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Discharge lamp lighting device and illuminating apparatus using the same

A technology for lighting devices and discharge lamps, which is applied in the field of poor connection and filament disconnection detection, and end-of-life detection of discharge lamps. It can solve problems such as inverter circuit oscillation and achieve low-cost devices and good safety effects.

Inactive Publication Date: 2014-05-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the filament terminal A is disconnected, the voltage across the capacitor C6 rises transiently when the power is turned on, so there is a possibility that the no-load detection circuit detects falsely at startup and the inverter circuit starts to oscillate.

Method used

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  • Discharge lamp lighting device and illuminating apparatus using the same
  • Discharge lamp lighting device and illuminating apparatus using the same
  • Discharge lamp lighting device and illuminating apparatus using the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0076] Such as figure 1 As shown, the lighting fixture 1 employing the discharge lamp lighting device 10 according to the first embodiment of the present invention includes: a fixture main body 2, a reflector 3 attached to the fixture main body 2 to cover the bottom of the fixture main body 2, and a longitudinal direction A hot cathode type straight tube discharge lamp FL arranged on the lower surface of the reflector 3 and a pair of sockets 4 arranged at both ends of the reflector 3. In each socket 4, two pairs of pin contact holes 5 are provided via a spring not shown. By installing the discharge lamp FL in the pin contact hole 5, the filament terminal (refer to figure 2 ) A, B and the filament terminal on the other end of the discharge lamp FL (refer to figure 2 ) C and D are electrically connected to the discharge lamp lighting circuit 10. In addition, the discharge lamp FL may be replaced with one shown in the figure, but may be plural. In this case, the number of socke...

no. 2 approach

[0103] Next, a discharge lamp lighting device and a lighting fixture using the discharge lamp lighting device according to a second embodiment of the present invention will be described. In addition, in each of the following embodiments, the same reference numerals or corresponding reference numerals are assigned to the same reference numerals or corresponding reference numerals in the figures for the structural units that are the same as those of the above-mentioned first embodiment or the functionally equivalent structural units, thereby simplifying or omitting the description. .

[0104] Such as Figure 7 As shown, in the discharge lamp lighting device 20 according to the second embodiment of the present invention, the control circuit section 13 includes a third voltage comparator NL for detecting the presence or absence of a load. The third voltage comparator NL is applied with The connection of the filament terminal A or the filament terminal B of the discharge lamp FL and t...

no. 3 approach

[0127] Next, the discharge lamp lighting device and the lighting fixture using the discharge lamp lighting device according to the third embodiment of the present invention will be described.

[0128] Such as Picture 12 As shown, in the discharge lamp lighting device 30 of the third embodiment of the present invention, the resistor R3 is connected to the filament terminal A, and the resistor R1 is connected to the filament terminal B. Each operation of the discharge lamp lighting device 30 is the same as that of the second embodiment, so the description is omitted.

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Abstract

Provided are a discharge lamp lighting device and an illuminating apparatus using the same, wherein the separation of one end of the filament terminal is detected by a few circuit parts when the lamp is started, the lamp at the later of its life is detected, the discharge lamp lighting device is safe, cheap, and the device is minimized. The discharge lamp lighting device and the illuminating apparatus using the same possess the following: an inverter circuit, which includes a switch, wherein a DC voltage is transformed to a high frequency voltage; a resonant circuit; an inverter control circuit; a resistor voltage dividing circuit; a bypass capacitor for AC bypassing; a DC current source, wherein DC is input to the bypass capacitor with a bias voltage; a first abnormity load detection circuit, wherein when the detected voltage of two ends of the bypass capacitor exceeds a first standard voltage, the high-frequency power supply to the discharge lamp is decreased or stopped; and a second abnormity load detection circuit, wherein when the detected voltage of two ends of the bypass capacitor exceeds a second standard voltage, the high-frequency power supply to the discharge lamp is decreased or stopped.

Description

Technical field [0001] The present invention relates to a discharge lamp lighting device for high-frequency lighting of a discharge lamp having a filament, and a lighting fixture using the discharge lamp lighting device, and particularly relates to detection of poor connection of a load and disconnection of the filament, and detection of the end of life of the discharge lamp. Background technique [0002] In the past, such as Figure 35 As shown, there are known a discharge lamp lighting device 100 and a lighting fixture 500 using the discharge lamp lighting device 100 (for example, refer to Patent Document 1), which uses a bypass capacitor C15 to detect only the direct current of the discharge lamp FL Voltage to detect the end of life of the discharge lamp FL. [0003] In the discharge lamp lighting device 100 and the lighting equipment 500 using the discharge lamp lighting device 100, the input terminal of a full-wave rectifier circuit 101 such as a diode bridge is connected to a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/285
CPCY02B20/00
Inventor 大谷秀雄光安启滨本胜信藤本幸司
Owner PANASONIC CORP