Ballast with automatic regulation of over-current protection point and lighting fixture thereof

Abstract

The invention relates to a ballast with the automatic regulation of an over-current protection point and a lighting fixture thereof, the ballast comprises a rectifier-filter circuit, a power factor correction (PFC) circuit and an inverter circuit which are sequentially connected, wherein the power factor correction circuit comprises a boost circuit, as well as an over-current protection circuit which is connected with the boost circuit of the PFC circuit and has the function of automatic regulation of the over-current protection point, and the over-current protection circuit comprises an over-current protection point regulation circuit and a switch circuit connected with the over-current protection point regulation point. The lighting fixture comprises the ballast. The ballast and the lighting fixture can carry out the over-current protection, automatically regulate the over-current protection point and more effectively protect the circuits.

Description

technical field [0001] The invention relates to a ballast, more specifically, to a ballast with automatic adjustment of overcurrent protection point and its lighting fixture. Background technique [0002] Nowadays, electronic ballasts are widely used in various lighting and decoration fields, especially ballasts with power factor correction (PFC). The main circuit of the ballast in the traditional PFC system lacks overcurrent protection in the abnormal working state of the PFC chip failure. , Mains fluctuation state, switch state, poor contact of AC input terminal, etc., which lead to the rise of the ground of the chip, and the PFC chip is in a chaotic logic state. At this time, the PFC chip cannot perform over-current protection correctly. Moreover, the ballast of the traditional PFC system will cause a high temperature rise due to the skin effect, which will damage the chip, and the lack of over-current protection of the circuit will cause damage to the chip, so that the ...

AI Technical Summary

Problems solved by technology

The main circuit of the ballast in the traditional PFC system lacks overcurrent protection in the abnormal working state of the PFC chip failure. , Mains fluctuation state, switch state, poor contact of AC input terminal, etc., which lead to the rise of the chip ground, and the PFC chip is in a chaotic logic state. At this time, the PFC chip cannot perform over-current protection correctly.

Moreover, the ballast of the traditional PFC system will cause a high temperature rise due to the skin effect, which will damage the chip, and the lack of over-current protection of the circuit will cause damage to the chip, so that the entire circuit current is too large and the lighting circuit will be burned.

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