Non-isolated power architecture with diagnostics reference design for protection relay modules
Description
This reference design showcases non-isolated power supply architectures for protection relays with analog input/output and communication modules generated from 5-: 12-: or 24-V DC input. To generate the power supplies the design uses DC/DC converters with an integrated FET: a power module with an integrated inductor for size- and design-time-constrained applications: a HotRod™ package type for applications requiring low EMI and linear regulators (LDOs) for low ripple. Protections include a flat clamp TVS for input transient protection: an eFuse with configurable load current for overload protection and an ideal diode controller for input reversal protection. Additional features include an auto-switching power MUX: an analog temperature sensor: an input OK indication: a “no load” detection and a voltage supervisor.
Features
- Power supplies for communication module: multiple non-isolated supply rails with varying load currents up to 1.5 A using a DC/DC converter with low IQ and EMI: DC/DC converter in HotRod™ package and DC/DC converter with Eco-mode™Power supply for analog Input/output modules: ±12-V split-rail supply for analog IO modules generated from a 24-V wide input synchronous buck converter: split rail DC/DC converters andLDOs and a ±10.5-V split-rail supply generated from 24 V using power modules with an integrated inductor in inverted buck configurationPerformance testing:Tested analog IO power supply performance by interfacing to high accuracy AC analog input and DC analog output reference designsTested communication module power supply performance by interfacing to RS-485 EVMs: CAN EVMs and 10/100 ethernet reference design or 10/100/100 copper or fiber interface EVMPre compliance testing: tested power supply for electrical fast transients (EFT) and surge per IEC61000-4 and radiated emission per CISPR22
Applications
- String inverter
- Digital multimeter (DMM)
- Solar power optimizer
- Micro inverter
- Aircraft cockpit display
- Flight control unit
- Interconnect/distribution box
- Lab & field Instrumentation
- Fault indicator (FI)
- AC charging (pile) station
- Central inverter
- DC fast charging station
- Multifunction relay
- Battery energy storage system
- Power conversion system (PCS)
- Solar arc protection
- Solar charge controller
- Rapid shutdown
- Smart combiner box
- Remote power distribution automation
- Grid asset monitoring
- AC analog input module
- Processor module
- Wired communication modules
- Compact relay
- Expansion module
- Contractor circuit
- DC fast charging power module
- Substation automation
- Circuit breaker (ACB
- MCCB
- VCB)