Single-phase single-stage high-intensity discharge (HID) high-frequency electronic ballast based on bidirectional BUCK power factor correction and LC high-frequency resonant soft-switching technique

Abstract

The invention discloses a single-phase single-stage high-intensity discharge (HID) high-frequency electronic ballast based on bidirectional BUCK power factor correction and an LC high-frequency resonant soft-switching technique. The single-phase single-stage HID high-frequency electronic ballast comprises a power main circuit and a control circuit, wherein the power main circuit is a bidirectional BUCK circuit topology and comprises an LC filtering circuit, a bidirectional switch circuit and an LC resonant circuit, the LC filtering circuit is arranged at an input end and connected with an input power supply, the LC resonant circuit is arranged at an output end and connected with an external HID lamp, and the control circuit comprises an auxiliary power supply, a synchronous circuit, a sampling circuit, a conditioning circuit, a singlechip, a pulse frequency modulation (PFM) generation circuit, a logic circuit and a driving circuit. In the single-phase single-stage HID high-frequency electronic ballast, a control method of constant-frequency quasi-resonant starting and frequency-modulation quasi-resonant starting is adopted, the input power frequency AC current can be directly converted into high-frequency AC current only by using a one-stage power conversion circuit, and an applicable high-frequency AC power supply is provided for lighting of the HID lamp.

Description

【Technical field】 [0001] The invention relates to lighting fields such as HID lamps, in particular to a single-phase single-stage HID high-frequency electronic ballast based on two-way BUCK power factor correction and LC high-frequency resonance soft switching technology. 【Background technique】 [0002] HID lamps have been widely popularized and applied in the field of lighting due to their advantages such as good color rendering, high brightness, good energy-saving effect, and good light transmission. However, in order to ensure reliable operation of HID lamps, special electronic ballasts are required. However, until now, the electronic ballasts with mature technology on the market are mainly in the form of two-stage structure and three-stage structure circuit. First, the input AC power is converted into DC power, and then the DC power is converted into AC output. The pre-stage circuit is a power factor correction circuit, which converts the input alternating current into d...

AI Technical Summary

Problems solved by technology

The power switching tube of the ballast works in hard switching, the switching loss is large, the power factor is low, and the harmonic wave is large. The output is a low-frequency intermittent square wave or a high-frequency intermittent sine wave. Ignition will also bring electromagnetic compatibility problems, and the effective value of the chopper output voltage is low, which can be used for low-power and low-voltage HPS, but cannot be applied to high-power and high-voltage HPS, and an ignition device needs to be added

[0004] In order to solve the above-mentioned problems existing in the existing electronic ballasts, the inventor has proposed the invention patent application of "Single-phase single-stage HID high-frequency electronic ballast based on bidirectional BUCK power factor correction and LCC high-frequency resonance soft switching technology", Due to the frequency-modulated resonance mode, the effective value of the output voltage is low, which limits its application in high-voltage HID and other HPS

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