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Non-isolated LED driving circuit

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

Inactive Publication Date: 2014-02-19
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 rectifier structure; the switching device Q1 adopts an N-type field effect transistor.

[0036] The connection relationship of the various components is 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 is passed through the S Connected to the reference ground, the sampling resistor R S The voltage on the sampled signal V S .

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

Embodiment 2

[0047] refer to Figure 5 , the components used in the rectifier bridge 1, the controller 2, the energy storage unit 3 and the switching device Q1 in this example, and the connection relationship between the components are the same as those in the embodiment 1; the driven unit 4 includes M LED lights , M≥1.

[0048] The M LED lamps are connected in parallel; the positive terminals of the M LED lamps are connected to the output terminal d of the energy storage unit 3; the negative terminal is 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. In this example, the negative terminal is selected as the ground terminal g.

[0049] This example works as follows:

[0050] according to Figure 5 The working current of the given LED driver circuit flows. When the N-type field effect transistor is turned on, the timer 21 starts to count, and the charging current I ...

Embodiment 3

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

[0053] The H LED lamps are connected in series and parallel, and the connection methods are various. The connection method selected in this example is: the H-1 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 terminal or the negative terminal of any one of the LED lamps can be used as the ground terminal g. In t...

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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 driving circuit, which is suitable for a three-terminal thyristor dimmer and a non-isolated AC-DC converter. 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 regarded as the most important and 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 has grown slowly and faces de...

Claims

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Application Information

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Patent Type & Authority Applications(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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