Redundant multi-channel closed loop control device with analog i

Details Redundant multi-channel closed loop control device with analog i Redundant multi-channel closed loop control device with analog i

1990-10-26

1992-09-15

Smith, Jerry

Boots, shoes, and leggings

371 81, 364133, G05B 902

Patent

active

051483645

ABSTRACT:
A redundant closed loop control circuit has a plurality of channels, one of which is the presently active or operating channel, while the other channel (or channels) is in a standby state. When the active channel fails, the standby channel is automatically switched on. The switch-over takes place with a certain time delay determined by a time constant. For this purpose each channel has an analog integrator connected with its input to a change-over switch and with its output to a negative input of its own signal summing circuit having at least one positive input connected to the output of the other integrator of the control circuit. The integrator of the active channel receives an input signal through its change-over switch and is disconneced from the output of its own summing circuit. The integrator of the standby channel is connected to the output of its own summing circuit and disconnected from the input signal to thereby form a time delay circuit for the output signal of the integrator in the presently active channel. Thus, the outputs of all integrators are connected to operate in synchronism in a static sense, whereby there is no need for searching for a channel available for switch-over, and whereby undesirable switch-over pulses in the system are avoided due to the time delay.

REFERENCES:
patent: 3552687 (1971-01-01), Howard et al.
patent: 4560319 (1985-12-01), Blotenberg
patent: 4562528 (1985-12-01), Baba
patent: 4998194 (1991-03-01), Okamoto et al.

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