Real-Time Voltage Drop Compensation Method With Cable Impedance Detection Capability for Remote Power Supply Systems

Abstract

When a power supply runs for a remote load through long cables, a voltage drop will occur due to the cable impedance. To maintain sufficient load voltage, the compensation of the cable voltage drop is necessary. In this letter, a real-time voltage drop compensation method with cable impedance detection capability is proposed. This method does not require additional auxiliary components, and the detection of cable impedance can be realized by simply adjusting the position of the filter capacitor. Further, this method can implement cable voltage drop compensation by controlling the cable current, and then realize real-time accurate control of the remote load voltage by setting the correction period. Compared with traditional methods, this method operates at the power supply side, does not affect the system efficiency and power density, and is not limited by cable parameters and environmental factors, which is more attractive in engineering applications.