Solar Lighting Controller, Solar Street Lamp Controller
Solar Lighting Controller, Solar Street Lamp Controller
What is a solar street lamp controller?
Solar controller for solar photovoltaic systems, coordination of solar panels, batteries, work load is very important photovoltaic system components. So that the whole solar system, efficient and safe operation.
Solar street lamp controller is mainly used for domestic, commercial, factories, transport, pastoral, communication to other solar power systems. As solar street lamp controller should have the following basic features:
1) Overload protection
2) short circuit protection
3) reverse-discharge protection
4) Reverse polarity protection
5) Lightning Protection
6) voltage protection
7) overcharge protection
8/) Set the load power restoration
The choice of solar street lamp controller
A: You should choose a low-power controller, the controller work 24 hours a day, as they own large power consumption, it will consume some energy, the best choice for power control in less than 1 mA.
Second: To select high efficiency charge controller with MCT charge mode controller can automatically track the maximum current of solar panels, especially in the winter or periods of insufficient light, MCT charge mode about 20% higher than the efficiency.
C: should be selected with a two-way adjustable power controller, the controller has a power adjustment has been widely promoted, few pedestrians at night time can be automatically shut down one or two light, saving electricity, you can adjust for power LED lamps . In addition to the above selected power-saving features, it should also focus on batteries and other components of the controller protection features, such as a trickle charge mode of the controller can well protect the battery, increasing battery life, the other to set the controller undervoltage protect the value, try to protect the value of the transferred voltage in ≥ 11.1V, to prevent battery over discharge.
Solar street lamp controller design principles
Solar lights are the sun’s light as the main source of energy during the day will be free to charge at night use. Without laying any complex and expensive circuits and pipelines, but also the layout can be adjusted lighting, security, energy efficient and free of other pollutants, the process of charging and the use of switches with automatic light control, without manual operation, stable and reliable, saving electricity costs and power resources, maintenance-free, solar street light utility has been fully recognized by the people, this paper is based on single chip controller for solar street lamp design, 12V and 24V batteries can be automatically identified, the battery can be realized scientific management, can be indicative of the battery, overvoltage, undervoltage, etc. running, and has two load outputs, each load rated current up to 5A, two load can be arbitrarily set to the same light, timing light, separate timing and other variety of operating modes, while the load current, short circuit protect function; and a higher degree of automation and intelligence.
Hardware components and working principle is a hardware block diagram of solar street lighting system intelligent controller to STC12C5410AD microcontroller core. Mainly by the external circuit where the voltage acquisition circuit, is responsible for export control and detection circuit, LED display and keyboard circuit and so circuit composed of several parts, and voltage acquisition circuitry includes: solar panels and battery voltage acquisition, recognition for the strength of the sun’s rays and access to the battery voltage. Two of the microcontroller port P3 as the keyboard input port for setting parameters such as operating mode.
In the system STC12C5410AD, voltage acquisition and battery management, load control and detection circuit output of the design and implementation. STC12C5410AD SCM SCM STC12C5410AD is STC12 series, the use of RISC-type CPU core 8051 compatible instruction set common, but also new features: on-chip Flash program memory with 10k, Data Flash Data Memory 2k, RAM 512 bytes of data memory, while There are internal watchdog (WDT);-chip MAX810 special reset circuit, integrated 8-channel 10-bit resolution ADC and 4-channel PWM; with a programmable 8-level priority interrupt source 4, a system can be Programming (ISP) and Application Programmable (IAP) and other characteristics, on-chip resource-rich, highly integrated, easy to use.
STC12C5410AD the implementation of the work on the scheduling system to achieve external input parameter settings, the battery and load management, working conditions and other instructions. To make full use of chip resources, set this parameter to write the data Data Flash memory. Keyboard circuit P3.4 (T0) then F1 key, the key used to set the status identification and parameter settings; P3.5 (T1) then F2 key, the key for the self and the “plus 1” function, according to program flow , respectively, to achieve different functions. Voltage acquisition of solar panels and battery voltage acquisition management for the sun’s rays to determine the strength of, and thus can be used as daytime, evening identification signals. The system supports both solar panels reverse, reverse charge protection.
Battery voltage acquisition, recognition for the battery voltage. Micro-controller using PWM function, the battery charging management. Battery open circuit protection: if the battery open circuit, if the normal charge in the solar cell, the controller will turn off the load, to ensure that the load is not damaged, if at night or when the solar battery is not charging, the controller due to its lack of power, not there will be any action.
Overcharge Protection: charging voltage higher than the protection voltage (15V), the automatic shutdown of the battery charge; then when the voltage drop to maintain voltage (13.2V), the battery into the floating state, when less than the maintenance voltage (13.2V ) after the float off into the state are charging. When the battery voltage is lower than the protection voltage (11V), the controller automatically turns off the load switch to protect battery from damage. Through the PWM charging circuit (intelligent three-stage charging), can maximize the effectiveness of solar panels to improve the efficiency of the system charge. The system supports reverse battery, over charge, over discharge. Load output control and detection circuit design of the system two load output, the output of each channel has independent control and inspection, has improved the over-current, short circuit protection.
Solar street lamp controller connection method
Solar street lamp controller general lamp wire should be connected, followed by the battery cable, then connect the last line of solar panels.