Techniques are provided for improving power efficiency of a multiphase direct current (DC)-DC voltage converter configured to provide DC power to a time domain duplexing radio by enabling a number of phases during a downlink subframe and disabling the number of phases on or after cessation of the downlink subframe.

A field device having first and second input terminals connected to first and second wires of a network; first and second output terminals connected to first and second wires of a sensor unit; a rectifier unit having a first part arranged between the first input terminal and a first node and a second part arranged between the second input terminal and a second node, wherein the first node is connected to the first output terminal. A current measurement device measures a current between the second node and a third node. A voltage measurement device measures a voltage between the first node and the second node. A first semiconductor is arranged between the first node and the third node and configured to pass a bypass current so that the measured current comprises a two-part curve; and a second semiconductor arranged between the third node and the second output terminal.

Techniques are provided for improving power efficiency of a multiphase direct current (DC)-DC voltage converter configured to provide DC power to a time domain duplexing radio by enabling a number of phases during a downlink subframe and disabling the number of phases on or after cessation of the downlink subframe.

A plant power supply system includes a power conversion system and a busbar box, where the busbar box is provided with a direct current (DC) busbar, the power conversion system being connected to the DC busbar, and the DC busbar being further connected to an electrical device, where the power conversion system is configured to convert alternating current (AC) power input from an external AC power source into DC power; and the DC busbar is configured to transmit the DC power to the electrical device, and receive discharge energy from the electrical device and return the discharge energy to the electrical device.