| 摘要 |
The invention relates to a field device for detecting or monitoring a physical or chemical process variable of a medium in automation technology, having a power output (6), which is arranged on the primary side (P), and having an electronics unit (3, 13) which is arranged on the secondary side (S) and is supplied with energy from the primary side (P) via two connecting lines (4), wherein the electronics unit (3) actuates the power output (6) such that the direct current flowing on the connecting lines (4) represents the value of the process variable which is detected on the secondary side (S), having at least one communications unit (7) which provides digital data (Data), and having a galvanically decoupled transmission means (9) which transmits the digital data (Data) between the primary side (P) and the secondary side (S), wherein a circuit arrangement having two switches of a primary-side switch pair (11) is provided, wherein one switch of the primary-side switch pair (11) is arranged in each connecting line (4), having two switches of at least one secondary-side switch pair (12), wherein one switch of the secondary-side switch pair (12) is arranged in each connecting line (4), having an intermediate energy storage means (18), which is arranged between the primary side (P) and the secondary side (S), and a secondary-side energy storage means (19) which is associated with the secondary side (S), wherein the two energy storage means (18, 19) are connected in parallel to one another, and having at lea one electronic control circuit (14) which alternately actuates the switch pairs (11, 12) such that the primary side (P) and the secondary side (S) are galvanically disconnected from one another. |
