| 摘要 |
The present invention relates to a solid-state relay (200; 300) electrically actuated to disconnect/connect a first portion of an electrical circuit (102) from/to a second portion of said electrical circuit (IV, M). The relay comprises:
- at least one power semiconductor switch device (T1) connected between a first electrical terminal (1) of the relay connected to the first electrical circuit portion (102) and a second electrical terminal (2) of the relay connected to the second electrical circuit portion (IV, M), respectively, by means of respective conductive terminals (D, S), and having a command terminal (G),
- an electronic driving block (203, DV) of the at least one semiconductor switch device (T1) configured to generate a command signal (S) applied to the command terminal (G) to switch the at least one semiconductor switch device (T1) from a closed/open state to an open/closed state to disconnect/connect the first electrical circuit portion (102) from/to the second portion of the electrical circuit (IV, M);
- an electronic block for detecting a current (I) which crosses the at least one power semiconductor switch device (T1). Such an electronic detection block comprises:
a first electronic device (301; 201) having a first input (3) and a second input (4) connected to the first (1) and second (2) electrical terminals, respectively, configured to generate a first signal (S1) indicative of a difference of potential between the first (1) and second (2) terminals generated by the current (I) which crosses a total resistance (Rtot) present between the first (1) and second (2) terminals of the at least one power semiconductor switch device (T1) in the closed state,
wherein such a total resistance (Rtot) comprises the sum of a first resistance (RDSon) associated with the semiconductor switch device (T1) in the closed state and of second bonding resistances (R B ) associated with an electrical connection between one of the conductive terminals (D,S) and the respective either first (1) or second (2) electrical terminal,
and wherein the electronic driving block is configured to receive an opening/closing control signal (S E ), to further receive an enabling/disabling signal according to the first signal (S1), and is further configured to generate said command signal (S) on the basis of the opening/closing control signal (S E ) and of the enabling/disabling signal. |
