CN220023125U

CN220023125U - Control circuit of solar street lamp

Info

Publication number: CN220023125U
Application number: CN202320828666.0U
Authority: CN
Inventors: 汤敏珍; 王小燕; 朱江彬; 郑凌
Original assignee: Xiamen Langxing Technology Co ltd
Current assignee: Xiamen Langxing Technology Co ltd
Priority date: 2023-04-14
Filing date: 2023-04-14
Publication date: 2023-11-14
Anticipated expiration: 2033-04-14

Abstract

The utility model relates to the technical field of street lamps. The utility model discloses a control circuit of a solar street lamp, which comprises a mains supply input, a solar panel, a power supply circuit, a main control circuit, a charging selection circuit, a battery charging management circuit, a battery, a power supply selection circuit and an LED driving circuit, wherein the output ends of the mains supply input and the solar panel are connected with the input end of the battery charging management circuit through the charging selection circuit, the output end of the battery charging management circuit is connected with the battery, the output end of the battery and the mains supply input are connected with the input end of the LED driving circuit through the power supply selection circuit, and the charging selection circuit, the battery charging management circuit, the power supply selection circuit and the LED driving circuit are respectively connected with the main control circuit, and the mains supply input, the solar panel and the battery supply power to the main control circuit through the power supply circuit. The utility model can realize reliable lighting, and when the battery is damaged, the utility power can supply power without replacing the lamp, thereby saving the cost and having high reliability.

Description

Control circuit of solar street lamp

Technical Field

The utility model belongs to the technical field of street lamps, and particularly relates to a control circuit of a solar street lamp.

Background

Street lamps are lamps which provide illumination functions for roads and are widely applied to various places needing illumination. The solar street lamp can supply power to the street lamp by utilizing solar energy, so that the electric energy loss is greatly reduced, the environmental protection is facilitated, and the street lamp is widely used. However, the original solar street lamp only supplies power to the lithium battery by solar energy, and because the capacity of the lithium battery is limited, the lithium battery can possibly have insufficient capacity and can not be lighted in continuous overcast and rainy days, so that the life of a user is influenced, and the lamp needs to be replaced when the lithium battery is damaged, so that the cost is high. In addition, the control circuit of the original solar street lamp only supplies power to the lithium battery, and when the electric quantity of the lithium battery is insufficient or damaged, the control circuit cannot work normally, so that the reliability is low.

Disclosure of Invention

The utility model aims to provide a control circuit of a solar street lamp, which is used for solving the technical problems.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a control circuit of solar street lamp, including mains supply input, solar panel, power supply circuit, master control circuit, charge selection circuit, battery charge management circuit, the battery, power supply selection circuit and LED drive circuit, the output of mains supply input and solar panel passes through charge selection circuit and connects battery charge management circuit's input, battery charge management circuit's output termination battery, battery's output and mains supply input pass through power supply selection circuit and connect LED drive circuit's input, LED drive circuit's output termination light source, charge selection circuit, battery charge management circuit, power supply selection circuit and LED drive circuit are connected with master control circuit respectively, mains supply input, solar panel and battery pass through power supply circuit and supply for master control circuit.

Further, the power supply circuit comprises a diode D3, a diode D6 and a diode D7, and the output end of the solar panel, the input end of the mains supply and the output end of the battery are respectively connected with the power supply end of the main control circuit through the diode D3, the diode D6 and the diode D7.

Furthermore, the power supply circuit further comprises a linear voltage stabilizer U4, and the output end of the solar panel is connected with the power supply end of the main control circuit through a diode D3 after passing through the linear voltage stabilizer U4.

Further, the charging selection circuit comprises a first switch circuit and a second switch circuit, and the input end of the mains supply and the output end of the solar panel are respectively connected with the input end of the battery charging management circuit through the first switch circuit and the second switch circuit.

