Equipment and methods for emergency lighting that provides brownout detection and protection
First Claim
1. An emergency lighting unit comprising:
- a converter capable of receiving a wide range of input voltages, the wide range of input voltages comprising at least three different input voltages; and
a brownout detection component capable of detecting a brownout condition by comparing an input voltage received by the converter with a brownout threshold value determined using a sample actual voltage level of the input voltage, wherein the brownout threshold value has different values where the sample actual voltage level corresponds to different ones of the at least three different input voltages.
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Abstract
The present invention relates to systems, equipment and methods that provide emergency lighting and allow the detection of brownout conditions. One aspect of the present invention is an emergency lighting system with an input voltage interface for receiving an input voltage, a brownout detection component for detecting a brownout condition on the input voltage and generating a brownout signal, a switch mode power converter for altering the input voltage; and an emergency lighting control and battery charging component for controlling the charging of a battery pack and receiving the brownout signal. Another aspect of the invention is a method of providing emergency lighting performed by receiving an input voltage; automatically establishing a brownout threshold relative to the input voltage; and detecting a brownout condition.
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Citations
12 Claims
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1. An emergency lighting unit comprising:
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a converter capable of receiving a wide range of input voltages, the wide range of input voltages comprising at least three different input voltages; and a brownout detection component capable of detecting a brownout condition by comparing an input voltage received by the converter with a brownout threshold value determined using a sample actual voltage level of the input voltage, wherein the brownout threshold value has different values where the sample actual voltage level corresponds to different ones of the at least three different input voltages. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An emergency lighting unit comprising:
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a converter receiving an input voltage and capable of receiving a wide range of input voltages; and a brownout detection component; determining a brownout threshold value using a sample actual voltage level of the input voltage, wherein different brownout threshold values are determined for different values of the sample actual voltage level of the input voltage; and detecting a brownout by comparing the input voltage with the brownout threshold value. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification