected to the 15 pin of the MCU through a resistor R35, the resistor R35 is grounded through a capacitor C17, a resistor R33 and a capacitor C16 are connected in parallel between the 7 pin and the 6 pin of the U2-B, a capacitor C18 is connected in series between the 6 pin and the 5 pin of the U2-B, the 6 pin is grounded through a resistor R34, the 5 pin is connected with a resistor R32 and a capacitor C15 which are connected in parallel, the resistor R32 and the capacitor C15 are grounded after being connected in parallel, and the 5 pin is grounded through a resistor R31; and the pin 8 of the U2-B is connected with the output end of the diode D1 of the power supply circuit, and the pin 4 is grounded.

Further, the sampling circuit further comprises a resistor R28, wherein the positive electrode of the resistor R28 is connected with the battery, the negative electrode of the resistor R28 is connected with a capacitor C13 and a resistor R27 which are connected in parallel, and the capacitor C13 and the resistor R27 are grounded after being connected in parallel; the negative electrode of the resistor R28 is connected to the 11 pin of the MCU; the sampling circuit further comprises a resistor R30, the positive electrode of the resistor R30 is connected to the photovoltaic panel, the negative electrode of the resistor R30 is connected with a capacitor C14 and a resistor R29 which are connected in parallel, and the capacitor C14 and the resistor R29 are connected in parallel and then grounded; the negative electrode of the resistor R30 is connected to the 10 pin of the MCU.

In summary, the present utility model achieves the following technical effects:

the utility model provides a single-string lithium battery power supply boosting constant-power output solar lighting scheme, which comprises a single-string multi-parallel lithium battery, a 5V/6V photovoltaic panel and a load light source plate, wherein the single-string multi-parallel lithium battery comprises a ternary lithium battery and a ferric phosphate lithium battery, and the load light source plate forms a whole set of energy-saving environment-friendly lighting system which does not depend on mains supply, and can continuously work in a plurality of overcast and rainy days;

the utility model mainly aims at a lamp bead plate which can support 6-36V wide voltage instead of 3V for a load light source and can be matched with a high-voltage lamp bead plate used by a prior switching power supply;

the utility model can also avoid the problem of large current voltage drop of the low-voltage lamp bead plate, and can reduce the output current by improving the output voltage.

Drawings

FIG. 1 is a schematic diagram of a power supply circuit according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a charging circuit;

FIG. 3 is a schematic circuit diagram of a MCU section;

FIG. 4 is a schematic diagram of a discharge circuit;

FIG. 5 is a partial schematic diagram of a sampling circuit;

FIG. 6 is a further partial schematic diagram of a sampling circuit;

FIG. 7 is a further partial schematic diagram of a sampling circuit;

FIG. 8 is a partial schematic diagram of an infrared circuit;

fig. 9 is yet another partial schematic of an infrared circuit.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explanation of the present utility model and is not to be construed as limiting the present utility model, and modifications to the present embodiment, which may not creatively contribute to the present utility model as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Examples:

the utility model discloses a lithium battery powered boosting constant-power output solar lighting circuit, which mainly comprises a single-string multi-parallel lithium battery pack B+, a photovoltaic panel S+, a wide-voltage LED lamp bead panel and a lamp housing sleeve fitting meeting other installation conditions such as heat dissipation. The device comprises an MCU, wherein the MCU is connected with a power supply circuit, a charging circuit, a discharging circuit and a sampling circuit; the input end of the power supply circuit is connected with the photovoltaic panel and the battery, and the output end of the power supply circuit is connected with the 1 pin of the MCU through a low-dropout linear voltage regulator U4; the input end of the charging circuit is connected with the photovoltaic panel and the battery, and the output end of the charging circuit is connected with 6 pins of the MCU; the input end of the discharging circuit is connected with the output end of the power supply circuit, the battery and the 1 pin, the 7 pin and the 8 pin of the MCU, and the output end is connected with the sampling circuit and the 14 pin of the MCU; the output end of the sampling circuit is connected with 10 pins, 11 pins, 13 pins and 15 pins of the MCU.

