Driving circuit and driving method thereof and electronic ballast

Abstract

The invention provides a driving circuit and a driving method thereof and an electronic ballast. The driving circuit comprises an input circuit, a rectification circuit coupled to the input circuit, apower factor correction circuit coupled to the rectification circuit, an inversion circuit coupled to the power factor correction circuit, a light-emitting element coupled to the inversion circuit, and a control chip coupled to the input circuit, the power factor correction circuit and the inversion circuit. The input circuit is used for inputting AC voltage; the rectification circuit is used forreceiving an alternating-current voltage and outputting a first direct-current voltage; the power factor correction circuit is used for receiving the first direct-current voltage and outputting a second direct-current voltage; the control chip is used for receiving a voltage signal obtained after processing the alternating-current voltage and the second direct-current voltage to output a first control signal to the power factor correction circuit and output a second control signal to the inverter circuit; and the inverter circuit is used for receiving the second direct-current voltage and converting the second direct-current voltage into the alternating-current voltage to control the light-emitting element. Conversion stage number of electric energy is reduced, and electric energy utilization rate is improved.

Description

technical field [0001] The present application relates to the technical field of electronic ballasts, in particular to a driving circuit, a driving method thereof, and an electronic ballast. Background technique [0002] In the commonly used HID (High intensity Discharge, electronic ballast), the relatively common input voltage range is generally single-phase AC 90Vac ~ 265Vac. Under this input voltage condition, the more mature circuit scheme of HID is generally: the AC The voltage is converted into a stable DC power through a step-up power factor correction circuit, and then converted into a suitable AC voltage and current through an inverter circuit to drive the HID lamp. Such a circuit scheme is simple, practical and cost-effective. [0003] However, when the application of electronic ballasts needs to be compatible with North American industrial electricity, the input grid types include 240V / 277V / 347V / 400V / 480V. Considering the voltage fluctuation of the grid, the inpu...

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Problems solved by technology

However, this will also increase the voltage stress of the rear-stage inverter circuit, which increases the difficulty of circuit design. The voltage stress of the corresponding switch tube also needs to be selected to a higher value, which also increases the cost.

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