CN201813587U - Universal lighting LED driving circuit - Google Patents
Universal lighting LED driving circuit Download PDFInfo
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- CN201813587U CN201813587U CN2010201546744U CN201020154674U CN201813587U CN 201813587 U CN201813587 U CN 201813587U CN 2010201546744 U CN2010201546744 U CN 2010201546744U CN 201020154674 U CN201020154674 U CN 201020154674U CN 201813587 U CN201813587 U CN 201813587U
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Abstract
The utility model overcomes the deficiency of the existing LED driving circuit, and provides a high-performance universal lighting LED driving circuit which has power factor correction function, dimming function, EMI (Electro-Magnetic Interference) filtering function and other functions, wherein the power factor is higher than 0.9, and the system efficiency is higher than 91 percent in a full load condition. The technical scheme is as follows: the universal lighting LED driving circuit comprises a rectifying circuit, a power factor correction (PFC) circuit, an EMI filtering circuit and a dimming circuit. The universal lighting LED driving circuit adopts an MH808 chip as the core, has high performance, and simultaneously realizes the characteristics of PFC (Power Factor Correction), EMI, constant current and dimming, thus indeed enabling LED lighting equipments to be green, energy-saving and environment-friendly.
Description
Technical field:
The utility model belongs to electronic technology field, relates to general illumination LED drive circuit
Technical background:
The LED lighting is as the cold light source product, characteristics such as have that cost performance is higher, environmental protection, safe and reliable, steady quality, long service life, installation and maintenance are easy can be widely used in greenery patches illumination, highway lighting, advertising lamp box illumination, city moulding Landscape Lighting and lighting of home system.Be to one of the high-tech sector of tool development prospect of century, become the leading of illumination market replacing incandescent lamp and fluorescent lamp.Under LED Lighting Industry bright prospect like this, at the different application of lighting field, also in development rapidly, it mostly adopts switch power technology to various LED lamp drive circuits.But, present many led drive circuits do not have Active PFC (PFC) function or do not consider electromagnetic interference (EMI), Switching Power Supply is a very strong harassing and wrecking source, high frequency break-make and output rectifier diode that it derives from switching device oppositely recover, and very strong electromagnetic disturbance signal disturbs contiguous sensitive equipment by the conduction of space radiation and power line.Except power switch pipe and high-frequency rectification diode, the main components and parts that produce radiated interference also have pulse transformer and filter inductance etc.
It is relatively easy to suppress conducted interference, as long as use suitable electromagnetic interface filter, just its EMI signal level on power line can be suppressed in the limit value of correlation standard.Make electromagnetic interface filter best fade performance be arranged to the EMI signal, then filter impedance should with the source impedance mismatch, mismatch is severe more, the decay of realization is unreasonable to be thought, the insertion loss characteristic that obtains is just good more.
Switching Power Supply exists common mode disturbances and differential mode interference simultaneously, and common mode disturbances is main, must make the resonance frequency of common mode filtering circuit and differential mode filter circuit be starkly lower than the operating frequency of Switching Power Supply during design.
The utility model content:
The utility model overcomes the deficiency of existing led drive circuit, a kind of high performance universal illumination LED drive circuit is provided, this circuit has functions such as Active PFC function, dimming function, EMI filtering, and power factor is greater than 0.9, and system effectiveness is greater than 91% under the full load conditions.
Technical solutions of the utility model comprise: rectification circuit, power factor (PFC) correcting circuit, the EMI filter circuit, light adjusting circuit, the utility model is a core with the MH808 chip, high energy has solved power factor correction PFC, EMI, constant current, dimming characteristic simultaneously, makes the LED electric lighting really accomplish green, energy-saving and environmental protection.
For achieving the above object, the utility model patent provides the detailed technology scheme as follows:
The EMI filter circuit is made up of capacitor C 1, capacitor C 2, resistance R 1, resistance R 2, inductance L 1, inductance L 2, and capacitor C 1, capacitor C 2 are used to carry out differential mode filtering.
Power factor (PFC) correcting circuit is made of diode VD2, diode VD3, diode VD4, diode VD5 and capacitor C 3, capacitor C 4, resistance R 3, inductance L 3, this circuit is proofreaied and correct input current to a certain extent, can effectively improve power factor.Resistance R 3 can effectively suppress surge current and peak voltage, and diode VD5 adopts fast recovery diode, inductance L 3 to be beneficial to minimizing EMI conduction as energy-storage travelling wave tube.
Constant Current Control System is by the MH808 chip, and MOSFET manages Q1, inductance L 4, quick conducting diode VD5, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, bidirectional diode VD6.As sampling resistor start and feedforward compensation resistance be respectively resistance R 7, resistance R 8, resistance R 6 is set switching time, sampling resistor is resistance R 4, resistance R 5.The size of R6 realizes the work period of MOSFET.Its computational methods are: t=4 * 10
-5* (R6) set the turn-off time to have controlled the current floating scope with this.The electric current of led circuit decides according to the peak current of inductance L 4 and the turn-off time of MOSFET, pass through the sampling of resistance R 4, resistance R 5 simultaneously, come the variation of the reference voltage and the MH808 chip power supply voltage of decision circuitry, reference voltage is adjusted in variation according to MH808 chip power supply voltage, improves power consumption efficiency.
