Visible indication of mistaken lamp use
AssigneePanasonic Corporation
InventorsKazuhiko Itou, Masayoshi Gyoten, Shiro Iida
Life of this patent
Estimating the term…
Abstract
A lamp includes an arc tube and a lighting unit for lighting the arc tube. The lighting unit includes a rectifier circuit, a smoothing circuit for partial smoothing, and an inverter circuit having a pair of switching elements. The smoothing circuit smoothes portions of the output voltage of the rectifier circuit below the first voltage value and outputs a voltage that falls between the first voltage value and the second voltage value. The discharge sustaining voltage of the arc tube is set to fall between the first and second values of the voltage Vdc output from the smoothing circuit.
Claims13
A lamp with a rated voltage of 277 volts, comprising:
- a light-emitting unit including one or more light-emitting diodes;
- and
- an electronic lighting circuit including:
- a lighting unit operable to cause the light-emitting unit to illuminate in a manner to visually indicate to a user that the illumination is normal, when an effective source voltage of 277 volts is supplied;
- and
- a lighting control unit operable to cause the light-emitting unit to flash on and off, when an effective source voltage of 120 volts, which is different from the rated voltage, is supplied.
A lamp with a rated voltage of 277 volts, comprising:
- a light-emitting unit including one or more light-emitting diodes;
- and
- an electronic lighting circuit including:
- a lighting unit operable to cause the light-emitting unit to illuminate in a manner to visually indicate to a user that the illumination is normal, when the lamp is used by being connected to a 277 volt distribution line;
- and
- a lighting control unit operable to cause the light-emitting unit to flash on and off, when the lamp is used by being connected to a 120 volt distribution line, which is different from the 277 volt distribution line.
Dependencies are inferred from the claim text.