Synchronous operation set

Abstract

A synchronous operation device consists of light tube, natural vibration converting circuit, sampling and frequency generating circuit, detection and feedback circuit, adjusting circuit and voltage dropping circuit. It is featured as sampling natural vibration frequency by preset sampling point in natural vibration converting circuit or by preset sampling point of said converting circuit and voltage dropping circuit to make control signal outputted from adjusting circuit synchronize to natural vibration frequency for improving ripple phenomenon of high voltage output.

Description

technical field [0001] The present invention relates to a synchronous operation device, in particular to a synchronous operation device for synchronizing self-oscillation with frequency of converter and step-down circuit. Background technique [0002] The use of Liquid Crystal Display (LCD) is becoming more and more frequent, and has gradually replaced traditional CRT monitors. It has the inherent advantages of not occupying space, low energy consumption and low radiation, making it a popular choice for modern homes and public places. Set the primary display system. At present, the most commonly used fluorescent lamp (Fluorescent Lamp, FL for short) drive circuit mostly uses the Royer circuit conversion structure invented by Dr. Royer. Its main structure is a DC-to-DC step-down converter (Buck Converter) and an automatic Vibration DC-to-AC device. The DC-to-DC step-down converter (Buck Converter) in the front stage is used as a simple voltage conversion. By controlling the...

AI Technical Summary

Problems solved by technology

Wherein, because the step-down circuit 512 and the DC / AC conversion circuit 502 are out of synchronization in frequency, it will cause problems on the difference frequency and lead to voltage ripples output on the fluorescent tube 504

[0008] To sum up the above, due to the voltage ripple phenomenon generated by the asynchronous frequency of the DC / AC conversion circuit 502 and the step-down circuit 512, this high voltage ripple phenomenon sometimes causes the flickering phenomenon of the fluorescent lamp 504 and the lamp The instability of the tube current feedback control causes design instability

[0009] This shows that the above-mentioned existing synchronous operation device obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.

In order to solve the above-mentioned problems of synchronous operation devices, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable structure for general products to solve the above-mentioned problems. Obviously, it is a problem that relevant industry players are eager to solve.

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