CN202435663U - Non-isolated LED constant-current driving power source with high power factor - Google Patents
Non-isolated LED constant-current driving power source with high power factor Download PDFInfo
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- CN202435663U CN202435663U CN2011205371993U CN201120537199U CN202435663U CN 202435663 U CN202435663 U CN 202435663U CN 2011205371993 U CN2011205371993 U CN 2011205371993U CN 201120537199 U CN201120537199 U CN 201120537199U CN 202435663 U CN202435663 U CN 202435663U
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Abstract
The utility model discloses a non-isolated LED constant-current driving power source with a high power factor, relating to an electronic technology. The non-isolated LED constant-current driving power source comprises an EMI (Electro-Magnetic Interference) filtering unit, a rectifying and filtering unit, a PFC (Power Factor Correction) unit, a PWM (Pulse Width Modulation) constant-current control unit, a current feedback unit, a BUCK conversion unit and an output unit, wherein the EMI filtering unit, the rectifying and filtering unit, the PFC unit and the output unit are sequentially connected in series; the output end of the PFC unit is also connected to the PWM constant-current control unit; the BUCK conversion unit is connected with the output unit and the PWM constant-current control unit; and the output unit is also connected with the PWM constant-current control unit through the current feedback unit. The non-isolated LED constant-current driving power source has the beneficial effects that the current harmonics are effectively reduced, constant-current output is realized, the line regulation rate is smaller than +/-5%, the load regulation rate is smaller than +/-3%, and therefore, an LED is more stable in working.
Description
Technical field
The utility model relates to electronic technology.
Background technology
LED has advantages such as environmental protection, energy-conservation, life-span length, high brightness and is regarded as the 21 century lighting source, has begun to replace various traditional lightings at present and has been widely used in various practical occasions.But; Because its driving power of LED self character decision can not adopt same power supply with ordinary incandescent lamp; In order to avoid voltage fluctuation causes electric current to increase and LED is damaged; Thereby must design new power supply and fully satisfy the LED required driving requirement of working, thereby bring into play the performance of LED to greatest extent, reduce failure rate.Yet the driveability of existing various LED driving powers is undesirable, and having influenced LED must apply.Fig. 3 is existing LED driving power work principle figure.It at first carries out the voltage exchange to voltage of input input, providing late-class circuit required voltage, and then links to each other with LED through directly connecting a current-limiting resistance behind the rectifying and wave-filtering.But this LED driving power can't be adjusted the operating current fluctuation at the LED two ends that cause because of external voltage fluctuation, when input voltage fluctuation is big even can cause LED to damage; Secondly, this LED driving power can't be adjusted causing that owing to reasons such as temperature the operating current that flows through LED changes; In addition, the same phasic property of the voltage and current of this LED driving power is relatively poor, and power factor (PF) is very low.
The utility model content
The utility model technical problem to be solved provides that a kind of electric current to LED is accurately adjusted, high power factor, the new strong LED driving power of electromagnetic compatibility.
The technical scheme that the utility model solve the technical problem employing is; Non-isolation high power factor LED constant-current driving power supply; It is characterized in that; Comprise EMI filter unit, rectification filtering unit, PFC correcting unit, PWM constant current control unit, current feedback unit, BUCK converting unit and output unit, EMI filter unit, rectification filtering unit, PFC correcting unit and output unit is in sequential series is connected, the output of PFC output unit is also connected to PWM constant current control unit; The BUCK converting unit connects output unit and PWM constant current control unit, and output unit also connects PWM constant current control unit through the current feedback unit.
The beneficial effect of the utility model is to utilize the EMI filter unit effectively to suppress the electromagnetic interference of constant-current supply, thereby make power supply meet electromagnetic radiation harassing and wrecking and the disturbance voltage standard of GB17743-2007; The power factor of utilizing the PFC correcting unit to improve constant-current supply makes PF >=0.9, has effectively reduced current harmonics, makes power supply meet the Electro Magnetic Compatibility standard of GB17625.1; Improved conversion efficiency, η >=90%, conversion efficiency improves, and has reduced the components and parts temperature rise, thereby has improved useful life; Constant current output, line regulation are less than ± 5%, and load regulation is less than ± 3%, thereby it is more stable that LED is worked; Output current value rate of change when using the LED load testing to test with the electronic load that is equal to the LED load improves the operating efficiency when testing less than ± 3%, and homogeneity of product is higher.
