electronic ballast for metal halide lampsmauritania pronunciation sound

Metal Halide lamps are used in sporting stadiums and industrial applications where light quality is important. United States and many other countries a filter and rectification circuit connected to an input voltage source terminal for suppressing electromagnetic disturbances and rectifying an input voltage signal; a step-up converter disposed after said filter and rectification circuit, said step-up converter further comprising a push-pull transistor, a step-up inductor and a rectification diode and a filter capacitor; a step-down converter disposed after said step-up converter, said step-down converter further comprising an inductor, a diode, a capacitor and a transistor switch, said step-down converter controlling the current in said inductor at the boundary of continuity and discontinuity so as to lessen power loss and enhance operation efficiency; a DC-AC converter disposed after said step-down converter for providing an alternating square-wave voltage to a metal halide lamp; an ignition circuit using circuit elements including a step-up transformer and a capacitor to generate an electric voltage up to 3 kilo volts for discharging said metal halide lamp; and a micro processor for controlling the conducting rate of said step-down converter according to the product of output voltage and current of said step-down converter, whereby power regulation can be achieved; whereby said three-stage electronic ballast for metal halide lamps can force said inductor in said step-down converter to operate in a continuous boundary current mode, whereby the peak value of said inductor current will be decreased, and whereby said transistor switch switches under zero current, significantly reducing power loss in switching. China Electronic Ballast For Metal Halide Lamp manufacturers - Select 2020 high quality Electronic Ballast For Metal Halide Lamp products in best price from certified Chinese Halide Lamp manufacturers, LED Lamp suppliers, wholesalers and factory on Made-in-China.com

ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FORCircuit arrangements or apparatus for igniting or operating discharge lampsCircuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. The device comprises a filter and rectification circuit connected to an input voltage source terminal for suppressing electromagnetic disturbances and rectifying an input voltage signal; a step-up converter disposed after the filter and rectification circuit, the step-up converter further comprising a push-pull transistor, a step-up inductor and a rectification diode and a filter capacitor; a step-down converter disposed after the step-up converter, the step-down converter further comprising an inductor, a diode, a capacitor and a transistor switch, the step-down converter controlling the current in the inductor at the boundary of continuity and discontinuity so as to lessen power loss and enhance operation efficiency; a DC-AC converter disposed after the step-down converter for providing an alternating square-wave voltage to a metal halide lamp; an ignition circuit using circuit elements including a step-up transformer and a capacitor to generate an electric voltage up to 3 kilo volts for discharging the metal halide lamp; and a micro processor for controlling the conducting rate of the step-down converter according to the product of output voltage and current of the step-down converter, whereby power regulation can be achieved; The three-stage electronic ballast for metal halide lamps can force the inductor in the step-down converter to operate in a continuous boundary current mode, whereby the peak value of the inductor current will be decreased, and whereby the transistor switch switches under zero current, significantly reducing power loss in switching.The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawings.Further, the electronic ballasts for metal halide lamps of the prior art use a power-factor correction circuit comprising a step-up converter for jumping input voltage and correcting the power factor at the same time.

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