Synchronous switch boost transducer of light emitting diode driver

Abstract

This invention puts forward a boosting converter for driving semiconductor devices such as LED including: a supply end for receiving DC supply, a driving output end for providing driving supply to the semiconductor light emitting device, a switch component and a synchronous component, the switch states of which are opposite and matched to each other to adjust the driving supply and a short circuit test device to test if the light emitting device is at the short circuit state, if so, the synchronous switch component and the switch component are closed at the same time.

Description

technical field [0001] The present invention relates to a booster converter, in particular to a synchronous switch booster converter for a light emitting diode (Light Emitting Diode; LED) driver. Background technique [0002] Traditional LED drivers are mostly based on boost architecture. The main components of a typical conventional boost converter can be found in figure 1 . figure 1 A schematic circuit diagram showing a conventional boost converter for driving LEDs, which includes a conventional boost converter 1 , a DC power supply 2 , and a LED module 3 . The conventional boost converter 1 includes a power terminal X, an inductor L, a diode D, a switch SW, a capacitor C, and a driving output Y. The state of the switch element SW is switched between on and off during normal operation. When the switching element SW is turned on, a current flows through the inductor L and stores electromagnetic energy therein. At this time, the diode D is in a reverse bias state to avo...

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Problems solved by technology

[0003] However, the boost converter with this traditional architecture lacks a protection mechanism when the load terminal is short-circuited

In other words, when the light-emitting diode module 3 in the above example is short-circuited, even if the switching component SW therein is in a closed state, the diode will still conduct, which will easily cause the danger of the entire circuit, or even burn it out.

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