Igniting device for a high-pressure discharge lamp capable of battery voltage compensation
AssigneeKabushiki Kaisha Toshiba
InventorsMitsutoshi Kimura, Yasuhiro Nieda
Life of this patent
Estimating the term…
Abstract
In an operating apparatus of a high-pressure discharge lamp of the invention, power is supplied to a heater provided in a high-pressure discharge lamp from a battery. The battery is charged by a charger which is driven by a power section. The power section is started by an ON operation of a switch which is turned on/off synchronously with the operation of a control switch. The control switch allows power supply from the battery to the heater when it is turned on. Therefore, always while power is supplied to the heater, the battery is being charged by the charger so that the voltage of the battery will not be lowered.
Claims20
An operating apparatus for a high-pressure discharge lamp having a light-emitting tube and a heater, said operating apparatus receiving power from a power source having a battery, charging means for charging the battery, and charging switch means for causing said charging means to start and stop the charging of said battery, said operating apparatus comprising:
- operating circuit means, including light switch means independent of heater operation and lighting circuit means, for receiving the power supplied from said power source and for generating a predetermined output only when said light switch means is turned on so as to start and maintain an ON state of said light-emitting tube;
- heater switch means, operated independently of said light switch means, for causing said heater to operate independently of an operating state of said light switch means;
- and
- heater control means for enabling power to be supplied to said heater by turning on said heater switch means only when said charging means is operated, and for turning off said heater switch means whenever said charging switch means is turned off.
An operating apparatus for an automobile head light having a light-emitting tube and a heater, said operating apparatus receiving power from a power source having a battery, charging means for charging the battery, and charging switch means for causing said charging means to start and stop the charging of said battery, said operating apparatus comprising:
- operating circuit means, including light switch means independent of heater operation and lighting circuit means, for receiving the power supplied from said power source and for generating a predetermined output only when said light switch means is turned on so as to start and maintain an ON state of said light-emitting tube;
- heater switch means, operated independently of said light switch means, for causing said heater to operate independently of an operating state of said light switch means;
- and
- heater control means for enabling power to be supplied to said heater by turning on said heater switch means only when said charging means is operated, and for turning off said heater switch means whenever said charging switch means is turned off.
An operating apparatus for high-pressure discharge lamps, each lamp having a light-emitting tube and a heater, said operating apparatus receiving power from a power source having a battery, charging means for charging the battery, and charging switch means for causing said charging means to start and stop the charging of said battery said operating apparatus comprising:
- operating circuit means, including light switch means independent of heater operation and lighting circuit means, for receiving the power supplied from said power source and for generating a predetermined output only when said light switch means is turned on so as to start and maintain an ON state of said light-emitting tubes, said operating circuit means further including means for outputting, in turn, said predetermined outputs to each of said light-emitting tubes;
- heater switch means, operated independently of said light switch means, for causing said heaters to operate independently of an operating state of said light switch means;
- and
- heater control means for sequentially enabling power to be supplied to each of said heaters from said power source by turning on said heater switch means only when said charging means is operated, and for turning off said heater switch means whenever said charging switch means is turned off.
Dependencies are inferred from the claim text.