CN202617439U - LED constant current driving circuit - Google Patents
LED constant current driving circuit Download PDFInfo
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- CN202617439U CN202617439U CN 201220232180 CN201220232180U CN202617439U CN 202617439 U CN202617439 U CN 202617439U CN 201220232180 CN201220232180 CN 201220232180 CN 201220232180 U CN201220232180 U CN 201220232180U CN 202617439 U CN202617439 U CN 202617439U
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Abstract
The utility model relates to an LED constant current driving circuit which includes a rectification module, a boost module, a constant current module, and an LED lighting module. The rectification module is connected with the boost module. The rectification module rectifies the alternating current into the direct current. The boost module boosts the rectified circuit voltage to a rated value. The boost module is also connected with the LED lighting module. The working voltage of the LED lighting module is the boosted circuit voltage. The LED lighting module is also connected with the constant current module. The constant current module stabilizes the working voltage of the LED lighting module at the rated value. The LED constant current driving circuit can maintain the conventional switch type constant current source function, improve the energy conversion efficiency and the reliability, further enhance the service lifetime of the product, and reduce the total product cost.
Description
Technical field
The utility model relates to a kind of drive circuit, particularly a kind of led drive circuit.
Background technology
LED constant-current drive circuit on the market generally uses the switching regulator constant-current source; But the efficient of switching regulator constant-current source still is lower than 90% at present, and owing to generally all be lower than 10000 hours the useful life of individual devices in the Switching Power Supply, yet the life-span of LED can reach 8～100,000 hours; But after power supply damages; Light fixture promptly can not use, and causes occurring the energy-conservation difficult situation that does not save money of LED light fixture, thereby has a strong impact on promoting the use of of LED light fixture.
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 the strong-electromagnetic field radiation, not only the severe contamination periphery electromagnetic environment causes electromagnetic interference near electric equipment; So circuit need increase the EMC circuit, can pass through the requirement of Electro Magnetic Compatibility limit value.
Therefore existing manufacture craft makes technical pattern become complicated; Cause non-standard component many; Labour intensity is big, the design cycle is long, cost is high, reliability is low etc., aspect electric on energy conversion efficiency lower, and the low effective lifting that is difficult to make the power utilization rate of power factor.
The utility model content
The utility model purpose is to provide a kind of LED constant-current drive circuit, makes its function that keeps conventional switch formula constant-current source, and improves energy conversion efficiency and reliability, with the useful life of further reinforcement product, and reduces the whole cost of product simultaneously.
Above-mentioned LED constant-current drive circuit comprises rectification module, boost module, constant flow module and LED lighting module,
Said rectification module and boost module join, and rectification module is a direct current with AC rectification, and the circuit voltage of boost module after with rectification rises to rated value;
Said boost module also joins with the LED lighting module, and the operating voltage of LED lighting module is the circuit voltage after boosting;
Said LED lighting module also joins with constant flow module, and constant flow module is stable at rated value with the operating current of LED lighting module.
Power factor refers to the relation between effective power and the total power consumption (apparent power), and just effective power is divided by the ratio of total power consumption (apparent power).Basically power factor can be weighed the degree that electric power is used effectively, and when power factor value is big more, represents its electric power utilance high more.
And boost module promotes the voltage of circuit, reduces the phase difference between current/voltage and compensates, thereby the power factor of circuit is improved, and has promptly improved the transformation efficiency of energy; And the utility model need not be provided with the input rectifying filter circuit, and circuit is simplified more, reduced the use amount of device, thereby makes failure rate that has reduced circuit and the production cost that has reduced circuit.
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 boost module is the PFC correcting circuit.
Adopt the PFC correcting circuit to make power factor of electric network can bring up to 0.95 ~ 0.99, reduced Harmonics of Input, both administered harmonic pollution, improved the whole efficiency of power supply again electrical network.
Preferably, said PFC correcting circuit comprises control chip, and control chip is connected to boost inductance and booster diode,
Said boost inductance one end and rectification module join, and the other end and booster diode positive pole join, control chip control boost inductance hocket electric energy absorption and emit;
Said booster diode negative pole and LED lighting module join, and the electrical energy flows that boost inductance discharges is boosted through booster diode.
Said control chip is LED low-voltage driving chip or LED high drive chip.