The utility model relates to a control circuit for controlling a lithium battery driven LED by combining software and hardware based on an MCU with the model of FT61F 133A. Through the DC-DC boost circuit, voltage and current sampling are combined, and the constant power effect is achieved through the principle that the product of the voltage and the current is unchanged. And then the whole circuit can be controlled by burning software conforming to the hardware circuit and the requirements of clients.

Specifically, as shown in fig. 1, the power supply circuit includes a photovoltaic panel and a battery, the photovoltaic panel is connected with a diode D3, the battery is connected with a diode D2, the diode D3 and the diode D2 are commonly connected to the source electrode of the field effect transistor M1, the source electrode of the field effect transistor M1 is commonly connected to a resistor R6 through a resistor R5 and a gate electrode, the resistor R6 is grounded through a switch line 1, the drain electrode of the field effect transistor M1 is connected with a capacitor C1 and a capacitor C2 in parallel, the capacitor C1 and the capacitor C2 are grounded after being connected in parallel, the drain electrode of the field effect transistor M1 is also connected with an inductor L1 and a 4 pin, a 5 pin and a 6 pin of the boost chip U1, a 1 pin and the inductor L1 are commonly connected to the diode D1, a capacitor C3 and a resistor R8 are connected between the diode D1 and the 3 pin of the boost chip U1 in parallel, the cathode of the resistor R8 is grounded through a resistor R7, the anode of the resistor R8 is divided into three paths, the first path is grounded through the capacitor C4, the second path is grounded through the capacitor C5, and the third path is connected to the voltage regulator U2.

D2 D3 is a schottky diode, and the photovoltaic panel and the battery can supply power to the boost chip HM1548B at the same time. M1 is a P channel MOS tube, and can control the power supply to the whole loop through a switch wire. L1, D1 are the peripheral device inductance and diode of boost IC HM1548B, and R8 and R7 can adjust the voltage of output, and the boost is the power supply of MOS pipe grid in for DC-DC circuit, the power supply of fortune amplifier and MCU's stable power supply.

As shown in fig. 2, the charging circuit includes a field effect transistor M3, a field effect transistor M4, a field effect transistor M6, and a field effect transistor M7; the drain electrode of the field effect tube M3 is connected with the photovoltaic panel, the source electrode of the field effect tube M3 is connected with the source electrode of the field effect tube M6, the grid electrode of the field effect tube M3 is divided into three paths, the first path is connected with the grid electrode of the field effect tube M6, the second path is connected with the grid electrode of the field effect tube M4, and the third path is connected with the grid electrode of the field effect tube M7; the drain electrode of the field effect tube M4 is connected with the photovoltaic panel, the source electrode of the field effect tube M4 is divided into three paths, the first path is connected with the source electrode of the field effect tube M6, the second path is connected with the source electrode of the field effect tube M7, and the third path is connected with the grid electrode of the field effect tube M4 through a resistor R4; the grid electrode of the field effect transistor M4 is connected with the collector electrode of the triode Q4; the drain electrode of the field effect tube M6 and the drain electrode of the field effect tube M7 are both connected with the battery; the emitter of the triode Q4 is grounded, the base is grounded through a resistor R3, and the base is connected to the 6 pin of the MCU through a resistor R2.

M3, M4, M6, M7 are P channel field effect transistors, play a role in controlling to open and close charging in the process of charging the battery by the photovoltaic panel, also adjust charging current and prevent reverse discharging and light Fu Banzheng negative electrode from connecting with reverse short circuit, and Q4 is an NPN triode, and can control grid electrodes of M3, M4, M6, M7. R3 is a pull-down resistor of Q4, so that Q4 can be always turned off when a signal is not determined, and R2 is a driving resistor of MCU to a base electrode of Q1. R17 is the sampling resistor of the photovoltaic panel charging the battery. The charging current can be calculated by sampling the voltage across the resistor.

