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Electronic ballast having a boost converter with an improved range of output power

A technology of boost converter and ballast, which is applied to the use of electric light sources, electrical components, gas discharge lamps, etc., can solve the problems that the ballast 10 cannot be provided.

Active Publication Date: 2013-05-29
LUTRON ELECTRONICS CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, ballast 10 cannot be provided as a universal input ballast that efficiently accepts a wide range of input voltages

Method used

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  • Electronic ballast having a boost converter with an improved range of output power
  • Electronic ballast having a boost converter with an improved range of output power
  • Electronic ballast having a boost converter with an improved range of output power

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Embodiment Construction

[0049] The foregoing summary, as well as the following detailed description of the preferred embodiments, are better understood when read in conjunction with the accompanying drawings. For purposes of illustrating the invention, presently preferred embodiments are shown in the drawings, wherein like reference numerals designate like parts throughout the several views of the drawings, it being understood, however, that the invention is not limited to The specific methods and means disclosed.

[0050] Figure 7 is a simplified block diagram of an electronic dimming ballast 100 for driving a fluorescent lamp 105 in accordance with the present invention. The electronic dimming ballast 100 with figure 1 The electronic dimming ballast of the prior art operates in a similar manner and includes a number of similar modules having the same functions as previously described. Only those components of the ballast 100 of the present invention that differ from the ballast 10 of the prior ...

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PUM

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Abstract

A boost converter for an electronic dimming ballast for driving a gas discharge lamp has an increased output power range. The boost converter operates in discontinuous conduction mode when a desired intensity of the lamp is below a first threshold intensity, and operates in critical conduction mode when the desired intensity is above a second threshold intensity. The boost converter comprises a delay circuit for introducing an amount of delay into the conduction of current through the boost converter. A control circuit of the ballast is operable to drive the delay circuit and thus control the operation of the boost converter in response to the desired intensity of the lamp. The control circuit is further operable to drive the delay circuit with a pulse-width modulated signal to provide multiple amounts of delay into the operation of the boost converter.

Description

[0001] Cross References to Related Applications [0002] This application claims priority based on US Patent Application Serial No. 11 / 801,860, filed May 11,2007. The entire disclosures of the above-cited US patent applications are hereby incorporated by reference. technical field [0003] The present invention relates to electronic ballasts for controlling the brightness of gas discharge lamps and in particular to electronic dimming ballasts having a boost converter adapted to operate in an increased output power range. Background technique [0004] For lighting a gas discharge lamp, such as a fluorescent lamp, the lamp is usually driven by a ballast. Electronic ballasts receive the AC mains voltage from an alternating current (AC) power source and convert the AC mains voltage into the appropriate voltage waveform to drive the lamp. [0005] figure 1 is a simplified block diagram of a prior art electronic ballast 10 for driving a fluorescent lamp 15 . Electronic ballast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/282
CPCH05B41/2886Y02B20/202H05B41/3924H05B45/38Y02B20/00
Inventor 文卡特什·基塔亚历山大·J·罗夫南
Owner LUTRON ELECTRONICS CO INC