Self-adaptation control method of pulse-modulated signal in electric vehicle charging

Abstract

The invention relates to a self-adaptation control method of a pulse-modulated signal in electric vehicle charging. The method comprises the following steps of: (1) reading a maximum supply current set by a current power supply unit, and judging; (2) detecting a signal at a charging part connected with a vehicle until the signal is 6V; (3) calculating a duty ratio of a corresponding national standard pulse modulation signal for testing the maximum supply current Itest* 90%; (4) continuously detecting a charge current until a time counter is increased to be setting time; (5) if the charge current is consistent with national standards, carrying out a step (6), and if the charge current is consistent with IEC61851-1 standards, carrying out a step (7); (6) adjusting a PWM (Pulse-Width Modulation) signal according to the national standards, and carrying out a step (8); (7) adjusting the PWM signal according to the IEC61851-1 standards, and carrying out a step (8); (8) continuously judging standards met by the current; and (9) setting the duty ratio of the PWM signal corresponding to an Imax current, and outputting. According to the self-adaptation control method of the pulse-modulated signal in electric vehicle charging, an electric vehicle can be charged quickly and safely, and the ability of products adapting to different charge standards is improved.

Description

technical field [0001] The invention relates to an adaptive control method of a pulse modulation signal in electric vehicle charging, and belongs to the technical field of electric vehicle charging control. Background technique [0002] At present, as energy and the environment have become the most concerned issues in the world, electric vehicles, as an important carrier of transportation transformation and green transportation, have received extensive attention and great attention from all countries in the world. [0003] my country has been actively promoting the development of electric vehicles since 2000. There are inconsistencies between the national standard and the SAEJ1772 and IEC61851-1 standards of the American Society of Motor Vehicle Engineers in terms of the definition of the pulse modulation signal (PWM) for the charging interface. [0004] The national standard defines the PWM duty cycle as follows: [0005] The power supply equipment receives the upper load ...

AI Technical Summary

Problems solved by technology

[0008] Due to inconsistent standards, power supply equipment manufacturers need to consider different software and hardware designs for different standards when designing and manufacturing, which increases the cost of charging equipment development and also poses safety hazards

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