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DFCI circuit breaker

Products and reference designs
Block diagram

DFCI circuit breaker

Block diagram

Overview

Cost optimized sensing architecture enable reliable arc fault and ground fault detection. High speed comparators capture realtime fault conditions. Embedded analog MCUs enable compact solution size.

Design requirements

  • Compact solution size 
  • Fast startup
  • Current sensing front ends to detect high frequency arc signatures and low level leakage currents
  • Cost optimized

Block diagram

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DFCI circuit breaker

Ground fault current sensing analog front-end Ground fault current sensing analog front-end AMP AMP Current sensing analog front-end Current sensing analog front-end AMP AMP AMP AMP AMP AMP Signal conditioning Signal conditioning Logarithmic Logarithmic HPF HPF LPF LPF Comparator Comparator Comparator Comparator Current Current 1 1 1 Comparator Comparator Comparator Comparator Reference Reference Power stage Power stage N N L L 5.0V 5.0V 3.3V 3.3V Self-diagnostics/monitoring Self-diagnostics/monitoring Supervisor watchdog Supervisor watchdog CT, Rogowski, or Shunt CT, Rogowski, or Shunt CT CT N N L L Non-isolated AC/DC power supply Non-isolated AC/DC power supply LDO LDO DC/DC DC/DC Sensing Sensing Current injection Current injection Solenoid or relay drive Solenoid or relay drive AMP AMP Voltage sensing analog front-end Voltage sensing analog front-end Reference Reference Voltage Voltage Miswiring Miswiring Comparator Comparator AMP AMP Precision or isolated ADC Precision or isolated ADC For metering For metering Output-user interface Output-user interface LED Drivers LED Drivers Digital processing Digital processing Comparator Comparator ADC ADC Timer Timer GPIO GPIO GPIO GPIO ADC ADC Serial Serial GPIO GPIO ADC ADC Wireless interface Wireless interface Micro/BLE SoC Micro/BLE SoC

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