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Discharge lamp lighting device

A technology for lighting devices and discharge lamps, applied to the use of gas discharge lamps, lighting devices, electric light sources, etc., can solve problems such as complex structures, increased lamp current or lamp power, and achieve the effect of improving responsiveness

Inactive Publication Date: 2009-06-03
TOSHIBA LIGHTING & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned discharge lamp lighting device has a problem in that it is necessary to provide a lighting detection mechanism for comparing the discharge voltage of the discharge lamp with the threshold voltage to detect the lighting state of the discharge lamp, which complicates the structure.
[0007] In addition, when the discharge voltage of the discharge lamp is compared with the threshold voltage, it may not be possible to detect the moment when the discharge voltage exceeds the threshold voltage. Therefore, there is also a lamp current or a lamp power that increases instantaneously, and the discharge lamp is brightened instantaneously when it is started. lighting problem

Method used

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Embodiment Construction

[0055] Below, refer to Figure 1 to Figure 8 One embodiment of the present invention will be described.

[0056] figure 1 It is a circuit diagram of a discharge lamp lighting device, figure 2 It is a waveform diagram showing the relationship between discharge voltage, discharge current and leakage current of a discharge lamp lighting device, image 3 Indicates the detection method for detecting the peak phase of the discharge voltage in the discharge lamp lighting device, image 3 (a) is a waveform diagram of discharge voltage and discharge current, image 3 (b) is a waveform diagram of sampling the discharge voltage and the discharge current, Figure 4 Indicates the detection method, Figure 4 (a) is a waveform diagram of discharge voltage and discharge current, Figure 4 (b) is a waveform diagram of sampling the discharge voltage and the discharge current, Figure 5 It is a waveform diagram showing the relationship between discharge voltage, detection voltage, and le...

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Abstract

The invention provides a discharge lamp lighting device. The inverter circuit 12 is feedback-controlled by a substantial current flowing into the discharge lamp FL, which is detected by the current detecting means 24. A high starting voltage is supplied to the discharge lamp with the operation frequency lowered by the control circuit 16 after the end of a preheating action. The inverter circuit is controlled so that the current of the discharge lamp becomes a desired current value as soon as the current detecting means detects the current substantially flowing into the discharge lamp. The discharge lamp FL can be prevented from being instantaneously brightly lit without separately providing any structure for detecting lighting of the discharge lamp FL.

Description

technical field [0001] The present invention relates to a discharge lamp lighting device for lighting a discharge lamp. Background technique [0002] Conventionally, in a discharge lamp lighting device, an inverter circuit (inverter) of, for example, a half bridge type is used, and an inductor (inductor) and a capacitor are connected between outputs of the inverter circuit. (Condenser) LC (inductance-capacitance, inductance-capacitance) resonant circuit (resonant circuit), under the resonance of this LC resonant circuit, the discharge lamp is started and lit. [0003] In addition, when the discharge lamp lighting device has the function of dimming the discharge lamp, especially in order to dim the discharge lamp stably when deep dimming is performed, the discharge voltage of the discharge lamp and the inverter The output current of the inverter circuit is detected, and the detected voltage and output current are used for feedback control of the inverter circuit. [0004] W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/392
CPCY02B20/202
Inventor 北村纪之大崎肇岩井直子石北彻鎌田征彦
Owner TOSHIBA LIGHTING & TECH CORP