For many years, designers in industrial, medical and other systems have introduced isolation in order to meet safety regulations or reduce the noise of grounding loops. Current isolation ensures that data transmission is not through electrical connections or leakage paths, thus avoiding safety risks. However, isolation will bring limitations on latency, power consumption, cost and size. The goal of the digital isolator is to meet the safety requirements while minimizing the adverse effects. At present, digital isolators are widely used in smart home and medical equipment and other environments with high security requirements.
The development of smart home is becoming more and more popular, and it begins to combine various intelligent and green energy systems. Maintaining the normal operation of these systems and ensuring the safety of operators must rely on an important device - digital isolator. The isolation solution provides perfect protection at the high and low voltage ends of the system, which can effectively improve the performance, flexibility and reliability of the power system.
Compared with the familiar semiconductor devices such as general microcontrollers (MCU) and wireless protocol chips, which control the functions of the device, the isolator can be said to be a guardian of the system, blocking the risk factors that may damage the whole system, and at the same time preventing users from being injured by the high voltage of the system. Therefore, many different isolators are used in the interior of PV inverters, electric vehicle charging piles, intelligent instruments, water, electricity, gas and heat intelligent instruments, video monitoring systems and energy storage devices that are increasingly common in families.
As the requirement of energy conservation has been increasingly rooted in the hearts of consumers, it has also driven the new development trend of isolation products, and began to shift to more efficient, lower cost, and smaller size CMOS digital technology, so as to meet the demand of intelligent systems for power saving and reliability.
PV inverter is the most typical isolator in smart home system. The PV inverter converts the DC power collected by the PV panel into AC power and feeds it into the main power network. The working time is expected to exceed 25 years, and the operating environment is harsh. In case of any failure of the system, it will affect not only the personal or family safety, but also the entire power network. It can be seen that the PV inverter has very strict requirements for safety, reliability and stability.