Furthermore, the first switch circuit comprises an NMOS tube Q5, a PMOS tube Q1 and a PMOS tube Q2, the PMOS tube Q1 and the PMOS tube Q2 are connected in reverse series and then connected between the mains supply input and the input end of the battery charging management circuit, the grid electrodes of the PMOS tube Q1 and the PMOS tube Q2 are connected with the source electrode of the NMOS tube Q5, the drain electrode of the NMOS tube Q5 is grounded, and the grid electrode of the NMOS tube Q5 is connected with the master control circuit.

Further, the second switch circuit comprises an NMOS tube Q6, a PMOS tube Q3 and a PMOS tube Q4, the PMOS tube Q3 and the PMOS tube Q4 are connected in reverse series and then connected between the output end of the solar panel and the input end of the battery charging management circuit, the grid electrodes of the PMOS tube Q3 and the PMOS tube Q4 are connected with the source electrode of the NMOS tube Q6, the drain electrode of the NMOS tube Q6 is grounded, and the grid electrode of the NMOS tube Q6 is connected with the main control circuit.

Further, the power supply selection circuit comprises a battery power supply switch circuit and a mains supply switch circuit, the output end of the battery and the mains supply input are respectively connected with the input end of the LED driving circuit through the battery power supply switch circuit and the mains supply switch circuit, and the control ends of the battery power supply switch circuit and the mains supply switch circuit are respectively connected with the main control circuit.

Furthermore, the battery power supply switching circuit is composed of a double-P-channel field effect transistor M1, an NMOS transistor Q14 and an NMOS transistor Q15, and the mains supply switching circuit is realized by a power switch U1.

Further, the LED driving circuit further comprises a load short-circuit protection circuit, and the load short-circuit protection circuit is arranged on the output end of the LED driving circuit.

Further, the battery charge management circuit is implemented by using a charge management chip US1 with a model number CN 3791.

The beneficial technical effects of the utility model are as follows:

the utility model can charge the battery by using the commercial power and supply power to the light source of the street lamp, ensures that the street lamp can be normally lighted in overcast and rainy days, does not need to replace the lamp after the battery is damaged, and saves the cost; meanwhile, the mains supply, the solar panel and the battery are used for supplying power to the main control circuit, and even if one path of power supply has problems, the main control circuit can work normally and has high reliability.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of a circuit configuration of an embodiment of the present utility model;

FIG. 2 is a schematic circuit diagram of a master control circuit and a power supply circuit according to an embodiment of the present utility model;

FIG. 3 is a schematic circuit diagram of a charge selection circuit and a power supply selection circuit according to an embodiment of the present utility model;

fig. 4 is a schematic circuit diagram of a battery charge management circuit, an LED driving circuit, and a load short protection circuit according to an embodiment of the present utility model.

Detailed Description

For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present utility model. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

The utility model will now be further described with reference to the drawings and detailed description.

As shown in fig. 1-4, a control circuit of a solar street lamp comprises a mains supply input 1, a solar panel 2, a power supply circuit 3, a main control circuit 4, a charging selection circuit 5, a battery charging management circuit 6, a battery 7, a power supply selection circuit 8, an LED driving circuit 9 and a load short-circuit protection circuit 10, wherein output ends of the mains supply input 1 and the solar panel 2 are connected with input ends of the battery charging management circuit 6 through the charging selection circuit 5, output ends of the battery charging management circuit 6 are connected with the battery 7, output ends of the battery 7 and the mains supply input 1 are connected with input ends of the LED driving circuit 9 through the power supply selection circuit 8, output ends of the LED driving circuit 9 are connected with a light source through the load short-circuit protection circuit 10, and the charging selection circuit 5, the battery charging management circuit 6, the power supply selection circuit 8 and the LED driving circuit 9 are respectively electrically connected with the main control circuit 4, and the mains supply input 1, the solar panel 2 and the battery 7 are supplied with power for the main control circuit 4 through the power supply circuit 3.