Preferably, be provided with filtration module between said PFC correcting circuit and the LED lighting module.
Because be provided with filtration module between PFC correcting circuit and the LED lighting module; Thereby make the operating current of LED lighting module more stable; Reduce the probability that device damages because of current fluctuation is excessive, thereby made device keep operate as normal for a long time, improved the useful life of device.
Preferably, said filtration module is an electrochemical capacitor, and electrochemical capacitor is anodal to join with the booster diode negative pole.
Preferably, said constant flow module is the DC source power supply circuits.
Preferably, said DC power-supply circuit comprises triode, voltage stabilizing didoe and DC source,
The base stage of said triode and collector electrode all join with the LED lighting module;
Said voltage stabilizing didoe negative pole and transistor base join, and voltage stabilizing didoe is anodal to join with transistor emitter;
Said DC source is connected on the path that voltage stabilizing didoe is anodal with transistor emitter is communicated with, the emitter of the current direction triode that DC source discharges.
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 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.
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 rectification module 1, boost module 6, constant flow module 7 and LED lighting module 8.
Said rectification module 1 joins with boost module 6, and boost module 6 joins with LED lighting module 8, and LED lighting module 8 also joins with constant flow module 7.
Said rectification module 1 is a bridge rectifier; Join by 4 diodes and to form; Alternate conduction between the diode makes circuit voltage become direct current from alternating current; And bridge rectifier is simply direct, has reduced the use amount of device, thereby reduces the failure rate of circuit and reduced production cost.
Said boost module 6 is the PFC correcting circuit, adopts the PFC correcting circuit to make power factor of electric network can bring up to 0.95 ~ 0.99, has reduced Harmonics of Input, has both administered the harmonic pollution to electrical network, has improved the whole efficiency of power supply again.
Said PFC correcting circuit comprises LED high drive chip IC 1; LED high drive chip IC 1 inside is provided with the MOSFET FET; And LED high drive chip IC 1 is connected to boost inductance 2 and booster diode 4; Boost inductance 2 one ends and rectification module 1 join, and the other end and booster diode 4 positive poles join, and booster diode 4 negative poles and LED lighting module 8 join; And the path that booster diode 4 is communicated with LED lighting module 8 is provided with electrochemical capacitor 5, and the negative pole of the positive pole of electrochemical capacitor 5 and booster diode 4 joins.
Said LED lighting module 8 comprises 4 high-voltage LED lamp pearls; Between each high-voltage LED lamp pearl for being connected in series; Wherein said high-voltage LED pearl is made up of 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.
Said constant flow module 7 comprises triode, voltage stabilizing didoe and DC source, and the base stage of triode and collector electrode all join with LED lighting module 8, and promptly the negative pole of the collector electrode of triode and LED joins, and the base stage of triode is joined through the positive pole of resistance and LED; Said voltage stabilizing didoe negative pole and transistor base join, and voltage stabilizing didoe is anodal to join with transistor emitter; Said DC source is connected on the path that voltage stabilizing didoe is anodal with transistor emitter is communicated with, the emitter of the current direction triode that DC source discharges.
When the described LED constant-current drive circuit of the utility model is worked; Bridge rectifier transfers alternating voltage to direct current, and LED high drive chip IC 1 is according to the conducting and the shutoff of control signal control MOSFET FET, and control signal is from the signal generating module 3 of LED high drive chip IC 1 inside; Signal generating module 3 comprises diode, resistance and triode; Diode and resistance are connected in parallel, and diode cathode and transistor base join, when the conducting of MOSFET FET; Boost inductance 2 absorbs and store electrical energy; When the MOSFET FET turn-offed, boost inductance 2 was emitted the electric energy that stores, thereby the electrical energy flows that boost inductance 2 is emitted is promoted to rated value through booster diode 4 with the operating voltage of LED lighting module 8; And have electrochemical capacitor 5 to carry out filtering between booster diode 4 and the LED lighting module 8, make the operating current of LED lighting module 8 more stable.
And constant flow module 7 is the constant electric currents of LED lighting module 8 lasting outputs; But the direct voltage of output changes along with varying in size of LED resistance within the specific limits; When the LED resistance diminishes, output voltage step-down then is when the LED resistance becomes big; Then output voltage also just uprises, thereby the perseverance of electric current is with accurate in the assurance LED lighting module.
