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US RE42,141 E1Granted
Electric discharge lamp device
AssigneeDenso Corporation
InventorsNoboru Yamamoto, Yukio Kunieda
Life of this patent
Estimating the term…
Abstract
An electric discharge lamp device has a lighting start voltage storage circuit for storing a lamp voltage immediately after the start of lighting of a lamp, and a change detection circuit for detecting a change in the lamp voltage by subtracting the lamp voltage immediately after the start of lighting of the lamp from the lamp voltage detected currently. The electric power supplied to the lamp is controlled based upon the change in the lamp voltage.
Claims118
An electric discharge lamp device comprising:
- lamp voltage detection means for detecting a lamp voltage and producing a lamp voltage signal:
- storage means for storing the lamp voltage signal produced from a lamp voltage detected immediately after a start of lighting a lamp;
- and
- change detection means for detecting a change in the lamp voltage by subtracting the lamp voltage signal stored in the storage means from the lamp voltage signal produced from a lamp voltage detected after the lamp voltage signal is stored in the storage means;
- and,
- control means for controlling electric power supplied to the lamp based upon the change detected by the change detection means.
3 more elements
An electric discharge lamp device comprising:
- a lamp voltage detection circuit for detecting a lamp voltage and producing a lamp voltage signal;
- a storage circuit for storing the lamp voltage signal produced from a lamp voltage detected immediately after each start of lighting a lamp;
- and
- a change detection circuit for detecting a change in the lamp voltage by subtracting the lamp voltage signal stored in the storage circuit from a lamp voltage signal produced from a lamp voltage detected after the lamp voltage signal is stored in the storage circuit;
- and
- a controller for controlling electric power supplied to the lamp based upon the change detected by the change detection circuit.
3 more elements
An electric discharge lamp device comprising:
- a storage circuit for storing a lamp voltage signal corresponding to a lamp voltage which is detected immediately after a start of lighting a lamp;
- and
- a change detection circuit for detecting a change in the lamp voltage by subtracting the lamp voltage signal stored in the storage circuit immediately after the lighting from the lamp voltage signal corresponding to the lamp voltage being detected currently,
- wherein electric power supplied to the lamp is controlled based upon the change detected by the change detection circuit;
- wherein the storage circuit stores the lamp voltage signal after an elapse of a predetermined period of time from the start of lighting the lamp as the lamp voltage detected immediately after the start of lighting the lamp, the predetermined period of time not being longer than 6 seconds.
2 more elements
An electric discharge lamp device comprising:
- a storage circuit for storing a lamp voltage signal corresponding to a lamp voltage which is detected immediately after a start of lighting a lamp;
- a change detection circuit for detecting a change in the lamp voltage by subtracting the lamp voltage signal stored in the storage circuit immediately after the lighting from the lamp voltage signal corresponding to the lamp voltage being detected currently, electric power supplied to the lamp being controlled based upon the change detected by the change detection circuit;
- and
- a timer circuit for controlling the electric power supplied to the lamp depending upon an elapse of time after the start of lighting;
- wherein the timer circuit gradually decreases the electric power supplied to the lamp depending upon the elapse of time from when the change detected by the change detection circuit has exceeded a predetermined value to be shifted to the electric power that is supplied to the lamp in a stable state;
- wherein the timer circuit gradually decreases the electric power supplied to the lamp irrespective of the change of the lamp voltage signal after elapse of a predetermined period of time from the start of lighting.
3 more elements
An electric discharge lamp device comprising:
- a storage circuit for storing a lamp voltage signal corresponding to a lamp voltage which is detected immediately after a start of lighting a lamp;
- a change detection circuit for detecting a change in the lamp voltage by subtracting the lamp voltage signal stored in the storage circuit immediately after the lighting from the lamp voltage signal detected currently, electric power supplied to the lamp being controlled based upon the change detected by the change detection circuit;
- and
- a timer circuit for controlling the electric power supplied to the lamp depending upon an elapse of time after the start of lighting,
- wherein the timer circuit gradually decreases the electric power supplied to the lamp depending upon the elapse of time from when the change detected by the change detection circuit has exceeded a predetermined value or from when a lamp voltage has exceeded the predetermined value, whichever is earlier, so as to be shifted to the electric power that is supplied to the lamp in a stable state.
2 more elements
A method of operating an electric discharge lamp device, the method comprising:
- detecting a lamp voltage and producing a lamp voltage signal corresponding to the detected lamp voltage;
- storing the lamp voltage signal corresponding to the lamp voltage detected immediately after a start of lighting a lamp;
- and
- detecting a change in the lamp voltage by subtracting the stored lamp voltage signal from the lamp voltage signal corresponding to the lamp voltage detected after the lamp voltage is stored;
- and
- controlling electric power supplied to the lamp based upon the detected change.
3 more elements
An electric discharge lamp control device for a vehicle comprising:
- present voltage detection means for detecting a present lamp voltage;
- storage means for storing a lamp voltage signal indicating the lamp voltage detected immediately after a start of lighting a lamp;
- and
- control means for controlling electric power supplied to the lamp based upon a change varying in dependence on the lamp voltage signal stored in the storage means and the lamp voltage detected by the present voltage detection means.
