TWO-STAGE ELECTROHYDRAULIC FEED BACK POWER AMPLIFIER Russian patent published in 2009 - IPC F15B9/03 

FIELD: machine building.

SUBSTANCE: proposed power amplifier is designed for aircraft electrohydraulic automatic control systems. The amplifier comprises the 1^st adding operating amplifier with its one input receiving the control signal and the other one being connected, via matching hardware, with the feed back transducer signal winding. It includes also the electronic power amplifier with its output connected to the electro mechanic converter, 1^st stage hydraulic control valve communicating with intake and discharge lines and, via two hydraulic lines, with the 2^nd stage hydraulic valve control chambers. The 1^st correcting device is arranged at the 1^st adding operating amplifier. The output of the former is connected to one of the inputs of the 2^nd adding operating amplifier. The 2^nd output of the latter is connected to the output of the 3^rd electronic correcting device with its input being connected to the output of matching hardware. The output of the 2^nd electronic correcting device is connected to the electronic power amplifier input.

EFFECT: improved static, dynamic and power performances of hydraulic amplifier.

1 dwg