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Power-supply device for discharge lamp

A technology for a power supply device and a discharge lamp is applied in the use of gas discharge lamps, lighting devices, electric light sources, etc., and can solve problems such as shortening lamp life.

Inactive Publication Date: 2003-12-17
USHIO DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to solve the problems existing in the background technology, that is, the problem that the life of the lamp is shortened when the arc discharge of the high-intensity discharge lamp is switched.

Method used

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  • Power-supply device for discharge lamp
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  • Power-supply device for discharge lamp

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Embodiment Construction

[0055] First, a first embodiment of the invention according to claim 1 of the present invention will be described. Figure 5 It shows a simplified structure of the power supply control circuit Fx. The above-mentioned lamp voltage signal Sv is input to the AD converter Adc in the integrated control unit Xpu, converted into digital lamp voltage data Sxv having an appropriate number of digits, and input to the microprocessor device Mpu.

[0056] Here, the microprocessor device Mpu includes a cpu, a program memory, a data memory, a clock pulse generating circuit, a time counter, an IO controller for inputting and inputting data signals, and the like.

[0057] The microprocessor unit Mpu generates clipping capability control target data Sxt for the clipping capability control circuit Ud described below based on the calculation referring to the above-mentioned lamp voltage data Sxv and condition judgment corresponding to the system state at that time. The aforementioned clipping ca...

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Abstract

The invention discloses a power supply device of a light source device with a high-intensity discharge lamp, which can solve the problem of shortened lamp life during arc discharge conversion. In order to solve this problem, the above-mentioned power supply device controls so that the current flowing into the above-mentioned discharge lamp does not exceed a prescribed current limit value, and its function is: before the above-mentioned discharge lamp is switched to arc discharge; the above-mentioned current limit value is the first limit value , and then change the above-mentioned current limit value to the second limit value, the structure is: the above-mentioned first limit value is less than 70% of the above-mentioned second limit value, and the above-mentioned discharge lamp is switched to arc discharge after 0.2ms (milliseconds) or more During the period, the above-mentioned current limit value is kept at the first limit value.

Description

technical field [0001] The present invention relates to a discharge lamp power supply device for lighting high-intensity discharge lamps (HID lamps) such as high-pressure mercury discharge lamps and metal halide lamps, which are used as light sources for optical devices such as projectors, for example. Background technique [0002] In light source devices for optical devices such as liquid crystal projectors and DLP(TM) (Texas Instruments) projectors, a high-intensity discharge lamp and a power supply device for lighting are used in combination. [0003] There are two types of drive for the discharge lamp: one is the electrode polarity of the two poles of the discharge lamp, that is, one is the cathode and the other is the anode, and the relationship is constant; the other is the cathode and the anode. An AC drive whose relationship alternates substantially periodically. And, in AC driving, the speed of this polarity change, that is, the driving frequency may be driven at a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/24H05B41/282H05B41/292H05B41/38
CPCY02B20/208H05B41/2928H05B41/388Y02B20/00
Inventor 冈本昌士福田稔竹清敦
Owner USHIO DENKI KK
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