Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Integrated structure
Patent
1995-12-05
1997-07-29
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Integrated structure
327 77, 327 88, H03K 524
Patent
active
056525400
ABSTRACT:
A power semiconductor device (4) has a main current carrying section (4a) with a number of parallel-connected active device cells (5) and a first main electrode (6) coupled to a first terminal (2), a second main electrode (7) connected to a second terminal (3) and a control electrode (8) and a sense current carrying section (4b) with at least one sense cell (5a) similar to the active device cells (5) and having a first main electrode (6) coupled to the first terminals (2) and a second main electrode (9). A current sensing arrangement (10) has a first resistor (R1) coupling the second main electrode (9) of the sense current carrying section (4b) to the second terminal (3), a second resistor (R2) similar to the first resistor (R1) and a current source (11) coupled in series with the second resistor to the second terminal (3) for supplying a reference current (Ir) through the second resistor (R2). A comparator (12) compares the voltages across the first and second resistors (R1 and R2) to provide an output signal (0) to indicate when the current through the main current carrying section ( 4a) reaches a predetermined value.
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Biren Steven R.
Callahan Timothy P.
Lam T.
U S Philips Corporation
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