1 more element
An electric discharge lamp control device for a vehicle comprising:
- a lamp voltage detection circuit for detecting a lamp voltage and producing a lamp voltage signal;
- a storage circuit for storing the lamp voltage signal produced from a lamp voltage detected immediately after each start of lighting a lamp;
- and
- a controller for controlling electric power supplied to the lamp based upon a change varying in dependence on the lamp voltage signal stored by the storage circuit and a lamp voltage signal detected by the lamp voltage detection circuit after the lamp voltage signal is stored by the storage circuit.
1 more element
An electric discharge lamp control device for a vehicle comprising:
- a storage circuit for storing a lamp voltage signal corresponding to a lamp voltage which is detected immediately after a start of lighting a lamp;
- and
- a change detection circuit for detecting a change in the lamp voltage based on the lamp voltage signal stored in the storage circuit immediately after the lighting and the lamp voltage signal corresponding to the lamp voltage being detected currently,
- wherein electric power supplied to the lamp is controlled based upon the change detected by the change detection circuit;
- wherein the storage circuit stores the lamp voltage signal after an elapse of a predetermined period of time from the start of lighting the lamp as the lamp voltage detected immediately after the start of lighting the lamp, the predetermined period of time not being longer than 6 seconds.
2 more elements
An electric discharge lamp control device for a vehicle comprising:
- a storage circuit for storing a lamp voltage signal corresponding to a lamp voltage which is detected immediately after a start of lighting a lamp;
- a change detection circuit for detecting a change in the lamp voltage between the lamp voltage signal stored in the storage circuit immediately after the lighting and the lamp voltage signal corresponding to the lamp voltage being detected currently, electric power supplied to the lamp being controlled based upon the change detected by the change detection circuit;
- and
- a timer circuit for controlling the electric power supplied to the lamp depending upon an elapse of time after the start of lighting;
- wherein the timer circuit gradually decreases the electric power supplied to the lamp depending upon the elapse of time from when the change detected by the change detection circuit exceeds a predetermined value to be shifted to the electric power that is supplied to the lamp in a stable state;
- wherein the timer circuit gradually decreases the electric power supplied to the lamp irrespective of the change of the lamp voltage signal after elapse of a predetermined period of time from the start of lighting.
3 more elements
An electric discharge lamp control device for a vehicle comprising:
- a storage circuit for storing a lamp voltage signal corresponding to a lamp voltage which is detected immediately after a start of lighting a lamp;
- a change detection circuit for detecting a change in the lamp voltage varying with the lamp voltage signal stored in the storage circuit immediately after the lighting and the lamp voltage signal detected currently, electric power supplied to the lamp being controlled based upon the change detected by the change detection circuit;
- and
- a timer circuit for controlling the electric power supplied to the lamp depending upon an elapse of time after the start of lighting,
- wherein the timer circuit gradually decreases the electric power supplied to the lamp depending upon the elapse of time from when the change detected by the change detection circuit has exceeded a predetermined value or from when a lamp voltage has exceeded the predetermined value, whichever is earlier, so as to be shifted to the electric power that is supplied to the lamp in a stable state.
2 more elements
A method of operating an electric discharge lamp device, the method comprising:
- detecting a lamp voltage and producing a lamp voltage signal corresponding to the detected lamp voltage;
- storing the lamp voltage signal corresponding to the lamp voltage detected immediately after a start of lighting a lamp;
- and
- controlling electric power supplied to the lamp based upon a change varying in dependence on the lamp voltage signal stored and the lamp voltage signal detected after the storing.
1 more element
A mercury-free electric discharge lamp control device for a vehicle comprising:
- present voltage detection means for detecting a present lamp voltage supplied to a mercury-free electric discharge lamp;
- storage means for storing a lamp voltage at a time of a start of an initial stage of lighting the lamp;
- and
- control means for decreasing electric power supplied to the lamp in accordance with time when a change between the stored lamp voltage and the present lamp voltage reaches a first predetermined fixed value.
1 more element
A mercury-free electric discharge lamp control device for a vehicle comprising:
- judging means for judging whether a light flux of a lamp reaches a value in relation to substantially 80% or more of the maximum light flux;
- and
- control means for controlling electric power supplied to the lamp in accordance with time, when the judging means affirms the value having reached in relation to substantially 80% or more of the maximum light flux.
A mercury-free electric discharge lamp control device for a vehicle comprising:
- a control circuit for decreasing electric power supplied to the lamp in accordance with time in relation to a level of light flux of the lamp;
- wherein the level of the light flux is identified by a change of the lamp voltage becoming a fixed value substantially, the change being a difference between a lamp voltage stored immediately after a start of an initial stage of lighting the lamp and a present lamp voltage.
