Valve Drivers

HED’s pulse width modulated (PWM) and solenoid Valve Drivers are pre-engineered, modularized electronic printed circuit boards that serve as power amplifiers to drive proportional valves, motor, pumps, or any device that requires PWM signals.

Function
The valve drivers operate by processing a low power analog input signal to produce a corresponding high power, high efficiency PWM output signal, as required.

These PWM signals consist of pulses created by switching between zero voltage and the full supply voltage, within a pre-determined cycle time. The percent of time that supply voltage is furnished during each pulse cycle varies proportionally to the input signal, thereby creating a modulated, proportional signal as its output.

HED Valve Drivers are available in two basic configurations:

• Single Direction of Control (Half Axis Controller): Converts a single analog signal to a PWM output. Ex: Controlling a hydraulic dump valve.
• Bi-Directional Control (Single Axis Controller): Provides two complimentary outputs (either PWM or Solenoid On/Off) from one analog input. Ex: Controlling a valve to operate a double-acting cylinder.

Features and Options:

• Short Circuit (Overload) Protection
• Operating Voltages 10 to 30 VDC
• 20 to 1000 Hz PWM Frequency Range
• Input Signal Voltages 0 to 30 VDC
• Maximum Current: 2.5 amps*
• Operating Temperature -40°C to +85°C
• Storage Temperature:-55°C to +100°C
• All PC Boards coated with Silicon Conformal Coating

*High current and Current Feedback options available

Digital and Analog versions of the different valve drivers mentioned above are available.

Specifications for a typical programmable Digital Valve Driver (DVD) (requires pdf viewer).