Method for monitoring a power output stage

Details Method for monitoring a power output stage Method for monitoring a power output stage

2007-01-09

2007-01-09

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

C324S415000, C324S421000, C324S762010, C324S762010, C363S127000

Reexamination Certificate

active

10844990

ABSTRACT:
A method for monitoring a power output stage including at least one half bridge with upper and lower semiconductor switches connected in series, wherein the semiconductor switches are controllable alternately to a switched-on state and a switched-off state by pulse-width modulated pulses, includes measuring a first voltage across the lower semiconductor switch when the upper semiconductor switch is switched on and measuring a second voltage across the lower semiconductor switch when the lower semiconductor switch is switched on, comparing a difference between the operating voltage and the first voltage to a predetermined voltage and comparing the second voltage with the predetermined voltage, which is the maximum permissible voltage across a semiconductor switch when it is switched on, and determining that the power output stage or the output of the at least one half bridge is faulty when at least one of the difference and the second voltage is greater than the predetermined voltage.

REFERENCES:
patent: 5933341 (1999-08-01), Kuriyama et al.
patent: 6297661 (2001-10-01), Chen et al.
patent: 6661192 (2003-12-01), Copeland
patent: 6847532 (2005-01-01), Villaret
patent: 2003/0067795 (2003-04-01), Dubhashi
patent: 2004/0257017 (2004-12-01), Bay et al.
patent: 39 37 447 (1991-05-01), None
patent: 103 20 926 (2004-12-01), None

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