CN210431963U

CN210431963U - Low-voltage lithium battery human body induction LED solar street lamp controller

Info

Publication number: CN210431963U
Application number: CN201920990230.5U
Authority: CN
Inventors: 袁杰
Original assignee: Beijing Remote Power Renewable Energy Technology Co
Current assignee: Beijing Remote Power Renewable Energy Technology Co
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-04-28
Anticipated expiration: 2029-06-27

Abstract

The utility model provides a human response LED solar street lamp controller of low pressure lithium cell, including infrared communication module, low pressure LED control module, human response module, PWM module, power management module, the constant current module that steps up, charging circuit link, lithium cell link, switch, load link, infrared communication module with human response module with low pressure LED control module's IO pin is connected, low pressure LED control module to power management module takes place control command, PWM module that charges receives low pressure LED control module drive signal, the constant current module that steps up will power management module's electric energy conversion becomes the voltage that the load link needs. This solar street lamp controller adopts the control constant current charging design, and the power supply that steps up is carried out single cluster lithium cell, saves LED drive power supply, reduces LED solar street lamp's circuit complexity, reduces the waste that single lithium cell damage leads to electric core to be eliminated.

Description

Low-voltage lithium battery human body induction LED solar street lamp controller

Technical Field

The utility model relates to a street lamp control technical field especially relates to a human response LED solar street lamp controller of low pressure lithium cell.

Background

The LED solar street lamp can convert heat energy into electric energy through the solar panel so as to be used for illumination without other power supply equipment. In order to save electric energy resources, the LED solar street lamp is more and more widely used.

The solar street lamp controller is used for realizing charge and discharge control and coordinating the work of the solar cell panel, the storage battery and the load, is an important component in the whole LED solar street lamp, and ensures that the whole LED solar street lamp operates efficiently and safely.

The voltage of a power supply system unit of a traditional solar street lamp controller is 12V/24V, a battery pack formed by connecting a plurality of low-capacity low-voltage batteries in series supplies power to a street lamp, and after long-term operation, the elimination of the whole battery pack caused by the damage of a single lithium battery can occur, so that the environmental pollution and the resource waste are caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the shortcomings of the prior art, the utility model aims to provide a low-voltage lithium battery human body induction LED solar street lamp controller to reduce the environmental pollution and the waste of resources.

In order to realize the above-mentioned purpose, the utility model provides a human response LED solar street lamp controller of low pressure lithium cell, including infrared communication module, low pressure LED control module, human response module, PWM charge module, power management module, the constant current module that steps up, charging circuit link, lithium cell link, switch, load link, infrared communication module with human response module with low pressure LED control module's IO pin is connected, low pressure LED control module to power management module takes place control command, PWM charges the module and receives low pressure LED control module drive signal, the constant current module that steps up will power management module's electric energy conversion is in the voltage that the load link needs.

Preferably, the BOOST constant current module adopts a BOOST circuit.

Preferably, the lithium battery adopts a low-voltage single-string lithium battery cell, and the voltage of the battery connecting end supplies power to the load connecting end through the boosting constant-current module.

Preferably, the PWM charging module adopts a driving circuit of an MOS transistor, and the low-voltage LED control module controls the PWM charging module to perform PWM charging.

Preferably, the boosting constant current module provides a 3.3V power supply for the low-voltage LED control module.

Preferably, the power management module is configured with lithium battery over-discharge and overshoot protection functions.

Compared with the prior art, the beneficial effects of the utility model are embodied in:

(1) the utility model discloses a single cluster lithium cell power supply that steps up has avoided probably appearing damaging by single lithium cell after the long-term operation and has leaded to damaging the waste that the electric core was eliminated, has improved resource utilization.

(2) The utility model discloses a control constant current charging design, the low undercurrent is big, can save LED drive power supply, reduces LED solar street lamp's circuit complexity, and is small, easily installs.

