Pulse width modulated constant current servo driver

Details Pulse width modulated constant current servo driver Pulse width modulated constant current servo driver

F - Mech Eng,Light,Heat,Weapons

15

B

342/24, 342/38

F15B 9/09 (2006.01) B60T 8/1761 (2006.01) F15B 11/00 (2006.01)

Patent

CA 1158345

PULSE WIDTH MODULATED CONSTANT CURRENT SERVO DRIVER Abstract of the Disclosure A method and apparatus for controlling a coil operated hydraulic valve employs a constant current source to consistently control valve response irrespective of variations in power supply voltage and coil resistance. A switching circuit controls the delivery of constant current pulses from the current source to the coil in accordance with a series of pulse width modulated control signals whose duty factors are proportionate to preselected values of hydraulic output pressures developed by the valve. A voltage regulator circuit provides regulated supply voltage to the constant current source in order to reduce variations in the coil current at small pulse widths.

383882

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