Ballast For Fluorescent Emergency Lighting
First Claim
1. An emergency ballast for a fluorescent lamp, comprising:
- a rechargeable battery;
a first circuit, wherein the first circuit receives an electrical current and provides a first charge to the battery,wherein the electrical current comprises one of a first amplitude and a second amplitude, and the first circuit provides the first charge to the battery without regard to whether the electrical current comprises the first amplitude and the second amplitude.
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Accused Products
Abstract
An emergency ballast for a fluorescent lamp includes a rechargeable battery. The emergency ballast also includes a circuit for receiving an electrical current and providing a recommended charging voltage to the battery. The electrical current is one of two amplitudes, and the circuit provides a charge to the battery without regard to the amplitude of the electrical current. The first amplitude of the electrical current can be 120 volts, and the second amplitude can be 277 volts. The emergency ballast includes a capacitor electrically coupled to the circuit that provides an additional voltage to the rechargeable battery when the electrical current is 120 volts. The emergency ballast also includes a switch for electrically decoupling the capacitor from the circuit when the electrical current is 277 volts.
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Citations
26 Claims
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1. An emergency ballast for a fluorescent lamp, comprising:
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a rechargeable battery; a first circuit, wherein the first circuit receives an electrical current and provides a first charge to the battery, wherein the electrical current comprises one of a first amplitude and a second amplitude, and the first circuit provides the first charge to the battery without regard to whether the electrical current comprises the first amplitude and the second amplitude. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An emergency fluorescent ballast, comprising:
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a battery; a charging circuit for charging the battery, the charging circuit comprising; an input that receives a charging current from the ballast; and a timing circuit configured to deliver the charging current to the battery for a predetermined time, the timing circuit further delivering a trickle charging current to the battery after the predetermined time. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for providing emergency power to a fluorescent lamp, comprising:
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receiving a current from mains power; converting the current from mains power to a charging current for a battery; providing the charging current to the battery for a predetermined time; providing a trickle charge after the predetermined time has elapsed; monitoring the temperature of the battery to determine whether the temperature of the battery has exceeded a predetermined temperature; and preventing the application of current to the battery in response to determining that the battery has exceeded the predetermined temperature. - View Dependent Claims (24, 25, 26)
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Specification