Drawings

Fig. 1 is a schematic structural view of a low-voltage lithium battery human body induction LED solar street lamp controller of the present invention;

fig. 2 is a circuit diagram of the PWM charging module of the present invention;

fig. 3 is a circuit diagram of the boost constant current module and the power management module of the present invention.

Detailed Description

In order to further understand the structure, characteristics and other objects of the present invention, the following detailed description is given with reference to the accompanying preferred embodiments, which are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention.

Fig. 1 is an example of the overall structure of a low-voltage lithium battery human body induction LED solar street lamp controller used in the present invention. In fig. 1, the solar street lamp controller comprises an infrared communication module, a low-voltage LED control module, a human body induction module, a PWM charging module, a power management module, a boosting constant-current module, a charging circuit connection terminal, a lithium battery connection terminal, a power switch, and a load connection terminal. The infrared communication module can be used for receiving the state information of the low-voltage LED control module. The infrared communication module can be used for sending a control command to the low-voltage LED control module, and the control command comprises a switch of the solar street lamp and a protection constant value parameter of charging and discharging of a lithium battery. The human body induction module measures the distance between a person and the street lamp through a sensor and transmits distance information to the low-voltage LED control module. And the low-voltage street lamp control module controls the street lamp according to the distance information. The low-voltage LED control module also receives voltage and current information of the PWM charging module, the power management module and the boosting constant-current module, and the low-voltage LED control module performs charging and discharging control according to the voltage and current information.

The low-voltage LED control module adopts a single chip microcomputer STM32 packaged by LQFP48, 3.3V voltage is adopted for power supply in the arrangement, and the solar street lamp control module is provided with a 12-bit AD channel. And an AD sampling pin 21 of the singlechip STM32 is connected with the output of the human body induction module.

The low-voltage LED control module is provided with 12 built-in AD conversion channels, and each input signal is respectively used for receiving data signals of the infrared communication module, the PWM charging module, the power management module and the boosting constant-current module.

Fig. 2 is a circuit diagram of the PWM charging module, where the input of the PWM charging module is light panel positive X1 and light panel negative X2 are the positive and negative electrodes of the solar cell panel, respectively. After the voltage of the light panel positive X1 and the light panel negative X2 is input, the transient voltage suppression diode DTVS1 suppresses the abrupt change of the voltage signal. The MOS transistors Q1 and Q2 are respectively used for controlling the battery to carry out PWM charging. The control instruction of the singlechip STM32 controls the conduction of the MOS tubes through the grids of the MOS tubes Q1 and Q2, the PMU charging is carried out according to a given charging curve, the input signal of the PWM charging module is obtained by a sensor according to current and voltage information, and the information is directly sent to the low-voltage LED control module for over-discharge, over-charge and over-voltage protection. The storage battery anode connecting end 1 and the storage battery cathode connecting end 2 are respectively used for being connected with the power management module so as to store electric energy of the solar cell panel.

Fig. 3 is a circuit diagram of the boost constant current module and the power management module. The BOOST constant-current module adopts a BOOST BOOST circuit, the lithium battery adopts a low-voltage single-string lithium battery cell of 2.8V-4.2V, and the lithium battery connecting end comprises a positive battery X3 and a negative battery X4 which are respectively a positive connecting terminal and a negative connecting terminal corresponding to the single-string lithium battery cell. The load wiring terminals are load positive X5 and load negative X6, and respectively correspond to positive and negative wiring terminals of a load LED and the like. The battery positive electrode connecting end 1 and the battery negative electrode connecting end 2 are respectively connected with the battery positive X3 and the battery negative X4. When the lithium battery runs in a charging state, the PWM charging module supplies power to the lithium battery through the positive connecting end 1 of the storage battery and the negative connecting end 2 of the storage battery. When the charging module is operated in a discharging state, the MOS tubes Q1 and Q2 of the PWM charging module are not conducted, and the PWM charging module does not provide electric energy to the positive connection terminal 1 and the negative connection terminal 2 of the storage battery. The power supply mode that BOOST BOOST circuit and single cluster lithium cell combine no longer need the series connection BOOST voltage of a plurality of lithium cells, the stability is high, additional damage that causes because the voltage-sharing problem when a damage can not appear.