As shown in fig. 3, a capacitor C6 and a capacitor C7 are connected in parallel between the 1 pin and the 3 pin of the low dropout linear regulator U4, the capacitor C6 and the capacitor C7 are grounded after being connected in parallel, and the positive electrode of the capacitor C7 is connected with the 1 pin of the MCU; the 1 pin of the MCU is also connected with a resistor R13, the resistor R13 is connected with a thermistor RT1 and a capacitor C9 which are connected in parallel, the thermistor RT1 and the capacitor C9 are connected in parallel and then grounded, and the resistor R13 is also connected with the 9 pin of the MCU; the pin 5 of the MCU is grounded through a resistor R9; the 2 pin of the MCU is connected with a resistor R16 and a red indicator light RL1 which are connected in series, and the red indicator light RL1 is grounded; the 3 pin of the MCU is connected with a resistor R15 and a yellow indicator lamp YL1 which are connected in series, and the yellow indicator lamp YL1 is grounded; the 4 feet of the MCU are connected with a resistor R14 and a green indicator light GL1 which are connected in series, and the green indicator light GL1 is grounded.

U4 is a low dropout linear voltage regulator and provides a stable supply voltage for the MCU. U3 is MCU, model FT61F133A, RL1 is red pilot lamp, YL1 is yellow pilot lamp, GL1 is green pilot lamp, R14, R15, R16 red yellow green pilot lamp's current limiting resistor. R9 can switch the working voltage of the system, and the system is mounted or not mounted into two battery type power supply systems. RT1 is plug-in thermistor, through the resistance proportion with R13, can obtain external ambient temperature according to MCU's 9 foot voltage, realize prohibiting to battery charge and discharge under the certain temperature, play the effect of protection battery.

As shown in fig. 4, a schematic diagram of a discharge circuit is shown, and the discharge circuit includes a load light source LED1, a triode Q2, a triode Q3, a field effect transistor M8, a field effect transistor M2, and a field effect transistor M5; the emitter of the triode Q1 is connected with the output end of a diode D1 of the power supply circuit, one path of the base of the diode D1 is connected with the output end of the diode D1 of the power supply circuit through a resistor R25, and the other path of the base of the diode D1 is connected with the collector of the triode Q2; the base electrode of the triode Q2 is connected with the pin 1 of the MCU through a resistor R22, and the emitter electrode of the triode Q2 is connected with the pin 7 of the MCU through a resistor R23; the collector of the triode Q1 is divided into three paths, the first path is connected with a diode D4 and a resistor R10 which are connected in series, the resistor R10 is connected with the emitter of the triode Q3, the second path is connected with the base of the triode Q3, and the third path is grounded through a resistor R26; one path of the emitter of the triode Q3 is connected with the resistor R24 and then grounded, and the other path of the emitter of the triode Q3 is connected with the grid electrode of the field effect transistor M2; the grid electrode of the field effect transistor M2 is grounded through a voltage stabilizing diode DZ 1; the source electrode of the field effect transistor M2 is grounded, one path of the drain electrode is connected with the inductor L2, and the other path of the drain electrode is connected with the diode D5; one path of the inductor L2 is grounded through the electrolytic capacitor E1, the other path of the inductor L2 is connected with the source electrode of the field effect tube M8, the drain electrode of the field effect tube M8 is connected with the battery, and the grid electrode is grounded through the resistor R1; the diode D5 is connected with an electrolytic capacitor E2, a resistor R19 and a capacitor C11 which are connected in parallel, and the electrolytic capacitor E2, the resistor R19 and the capacitor C11 are connected in parallel and then grounded; the diode D5 is also connected with the positive electrode of the load light source LED1 and the resistor R21, the negative electrode of the resistor R21 is connected with the resistor R20 and the capacitor C12 which are connected in parallel, the resistor R20 and the capacitor C12 are connected in parallel and then grounded, and the resistor R21 is also connected with the 14 pin of the MCU; the negative electrode of the load light source LED1 is connected to the drain electrode of the field effect tube M5, the source electrode of the field effect tube M5 is grounded through a resistor R18, one path of the grid electrode is grounded through a resistor R11, and the other path of the grid electrode is connected to the 8 pin of the MCU through a resistor R12.

