Led-based emergency lighting equipment and methodology

A brown-out detection apparatus comprising:

• a voltage sensing circuit sensing an input AC voltage, said input AC voltage having a first nominal input voltage value or a second nominal input voltage value, said voltage sensing circuit including an output outputting a reference DC voltage proportional said input AC voltage;
• a first circuit responsive to said output of said voltage sensing circuit, said first circuit including a first output outputting a first voltage value when said input AC voltage is below a threshold voltage level and a second voltage value when said input AC voltage is above said threshold level;
• and
• a second circuit responsive to said first output of said first circuit, said second circuit including a second output outputting a second control signal indicative of a brown-out condition of said input AC voltage based on said first or second voltage value output of said first circuit and an internal brown-out threshold value.

A brown-out detection method comprising:

• sensing an input AC voltage having a first nominal input voltage value or a second nominal input voltage value;
• outputting a reference DC voltage proportional said input AC voltage;
• outputting in response to said reference DC voltage a first voltage value when said input AC voltage is below a threshold voltage level, or a second voltage value when said input AC voltage is above said threshold level;
• and
• outputting a second control signal indicative of a brown-out condition of said input AC voltage based on said first or second voltage value and an internal brown-out threshold value.