Pulse conditioning circuit for controlling electrically controllable valves in a hydraulic control apparatus

Abstract

Pulse conditioning device for electrically controlling valves in hydraulic control apparatus whereby a regulating signal is transmitted to the actuator of the respective electrically controllable valve. A filter is connected to the input side of an isolating transformer and a unidirectional rectifier is serially connected to an input side of the isolating transformer through the filter. An oscillator generates a sinusoidal output signal and a summing amplifier receives both the regulating signal and the sinusoidal signal to provide an output signal which is input to the unidirectional rectifier. To complete a modular pair of identical circuits for the control circuit, a second unidirectional rectifier is serially connected to a second filter and also connected to the output side of the isolating transformer. The second filter provides a zero offset compensation, and an output buffer amplifier is connected to the output of the second filter for producing an output signal which is the regulating signal for the actuator of the electrically controllable valve.

Dependencies are inferred from the claim text.