Q1 is PNP triode, R25 is the pull-up resistor of Q1, guarantees the stable closure of Q1, and Q2 is NPN triode, and the signal that exports through MCU's 7 foot can control Q2's switch, controls Q1's switch promptly. R22 and R23 are current limiting resistors of the Q2 base. D4 is a schottky diode, which can prevent reverse flow of the M2 gate voltage. R10 is the driving resistance of the M2 grid, and a smaller value can accelerate the conduction rate of M2, so that the switching power loss generated by M2 during high-frequency conduction is avoided. Q3 is PNP triode, can control the instantaneous closing of M2 grid, avoid because M2 produces the switching power loss when high frequency closes. M8 is the P channel MOS pipe, can prevent the battery from appearing the condition of short circuit and burn out the device when connecing the reverse, and when the battery is contrary, if not M8, through M2's parasitic diode, the battery can short circuit. M2 is a high-power N-channel MOS tube, and controls the energy storage of the L2 inductor. D5 is a large current schottky diode, and plays roles of follow current and reverse conduction prevention. DZ1 is a zener diode, which can protect the gate of M2 from damaging M2 due to excessive voltage. E1 and E2 are electrolytic capacitors, can play roles in filtering and energy storage, and the boost circuit utilizes the characteristics that the current of an inductor cannot be suddenly changed and the voltage of the capacitor cannot be suddenly changed to continuously charge and discharge E2 so as to achieve the boost effect. M5 is N channel MOS pipe, can control the switch of LED load light source, when load light source is unusual or short-circuit, can close the light source switch, prevents to damage the battery. R1 is a gate pull-down resistor of M8, which ensures stable conduction of M8 at positive input and stable closing of M8 at negative input. L2 is a high-power inductor, and plays a role in boosting and storing energy. R24 is a pull-down resistor of the M2 grid electrode, and stable closing of M2 is ensured. R19 is a boost discharging resistor, and can discharge the redundant electric quantity of the capacitor when the LED load is closed. C11 is a boost filter capacitor, which suppresses high frequency interference. R12 is an M5 gate driving resistor, and R11 is an M2 gate pull-down resistor. R18 is the current sampling resistor when the LED load discharges. R21 and R20 can sample the boosted voltage, and C12 is a sampling filter capacitor.

As shown in fig. 5, a partial schematic diagram of a sampling circuit is shown, the sampling circuit comprises a two-way operational amplifier U2-a, a 1 pin of the U2-a is connected to a 13 pin of the MCU through a resistor R36, the resistor R36 is further grounded through a capacitor C19, a resistor R37 and a capacitor C20 are further connected in parallel between the 1 pin and the 2 pin of the U2-a, a capacitor C10 is further connected in series between the 2 pin and the 3 pin of the U2-a, the 2 pin is further grounded through a resistor R38, the 3 pin is further connected with a resistor R39 and a capacitor C21 which are connected in parallel, the resistor R39 and the capacitor C21 are grounded after being connected in parallel, and the 3 pin is further connected to a drain electrode of a field effect transistor M5 of the discharging circuit through a resistor R40; the pin 8 of the U2-A is connected with the output end of the diode D1 of the power supply circuit, and the pin 4 is grounded.

As shown in fig. 6, the sampling circuit is a partial schematic diagram, the sampling circuit further comprises a two-way operational amplifier U2-B, the 7 pin of the U2-B is connected to the 15 pin of the MCU through a resistor R35, the resistor R35 is further grounded through a capacitor C17, a resistor R33 and a capacitor C16 are further connected in parallel between the 7 pin and the 6 pin of the U2-B, a capacitor C18 is further connected in series between the 6 pin and the 5 pin of the U2-B, the 6 pin is further grounded through a resistor R34, the 5 pin is further connected with a resistor R32 and a capacitor C15 which are connected in parallel, the resistor R32 and the capacitor C15 are grounded after being connected in parallel, and the 5 pin is further grounded through a resistor R31; the pin 8 of the U2-B is connected with the output end of the diode D1 of the power supply circuit, and the pin 4 is grounded.

As shown in fig. 7, the sampling circuit is a partial schematic diagram, the sampling circuit further comprises a resistor R28, the positive electrode of the resistor R28 is connected to the battery, the negative electrode of the resistor R28 is connected with a capacitor C13 and a resistor R27 which are connected in parallel, and the capacitor C13 and the resistor R27 are grounded after being connected in parallel; the negative electrode of the resistor R28 is connected to the 11 pin of the MCU; the sampling circuit further comprises a resistor R30, the positive electrode of the resistor R30 is connected to the photovoltaic panel, the negative electrode of the resistor R30 is connected with a capacitor C14 and a resistor R29 which are connected in parallel, and the capacitor C14 and the resistor R29 are connected in parallel and then grounded; the negative electrode of the resistor R30 is connected to the 10 pin of the MCU.

