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System for operating lamp

A technology with working characteristics and half cycle, which is applied in the direction of lamp circuit layout, lighting device, light source, etc., and can solve the problem of ballast circuit losing pulse voltage and so on

Inactive Publication Date: 2004-12-08
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this known system, the encoding means completely truncates or reduces the amplitude of the entire half-cycle, so that there are missing pulses or pulses of significantly reduced voltage in the rectified DC output of the rectifier included in the ballast circuit

Method used

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  • System for operating lamp
  • System for operating lamp
  • System for operating lamp

Examples

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Embodiment Construction

[0028] The fluorescent lamp ballast circuit shown in Figure 1 includes an EMI and triac damping filter "A" connected to a full-bridge input rectifier "B" which together transform the sinusoidal AC mains voltage to rectified and filtered output voltage. A pre-conditioner circuit "C" includes circuitry for improving the effective power factor and boosting and controlling the direct current (DC) voltage from rectifier circuit B across a pair of DC rails RL1 and RL2. The ballast circuit includes a DC-AC converter or inverter "E" and a controller "G" for controlling the inverter. The inverter E is a half-bridge structure, which provides high-frequency lamp current to the lamp La connected to the inverter E under the control of the half-bridge controller or the driver circuit G. In the embodiment shown in Fig. 1, means I for generating lamp current is formed by a filter "A", a rectifier "B", a pre-processor circuit "C" and an inverter "E". The controller G forms means II for contr...

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PUM

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Abstract

A communication method particularly suited for lighting control employs encoding of perturbations in a voltage signal having a fundamental period with a nominal waveform. A control period includes a pre-selected number of fundamental periods of the voltage signal. Different control commands are indicated by imposing a selected perturbation, such as a phase cut, on the nominal waveform with a respective occurrence signature within the control period. The control commands are decoded from the voltage signal by detecting the occurrence signature of the perturbations within each control period. Decoding is accomplished by differentiating the nominal waveform to detect encoded perturbations. The technique is particularly suited for two-wire dimming applications for gas discharge lamps, in which the voltage signal carrying the encoded commands is the sinusoidal mains voltage powering the ballast, since the encoded perturbations may be small enough so that lamp flicker is avoided even with encoded signals on the line voltage.

Description

technical field [0001] The invention relates to a system for operating a lamp comprising: [0002] Two input terminals connected to a sinusoidal supply voltage source; [0003] encoding means connected to said input terminal for perturbing a portion of a predetermined number of sinusoidal supply voltage half cycles which together form a control period; [0004] ballast circuit, which includes: [0005] a ballast input terminal connected to said encoding device for receiving a perturbed sinusoidal supply voltage during lamp operation; [0006] Means I for generating lamp current from a perturbed sinusoidal supply voltage; [0007] means II connected to means I for controlling the operating characteristics of the lamp in accordance with the control signal; [0008] A decoding device that generates a control signal based on the shape of the control cycle. [0009] The invention also relates to encoding means and ballast circuits for use in such systems. Background techniqu...

Claims

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Application Information

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IPC IPC(8): H05B41/38H05B37/02H05B41/36H05B41/392
CPCH05B37/0263H05B41/36H05B41/3921H05B47/185
Inventor 夏永平S·维基塔什伯雷曼尼恩R·杰亚雷曼T·法卡斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV