Charging control guidance module for alternating-current charge spot of electric vehicle and guidance method of charging control guidance module

Abstract

The invention discloses a charging control guidance module for an alternating-current charge spot of an electric vehicle. The charging control guidance module comprises a positive voltage reference module, a negative voltage reference module, a level conversion module, an output tracing module, a detection module and a charging guidance controller, wherein guidanceguidancethe level conversion module is connected with the positive voltage reference module, the negative voltage reference module, a first power supply voltage and a PWM (pulse width modulator) module, the output tracing module is connected with the first power supply voltage, a second power supply voltage and the level conversion module, and the detection module is connected with the first power supply voltage and the output tracing module, and the charging guidance controller is connected with the detection module and the PWM module. The invention also discloses a charging control guidance method applied to the charging control guidance module for the alternating-current charge spot of the electric vehicle. According to the invention, the requirement of an accuracy of a power supply is reduced, the output PWM waveform is relatively high in quality and stability, a real-time and synchrous detection on the output wave can be much easier to realize, and the module and the method are simple and practical for use.

Description

technical field [0001] The present invention relates to electric vehicle charging and discharging technology, and more specifically, the present invention relates to a charging control guidance module for an electric vehicle AC charging pile and a charging control guidance method thereof. Background technique [0002] With the increasing popularity of electric vehicles, the charging system of electric vehicles has gradually attracted more and more people's attention. The problem that needs to be considered when conducting conductive charging for vehicles is: before using the charging interface for charging, it is necessary to confirm and test the charging Whether the interface has been reliably connected, and charging without complete connection may easily cause electric shock hazards; during the charging process, the power supply needs to output a PWM guide wave with a certain duty cycle through the charging interface to control the on-board charger. The duty cycle of the w...

AI Technical Summary

Problems solved by technology

[0002] With the increasing popularity of electric vehicles, the charging system of electric vehicles has gradually attracted more and more people's attention. The problem that needs to be considered when conducting conductive charging for vehicles is: before using the charging interface for charging, it is necessary to confirm and test the charging Whether the interface has been reliably connected, and charging without complete connection may easily cause electric shock hazards; during the charging process, the power supply needs to output a PWM guide wave with a certain duty cycle through the charging interface to control the on-board charger. The duty cycle of the waveform can be adjusted in real time to adjust the charging current. At the same time, the output waveform and the connection status of the charging interface can be monitored in real time. Once an abnormal situation occurs, the power supply should be cut off immediately

The disadvantages of this scheme are: 1. The edge time of the output PWM waveform is long (junction capacitance limit), and the output is prone to overshoot glitch due to the positive and negative switching of the input waveform during the push-pull output; 2. The output waveform Positive and negative voltages are the power supply voltage, which requires high accuracy and stability of the power supply voltage, resulting in increased power supply costs

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