In the sampling circuit, U2 is an LM358 two-way operational amplifier, and can amplify the collected low voltage according to a proportion, so that the MCU voltage collection is facilitated. U2-A is the LED load discharge current operational amplifier part. R40 and R39 are LED load discharge current input voltage sampling voltage dividing resistors, and C21 has a filtering effect. At this time, R37 and R38 form 10 times of operational amplifier ratio, and C20 can eliminate high-frequency interference. R36 is 13 feet input voltage current limiting feet of MCU, and AD sampling feet of MCU are protected. C19 is the filter capacitance. U2-B is the charging current operational amplifier part, and because LM358 can input negative voltage, the operational amplifier gathers for negative voltage and amplifies and forward, and the same thing is obtained, also is 10 times operational amplifier this moment, and MCU's 15 feet are charging current sampling voltage pin. R27, R28 are voltage-collecting voltage-dividing resistors of the battery, and C13 is a voltage-collecting filter capacitor. R29, R30 are voltage-collecting voltage-dividing resistors of the photovoltaic panel, and C14 is a voltage-collecting filter capacitor.

As shown in fig. 8 and 9, the circuit is an infrared circuit schematic diagram, and further includes an infrared circuit, including an infrared connector IR1, wherein pin 1 of the infrared connector IR1 is connected to pin 1 of the MCU, pin 2 is grounded, pin 3 is grounded through a capacitor C8, and pin 3 is also connected to pin 12 of the MCU. Still include infrared emission tube D6, infrared emission tube D6's positive pole is connected in MCU's 1 foot through resistance R41, and the negative pole is connected in triode Q5's collecting electrode, triode Q5's base connecting resistance R42, and triode Q5's projecting pole is connected in triode Q6's projecting pole, triode Q6's base connecting resistance R43, triode Q6's collecting electrode ground connection.

The IR1 is an infrared receiving tube, can receive infrared signals emitted by the remote controller, and the MCU decodes the infrared signals to obtain emitted instructions and executes the emitted instructions. And C8 is an IR1 receiving pin filter capacitor, so as to inhibit high-frequency interference.

After a whole set of system is assembled, when entering the night from daytime slowly, the light received by the surface of the photovoltaic panel is reduced, namely the voltage of the photovoltaic panel is gradually reduced, when the voltage of the photovoltaic panel is detected to be gradually lower than a certain value by 10 feet of the MCU, the MCU judges that the load light source is required to be turned on to provide a lighting effect. The 8 pin of the MCU outputs a high level, and M5 starts to be conducted. The 7 pin of MCU gradually reduces PWM from high level, Q2 starts to turn on. Namely, Q1 is conducted according to a certain PWM, M2 is conducted according to the PWM, L2 inductance starts to short-circuit energy storage, L2 starts to discharge at the moment of M2 closing, when the frequency and the proportion are continuously according to a certain, the voltage on an E2 electrolytic capacitor is higher and higher until the load LED conducting voltage is reached, current flows through R18, 13 feet of MCU can collect the current value, 14 feet of MCU can collect the voltage value after boosting, when the PWM value is continuously reduced, the product of the two reaches a preset power value, and the change of PWM is stopped. The LED load light source reaches a preset power. If the load LED light source exceeds a preset voltage interval or is not connected, the voltage acquired by the 14 feet of the MCU exceeds an upper limit voltage, and when no current flows through the R18, PWM change is stopped, the M5 is closed, the boosting is closed, the 3 feet of the MCU start to output high and low levels, and a yellow indicator lamp starts to flash to prompt the overload or no load. If the load LED light source is lower than a preset voltage interval or short-circuited, namely, when the current on the R18 reaches an upper limit current, and when the voltage acquired by the 14 pin of the MCU is lower than a lower limit voltage, the M5 is closed, the boosting is closed, the yellow indicator lamp starts to be normally on, and the load is indicated to be too low or short-circuited. The working power of the load LED depends on the battery power and a preset working mode, and is automatically adjusted according to the battery power and the working mode. If when the battery enters the over-discharge state, the 7 feet of the MCU output high level, the Q2 is closed, the Q1 is closed, the M2 is closed, the boosting is closed, the 8 feet of the MCU output low level, the load LED light source is extinguished, the 2 feet of the MCU output high-low level, the red light enters the flickering state, and the battery is prompted to be deficient. If the battery voltage is not lower than the over-discharge value, the LED load light source can work all the time, when the night slowly enters the daytime, the light on the surface of the photovoltaic panel starts to increase, the voltage of the photovoltaic panel increases, when the 10 feet of the MCU detect that the voltage of the photovoltaic panel is gradually higher than a certain value, the MCU can judge that the daytime state is about to be entered at the moment, the 7 feet of the MCU output high level, the Q2 is closed, the Q1 is closed, the M2 is closed, the boosting is closed, the 8 feet of the MCU output low level, and the load LED light source is extinguished.