Description of drawings
Fig. 1 is the modular structure figure of the utility model.
Fig. 2 is the circuit diagram of the utility model.
Fig. 3 is the fundamental diagram of prior art LED driving power.
Embodiment
Referring to Fig. 1,2.
Present embodiment comprises following part:
101: power input;
102: the EMI filter unit that links to each other with power input;
103: the rectification filtering unit that links to each other with the EMI filter unit;
104: the PFC correcting unit that links to each other with rectification filtering unit, and be connected to output unit;
105: the PWM constant current control unit that links to each other with the PFC correcting unit, said PWM constant current control unit generation control signal is connected to Buck converting unit 107, and storage and output that the Buck unit carries out energy according to its conducting and shutoff control are connected to output unit; In the present embodiment, the IC that PWM constant current control unit adopts is commercially available HV9910, and perhaps commercially available Chengdu becomes the electric silicon sea GK6010 of scientific & technical corporation chip, is tied to form ripe prior art, and its internal structure repeats no more.
106: one the current feedback unit that are connected with PWM constant current control unit with output unit 108, current feedback unit are gathered the signal of output unit and are produced and feed back signal to PWM constant current control unit; PWM constant current control unit is controlled said Buck converting unit periodically conducting and shutoff according to said feedback signal adjustment control signal, realizes the constant output of Buck switching energy;
PWM constant current control unit is also gathered the current signal of Buck converting unit, and according to the signal adjustment control signal that collects.
Compared with prior art; The non-isolation high power factor of the utility model LED constant-current driving power supply is through the current signal of collection Buck converting unit and the feedback signal of feedback unit feedback, and PWM constant current control unit is according to received signal, with adjustment Buck converting unit conducting and shutoff; Thereby the output of constant current; Realization makes load LED work more stable, when in the scope of AC-input voltage 170V～260V, changing to the LED current controlling; The variation of output current has improved line regulation less than ± 5%; Utilize the PFC correcting unit, the power factor (PF) that makes power supply is greater than more than 0.9, makes it to satisfy the restriction of AC harmonic of the following lighting apparatus of 25W of EN61000-3-2Class C defined.
Claims (1)
1. non-isolation high power factor LED constant-current driving power supply; It is characterized in that; Comprise EMI filter unit (102), rectification filtering unit (103), PFC correcting unit (104), PWM constant current control unit (105), current feedback unit (106), BUCK converting unit (107) and output unit (108); EMI filter unit (102), rectification filtering unit (103), PFC correcting unit (104) and in sequential series connection of output unit (108); The output of PFC output unit (104) is also connected to PWM constant current control unit (105); BUCK converting unit (107) connects output unit (108) and PWM constant current control unit (105), and output unit (108) also connects PWM constant current control unit (105) through current feedback unit (106).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205371993U CN202435663U (en) | 2011-12-20 | 2011-12-20 | Non-isolated LED constant-current driving power source with high power factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205371993U CN202435663U (en) | 2011-12-20 | 2011-12-20 | Non-isolated LED constant-current driving power source with high power factor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202435663U true CN202435663U (en) | 2012-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205371993U Expired - Fee Related CN202435663U (en) | 2011-12-20 | 2011-12-20 | Non-isolated LED constant-current driving power source with high power factor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202435663U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103619093A (en) * | 2013-10-29 | 2014-03-05 | 汤志新 | A LED integrated light source |
| CN106211480A (en) * | 2016-08-31 | 2016-12-07 | 合肥学院 | A kind of non-isolated buck high-power LED driving power source |
-
2011
- 2011-12-20 CN CN2011205371993U patent/CN202435663U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103619093A (en) * | 2013-10-29 | 2014-03-05 | 汤志新 | A LED integrated light source |
| CN106211480A (en) * | 2016-08-31 | 2016-12-07 | 合肥学院 | A kind of non-isolated buck high-power LED driving power source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120912 Termination date: 20151220 |
|
| EXPY | Termination of patent right or utility model |