Charging-and-discharging control device

Abstract

The invention discloses a charging-and-discharging control device which comprises a motor, an electric driving circuit, a power supply voltage sampling circuit, a charging-and-discharging current sampling circuit and a control chip, wherein the control chip is used for transmitting a first pulse width modulation (PWM) driving signal to the electric driving circuit. The first PWM driving signal is used for making the electric driving circuit store electric energy of an external power supply into an inductor of the motor and charge a battery by means of the electric energy stored in the inductor of the motor. Alternatively the control chip is used for transmitting a second PWM driving signal to the electric driving circuit, wherein the second PWM driving signal is used for making the electric driving circuit store the electric energy of the battery into the inductor of the motor and performing electric energy feedback to the external power supply by means of the electric energy stored in the motor. The charging-and-discharging control device provided by the invention facilitates cost reduction of the charging-and-discharging control device and reduces land occupation area.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a charge and discharge control device. Background technique [0002] Electric vehicles have the advantages of high efficiency, energy saving, low noise, and zero emissions. They are the development trend of new energy vehicles in the future. However, the promotion of electric vehicles is still limited by the mileage and charging technology. At present, most electric vehicles use large-capacity batteries. Although it can increase the cruising range of electric vehicles, it also puts forward higher requirements for charging electric vehicles. There are two commonly used charging methods, namely AC slow charging and DC charging. fast charge. The AC slow charging method converts AC power into DC power through the power conversion device fixedly installed inside the electric vehicle to charge the power battery of the electric vehicle; the DC fast charging method converts AC power in...

AI Technical Summary

Problems solved by technology

[0003] The inventor of this technical solution found in the research process that in the existing AC slow charging solution, since the on-board charger and the electric drive power conversion device are independent of each other, limited by the space of the vehicle, the power of the charger is not large, and the charging efficiency is low. The time is long, and in the DC fast charging scheme, the cost of the power conversion device is high and the area occupied is large

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