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Constant current direct-driven type LED switching power supply

A switching power supply, direct drive technology, applied in the direction of electric light source, DC power input into DC power output, AC power input into DC power output, etc. The problem of large size of the power supply can achieve the effect of low loss, avoiding magnetic loss and small output ripple.

Inactive Publication Date: 2015-04-15
QINGDAO XINMEI POWER SUPPLY TECH
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  • Abstract
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Problems solved by technology

[0002] In the prior art, the components of the LED driving switching power supply include high-power-consuming devices such as switching transformers and output inductors, so that the power efficiency of the entire switching power supply is not high, and due to the inclusion of switching transformers and output inductors, the entire switching power supply The volume becomes larger and inconvenient to use

Method used

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  • Constant current direct-driven type LED switching power supply

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Embodiment Construction

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0023] figure 1 It is a schematic structural diagram of the constant current direct drive LED switching power supply circuit of the present invention, as figure 1 As shown, the constant current direct drive LED switching power supply provided by the present invention includes a rectifier bridge 10, an LED string 9 connected between the positive and negative poles of the rectifier bridge 10, ...

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Abstract

The invention provides a constant current direct-driven type LED switching power supply comprising a rectifier bridge, and LED strings which are connected between the positive and negative electrodes of the rectifier bridge. The constant current direct-driven type LED switching power supply also comprises a current sampling resistor which is used for acquiring current signals of the LED strings, an NMOS transistor which is connected among the LEDs, a freewheeling diode which is connected on the D and s of the NMOS transistor, a totem-pole circuit which is formed by a first NPN transistor and a first PNP transistor, a biasing resistor of the first NPN transistor, and a Schmitt circuit which is formed by the first NPN transistor and a second NPN transistor. The switching power supply is low in loss and can be modularized and integrated on chips.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a constant current direct drive LED switching power supply. Background technique [0002] In the prior art, the components of the LED driving switching power supply include high-power-consuming devices such as switching transformers and output inductors, so that the power efficiency of the entire switching power supply is not high, and due to the inclusion of switching transformers and output inductors, the entire switching power supply The volume becomes large and inconvenient to use. Contents of the invention [0003] The object of the present invention is to solve the above-mentioned defects in the prior art, and provide a switching power supply with high power supply efficiency, which can realize modularization and chip formation. [0004] In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical solutions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H05B37/02
CPCH02M3/1584H02M7/217H05B47/10
Inventor 曲日
Owner QINGDAO XINMEI POWER SUPPLY TECH
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