Drive circuit with power factor correction used for LED street lamp

Abstract

The invention discloses a drive circuit with power factor correction used for an LED street lamp. The drive circuit is characterized by comprising an AC power supply, a full-bridge rectification circuit, a primary control circuit, an energy transmission circuit and a secondary output rectification circuit; the full-bridge rectification circuit comprises first to fourth diodes; the primary controlcircuit comprises a fifth diode, a sixth diode, a second inductor, a third capacitor and a power switch tube; the energy transmission circuit comprises a third inductor and a transformer; and the secondary output rectification circuit comprises a seventh diode. The drive circuit has a power factor correction function, multiple peripheral devices are omitted, the structure is simple, and the manufacture cost is low; advantages including energy saving of the LED lamp, high illumination efficiency, low maintenance cost and free of chemical pollution are utilized fully; and current harmonic wavesof the drive circuit can satisfy IEC standards, and the drive circuit has wide market prospects.

Description

technical field [0001] The invention relates to the field of LED driving, in particular to a driving circuit with power factor correction for LED street lamps. Background technique [0002] At night, street lights can provide sufficient illumination to help drivers and pedestrians accurately determine their position and the route ahead. Traditional high-intensity gas discharge circuit lamps are mainly high-pressure mercury lamps, which have the advantage of low cost, but their disadvantages are low efficiency and chemical pollution. [0003] Due to its energy saving, high lighting efficiency, low maintenance cost and no chemical pollution, LED has huge advantages in power consumption and lighting efficiency compared with traditional light sources, and has become the most attractive light source for indoor and outdoor lighting. [0004] There are two main types of existing LED street lamp drive circuits: two-stage drive and single-stage drive. The two-stage drive circuit is...

AI Technical Summary

Problems solved by technology

The single-stage drive circuit is mainly composed of a double-boost-boost circuit and a half-bridge LCC DC-DC resonant converter. Although the single-stage drive is realized, two power switch tubes and more peripheral devices are still required.

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