PWM signal optimization method and device for charging process of charging pile, equipment and medium

Abstract

The invention provides a PWM signal optimization method for a charging process of a charging pile. The PWM signal optimization method comprises the steps of initializing a prediction equation, carrying out prediction processing and updating a state. The invention relates to electronic equipment and a storage medium which are used to execute the PWM signal optimization method for the charging process of a charging pile. The invention further relates to a PWM signal optimization device for the charging process of the charging pile. A Kalman filtering algorithm used by the invention can process the sampling data in real time, occupies a small memory, does not need to reserve other historical data except the previous state quantity, is high in calculation speed, and conducts new value estimation of the current state according to a specified recursion method only by combining the estimated value calculated by combining the previous state on the basis of the state equation of the system andthe measured value after new data is measured.

Description

technical field [0001] The invention relates to the technical field of AC charging for electric vehicles, in particular to a PWM signal optimization method, equipment, medium and device in the charging process of a charging pile. Background technique [0002] During the AC charging process of electric vehicles, the charging pile is connected to the vehicle socket through the connection mode C, and the vehicle handshake confirmation is carried out by judging the voltage change between the CP and PE of the connector. During the charging process, the controller of the charging pile sends out a PWM frequency of 1KHZ signal, on-board chargers and charging pile controllers judge the maximum output current and connection status by judging the amplitude and duty cycle of the PWM signal. Due to the different lengths of charging cables in the actual use environment and the difficulty in controlling the grounding quality of the power distribution system, it leads to The PWM signal is m...

AI Technical Summary

Problems solved by technology

[0002] During the AC charging process of electric vehicles, the charging pile is connected to the vehicle socket through the connection mode C, and the vehicle handshake confirmation is carried out by judging the voltage change between the CP and PE of the connector. During the charging process, the controller of the charging pile sends out a PWM frequency of 1KHZ signal, on-board chargers and charging pile controllers judge the maximum output current and connection status by judging the amplitude and duty cycle of the PWM signal. Due to the different lengths of charging cables in the actual use environment and the difficulty in controlling the grounding quality of the power distribution system, it leads to The PWM signal is mixed with interference such as noise and glitches

Images