Self-adaptive power matching circuit of fluorescent lamp and method

Abstract

The invention relates to a self-adaptive power matching circuit of a fluorescent lamp, which comprises a micro control unit (MCU), a driving circuit and a fluorescent lamp tube, and also comprises a detection circuit connected with the fluorescent lamp tube for acquiring a current or voltage signal of the fluorescent lamp tube. The MCU comprises a feedback detection module, a power matching module and a frequency modulation control module; the feedback detection module receives the current or voltage signal output by the detection circuit, and converts an analog signal into a digital signal; the power matching module receives the signal and performs power matching processing, and detects the starting frequency of the fluorescent lamp tube; and the frequency modulation control module outputs pulse width modulation wave corresponding to the installed fluorescent lamp tube according to the starting frequency, and enables the fluorescent lamp tube to emit light normally through the driving circuit. The invention also relates to a self-adaptive power matching method for the fluorescent lamp. Through the circuit and the method, the ballast can adapt to a plurality of lamp tubes with different power, and the waste and high use-cost caused by replacing the ballast due to replacing the fluorescent lamp tube are avoided.

Description

technical field [0001] The invention relates to a ballast circuit and method applied to fluorescent lamps, more specifically, to an adaptive power matching circuit and method for fluorescent lamps. Background technique [0002] Current ballast circuits for fluorescent lamps such as figure 1 As shown, it includes a dimming chip 10 , a driving circuit 20 , and a fluorescent tube 30 . The dimming chip 10 outputs a fixed pulse width modulation wave to the drive circuit 20, and the drive circuit 20 inverts the DC voltage into a high-frequency AC voltage output required by the fluorescent tube 30 to drive the fluorescent tube 30 to realize lighting. Therefore, a ballast can only output a pulse width modulated wave with a fixed frequency to light a fluorescent tube of corresponding power. If the lamp tube with different power is replaced, the starting frequency of the fluorescent tube will change, and the ordinary ballast circuit cannot automatically identify it, so it cannot out...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the defects of the existing fluorescent lamp circuit that different ballasts need to be matched due to different lamp powers, and provides a fluorescent lamp self-adaptive power matching circuit and method

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