Alternating current is through fuse F; fuse F gives circuit with effective protection when big surge current; carry out differential mode filtering through capacitor C 1, capacitor C 2; capacitor C 1, capacitor C 2 can be filtered low frequency signal; through common mode inductance L1, inductance L 2 the High-frequency Interference source is reflected back; thereby disturb majority to filter out low-and high-frequency, resistance R 1, resistance R 2 are as the energy bleeder resistance of inductance L 1, inductance L 2.The electric current of process filtering is after the full-wave rectification of rectifier bridge, become the comparatively direct current of graduation, electric current is through VD1, ingoing power factor (PFC) correcting circuit, output pin 1 ground connection of while rectifier bridge, when alternating voltage was higher than capacitor C 1, capacitor C 2 voltages, electric current was directly to electric, when less than capacitor C 1, capacitor C 2 voltages, capacitor C 1, capacitor C 2 are carried out parallel discharge.Here the specification of capacitor C 1, capacitor C 2 is the same.The ceiling voltage at electric capacity two ends because connecting, capacitor C 1, capacitor C 2 dashes electricity, so must leave certain crest amount of redundancy.
In sum, insulation type general use illumination LED driving circuit described in the utility model has rate factor correcting PFC, EMI, constant current, dimming characteristic.The utility model is owing to adopted the MH808 chip simultaneously; can save a large amount of peripheral circuits, overheat protector, output LED short-circuit protection and output LED open-circuit-protection are fit to system effectiveness and require the good requirement of high stability very much simultaneously; the advantage that its cost is low, volume is little simultaneously is fit to produce in batches.
Description of drawings:
Accompanying drawing 1, the utility model circuit theory diagrams
Execution mode:
Be further described below in conjunction with 1 pair of the utility model patent of accompanying drawing, the most preferred embodiment of the utility model patent is:
AC power one end connects fuse F, be connected in first capacitor C 1, resistance R 1 and inductance L 1 through the fuse F other end, the AC power other end connects and first capacitor C 1, resistance R 2 and inductance L 2, the other end of resistance R 1 and inductance L 1 is connected and capacitor C 2, the other end of resistance R 2 and inductance L 2 is connected the other end with capacitor C 2, has more than constituted the EMI filter circuit.
Is connected D1 pin 2 with rectifier bridge jointly by an end of capacitor C 2, resistance R 1 and inductance L 1, by the D1 pin 3 of the other end rectifier bridge of capacitor C 2, resistance R 2 and inductance L 2, the D1 that passes through rectifier bridge obtains the full-wave rectification electric current.
Pin 3 through rectifier bridge D1 connects diode VD1, the pin 1 of rectifier bridge D1 connects diode VD2, capacitor C 4, capacitor C 6, capacitor C 7, capacitor C 8, inductance L 3, resistance R 4, resistance R 5, resistance R 6, MH808 pin of chip GND earth terminal, both-end diode VD6, simultaneously pin 1 ground connection of rectifier bridge D1.Diode VD1 connects the positive pole of capacitor C 3, capacitor C 5, capacitor C 6, inductance L 3, quick conducting diode VD5 and LED lamp group.Constitute power factor (PFC) correcting circuit by diode VD2, diode VD3, diode VD4, diode VD5 and capacitor C 3, capacitor C 4, resistance R 3, inductance L 3.
MH808 pin of chip CS connects the other end of resistance R 4, resistance R 5, MH808 pin of chip GND ground connection, MH808 pin of chip RT connects resistance R 6, MH808 pin of chip LN connects the other end of resistance R 7 and capacitor C 7, MH808 pin of chip VDD connects the other end of the both-end diode VD6 other end with the G utmost point of, MOSFET, resistance R 7, resistance R 8, capacitor C 8, MH808 pin of chip OUT connects the S utmost point of MOSFET, and MH808 pin of chip DIM connects pwm signal and carries out light modulation.The D utmost point of MOSFET connects inductance L 4, quick conducting diode VD5.
The negative pole of the other end connection LED lamp group of inductance L 4 and resistance R 8, capacitor C 5.
The embodiment of the above only is preferred embodiment of the present utility model, and non-once limits practical range of the present utility model, so the variation that all shapes with the utility model, principle are done all is covered by within the protection range of the present utility model.
Claims (5)
1. general illumination LED drive circuit, it is characterized in that comprising: rectification circuit, power factor (PFC) correcting circuit, the EMI filter circuit, light adjusting circuit, the present invention is a core with the MH808 chip, high energy, solved power factor correction PFC, EMI, constant current, dimming characteristic simultaneously, made the LED electric lighting really accomplish green, energy-saving and environmental protection.
2. a kind of general illumination LED drive circuit according to claim 1 is characterized in that the EMI filter circuit is made up of capacitor C 1, capacitor C 2, resistance R 1, resistance R 2, inductance L 1, inductance L 2, and capacitor C 1, capacitor C 2 are used to carry out differential mode filtering.