A mercury-free electric discharge lamp control device for a vehicle comprising:
- means for providing a first threshold value and a second threshold value, which is larger than the first threshold value;
- control means for controlling electric power supplied to a lamp based on a change between a lamp voltage stored immediately after a start of an initial stage of lighting the lamp and a present lamp voltage, wherein
- the control means is adapted to compare the first threshold value with the change so as to suppress overshoot of the light flux, and to compare the second threshold value with the change so as to suppress undershoot of the light flux, such that the electric power supplied to the lamp is controlled in accordance with a comparison result of the comparison to the first threshold value and the comparison to the second threshold value.
A mercury-free electric discharge lamp control device for a vehicle comprising:
- means for providing a threshold value;
- control means for controlling electric power supplied to a lamp based on a change between a lamp voltage stored immediately after a start of an initial stage of lighting the lamp and a present lamp voltage, wherein
- the control means is adapted to compare the threshold value with the change so as to suppress undershoot of light flux of the lamp, such that the electric power supplied to the lamp is controlled in accordance with the comparison result.
An electric discharge lamp control device for a vehicle comprising:
- present voltage detection means for detecting a present lamp voltage;
- storage means for storing a lamp voltage signal indicating the lamp voltage detected immediately after a start of lighting a lamp;
- and
- control means for controlling electric power supplied to the lamp based upon a change varying in dependence on the lamp voltage signal stored in the storage means and the lamp voltage detected by the present voltage detection means;
- wherein the lamp voltage signal stored in the storage means is substantially minimum voltage value in a predetermined period of time from the start of lighting the lamp.
2 more elements
A method of operating an electric discharge lamp device, the method comprising:
- detecting a lamp voltage and producing a lamp voltage signal corresponding to the detected lamp voltage;
- storing the lamp voltage signal corresponding to the lamp voltage detected immediately after a start of lighting a lamp;
- and
- controlling electric power supplied to the lamp based upon a change varying in dependence on the lamp voltage signal stored and the lamp voltage signal detected after the storing;
- wherein the stored lamp voltage signal is substantially a minimum voltage value in a predetermined period of time from the start of lighting the lamp.
2 more elements
A mercury-free electric discharge lamp control device for a vehicle comprising:
- a control circuit for controlling a decreased amount of electric power supplied to a mercury-free lamp in accordance with time in relation to a level of light flux of the lamp,
- wherein the level of the light flux is identified by a change of the lamp voltage becoming a fixed value substantially, the change being a difference between an initial lamp voltage of the mercury-free lamp detected and stored after a start of an initial stage of lighting the lamp and a present lamp voltage of the mercury-free lamp detected after detection of the initial lamp voltage.
A mercury-free electric discharge lamp control device for a vehicle comprising:
- means for providing a first threshold value and a second threshold value, which is larger than the first threshold value;
- control means for controlling electric power supplied to a lamp based on a change between a lamp voltage stored at time of a start of an initial stage of lighting the lamp and a present lamp voltage, wherein
- the control means is adapted to compare the first threshold value with the change so as to suppress overshoot of the light flux, and to compare the second threshold value with the change so as to suppress undershoot of the light flux, such that the electric power supplied to the lamp is controlled in accordance with a comparison result of the comparison to the first threshold value and the comparison to the second threshold value.
An electric discharge lamp control device for a vehicle comprising:
- a present voltage detection part configured to detect a present voltage of a mercury-free lamp;
- a storage part configured to store an initial voltage of the mercury-free lamp in an initial stage of lighting the mercury-free lamp;
- and
- a control part configured to control electric power supplied to the mercury-free lamp based on a change of the present voltage relative to the initial voltage stored in the storage part.
1 more element
An electric discharge lamp control device for a vehicle comprising:
- a present voltage detection part configured to detect a present voltage of a mercury-free lamp;
- a storage part configured to store an initial voltage of the mercury-free lamp at an initial stage of lighting the mercury-free lamp;
- a change calculating part configured to calculate a change of the present voltage relative to the initial voltage stored in the storage part;
- and
- a control part configured to control electric power supplied to the mercury-free lamp in accordance with time at which the change reaches a predetermined value.
2 more elements
An electric discharge lamp control device for a vehicle comprising:
- a present voltage detection part configured to detect a present voltage of a mercury-free lamp;
- a storage part configured to store a substantially minimum voltage value detected by the present voltage detection part in an initial stage of lighting the mercury-free lamp;
- and
- a control part configured to control electric power supplied to the mercury-free lamp based on a change of the present voltage relative to the substantially minimum voltage value stored in the storage part.
1 more element
An electric discharge lamp control device for a vehicle comprising:
- a present voltage detection part configured to detect a present voltage of a mercury-free lamp;
- a storage part configured to store a substantially minimum voltage value detected by the present voltage detection part in an initial stage of lighting the mercury-free lamp;
- and
- a control part configured to control electric power supplied to the mercury-free lamp based on the substantially minimum voltage value and the present voltage value thereby to suppress overshoot of light flux of the mercury-free lamp.
1 more element
Dependencies are inferred from the claim text.