Abstract
This paper presents a high-power dual-module parallel charging system which consists of a power converter and digital control software. The power converter consists of an active power factor correction (APFC) circuit and a resonant voltage fed full-bridge converter (RVFFBC). The APFC circuit is used for AC/ DC conversion and power factor correction for improved power quality. The RVFFBC is used to provide stable power for charging the battery by converting the high voltage of the power stage to a lower value. The system software was designed by combining the power control loop into a voltage and current loop to achieve current sharing of the dual-module charging system and to overcome the effect of differences in hardware components. Finally, this paper demonstrates the implementation of a high-power dual-module charging system with a widely varying AC input voltage ranging from 85 ~ 265 Vac. Experimental results verified that the maximum power factor of the system and the Total Harmonic Distortion (THD) were 0.99 and 2.8% respectively. The proposed charging system possesses very high expansibility. The parallel dual-module output DC current of the system is 70 A and the total output power is 4 kW.
Highlights
With the increase in the use of devices such as laptops, mobile phones, tablet PCs, etc., lithium batteries have gradually replaced lead-acid batteries as the power source of choice
Traditional AC-DC converters consist of a bridge rectifier and a filter capacitor
active power factor correction (APFC) circuits use the Pulse Width Modulation (PWM) scheme, which leads to the input current and voltage waveforms having approximately the same phase
Summary
With the increase in the use of devices such as laptops, mobile phones, tablet PCs, etc., lithium batteries have gradually replaced lead-acid batteries as the power source of choice. Traditional AC-DC converters consist of a bridge rectifier and a filter capacitor The advantages of such converters are simplicity of the circuit structure and ease of control. They exhibit serious nonlinear distortion, which causes the power factor to be reduced, and affects the device and power network equipment. It affects the quality of the overall electrical supply system. This leads to poor power grid stability and power loss. The correction capability of PPFC circuits is low and they are unable to meet standard requirements. Current APFC circuits can achieve power factors in the range of 0.98~1, which enhances the power conversion efficiency and power quality of high-power high-current charging systems
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