Soft Switch Mode Low Frequency Square Wave Xenon Lamp Electronic Ballast

Abstract

The invention discloses an HID (High Intensity Discharge) xenon lamp electronic ballast with a soft switching mode and low-frequency square wave driving. The HID xenon lamp electronic ballast is characterized in that the purpose of constant-power output of an xenon lamp load is realized by combination of a BOOST circuit and a half-bridge soft switching inverter circuit, and matching control with a modulation method corresponding to the system and current feedback control. An independent control chip is adopted in the process of power factor correction, so that the system interference is reduced. The HID xenon lamp electronic ballast disclosed by the invention has the advantages that the switching-on time and the switching-off time of an MOS (Metal Oxide Semiconductor) tube are determined by selecting the voltage and the current of the MOS tube and adopting logic operation of a control circuit so as to realize zero-voltage switching on and zero-voltage switching off of the MOS tube and reduce the switching loss; and the abnormal states of short circuit, open circuit and aging and the like of an xenon lamp are detected and protected by acquiring the voltage and the current of the two output ends in real time.

Description

technical field [0001] The invention relates to an electronic ballast for a low-frequency square-wave xenon lamp in soft switching mode, which belongs to the technical field of lighting electronics. Background technique [0002] Xenon metal halide lamp is a major improvement and innovation on the basis of metal halide lamp. The inert gas "xenon" is added, and the inner bubble formula is improved, so that the brightness and life of the bulb are increased by more than 2 times, and the lumens per watt reach 120. Compared with metal halide lamps and high-pressure sodium lamps, it can save more than 40% energy. It is the only energy-saving lighting product in the field of high-power lighting. Features and special start-up requirements, must be used together with matching ballasts, electronic ballasts have many advantages compared with traditional inductive ballasts, electronic ballasts have high efficiency, and their own energy consumption is only a few Watts are energy-saving ...

AI Technical Summary

Problems solved by technology

[0004] Traditional low-frequency square-wave electronic ballasts generally adopt a three-stage structure, namely BOOST step-up power factor correction circuit, BUCK step-down circuit and DC-DC full-bridge or half-bridge inverter circuit. This kind of circuit structure is complicated and the production cost is expensive. In this three-level structure, the BUCK step-down circuit is responsible for the power regulation and control function of the discharge lamp. Generally, it is a hard switch control method. The switching loss of the switching device is very large, which makes it difficult to improve the efficiency of the ballast itself. In order to simplify the circuit and reduce cost and improve the efficiency of switching devices. An electronic ballast is disclosed in the prior art, which cancels the BUCK step-down circuit link, realizes the AC square wave output through the half-bridge inverter circuit, and detects the working voltage and current state of the circuit at the same time. Make the switching device in a soft switching state, greatly reducing its switching loss

Images