High pressure gas discharge lamp 750khz driving method and circuit

Abstract

Disclosed are a method and circuit for 75o KHz high voltage gas discharge lamp driving. The circuit comprises a high voltage rectification filter unit and a direct-current voltage reduction and stabilization unit, and the output of the voltage reduction and stabilization unit is connected with a control chip in an intelligent oscillation control unit; square signals output by two pins of the control chip are set to be 750 KHz; meanwhile, the falling edge of the square signal output by the first pin is made to be earlier than the rising edge of the square signal output by the second pin by a certain time, and the rising edge of the square signal output by the first pin is made to be later than the rising edge of the square signal output by the second pin by a certain time. The method and circuit have the advantages that according to the scheme, the method and system can be away from an acoustic resonance window area, second-order conversion is adopted, electric energy losses are small, electric energy conversion efficiency is improved, stroboflash does not exist, and optical efficiency is high. The selected control chip is low in price and strong in function, the drive frequency and the half-bridge oscillatory power unit dead time of the high voltage gas discharge lamp can be controlled, the process is simple and convenient to implement, the rate of finished products is high, and batch production is facilitated.

Description

technical field [0001] The invention relates to a method and circuit technology for driving a high-pressure gas discharge lamp, in particular to a method and a circuit for driving a high-pressure gas discharge lamp at 750KHz. Background technique [0002] At present, most of the driving methods and circuits of high-pressure gas discharge lamps at home and abroad adopt low-frequency square wave third-order constant power excitation circuit, the purpose is to eliminate "acoustic resonance", although the low-frequency square wave third-order constant power excitation circuit scheme can be compared Solve the above-mentioned problem well, but its complicated circuit, low efficiency, and poor reliability, stroboscopic problem also has not solved yet. [0003] At present, the circuit used by the applicant is a self-excited circuit, and has applied for a Chinese invention patent, application number 201110108978.6, title: a HID electronic ballast circuit electronic ballast and high-p...

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Problems solved by technology

[0004] Although its circuit is simple, high in efficiency, low in cost, and has many innovations, it still needs to be improved, that is, the temperature characteristics of the excitation magnetic ring used in the above technology are poor, and under the strong current impulse, the inductance The quantity will change greatly, the frequency is greatly affected by temperature, and it is difficult to debug, which often leads to circuit detuning, which will affect the start and cause ignition failure

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