Please design a single-page schematic in fulfillment of the below requirements:
- 1. Capable of actuating a solenoid valve with the following characteristics:
- 18 Ω coil, ~ 100mH inductance
- 28VDC ± 4V full-power actuation; 7-10VDC power-save (“hold”) actuation. 2.
- Capable of arbitrarily changing solenoid valve between full-power and power-save states.
- Ensures valve does not turn off or de-energize when switching between states.
- Capable of measuring current and voltage delivered to valve by circuit.
- Capable of automatically disabling power to valve under an overcurrent condition (eFusing)
- Capable of overriding fusing circuit to keep valve on even under overcurrent condition.
- Assume you are provided a 28V and 10V source with arbitrarily high current sourcing ability, as well 3.3V “enable” and “mode” (full/power-save) signals from a processor.
- While the interfaces in #7 must be used, you may also add additional control signals/interfaces for use with your implementation (I2C, SPI, more GPIOs, etc).
Bonus tasks (implement or argue why it isn’t worth pursuing/unnecessary):
- Overcurrent threshold is programmable.
- Include function to detect whether valve is connected (or if output is open circuit)
- Include function to identify temperature of solenoid, and therefore valve.
- Include function to identify if valve is stuck-closed or stuck-open (can happen if cryogenic)
Notional Optimizations - Aim to design the channel with the following goals and optimizations in mind:
- Minimal complexity – simplicity is key at ABL.
- Reliable – capable of withstanding rigorous thermal and vibration environments.
- Robust – expects possible misuse and failure modes without failing/being damaged.
BCAP0350 E270 T11
UC1, UC2, UC3
R5, R3, R4
2-pin header, 0.1"/2.54mm pitch
7 pin Header 0.1" / 2.54 mm Through-Hole