Control and guidance system used for alternating current charging pile for electric vehicles

Abstract

The invention discloses a control and guidance system used for an alternating current (AC) charging pile for electric vehicles. The integrated control and administration of the AC charging pile are realized by the combination between an STM32F207 chip and modules connected with the STM32F207 chip. By means of a PWM signal isolation modulator circuit, a CP positive voltage signal detection isolation circuit and a CP negative voltage signal detection isolation circuit, a full voltage segment detection is achieved, and the real-time monitor of PWM positive-negative full voltage variations is realized. The STM32F207 chip directly controls a relay to output the charging power supply and an intermediate relay is removed, so that the cost is reduced effectively and the reliability is improved.

Description

technical field [0001] The invention relates to a charging pile control system, in particular to a control and guidance system for an electric vehicle AC charging pile. Background technique [0002] Electric vehicle charging pile is a power station for electric vehicles. Its function is similar to that of a fuel dispenser in a gas station. Each charging pile is equipped with a charging plug. The charging pile can charge various types of electric vehicles according to different voltage levels; electric vehicles The charging pile adopts AC and DC power supply methods, which require a special charging card to be used, and the display screen of the charging pile can display data such as charging amount, cost, and charging time; the human-computer interaction interface of the AC charging pile adopts a large-screen LCD color touch screen , charging can be rotated in four modes: constant power, fixed time, fixed amount, and automatic (until full); the AC working voltage of the char...

AI Technical Summary

Problems solved by technology

[0003] Today, with the support of new energy policies, the demand for new energy vehicles in my country has increased sharply, and my country is a country short of oil resources. In recent years, the extensive use of traditional fuel vehicles has intensified the dependence on non-renewable oil resources. A large amount of harmful exhaust gas, facing the dual pressure of energy demand and environmental protection, the development of electric vehicles is the strategic demand of our country, which makes the demand for charging piles also increase rapidly; but today's charging piles have simple functions, poor compatibility, and the current Some charging piles adopt multiple modules cascaded control to form the whole system. This mode of combining the functions of each module is costly and the overall reliability is not high; the detection of the PWM control signal of the existing charging piles is only for positive voltage. detection, ignoring the abnormal impact caused by negative voltage changes; and the control output of the charging power supply of the existing charging pile uses an intermediate relay to control the output of the charging power supply. The reliability is not high; and the existing charging pile only completes the charging function of the vehicle, and does not process information for the identification and monitoring of various vehicles, which is not in line with the current technological development route of big data analysis and processing

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