PULSE WIDTH MODULATOR WITH EXTERNAL FEEDBACK CONTROL

摘要

An electronic device for synchronizing the movement of first and second hydraulic cylinders which includes: moving the first and second hydraulic cylinders by oil pressure; an electrovalve for varying the oil pressure to one of the hydraulic cylinders; first and second potentiometers associated with the first and second hydraulic cylinders respectively for producing a first and second voltage respectively in response to the movement of the first and second hydraulic cylinders; a pulse width module for sensing the difference between the first and second voltage and producing a pulse width modulated control signal to control the electrovalve to synchronize the movement of the first hydraulic cylinder relative to second hydraulic cylinder.