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Hey guys, I've been assigned a little project for an extra-cirricular activity though I'm not sure where to start. It involves making an economiser circuit for a contactor to make it more efficient. I'm not sure where to start, I think a schametic might help. Any suggestions?

Objectives

• Design a circuit for an efficient economizer that will operate between 9-32V.
• Peak and hold
• Provide a constant current source.
• Use Digikey, LCSC, and/or Mouser, electronics distributors for parts.
• The PCB must fit around the contactor in a small, confined space. It must have a very small form factor.
• Have the inputs only be power and ground for minimal wiring.
• Calculate the power consumption of the circuit.

Contactors

Contactor 1: 2272229-1

• Minimum 550ma pull in and 170ma hold MINIMUM, may vary from unit to unit

Contactor 2: 2138622-1

• Minimum 333ma pull in and 160ma hold, these are minimums and may vary from unit to unit

Both contactors:

• 25ms pull in time minimum
• Operating voltage for input circuit is 9-32v, 9v min is contactor maximum pull in voltage
• 32v is highest expected supply voltage
• Must regulate current - not just PWM