US 9,194,891 B2 · Root mean square detector and circuit breaker using the same

Abstract

The present disclosure relates to a RMS detector for directly computing a signal detected through an analog circuit to measure its RMS value, and a circuit breaker using the same. For this purpose, a RMS detector according to the present disclosure may include a plurality of voltage/current sensing units configured to detect a voltage or current shaped analog signal for an arbitrary load; a plurality of square circuit units configured to compute square function units, respectively, based on a voltage output from the plurality of voltage/current sensing units; a summing circuit unit configured to sum a plurality of output voltages output from the plurality of square circuit units, respectively; and a root circuit unit configured to compute a RMS value based on a voltage output from the summing circuit unit.

Claims9

Dependent claims

A Root Means Square (RMS) detector, comprising:

a plurality of voltage/current sensing units configured to detect a current-shaped analog signal of an arbitrary electric load and to convert the detected current shaped analog signal into a voltage-shaped analog signal;
a plurality of square circuit units each configured to compute a square function based on a voltage output from one of the plurality of voltage/current sensing units;
a summing circuit unit configured to sum a plurality of voltages output from the plurality of square circuit units;
and
a root circuit unit configured to compute an RMS value based on a voltage output from the summing circuit unit,
wherein each of the plurality of square circuit units comprises:
a square function unit configured to compute the square function;
a root function unit configured to compute a root function;
and
a differential circuit configured to subtract an output current of the root function unit from an output current of the square function unit.

7 more elements

A circuit breaker, comprising:

a voltage/current sensing unit configured to detect a voltage-shaped or current-shaped analog signal of an arbitrary electric load;
a Root Means Square (RMS) detector configured to compute an RMS value based on an output voltage of the voltage/current sensing unit;
and
a comparator configured to compare the computed RMS value with a preset reference voltage and to control a switching operation of the circuit breaker,
wherein the RMS detector comprises:
a square circuit unit configured to compute a square function based on the output voltage of the voltage/current sensing unit;
a summing circuit unit configured to sum a plurality of voltages output from the square circuit unit;
and
a root circuit unit configured to compute an RMS value based on a voltage output from the summing circuit unit, and
wherein the square circuit unit comprises:
a square function unit configured to compute the square function;
a root function unit configured to compute a root function;
and
a differential circuit configured to subtract an output current of the root function unit from an output current of the square function unit.

11 more elements

Dependencies are inferred from the claim text.

Root mean square detector and circuit breaker using the same

Life of this patent

Root mean square detector and circuit breaker using the same

Life of this patent

Abstract

Claims9