This paper proposes a hardware circuit design based on STC microcontroller learning platform, adopts a new type of single-chip model STC12C5410AD, and adds some serial interface chips to the learning platform. The interface standards include RS-232, SPI, IIC, 1-wire and so on. Learning platform design goals: ISP programmable, LCD display, calendar clock (IIC interface chip), temperature measurement (1-wire interface chip), FLAH memory (SPI interface chip), button (wax change scan button), voltage measurement (AD conversion).
1 hardware system overview
The learning platform is based on STC12C5410AD, and the structure is shown in Figure 1.
1.1 Introduction to STC12C5410AD Microcontroller
STC12C5410AD single-chip microcomputer is an enhanced single-chip microcomputer which is introduced by Hongjing Technology on the basis of the standard 8051 microcontroller core. It is an enhanced 8051 microcontroller, single clock / machine cycle, operating voltage 5.5V - 3.5V, operating frequency range 0 ~ 35MHz, 512 bytes of on-chip data memory, 10K bytes of on-chip Flash program memory, ISP (in the system Programming) / IAP (programmable in the application), can directly download the program through the serial port, EEPROM function, 6 16-bit timer / counter, PWM (4 channels) / PCA (programmable counter array, 4 channels), 8 channels and 10 bits A/D conversion, SPI synchronous communication port.
2 hardware system design
2.1 crystal, power supply and reset circuit
2, 3, and 4 are a reset circuit, a power supply circuit, and a crystal oscillator circuit, respectively. The RST network label in the reset circuit is connected to pin 3 of the STC12C5410AD microcontroller, which is powered-on reset. Since the operating voltage of the STC12C5410AD microcontroller is between 5.5 and 3.5V, the power supply uses a 5V switching power supply. For accurate AD conversion, an LM7805 regulator chip is added.
The off-grid inverter is an inverter used in off-grid solar power generation systems. Its main function is to convert the direct current generated by solar panels into alternating current to meet the power demand in off-grid environments, such as in remote areas, In camping, boats, or moving vehicles.
Main effect:
Converts the direct current generated by solar panels into alternating current to supply the power needs of homes, mobile devices, or other electrical appliances.
Off-grid inverters are usually equipped with battery energy storage systems, which store excess power so that they can continue to supply power when the solar panels cannot generate enough power.
Differences from On-Grid Inverter:
Connection method: Off-grid inverter is an inverter used in the off-grid system and does not need to be connected to the grid. They are often used in places where there is no access to the grid, such as remote areas, wild camping, or outlying islands.
Grid requirements: Unlike on-grid inverters, off-grid inverters do not need to meet grid requirements and standards because they are not connected to the grid. They can operate independently and can be adapted to different off-grid environments.
Self-sufficiency: The off-grid inverter is equipped with a battery energy storage system, which can store excess electricity so that it can continue to supply electricity when the solar panels are unable to generate electricity. This makes the off-grid system self-sufficient and not dependent on an external grid for power.
Application scenarios: Off-grid inverters are widely used in remote areas, camping, ships, mobile vehicles, and some special-purpose scenarios. On the other hand, grid-connected inverters are mainly used in home, commercial, and industrial photovoltaic power generation systems connected to the grid.
In general, the main function of the off-grid inverter is to convert the direct current generated by the solar panels into alternating current to meet the power demand in the off-grid environment and achieve self-sufficiency by being equipped with a battery energy storage system. In contrast, on-grid inverters connected to the grid are mainly used to integrate solar power into the grid, realize the interaction between solar power and the grid, and comply with the requirements and standards of the grid.
off grid solar inverter,off grid 3 phase inverter, off grid solar power inverter, off grid solar inverter 5kw, off grid solar inverters for sale
Ningbo Autrends International Trade Co., Ltd. , https://www.aitsolarpanels.com