CN202617438U

CN202617438U - LED batteryless driving circuit

Info

Publication number: CN202617438U
Application number: CN 201220231892
Authority: CN
Inventors: 古道雄
Original assignee: SHENZHEN CYT OPTOELECTRONIC TECHNOLOGY CO LTD
Current assignee: Shenzhen Mayor Express Semiconductor Technology Co Ltd
Priority date: 2012-05-22
Filing date: 2012-05-22
Publication date: 2012-12-19
Anticipated expiration: 2022-05-22

Abstract

The utility model relates to an LED batteryless driving circuit which includes a batteryless module, an LED lighting module, and a constant current module. The batteryless module includes a rectification module and a filtering module. The rectification module is connected with the filtering module. The rectification module rectifies the alternating current into the direct current. The filtering module stabilizes the direct current in a set value scope. The LED lighting module is connected with the constant current module, and the LED lighting module and the constant current module are connected with the filtering module. The constant current module stabilizes the working current of the LED lighting module at a rated value. The LED batteryless driving circuit improves the product energy conversion efficiency, reduces the product volume, reduces the total product cost, and improves the product service lifetime.

Description

A kind of LED removes the power supply drive circuit

Technical field

The utility model relates to a kind of drive circuit, particularly a kind of led drive circuit.

Background technology

At present, the global switch formula constant-current source framework of the market mainstream is by AC rectification circuit, filter circuit; The DC translation circuit; Output filter circuit, compositions such as constant-current circuit, the power semiconductor of switching regulator constant-current source can cause powerful Conducted Electromagnetic Interference harmonic interference in switching process; And strong-electromagnetic field radiation. severe contamination periphery electromagnetic environment not only; Near to electric equipment causes electromagnetic interference, so circuit need increase the EMC circuit, can pass through the requirement of Electro Magnetic Compatibility limit value.

And the manufacture craft aspect makes the complicated non-standard component of technical pattern many; Labour intensity is big, the design cycle is long, cost is high, reliability is low etc.; Energy conversion efficiency is lower on aspect electric; Though guarantee for LED constant current function, ignored on the product circuit structure the Electro Magnetic Compatibility requirement, bring the difficulty that is not easy to pass through in the EMI measurement.

The utility model content

The utility model provides a kind of LED to remove the power supply drive circuit, and the energy transition rate that it has improved product dwindles small product size, reduces the whole cost of product, and improves product useful life.

Above-mentioned LED goes the power supply drive circuit to comprise power supply module, LED lighting module and constant flow module,

The said power module that goes comprises rectification module and filtration module, and rectification module and filtration module join, and rectification module is a direct current with AC rectification, and filtration module is stable at direct current in the range of set value;

Said LED lighting module and constant flow module join, and LED lighting module and constant flow module all join with filtration module, and constant flow module is stable at rated value with the operating current of LED lighting module.

Different in the such scheme with prior art, removed the transformer energy transfer mode, go the power supplyization technology to reach simple in structure in design thereby adopt, volume is little, and the power supply transformation efficiency is high, and it reduces power consumption, has simplified designing requirement.

The constant current part; The electric current of constant flow module output is constant, no matter whether input voltage is changing at a high speed, any time on the node; Electric current through LED all is a fixed value; Through the type of drive of this improvement, make the life-span of LED obtain prolonging and having reduced light decay, thereby guarantee high adjustment constant current accuracy.

Preferably, said rectification module is a bridge rectifier.

Bridge rectifier is simply direct, only is made up of four diodes, has reduced the use amount of device, thereby reduces the failure rate of circuit and reduced production cost.

Preferably, said filtration module is an electric capacity, and the positive pole and the rectification module of electric capacity join, and the negative pole and the constant flow module of electric capacity join.

Because be provided with filtration module, thereby make the operating current of LED lighting module more stable, reduced the probability that device damages because of current fluctuation is excessive, thereby make device keep operate as normal for a long time, improved the useful life of device.

Preferably, said electric capacity is electrochemical capacitor.

Preferably, said LED lighting module comprises several led chips, between each led chip for the parallel connection or be connected in series.

Preferably, said LED lighting module also comprises resistance, and resistance and led chip are connected in parallel.

Preferably, said led chip is the high-voltage LED chip.

Because said high-voltage LED chip has more than 2 the PN junction of series connection,, also improved the integrated level of LED so reduced the packaging cost when adopting a plurality of individual LED chip.

Preferably, said constant flow module comprises triode and DC source,

The base stage of said triode and collector electrode all join with the LED lighting module;

Said DC source and transistor emitter join, the emitter of the current direction triode that DC source discharges.

