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Isolated driving power for high-power light emitting diode

A light-emitting diode and drive power technology, applied in the field of isolated drive power, can solve the problems of large volume, short life, and many devices, and achieve the effects of simplifying components, prolonging life, and simple circuit control

Inactive Publication Date: 2012-12-12
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although power factor correction can be realized in this way, the safety isolation requirements of civil lighting can be met, and the luminous quality of LED can be better guaranteed, but there are still serious defects such as many components, large volume, high cost, and short life, which are difficult to achieve. Promote in actual public or civilian occasions

Method used

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  • Isolated driving power for high-power light emitting diode
  • Isolated driving power for high-power light emitting diode
  • Isolated driving power for high-power light emitting diode

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Such as figure 1 As shown, the driving power supply of the present invention mainly includes a rectifier bridge, an input first capacitor C1, an output capacitor C2, a transformer TX1, a pulse width modulation control circuit, and a rectifier circuit. The rectifier bridge is composed of diodes D1 to D4, the anode of diode D1 and the anode of diode D2 are AC input terminals, the cathode of diode D1 is a DC positive voltage output terminal, and the anode of diode D4 is a DC negative voltage output terminal. The same-named end of the primary winding of the transformer TX1 is connected to the DC positive voltage output end of the rectifier bridge, the different end is connected to the drain of the power switch Q1, the source of the power switch Q1 is connected to the DC negative voltage output end of the rectifier bridge, and the two ends of the capacitor C1 are respectively connected The DC output of the rectifier bridge is positive and negative.

[0021] The same-named end o...

Embodiment 2

[0027] Such as Figure 5 As shown, the difference from the first embodiment is that the diode D6 of the sampling and rectification circuit is replaced by a Zener diode Z1, the anode of the Zener diode Z1 is connected to the voltage input terminal, and the cathode is connected to the connection point of the resistors R1 and R2.

Embodiment 3

[0029] Such as Image 6 As shown, the difference from the first embodiment is that the sampling and rectification circuit is connected in parallel with a resistor R4 at both ends of the voltage input terminal.

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Abstract

The invention discloses an isolated driving power for a high-power light emitting diode (LED), comprising a rectification circuit and a flyback converting circuit, wherein the flyback converting circuit mainly is formed by connecting a transformer, a power switch pipe and a pulse width modulation control circuit. The isolated driving power is characterized by comprising a current sampler and a sampling and shaping circuit, wherein the current sampler is used for sampling currents in a secondary output circuit of the transformer; the sampling and shaping circuit is used for feeding back the sampled currents into the pulse width modulation control circuit after the sampled currents are shaped; the current sampler is connected in the secondary output circuit of the transformer, and after being shaped by the sampling and shaping circuit, the output end of the current sampler is connected to the pulse width modulation control circuit; after current signals are sampled in the secondary output circuit of the transformer and then are fed back and input into the pulse width modulation control circuit, the sampled signals are compared with reference voltage by the pulse width modulation control circuit so as to generate pulse width modulation signals, and the pulse width modulation control circuit is in driving connection with an original power switching pipe of the transformer, therebyrealizing the purpose that the circuit can drive the voltage output of the LED.

Description

Technical field [0001] The invention relates to a driving power supply, in particular to an isolated driving power supply for high-power light-emitting diodes. Background technique [0002] In recent years, as a new type of light source, light-emitting diodes (LEDs) have received more and more attention and attention. Compared with traditional lighting sources, LED light sources have many obvious advantages such as high efficiency, high reliability, no pollution, and high simulation of natural light. How to manufacture a high-efficiency, low-cost, high-power factor, and long-life LED drive power supply is the key to ensuring the luminous quality and overall performance of the LED. [0003] Traditional LED driving methods have multiple modes such as resistance current limiting, linear regulation, charge pump and switching converter. Among them, the first three are only suitable for non-illumination systems with low precision requirements and low light color requirements; switching...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/08H05B37/02
Inventor 尹向阳龚晟
Owner MORNSUN GUANGZHOU SCI & TECH