HIGH EFFICIENCY POWER SUPPLY FOR A TWO-WIRE LOOP POWERED DEVICE

摘要

A process control device is disclosed. The process control device comprises a measuring circuit (102) and a power regulator circuit (100). The measuring circuit (102) is coupled to the power regulator (100), and produces a control signal indicative of a measured value. The power regulator circuit (100) redirects a portion of the available power from the power regulator circuit (100) in proportion to the control signal produced by the measuring circuit (102) such that it does not limit available power to the measuring circuit (102). The process control device also may comprise a power control circuit (101) coupled to the measuring circuit (102). The power control circuit (101) redirects an amount of available power from the power regulator circuit (100) in proportion to the control signal. The process control device also comprises two or more conductors (106, 107) that are in electrical communication with the power regulator circuit (100) and the power control circuit (101). These conductors (106, 107) deliver the available power to the power regulator circuit (100) and the power control circuit (101), as well as receiving a first electric signal from the power regulator circuit (100) and a second electric signal from the power control circuit (101).