CN202310221U - Constant-current drive circuit of LED (Light Emitting Diode) fluorescent light - Google Patents
Constant-current drive circuit of LED (Light Emitting Diode) fluorescent light Download PDFInfo
- Publication number
- CN202310221U CN202310221U CN2011204221857U CN201120422185U CN202310221U CN 202310221 U CN202310221 U CN 202310221U CN 2011204221857 U CN2011204221857 U CN 2011204221857U CN 201120422185 U CN201120422185 U CN 201120422185U CN 202310221 U CN202310221 U CN 202310221U
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- constant
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- led
- control chip
- current
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Abstract
The utility model discloses a constant-current drive circuit of an LED (Light Emitting Diode) fluorescent light. The constant-current drive circuit of the LED fluorescent light comprises a terminal which is externally connected with an alternating-current power supply, an EMC (Electro Magnetic Compatibility) filter circuit and a constant-current control chip, wherein the terminal is connected to the EMC filter circuit after being sequentially connected with fuses and an anti-lightning resistor through leads, the EMC filter circuit is connected to the constant-current control chip after sequentially passing through a rectifier circuit, a power correction circuit, a starting resistor, a feedforward voltage compensation circuit and a constant-current compensation circuit, and the constant-current control chip is sequentially and externally connected with an LED light through an MOS (Metal Oxide Semiconductor) transistor, a ballast inductor and an FWD (Fly-Wheel Diode). The constant-current drive circuit of the LED (Light Emitting Diode) fluorescent light, disclosed by the utility model, has a reasonable structure, has the advantages of over-voltage protection, over-temperature protection, short-circuit protection, lightning stroke resistance and the like, is accordant with the requirements of EMC and safety, has the characteristics of high power factor, high-efficiency constant-current output and the like, and is an optimal selection for driving the LED fluorescent light.
Description
Technical field
The utility model relates to a kind of constant-current LED fluorescent lamp drive circuit.
Background technology
Along with the appearance of LED white light, illuminating industry has started the Second Revolution, and LED is as light source, and not only energy-conserving and environment-protective but also long service life meet the low carbon products of environmental protection and energy saving that country advocates.But (promptly forward voltage) is different because the VF value of the LED that produces of LED production firm; And the electric current of the brightness of LED and LED is linear proportional relation; Require the electric current unanimity can guarantee that just the brightness of each LED is consistent with colourity, so be exactly a kind of trend with the constant-current supply driving LED.
The utility model content
The purpose of the utility model provides complete, the anti-thunderbolt of a kind of protective circuit, power factor is high, power-efficient is high constant current fluorescent lamp drive circuit.
The technical scheme of the utility model is following:
A kind of constant-current LED fluorescent lamp drive circuit; Include terminals, EMC filter circuit and the constant current control chip of external AC power supply; It is characterized in that: described terminals insert the EMC filter circuit after connecing fuse successively and resist thunderbolt resistance through lead; Through inserting the constant current control chip behind rectification circuit, power factor correction circuit, starting resistance, front feedback voltage compensation circuit and the constant current compensating circuit, described constant current control chip is successively through metal-oxide-semiconductor, ballast inductance and the external LED lamp of fly-wheel diode successively for said EMC filter circuit.
Described constant-current LED fluorescent lamp drive circuit is characterized in that: described constant current control chip is circumscribed with FM circuit.
The beneficial effect of the utility model:
The utility model circuit structure is reasonable, has advantages such as overvoltage protection, overheat protector, short-circuit protection, anti-thunderbolt, and meet EMC and safety requirement, and have characteristics such as High Power Factor, high-efficiency constant-current output, be the optimal selection that the LED fluorescent lamp drives.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Referring to Fig. 1; A kind of constant-current LED fluorescent lamp drive circuit; Include terminals, EMC filter circuit and the constant current control chip BP2808 of external AC power supply; Terminals insert the EMC filter circuit after connecing fuse successively and resist thunderbolt resistance through lead; Through inserting constant current control chip BP2808 behind rectification circuit, power factor correction circuit, starting resistance, front feedback voltage compensation circuit and the constant current compensating circuit, constant current control chip BP2808 is successively through metal-oxide-semiconductor, ballast inductance and the external LED lamp of fly-wheel diode successively for the EMC filter circuit.
Further, constant current control chip BP2808 is circumscribed with FM circuit, i.e. the TOFF circuit; Set the turn-off time of metal-oxide-semiconductor; Wherein the turn-off time has been controlled ripple current, and is relatively stable for the voltage of the fixing LED of series connection, if inductance is fixing; Output current is also just constant so, but peak electricity fails to be convened for lack of a quorum and raises along with the rising of input voltage.
Claims (2)
1. constant-current LED fluorescent lamp drive circuit; Include terminals, EMC filter circuit and the constant current control chip of external AC power supply; It is characterized in that: described terminals insert the EMC filter circuit after connecing fuse successively and resist thunderbolt resistance through lead; Through inserting the constant current control chip behind rectification circuit, power factor correction circuit, starting resistance, front feedback voltage compensation circuit and the constant current compensating circuit, described constant current control chip is successively through metal-oxide-semiconductor, ballast inductance and the external LED lamp of fly-wheel diode successively for said EMC filter circuit.
2. constant-current LED fluorescent lamp drive circuit according to claim 1 is characterized in that: described constant current control chip is circumscribed with FM circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204221857U CN202310221U (en) | 2011-10-31 | 2011-10-31 | Constant-current drive circuit of LED (Light Emitting Diode) fluorescent light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204221857U CN202310221U (en) | 2011-10-31 | 2011-10-31 | Constant-current drive circuit of LED (Light Emitting Diode) fluorescent light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202310221U true CN202310221U (en) | 2012-07-04 |
Family
ID=46379027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204221857U Expired - Fee Related CN202310221U (en) | 2011-10-31 | 2011-10-31 | Constant-current drive circuit of LED (Light Emitting Diode) fluorescent light |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202310221U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102917504A (en) * | 2012-10-29 | 2013-02-06 | 广东锦力电器有限公司 | Led drive circuit |
-
2011
- 2011-10-31 CN CN2011204221857U patent/CN202310221U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102917504A (en) * | 2012-10-29 | 2013-02-06 | 广东锦力电器有限公司 | Led drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20131031 |