When the voltage of the photovoltaic panel is detected to be higher than a certain value, the photovoltaic panel can charge the battery. MCU can open the passageway that photovoltaic board charges to the battery, and M2, M3, M6, M7 can be opened gradually by the off state, and MCU's 4 feet become 0-100% PWM's cyclic conversion output, and green pilot lamp gets into the breathing state, suggestion photovoltaic board is charging to the battery this moment. The PWM output is gradually increased by the pin 7 of the MCU, the grid electrodes of M2, M3, M6 and M7 are controlled by Q1, namely, the grid electrodes of M2, M3, M6 and M7 are gradually conducted, current starts to flow through the R17, charging current can be acquired by the pin 15 of the MCU, and if the charging current does not exceed the set upper limit current, the grid electrodes of M2, M3, M6 and M7 are completely opened. If the MCU's pin 15 detects that the current flowing through R17 exceeds the upper limit current, the continuous over-high current conduction can cause serious heating of M2, M3, M6 and M7, and the MCU's pin 6 starts to reduce the output PWM in order to prevent overheat damage, the conduction time of M2, M3, M6 and M7 starts to reduce until the current on R17 maintains the upper limit charging current. When the voltage of the battery is detected to reach a certain value, the battery is about to enter an overcharged state, the system enters a constant-voltage uniform charging stage, the voltage at two ends of the battery is kept unchanged, charging PWM starts to decline, low-current charging is maintained until the value of R17 is detected to be lower than a certain value, M2, M3, M6 and M7 are closed, and charging is stopped. The 4 feet of the MCU output high level, the green light enters a normally-on state, and the full electric quantity is prompted. And (4) recovering the charging until the battery voltage is lower than a certain value, and cycling the steps.

When the MCU detects that the voltage of the photovoltaic panel is gradually reduced, the voltage is lower than a certain value, and the battery enters a discharging state, so that charge and discharge are damaged.

The utility model has the following functions:

the photovoltaic panel automatically opens and closes the charging of the battery; the photovoltaic panel limits the charging current of the battery, and protects the battery and a charging device; charging and discharging management of the lithium battery, namely overcharge and overdischarge protection of the battery; constant power driving LED lamp bead plate of lithium battery; the load LED lamp bead plate supports 6-36V wide voltage; load output current overcurrent protection; automatically turning on or off the light source according to the intensity of ambient light; the output brightness of the light source is adaptively adjusted according to the running time and the battery electric quantity;

the application scene is as follows: street lamp illumination, park illumination and illumination of other alternating current-free power supply areas.

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical principles of the present utility model are within the scope of the technical solutions of the present utility model.

Claims

1. A lithium battery powered boost constant power output solar lighting circuit is characterized in that: the device comprises an MCU, wherein the MCU is connected with a power supply circuit, a charging circuit, a discharging circuit and a sampling circuit;

