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LED (light-emitting diode) drive circuit

A technology for driving and starting circuits for LEDs, applied in circuit devices, circuit layouts, battery circuit devices, etc., can solve the problems of large chip loss, high cost of driving chips, and low power conversion efficiency, so as to reduce chip costs and improve efficiency Effect

Active Publication Date: 2010-10-27
FREMONT MICRO DEVICES SHENZHEN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a low-cost, low chip loss and high power conversion efficiency for the defects of high cost of the drive chip, large loss of the chip itself, and low power conversion efficiency in the prior art LED drive circuit. LED drive circuit

Method used

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  • LED (light-emitting diode) drive circuit
  • LED (light-emitting diode) drive circuit
  • LED (light-emitting diode) drive circuit

Examples

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Embodiment Construction

[0020] Figure 4 It is a functional block diagram of an embodiment of an LED drive circuit provided by the present invention, wherein:

[0021] AC input: for mains input;

[0022] Rectification and filtering: the diode rectifier bridge 2 and the filter capacitor 3 are connected in parallel to realize the conversion of AC input power into DC output;

[0023] LED string light-emitting circuit: several light-emitting diodes 16 connected in series, LED string energy storage inductors 19 and LED string freewheeling diodes 14, LED string energy storage inductors 19 are boosted to directly drive LED strings through LED string freewheeling diodes 14;

[0024] Power control circuit: a feedback circuit formed by connecting the power control MOS tube 18 and the current detection resistor 7 in series;

[0025] Switch pulse control circuit: a switch pulse chip, the switch pulse chip is a PWM control chip or a PFM control chip, the switch pulse drive power generated by the switch pulse ch...

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Abstract

The invention relates to an LED drive circuit, which comprises a rectification filter circuit, a starting circuit, a switching pulse control circuit, a power control circuit, an auxiliary power supply circuit and an LED serial light-emitting circuit, wherein the starting circuit comprises a starting MOS (Metal Oxide Semiconductor) tube, a divider resistor and a starting voltage-regulator diode; the power control circuit comprises a power control MOS tube and a current detection resistor; high-voltage alternating current is input and is converted into high-voltage direct current after passing through the rectification filter circuit; the high-voltage direct current is converted into low voltage required by the switching pulse control circuit after passing through the starting circuit to enable the switching pulse control circuit to generate switching pulses; the duty ratio of the pulses generated is controlled by the power control circuit; and the starting circuit also comprises an energy-storing inductor which is connected with a flywheel diode in series. A user drive chip does not need integrated high voltage by using the LED drive circuit, and therefore, the cost is low and the self loss is small; moreover, the energy-storing inductor and the flywheel diode are used for charging the auxiliary circuit when the power control MOS tube is in a closed state, and thereby, the power supply conversion efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of LED lighting, in particular to an LED driving circuit. Background technique [0002] LED lighting is gradually replacing most traditional lighting methods with many advantages such as high efficiency and energy saving, environmental protection and pollution-free, good visual effects, long life, and no flicker. Ordinary LED lamps gather many LED lamp beads together to make a style similar to traditional lamps, such as LED fluorescent lamps, LED ceiling lamps, LED spotlights and the like. However, in the technical field of LED lighting, there are still many problems that hinder the popularization and application of LED lighting. These problems include low LED luminous efficiency caused by heat generation, and low conversion efficiency of driving circuits. [0003] There are three main types of LED drive circuits commonly used at present: [0004] figure 1 It shows the principle of an LED drive circuit in...

Claims

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Application Information

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IPC IPC(8): H05B37/00H05B37/02H02M7/06H02J7/00F21V23/00F21Y101/02
Inventor 谷文浩朱建培马浩瑞
Owner FREMONT MICRO DEVICES SHENZHEN LTD
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