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US 7,923,934 B2Granted
Battery-powered fluorescent lamp
AssigneeTechtronic Power Tools Technology Limited
InventorsSamuel Boyles, David Elsea
Life of this patent
Estimating the term…
Abstract
A lamp includes a light source, a power tool battery for providing a DC voltage level, and a base for housing the power tool battery. A stem is coupled to the base and supports the light source. A power inverter converts the DC voltage level to an AC voltage level, and a current sensing circuit operatively coupled to the converter or the inverter senses an over-current condition when the converter or the inverter draws more than a predetermined amount of current. The converter or inverter is disabled if the over-current condition continues for more than a predetermined amount of time so that the light source receives the AC voltage level and is illuminated for the predetermined amount of time before power is removed.
Claims25
A lamp having a light source, comprising:
- a base;
- a power tool battery providing a DC voltage level, the battery releasably connected to the base;
- a power inverter for converting the DC voltage level to an AC voltage level;
- a current sensing circuit operatively coupled to a voltage converter and the power inverter;
- and
- the current sensing circuit comprising a current sensing device configured to sense an over-current condition when the power inverter draws more than a predetermined amount of current;
- and
- the current sensing circuit including a delay circuit positioned along an over-current signal path between the current sensing device and the power inverter,
- wherein, in response to a sensed over-current condition,
- the current sensing device outputs an indication of the over-current condition to the delay circuit along the over-current signal path, and
- the delay circuit delays the indication of the over-current condition such that an over-current signal is output to the power inverter after a predetermined amount or time, and
- wherein, via the delayed over-current signal, the power inverter is disabled or the DC voltage level is disconnected when the over-current condition continues for more than the predetermined amount of time so that the light source receives the AC voltage level and remains illuminated for the predetermined amount of time before power is removed.
9 more elements
A lamp having a light source, comprising:
- a base;
- a power tool battery providing a first DC voltage level, the battery releasably connected to the base;
- a voltage converter configured to convert the first DC voltage level to a second DC voltage level;
- a power inverter for converting the second DC voltage level to an AC voltage level;
- a current sensing circuit comprising a current sensing device operatively coupled to the voltage converter and the power inverter, and configured to issue an over-current signal when the voltage converter or the power inverter draws more than a predetermined amount of current or power;
- and
- the current sensing circuit including a delay circuit positioned along an over-current signal path between the current sensing device and one of the voltage converter and the power inverter, wherein the delay circuit is configured to receive an indication of an over-current condition from the current sensing device to disable the voltage converter or the power inverter after a predetermined amount of time for the light source to receive the AC voltage level and remain illuminated for the predetermined amount of time before power is removed.
4 more elements
A battery-powered lamp having a light source, comprising:
- a base;
- a power tool battery providing a first DC voltage level, the battery releasably coupled to the base;
- a stem coupled to the base and configured to support the light source;
- a voltage converter configured to convert the first DC voltage level to a second DC voltage level;
- a power inverter for converting the second DC voltage level to an AC voltage level, the AC voltage level provided to the light source;
- a current sensing circuit operatively coupled to the voltage converter and the power inverter;
- the current sensing circuit comprising a current sensing device configured to sense an over-current condition when the voltage converter or the power inverter draws more than a predetermined amount of current;
- and
- the current sensing circuit including a delay circuit positioned along an over-current signal path between the current sensing device and the voltage converter or the power inverter;
- wherein, in response to a sensed over-current condition,
- the current sensing device outputs an indication of the over-current condition to the delay circuit along the over-current signal path, and
- the delay circuit delays the indication of the over-current condition such that an over-current signal is output to the voltage converter or the power inverter after a predetermined amount of time, and
- wherein, via the delayed over-current signal, the voltage converter or power inverter is disabled when the over-current condition continues for more than the predetermined amount of time so that the light source receives the AC voltage level and remains illuminated for the predetermined amount of time before power is removed.
10 more elements
A battery-powered lamp having a light source, comprising:
- a power tool battery providing a first DC voltage level;
- a base for housing the power tool battery;
- an electrical socket for receiving the light source;
- a hollow stem configured to couple the base with the electrical socket and provide an electrical connection between the battery and the electrical socket;
- a voltage converter configured to convert the first DC voltage level to a second DC voltage level;
- a power inverter for converting the second DC voltage level to an AC voltage level, the AC voltage level provided to the light source;
- a current sensing circuit operatively coupled to the voltage converter and the power inverter;
- the current sensing circuit comprising a current sensing device configured to issue an over-current signal when the voltage converter or the power inverter draws more than a predetermined amount of current or power;
- the current sensing circuit including a delay circuit positioned along an over-current signal path between the current sensing device and one of the voltage converter and the power inverter, wherein the delay circuit is configured to receive an indication of an over-current condition from the current sensing device and disable the voltage converter or the power inverter in response thereto;
- and
- wherein the delay circuit outputs the over-current signal after a predetermined amount of time to disable;
- and the voltage converter or the power inverter for the light source to receive the AC voltage level and remain illuminated for the predetermined amount of time before power is removed.
9 more elements
Dependencies are inferred from the claim text.