2. The lithium battery powered boost constant power output solar lighting circuit of claim 1, wherein: the power supply circuit comprises a photovoltaic panel and a battery, wherein the photovoltaic panel is connected with a diode D3, the battery is connected with a diode D2, the diode D3 and the diode D2 are commonly connected with a source electrode of a field effect tube M1, the source electrode of the field effect tube M1 is commonly connected with a resistor R6 through a resistor R5 and a grid electrode, the resistor R6 is grounded through a switch wire 1, a drain electrode of the field effect tube M1 is connected with a capacitor C1 and a capacitor C2 which are connected in parallel, the capacitor C1 and the capacitor C2 are grounded after being connected in parallel, a drain electrode of the field effect tube M1 is also connected with an inductor L1 and 4 pins, 5 pins and 6 pins of a boost chip U1, the pin 1 and the inductor L1 are commonly connected with the diode D1, the diode D1 is connected with the 3 pins of the boost chip U1 in parallel with a capacitor C3 and a resistor R8, a cathode of the resistor R8 is grounded through a resistor R7, a positive electrode of the resistor R8 is divided into three paths, the first path is grounded through the capacitor C4, the second path is grounded through the capacitor C5, and the third path is connected with a voltage-stabilizing pin of the low-voltage regulator U4.

3. The lithium battery powered boost constant power output solar lighting circuit of claim 2, wherein: the charging circuit comprises a field effect transistor M3, a field effect transistor M4, a field effect transistor M6 and a field effect transistor M7; the drain electrode of the field effect tube M3 is connected with the photovoltaic panel, the source electrode of the field effect tube M3 is connected with the source electrode of the field effect tube M6, the grid electrode of the field effect tube M3 is divided into three paths, the first path is connected with the grid electrode of the field effect tube M6, the second path is connected with the grid electrode of the field effect tube M4, and the third path is connected with the grid electrode of the field effect tube M7; the drain electrode of the field effect tube M4 is connected with the photovoltaic panel, the source electrode of the field effect tube M4 is divided into three paths, the first path is connected with the source electrode of the field effect tube M6, the second path is connected with the source electrode of the field effect tube M7, and the third path is connected with the grid electrode of the field effect tube M4 through a resistor R4; the grid electrode of the field effect transistor M4 is connected with the collector electrode of the triode Q4; the drain electrode of the field effect tube M6 and the drain electrode of the field effect tube M7 are both connected with the battery; the emitter of the triode Q4 is grounded, the base is grounded through a resistor R3, and the base is connected to the 6 pin of the MCU through a resistor R2.

4. A lithium battery powered boost constant power output solar lighting circuit as defined in claim 3, wherein: a capacitor C6 and a capacitor C7 are connected in parallel between the 1 pin and the 3 pin of the low-dropout linear voltage regulator U4, the capacitor C6 and the capacitor C7 are grounded after being connected in parallel, and the positive electrode of the capacitor C7 is connected with the 1 pin of the MCU; the 1 pin of the MCU is also connected with a resistor R13, the resistor R13 is connected with a thermistor RT1 and a capacitor C9 which are connected in parallel, the thermistor RT1 and the capacitor C9 are connected in parallel and then grounded, and the resistor R13 is also connected with the 9 pin of the MCU; the pin 5 of the MCU is grounded through a resistor R9; the 2 pin of the MCU is connected with a resistor R16 and a red indicator light RL1 which are connected in series, and the red indicator light RL1 is grounded; the 3 pin of the MCU is connected with a resistor R15 and a yellow indicator lamp YL1 which are connected in series, and the yellow indicator lamp YL1 is grounded; the 4 feet of the MCU are connected with a resistor R14 and a green indicator light GL1 which are connected in series, and the green indicator light GL1 is grounded.

