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Metal halide lamp electronic ballast protection circuit

An electronic ballast and protection circuit technology, applied in the direction of electric light sources, electrical components, climate sustainability, etc., can solve the problems of high cost of single-chip microcomputer, insufficient reliability, low cost of thyristor protection, etc., and achieve low cost and reliability high effect

Active Publication Date: 2019-04-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the protection method of the single chip microcomputer is reliable but the cost is high, while the protection cost of the thyristor is low and the reliability is insufficient

Method used

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  • Metal halide lamp electronic ballast protection circuit
  • Metal halide lamp electronic ballast protection circuit
  • Metal halide lamp electronic ballast protection circuit

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Embodiment Construction

[0031] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.

[0033] It should be understood that although the terms first, second, third etc. may be used herein to describe various elements, components and / or sections, these elements, components and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component and / or section from another. Thus, a first element, component and / or section discussed below could be termed a second element, component or section without departing from ...

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PUM

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Abstract

The invention discloses an electronic ballast protection circuit for a metal halogen lamp. Normal and abnormal differences can be obviously distinguished through sampling signals; furthermore, influence on a driving circuit is low; the protection circuit is simple in structure; resonance starting of a ballast is completed through four comparators; when in a normal state, the circuit can continuously work; and, when in an abnormal state, such as no-load, warm starting and lamp aging, the driving circuit is turned off and latched. The cost is low; the reliability is high; and furthermore, due to simple adjustment, the electronic ballast protection circuit is applied to electronic ballasts having different power.

Description

technical field [0001] The invention relates to a protection circuit, in particular to a protection circuit for a metal halide lamp electronic ballast. Background technique [0002] Due to its small size and high energy efficiency, electronic ballasts occupy an important position in the field of new lighting, but the abnormal protection of ballasts has always been one of the technical difficulties. [0003] When the electronic ballast is in abnormal state such as no-load, hot start of metal halide lamp and aging of lamp tube, excessive high-frequency current will be generated in the passive LC resonant circuit, and large current will flow through the power switch tube, which will generate high temperature. Or a large current breakdown VDMOS (power switch tube), causing damage to the ballast, and even causing a fire and causing heavy property losses. [0004] The existing ballast protection circuit schemes are summarized in two ways: [0005] 1. Sampling through the circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/292
CPCH05B41/2921H05B41/2926Y02B20/00
Inventor 沈克强杨杰黄坤
Owner SOUTHEAST UNIV