Alternating current voltage regulating device for projection lamp

A technology for AC voltage regulation and projection lamps, which is applied to lighting devices, lamp circuit layout, light sources, etc. It can solve the problems of burning out projection lamps and flickering lights, and achieve the effect of protecting against burnout and stabilizing the brightness of bulbs

Inactive Publication Date: 2014-03-26
CHENGDU MOYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, various projector projection lamps have been popularized. As we all know, the brightness of projection lamps must meet very high requirements to make the picture clearer. However, in the case of unstable voltage, the current projection lamps are likely to cause lights to flicker. Even burn out the projector lamp

Method used

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  • Alternating current voltage regulating device for projection lamp

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with accompanying drawing:

[0010] As shown in the drawings: the present invention includes a rectifier circuit UR, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first transistor VT1, a second transistor VT2, and a phototransistor VT3, unijunction transistor VT4, thyristor VT5, capacitor C and potentiometer R6, one end of the input end of the rectifier circuit UR is connected in series with the lamp bulb L of the projection lamp, and then connected to one end of the AC power supply U, and the other end of the input end of the rectification circuit UR is connected to The other end of the AC power supply U is connected, and the negative output terminal of the rectifier circuit UR is simultaneously connected with the first terminal of the first resistor R1, the first terminal of the fifth resistor R5 and the positive pole of the thyristor VT5,...

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Abstract

The invention discloses an alternating current voltage regulating device for a projection lamp. The alternating current voltage regulating device comprises a rectifying circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor, a phototriode, a unijunction transistor, a thyristor, a capacitor and a potentiometer. A transistor automatic alternating current voltage regulating circuit is adopted, so the first transistor, the second transistor and the phototriode play the function of equivalent resistors, when light rays of the projection lamp change along with the change of the power supply voltage, the resistance of the phototriode changes, the voltage phase controlling the unijunction transistor is changed, so that the pulse phases of the transistors move, the breakover time of the transistors is increased or decreased, and the voltage of a bulb of the projection lamp is enabled to approximately remain unchanged. The alternating current voltage regulating device adopts the transistor automatic alternating current voltage regulating circuit, enables the brightness of the bulb of the projection lamp to be relatively stable, can enable the brightness of the bulb to be stable under the condition that the voltage is instable, and further protects the bulb from being burnt.

Description

technical field [0001] The invention relates to an additional device for a projection lamp, in particular to an AC voltage regulating device for a projection lamp. Background technique [0002] At present, various projector projection lamps have been popularized. As we all know, the brightness of projection lamps must meet very high requirements to make the picture clearer. However, in the case of unstable voltage, the current projection lamps are likely to cause lights to flicker. Even burn out the projection lamp. Contents of the invention [0003] The object of the present invention is to provide an AC voltage regulating device for projection lamps in order to solve the above problems. [0004] The present invention achieves the above object through the following technical solutions: [0005] The invention includes a rectifier circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor, ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCY02B20/42Y02B20/40
Inventor 张君
Owner CHENGDU MOYI TECH
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