5. The lithium battery powered boost constant power output solar lighting circuit of claim 4, wherein: the discharging circuit comprises a load light source LED1, a triode Q2, a triode Q3, a field effect tube M8, a field effect tube M2 and a field effect tube M5; the emitter of the triode Q1 is connected with the output end of a diode D1 of the power supply circuit, one path of the base of the diode D1 is connected with the output end of the diode D1 of the power supply circuit through a resistor R25, and the other path of the base of the diode D1 is connected with the collector of the triode Q2; the base electrode of the triode Q2 is connected with the pin 1 of the MCU through a resistor R22, and the emitter electrode of the triode Q2 is connected with the pin 7 of the MCU through a resistor R23; the collector of the triode Q1 is divided into three paths, the first path is connected with a diode D4 and a resistor R10 which are connected in series, the resistor R10 is connected with the emitter of the triode Q3, the second path is connected with the base of the triode Q3, and the third path is grounded through a resistor R26; one path of the emitter of the triode Q3 is connected with the resistor R24 and then grounded, and the other path of the emitter of the triode Q3 is connected with the grid electrode of the field effect transistor M2; the grid electrode of the field effect transistor M2 is grounded through a voltage stabilizing diode DZ 1; the source electrode of the field effect transistor M2 is grounded, one path of the drain electrode is connected with the inductor L2, and the other path of the drain electrode is connected with the diode D5; one path of the inductor L2 is grounded through the electrolytic capacitor E1, the other path of the inductor L2 is connected with the source electrode of the field effect tube M8, the drain electrode of the field effect tube M8 is connected with the battery, and the grid electrode is grounded through the resistor R1; the diode D5 is connected with an electrolytic capacitor E2, a resistor R19 and a capacitor C11 which are connected in parallel, and the electrolytic capacitor E2, the resistor R19 and the capacitor C11 are connected in parallel and then grounded; the diode D5 is also connected with the positive electrode of the load light source LED1 and the resistor R21, the negative electrode of the resistor R21 is connected with the resistor R20 and the capacitor C12 which are connected in parallel, the resistor R20 and the capacitor C12 are connected in parallel and then grounded, and the resistor R21 is also connected with the 14 pin of the MCU; the negative electrode of the load light source LED1 is connected to the drain electrode of the field effect tube M5, the source electrode of the field effect tube M5 is grounded through a resistor R18, one path of the grid electrode is grounded through a resistor R11, and the other path of the grid electrode is connected to the 8 pin of the MCU through a resistor R12.

6. The lithium battery powered boost constant power output solar lighting circuit of claim 5, wherein: the sampling circuit comprises a double-circuit operational amplifier U2-A, wherein a pin 1 of the U2-A is connected to a pin 13 of the MCU through a resistor R36, the resistor R36 is also grounded through a capacitor C19, a resistor R37 and a capacitor C20 are connected in parallel between a pin 1 and a pin 2 of the U2-A, a capacitor C10 is also connected in series between a pin 2 and a pin 3 of the U2-A, the pin 2 is also grounded through a resistor R38, a resistor R39 and a capacitor C21 which are connected in parallel are also connected to the pin 3, the resistor R39 and the capacitor C21 are connected in parallel and then grounded, and the pin 3 is also connected to the drain electrode of a field effect transistor M5 of the discharge circuit through a resistor R40; the pin 8 of the U2-A is connected with the output end of the diode D1 of the power supply circuit, and the pin 4 is grounded.

7. The lithium battery powered boost constant power output solar lighting circuit of claim 6, wherein: the sampling circuit further comprises a double-circuit operational amplifier U2-B, the 7 pin of the U2-B is connected to the 15 pin of the MCU through a resistor R35, the resistor R35 is grounded through a capacitor C17, a resistor R33 and a capacitor C16 are connected in parallel between the 7 pin and the 6 pin of the U2-B, a capacitor C18 is connected in series between the 6 pin and the 5 pin of the U2-B, the 6 pin is grounded through a resistor R34, the 5 pin is connected with a resistor R32 and a capacitor C15 which are connected in parallel, the resistor R32 and the capacitor C15 are grounded after being connected in parallel, and the 5 pin is grounded through a resistor R31; and the pin 8 of the U2-B is connected with the output end of the diode D1 of the power supply circuit, and the pin 4 is grounded.

8. The lithium battery powered boost constant power output solar lighting circuit of claim 7, wherein: the sampling circuit further comprises a resistor R28, wherein the positive electrode of the resistor R28 is connected with the battery, the negative electrode of the resistor R28 is connected with a capacitor C13 and a resistor R27 which are connected in parallel, and the capacitor C13 and the resistor R27 are grounded after being connected in parallel; the negative electrode of the resistor R28 is connected to the 11 pin of the MCU; the sampling circuit further comprises a resistor R30, the positive electrode of the resistor R30 is connected to the photovoltaic panel, the negative electrode of the resistor R30 is connected with a capacitor C14 and a resistor R29 which are connected in parallel, and the capacitor C14 and the resistor R29 are connected in parallel and then grounded; the negative electrode of the resistor R30 is connected to the 10 pin of the MCU.