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Electronic ballast

An electronic ballast and current technology, which is applied in the use of electric light sources, electrical components, and gas discharge lamps, and can solve problems such as high lamp current crest factor and shortened lamp life

Inactive Publication Date: 2011-04-06
LUTRON ELECTRONICS CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of typical prior art valley fill circuits is that they have a large bus ripple which produces a higher lamp current crest factor which in turn reduces lamp life

Method used

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Embodiment Construction

[0052] The foregoing summary of the invention, together with the following detailed description of the preferred embodiment, is best understood when read with the accompanying drawings. For purposes of illustrating the invention, presently preferred embodiments are shown in the drawings, wherein like numerals represent like parts throughout the drawings, it being understood that the invention is not limited to the particular methods and apparatus disclosed.

[0053] Ballast Overview

[0054] see figure 2 , which shows a simplified block diagram of an electronic ballast 810 constructed in accordance with the present invention. The ballast 810 includes a rectification circuit 820, which can be connected to an AC power source of a given line frequency. A typical given line frequency for AC power is 50 Hz or 60 Hz. However, the present invention is not limited to these specific frequencies. Whenever it is said that a device is connected, coupled to, coupled in, or connectable ...

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PUM

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Abstract

The invention relates to an electronic ballast. The electronic ballast for driving a gas discharge lamp includes a rectifier, a valley-fill circuit, an inverter having first and second series-connected controllably conductive device having complementary duty cycles, a control circuit for controlling the controllably conductive device, and an independent cat ear power supply to provide power to the ballast control circuits. The result is a ballast having substantially improved THD, and current crest factor. In a preferred embodiment, the valley-fill circuit includes an energy storage device that stores energy in response to a controllably conductive device. In an especially preferred embodiment, the controllably conductive device of the valley-fill circuit is also one of the controllably conductive devices of the inverter.

Description

[0001] This application is a divisional application of a patent application with an application date of June 24, 2002, an application number of 02815996.9, and an invention title of "electronic ballast". [0002] related application [0003] This application is related to co-pending application Serial No. 09 / 887,848, filed June 22, 2001, entitled "Electronic Ballast" and copending application, filed December 5, 2001, entitled " Application Serial No. 10 / 006,036, "Single-Switch Dimming Electronic Ballast" is related to and is a continuation-in-part of said application, the entire disclosure of which is hereby incorporated by reference. technical field [0004] This invention relates to electronic ballasts for gas discharge lamps, such as fluorescent lamps. Background technique [0005] Electronic ballasts for fluorescent lamps can generally be analyzed in terms of "front-end" and "back-end". The front end generally includes: a rectifier for converting an alternating current...

Claims

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Application Information

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IPC IPC(8): H05B41/282H05B41/28
CPCH05B41/28H05B41/282Y02B20/183H05B45/375Y02B20/00
Inventor R·C·小纽曼S·德乔格M·泰帕勒D·特拉瓦格里尼J·斯皮拉
Owner LUTRON ELECTRONICS CO INC