What is a device which compare a current signal and voltage signal and give me one output or two.

The discussion addresses the challenge of comparing an AC current signal (e.g., 5A) with an AC voltage signal (e.g., 1V) and producing one or two outputs. It is noted that direct comparison of current and voltage signals is complex and requires conversion to a common domain, typically voltage. A proposed solution involves using a resistive burden network to convert current transformer (CT) outputs into voltage signals suitable for comparison. An op-amp comparator circuit is suggested, where the input voltage (converted from current via burden resistor) is compared against a reference voltage (VREF) to generate a digital output indicating whether the input is above or below the threshold. The burden resistor must be appropriately sized to handle power dissipation (e.g., 10W for high current). For detecting different CT outputs (e.g., 100A:0.333V, 100A:1V, and 100A:5A), the circuit can be adjusted by setting the reference voltage and burden resistor values accordingly. Additional circuit elements like Schottky diodes and hysteresis resistors can improve peak current detection and comparator stability. Precision voltage references such as MCP1541 (4.096V) and MCP1525 (2.5V) are mentioned for setting accurate thresholds. The approach assumes known CT ratings and load currents for correct threshold setting. The discussion emphasizes the need for more detailed specifications to tailor the solution effectively.
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