Device and method for light-modulating control of fluorescent lamp

A technology of dimming control and fluorescent lamps, which is applied in many fields with advantages of low electromagnetic interference and low switching stress, and can solve the problems of high cost, increased switching loss of inverters, complex frequency conversion control, etc., and achieves reduced manufacturing costs and small voltage ratings , The effect of small switching loss
CN1436029AInactive Publication Date: 2003-08-13CITY UNIVERSITY OF HONG KONG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CITY UNIVERSITY OF HONG KONG
Publication Date
2003-08-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

A circuit structure and control method for controlling the light modulation of fluorescent lamp is disclosed. Said fluorescent lamp is driven by a semi-bridge resonant inverter type ballast working in constant frequency and constant duty ratio. Changing the DC input voltage of said ballast can modulate the light. Its variable DC power supply is taken from AC-DC converter for AC input power supply or DC-DC converter for DC input power supply.
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Description

technical field

[0001] The invention relates to the related problems of the dimming control method and equipment of the electronic ballast for fluorescent lamps, and particularly relates to the advantages of low electromagnetic interference and low switch stress brought by the equipment and the control method. Background technique

[0002] As an energy-saving measure for residential, commercial and industrial lighting, high-frequency electronic ballasts for fluorescent lamps are gradually being widely used. Electronic ballasts have many advantages such as: increased efficiency, higher output luminosity and longer life of fluorescent lamps. Electronic ballasts are switch-mode power circuits, generally using series resonant power converters.

[0003] figure 1 The basic principle of the traditional electronic ballast is drawn. At a higher frequency (usually 25kHz ~ 50kHz), the resonant capacitor C r The voltage on will turn the lamp on. Due to the high frequency of the driv...

Claims

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