In this embodiment, the main control circuit 4 is implemented by a singlechip U2 with the model of FT61F133B-RB, and has a simple structure and is easy to implement, and the specific circuit is shown in FIG. 2. However, the present utility model is not limited thereto, and in some embodiments, the main control circuit 4 may be implemented by another single chip microcomputer.

The mains input 1 is an adapter input, and the input voltage is 5V, but not limited thereto. The solar panel 2 can be implemented by using various solar panels of existing solar street lamps, which will not be described in detail. The battery 7 is implemented with a lithium iron battery BAT1, although in some embodiments the battery 7 may be implemented with other batteries.

Specifically, in this embodiment, the power supply circuit 3 includes a diode D3, a diode D6 and a diode D7, and the output end pv+ of the solar panel 2, the adapter input 5V and the output end VBAT of the lithium iron battery BAT1 are connected to the power supply end v_mcu of the single chip microcomputer U2 through the diode D3, the diode D6 and the diode D7, respectively. The commercial power, the solar panel 2 and the lithium iron battery BAT1 are adopted to jointly supply power for the singlechip U2, and even if one path of problems occur, the singlechip U2 can work normally and has high reliability.

Further, the power supply circuit 3 further comprises a linear voltage stabilizer U4, and the output end PV+ of the solar panel 2 is connected with the power supply end V_MCU of the singlechip U2 through a diode D3 after passing through the linear voltage stabilizer U4, so that the stability of solar power supply is further improved.

In this embodiment, the charging selection circuit 5 includes a first switch circuit and a second switch circuit, and the adapter input 5V and the output terminal pv+ of the solar panel 2 are connected to the input terminal vcc_ch of the battery charging management circuit 6 through the first switch circuit and the second switch circuit, respectively.

More specifically, in this embodiment, the first switch circuit includes an NMOS transistor Q5, a PMOS transistor Q1 and a PMOS transistor Q2, where the PMOS transistor Q1 and the PMOS transistor Q2 are connected in reverse series and then connected between the adapter input 5V and the input end vcc_ch of the battery charging management circuit 6, the gates of the PMOS transistor Q1 and the PMOS transistor Q2 are connected to the source of the NMOS transistor Q5, the drain of the NMOS transistor Q5 is grounded, and the gate of the NMOS transistor Q5 is connected to the control end 5v_in of the single chip microcomputer U2, which is shown in fig. 3, and not described in detail. Through the arrangement of the PMOS tube Q1 and the PMOS tube Q2, the reverse connection protection of the power supply is realized, the current backflow of the lithium iron battery BAT1 to the input 5V of the adapter is prevented, and the safety and the reliability are improved.

The second switch circuit comprises an NMOS tube Q6, a PMOS tube Q3 and a PMOS tube Q4, the PMOS tube Q3 and the PMOS tube Q4 are connected IN reverse series and then connected between an output end PV+ of the solar panel 2 and an input end VCC_CH of the battery charging management circuit 6, grid electrodes of the PMOS tube Q3 and the PMOS tube Q4 are connected with a source electrode of the NMOS tube Q6, a drain electrode of the NMOS tube Q6 is grounded, and a grid electrode of the NMOS tube Q6 is connected with a control end PV_IN of the singlechip U2, and a more specific circuit is shown IN FIG. 3 and is not described IN detail. Through the arrangement of the PMOS tube Q3 and the PMOS tube Q4, the reverse connection protection of the power supply is realized, the current of the iron lithium battery BAT1 is prevented from flowing backwards to the output end PV+ of the solar panel 2, and the safety and the reliability are improved.

In this embodiment, the power supply selection circuit 8 includes a battery power supply switch circuit and a mains supply switch circuit, the output end VBAT of the lithium iron battery BAT1 and the adapter input 5V are connected to the input end vcc_com of the LED driving circuit 9 through the battery power supply switch circuit and the mains supply switch circuit, respectively, and the control ends of the battery power supply switch circuit and the mains supply switch circuit are connected to the control end 5v_led of the single chip microcomputer U2, respectively.

