I'm working on a project which will require the construction of a current source capable of producing rapid current changes in a DC inductor. I'm working with a proportional valve having a 13 ohm, 0-1000mA DC coil. The valve will respond only as quickly as I can drive the current up or down. E.G. applying 13 volts across it results in a quarter-second delay while the armature magnetizes, whereas breaking the circuit drives the valve shut hard with no hesitation.
Any pointers as to what sort of design concepts might work best for this? Perhaps some sort of freewheeling half bridge having a bus voltage substantially higher than 13 volts? Would a full H-bridge work any better than a half bridge for driving the current down rapidly? Or would I be better off with some manner of circuit to regulate the forward voltage drop across a suitably large series transistor to act as a variable 'brake' resistor?
Any pointers as to what sort of design concepts might work best for this? Perhaps some sort of freewheeling half bridge having a bus voltage substantially higher than 13 volts? Would a full H-bridge work any better than a half bridge for driving the current down rapidly? Or would I be better off with some manner of circuit to regulate the forward voltage drop across a suitably large series transistor to act as a variable 'brake' resistor?