Safety control device and process with analog power output
AssigneeMatra Transport
InventorsPhilippe Forin, Didier Minesi
Life of this patent
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Abstract
The safety control device with digital input and analog output, is intended to deliver a mean output power above a specified threshold when two binary input sequences which are complementary or in phase opposition are applied to the input and an output power appreciably below the threshold in all other cases. It comprises a primary voltage source (18) supplying a cascade of several modules (16.sub.1 , . . . , 16.sub.k) each having an AC converter bridge and a rectifier, each branch of the AC converter bridge being controlled by one of the sequences.
Claims7
Fail safe control device having a digital input and an analog power output, for delivering a mean output electrical power which is above a first predetermined threshold when two binary input sequences which are complementary, in mutual phase opposition, are applied to the digital input and a mean output power which is below a second predetermined threshold, lower than the first threshold in all other cases, comprising:
- one primary DC voltage power source, and
- a cascaded arrangement of a plurality of modules each having, in succession, AC converter bridge means and rectifier means, an input of said cascaded arrangement being connected to said primary power source for energization by said primary power source and each said AC converter bridge means having two branches each individually controlled by one of said binary input sequences.
A method for fail safe control of a digital actuator responsive to an enabling digital signal consisting of two binary sequences which represent a correct code when mutually complementary and are uncorrelated in any other case, comprising subjecting an output of a DC power voltage to a cascade of steps each having a transformation into an AC voltage and a rectification, each transformation being performed with an electrical bridge circuit having two branches, each of the branches including two switches, and controlling the two switches in each one of the branches by one same sequence among said two sequences which is applied directly to one of the switches and is inverted before being applied to the other switch.
Dependencies are inferred from the claim text.