More specifically, in this embodiment, the battery-powered switching circuit is formed by using a dual P-channel field effect transistor M1, an NMOS transistor Q14, and an NMOS transistor Q15, and the mains-powered switching circuit is implemented by using a power switch U1 with a model LN9703, and the specific circuit is shown in fig. 3, and of course, in some embodiments, the power supply selection circuit 8 may also be implemented by using other existing selection switching circuits.

In this embodiment, the battery charging management circuit 6 is implemented by using a charging management chip US1 with a model number CN3791, and has a small package shape, few peripheral components, and simple use, and more specific circuits are shown in fig. 4, which will not be described in detail. Of course, in some embodiments, the battery charge management circuit 6 may also be implemented using other existing battery charge management circuits.

In this embodiment, the battery voltage detection circuit is further included, and the battery voltage detection circuit is configured to detect the voltage of the lithium iron battery BAT1, and the battery voltage detection circuit includes a resistor RS7, a resistor RS9, a resistor RS11, and a capacitor CS8, and the specific circuit connection is shown in fig. 4, but is not limited thereto.

The LED driving circuit 9 is implemented by using an LED driving chip U3 with the model CN5832, which has low cost and small volume, the light source is an LED light source 11, and the LED driving circuit is composed of a plurality of LED lamps (including LED2, LED3 and LED 4), and the specific circuit connection is shown in fig. 4, but not limited thereto.

The load short-circuit protection circuit 10 is arranged at the output ends LED+ and LED-of the LED drive circuit 9, if the LED light source 11 (load) is short-circuited, the damage to the device is avoided, the load can be normally used when the load is disconnected, and the safety and the reliability are further improved. The load short-circuit protection circuit 10 includes an NMOS transistor QA1, a diode D5, an NPN transistor Q12, a voltage regulator DZ3, a PNP transistor Q9, and the like, and the specific circuit is shown in fig. 4.

The working process comprises the following steps:

during daytime, the control end PV-EN of the singlechip U2 outputs a high level, the NMOS tube Q6, the PMOS tube Q3 and the PMOS tube Q4 are conducted, the output end PV+ of the solar panel 2 charges the lithium iron battery BAT1 through the battery charging management circuit 6, the control end 5V-EN of the singlechip U2 outputs a low level, the NMOS tube Q5, the PMOS tube Q1 and the PMOS tube Q2 are cut off, and the adapter input 5V does not charge the lithium iron battery BAT 1.

And (5) lighting at night: the singlechip U2 detects the voltage of the lithium iron battery BAT1 through the battery voltage detection circuit, when the voltage of the lithium iron battery BAT1 meets the requirement of supplying power to the LED driving circuit 9, the control end 5V-LED of the singlechip U2 outputs a low level, the double-P-channel field effect transistor M1 is conducted, the power switch U1 is cut off, the lithium iron battery BAT1 is preferentially controlled to be charged for supplying power to the LED driving circuit 9, and then the LED light source 11 is driven to be on; when the voltage of the lithium iron battery BAT1 cannot supply power to the LED driving circuit 9, the control end 5V-LED and the control end 5V-EN of the singlechip U2 output high level, the control end PV-EN of the singlechip U2 outputs low level, the NMOS tube Q6, the PMOS tube Q3 and the PMOS tube Q4 are cut off, the NMOS tube Q5, the PMOS tube Q1 and the PMOS tube Q2 are conducted, the input 5V of the adapter charges the lithium iron battery BAT1 through the battery charging management circuit 6, the double-P-channel field effect tube M1 is cut off, the power switch U1 is conducted, the input 5V of the adapter is controlled to supply power to the LED driving circuit 9, and the LED light source 11 is driven to be on, so that the normal lighting of the lamp in overcast and rainy weather is ensured, and after the battery is damaged, the power can be directly supplied by the mains supply, the lamp does not need to be replaced, and the cost is saved.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A control circuit of a solar street lamp is characterized in that: the solar panel is characterized by comprising a mains supply input, a solar panel, a power supply circuit, a main control circuit, a charging selection circuit, a battery charging management circuit, a battery, a power supply selection circuit and an LED driving circuit, wherein the output ends of the mains supply input and the solar panel are connected with the input end of the battery charging management circuit through the charging selection circuit, the output end of the battery charging management circuit is connected with the battery, the output end of the battery and the mains supply input are connected with the input end of the LED driving circuit through the power supply selection circuit, the output end of the LED driving circuit is connected with a light source, and the charging selection circuit, the battery charging management circuit, the power supply selection circuit and the LED driving circuit are respectively connected with the main control circuit and are powered by the power supply circuit.

