3 results about "Carrier frequency synchronization" patented technology

This application provides an inverter carrier frequency synchronization method, a power grid system, a charging pile, and a storage medium, belonging to the field of power technology. The method includes: acquiring an inductor sampling current, which is obtained by sampling a filter inductor located at the power output terminal of the target inverter according to a preset sampling frequency; determining the actual current ripple based on the inductor sampling current; and adjusting the actual carrier frequency of the target inverter in response to the actual current ripple and the theoretical high-frequency ripple component satisfying a preset carrier frequency adjustment condition. The carrier frequency adjustment condition indicates that the error between the actual current ripple and the theoretical high-frequency ripple component is within a preset component error range, so that the actual carrier frequency and the desired carrier frequency of the target inverter are within the frequency error range. This application embodiment can achieve carrier frequency synchronization between parallel inverters while considering deployment difficulty, application cost, and synchronization stability.

The application provides a carrier frequency synchronization method applied to a frequency hopping data transmission system, the frequency hopping data transmission system comprising a transmitting end and a receiving end, and the method comprises the following steps: the transmitting end processes to-be-sent data into a data frame, adds a pilot head based on a ZC sequence to the data frame to form a frequency hopping data transmission frame, and sends a radio frequency signal carrying the frequency hopping data transmission frame to the receiving end; the receiving end acquires the radio frequency signal, processes the radio frequency signal into a digital signal; carrier synchronization processing is performed on the digital signal, carrier frequency scanning is performed on multiple frequency hopping points to screen effective communication frequency points; the starting position of the data frame is determined according to the effective communication frequency points, data demodulation and decoding are performed on the data frame, and original data is recovered. Through the application, the excellent autocorrelation characteristics of the ZC sequence and the intelligent double-peak detection mechanism are utilized to realize carrier frequency synchronization without strict time synchronization, and fast and anti-interference data transmission is completed.