The battery positive X3 and the load positive X5 are connected through a Boost circuit, and the Boost circuit is composed of a winding inductor L1, a Boost MOS tube Q3, a Schottky diode D1 and an output voltage-stabilizing capacitor C1. The Boost circuit can make the output voltage higher than the input voltage, thereby achieving the purpose of boosting. And the single chip microcomputer STM32 of the low-voltage LED control module automatically adjusts the driving signal of the boosting MOS tube Q3 by recognizing the number of the load lamp strings. The conversion of the driving signal of the Q3 causes the connection and disconnection of a boosting MOS tube Q3 of the Boost circuit, so that the output voltage is stable, and the load lamp does not flicker. By adopting the mode, the design of controlling constant-current charging can be realized, the output voltage is low, the current is high, an LED driving power supply can be saved, the circuit complexity of the LED solar street lamp is simplified, the volume of the designed circuit is reduced, and the LED solar street lamp is convenient to install.

The battery load X4 and the load X6 are connected through a discharge MOS tube Q5. And a driving signal of the discharging MOS tube Q5 is obtained by an I/O port of the single chip microcomputer STM32 of the low-voltage LED control module. R10 is current detection resistance of discharge circuit, current detection signal I_{load_cs}Amplifying the signal I according to a set proportion by an operational amplifier_LOADThe driving signal Q5G of the grid electrode of the discharging MOS tube Q5 is changed by detecting the size of the signal transmitted to the low-voltage LED control module single chip microcomputer STM32 and the low-voltage LED control module single chip microcomputer STM 32. The driving signal Q5G changes the PWM wave duty ratio of the grid of the Q5 to control the output current, and finally the purpose of constant current output is achieved. In the discharging process, the current detection resistor of the discharging loop converts a current signal into an input signal of the low-voltage LED control module, so that the discharging process adopts closed-loop control, and constant-current output is effectively realized.

It should be noted that the above mentioned contents and embodiments are intended to demonstrate the practical application of the technical solution provided by the present invention, and should not be interpreted as limiting the scope of the present invention. Various modifications, equivalent substitutions and improvements will occur to those skilled in the art and are intended to be within the spirit and scope of the present invention. The protection scope of the present invention is subject to the appended claims.

Claims

1. The low-voltage lithium battery human body induction LED solar street lamp controller is characterized by comprising an infrared communication module, a low-voltage LED control module, a human body induction module, a PWM charging module, a power management module, a boosting constant current module, a charging circuit connecting end, a lithium battery connecting end, a power switch and a load connecting end, wherein the infrared communication module and the human body induction module are connected with an I/O pin of the low-voltage LED control module, the low-voltage LED control module sends a control instruction to the power management module, the PWM charging module receives a driving signal of the low-voltage LED control module, and the boosting constant current module converts electric energy of the power management module into voltage required by the load connecting end.

2. The low-voltage lithium battery human body induction LED solar street lamp controller as claimed in claim 1, wherein the BOOST constant-current module adopts a BOOST circuit.

3. The low-voltage lithium battery human body induction LED solar street lamp controller according to claim 1, characterized in that the lithium battery adopts a low-voltage single-string lithium battery cell, and the voltage of the battery connection end supplies power to the load connection end through the boosting constant-current module.

4. The low-voltage lithium battery human body induction LED solar street lamp controller as claimed in claim 1, wherein the PWM charging module adopts a drive circuit of an MOS tube, and the low-voltage LED control module controls the PWM charging module to perform PWM charging.

5. The low-voltage lithium battery human body induction LED solar street lamp controller according to claim 1, wherein the boosting constant-current module provides a 3.3V power supply to the low-voltage LED control module.

6. The low-voltage lithium battery human body induction LED solar street lamp controller as claimed in claim 1, wherein the power management module is configured with lithium battery over-discharge and overshoot protection functions.