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non-isolated led drive circuit

An LED drive and isolation technology, applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve the problem that LED drive circuit cannot directly use triac dimmer, LED lamp service life limitation, application circuit design Complex problems, to achieve the effect of long service life, improve service life, reduce electromagnetic interference EMI

Inactive Publication Date: 2016-05-25
XIAN QUANXIN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this structure has been widely used in LED lighting, it must use large electrolytic capacitors and transformers, which limits the service life of LED lights, and the application circuit design is more complicated, making it difficult to miniaturize
In addition, the above LED driver circuit cannot be directly used for triac dimmers, it must be implemented by adding additional circuits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] refer to figure 2 , the controller 2 of this example includes: a timer 21, a comparator 22, a logic gate 23 and a reference module 24; the energy storage unit 3 includes: a diode D1, an inductor L1 and a capacitor C OUT The driven unit 4 includes N LED lamps, N≥2; the rectifier bridge 1 adopts a traditional full-bridge rectification structure; the switching device Q1 adopts an N-type field effect transistor.

[0036] The connections of the components are as follows:

[0037] The output terminal o of the rectifier bridge 1 is connected to the drain of the N-type field effect transistor, the source of the N-type field effect transistor is connected to the input terminal a of the energy storage unit 3, and the sampling resistor R S Connected to the reference ground, the sampling resistor R S The voltage on the sampling signal V S .

[0038] The negative terminal of the diode D1 is used as the input terminal a of the energy storage unit 3, and its positive terminal is ...

Embodiment 2

[0047] refer to Figure 5 , the rectifier bridge 1 of the present example, the controller 2, the parts adopted by the energy storage unit 3 and the switching device Q1, and the connection relationship between the parts are all the same as in the embodiment 1; the driven unit 4 includes M LED lamps , M≥1.

[0048] The M LED lamps adopt a parallel connection structure; the positive terminals of the M LED lamps are connected to the output terminal d of the energy storage unit 3; the negative terminals are connected to the output terminal c of the energy storage unit 3; the positive terminals of the M LED lamps or The negative terminal can be used as the ground terminal g, and the negative terminal is selected as the ground terminal g in this example.

[0049] This example works as follows:

[0050] according to Figure 5 The working current flow direction of the given LED drive circuit. When the N-type field effect transistor was turned on, the timer 21 began counting, and th...

Embodiment 3

[0052] refer to Figure 6 , the rectifier bridge 1 of this example, the parts used by the controller 2 and the energy storage unit 3, and the connection relationship between the parts are all the same as in the embodiment 1; the driven unit 4 includes H LED lights, H≥3 ; Switching device Q1 adopts N-type triode.

[0053] The H LED lamps adopt a series-parallel connection structure, and the connection methods are various. The connection method selected in this example is: the H-1th LED lamp is connected in parallel with the H-th LED lamp, and then connected in series with the remaining H-2 LED lamps; The positive terminal of one LED lamp is connected to the output terminal d of the energy storage unit 3; the negative terminals of the H-1th LED lamp and the Hth LED lamp are connected to the output terminal c of the energy storage unit 3; the H LED lamps The positive or negative terminal of any one of the LED lamps can be used as the ground terminal g. In this example, the negat...

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Abstract

The invention discloses a non-isolated LED driving circuit. The non-isolated LED driving circuit mainly solves the problems that in the prior art, an application circuit is complex, short in service life, small in power factor and strong in electromagnetic interference. The non-isolated LED driving circuit comprises a rectifier bridge (1), a controller (2), an energy storage unit (3) and a driven unit (4); the output end o of the rectifier bridge (1) is connected to the input end a of the energy storage unit (3) through a switching element Q1; a sampling resistor RS is connected between the input end a and the input end b of the energy storage unit (3) in a crossing mode and is used for sampling currents flowing through the energy storage unit (3) and generating sampling signals VS; the controller (2) controls the switching element Q1 to be turned on or off by judging the magnitude of the sampling signals VS; both the two output ends of the energy storage unit (3) are connected to the driven unit (4) to supply a working voltage and a working current for the driven unit (4). According to the non-isolated LED driving circuit, the application circuit is effectively simplified, service life is prolonged, the power factor and the electromagnetic interference situation are improved, and the non-isolated LED driving circuit can be used for triode-thyristor light modulators and non-isolated AC-DC converters.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a non-isolated LED drive circuit, which is suitable for triac dimmers and non-isolated AC-DC converters. Background technique [0002] Light-emitting diodes are referred to as LEDs for short. Diodes made of compounds of gallium (Ga), arsenic (As), and phosphorus (P) can radiate visible light when electrons and holes recombine, so they can be used to make light-emitting diodes. According to the "2013-2017 China LED Lighting Industry Market Prospect and Investment Strategic Planning Analysis Report", the LED lighting market has always been considered to be the most important and most promising application of LED. The development of LED lighting is very favorable, mainly as follows: 1) Energy saving and emission reduction has become a topic of global concern and has been actively promoted; 2) Traditional light source technology is growing slowly and facing development b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 来新泉韩杰何惠森邵丽丽
Owner XIAN QUANXIN ELECTRONICS
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