Control circuit for an electronic switch, and a switch constitut

Details Control circuit for an electronic switch, and a switch constitut Control circuit for an electronic switch, and a switch constitut

1997-10-10

1998-06-09

Callahan, Timothy

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327312, 327389, 361 56, 361191, 361111, H03K 1708, H02H 320

Patent

active

057640882

ABSTRACT:
The control path of the switch (I) comprises an input stage (T2, T1) having an input (H) coupled to the input (E) for the control signal and having its output coupled to the control electrode (G) of the switch (I). A protection circuit (D1, Z2) coupled between the load (C) and the control path includes a threshold effect component (Z2) and a decoupling element (D1). On being made conductive by the current that results from a surge generated in a circuit of the load (C), the protection circuit (D1, Z2) is coupled to the input (H) of said input stage (T2, T1) to act on said switch (I) in the same way as a control signal for the switch (I). In this manner, the control path prevents current in the load (C) from dropping off suddenly.

REFERENCES:
patent: 4355341 (1982-10-01), Kaplan
patent: 4588904 (1986-05-01), Glogolja
patent: 4949213 (1990-08-01), Sasagawa et al.
patent: 5210479 (1993-05-01), Kimura et al.
patent: 5347169 (1994-09-01), Preslar et al.
patent: 5581432 (1996-12-01), Wellnitz et al.
patent: 5587865 (1996-12-01), Bielig et al.

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