3. a kind of general illumination LED drive circuit according to claim 1, it is characterized in that power factor (PFC) correcting circuit is made of diode VD2, diode VD3, diode VD4, diode VD5 and capacitor C 3, capacitor C 4, resistance R 3, inductance L 3, this circuit is proofreaied and correct input current to a certain extent, can effectively improve power factor, resistance R 3 can effectively suppress surge current and peak voltage, and diode VD5 adopts fast recovery diode, inductance L 3 to be beneficial to minimizing EMI conduction as energy-storage travelling wave tube.
4. a kind of general illumination LED drive circuit according to claim 1, it is characterized in that Constant Current Control System is by the MH808 chip, MOSFET manages Q1, inductance L 4, quick conducting diode VD5, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, bidirectional diode VD6, as sampling resistor startup and feedforward compensation resistance is respectively resistance R 7, resistance R 8, resistance R 6 is set switching time, sampling resistor is resistance R 4, resistance R 5, the size of R6 realizes the work period of MOSFET, and its computational methods are: t=4 * 10
-5* (R6) set the turn-off time to have controlled the current floating scope with this, the electric current of led circuit decides according to the peak current of inductance L 4 and the turn-off time of MOSFET, pass through the sampling of resistance R 4, resistance R 5 simultaneously, come the variation of the reference voltage and the MH808 chip power supply voltage of decision circuitry, reference voltage is adjusted in variation according to MH808 chip power supply voltage, improves power consumption efficiency.
5. a kind of general illumination LED drive circuit according to claim 1; it is characterized in that alternating current is through fuse F; fuse F gives circuit with effective protection when big surge current; through capacitor C 1; capacitor C 2 is carried out differential mode filtering; capacitor C 1; capacitor C 2 can be filtered low frequency signal; through common mode inductance L1; inductance L 2 reflects back the High-frequency Interference source; thereby disturb majority to filter out low-and high-frequency; resistance R 1; resistance R 2 is as inductance L 1; the energy bleeder resistance of inductance L 2; the electric current of process filtering is after the full-wave rectification of rectifier bridge; become the comparatively direct current of graduation; electric current is through VD1; ingoing power factor (PFC) correcting circuit; output pin 1 ground connection of while rectifier bridge; when alternating voltage is higher than capacitor C 1; during capacitor C 2 voltages; electric current is directly to electric; when less than capacitor C 1; capacitor C 2 voltages; capacitor C 1; capacitor C 2 is carried out parallel discharge; here capacitor C 1; the specification of capacitor C 2 is the same; because capacitor C 1; capacitor C 2 is connected and is dashed electricity, so the ceiling voltage at electric capacity two ends must leave certain crest amount of redundancy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201546744U CN201813587U (en) | 2010-03-21 | 2010-03-21 | Universal lighting LED driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201546744U CN201813587U (en) | 2010-03-21 | 2010-03-21 | Universal lighting LED driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201813587U true CN201813587U (en) | 2011-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201546744U Expired - Fee Related CN201813587U (en) | 2010-03-21 | 2010-03-21 | Universal lighting LED driving circuit |
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| CN (1) | CN201813587U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857128A (en) * | 2011-06-30 | 2013-01-02 | 海洋王照明科技股份有限公司 | AC (alternating-current) and DC (direct-current) conversion circuit |
| WO2016112538A1 (en) * | 2015-01-16 | 2016-07-21 | 邓树兴 | Electronic substitution-type double-end straight-tube led lamp and safety protection circuit thereof |
| CN109001588A (en) * | 2017-06-06 | 2018-12-14 | 福特全球技术公司 | Vehicle fuse box fault detector |
| WO2019051769A1 (en) * | 2017-09-15 | 2019-03-21 | 深圳实现创新科技有限公司 | Universal double-ended led lamp tube and module thereof meeting safety standards |
-
2010
- 2010-03-21 CN CN2010201546744U patent/CN201813587U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857128A (en) * | 2011-06-30 | 2013-01-02 | 海洋王照明科技股份有限公司 | AC (alternating-current) and DC (direct-current) conversion circuit |
| CN102857128B (en) * | 2011-06-30 | 2015-10-28 | 海洋王照明科技股份有限公司 | AC/DC change-over circuit |
| WO2016112538A1 (en) * | 2015-01-16 | 2016-07-21 | 邓树兴 | Electronic substitution-type double-end straight-tube led lamp and safety protection circuit thereof |
| CN109001588A (en) * | 2017-06-06 | 2018-12-14 | 福特全球技术公司 | Vehicle fuse box fault detector |
| CN109001588B (en) * | 2017-06-06 | 2023-03-17 | 福特全球技术公司 | Vehicle fuse box fault indicator |
| WO2019051769A1 (en) * | 2017-09-15 | 2019-03-21 | 深圳实现创新科技有限公司 | Universal double-ended led lamp tube and module thereof meeting safety standards |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Foshan Nanhai Jinqiu Electronic Co., Ltd. Assignor: Jiang Junqi Contract record no.: 2012440000523 Denomination of utility model: General illumination LED drive circuit Granted publication date: 20110427 License type: Exclusive License Record date: 20120912 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110427 Termination date: 20130321 |