Power supply circuit and LED drive circuit using the same

A power supply circuit and circuit technology, applied in the field of electronics, can solve problems such as dimmer LED flickering

Active Publication Date: 2018-01-09
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a power supply circuit and an LED driving circuit using it to solve the problem of LED flickering caused by irregular power consumption of dimmers in the prior art

Method used

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  • Power supply circuit and LED drive circuit using the same
  • Power supply circuit and LED drive circuit using the same
  • Power supply circuit and LED drive circuit using the same

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Embodiment Construction

[0042] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0043] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0044] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

The invention discloses a power supply circuit and an LED drive circuit using the same. A constant-current control circuit converts a power output current into a constant second current; when the second current is greater than the current needed by a light modulator, a shunt circuit shunts the second current and an energy storage circuit stores energy; when the second current is less than or equalto the current needed by the light modulator, the energy storage circuit releases the energy and, together with the constant-current control circuit, provides power for the light modulator. A power supply is coupled to a power stage of the LED drive circuit by an auxiliary winding; when the light modulator consumes power irregularly, because the second current outputted by the constant-current control circuit is in a constant current state all the time, the current outputted by the auxiliary winding is not affected and thus the output current from a main power stage is not affected by the light modulator, thereby guaranteeing that the LED does not scintillate. Besides, the LED power supply circuit has a simple structure; integration is realized conveniently; and the production cost is low.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a power supply circuit and an LED driving circuit using the same. Background technique [0002] LED is called the fourth-generation lighting source or green light source. It has the characteristics of energy saving, environmental protection, long life, and small size. It can be widely used in various lighting fields. As a new type of green light source product, LED must be the future development Trend, the LED dimming signal generator is an electrical device used to change the luminous flux of the light source in the LED lighting device and adjust the illumination level. The choice of the power supply mode of the dimmer will also directly affect the LED light emission. [0003] The power supply method of the traditional dimming signal generator is through the AC-DC conversion circuit, such as figure 1 As shown, but such an implementation method has a large system volume, is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH02M1/32H02M3/156H02M3/335H02M3/33576H05B45/345H05B45/385Y02B20/30H05B45/375H05B45/10H05B45/38H05B45/3725H05B45/397H02M1/0087H02M1/007H02M7/06H02M3/33523
Inventor 赖洪斌王建新
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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