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Segmented dimming control circuit for electronic ballast of fluorescent lamp

An electronic ballast and segmented dimming technology, applied in the direction of light source, electric light source, electrical components, etc., can solve problems such as visual impact of human eyes, and achieve the effect of reducing visual impact and making the circuit simple and easy to operate.

Inactive Publication Date: 2012-07-25
SHANGHAI ARCATA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] In the existing two-stage dimming mode, the changes of the two brightness states of bright and dark are direct switching without intermediate brightness or transition of brightness gradient, which will cause visual impact on human eyes when switching brightness

Method used

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  • Segmented dimming control circuit for electronic ballast of fluorescent lamp
  • Segmented dimming control circuit for electronic ballast of fluorescent lamp
  • Segmented dimming control circuit for electronic ballast of fluorescent lamp

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Embodiment Construction

[0035] Please refer to the accompanying drawings for a further description of the present invention.

[0036] The present invention proposes a segmented dimming control circuit for electronic ballasts of fluorescent lamps. When switching between bright and dark brightness levels, there is a time-settable transition segment brightness level. The transition segment brightness The level is fixed or gradually changed, which is controlled by a dimming control switch, a delay circuit and a dimming signal forming circuit.

[0037] Such as figure 2 As shown, when switching levels between bright and dark, when switching from bright to dark and from dark to bright, the brightness levels are all gradual.

[0038] Such as image 3 As shown, when switching levels between bright and dark, when switching from bright to dark and from dark to bright, the brightness levels are all fixed.

[0039] Such as Figure 4 As shown, when switching levels between bright and dark, when switching from...

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Abstract

The invention discloses a segmented dimming control circuit for an electronic ballast of a fluorescent lamp. A time-settable transition segment brightness level is used for switching between bright and dark brightness levels, wherein the transition segment brightness level is constant or gradually changing, which is realized by a circuit control formed by a light adjusting control switch, a time delay circuit and the light adjusting signal. The segmented dimming control circuit for the electronic ballast for the fluorescent lamp has the following advantages that the segmented dimming mode using a transition segment with a constant or gradually changing brightness for switching between a high brightness and a low brightness can weaken the visual impact of the brightness switching operation on eyes of a user, and the circuit is simple and practical.

Description

technical field [0001] The invention relates to a dimming control circuit of an electronic ballast for a fluorescent lamp used for lighting, in particular to a dimming control circuit for a segmental dimming electronic ballast for a fluorescent lamp. Background technique [0002] In order to meet the different application requirements of fluorescent lamp lighting, various dimming forms that can control the brightness change of fluorescent lamps have emerged as the times require. Different from the brightness control of the incandescent lamp by changing the effective voltage applied to the lamp, the brightness control of the fluorescent lamp is achieved by changing the operating frequency of the electronic ballast driving the fluorescent lamp and thus changing the current flowing through the fluorescent lamp. [0003] The core of the fluorescent lamp dimming ballast can be attributed to generating a low-level DC control signal to control the frequency of the ballast inverter....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/38
CPCH05B41/38H05B41/3921
Inventor 张华杨建文毛松领
Owner SHANGHAI ARCATA ELECTRONICS
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