Preferably, said constant flow module also comprises voltage stabilizing didoe, and the positive pole of voltage stabilizing didoe joins through DC source and transistor emitter, and the negative pole of voltage stabilizing didoe and the base stage of triode are joined.

Description of drawings

Fig. 1 is the circuit diagram of the utility model.

Embodiment

The embodiment of the utility model is as shown in Figure 1, comprises power supply module 2, LED lighting module 6 and constant flow module 5.

Wherein, the said power supply module 2 of going comprises bridge rectifier 1 and electrochemical capacitor 3, and electrochemical capacitor 3 positive poles join with bridge rectifier 1; Said bridge rectifier 1 is joined by 4 diodes and forms; Alternate conduction between the diode makes circuit voltage become direct current from alternating current, and 3 pairs of direct currents of electrochemical capacitor carry out filtering, make current stabilization; Prevented to cause components from being damaged because of current fluctuation is excessive; And bridge rectifier 1 is directly simple, has reduced the use amount of device, thereby reduces the failure rate of circuit and reduced production cost.

Said LED lighting module 6 comprises 2 high-voltage LED lamp pearls and resistance R 1; Between the high-voltage LED lamp pearl for being connected in series; Resistance R 1 then is connected in parallel with two LED lamp pearls; And the anodal of high-voltage LED lamp pearl all joins with the positive pole of electrochemical capacitor 3, and wherein said high-voltage LED lamp pearl is made up of the high-voltage LED chip.

Said constant flow module 5 comprises triode Q1, voltage stabilizing didoe ZD1 and DC source U1; The base stage of triode Q1 and collector electrode all join with LED lighting module 6; Be that the collector electrode of triode Q1 and the negative pole of high-voltage LED join, the base stage of triode Q1 is joined through the positive pole of resistance R 1 with high-voltage LED; Said voltage stabilizing didoe ZD1 negative pole and triode Q1 base stage are joined, and voltage stabilizing didoe ZD1 is anodal to join with triode Q1 emitter; Said DC source U1 is connected on the path that voltage stabilizing didoe ZD1 is anodal with triode Q1 emitter is communicated with, the emitter of the current direction triode Q1 that DC source U1 discharges.

When the described LED of the utility model goes the power supply drive circuit works; Bridge rectifier 1 transfers alternating voltage to direct current; 3 pairs of direct currents of electrochemical capacitor carry out Filtering Processing then, make current stabilization in the circuit in certain scope, have avoided the change in current amplitude excessive; Ensure the normal operation of device, filtered electric current is that LED lighting module 6 is supplied power to such an extent that think that the external world provides light source.

And constant flow module 5 is the constant electric currents of LED lighting module 6 lasting outputs; But the direct voltage of output changes along with varying in size of high-voltage LED resistance within the specific limits; When the high-voltage LED resistance diminishes, output voltage step-down then is when the high-voltage LED resistance becomes big; Then output voltage also just uprises, thereby the perseverance of electric currents is with accurate in the assurance high-voltage LED lighting module 6.

The constant current part; The electric current of constant flow module output is constant, no matter whether input voltage is changing at a high speed, any time on the node; Electric current through high-voltage LED all is a fixed value; Through the type of drive of this improvement, make the life-span of high-voltage LED obtain prolonging and having reduced light decay, thereby guarantee high adjustment constant current accuracy.

The improved protection range that also is regarded as patent on the basis of above execution mode.

Claims

1. a LED removes the power supply drive circuit, it is characterized in that: comprise power supply module, LED lighting module and constant flow module,

2. LED according to claim 1 removes the power supply drive circuit, it is characterized in that: said rectification module is a bridge rectifier.

3. LED according to claim 1 removes the power supply drive circuit, it is characterized in that: said filtration module is an electric capacity, and the positive pole and the rectification module of electric capacity join, and the negative pole and the constant flow module of electric capacity join.

4. LED according to claim 3 removes the power supply drive circuit, it is characterized in that: said electric capacity is electrochemical capacitor.

5. LED according to claim 1 removes the power supply drive circuit, it is characterized in that: said LED lighting module comprises several led chips, between each led chip for the parallel connection or be connected in series.

6. LED according to claim 5 removes the power supply drive circuit, it is characterized in that: said LED lighting module also comprises resistance, and resistance and led chip are connected in parallel.

7. LED according to claim 5 removes the power supply drive circuit, it is characterized in that: said led chip is the high-voltage LED chip.

8. LED according to claim 1 removes the power supply drive circuit, it is characterized in that: said constant flow module comprises triode and DC source,

9. LED according to claim 8 removes the power supply drive circuit; It is characterized in that: said constant flow module also comprises voltage stabilizing didoe; The positive pole of voltage stabilizing didoe joins through DC source and transistor emitter, and the negative pole of voltage stabilizing didoe and the base stage of triode are joined.