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Crest factor reduction method for electronically ballasted lamps

A technology of crest factor and electronic ballast, which is applied in the use of gas discharge lamps, electric light sources, electrical components, etc., and can solve problems such as sudden changes

Inactive Publication Date: 2012-09-05
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the output voltage of the intermediate stage powering the lamp to jump to a higher level for a brief period of time

Method used

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  • Crest factor reduction method for electronically ballasted lamps
  • Crest factor reduction method for electronically ballasted lamps
  • Crest factor reduction method for electronically ballasted lamps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] refer to figure 1 , the electronic ballast 10 includes a rectification circuit 12 that converts an alternating current (AC) voltage to a direct current (DC) voltage. Rectification circuit 12 is coupled to AC power source 14 via positive voltage terminal 16 and neutral terminal 18 . Typically, the line frequency of the AC power supply is 50 Hz or 60 Hz. The rectification circuit 12 converts the AC input voltage into a full-wave rectified voltage. The rectification circuit 12 is connected to a step-down converter 20 which is a direct current (DC) voltage to direct current (DC) voltage converter. A filter capacitor or capacitors 22 is connected across the positive and ground inputs 30 and 32 of the buck converter 20 . Positive and negative output terminals 34 and 36 of buck converter 20 are coupled to input lines 38 and 40 of inverter circuit 44 . Inverter circuit 44 converts DC to AC. A crest factor reduction circuit 46 is coupled to the buck converter positive outpu...

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PUM

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Abstract

A buck converter generates a direct current (DC) bus voltage at a buck converter output. An inverter circuit is coupled to the buck converter and configured to receive the generated DC voltage and convert the DC voltage into an alternating current (AC) voltage to drive a lamp. A power control circuit is coupled to the buck converter output and configured to provide a control voltage signal to thebuck converter so that the buck converter generates the DC voltage and current of a predetermined value. A crest factor reduction circuit is coupled (a) to the buck converter output to sense a rate of change in the generated DC bus voltage, and (b) to the power control circuit to modify the control voltage signal based on the sensed rate of change in the DC bus voltage.

Description

technical field [0001] This exemplary embodiment relates to an electronic ballast. It finds particular application in connection with high intensity discharge lamps (HID) and will be described with specific reference thereto. However, it will be appreciated that this exemplary embodiment may also be compatible with other electrically ballasted lamps, such as fluorescent lamps and the like. Background technique [0002] A ballast is an electrical device used to supply power to a load such as an electric discharge lamp and regulate its current. The ballast provides high voltage to start the lamp, causing ionization of the gas which starts the arc forming process. Once the arc is established, the ballast allows the lamp to continue operating by supplying an appropriately controlled current to the lamp. [0003] An important indicator of the lamp current quality of a high intensity discharge lamp is the current crest factor (CCF) of the lamp current. A low CCF, ie a CCF clos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/288
CPCY02B20/202H05B41/2886Y02B20/00
Inventor 路易斯·R·尼罗恩拉茨洛·S·伊尔耶斯
Owner GENERAL ELECTRIC CO