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Ballast circuit

A circuit and ballast technology, applied in the field of ballast circuits, can solve the problems of lamps not operating alone, mismatching, harmful effects of work, etc.

Inactive Publication Date: 2004-02-04
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The power delivered by the ballast does not match the lamp load
adversely affect the operation of each parallel-connected lamp still in operation
In other words, the lamp cannot be operated alone

Method used

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Examples

Experimental program
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Embodiment Construction

[0020] The drawings show preferred embodiments of the invention. In this preferred embodiment, n=2. The same parts and elements in the figures are designated by the same numerals and letters, have the same structure and the same operation.

[0021] see figure 1 , 2(G), 2(b) and 2(c), the ballast output circuit 10 includes at least two series-connected devices of an inductor L and a capacitor C connected to both ends of the square wave generator 13. Square wave generator 13 is preferably, but not limited to, a half-bridge inverter generating voltage E (ie, the output voltage of the inverter). A lamp load 16 is connected across each capacitor C through a switch SW. The switch SW is only for displaying the pre-ignition and ignition status of the simulated lamp. The current I flowing through each inductor L includes a fundamental frequency component If1 and a third harmonic component I3f1 of the fundamental frequency. Other currents with higher odd harmonics are present, but ...

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Abstract

An electronic ballast for powering at least two rapid start, parallel connected fluorescent lamps. Associated with each lamp is a serially connected choke and capacitor combination. A train of pulses of alternating polarity having a fundamental frequency, which is generated by an inverter, is applied to each serially connected combination. Each combination is characterized by a resonant frequency which is other than an odd harmonic of and at least two times the fundamental frequency. Reduction in filament heating, following lamp ignition, is provided through the addition of voltages applied to each filament which are substantially out of phase with each other.

Description

technical field [0001] The present invention relates to a ballast circuit for igniting and operating a lamp, comprising: [0002] voltage generating means for generating a voltage of frequency f1, [0003] The load circuit is coupled with the voltage generating device and includes a first series device composed of a first inductance device and a first capacitor device, and the first series device has a first resonant frequency f10, wherein the quantitative relationship between f1 and f10 is nf1 <f10<(n+1)f1, where n is an even integer. Background technique [0004] Such a ballast circuit is known from EP 0 583 838 A2. The voltage of frequency f1 generated by the known ballast circuit has the same frequency f1 during ignition and operation and is substantially rectangular wave. When n=2, the lamp is ignited by the third harmonic of the voltage at frequency fl. The lamp is then operated by the same voltage at frequency f1. Therefore, existing ballast circuits are si...

Claims

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Application Information

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IPC IPC(8): H05B41/24H05B41/282H05B41/285
CPCH05B41/2856H05B41/2828Y10S315/05
Inventor C·B·梅特斯R·A·埃哈特
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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