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LED (Light-Emitting Diode) drive circuit and short-circuit protection circuit

A short-circuit protection circuit and light-emitting diode technology, which can be used in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection devices for automatic disconnection, etc., and can solve the damage of inductance L and diode D And other issues

Inactive Publication Date: 2012-09-19
GREEN SOLUTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the voltage of the input power supply Vin will continue to be pressed across the inductor L, and the inductor L and the diode D may be damaged.

Method used

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  • LED (Light-Emitting Diode) drive circuit and short-circuit protection circuit
  • LED (Light-Emitting Diode) drive circuit and short-circuit protection circuit
  • LED (Light-Emitting Diode) drive circuit and short-circuit protection circuit

Examples

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Embodiment Construction

[0053] See figure 2 , is a schematic circuit diagram of a power conversion circuit according to a first preferred embodiment of the present invention. The power conversion circuit includes a conversion controller 100, a conversion circuit 110 and a short circuit protection circuit for converting a power of an input power Vin into an output voltage Vout to drive a load Ld, wherein the conversion circuit 110 includes a capacitor C To stabilize the output voltage Vout. In this embodiment, the conversion circuit may be an AC-to-DC conversion circuit or a DC-to-DC conversion circuit, for example: a full-bridge converter (Full-Bridge Converter), a half-bridge converter (Half-Bridge Converter), an inverter Flyback Converter, Forward Converter, Step-Up Converter, Step-Down Converter, etc. A current detection unit Rs is coupled to the load Ld to generate a current feedback signal IFB according to the current of the load Ld. The conversion controller 100 receives the current feedbac...

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PUM

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Abstract

The invention provides an LED (Light-Emitting Diode) drive circuit and a short-circuit protection circuit. The LED drive circuit is used for driving an LED module and comprises a conversion circuit, a conversion control circuit and the short-circuit protection circuit. The conversion circuit is coupled with an input power supply to convert power of the input power supply into output current so as to drive the LED module, and comprises a capacitor coupled with the LED module. The conversion control circuit is used for controlling the conversion circuit according current flowing through the LED module so as to make the current the LED module stable at a preset current value. The short-circuit protection circuit is coupled with the LED module and is used for cutting off the current of the LED module when judging that the current of the LED module exceeds a current protection value.

Description

technical field [0001] The invention relates to a short circuit protection circuit and a light emitting diode driving circuit. Background technique [0002] See figure 1 , is a circuit schematic diagram of a traditional DC-to-DC boost conversion circuit. The DC-to-DC boost conversion circuit includes an inductor L, a diode D, a capacitor C, a switch SW and a controller Con, which is used to connect the power of an input power supply Vin and convert it into an output voltage Vout to drive a light-emitting diode Module Ld glows. In order to make the light-emitting diode module Ld emit light stably, the controller Con will use a voltage detection circuit VD to detect the level of the output voltage Vout to generate a voltage feedback signal VFB to control the duty cycle of the switch SW to stabilize the output voltage Vout. This makes the LED module Ld emit light stably. [0003] In order to make each of the LEDs in the LED module Ld flow the same current and generate the s...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02H9/02H02H3/087
Inventor 王政雄詹家明
Owner GREEN SOLUTION TECH CO LTD