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Electric discharge lamp operating device, lighting equipment and lighting system

A technology for lighting devices and discharge lamps, applied in the field of lighting systems, can solve the problems of flickering, long time consumption, etc.

Inactive Publication Date: 2010-02-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] But, like Figure 16 As in the middle period T1, since the voltage across the discharge lamp DL (lamp voltage) decreases after the discharge lamp DL is discharged, the inductance Lr for resonance becomes a current-limiting factor in the next period T2 when the operating frequency is increased, causing the discharge lamp The current (lamp current) flowing through the DL is insufficient, and extinguishment occurs as shown in period T3. As a result, the discharge lamp flickers at startup, or it takes too long to achieve stable lighting of the discharge lamp DL.

Method used

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  • Electric discharge lamp operating device, lighting equipment and lighting system
  • Electric discharge lamp operating device, lighting equipment and lighting system
  • Electric discharge lamp operating device, lighting equipment and lighting system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0071] In this embodiment, if figure 1 As shown, there are: DC power supply circuit 1, which uses AC power supply AC to generate DC power; converter circuit 2, which converts the DC voltage output by the DC power supply circuit into AC voltage, and supplies it to the discharge lamp. The discharge lamp DL is constituted by a so-called high-pressure discharge lamp.

[0072] 【0028】

[0073] The DC power supply circuit 1 has: a diode bridge DB, which performs full-wave rectification on the AC input from the AC power supply AC; a booster unit 11, which smoothes and boosts the voltage output from the diode bridge DB; a voltage drop unit 12 , which steps down the voltage output by the booster 11 . The booster 11 is a known booster converter that takes the voltage across the capacitor C1 as the output voltage, and is composed of the following parts: an inductor L1 connected between the DC output terminals of the diode bridge DB, a diode D1 and a series circuit of capacitor C1; swi...

Embodiment approach 2

[0092] Since the basic configuration of the present embodiment is the same as that of Embodiment 1, the same reference numerals are attached to the common parts and descriptions thereof are omitted, and only different parts will be described.

[0093] 【0038】

[0094] In this embodiment, if Figure 5 As shown, the step-down unit 12 is not provided in the DC power supply circuit 1 , and the output voltage of the boost unit 11 becomes the output voltage of the DC power supply circuit 1 .

[0095] 【0039】

[0096] In addition, there are: a capacitor C3 connected in parallel to the series circuit of the pulse transformer PT and the discharge lamp DL; and an inductance L3 connected between the connection points of the discharge lamp DL and the switching elements Q5 and Q6.

[0097] 【0040】

[0098] In this embodiment, if Image 6 As shown, during one cycle (on and off) of the switching elements Q3 to Q6 of the converter circuit 2, the phase of the voltage (lamp voltage) Vla at bot...

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PUM

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Abstract

An electric discharge lamp operating device includes: a DC power supply circuit (1) which outputs DC power, an inverter circuit (2) which converts the DC power outputted by the DC power supply circuit(1) to AC power and supplies it to an electric discharge lamp DL, a control circuit (3) which controls the frequency (operation frequency) of output from the inverter circuit (2), and a start detection circuit (4) which detects starting (start) of electric discharge by the electric discharge lamp DL. The control circuit (3) operates in a start improvement mode for lowering the operation frequencythan that in an operating mode for a predetermined time after detection of the start of the electric discharge lamp DL by the start detection circuit (4) in a no-load mode, and thereafter shifts to the operating mode for keeping operation of the electric discharge lamp DL. This enables smooth shift of the electric discharge lamp DL to stable operation.

Description

technical field [0001] 【0001】 [0002] The present invention relates to a discharge lamp lighting device, a lighting fixture using the discharge lamp lighting device, and a lighting system using the lighting fixture. Background technique [0003] 【0002】 [0004] Conventionally, there has been provided a discharge lamp lighting device having an inverter circuit that converts DC power into AC power and supplies it to the discharge lamp (for example, refer to Patent Document 1). [0005] 【0003】 [0006] As such a discharge lamp lighting device, for example, there is Figure 15 scheme shown in . The discharge lamp lighting device has: a DC power supply circuit 1, which converts the voltage of the DC power supply E; a converter circuit 2, which converts the DC power output by the DC power supply circuit 1 into AC power, and supplies it to the discharge lamp DL; a control circuit 3 , which controls the output frequency of the converter circuit 2 . The discharge lamp DL is the...

Claims

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Application Information

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IPC IPC(8): H05B41/24
CPCH05B41/382H05B41/2887
Inventor 长田晓熊谷润小松直树
Owner PANASONIC CORP
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