Because power factor refers to the relation between effective power and the total power consumption (apparent power), just effective power is divided by the ratio of total power consumption (apparent power).Basically power factor can be weighed the degree that electric power is used effectively, and when power factor value is big more, represents its electric power utilance high more.
And boost module 6 promotes the voltage of circuit, reduces the phase difference between current/voltage and compensates, thereby the power factor of circuit is improved, and has promptly improved the transformation efficiency of energy; And the utility model need not be provided with the input rectifying filter circuit, and circuit is simplified more, reduced the use amount of device, thereby makes failure rate that has reduced circuit and the production cost that has reduced circuit.
The improved protection range that also is regarded as patent on the basis of above execution mode.
Claims (10)
1. LED constant-current drive circuit is characterized in that: comprise rectification module, boost module, constant flow module and LED lighting module,
Said rectification module and boost module join, and rectification module is a direct current with AC rectification, and the circuit voltage of boost module after with rectification rises to rated value;
Said boost module also joins with the LED lighting module, and the operating voltage of LED lighting module is the circuit voltage after boosting;
Said LED lighting module also joins with constant flow module, and constant flow module is stable at rated value with the operating current of LED lighting module.
2. LED constant-current drive circuit according to claim 1 is characterized in that: said rectification module is a bridge rectifier.
3. LED constant-current drive circuit according to claim 1 is characterized in that: said boost module is the PFC correcting circuit.
4. LED constant-current drive circuit according to claim 3 is characterized in that: said PFC correcting circuit comprises control chip, and control chip is connected to boost inductance and booster diode,
Said boost inductance one end and rectification module join, and the other end and booster diode positive pole join, control chip control boost inductance hocket electric energy absorption and emit;
Said booster diode negative pole and LED lighting module join, and the electrical energy flows that boost inductance discharges is boosted through booster diode;
Said control chip is LED low-voltage driving chip or LED high drive chip.
5. LED constant-current drive circuit according to claim 4 is characterized in that: be provided with filtration module between said PFC correcting circuit and the LED lighting module.
6. LED constant-current drive circuit according to claim 5 is characterized in that: said filtration module is an electrochemical capacitor, and electrochemical capacitor is anodal to join with the booster diode negative pole.
7. LED constant-current drive circuit according to claim 1 is characterized in that: said constant flow module is the DC source power supply circuits.
8. LED constant-current drive circuit according to claim 7 is characterized in that: said DC power-supply circuit comprises triode, voltage stabilizing didoe and DC source,
The base stage of said triode and collector electrode all join with the LED lighting module;
Said voltage stabilizing didoe negative pole and transistor base join, and voltage stabilizing didoe is anodal to join with transistor emitter;
Said DC source is connected on the path that voltage stabilizing didoe is anodal with transistor emitter is communicated with, the emitter of the current direction triode that DC source discharges.
9. according to each described LED constant-current drive circuit of claim 1-8, 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.
10. LED constant-current drive circuit according to claim 9 is characterized in that: said led chip is the high-voltage LED chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220232180 CN202617439U (en) | 2012-05-22 | 2012-05-22 | LED constant current driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220232180 CN202617439U (en) | 2012-05-22 | 2012-05-22 | LED constant current driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202617439U true CN202617439U (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220232180 Expired - Lifetime CN202617439U (en) | 2012-05-22 | 2012-05-22 | LED constant current driving circuit |
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| CN (1) | CN202617439U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107153220A (en) * | 2017-06-08 | 2017-09-12 | 三峡大学 | A kind of nuclear magnetic resonance water detector emitter based on dynamic compensation |
-
2012
- 2012-05-22 CN CN 201220232180 patent/CN202617439U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107153220A (en) * | 2017-06-08 | 2017-09-12 | 三峡大学 | A kind of nuclear magnetic resonance water detector emitter based on dynamic compensation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518000 Guangdong City, Nanshan District province high tech in the middle of the two road, No. 2 Shenzhen International Software Park, room 201-205, room, 4 (only office) (222-226) Patentee after: Shenzhen mayor express Semiconductor Technology Co., Ltd. Address before: 518057, No. 2, building 4, two software park, central science and technology, Nanshan District New District, Shenzhen, Guangdong Patentee before: Shenzhen CYT Optoelectronic Technology Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121219 |
|
| CX01 | Expiry of patent term |