2. The control circuit of a solar street lamp according to claim 1, wherein: the power supply circuit comprises a diode D3, a diode D6 and a diode D7, and the output end of the solar panel, the input end of the mains supply and the output end of the battery are respectively connected with the power supply end of the main control circuit through the diode D3, the diode D6 and the diode D7.

3. The control circuit of a solar street lamp according to claim 2, wherein: the power supply circuit further comprises a linear voltage stabilizer U4, and the output end of the solar panel is connected with the power supply end of the main control circuit through a diode D3 after passing through the linear voltage stabilizer U4.

4. The control circuit of a solar street lamp according to claim 1, wherein: the charging selection circuit comprises a first switch circuit and a second switch circuit, and the input end of the commercial power and the output end of the solar panel are respectively connected with the input end of the battery charging management circuit through the first switch circuit and the second switch circuit.

5. The control circuit of a solar street lamp according to claim 4, wherein: the first switch circuit comprises an NMOS tube Q5, a PMOS tube Q1 and a PMOS tube Q2, wherein the PMOS tube Q1 and the PMOS tube Q2 are connected between the mains supply input and the input end of the battery charging management circuit after being connected in reverse series, the grid electrodes of the PMOS tube Q1 and the PMOS tube Q2 are connected with the source electrode of the NMOS tube Q5, the drain electrode of the NMOS tube Q5 is grounded, and the grid electrode of the NMOS tube Q5 is connected with the main control circuit.

6. The control circuit of a solar street lamp according to claim 4, wherein: the second switch circuit comprises an NMOS tube Q6, a PMOS tube Q3 and a PMOS tube Q4, the PMOS tube Q3 and the PMOS tube Q4 are connected between the output end of the solar panel and the input end of the battery charging management circuit after being connected in reverse series, the grid electrodes of the PMOS tube Q3 and the PMOS tube Q4 are connected with the source electrode of the NMOS tube Q6, the drain electrode of the NMOS tube Q6 is grounded, and the grid electrode of the NMOS tube Q6 is connected with the main control circuit.

7. The control circuit of a solar street lamp according to claim 1, wherein: the power supply selection circuit comprises a battery power supply switch circuit and a mains supply switch circuit, the output end and the mains supply input of the battery are respectively connected with the input end of the LED driving circuit through the battery power supply switch circuit and the mains supply switch circuit, and the control ends of the battery power supply switch circuit and the mains supply switch circuit are respectively connected with the main control circuit.

8. The control circuit of a solar street lamp according to claim 1, wherein: the battery power supply switching circuit is composed of a double-P-channel field effect transistor M1, an NMOS transistor Q14 and an NMOS transistor Q15, and the mains supply switching circuit is realized by a power switch U1.

9. The control circuit of a solar street lamp according to claim 1, wherein: the LED driving circuit further comprises a load short-circuit protection circuit, and the load short-circuit protection circuit is arranged on the output end of the LED driving circuit.

10. The control circuit of a solar street lamp according to claim 1, wherein: the battery charge management circuit is implemented by a charge management chip US1 with the model number of CN 3791.