Method for adjusting brightness of fluorescent lamp

Abstract

The invention relates to a method for adjusting the brightness of a fluorescent lamp, which is used for adjusting the brightness of the fluorescent lamp based on a common electronic ballast or an integrative fluorescent lamp circuit, wherein the integrative fluorescent lamp circuit comprises a single-chip and a digital-analog conversion circuit which are connected with an input end of a high-frequency inverter circuit in turn; an input end of the single-chip is connected with an APFC circuit with fixed working frequency to perform recognition counting on working current pulses; the number Ym of the working current pulses in a fully conducting state corresponds to a state with the maximum brightness and corresponds to a brightness adjustment control voltage signal Xm; the relation between the counted number Y of the working current pulses and a brightness adjustment control voltage signal X in a one-way pulsating voltage cycle is adjusted to be a linear or logarithmic relation; and a brightness adjustment control voltage signal X1 generated accordingly is sent to the high-frequency inverter circuit to perform brightness adjustment. The method realizes the total range smooth brightness adjustment of the fluorescent lamp, can also ensure the normal lightening of the fluorescent lamp when tangent brightness adjustment is at low voltage, solves the problem of a high start-up point of the fluorescent lamp, can adjust the brightness of the fluorescent lamp by using any existing common front-back edge tangent brightness adjusters, and has full compatibility.

Description

technical field [0001] The invention relates to an electronic ballast for a fluorescent lamp or a dimming method for an integrated fluorescent lamp. Background technique [0002] Fluorescent lamps are one of the most commonly used lighting sources. As people's requirements for energy saving and lighting effects continue to increase, a method for adjusting the brightness of fluorescent lamps has emerged to achieve different lighting effects according to different lighting requirements such as lighting brightness and lighting atmosphere. [0003] Such as figure 1 As shown, the existing low-power ordinary electronic ballast or integrated fluorescent lamp circuit below 25 watts adopts sequentially connected EMI circuit 1 (Electro Magnetic Interference electromagnetic interference filter circuit), rectifier circuit 2, DC filter circuit 4 and adjustable The high-frequency inverter circuit 5 is used to drive the fluorescent lamp 6 by the high-frequency inverter circuit 5 . [00...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a fluorescent lamp dimming method, which overcomes the flickering and unstable light emission of the fluorescent lamp circuit in the prior art when the fluorescent lamp is dimmed, and the phase shift and resonance of the fluorescent lamp circuit due to the phase-cutting voltage peak, which is harmful to the subsequent circuit. The work stability is affected, the starting point of the ballast circuit is high, resulting in a narrow dimming range, the fluorescent lamp cannot be adjusted at low brightness, and the brightness adjustment of the fluorescent lamp is non-linear, which causes the dimmer to feel that the brightness of the fluorescent lamp does not change in the latter stage of adjustment. obvious defects

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