Fail Check Device and method for switching signal lines

Details Fail Check Device and method for switching signal lines Fail Check Device and method for switching signal lines

1996-07-10

1998-04-07

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

322 28, 324416, 324511, 324503, 361 23, H02H 7122

Patent

active

057371997

ABSTRACT:
A fail check device and method for switching signal lines, wherein PWM signals are sent out onto PWM signal lines through a PWM signal output/survey circuit. Based on the level of the PWM signals to be sent out and the level of the PWM signals actually sent out, a PWM mismatch signal (logical) is produced. The produced PWM mismatch signal (logical) has a value which indicates a fault when the PWM signal lines are in a state of breakage or short circuit to a ground or the PWM signal lines in a predrive circuit are short-circuited to the positive wiring of a power source. Therefore, by using the PWM mismatch signal (logical), a breakage in the PWM signal lines or a fault in the predrive circuit can be detected by a control CPU.

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