The solar photovoltaic industry is one of the green new energy industries that China is vigorously promoting. Because of its simple installation, low cost, and long service life, it has become more and more popular. It can be seen from the program block diagram that the solar controller is a key device of the entire photovoltaic device. It is specifically responsible for battery charging management, such as implementing overcharge protection and preventing battery current backflow and other functions. The core component of the controller is based on the LM2904's high-precision, low-power op amp, coupled with power Schottky diodes and low-voltage MOS, to form a powerful, low-cost, simple to use solar controller.

Scene application diagram

Display board photos

Solution block diagram

Product housing

Core technical advantages

ST's LM2904 is a dual op amp IC with high accuracy and extremely low static power consumption, making it ideal for new energy applications. In our scheme, a dual op amp is used to achieve two functions of battery overshoot protection and pulse charging.

Scheme specifications

Photovoltaic panel DC input voltage: 20 ~ 40V

Charging current range: 0 ~ 3A

Battery voltage specification: 24V

Key Components