Solar street lamps provide convenience for people to travel and reduce energy consumption for the earth on which human beings depend. They are green, energy-saving and environment-friendly products.
There is a very important component in the solar street light--
Solar street lamp controller, solar street lamp
controller coordinates the work of various components, making the whole solar photovoltaic system operate efficiently and safely.
So, what are the hardware components of the solar street lamp controller?
Next, the source solar street lamp technicians will answer for us: 1. Power input part the power input part includes the reverse connection protection circuit which can protect the input of mains supply, the input of storage battery and the input of solar battery, and the switching circuit of charge and discharge and power supply.
The charging and discharging and power supply switching circuits realize the switching between the mains power supply and the battery power supply, as well as the charging control of the battery and the discharge control of the battery by the solar cell. At the same time, supply power to MOSFET voltage stabilization and short circuit protection circuit in output part.
2. Data acquisition and display control part data acquisition and display control part includes control buttons, LED display circuit, voltage and current acquisition, temperature acquisition, photosensitive acquisition and equalization circuit.
The control keys include test keys, menu selection keys and parameter selection keys. The test button can make the controller enter the test state;
The menu selection key is used to select the working mode. Every time you press the Menu Selection Key, the mode value will be changed once, and the corresponding parameters in this mode will also be displayed. At this time, press the parameter selection button to set the operating parameters in this mode;
Important data such as the operation mode and parameters of the system are stored in the chip, and will not be lost after power failure, which makes the adjustment more convenient and the system work more reliable.
The LED display circuit includes the status display of 5 light emitting diodes and the operation parameter display of 2 digital tubes, five LED light emitting diodes are used to display the working states of solar cells, storage batteries, mains, load 1 and load 2, the two digital tubes display the mode and the parameters in this mode respectively when parameter setting is carried out, and display the temperature when parameter setting is not carried out.
Voltage acquisition, current acquisition, temperature acquisition and photosensitive acquisition respectively complete the acquisition of battery and solar cell voltage, discharge current, temperature state and illumination, these signals are processed by ARM processor, and the voltage and current acquisition circuit is controlled by ARM processor to control whether the equalization circuit works.
3. ARM processor part of ARM processor adopts Philips ARM chip LPC2134, which is a high-end 32-bit real-time processor and is at the core of the whole system.
Analyze and process the data collected by the acquisition module, make corresponding decisions, control the charging and discharging and power supply switching circuit, voltage and current acquisition circuit, MOSFET voltage stabilization and short circuit protection circuit and soft switch, realize charge and discharge control of battery, protection control of controller and on-off control of output load.
When the solar cell cannot supply power to the load normally, the mains will pass through the charge and discharge and power supply switching circuit, voltage stabilizing and short circuit protection circuit and soft switch on the controller, the access method that can automatically supply power to the load alone instead of directly adding mains to the battery can reduce the damage caused by mains to the battery and mains power, and can effectively reduce the power configuration of mains power.
The whole switching process realizes soft switching, which will not impact the load and battery, and the load work will not be affected.
4. Output part the output part includes MOSFET voltage stabilization, short circuit protection circuit and soft switch.
Under the control of ARM processor, MOSFET voltage stabilizing and short-circuit protection circuits realize short-circuit protection and voltage stabilizing output, and soft switch realizes independent on-off control of dual outputs.
The above is the explanation of the hardware components of the solar street lamp controller, which mainly consists of power input, data acquisition and display control, ARM processor and output components.
The controller has Keys and display circuits, which can conveniently set the operation mode and operation parameters, and the display circuit can also intuitively display the current operation State.
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